Charging diagnosis method and device, battery management system and vehicle

Abstract

The application discloses a charging diagnosis method and device, a battery management system and a vehicle. The charging diagnosis method detects a voltage parameter of another charging circuit of a double charging socket when one charging socket of the double charging socket starts receiving charging power input by a charging gun. If there is an error in wiring of the double charging socket, an abnormality of electrification occurs in the other charging socket, and thus whether the wiring of the double charging socket is abnormal can be determined according to the voltage parameter of the charging circuit of the other charging socket at this time, and the scheme is simple and reliable.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of charging management, in particular to a charging diagnosis method of a double charging socket, a battery management system (BMS) and a vehicle. BACKGROUND

[0002] For new energy electric vehicle products, charging is an essential function. For example, if the high-voltage line (i.e. positive and negative charging bus) or low-voltage line (i.e. communication line, such as detection signal line CC2) of the vehicle charging circuit is connected incorrectly, and an incomplete GB / T27930 standard charging pile is used for single-gun charging, the vehicle end charging circuit detection cannot determine that there is a line connection error, and the charging process will still be entered. This will cause the other charging port of the vehicle that is not plugged in to be live, which poses a risk of electric shock. SUMMARY

[0003] In view of the above problems, the embodiments of the present application provide a charging diagnosis method, device, battery management system and vehicle, which can solve the problem of the charging port of the vehicle that is not plugged in being live when the charging circuit line of the double-gun charging vehicle is connected incorrectly.

[0004] In a first aspect, the embodiments of the present application provide a charging diagnosis method of a double charging socket, comprising:

[0005] In the case that one charging socket of the double charging socket is plugged with a charging gun, detecting a voltage parameter of a charging circuit of the other charging socket of the double charging socket;

[0006] According to the voltage parameter, determining whether the wiring of the double charging socket is abnormal.

[0007] In the technical solution of the embodiments of the present application, when charging a device with a double charging socket, when one charging socket starts to receive the charging power input by the charging gun, the voltage parameter of the other charging circuit is detected at the same time. If there is an error in the wiring of the double charging socket, the other charging socket will be abnormally live. Therefore, whether the wiring of the double charging socket is abnormal can be determined according to the voltage parameter of the charging circuit of the other charging socket at this time. The scheme is simple and reliable, and can solve the problem of the charging port of the vehicle that is not plugged in being live when the charging circuit line of the double-gun charging vehicle is connected incorrectly.

[0008] In some embodiments, the detection of the voltage parameter of the charging circuit of the other charging socket of the double charging socket comprises:

[0009] Detecting the voltage drop between the outer ends of the positive and negative relays in the charging circuit of the other charging socket of the double charging socket.

[0010] In the technical solution of the embodiment of the application, the outer end of the negative electrode relay is connected to the charging interface. If there is an error in the connection of the low-voltage line, the high-low-voltage line, or the positive electrode of the high-voltage line of the BMS, when one of the charging sockets starts charging, at least the following error exists in the charging circuit of the other charging socket: the outer end of the negative electrode relay is connected to the negative electrode of the charging gun, so that the outer end of the negative electrode relay is electrified. Therefore, whether the wiring of the double charging socket is abnormal can be determined by detecting the voltage drop between the positive electrode of the battery and the outer end of the negative electrode relay. This detection method is simple and reliable.

[0011] In some embodiments, the detection of the voltage parameter of the charging circuit of the other charging socket of the double charging socket includes:

[0012] The voltage between the outer end of the positive electrode relay and the negative electrode of the battery in the charging circuit of the other charging socket of the double charging socket is detected.

[0013] In the technical solution of the embodiment of the application, the outer end of the positive electrode relay is connected to the charging interface. If there is an error in the connection of the low-voltage line, the high-low-voltage line, or the positive electrode of the high-voltage line of the BMS, when one of the charging sockets starts charging, at least the following error exists in the charging circuit of the other charging socket: the outer end of the positive electrode relay is connected to the positive electrode of the charging gun, so that the outer end of the positive electrode relay is electrified. Therefore, whether the wiring of the double charging socket is abnormal can be determined by detecting the voltage drop between the positive electrode relay and the negative electrode of the battery. This detection method is simple and reliable.

[0014] In some embodiments, the determination of whether the wiring of the double charging socket is abnormal according to the voltage parameter includes:

[0015] The voltage drop is compared with the battery voltage, and whether the wiring of the double charging socket is abnormal is determined according to the comparison result.

[0016] In the technical solution of the embodiment of the application, due to the error in the wiring of the double charging socket, when single-gun charging is performed, the other charging socket is electrified. Therefore, after the voltage (i.e., the voltage drop described above) in the charging circuit of the other charging socket is measured, the voltage is compared with the battery voltage, and whether the other charging socket is electrified is determined according to the relationship between the two. In addition, the battery voltage is easy to obtain during the charging process, so this determination strategy is simple and reliable.

[0017] In some embodiments, the comparison of the voltage parameter with the battery voltage and the determination of whether the wiring of the double charging socket is abnormal according to the comparison result include:

[0018] The difference between the voltage drop and the battery voltage is calculated.

[0019] If the difference is lower than a voltage difference threshold, it is determined that the wiring of the double charging socket is abnormal.

[0020] In the technical solution of the embodiments of the present application, in order to improve the charging efficiency, in a large-current charging scheme, the charging voltage is usually adjusted to be slightly larger than the battery voltage. Due to the error in the wiring of the double charging socket, when single-gun charging, the voltage of the other charging socket (i.e. the above-mentioned voltage drop) can be considered as the charging voltage. A threshold voltage difference range of 2% to 15% of the battery voltage can be set, and the value can be selected according to the situation. Therefore, if the difference between the detected voltage and the battery voltage is less than the threshold voltage difference, it is considered that the other charging socket is electrified, and the wiring of the double charging socket is abnormal.

