CN111775769B - Battery management system and method - Google Patents
Battery management system and method Download PDFInfo
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- CN111775769B CN111775769B CN202010600616.8A CN202010600616A CN111775769B CN 111775769 B CN111775769 B CN 111775769B CN 202010600616 A CN202010600616 A CN 202010600616A CN 111775769 B CN111775769 B CN 111775769B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
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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
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Abstract
The invention provides a battery management system and a method, wherein a central control unit is connected with a head battery management chip and a tail battery management chip through an analysis chip, so that the central control unit can communicate with the battery management chips from the head direction and the tail direction in a normal state, the voltage difference of a battery monomer and a battery module caused by communication power consumption is greatly improved compared with a one-way daisy chain communication system, meanwhile, data acquired from the two directions can be mutually verified, and the reliability of the data is improved.
Description
Technical Field
The invention relates to the technical field of automobiles, in particular to a battery management system and a battery management method.
Background
With the rapid development of new energy electric vehicle technology, a Battery Management System (BMS) plays an increasingly important role as one of core technologies.
The battery management system in the current market is mainly of a master-slave structure, and the communication mode in the battery management system of the master-slave structure is mainly a CAN communication mode or a daisy chain communication mode. CAN communication is highly reliable, but is generally expensive due to the isolation design. Daisy chain communication is relatively inexpensive and is currently used in more and more applications. Because the daisy chain communication structure adopts a cascading mode, once the traditional one-way daisy chain has faults such as chip failure or communication harness disconnection, the communication of the system is interrupted, and the battery management system cannot acquire the data information of the high-voltage battery, thereby affecting the safety of the system.
The transmission mode of the daisy chain communication signal is mainly divided into a direct connection mode and a relay mode. The direct connection type communication mode is that all communication nodes are directly connected in series, the communication nodes only detect received signals and then respond, the signals cannot be enhanced, the amplitude of the communication signals can be gradually reduced along with the increase of the number of the used nodes, and therefore the anti-interference performance of the system is poor. The relay type communication mode is that the communication node processes the received signal and then retransmits the signal to the next communication node, so that the strength of the signal is enhanced, the communication length is theoretically not influenced by the number of the nodes, and the anti-interference performance is better, so that the daisy chain basically adopts a relay mode to transmit the signal at present. In a traditional one-way daisy chain communication structure, nodes at different positions need different relaying times, and because the relaying mode needs different current consumption, the current consumption of a battery module is different, and finally the difference of the voltages of battery cells is caused.
Disclosure of Invention
It is an object of the present invention to provide a battery management system to address one or more of the problems of the prior art.
To solve the above technical problem, the present invention provides a battery management system, including: the system comprises a central control unit, an analysis chip, a battery management chip and an isolation circuit; wherein the content of the first and second substances,
the number of the battery management chips is n, and the n battery management chips are sequentially connected in a daisy chain manner; the adjacent battery management chips, the analysis chip and the first battery management chip, and the analysis chip and the nth battery management chip are respectively connected through the isolation circuit, wherein n is an integer greater than or equal to 2;
the central control unit is respectively connected with the first battery management chip and the nth battery management chip through the analysis chip so as to form a first data transmission path and a second data transmission path between the central control unit and each battery management chip;
the analysis chip is used for transmitting data between the central control unit and each battery management chip.
Optionally, in the battery management system, the battery management system further includes: a wake-up circuit and a first power supply;
the analysis chip is connected with the wake-up circuit and is used for triggering the wake-up circuit to send a wake-up signal to the first power supply if a fault signal sent by the battery management chip is received when the first power supply is in a dormant state;
the first power supply is connected with the central control unit, is used for supplying power to the central control unit and enters a sleep mode when receiving a sleep command from the central control unit; the first power supply is also connected with the wake-up circuit and used for entering a working mode if the wake-up signal is received when the first power supply is in a sleep mode.
