CN112684361B - Battery insulation resistance detection method, device and system - Google Patents
Battery insulation resistance detection method, device and system Download PDFInfo
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- CN112684361B CN112684361B CN202110096644.5A CN202110096644A CN112684361B CN 112684361 B CN112684361 B CN 112684361B CN 202110096644 A CN202110096644 A CN 202110096644A CN 112684361 B CN112684361 B CN 112684361B
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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
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- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Abstract
The invention discloses a method, a device and a system for detecting battery insulation resistance. The detection method comprises the steps of controlling an insulation detection relay to be closed according to the high-voltage state on the whole vehicle; acquiring a first resistance value of an insulation detection variable resistor; after the first preset time, acquiring a first voltage value of the primary positive end and a first voltage value of the primary negative end; adjusting the resistance value of the insulation detection variable resistor; acquiring a second resistance value of the insulation detection variable resistor; after a second preset time, acquiring a second voltage value of the primary positive terminal and a second voltage value of the primary negative terminal; and then, the main positive end insulation resistor and the main negative end insulation resistor are calculated according to the first resistance value of the insulation detection variable resistor, the first voltage value of the main positive end, the first voltage value of the main negative end, the second resistance value of the insulation detection variable resistor, the second voltage value of the main positive end and the second voltage value of the main negative end, so that the simplified measurement and calculation of the detection insulation resistor are realized.
Description
Technical Field
The embodiment of the invention relates to an insulation resistance detection technology, in particular to a battery insulation resistance detection method, device and system.
Background
With the popularization of new energy vehicles and the wider application of electric vehicles, the safety of automobiles is also receiving more and more attention. Generally, the insulation between the power battery and the vehicle body is likely to be problematic due to various reasons, such as the extension of the service life of the power battery, and the deterioration of the power battery itself or its connection wires.
At present, two methods for detecting the insulation resistance of the electric automobile in China exist, one is to adopt a signal injection method for measurement, and the other is to adopt external resistance switching measurement. The signal injection method is to inject a direct current voltage signal with a certain frequency into a battery system of the electric automobile, and calculate the insulation resistance by measuring the fed back direct current signal, and the signal can generate ripple interference on the whole battery system to influence the normal work of the system. The basic principle of the existing external resistance switching measurement method, such as the unbalanced bridge method, for measuring the insulation resistance is that a series of resistors are connected between a direct current battery and a grounding shell, the magnitude of the resistance is switched in through a relay, and the magnitude of the insulation resistance of the positive and negative poles of the battery to the ground is calculated by measuring different voltage values on each resistor and writing an equation set in a column. The measuring method has the advantages of complex detection process and low detection precision, and simultaneously reduces the insulation performance of the battery system and increases the power consumption of the battery system due to the fact that the measuring resistor is connected for a long time.
Disclosure of Invention
The invention provides a method, a device and a system for detecting insulation resistance of a battery, which are used for realizing simplified measurement and calculation of the insulation resistance.
In a first aspect, an embodiment of the present invention provides a method for detecting insulation resistance of a battery, where the method for detecting insulation resistance of a battery includes:
controlling an insulation detection relay to be closed according to the high-voltage state on the whole vehicle;
acquiring a first resistance value of an insulation detection variable resistor;
after the first preset time, acquiring a first voltage value of the primary positive end and a first voltage value of the primary negative end;
adjusting the resistance value of the insulation detection variable resistor;
acquiring a second resistance value of the insulation detection variable resistor;
after a second preset time, acquiring a second voltage value of the primary positive terminal and a second voltage value of the primary negative terminal;
and calculating a primary positive terminal insulation resistor and a primary negative terminal insulation resistor according to the first resistance value of the insulation detection variable resistor, the first voltage value of the primary positive terminal, the first voltage value of the primary negative terminal, the second resistance value of the insulation detection variable resistor, the second voltage value of the primary positive terminal and the second voltage value of the primary negative terminal.
Optionally, the method for detecting insulation resistance of a battery further includes:
when the on-state of the insulation detection relay is kept for more than a third preset time, controlling the insulation detection relay to be switched off;
judging whether the disconnection maintenance of the insulation detection relay is longer than a fourth preset time;
when the insulation detection relay is disconnected and kept for more than the fourth preset time, determining the detection period of the insulation resistance of the battery;
wherein the third preset time is equal to the sum of the first preset time and the second preset time;
and the detection period of the battery insulation resistance is equal to the sum of the third preset time and the fourth preset time.
