CN112230132B - Device and method for detecting failure of high-voltage relay of battery management system - Google Patents
Device and method for detecting failure of high-voltage relay of battery management system Download PDFInfo
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- CN112230132B CN112230132B CN202010287903.8A CN202010287903A CN112230132B CN 112230132 B CN112230132 B CN 112230132B CN 202010287903 A CN202010287903 A CN 202010287903A CN 112230132 B CN112230132 B CN 112230132B
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- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000001514 detection method Methods 0.000 claims abstract description 37
- 238000003745 diagnosis Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- 230000000295 complement effect Effects 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
- G01R31/3275—Fault detection or status indication
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
- G01R31/3272—Apparatus, systems or circuits therefor
Abstract
The application provides a device and a method for detecting the failure of a high-voltage relay of a battery management system, wherein the device comprises the following components: the high-voltage relay comprises a relay coil; the high-side driving unit is used for performing high-side driving on the relay; a relay control circuit for controlling the relay; the analog signal acquisition circuit is used for acquiring the voltage on the relay coil; and the controller is used for controlling the on-off of the high-side driving unit and the relay control circuit, controlling the analog signal acquisition circuit to acquire the voltage on the relay coil, and judging the failure state of the relay coil according to the voltage. The device and the method for detecting the failure of the high-voltage relay of the battery management system adopt a coil side failure detection mode, and have the advantages of safety, high efficiency, low cost, portability and strong universality.
Description
Technical Field
The application belongs to the field of battery systems, and particularly relates to a device and a method for detecting failure of a high-voltage relay of a battery management system.
Background
Along with the rapid development of new energy automobiles, the power battery is used as a power system of the new energy automobiles, and the safety of a power battery pack directly influences personal safety. To ensure the safety and controllability of the high-voltage loop of the power battery, it is required that the battery management system is able to detect the state of the high-voltage relay in the high-voltage loop.
However, the state detection mode of the high-voltage relay of the conventional battery management system can only judge whether the relay is in a failure state by detecting the contact state of the relay, but can not judge whether the relay is in the failure state by detecting the coil.
Disclosure of Invention
The present application has been made in view of the above-mentioned problems, and an object of the present application is to provide a device and a method for detecting failure of a high-voltage relay in a battery management system, which detect a relay coil, thereby enabling the failure of the relay to be detected quickly and efficiently.
In order to achieve the above object, the present application provides a failure detection device for a high-voltage relay of a battery management system, comprising: a high voltage relay including a relay coil; the high-side driving unit is used for performing high-side driving on the relay; the relay control circuit is used for controlling the relay; the analog signal acquisition circuit is used for acquiring the voltage on the relay coil; and the controller is used for controlling the on-off of the high-side driving unit and the relay control circuit, controlling the analog signal acquisition circuit to acquire the voltage on the relay coil, and judging the failure state of the relay coil according to the voltage.
Further, the relay control circuit includes a controllable switch.
Further, the controllable switch is a triode.
Further, the analog signal acquisition circuit includes a voltage follower.
Further, the relay control circuit comprises a first voltage dividing resistor, the analog signal acquisition circuit comprises a second voltage dividing resistor, the first voltage dividing resistor and the second voltage dividing resistor are connected in series to divide voltage, and the second voltage dividing resistor is connected with the relay in parallel.
Further, when detection is performed, the controller controls the high-side driving unit to prohibit the high-side driving unit from working, and controls the relay control circuit to be switched on and switched off to control the high-voltage relay.
Further, in a state where the high-side driving unit is prohibited from working, the controller controls the analog signal acquisition circuit to acquire voltages on the relay coil when the relay control circuit is turned off and on, respectively, and judges a failure state of the relay coil according to the acquired voltages.
Further, the high-side driving unit comprises a MOS tube.
