CN113156307A - Battery system high-voltage relay adhesion fault detection circuit and method - Google Patents
Battery system high-voltage relay adhesion fault detection circuit and method Download PDFInfo
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- CN113156307A CN113156307A CN202110386402.XA CN202110386402A CN113156307A CN 113156307 A CN113156307 A CN 113156307A CN 202110386402 A CN202110386402 A CN 202110386402A CN 113156307 A CN113156307 A CN 113156307A
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Abstract
The invention relates to the technical field of new energy electric automobile power batteries, and discloses a battery system high-voltage relay adhesion fault detection circuit and a method, wherein detection current is output through a DC/DC power module U1, the output level state of a phototriode in an optocoupler U2 is determined according to the on-off state of a high-voltage relay KM1, the on-off state of the high-voltage relay KM1 is fed back to a controller (BMS or VCU or MCU) in real time, and the controller can judge whether the adhesion fault occurs to the high-voltage relay KM1 through comparison; the contact adhesion condition of the corresponding high-voltage relay can be detected one to one, the anti-interference capability is strong, the circuit structure is simple, the cost is low, the reliability is high, meanwhile, the circuit can be copied and applied to adhesion fault detection of the multi-output relay in a multi-path mode, and the practical value is high.
Description
Technical Field
The invention relates to the technical field of new energy electric automobile power batteries, in particular to a circuit and a method for detecting adhesion faults of a high-voltage relay of a battery system.
Background
At present, in order to guarantee the driving safety of an electric automobile, a complete set of control scheme and protection logic are provided for a battery system of the whole automobile, and a Battery Management System (BMS) plays a key role based on the electrochemical characteristics of the battery, protects the driving of the battery for the normal operation of the battery, and prevents the battery from safety accidents such as overcharge and overdischarge.
The principle of the BMS for protecting the battery is realized by cutting off a fault circuit through a high-voltage relay, and generally, a high-voltage system of an electric vehicle mainly includes a discharge circuit, a pre-charge circuit, a slow charge circuit, a fast charge circuit, and a DC/DC circuit, and some vehicle models include a power steering circuit, a power brake circuit, an air conditioner circuit, a heating circuit, and the like, as shown in fig. 1. Each high-voltage loop is connected with a high-voltage relay in series, the power of the battery system provides energy to a rear end load through the high-voltage relays, or a charging device infuses energy to the battery system through the high-voltage relays, the BMS collects analog quantity parameters such as the voltage and the temperature of the battery and various state information in operation in real time, the high-voltage relays of the corresponding loops are controlled and cut off in time under the condition that the battery is about to deviate from a normal working range, the energy exchange in the corresponding loops is interrupted, the combustion accident of the battery due to the out-of-control electrochemical characteristics is prevented, and the purposes of improving the safety performance of a vehicle and prolonging the service life of the battery are finally achieved.
The high-voltage relay usually works in the application environment of high voltage and heavy current, and also needs to bear the reverse electromotive force impact brought by the load of a rear-stage motor frequently, and once the severe use scene exceeds the maximum breaking capacity and the maximum switching voltage, the adhesion fault can occur to the moving contact of the high-voltage relay, namely the separation can not be controlled. In addition, the phenomena of metal contact abrasion, arc discharge, ablation and the like caused by the increase of the breaking times and the aging of materials can also cause the high-voltage relay to generate adhesion faults. If the high voltage relay is stuck, the control of the BMS may fail, and there is no mention about vehicle safety and battery life.