Optionally: the high-voltage state on the whole vehicle comprises high voltage on the whole vehicle and no high voltage on the whole vehicle;
controlling an insulation detection relay to be closed according to the high-voltage state on the whole vehicle; the method comprises the following steps:
controlling the insulation detection relay to be closed according to the high voltage on the whole vehicle;
after the first preset time, acquiring a first voltage value of the primary positive end and a first voltage value of the primary negative end; the method comprises the following steps:
after the first terminal is preset for time, acquiring a first voltage value of the positive primary terminal and a first voltage value of the negative primary terminal;
after a second preset time, acquiring a second voltage value of the primary positive terminal and a second voltage value of the primary negative terminal; the method comprises the following steps:
and after the third sub-preset time, acquiring a second voltage value of the main positive terminal and a second voltage value of the main negative terminal.
Optionally, the high-voltage state on the whole vehicle comprises high voltage on the whole vehicle and no high voltage on the whole vehicle;
controlling an insulation detection relay to be closed according to the integral voltage state on the whole vehicle; the method comprises the following steps:
controlling the insulation detection relay to be closed according to the non-high voltage of the whole vehicle;
after the first preset time, acquiring a first voltage value of the primary positive end and a first voltage value of the primary negative end; the method comprises the following steps:
after the second terminal is preset for time, acquiring a first voltage value of the primary positive terminal and a first voltage value of the primary negative terminal;
after a second preset time, acquiring a second voltage value of the primary positive terminal and a second voltage value of the primary negative terminal; the method comprises the following steps:
and after the fourth terminal is preset for time, acquiring a second voltage value of the primary positive terminal and a second voltage value of the primary negative terminal.
Optionally, when the on-state of the insulation detection relay is kept for more than a third preset time, the insulation detection relay is controlled to be switched off; the method comprises the following steps:
when the closing of the insulation detection relay is kept for more than the fifth preset time, controlling the insulation detection relay to be opened;
judging whether the disconnection maintenance of the insulation detection relay is longer than a fourth preset time; the method comprises the following steps:
judging whether the disconnection holding time of the insulation detection relay is longer than a seventh preset time;
when the insulation detection relay is disconnected and kept for more than the fourth preset time, determining the detection period of the insulation resistance of the battery; the method comprises the following steps:
when the insulation detection relay is disconnected and kept for more than the seventh preset time, determining a first period of battery insulation resistance detection;
wherein the fifth sub-preset time is equal to the sum of the first sub-preset time and the third sub-preset time;
the first period of the battery insulation resistance detection is equal to the sum of the fifth sub-preset time and the seventh sub-preset time.
Optionally, when the on/off state of the insulation detection relay is kept for more than a third preset time, the insulation detection relay is controlled to be switched off; the method comprises the following steps:
when the on-state of the insulation detection relay is kept for more than the sixth preset time, controlling the insulation detection relay to be switched off;
judging whether the disconnection maintenance of the insulation detection relay is longer than a fourth preset time; the method comprises the following steps:
judging whether the disconnection holding time of the insulation detection relay is longer than the eighth preset time;
when the insulation detection relay is disconnected and kept for more than a fourth preset time, determining the detection period of the insulation resistance of the battery; the method comprises the following steps:
when the insulation detection relay is disconnected and kept for more than the eighth preset time, determining a second period of battery insulation resistance detection;
wherein the sixth sub preset time is equal to the sum of the second sub preset time and the fourth sub preset time;
and the second period of the battery insulation resistance detection is equal to the sum of the sixth preset sub-time and the eighth preset sub-time.
In a second aspect, an embodiment of the present invention further provides a power insulation resistance detection apparatus, where the power insulation resistance detection apparatus includes:
a relay closing module: the relay is used for controlling the insulation detection relay to be closed according to the high-voltage state on the whole vehicle;
a first resistance value acquisition module: the first resistance value is used for obtaining the insulation detection variable resistance;
the first voltage value acquisition module: after the first preset time, acquiring a first voltage value of the primary positive terminal and a first voltage value of the primary negative terminal;
a resistance value adjusting module: the resistance value of the insulation detection variable resistor is adjusted;
a second resistance value acquisition module: the second resistance value is used for obtaining the insulation detection variable resistor;
a second voltage value acquisition module: after the second preset time, acquiring a second voltage value of the primary positive terminal and a second voltage value of the primary negative terminal;
an insulation resistance calculation module: and the primary positive terminal insulation resistor and the primary negative terminal insulation resistor are calculated according to the first resistance value of the insulation detection variable resistor, the first voltage value of the primary positive terminal, the first voltage value of the primary negative terminal, the second resistance value of the insulation detection variable resistor, the second voltage value of the primary positive terminal and the second voltage value of the primary negative terminal.
Optionally, the power insulation resistance detection device further includes:
insulation detection relay disconnection module: the insulation detection relay is used for controlling the insulation detection relay to be disconnected when the on-state of the insulation detection relay is kept for more than a third preset time;
a judging module: the device is used for judging whether the disconnection and the maintenance of the insulation detection relay are more than a fourth preset time;
a period determination module: and the detection device is used for determining the detection period of the insulation resistance of the battery after the insulation detection relay is disconnected and kept for more than the fourth preset time.
