CN109733198B - Main contactor adhesion detection method and device, power battery system and vehicle - Google Patents
Main contactor adhesion detection method and device, power battery system and vehicle Download PDFInfo
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- CN109733198B CN109733198B CN201811457615.1A CN201811457615A CN109733198B CN 109733198 B CN109733198 B CN 109733198B CN 201811457615 A CN201811457615 A CN 201811457615A CN 109733198 B CN109733198 B CN 109733198B
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Abstract
The embodiment of the application discloses a method and a device for detecting adhesion of a main contactor, a power battery system and a vehicle, wherein the method comprises the following steps: acquiring a stable voltage value of direct current buses at two ends of a power battery when the power battery is in a power-on state; receiving a power-off command, and controlling the main contactor to be disconnected according to the power-off command to obtain a dropping voltage value after the voltage on the direct current bus is dropped; obtaining a discharge curve of the power battery based on the drop voltage value and the stable voltage value, wherein the discharge curve represents the change relation of the voltage value on the direct current bus along with time; whether the main contactor is adhered or not is determined based on the discharge curve, the adhesion of the main contactor of the power battery is detected in real time, the adhesion state of the contactor in the power battery is accurately judged, and the safety of the system is improved.
Description
Technical Field
The application relates to the technical field of power battery systems, in particular to a method and a device for detecting adhesion of a main contactor, a power battery system and a vehicle.
Background
In the existing power battery system in the market, the contactor can not be powered off after being adhered, so that power is out of control, light persons damage an electric control part, and heavy persons cause personal injury, and therefore the state of the contactor needs to be detected. However, the detection of the state of the contactor, particularly the adhesion state when the main contactor controls the connection and disconnection of the high-voltage loop, is a technical problem. The adhesion detection method for the main contactor provided by the prior art cannot effectively judge the adhesion state of the main contactor and the negative contactor. When the hardware is implemented, a detection point at the motor end needs to be added, so that the cost is high. When the method is realized through software, the high-voltage power-on time needs to be prolonged, and the experience is poor.
Disclosure of Invention
The embodiment of the application provides a main contactor adhesion detection technology.
According to an aspect of an embodiment of the present application, there is provided a main contactor adhesion detection method, including:
acquiring a stable voltage value of direct current buses at two ends of a power battery when the power battery is in a power-on state;
receiving a power-off instruction, and controlling the main contactor to be disconnected according to the power-off instruction to obtain a dropping voltage value after the voltage on the direct current bus is dropped;
obtaining a discharge curve of the power battery based on the drop voltage value and the stable voltage value, wherein the discharge curve represents the change relation of the voltage value on the direct current bus along with time;
determining whether the main contactor is stuck based on the discharge curve.
Optionally, in any one of the method embodiments described above, before obtaining the discharge curve of the power battery based on the droop voltage value and the steady voltage value, the method further includes:
and acquiring a standard discharge curve corresponding to the power battery, wherein the standard discharge curve is a normal discharge curve of the main contactor without adhesion, and the standard discharge curve is used for representing the relation between the stable voltage value and the falling voltage value and the time.
Optionally, in any one of the method embodiments described above, before obtaining the discharge curve of the power battery based on the droop voltage value and the steady voltage value, the method further includes:
acquiring the dropping time from a stable voltage value to the dropping voltage value and the duration time of the dropping voltage value in the standard discharge curve;
the obtaining of the discharge curve of the power battery based on the droop voltage value and the steady voltage value comprises:
and obtaining a discharge curve of the power battery based on the drop voltage value, the stable voltage value, the drop time and the duration time, wherein the discharge curve takes time as a horizontal axis and voltage as a vertical axis.
Optionally, in any one of the method embodiments described above, the determining whether the main contactor is stuck based on the discharge curve includes:
comparing the discharge curve with the standard discharge curve to obtain a comparison result;
determining whether the main contactor is stuck based on the comparison result.
Optionally, in any one of the method embodiments of the present application, the determining whether the main contactor is stuck based on the comparison result includes:
determining that the main contactor is not stuck in response to the comparison result indicating that the discharge curve coincides with the standard discharge curve;
and determining that the main contactor is stuck in response to the comparison result indicating that the discharge curve is not coincident with the standard discharge curve.
Optionally, in any one of the method embodiments described above, the comparing the discharge curve with the standard discharge curve to obtain a comparison result includes:
comparing a curve segment of the discharge curve corresponding to the duration time in the discharge curve with a standard curve segment of the discharge curve corresponding to the duration time in the standard discharge curve, wherein the standard curve segment is represented as a line segment;
and obtaining a comparison result of whether the curve segment is coincident with the standard curve segment.
