CN112600264B - Control method and system of parallel battery packs, electronic equipment and vehicle - Google Patents
Control method and system of parallel battery packs, electronic equipment and vehicle Download PDFInfo
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- CN112600264B CN112600264B CN202011378507.2A CN202011378507A CN112600264B CN 112600264 B CN112600264 B CN 112600264B CN 202011378507 A CN202011378507 A CN 202011378507A CN 112600264 B CN112600264 B CN 112600264B
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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
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0016—Circuits for equalisation of charge between batteries using shunting, discharge or bypass circuits
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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
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0019—Circuits for equalisation of charge between batteries using switched or multiplexed charge circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00302—Overcharge protection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00304—Overcurrent protection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00306—Overdischarge protection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00308—Overvoltage protection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00309—Overheat or overtemperature protection
Abstract
The invention provides a control method and system for parallel battery packs, electronic equipment and a vehicle, and belongs to the technical field of batteries. The method comprises the following steps: determining a main control unit corresponding to a battery management system of the parallel battery packs; feeding back branch detection data of a battery pack corresponding to the first battery management system to the main control unit; receiving a control instruction sent by the main control unit through a second battery management system, wherein the control instruction is determined by the main control unit through the branch detection data, and the first battery management system and the second battery management system are both determined as slave units; and adding or withdrawing the battery pack corresponding to the second battery management system into a main loop according to the control instruction, wherein the main loop comprises the parallel battery pack and load equipment, or the main loop comprises the parallel battery pack and charging equipment. The invention can be used for parallel connection of lithium battery packs.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a control method of parallel battery packs, a control system of parallel battery packs, electronic equipment and a vehicle.
Background
With the continuous improvement of living standard, hybrid or electric vehicles such as motor homes and mini-trucks are gradually being purchased due to the use requirements of people. As a vehicle mainly used in outdoor life or long-distance operation, a standby power supply is particularly important, for example, as a motor home, the demand of standby power consumption is more and more large, a lead-acid battery is difficult to meet the demand, and people begin to put attention to a lithium battery with higher energy density. A lithium Battery generally needs to be used in conjunction with a Battery Management System (BMS), and the Battery Management System can monitor parameters such as Battery voltage, temperature, and current, and perform protection according to the data, such as overcharge/overdischarge protection, high temperature/low temperature protection, and overcurrent protection. However, when the parallel connection of the lithium battery packs is attempted, due to the existence of the battery management system, the lithium battery packs cannot be directly connected in parallel by lines like a lead-acid battery, and it is difficult to connect a plurality of lithium battery packs in parallel, so a scheme for connecting a plurality of lithium battery packs in parallel is required.
Disclosure of Invention
The invention aims to provide a control method, a control system, electronic equipment and a vehicle for parallel battery packs, which are used for avoiding parallel use faults caused by independent control and protection of battery management systems of a plurality of lithium battery packs, and further improving the control compatibility and communication coordination of the lithium battery packs in a parallel system.
In order to achieve the above object, an embodiment of the present invention provides a control method for parallel battery packs, where the control method includes:
determining a master unit corresponding to a battery management system of parallel battery packs, wherein the battery management system which is not determined as the master unit is determined as a slave unit of the master unit;
feeding back branch detection data of a battery pack corresponding to a first battery management system to the main control unit, wherein the branch detection data comprises branch current of the battery pack corresponding to the first battery management system;
receiving a control instruction sent by the master control unit through a second battery management system, wherein the control instruction is determined by the master control unit through the branch detection data, and the first battery management system and the second battery management system are both determined as slave units;
and adding or withdrawing the battery pack corresponding to the second battery management system into a main loop according to the control instruction, wherein the main loop comprises the parallel battery pack and load equipment, or the main loop comprises the parallel battery pack and charging equipment.
