CN112230132A - High-voltage relay failure detection device and method for battery management system - Google Patents
High-voltage relay failure detection device and method for battery management system Download PDFInfo
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- CN112230132A CN112230132A CN202010287903.8A CN202010287903A CN112230132A CN 112230132 A CN112230132 A CN 112230132A CN 202010287903 A CN202010287903 A CN 202010287903A CN 112230132 A CN112230132 A CN 112230132A
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- 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
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Abstract
The application provides a battery management system high-voltage relay failure detection device and method, and the device comprises: a high voltage relay including a relay coil; the high-side driving unit is used for driving the relay in a high-side mode; a relay control circuit for controlling the relay; the analog signal acquisition circuit is used for acquiring 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 mode of detecting the failure of the relay at the coil side, and have the advantages of safety, high efficiency, low cost, transportability 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
With the rapid development of new energy vehicles, the power battery is used as a power system of the new energy vehicle, and the safety of the power battery pack directly influences the personal safety. In order to ensure the safety and controllability of the high-voltage circuit of the power battery, a battery management system is required to be capable of detecting the state of a high-voltage relay in the high-voltage circuit.
However, the existing battery management system high-voltage relay state detection method can only determine whether the relay is in the failure state by detecting the relay contact state, but cannot determine whether the relay is in the failure state by detecting the coil.
Disclosure of Invention
An object of the present invention is to provide a device and a method for detecting failure of a high-voltage relay in a battery management system, which can detect the failure of the relay quickly and efficiently by detecting the coil of the relay.
In order to achieve the above object, the present application provides a battery management system high voltage relay failure detection apparatus, comprising: a high voltage relay including a relay coil; a high-side driving unit for high-side driving the relay; a relay control circuit for controlling the relay; the analog signal acquisition circuit is used for acquiring 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 comprises a voltage follower.
Further, the relay control circuit includes a first voltage dividing resistor, the analog signal acquisition circuit includes 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 in parallel with the relay.
Further, at the time of detection, the controller controls the high-side driving unit to prohibit the high-side driving unit from operating, and controls on/off of the relay control circuit to control the high-voltage relay.
Further, in a state that the high-side driving unit is prohibited from operating, the controller controls the analog signal acquisition circuit to respectively acquire voltages on the relay coil when the relay control circuit is switched off and on, and determines a failure state of the relay coil according to the acquired voltages.
Further, the high-side driving unit comprises an MOS tube.
The present application further provides a method for detecting failure of a high voltage relay of a battery management system, which uses the above-mentioned device for detecting failure of a high voltage relay of a battery management system to detect a failure state of a relay coil, the method comprising: controlling the high-side driving unit to inhibit the high-side driving unit from operating and controlling the relay control circuit to be switched off; 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 inhibit the high-side driving unit from working and controlling the relay control circuit to be switched on; 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 a disconnected state; when the first voltage value is larger than 0, judging that the relay coil is in a short-circuit state 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 ground short circuit state; and when the first voltage value is 0 and the second voltage value is greater 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 can detect the failure of the relay quickly and efficiently by detecting the coil of the relay, and have the advantages of safety, high efficiency, low cost, transportability and strong universality.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application. In the drawings:
fig. 1 shows a functional schematic of a battery management system high voltage relay failure detection arrangement according to an exemplary embodiment of the present application.
Fig. 2 shows a flow diagram of a battery management system high voltage relay failure detection method according to an example embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. 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. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present 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 example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
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. 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. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. 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.
Fig. 1 shows a functional schematic of a battery management system high voltage relay failure detection arrangement according to an exemplary embodiment of the present application. The battery management system high voltage relay failure detection apparatus of the 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;
a high-side driving unit for high-side driving the relay;
a relay control circuit for controlling the relay;
the analog signal acquisition circuit is used for acquiring 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 battery management system high voltage relay of this application inefficacy detection device judges the failure state of relay coil through the voltage that detects on the relay coil, can accelerate to detect out the relay inefficacy, and under the preceding relay coil of judgement became invalid, go again to judge that the contact is inefficacy can be more effective.