The application also provides a failure detection method of the high-voltage relay of the battery management system, which uses the failure detection device of the high-voltage relay of the battery management system to detect the failure state of the relay coil, and the method comprises the following steps: controlling the high-side driving unit to prohibit the high-side driving unit from working and controlling the relay control circuit to be disconnected; controlling the analog signal acquisition circuit to acquire the voltage on the relay coil as a first voltage value; controlling the high-side driving unit to prohibit the high-side driving unit from working, and controlling the relay control circuit to be connected; controlling the analog signal acquisition circuit to acquire the voltage on the relay coil as a second voltage value; and judging the failure state of the relay coil according to the first voltage value and the second voltage value.
Further, determining the failure state of the relay coil according to the first voltage value and the second voltage value includes: when the first voltage value is 0 and the second voltage value is a preset voltage value, judging that the relay coil is in an off state; when the first voltage value is larger than 0, judging that the relay coil is in a state of short circuit to a power supply; when the first voltage value and the second voltage value are both 0, judging that the relay coil is in a short circuit state to ground; and when the first voltage value is 0 and the second voltage value is more than 0 and less than a preset voltage value, judging that the relay coil is in a normal state.
Compared with the prior art, the device and the method for detecting the failure of the high-voltage relay of the battery management system detect the failure of the relay rapidly and efficiently by detecting the coil of the relay, and have the advantages of safety, high efficiency, low cost, portability and strong universality.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:
fig. 1 shows a functional schematic diagram of a battery management system high-voltage relay failure detection apparatus according to an exemplary embodiment of the present application.
Fig. 2 shows a flowchart of a battery management system high voltage relay failure detection method according to an exemplary embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the application, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
Fig. 1 shows a functional schematic diagram of a battery management system high-voltage relay failure detection apparatus according to an exemplary embodiment of the present application. The battery management system high-voltage relay failure detection apparatus according to an exemplary embodiment of the present application is described in detail below with reference to fig. 1.
According to an embodiment of the present application, there is provided a battery management system high voltage relay failure detection apparatus including:
a high voltage relay including a relay coil;
the high-side driving unit is used for performing high-side driving on the relay;
The relay control circuit is used for controlling the relay;
the analog signal acquisition circuit is used for acquiring the voltage on the relay coil;
And the controller is used for controlling the on-off of the high-side driving unit and the relay control circuit, controlling the analog signal acquisition circuit to acquire the voltage on the relay coil, and judging the failure state of the relay coil according to the voltage.
The high-voltage relay failure detection device of the battery management system judges the failure state of the relay coil by detecting the voltage on the relay coil, can accelerate the detection of the relay failure, and is more effective in judging the failure of the contact on the premise of judging the failure of the relay coil.
In the battery management system high-voltage relay failure detection device of the present application, the controller U1, the high-side drive unit U2, and the high-voltage relay L1 are connected in a high-side drive manner. Specifically, the high-side driving unit U2 is connected to the side of the relay coil L1 close to the power supply, and thereby high-side drives the relay. High-side drive means that the enabling of the drive means is achieved by closing a switch at the power line directly before the electrical consumer or the drive means. In view of the above, the high-side driving unit U2 is equivalent to adding a controllable switch at the power end of the circuit, and the high-side driving is to control the switch to be turned on or off. In the present application, the high-side driving unit U2 may be implemented using an existing high-side driving chip. In the embodiment shown in fig. 1, the high-side driving unit U2 may include a controllable switch Q1, and the controllable switch Q1 may be, for example, a MOS transistor. The controller U1 is connected with the high-side driving unit U2 so as to control the on-off of the high-side driving unit U2. When the controller U1 controls the high-side driving unit U2 to be switched on, the relay coil L1 is electrified, and the high-voltage relay is in a working state. When the controller U1 controls the high-side driving unit U2 to be disconnected, the relay coil L1 is not electrified, and the high-voltage relay is in a non-working state.
The controller U1 and the high-side driving unit U2 constitute a high-side driving circuit when the high-voltage relay works. The application is additionally provided with a relay control circuit (such as Q2 and R1 in figure 1) and an analog signal acquisition circuit (such as U3, R2 and R3 in figure 1), so that the side voltage of the high-voltage relay coil is acquired, and the failure state (such as open circuit, short circuit to power supply, normal and short circuit to ground) of the relay coil L1 is judged according to the voltage, thereby realizing the failure diagnosis of the relay coil L1.
