CN111098752A - Battery management system and new energy automobile - Google Patents
Battery management system and new energy automobile Download PDFInfo
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- CN111098752A CN111098752A CN201811173262.2A CN201811173262A CN111098752A CN 111098752 A CN111098752 A CN 111098752A CN 201811173262 A CN201811173262 A CN 201811173262A CN 111098752 A CN111098752 A CN 111098752A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/16—Information or communication technologies improving the operation of electric vehicles
Abstract
The invention relates to a battery management system and a new energy automobile, which comprise a main controller, slave controllers and carrier modules, wherein the main controller and the slave controllers are respectively provided with the corresponding carrier modules, each slave controller is used for detecting the battery module corresponding to control connection, each slave controller is connected to a high-voltage cable in the battery management system through the corresponding matched carrier module, and the main controller is connected to the high-voltage cable in the battery management system through the corresponding matched carrier module. The battery management system realizes high-voltage carrier communication, namely, the information to be uploaded by each slave controller is transmitted to the master controller through the high-voltage cable by the carrier module, and the information to be issued by the master controller is transmitted to each slave controller through the carrier module, so that the data transmission rate is improved, the real-time performance of data transmission is ensured, the communication failure rate of the battery management system is reduced, and the reliability of the whole vehicle is improved.
Description
Technical Field
The invention belongs to the technical field of communication of battery management systems, and particularly relates to a battery management system and a new energy automobile.
Background
With the continuous improvement of new energy technologies, the requirements on the configuration electric quantity and the voltage platform of the battery management system are higher and higher, for example, in an electric passenger car, the configuration of the original system is about 200kWh and is improved to over 300kWh, and the voltage platform is improved from original DC500V to DC750V, so that the possibility of further improvement exists in the future. With the configuration of the battery management system being higher and higher, the number of the single batteries is multiplied, and in addition, the estimation of the battery state is more and more accurate, and the data acquisition amount of the battery state is more and more large, so that the communication data amount of the battery management system is more and more large, and the data transmission rate and the real-time performance are influenced.
Compared with the traditional automobile, new energy automobile (including electric automobile and hybrid vehicle) has increased more height, low pressure pencil (be the cable) and has connected, along with electric automobile's intellectuality and environmental suitability promote, battery system need dispose high-pressure cable and low pressure cable, high-pressure cable is including the power cable of the power return circuit of connecting battery module, the heating cable of the heating return circuit of connecting battery module, the low pressure cable includes communication cable, the fire extinguisher cable, and the quantity of cable is constantly increasing, economic cost has been increased. On the other hand, especially for passenger cars, the number of harnesses (especially communication cables) increases the number of communication failure events of the battery management system, and the reliability and safety of the battery management system are affected to some extent for the end customers.
At present, CAN communication is mainly adopted for communication of a battery management system of a new energy automobile, and has the advantages of strong real-time performance, long transmission distance, strong anti-electromagnetic interference capability, low cost, good compatibility, strong error detection capability and the like. Meanwhile, as battery monitoring and management technologies become mature, various sensors and auxiliary modules are configured as necessary, so that the number of low-voltage wire harnesses is increased, the problem of exposed wire harness communication faults is increased, and the reliability and safety of a battery management system are affected.
Disclosure of Invention
The invention aims to provide a battery management system and a new energy automobile, which are used for solving the problems that in the battery management system in the prior art, the communication fault events are increased due to too much communication cables and too much communication data.
In order to solve the technical problems, the invention provides a battery management system which comprises a master controller, slave controllers and carrier modules, wherein each slave controller is used for detecting a battery module corresponding to control connection, the master controller and the slave controllers are respectively provided with corresponding carrier modules, each slave controller is connected with a signal interface of the corresponding matched carrier module, a power line coupling interface of the corresponding matched carrier module is connected to a high-voltage cable in the battery management system, and the high-voltage cable is a cable connected between the battery modules; each slave controller is used for transmitting the information of the corresponding battery module to the high-voltage cable through the corresponding matched carrier module;
the main controller is connected with the signal interface of the corresponding matched carrier module, and the power line coupling interface of the corresponding matched carrier module is connected to the high-voltage cable in the battery management system and used for receiving control information uploaded by each slave controller in the high-voltage cable through the corresponding matched carrier module.