Optionally, in the battery management system, the analysis chip has an interrupt pin, and the analysis chip inverts a level of the interrupt pin when receiving the fault signal to trigger the wake-up circuit to send the wake-up signal.
Optionally, in the battery management system, the battery management system further includes: and the second power supply is used for supplying power to the analysis chip uninterruptedly.
Optionally, in the battery management system, the second power supply includes a low dropout regulator.
Optionally, in the battery management system, the analysis chip converts the SPI signal sent by the central control unit into a daisy chain communication signal recognizable by each battery management chip, and converts the daisy chain communication signal sent by the battery management chip into an SPI signal recognizable by the central control unit, so as to transmit data between the central control unit and each battery management chip.
Optionally, in the battery management system, the daisy chain communication signal sent by the battery management chip includes a differential signal.
Optionally, in the battery management system, the isolation circuit includes a transformer or a capacitor.
Optionally, in the battery management system, the analysis chip includes a first analysis chip and a second analysis chip, the central control unit is connected to the first battery management chip through the first analysis chip, the central control unit is connected to the nth battery management chip through the second analysis chip, and the first analysis chip and the second analysis chip are both used for data transmission between the central control unit and each battery management chip.
Based on the same idea, the present invention further provides a method for battery management by using the battery management system, comprising:
when the link formed by the n battery management chips is normally connected, the first communication path and the second communication path are periodically switched to transmit data between the central control unit and each battery management chip.
Optionally, in the method for performing battery management, the method for performing battery management further includes:
when a link formed by the n battery management chips is interrupted, the first communication path and the second communication path are adopted at the same time to transmit data between the central control unit and each battery management chip.
Compared with the prior art, the battery management system and the battery management method have the following beneficial effects:
according to the battery management system and method provided by the invention, the central control unit is connected with the head and tail battery management chips through the analysis chip, so that the central control unit can be communicated with the battery management chips from the head and tail directions in a normal state, the voltage difference of a battery monomer and a battery module caused by communication power consumption is greatly improved compared with a one-way daisy chain communication system, meanwhile, data acquired from the two directions can be mutually verified, and the reliability of the data is improved.
Furthermore, when communication interruption faults caused by faults such as battery management chip failure, isolation circuit failure and communication harness disconnection occur, the battery management system and the method can reestablish communication links with the battery management chips at two ends of a fault position from two directions respectively to perform data transmission, and robustness and safety of the system are improved.
Drawings
Fig. 1 is a schematic structural diagram of a battery management system according to an embodiment of the present invention.
Detailed Description
The battery management system and method according to the present invention will be described in detail with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention. Further, the structures illustrated in the drawings are often part of actual structures. In particular, the drawings may have different emphasis points and may sometimes be scaled differently.
As described above, in the conventional unidirectional daisy chain communication structure, the nodes at different positions need to be relayed for different times, and the relay method needs to consume current, so that the current consumption of the battery module is different, and finally the voltage of the battery cells is different.
In view of the above, the present embodiment provides a battery management system capable of bidirectional communication. As shown in fig. 1, the battery management system provided in the present embodiment includes: the device comprises a central control unit (MCU), an analysis chip, a battery management chip and an isolation circuit.
The number of the battery management chips is n, and n is a positive integer greater than or equal to 2. The battery management chip is used for correspondingly acquiring the voltage of the battery monomer, acquiring the temperature signal of the battery module, executing battery equalization and the like according to the instruction sent by the central control unit, and returning relevant data to the central control unit. The n battery management chips are sequentially connected in a daisy chain manner, that is, the communication interfaces of the n battery management chips are sequentially connected to the nth node from the 1 st node in a cascade manner.
The number of the isolation circuits is also n, and the isolation circuits are sequentially arranged as follows: isolation circuit 1, isolation circuit 2, isolation circuit n. The adjacent battery management chips, the analysis chip and the first battery management chip (battery management chip 1), and the analysis chip and the nth battery management chip (battery management chip n) are respectively connected through the isolation circuit. The isolation circuit is used for realizing the electrical isolation between the battery management chip nodes and between the battery management chip and the analysis chip. The isolation circuit may be implemented by a transformer or a capacitive scheme.