Specifically, the determining the main control unit corresponding to the battery management system of the parallel battery pack includes:
determining a first communication address corresponding to a battery management system of any one of the parallel battery packs;
and if the second communication address is determined to be present before the first communication address, determining that the battery management system corresponding to the second communication address is the main control unit corresponding to the battery management system of the parallel battery pack, or,
and if any communication address sequenced before the sequencing of the first communication address does not exist, determining that the battery management system corresponding to the first communication address is the main control unit corresponding to the battery management system of the parallel battery pack.
Specifically, the main control unit corresponding to the battery management system of the parallel battery packs is determined, wherein,
the main control unit comprises an instruction processing system which is independent relative to any battery management system.
Specifically, the feeding back the branch detection data of the battery pack corresponding to the first battery management system to the main control unit includes:
determining a branch current of a battery pack corresponding to a first battery management system;
determining a first charging or discharging activation state of a battery pack corresponding to the first battery management system according to the current direction of the branch current;
feeding back branch detection data having the branch current and the first charge or discharge activation state to the main control unit.
Specifically, after feeding back the branch detection data of the battery pack corresponding to the first battery management system to the main control unit and before receiving the control instruction sent by the main control unit through the second battery management system, the method further includes:
determining an identification value corresponding to the current direction of the branch current in the branch detection data through a battery management system serving as the main control unit;
determining, by a battery management system as the master control unit, a control instruction corresponding to the identification value or a sum of the determined identification values.
Specifically, the second battery management system receives a control command sent by the main control unit, wherein,
the control instructions are for controlling the second battery management system to change a second charge or discharge activation state to a charge or discharge activation state that is the same as the first charge or discharge activation state,
the second charge or discharge activation state is a charge or discharge activation state of a battery pack corresponding to the second battery management system.
Specifically, the adding or exiting the battery pack corresponding to the second battery management system into or out of the main loop according to the control instruction includes:
controlling the second battery management system to actively switch the on-off state of the switch on the current branch to the on-off state of the switch added into the main loop according to the control instruction, wherein,
and the current branch is the branch where the battery pack corresponding to the second battery management system is located.
Specifically, the control method further includes:
determining branch detection data acquired by any battery management system to trigger a battery protection condition, wherein a battery pack to be isolated corresponding to the battery management system is in a charging or discharging activation state, and the branch detection data acquired by the battery management system includes voltage and/or branch current of the battery pack to be isolated;
and exiting the battery pack to be isolated out of the main loop through any one battery management system.
Specifically, the control method further includes:
receiving an isolation instruction sent by the main control unit through the remaining battery management systems, wherein the isolation instruction is determined by branch detection data acquired by the main control unit through any one battery management system, and the remaining battery management systems are battery management systems except any one battery management system in the battery management systems corresponding to the battery pack added into the main loop;
and according to the isolation instruction, the battery packs corresponding to the rest battery management systems exit the main loop.
The embodiment of the invention provides a control system for parallel battery packs, which comprises:
the system comprises a main control determining module, a battery management module and a battery management module, wherein the main control determining module is used for determining a main control unit corresponding to a battery management system of a parallel battery pack, and the battery management system which is not determined as the main control unit is determined as a slave unit of the main control unit;
the data feedback module is used for feeding back branch detection data of a battery pack corresponding to a first battery management system to the main control unit, wherein the branch detection data comprises a branch current of the battery pack corresponding to the first battery management system;
the data receiving module is used for receiving a control instruction sent by the main control unit through a second battery management system, wherein the control instruction is determined by the main control unit through the branch detection data, and the first battery management system and the second battery management system are both determined as slave units;
and the execution module is used for adding or withdrawing the battery pack corresponding to the second battery management system into or from a main loop according to the control instruction, wherein the main loop comprises the parallel battery pack and load equipment, or the main loop comprises the parallel battery pack and charging equipment.
In another aspect, an embodiment of the present invention provides an electronic device, including:
at least one processor;
a memory coupled to the at least one processor;
wherein the memory stores instructions executable by the at least one processor, the at least one processor implements the aforementioned method by executing the instructions stored by the memory.
In another aspect, an embodiment of the present invention provides a vehicle, where the vehicle has the foregoing electronic device.
