CN111257774A - Method and system for detecting direct current impedance of electric automobile - Google Patents
Method and system for detecting direct current impedance of electric automobile Download PDFInfo
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- CN111257774A CN111257774A CN202010069979.3A CN202010069979A CN111257774A CN 111257774 A CN111257774 A CN 111257774A CN 202010069979 A CN202010069979 A CN 202010069979A CN 111257774 A CN111257774 A CN 111257774A
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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]
- G01R31/389—Measuring internal impedance, internal conductance or related variables
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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
- G01R27/08—Measuring resistance by measuring both voltage and current
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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
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Abstract
The invention provides a method and a system for detecting direct current impedance of an electric automobile in the field of electric automobile detection, wherein the method comprises the following steps: step S10, setting a threshold value, charging the electric automobile, and acquiring the request current of the battery; step S20, judging whether the electric quantity of the battery is larger than or equal to the threshold value, if so, entering step S30; otherwise, the process proceeds to step S10; step S30, setting a first time length and a second time length; step S40, generating a first current pulse for the battery, continuing for a first duration, and setting a first sampling point to acquire V1 and I1; the value of the first current pulse is 0.5C or the request current; step S50, generating a second current pulse for the battery, continuing for a second duration, and setting a second sampling point to acquire V2 and I2 of the battery; the value of the second current pulse is 0.5C to 1C or the request current; and step S60, calculating the direct current impedance. The invention has the advantages that: the application range of the direct current impedance detection is greatly improved, the detection cost is reduced, and the loss of the detection process to the battery is reduced.
Description
Technical Field
The invention relates to the field of electric vehicle detection, in particular to a method and a system for detecting direct-current impedance of an electric vehicle.
Background
With the aggravation of energy crisis and environmental problems, pure electric vehicles and hybrid electric vehicles are continuously popularized, batteries are the energy sources of electric vehicles, in order to ensure good performance of the batteries and prolong the service life of the batteries, the batteries need to be regularly detected, and direct-current impedance detection is just one of detection items.
For the direct current impedance detection of an electric vehicle, the traditional method is as follows: in the process of discharging the electric automobile, two current pulses are respectively initiated, two sampling time points are taken from the two current pulses to respectively detect voltage and current, and the direct current impedance is calculated by utilizing the voltage difference and the current difference of the two sampling time points.
However, the conventional method has the following disadvantages: 1. because the charging national standard of the electric automobile has no discharge function, most electric automobiles do not have the condition of carrying out direct current impedance detection through discharge; 2. the direct current impedance detection is carried out through discharging, and a backflow prevention diode needs to be additionally arranged on the charging pile to prevent the current from flowing backwards in the discharging process; 3. in the detection process, a large current is used for generating a current pulse, and when the current pulse passes through the battery, the negative electrode of the battery is damaged to a certain extent; 4. when the charging pile is charged and discharged, the current is determined by the current request sent by a BMS (battery management system) of the electric automobile, and if the time that the actual current is greater than the current request exceeds 5 seconds, the BMS can report the overcurrent fault, so that the charging pile stops charging and discharging.
Therefore, how to provide a method and a system for detecting the direct current impedance of the electric vehicle to achieve the purposes of increasing the application range of the direct current impedance detection, reducing the detection cost and reducing the loss of the battery in the detection process becomes a problem to be solved urgently.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method and a system for detecting the direct current impedance of an electric vehicle, so that the application range of direct current impedance detection is widened, the detection cost is reduced, and the loss of a battery in the detection process is reduced.
In a first aspect, the invention provides a method for detecting direct current impedance of an electric vehicle, which comprises the following steps:
step S10, setting a threshold value, charging the battery of the electric automobile, and acquiring the request current of the battery through the BMS of the electric automobile;
step S20, judging whether the electric quantity percentage of the battery is larger than or equal to the threshold value, if so, entering step S30; if not, go to step S10;
step S30, setting a first duration and a second duration;
step S40, generating a first current pulse to the battery, continuing the first time period, and setting a first sampling point in the first time period to collect a first voltage and a first current of the battery; the value of the first current pulse is 0.5C or the request current, wherein C represents the rated current of the battery;
step S50, generating a second current pulse to the battery, continuing for the second time duration, and setting a second sampling point in the second time duration to acquire a second voltage and a second current of the battery; the value of the second current pulse is 0.5C to 1C or the request current;
and step S60, calculating the direct current impedance of the electric automobile based on the first voltage, the first current, the second voltage and the second current.
