Fault diagnosis method and device for multi-pile charging and vehicle

Abstract

The invention discloses a multi-pile charging fault diagnosis method and device and a vehicle. The multi-pile charging fault diagnosis method comprises the steps that system information of a power battery, state information of the whole vehicle and charging information of at least two charging piles are obtained; according to the system information, the state information and the charging information, charging fault information of the power battery, fault information of the whole vehicle and pile end fault information of the charging pile are determined; the fault degree of the multi-pile charging process is judged according to the charging fault information, the fault information and the pile end faults; and controlling the charging process of the charging pile based on different fault degrees. According to the fault diagnosis method provided by the invention, processing can be carried out when a fault occurs in the process that the multiple charging piles charge the automobile at the same time, the battery protection and charging efficiency in the multi-pile charging process is improved, and the efficiency and safety of the automobile in the multi-pile charging process are ensured.

Description

Technical Field

[0001] The present invention relates to the field of charging technology, and in particular to a fault diagnosis method, device and vehicle for multi-pile charging. Background Art

[0002] As the demand for electric vehicle range continues to increase, battery capacity continues to increase. In order to improve the charging efficiency of electric vehicles, more and more electric vehicles support simultaneous charging at multiple charging piles. During charging, the power battery system, the vehicle end and multiple charging pile ends may all fail, which is more complicated than when charging with a single pile.

[0003] Appropriate charging fault diagnosis and treatment methods can ensure the safety of electric vehicles and their users. If there is a lack of appropriate fault diagnosis and treatment methods, the battery is likely to be overcharged, over-discharged, or even catch fire and explode during the charging process. Summary of the invention

[0004] The present invention provides a fault diagnosis method, device and vehicle for multi-pile charging, which judge the multi-pile charging process by simultaneously acquiring the power battery system information in the automobile, the status information of the whole vehicle and the charging information of multiple charging piles, and implements different processing means according to different fault degrees, thereby improving the protection of the battery and the charging efficiency during the multi-pile charging process, and ensuring the efficiency and safety of the automobile during the multi-pile charging process.

[0005] According to a first aspect of the present invention, a method for diagnosing a fault of a multi-pile charging station is provided, comprising:

[0006] Obtaining system information of the power battery, status information of the vehicle, and charging information of at least two charging piles;

[0007] Determine charging fault information of the power battery, fault information of the vehicle, and pile end fault information of the charging pile respectively according to the system information, the state information, and the charging information;

[0008] Determining the degree of failure of the multi-pile charging process according to the charging failure information, the failure information and the pile end failure;

[0009] The charging process of the charging pile is controlled based on the different fault degrees.

[0010] Optionally, determining charging fault information of the power battery, fault information of the whole vehicle, and pile end fault information of the charging pile respectively according to the system information, the state information, and the charging information includes:

[0011] Determining a charging fault level of the power battery according to a relationship between a voltage, a current, an insulation resistance and a temperature of the power battery and a fault level threshold;

[0012] Determining fault information of the whole vehicle according to an interactive message between the battery management system of the whole vehicle and the controller of the whole vehicle;

[0013] The pile-end fault information of the charging pile is determined according to the charging message between the charging pile and the battery management system of the whole vehicle; wherein the charging fault level includes level one fault, level two fault and level three fault; the severity of the level one fault is less than that of the level two fault, and the severity of the level two fault is less than that of the level three fault.

[0014] Optionally, judging the fault degree of the multi-pile charging process according to the charging fault information, the fault information and the pile end fault includes:

[0015] When the charging fault level is less than or equal to a level 2 fault, the fault level is determined to be a level 1 fault;

[0016] When a fault occurs at the end of at least one of the charging piles, the fault level is determined to be a Class II fault;

[0017] When the charging fault level is greater than a level 2 fault or the entire vehicle fails or all of the charging piles fail, the fault level is determined to be a level 3 fault.

[0018] Optionally, controlling the charging process of the charging pile based on different fault degrees includes:

[0019] When the fault level is a type I fault, the charging current of the charging pile is reduced.