The failure diagnosis needs to be performed when the high-voltage relay is in a non-operating state. Therefore, at the time of detection, the high-side drive unit needs to be disabled, and the high-voltage relay is controlled by the relay control circuit. In other words, at the time of detection, the controller U1 controls the high-side driving unit U2 to prohibit the operation of the high-side driving unit U2, and controls the on-off of the relay control circuit to control the high-voltage relay. The relay control circuit is connected in parallel with the high-side drive unit U2, i.e. between the power supply VCC and the relay coil L1. The relay control circuit is also connected with the controller U1, so that the on-off of the relay control circuit can be controlled through the controller U1, and the high-voltage relay is further controlled. When the high-voltage relay is controlled by the relay control circuit, if the high-voltage relay is not normally failed, the relay coil L1 is energized when the relay control circuit is on, and the relay coil L1 is not energized when the relay control circuit is off. Therefore, by controlling the on-off of the relay control circuit and detecting the voltage on the relay coil L1 in the corresponding state, the failure state of the relay coil L1 can be judged according to the voltage.
The high-side driving unit U2 is controlled to be disconnected through the controller U1 so as to inhibit the high-side driving unit U2 from working. In a state where the high-side driving unit U2 is disabled, the battery management system high-voltage relay failure detection apparatus of the present application controls the high-voltage relay by controlling the relay control circuit through the controller U1.
In one embodiment, the relay control circuit may include a controllable switch Q2, and the controllable switch Q2 may be, for example, a transistor. The controllable switch Q2 is connected between the power supply VCC and the relay coil L1. The control end of the controllable switch Q2 is connected to the controller U1, so that the on-off of the controllable switch Q2 is controlled through the controller U1, and the high-voltage relay is further controlled.
The input end of the analog signal acquisition circuit is connected with two ends of the relay coil L1, and the output end of the analog signal acquisition circuit is connected with the controller U1 so as to acquire the voltage on the relay coil L1 to the controller U1. In one embodiment, the analog signal acquisition circuit may include a voltage follower U3. The voltage follower U3 may be constituted by an operational amplifier. Optionally, the analog signal acquisition circuit may further include a current limiting resistor R3. At present, some high-end high-side driving chips can integrate an analog signal acquisition circuit, and if the high-side driving chip integrated with the analog signal acquisition circuit is used in the high-side control unit, the analog signal acquisition circuit integrated in the high-side driving chip can be directly adopted to acquire voltage.
In one embodiment, as shown in fig. 1, the relay control circuit may further include a voltage dividing resistor R1, and the analog signal acquisition circuit may further include a voltage dividing resistor R2, where the voltage dividing resistor R1 and the voltage dividing resistor R2 are connected in series and divided, and the voltage dividing resistor R2 is connected in parallel with the relay coil L1. The voltage dividing resistor R1 can realize voltage division and simultaneously can also play a role in current limiting.
The controller U1 may be, for example, an MCU microcontroller. In one embodiment, the DO0 pin of the controller U1 is connected to the control terminal of the high-side driving unit U2 to control the on/off of the high-side driving unit U2. For example, in the embodiment shown in fig. 1, the DO0 pin of the controller U1 is connected to the gate of the MOS transistor Q1, and when the DO0 pin is set to a low level, the MOS transistor Q1 is in an off state, and the high-side driving unit is disabled; when the DO0 pin is set to high, MOS transistor Q1 is in on state and the high side drive unit is enabled. The DO1 pin of the controller U1 is connected to the control end of the relay control circuit to control the on-off of the relay control circuit. For example, in the embodiment shown in FIG. 1, the DO1 pin of controller U1 is connected to the base of transistor Q2. When the DO1 pin of the controller U1 is set to be low level, the triode Q2 is in an off state, and the relay control circuit is switched on; when the DO1 pin of controller U1 is set high, the transistor Q2 is in an on state and the relay control circuit is turned off. The ADC0 pin of the controller U1 is connected to the analog signal acquisition circuit to read the voltage acquired by the analog signal acquisition circuit. For example, in the embodiment shown in fig. 1, the ADC0 pin of the controller U1 is connected to the output terminal of the voltage follower U3, so that the voltage on the relay coil L1 collected by the voltage follower U3 can be read.
