CN113910980A - Battery cell fault monitoring system and method - Google Patents
Battery cell fault monitoring system and method Download PDFInfo
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- CN113910980A CN113910980A CN202111320703.9A CN202111320703A CN113910980A CN 113910980 A CN113910980 A CN 113910980A CN 202111320703 A CN202111320703 A CN 202111320703A CN 113910980 A CN113910980 A CN 113910980A
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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
- B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
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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
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
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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
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
- B60L3/0046—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
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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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- 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
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control parameters
- B60L2240/54—Drive Train control parameters related to batteries
- B60L2240/545—Temperature
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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
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control parameters
- B60L2240/54—Drive Train control parameters related to batteries
- B60L2240/547—Voltage
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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
Abstract
The invention provides a battery cell fault monitoring system and a battery cell fault monitoring method, wherein a sampling module monitors the state of a corresponding battery cell in real time when the battery cell is in a dormant state, and sends a fault signal when the battery cell is in a fault, the fault signal wakes up a bridging module and all sampling modules through an annular daisy chain formed by connecting the bridging module and a plurality of sampling modules, the bridging module wakes up a processing module, and the processing module can analyze and process the fault of the battery cell after being awakened. The invention can complete the fault detection and awakening of the cell fault monitoring system during dormancy through the annular daisy chain without complex circuit modules and components, and has the advantages of simple system, good reliability and low cost.
Description
Technical Field
The invention relates to the technical field of new energy batteries, in particular to a battery core fault monitoring system and a battery core fault monitoring method.
Background
New energy automobile's battery package is used for providing the drive electric energy for whole car, and the battery package is established ties by a plurality of battery module and is constituteed usually, contains a plurality of electric cores in every battery module again. When a battery core fails, for example, over-temperature, over-voltage or under-voltage, thermal runaway of a battery pack may occur, thereby causing accidents such as combustion, explosion, and personal injury. A Battery Management System (BMS) is built in the Battery pack, and the Battery Management System needs to continuously monitor the state of the Battery cell in real time, detect a Battery cell fault in time, and take corresponding measures, such as alarming, power limitation, high voltage reduction, heat dissipation and explosion prevention of the Battery cell. For the fault monitoring of the battery core, monitoring is needed not only when the battery management control system operates on line (vehicle starts), but also when the battery management control system is dormant (vehicle does not start). When the battery management control system operates on line, the state of the monitoring battery core can be analyzed and processed in real time, however, when the battery management control system is in a dormant state, how to monitor the state of the battery core and analyze and process faults is a problem to be solved urgently.
Disclosure of Invention
The invention aims to provide a battery cell fault monitoring system and a battery cell fault monitoring method, which can monitor the state of a battery cell in real time and wake up a processor to analyze and process faults in time when a battery management control system is dormant.
In order to achieve the above object, the present invention provides a battery cell fault monitoring system, which includes a processing module, a bridging module and a plurality of sampling modules, wherein the bridging module and the sampling modules are connected in a ring daisy chain;
when the battery cell fault monitoring system is in a dormant state, the sampling module monitors the state of the corresponding battery cell in real time, and sends a fault signal when the battery cell fails, the fault signal wakes up the bridging module and all the sampling modules through the annular daisy chain, the bridging module wakes up the processing module, and the processing module analyzes and processes the fault of the battery cell.
Optionally, the system further comprises a first power supply module, wherein the first power supply module is connected with the processing module and the bridge module;
the bridge module sends a wake-up signal to the first power supply module after being awakened, and the first power supply module supplies power to the processing module after receiving the wake-up signal so as to awaken the processing module.
Optionally, the bridge module further comprises a second power supply module, and the second power supply module is configured to continuously supply power to the bridge module.
Optionally, the fault of the battery cell includes an over-temperature fault, an over-voltage fault, an under-voltage fault, or a daisy chain communication line disconnection fault.
