CN113589162A - Adhesion detection circuit and detection method for electric vehicle charging relay - Google Patents
Adhesion detection circuit and detection method for electric vehicle charging relay Download PDFInfo
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- CN113589162A CN113589162A CN202110986298.8A CN202110986298A CN113589162A CN 113589162 A CN113589162 A CN 113589162A CN 202110986298 A CN202110986298 A CN 202110986298A CN 113589162 A CN113589162 A CN 113589162A
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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
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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
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
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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
- G01R31/3274—Details related to measuring, e.g. sensing, displaying or computing; Measuring of variables related to the contact pieces, e.g. wear, position or resistance
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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
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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
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
Abstract
The invention relates to an adhesion detection circuit and a detection method for an electric vehicle charging relay. The detection circuit includes: the high-voltage electric control integrated unit comprises a direct-current converter and a charging relay, the high-voltage electric control integrated unit is electrically connected with the battery pack through a high-voltage wire harness, and the direct-current converter is used for detecting voltages at two ends of the charging relay; the battery pack comprises a battery management system, the direct current converter is connected with the battery management system through a bus, and the battery management system is used for controlling the state of the charging relay and reporting the state of the charging relay and the battery voltage of the battery pack to the bus; the direct current converter is also used for receiving the state of the charging relay and the voltage of the battery from the bus, and when the state is an off state and the voltage is equal to the voltage of the battery, the charging relay is judged to be stuck. The invention has the advantage of low cost.
Description
Technical Field
The invention mainly relates to the technical field of electronic circuits, in particular to an adhesion detection circuit and an adhesion detection method for an electric vehicle charging relay.
Background
Direct current quick charging is a main charging mode of an electric automobile, voltage and current are large in a direct current quick charging loop, and a quick charging relay is usually used for controlling the on-off of a circuit. When a large current passes through the relay, the control circuit can forcibly disconnect the contact of the quick charge relay for the protection circuit, but the adhesion of the quick charge relay can be caused due to electric arcs or sparks. Under the condition that the adhesion takes place at the relay that fills soon, in the twinkling of an eye that the car starts, fill soon the relay and be in the adhesion state, can make during heavy current directly flows into the battery package, produce the impact to electron device, still lead to the unable normal use of charge strategy when causing the damage risk, cause unable the charging.
At present, the quick charge relays produced by most manufacturers are arranged in the battery pack, on one hand, the battery pack needs to be provided with an independent quick charge interface, and the cost is increased; on the other hand, if the quick charge relay is damaged, the battery pack needs to be disassembled for replacement or maintenance, and for some electric automobiles, the battery pack can be opened only by raising the electric automobiles, so that the cost is high and the convenience is high. In addition, the adhesion detection method of the relay commonly used at present adopts the relay with the auxiliary contact for detection, so that the cost is high, meanwhile, a battery management system is required for detection, hardware pins of the battery management system are required to be occupied, and the cost is further increased.
Disclosure of Invention
The invention aims to provide a low-cost adhesion detection circuit and a low-cost adhesion detection method for an electric vehicle charging relay.
The invention provides an adhesion detection circuit of an electric automobile charging relay, which comprises: the high-voltage electric control integrated unit comprises a direct-current converter and a charging relay, the high-voltage electric control integrated unit is electrically connected with the battery pack through a high-voltage wire harness, and the direct-current converter is used for detecting voltages at two ends of the charging relay; the battery pack comprises a battery management system, the direct current converter is connected with the battery management system through a bus, and the battery management system is used for controlling the state of the charging relay and reporting the state of the charging relay and the battery voltage of the battery pack to the bus, wherein the state comprises one of a connection state and a disconnection state; the direct current converter is further used for receiving the state of the charging relay and the battery voltage from the bus, and judging that the charging relay is stuck when the state is an off state and the voltage is equal to the battery voltage.
In an embodiment of the invention, the charging system further comprises a charging pile, the charging relay is electrically connected with the charging pile through a high-voltage wire harness, and the battery management system is connected with the charging pile through the bus.
In an embodiment of the present invention, the high-voltage electronic control integrated unit further includes a high-voltage distribution box, and the charging relay is located in the high-voltage distribution box.
In an embodiment of the invention, the charging relay comprises a quick charging relay.
