CN111025160A - Battery management system and method based on wireless communication - Google Patents
Battery management system and method based on wireless communication Download PDFInfo
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- CN111025160A CN111025160A CN201911356280.9A CN201911356280A CN111025160A CN 111025160 A CN111025160 A CN 111025160A CN 201911356280 A CN201911356280 A CN 201911356280A CN 111025160 A CN111025160 A CN 111025160A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/02—Means for indicating or recording specially adapted for thermometers
- G01K1/024—Means for indicating or recording specially adapted for thermometers for remote indication
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
- G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M10/4257—Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4278—Systems for data transfer from batteries, e.g. transfer of battery parameters to a controller, data transferred between battery controller and main controller
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Chemical Kinetics & Catalysis (AREA)
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- General Chemical & Material Sciences (AREA)
- Computer Networks & Wireless Communication (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The invention provides a battery management system and method based on wireless communication, comprising: the system comprises a first control unit, a second control unit and a control unit, wherein the first control unit is used for receiving a target numerical value of a battery module, and the battery module comprises at least one battery cell; the target values include at least one of: voltage value, temperature value, voltage difference value; and the second control unit is in wireless communication with the first control unit and is used for controlling the first control unit to receive the target value of the battery module and monitoring the battery module according to the target value of the battery module. According to the invention, by adopting a wireless communication mode in the battery pack and based on ZigBee signal transmission, wiring harnesses and plug-ins in the battery pack are omitted, especially wiring harnesses and plug-ins between the battery module and the battery monitoring unit BMU and between the battery management unit BCU and the battery monitoring unit BMU are omitted, so that the internal space of the battery pack is saved, and the battery pack has the characteristics of safety and reliability; the problem caused by the wiring harness and the plug-in the battery pack is solved.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a battery management system and method based on wireless communication.
Background
The Battery Management System (BMS) is used for improving the utilization rate of the Battery, preventing the Battery from being overcharged and overdischarged, ensuring the use of the Battery more safely, more efficiently, more intelligently and longer in service life, and can be used for electric vehicles, Battery cars, electric energy storage systems and the like. At present, the transmission mode of battery signals in a battery pack is a wired connection mode depending on a low-voltage wiring harness and a plug-in unit, and the transmission mode has the following defects:
(1) the fixed point falls off and the wire harness is damaged in the process of installing, fixing and durable use of the low-voltage wire harness, so that the short circuit of the wire harness is caused, and the device is burnt, thereby causing accidents;
(2) the low-voltage wire harness and the plug-in unit are aged and vibrated, so that unreliable connection is caused, and communication failure is caused;
(3) the low-voltage wire harness and the connectors occupy the internal space of the battery when being arranged, so that the internal space is crowded, the difficulty is increased for the internal structure design, the assembly process is complex, and the reliability is difficult to guarantee.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, it is an object of the present invention to provide a battery management system and method based on wireless communication, which is used to solve the technical problems in the prior art.
To achieve the above and other related objects, the present invention provides a battery management system based on wireless communication, including:
the system comprises a first control unit, a second control unit and a control unit, wherein the first control unit is used for receiving a target numerical value of a battery module, and the battery module comprises at least one battery cell; the target values include at least one of: voltage value, temperature value;
and the second control unit is in wireless communication with the first control unit and is used for controlling the first control unit to receive the target value of the battery module and monitoring the battery module according to the target value of the battery module.
Optionally, if the target value is a voltage value, the second control unit calculates a voltage difference between the battery cells, and monitors the battery module according to the voltage difference.
Optionally, the system further comprises a first obtaining unit, wherein the first obtaining unit is connected with the first control unit and is used for obtaining a target value of the battery module.
Optionally, the mobile terminal further comprises a second obtaining unit, connected to the second control unit, for obtaining an external wake-up signal or an external sleep signal;
the second control unit executes awakening according to the external awakening signal; the second control unit performs sleep according to the external sleep signal.
Optionally, the wireless communication device further comprises a wireless communication unit, and the wireless communication unit is connected with the first control unit and the second control unit respectively, and is used for establishing wireless communication between the first control unit and the second control unit.
Optionally, the communication signal transmitted by the wireless communication unit at least comprises a ZigBee signal.