In a third aspect, an embodiment of the present invention further provides a battery insulation resistance detection system, where the system includes an insulation detection relay, an insulation detection variable resistor, a voltage sensor, and a controller; the controller includes the battery insulation resistance detection device according to the second aspect;
the first end of the insulation detection relay is electrically connected with the first end of the insulation detection variable resistor, and the second end of the insulation detection relay is a grounding end; the second end of the insulation detection variable resistor is respectively and electrically connected with the first end of the primary positive end insulation resistor and the first end of the primary negative end insulation resistor,
the second end of the primary positive end insulation resistor is electrically connected with the positive electrode end of the battery; the second end of the main and negative end insulation resistor is electrically connected with the negative end of the battery;
the voltage sensor is used for acquiring the voltage value of a main positive terminal between the positive terminal of the battery and the grounding terminal; the voltage acquisition module is also used for acquiring the voltage value of a main negative terminal between the negative terminal of the battery and the grounding terminal; the voltage value of the primary positive end and the voltage value of the primary negative end are sent to the controller;
the controller is used for controlling the insulation detection relay to be closed according to the high voltage state on the whole vehicle and acquiring a first resistance value of the insulation detection variable resistor; after a first preset time, acquiring a first voltage value of the primary positive terminal and a first voltage value of the primary negative terminal;
the insulation detection variable resistor is also used for adjusting the resistance value of the insulation detection variable resistor; and acquiring a second resistance value of the insulation detection variable resistor; after a second preset time, acquiring a second voltage value of the primary positive terminal and a second voltage value of the primary negative terminal;
and the insulation detection variable resistor is also used for calculating a primary positive end insulation resistor and a primary negative end insulation resistor according to the first resistance value of the insulation detection variable resistor, the first voltage value of the primary positive end, the second voltage value of the primary negative end, the second resistance value of the insulation detection variable resistor, the second voltage value of the primary positive end and the second voltage value of the primary negative end.
Optionally, the insulation detection variable resistor is an insulation detection digital variable resistor.
According to the invention, the insulation detection relay is controlled to be closed according to the high-voltage state on the whole vehicle; acquiring a first resistance value of an insulation detection variable resistor; after the first preset time, acquiring a first voltage value of the primary positive end and a first voltage value of the primary negative end; then adjusting the resistance value of the insulation detection variable resistor; acquiring a second resistance value of the insulation detection variable resistor; after a second preset time, acquiring a second voltage value of the primary positive end and a second voltage value of the primary negative end; then, the main positive end insulation resistor and the main negative end insulation resistor are calculated according to the first resistance value of the insulation detection variable resistor, the first voltage value of the main positive end, the first voltage value of the main negative end, the second resistance value of the insulation detection variable resistor, the second voltage value of the main positive end and the second voltage value of the main negative end, so that the calculation of the main positive end insulation resistor and the main negative end insulation resistor can be calculated according to the simultaneous equation of the voltage value of the main positive end, the voltage value of the main negative end and the numerical value of the insulation detection variable resistor, the simplified measurement and calculation of the detection insulation resistor are realized, and the problems that the size of the insulation resistor of the positive pole and the negative pole of the battery to the ground is calculated by switching a plurality of relays and calculating the voltage values of the plurality of resistors in the prior art are solved, so that the detection process is complicated, the detection precision is low and the like are solved.
Drawings
Fig. 1 is a flowchart of a method for detecting insulation resistance of a battery according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a battery insulation resistance detection circuit according to an embodiment of the present invention;
fig. 3 is a flowchart of another method for detecting insulation resistance of a battery according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a power insulation detection apparatus according to a second embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is a flowchart of a method for detecting insulation resistance of a battery according to an embodiment of the present invention, where the embodiment is applicable to a situation of detecting insulation resistance of a battery, and the method may be executed by a device for detecting insulation resistance of a battery, as shown in fig. 1, the method specifically includes the following steps:
s110, controlling an insulation detection relay to be closed according to the high-voltage state on the whole vehicle;
fig. 2 is a working schematic diagram of a battery insulation resistance detection circuit according to a first embodiment of the present invention, and as shown in fig. 2, the battery insulation resistance detection circuit includes an insulation detection relay K1 and an insulation detection variable resistor R; a first end of the insulation detection relay K1 is electrically connected with a first end of the insulation detection variable resistor R, and a second end of the insulation detection relay K1 is a grounding end; the second end of the insulation detection variable resistor R is electrically connected with the first end of the primary positive end insulation resistor R1 and the first end of the primary negative end insulation resistor R2 respectively, and the second end of the primary positive end insulation resistor R1 is electrically connected with the positive electrode end of the battery; the second end of the positive and negative terminal insulation resistor R2 is electrically connected to the negative terminal of the battery. Compared with the prior art, the insulation detection variable resistor R is simplified into one insulation detection variable resistor R and the insulation detection relays are simplified into one insulation detection relay K1, so that the insulation resistance detection circuit is relatively simplified, and the insulation resistance detection process is simpler; the battery insulation resistance detection method is suitable for a battery insulation detection system, the system comprises a battery insulation detection circuit, a voltage sensor and a controller, and in the insulation detection resistance process, the controller controls an insulation detection relay K to be closed according to the high-voltage state on the whole vehicle. The high-voltage state on the whole vehicle comprises an upper high voltage and a lower high voltage, and the upper high voltage is a state that the battery supplies power to electrical equipment through the closing of a high-voltage relay; the high-voltage relay is disconnected when the high voltage is not applied, and the battery does not supply power to the electrical equipment. The controller controls the insulation detection relay K to be closed when the high voltage is applied and the high voltage is not applied.