The invention also provides an adhesion detection method for the charging relay of the electric automobile, which aims to solve the technical problems and comprises the following steps: receiving the state of a charging relay and the battery voltage reported by a battery management system, wherein the state comprises one of a connection state and a disconnection state; detecting the voltage at two ends of the charging relay; and when the state is an off state and the voltage is equal to the battery voltage, judging that the charging relay is stuck.
In an embodiment of the present invention, the step of detecting the voltage across the charging relay includes: and detecting the voltage at two ends of the charging relay by adopting a direct current converter, wherein the direct current converter is positioned in the high-voltage electric control integrated unit.
In an embodiment of the present invention, the high-voltage electronic control integrated unit further includes a high-voltage distribution box, and the charging relay is located in the high-voltage distribution box.
In an embodiment of the invention, the battery management system is located in a battery pack.
In an embodiment of the present invention, the method further includes: when the charging relay is judged to be adhered, the direct current converter sends the judgment result to the battery management system, the battery management system sends the judgment result to the charging pile, and the battery management system does not send a charging request to the charging pile.
In an embodiment of the present invention, the method further includes: and displaying the judgment result on the charging pile.
The invention simultaneously arranges the DC converter and the charging relay in a high-voltage electric control integrated unit of the electric automobile, detects the voltage at two ends of the charging relay by using the DC converter, enables the DC converter and a battery management system in a battery pack to communicate through a bus, can receive the on-state or off-state of the charging relay and the actual battery voltage of the battery pack, and judges the adhesion state of the charging relay according to the state of the charging relay and the battery voltage. According to the adhesion detection circuit and the adhesion detection method, the inherent elements and the wiring harness of the electric automobile can be utilized, additional elements and wiring harnesses are not required to be added, and the adhesion detection circuit and the adhesion detection method have the advantage of low cost. In addition, the charging relay is arranged in the high-voltage distribution box, so that later-stage inspection and maintenance are facilitated.
Drawings
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below, wherein:
fig. 1 is a circuit block diagram of an adhesion detection circuit of an electric vehicle charging relay according to an embodiment of the present invention;
fig. 2 is a schematic flowchart of an adhesion detection method for an electric vehicle charging relay according to an embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described herein, and thus the present invention is not limited to the specific embodiments disclosed below.
As used in this application and the appended claims, the terms "a," "an," "the," and/or "the" are not intended to be inclusive in the singular, but rather are intended to be inclusive in the plural unless the context clearly dictates otherwise. In general, the terms "comprises" and "comprising" merely indicate that steps and elements are included which are explicitly identified, that the steps and elements do not form an exclusive list, and that a method or apparatus may include other steps or elements.
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.
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.
Flow charts are used herein to illustrate operations performed by systems according to embodiments of the present application. It should be understood that the preceding or following operations are not necessarily performed in the exact order in which they are performed. Rather, various steps may be processed in reverse order or simultaneously. Meanwhile, other operations are added to or removed from these processes.
Fig. 1 is a circuit block diagram of an adhesion detection circuit of an electric vehicle charging relay according to an embodiment of the present invention. As shown in fig. 1, the adhesion detection circuit of the electric vehicle charging relay according to the embodiment of the present invention includes: a high voltage electronic control integrated unit 10 and a battery pack 20. The high-voltage electronic control integrated unit 10 includes a dc converter 11 and a charging relay 12, and the high-voltage electronic control integrated unit 10 is electrically connected to the battery pack 20 through a high-voltage wiring harness L1. The battery pack 20 includes a battery management system 21, and the dc converter 11 and the battery management system 21 are connected by a bus L2.
Referring to FIG. 1, the high voltage line L1 includes at least one positive line DC + and one negative line DC-. Bus L2 may be a CAN bus.
The dc converter 11 is an inverter that converts a dc power supply voltage into any dc voltage, and can provide power required by a power steering system, an air conditioner, and other auxiliary devices, and also can regulate the power supply output and stabilize the bus voltage. The charging relay 12 is a switch of the charging circuit, and its state includes one of an on state and an off state. When charging is needed, the control element controls the charging relay 12 to be switched on, and when the charging loop is communicated; when the charging is stopped, the control element controls the charging relay 12 to be turned off, and the charging circuit is turned off. In the sticking detection circuit of the present invention, the dc converter 11 is used to detect the voltage across the charging relay 12.