Optionally, the power supply device further comprises a power supply unit, wherein the power supply unit specifically comprises an external power supply and an internal power supply; the external power source includes a vehicle battery and the internal power source includes a button cell.
Optionally, if the target value is not within the preset threshold range, sending a fault signal to perform fault early warning;
if the target value is within a preset threshold range, judging whether the target value meets a preset balance condition, and if the target value meets the preset balance condition, starting balance; and if the target value does not meet the preset balance condition, continuing monitoring the battery module and acquiring the target value again.
The invention also provides a battery management method based on wireless communication, which comprises the following steps:
receiving a target numerical value of a battery module through a first control unit, wherein the battery module comprises at least one battery cell; the target value includes at least one of: voltage value, temperature value;
and transmitting the target value of the battery module to a second control unit based on wireless communication, wherein the second control unit monitors the battery module according to the target value of the battery module.
Optionally, if the target value is not within the preset threshold range, sending a fault signal to perform fault early warning;
if the target value is within a preset threshold range, judging whether the target value meets a preset balance condition, and if the target value meets the preset balance condition, starting balance; and if the target value does not meet the preset balance condition, continuing monitoring the battery module and acquiring the target value again.
As described above, the present invention provides a battery management system and method based on wireless communication, which has the following advantages: the battery pack control system comprises a first control unit, a second control unit and a control unit, wherein the first control unit is used for receiving a target value of a battery cell, and the target value of the battery cell at least comprises a voltage value and/or a temperature value of the battery cell; and the second control unit is in wireless communication with the first control unit and is used for controlling the first control unit to receive the target numerical value of the battery core and monitoring the battery module according to the target numerical value of the battery core. According to the invention, a wireless communication mode is adopted in the battery pack, wireless communication and transmission are carried out through the ZigBee signal, so that a wire harness and a plug-in unit in the battery pack are omitted, and the application does not adopt line speed connection in the battery pack, so that the internal space of the battery pack is saved; the device can not be burnt down due to falling of the wiring harness, so that the battery pack has the characteristics of safety and reliability, and the defects or problems caused by the wiring harness and the plug-in components in the battery pack are solved.
Drawings
Fig. 1 is a schematic hardware structure diagram of a wireless control system according to an embodiment.
Fig. 2 is a schematic diagram of a hardware structure of a wireless control system according to another embodiment.
Fig. 3 is a schematic diagram of a hardware structure of a conventional battery pack according to an embodiment.
Fig. 4 is a schematic diagram of a hardware structure of a battery pack according to the present application according to an embodiment.
Fig. 5 is a schematic diagram of a hardware structure of a battery monitoring unit according to an embodiment.
Fig. 6 is a schematic diagram of a hardware structure of a battery management unit according to an embodiment.
Fig. 7 is a flowchart illustrating a wireless control method according to an embodiment.
Fig. 8 is a flowchart illustrating a wireless control method according to another embodiment.
Description of the element reference numerals
BMS battery management system
BMU battery monitoring unit
BCU battery management unit
MCU first control unit
Second control unit of CPU
AFE analog front end
X battery module
Y battery pack
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
Please refer to fig. 1 to 8. It should be noted that the drawings provided in the present embodiment are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated. The structures, proportions, sizes, and other dimensions shown in the drawings and described in the specification are for understanding and reading the present disclosure, and are not intended to limit the scope of the present disclosure, which is defined in the claims, and are not essential to the art, and any structural modifications, changes in proportions, or adjustments in size, which do not affect the efficacy and attainment of the same are intended to fall within the scope of the present disclosure. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.
Referring to fig. 1, the present embodiment provides a battery management system based on wireless communication, including: the first control unit is used for receiving a target numerical value of a battery module, and the battery module comprises one or more battery cores; a single battery cell can directly form a battery MODULE, a plurality of battery cells can be connected in series and/or in parallel to form the battery MODULE, and battery MODULE (MODULE) X is located in battery pack Y. The target value comprises a voltage value of a battery core in a battery MODULE (MODULE) X and a temperature value of the battery core in the battery MODULE (MODULE) X.