[0020] Optionally, controlling the charging process of the charging pile based on different fault degrees includes:

[0021] When the fault level is a Class II fault, the charging process of the faulty charging pile is stopped, and the charging current of the normal charging pile is redistributed.

[0022] Optionally, controlling the charging process of the charging pile based on different fault degrees includes:

[0023] When the fault level is a Class III fault, the charging process of all the charging piles is stopped.

[0024] Optionally, after stopping the charging process of all the charging piles, the method further includes:

[0025] Alarm information is generated according to the three types of fault information and sent to the user end.

[0026] Optionally, the warning information includes at least one of the following: voice reminder, buzzer reminder and light reminder.

[0027] According to a second aspect of the present invention, a multi-pile charging fault diagnosis device is provided, the fault diagnosis device is used to perform the multi-pile charging fault diagnosis method described in any one of the first aspects, the fault diagnosis device comprising:

[0028] An acquisition module is used to obtain system information of the power battery, status information of the entire vehicle, and charging information of at least two charging piles;

[0029] A determination module, used to determine charging fault information of the power battery, fault information of the whole vehicle and pile end fault information of the charging pile respectively according to the system information, the state information and the charging information;

[0030] A judgment module, used for judging the fault degree of the multi-pile charging process according to the charging fault information, the fault information and the pile end fault;

[0031] A control module is used to control the charging process of the charging pile based on different fault degrees.

[0032] According to a third aspect of the present invention, a vehicle is provided, comprising the multi-pile charging fault diagnosis device according to the second aspect.

[0033] The present invention discloses a fault diagnosis method, device and vehicle for multi-pile charging, including: obtaining system information of a power battery, status information of a whole vehicle and charging information of at least two charging piles; determining charging fault information of the power battery, fault information of the whole vehicle and pile-end fault information of the charging pile according to the system information, status information and charging information; judging the fault degree of the multi-pile charging process according to the charging fault information, fault information and pile-end fault; and controlling the charging process of the charging pile based on different fault degrees. The present invention provides a fault diagnosis method for multi-pile charging, which judges the multi-pile charging process by simultaneously obtaining the power battery system information, the status information of the whole vehicle and the charging information of multiple charging piles in the car, and then executing different processing means according to different fault degrees, thereby improving the protection of the battery and the charging efficiency during the multi-pile charging process, and ensuring the efficiency and safety of the car during the multi-pile charging process.

[0034] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0036] Figure 1 This is a flow chart of a fault diagnosis method for multi-pile charging provided by an embodiment of the present invention;

[0037] Figure 2 is a flow chart of another multi-pile charging fault diagnosis method provided by an embodiment of the present invention;

[0038] Figure 3 is a flow chart of another multi-pile charging fault diagnosis method provided by an embodiment of the present invention;

[0039] Figure 4 is a flow chart of another multi-pile charging fault diagnosis method provided by an embodiment of the present invention;

[0040] Figure 5 It is a schematic diagram of current redistribution in a fault diagnosis method for multi-pile charging provided by an embodiment of the present invention;

[0041] Figure 6 is a flow chart of another multi-pile charging fault diagnosis method provided by an embodiment of the present invention;

[0042] Figure 7 The present invention provides a block diagram of a multi-pile charging fault diagnosis device. DETAILED DESCRIPTION

[0043] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0044] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0045] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0046] Figure 1 is a flow chart of a fault diagnosis method for multiple charging piles provided by an embodiment of the present invention, refer to Figure 1 The multi-pile charging fault diagnosis method provided in the embodiment of the present invention is mainly applied to the scenario where at least two charging piles charge the electric vehicle at the same time. It can be understood that it can also be applied to the scenario where one charging pile charges the electric vehicle. The fault diagnosis method includes:

[0047] S1. Obtain system information of the power battery, status information of the entire vehicle, and charging information of at least two charging piles.

[0048] Among them, the car's power battery is the core component of new energy vehicles, which directly affects the performance, cruising range and safety of the entire vehicle; the status information of the entire vehicle is information such as the parking status of the electric vehicle during the charging process; the charging information of the charging pile can include the messages exchanged between the charging pile and the battery management system.