In the battery management system high voltage relay failure detection apparatus of the present application, the controller U1, the high side driving unit U2, and the high voltage relay L1 are connected in a high side driving manner. Specifically, the high-side driving unit U2 is connected to the relay coil L1 on the side closer to the power supply, and drives the relay in a high-side manner. High-side driving means enabling the drive means by closing the switch on the power line directly in front of the consumer or the drive means. In a similar manner, the high-side driving unit U2 is equivalent to a controllable switch added to the power supply terminal of the circuit, and the high-side driving controls the on/off of the switch. In the present application, the high-side driving unit U2 can be implemented by 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 a MOS transistor, for example. The controller U1 is connected to the high side driving unit U2 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 switched off, 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 operates. On the basis, the relay control circuit (such as Q2 and R1 in fig. 1) and the analog signal acquisition circuit (such as U3, R2 and R3 in fig. 1) are additionally arranged, so that the voltage on the coil side of the high-voltage relay is acquired, and the failure state (such as open circuit, short circuit to a power supply, normal short circuit to the ground) of the relay coil L1 is judged according to the voltage, so that the failure diagnosis of the relay coil L1 is realized.
The failure diagnosis needs to be performed when the high-voltage relay is in a non-operating state. Therefore, when performing the detection, it is necessary to disable the high-side driving unit and control the high-voltage relay by the relay control circuit. In other words, at the time of detection, the controller U1 controls the high-side driving unit U2 to disable 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 controlled. When the high-voltage relay is controlled by the relay control circuit, if the high-voltage relay is not normally disabled, the relay coil L1 is energized when the relay control circuit is turned on, and the relay coil L1 is not energized when the relay control circuit is turned off. Therefore, by controlling the on/off of the relay control circuit and detecting the voltage across the relay coil L1 in the corresponding state, the failure state of the relay coil L1 can be determined from the voltage.
The high side drive unit U2 is controlled to be turned off by the controller U1 to disable the high side drive unit U2 from operating. 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 triode. A 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 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 that the voltage on the relay coil L1 is acquired to the controller U1. In one embodiment, the analog signal acquisition circuit may include a voltage follower U3. The voltage follower U3 may be formed of 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 control unit uses the high-side driving chip integrated with the analog signal acquisition circuit, the voltage can be acquired by directly adopting the analog signal acquisition circuit integrated in the high-side driving chip.
In one embodiment, as shown in fig. 1, the relay control circuit may further include a voltage dividing resistor R1, the analog signal acquisition circuit may further include a voltage dividing resistor R2, the voltage dividing resistor R1 is connected in series with the voltage dividing resistor R2 for dividing voltage, and the voltage dividing resistor R2 is connected in parallel with the relay coil L1. The divider resistor R1 can also function as a current limiter while realizing voltage division.
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 drive unit U2 to control the on/off of the high side drive 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 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, the MOS transistor Q1 is in a conducting state, and the high side driver is enabled. And a DO1 pin of the controller U1 is connected to a control end of the relay control circuit so as to control the on-off of the relay control circuit. For example, in the embodiment shown in fig. 1, the DO1 pin of the controller U1 is connected to the base of a transistor Q2. When a DO1 pin of the controller U1 is set to be at a low level, the triode Q2 is in an off state, and the relay control circuit is switched on; when the DO1 pin of the controller U1 is set to a high level, the transistor Q2 is in a conducting state and the relay control circuit is turned off. An 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 drive 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. And the judging module is responsible for judging the failure state of the relay coil according to the read voltage value.
The operation of the battery management system high voltage relay failure detection apparatus of the present application is described below with reference to fig. 1.
Firstly, the controller U1 sets the DO0 and DO1 pins to 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 turned off, thereby ensuring that the relay coil is in an off state.