The software part of the controller U1 comprises a control module, an analog signal acquisition module and a judgment module. The control module is responsible for controlling the high-side driving unit U2 and the relay control circuit. The analog signal acquisition module is responsible for reading the voltage value generated by the analog signal acquisition circuit. The judging module is responsible for judging the failure state of the relay coil according to the read voltage value.
The operation principle of the high-voltage relay failure detection apparatus of the battery management system of the present application is described below with reference to fig. 1.
Firstly, the controller U1 sets the DO0 and DO1 pins to be at low level, so that the MOS transistor Q1 and the triode Q2 are in an off state, that is, the high-side driving unit U2 and the relay control circuit are both disconnected, thereby ensuring that the relay coil is in an inactive state.
Next, the controller U1 collects the voltage of the ADC0 pin, and performs voltage collection through an analog signal collection circuit (voltage follower U3, current limiting resistor R3, voltage dividing resistor R2), so as to collect the voltage on the relay coil L1, and record as the first voltage value V1.
After that, the controller U1 sets the DO1 pin to a high level and the DO0 pin to a low level, so that the MOS transistor Q1 is in an off state, and the transistor Q2 is in an on state, that is, the high-side driving unit U2 is disabled and the relay control circuit is turned on.
Next, the controller U1 collects the voltage of the ADC0 pin, and performs voltage collection through an analog signal collection circuit (voltage follower U3, current limiting resistor R3, voltage dividing resistor R2), so as to collect the voltage on the relay coil L1, and record as the second voltage value V2.
Then, the controller U1 determines the failure state of the relay coil according to the recorded first voltage value V1 and second voltage value V2.
When both the high-side driving unit U2 and the relay control circuit are in the off state, the relay coil L1 is not energized in the normal state, and therefore the voltage on the relay coil L1 should be 0, and if it is detected that the voltage is greater than 0 (i.e., when the first voltage value V1> 0), it is indicated that the relay coil L1 is in the short-circuited state to the power supply. For example, in the embodiment shown in fig. 1, when v1=v2=vcc×r2/(r1+r2), it may be considered that a short circuit occurs at the MOS transistor Q1, for example, the MOS transistor Q1 may be turned on accidentally; when v1=v2=u3, the relay coil L1 is considered to be short-circuited between the power supply side and the power supply VCC, for example, the high-side driving unit U2 may be turned on accidentally. The U3 operating voltage value refers to a full-scale measurement voltage value of the voltage follower U3. In the present application, the voltage follower U3 and the resistors R1 and R2 may be selected such that vcc×r2/(r1+r2) < U3 operating voltage < VCC. When the relay coil L1 is close to the short circuit between the power supply side and the power supply VCC, the voltage on the relay coil L1 is VCC, but the controller U1 can only read the U3 operating voltage value at this time because the voltage exceeds the full-scale measurement voltage value of the voltage follower U3.
When the high-side drive unit U2 is disabled and the relay control circuit is on, a voltage should be detected on the relay coil L1 normally due to the internal resistance of the relay coil itself, and if the voltage is 0, this indicates that the relay coil is in a short-circuit state to ground. Therefore, if v1=v2=0 is detected, the relay coil L1 can be considered to be in a short-circuit to ground state.
If the relay coil L1 is open, the voltage on the relay coil L1 is 0 when both the high side drive unit U2 and the relay control circuit are open, and the voltage on the relay coil L1 is equal to the voltage division vcc×r2/(r1+r2) on the voltage division resistor R2 when the high side drive unit U2 is open and the relay control circuit is closed. Therefore, if v1=0, v2=vcc×r2/(r1+r2), the relay coil L1 can be considered to be in an off state.
