CN113820616A - Battery monitoring method and system, battery management system and vehicle - Google Patents
Battery monitoring method and system, battery management system and vehicle Download PDFInfo
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- CN113820616A CN113820616A CN202010488293.8A CN202010488293A CN113820616A CN 113820616 A CN113820616 A CN 113820616A CN 202010488293 A CN202010488293 A CN 202010488293A CN 113820616 A CN113820616 A CN 113820616A
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 57
- 238000000034 method Methods 0.000 title claims abstract description 42
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 285
- 239000010949 copper Substances 0.000 claims abstract description 285
- 229910052802 copper Inorganic materials 0.000 claims abstract description 285
- 229910000906 Bronze Inorganic materials 0.000 claims description 27
- 239000010974 bronze Substances 0.000 claims description 27
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 claims description 27
- 238000005070 sampling Methods 0.000 claims description 25
- 238000004364 calculation method Methods 0.000 claims description 14
- 239000000126 substance Substances 0.000 claims description 2
- 210000004027 cell Anatomy 0.000 description 88
- 238000007726 management method Methods 0.000 description 53
- 238000009825 accumulation Methods 0.000 description 23
- 230000010485 coping Effects 0.000 description 10
- 230000002159 abnormal effect Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 8
- 238000013024 troubleshooting Methods 0.000 description 7
- 101001057156 Homo sapiens Melanoma-associated antigen C2 Proteins 0.000 description 6
- 102100027252 Melanoma-associated antigen C2 Human genes 0.000 description 6
- 210000004460 N cell Anatomy 0.000 description 6
- 101100100146 Candida albicans NTC1 gene Proteins 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/14—Supports; Fastening devices; Arrangements for mounting thermometers in particular locations
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K3/00—Thermometers giving results other than momentary value of temperature
- G01K3/02—Thermometers giving results other than momentary value of temperature giving means values; giving integrated values
- G01K3/06—Thermometers giving results other than momentary value of temperature giving means values; giving integrated values in respect of space
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K3/00—Thermometers giving results other than momentary value of temperature
- G01K3/08—Thermometers giving results other than momentary value of temperature giving differences of values; giving differentiated values
- G01K3/14—Thermometers giving results other than momentary value of temperature giving differences of values; giving differentiated values in respect of space
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/005—Testing of electric installations on transport means
- G01R31/006—Testing of electric installations on transport means on road vehicles, e.g. automobiles or trucks
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/364—Battery terminal connectors with integrated measuring arrangements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
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- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Secondary Cells (AREA)
Abstract
The invention discloses a battery monitoring method, which comprises the following steps: acquiring the cell voltage and the copper plate temperature of the battery at intervals of a preset time period; the battery comprises a plurality of modules connected by the copper plate, and each module comprises a plurality of battery cells; calculating an average temperature according to the copper plate temperature, and calculating a temperature difference between the current copper plate temperature and the average temperature; calculating average voltage according to the cell voltage, and calculating the voltage difference between the reference voltage of the adjacent cell connected with the current copper plate and the average voltage; the reference voltage is the sum of the voltage of the adjacent battery cell and the voltage drop of the current copper plate; and when the temperature difference and the voltage difference meet the preset copper plate fault condition, judging that the current copper plate has a fault. The invention also discloses a battery management system, a battery monitoring system and a vehicle. By adopting the embodiment of the invention, the fault condition of the copper plate in the battery can be found in time, and the real-time performance of battery monitoring is effectively improved.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a battery monitoring method, a battery monitoring system, a battery management system and a vehicle.
Background
The copper plates, which are commonly referred to as busbar (busbar), may be made of aluminum or aluminum for connecting adjacent modules in the battery. At present, the reliable connection of the copper plates is mainly guaranteed by the operation rules during assembly line installation, a production line is greatly interfered by human factors, the requirement on the automation degree is high, the conditions that the torsion of copper plate bolts is missed or the torsion is insufficient exist, and the copper plates with insufficient torsion can generate heat and gather due to the contact resistance, so that the copper plates are finally burnt. In addition, jolting and vibration in the driving process can also cause the copper plate to loosen, and heat accumulation can be caused. The burning and melting of the copper plate can cause the abnormality of a high-voltage loop of the battery, and finally the high-voltage power failure of the whole vehicle is caused. At present, a mode of effectively monitoring whether the copper plate is burnt or not does not exist, and when the copper plate of the whole vehicle breaks down, the copper plate is difficult to check.
Disclosure of Invention
The embodiment of the invention aims to provide a battery monitoring method, a battery monitoring system, a battery management system and a vehicle, which can find the fault condition of a copper plate in a battery in time and effectively improve the real-time performance of battery monitoring.
