CN108263239B - Passive equalization circuit, fault diagnosis method and automobile - Google Patents
Passive equalization circuit, fault diagnosis method and automobile Download PDFInfo
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- CN108263239B CN108263239B CN201810128000.8A CN201810128000A CN108263239B CN 108263239 B CN108263239 B CN 108263239B CN 201810128000 A CN201810128000 A CN 201810128000A CN 108263239 B CN108263239 B CN 108263239B
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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
- B60L58/18—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules
- B60L58/20—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules having different nominal voltages
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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
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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]
- G01R31/392—Determining battery ageing or deterioration, e.g. state of health
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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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- Engineering & Computer Science (AREA)
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- General Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Secondary Cells (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention provides a passive equalization circuit, a fault diagnosis method and an automobile, and relates to the technical field of automobiles, wherein the passive equalization circuit comprises: the switch and the processor are used for acquiring a first voltage of the single battery in a first state, a second voltage of the single battery in a second state after the switch is closed and a third voltage of the single battery in a third state after the switch is disconnected; and judging whether the passive equalization circuit has a fault according to the first voltage, the second voltage and/or the third voltage. According to the invention, the first voltage, the second voltage and the third voltage of the single battery are obtained through the processor, and whether the passive equalization circuit has a fault or not is judged according to the first voltage, the second voltage and/or the third voltage, whether the passive equalization circuit has the fault or not can be judged without adding an additional circuit, the fault of the passive equalization circuit can be found in time, and the usability of the battery is ensured.
Description
Technical Field
The invention relates to the technical field of automobiles, in particular to a passive equalization circuit, a fault diagnosis method and an automobile.
Background
At present, in order to reduce the problem of available capacity reduction caused by cell consistency deviation to a battery pack, a passive equalization function is generally added to a battery management system. However, if a passive equalization circuit of the battery management system has a fault, especially when an equalization resistor is short-circuited or an equalization switch cannot be turned off, the electric quantity of the single battery is continuously consumed, so that imbalance of the battery is easily caused, and the service life of the battery is shortened.
Therefore, a passive equalization circuit, a fault diagnosis method and an automobile are needed to solve the problem that the battery is unbalanced due to continuous consumption of the battery power caused by the fault of the passive equalization circuit, so that the service life of the battery is shortened.
Disclosure of Invention
The embodiment of the invention provides a passive equalization circuit, a fault diagnosis method and an automobile, which are used for solving the problem that the service life of a battery is shortened due to unbalanced batteries caused by continuous consumption of the electric quantity of the battery due to faults of the passive equalization circuit.
To solve the above technical problem, an embodiment of the present invention provides a passive equalization circuit, including:
a single battery;
a switch connected to the battery cell;
an equalizing resistor connected to the switch;
a first port connected to the positive electrode of the battery cell;
a second port connected to a negative electrode of the unit cell;
the processor is connected with the first port and the second port and used for acquiring a first voltage between the first port and the second port when a single battery is in a first state, a second voltage between the first port and the second port when the single battery is in a second state after a switch is closed and a third voltage between the first port and the second port when the single battery is in a third state after the switch is opened; and judging whether the passive equalization circuit has a fault according to the first voltage, the second voltage and/or the third voltage.
Preferably, the first state is a state in which the electric vehicle in which the single battery is located is stationary for more than a preset time period and is powered on at a low voltage.
Preferably, the switch is connected in series with the equalizing resistance.
Preferably, the single battery is connected in parallel with the switch and the balancing resistor.
The embodiment of the invention also provides a fault diagnosis method of the passive equalization circuit, which is applied to the passive equalization circuit and comprises the following steps:
acquiring a first voltage between a first port and a second port of a single battery in a first state, a second voltage between the first port and the second port of the single battery in a second state after a switch is closed, and a third voltage between the first port and the second port of the single battery in a third state after the switch is opened;
and judging whether the passive equalization circuit has a fault or not according to the first voltage, the second voltage and/or the third voltage.
Preferably, the first state is a state in which the electric vehicle in which the single battery is located is stationary for more than a preset time period and is powered on at a low voltage.
