CN112549964B - Method for monitoring sintering state of contactor, battery manager, vehicle and medium - Google Patents

Method for monitoring sintering state of contactor, battery manager, vehicle and medium Download PDF

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Publication number
CN112549964B
CN112549964B CN201910917108.XA CN201910917108A CN112549964B CN 112549964 B CN112549964 B CN 112549964B CN 201910917108 A CN201910917108 A CN 201910917108A CN 112549964 B CN112549964 B CN 112549964B
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charging
contactor
sintering
power battery
monitoring
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CN112549964A (en
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�田�浩
刘国萍
谭先华
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BYD Co Ltd
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BYD Co Ltd
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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
    • 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
    • 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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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

The invention discloses a method for monitoring the sintering state of a contactor, a battery manager, a vehicle and a medium, wherein the method for monitoring the sintering state of the contactor in a charging loop is used for the battery manager and comprises the following steps: controlling the first main contactor to be disconnected and controlling the second main contactor to be attracted; sending a first charging adjustment instruction to a charging device; judging whether the charging current of the power battery pack is detected; if yes, determining that the first main contactor has a sintering fault; if not, determining that the first main contactor has no sintering fault. The method can realize the monitoring and judgment of the sintering state of the contactor in the charging loop without adding any detection circuit module, and has low cost and small interference.

Description

Method for monitoring sintering state of contactor, battery manager, vehicle and medium
Technical Field
The invention relates to the technical field of vehicles, in particular to a method for monitoring the sintering state of a contactor in a charging loop, a non-temporary computer storage medium, a battery manager and a vehicle.
Background
In an electric vehicle, the on-off state of a high-voltage circuit is controlled by using a contactor. Taking a direct current charging loop as an example, if all contactors from the output end of the power battery pack to the charging connector are closed, a high-voltage terminal in the charging connector will be in a high-voltage electric state, and safety risks exist under a non-charging working condition. Therefore, in the state standard, in the direct current charging mode, the electric automobile should have the functions of monitoring the adhesion of the charging loop contactor (i.e. sintering monitoring) and alarming.
In the related art, in order to realize the sintering monitoring function, a judgment method based on voltage detection is generally adopted to identify whether the contactor sintering exists. For example, one approach discloses: and judging the voltage according to a voltage detection circuit arranged between the direct current charging connector and the direct current charging contactor, judging by combining the actuation control state of the tested contactor, and judging the sintering of the contactor if the voltage exceeding a certain threshold value is detected under the condition that the contactor is not actuated. However, this solution requires a special voltage detection circuit that can communicate with the battery management system to identify the current state of the contactor, which not only increases the cost of the whole vehicle, but also is susceptible to interference in the voltage detection circuit connected to the high-voltage circuit, and may cause a problem of erroneous judgment of sintering.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the embodiment of the first aspect of the invention provides a method for monitoring the sintering state of a contactor in a charging loop, which can realize monitoring and judging of the sintering state of the contactor in the charging loop without adding any detection circuit module, and has low cost and small interference.
Embodiments of the second aspect of the present invention provide a non-transitory computer storage medium.
An embodiment of a third aspect of the present invention provides a battery manager.
An embodiment of a fourth aspect of the present invention is directed to a vehicle.
In order to solve the above problem, a method for monitoring a sintering state of a contactor in a charging circuit according to an embodiment of a first aspect of the present invention is used for a battery manager, the charging circuit is provided with a first main contactor and a second main contactor, and the monitoring method includes: controlling the first main contactor to be disconnected and controlling the second main contactor to be attracted; sending a first charging adjustment instruction to a charging device; judging whether the charging current of the power battery pack is detected; if yes, determining that the first main contactor has a sintering fault; if not, determining that the first main contactor has no sintering fault.