Further, in the step S10, the value of the threshold is 60%.
Further, in step S40, the value of the first current pulse is 0.5C or the request current specifically is:
the first current pulse has a value of the lesser of 0.5C and the requested current.
Further, in step S50, the value of the second current pulse is 0.5C to 1C or the request current specifically is:
the second current pulse has a value of 0.5C to 1C less than the request current.
Further, the step S60 is specifically:
dc impedance (second voltage-first voltage)/(second current-first current).
In a second aspect, the invention provides a dc impedance detection system for an electric vehicle, which includes the following modules:
the charging module is used for setting a threshold value, charging the battery of the electric automobile and acquiring the request current of the battery through the BMS of the electric automobile;
the electric quantity judging module is used for judging whether the electric quantity percentage of the battery is greater than or equal to the threshold value, and if so, entering the parameter setting module; if not, entering a charging module;
the parameter setting module is used for setting a first time length and a second time length;
the first sampling module is used for generating a first current pulse to the battery, continuing the first time length, and setting a first sampling point in the first time length to acquire a first voltage and a first current of the battery; the value of the first current pulse is 0.5C or the request current, wherein C represents the rated current of the battery;
the second sampling module is used for generating a second current pulse for the battery, lasting for the second time length, and setting a second sampling point in the second time length to acquire a second voltage and a second current of the battery; the value of the second current pulse is 0.5C to 1C or the request current;
and the direct current impedance calculation module is used for calculating the direct current impedance of the electric automobile based on the first voltage, the first current, the second voltage and the second current.
Further, in the charging module, the value of the threshold is 60%.
Further, in the first sampling module, the value of the first current pulse is 0.5C or the request current is specifically:
the first current pulse has a value of the lesser of 0.5C and the requested current.
Further, in the second sampling module, the value of the second current pulse is 0.5C to 1C or the request current specifically is:
the second current pulse has a value of 0.5C to 1C less than the request current.
Further, the dc impedance calculating module specifically includes:
dc impedance (second voltage-first voltage)/(second current-first current).
The invention has the advantages that:
by carrying out direct current impedance detection in the charging process of the electric automobile, compared with the traditional method of carrying out direct current impedance detection in the discharging process of the electric automobile, some electric automobiles do not have the discharging function, and the application range of the direct current impedance detection is greatly improved; a backflow prevention diode is not required to be additionally arranged on the charging pile, so that the current backflow in the discharging process is prevented, the communication protocol of the electric automobile is not required to be modified, and the detection cost of the direct current impedance detection is greatly reduced; by acquiring the request current of the battery, when the value of the first current pulse or the second current pulse is larger than the request current, the value of the first current pulse or the second current pulse is set as the value of the request current, so that the battery is prevented from being damaged by overlarge current, and the BMS is prevented from reporting overcurrent faults.
Drawings
The invention will be further described with reference to the following examples with reference to the accompanying drawings.
FIG. 1 is a flow chart of a method for detecting DC impedance of an electric vehicle according to the present invention.
Fig. 2 is a schematic structural diagram of a dc impedance detection system of an electric vehicle according to the present invention.
FIG. 3 is a schematic diagram of the detection process pulses of the present invention.
Detailed Description
The technical scheme in the embodiment of the application has the following general idea: change direct current impedance detection into by discharging to charge in order to promote and detect application scope, avoid the repacking to fill electric pile with reduce cost, establish the maximum value of first current pulse and second current pulse into the solicited current of BMS, avoid haring the battery.
Referring to fig. 1 to 3, a preferred embodiment of a dc impedance detection method for an electric vehicle according to the present invention includes the following steps:
step S10, setting a threshold value, charging the battery of the electric automobile, and acquiring the request current of the battery through the BMS of the electric automobile;
step S20, judging whether the electric quantity percentage of the battery is larger than or equal to the threshold value, if so, entering step S30; if not, go to step S10;
step S30, setting a first duration and a second duration; the first time length and the second time length are preferably 20 seconds;
step S40, generating a first current pulse to the battery, continuing the first time period, and setting a first sampling point in the first time period to collect a first voltage and a first current of the battery; the value of the first current pulse is 0.5C or the request current, wherein C represents the rated current of the battery;
step S50, generating a second current pulse to the battery, continuing for the second time duration, and setting a second sampling point in the second time duration to acquire a second voltage and a second current of the battery; the value of the second current pulse is 0.5C to 1C or the request current; the first and second sampling points are preferably 10 seconds;
step S60, calculating the direct current impedance of the electric automobile based on the first voltage, the first current, the second voltage and the second current; and after the direct current impedance detection is finished, continuously charging the battery to full charge.