Preferably, the determining whether the passive equalization circuit fails according to the first voltage, the second voltage and/or the third voltage includes:
when V2 is smaller than a first preset threshold value Vst, determining that the passive equalization circuit is in fault; or
Determining that the passive equalization circuit is faulty when the absolute value of V1-V2 is less than a second preset threshold Vt, and the absolute value of V3-V2 is less than Vt; or
When the absolute value of V1-V2 is greater than the third preset threshold Vt1, the absolute value of V3-V2 is greater than Vt1, and V2 is greater than Vst, it is determined that the passive equalization circuit is not malfunctioning.
Preferably, the Vt1 is greater than Vt.
Preferably, after determining that the passive equalization circuit is not faulty, the determining whether the passive equalization circuit is faulty further includes:
and when the passive equalization circuit is determined to be fault-free, carrying out high-voltage power-on.
An embodiment of the present invention further provides an automobile, including: a passive equalization circuit as described above.
Compared with the prior art, the automobile and passive equalization circuit and the fault diagnosis method provided by the embodiment of the invention have the following beneficial effects:
the first voltage, the second voltage and the third voltage of the single battery are obtained through the processor, whether the passive equalization circuit breaks down or not is judged according to the first voltage, the second voltage and/or the third voltage, whether the passive equalization circuit breaks down or not can be judged without adding an additional circuit, the faults of the passive equalization circuit can be found in time, and the usability of the battery is guaranteed.
Drawings
Fig. 1 is a circuit diagram of passive equalization according to an embodiment of the present invention;
fig. 2 is a flowchart of a fault diagnosis method of a passive equalization circuit according to an embodiment of the present invention;
fig. 3 is a specific flowchart of a fault diagnosis method for a passive equalization circuit according to an embodiment of the present invention.
Description of reference numerals:
1-single battery, 2-switch, 3-balance resistance, 4-first port, 5-second port.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments. In the following description, specific details such as specific configurations and components are provided only to help the full understanding of the embodiments of the present invention. Thus, it will be apparent to those skilled in the art that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the invention. In addition, descriptions of well-known functions and constructions are omitted for clarity and conciseness.
In various embodiments of the present invention, it should be understood that the sequence numbers of the following processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
An embodiment of the present invention provides a passive equalization circuit, referring to fig. 1, the passive equalization circuit includes: a single battery 1; a switch 2 connected to the battery cell 1; an equalizing resistor 3 connected to the switch 2; a first port 4 connected to the positive electrode of the unit battery 1; a second port 5 connected to the negative electrode of the unit cell 1; the processor is connected with the first port 4 and the second port 5 and is used for acquiring a first voltage between the first port 4 and the second port 5 when the single battery 1 is in a first state, a second voltage between the first port 4 and the second port 5 when the single battery 1 is in a second state after the switch 2 is closed, and a third voltage between the first port 4 and the second port 5 when the single battery 1 is in a third state after the switch 2 is opened; and judging whether the passive equalization circuit has a fault according to the first voltage, the second voltage and/or the third voltage.
According to the embodiment of the invention, the first voltage, the second voltage and the third voltage of the single battery 1 are obtained through the processor, and whether the passive equalization circuit has a fault or not is judged according to the first voltage, the second voltage and/or the third voltage, whether the passive equalization circuit has a fault or not can be judged without adding an additional circuit, so that the fault of the passive equalization circuit can be found in time, and the usability of the battery is guaranteed.
In a specific embodiment of the present invention, the first state is a state in which the electric vehicle in which the single battery 1 is located is stationary for more than a preset time period and is powered on at a low voltage; the preset time period can be 30 minutes, and can also be flexibly set according to actual requirements.
In an embodiment of the present invention, the switch 2 is connected in series with the equalizing resistor 3.
In a specific embodiment of the invention, the single battery 1 is connected in parallel with the switch 2 and the equalizing resistor 3, and the voltages of the single battery 1 in various states can be tested by controlling the switch 2 to be closed or closed, so that the fault reason of the equalizing circuit can be judged, and the inspection and the maintenance are convenient.