The invention can coordinate the battery management system which is not added with the main loop to carry out parallel operation by feeding back branch detection data to the determined main control unit, so that a plurality of lithium battery packs are simultaneously added into the main loop, the balanced charging process of the plurality of lithium battery packs is realized, and the invention has the characteristics of control compatibility, communication coordination and the like; furthermore, the multiple lithium battery packs are independently isolated and protected, so that when a battery pack exits from the main loop due to protection activation such as overcharge and overdischarge, the remaining battery management system can be coordinated to exit from the main loop; the invention can be realized by software, does not need more hardware design and change, and is easy to deploy and implement.
Additional features and advantages of embodiments of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments of the invention without limiting the embodiments of the invention. In the drawings:
FIG. 1 is a schematic flow chart of a main method according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a circuit module in use with an exemplary single cell pack;
FIG. 3 is a schematic diagram of circuit blocks for use with exemplary multi-cell packets in direct parallel;
FIG. 4 is a schematic diagram of a parallel system of exemplary multi-cell packets in accordance with an embodiment of the present invention;
FIG. 5 is a schematic diagram of a parallel system of exemplary multi-cell packets in accordance with an embodiment of the present invention;
fig. 6 is a schematic diagram of an exemplary charging or discharging activation state determination process according to an embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating embodiments of the invention, are given by way of illustration and explanation only, not limitation.
Example 1
The embodiment of the invention provides a control method of parallel battery packs, which comprises the following steps:
s1) determining a master unit corresponding to the battery management systems of the parallel battery packs, wherein the battery management systems that are not determined as the master unit are determined as slave units of the master unit;
s2) feeding back branch detection data of a battery pack corresponding to a first battery management system to the main control unit, where the branch detection data includes a branch current of the battery pack corresponding to the first battery management system, and the first battery management system may be one or more battery management systems;
s3) receiving a control command sent by the master control unit through a second battery management system, where the control command is determined by the master control unit through the branch detection data, the first battery management system and the second battery management system are both determined as the slave units, the second battery management system may be one or more battery management systems, and the first battery management system and the second battery management system both belong to the battery management systems of the parallel battery packs;
s4) adding or exiting the battery pack corresponding to the second battery management system into a main loop according to the control instruction, wherein the main loop comprises the parallel battery pack and load equipment, or the main loop comprises the parallel battery pack and charging equipment.
In some embodiments, the parallel connection system further includes a parallel connection battery pack, a charging device and a load device, where the parallel connection battery pack and the charging device, or the parallel connection battery pack and the load device, may form a main loop, the parallel connection battery pack includes at least two battery packs, the battery pack may be a lithium battery pack, such as a lithium iron phosphate battery pack, the battery pack may include a battery module and a switch connected in series, the battery module and the switch may be in a branch of the parallel connection system, the switch includes a charging switch and a discharging switch, the battery module, the discharging switch and the charging switch may be connected in series on the branch in sequence, the discharging switch is further connected in parallel with one diode (not called as a first trigger diode) and an anode of the first trigger diode is connected with a cathode of the battery module, the charging switch is further connected in parallel with another diode (not called as a second trigger diode) and a cathode of the second trigger diode is connected with the first trigger diode The battery management system is connected with the battery module and can be used for monitoring various parameters such as the voltage and the charge state of the battery module, the battery management system is also used for acquiring branch current detection data of the branch and controlling the on-off state (the off state or the on state) of a charging switch and a discharging switch when any trigger diode is triggered to be switched on so as to enable the branch to be added into or withdrawn from a main loop, the battery management system can be realized by an instruction processing system, such as a battery protection circuit board (a protection board for short) with a single-chip Microcomputer (MCU), the battery management system can be configured with a judgment instruction corresponding to the battery protection condition, and whether the branch detection data such as the voltage and the current of the battery pack triggers the battery protection or not can be determined by the judgment instruction And (4) protecting the conditions.