According to the method for monitoring the sintering state of the contactor in the charging loop, the opening and closing states of the contactor in the charging loop are controlled to detect whether the charging current exists in the power battery pack, so that whether the corresponding contactor has a sintering fault or not is determined, the sintering state of the contactor in the charging loop is monitored, and an electric signal of the power battery pack can be monitored through the battery manager of the vehicle.
In some embodiments, the method for monitoring the sintering state of the contactor in the charging circuit further comprises: controlling the second main contactor to be disconnected and controlling the first main contactor to be attracted; sending the first charging adjustment instruction to the charging equipment; judging whether the charging current of the power battery pack is detected; if yes, determining that the second main contactor has a sintering fault; if not, determining that the second main contactor has no sintering fault.
In some embodiments, the power battery packs are N packs, each of the power battery packs including an intra-pack contactor, the monitoring method further comprising: and respectively monitoring the sintering states of the contactors in the N groups of power battery packs.
In some embodiments, the monitoring of the sintering state of the contactors in the N groups of the power battery packs includes: controlling the first main contactor and the second main contactor to be attracted, and controlling the contactors in the X group of power battery packs to be disconnected, wherein X is less than or equal to N; sending a second charging adjustment instruction to the charging equipment; detecting the charging current of the X-th power battery pack; judging whether the charging current of the X-th group power battery pack is larger than a charging current threshold value or not; if yes, determining that sintering faults occur in the contactors in the X-th group of power battery packs; and if not, determining that the sintering fault of the intra-group contactor of the X-th group power battery pack does not occur.
In some embodiments, the monitoring method further comprises: and when the sintering fault of the contactor is determined, performing sintering alarm.
In some embodiments, the monitoring method further comprises: before switching the contactor state, a request to adjust the charging current to zero is sent to the charging device.
A non-transitory computer storage medium according to an embodiment of the second aspect of the present invention has stored thereon a computer program that, when executed, implements the method for monitoring the sintering state of a contactor in a charging circuit according to the above-described embodiment.
An embodiment of the third aspect of the present invention provides a battery manager, including: at least one processor; and a memory communicatively coupled to the at least one processor; the memory stores instructions executable by the at least one processor, which when executed by the at least one processor, cause the at least one processor to perform the method for monitoring the sintering state of the contactor in the charging loop described in the foregoing embodiment.
According to the battery manager provided by the embodiment of the invention, by adopting the method for monitoring the sintering state of the contactor in the charging loop, namely based on the current and voltage detection and control functions of the battery management system on the charging loop, whether the contactor has the sintering fault is judged.
An embodiment of a fourth aspect of the present invention includes: the charging circuit comprises a charging connector, a first main contactor, a second main contactor and a power battery pack, wherein the charging connector is used for being connected with charging equipment; the battery manager according to the above embodiment is connected to the power battery pack and the charging connector, respectively.
According to the vehicle provided by the embodiment of the invention, the battery manager executes the method for monitoring the sintering state of the contactor in the charging loop, so that the monitoring and judgment of the sintering state of the contactor in the charging loop can be directly realized on the premise of not adding any detection circuit module, and the cost is low and the functional reliability is high.
In some embodiments, the power battery packs include N packs, each pack including an intra-pack contactor.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
FIG. 1 is a flow chart of a method of monitoring a contactor's sintered state in a charging circuit according to one embodiment of the invention;
FIG. 2 is a flow chart of a method of monitoring a contactor's sintered state in a charging circuit according to another embodiment of the invention;
FIG. 3 is a flow chart of a specific detection of the sintered state of a contactor in a charging circuit according to one embodiment of the invention;
FIG. 4 is a flow chart of monitoring the sintered state of contactors within a power cell stack according to one embodiment of the present invention;
FIG. 5 is a flowchart of a specific detection of the sintered state of contactors within a power cell stack according to one embodiment of the present invention;
FIG. 6 is a block diagram of a battery manager according to one embodiment of the invention;
FIG. 7 is a block diagram of a vehicle according to one embodiment of the invention;
FIG. 8 is a specific schematic diagram of related systems and modules according to one embodiment of the invention;
reference numerals:
a vehicle 100;
a charging circuit 1; a battery manager 2; a charging device 3; a charging connector 10; a first main contactor 11; a power battery pack 12; a second main contactor 13; at least one processor 20; a memory 21.