An embodiment of the present invention further provides a method for diagnosing a fault of a passive equalization circuit, which is applied to the passive equalization circuit described above, with reference to fig. 2, and includes:
the first state is a state in which the electric vehicle in which the single battery 1 is located is stationary for more than a preset time period and is powered on at a low voltage.
And step 22, after the first voltage is obtained, closing the switch 2, and obtaining a second voltage of the single battery 1 between the first port 4 and the second port 5.
And step 23, after the second voltage is obtained, turning off the switch 2, and obtaining a third voltage of the single battery 1 between the first port 4 and the second port 5.
And 24, after the third voltage is obtained, judging whether the passive equalization circuit has a fault according to the first voltage, the second voltage and/or the third voltage.
Referring to fig. 3, a specific implementation process of the above scheme is described with reference to a specific implementation flow:
the first state is a state in which the electric vehicle in which the single battery 1 is located is stationary for more than a preset time period and is powered on at a low voltage.
And step 32, after the first voltage is obtained, closing the switch 2, and obtaining a second voltage of the single battery 1 between the first port 4 and the second port 5.
And step 33, after the second voltage is obtained, turning off the switch 2, and obtaining a third voltage of the single battery 1 between the first port 4 and the second port 5.
And step 34, after the third voltage is obtained, judging whether the passive equalization circuit has a fault according to the first voltage, the second voltage and/or the third voltage.
In step 34, when V2 is smaller than a first preset threshold Vst, it is determined that the passive equalization circuit is faulty, and it may be that the equalization resistor 3 is short-circuited; when the absolute value of V1-V2 is smaller than a second preset threshold value Vt, and the absolute value of V3-V2 is smaller than Vt, determining that the passive equalization circuit is failed, and possibly that the switch 2 is failed or the equalization resistor 3 is disconnected; when the absolute value of V1-V2 is greater than the third preset threshold Vt1, the absolute value of V3-V2 is greater than Vt1, and V2 is greater than Vst, it is determined that the passive equalization circuit is not malfunctioning.
Wherein the Vt1 is greater than Vt.
The fault diagnosis method of the passive equalization circuit may further include:
And step 36, when the passive equalization circuit is determined to be fault-free, carrying out high-voltage electrification on the electric automobile.
According to the embodiment of the invention, the fault is prompted when the passive equalization circuit is in fault, so that the damage to the battery caused by the driving of the automobile when the passive equalization circuit is in fault is avoided; when the passive equalization circuit has no fault, the automobile can be normally powered on at high voltage.
An embodiment of the present invention further provides an automobile, including: a passive equalization circuit as described above.
In summary, the first voltage, the second voltage and the third voltage of the single battery 1 are obtained by the processor, and whether the passive equalization circuit has a fault or not is judged according to the first voltage, the second voltage and/or the third voltage, whether the passive equalization circuit has a fault or not can be judged without adding an additional circuit, so that the fault of the passive equalization circuit can be found in time, and the usability of the battery is guaranteed.
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 as defined in the appended claims.
Claims (6)
1. A passive equalization circuit, comprising:
a single battery (1);
a switch (2) connected to the battery cell;
an equalizing resistance (3) connected to the switch;
a first port (4) connected to the positive pole of the cell;
a second port (5) connected to the negative pole of the cell;
the processor is connected with the first port (4) and the second port (5) and is used for acquiring a first voltage between the first port (4) and the second port (5) when the single battery (1) is in a first state, a second voltage between the first port (4) and the second port (5) when the single battery (1) is in a second state after the switch (2) is closed, and a third voltage between the first port (4) and the second port (5) when the single battery (1) is in a third state after the switch (2) is opened; judging whether the passive equalization circuit has a fault or not according to the first voltage, the second voltage and/or the third voltage;
the first state is a state that the electric automobile where the single battery (1) is located is in a standing state for more than a preset time period and is electrified at low voltage;
judging whether the passive equalization circuit fails according to the first voltage, the second voltage and/or the third voltage comprises the following steps: when the second voltage is smaller than a first preset threshold value, determining that the passive equalization circuit has a fault; or when the absolute value of the difference between the first voltage and the second voltage is smaller than a second preset threshold value and the absolute value of the difference between the second voltage and the third voltage is smaller than the second preset threshold value, determining that the passive equalization circuit has a fault; or when the absolute value of the difference between the first voltage and the second voltage is greater than a third preset threshold, the absolute value of the difference between the second voltage and the third voltage is greater than the third preset threshold, and the second voltage is greater than the first preset threshold, determining that the passive equalization circuit has no fault;
the third preset threshold is greater than the second preset threshold.
