CN113829950A - High-voltage battery insulation monitoring system of electric automobile - Google Patents
High-voltage battery insulation monitoring system of electric automobile Download PDFInfo
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- CN113829950A CN113829950A CN202111110853.7A CN202111110853A CN113829950A CN 113829950 A CN113829950 A CN 113829950A CN 202111110853 A CN202111110853 A CN 202111110853A CN 113829950 A CN113829950 A CN 113829950A
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- Prior art keywords
- circuit
- voltage acquisition
- voltage
- battery
- single chip
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Classifications
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
- G01R19/2503—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques for measuring voltage only, e.g. digital volt meters (DVM's)
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/025—Measuring very high resistances, e.g. isolation resistances, i.e. megohm-meters
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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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/16—Information or communication technologies improving the operation of electric vehicles
Abstract
The invention relates to a high-voltage battery insulation monitoring system of an electric automobile. In the system, a power supply circuit is connected with a singlechip circuit, a communication circuit and a voltage acquisition circuit; the single chip circuit is connected with the communication circuit and the voltage acquisition circuit; the voltage acquisition circuit is connected with the insulation resistor and the contactor which are connected in parallel with the power battery pack; the communication circuit is connected with a main module of the battery management system; the single chip microcomputer circuit determines the resistance value of the insulation resistor of the power battery according to the voltage data of the insulation resistor acquired by the voltage acquisition circuit and transmits the determined resistance value to the main module through the communication circuit; the main module monitors according to the resistance value of the insulation resistor of the power battery, and gives an alarm when the resistance value of the insulation resistor of the power battery is smaller than a set threshold value. The invention can realize the monitoring of the insulation resistance and the voltage of the battery and improve the working efficiency.
Description
Technical Field
The invention relates to the field of battery monitoring of electric automobiles, in particular to a high-voltage battery insulation monitoring system of an electric automobile.
Background
Medium and high voltage battery systems in on-board energy storage devices are defined to be class B voltage with maximum operating voltages >30vac (rms), ≦ 1000vac (rms), or >60VDC, ≦ 1500 VDC. The electrical safety of a high-voltage battery system is directly related to the life safety of system application personnel, and the insulation failure can cause direct damage of high voltage to human bodies, so that the detection and test of the insulation resistance are important links.
The conventional detection circuit involves many elements including a relay, and if the detection circuit fails, the elements including the relay need to be checked for problems; elements such as a relay are fixedly arranged in the box body, and when the elements such as the relay have faults, the box body needs to be dismantled; and demolish the work load and the degree of difficulty that the box had increased the detection undoubtedly, greatly reduced work efficiency.
Therefore, a monitoring module is needed to improve the working efficiency.
Disclosure of Invention
The invention aims to provide a high-voltage battery insulation monitoring system of an electric automobile, which can realize the monitoring of battery insulation resistance and voltage and improve the working efficiency.
In order to achieve the purpose, the invention provides the following scheme:
a high-voltage battery insulation monitoring system of an electric automobile is arranged in a battery management system of the electric automobile; the method comprises the following steps: the device comprises a power supply circuit, a singlechip circuit, a communication circuit and a voltage acquisition circuit;
the power supply circuit is respectively connected with the single chip circuit, the communication circuit and the voltage acquisition circuit;
the single chip microcomputer circuit is respectively connected with the communication circuit and the voltage acquisition circuit;
the voltage acquisition circuit is connected with an insulation resistor and a contactor which are connected in parallel with the power battery pack;
the communication circuit is connected with a main module of the battery management system;
the single chip microcomputer circuit is used for determining the resistance value of the insulation resistor of the power battery according to the voltage data of the insulation resistor acquired by the voltage acquisition circuit and transmitting the determined resistance value of the insulation resistor of the power battery to the main module through the communication circuit; the main module monitors the resistance value of the insulation resistor of the power battery and gives an alarm when the resistance value of the insulation resistor of the power battery is smaller than a set threshold value.
Optionally, the voltage acquisition circuit comprises: the voltage acquisition unit and the voltage acquisition switch;
the voltage acquisition units are connected with the voltage acquisition switches in a one-to-one corresponding manner; the single chip microcomputer circuit is also used for controlling the working state of the corresponding voltage acquisition unit through the voltage acquisition switch.
Optionally, the method further comprises: a plug-in circuit;
the power supply circuit is respectively connected with the single chip circuit, the communication circuit and the voltage acquisition circuit through a plug connector circuit;
the plug connector circuit is used for performing voltage and current conversion and controlling the on-off of the circuit.