Optionally, in any of the above method embodiments of the present application, the main contactor comprises a main positive contactor and a main negative contactor; the curve segment comprises a positive curve segment and a negative curve segment, the positive curve segment corresponds to the judgment time of the main positive contactor, and the negative curve segment corresponds to the judgment time of the main negative contactor;
the standard curve section comprises a positive standard curve section and a negative standard curve section, the positive standard curve section corresponds to the judging time of the main positive contactor, and the negative standard curve section corresponds to the judging time of the main negative contactor.
Optionally, in any one of the method embodiments of the present application, the comparing the discharge curve with a standard discharge curve to obtain a comparison result, and determining whether the main contactor is stuck based on the comparison result includes:
comparing the positive curve segment with the positive standard curve segment, and determining whether the main positive contactor is adhered or not according to whether the positive curve segment is overlapped with the positive standard curve segment or not;
and comparing the negative curve segment with the negative standard curve segment, and determining whether the main contactor and the negative contactor are adhered or not according to whether the negative curve segment is overlapped with the negative standard curve segment or not.
Optionally, in any one of the method embodiments of the present application, the obtaining a stable voltage value of the dc bus at two ends of the power battery when the power battery is in the power-on state includes:
acquiring a stable voltage value of direct current buses at two ends of the power battery when the power battery is in a power-on state by using a voltage sensor in a battery management system;
the obtaining of the falling voltage value after the voltage on the direct current bus is reduced includes:
and acquiring a dropping voltage value after the voltage on the direct current bus is dropped by using a voltage sensor in the battery management system.
Optionally, in any of the above method embodiments of the present application, the method further includes:
and displaying the discharge curve through a display device.
According to another aspect of the embodiments of the present application, there is provided a main contactor adhesion detection apparatus including:
the voltage sensor is used for acquiring a stable voltage value of a direct current bus at two ends of a power battery when the power battery is in an electrified state, and acquiring a dropping voltage value after voltage on the direct current bus drops;
the controller is used for receiving a power-off command and controlling the main contactor to be disconnected according to the power-off command;
the curve determining unit is used for obtaining a discharge curve of the power battery based on the drop voltage value and the stable voltage value, and the discharge curve represents the change relation of the voltage value on the direct current bus along with time;
and the judging unit is used for determining whether the main contactor is adhered or not based on the discharge curve.
Optionally, in any one of the apparatus embodiments described above in the present application, the apparatus further includes:
and the standard curve unit is used for acquiring a standard discharge curve corresponding to the power battery, the standard discharge curve is a normal discharge curve of the main contactor without adhesion, and the standard discharge curve is used for representing the relationship between the stable voltage value and the falling voltage value and the time.
Optionally, in any one of the apparatus embodiments described above in the present application, the apparatus further includes:
the time acquisition unit is used for acquiring the dropping time from the stable voltage value to the dropping voltage value in the standard discharge curve and the continuous time of the dropping voltage value;
the curve determining unit is specifically configured to obtain a discharge curve of the power battery based on the droop voltage value, the steady voltage value, the droop time, and the duration, where the discharge curve takes time as a horizontal axis and voltage as a vertical axis.
Optionally, in any one of the apparatus embodiments of the present application, the determining unit is specifically configured to compare the discharge curve with the standard discharge curve to obtain a comparison result; determining whether the main contactor is stuck based on the comparison result.
Optionally, in any one of the apparatus embodiments of the present application, when determining whether the main contactor is stuck based on the comparison result, the determining unit is specifically configured to determine that the main contactor is not stuck in response to the comparison result indicating that the discharge curve coincides with the standard discharge curve; and determining that the main contactor is stuck in response to the comparison result indicating that the discharge curve is not coincident with the standard discharge curve.
Optionally, in an embodiment of any one of the above-mentioned apparatuses of the present application, when the determining unit compares the discharge curve with the standard discharge curve to obtain a comparison result, the determining unit is specifically configured to compare a curve segment of the discharge curve corresponding to the duration in the discharge curve with a standard curve segment of the standard discharge curve corresponding to the duration in the standard discharge curve, where the standard curve segment is represented as a line segment; and obtaining a comparison result of whether the curve segment is coincident with the standard curve segment.
Optionally, in any of the above apparatus embodiments of the present application, the main contactor comprises a main positive contactor and a main negative contactor; the curve segment comprises a positive curve segment and a negative curve segment, the positive curve segment corresponds to the judgment time of the main positive contactor, and the negative curve segment corresponds to the judgment time of the main negative contactor;
the standard curve section comprises a positive standard curve section and a negative standard curve section, the positive standard curve section corresponds to the judging time of the main positive contactor, and the negative standard curve section corresponds to the judging time of the main negative contactor.