Next, the controller U1 collects the voltage of the ADC0 pin, and the voltage is collected by the analog signal collecting circuit (the voltage follower U3, the current limiting resistor R3, and the voltage dividing resistor R2), so as to collect the voltage on the relay coil L1, and record the voltage as the first voltage value V1.
Then, the controller U1 sets the DO1 pin to high level and the DO0 pin to low level, so that the MOS transistor Q1 is in off state and the triode Q2 is in 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 the voltage is collected by the analog signal collecting circuit (the voltage follower U3, the current limiting resistor R3, and the voltage dividing resistor R2), so as to collect the voltage on the relay coil L1, and record the voltage as the second voltage value V2.
Thereafter, the controller U1 judges the failure state of the relay coil based on the recorded first voltage value V1 and second voltage value V2.
When the high-side driving unit U2 and the relay control circuit are both in the off state, in the normal state, the relay coil L1 is not energized, and therefore the voltage of L1 on the relay coil 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 indicates that the relay coil L1 is in a 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 MOS transistor Q1, for example, MOS transistor Q1 may be accidentally turned on; when V1 is equal to V2 is equal to U3, it is considered that the relay coil L1 is short-circuited between the power supply side and the power supply VCC, for example, the high-side driving unit U2 may be accidentally turned on. The operating voltage value of the U3 refers to the 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 value < 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 voltage exceeds the full-scale measurement voltage value of the voltage follower U3, and the controller U1 can only read the U3 working voltage value at this time.
When the high-side driving unit U2 is disabled and the relay control circuit is turned on, normally, due to the internal resistance of the relay coil itself, a voltage should be detected at the relay coil L1, and if the voltage is 0, it 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 across the relay coil L1 is 0 when both the high side drive unit U2 and the relay control circuit are off, and the voltage across the relay coil L1 is equal to the divided voltage VCC R2/(R1+ R2) across the voltage dividing resistor R2 when the high side drive unit U2 is off and the relay control circuit is on. Therefore, if V1 is 0 and V2 is VCC R2/(R1+ R2), the relay coil L1 can be considered to be in the off state.
If the relay coil L1 is in a normal state, when the high-side driving unit U2 and the relay control circuit are both turned off, the voltage across 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 after the relay coil L1 is connected in parallel with the voltage dividing resistance R2 is estimated according to the parallel resistance formulaIs justR2 × R4/(R2+ R4), voltage V2 collected by controller U1Is just＝VCC*RIs just/(R1+RIs just) Due to RIs just<R2, so V2Is just<VCC ar 2/(R1+ R2), therefore, the second voltage value V2 collected in the normal state of the relay coil L1 is smaller than the second voltage value V2 collected when the relay coil L1 is turned off. That is, if V1 is 0, 0<V2<VCC ar 2/(R1+ R2), the relay coil L1 is considered to be in a normal state.
In the present application, when the relay coil L1 is in an open state, the theoretical voltage across the relay coil L1 when the high-side driving unit U2 is turned off and the relay control circuit is turned on is set to the predetermined voltage value V0 (for example, in the embodiment shown in fig. 1, the predetermined voltage value V0 is the voltage division across the voltage division resistor R2 in this state, i.e., VCC R2/(R1+ R2)), the controller U1 may determine the failure state of the relay coil L1 by the relationship among V1, V2 and the predetermined voltage value V0:
when the first voltage value V1 is 0 and the second voltage value V2 is the predetermined voltage value V0, the controller U1 determines that the relay coil L1 is in the off state;
when the first voltage value V1 is greater than 0, the controller U1 determines that the relay coil L1 is in a short-circuit state with respect to the power supply;
when the first voltage value V1 and the second voltage value V2 are both 0, the controller U1 determines 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 inhibit the high-side driving unit from working and controlling the relay control circuit to be switched off;
s120: controlling an analog signal acquisition circuit to acquire voltage on a relay coil as a first voltage value V1;
s130: controlling the high-side driving unit to forbid the high-side driving unit from working and controlling a relay control circuit to be switched on;
s140: controlling the analog signal acquisition circuit 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 includes:
s151: when the first voltage value V1 is 0 and the second voltage value V2 is the predetermined voltage value V0, determining that the relay coil is in an off state;
s152: when the first voltage value V1 is greater than 0, judging that the relay coil is in a short-circuit state with respect 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 ground short-circuit state;
s154: 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, it is determined that the relay coil is in the normal state.