2. Passive equalization circuit according to claim 1, characterized in that the switch (2) is connected in series with the equalization resistor (3).
3. Passive equalization circuit according to claim 1, characterized in that the battery cell (1) is connected in parallel with the switch (2) and the equalization resistor (3).
4. A fault diagnosis method of a passive equalization circuit, which is applied to the passive equalization circuit according to any one of claims 1 to 3, is characterized by comprising the following steps:
acquiring a first voltage V1 between the first port (4) and the second port (5) when the single battery (1) is in a first state, a second voltage V2 between the first port (4) and the second port (5) when the single battery (1) is in a second state after the switch (2) is closed, and a third voltage V3 between the first port (4) and the second port (5) when the single battery (1) is in a third state after the switch (2) is opened;
judging whether the passive equalization circuit fails according to the first voltage V1, the second voltage V2 and/or the third voltage V3;
the first state is a state that the electric automobile where the single battery (1) is located is in a standing state for more than a preset time period and is electrified at low voltage;
according to the first voltage V1, the second voltage V2 and/or the third voltage V3, judging whether the passive equalization circuit fails comprises the following steps: when the V2 is smaller than a first preset threshold value Vst, determining that the passive equalization circuit is in fault; or when the absolute value of V1-V2 is smaller than a second preset threshold value Vt and the absolute value of V3-V2 is smaller than Vt, determining that the passive equalization circuit is in failure; or when the absolute value of V1-V2 is greater than a third preset threshold value Vt1, the absolute value of V3-V2 is greater than Vt1, and V2 is greater than Vst, determining that the passive equalization circuit is not faulty;
the Vt1 is greater than Vt.
5. The method of diagnosing faults in a passive equalization circuit of claim 4 wherein, after determining that the passive equalization circuit is not faulty, said determining whether the passive equalization circuit is faulty further comprises:
and when the passive equalization circuit is determined to be fault-free, carrying out high-voltage power-on.
6. An automobile, comprising: a passive equalisation circuit according to any one of claims 1 to 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810128000.8A CN108263239B (en) | 2018-02-08 | 2018-02-08 | Passive equalization circuit, fault diagnosis method and automobile |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810128000.8A CN108263239B (en) | 2018-02-08 | 2018-02-08 | Passive equalization circuit, fault diagnosis method and automobile |
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| CN108263239A CN108263239A (en) | 2018-07-10 |
| CN108263239B true CN108263239B (en) | 2020-03-10 |
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| CN116559634B (en) * | 2023-07-11 | 2023-09-12 | 杭州华塑科技股份有限公司 | Circuit fault detection method and device, storage medium and electronic equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6518725B2 (en) * | 2000-01-28 | 2003-02-11 | Semtech Corporation | Charge balancing system |
| US20060022646A1 (en) * | 2004-07-28 | 2006-02-02 | Moore Stephen W | Method for battery cold-temperature warm-up mechanism using cell equilization hardware |
| CN202794448U (en) * | 2012-08-31 | 2013-03-13 | 惠州市亿能电子有限公司 | Failure on-line detection hardware feedback circuit of passive equalization circuit |
| CN202794479U (en) * | 2012-08-31 | 2013-03-13 | 惠州市亿能电子有限公司 | Failure on-line detection circuit of passive equalization circuit |
| CN103647332B (en) * | 2013-12-26 | 2015-09-02 | 上海航天电源技术有限责任公司 | For the conforming passive balance control system of battery maintenance group and control method |
| CN106786922B (en) * | 2016-12-29 | 2020-02-14 | 东莞钜威动力技术有限公司 | Passive equalization circuit and method of battery management system |
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