Optionally, in an embodiment of any one of the above apparatuses of the present application, the determining unit is specifically configured to compare the positive curve segment with the positive standard curve segment, and determine whether the main positive contactor is stuck according to whether the positive curve segment is overlapped with the positive standard curve segment; and comparing the negative curve segment with the negative standard curve segment, and determining whether the main contactor and the negative contactor are adhered or not according to whether the negative curve segment is overlapped with the negative standard curve segment or not.
Optionally, in any of the apparatus embodiments described above, the voltage sensor is a voltage sensor in a battery management system.
Optionally, in any one of the apparatus embodiments described above in the present application, the apparatus further includes:
and the display device is used for displaying the discharge curve.
According to yet another aspect of an embodiment of the present application, there is provided a power battery system, comprising: power battery and the main contactor adhesion detection device of any one of above-mentioned.
According to still another aspect of an embodiment of the present application, there is provided a vehicle including: the main contactor adhesion detection device of any one of the above items or the power battery system as described above.
Based on the method and the device for detecting the adhesion of the main contactor, the power battery system and the vehicle provided by the embodiment of the application, the stable voltage value of the direct current buses at two ends of the power battery when the power battery is in the power-on state is obtained; receiving a power-off command, and controlling the main contactor to be disconnected according to the power-off command to obtain a dropping voltage value after the voltage on the direct current bus is dropped; obtaining a discharge curve of the power battery based on the drop voltage value and the stable voltage value, wherein the discharge curve represents the change relation of the voltage value on the direct current bus along with time; whether the main contactor is adhered or not is determined based on the discharge curve, the adhesion of the main contactor of the power battery is detected in real time, the adhesion state of the contactor in the power battery is accurately judged, and the safety of the system is improved.
The technical solution of the present application is further described in detail by the accompanying drawings and examples.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description, serve to explain the principles of the application.
The present application may be more clearly understood from the following detailed description with reference to the accompanying drawings, in which:
fig. 1 is a flowchart of a method for detecting adhesion of a main contactor according to an embodiment of the present disclosure.
Fig. 2 is a schematic diagram of a standard discharge curve in another embodiment of the main contactor adhesion detection method provided in the embodiment of the present application.
Fig. 3 is a schematic structural diagram of a main contactor adhesion detection device according to an embodiment of the present application.
Detailed Description
Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise.
Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the application, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
The contactor is a passive actuator, and in practical applications, the contactor has problems in design and manufacturing quality. The main reasons that may cause the adhesion are: the contactor (such as a relay and the like) has large current at the closing moment, and is generally caused by capacitive loads (a motor controller, a DCDC, an air conditioner compressor, a charger and the like) without pre-charging or insufficient pre-charging; when the contactor is disconnected, large current exists, and the contactor is normally powered off abnormally when the motor does not stop working; when the battery pack is in a short circuit condition, a large current is generated, and the relay contact is likely to be bounced open by electric repulsion force in a closed state so as to be arc-drawn.
Fig. 1 is a flowchart of a method for detecting adhesion of a main contactor according to an embodiment of the present disclosure. The method may be performed by any electronic device, such as a terminal device, a server, a mobile device, a vehicle-mounted device, and so on. As shown in fig. 1, the method of this embodiment includes:
and step 110, acquiring a stable voltage value of the direct current buses at the two ends of the power battery when the power battery is in an electrified state.
Alternatively, the power battery may be a power battery in a vehicle, and the power battery may be a lithium battery pack or other battery packs, and the application is not limited to the specific form of the power battery. Optionally, in the embodiment of the present application, a voltage sensor is used to acquire a voltage on the dc bus to obtain a stable voltage value of the dc bus in the power-on state, and the voltage sensor may be a voltage sensor in the battery management system or a separately arranged voltage sensor.
And step 120, receiving a power-off command, controlling the main contactor to be disconnected according to the power-off command, and obtaining a dropping voltage value after the voltage on the direct current bus drops.
When receiving the power-off instruction, the power-off of the power battery is executed, the main contactor needs to be disconnected, the voltage change on the direct current bus in the disconnection process and the drop voltage value after the power-off are obtained, at the moment, if the main contactor is adhered, the drop voltage value is different from the drop voltage value of the normal power-off, and the obtained drop voltage value and the drop voltage value of the normal power-off can be compared to determine whether the contactor is adhered or not.
And step 130, obtaining a discharge curve of the power battery based on the drop voltage value and the stable voltage value.