In the step S10, the value of the threshold is 60%, and by setting the threshold, the dc impedance detection is avoided when the battery power is too low, so that the battery is protected.
In step S40, the value of the first current pulse is 0.5C or the request current is specifically:
the value of the first current pulse is the smaller of 0.5C and the request current; for example, if the request current is 0.6C, the value of the first current pulse is 0.5C.
In step S50, the value of the second current pulse is 0.5C to 1C or the request current is specifically:
the value of the second current pulse is the smaller value of 0.5C to 1C and the request current; for example, if the value of the second current pulse is 0.8C and the value of the request current is 0.7C, the value of the second current pulse is set to 0.7C.
The step S60 specifically includes:
dc impedance (second voltage-first voltage)/(second current-first current).
For example, the value of the request current is 0.6C, when the electric quantity of the battery is charged to 60%, a first current pulse with the value of 0.5C is generated for the battery and lasts for 20 seconds, and a first voltage V1 and a first current I1 of the battery are collected at the 10 th second; and after the first current pulse is finished, generating a second current pulse with the value of 0.6C for the battery for 20 seconds, and acquiring a second voltage V2 and a second current I2 of the battery at the 10 th second, wherein the direct current impedance is (V2-V1)/(I2-I1).
The invention discloses a preferred embodiment of a direct current impedance detection system of an electric automobile, which comprises the following modules:
the charging module is used for setting a threshold value, charging the battery of the electric automobile and acquiring the request current of the battery through the BMS of the electric automobile;
the electric quantity judging module is used for judging whether the electric quantity percentage of the battery is greater than or equal to the threshold value, and if so, entering the parameter setting module; if not, entering a charging module;
the parameter setting module is used for setting a first time length and a second time length; the first time length and the second time length are preferably 20 seconds;
the first sampling module is used for generating a first current pulse to the battery, continuing the first time length, and setting a first sampling point in the first time length to acquire a first voltage and a first current of the battery; the value of the first current pulse is 0.5C or the request current, wherein C represents the rated current of the battery;
the second sampling module is used for generating a second current pulse for the battery, lasting for the second time length, and setting a second sampling point in the second time length to acquire a second voltage and a second current of the battery; the value of the second current pulse is 0.5C to 1C or the request current; the first and second sampling points are preferably 10 seconds;
the direct current impedance calculation module is used for calculating the direct current impedance of the electric automobile based on the first voltage, the first current, the second voltage and the second current; and after the direct current impedance detection is finished, continuously charging the battery to full charge.
In the charging module, the value of the threshold is 60%, and through setting the threshold, the direct current impedance detection is avoided when the electric quantity of the battery is too low, so that the battery is protected.
In the first sampling module, the value of the first current pulse is 0.5C or the request current is specifically:
the value of the first current pulse is the smaller of 0.5C and the request current; for example, if the request current is 0.6C, the value of the first current pulse is 0.5C.
In the second sampling module, the value of the second current pulse is 0.5C to 1C or the request current is specifically:
the value of the second current pulse is the smaller value of 0.5C to 1C and the request current; for example, if the value of the second current pulse is 0.8C and the value of the request current is 0.7C, the value of the second current pulse is set to 0.7C.
The direct current impedance calculation module specifically comprises:
dc impedance (second voltage-first voltage)/(second current-first current).
For example, the value of the request current is 0.6C, when the electric quantity of the battery is charged to 60%, a first current pulse with the value of 0.5C is generated for the battery and lasts for 20 seconds, and a first voltage V1 and a first current I1 of the battery are collected at the 10 th second; and after the first current pulse is finished, generating a second current pulse with the value of 0.6C for the battery for 20 seconds, and acquiring a second voltage V2 and a second current I2 of the battery at the 10 th second, wherein the direct current impedance is (V2-V1)/(I2-I1).
In summary, the invention has the advantages that:
by carrying out direct current impedance detection in the charging process of the electric automobile, compared with the traditional method of carrying out direct current impedance detection in the discharging process of the electric automobile, some electric automobiles do not have the discharging function, and the application range of the direct current impedance detection is greatly improved; a backflow prevention diode is not required to be additionally arranged on the charging pile, so that the current backflow in the discharging process is prevented, the communication protocol of the electric automobile is not required to be modified, and the detection cost of the direct current impedance detection is greatly reduced; by acquiring the request current of the battery, when the value of the first current pulse or the second current pulse is larger than the request current, the value of the first current pulse or the second current pulse is set as the value of the request current, so that the battery is prevented from being damaged by overlarge current, and the BMS is prevented from reporting overcurrent faults.