The invention also provides a method for monitoring the battery cell fault by using the battery cell fault monitoring system, which comprises the following steps:
when the battery cell fault monitoring system is in a dormant state, the sampling module monitors the state of the corresponding battery cell in real time and sends a fault signal when the battery cell fails;
the fault signal wakes up the bridging module through the annular daisy chain;
the bridge module wakes up the processing module and all the sampling modules; and the number of the first and second groups,
and the processing module analyzes and processes the faults of the battery core.
Optionally, the battery cell fault monitoring system further includes a first power supply module, the bridge module is connected to the first power supply module through a wake-up output line, the bridge module sends a wake-up signal to the first power supply module through the wake-up output line after being woken up, and the first power supply module supplies power to the processing module after receiving the wake-up signal to wake up the processing module;
the first power supply module receives the wake-up signal and then supplies power to the processing module so as to wake up the processing module; and the number of the first and second groups,
after the processing module is awakened, the bridge chip is triggered to send the awakening signal to the first power supply module through the awakening output line, the processing module collects signals on the awakening output line, and when the signals collected by the processing module are matched with the awakening signal, the awakening output line is judged to be normal.
Optionally, when both the signal acquired by the processing module and the wake-up signal are at a high level or at a low level, the signal acquired by the processing module is matched with the wake-up signal.
Optionally, after the processing module is awakened, the ring daisy chain is triggered to communicate along a first direction, and after the communication along the first direction is successful, the ring daisy chain is triggered to communicate along a second direction, and after the communication along the second direction is completed, it is determined that the ring daisy chain is normal.
Optionally, the sampling module monitors that the corresponding battery core sends the fault signal when the battery core is over-temperature, over-voltage or under-voltage.
Optionally, after the processing module is awakened, the over-temperature threshold, the over-voltage threshold, and the under-voltage threshold are written into each sampling module, the over-temperature threshold, the over-voltage threshold, and the under-voltage threshold written into each sampling module are read, and when the over-temperature threshold, the over-voltage threshold, and the under-voltage threshold written into each sampling module are the same as the read over-temperature threshold, the read over-voltage threshold, and the read under-voltage threshold are correspondingly written into each sampling module, it is determined that the sampling module is normal.
In the system and the method for monitoring the battery cell fault, the sampling modules monitor the state of the corresponding battery cell in real time when the battery cell is dormant, and send out fault signals when the battery cell is in fault, the fault signals wake up the bridging module and all the sampling modules through the annular daisy chain formed by connecting the bridging module and the sampling modules, the bridging module wakes up the processing module, and the processing module can analyze and process the fault of the battery cell after being woken up. The invention can complete the fault detection and awakening of the cell fault monitoring system during dormancy through the annular daisy chain without complex circuit modules and components, and has the advantages of simple system, good reliability and low cost.
Drawings
Fig. 1 is a schematic structural diagram of a cell fault monitoring system;
fig. 2 is a schematic structural diagram of a cell fault monitoring system according to an embodiment of the present invention;
fig. 3 is a flowchart of a battery cell fault monitoring method according to an embodiment of the present invention;
fig. 4 is a flowchart for determining whether a wake-up output line is normal according to an embodiment of the present invention;
fig. 5 is a flowchart illustrating determining whether the circular daisy chain is normal according to an embodiment of the present invention;
fig. 6 is a flowchart for determining whether a sampling module is normal according to an embodiment of the present invention;
wherein the reference numerals are:
10. 100-a sampling module; 20. 200-a battery module; 31. 310-a processing module; 32. 320-a bridge module; 330-a power supply module; 33-a first power supply module; 34-a second power supply module; 400-a fault handling module; 500-isolation module.