In some embodiments, the charging relay 12 comprises a quick charge relay, and is a quick charge relay without auxiliary contacts. In other embodiments, the charging relay 12 may include a slow charging relay or the like.
In the embodiment of the present invention, the battery management system 21 is employed as a control element for controlling the charging relay 12, and the charging relay 12 can be controlled to be turned on or off. The battery management system 21 is also configured to report the state of the charging relay 12 and the battery voltage of the battery pack 20 to the bus L2.
In the sticking detection circuit of the present invention, the dc converter 11 is also used to receive the state of the charging relay 12 and the battery voltage from the bus L2. When the state of the charging relay 12 is the off state and the voltage across the charging relay 12 is equal to the battery voltage, it is judged that the charging relay 12 is stuck.
In this embodiment, there is no limitation on how the battery management system 21 controls the state of the charge relay 12. In some embodiments, the battery management system 21 may obtain the state that the charging relay 12 should have through the charging post 30 connected to the battery pack 20.
It is understood that when the state of the charging relay 12 is the off state, it indicates that the charging relay 12 is not charging, and if the voltage across the charging relay 12 is detected to be equal to the battery voltage, it indicates that the charging relay 12 is stuck, and corresponding measures should be taken.
In an embodiment of the present invention, the high voltage electronic control integrated unit 10 further includes a high voltage distribution box 13, and the charging relay 12 is located in the high voltage distribution box 13. The high-voltage distribution box 13 is a high-voltage power distribution unit and is used for electrically connecting high-voltage components through busbars and wiring harnesses, providing functions of charge and discharge control, high-voltage component electrifying control, circuit overload short-circuit protection, high-voltage sampling, low-voltage control and the like for a high-voltage system of an electric automobile, and protecting and monitoring the operation of the high-voltage system.
The charging relay 12 is arranged inside the high-voltage electronic control integrated unit 10, and when the electric automobile is charged, the high-voltage electric automobile is directly and quickly charged to the high-voltage distribution box 13 instead of the battery pack 21 through the high-voltage wire harness. The original high-voltage wiring harness is arranged between the high-voltage distribution box 12 and the charging pile 30, and the high-voltage wiring harness is utilized, so that the high-voltage wiring harness does not need to be additionally added, and the cost is saved. In addition, the charging relay 12 is disposed in the high voltage distribution box 13, and the high voltage distribution box 12 is typically disposed in a front cover of the electric vehicle, and the high voltage distribution box 12 can be seen by opening the front cover, so that the later replacement and maintenance are convenient.
Referring to fig. 1, in an embodiment of the present invention, the adhesion detection circuit further includes a charging pile 30, the charging relay 12 is connected to the charging pile 30 through a high voltage harness L1, and the battery management system 21 is connected to the charging pile 30 through a bus L3. Among them, the high voltage harness L1 is the high voltage harness L1 between the high voltage electronic control integrated unit 10 and the battery pack 20, and the bus L3 may be a CAN bus.
The working process of the adhesion detection circuit of the electric automobile charging relay is as follows: the charging operator (generally, a vehicle owner) locks the vehicle, inserts a charging gun into the charging pile 30, the charging pile 30 performs voltage detection, when a preset voltage (for example, 6V) is detected, it indicates that the charging pile 30 is connected with the vehicle-mounted high-voltage electronic control integrated unit 10, the charging pile 30 wakes up the battery management system 21 in the battery pack 20, the battery management system 21 performs communication handshake with the charging pile 30 through a bus L3, if the preset voltage is compatible with the vehicle-mounted high-voltage electronic control integrated unit 10, the charging pile 30 informs the battery management system 21 of the values of voltage and current required to be input by the battery management system 21, the battery management system 21 performs self-detection after obtaining the values, if the charging condition of the charging pile 30 can be met, the charging pile 30 is informed to perform charging, the charging pile 30 starts to supply power, and the battery management system 21 controls the charging relay 12 to be switched on to start charging. The battery management system 21 determines whether to finish charging according to the battery state of the battery pack 21, and if the current battery capacity reaches the target set by the user, the battery management system 21 informs the charging pile 30 to stop supplying power through the bus L3, and the battery management system 21 controls the charging relay 12 to be turned off, so that charging stops.