In order to achieve the above object, an embodiment of the present invention provides a battery monitoring method, including:
acquiring the cell voltage and the copper plate temperature of the battery at intervals of a preset time period; the battery comprises a plurality of modules connected by the copper plate, and each module comprises a plurality of battery cells;
calculating an average temperature according to the copper plate temperature, and calculating a temperature difference between the current copper plate temperature and the average temperature;
calculating average voltage according to the cell voltage, and calculating the voltage difference between the reference voltage of the adjacent cell connected with the current copper plate and the average voltage; the reference voltage is the sum of the voltage of the adjacent battery cell and the voltage drop of the current copper plate;
and when the temperature difference and the voltage difference meet the preset copper plate fault condition, judging that the current copper plate has a fault.
Compared with the prior art, the battery monitoring method disclosed by the embodiment of the invention comprises the following steps of firstly, periodically obtaining the cell voltage and the copper plate temperature of the battery after a vehicle is powered on, causing heat accumulation when the copper plate is loosened in the driving process, generating voltage drop on the copper plate, and judging whether the copper plate has heat accumulation or not by measuring the voltage and the temperature so as to troubleshoot the copper plate; then, calculating the average temperature according to the temperature of the copper plate, and calculating the temperature difference between the current temperature of the copper plate and the average temperature; meanwhile, calculating average voltage according to the cell voltage, and calculating the voltage difference between the reference voltage and the average voltage of the adjacent cell connected with the current copper plate; and finally, judging whether the temperature difference and the voltage difference meet preset copper plate fault conditions or not, if so, indicating that the current copper plate has heat accumulation, and judging that the current copper plate has a fault. The battery monitoring method disclosed by the embodiment of the invention can find the fault condition of the copper plate in the battery in time, effectively improve the real-time performance and the reliability of battery monitoring and strive for more coping time for the whole vehicle system and passengers.
As an improvement of the above solution, the copper plate fault condition includes:
the temperature difference is greater than a preset temperature threshold and the voltage difference is greater than a preset voltage threshold.
As an improvement of the above scheme, the cell voltage is collected through a voltage sampling pin in a battery management system connected to the battery.
As an improvement of the scheme, the temperature of the copper plate is collected through a temperature sensor arranged on the copper plate.
In order to achieve the above object, an embodiment of the present invention further provides a battery management system, including:
the data acquisition module is used for acquiring the cell voltage and the copper plate temperature of the battery at intervals of a preset time period; the battery comprises a plurality of modules connected by the copper plate, and each module comprises a plurality of battery cells;
the temperature calculation module is used for calculating the average temperature according to the copper plate temperature and calculating the temperature difference between the current copper plate temperature and the average temperature;
the voltage calculation module is used for calculating average voltage according to the cell voltage and calculating the voltage difference between the reference voltage of the adjacent cell connected with the current copper plate and the average voltage; the reference voltage is the sum of the voltage of the adjacent battery cell and the voltage drop of the current copper plate;
and the fault judgment module is used for judging that the current copper plate has a fault when the temperature difference and the voltage difference meet the preset copper plate fault condition.
Compared with the prior art, the battery management system disclosed by the embodiment of the invention has the advantages that firstly, after a vehicle is powered on, the data acquisition module periodically acquires the cell voltage and the copper plate temperature of the battery, heat accumulation can be caused when the copper plate is loosened in the driving process, the copper plate can generate voltage drop at the moment, whether the copper plate is subjected to heat accumulation can be judged by measuring the voltage and the temperature, and therefore the copper plate is subjected to fault troubleshooting; then, the temperature calculation module calculates the average temperature according to the temperature of the copper plate and calculates the temperature difference between the current temperature of the copper plate and the average temperature; meanwhile, the voltage calculation module calculates average voltage according to the cell voltage and calculates the voltage difference between the reference voltage and the average voltage of the adjacent cell connected with the current copper plate; and finally, the fault judgment module judges whether the temperature difference and the voltage difference meet preset copper plate fault conditions or not, if so, the current copper plate is shown to generate heat accumulation, and the current copper plate is judged to have a fault. The battery management system disclosed by the embodiment of the invention can find the fault condition of the copper plate in the battery in time, effectively improve the real-time performance and the reliability of battery monitoring and strive for more coping time for the whole vehicle system and passengers.
As an improvement of the above solution, the copper plate fault condition includes:
the temperature difference is greater than a preset temperature threshold and the voltage difference is greater than a preset voltage threshold.
As an improvement of the above scheme, the data acquisition module comprises a voltage sampling pin and a temperature sampling pin; wherein the content of the first and second substances,
the voltage sampling pin is used for collecting the cell voltage of the battery;
the temperature sampling pin is used for collecting and locating the temperature of the copper plate collected by the temperature sensor on the copper plate.
In order to achieve the above object, an embodiment of the present invention further provides a battery monitoring system, including:
the battery comprises a plurality of modules connected by the copper plates; each module comprises a plurality of battery cells;
a battery management system for:
acquiring the cell voltage and the copper plate temperature of the battery at intervals of a preset time period;
calculating an average temperature according to the copper plate temperature, and calculating a temperature difference between the current copper plate temperature and the average temperature;
calculating average voltage according to the cell voltage, and calculating the voltage difference between the reference voltage of the adjacent cell connected with the current copper plate and the average voltage; the reference voltage is the sum of the voltage of the adjacent battery cell and the voltage drop of the current copper plate;
and when the temperature difference and the voltage difference meet the preset copper plate fault condition, judging that the current copper plate has a fault.