Detailed Description
Fig. 1 is a schematic structural diagram of a cell fault monitoring system. As shown in fig. 1, the cell fault monitoring system includes a processing module 310, a power supply module 330, a fault processing module 400, a bridging module 320, a plurality of isolation modules 200, and a plurality of sampling modules 100. The bridge module 320 is connected with the sampling module 100 one by one through a daisy chain communication line. When a battery cell or a plurality of battery cells in the battery module 200 has a fault such as over-temperature, over-voltage or under-voltage, the sampling module 100 that detects the fault is awakened and outputs a fault signal, the fault signal is isolated by the corresponding isolation module 500, then summarized with other signals that are output by the sampling module 100 and isolated by the corresponding isolation module 500, and input into the fault processing module 400, the fault processing module 400 outputs an awakening signal to the power supply module 330, and the power supply module 330 supplies power to the processing module 310 so as to awaken the processing module 310. The battery core fault monitoring system needs more components and circuits, is relatively complex and relatively high in cost, and is relatively poor in reliability.
Based on this, this embodiment provides a system and a method for monitoring a cell fault, where a sampling module monitors a state of a corresponding cell in real time when the cell is in a sleep state, and sends a fault signal when the cell is in a fault, the fault signal wakes up the bridge module and all the sampling modules through an annular daisy chain formed by connecting the bridge module and a plurality of the sampling modules, the bridge module wakes up the processing module, and the processing module can analyze and process the fault of the cell after being woken up. The invention can complete the fault detection and awakening of the cell fault monitoring system during dormancy through the annular daisy chain without complex circuit modules and components, and has the advantages of simple system, good reliability and low cost.
The following describes in more detail embodiments of the present invention with reference to the schematic drawings. 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.
Fig. 2 is a block diagram of a structure of the battery cell fault monitoring system provided in this embodiment. As shown in fig. 2, the present embodiment provides a cell fault monitoring system, which includes a processing module 31, a bridging module 32, a first power supply module 33, a second power supply module 34, and a plurality of sampling modules 10. In this embodiment, the cell fault monitoring system is a Battery Management System (BMS) in a battery pack of a new energy vehicle, the sampling module 10 belongs to a module on a slave board (CMC) of the battery management system, and the processing module 31, the bridge module 32, the first power supply module 33, and the second power supply module 34 belong to modules on a main Board (BCU) of the battery management system. When the new energy automobile is powered off, the battery core fault monitoring system also enters a sleep state, and at the moment, the mainboard and the slave board are both in the sleep state, namely: the processing module 31, the bridging module 32, the first power supply module 33, the second power supply module 34 and the sampling modules 10 are all in a sleep state.
The sampling modules 10 may be any known sampling chip, such as an Analog Front End (AFE), and each of the sampling modules 10 may monitor the states of all the cells in one of the battery modules 20 in the battery pack. Fig. 1 shows 4 battery modules 20 and two slave boards adaptively, each slave board has two sampling modules 10, and a total of 4 sampling modules 10, and one sampling module 10 monitors the states of all the cells in one battery module 20. It should be understood that the number of the battery modules 20 and the slave plates is not limited thereto, and may be 1, 3, 5, or 6, etc.; each slave board is not limited to include two sampling modules 10, and may include 1, 3, 4, or 5, and so on, which are not illustrated herein.
Further, the sampling module 10 may also monitor the states of all the battery cells in the corresponding battery module 20 in real time during the sleep. Specifically, the sampling module 10 enters a sleep mode when in sleep, in the sleep mode, the sampling module 10 may acquire voltages and module temperatures of all battery cells in the corresponding battery module 20 in real time, compare the acquired temperatures with a preset over-temperature threshold value, and compare the acquired voltages with a preset over-voltage threshold value and an under-voltage threshold value, and when the temperature acquired by the sampling module 10 is greater than the over-temperature threshold value, it indicates that an over-temperature fault occurs in the battery cell; when the voltage of any one of the battery cells acquired by the sampling module 10 is greater than the overvoltage threshold, it indicates that an overvoltage fault occurs in the battery cell; when the voltage of any one of the battery cells acquired by the sampling module 10 is smaller than the undervoltage threshold, it indicates that an undervoltage fault occurs in the battery cell. When the battery core has an over-temperature fault, an over-voltage fault, an under-voltage fault or a disconnection fault of the daisy chain communication line, the sampling module 10 which monitors the fault sends out a fault signal.