The discharge curve represents the change relation of the voltage value on the direct current bus along with time; optionally, a voltage drop process may exist in the main contactor in the disconnection process, which is reflected in a discharge curve, and a drop curve may appear.
And step 140, determining whether the main contactor is stuck or not based on the discharge curve.
According to the method for detecting the adhesion of the main contactor, provided by the embodiment of the application, the stable voltage value of the direct current buses at two ends of the power battery when the power battery is in the power-on state is obtained; receiving a power-off command, and controlling the main contactor to be disconnected according to the power-off command to obtain a dropping voltage value after the voltage on the direct current bus is dropped; obtaining a discharge curve of the power battery based on the drop voltage value and the stable voltage value, wherein the discharge curve represents the change relation of the voltage value on the direct current bus along with time; whether the main contactor is adhered or not is determined based on the discharge curve, the adhesion of the main contactor of the power battery is detected in real time, the adhesion state of the contactor in the power battery is accurately judged, and the safety of the system is improved.
In one or more optional embodiments, before obtaining the discharge curve of the power battery based on the droop voltage value and the steady voltage value, the method further includes:
and acquiring a standard discharge curve corresponding to the power battery, wherein the standard discharge curve is a normal discharge curve of the main contactor without adhesion, and the standard discharge curve is used for representing the relation between the stable voltage value and the drop voltage value and the time.
Optionally, in order to determine whether the main contactor is normally opened, a discharge curve of the main contactor in the case of being normally opened needs to be known first, and since the discharge curves of different power batteries may be different, in the embodiment of the present application, a standard discharge curve of the power battery in a normal case may be collected under the condition that it is ensured that the main contactor is not adhered (for example, when the power battery is initially shipped from a factory), so as to ensure that whether the main contactor is adhered or not may be identified.
Optionally, before obtaining the discharge curve of the power battery based on the droop voltage value and the steady voltage value, the method further includes:
obtaining the dropping time from the stable voltage value to the dropping voltage value and the duration time of the dropping voltage value in the standard discharge curve;
obtaining a discharge curve of the power battery based on the drop voltage value and the stable voltage value, comprising:
and obtaining a discharge curve of the power battery based on the drop voltage value, the stable voltage value, the drop time and the duration time, wherein the discharge curve takes time as a horizontal axis and voltage as a vertical axis.
Fig. 2 is a schematic diagram of a standard discharge curve in another embodiment of the main contactor adhesion detection method provided in the embodiment of the present application. As shown in fig. 2, in the closed state of the main contactor, the voltage of the battery dc bus is maintained at a stable voltage value of X volts, and when a power-off command is received, the main contactor is controlled to be turned off, and at this time, the voltage on the battery dc bus starts to drop, which is represented by a curve in a time period a (corresponding to the drop time in the above embodiment) in the figure, and indicates that the voltage of the dc bus drops by Y volts from X volts in the time period a, and at this time, the obtained drop voltage value is X-Y volts; after the voltage is decreased, the dropping voltage value continues for a b time period (corresponding to the duration in the above embodiment), and the voltage value on the dc bus is unchanged during the b time period, and by comparing the discharge curves in the b time period, the embodiment of the present application can determine whether the main contactor is stuck, that is, the state of the main contactor in the b time period is the diagnostic state. Alternatively, Y in fig. 2 is 20% of the pack voltage, a is the drop time 300ms, b is the adhesion detection time, and X is the maximum detection voltage interval 350-400 volts.
In one or more alternative embodiments, determining whether the main contactor is stuck based on the discharge curve includes:
comparing the discharge curve with a standard discharge curve to obtain a comparison result;
whether the main contactor is stuck is determined based on the comparison result.
According to the embodiment of the application, when the standard discharge curve and the currently obtained discharge curve are known, whether the main contactor is adhered or not is determined by comparing the curves, the judging method is simple and easy to implement, the method can be realized without complex equipment, and the judging accuracy and speed are improved.
Optionally, determining whether the main contactor is stuck based on the comparison result includes:
responding to the comparison result that the discharge curve is superposed with the standard discharge curve, and determining that the main contactor is not adhered;
and determining that the main contactor is stuck in response to the comparison result indicating that the discharge curve is not coincident with the standard discharge curve.
Since the standard discharge curve represents a discharge curve in a case where the main contactor is not stuck, if the obtained discharge curve coincides with the standard discharge curve, it is indicated that the main contactor is not stuck.