Compared with the prior art, the battery monitoring system disclosed by the embodiment of the invention has the advantages that firstly, after a vehicle is powered on, the battery management system periodically obtains the cell voltage and the copper plate temperature of the battery, heat accumulation can be caused when the copper plate is loosened in the driving process, the copper plate can generate voltage drop at the moment, whether the copper plate is subjected to heat accumulation can be judged by measuring the voltage and the temperature, and therefore the copper plate is subjected to fault troubleshooting; then, the battery management system calculates the average temperature according to the temperature of the copper plate and calculates the temperature difference between the current temperature of the copper plate and the average temperature; meanwhile, the battery management system calculates average voltage according to the cell voltage and calculates the voltage difference between the reference voltage and the average voltage of the adjacent cell connected with the current copper plate; and finally, the battery management system judges whether the temperature difference and the voltage difference meet preset copper plate fault conditions or not, if so, the current copper plate is subjected to heat accumulation, and the current copper plate is judged to have a fault. The battery monitoring system disclosed by the embodiment of the invention can find the fault condition of the copper plate in the battery in time, effectively improve the real-time performance and the reliability of battery monitoring and strive for more coping time for the whole vehicle system and passengers.
As an improvement of the above aspect, the battery monitoring system further includes:
and the temperature sensor is arranged on the copper plate and used for collecting the temperature of the copper plate.
In order to achieve the above object, an embodiment of the present invention further provides a vehicle including the battery monitoring system according to any one of the above embodiments.
Drawings
Fig. 1 is a flowchart of a battery monitoring method according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a connection between a battery management system and a battery according to an embodiment of the present invention;
fig. 3 is a schematic diagram of another battery management system according to an embodiment of the present invention connected to a battery;
FIG. 4 is a flow chart of another battery monitoring method provided by an embodiment of the invention;
fig. 5 is a schematic structural diagram of a battery management system according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a battery monitoring system according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a flowchart of a battery monitoring method according to an embodiment of the present invention; the battery monitoring method comprises the following steps:
s1, acquiring the cell voltage and the copper plate temperature of the battery every other preset time period;
s2, calculating an average temperature according to the copper plate temperature, and calculating the temperature difference between the current copper plate temperature and the average temperature;
s3, calculating average voltage according to the cell voltage, and calculating the voltage difference between the reference voltage of the adjacent cell connected with the current copper plate and the average voltage; the reference voltage is the sum of the voltage of the adjacent battery cell and the voltage drop of the current copper plate;
and S4, when the temperature difference and the voltage difference meet the preset copper plate fault condition, judging that the current copper plate has a fault.
It should be noted that the battery monitoring method according to the embodiment of the present invention may be implemented by a battery monitoring apparatus connected to a battery management system, or implemented by a processor in the battery management system, where the battery management system may be a circuit board with a processor. The battery management system is connected with the battery and used for acquiring data information of the battery and managing the battery.
The battery includes that a plurality of is used the module that the copper tablet is connected will through the screw the copper tablet with module fastening connection, each contain a plurality of electricity core in the module. When the copper tablet produces not hard up because of torsion is not enough or receive jolting, vibrations in the driving process, the screw can become flexible, the copper tablet with the junction of module is not hard up, and contact impedance grow has the electric current to flow through the time the copper tablet can produce the pressure drop, causes the rising of voltage simultaneously, causes the heat gathering and leads to the copper tablet burns and melts, and the copper tablet burns and melt can lead to the high-voltage circuit of battery unusual, finally leads to whole car high-voltage power down. Whether the copper plate generates heat accumulation and causes faults can be reflected through monitoring the cell voltage and the temperature of the battery, so that the problem that in the prior art, when the copper plate faults occur in the whole vehicle, the faults are difficult to be checked is solved. The method can find the fault condition of the copper plate in the battery in time, effectively improve the real-time performance and the reliability of battery monitoring, and strive for more coping time for the whole vehicle system and passengers.
Specifically, in step S1, after the vehicle is powered on, the cell voltage and the bronze medal temperature of the battery are acquired every preset time period. For example, the preset time period may be set by a user or may be set when the vehicle leaves a factory, and the present invention is not particularly limited thereto. Through periodical collection electric core voltage and copper tablet temperature, can in time monitor the battery state to whether the heat gathering takes place for the judgement copper tablet, in order to carry out troubleshooting to the copper tablet.
Preferably, the cell voltage is acquired through a voltage sampling pin in a battery management system connected with the battery, and a voltage sensor is not required to be used in cooperation; the temperature of the copper plate is acquired by a temperature sensor arranged on the copper plate through a temperature sampling pin in the battery management system, an insulating skin is sleeved on the surface of the copper plate, and the temperature sensor is implanted into the insulating skin or tightly attached to the surface of the copper plate.