In the self-test process of the battery management system 21, if the self-test is passed, the battery management system 21 simultaneously wakes up the dc converter 11 through the bus L2, after the dc converter 11 is woken up, the voltage across the charging relay 12 is detected, and the state of the charging relay 12 and the battery voltage reported by the battery management system 21 are received from the bus L2, and when the state of the charging relay 12 is an off state and the voltage across the charging relay 12 is equal to the battery voltage, it is determined that the charging relay 12 is stuck. Otherwise, it is determined that the charging relay 12 is not adhered.
According to the adhesion detection circuit of the charging relay of the electric automobile, the direct current converter 11 and the charging relay 12 are arranged in the high-voltage electronic control integrated unit 10, and the adhesion state of the charging relay 12 is detected by detecting the voltage at two ends of the charging relay 12 through the direct current converter 11 and receiving the state of the charging relay 12 and the voltage of a battery from a bus. The adhesion detection circuit is changed on the basis of the inherent elements of the electric automobile, adhesion detection of the charging relay can be achieved by modifying a communication protocol and a control program, extra detection elements and wiring harnesses are not required to be added, and the adhesion detection circuit has the advantage of low cost. In addition, the invention uses the direct current converter 11 to detect the voltage at the two ends of the charging relay 12, and does not need to occupy the port of the battery management system 21, thereby further saving the hardware cost.
In an embodiment of the present invention, the high-voltage electronic control integrated unit 10 may further include a vehicle-mounted charger, where the vehicle-mounted charger is an electric energy conversion device fixedly installed on the electric vehicle for controlling and adjusting charging of the storage battery. In this embodiment, the high-voltage electronic control integrated unit 10 includes a vehicle-mounted charger, a dc converter 11 and a high-voltage distribution box 13, forming a vehicle-mounted three-in-one high-voltage electronic control integrated unit 10.
Fig. 2 is an exemplary flowchart of a method for detecting adhesion of a charging relay of an electric vehicle according to an embodiment of the present invention. The adhesion detection method may be performed using an adhesion detection circuit as shown in fig. 1, and thus the foregoing description of the adhesion detection circuit may be used to describe the adhesion detection method of the present invention. As shown in fig. 2, the adhesion detection method of this embodiment includes the steps of:
step S210: and receiving the state of the charging relay and the battery voltage reported by the battery management system, wherein the state comprises one of a connection state and a disconnection state.
Step S220: the voltage across the charging relay is detected.
Step S230: and when the state is an off state and the voltage is equal to the battery voltage, judging that the charging relay is stuck.
In step S210, the battery management system may be the battery management system 21 shown in fig. 1. In this step, the battery management system may obtain the state of the charging relay and the battery voltage, and send information such as the state of the charging relay and the battery voltage to the bus through a message, so that other devices may receive the state of the charging relay and the battery voltage from the bus. With reference to the embodiment shown in fig. 1, the battery management system 21 is connected to the dc converter 11 through the bus L2, and the dc converter 11 receives the message reported by the battery management system 21 from the bus L2, and obtains the state of the charging relay and the battery voltage after analyzing the message.
In step S220, the sticking detection method does not limit what circuit is employed to detect the voltage across the charging relay. In some embodiments, step S220 includes: and detecting the voltage at two ends of the charging relay by adopting a direct current converter, wherein the direct current converter is positioned in the high-voltage electric control integrated unit. This step may be performed using the dc converter 11 shown in fig. 1.
The method comprises the following steps that a direct current converter is adopted to detect voltages at two ends of a charging relay, the two conditions can be divided into two conditions, one condition is that charging is carried out after a key is turned off, when a charging gun is inserted and charging is started, a charging pile can awaken a battery management system, the battery management system carries out self-checking, if the self-checking result is that no fault exists, the battery management system sends an awakening message to the direct current converter through a bus, and the voltages at two ends of a quick charging relay are detected after the direct current converter is awakened.
The other condition is that the key is used for charging, because the vehicle is not powered off, the battery management system and the direct current converter are both in working states, and the direct current converter directly detects the voltage at two ends of the charging relay.