Detailed Description
Embodiments of the present invention will be described in detail below, by way of example with reference to the accompanying drawings.
For monitoring the sintering state of the contactor of the charging loop, some schemes adopt a voltage dividing resistor to be connected with the output end of the battery pack and the load end of the contactor, and whether the sintering fault of the contactor exists is confirmed by detecting the lower voltage of the voltage dividing resistor. However, the method needs to add a voltage detection circuit, and the added voltage dividing resistor can increase a communication loop between the positive and negative poles of the direct current high voltage, so that the risk of electric leakage and short circuit between the positive and negative poles of the direct current high voltage is increased.
Or, a detection circuit is formed by adopting a capacitor, an inductor and an alternating current power supply, so that the sintering state of the contactor is detected. The detection circuit can avoid the problem of misjudgment caused by interference in the direct-current voltage detection process, but the method has the defects of complex circuit and higher cost, and also has the risk of causing the increase of the leakage probability between the positive electrode and the negative electrode of the high-voltage direct-current or between the high voltage and the ground wire of the whole vehicle.
Therefore, in the related art, the dc charging contactor is capable of monitoring the sintering state of the contactor only when the contactor is not operating, and if the contactor is monitored at the start or end of charging, the waiting time of the user is prolonged when the user waits for the start or end of charging, which may reduce the satisfaction of the user.
In order to solve the above-mentioned problems, a method for monitoring the sintering state of a contactor in a charging circuit according to an embodiment of the first aspect of the present invention is described below with reference to the accompanying drawings, and the method can directly implement monitoring and judging of the sintering state of a contactor in a charging circuit without adding any detection circuit module.
Fig. 1 is a flowchart of a method for monitoring a sintering state of a contactor in a charging circuit according to an embodiment of the present invention. As shown in FIG. 1, the method for monitoring the sintering state of a contactor in a charging circuit according to the embodiment of the invention at least includes steps S1-S5.
And S1, controlling the first main contactor to be opened and controlling the second main contactor to be closed.
Step S2, a first charging adjustment instruction is sent to the charging equipment.
Step S3, judging whether the charging current of the power battery pack is detected, if so, performing step S4, and if not, performing step S5.
And S4, determining that the first main contactor has sintering faults.
Step S5, determining that the first main contactor does not have sintering fault
The charging circuit is provided with a first main contactor and a second main contactor, specifically, the battery manager controls the first main contactor to be disconnected and the second main contactor to be attracted, after a fixed time length is delayed, a first charging adjustment instruction is sent to the charging equipment to adjust charging parameters, namely, a request for adjusting charging current to target current is sent to the charging equipment, meanwhile, charging voltage is required to be not more than a first voltage threshold value, and further, according to adjustment change of charging current in the charging circuit, the battery manager judges whether charging current exists in the power battery pack. Because under normal state, when first main contactor and second main contactor are in the suction, the charging loop is closed, can carry charging current to power battery, and when first contactor or second contactor are in the disconnection, can not constitute the charging closed loop, can not carry charging current to power battery, therefore, after controlling first main contactor disconnection and second main contactor suction, if there is charging current in the power battery, can confirm that first main contactor takes place the sintering trouble, if there is charging current in the power battery, can confirm that first main contactor does not take place the sintering trouble.
According to the method for monitoring the sintering state of the contactor in the charging loop, the opening and closing states of the contactor in the charging loop are controlled to detect whether the charging current exists in the power battery pack, so that whether the corresponding contactor has a sintering fault or not is determined, the sintering state of the contactor in the charging loop is monitored, and an electric signal of the power battery pack can be monitored through the battery manager of the vehicle.