Referring to fig. 2, fig. 2 is a schematic diagram of a connection between a battery management system and a battery according to an embodiment of the present invention. The battery comprises a module A and a module B, wherein the module A and the module B are connected through a copper plate (shown by a busbar in the figure), the module A comprises battery cells 1-4, and the module B comprises battery cells 5-8. The BMS is the battery management system, and the battery management system is connected with the battery through a pin of the BMS; the CT pin is the voltage sampling pin, and the NTC pin is the temperature sampling pin. Illustratively, CT9 and CT10 are used to measure the voltage of cell5, CT8 and CT9 are used to measure the voltage of cell4 and the bronze brand, and CT7 and CT8 are used to measure the voltage of cell 3. The voltage of the battery core is measured through the CT pin of the battery management system, and whether the copper plate generates voltage drop or not can be indirectly reflected.
The copper plate is fixedly connected with the module A and the module B through screws, in the running process of a vehicle, the screws can be loosened, so that the contact impedance of the copper plate is increased, when current flows, a large voltage drop Vbus bar can be generated, as shown in the figure, only one power-saving core cell4 is arranged between the CT9 and the CT8, under the ideal state that the copper plate is well connected, the voltage between the CT9 and the CT8 is the voltage of the battery cell4, but under the condition that the copper plate is loosened, the voltage between the CT9 and the CT8 is the voltage of the battery cell4 and is superposed with the voltage drop Vbus bar of the copper plate, and the voltage measured by the CT9 and the CT8 is higher.
Specifically, in step S3, an average temperature is calculated based on the bronze medal temperature. As shown in fig. 2, the NTC1 pin of the battery management system is used to obtain the temperature of the temperature sensor mounted on the copper plate. For example, assuming that there are M copper plates (M is an integer) in the battery, that is, there are M copper plate temperatures at this time, which are denoted as t1, t 2.. tm, then the average temperature Taverg is sum (t1, t 2.. tm)/M. And calculating the temperature difference between the current temperature of any one of the copper plates and the average temperature, and obtaining M temperature differences at the moment.
Specifically, in step S4, an average voltage is calculated according to the cell voltage. For example, assuming that there are N cells (N is an integer) of the battery, and there are N cell voltages, denoted as v1, v2... vn, then the average voltage Vaverg ═ sum (v1, v2... vn)/N.
Calculating the voltage difference between the reference voltage of the adjacent electric core connected with the current copper plate and the average voltage, and obtaining M voltage differences at the moment; and the reference voltage is the sum of the voltage of the adjacent battery cell and the voltage drop of the current copper plate. Taking the copper plate in fig. 2 as an example, two adjacent battery cells are provided, namely cell4 and cell5, at this time, and the adjacent battery cells usable in the embodiment of the present invention are determined according to the connection relationship between the CT pin of the battery management system and the battery cells. Referring to fig. 2, CT9 is connected to the negative electrode of cell5, and CT10 is connected to the positive electrode of cell5, at this time, CT9 and CT10 can only detect the voltage of cell 5; the CT8 is connected with the negative electrode of the cell4, the positive electrode of the cell4 is connected with one end of the copper plate, and the other end of the copper plate is connected with the CT9, so that the CT8 and the CT9 can detect the voltage of the copper plate besides the voltage of the cell4, and therefore the cell4 is selected as an adjacent cell available in the embodiment of the invention.
Further, when the connection relationship between the CT pin of the battery management system and the battery is changed, the selected adjacent battery cell is also changed. As shown in fig. 3, the CT9 is connected to the positive electrode of the cell5, the negative electrode of the cell5 is connected to one end of the copper plate, and the other end of the copper plate is connected to the CT8, so that the CT8 and the CT9 can detect the voltage of the copper plate in addition to the voltage of the cell5, and therefore the cell5 is selected as the neighboring cell usable in the embodiment of the present invention.
Specifically, in step S4, M temperature differences and M voltage differences corresponding to all the bronze medals are respectively determined, and it is determined whether a preset bronze medal fault condition is satisfied. For example, the bronze medal fault condition is that the temperature difference is greater than a preset temperature threshold Δ T and the voltage difference is greater than a preset voltage threshold Δ U. For example, when the temperature of the current bronze medal is T1, the corresponding adjacent battery cell is cell4, and the voltage corresponding to cell4 is Ucell4, it is determined that the current bronze medal has a fault when T1-Taverg > Δ T and Ucell4-Vaverg > Δ U.
Further, the process of steps S1-S4 may refer to fig. 4, and fig. 4 is a flowchart of another battery monitoring method according to an embodiment of the present invention.
Compared with the prior art, the battery monitoring method disclosed by the embodiment of the invention comprises the following steps of firstly, periodically obtaining the cell voltage and the copper plate temperature of the battery after a vehicle is powered on, causing heat accumulation when the copper plate is loosened in the driving process, generating voltage drop on the copper plate, and judging whether the copper plate has heat accumulation or not by measuring the voltage and the temperature so as to troubleshoot the copper plate; then, calculating the average temperature according to the temperature of the copper plate, and calculating the temperature difference between the current temperature of the copper plate and the average temperature; meanwhile, calculating average voltage according to the cell voltage, and calculating the voltage difference between the reference voltage and the average voltage of the adjacent cell connected with the current copper plate; and finally, judging whether the temperature difference and the voltage difference meet preset copper plate fault conditions or not, if so, indicating that the current copper plate has heat accumulation, and judging that the current copper plate has a fault.