As shown in fig. 2, when the battery pack is used alone, after the voltage or current (i.e. branch current) of the battery pack triggers the battery protection conditions such as battery overcharge, charging overcurrent, high or low charging temperature, etc., the charging switch may be turned off, the discharging switch may be turned on, and the current direction may be limited by the second trigger diode, so that the charging may not be continued; after the battery protection conditions such as over-discharge, over-current discharge, high-temperature or low-temperature discharge and the like of the trigger battery are met, the charging switch is closed, and the discharging switch is opened, so that the current direction is limited by the first trigger diode and the discharging is not continued.
As shown in fig. 3, when a plurality of battery packs are used in parallel, because there is no communication between the battery packs, if all the battery packs trigger the over-discharge protection, the charging still needs to be performed according to the control steps when the single (battery) pack is used, but because any one trigger diode needs a certain voltage difference for conduction, and the parallel connection cannot ensure that the corresponding diodes in the plurality of battery packs are conducted at the same time, it is difficult to simultaneously add all the battery packs into the main loop, i.e., it is difficult to simultaneously put all the battery packs into use, which causes unbalanced battery charging distribution, and there is a situation that the single pack bears the current of the whole parallel system, and it is likely that the charging over-current protection will be directly triggered, so that any one battery pack cannot be used.
In the embodiment of the present invention, as shown in fig. 4, the main control unit corresponding to the battery management system of the parallel battery pack may be determined first, where the states of the branches where the battery modules and the switches are located in the parallel battery pack may be that the main circuit is already added, the main circuit is not yet added, or the main circuit is exited after the addition. When the battery management systems are used in parallel, communication addresses (namely, communication addresses of the battery management systems) of the protection boards corresponding to the plurality of battery packs CAN include an address 1, an address 2, an address 3 and the like; the method comprises the steps that a first communication address corresponding to a battery management system in a parallel battery pack can be determined on any battery management system; and if the battery management system corresponding to the second communication address is determined to be the main control unit corresponding to the battery management system of the parallel battery pack, or if any communication address sequenced before the sequencing of the first communication address is determined not to exist, the battery management system corresponding to the first communication address is determined to be the main control unit corresponding to the battery management system of the parallel battery pack. In some cases, there may be one or more communication addresses according to the battery management system existing in the actual situation before the communication address of the current battery management system is sorted, when there are multiple communication addresses, the communication address at the top of the order may be taken and the battery management system corresponding to the top communication address may be determined as the master control unit, thereby, the battery management systems which are not successfully communicated in actual situations, such as communication faults or battery faults, may be sequentially eliminated, the determined master control unit is responsible for receiving feedback data and issuing instructions to each battery management system, for example, the protection board with address 1 serves as the host, the remaining protection boards send the collected data to the protection board with address 1, the data is processed by the protection board 1, if the protection board with address 1 fails to communicate, the protection board with address 2 serves as the host, and so on.
In some cases, as shown in fig. 5, the main control unit may include an instruction processing system independent from any battery management system, such as a separately configured industrial control board, a controller, a server, a touch screen or a central control screen with an instruction processing system, or a central control system, and the like, and for example, the main control unit may be implemented on a charging device, and the charging device may have an instruction processing system, and the instruction processing system may be configured for the aforementioned main control unit, and may perform serial port communication or local area network communication with any battery management system.
The method can select how to obtain branch detection data such as current and voltage according to a detection structure of a specific parallel system, for example, the main control unit can detect the current on each branch in the parallel system, the main control unit can also receive the branch detection data fed back by the battery management system on each branch, and the feedback operation can be performed according to the characteristics of the detection circuit on the used protection board, and the current detection circuit can be passively and directly fed back to a current detection interface of the main control unit or a digital logic circuit or a chip for detecting the current to actively perform timing feedback.