Aiming at the serious harm possibly brought by the adhesion fault of the high-voltage relay, a plurality of researchers in China make a great deal of attempts on a method for detecting and finding the adhesion fault of the relay, a plurality of design schemes are proposed, and the following four schemes are mainly summarized: firstly, whether the battery pack is in an adhesion fault or not is judged by detecting and comparing the voltage conditions of the total positive and total negative points of the battery pack and the total positive and total negative points of the load before and after the high-voltage relay is opened and closed, for example, the methods disclosed in patents CN104090229A and CN 109849733A; secondly, whether the adhesion fault occurs is judged by connecting shunt sampling resistors in parallel in each high-voltage loop, calculating, processing and comparing voltage sampling values at two ends of the shunt resistors before and after the high-voltage relay is opened and closed, for example, the methods described in patent CN105527567A, patent CN106546915A and patent CN 207689636U; thirdly, by adopting a signal injection method and a signal coupling technology, a low-frequency alternating current small signal or a high-frequency pulse signal is injected between the dynamic contacts of the high-voltage relay, and then a rear-end signal conditioning circuit is utilized to detect and process response signals at two ends of the dynamic contacts, so as to judge whether the high-voltage relay has adhesion faults or not, for example, the methods described in patents CN107340471A, CN209311636U and CN 111650506A; fourthly, selecting a high-voltage relay with an auxiliary contact, detecting the state of the auxiliary contact through a signal processing circuit at the rear end, and directly judging whether the high-voltage relay has an adhesion fault or not, such as the method disclosed in patent CN 209417236U.
The scheme is that the method widely adopted by the control part of the battery system at present has an electrical structure shown in figure 2, and judges whether the adhesion fault occurs by detecting and comparing the voltage conditions between the total positive and total negative points of the battery pack and the total positive and total negative points of the load before and after the high-voltage relays are opened and closed, for example, whether the adhesion fault occurs in the main positive relay can be judged by combining the voltage U21 between a detection point 2 and a detection point 1 and the voltage U31 between a detection point 3 and a detection point 1, whether the adhesion fault occurs in the main negative relay can be judged by combining the voltage U21 between the detection point 2 and the detection point 1 and the voltage U26 between the detection point 2 and the detection point 6, so that whether the adhesion fault occurs in all the relays can be known by analogy, but the method needs a multi-path high-voltage isolation detection circuit for support, the more relays need to be detected, the higher the cost is, the more complex the circuit is, and the market competitiveness of the product is greatly reduced; the second scheme is that the shunt sampling resistors are connected in parallel in each high-voltage loop, and the voltage sampling values at two ends of the shunt resistor before and after the high-voltage relay is switched on and off are calculated, processed and compared to judge whether the high-voltage relay is in adhesion fault or not, but the shunt sampling resistors are artificially connected in parallel in the high-voltage loop of the battery in the method, so that the leakage of the battery system can be caused, the insulation fault can be caused, and the energy loss of the battery can be caused; according to the third scheme, a signal injection method and a signal coupling technology are adopted, a low-frequency alternating current small signal or a high-frequency pulse signal is injected between the movable contacts of the high-voltage relay, a rear-end signal conditioning circuit is used for detecting and processing response signals at two ends of the movable contacts, and then whether the high-voltage relay has an adhesion fault is judged; according to the fourth scheme, the high-voltage relay with the auxiliary contact is selected, the state of the auxiliary contact is detected through the signal processing circuit at the rear end, and whether the high-voltage relay is in adhesion fault or not is directly judged.
Disclosure of Invention
The invention mainly aims to provide a simple, low-cost and high-reliability battery system high-voltage relay adhesion fault detection circuit and method to solve the defects of the high-voltage relay adhesion fault detection method.
In order to achieve the above object, the invention provides a circuit for detecting adhesion fault of a high-voltage relay of a battery system, comprising: the detection circuit comprises a DC/DC power supply module U1, an optocoupler U2, a current limiting resistor R1, a current limiting resistor R2, a reverse flow diode D1 and a high-voltage relay KM1, wherein the DC/DC power supply module U1 is used for providing an isolated and independent power supply for the detection circuit, the input end of the DC/DC power supply module U1 is electrically connected with a controller (BMS or VCU or MCU), the current limiting resistor R1 and the current limiting resistor R2 are used for limiting the current value on the detection circuit, the current limiting resistor R1 and the current limiting resistor R2 are respectively electrically connected with the output end of the DC/DC power supply module U1, the other end of the current limiting resistor R2 is electrically connected with the high-voltage relay KM1, the optocoupler U2 comprises a detection light emitting diode and a phototriode, one end of the detection light emitting diode is electrically connected with the current limiting resistor R1, and the reverse flow diode D1 is used for blocking the current and voltage in the high-voltage circuit from flowing to the detection circuit, the other end of the detection light emitting diode is electrically connected with one end of the reverse flow diode D1, the other end of the reverse flow diode D1 is electrically connected with the high-voltage relay KM1, and the phototriode is connected to a signal output circuit and is grounded with a signal processing circuit of a controller (BMS or VCU or MCU).