And the second control unit is in wireless communication with the first control unit and is used for controlling the first control unit to receive the target value of the battery module and monitoring the battery module according to the target value of the battery module. And if the target value is a voltage value, the second control unit calculates a voltage difference value between the electric cores, and monitors the battery module according to the voltage difference value.
According to the invention, a wireless communication mode is adopted in the battery pack, so that a wiring harness and a plug-in the battery pack are omitted, the internal space of the battery pack is saved, the battery pack has the characteristics of safety and reliability, and the problem caused by the wiring harness and the plug-in the battery pack is solved.
In an exemplary embodiment, the system further comprises a first obtaining unit, configured to obtain a target value of the battery module; the first acquisition unit is connected with the first control unit, the first control unit controls the first acquisition unit to acquire the target numerical value of the battery module, and the first acquisition unit further transmits the acquired target numerical value of the battery module to the first control unit.
In an exemplary embodiment, the mobile terminal further includes a second obtaining unit, configured to obtain an external wake-up signal or an external sleep signal; the second acquisition unit is connected with the second control unit, the second acquisition unit transmits the acquired external wake-up signal or the external sleep signal to the second control unit, the second control unit transmits the received external wake-up signal or the received external sleep signal to the first control unit in a wireless communication mode, and the first control unit and the second control unit perform wake-up according to the external wake-up signal; or the first control unit and the second control unit perform sleep according to the external sleep signal.
In an exemplary embodiment, the wireless communication unit is further included, and the wireless communication unit is connected to the first control unit and the second control unit respectively, and is configured to establish wireless communication between the first control unit and the second control unit. Specifically, the wireless communication unit comprises a first wireless communication subunit and a second wireless communication subunit; the first wireless communication subunit is connected with the first control unit, and the second wireless communication subunit is connected with the second control unit; the first wireless communication subunit establishes wireless communication with the second wireless communication subunit, which is equivalent to the first control unit establishing wireless communication with the second control unit. The communication signal transmitted by the wireless communication unit includes but is not limited to a ZigBee signal, that is, a signal mutually transmitted by the first wireless communication subunit and the second wireless communication subunit is a ZigBee signal or another wireless signal, which is equivalent to performing wireless communication between the second control unit and the first control unit by using the ZigBee signal or another wireless signal.
In an exemplary embodiment, the system further comprises a power supply unit for supplying power to the whole system, including providing an external power supply and an internal power supply; the external power source includes a vehicle battery and the internal power source includes a button cell.
Specifically, the master-slave battery management system BMS includes a battery monitoring unit BMU and a battery management unit BCU. The voltage and temperature signal acquisition and transmission mode of the battery cell in the master-slave battery management system BMS at present is (transmission sequence from left to right): the method comprises the following steps of (1) obtaining signals of an electric core or a battery module, a voltage/temperature collection point, a collection plate (or a wire harness)/a plug-in unit, a battery monitoring unit BMU, a wire harness/a plug-in unit and a battery management unit BCU, and obtaining the result that in the prior art, the signals between the battery module and the battery monitoring unit BMU, and between the battery monitoring unit BMU and the battery management unit BCU depend on a low-voltage wire harness, and the signals are transmitted between the battery monitoring unit BMU and the battery management unit BCU at a low-voltage linear speed to cause some problems; such as unstable linear speed installation and fixation, easy aging of the wiring harness plug-in unit, occupation of the wiring harness plug-in unit in the internal space of the battery pack and the like. In the embodiment of the application, the first control unit, the first obtaining unit and the first wireless communication subunit together form a battery monitoring unit; the second control unit, the second acquisition unit and the second wireless communication subunit together form a battery management unit. The BCU controls the BMU to acquire information such as voltage and temperature in the battery pack, namely, the voltage value and the temperature value of the battery core in the battery pack. The BMU also transmits the acquired information such as voltage, temperature and the like to the BCU in a wireless communication mode; the battery management unit BCU detects and manages the battery core in the battery pack according to the information sent by the battery monitoring unit BMU, namely, the information such as the voltage and the temperature of the battery core is monitored. The first wireless communication subunit and the second wireless communication subunit adopt ZigBee signals for wireless communication, namely the battery management unit and the battery monitoring unit adopt ZigBee signals for wireless communication, so that the problem that the existing battery management unit and the existing battery monitoring unit are connected by adopting a wire harness and a plug-in unit can be solved; the wire harness and the plug-in the battery pack are omitted, particularly the wire harness and the plug-in between the battery management unit BCU and the battery monitoring unit BMU in the battery pack are omitted, so that communication failure caused by linear speed aging between the battery management unit BCU and the battery monitoring unit BMU is avoided; in addition, the linear speed and the plug-in connection are not adopted in the battery pack, so that the internal space of the battery pack is saved; the device can not be burnt down due to falling of the wiring harness, so that the battery pack has the characteristics of safety and reliability, and the defects or problems caused by the wiring harness and the plug-in components in the battery pack are solved.