As described above, the predetermined voltage value V0 is a theoretical voltage applied to 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 divided by the voltage dividing resistor R2 in this state, i.e., VCC R2/(R1+ R2).
According to the device and the method for detecting the failure of the high-voltage relay of the battery management system, a coil side detection relay failure mode (low-voltage detection range) is adopted, the opposite contact side detection relay failure mode (high-voltage detection range) is safer, and the two detection modes belong to complementation; the coil side detection mode provides a new means for detecting the failure of the relay, and the detection circuit has the advantages of low hardware cost, strong portability and universality and capability of being matched with a high-side driving chip which is very universal in the market for detection. In addition, on the premise that the failure of the relay coil is judged through the device and the method for detecting the failure of the high-voltage relay of the battery management system, the contact failure judgment is more effective. 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, transportability and strong universality.
In the description of the present application, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the case of not making a reverse description, these directional terms do not indicate and imply that the device or element being referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore, should not be considered as limiting the scope of the present application; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship 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 of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of protection of the present application is not to be construed as being limited.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. A battery management system high voltage relay failure detection device, comprising:
a high voltage relay including a relay coil;
a high-side driving unit for high-side driving the relay;
a relay control circuit for controlling the relay;
the analog signal acquisition circuit is used for acquiring 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.
2. The battery management system high voltage relay failure detection device of claim 1, wherein the relay control circuit comprises a controllable switch.
3. The battery management system high voltage relay failure detection device of claim 2, wherein the controllable switch is a triode.
4. The battery management system high voltage relay failure detection device of claim 1, wherein the analog signal acquisition circuit comprises a voltage follower.
5. The battery management system high voltage relay failure detection device of claim 1, wherein the relay control circuit comprises a first voltage dividing resistor, and the analog signal acquisition circuit comprises a second voltage dividing resistor, wherein the first voltage dividing resistor and the second voltage dividing resistor are connected in series to divide voltage, and the second voltage dividing resistor and the relay are connected in parallel.
6. The battery management system high voltage relay failure detection apparatus of any of claims 1-5, wherein upon detection, the controller controls the high side drive unit to disable the high side drive unit and controls the relay control circuit to be on and off to control the high voltage relay.
7. The battery management system high voltage relay failure detection device of claim 6, wherein in a state where the high side driving unit is disabled, 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 determines a failure state of the relay coil according to the acquired voltages.
8. The battery management system high voltage relay failure detection device of claim 1, wherein the high side drive unit comprises a MOS transistor.
9. A battery management system high voltage relay failure detection method that detects a failure state of a relay coil using the battery management system high voltage relay failure detection apparatus of any one of claims 1 to 8, the method comprising:
controlling the high-side driving unit to inhibit the high-side driving unit from operating and controlling the relay control circuit to be switched off;
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 inhibit the high-side driving unit from working and controlling the relay control circuit to be switched on;
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.
10. The battery management system high voltage relay failure detection method of claim 9, wherein determining the failure state of the relay coil from the first voltage value and the second voltage value comprises:
when the first voltage value is 0 and the second voltage value is a preset voltage value, judging that the relay coil is in a disconnected state;
when the first voltage value is larger than 0, judging that the relay coil is in a short-circuit state 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 ground short circuit state;
and when the first voltage value is 0 and the second voltage value is greater than 0 and less than a preset voltage value, judging that the relay coil is in a normal state.
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 |
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| CN112230132B (en) | 2024-04-19 |
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