If the relay coil L1 is in a normal state, when both the high-side driving unit U2 and the relay control circuit are turned off, the voltage on the relay coil L1 is 0, and when the high-side driving unit U2 is turned off and the relay control circuit is turned on, assuming that the internal resistance of the relay coil L1 is R4, the resistance R Positive direction =r2×r4/(r2+r4) after the parallel connection of the relay coil L1 and the voltage dividing resistor R2 is calculated according to the parallel resistance formula, and the voltage V2 Positive direction ＝VCC*R Positive direction /(R1+R Positive direction collected by the controller U1) is smaller than the second voltage V2 collected when the relay coil L1 is turned off because R Positive direction < R2, so V2 Positive direction < vcc×r2/(r1+r2). That is, if v1=0, 0< V2< vcc×r2/(r1+r2), the relay coil L1 can be considered to be in a normal state.
In the present application, when the high-side driving unit U2 is turned off and the relay control circuit is turned on in the open state of the relay coil L1, the theoretical voltage on the relay coil L1 is set to a predetermined voltage value V0 (for example, in the embodiment shown in fig. 1, the predetermined voltage value V0 is the voltage division on the voltage dividing resistor R2 in this state, that is, vcc×r2/(r1+r2)), the controller U1 can determine the failure state of the relay coil L1 by the relationship between V1, V2 and the predetermined voltage value V0:
when the first voltage value V1 is 0 and the second voltage value V2 is a predetermined voltage value V0, the controller U1 determines that the relay coil L1 is in an off state;
When the first voltage value V1 is larger than 0, the controller U1 judges that the relay coil L1 is in a short circuit state to the power supply;
when the first voltage value V1 and the second voltage value V2 are both 0, the controller U1 judges that the relay coil L1 is in a short circuit state to ground;
When the first voltage value V1 is 0 and the second voltage value V2 is greater than 0 and less than the predetermined voltage value V0, the controller U1 determines that the relay coil L1 is in a normal state.
A battery management system high-voltage relay failure detection method according to an exemplary embodiment of the present application, which detects a failure state of a relay coil using the above-described battery management system high-voltage relay failure detection apparatus, is described below with reference to fig. 2. Specifically, the method comprises the following steps:
S110: controlling the high-side driving unit to prohibit the high-side driving unit from working and controlling the relay control circuit to be disconnected;
S120: the method comprises the steps of controlling an analog signal acquisition circuit to acquire voltage on a relay coil as a first voltage value V1;
s130: the high-side driving unit is controlled to inhibit the high-side driving unit from working, and the relay control circuit is controlled to be connected;
s140: the analog signal acquisition circuit is controlled to acquire the voltage on the relay coil as a second voltage value V2;
S150: and judging the failure state of the relay coil according to the first voltage value V1 and the second voltage value V2.
In the present application, the above steps may be performed by the controller U1 in the battery management system high-voltage relay failure detection apparatus described above.
Wherein, step S150 further comprises:
S151: when the first voltage value V1 is 0 and the second voltage value V2 is a preset voltage value V0, judging that the relay coil is in an off state;
S152: when the first voltage value V1 is larger than 0, judging that the relay coil is in a state of short circuit to the power supply;
S153: when the first voltage value V1 and the second voltage value V2 are both 0, judging that the relay coil is in a short circuit state to ground;
S154: when the first voltage value V1 is 0 and the second voltage value V2 is greater than 0 and smaller than the preset voltage value V0, the relay coil is judged to be in a normal state.
Wherein, as described above, the predetermined voltage value V0 refers to the theoretical voltage on the relay coil L1 when the high-side driving unit is turned off and the relay control circuit is turned on in the open state of the relay coil L1. For example, in the embodiment shown in fig. 1, the predetermined voltage value V0 is the voltage division across the voltage dividing resistor R2 in this state, that is, vcc×r2/(r1+r2).