According to the battery monitoring method disclosed by the embodiment of the invention, data are continuously acquired, all voltage abnormity and temperature abnormity are monitored, the mutual verification of the temperature of the abnormal electric core adjacent to the copper plate and the temperature of the copper plate is emphasized by combining the position of the copper plate, and when the temperature abnormity and the voltage abnormity of the adjacent electric core occur simultaneously, the probability of the abnormal connection of the copper plate can be determined. The method can find the fault condition of the copper plate in the battery in time, effectively improve the real-time performance and the reliability of battery monitoring, and strive for more coping time for the whole vehicle system and passengers.
Referring to fig. 5, fig. 5 is a schematic structural diagram of a battery management system 10 according to an embodiment of the present invention; the battery management system 10 includes:
the data acquisition module 11 is used for acquiring the cell voltage and the copper plate temperature of the battery at intervals of a preset time period; the battery comprises a plurality of modules connected by the copper plate, and each module comprises a plurality of battery cells;
the temperature calculation module 12 is configured to calculate an average temperature according to the temperature of the copper plate, and calculate a temperature difference between the current temperature of the copper plate and the average temperature;
the voltage calculation module 13 is configured to calculate an average voltage according to the cell voltage, and calculate a voltage difference between a reference voltage of an adjacent cell connected to the current bronze medal and the average voltage; the reference voltage is the sum of the voltage of the adjacent battery cell and the voltage drop of the current copper plate;
and the fault judgment module 14 is configured to judge that the current bronze medal has a fault when the temperature difference and the voltage difference meet a preset bronze medal fault condition.
It should be noted that the battery management system may be a circuit board with a processor, and the battery management system is connected to the battery and is configured to obtain data information of the battery and manage the battery.
The battery includes that a plurality of is used the module that the copper tablet is connected will through the screw the copper tablet with module fastening connection, each contain a plurality of electricity core in the module. When the copper tablet produces not hard up because of torsion is not enough or receive jolting, vibrations in the driving process, the screw can become flexible, the copper tablet with the junction of module is not hard up, and contact impedance grow has the electric current to flow through the time the copper tablet can produce the pressure drop, causes the rising of voltage simultaneously, causes the heat gathering and leads to the copper tablet burns and melts, and the copper tablet burns and melt can lead to the high-voltage circuit of battery unusual, finally leads to whole car high-voltage power down. Whether the copper plate generates heat accumulation and causes faults can be reflected through monitoring the cell voltage and the temperature of the battery, so that the problem that in the prior art, when the copper plate faults occur in the whole vehicle, the faults are difficult to be checked is solved. The method can find the fault condition of the copper plate in the battery in time, effectively improve the real-time performance and the reliability of battery monitoring, and strive for more coping time for the whole vehicle system and passengers.
Specifically, after the vehicle is powered on, the data acquisition module 11 acquires the cell voltage and the copper plate temperature of the battery every preset time period. For example, the preset time period may be set by a user or may be set when the vehicle leaves a factory, and the present invention is not particularly limited thereto. Through periodical collection electric core voltage and copper tablet temperature, can in time monitor the battery state to whether the heat gathering takes place for the judgement copper tablet, in order to carry out troubleshooting to the copper tablet.
Preferably, the data acquisition module 11 includes a voltage sampling pin and a temperature sampling pin; the voltage sampling pin is used for collecting the cell voltage of the battery, and a voltage sensor is not needed to be matched for use; the temperature sampling pin is used for collecting and locating the copper plate temperature collected by the temperature sensor on the copper plate. The surface of the copper plate is sleeved with an insulating skin, and the insulating skin is implanted inside the insulating skin or the surface of the copper plate is tightly attached to the temperature sensor.
Referring to fig. 2, fig. 2 is a schematic diagram of a connection between a battery management system and a battery according to an embodiment of the present invention. The battery comprises a module A and a module B, wherein the module A and the module B are connected through a copper plate (shown by a busbar in the figure), the module A comprises battery cells 1-4, and the module B comprises battery cells 5-8. The BMS is the battery management system, and the battery management system is connected with the battery through a pin of the BMS; the CT pin is the voltage sampling pin, and the NTC pin is the temperature sampling pin. Illustratively, CT9 and CT10 are used to measure the voltage of cell5, CT8 and CT9 are used to measure the voltage of cell4 and the bronze brand, and CT7 and CT8 are used to measure the voltage of cell 3. The voltage of the battery core is measured through the CT pin of the battery management system, and whether the copper plate generates voltage drop or not can be indirectly reflected.