Further, the pull-up circuit further comprises a pull-up resistor R3, two ends of the pull-up resistor R3 are electrically connected with the phototriode and the signal output circuit respectively, and the pull-up resistor R3 is used for signal level conversion.
Further, the output voltage of the DC/DC power module U1 is 12Vdc, or 5Vdc, or 3.3 Vdc.
Further, the invention also provides a method for detecting the adhesion fault of the high-voltage relay of the battery system, which is carried out by adopting the circuit and comprises the following steps:
after the controller (BMS or VCU or MCU) is powered on, the DC/DC power supply module U1 outputs detection current;
if the high-voltage relay KM1 is in an off state, a detection loop is open, no current passes through a detection light-emitting diode in the optocoupler U2, a phototriode in the optocoupler U2 is in an off state, and due to the pull-up action of the resistor R3, a signal output circuit outputs a high level to a controller (BMS or VCU or MCU);
if the high-voltage relay KM1 is in a closed state, the detection loop is conducted, the current of a detection light-emitting diode in the optocoupler U2 passes, the phototriode in the optocoupler U2 is in a closed state and is short-circuited to the ground, and the signal output circuit outputs low level to a controller (BMS or VCU or MCU);
the controller (BMS or VCU or MCU) continuously acquires the on-off state of the high-voltage relay KM1 in real time, and the controller combines a control instruction issued to the high-voltage relay KM1 to obtain a conclusion whether the high-voltage relay KM1 has adhesion fault or not through comparison.
Further, the controller (BMS or VCU or MCU) continuously acquires the on-off state of the high-voltage relay KM1 in real time, and in combination with a control command issued by the controller itself to the high-voltage relay KM1, the conclusion of whether the high-voltage relay KM1 has the adhesion fault can be easily obtained through comparison, including: if the on-off control instruction sent by the controller (BMS or VCU or MCU) is not accordant with the on-off state fed back by the high-voltage relay KM1 in real time, an adhesion fault is generated.
Further, the controller (BMS or VCU or MCU) continuously acquires the on-off state of the high-voltage relay KM1 in real time, and in combination with a control command issued by the controller itself to the high-voltage relay KM1, the conclusion of whether the high-voltage relay KM1 has the adhesion fault can be easily obtained through comparison, including: if the on-off control instruction sent by the controller (BMS or VCU or MCU) is consistent with the on-off state fed back by the high-voltage relay KM1 in real time, no adhesion fault is generated.
By adopting the technical scheme of the invention, the invention has the following beneficial effects: according to the technical scheme, the detection current is output through the DC/DC power supply module U1, the detection current flows through the high-voltage relay KM1 to be detected after passing through the current-limiting resistor R1, the current-limiting resistor R2, the detection light-emitting diode and the reverse flow diode D1 in the optocoupler U2, the output level state of the phototriode in the optocoupler U2 is determined according to the on-off state of the high-voltage relay KM1, the on-off state of the high-voltage relay KM1 is fed back to the controller (BMS or VCU or MCU) in real time, the controller (BMS or VCU or MCU) combines a control instruction sent to the high-voltage relay KM1 by the controller, and whether the adhesion fault occurs in the high-voltage relay KM1 can be judged through comparison. Compared with the prior art, the invention has the advantages that the detection circuit can independently work at the high-voltage part of the battery system, can be placed in the BMS, can also be placed in a Vehicle Control Unit (VCU) or a Motor Controller (MCU), is electrically isolated from the controller (BMS or VCU or MCU), and is not interfered; the contact adhesion condition of the corresponding high-voltage relay can be detected one to one, the anti-interference capability is strong, the insulating electric leakage problem cannot be caused, the circuit has the advantages of simple structure, low cost and high reliability, and meanwhile, the circuit can be applied to adhesion fault detection of the multi-output relay in a multi-path copying manner, and has great practical value.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a network topology diagram of an electric vehicle;
FIG. 2 is a schematic diagram of an electrical structure of a relay adhesion failure detection method widely used in the present stage;
fig. 3 is a schematic diagram of a battery system high-voltage relay adhesion fault detection circuit according to the present invention;
fig. 4 is a flowchart of a method for detecting an adhesion fault of a high-voltage relay of a battery system according to the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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 invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The invention provides a battery system high-voltage relay adhesion fault detection circuit.