In order to solve the technical problem, the invention further provides a new energy automobile which comprises the battery management system.
According to the invention, the battery management system is utilized to realize high-voltage carrier communication, namely, information to be uploaded by each slave controller is transmitted to the master controller through the high-voltage cable by the carrier module, so that the data transmission rate is improved, the real-time performance of data transmission is ensured, the communication fault rate of the battery management system is reduced, and the reliability of the whole vehicle is improved. In addition, the invention replaces the low-voltage wiring harness used among the battery modules in the battery management system in the prior art, thereby reducing the connection of the wiring harness, lowering the material cost, shortening the supply period of parts, improving the field assembly efficiency and saving the economic cost.
In order to ensure that the master controller quickly issues the control information of each slave controller, the master controller is used for transmitting the detection and control information of the corresponding battery module to the high-voltage cable, and each slave controller is used for receiving the control information of the corresponding battery module issued by the master controller in the high-voltage cable through the corresponding matched carrier module.
In order to further reduce low-voltage wire harnesses and save economic cost, each slave controller and the corresponding matched carrier modules all adopt an independent power supply mode, namely, each slave controller and the corresponding matched carrier modules are connected with the corresponding battery modules through direct-current voltage converters, and the corresponding battery modules are used for supplying power to each slave controller and the corresponding matched carrier modules.
Meanwhile, the high-voltage cable is connected with a main controller through a direct-current voltage converter, and the main controller is respectively connected with a storage battery and a charger.
In order to solve the problem of inconsistent state of charge among the battery modules, the slave controllers are connected with the corresponding matched battery modules through the electric quantity balancing module.
Drawings
FIG. 1 is a schematic diagram of the connections of the battery management system of the present invention;
FIG. 2 is a schematic diagram of the connection of a battery module of the present invention to a slave controller, carrier module;
fig. 3 is a communication flow diagram of the battery management system of the present invention.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
The battery management system shown in fig. 1 comprises a main controller, a plurality of sub-controllers and carrier modules, the number of the carrier modules is matched with that of the main controller, each sub-controller is in control connection with a corresponding battery module and is used for detecting the corresponding battery module, each sub-controller is connected to a high-voltage cable in the battery management system through the corresponding matched carrier module, namely, each sub-controller is connected with a signal interface corresponding to the matched carrier module, a power line coupling interface corresponding to the matched carrier module is connected to the high-voltage cable, the high-voltage cable comprises a power cable in a power loop of the battery management system and a heating cable in a heating loop, the power cable is connected between the battery modules to form a power loop, and the heating cable is connected between the battery modules to form a heating loop. Each slave controller is used for transmitting the information of the corresponding battery module to the high-voltage cable through the carrier module and receiving the control information of the corresponding battery module issued by the master controller in the high-voltage cable through the carrier module.
The main controller is connected to the high-voltage cable in the battery management system through the corresponding matched carrier modules, namely the main controller is connected with the signal interfaces of the corresponding matched carrier modules, the power line coupling interfaces of the corresponding matched carrier modules are connected to the high-voltage cable, the power line coupling interfaces are used for transmitting the detection and control information of the corresponding battery modules to the high-voltage cable, and the carrier modules are used for receiving the control information uploaded by the slave controllers in the high-voltage cable.
Each battery module in fig. 1 is connected through a high-voltage cable and then respectively connected with a motor controller and a motor through a high-voltage junction box, the high-voltage junction box is further connected with a charger, and the vehicle control unit is still respectively connected with a main controller and the motor controller through a low-voltage wire harness (such as a CAN bus).