Optionally, comparing the discharge curve with a standard discharge curve to obtain a comparison result, including:
comparing a curve segment of the discharge curve corresponding to the duration time in the discharge curve with a standard curve segment of the discharge curve corresponding to the duration time in the standard discharge curve, wherein the standard curve segment is represented as a line segment;
and obtaining a comparison result of whether the curve segment is overlapped with the standard curve segment.
No matter whether the main contactor is adhered or not, the voltage of the direct current bus is the same in the closed state and when the main contactor starts to be disconnected, therefore, the obtained discharge curve is superposed with the standard discharge curve in the closed state and the drop time, comparison is not needed for the two curves, and the curve section corresponding to the duration time and the standard curve section are mainly compared to determine whether the main contactor is adhered or not.
Optionally, the main contactors include a main positive contactor and a main negative contactor; the curve section comprises a positive curve section and a negative curve section, the positive curve section corresponds to the judgment time of the main positive contactor, and the negative curve section corresponds to the judgment time of the main negative contactor;
the standard curve section comprises a positive standard curve section and a negative standard curve section, the positive standard curve section corresponds to the judgment time of the main positive contactor, and the negative standard curve section corresponds to the judgment time of the main negative contactor.
Compare the curve of discharging with the standard curve of discharging, obtain the contrast result, whether the main contactor adhesion is confirmed based on the contrast result, include:
comparing the positive curve segment with the positive standard curve segment, and determining whether the main positive contactor is adhered or not according to whether the positive curve segment is overlapped with the positive standard curve segment or not;
and comparing the negative curve segment with the negative standard curve segment, and determining whether the main and negative contactors are adhered or not according to whether the negative curve segment is overlapped with the negative standard curve segment or not.
Optionally, the voltage is extracted for cross comparison through the sequence of the disconnection of the contactors when the power battery system is powered down, and the detection condition of the adhesion of the contactors is established. In the power battery power-off process, the disconnection of the main positive contactor and the main negative contactor has a sequence, and under the condition that the disconnection sequence is known, the corresponding positive curve segment is compared with the positive standard curve segment, and the negative curve segment is compared with the negative standard curve segment, so that whether the main positive contactor is adhered or the main negative contactor is adhered is determined. Optionally, when the main positive contactor is normally disconnected, the voltage of the positive end of the inverter is approximately equal to the slope voltage value discharged by the motor controller in the whole battery voltage minus millisecond time; when the main negative contactor is normally disconnected, the voltage of the positive end of the inverter is a floating voltage due to the loss of the reference ground, and the voltage of the reference ground is the floating voltage. When the main positive contactor is adhered, the voltage of the positive end of the inverter is approximately equal to the voltage of the whole battery; when the main negative contactor is stuck, the voltage of the positive end of the inverter is approximately equal to the voltage of the whole battery. The reference ground voltage is close to zero potential and the direct current loop has small current; by adopting the detection method, the adhesion condition of the main contactor can be directly detected when the power battery is powered off; and the testing accuracy is high and the cost is low.
In one or more alternative embodiments, step 110 includes:
acquiring a stable voltage value of direct current buses at two ends of a power battery when the power battery is in a power-on state by using a voltage sensor in a battery management system;
step 120 includes:
and acquiring a dropping voltage value after the voltage on the direct current bus is dropped by using a voltage sensor in the battery management system.
The voltage value on the direct current bus is acquired through the voltage sensor in the BATTERY management system (Battery MANAGEMENT SYSTEM, BMS), and the corresponding BATTERY management system is usually configured when the power BATTERY is used, so that the original equipment is utilized, the equipment cost does not need to be increased, and the detection performability is improved.
In one or more optional embodiments, the method provided in this embodiment of the present application further includes:
the discharge curve is displayed by the display device.
According to the embodiment of the application, the display device can be used for carrying out coincidence comparison on the discharge curve and the standard discharge curve, so that the adhesion identification of the main contactor is more visual.
Those of ordinary skill in the art will understand that: all or part of the steps for implementing the method embodiments may be implemented by hardware related to program instructions, and the program may be stored in a computer readable storage medium, and when executed, the program performs the steps including the method embodiments; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Fig. 3 is a schematic structural diagram of a main contactor adhesion detection device according to an embodiment of the present application. The apparatus of this embodiment may be used to implement the method embodiments described above in this application. As shown in fig. 3, the apparatus of this embodiment includes:
and the voltage sensor 31 is configured to acquire a stable voltage value of the dc bus at two ends of the power battery when the power battery is in an electrified state, and acquire a drop voltage value after voltage on the dc bus drops.
And the controller 32 is used for receiving the power-off command and controlling the main contactor to be disconnected according to the power-off command.