Optionally, the single chip microcomputer circuit includes: the program debugging unit and the singlechip control unit;
the program debugging unit is used for receiving a control instruction of the upper computer so as to edit the program of the single chip microcomputer control unit.
Optionally, the single chip microcomputer circuit further includes: an AD converter;
the AD converter is connected with the voltage acquisition circuit;
the AD converter is used for converting the analog signal output by the voltage acquisition circuit into a digital signal.
Optionally, the communication circuit is connected to the main module of the battery management system via a CAN bus.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
according to the high-voltage battery insulation monitoring system of the electric automobile, the resistance value of the insulation resistor of the power battery is determined according to the voltage data of the insulation resistor collected by the voltage acquisition circuit, the insulation performance is judged according to the determined resistance value of the insulation resistor of the power battery, the working state of a contactor in the battery pack is monitored, and the working stability of the battery pack is improved. The invention replaces physical detection, has intuitive fault state and is clear at a glance, reduces the manual detection steps, avoids unpacking detection and greatly increases the working efficiency.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a high-voltage battery insulation monitoring system of an electric vehicle according to 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.
The invention aims to provide a high-voltage battery insulation monitoring system of an electric automobile, which can realize the monitoring of battery insulation resistance and voltage and improve the working efficiency.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
The high-voltage battery insulation monitoring system of the electric automobile is arranged in a battery management system of the electric automobile; fig. 1 is a schematic structural diagram of a high-voltage battery insulation monitoring system of an electric vehicle according to the present invention, where the high-voltage battery insulation monitoring system of the electric vehicle shown in fig. 1 includes: the power supply circuit 101, the singlechip circuit 102, the communication circuit 103 and the voltage acquisition circuit 104;
the power circuit 101 is respectively connected with the singlechip circuit 102, the communication circuit 103 and the voltage acquisition circuit 104;
the single chip circuit 102 is respectively connected with the communication circuit 103 and the voltage acquisition circuit 104;
the voltage acquisition circuit 104 is connected with an insulation resistor and a contactor which are connected in parallel with the power battery pack;
the communication circuit 103 is connected with a main module of the battery management system;
the single chip microcomputer circuit 102 is configured to determine a resistance value of the insulation resistor of the power battery according to the voltage data of the insulation resistor acquired by the voltage acquisition circuit 104, and transmit the determined resistance value of the insulation resistor of the power battery to the main module through the communication circuit 103; the main module monitors the resistance value of the insulation resistor of the power battery and gives an alarm when the resistance value of the insulation resistor of the power battery is smaller than a set threshold value.
Setting the minimum requirement of the insulation resistance of the electric automobile specified by a threshold GB-T18384-2015: DC 100 omega/V and AC 500 omega/V.
When the resistance value of the insulation resistor of the power battery is smaller than a set threshold value, the generated alarm information comprises the identifier of the battery pack; and further reminding maintenance personnel to check and maintain in time according to the alarm information.
The voltage acquisition circuit 104 includes: the voltage acquisition unit and the voltage acquisition switch;
the voltage acquisition units are connected with the voltage acquisition switches in a one-to-one corresponding manner; the single chip circuit 102 is further configured to control the operating state of the corresponding voltage collecting unit through the voltage collecting switch.
The communication circuit 103 is connected to the main module of the battery management system via a CAN bus as a specific example.
As a specific embodiment, the number of the voltage acquisition units is 4, and the number of the corresponding voltage acquisition switches is 4; 1 voltage acquisition unit is used for calculating insulation resistance, and 3 voltage acquisition units are used for judging the contactor state in addition. The state of the contactor is judged to be on-off of the contactor, and the 3 voltage acquisition units are respectively positioned on the positive contactor and the negative contactor and used for short-circuiting the contactor of a certain resistor.
The voltage acquisition unit is arranged to detect and calculate the insulation resistance of the battery to the ground and the insulation resistance of the battery to the ground, so that the insulation performance is judged, the working state of the contactor in the battery pack is monitored, and the working stability of the battery pack is improved.
The voltage acquisition unit is a voltage sensor.
The invention provides a high-voltage battery insulation monitoring system of an electric automobile, which ensures the safety of a circuit and also comprises: a plug-in circuit;
the power circuit 101 is respectively connected with the singlechip circuit 102, the communication circuit 103 and the voltage acquisition circuit 104 through plug connector circuits;
the plug connector circuit is used for performing voltage and current conversion and controlling the on-off of the circuit.
The one-chip microcomputer circuit 102 includes: the program debugging unit and the singlechip control unit;
the program debugging unit is used for receiving a control instruction of the upper computer so as to edit the program of the single chip microcomputer control unit.