As shown in fig. 1, each carrier module includes a signal interface, a microprocessor, a signal modulation unit, and a power line coupling interface, which are connected in sequence, where the signal interface is used to connect to a slave controller, and the power line coupling interface is used to connect to a high-voltage cable.
As shown in fig. 2, a slave controller and a corresponding matched carrier module are integrated in the battery module, the slave controller is responsible for collecting information such as temperature and voltage of the battery module, and the master controller is responsible for processing information uploaded by the slave controller and is responsible for information interaction between the vehicle controller and the slave controller. The heating positive electrode and the heating negative electrode in the figure 2 are used for connecting a heating cable, and the battery positive electrode and the battery negative electrode in the figure 2 are used for connecting a power cable.
The communication process for transferring information from the slave controller to the master controller is as follows:
after the data of the battery modules are collected by each slave controller, information processing is carried out, messages are sent to the microprocessor through the signal interface of the carrier module according to a communication protocol, the messages are modulated through the signal modulation module, the modulated messages are sent to the carrier module matched with the master controller through the power cable of the power loop and the heating cable of the heating loop through the power line coupling interface, the messages are sent to the master controller through the power line coupling interface, the communication signal modulation, the microprocessor processing and the signal interface in the carrier module matched with the master controller, and information uploading of each battery module is completed.
The communication process for the master controller to transmit information to the slave controllers is as follows:
the main controller analyzes and processes data uploaded by each battery module, compiles instructions into messages, the messages pass through the carrier modules matched with the main controller, the messages are sent to the carrier modules matched with the sub controllers through power cables of the power circuit and heating cables of the heating circuit, and the messages are subjected to signal modulation through the carrier modules matched with the sub controllers and then are sent to the sub controllers.
In this embodiment, the slave controllers and the corresponding matched carrier modules all adopt an independent power supply mode, each slave controller and the corresponding matched carrier module are connected with the corresponding battery module through a direct-current voltage converter, and the slave controllers and the carrier modules arranged in the battery modules are powered by the voltage of the battery modules after being reduced.
Simultaneously, the high voltage cable passes through the direct voltage converter power supply and connects main control unit, and main control unit supplies power respectively and is connected with battery and machine that charges, and main control unit's power supply adopts the mode of being equipped with electricity, by 24V's battery power supply during the driving, by the machine that charges power supply during charging, and other times get the electricity and convert into the required voltage of main control unit through the high voltage cable and supply power to guarantee battery management system's normal operating, reduced low pressure pencil, saving cost to a certain extent.
The slave controllers are connected with the corresponding matched battery modules through the electric quantity balancing modules, and the problem that the states of charge among the battery modules are inconsistent is solved. As shown in fig. 3, the slave controller of each battery module has battery status monitoring and battery equalization control functions, can monitor the battery health status and the power consumption of the slave controller in real time, and the state of the battery module is uploaded to the main controller in a carrier communication mode, and after the main controller analyzes and processes the data, the main controller sends the electric quantity value to be adjusted to each battery module, the slave controller periodically starts the electric quantity balancing module of the corresponding battery module, the state of charge of the battery modules is regularly adjusted, the consistency of the state of charge of the batteries of the whole battery management system is ensured, and the problem of inconsistent state of charge among the battery modules in the battery management system caused by different battery numbers of single battery modules or different power consumptions of single slave controllers is solved.
The electric quantity equalization process of the electric quantity equalization module comprises the following steps: when the electric quantity value to be adjusted is received from the controller and is smaller than the electric quantity in the corresponding battery module, the electric quantity consumption element (such as a resistor) is adopted to consume the redundant electric quantity, and when the electric quantity value to be adjusted is larger than the electric quantity in the corresponding battery module, the corresponding battery module is charged to supplement the missing electric quantity.