S120, acquiring a first resistance value of the insulation detection variable resistor;
the insulation detection variable resistor R can be designed into a digital variable resistor, and the controller can control the change of the insulation detection variable resistor; the first resistance value of the insulation detection variable resistor is a resistance value before the insulation detection variable resistor is not changed, which is read from the battery management system by the controller.
S130, after a first preset time, acquiring a first voltage value of the positive end and a first voltage value of the negative end;
the first voltage value of the main positive terminal is the voltage difference between the positive electrode of the battery and the ground terminal; the first voltage value of the main and negative terminals is the voltage difference between the negative pole of the battery and the grounding terminal; after the insulation detection relay K is controlled to be closed, the first voltage value of the main positive end and the first voltage value of the main negative end are unstable due to the influence of external capacitors in the battery management system; after the first preset time, namely after the first preset time is delayed, the stable first voltage value of the main positive terminal and the stable first voltage value of the main negative terminal can be obtained from the voltage sensor, so that the insulation resistance can be accurately measured.
S140, adjusting the resistance value of the insulation detection variable resistor;
s150, acquiring a second resistance value of the insulation detection variable resistor;
s160, after a second preset time, acquiring a second voltage value of the primary positive end and a second voltage value of the primary negative end;
the controller controls the insulation detection variable resistor to adjust the resistance value, then obtains a second resistance value of the adjusted insulation detection variable resistor, and obtains a second voltage value of the stable main positive terminal and a second voltage value of the main negative terminal after a second preset time; thereby realizing the subsequent accurate measurement of the insulation resistance.
S170, calculating a primary positive end insulation resistor and a primary negative end insulation resistor according to the first resistance value of the insulation detection variable resistor, the first voltage value of the primary positive end, the first voltage value of the primary negative end, the second resistance value of the insulation detection variable resistor, the second voltage value of the primary positive end and the second voltage value of the primary negative end.
According to the technical scheme, after the insulation detection relay K is controlled to be closed, the main positive end voltage value and the main negative end voltage value are acquired in a delayed mode, then the resistance value of the insulation detection variable resistor R is accurately adjusted, the main positive end voltage value and the main negative end voltage value are acquired in a delayed mode, the insulation resistance value can be calculated according to the voltage values measured twice and the numerical simultaneous equations of the insulation variable resistor measured twice, and the measurement and calculation of the insulation detection resistor are simplified.
Optionally, on the basis of the above embodiment, the period of detecting the insulation resistance is further accurately calculated on the basis of the insulation detection resistance; fig. 3 is a flowchart of another method for detecting insulation resistance of a battery according to an embodiment of the present invention; as shown in fig. 3, the detection method includes:
s210, controlling an insulation detection relay to be closed according to the high-voltage state on the whole vehicle;
s220, acquiring a first resistance value of the insulation detection variable resistor;
s230, after a first preset time, acquiring a first voltage value of the positive end and a first voltage value of the negative end;
s240, adjusting the resistance value of the insulation detection variable resistor;
s250, acquiring a second resistance value of the insulation detection variable resistor;
s260, after a second preset time, acquiring a second voltage value of the primary positive end and a second voltage value of the primary negative end;
s270, calculating a primary positive end insulation resistor and a primary negative end insulation resistor according to the first resistance value of the insulation detection variable resistor, the first voltage value of the primary positive end, the first voltage value of the primary negative end, the second resistance value of the insulation detection variable resistor, the second voltage value of the primary positive end and the second voltage value of the primary negative end.
S280, when the on-state of the insulation detection relay is kept for more than a third preset time, controlling the insulation detection relay to be switched off;
the third preset time is equal to the sum of the first preset time and the second preset time; and after the insulation resistance detection is finished, the insulation detection relay is controlled to be disconnected so as to prolong the service life of the insulation detection relay.