[0049] Specifically, the system information of the power battery is obtained, which may include information such as the voltage, current, temperature and insulation resistance of the power battery. The status information of the whole vehicle includes information such as the parking status. The charging information of at least two charging piles is the charging information of all charging piles in the charging state during the charging process. The charging information includes the messages exchanged between the charging piles and the battery management system.

[0050] S2. Determine charging fault information of the power battery, fault information of the entire vehicle and pile end fault information of the charging pile respectively according to the system information, status information and charging information.

[0051] Specifically, the charging fault information of the power battery is determined according to the system information of the power battery obtained in the above step S1, that is, the charging fault information of the power battery is determined according to the relationship between the obtained voltage, current, temperature and insulation resistance and the set threshold value;

[0052] Determining the fault information of the vehicle according to the vehicle status information obtained in the above step S1 includes determining whether there is a fault that affects the charging function at the vehicle end other than the power battery system according to the interactive message between the battery management system and other controllers in the vehicle. For example, when the gear of the electric vehicle being charged is changed from the parking gear to the forward gear due to an accidental touch, the charging function of the electric vehicle will be affected.

[0053] According to the charging information of the charging pile obtained in the above step S1, determine whether the charging pile has a pile-end fault that affects the charging function, including charging pile overtemperature fault, charging connector fault, charging pile internal overtemperature fault, required power cannot be transmitted, charging pile emergency stop fault, charging pile other faults, charging pile current mismatch, charging pile abnormality and other faults. For details, see "National Standard 27930-2025".

[0054] S3. Determine the fault degree of the multi-pile charging process according to the charging fault information, fault information and pile end fault information.

[0055] Specifically, the fault levels of the multiple charging piles in the process of charging the electric vehicle are comprehensively judged according to the charging fault information of the power battery, the fault information of the whole vehicle and the pile end fault information of the charging pile determined in the above step S2.

[0056] S4. Control the charging process of the charging pile based on different fault levels.

[0057] Specifically, the fault level determined in the above step S3 is, for example, if the fault level is low, such as a Class I fault, the charging current of the charging pile is reduced without affecting the charging function; if the fault level is medium, such as a Class II fault, the charging pile corresponding to the fault is stopped, and the charging current of the charging pile is redistributed; if the fault level is high, such as a Class III fault, the charging process of all charging piles is stopped to avoid damage to the charging pile and the electric vehicle. Specific fault classification is described in detail in the following embodiments.

[0058] A multi-pile charging fault diagnosis method provided by an embodiment of the present invention determines the multi-pile charging process by simultaneously acquiring power battery system information in the automobile, status information of the entire vehicle, and charging information of multiple charging piles, and implements different processing methods according to different fault degrees, thereby improving battery protection and charging efficiency during the multi-pile charging process, and ensuring the efficiency and safety of the automobile during the multi-pile charging process.

[0059] On the basis of the above-mentioned embodiments of the invention, the embodiments of the invention further refine the determination of charging fault information of the power battery, fault information of the whole vehicle and fault information of the charging pile end according to the system information, state information and charging information. Figure 2 is another flow chart of a multi-pile charging fault diagnosis method provided by an embodiment of the present invention, refer to Figure 2 The fault diagnosis method for multiple charging piles provided by the embodiment of the present invention includes:

[0060] S21. Obtain system information of the power battery, status information of the entire vehicle, and charging information of at least two charging piles.

[0061] S22. Determine the charging fault level of the power battery according to the relationship between the voltage, current, insulation resistance and temperature of the power battery and the fault level threshold; determine the fault information of the whole vehicle according to the interactive message between the battery management system of the whole vehicle and the controller of the whole vehicle; determine the pile end fault information of the charging pile according to the charging message between the charging pile and the battery management system of the whole vehicle.