The central control unit is responsible for data processing and command issuing of the whole battery management system, and the central control unit is respectively connected with the battery management chip 1 and the battery management chip n through the analysis chip to form a first data transmission path and a second data transmission path between the central control unit and each battery management chip.
The cruising ability is an important parameter for reflecting the performance of the electric automobile, and the quiescent current consumption of the controller is reduced as much as possible when the vehicle is not used, so that the battery management controller is usually set to enter a sleep mode when the vehicle is not operated, so as to reduce the energy consumption of a battery management system on a high-voltage power battery and a vehicle-mounted low-voltage storage battery. The battery management system loses the monitoring of the state of the high-voltage battery under the dormant mode, and if faults such as undervoltage, overvoltage and overtemperature occur to the high-voltage battery module at the moment, the battery management system cannot know the faults, so that potential safety hazards exist.
In view of this, preferably, the battery management system provided in this embodiment further includes: a wake-up circuit and a first power supply (power supply 1). The wake-up circuit is configured to send a wake-up signal to the power supply 1, so that the power supply 1 enters the operating mode from the sleep mode. The analysis chip is respectively connected with the wake-up circuit and used for triggering the wake-up circuit to send out a wake-up signal if receiving a fault signal sent by the battery management chip when the power supply 1 is in a dormant state. The power supply 1 is connected with the central control unit, is used for supplying power to the central control unit and enters a sleep mode when receiving a sleep command from the central control unit; the power supply 1 is further connected with the wake-up circuit and is used for entering a working mode if receiving the wake-up signal when the power supply is in a sleep mode, and supplying power to the central control unit so as to wake up the central control unit. Namely, the power supply 1 has a watchdog function, and performs real-time monitoring with the central control unit, thereby improving system safety. The input end of the power supply 1 can be connected with a vehicle-mounted 12V storage battery.
In this embodiment, the parsing chip is in a normal power supply mode, and the battery management system further includes: and the output end of the power supply 2 is connected with the analysis chip, and the connection analysis chip 1 and the analysis chip 2 are supplied with power uninterruptedly, so that the analysis chip 1 and the analysis chip 2 can work when the central control unit is in a non-power supply state, and a fault signal sent by the battery management chip can be converted into a wake-up signal to be sent to the power supply 1 in time. Preferably, the power supply 2 comprises a low dropout linear regulator (LDO). The input end of the power supply 2 can be connected with a vehicle-mounted 12V storage battery.
The central control unit, the analysis chip, the battery management chip and the power supply 1 are respectively provided with corresponding interfaces and/or pins for connection and/or data transmission. The method comprises the following specific steps:
the central processing unit is provided with a power supply pin and an SPI interface; the analysis chip is provided with an SPI interface, a daisy chain interface, a communication interface, a power supply pin and an interrupt pin; the power supply 1 has a wake-up pin; the battery management chip is provided with a communication interface. The analysis chip and the battery management chip are respectively provided with at least two communication interfaces, and when one of the communication interfaces is a communication input interface, the other communication interface is a communication output interface.
Wherein, the power pin of the central control unit is connected with a power supply 1. The two groups of SPI interfaces of the central control unit are respectively connected with the two groups of SPI interfaces of the analysis chip, and the two groups of daisy chain communication interfaces of the analysis chip are respectively connected with the daisy chain communication interfaces of the battery management chip 1 and the battery management chip n, so that the first data transmission path and the second data transmission path are established. The analysis chip converts the SPI signal sent by the central control unit into a daisy chain communication signal which can be identified by each battery management chip and converts the daisy chain communication signal sent by the battery management chip into the SPI signal which can be identified by the central control unit so as to transmit data between the central control unit and each battery management chip. Further, the daisy chain communication signal sent by the battery management chip is usually a differential signal.