Specifically, as shown in fig. 2, the second acquisition unit, the second control unit, and the second wireless communication subunit constitute a battery management unit BCU, and the first acquisition unit, the first control unit, and the first wireless communication subunit constitute a battery monitoring unit BMU. The battery management unit BCU and the battery monitoring unit BMU are in wireless communication through ZigBee signals, and wireless communication between the battery management unit BCU and the battery monitoring unit BMU is achieved by adopting an IEEE802.15.4 protocol.
A second acquisition unit in the battery management unit BCU transmits a received awakening signal input from the outside to a second control unit CPU to awaken the second control unit CPU, meanwhile, the second control unit CPU controls a second wireless communication subunit to establish wireless communication with a first wireless communication subunit through a ZigBee signal, and after the wireless communication is established, the second control unit CPU wirelessly transmits the awakening signal to a first control unit MCU to awaken the first control unit MCU. The awakened first control unit MCU starts to control the first acquisition unit to acquire the voltage value, the temperature value and the like of the battery core. The first acquisition unit forms an analog front end AFE in the battery monitoring unit BMU, namely, the voltage value of an electric core in the battery module and the temperature value of the electric core in the battery module are acquired through the analog front end AFE; the collected voltage value and temperature value are transmitted to a first control unit MCU, the first control unit MCU controls a first wireless communication subunit to establish wireless communication with a second wireless communication subunit through a ZigBee signal, and the detected voltage value and temperature value are wirelessly transmitted to a second control unit CPU; and the second control unit CPU calculates the voltage difference value of the battery core in the battery module according to the received voltage value, and judges whether the detected voltage value, temperature value and voltage difference value are within a preset threshold range. If the judgment result is that one or more of the voltage value, the temperature value and the voltage difference value exceed the threshold protection range, the second control unit CPU sends out a fault signal; if the judgment result is that the voltage value, the temperature value and the voltage difference value are all within the threshold protection range, the second control unit CPU judges whether the voltage value, the temperature value and the voltage difference value reach the preset balance condition or not; if the preset balance condition is not met, the second control unit CPU continues to monitor the battery cell and simulates a front end AFE to continue to acquire the voltage value and the temperature value of the battery cell; if the preset equalization condition is met, the second control unit CPU wirelessly transmits a signal for starting equalization to the first control unit MCU, and the first control unit MCU starts equalization and feeds back the equalization to the second control unit CPU through wireless transmission; and after the equalization is finished, the second control unit CPU wirelessly transmits a signal for closing the equalization to the first control unit MCU, and the first control unit MCU closes the equalization. The preset equalization condition may be flexibly set according to an actual situation, for example, the equalization condition in the embodiment of the present application may be set as: the voltage difference value of the battery cell reaches a set value, and the difference value between the battery cell SOC and the average value of the battery cell SOC reaches the set value; when the voltage difference value of the battery cell reaches a set value or the difference value of the battery cell SOC and the average SOC reaches a set value, starting equalization; the SOC represents the ratio of the residual capacity to the capacity of the fully charged state of the battery, the value range of the SOC is 0-1, the SOC is 0 and represents that the battery is completely discharged, and the SOC is 1 and represents that the battery is completely charged.
A second acquisition unit in the battery management unit BCU transmits a received sleep signal input from the outside to a second control unit CPU, the second control unit CPU controls a second wireless communication subunit to establish wireless communication with a first wireless communication subunit through a ZigBee signal, and after the communication is established, the second control unit CPU wirelessly transmits the sleep signal to a first control unit MCU to enable the first control unit MCU and the second control unit CPU to sleep.