[0062] Specifically, the charging fault level of the power battery is determined according to the relationship between the voltage, current, insulation resistance and temperature of the power battery and the fault level threshold. Since different manufacturers have different fault standards when producing different types of power batteries, the fault level thresholds are also different. The specific fault level thresholds are determined by the manufacturer's standards for producing the power batteries. The charging fault levels of the power battery include level one fault, level two fault and level three fault, where the severity levels are, from small to large, level one fault, level two fault and level three fault. Exemplarily, a level one fault is a battery charging fault that does not affect the charging function and performance; a level two fault is a fault that affects the charging performance but not the charging function; a level three fault is a fault that affects the charging function.

[0063] Determining the fault information of the vehicle based on the interactive messages between the battery management system of the vehicle and the controller of the vehicle includes confirming whether there is any vehicle charging fault that affects the charging function other than the power battery management system on the vehicle side, such as parking failure.

[0064] The charging pile-end fault information is determined based on the charging message between the charging pile and the battery management system of the whole vehicle, including charging pile overtemperature fault, charging connector fault, charging pile internal overtemperature fault, failure to transmit the required power, charging pile emergency stop fault, other charging pile faults, charging pile current mismatch, charging pile abnormality and other faults.

[0065] S23. Determine the fault degree of the multi-pile charging process according to the charging fault information, the fault information and the pile end fault information.

[0066] S24. Control the charging process of the charging pile based on different fault degrees.

[0067] On the basis of the above-mentioned embodiments of the invention, the embodiments of the invention further refine the fault degree of the multi-pile charging process according to the charging fault information, the fault information and the pile end fault information. Figure 3 is another flow chart of a multi-pile charging fault diagnosis method provided by an embodiment of the present invention, refer to Figure 3 The fault diagnosis method for multiple charging piles provided by the embodiment of the present invention includes:

[0068] S31, obtaining system information of the power battery, status information of the entire vehicle, and charging information of at least two charging piles.

[0069] S32. Determine charging fault information of the power battery, fault information of the entire vehicle, and pile end fault information of the charging pile respectively according to the system information, the status information, and the charging information.

[0070] S33. When the charging fault level is less than or equal to the second-level fault, the fault degree is determined to be a Class I fault; when a fault occurs at the end of at least one charging pile, the fault degree is determined to be a Class II fault; when the charging fault level is greater than the second-level fault or the entire vehicle fails or all charging piles fail, the fault degree is determined to be a Class III fault.

[0071] Specifically, when the charging fault level is less than or equal to a level 2 fault, that is, a battery charging fault that does not affect the charging function and performance or a fault that affects the charging performance but does not affect the charging function occurs in the power battery system, the fault level in the multi-pile charging process is determined to be a level 1 fault;

[0072] Since multiple charging piles charge electric vehicles at the same time, when a fault occurs at the end of at least one charging pile, the fault level is determined to be a Class II fault;

[0073] When the charging fault level is greater than the second level fault (that is, the charging fault level is the third level fault) or the entire vehicle fails or all charging piles fail, the fault level is determined to be a third level fault, which is the most serious fault level.

[0074] Optionally, judging the fault degree of the multi-pile charging process according to the charging fault information, the fault information and the pile end fault information further includes:

[0075] When the charging fault information is no fault information, the status information of the whole vehicle is normal, and the charging information of all charging piles is normal, it is determined that the charging process of the charging pile is fault-free.

[0076] Specifically, when the charging fault information of the power battery obtained in the above step S31 is no fault information, the status information of the whole vehicle is normal (that is, when the parking status of the whole vehicle is normal), and the messages between all charging piles and the battery management system are normal, it is determined that the charging process of the charging pile is fault-free and the charging process continues.

[0077] On the basis of the above-mentioned embodiment of the invention, the embodiment of the invention further refines the control of the charging process of the charging pile based on different fault levels. Figure 4 is another flow chart of a multi-pile charging fault diagnosis method provided by an embodiment of the present invention, refer to Figure 4 The fault diagnosis method for multiple charging piles provided by the embodiment of the present invention includes:

[0078] S41, obtaining system information of the power battery, status information of the entire vehicle, and charging information of at least two charging piles.

[0079] S42: Determine charging fault information of the power battery, fault information of the entire vehicle, and pile end fault information of the charging pile respectively according to the system information, the status information, and the charging information.