The single chip circuit 102 further includes: an AD converter;
the AD converter is connected to the voltage acquisition circuit 104;
the AD converter is configured to convert an analog signal output by the voltage acquisition circuit 104 into a digital signal.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (6)
1. A high-voltage battery insulation monitoring system of an electric automobile is arranged in a battery management system of the electric automobile; it is characterized by comprising: the device comprises a power supply circuit, a singlechip circuit, a communication circuit and a voltage acquisition circuit;
the power supply circuit is respectively connected with the single chip circuit, the communication circuit and the voltage acquisition circuit;
the single chip microcomputer circuit is respectively connected with the communication circuit and the voltage acquisition circuit;
the voltage acquisition circuit is connected with an insulation resistor and a contactor which are connected in parallel with the power battery pack;
the communication circuit is connected with a main module of the battery management system;
the single chip microcomputer circuit is used for determining the resistance value of the insulation resistor of the power battery according to the voltage data of the insulation resistor acquired by the voltage acquisition circuit and transmitting the determined resistance value of the insulation resistor of the power battery to the main module through the communication circuit; the main module monitors the resistance value of the insulation resistor of the power battery and gives an alarm when the resistance value of the insulation resistor of the power battery is smaller than a set threshold value.
2. The system according to claim 1, wherein the voltage acquisition circuit comprises: the voltage acquisition unit and the voltage acquisition switch;
the voltage acquisition units are connected with the voltage acquisition switches in a one-to-one corresponding manner; the single chip microcomputer circuit is also used for controlling the working state of the corresponding voltage acquisition unit through the voltage acquisition switch.
3. The system for monitoring insulation of the high-voltage battery of the electric vehicle as claimed in claim 1, further comprising: a plug-in circuit;
the power supply circuit is respectively connected with the single chip circuit, the communication circuit and the voltage acquisition circuit through a plug connector circuit;
the plug connector circuit is used for performing voltage and current conversion and controlling the on-off of the circuit.
4. The system according to claim 1, wherein the single chip circuit comprises: the program debugging unit and the singlechip control unit;
the program debugging unit is used for receiving a control instruction of the upper computer so as to edit the program of the single chip microcomputer control unit.
5. The system according to claim 4, wherein the single chip circuit further comprises: an AD converter;
the AD converter is connected with the voltage acquisition circuit;
the AD converter is used for converting the analog signal output by the voltage acquisition circuit into a digital signal.
6. The system according to claim 1, wherein the communication circuit is connected to a main module of the battery management system via a CAN bus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111110853.7A CN113829950A (en) | 2021-09-23 | 2021-09-23 | High-voltage battery insulation monitoring system of electric automobile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111110853.7A CN113829950A (en) | 2021-09-23 | 2021-09-23 | High-voltage battery insulation monitoring system of electric automobile |
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| Publication Number | Publication Date |
|---|---|
| CN113829950A true CN113829950A (en) | 2021-12-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111110853.7A Pending CN113829950A (en) | 2021-09-23 | 2021-09-23 | High-voltage battery insulation monitoring system of electric automobile |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202230137U (en) * | 2011-10-18 | 2012-05-23 | 上海恒动汽车电池有限公司 | Power cell insulation detection system for electric automobile |
| CN102749562A (en) * | 2012-07-13 | 2012-10-24 | 安徽安凯汽车股份有限公司 | Insulation monitoring device and monitoring method of power cell of electric vehicle |
| CN203894326U (en) * | 2014-04-11 | 2014-10-22 | 东莞中山大学研究院 | Insulation resistance measuring circuit and high voltage insulation monitoring system of electric vehicle |
| CN109541420A (en) * | 2018-12-25 | 2019-03-29 | 北京新能源汽车股份有限公司 | A kind of high-pressure system insulation detecting method, device and electric car |
-
2021
- 2021-09-23 CN CN202111110853.7A patent/CN113829950A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202230137U (en) * | 2011-10-18 | 2012-05-23 | 上海恒动汽车电池有限公司 | Power cell insulation detection system for electric automobile |
| CN102749562A (en) * | 2012-07-13 | 2012-10-24 | 安徽安凯汽车股份有限公司 | Insulation monitoring device and monitoring method of power cell of electric vehicle |
| CN203894326U (en) * | 2014-04-11 | 2014-10-22 | 东莞中山大学研究院 | Insulation resistance measuring circuit and high voltage insulation monitoring system of electric vehicle |
| CN109541420A (en) * | 2018-12-25 | 2019-03-29 | 北京新能源汽车股份有限公司 | A kind of high-pressure system insulation detecting method, device and electric car |
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