In an embodiment of the present invention, the high-voltage electronic control integrated unit further includes a high-voltage distribution box, and the charging relay is located in the high-voltage distribution box.
In an embodiment of the present invention, the battery management system is located in the battery pack.
In step S230, the dc converter already obtains the state of the charging relay and the battery voltage reported by the battery management system, and the dc converter itself also detects the voltages at the two ends of the charging relay, and when the state of the charging relay is an off state and the voltages at the two ends of the charging relay are equal to the battery voltage, it is determined that the charging relay is stuck.
In an embodiment of the present invention, the adhesion detection method further includes: when judging that charging relay takes place the adhesion, direct current converter sends the judged result for battery management system, and battery management system sends the judged result to filling electric pile to battery management system does not send the request of charging to filling electric pile.
Combine the adhesion detection circuitry shown in fig. 1, when judging that charging relay takes place the adhesion, direct current converter 11 can send charging relay 12's adhesion state for battery management system 21 through bus L2, battery management system 21 with fill and be connected through bus L3 between the electric pile 30, battery management system 21 sends the adhesion state to filling electric pile 30 through bus L3, battery management system 30 control charging relay 12 disconnection, battery management system 21 no longer sends the request of charging to filling electric pile 30 simultaneously, fill electric pile 30 and stop the power supply, when having guaranteed that charging relay 11 takes place the adhesion, no longer charge battery package 20, the security of charging has been improved.
In an embodiment of the present invention, the adhesion detection method further includes: and displaying a judgment result in the charging pile. For the charging pile with the display device, for example, the charging pile with the display screen, the judgment result can be displayed on the display screen. As shown in fig. 1, the battery management system 21 sends the adhesion state to the charging pile 30 through the bus L3, and the charging pile 30 displays the adhesion state on the display screen, so as to remind the user of the adhesion state of the charging relay 12 and prompt the measures to be taken.
According to the adhesion detection method, the adhesion state of the charging relay can be conveniently and rapidly detected, and the cost is low.
Having thus described the basic concept, it will be apparent to those skilled in the art that the foregoing disclosure is by way of example only, and is not intended to limit the present application. Various modifications, improvements and adaptations to the present application may occur to those skilled in the art, although not explicitly described herein. Such modifications, improvements and adaptations are proposed in the present application and thus fall within the spirit and scope of the exemplary embodiments of the present application.
Also, this application uses specific language to describe embodiments of the application. Reference throughout this specification to "one embodiment," "an embodiment," and/or "some embodiments" means that a particular feature, structure, or characteristic described in connection with at least one embodiment of the present application is included in at least one embodiment of the present application. Therefore, it is emphasized and should be appreciated that two or more references to "an embodiment" or "one embodiment" or "an alternative embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, some features, structures, or characteristics of one or more embodiments of the present application may be combined as appropriate.
Numerals describing the number of components, attributes, etc. are used in some embodiments, it being understood that such numerals used in the description of the embodiments are modified in some instances by the use of the modifier "about", "approximately" or "substantially". Unless otherwise indicated, "about", "approximately" or "substantially" indicates that the number allows a variation of ± 20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximations that may vary depending upon the desired properties of the individual embodiments. In some embodiments, the numerical parameter should take into account the specified significant digits and employ a general digit preserving approach. Notwithstanding that the numerical ranges and parameters setting forth the broad scope of the range are approximations, in the specific examples, such numerical values are set forth as precisely as possible within the scope of the application.
Claims (10)
1. The utility model provides an electric automobile charging relay's adhesion detection circuitry which characterized in that includes: a high-voltage electric control integrated unit and a battery pack, wherein,
the high-voltage electric control integrated unit comprises a direct current converter and a charging relay, the high-voltage electric control integrated unit is electrically connected with the battery pack through a high-voltage wire harness, and the direct current converter is used for detecting voltages at two ends of the charging relay; and
the battery pack comprises a battery management system, the direct current converter is connected with the battery management system through a bus, and the battery management system is used for controlling the state of the charging relay and reporting the state of the charging relay and the battery voltage of the battery pack to the bus, wherein the state comprises one of a connection state and a disconnection state;
the direct current converter is further used for receiving the state of the charging relay and the battery voltage from the bus, and judging that the charging relay is stuck when the state is an off state and the voltage is equal to the battery voltage.