According to the battery management system, high-voltage carrier communication is realized, namely, information to be uploaded by each slave controller is transmitted to the master controller through the high-voltage cable by the carrier module, and information to be issued by the master controller is transmitted to each slave controller through the carrier module, so that the data transmission rate is improved, the real-time performance of data transmission is guaranteed, the communication failure rate of the battery management system is reduced, and the reliability of the whole vehicle is improved. In addition, because a communication cable (low-voltage wire harness) used between the battery modules in the battery management system is eliminated, the connection of the wire harness is reduced, the material cost is reduced, the supply period of parts is shortened, the field assembly efficiency is improved, and the economic cost is saved.
The invention also provides a new energy automobile which comprises the battery management system in the embodiment, and the description of the battery management system is clear and complete enough, so that the detailed description is omitted.
The above carrier communication using the power cable in the power circuit and the heating cable in the heating circuit is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and it will be apparent to those skilled in the art that the present invention may be modified and changed in various ways, for example, only one kind of high voltage cable (power cable or heating cable) is used for carrier communication. Therefore, any modification, equivalent replacement, improvement or the like made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (10)
1. A battery management system comprises a master controller and slave controllers, wherein each slave controller is used for detecting a battery module corresponding to control connection; each slave controller is used for transmitting the information of the corresponding battery module to the high-voltage cable through the corresponding matched carrier module;
the main controller is connected with the signal interface of the corresponding matched carrier module, and the power line coupling interface of the corresponding matched carrier module is connected to the high-voltage cable in the battery management system and used for receiving control information uploaded by each slave controller in the high-voltage cable through the corresponding matched carrier module.
2. The battery management system of claim 1, wherein the master controller is configured to transmit the detection and control information of the corresponding battery module to the high-voltage cable, and each slave controller is configured to receive the control information of the corresponding battery module issued by the master controller in the high-voltage cable through the corresponding matched carrier module.
3. The battery management system according to claim 1 or 2, wherein each slave controller and the corresponding matched carrier module are connected with the corresponding battery module through a direct-current voltage converter.
4. The battery management system according to claim 1 or 2, wherein the high voltage cable is connected to the main controller through a dc voltage converter, and the main controller is connected to a storage battery and a charger, respectively.
5. The battery management system of claim 1, wherein each slave controller is connected to a corresponding matched battery module through a power equalization module.
6. A new energy automobile comprises a battery management system, wherein the battery management system comprises a master controller and slave controllers, and each slave controller is used for detecting a battery module corresponding to control connection; each slave controller is used for transmitting the information of the corresponding battery module to the high-voltage cable through the corresponding matched carrier module;
the main controller is connected with the signal interface of the corresponding matched carrier module, and the power line coupling interface of the corresponding matched carrier module is connected to the high-voltage cable in the battery management system and used for receiving control information uploaded by each slave controller in the high-voltage cable through the corresponding matched carrier module.
7. The new energy automobile of claim 6, wherein the master controller is configured to transmit detection and control information of the corresponding battery module to the high-voltage cable, and each slave controller is configured to receive the control information of the corresponding battery module issued by the master controller in the high-voltage cable through the corresponding matched carrier module.
8. The new energy automobile as claimed in claim 6 or 7, wherein each slave controller and the corresponding matched carrier module are connected with the corresponding battery module through a direct-current voltage converter.
9. The new energy automobile according to claim 6 or 7, wherein the high-voltage cable is connected with the main controller through a direct-current voltage converter in a power supply mode, and the main controller is connected with a storage battery and a charger respectively.
10. The new energy automobile of claim 6, wherein each slave controller is connected with the corresponding matched battery module through the electric quantity balancing module.
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| CN201811173262.2A CN111098752A (en) | 2018-10-09 | 2018-10-09 | Battery management system and new energy automobile |
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| CN201811173262.2A CN111098752A (en) | 2018-10-09 | 2018-10-09 | Battery management system and new energy automobile |
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