The bridge module 32 is connected to a plurality of the sampling modules 10 in a ring daisy chain, and the bridge module 32 is connected to the second power supply module 34, and the second power supply module 34 can continuously supply power to the bridge module 32 (including when the cell failure monitoring system is in a sleep state). As such, the bridge module 32 and the sampling module 10 may communicate via a daisy chain communication at any time. When the sampling module 10 sends out the fault signal, since the bridge module 32 is connected to a plurality of the sampling modules 10 in a ring daisy chain, the fault signal is transmitted to the bridge module 32 and all the sampling modules 10 through the ring daisy chain, so that the bridge module 32 and all the sampling modules 10 can be woken up.
Referring to fig. 1, the bridge module 32 is electrically connected to the first power supply module 33, the first power supply module 33 is electrically connected to the processing module 31, when the bridge module 32 is awakened, a wake-up signal is sent to the first power supply module 33 to wake up the first power supply module 33, and after the first power supply module 33 is awakened, the processing module 31 is powered up to wake up the processing module 31.
In this embodiment, the bridge module 32 is electrically connected to the first power supply module 33 through a wake-up output line, and when the bridge module 32 sends the wake-up signal to the first power supply module 33, the wake-up signal is sent to the first power supply module 33 through the wake-up output line. In addition, the processing module 31 is further connected to the bridge module 32 through a trigger output line, and is configured to send a trigger signal to the bridge module 32 through the trigger output line.
After the processing module 31 is awakened, the main board and the slave board are both awakened, and at this time, the main board and the slave board may initialize and start normal operation, so as to analyze and process the fault of the battery cell.
Based on this, the present embodiment further provides a method for monitoring a cell fault by using the cell fault monitoring system, and fig. 1 is a flowchart of the method for monitoring a cell fault provided in the present embodiment. As shown in fig. 1, the cell fault monitoring method includes:
step S100: when the battery cell fault monitoring system is in a dormant state, the sampling module 10 monitors the state of the corresponding battery cell in real time and sends a fault signal when the battery cell fails;
step S200: the fault signal wakes up the bridge module 32 and all the sampling modules 10 through the annular daisy chain;
step S300: the bridge module 32 wakes up the processing module 31; and the number of the first and second groups,
step S400: the processing module 31 analyzes and processes the faults of the battery cells.
Specifically, step S100 is executed first, when the cell fault monitoring system is in a sleep state, the sampling module 10 monitors states of all the cells in the corresponding battery module 20 in real time, and when the sampling module 10 finds that a fault occurs in the cell, such as an over-temperature fault, an over-voltage fault, or an under-voltage fault, the sampling module will send the fault signal.
Step S200 is executed, and the fault signal is transmitted to the bridge module 32 and all the sampling modules 10 through the circular daisy chain, so as to wake up the bridge module 32 and all the sampling modules 10.
Step S300 is executed, in which the bridge module 32 sends a wake-up signal to the first power supply module 33, and the first power supply module 33 is woken up after receiving the wake-up signal and starts to supply power to the processing module 31 to wake up the processing module 31. The processing module 31 starts to operate and initialize after being awakened, and at the same time, the bridge module 32 and the sampling module 10 start to initialize.
Step S400 is executed, and the processing module 31 may analyze and process the fault of the battery cell. For example, the processing module 31 may instruct the sampling module 10 to re-collect the temperature and voltage of the battery cell, and thus determine that the fault signal is enough to be a false alarm; when it is determined that the battery cell does have a fault, corresponding measures may be taken, for example, an alarm signal may be sent to a bus, the power and the lower high voltage of the battery cell may be limited, and the battery cell may be cooled; when it is determined that the fault signal is false alarm, the electric core has no fault, and the processing module 31 may power down and return to the sleep state again.