S290, judging whether the disconnection and the maintenance of the insulation detection relay are more than a fourth preset time;
s300, when the insulation detection relay is disconnected and kept for more than a fourth preset time, determining the detection period of the insulation resistance of the battery;
and the detection period of the insulation resistance of the battery is equal to the sum of the third preset time and the fourth preset time. Under the high-voltage state on different whole cars, the cycle that battery insulation resistance detected is different. According to the technical scheme, on the basis of realizing the insulation detection resistance, the calculation of the insulation detection resistance period under the high-voltage state on different finished automobiles can be realized.
Specifically, the high-voltage state on the whole vehicle comprises high voltage on the whole vehicle and no high voltage on the whole vehicle; the insulation resistance detection method comprises the following steps of:
controlling the insulation detection relay to be closed according to the high voltage on the whole vehicle;
after the first terminal is preset for time, acquiring a first voltage value of the positive primary terminal and a first voltage value of the negative primary terminal;
after the third sub-preset time, acquiring a second voltage value of the main positive terminal and a second voltage value of the main negative terminal;
when the on-state of the insulation detection relay is kept for more than the fifth preset time, controlling the insulation detection relay to be switched off;
judging whether the disconnection holding time of the insulation detection relay is more than the seventh preset time;
when the insulation detection relay is disconnected and kept for more than the seventh preset time, determining a first period of battery insulation resistance detection;
wherein the fifth sub-preset time is equal to the sum of the first sub-preset time and the third sub-preset time; the first period of the battery insulation resistance detection is equal to the sum of the fifth sub preset time and the seventh sub preset time. Exemplarily, the first sub preset time and the third sub preset time are set to be 500ms in total; the seventh preset time is 500 ms; when the whole vehicle is under high voltage, the detection period of the insulation resistance is 1000 ms.
Specifically, the high-voltage state on the whole vehicle comprises high voltage on the whole vehicle and no high voltage on the whole vehicle; when the high voltage is not applied, the insulation resistance detection method comprises the following steps:
controlling the insulation detection relay to be closed according to the low voltage on the whole vehicle;
after the second terminal is preset for time, acquiring a first voltage value of the primary positive terminal and a first voltage value of the primary negative terminal;
and after the fourth terminal is preset for time, acquiring a second voltage value of the main positive terminal and a second voltage value of the main negative terminal.
When the on-state of the insulation detection relay is kept for more than the sixth preset time, controlling the insulation detection relay to be switched off;
judging whether the disconnection holding time of the insulation detection relay is longer than the eighth preset time;
when the insulation detection relay is disconnected and kept for more than the eighth preset time, determining a second period of battery insulation resistance detection;
wherein the sixth sub-preset time is equal to the sum of the second sub-preset time and the fourth sub-preset time; and the second period of the battery insulation resistance detection is equal to the sum of the sixth preset sub-time and the eighth preset sub-time. Exemplarily, the second sub preset time and the fourth sub preset time are set to be 150 ms; the eighth preset time is 150 ms; when the whole vehicle is not applied with high voltage, the detection period of the insulation resistance is 300 ms; it can be understood that when the whole vehicle is not subjected to high voltage, the period of insulation resistance detection is short, and the initialization process of the battery management system can be started in a short time so as to quickly start the subsequent battery power supply process.
Example two
The power insulation resistance detection device provided by the second embodiment of the invention can execute the power insulation resistance detection method provided by the first embodiment of the invention, and has corresponding functional modules and beneficial effects of the execution method. Fig. 4 is a schematic structural diagram of a power insulation detection apparatus according to a second embodiment of the present invention, and as shown in fig. 4, the apparatus includes:
relay closing module 10: the relay is used for controlling the insulation detection relay to be closed according to the high-voltage state on the whole vehicle;
first resistance value acquisition module 20: the first resistance value is used for obtaining the insulation detection variable resistance;
the first voltage value acquisition module 30: after the first preset time, acquiring a first voltage value of the primary positive end and a first voltage value of the primary negative end;
the resistance value adjusting module 40: the resistance value of the insulation detection variable resistor is adjusted;
the second resistance value acquisition module 50: the second resistance value is used for obtaining the insulation detection variable resistor;
the second voltage value acquisition module 60: after the second preset time, acquiring a second voltage value of the primary positive end and a second voltage value of the primary negative end;
insulation resistance calculation module 70: the primary positive end insulation resistance and the primary negative end insulation resistance are calculated according to a first resistance value of the insulation detection variable resistance, a first voltage value of the primary positive end and a first voltage value of the primary negative end, a second resistance value of the insulation detection variable resistance, a second voltage value of the primary positive end and a second voltage value of the primary negative end.