The curve determining unit 33 is configured to obtain a discharge curve of the power battery based on the droop voltage value and the stable voltage value, where the discharge curve represents a change relationship of the voltage value on the dc bus with time;
and a judging unit 34 for determining whether the main contactor is stuck based on the discharge curve.
According to the adhesion detection device for the main contactor provided by the embodiment of the application, the stable voltage value of the direct current buses at two ends of the power battery when the power battery is in the power-on state is obtained; receiving a power-off command, and controlling the main contactor to be disconnected according to the power-off command to obtain a dropping voltage value after the voltage on the direct current bus is dropped; obtaining a discharge curve of the power battery based on the drop voltage value and the stable voltage value, wherein the discharge curve represents the change relation of the voltage value on the direct current bus along with time; whether the main contactor is adhered or not is determined based on the discharge curve, the adhesion of the main contactor of the power battery is detected in real time, the adhesion state of the contactor in the power battery is accurately judged, and the safety of the system is improved.
In one or more optional embodiments, the apparatus provided in this application embodiment further includes:
and the standard curve unit is used for acquiring a standard discharge curve corresponding to the power battery, the standard discharge curve is a normal discharge curve of the main contactor without adhesion, and the standard discharge curve is used for representing the relation between the stable voltage value and the drop voltage value and the time.
Optionally, in order to determine whether the main contactor is normally opened, a discharge curve of the main contactor in the case of being normally opened needs to be known first, and since the discharge curves of different power batteries may be different, in the embodiment of the present application, a standard discharge curve of the power battery in a normal case may be collected under the condition that it is ensured that the main contactor is not adhered (for example, when the power battery is initially shipped from a factory), so as to ensure that whether the main contactor is adhered or not may be identified.
Optionally, the apparatus provided in this embodiment of the present application further includes:
the time acquisition unit is used for acquiring the dropping time from the stable voltage value to the dropping voltage value and the continuous duration time of the dropping voltage value in the standard discharge curve;
the curve determining unit 33 is specifically configured to obtain a discharge curve of the power battery based on the droop voltage value, the steady voltage value, the droop time, and the duration, where the discharge curve takes time as a horizontal axis and takes voltage as a vertical axis.
In one or more optional embodiments, the determining unit 34 is specifically configured to compare the discharge curve with a standard discharge curve to obtain a comparison result; whether the main contactor is stuck is determined based on the comparison result.
According to the embodiment of the application, when the standard discharge curve and the currently obtained discharge curve are known, whether the main contactor is adhered or not is determined by comparing the curves, the judging method is simple and easy to implement, the method can be realized without complex equipment, and the judging accuracy and speed are improved.
Optionally, the judging unit 34 is specifically configured to, when determining whether the main contactor is stuck based on the comparison result, determine that the main contactor is not stuck in response to the comparison result indicating that the discharge curve coincides with the standard discharge curve; and determining that the main contactor is stuck in response to the comparison result indicating that the discharge curve is not coincident with the standard discharge curve.
Optionally, the determining unit 34 is specifically configured to compare a curve segment of the discharge curve corresponding to the duration in the discharge curve with a standard curve segment of the discharge curve corresponding to the duration in the standard discharge curve when comparing the discharge curve with the standard discharge curve to obtain a comparison result, where the standard curve segment is represented as a line segment; and obtaining a comparison result of whether the curve segment is overlapped with the standard curve segment.
Optionally, the main contactors include a main positive contactor and a main negative contactor; the curve section comprises a positive curve section and a negative curve section, the positive curve section corresponds to the judgment time of the main positive contactor, and the negative curve section corresponds to the judgment time of the main negative contactor;
the standard curve section comprises a positive standard curve section and a negative standard curve section, the positive standard curve section corresponds to the judgment time of the main positive contactor, and the negative standard curve section corresponds to the judgment time of the main negative contactor.
Optionally, the judging unit is specifically configured to compare the positive curve segment with the positive standard curve segment, and determine whether the main positive contactor is adhered according to whether the positive curve segment is overlapped with the positive standard curve segment; and comparing the negative curve segment with the negative standard curve segment, and determining whether the main and negative contactors are adhered or not according to whether the negative curve segment is overlapped with the negative standard curve segment or not.
In one or more alternative embodiments, the voltage sensor employs a voltage sensor in a battery management system.
The voltage value on the direct current bus is acquired through the voltage sensor in the BATTERY management system (Battery MANAGEMENT SYSTEM, BMS), and the corresponding BATTERY management system is usually configured when the power BATTERY is used, so that the original equipment is utilized, the equipment cost does not need to be increased, and the detection performability is improved.
In one or more alternative embodiments, the apparatus further comprises:
and the display device is used for displaying the discharge curve.