The interrupt pin of the analysis chip is connected with the input end of the wake-up circuit, the analysis chip turns over the level of the interrupt pin when receiving the fault signal, the output end of the wake-up circuit is connected with the wake-up pin of the power supply 1, and after the interrupt pin of the analysis chip turns over the level, the wake-up circuit processes and converts the level signal after the interrupt pin turns over to become a wake-up signal which can be identified by the power supply 1, so that the power supply 1 is wakened up.
In addition, one end of the isolation circuit 1 is connected with the communication interface of the analysis chip, the other end of the isolation circuit is connected with the through interface of the battery management chip 1, two ends from the isolation circuit 2 to the isolation circuit n-1 are connected with the communication interface of the adjacent battery management chip, one end of the isolation circuit n is connected with the communication interface of the analysis chip, and the other end of the isolation circuit n is connected with the communication interface of the battery management chip n.
In consideration of the fact that the number of the interfaces of the analysis chip is large in the actual process, the operation is not easy, and the difficulty of data processing is considered, in this embodiment, the number of the analysis chips may be 2, which are the analysis chip 1 and the analysis chip 2, respectively, and both the analysis chip 1 and the analysis chip 2 are used for data transmission between the central control unit and each of the battery management chips. The central control unit is connected with the battery management chip 1 through the first analysis chip, and the central control unit is connected with the battery management chip n through the second analysis chip. Namely, the first data transmission path and the second data transmission path are respectively established through the analysis chip 1 and the analysis chip 2, and a wake-up signal is sent to the wake-up circuit.
The analysis chip 1 and the analysis chip 2 are respectively provided with an SPI (serial peripheral interface), a daisy chain interface, a communication interface, a power supply pin and an interrupt pin, specifically, the SPI of the analysis chip 1 is connected with a group of SPI interfaces of the central control unit, and the daisy chain communication interface of the analysis chip 1 is connected with the communication interface of the battery management chip 1 through an isolation circuit; the SPI interface of the analysis chip 2 is connected with the other group of SPI interfaces of the central control unit, and the daisy chain communication interface of the analysis chip 2 is connected with the communication interface of the battery management chip n through an isolation circuit; the analysis chip 1 and the analysis chip 2 respectively convert SPI signals sent by the central control unit into daisy chain communication signals which can be identified by the battery management chip, and simultaneously can convert communication signals sent by the battery management chip into SPI signals to be sent to the central control unit to complete information interaction. In addition, the interrupt pins of the analysis chip 1 and the analysis chip 2 are connected with the input end of the wake-up circuit.
To more clearly illustrate the embodiment of the present invention, the following description will be made of a bidirectional communication link of the battery management system provided in the present embodiment. For convenience of description, the following description will be made with the number of the parsing chips being 2 when describing the battery management system provided in the present embodiment. However, it should be understood that the present application is not limited to the number of the analysis chips 2, and the analysis chip 1 and the analysis chip 2 may be integrated into a whole, and the corresponding interfaces may be separately provided.
One path for data transmission between the central control unit and the battery management chip is: a group of SPI interfaces of the central control unit are connected with an SPI interface of an analysis chip 1, a communication output port of the analysis chip 1 is connected with one end of an isolation circuit, the other end of the isolation circuit is connected with a communication input port of a battery management chip 1, the SPI signals sent by the central control unit are converted into differential signals which can be identified by the battery management chip 1 through the analysis chip 1, the differential signals are sent to the battery management chip 1 through the isolation of the isolation circuit, the signals are sent from the communication output port through the battery management chip 1 in a relay mode, the differential signals are sent to a battery management chip 2 through the isolation of the isolation circuit, and the like, the signals are always sent to a battery management chip n. It should be noted that both the communication input port and the communication output port of the battery management chip can receive and transmit signals, so when the battery management chip needs to return data to the central control unit, the battery management chip sends a signal through the communication input port, the signal is sent to the communication output port of the previous battery management chip after passing through the isolation circuit, then the signal is sequentially relayed and forwarded to the analysis chip 1, and the analysis chip 1 converts the differential communication signal returned by the battery management chip into an SPI signal and sends the SPI signal to the central control unit for processing.