Optionally, the apparatus further comprises:
insulation detection relay disconnection module: the insulation detection relay is controlled to be switched off when the on-state of the insulation detection relay is kept for more than a third preset time;
a judging module: the device is used for judging whether the disconnection and the maintenance of the insulation detection relay are more than the fourth preset time or not;
a period determination module: and the detection device is used for determining the detection period of the insulation resistance of the battery after the insulation detection relay is disconnected and kept for more than the fourth preset time.
Optionally: the high-voltage state on the whole vehicle comprises high voltage on the whole vehicle and no high voltage on the whole vehicle;
relay closing module 10: the relay closing detection device is specifically used for controlling the insulation detection relay to be closed according to the high voltage on the whole vehicle;
the first voltage value acquisition module 30: specifically, after the first sub-preset time, acquiring a first voltage value of the main positive terminal and a first voltage value of the main negative terminal;
the second voltage value acquisition module 60: specifically, after the third sub-preset time, the second voltage value of the primary positive terminal and the second voltage value of the primary negative terminal are obtained.
Optionally, the high-voltage state on the whole vehicle comprises high voltage on the whole vehicle and no high voltage on the whole vehicle;
relay closing module 10: the system is also specifically used for controlling the insulation detection relay to be closed according to the non-high voltage of the whole vehicle;
the first voltage value acquisition module 30: the method is also specifically used for acquiring a first voltage value of the primary positive terminal and a first voltage value of the primary negative terminal after the second terminal is preset for time;
the second voltage value acquisition module 60: and the second voltage value of the main positive terminal and the second voltage value of the main negative terminal are obtained after the fourth terminal is preset for time.
Optionally, the insulation detection relay disconnection module: the control circuit is specifically used for controlling the insulation detection relay to be switched off when the on/off state of the insulation detection relay is kept for more than a fifth preset time;
a judging module: the method is specifically used for judging whether the disconnection and the maintenance of the insulation detection relay are more than the seventh preset time;
a period determination module: the method is particularly used for determining a first period of battery insulation resistance detection after the insulation detection relay is disconnected and kept for more than the seventh preset time;
wherein the fifth sub-preset time is equal to the sum of the first sub-preset time and the third sub-preset time;
the first period of the battery insulation resistance detection is equal to the sum of the fifth sub-preset time and the seventh sub-preset time.
Optionally, the insulation detection relay disconnection module: the relay protection circuit is further specifically used for controlling the insulation detection relay to be switched off when the on and off of the insulation detection relay is kept for more than the sixth preset time;
a judging module: the device is also specifically used for judging whether the disconnection and the maintenance of the insulation detection relay are more than the eighth preset time;
a period determination module: the system is further specifically configured to determine a second period of battery insulation resistance detection after the insulation detection relay is turned off for more than the eighth preset time;
wherein the sixth sub preset time is equal to the sum of the second sub preset time and the fourth sub preset time;
and the second period of the battery insulation resistance detection is equal to the sum of the sixth preset sub-time and the eighth preset sub-time.
EXAMPLE III
The embodiment of the invention also provides a battery insulation resistance detection system, which can be applied to a battery insulation resistance detection method and has the beneficial effects of the first embodiment, and the description is omitted here. The system comprises an insulation detection relay, an insulation detection variable resistor, a voltage sensor and a controller; the controller comprises the battery insulation resistance detection device of the second embodiment;
the first end of the insulation detection relay is electrically connected with the first end of the insulation detection variable resistor, and the second end of the insulation detection relay is a grounding end; the second end of the insulation detection variable resistor is respectively and electrically connected with the first end of the insulation resistor at the positive end and the first end of the insulation resistor at the negative end,
the second end of the primary positive end insulation resistor is electrically connected with the positive electrode end of the battery; the second end of the primary and negative end insulation resistor is electrically connected with the negative end of the battery;
the voltage sensor is used for acquiring the voltage value of a main positive terminal between the positive terminal and the grounding terminal of the battery; the voltage acquisition module is also used for acquiring the voltage value of a main negative terminal between the negative terminal and the grounding terminal of the battery; the voltage value of the positive end and the voltage value of the negative end are sent to the controller;
the controller is used for controlling the insulation detection relay to be closed according to the high-voltage state on the whole vehicle and acquiring a first resistance value of the insulation detection variable resistor; after the first preset time, acquiring a first voltage value of the primary positive end and a first voltage value of the primary negative end;
the resistance value of the insulation detection variable resistor is also adjusted; and obtaining a second resistance value of the insulation detection variable resistor; and after a second preset time, acquiring a second voltage value of the main positive terminal and a second voltage value of the main negative terminal
And the primary positive end insulation resistor and the primary negative end insulation resistor are calculated according to the first resistance value of the insulation detection variable resistor, the first voltage value of the primary positive end, the second voltage value of the primary negative end, the second resistance value of the insulation detection variable resistor, the second voltage value of the primary positive end and the second voltage value of the primary negative end.