Further, after the processing module 31 is awakened every time, the fault diagnosis function of the battery cell fault monitoring system can be checked, so that problems can be found conveniently and timely, and the safety performance of the whole vehicle is improved.
Specifically, first, the processing module 31 may send a first trigger signal to the bridge module 32 through the trigger output line, so as to trigger the bridge module 32 to send the wake-up signal to the first power supply module 33. Then, the processing module 31 may collect the signal on the wake-up output line, and when the signal collected by the processing module 31 matches the wake-up signal, it is determined that the wake-up output line is normal; on the contrary, when the signal collected by the processing module 31 does not match the wake-up signal, it is determined that the wake-up output line has a fault.
For example, the wake-up signal is a high level signal, and when the signal acquired by the processing module 31 is also a high level, it indicates that the wake-up output line is normal; on the contrary, when the signal collected by the processing module 31 is at a low level, it indicates that the wake-up output line has a fault. Certainly, the wake-up signal may also be a low level signal, and at this time, when the signal acquired by the processing module 31 is also a low level, it indicates that the wake-up output line is normal; on the contrary, when the signal collected by the processing module 31 is at a high level, it indicates that the wake-up output line has a fault.
Next, the processing module 31 may send a second trigger signal to the bridge module 32 through the trigger output line, so as to trigger the ring daisy chain to communicate in the first direction. After the communication in the first direction is successful, a certain time may be delayed to send a third trigger signal to the bridge module 32, triggering the ring daisy chain to communicate in the second direction. When the communication in the second direction is successful, the annular daisy chain can be judged to be normal; on the contrary, if the communication in the first direction is not successful and/or the communication in the second direction is not successful, it can be determined that the ring daisy chain has a failure.
The first direction is opposite to the second direction, for example, but not limited to, the first direction is a forward direction of the circular daisy chain, and the second direction is a reverse direction of the circular daisy chain.
Further, the processing module 31 may also write an over-temperature threshold, an over-voltage threshold, and an under-voltage threshold into each sampling module 10, and read the over-temperature threshold, the over-voltage threshold, and the under-voltage threshold written in each sampling module 10; when the over-temperature threshold, the over-voltage threshold and the under-voltage threshold written in and read out by each sampling module 10 are respectively the same, it can be determined that the sampling module 10 is normal in writing; on the contrary, when the over-temperature threshold, the over-voltage threshold, and the under-voltage threshold written in by a certain sampling module 10 are different from any one of the read over-temperature threshold, the read over-voltage threshold, and the read under-voltage threshold, it can be determined that the sampling module 10 has a fault.
When the wake-up output line, the annular daisy chain, and the sampling module 10 are all normal, it may be determined that the fault diagnosis function of the battery cell fault monitoring system is normal, and a fault wake-up function in a sleep state may be enabled. It should be appreciated that even if the wake-up output line, the daisy chain, or the sampling module 10 fails, it can be discovered in time, improving the safety of the entire vehicle.
In summary, in the system and the method for monitoring a cell fault provided in the embodiments of the present invention, the sampling modules monitor the state of the corresponding cell in real time when the cell is in a sleep state, and send out a fault signal when the cell is in a fault, the fault signal wakes up the bridge module and all the sampling modules through the daisy chain of the bridge module and the sampling modules, the bridge module wakes up the processing module, and the processing module can analyze and process the fault of the cell after being woken up. The invention can complete the fault detection and awakening of the cell fault monitoring system during dormancy through the annular daisy chain without complex circuit modules and components, and has the advantages of simple system, good reliability and low cost.
The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any way. It will be understood by those skilled in the art that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A battery cell fault monitoring system is characterized by comprising a processing module, a bridging module and a plurality of sampling modules, wherein the bridging module and the sampling modules are connected into a ring-shaped daisy chain;
when the battery cell fault monitoring system is in a dormant state, the sampling module monitors the state of the corresponding battery cell in real time, and sends a fault signal when the battery cell fails, the fault signal wakes up the bridging module and all the sampling modules through the annular daisy chain, the bridging module wakes up the processing module, and the processing module analyzes and processes the fault of the battery cell.