Although specific embodiments of the invention have been described above, it will be understood by those skilled in the art that the specific embodiments described are illustrative only and are not limiting upon the scope of the invention, and that equivalent modifications and variations can be made by those skilled in the art without departing from the spirit of the invention, which is to be limited only by the appended claims.
Claims (10)
1. A direct current impedance detection method for an electric vehicle is characterized by comprising the following steps: the method comprises the following steps:
step S10, setting a threshold value, charging the battery of the electric automobile, and acquiring the request current of the battery through the BMS of the electric automobile;
step S20, judging whether the electric quantity percentage of the battery is larger than or equal to the threshold value, if so, entering step S30; if not, go to step S10;
step S30, setting a first duration and a second duration;
step S40, generating a first current pulse to the battery, continuing the first time period, and setting a first sampling point in the first time period to collect a first voltage and a first current of the battery; the value of the first current pulse is 0.5C or the request current, wherein C represents the rated current of the battery;
step S50, generating a second current pulse to the battery, continuing for the second time duration, and setting a second sampling point in the second time duration to acquire a second voltage and a second current of the battery; the value of the second current pulse is 0.5C to 1C or the request current;
and step S60, calculating the direct current impedance of the electric automobile based on the first voltage, the first current, the second voltage and the second current.
2. The direct current impedance detection method of the electric automobile according to claim 1, characterized in that: in step S10, the threshold value is 60%.
3. The direct current impedance detection method of the electric automobile according to claim 1, characterized in that: in step S40, the value of the first current pulse is 0.5C or the request current is specifically:
the first current pulse has a value of the lesser of 0.5C and the requested current.
4. The direct current impedance detection method of the electric automobile according to claim 1, characterized in that: in step S50, the value of the second current pulse is 0.5C to 1C or the request current is specifically:
the second current pulse has a value of 0.5C to 1C less than the request current.
5. The direct current impedance detection method of the electric automobile according to claim 1, characterized in that: the step S60 specifically includes:
dc impedance (second voltage-first voltage)/(second current-first current).
6. The utility model provides an electric automobile direct current impedance detection system which characterized in that: the system comprises the following modules:
the charging module is used for setting a threshold value, charging the battery of the electric automobile and acquiring the request current of the battery through the BMS of the electric automobile;
the electric quantity judging module is used for judging whether the electric quantity percentage of the battery is greater than or equal to the threshold value, and if so, entering the parameter setting module; if not, entering a charging module;
the parameter setting module is used for setting a first time length and a second time length;
the first sampling module is used for generating a first current pulse to the battery, continuing the first time length, and setting a first sampling point in the first time length to acquire a first voltage and a first current of the battery; the value of the first current pulse is 0.5C or the request current, wherein C represents the rated current of the battery;
the second sampling module is used for generating a second current pulse for the battery, lasting for the second time length, and setting a second sampling point in the second time length to acquire a second voltage and a second current of the battery; the value of the second current pulse is 0.5C to 1C or the request current;
and the direct current impedance calculation module is used for calculating the direct current impedance of the electric automobile based on the first voltage, the first current, the second voltage and the second current.
7. The direct current impedance detection system of the electric vehicle as claimed in claim 6, wherein: in the charging module, the value of the threshold is 60%.
8. The direct current impedance detection system of the electric vehicle as claimed in claim 6, wherein: in the first sampling module, the value of the first current pulse is 0.5C or the request current is specifically:
the first current pulse has a value of the lesser of 0.5C and the requested current.
9. The direct current impedance detection system of the electric vehicle as claimed in claim 6, wherein: in the second sampling module, the value of the second current pulse is 0.5C to 1C or the request current is specifically:
the second current pulse has a value of 0.5C to 1C less than the request current.
10. The direct current impedance detection system of the electric vehicle as claimed in claim 6, wherein: the direct current impedance calculation module specifically comprises:
dc impedance (second voltage-first voltage)/(second current-first current).
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| WO2024099011A1 (en) * | 2022-11-10 | 2024-05-16 | 宁德时代新能源科技股份有限公司 | Battery direct current resistance estimation method and apparatus |
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