As shown in fig. 3 and 4, in an embodiment of the present invention, the circuit for detecting the sticking fault of the high voltage relay in the battery system includes: the detection circuit comprises a DC/DC power supply module U1, an optocoupler U2, a current limiting resistor R1, a current limiting resistor R2, a reverse current diode D1 and a high-voltage relay KM1, wherein the DC/DC power supply module U1 is used for providing an isolated and independent power supply for the detection circuit, the input end of the DC/DC power supply module U1 is electrically connected with a controller (BMS or VCU or MCU), the current limiting resistor R1 and the current limiting resistor R2 are used for limiting the current value on the detection loop and reducing power consumption and preventing the current from being overlarge to damage semiconductor devices such as diodes, but the resistance value of the current limiting resistor R1 and the current limiting resistor R2 also needs to ensure that the loop current reaches the normal working current of the detection light-emitting diode in the U2, the current limiting resistor R1 and the current limiting resistor R2 are respectively electrically connected with the output end of the DC/DC power supply module U1, the other end of the current limiting resistor R2 is electrically connected with the high-voltage relay KM1, and the optocoupler U2 belongs to an optical coupling isolation device, the opto-coupler U2 is including detecting emitting diode and phototriode, detect emitting diode's one end with current-limiting resistor R1 electricity is connected, backward flow diode D1 is arranged in blocking the electric current in the high-voltage loop and the adhesion of voltage flow direction detects the return circuit, prevents that the low pressure device from being broken down by high-pressure heavy current, detect emitting diode's the other end with backward flow diode D1's one end is connected, backward flow diode D1's the other end with high-voltage relay KM1 electricity is connected, the phototriode is received signal output circuit to with controller (BMS or VCU or MCU) signal processing circuit ground altogether.
Specifically, the pull-up circuit further comprises a pull-up resistor R3, two ends of the pull-up resistor R3 are electrically connected with the phototriode and the signal output circuit respectively, and the pull-up resistor R3 is used for signal level conversion.
Specifically, the output voltage of the DC/DC power module U1 is 12Vdc, or 5Vdc, or 3.3Vdc, and the power selection is 0.25W, the DC/DC power module U1 is configured to provide an isolated and independent power supply for the detection circuit, the left power supply part is from the controller (BMS or VCU or MCU), and the right power supply part is an isolated output.
The invention also provides a method for detecting the adhesion fault of the high-voltage relay of the battery system, which is carried out by adopting the circuit and comprises the following steps as shown in figure 4:
s100: after the controller (BMS or VCU or MCU) is powered on, the DC/DC power supply module U1 outputs detection current;
s200: if the high-voltage relay KM1 is in an off state, a detection loop is open, no current passes through a detection light-emitting diode in the optocoupler U2, a phototriode in the optocoupler U2 is in an off state, and due to the pull-up action of the resistor R3, a signal output circuit outputs a high level to a controller (BMS or VCU or MCU);
s300: if the high-voltage relay KM1 is in a closed state, the detection loop is conducted, the current of a detection light-emitting diode in the optocoupler U2 passes, the phototriode in the optocoupler U2 is in a closed state and is short-circuited to the ground, and the signal output circuit outputs low level to a controller (BMS or VCU or MCU);
s400: the controller (BMS or VCU or MCU) continuously acquires the on-off state of the high-voltage relay KM1 in real time, and the controller combines a control instruction issued to the high-voltage relay KM1 to obtain a conclusion whether the high-voltage relay KM1 has adhesion fault or not through comparison.