2. The cell fault monitoring system of claim 1, further comprising a first power supply module, the first power supply module being connected to the processing module and the bridge module;
the bridge module sends a wake-up signal to the first power supply module after being awakened, and the first power supply module supplies power to the processing module after receiving the wake-up signal so as to awaken the processing module.
3. The cell fault monitoring system of claim 1, further comprising a second power supply module configured to continuously supply power to the bridge module.
4. The cell fault monitoring system of claim 1, wherein the fault of the cell comprises an over-temperature fault, an over-voltage fault, an under-voltage fault, or a daisy-chain communication line disconnection fault.
5. A method for monitoring cell fault by using the cell fault monitoring system according to any one of claims 1 to 4, wherein the method comprises the following steps:
when the battery cell fault monitoring system is in a dormant state, the sampling module monitors the state of the corresponding battery cell in real time and sends a fault signal when the battery cell fails;
the fault signal wakes up the bridging module and all the sampling modules through the annular daisy chain;
the bridge module wakes up the processing module; and the number of the first and second groups,
and the processing module analyzes and processes the faults of the battery core.
6. The cell fault monitoring method according to claim 5, wherein the cell fault monitoring system further includes a first power supply module, the bridge module is connected to the first power supply module through a wake-up output line, the bridge module sends a wake-up signal to the first power supply module through the wake-up output line after being woken up, and the first power supply module receives the wake-up signal and then supplies power to the processing module to wake up the processing module;
the first power supply module receives the wake-up signal and then supplies power to the processing module so as to wake up the processing module; and the number of the first and second groups,
after the processing module is awakened, the bridge chip is triggered to send the awakening signal to the first power supply module through the awakening output line, the processing module collects signals on the awakening output line, and when the signals collected by the processing module are matched with the awakening signal, the awakening output line is judged to be normal.
7. The battery cell fault monitoring method according to claim 6, wherein when both the signal acquired by the processing module and the wake-up signal are at a high level or at a low level, the signal acquired by the processing module is matched with the wake-up signal.
8. The cell fault monitoring method according to claim 5, wherein after the processing module is awakened, the ring daisy chain is triggered to communicate in a first direction, and after the communication in the first direction is successful, the ring daisy chain is triggered to communicate in a second direction, and after the communication in the second direction is completed, the ring daisy chain is determined to be normal.
9. The battery cell fault monitoring method of claim 5, wherein the sampling module monitors that the fault signal is sent out when the corresponding battery cell is over-temperature, over-voltage or under-voltage.
10. The battery cell fault monitoring method according to claim 5, wherein after the processing module is awakened, an over-temperature threshold, an over-voltage threshold, and an under-voltage threshold are written into each sampling module, the over-temperature threshold, the over-voltage threshold, and the under-voltage threshold written into each sampling module are read, and when the over-temperature threshold, the over-voltage threshold, and the under-voltage threshold written into each sampling module are the same as the read over-temperature threshold, the read over-voltage threshold, and the read under-voltage threshold, it is determined that the sampling module is normal.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111320703.9A CN113910980A (en) | 2021-11-09 | 2021-11-09 | Battery cell fault monitoring system and method |
| PCT/CN2022/116961 WO2023082793A1 (en) | 2021-11-09 | 2022-09-05 | Cell fault monitoring system and method |
Applications Claiming Priority (1)
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| CN202111320703.9A CN113910980A (en) | 2021-11-09 | 2021-11-09 | Battery cell fault monitoring system and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023082793A1 (en) * | 2021-11-09 | 2023-05-19 | 联合汽车电子有限公司 | Cell fault monitoring system and method |
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| WO2023082793A1 (en) | 2023-05-19 |
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