According to the embodiment of the application, the display device can be used for carrying out coincidence comparison on the discharge curve and the standard discharge curve, so that the adhesion identification of the main contactor is more visual.
According to yet another aspect of an embodiment of the present application, there is provided a power battery system, comprising: the power battery and the main contactor adhesion detection device provided by any one of the above embodiments.
According to still another aspect of an embodiment of the present application, there is provided a vehicle including: the main contactor adhesion detection device provided by any one of the above embodiments or the power battery system provided by the above embodiments.
The methods and apparatus of the present application may be implemented in a number of ways. For example, the methods and apparatus of the present application may be implemented by software, hardware, firmware, or any combination of software, hardware, and firmware. The above-described order for the steps of the method is for illustration only, and the steps of the method of the present application are not limited to the order specifically described above unless specifically stated otherwise. Further, in some embodiments, the present application may also be embodied as a program recorded in a recording medium, the program including machine-readable instructions for implementing a method according to the present application. Thus, the present application also covers a recording medium storing a program for executing the method according to the present application.
The description of the present application has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the application in the form disclosed. Many modifications and variations will be apparent to practitioners skilled in this art. The embodiment was chosen and described in order to best explain the principles of the application and the practical application, and to enable others of ordinary skill in the art to understand the application for various embodiments with various modifications as are suited to the particular use contemplated.
Claims (16)
1. A method for detecting adhesion of a main contactor is characterized by comprising the following steps:
acquiring a stable voltage value of direct current buses at two ends of a power battery when the power battery is in a power-on state;
receiving a power-off instruction, and controlling the main contactor to be disconnected according to the power-off instruction to obtain a dropping voltage value after the voltage on the direct current bus is dropped;
obtaining a discharge curve of the power battery based on the drop voltage value and the stable voltage value, wherein the discharge curve represents the change relation of the voltage value on the direct current bus along with time;
comparing the discharge curve with a standard discharge curve to obtain a comparison result, and determining whether the main contactor is adhered or not based on the comparison result;
wherein, the comparing the discharge curve with the standard discharge curve to obtain a comparison result comprises:
comparing a curve segment of the discharge curve corresponding to the duration time of the droop voltage value in the discharge curve with a standard curve segment of the discharge curve corresponding to the duration time in the standard discharge curve, wherein the standard curve segment is represented as a line segment; obtaining a comparison result of whether the curve segment is overlapped with the standard curve segment;
wherein the main contactor comprises a main positive contactor and a main negative contactor; the curve segment comprises a positive curve segment and a negative curve segment, the positive curve segment corresponds to the judgment time of the main positive contactor, and the negative curve segment corresponds to the judgment time of the main negative contactor;
the standard curve section comprises a positive standard curve section and a negative standard curve section, the positive standard curve section corresponds to the judging time of the main positive contactor, and the negative standard curve section corresponds to the judging time of the main negative contactor.
2. The method of claim 1, wherein prior to obtaining the discharge curve of the power cell based on the droop voltage value and the regulated voltage value, further comprising:
and acquiring a standard discharge curve corresponding to the power battery, wherein the standard discharge curve is a normal discharge curve of the main contactor without adhesion, and the standard discharge curve is used for representing the relation between the stable voltage value and the falling voltage value and the time.
3. The method of claim 2, wherein prior to obtaining the discharge curve of the power cell based on the droop voltage value and the regulated voltage value, further comprising:
acquiring the dropping time from a stable voltage value to the dropping voltage value and the duration time of the dropping voltage value in the standard discharge curve;
the obtaining of the discharge curve of the power battery based on the droop voltage value and the steady voltage value comprises:
and obtaining a discharge curve of the power battery based on the drop voltage value, the stable voltage value, the drop time and the duration time, wherein the discharge curve takes time as a horizontal axis and voltage as a vertical axis.
4. The method according to any one of claims 1-3, wherein said determining whether the main contactor is stuck based on the comparison result comprises:
determining that the main contactor is not stuck in response to the comparison result indicating that the discharge curve coincides with the standard discharge curve;
and determining that the main contactor is stuck in response to the comparison result indicating that the discharge curve is not coincident with the standard discharge curve.
5. The method of claim 4, wherein comparing the discharge curve to a standard discharge curve to obtain a comparison result, and determining whether the main contactor is stuck based on the comparison result comprises:
comparing the positive curve segment with the positive standard curve segment, and determining whether the main positive contactor is adhered or not according to whether the positive curve segment is overlapped with the positive standard curve segment or not;
and comparing the negative curve segment with the negative standard curve segment, and determining whether the main contactor and the negative contactor are adhered or not according to whether the negative curve segment is overlapped with the negative standard curve segment or not.