As shown in fig. 6, the main control unit may sum and process the current in the branch detection data, obtain a charging current direction as positive (e.g. note identification value +1), a discharging current direction as negative (e.g. note identification value-1), and a current magnitude as 0 (e.g. note identification value 0), the main control unit may receive the current detection data, determine whether the current magnitude is 0, determine whether the current direction is the current direction of the charging current, determine whether the current direction is the current direction of the discharging current, record each identification value, then calculate the sum of the identification values, and may determine the charging or discharging activation state of the parallel system according to the sum of the identification values; for example, if a battery pack with a conducting loop exists in the parallel system and only one battery pack conducting loop exists, the battery pack may be considered to be in a charging or discharging activated state, at this time, the main control unit may determine an identification value (which may be recorded in correspondence with the protection board identification identifier or in correspondence with the communication address) according to a branch current direction in the branch detection data, for example, the sum of the identification values may be +1 (as shown in fig. 4, three branches may be +1, -1, +1, or +1, -0, or 0, and 0 may represent that a current is zero), obtain that the current state of the parallel system is the charging activated state, further determine a control instruction corresponding to the branch detection data through the main control unit, and issue the control instruction to each battery pack not in the charging activated state; correspondingly, if a battery pack of a conducting loop exists in the parallel system and only one battery pack conducting loop exists, the battery pack can be regarded as being in a charging or discharging activation state, at the moment, the main control unit can determine an identification value according to the branch current direction in the branch detection data, if the sum of the identification values is-1, the current state of the parallel system is a discharging activation state, further, a control instruction corresponding to the branch detection data can be determined through the main control unit, and the control instruction is issued to each battery pack which is not in the discharging activation state; in some practical cases.
The switch regarded as the battery pack in the charging activated state may not be controlled to be closed by the battery management system of the switch but to be added to the main loop, and the diode may be turned on to form a conductive loop, so that the issued control command may also be simultaneously sent to the battery pack regarded as the battery pack in the charging activated state, so that all the battery packs in the parallel system may be simultaneously added to the main loop, that is, the slave unit obeys the control of the master unit and is added to the main loop in parallel, the first battery management system may correspond to the battery pack in which the conductive loop exists, and the second battery management system may correspond to the battery pack in which the conductive loop does not exist or to the battery pack not in the charging or discharging activated state (i.e., the charging activated state or the discharging activated state).
In still other practical operations, after the charging device is connected, the main control unit determines that the current state of the parallel system is a charging activation state, and after the battery management system with the conduction loop feeds back branch detection data, a control instruction corresponding to the charging activation state can be issued to each battery management system, so that all battery packs are added into the main loop by the respective battery management systems; correspondingly, after the load device is connected, the main control unit determines that the current state of the parallel system is a discharge activation state, and after the battery management system with the conduction loop feeds back branch detection data, a control instruction corresponding to the discharge activation state can be sent to each battery management system, so that all battery packs are added into the main loop by the respective battery management systems; it is required to provide that, under the condition of normal full charge or discharge, any battery management system can operate the charge switch and the discharge switch due to full charge or discharge of the battery pack, and feed back the current full charge or discharge state of the battery pack to the main control unit, and the main control unit can also issue a control instruction to other battery management systems in a similar manner, so as to realize that all the battery management systems exit the main loop.
The master unit or slave unit (which may have been activated at this time) may be configured or selected for use in accordance with specific usage scenarios, such as processor computational performance, overhead of instruction execution: determining a branch current of a battery pack corresponding to a first battery management system; and determining a first charging or discharging activation state of the battery pack corresponding to the first battery management system according to the current direction of the branch current. The battery management system as a slave unit may feed back branch circuit detection data having the branch circuit current and the first charge or discharge activation state to the master unit.
The aforementioned control instruction may be used to control the second battery management system to change a second charging or discharging activation state to a charging or discharging activation state that is the same as the first charging or discharging activation state, where the second charging or discharging activation state is a charging or discharging activation state of a battery pack corresponding to the second battery management system. Specifically, according to the control instruction, the second battery management system is controlled to actively (with respect to the fact that the diode is triggered to be conducted) switch the on-off state of the switch on the current branch to the on-off state of the main loop, where the current branch is a branch where the battery pack corresponding to the second battery management system is located, for example, the main control unit obtains information that the parallel system is charging, and sends the charging control instruction to other battery packs, and after receiving the control instruction, the other battery packs close the discharge switches, so that all the battery packs are added to the main loop, and all the battery packs are put into use, and the purpose of simultaneous activation can be achieved.