Optionally, the insulation detection variable resistor is an insulation detection digital variable resistor.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments illustrated herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (8)
1. A battery insulation resistance detection method is characterized by comprising the following steps:
controlling an insulation detection relay to be closed according to the high-voltage state on the whole vehicle;
acquiring a first resistance value of an insulation detection variable resistor;
after the first preset time, acquiring a first voltage value of the primary positive end and a first voltage value of the primary negative end;
adjusting the resistance value of the insulation detection variable resistor;
acquiring a second resistance value of the insulation detection variable resistor;
after a second preset time, acquiring a second voltage value of the primary positive terminal and a second voltage value of the primary negative terminal;
calculating a primary positive terminal insulation resistance and a primary negative terminal insulation resistance according to a first resistance value of the insulation detection variable resistance, a first voltage value of the primary positive terminal, a first voltage value of the primary negative terminal, a second resistance value of the insulation detection variable resistance, a second voltage value of the primary positive terminal and a second voltage value of the primary negative terminal;
when the on-state of the insulation detection relay is kept for more than a third preset time, controlling the insulation detection relay to be switched off;
judging whether the off-hold time of the insulation detection relay is longer than a fourth preset time;
when the insulation detection relay is disconnected and kept for more than the fourth preset time, determining the detection period of the insulation resistance of the battery;
wherein the third preset time is equal to the sum of the first preset time and the second preset time;
and the detection period of the battery insulation resistance is equal to the sum of the third preset time and the fourth preset time.
2. The battery insulation resistance detection method according to claim 1, characterized in that: the high-voltage state on the whole vehicle comprises high voltage on the whole vehicle and no high voltage on the whole vehicle;
controlling an insulation detection relay to be closed according to the high-voltage state on the whole vehicle; the method comprises the following steps:
controlling the insulation detection relay to be closed according to the high voltage on the whole vehicle;
after the first preset time, acquiring a first voltage value of the primary positive end and a first voltage value of the primary negative end; the method comprises the following steps:
after the first terminal is preset for time, acquiring a first voltage value of the positive primary terminal and a first voltage value of the negative primary terminal;
after a second preset time, acquiring a second voltage value of the primary positive terminal and a second voltage value of the primary negative terminal; the method comprises the following steps:
and after the third terminal is preset for time, acquiring a second voltage value of the main positive terminal and a second voltage value of the main negative terminal.
3. The battery insulation resistance detection method according to claim 1, wherein the high voltage state on the entire vehicle includes a high voltage on the entire vehicle and a no high voltage on the entire vehicle;
controlling an insulation detection relay to be closed according to the high-voltage state on the whole vehicle; the method comprises the following steps:
controlling the insulation detection relay to be closed according to the non-high voltage of the whole vehicle;
after the first preset time, acquiring a first voltage value of the primary positive end and a first voltage value of the primary negative end; the method comprises the following steps:
after the second terminal is preset for time, acquiring a first voltage value of the primary positive terminal and a first voltage value of the primary negative terminal;
after a second preset time, acquiring a second voltage value of the primary positive terminal and a second voltage value of the primary negative terminal; the method comprises the following steps:
and after the fourth terminal is preset for time, acquiring a second voltage value of the primary positive terminal and a second voltage value of the primary negative terminal.
4. The battery insulation resistance detection method according to claim 2,
when the on-state of the insulation detection relay is kept for more than a third preset time, controlling the insulation detection relay to be switched off; the method comprises the following steps:
when the on-state of the insulation detection relay is kept for more than the fifth preset time, controlling the insulation detection relay to be switched off;
judging whether the disconnection maintenance of the insulation detection relay is longer than a fourth preset time; the method comprises the following steps:
judging whether the disconnection holding time of the insulation detection relay is more than a seventh preset time;
when the insulation detection relay is disconnected and kept for more than the fourth preset time, determining the detection period of the insulation resistance of the battery; the method comprises the following steps:
when the insulation detection relay is disconnected and kept for more than the seventh preset time, determining a first period of battery insulation resistance detection;
wherein the fifth sub-preset time is equal to the sum of the first sub-preset time and the third sub-preset time;
the first period of the battery insulation resistance detection is equal to the sum of the fifth sub-preset time and the seventh sub-preset time.