The copper plate is fixedly connected with the module A and the module B through screws, in the running process of a vehicle, the screws can be loosened, so that the contact impedance of the copper plate is increased, when current flows, a large voltage drop Vbus bar can be generated, as shown in the figure, only one power-saving core cell4 is arranged between the CT9 and the CT8, under the ideal state that the copper plate is well connected, the voltage between the CT9 and the CT8 is the voltage of the battery cell4, but under the condition that the copper plate is loosened, the voltage between the CT9 and the CT8 is the voltage of the battery cell4 and is superposed with the voltage drop Vbus bar of the copper plate, and the voltage measured by the CT9 and the CT8 is higher.
Specifically, the temperature calculation module 12 calculates an average temperature according to the temperature of the bronze medal. As shown in fig. 2, the NTC1 pin of the battery management system is used to obtain the temperature of the temperature sensor mounted on the copper plate. For example, assuming that there are M copper plates (M is an integer) in the battery, that is, there are M copper plate temperatures at this time, which are denoted as t1, t 2.. tm, then the average temperature Taverg is sum (t1, t 2.. tm)/M. The temperature calculation module 12 calculates a temperature difference between the current temperature of any one of the copper tiles and the average temperature, and at this time, M temperature differences can be obtained.
Specifically, the voltage calculation module 13 calculates an average voltage according to the cell voltage. For example, assuming that there are N cells (N is an integer) of the battery, and there are N cell voltages, denoted as v1, v2... vn, then the average voltage Vaverg ═ sum (v1, v2... vn)/N.
The voltage calculation module 13 calculates a voltage difference between the reference voltage of the adjacent electric core connected with the current bronze medal and the average voltage, and at this time, M voltage differences can be obtained; and the reference voltage is the sum of the voltage of the adjacent battery cell and the voltage drop of the current copper plate. Taking the copper plate in fig. 2 as an example, two adjacent battery cells are provided, namely cell4 and cell5, at this time, and the adjacent battery cells usable in the embodiment of the present invention are determined according to the connection relationship between the CT pin of the battery management system and the battery cells. Referring to fig. 2, CT9 is connected to the negative electrode of cell5, and CT10 is connected to the positive electrode of cell5, at this time, CT9 and CT10 can only detect the voltage of cell 5; the CT8 is connected with the negative electrode of the cell4, the positive electrode of the cell4 is connected with one end of the copper plate, and the other end of the copper plate is connected with the CT9, so that the CT8 and the CT9 can detect the voltage of the copper plate besides the voltage of the cell4, and therefore the cell4 is selected as an adjacent cell available in the embodiment of the invention.
Specifically, the fault determining module 14 determines M temperature differences and M voltage differences corresponding to all the bronze medals, respectively, to determine whether a preset bronze medal fault condition is satisfied. For example, the bronze medal fault condition is that the temperature difference is greater than a preset temperature threshold Δ T and the voltage difference is greater than a preset voltage threshold Δ U. For example, when the temperature of the current bronze medal is T1, the corresponding adjacent battery cell is cell4, and the voltage corresponding to cell4 is Ucell4, it is determined that the current bronze medal has a fault when T1-Taverg > Δ T and Ucell4-Vaverg > Δ U.
Compared with the prior art, the battery management system disclosed by the embodiment of the invention comprises the following steps that firstly, after a vehicle is powered on, the data acquisition module 11 periodically acquires the cell voltage and the copper plate temperature of the battery, heat accumulation can be caused when the copper plate is loosened in the driving process, the copper plate can generate voltage drop at the moment, whether the copper plate is subjected to heat accumulation can be judged by measuring the voltage and the temperature, and therefore the copper plate is subjected to fault troubleshooting; then, the temperature calculation module 12 calculates an average temperature according to the temperature of the copper plate, and calculates a temperature difference between the current temperature of the copper plate and the average temperature; meanwhile, the voltage calculation module 13 calculates an average voltage according to the cell voltage, and calculates a voltage difference between a reference voltage of an adjacent cell connected to the current copper plate and the average voltage; finally, the fault determining module 14 determines whether the temperature difference and the voltage difference meet a preset copper plate fault condition, and if so, indicates that the current copper plate has heat accumulation, and determines that the current copper plate has a fault.
The battery management system 10 disclosed in the embodiment of the invention collects data continuously, monitors all voltage anomalies and temperature anomalies, and verifies the temperatures of the abnormal cells adjacent to the copper plate and the copper plate in combination with the position of the copper plate, so that when the temperature anomalies and the voltages of the adjacent cells are abnormal at the same time, the probability of the abnormal connection of the copper plate can be determined. The method can find the fault condition of the copper plate in the battery in time, effectively improve the real-time performance and the reliability of battery monitoring, and strive for more coping time for the whole vehicle system and passengers.