As shown in fig. 3 and 4, fig. 3 is a prior art battery pack, in which the battery module is connected to the battery monitoring unit BMU by using a wire speed and a plug-in; fig. 4 is a battery pack of the present application, in which a battery monitoring unit BMU is integrated on a battery module in the battery pack, and the battery modules are connected with each other through a copper bar; compared with the prior art, the application reduces the use of the wire harness and the plug-in, can save the production cost and reduce the failure rate.
In an exemplary embodiment, the system further comprises a power supply unit for supplying power to the whole system, including providing an external power supply and an internal power supply; the external power source includes a vehicle battery and the internal power source includes a button cell. As shown in fig. 5, in a normal state, the analog front end AFE continuously outputs direct current to the first control unit MCU, the first wireless communication subunit and the second wireless communication subunit are kept in an awake state all the time in a life cycle, and the first control unit MCU and other units operate or sleep according to a vehicle state. If extreme conditions are met, the analog front end AFE does not output direct current any more, the button battery is connected with the first control unit MCU, power can be supplied to the battery monitoring unit BMU, and the battery monitoring unit BMU is kept working. As shown in fig. 6, the vehicle battery serves as an external power supply to provide a low-voltage power supply for the battery management unit BCU, and the battery management unit BCU realizes input and output of information external to the battery pack, such as input of battery power supply, input of an external wake-up signal, and input of an external sleep signal, in a low-voltage harness and CAN communication manner.
The system comprises a first acquisition unit, a second acquisition unit and a third acquisition unit, wherein the first acquisition unit is used for acquiring a target numerical value of a battery MODULE, the battery MODULE comprises one or more battery cores, a single battery core can directly form the battery MODULE, a plurality of battery cores are connected in series and/or in parallel to form the battery MODULE, and a battery MODULE (Module) X is positioned in a battery pack Y; the target numerical value comprises a voltage value of a battery core in a battery MODULE (MODULE) X and a temperature value of the battery core in the battery MODULE (MODULE) X; the first control unit is connected with the first acquisition unit and used for controlling the first acquisition unit to acquire a target value of the battery module and receiving the target value of the battery module acquired by the first acquisition unit; the second control unit is in wireless communication with the first control unit through a wireless communication unit and used for controlling the first control unit to receive the target value of the battery module and monitoring the battery module according to the target value of the battery module, wherein the signal transmitted by the wireless communication unit comprises a ZigBee signal. According to the invention, the battery management unit BCU and the battery monitoring unit BMU adopt a wireless communication mode in the battery pack, wireless communication and transmission are carried out through ZigBee signals, so that a wire harness and a plug-in unit in the battery pack are omitted, particularly, the wire harness and the plug-in unit between the battery management unit BCU and the battery monitoring unit BMU in the battery pack are omitted, and therefore, communication failure caused by linear speed aging between the battery management unit BCU and the battery monitoring unit BMU is avoided; in addition, the linear speed connection is not adopted in the battery pack, so that the internal space of the battery pack is saved; the device can not be burnt down due to falling of the wiring harness, so that the battery pack has the characteristics of safety and reliability, and the defects or problems caused by the wiring harness and the plug-in components in the battery pack are solved.
As shown in fig. 7 and 8, the present invention also provides a battery management method based on wireless communication, which includes:
acquiring a wake-up signal, executing wake-up according to the wake-up signal, entering a wake-up state, and acquiring a target numerical value;
and acquiring a sleep signal, and executing sleep according to the sleep signal.
In the awakening state, a target value of the battery MODULE is received through the first control unit, and the target value comprises a voltage value of an electric core in the battery MODULE (MODULE) X and a temperature value of the electric core in the battery MODULE (MODULE) X.