5. The battery insulation resistance detection method according to claim 3, wherein when the insulation detection relay is closed for more than a third preset time, the insulation detection relay is controlled to be opened; the method comprises the following steps:
when the on-state of the insulation detection relay is kept for more than the sixth preset time, controlling the insulation detection relay to be switched off;
judging whether the off-hold time of the insulation detection relay is longer than a fourth preset time; the method comprises the following steps:
judging whether the disconnection holding time of the insulation detection relay is longer than the eighth preset time;
when the insulation detection relay is disconnected and kept for more than the fourth preset time, determining the detection period of the insulation resistance of the battery; the method comprises the following steps:
when the insulation detection relay is disconnected and kept for more than the eighth preset time, determining a second period of battery insulation resistance detection;
wherein the sixth sub preset time is equal to the sum of the second sub preset time and the fourth sub preset time;
and the second period of the battery insulation resistance detection is equal to the sum of the sixth sub-preset time and the eighth sub-preset time.
6. A battery insulation resistance detection device, characterized by comprising:
a relay closing module: the relay is used for controlling the insulation detection relay to be closed according to the high-voltage state on the whole vehicle;
a first resistance value acquisition module: the first resistance value is used for obtaining the insulation detection variable resistance;
the first voltage value acquisition module: after the first preset time, acquiring a first voltage value of the primary positive end and a first voltage value of the primary negative end;
a resistance value adjusting module: the resistance value of the insulation detection variable resistor is adjusted;
a second resistance value acquisition module: the second resistance value is used for obtaining the insulation detection variable resistor;
the second voltage value acquisition module: after a second preset time, acquiring a second voltage value of the primary positive terminal and a second voltage value of the primary negative terminal;
an insulation resistance calculation module: a primary positive terminal insulation resistor and a primary negative terminal insulation resistor are calculated according to a first resistance value of the insulation detection variable resistor, a first voltage value of the primary positive terminal, a first voltage value of the primary negative terminal, a second resistance value of the insulation detection variable resistor, a second voltage value of the primary positive terminal and a second voltage value of the primary negative terminal;
insulation detection relay disconnection module: the insulation detection relay is used for controlling the insulation detection relay to be disconnected when the on-state of the insulation detection relay is kept for more than a third preset time;
a judgment module: the device is used for judging whether the disconnection and the maintenance of the insulation detection relay are more than a fourth preset time;
a period determination module: and the detection device is used for determining the detection period of the insulation resistance of the battery after the insulation detection relay is disconnected and kept for more than the fourth preset time.
7. A battery insulation resistance detection system is characterized by comprising an insulation detection relay, an insulation detection variable resistor, a voltage sensor and a controller; the controller includes the battery insulation resistance detection device of claim 6;
the first end of the insulation detection relay is electrically connected with the first end of the insulation detection variable resistor, and the second end of the insulation detection relay is a grounding end; the second end of the insulation detection variable resistor is respectively and electrically connected with the first end of the primary positive end insulation resistor and the first end of the primary negative end insulation resistor,
the second end of the primary positive terminal insulation resistor is electrically connected with the positive terminal of the battery; the second end of the primary and negative end insulation resistor is electrically connected with the negative end of the battery;
the voltage sensor is used for acquiring the voltage value of a main positive terminal between the positive terminal of the battery and the grounding terminal; the voltage acquisition module is also used for acquiring the voltage value of a main negative terminal between the negative terminal of the battery and the grounding terminal; the voltage value of the primary positive end and the voltage value of the primary negative end are sent to the controller;
the controller is used for controlling the insulation detection relay to be closed according to the high voltage state on the whole vehicle and acquiring a first resistance value of the insulation detection variable resistor; after a first preset time, acquiring a first voltage value of the primary positive terminal and a first voltage value of the primary negative terminal;
the insulation detection variable resistor is also used for adjusting the resistance value of the insulation detection variable resistor; and acquiring a second resistance value of the insulation detection variable resistor; after a second preset time, acquiring a second voltage value of the primary positive terminal and a second voltage value of the primary negative terminal;
and the insulation detection variable resistor is used for calculating a first resistance value of the insulation detection variable resistor, a first voltage value of the primary positive terminal, a first voltage value of the primary negative terminal, a second resistance value of the insulation detection variable resistor, a second voltage value of the primary positive terminal and a second voltage value of the primary negative terminal.
8. The battery insulation resistance detection system according to claim 7, wherein the insulation detection variable resistor is an insulation detection digital variable resistor.
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| JP6391608B2 (en) * | 2016-02-10 | 2018-09-19 | 株式会社デンソーテン | Anomaly detection device and anomaly detection method |
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| JP6919161B2 (en) * | 2016-08-05 | 2021-08-18 | 日産自動車株式会社 | Insulation detection device and detection system |
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| CN109752665A (en) * | 2019-03-22 | 2019-05-14 | 上海度普新能源科技有限公司 | A kind of battery pack insulation detecting circuit and detection method |
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| CN104142475A (en) * | 2013-05-06 | 2014-11-12 | 广州汽车集团股份有限公司 | Device and method for evaluating insulation detecting module |
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