Further, as shown in fig. 2, the method for monitoring the sintering state of the contactor in the charging circuit according to the embodiment of the invention further includes steps S6 to S10.
And S6, controlling the second main contactor to be opened and controlling the first main contactor to be closed.
Step S7, a first charging adjustment instruction is sent to the charging equipment.
Step S8, judging whether the charging current of the power battery pack is detected, if so, performing step S9, and if not, performing step S10.
And S9, determining that the second main contactor has sintering faults.
Step S10, determining that the second main contactor has not failed in sintering.
Specifically, the battery manager controls the second main contactor to be disconnected and controls the first main contactor to be attracted, delays for a fixed time length, and sends a first charging adjustment instruction to the charging equipment to adjust charging parameters, namely, sends a request for adjusting charging current to target current to the charging equipment, meanwhile, requires that charging voltage is not greater than a first voltage threshold value, further, the battery manager judges whether charging current exists in the power battery pack or not through adjustment change of the charging current in a charging loop, if the charging current exists in the power battery pack, the second main contactor can be determined to have sintering faults, and if the charging current does not exist in the power battery pack, the second main contactor can be determined not to have sintering faults.
In some embodiments, the method for monitoring the sintering state of the contactors in the charging circuit according to the embodiment of the present invention further includes monitoring the sintering state of the contactors in the N groups of power battery packs respectively. The power battery packs are N groups, and each power battery pack comprises a contactor in the group.
In some embodiments, a firing alarm is raised upon determining that a firing failure of the contactor has occurred.
In some embodiments, a request to adjust the charging current to zero is sent to the charging device prior to switching the contactor state.
The following describes a method for monitoring the sintering state of a contactor in a charging circuit according to an embodiment of the present invention according to fig. 3, as shown in fig. 3, the detailed flow is as follows, in which KM a Is a first main contactor KM b Is a second main contactor, U 1 Is the first voltage threshold.
S110: BMS (Battery Management System ) sends charging Current I to charging device e The request to adjust to 0 is executed S111.
S111: judging the charging current I e Whether or not the adjustment has been made to 0, if so, S112 is executed, and if not, S110 is executed.
S112: break KM a KM is kept b Suction, delay t 0 S113 is performed.
S113: emitting a charging current I to a charging device e Adjust to I 1 Is required to be charged at the same time as the charging voltage is required to be not more than U 1 S114 is performed.
S114: at time t 1 In, judging whether the charging current I of the power battery pack is detected c If yes, S115 is executed, and if no, S116 is executed.
S115: confirm to be KM a Sintering failure occurs, and KM is sent out a And (5) sintering and alarming, and executing S116.
S116: BMS sends out charging current I to charging equipment e The request to adjust to 0, S117 is performed.
S117: judging the charging current I e Whether or not the adjustment has been made to 0, if so, S118 is executed, and if not, S116 is executed.
S118: break KM b KM is kept a Suction, send charging current I to the charging equipment e Regulation I 1 An incoming request, at the same time, requires a charging voltage not greater than U 1 S119 is performed.
S119: at time t 1 In, judging whether the charging current I of the power battery pack is detected c If yes, execution is S120, otherwise execution is S121.
S120: confirm to be KM b Sintering failure occurs, and KM is sent out b And (3) sintering and alarming, and executing S121.
S121: and (3) performing sintering detection sub-process on the contactors in the battery packs, namely monitoring the sintering state of the contactors in the N power battery packs.
Specifically, according to the method for monitoring the sintering state of the contactor in the charging loop of the embodiment of the invention, the open-close state of the main contactor in the charging loop is controlled, and a charging current adjusting and regulating instruction is sent to the charging equipment to detect whether the charging current exists in the power battery pack, so as to determine whether the main contactor has a sintering fault, after the main contactor is detected, the sintering state of the contactors in the N groups of power battery packs is monitored, so that the monitoring of the sintering states of all the contactors in the charging loop can be directly realized on the premise of not adding any detection circuit module,
further, the sintering state monitoring of the contactors in the N power battery packs is specifically described according to the drawings, as shown in fig. 4, and at least includes steps S11-S16.