[0080] S43: Determine the fault degree of the multi-pile charging process according to the charging fault information, the fault information and the pile end fault information.

[0081] S4401. When the fault degree is a Class I fault, reduce the charging current of the charging pile.

[0082] Specifically, when the fault level is a Class I fault, the charging process is not stopped, only the charging current of the charging pile is reduced, and a request is made to each charging pile to reduce the size of the charging current through a charging message. For example, assuming that there are N charging piles charging the vehicle, the battery management system requests currents of I and I and I to each charging pile before the fault respectively. BR1 , I BR2 , I BR3 , ...I BRN ; After a fault occurs, the battery management system requests current from each charging pile as I BR1 ×C,I BR2 ×C,I BR3 ×C, ...I BRN ×C; where 0<C<1, it can be set as needed. For example: an electric car is charged by three charging piles at the same time; before the fault occurs, the requested current of each pile is 200A. When a battery overtemperature level 2 fault occurs, the battery management system reduces the requested current to each charging pile from 200A to 100A (C=0.5).

[0083] On the basis of the above-mentioned embodiment of the invention, the embodiment of the invention further refines the charging process of the charging pile based on the different fault levels. Figure 4 The fault diagnosis method for multi-pile charging provided by the embodiment of the present invention also includes:

[0084] S4402: When the fault level is a Class II fault, the charging process of the faulty charging pile is stopped, and the charging current of the normal charging pile is redistributed.

[0085] Figure 5 is a schematic diagram of current redistribution in a fault diagnosis method for multiple charging piles provided by an embodiment of the present invention, with reference to Figure 5 Specifically, when the fault level is a Class II fault, the charging process of the faulty charging pile is stopped, and the charging current of the normal charging pile is redistributed at the same time. For example, assuming that there are N charging piles in total, i of them have a fault that cannot be charged (i<N), and the remaining piles that can be charged normally are s1, s2, s3...s (N-i) ; The requested current of the power battery management system is I BR , the requested current for each pile is I BR1 , I BR2 , I BR3 , ...I (BRN-i) ; The maximum charging current that each charging pile can provide is I S1 , I S2 , I S3 , ...I (SN-i) , redistribute the current as Figure 5 As shown:

[0086] Determine the power system's requested current I BR Is it less than the maximum charging current I of the first charging pile? S1 That is I BR S1 ,

[0087] If so, the first charging pile is charged with the maximum charging current, and the second to (Ni)th charging piles are not charged, that is, I BR1 =I BR , I BR2 =I BR3 =…=I BRN-i =0;

[0088] If not, continue to determine whether the difference between the requested current of the power system and the requested current of the power system for the first charging pile is less than the maximum charging current of the second charging pile, that is, I BR -I BR1 S2 ,

[0089] ​​If so, the first charging pile is charged with the maximum charging current, the second charging pile is charged with the current value of the difference between the requested current of the power system and the requested current of the power system for the first charging pile, and the third to (Ni)th charging piles are not charged, that is, I BR1 =I S1 , I BR2 =I BR -I BR1 , I BR3 =…=I BRN-i =0;

[0090] If not, continue to determine whether the requested current of the power system minus the requested current of the power system for the first charging pile minus the requested current of the power system for the second charging pile is less than the maximum charging current of the third charging pile, that is, I BR -I BR1 -I BR2 S3 ;

[0091] If so, the first charging pile and the second charging pile are charged with the maximum charging current respectively, the third charging pile is charged with the current value of the power system's request current - the power system's request current for the first charging pile - the power system's request current for the second charging pile, and the fourth charging pile to the (Ni)th charging pile are not charged, that is, I BR1 =I S1 , I BR2 =I S2 , I BR3 =I BR -I BR1 -I BR2 , I BR4 =…=I BRN-i =0;

[0092] If not, and so on, continue to determine whether the requested current of the power system - the requested current of the power system to the first charging pile - the requested current of the power system to the second charging pile - the requested current of the (Ni)th charging pile is less than the maximum charging current of the (Ni)th charging pile, that is, I BR -I BR1 -I BR2 -…-I BRN-i SN-i ;