Referring to fig. 6, fig. 6 is a schematic structural diagram of a battery monitoring system according to an embodiment of the present invention. The battery monitoring system includes:
a battery 20 comprising a plurality of modules 21 connected by the copper plate 22; each module 21 includes a plurality of battery cells 211;
a battery management system 10 for:
acquiring the cell voltage and the copper plate temperature of the battery 20 every other preset time period;
calculating an average temperature according to the copper plate temperature, and calculating a temperature difference between the current copper plate temperature and the average temperature;
calculating average voltage according to the cell voltage, and calculating the voltage difference between the reference voltage of the adjacent cell connected with the current copper plate and the average voltage; the reference voltage is the sum of the voltage of the adjacent battery cell and the voltage drop of the current copper plate;
and when the temperature difference and the voltage difference meet the preset copper plate fault condition, judging that the current copper plate has a fault.
When the copper plate 22 is loosened due to insufficient torque or jolt and vibration in the driving process, the copper plate 22 generates a voltage drop, and the voltage is increased, so that heat accumulation is caused to cause the burning of the copper plate 22, the burning of the copper plate can cause the abnormality of a high-voltage loop of the battery 20, and finally the high-voltage power failure of the whole vehicle is caused. Whether the copper plate generates heat accumulation and causes faults can be reflected through monitoring the cell voltage and the temperature of the battery, so that the problem that in the prior art, when the copper plate faults occur in the whole vehicle, the faults are difficult to be checked is solved. The method can find the fault condition of the copper plate in the battery in time, effectively improve the real-time performance and the reliability of battery monitoring, and strive for more coping time for the whole vehicle system and passengers.
Preferably, the battery monitoring system further comprises a temperature sensor 30, wherein the temperature sensor 30 is arranged on the copper plate 22 and is used for collecting the temperature of the copper plate 22.
The battery management system 10 includes a voltage sampling pin and a temperature sampling pin; the voltage sampling pin is used for collecting the cell voltage of the battery 20, and a voltage sensor is not required to be used in cooperation; the temperature sampling pin is used for collecting the temperature of the copper plate collected by the temperature sensor 30 arranged on the copper plate 22. An insulating sheath is sleeved on the surface of the copper plate 22, and the temperature sensor 30 is implanted in the insulating sheath or is tightly attached to the surface of the copper plate 22.
Specifically, after the vehicle is powered on, the battery management system 10 obtains the cell voltage and the copper plate temperature of the battery 20 every preset time period. For example, the preset time period may be set by a user or may be set when the vehicle leaves a factory, and the present invention is not particularly limited thereto. Through periodical collection electric core voltage and copper tablet temperature, can in time monitor the battery state to whether the heat gathering takes place for the judgement copper tablet, in order to carry out troubleshooting to the copper tablet.
Specifically, the battery management system 10 calculates an average temperature according to the temperature of the copper plate, and a temperature sampling pin of the battery management system 10 is used for acquiring the temperature of the temperature sensor 30 arranged on the copper plate 22. For example, assuming that there are M copper plates (M is an integer) in the battery, that is, there are M copper plate temperatures at this time, which are denoted as t1, t 2.. tm, then the average temperature Taverg is sum (t1, t 2.. tm)/M. The battery management system 10 calculates a temperature difference between the current temperature of any one of the copper plates and the average temperature, and then M temperature differences can be obtained.
Specifically, the battery management system 10 calculates an average voltage according to the cell voltage. For example, assuming that there are N cells 211 (N is an integer) of the battery 20, and there are N cell voltages, denoted as v1, v2... vn, then the average voltage Vaverg ═ sum (v1, v2... vn)/N.
The battery management system 10 calculates a voltage difference between the reference voltage of the adjacent battery cell 211 connected to the current bronze medal 22 and the average voltage, and at this time, M voltage differences can be obtained; the reference voltage is the sum of the voltage of the adjacent battery cell 211 and the voltage drop of the current copper plate 22.
Specifically, the battery management system 10 determines M temperature differences and M voltage differences corresponding to all the bronze medals 22, respectively, to determine whether a preset bronze medal fault condition is satisfied. For example, the bronze medal fault condition is that the temperature difference is greater than a preset temperature threshold Δ T and the voltage difference is greater than a preset voltage threshold Δ U. For example, when the temperature of the current bronze medal is T1, the corresponding adjacent battery cell is cell4, and the voltage corresponding to cell4 is Ucell4, it is determined that the current bronze medal has a fault when T1-Taverg > Δ T and Ucell4-Vaverg > Δ U.
Compared with the prior art, the battery monitoring system disclosed by the embodiment of the invention has the advantages that firstly, after a vehicle is powered on, the battery management system 10 periodically obtains the cell voltage and the copper plate temperature of the battery 20, heat accumulation can be caused when the copper plate 22 is loosened in the driving process, the copper plate 22 can generate voltage drop, whether the copper plate 22 generates heat accumulation can be judged by measuring the voltage and the temperature, and therefore the copper plate 22 is subjected to fault troubleshooting; then, the battery management system 10 calculates an average temperature according to the temperature of the copper plate, and calculates a temperature difference between the current temperature of the copper plate and the average temperature; meanwhile, the battery management system 10 calculates an average voltage according to the cell voltage, and calculates a voltage difference between a reference voltage of an adjacent cell connected to the current copper plate and the average voltage; and finally, the battery management system judges whether the temperature difference and the voltage difference meet preset copper plate fault conditions or not, if so, the current copper plate 22 is subjected to heat accumulation, and the current copper plate 22 is judged to have a fault.