And S11, controlling the first main contactor and the second main contactor to be in attraction, and controlling the contactors in the X-th power battery pack to be disconnected, wherein X is less than or equal to N.
Step S12, a second charging adjustment instruction is sent to the charging device.
Step S13, detecting the charging current of the X-th power battery pack.
Step S14, judging whether the charging current of the X-th power battery pack is larger than a charging current threshold value, if so, performing step S15, and if not, performing step S16.
Step S15, determining that sintering faults occur in the contactors in the X-th power battery pack;
and step S16, determining that the in-group contactor of the X-th group power battery pack has no sintering fault.
Specifically, the battery manager controls the first main contactor and the second main contactor to be engaged, and controls the intra-group contactor of the power battery pack of the X group to be disconnected from X=1, after delaying for a fixed period of time, and sends a second charging adjustment instruction to the charging equipment to adjust charging parameters, namely sending a request for adjusting charging current to a target current to the charging equipment, and meanwhile, requiring that the charging voltage is not greater than a second voltage threshold, and further, in a fixed time, judging whether the charging current of the power battery pack of the X group is greater than the charging current threshold by the battery manager. In a normal state, if the contactor in the X-th power battery pack is disconnected, no current passes through the branch where the power battery is located, and N power batteries in the power battery pack are connected in parallel, so that the total charging current of the power battery pack is increased, and if the charging current of the X-th power battery pack is greater than the charging current threshold value, the contactor in the X-th power battery pack can be determined to have a sintering fault, otherwise, no sintering fault occurs.
The total number of the power battery packs is N, so that the states of contactors in each power battery pack are sequentially detected, and the monitoring of the above embodiment is required N times.
The following illustrates the sintering status monitoring of the contactors in the N-group power battery pack according to the embodiment of the present invention according to fig. 5, as shown in fig. 5, and the detailed flow is as follows, in which U 2 Is the second voltage threshold.
S122: BMS sends out charging current I to charging equipment e The request to adjust to 0 is executed S123.
S123: judging the charging current I e Whether or not the adjustment has been made to 0, if so, S124 is executed, and if not, S122 is executed.
S124: hold KM a 、KM b Actuation, starting from x=1, opens the contactor KM in the power battery of the x-th group x Delay t 0 S125 is performed.
S125: emitting a charging current I to a charging device e Adjust to I 2 Is required to be charged at the same time as the charging voltage is required to be not more than U 2 S126 is performed.
S126: at time t 2 In, judging whether the charging current I of the power battery pack of the x-th group is detected cx Greater than the specified threshold, if yes, S127 is performed, and if no, S128 is performed.
S127: confirm to be KM x Sintering failure occurs, and KM is sent out x And (3) sintering and alarming, and executing S128.
S128: if the total number of battery packs is N, it is determined whether or not x=n is present, and if yes, the process ends, and if not, S129 is executed.
S129: x=x+1, and S122 is performed.
In summary, according to the method for monitoring the sintering state of the contactor in the charging loop of the embodiment of the invention, on the premise that no detection circuit module is additionally arranged, by controlling the opening and closing state of the contactor in the charging loop and sending an adjustment instruction to the charging equipment, the change of the charging current of the power battery pack is detected, so that whether the contactor is in sintering failure or not is determined, that is, on the basis of the existing current and voltage detection and control functions of the BMS and the charging loop, whether the first main contactor and the second main contactor in the charging loop are in sintering failure or not is judged according to whether the charging current of the power battery pack of the X-th group is greater than the charging current threshold value, and whether the contactor in the power battery pack of the X-th group is in sintering failure or not is judged.