The high-voltage relay failure detection device and method of the battery management system adopt a coil side detection relay failure mode (low-voltage detection range), the detection relay failure mode (high-voltage detection range) on the opposite contact side is safer, and the two detection modes are complementary; the coil side detection mode provides a new means for detecting the failure of the relay, the hardware cost of the detection circuit is relatively low, and meanwhile, the portability and the universality are relatively strong, and the detection circuit can be matched with a very common high-side driving chip on the market for detection. In addition, on the premise that the failure of the relay coil is judged by the high-voltage relay failure detection device and the high-voltage relay failure detection method of the battery management system, the contact failure is judged more effectively. Therefore, the device and the method for detecting the failure of the high-voltage relay of the battery management system have the advantages of safety, high efficiency, low cost, portability and strong universality.
In the description of the present application, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present application and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present application; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "upper surface on … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present application.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (8)
1. The method for detecting the failure of the high-voltage relay of the battery management system is characterized in that the failure state of the relay coil is detected by using a failure detection device of the high-voltage relay of the battery management system;
Wherein, battery management system high voltage relay failure detection device includes: a high voltage relay including a relay coil;
the high-side driving unit is used for performing high-side driving on the relay;
The relay control circuit is used for controlling the relay;
the analog signal acquisition circuit is used for acquiring the voltage on the relay coil;
The controller is used for controlling the on-off of the high-side driving unit and the relay control circuit, controlling the analog signal acquisition circuit to acquire the voltage on the relay coil and judging the failure state of the relay coil according to the voltage,
The method comprises the following steps:
the failure state of the relay coil is detected by using a high-voltage relay failure detection device of the battery management system, and the method is characterized in that:
Controlling the high-side driving unit to prohibit the high-side driving unit from working and controlling the relay control circuit to be disconnected;
the method comprises the steps of controlling an analog signal acquisition circuit to acquire voltage on a relay coil as a first voltage value;
the high-side driving unit is controlled to inhibit the high-side driving unit from working, and the relay control circuit is controlled to be connected;
the analog signal acquisition circuit is controlled to acquire the voltage on the relay coil as a second voltage value;
Judging the failure state of the relay coil according to the first voltage value and the second voltage value;
Wherein determining the failure state of the relay coil according to the first voltage value and the second voltage value includes: when the first voltage value is 0 and the second voltage value is a preset voltage value, judging that the relay coil is in an off state;
when the first voltage value is larger than 0, judging that the relay coil is in a state of short circuit to a power supply;
When the first voltage value and the second voltage value are both 0, judging that the relay coil is in a short circuit state to ground;
and when the first voltage value is 0 and the second voltage value is more than 0 and less than a preset voltage value, judging that the relay coil is in a normal state.
2. The method of claim 1, wherein the relay control circuit comprises a controllable switch.
3. The method of claim 2, wherein the controllable switch is a transistor.
4. The method of claim 1, wherein the analog signal acquisition circuit comprises a voltage follower.
5. The method of claim 1, wherein the relay control circuit comprises a first voltage dividing resistor, the analog signal acquisition circuit comprises a second voltage dividing resistor, the first voltage dividing resistor is connected in series with the second voltage dividing resistor to divide the voltage, and the second voltage dividing resistor is connected in parallel with the relay.
6. The method according to any one of claims 1 to 5, wherein the controller controls the high-side driving unit to prohibit operation of the high-side driving unit and controls on-off of the relay control circuit to control the high-voltage relay at the time of detection.
7. The method according to claim 6, wherein the controller controls the analog signal acquisition circuit to acquire voltages on the relay coil when the relay control circuit is turned off and on, respectively, in a state where the high-side driving unit is disabled, and judges a disabled state of the relay coil based on the acquired voltages.
8. The method for detecting failure of a high-voltage relay of a battery management system according to claim 1, wherein the high-side driving unit comprises a MOS transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010287903.8A CN112230132B (en) | 2020-04-14 | 2020-04-14 | Device and method for detecting failure of high-voltage relay of battery management system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010287903.8A CN112230132B (en) | 2020-04-14 | 2020-04-14 | Device and method for detecting failure of high-voltage relay of battery management system |
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| CN112230132A (en) | 2021-01-15 |
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