[0093] If so, the first charging pile - the (Ni-1)th charging pile are charged with the maximum charging current respectively, and the (Ni)th charging pile is charged with the current value of the power system's request current - the power system's request current for the first charging pile - the power system's request current for the second charging pile - the (Ni)th charging pile's request current, that is, I BR1 ​​=I S1 , I BR2 =I S2 ,…I BRN-i =I SN-i-1 , I BRN-i =I BR -I BR1 -I BR2 -…-I BRN-i-1 ;

[0094] If not, the first charging pile to the (Ni-1)th charging pile are charged with the maximum charging current respectively, and the (Ni)th charging pile is charged with the maximum charging current, that is, I BR1 =I S1 , I BR2 =I S2 ,…I BRN-i-1 =I SN-i-1 , I BRN-i =I SN-i For ease of understanding, for example, assume that an electric car is charged by three charging piles at the same time, the total current required by the power battery system is 600A, and the maximum required current that each charging pile can provide is 250A. When a charging pile has a pile-end failure, the battery management system stops the interaction process with the pile, and the battery management system requests 250A current from the other two charging piles respectively.

[0095] On the basis of the above-mentioned embodiment of the invention, the embodiment of the invention further refines the charging process of the charging pile based on the different fault levels. Figure 4 The fault diagnosis method for multi-pile charging provided by the embodiment of the present invention also includes:

[0096] S4403: When the fault level reaches Category III, the charging process of all charging piles is stopped.

[0097] Specifically, when the fault level reaches the third category, a serious charging fault has occurred, and the charging process of all charging piles that are charging the electric vehicle is stopped. For example, an electric vehicle is being charged by three charging piles at the same time. When a third-level power battery fault or a charging prohibition fault occurs on the vehicle side or a pile-side fault occurs on all charging piles, the battery management system immediately stops the charging process of all charging piles.

[0098] Based on the above-mentioned embodiment of the invention, the embodiment of the present invention further refines the charging process after stopping all charging piles. Figure 6 is another flow chart of a multi-pile charging fault diagnosis method provided by an embodiment of the present invention, refer to Figure 6 The fault diagnosis method for multiple charging piles provided by the embodiment of the present invention includes:

[0099] S51, obtaining system information of the power battery, status information of the entire vehicle, and charging information of at least two charging piles.

[0100] S52: Determine charging fault information of the power battery, fault information of the entire vehicle, and pile end fault information of the charging pile respectively according to the system information, the state information, and the charging information.

[0101] S53: Determine the fault degree of the multi-pile charging process according to the charging fault information, the fault information and the pile end fault information.

[0102] S5403: When the fault level reaches Category III, the charging process of all charging piles is stopped.

[0103] S55. Generate alarm information according to the three types of fault information and send it to the user end.

[0104] Specifically, when the fault degree is determined to be a Class III fault by the above step S5403, an alarm message is generated according to the Class III fault information and sent to the user end to remind the user to cut off the power supply in time to avoid damage to the electric vehicle and the charging pile.

[0105] Optionally, the warning information includes at least one of the following: voice reminder, buzzer reminder and light reminder.

[0106] Specifically, exemplarily, the buzzer reminder may include a buzzer, and the light reminder may include a light emitting diode.

[0107] According to the same inventive concept, Figure 7 is a block diagram of a multi-pile charging fault diagnosis device provided by an embodiment of the present invention, refer to Figure 7 The embodiment of the present invention provides a multi-pile charging fault diagnosis device, which is used to perform any of the multi-pile charging fault diagnosis methods in the above-mentioned invention embodiments, and the fault diagnosis device includes:

[0108] The acquisition module 1 is used to acquire the system information of the power battery, the status information of the whole vehicle and the charging information of at least two charging piles.

[0109] The determination module 2 is used to determine the charging fault information of the power battery, the fault information of the whole vehicle and the pile end fault information of the charging pile according to the system information, the state information and the charging information.

[0110] The judgment module 3 is used to judge the fault degree of the multi-pile charging process according to the charging fault information, the fault information and the pile end fault information.