An embodiment of the second aspect of the present invention provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed, implements the method for monitoring the sintering state of a contactor in a charging circuit of the above embodiment.
A third aspect of the present invention provides a battery manager, as shown in fig. 6, the battery manager 2 comprising at least one processor 20 and a memory 21.
The memory 21 is communicatively connected to the at least one processor 20, and stores instructions executable by the at least one processor 20, and when the instructions are executed by the at least one processor 20, the at least one processor 20 is caused to perform the method for monitoring the sintering state of the contactor in the charging loop according to the above embodiment.
According to the battery manager provided by the embodiment of the invention, by adopting the monitoring method of the sintering state of the contactor in the charging loop, namely based on the current and voltage detection and control functions of the BMS and the charging loop, whether the contactor has the sintering fault or not is judged.
A third aspect of the present invention provides a vehicle, as shown in fig. 7, the vehicle 100 including a charging circuit 1 and a battery manager 2. The charging circuit 1 comprises a charging connector 10, a first main contactor 11, a second main contactor 13 and a power battery pack 12.
According to the vehicle 100 of the embodiment of the invention, the battery manager 2 of the embodiment executes the method for monitoring the sintering state of the contactor in the charging loop, so that the monitoring and judgment of the sintering state of the contactor in the charging loop can be directly realized without adding any detection circuit module, and the cost is low and the functional reliability is high.
In some embodiments, the power cell stacks 12 include N stacks, each stack 12 including an intra-stack contactor.
Further, the composition and operation of the relevant systems and modules in the vehicle 100 are specifically described with reference to fig. 8.
As shown in fig. 8, specifically, the charging connector 10 includes a vehicle end and a charging device end, which are connected to the charging device 3, for realizing an electrical connection between the high-voltage direct-current loop and the direct-current charging communication network at the time of direct-current charging.
The first main contactor 11 and the second main contactor 13 are located between the charging connector 10 and the power battery pack 12.
The power battery pack 12 comprises N (N is more than or equal to 1) power battery packs 1-N which are connected in parallel in a high-voltage direct-current loop and are mutually independent, and any power battery pack k is provided with a self-built-in contactor KM k And a current sensor k. Wherein the in-group contactor can control the connection or disconnection of the corresponding power battery group k and the high-voltage direct current circuit, and the electricityThe flow sensor may measure the current charged and discharged by the corresponding power battery k.
The battery manager 2 is configured to monitor the voltage status and the current status of each of the battery units in the power battery packs 1 to n in real time, and meanwhile, in the direct current charging process, the battery manager 2 may communicate with the charging device 3 through a direct current charging communication network, propose the required values of the charging current and the charging voltage for the charging device 3, and obtain feedback about whether the charging current and the charging voltage have been adjusted to the required values.
It should be noted that other electric devices of the whole vehicle that obtain the hvdc power supply from the hvdc loop include, but are not limited to, a battery thermal management device that provides cooling or heating for the power battery pack 12, a DC-DC converter that supplies power to the electric circuit of the vehicle 100, and the like.
Specifically, the vehicle 100 is electrically connected with the charging device 3 through the charging connector 10, the battery manager 2 controls the opening and closing states of the first main contactor 11 or the second main contactor 13 or the contactors in the power battery pack 12, meanwhile, the battery manager 2 communicates with the charging device 3 through a direct current charging communication network to send a charging current adjusting instruction to the charging device 3, and further, the battery manager 2 monitors the change of the charging current of the power battery pack in real time to confirm whether the contactors have sintering faults or not, so that the monitoring of the sintering states of all the contactors in the charging loop is realized.
In summary, according to the vehicle 100 of the embodiment of the present invention, the battery manager 2 of the above embodiment executes the method for monitoring the sintering state of the contactor in the charging circuit, and performs the electrical connection between the high-voltage dc circuit and the dc charging communication network through the charging circuit 1 and the charging device 3, based on the current and voltage detection and control functions of the battery manager 2 and the charging circuit 1, the monitoring and the determination of the sintering state of the contactor in the charging circuit can be directly implemented without adding any detection circuit module, and the cost is low and the functional reliability is high.