Specifically, the controller (BMS or VCU or MCU) in S400 continuously acquires the on-off state of the high-voltage relay KM1 in real time, and in combination with a control command issued by the controller itself to the high-voltage relay KM1, the conclusion of whether the high-voltage relay KM1 has the adhesion fault can be easily obtained through comparison, including: if the on-off control instruction sent by the controller (BMS or VCU or MCU) is not accordant with the on-off state fed back by the high-voltage relay KM1 in real time, an adhesion fault is generated.
Specifically, the controller (BMS or VCU or MCU) in S400 continuously acquires the on-off state of the high-voltage relay KM1 in real time, and in combination with a control command issued by the controller itself to the high-voltage relay KM1, the conclusion of whether the high-voltage relay KM1 has the adhesion fault can be easily obtained through comparison, including: if the on-off control instruction sent by the controller (BMS or VCU or MCU) is consistent with the on-off state fed back by the high-voltage relay KM1 in real time, no adhesion fault is generated.
Specifically, according to the technical scheme, the detection current is output through the DC/DC power module U1, the detection current flows through the high-voltage relay KM1 to be detected after passing through the current-limiting resistor R1, the current-limiting resistor R2, the detection light-emitting diode in the optocoupler U2 and the reflux diode D1, the output level state of the phototriode in the optocoupler U2 is determined according to the on-off state of the high-voltage relay KM1, the on-off state of the high-voltage relay KM1 is fed back to the controller (BMS or VCU or MCU) in real time, the controller (BMS or VCU or MCU) combines the control instruction issued to the high-voltage relay KM1 by the controller, and whether the adhesion fault occurs in the high-voltage relay KM1 can be judged through comparison. Compared with the prior art, the invention has the advantages that the detection circuit can independently work at the high-voltage part of the battery system through the magnetic coupling isolation device and the optical coupling isolation device, can also be placed in the BMS, can also be placed in a Vehicle Control Unit (VCU) or a Motor Controller (MCU), is electrically isolated from the controller (BMS or VCU or MCU), and is not interfered; the contact adhesion condition of the corresponding high-voltage relay can be detected one to one, the anti-interference capability is strong, the insulating electric leakage problem cannot be caused, the circuit has the advantages of simple structure, low cost and high reliability, and meanwhile, the circuit can be applied to adhesion fault detection of the multi-output relay in a multi-path copying manner, and has great practical value.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (6)
1. A battery system high voltage relay adhesion fault detection circuit characterized in that includes: the detection circuit comprises a DC/DC power supply module U1, an optocoupler U2, a current limiting resistor R1, a current limiting resistor R2, a reverse flow diode D1 and a high-voltage relay KM1, wherein the DC/DC power supply module U1 is used for providing an isolated and independent power supply for the detection circuit, the input end of the DC/DC power supply module U1 is electrically connected with a controller (BMS or VCU or MCU), the current limiting resistor R1 and the current limiting resistor R2 are used for limiting the current value on the detection circuit, the current limiting resistor R1 and the current limiting resistor R2 are respectively electrically connected with the output end of the DC/DC power supply module U1, the other end of the current limiting resistor R2 is electrically connected with the high-voltage relay KM1, the optocoupler U2 comprises a detection light emitting diode and a phototriode, one end of the detection light emitting diode is electrically connected with the current limiting resistor R1, and the reverse flow diode D1 is used for blocking the current and voltage in the high-voltage circuit from flowing to the adhesion detection circuit, the other end of the detection light emitting diode is electrically connected with one end of the reverse flow diode D1, the other end of the reverse flow diode D1 is electrically connected with the high-voltage relay KM1, and the phototriode is connected to a signal output circuit and is grounded with a signal processing circuit of a controller (BMS or VCU or MCU).