6. The method according to any one of claims 1 to 3, wherein the obtaining of the stable voltage value of the direct current bus at two ends of the power battery when the power battery is in the power-on state comprises:
acquiring a stable voltage value of direct current buses at two ends of the power battery when the power battery is in a power-on state by using a voltage sensor in a battery management system;
the obtaining of the falling voltage value after the voltage on the direct current bus is reduced includes:
and acquiring a dropping voltage value after the voltage on the direct current bus is dropped by using a voltage sensor in the battery management system.
7. The method according to any one of claims 1-3, further comprising:
and displaying the discharge curve through a display device.
8. A main contactor adhesion detection device, characterized by includes:
the voltage sensor is used for acquiring a stable voltage value of a direct current bus at two ends of a power battery when the power battery is in an electrified state, and acquiring a dropping voltage value after voltage on the direct current bus drops;
the controller is used for receiving a power-off command and controlling the main contactor to be disconnected according to the power-off command;
the curve determining unit is used for obtaining a discharge curve of the power battery based on the drop voltage value and the stable voltage value, and the discharge curve represents the change relation of the voltage value on the direct current bus along with time;
the judging unit is used for comparing the discharge curve with a standard discharge curve to obtain a comparison result; determining whether the main contactor is stuck based on the comparison result; when the discharge curve is compared with the standard discharge curve to obtain a comparison result, comparing a curve segment of the discharge curve corresponding to the duration time of the droop voltage value in the discharge curve with a standard curve segment corresponding to the duration time in the standard discharge curve, wherein the standard curve segment is represented as a line segment; obtaining a comparison result of whether the curve segment is overlapped with the standard curve segment;
wherein the main contactor comprises a main positive contactor and a main negative contactor; the curve segment comprises a positive curve segment and a negative curve segment, the positive curve segment corresponds to the judgment time of the main positive contactor, and the negative curve segment corresponds to the judgment time of the main negative contactor; the standard curve section comprises a positive standard curve section and a negative standard curve section, the positive standard curve section corresponds to the judging time of the main positive contactor, and the negative standard curve section corresponds to the judging time of the main negative contactor.
9. The apparatus of claim 8, further comprising:
and the standard curve unit is used for acquiring a standard discharge curve corresponding to the power battery, the standard discharge curve is a normal discharge curve of the main contactor without adhesion, and the standard discharge curve is used for representing the relationship between the stable voltage value and the falling voltage value and the time.
10. The apparatus of claim 9, further comprising:
the time acquisition unit is used for acquiring the dropping time from the stable voltage value to the dropping voltage value in the standard discharge curve and the continuous time of the dropping voltage value;
the curve determining unit is specifically configured to obtain a discharge curve of the power battery based on the droop voltage value, the steady voltage value, the droop time, and the duration, where the discharge curve takes time as a horizontal axis and voltage as a vertical axis.
11. The apparatus according to any of claims 8 to 10, wherein the determining unit, when determining whether the main contactor is stuck based on the comparison result, is specifically configured to determine that the main contactor is not stuck in response to the comparison result indicating that the discharge curve coincides with the standard discharge curve; and determining that the main contactor is stuck in response to the comparison result indicating that the discharge curve is not coincident with the standard discharge curve.
12. The apparatus according to claim 11, wherein the determining unit is specifically configured to compare the positive curve segment with the positive standard curve segment, and determine whether the main positive contactor is stuck according to whether the positive curve segment coincides with the positive standard curve segment; and comparing the negative curve segment with the negative standard curve segment, and determining whether the main contactor and the negative contactor are adhered or not according to whether the negative curve segment is overlapped with the negative standard curve segment or not.
13. The apparatus according to any one of claims 8-10, wherein the voltage sensor is a voltage sensor in a battery management system.
14. The apparatus of any of claims 8-10, further comprising:
and the display device is used for displaying the discharge curve.
15. A power battery system, comprising: a power battery and the main contactor adhesion detection device of any one of the preceding claims 8-14.
16. A vehicle, characterized by comprising: the main contactor adhesion detection device of any one of claims 8-14 or the power battery system of claim 15.
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| CN113500939B (en) * | 2021-07-05 | 2022-12-27 | 华人运通(江苏)技术有限公司 | Method, device and equipment for monitoring state of charging contactor of vehicle |
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| CN107797056B (en) * | 2017-10-31 | 2019-05-31 | 苏州汇川联合动力系统有限公司 | Braking resistor circuit contactor adhesion detection system and method |
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