In the description of this specification, any process or method description in a flowchart or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing logical functions or steps of the process, and in which the scope of the preferred embodiments of the present invention include additional implementations in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present invention.
Logic and/or steps represented in the flowcharts or otherwise described herein, e.g., a ordered listing of executable instructions for implementing logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). In addition, the computer readable medium may even be paper or other suitable medium on which the program is printed, as the program may be electronically captured, via, for instance, optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner, if necessary, and then stored in a computer memory.
It is to be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. As with the other embodiments, if implemented in hardware, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.
Those of ordinary skill in the art will appreciate that all or a portion of the steps carried out in the method of the above-described embodiments may be implemented by a program to instruct related hardware, where the program may be stored in a computer readable storage medium, and where the program, when executed, includes one or a combination of the steps of the method embodiments.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing module, or each unit may exist alone physically, or two or more units may be integrated in one module. The integrated modules may be implemented in hardware or in software functional modules. The integrated modules may also be stored in a computer readable storage medium if implemented in the form of software functional modules and sold or used as a stand-alone product.
The above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, or the like. While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.

Claims (6)

1. The utility model provides a monitoring method of contactor sintering state in charging circuit, characterized by is used for the battery manager, charging circuit is provided with first main contactor and second main contactor, and power battery group is N group, every power battery group includes the intra-group contactor, the monitoring method includes:
controlling the first main contactor to be disconnected and controlling the second main contactor to be attracted;
sending a first charging adjustment instruction to a charging device;
judging whether the charging current of the power battery pack is detected;
if yes, determining that the first main contactor has a sintering fault;
if not, determining that the first main contactor does not have sintering faults;
controlling the second main contactor to be disconnected and controlling the first main contactor to be attracted;
sending the first charging adjustment instruction to the charging equipment;
judging whether the charging current of the power battery pack is detected;
if yes, determining that the second main contactor has a sintering fault;
if not, determining that the second main contactor does not have sintering faults;
the monitoring method further comprises the steps of monitoring the sintering states of the contactors in the N groups of power battery packs respectively:
controlling the first main contactor and the second main contactor to be attracted, and controlling the contactors in the X group of power battery packs to be disconnected, wherein X is less than or equal to N;
sending a second charging adjustment instruction to the charging equipment;
detecting the charging current of the X-th power battery pack;
judging whether the charging current of the X-th group power battery pack is larger than a charging current threshold value or not;
if yes, determining that sintering faults occur in the contactors in the X-th group of power battery packs;
and if not, determining that the sintering fault of the intra-group contactor of the X-th group power battery pack does not occur.
2. The method of monitoring the sintering state of a contactor in a charging circuit according to claim 1, further comprising: and when the sintering fault of the contactor is determined, performing sintering alarm.
3. The method of monitoring the sintering state of a contactor in a charging circuit according to claim 1, further comprising: before switching the contactor state, a request to adjust the charging current to zero is sent to the charging device.
4. A non-transitory computer storage medium, having stored thereon a computer program which, when executed, implements the method of monitoring the sintered state of a contactor in a charging circuit according to any one of claims 1-3.
5. A battery manager, comprising:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein,,
the memory stores instructions executable by the at least one processor, which when executed by the at least one processor, cause the at least one processor to perform the method of monitoring the firing state of a contactor in a charging circuit according to any one of claims 1 to 3.
6. A vehicle, characterized by comprising:
the charging circuit comprises a charging connector, a first main contactor, a second main contactor and a power battery pack, wherein the charging connector is used for being connected with charging equipment;
the battery manager of claim 5, coupled to the power battery pack and the charging connector, respectively.
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