The other path of data transmission between the central control unit and the battery management chip is as follows: another group of SPI interface of the central control unit is connected with SPI interface of the analysis chip 2, communication output interface of the analysis chip 2 is connected with one end of the isolation circuit, the other end of the isolation circuit is connected with communication output port of the battery management chip n, the SPI signal sent by the central control unit is converted into differential signal which can be identified by the battery management chip by the analysis chip 2, and the differential signal is sent to the battery management chip n after the isolation of the isolation circuit, the signal is sent from the communication input port by the battery management chip n in a relay mode, and the differential signal is sent to the battery management chip n-1 after the isolation of the isolation circuit, and so on, the signal is sent to the battery management chip 1 all the time. Similarly, the analysis chip 2 can convert the differential communication signal returned by the battery management chip into an SPI signal and send the SPI signal to the central control unit for processing.
Since the battery management chip transmits the communication signal in a relay manner, for the communication system with the cascade structure, if the data transmission between the central control unit and the battery management chip is performed according to the first communication path, the battery management chip 1 needs to relay and forward the data for the most times, so that the consumed power is the largest, the battery management chip n has the least number of relay and forwarding times, and the consumed power is the smallest. Similarly, if the data transmission between the central control unit and the battery management chip is performed according to the second communication path, the battery management chip n needs to relay the data the most, so that the power consumed by the battery management chip n is the largest, and the battery management chip 1 relays the least, and consumes the least power. And the battery management chip is usually by the direct power supply of high-voltage battery module, and the consumption of the high-voltage battery module of difference can be different like this, can lead to the voltage difference grow between the battery module, finally leads to the free inconsistency increase of battery, has reduced the life-span and the duration of a journey ability of battery, can bring the potential safety hazard even.
In view of this, based on the battery management system provided in this embodiment, this embodiment further provides a battery management method, including:
when the link formed by the n battery management chips is normally connected, the first communication path and the second communication path are periodically switched to transmit data between the central control unit and each battery management chip.
The first communication path and the second communication path can be periodically switched between the central control unit and the battery management chips for communication, so that the power consumption of each battery management chip is the same, the power consumption difference of the battery is greatly improved, and further, the method has the other advantage that the central control unit carries out data transmission with the battery management chips from two directions, data verification can be carried out, and the reliability of the data is improved.
Because daisy chain communication adopts a cascade mode for communication, data transmission between the central control unit and the battery management chip is carried out according to the first communication path or the second communication path, when the communication link is interrupted and fails, the central control unit cannot acquire data of a battery management chip node behind a failure position, even normal communication of a node in front of the failure position is influenced, a system cannot acquire the data, and the safety state is unknown. The reasons caused by the communication interruption failure comprise failure of a certain battery management chip, failure of an isolation circuit, disconnection of a communication wire harness, interference on a communication signal and the like.
In view of this, based on the battery management system provided in this embodiment, the method for managing a battery provided in this embodiment may further include:
when a link formed by the n battery management chips is interrupted, the first communication path and the second communication path are adopted at the same time to transmit data between the central control unit and each battery management chip.
For example, the following steps are carried out: assuming that the communication harness between the battery management chip 2 and the battery management chip 3 is disconnected, the central control unit initializes the battery management chips 1 and 2 by the parsing chip 1, reallocates an address, and then performs data interaction, and the central control unit initializes the battery management chip n up to the battery management chip 3 by the parsing chip 2, reallocates an address, and then performs data interaction. It should be noted that at this time, data interaction between the battery management chip and the central control unit can only be transmitted according to a certain path, the node before the communication failure position can only transmit data through the first communication path, and the node after the communication failure position can only transmit data through the second communication path.