In some implementations, when the aforementioned battery management systems are in any one of the activated states, that is, the protection board is activated, the current direction of each battery pack can be determined independently at this time, so that the battery management system can obtain the current activated state, specifically the charging activated state, or specifically the discharging activated state, according to the current direction.
After the protection plates are activated or when each battery pack is in a state of being connected to the main loop, each battery management system can separately perform protection monitoring on the corresponding battery pack, and determine that branch detection data acquired by any one battery management system triggers a battery protection condition, wherein the battery pack to be isolated corresponding to any one battery management system is in a charging or discharging activation state, and the branch detection data acquired by any one battery management system includes the voltage and/or the branch current of the battery pack to be isolated; and exiting the battery pack to be isolated out of the main loop through any one battery management system. If the battery management system detects that a single battery pack is discharged and overflows, the battery pack corresponding to the battery management system exits the main loop, the battery management system detects that the single battery pack is overvoltage/undervoltage, the battery pack corresponding to the battery management system exits the main loop, if the battery pack corresponding to each battery management system exits the main loop because of triggering a battery protection condition, when a control instruction for adding the main loop into the main control unit is received, the control instruction can be configured to be ignored or temporarily ignored, and fault state information can be optionally fed back to the main control unit.
In some cases, all the remaining battery packs can be selectively and actively isolated and protected according to the fault type of the isolated battery pack, so that further damage to more battery packs caused by serious faults of ultrahigh temperature or large current and the like can be avoided. Specifically, the isolation instruction sent by the main control unit is received by the remaining battery management systems, wherein the isolation instruction is determined by the branch detection data acquired by the main control unit through any one of the battery management systems, and the remaining battery management systems are battery management systems other than any one of the battery management systems in the battery management systems corresponding to the battery pack added to the main loop; and exiting the battery packs corresponding to the rest of the battery management systems from the main loop according to the isolation instruction, wherein the exiting of the main loop can be realized by executing the disconnection operation of a discharge switch and/or a charge switch by the battery management system.
Example 2
The embodiment of the invention belongs to the same inventive concept as the embodiment 1, and provides a control system of parallel battery packs, which comprises:
the system comprises a main control determining module, a battery management module and a battery management module, wherein the main control determining module is used for determining a main control unit corresponding to a battery management system of a parallel battery pack, and the battery management system which is not determined as the main control unit is determined as a slave unit of the main control unit;
the data feedback module is used for feeding back branch detection data of a battery pack corresponding to a first battery management system to the main control unit, wherein the branch detection data comprises a branch current of the battery pack corresponding to the first battery management system;
the data receiving module is used for receiving a control instruction sent by the main control unit through a second battery management system, wherein the control instruction is determined by the main control unit through the branch detection data, and the first battery management system and the second battery management system are both determined as slave units;
and the execution module is used for adding or withdrawing the battery pack corresponding to the second battery management system into or from a main loop according to the control instruction, wherein the main loop comprises the parallel battery pack and load equipment, or the main loop comprises the parallel battery pack and charging equipment.
In some implementations, all or part of the main control determining module, the data feedback module, the data receiving module, and the executing module may be configured in the battery management system, and the protection board may also be configured in the instruction processing system if it supports an independent instruction processing system.