And transmitting the target value of the battery module to a second control unit based on wireless communication, wherein the second control unit monitors the battery module according to the target value of the battery module. Specifically, whether the target value is within a preset threshold range is judged, and if the target value is not within the preset threshold range, a fault signal is sent out to perform fault early warning; if the target value is within a preset threshold range, judging whether the target value meets a preset balance condition, and if the target value meets the preset balance condition, starting balance; and if the target value does not meet the preset balance condition, continuing monitoring the battery module and acquiring the target value again. The target value comprises a voltage value of a battery core in a battery MODULE (MODULE) X and a temperature value of the battery core in the battery MODULE (MODULE) X.
Specifically, the master-slave battery management system BMS includes a battery monitoring unit BMU and a battery management unit BCU. The voltage and temperature signal acquisition and transmission mode of the battery cell in the master-slave battery management system BMS at present is (transmission sequence from left to right): the method comprises the following steps of (1) obtaining signals of an electric core or a battery module, a voltage/temperature collection point, a collection plate (or a wire harness)/a plug-in unit, a battery monitoring unit BMU, a wire harness/a plug-in unit and a battery management unit BCU, and obtaining the result that in the prior art, the signals between the battery module and the battery monitoring unit BMU, and between the battery monitoring unit BMU and the battery management unit BCU depend on a low-voltage wire harness, and the signals are transmitted between the battery monitoring unit BMU and the battery management unit BCU at a low-voltage linear speed to cause some problems; such as unstable linear speed installation and fixation, easy aging of the wiring harness plug-in unit, occupation of the wiring harness plug-in unit in the internal space of the battery pack and the like. In the embodiment of the application, the first control unit, the first obtaining unit and the first wireless communication subunit together form a battery monitoring unit; the second control unit, the second acquisition unit and the second wireless communication subunit together form a battery management unit. The battery management unit BCU controls the battery monitoring unit BMU to acquire information such as voltage and temperature in the battery pack, namely, a voltage value of an electric core in the battery pack, a temperature value of the electric core, a voltage value of the electric core in the battery module, a temperature value of the electric core in the battery module and a voltage difference value of the electric core in the battery module. The BMU also transmits the acquired information such as voltage, temperature and the like to the BCU in a wireless communication mode; the battery management unit BCU detects and manages the battery core in the battery pack according to the information sent by the battery monitoring unit BMU, namely, the information such as the voltage and the temperature of the battery core is monitored. The first wireless communication subunit and the second wireless communication subunit adopt ZigBee signals for wireless communication, namely the battery management unit and the battery monitoring unit adopt ZigBee signals for wireless communication, so that the problem that the existing battery management unit and the existing battery monitoring unit are connected by adopting a wire harness and a plug-in unit can be solved; the wire harness and the plug-in the battery pack are omitted, particularly the wire harness and the plug-in between the battery management unit BCU and the battery monitoring unit BMU in the battery pack are omitted, so that communication failure caused by linear speed aging between the battery management unit BCU and the battery monitoring unit BMU is avoided; in addition, the linear speed and the plug-in connection are not adopted in the battery pack, so that the internal space of the battery pack is saved; the device can not be burnt down due to falling of the wiring harness, so that the battery pack has the characteristics of safety and reliability, and the defects or problems caused by the wiring harness and the plug-in components in the battery pack are solved.
Specifically, as shown in fig. 2, the second acquisition unit, the second control unit, and the second wireless communication subunit constitute a battery management unit BCU, and the first acquisition unit, the first control unit, and the first wireless communication subunit constitute a battery monitoring unit BMU. The battery management unit BCU and the battery monitoring unit BMU are in wireless communication through ZigBee signals, and wireless communication between the battery management unit BCU and the battery monitoring unit BMU is achieved by adopting an IEEE802.15.4 protocol.