The process of executing the battery management method by the battery management system provided by the embodiment is roughly as follows:
the input end of the power supply 1 is connected with the vehicle-mounted 12V storage battery, the output end of the power supply 1 is connected with the power supply pins of the analysis chips 1 and 2, the analysis chips 1 and 2 are in a normal power supply mode, the input end of the power supply 2 is connected with the vehicle-mounted 12V storage battery, the output end of the power supply 2 is connected with the power supply pin of the central control unit and provides power for the central control unit, the power supply 2 is provided with a wake-up pin and is connected with the output end of the wake-up circuit, the wake-up circuit outputs a high-level signal to wake up the power supply 2 in a dormant state, so that the normal output power supplies power for the central control unit, the two input ends of the wake-up circuit are connected with the interrupt signal pins of the analysis chip 1 and the analysis chip 2, and interrupt signals sent by the analysis chips 1 and 2 are converted into wake-up signals which can be identified by the power supply 2 through the wake-up circuit. In order to reduce the energy consumption of the low-voltage battery and the high-voltage battery system when the vehicle is not in use, the entire battery management system is usually set to enter a sleep mode, at this time, the output of the power supply 1 is normal, and the power supply is provided for the analysis chips 1 and 2, it should be noted that since the analysis chips 1 and 2 are in the sleep mode, the current consumption of the system is very small at this time. When faults such as overvoltage, undervoltage and overtemperature occur to a battery monomer or a battery module, a battery management chip corresponding to a fault position can be awakened, the battery management chip transmits a fault signal to a battery management chip of an adjacent node through a communication loop, the battery management chip of the adjacent node detects that the fault awakening signal can be awakened, then the fault signal is continuously transmitted downwards until the fault signal is transmitted to an analysis chip 1 or an analysis chip 2, the analysis chip can be awakened after detecting the fault signal, the level of an interrupt signal pin is overturned at the same time, after the awakening circuit detects that the level of any interrupt pin signal is overturned, a high-level awakening signal is sent through an output pin to awaken a power supply 2, the output voltage of the power supply 2 provides power for a central control unit, and the whole system is awakened. It should be noted that, after detecting a fault signal, the battery management chip sends the fault signal from both the communication input port and the communication output port, so that even if a disconnection fault occurs at a certain position in the whole communication loop, the fault signal can be transmitted to the analysis chip along the other direction, thereby waking up the whole battery management system.
In summary, the battery management system provided in this embodiment is a battery management system with bidirectional communication and wake-up functions, and compared with the prior art, has the following beneficial effects:
(1) under the normal state, the central control unit can communicate with the battery management chip from the head direction and the tail direction, and the voltage difference of the battery cells and the battery modules caused by communication power consumption is greatly improved compared with a one-way daisy chain communication system. Meanwhile, data acquired from two directions can be mutually verified, and the reliability of the data is improved.
(2) When communication interruption faults caused by faults of battery management chip failure, isolation circuit failure, communication harness disconnection and the like occur, communication connection can be reestablished with the battery management chips at two ends of a fault position from two directions respectively to perform data transmission, and robustness and safety of the system are improved.
(3) When faults such as overvoltage, undervoltage or over-temperature of the battery monomer or the battery module occur in the sleeping state of the system, the battery management system can be awakened in time. When the communication disconnection fault occurs at the same time, the system can still be awakened from the other direction, and the safety of the system is greatly improved.
The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.