Example 3
The embodiment of the invention and the embodiments 1 and 2 belong to the same invention concept, the embodiment of the invention provides a power supply device, the power supply device comprises a parallel battery pack, the parallel battery pack and load equipment or charging equipment form a main loop, the parallel battery pack comprises a plurality of battery packs, each battery pack is positioned in a branch, a battery module, a discharge switch and a charging switch are connected in series on the branch, the discharge switch is also connected in parallel with a first trigger diode, the anode of the first trigger diode is connected with the cathode of the battery module, the charging switch is also connected in parallel with a second trigger diode, and the cathode of the second trigger diode is connected with the cathode of the first trigger diode; the discharging switch, the charging switch, the first trigger diode and the second trigger diode may be disposed on a battery protection circuit board, the battery protection circuit board (which may be an electronic device and may be used to implement a battery management system) has an instruction processing chip (such as an MCU) and a memory connected to the instruction processing chip, the memory stores instructions executable by the at least one processor, the at least one processor implements the foregoing method by executing the instructions stored in the memory, the instruction processing chip may have a current detection interface connected to the current detection point on the branch or connected to the current detection point on the branch through a current detection circuit, and the instruction processor may be used to monitor parameters of the battery module; any one battery protection circuit board is connected with any other battery protection circuit board through an RS485 interface or a CAN line, or any one battery protection circuit board is connected with a CAN bus through a CAN interface or a converter.
Example 4
The embodiment of the present invention is the same as embodiments 1 to 3, and the embodiment of the present invention provides a vehicle, which may be a motor home, and may have the power supply device described in embodiment 3, and the vehicle is further configured with a central control system, and the central control system may include a touch screen with an instruction processing capability or an industrial personal computer with an interactive input and output capability, and the like, and the central control system may be used as a main control unit, and data of all parallel battery packs is uploaded to the central control system, and the central control system performs judgment and issues an instruction.
Example 5
The embodiment of the present invention belongs to the same inventive concept as embodiments 1 to 4, and an embodiment of the present invention provides a computer-readable storage medium storing a computer instruction, which, when running on a computer, causes the computer to execute the method for controlling parallel battery packs described in embodiment 1.
Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, the embodiments of the present invention are not limited to the details of the above embodiments, and various simple modifications can be made to the technical solutions of the embodiments of the present invention within the technical idea of the embodiments of the present invention, and the simple modifications all belong to the protection scope of the embodiments of the present invention.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, the embodiments of the present invention do not describe every possible combination.
Those skilled in the art will understand that all or part of the steps in the method according to the above embodiments may be implemented by a program, which is stored in a storage medium and includes several instructions to enable a single chip, a chip, or a processor (processor) to execute all or part of the steps in the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In addition, any combination of various different implementation manners of the embodiments of the present invention is also possible, and the embodiments of the present invention should be considered as disclosed in the embodiments of the present invention as long as the combination does not depart from the spirit of the embodiments of the present invention.
Claims (10)
1. A control method for parallel battery packs is characterized by comprising the following steps:
determining a master unit corresponding to a battery management system of parallel battery packs, wherein the battery management system which is not determined as the master unit is determined as a slave unit of the master unit;
feeding back branch detection data of a battery pack corresponding to a first battery management system to the main control unit, wherein the branch detection data comprises branch current of the battery pack corresponding to the first battery management system;
receiving a control instruction sent by the master control unit through a second battery management system, wherein the control instruction is determined by the master control unit through the branch detection data, and the first battery management system and the second battery management system are both determined as slave units;
and adding or withdrawing the battery pack corresponding to the second battery management system into a main loop according to the control instruction, wherein the main loop comprises the parallel battery pack and load equipment, or the main loop comprises the parallel battery pack and charging equipment.
2. The method for controlling the parallel battery packs according to claim 1, wherein the determining the main control unit corresponding to the battery management system of the parallel battery packs comprises:
determining a first communication address corresponding to a battery management system of any one of the parallel battery packs;
and if the second communication address is determined to be present before the first communication address, determining that the battery management system corresponding to the second communication address is the main control unit corresponding to the battery management system of the parallel battery pack, or,
and if any communication address sequenced before the sequencing of the first communication address does not exist, determining that the battery management system corresponding to the first communication address is the main control unit corresponding to the battery management system of the parallel battery pack.
3. The method for controlling parallel battery packs according to claim 1, wherein the feeding back the branch detection data of the battery pack corresponding to the first battery management system to the main control unit includes:
determining a branch current of a battery pack corresponding to a first battery management system;
determining a first charging or discharging activation state of a battery pack corresponding to the first battery management system according to the current direction of the branch current;
feeding back branch detection data having the branch current and the first charge or discharge activation state to the main control unit.