A second acquisition unit in the battery management unit BCU transmits a received awakening signal input from the outside to a second control unit CPU to awaken the second control unit CPU, meanwhile, the second control unit CPU controls a second wireless communication subunit to establish wireless communication with a first wireless communication subunit through a ZigBee signal, and after the wireless communication is established, the second control unit CPU wirelessly transmits the awakening signal to a first control unit MCU to awaken the first control unit MCU. The awakened first control unit MCU starts to control the first acquisition unit to acquire the voltage value, the temperature value and the like of the battery core. The first acquisition unit forms an analog front end AFE in the battery monitoring unit BMU, namely, the voltage value of an electric core in the battery module and the temperature value of the electric core in the battery module are acquired through the analog front end AFE; the collected voltage value and temperature value are transmitted to a first control unit MCU, the first control unit MCU controls a first wireless communication subunit to establish wireless communication with a second wireless communication subunit through a ZigBee signal, and the detected voltage value and temperature value are wirelessly transmitted to a second control unit CPU; and the second control unit CPU calculates the voltage difference value of the battery core in the battery module according to the received voltage value, and judges whether the detected voltage value, temperature value and voltage difference value are within a preset threshold range. If the judgment result is that one or more of the voltage value, the temperature value and the voltage difference value exceed the threshold protection range, the second control unit CPU sends out a fault signal; if the judgment result is that the voltage value, the temperature value and the voltage difference value are all within the threshold protection range, the second control unit CPU judges whether the voltage value, the temperature value and the voltage difference value reach the preset balance condition or not; if the preset balance condition is not met, the second control unit CPU continues to monitor the battery cell and simulates a front end AFE to continue to acquire the voltage value and the temperature value of the battery cell; if the preset equalization condition is met, the second control unit CPU wirelessly transmits a signal for starting equalization to the first control unit MCU, and the first control unit MCU starts equalization and feeds back the equalization to the second control unit CPU through wireless transmission; and after the equalization is finished, the second control unit CPU wirelessly transmits a signal for closing the equalization to the first control unit MCU, and the first control unit MCU closes the equalization. The preset equalization condition may be flexibly set according to an actual situation, for example, the equalization condition in the embodiment of the present application may be set as: the voltage difference value of the battery cell reaches a set value, and the difference value between the battery cell SOC and the average value of the battery cell SOC reaches the set value; when the voltage difference value of the battery cell reaches a set value or the difference value of the battery cell SOC and the average SOC reaches a set value, starting equalization; the SOC represents the ratio of the residual capacity to the capacity of the fully charged state of the battery, the value range of the SOC is 0-1, the SOC is 0 and represents that the battery is completely discharged, and the SOC is 1 and represents that the battery is completely charged.
A second acquisition unit in the battery management unit BCU transmits a received sleep signal input from the outside to a second control unit CPU, the second control unit CPU controls a second wireless communication subunit to establish wireless communication with a first wireless communication subunit through a ZigBee signal, and after the communication is established, the second control unit CPU wirelessly transmits the sleep signal to a first control unit MCU to enable the first control unit MCU and the second control unit CPU to sleep.
As shown in fig. 3 and 4, fig. 3 is a prior art battery pack, in which the battery module is connected to the battery monitoring unit BMU by using a wire speed and a plug-in; fig. 4 is a battery pack of the present application, in which a battery monitoring unit BMU is integrated on a battery module in the battery pack, and the battery modules are connected with each other through a copper bar; compared with the prior art, the application reduces the use of the wire harness and the plug-in, can save the production cost and reduce the failure rate.
In an exemplary embodiment, the system further comprises a power supply unit for supplying power to the whole system, including providing an external power supply and an internal power supply; the external power source includes a vehicle battery and the internal power source includes a button cell. As shown in fig. 5, in a normal state, the analog front end AFE continuously outputs direct current to the first control unit MCU, the first wireless communication subunit and the second wireless communication subunit are kept in an awake state all the time in a life cycle, and the first control unit MCU and other units operate or sleep according to a vehicle state. If extreme conditions are met, the analog front end AFE does not output direct current any more, the button battery is connected with the first control unit MCU, power can be supplied to the battery monitoring unit BMU, and the battery monitoring unit BMU is kept working. As shown in fig. 6, the vehicle battery serves as an external power supply to provide a low-voltage power supply for the battery management unit BCU, and the battery management unit BCU realizes input and output of information external to the battery pack, such as input of battery power supply, input of an external wake-up signal, and input of an external sleep signal, in a low-voltage harness and CAN communication manner.