Claims (8)
1. A battery management system, comprising: the system comprises a central control unit, an analysis chip, a battery management chip and an isolation circuit; wherein the content of the first and second substances,
the number of the battery management chips is n, and the n battery management chips are sequentially connected in a daisy chain manner; the adjacent battery management chips, the analysis chip and the first battery management chip, and the analysis chip and the nth battery management chip are respectively connected through the isolation circuit, wherein n is an integer greater than or equal to 2;
the central control unit is respectively connected with the first battery management chip and the nth battery management chip through the analysis chip so as to form a first data transmission path and a second data transmission path between the central control unit and each battery management chip;
the analysis chip is used for transmitting data between the central control unit and each battery management chip;
the battery management system further includes: a wake-up circuit and a first power supply;
the analysis chip is connected with the wake-up circuit and is used for triggering the wake-up circuit to send a wake-up signal to the first power supply if a fault signal sent by the battery management chip is received when the first power supply is in a dormant state;
the first power supply is connected with the central control unit, is used for supplying power to the central control unit and enters a sleep mode when receiving a sleep command from the central control unit; the first power supply is also connected with the wake-up circuit and is used for entering a working mode if the wake-up signal is received when the first power supply is in a sleep mode;
the battery management system further includes: and the second power supply is used for supplying power to the analysis chip uninterruptedly.
2. The battery management system according to claim 1, wherein the parsing chip has an interrupt pin and is connected to the wake-up circuit through the interrupt pin, and the parsing chip inverts a level of the interrupt pin after receiving the fault signal to trigger the wake-up circuit to send out the wake-up signal.
3. The battery management system of claim 2, wherein the second power source comprises a low dropout linear regulator.
4. The battery management system of claim 3, wherein the daisy-chain communication signals issued by the battery management chips comprise differential signals.
5. The battery management system of claim 1, wherein the isolation circuit comprises a transformer or a capacitor.
6. The battery management system according to claim 1, wherein the parsing chip includes a first parsing chip and a second parsing chip, the central control unit and a first one of the battery management chips are connected through the first parsing chip, the central control unit and an nth one of the battery management chips are connected through the second parsing chip, and both the first parsing chip and the second parsing chip are used for data transmission between the central control unit and each of the battery management chips.
7. A method for battery management by using the battery management system as claimed in any one of claims 1 to 6, comprising:
when the link formed by the n battery management chips is normally connected, the first communication path and the second communication path are periodically switched to transfer data between the central control unit and each battery management chip.
8. The method of battery management by a battery management system of claim 7, wherein the method of battery management further comprises:
when a link formed by the n battery management chips is interrupted, the first communication path and the second communication path are adopted at the same time to transmit data between the central control unit and each battery management chip.
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| CN202010600616.8A CN111775769B (en) | 2020-06-28 | 2020-06-28 | Battery management system and method |
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| CN202010600616.8A CN111775769B (en) | 2020-06-28 | 2020-06-28 | Battery management system and method |
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| CN111775769A CN111775769A (en) | 2020-10-16 |
| CN111775769B true CN111775769B (en) | 2022-04-08 |
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| CN112550067B (en) * | 2020-12-10 | 2022-10-04 | 上海金脉电子科技有限公司 | Vehicle BDU system |
| CN114714909A (en) * | 2021-01-05 | 2022-07-08 | 广汽埃安新能源汽车有限公司 | Power battery monitoring system and vehicle |
| CN113709155B (en) * | 2021-08-27 | 2023-07-14 | 苏州猛禽电子科技有限公司 | Battery module daisy chain communication conversion method, system and terminal |
| CN113921921A (en) * | 2021-09-29 | 2022-01-11 | 东莞新能安科技有限公司 | Battery module protection method, BMS system, battery cluster and electric device |
| CN114103726A (en) * | 2021-11-09 | 2022-03-01 | 联合汽车电子有限公司 | Battery management system and new energy vehicle |
| CN114528240A (en) * | 2022-01-25 | 2022-05-24 | 阳光储能技术有限公司 | Daisy chain communication control method and device |
| CN114755585A (en) * | 2022-04-07 | 2022-07-15 | 中国第一汽车股份有限公司 | Battery data processing method and system and vehicle |
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