4. The method according to claim 2, wherein after the feeding back the branch detection data of the battery pack corresponding to the first battery management system to the main control unit and before the receiving of the control command sent by the main control unit by the second battery management system, the method further comprises:
determining an identification value corresponding to the current direction of the branch current in the branch detection data through a battery management system serving as the main control unit;
determining, by a battery management system as the master control unit, a control instruction corresponding to the identification value or a sum of the determined identification values.
5. The method according to claim 3, wherein the control command sent by the master control unit is received by a second battery management system, wherein,
the control instructions are for controlling the second battery management system to change a second charge or discharge activation state to a charge or discharge activation state that is the same as the first charge or discharge activation state,
the second charge or discharge activation state is a charge or discharge activation state of a battery pack corresponding to the second battery management system.
6. The method for controlling parallel battery packs according to claim 5, wherein the adding or dropping out the battery pack corresponding to the second battery management system to the main loop according to the control instruction comprises:
controlling the second battery management system to actively switch the on-off state of the switch on the current branch to the on-off state of the switch added into the main loop according to the control instruction, wherein,
and the current branch is the branch where the battery pack corresponding to the second battery management system is located.
7. The control method of the parallel battery packs according to any one of claims 1 to 6, characterized by further comprising:
determining branch detection data acquired by any battery management system to trigger a battery protection condition, wherein a battery pack to be isolated corresponding to the battery management system is in a charging or discharging activation state, and the branch detection data acquired by the battery management system includes voltage and/or branch current of the battery pack to be isolated;
and exiting the battery pack to be isolated out of the main loop through any one battery management system.
8. A control system for parallel battery packs, the control system comprising:
the system comprises a main control determining module, a battery management module and a battery management module, wherein the main control determining module is used for determining a main control unit corresponding to a battery management system of a parallel battery pack, and the battery management system which is not determined as the main control unit is determined as a slave unit of the main control unit;
the data feedback module is used for feeding back branch detection data of a battery pack corresponding to a first battery management system to the main control unit, wherein the branch detection data comprises a branch current of the battery pack corresponding to the first battery management system;
the data receiving module is used for receiving a control instruction sent by the main control unit through a second battery management system, wherein the control instruction is determined by the main control unit through the branch detection data, and the first battery management system and the second battery management system are both determined as slave units;
and the execution module is used for adding or withdrawing the battery pack corresponding to the second battery management system into or from a main loop according to the control instruction, wherein the main loop comprises the parallel battery pack and load equipment, or the main loop comprises the parallel battery pack and charging equipment.
9. An electronic device, comprising:
at least one processor;
a memory coupled to the at least one processor;
wherein the memory stores instructions executable by the at least one processor, the at least one processor implementing the method of any one of claims 1 to 7 by executing the instructions stored by the memory.
10. A vehicle characterized in that it has an electronic device according to claim 9.
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| CN114976506A (en) * | 2022-05-19 | 2022-08-30 | 盐城国投中科新能源科技有限公司 | Parallel device for starting lithium battery system and using method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206595315U (en) * | 2017-01-20 | 2017-10-27 | 江西优特汽车技术有限公司 | A kind of battery bag connects protection system |
| CN110048178A (en) * | 2019-04-08 | 2019-07-23 | 江苏天合储能有限公司 | A kind of automatic dilatation balancing battery management system of lithium battery |
| CN111391713A (en) * | 2020-04-29 | 2020-07-10 | 常州洪记两轮智能交通工具有限公司 | Charging and discharging management system and method for series battery pack |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206595315U (en) * | 2017-01-20 | 2017-10-27 | 江西优特汽车技术有限公司 | A kind of battery bag connects protection system |
| CN110048178A (en) * | 2019-04-08 | 2019-07-23 | 江苏天合储能有限公司 | A kind of automatic dilatation balancing battery management system of lithium battery |
| CN111391713A (en) * | 2020-04-29 | 2020-07-10 | 常州洪记两轮智能交通工具有限公司 | Charging and discharging management system and method for series battery pack |
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