According to the battery monitoring system disclosed by the embodiment of the invention, data are continuously acquired, all voltage abnormity and temperature abnormity are monitored, the mutual verification of the temperature of the abnormal electric core adjacent to the copper plate and the temperature of the copper plate is emphasized by combining the position of the copper plate, and when the temperature abnormity and the voltage abnormity of the adjacent electric core occur simultaneously, the probability of the abnormal connection of the copper plate can be determined. The method can find the fault condition of the copper plate in the battery in time, effectively improve the real-time performance and the reliability of battery monitoring, and strive for more coping time for the whole vehicle system and passengers.
The embodiment of the invention also provides a vehicle which comprises the battery monitoring system in the embodiment.
For a specific working process of the battery monitoring system, please refer to the working process of the battery monitoring system described in the above embodiment, which is not described herein again.
Compared with the prior art, the embodiment of the invention continuously collects data, monitors all voltage abnormity and temperature abnormity, and combines the position of the copper plate to mainly verify the temperature of the abnormal electric core adjacent to the copper plate and the temperature of the copper plate, so that when the temperature abnormity and the voltage abnormity of the adjacent electric core occur simultaneously, the probability of the abnormal connection of the copper plate can be determined. The method can find the fault condition of the copper plate in the battery in time, effectively improve the real-time performance and the reliability of battery monitoring, and strive for more coping time for the whole vehicle system and passengers.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (10)
1. A battery monitoring method, comprising:
acquiring the cell voltage and the copper plate temperature of the battery at intervals of a preset time period; the battery comprises a plurality of modules connected by the copper plate, and each module comprises a plurality of battery cells;
calculating an average temperature according to the copper plate temperature, and calculating a temperature difference between the current copper plate temperature and the average temperature;
calculating average voltage according to the cell voltage, and calculating the voltage difference between the reference voltage of the adjacent cell connected with the current copper plate and the average voltage; the reference voltage is the sum of the voltage of the adjacent battery cell and the voltage drop of the current copper plate;
and when the temperature difference and the voltage difference meet the preset copper plate fault condition, judging that the current copper plate has a fault.
2. The battery monitoring method of claim 1, wherein the bronze brand fault condition comprises:
the temperature difference is greater than a preset temperature threshold and the voltage difference is greater than a preset voltage threshold.
3. The battery monitoring method of claim 1, wherein the cell voltage is collected via a voltage sampling pin in a battery management system connected to the battery.
4. The battery monitoring method of claim 1, wherein the copper plate temperature is collected by a temperature sensor disposed on the copper plate.
5. A battery management system, comprising:
the data acquisition module is used for acquiring the cell voltage and the copper plate temperature of the battery at intervals of a preset time period; the battery comprises a plurality of modules connected by the copper plate, and each module comprises a plurality of battery cells;
the temperature calculation module is used for calculating the average temperature according to the copper plate temperature and calculating the temperature difference between the current copper plate temperature and the average temperature;
the voltage calculation module is used for calculating average voltage according to the cell voltage and calculating the voltage difference between the reference voltage of the adjacent cell connected with the current copper plate and the average voltage; the reference voltage is the sum of the voltage of the adjacent battery cell and the voltage drop of the current copper plate;
and the fault judgment module is used for judging that the current copper plate has a fault when the temperature difference and the voltage difference meet the preset copper plate fault condition.
6. The battery management system of claim 5, wherein the bronze brand fault condition comprises:
the temperature difference is greater than a preset temperature threshold and the voltage difference is greater than a preset voltage threshold.
7. The battery management system of claim 5, wherein the data acquisition module comprises a voltage sampling pin and a temperature sampling pin; wherein the content of the first and second substances,
the voltage sampling pin is used for collecting the cell voltage of the battery;
the temperature sampling pin is used for collecting and locating the temperature of the copper plate collected by the temperature sensor on the copper plate.
8. A battery monitoring system, comprising:
the battery comprises a plurality of modules connected by the copper plates; each module comprises a plurality of battery cells;
a battery management system for:
acquiring the cell voltage and the copper plate temperature of the battery at intervals of a preset time period;
calculating an average temperature according to the copper plate temperature, and calculating a temperature difference between the current copper plate temperature and the average temperature;
calculating average voltage according to the cell voltage, and calculating the voltage difference between the reference voltage of the adjacent cell connected with the current copper plate and the average voltage; the reference voltage is the sum of the voltage of the adjacent battery cell and the voltage drop of the current copper plate;
and when the temperature difference and the voltage difference meet the preset copper plate fault condition, judging that the current copper plate has a fault.
9. The battery monitoring system of claim 8, further comprising:
and the temperature sensor is arranged on the copper plate and used for collecting the temperature of the copper plate.
10. A vehicle comprising the battery monitoring system according to any one of claims 8 to 9.
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