2. The battery system high-voltage relay sticking fault detection circuit according to claim 1, further comprising a pull-up resistor R3, wherein two ends of the pull-up resistor R3 are electrically connected with the phototriode and the signal output circuit respectively, and the pull-up resistor R3 is used for signal level conversion.
3. The battery system high-voltage relay sticking fault detection circuit according to claim 1, wherein the output voltage of the DC/DC power module U1 is 12Vdc, or 5Vdc, or 3.3 Vdc.
4. A method for detecting the adhesion fault of a high-voltage relay of a battery system is characterized by being carried out by adopting the circuit of any one of claims 1-3, and comprises the following steps:
after the controller (BMS or VCU or MCU) is powered on, the DC/DC power supply module U1 outputs detection current;
if the high-voltage relay KM1 is in an off state, a detection loop is open, no current passes through a detection light-emitting diode in the optocoupler U2, a phototriode in the optocoupler U2 is in an off state, and due to the pull-up action of the resistor R3, a signal output circuit outputs a high level to a controller (BMS or VCU or MCU);
if the high-voltage relay KM1 is in a closed state, the detection loop is conducted, the current of a detection light-emitting diode in the optocoupler U2 passes, the phototriode in the optocoupler U2 is in a closed state and is short-circuited to the ground, and the signal output circuit outputs low level to a controller (BMS or VCU or MCU);
the controller (BMS or VCU or MCU) continuously acquires the on-off state of the high-voltage relay KM1 in real time, and the controller combines a control instruction issued to the high-voltage relay KM1 to obtain a conclusion whether the high-voltage relay KM1 has adhesion fault or not through comparison.
5. The method for detecting the adhesion fault of the high-voltage relay of the battery system according to claim 4, wherein the controller (BMS, VCU or MCU) continuously collects the on-off state of the high-voltage relay KM1 in real time, and in combination with a control command issued by the controller itself to the high-voltage relay KM1, the conclusion that whether the adhesion fault occurs in the high-voltage relay KM1 can be easily obtained through comparison, which comprises the following steps: if the on-off control instruction sent by the controller (BMS or VCU or MCU) is not accordant with the on-off state fed back by the high-voltage relay KM1 in real time, an adhesion fault is generated.
6. The method for detecting the adhesion fault of the high-voltage relay of the battery system according to claim 4, wherein the controller (BMS, VCU or MCU) continuously collects the on-off state of the high-voltage relay KM1 in real time, and in combination with a control command issued by the controller itself to the high-voltage relay KM1, the conclusion that whether the adhesion fault occurs in the high-voltage relay KM1 can be easily obtained through comparison, which comprises the following steps: if the on-off control instruction sent by the controller (BMS or VCU or MCU) is consistent with the on-off state fed back by the high-voltage relay KM1 in real time, no adhesion fault is generated.
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| CN202110386402.XA CN113156307A (en) | 2021-04-09 | 2021-04-09 | Battery system high-voltage relay adhesion fault detection circuit and method |
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| CN202110386402.XA CN113156307A (en) | 2021-04-09 | 2021-04-09 | Battery system high-voltage relay adhesion fault detection circuit and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113777483A (en) * | 2021-09-26 | 2021-12-10 | 珠海格力电器股份有限公司 | Relay detection circuit, detection system, power distribution unit and vehicle |
| CN115877200A (en) * | 2023-02-21 | 2023-03-31 | 中电装备山东电子有限公司 | Broken wire detection system |
-
2021
- 2021-04-09 CN CN202110386402.XA patent/CN113156307A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113777483A (en) * | 2021-09-26 | 2021-12-10 | 珠海格力电器股份有限公司 | Relay detection circuit, detection system, power distribution unit and vehicle |
| CN115877200A (en) * | 2023-02-21 | 2023-03-31 | 中电装备山东电子有限公司 | Broken wire detection system |
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