The method includes the steps that a target value of a battery MODULE is obtained through a first obtaining unit, the battery MODULE comprises one or more battery cores, a single battery core can directly form the battery MODULE, the plurality of battery cores are connected in series and/or in parallel to form the battery MODULE, and a battery MODULE (MODULE) X is located in a battery pack Y; the target numerical value comprises a voltage value of a battery core in a battery MODULE (MODULE) X and a temperature value of the battery core in the battery MODULE (MODULE) X; the first control unit is connected with the first acquisition unit and used for controlling the first acquisition unit to acquire a target value of the battery module and receiving the target value of the battery module acquired by the first acquisition unit; the second control unit is in wireless communication with the first control unit through a wireless communication unit and used for controlling the first control unit to receive the target value of the battery module and monitoring the battery module according to the target value of the battery module, wherein the signal transmitted by the wireless communication unit comprises a ZigBee signal. According to the invention, the battery management unit BCU and the battery monitoring unit BMU adopt a wireless communication mode in the battery pack, wireless communication and transmission are carried out through ZigBee signals, so that a wire harness and a plug-in unit in the battery pack are omitted, particularly, the wire harness and the plug-in unit between the battery management unit BCU and the battery monitoring unit BMU in the battery pack are omitted, and therefore, communication failure caused by linear speed aging between the battery management unit BCU and the battery monitoring unit BMU is avoided; in addition, the linear speed connection is not adopted in the battery pack, so that the internal space of the battery pack is saved; the device can not be burnt down due to falling of the wiring harness, so that the battery pack has the characteristics of safety and reliability, and the defects or problems caused by the wiring harness and the plug-in components in the battery pack are solved.
In conclusion, the present invention effectively overcomes various disadvantages of the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. A battery management system based on wireless communication is characterized by comprising:
the system comprises a first control unit, a second control unit and a control unit, wherein the first control unit is used for receiving a target numerical value of a battery module, and the battery module comprises at least one battery cell; the target values include at least one of: voltage value, temperature value;
and the second control unit is in wireless communication with the first control unit and is used for controlling the first control unit to receive the target value of the battery module and monitoring the battery module according to the target value of the battery module.
2. The wireless communication-based battery management system of claim 1, wherein: and if the target value is a voltage value, the second control unit calculates a voltage difference value between the electric cores, and monitors the battery module according to the voltage difference value.
3. The wireless communication-based battery management system of claim 1, wherein: the battery module further comprises a first acquisition unit, wherein the first acquisition unit is connected with the first control unit and used for acquiring a target value of the battery module.
4. A battery management system based on wireless communication according to any of claims 1 to 3, characterized in that: the second acquisition unit is connected with the second control unit and is used for acquiring an external wake-up signal or an external sleep signal;
the second control unit executes awakening according to the external awakening signal; the second control unit performs sleep according to the external sleep signal.
5. The wireless communication-based battery management system of claim 1, wherein: the wireless communication unit is respectively connected with the first control unit and the second control unit and used for establishing wireless communication between the first control unit and the second control unit.
6. The wireless communication-based battery management system of claim 5, wherein: the communication signals transmitted by the wireless communication unit at least comprise ZigBee signals.
7. The wireless communication-based battery management system of claim 1, wherein: the power supply unit comprises an external power supply and an internal power supply; the external power source includes a vehicle battery and the internal power source includes a button cell.
8. The wireless communication-based battery management system of claim 1, wherein: if the target value is not within the preset threshold range, sending a fault signal to perform fault early warning;
if the target value is within a preset threshold range, judging whether the target value meets a preset balance condition, and if the target value meets the preset balance condition, starting balance; and if the target value does not meet the preset balance condition, continuing monitoring the battery module and acquiring the target value again.
9. A battery management method based on wireless communication is characterized by comprising the following steps:
receiving a target numerical value of a battery module through a first control unit, wherein the battery module comprises at least one battery cell; the target value includes at least one of: voltage value, temperature value;
and transmitting the target value of the battery module to a second control unit based on wireless communication, wherein the second control unit monitors the battery module according to the target value of the battery module.
10. The wireless communication-based battery management method according to claim 9, wherein:
if the target value is not within the preset threshold range, sending a fault signal to perform fault early warning;
if the target value is within a preset threshold range, judging whether the target value meets a preset balance condition, and if the target value meets the preset balance condition, starting balance; and if the target value does not meet the preset balance condition, continuing monitoring the battery module and acquiring the target value again.
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Application publication date: 20200417 |