[0111] The control module 4 is used to control the charging process of the charging pile based on different fault degrees.

[0112] A multi-pile charging fault diagnosis device provided in an embodiment of the present invention can achieve the same technical effect as a multi-pile charging fault diagnosis method provided in the above-mentioned embodiment of the invention, which will not be described in detail here.

[0113] According to the same inventive concept, an embodiment of the present invention provides a vehicle, comprising the multi-pile charging fault diagnosis device of the above-mentioned invention embodiment.

[0114] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A fault diagnosis method for multi-pile charging, characterized in that: include: Obtaining system information of the power battery, status information of the vehicle, and charging information of at least two charging piles; Determine charging fault information of the power battery, fault information of the whole vehicle and pile end fault information of the charging pile respectively according to the system information, the state information and the charging information; Determining the degree of fault in the multi-pile charging process according to the charging fault information, the fault information and the pile end fault information; The charging process of the charging pile is controlled based on the different fault degrees.

2. The fault diagnosis method for multi-pile charging according to claim 1, characterized in that: Determining charging fault information of the power battery, fault information of the whole vehicle, and pile end fault information of the charging pile respectively according to the system information, the state information, and the charging information, including: Determining a charging fault level of the power battery according to a relationship between a voltage, a current, an insulation resistance and a temperature of the power battery and a fault level threshold; Determining fault information of the whole vehicle according to the interactive message between the battery management system of the whole vehicle and the controller of the whole vehicle; The pile-end fault information of the charging pile is determined according to the charging message between the charging pile and the battery management system of the whole vehicle; wherein the charging fault level includes level one fault, level two fault and level three fault; the severity of the level one fault is less than that of the level two fault, and the severity of the level two fault is less than that of the level three fault.

3. The fault diagnosis method for multi-pile charging according to claim 2, characterized in that: The fault degree of the multi-pile charging process is judged according to the charging fault information, the fault information and the pile end fault information, including: When the charging fault level is less than or equal to a level 2 fault, the fault level is determined to be a level 1 fault; When a fault occurs at the end of at least one of the charging piles, the fault level is determined to be a Class II fault; When the charging fault level is greater than a level 2 fault or the entire vehicle fails or all of the charging piles fail, the fault level is determined to be a level 3 fault.

4. The fault diagnosis method for multi-pile charging according to claim 3, characterized in that: Controlling the charging process of the charging pile based on different fault levels includes: When the fault level is a type I fault, the charging current of the charging pile is reduced.

5. The fault diagnosis method for multi-pile charging according to claim 3, characterized in that: Controlling the charging process of the charging pile based on different fault levels includes: When the fault level is a Class II fault, the charging process of the faulty charging pile is stopped, and the charging current of the normal charging pile is redistributed.

6. The fault diagnosis method for multi-pile charging according to claim 3, characterized in that: Controlling the charging process of the charging pile based on different fault levels includes: When the fault level is a Class III fault, the charging process of all the charging piles is stopped.

7. The fault diagnosis method for multi-pile charging according to claim 6, characterized in that: After stopping the charging process of all the charging piles, the method further comprises: Alarm information is generated according to the three types of fault information and sent to the user end.

8. The fault diagnosis method for multi-pile charging according to claim 7, characterized in that: The warning information includes at least one of the following: voice reminder, buzzer reminder and light reminder.

9. A fault diagnosis device for multi-pile charging, characterized in that: The fault diagnosis device is used to execute the multi-pile charging fault diagnosis method according to any one of claims 1 to 8, and the fault diagnosis device comprises: An acquisition module is used to obtain system information of the power battery, status information of the entire vehicle, and charging information of at least two charging piles; A determination module, used to determine the charging fault information of the power battery, the fault information of the whole vehicle and the pile end fault information of the charging pile respectively according to the system information, the state information and the charging information; A judgment module, used for judging the fault degree of the multi-pile charging process according to the charging fault information, the fault information and the pile end fault information; A control module is used to control the charging process of the charging pile based on different fault degrees.

10. A vehicle, characterized in that: Including the fault diagnosis device for multi-pile charging as described in claim 9.

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