2. The adhesion detection circuit of claim 1, further comprising a charging post, wherein the charging relay is electrically connected to the charging post via a high voltage wire harness, and wherein the battery management system is connected to the charging post via the bus.
3. The adhesion detection circuit of claim 1, wherein the high voltage electrical control integrated unit further comprises a high voltage distribution box, and the charging relay is located in the high voltage distribution box.
4. The adhesion detection circuit of claim 1, wherein the charging relay comprises a quick charge relay.
5. An adhesion detection method for an electric vehicle charging relay is characterized by comprising the following steps:
receiving the state of a charging relay and the battery voltage reported by a battery management system, wherein the state comprises one of a connection state and a disconnection state;
detecting the voltage at two ends of the charging relay; and
and when the state is an off state and the voltage is equal to the battery voltage, judging that the charging relay is stuck.
6. The adhesion detection method according to claim 5, wherein the step of detecting the voltage across the charge relay includes: and detecting the voltage at two ends of the charging relay by adopting a direct current converter, wherein the direct current converter is positioned in the high-voltage electric control integrated unit.
7. The adhesion detection method according to claim 6, wherein the high-voltage electronic control integrated unit further comprises a high-voltage distribution box, and the charging relay is located in the high-voltage distribution box.
8. The adhesion detection method of claim 6, wherein the battery management system is located in a battery pack.
9. The adhesion detection method of claim 8, further comprising: when the charging relay is judged to be adhered, the direct current converter sends the judgment result to the battery management system, the battery management system sends the judgment result to the charging pile, and the battery management system does not send a charging request to the charging pile.
10. The adhesion detection method of claim 9, further comprising: and displaying the judgment result on the charging pile.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110986298.8A CN113589162A (en) | 2021-08-26 | 2021-08-26 | Adhesion detection circuit and detection method for electric vehicle charging relay |
| CN202211032654.3A CN115327367A (en) | 2021-08-26 | 2022-08-26 | Adhesion detection circuit and detection method for electric vehicle charging relay |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110986298.8A CN113589162A (en) | 2021-08-26 | 2021-08-26 | Adhesion detection circuit and detection method for electric vehicle charging relay |
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| Publication Number | Publication Date |
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| CN113589162A true CN113589162A (en) | 2021-11-02 |
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| CN202110986298.8A Pending CN113589162A (en) | 2021-08-26 | 2021-08-26 | Adhesion detection circuit and detection method for electric vehicle charging relay |
| CN202211032654.3A Pending CN115327367A (en) | 2021-08-26 | 2022-08-26 | Adhesion detection circuit and detection method for electric vehicle charging relay |
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| CN202211032654.3A Pending CN115327367A (en) | 2021-08-26 | 2022-08-26 | Adhesion detection circuit and detection method for electric vehicle charging relay |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114435135A (en) * | 2021-12-14 | 2022-05-06 | 广东美的白色家电技术创新中心有限公司 | Relay state determining method and device, electronic equipment and storage medium |
| CN116298833A (en) * | 2022-09-06 | 2023-06-23 | 肇庆小鹏汽车有限公司 | Relay adhesion detection method and system, storage medium and new energy automobile |
-
2021
- 2021-08-26 CN CN202110986298.8A patent/CN113589162A/en active Pending
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2022
- 2022-08-26 CN CN202211032654.3A patent/CN115327367A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114435135A (en) * | 2021-12-14 | 2022-05-06 | 广东美的白色家电技术创新中心有限公司 | Relay state determining method and device, electronic equipment and storage medium |
| CN114435135B (en) * | 2021-12-14 | 2024-01-05 | 广东美的白色家电技术创新中心有限公司 | Relay state determining method and device, electronic equipment and storage medium |
| CN116298833A (en) * | 2022-09-06 | 2023-06-23 | 肇庆小鹏汽车有限公司 | Relay adhesion detection method and system, storage medium and new energy automobile |
| CN116298833B (en) * | 2022-09-06 | 2024-03-08 | 肇庆小鹏汽车有限公司 | Relay adhesion detection method and system, storage medium and new energy automobile |
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| CN115327367A (en) | 2022-11-11 |
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