[0021] In some embodiments, after determining whether the wiring of the double charging socket is abnormal according to the voltage parameter, the method further comprises:

[0022] If the wiring of the double charging socket is abnormal, a stop charging instruction is sent to the charging pile.

[0023] In the technical solution of the embodiments of the present application, after determining that the wiring of the double charging socket is abnormal, in order to ensure the safety of electricity and equipment, a stop charging instruction is sent to the charging pile to stop the output of charging power by the charging pile.

[0024] In some embodiments, after determining whether the wiring of the double charging socket is abnormal according to the voltage parameter, the method further comprises:

[0025] If the wiring of the double charging socket is abnormal, the double charging socket is reported to the device where the double charging socket is located.

[0026] In the technical solution of the embodiments of the present application, after determining that the wiring of the double charging socket is abnormal, in order to ensure the safety of the device, the user is reminded to maintain the wiring of the double charging socket of the device.

[0027] In some embodiments, after determining whether the wiring of the double charging socket is abnormal according to the voltage parameter, the method further comprises:

[0028] If the wiring of the double charging socket is abnormal, both charging loops of the double charging socket are controlled to be disconnected.

[0029] In the technical solution of the embodiments of the present application, after determining that the wiring of the double charging socket is abnormal, in order to ensure the safety of electricity and equipment, the BMS immediately controls the charging loop of the double charging socket to be disconnected, so as to ensure the safety of the device and the user.

[0030] In some embodiments, before detecting the voltage parameter of the charging loop of the other charging socket of the double charging socket in the case that the charging gun is plugged into one charging socket of the double charging socket, the method comprises:

[0031] In response to the charging connection signal sent by the charging pile, closing the charging loop of the charging socket corresponding to the charging connection signal;

[0032] In response to the CRO packet sent by the charging pile, sending a BCL packet to the charging pile;

[0033] Entering the charging process.

[0034] In the technical solution of the embodiments of the present application, after the charging gun is inserted, the BMS will close the relay of the high-voltage cable of the charging connection signal corresponding charging loop according to the valid charging connection signal (from the charging gun CC2_1 or CC2_2 port), thereby closing the charging loop, and then after the charging voltage and current are matched, the charging pile outputs the corresponding charging power to the charging socket. This process conforms to the general charging standard.

[0035] In some embodiments, the closing of the charging loop of the charging socket corresponding to the charging connection signal in response to the charging connection signal sent by the charging pile comprises:

[0036] In response to the valid charging connection signal sent by the charging pile when the charging gun is inserted, performing a national standard charging handshake and parameter configuration interaction with the charging pile;

[0037] Closing the charging loop of the charging socket corresponding to the valid charging connection signal.

[0038] In a second aspect, the embodiments of the present application provide a charging diagnosis device, comprising:

[0039] The detection module is configured to detect the voltage parameter of the charging loop of the other charging socket of the double charging socket in the case that the charging gun is plugged into one charging socket of the double charging socket;

[0040] The judgment module is configured to determine whether the wiring of the double charging socket is abnormal according to the voltage parameter.

[0041] In the technical solution of the embodiment of the application, when charging the device with the double charging socket, the voltage parameter of the other charging circuit is detected by the simultaneous detection module when one of the charging sockets starts to receive the charging power input by the charging gun. If there is an error in the wiring of the double charging socket, the other charging socket will be abnormally electrified. Therefore, the determination module can determine whether the wiring of the double charging socket is abnormal according to the voltage parameter of the charging circuit of the other charging socket at this time. The scheme is simple and reliable, and can solve the problem that the charging circuit of the double-gun charging vehicle is connected incorrectly, and the charging port that is not inserted by the charging gun is electrified when single-gun charging.

[0042] In a third aspect, the application provides a battery management system, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements the steps of the charging diagnosis method of the double charging socket as described above when executing the computer program.

[0043] In a fourth aspect, the application provides a vehicle, comprising a battery, a double charging socket, and the battery management system described above.

[0044] In the fourth aspect, the application provides a vehicle, comprising a battery, a double charging socket, and the battery management system described above.

[0045] The above description is only a summary of the technical solutions of the application. In order to enable one skilled in the art to better understand the technical means of the application, the content of the specification can be implemented, and in order to enable the above and other purposes, features and advantages of the application to be more obvious and easy to understand, the following specific embodiments of the application are described. BRIEF DESCRIPTION OF DRAWINGS

[0046] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are intended to only illustrate preferred embodiments and are not considered limiting of the application. Moreover, like reference numerals are intended to denote like parts throughout the various drawings. In the drawings:

[0047] Figure 1 Normal wiring diagram for double-gun charging socket and BMS;

[0048] Figure 2 Schematic diagram of signal detection line of double-gun charging socket and BMS connected in reverse;

[0049] Figure 3 Schematic diagram for reverse connection of double-gun charging socket and relay of BMS;

[0050] Figure 4 Schematic diagram for reverse connection of positive electrode of double-gun charging socket;

[0051] Figure 5 Schematic diagram for reverse connection of negative electrode of double-gun charging socket;

[0052] Figure 6 Flow chart of charging diagnosis method provided for some embodiments of the present application;

[0053] Figure 7 Flow chart of charging diagnosis method provided for some embodiments of the present application;

[0054] Figure 8 Flow chart of charging diagnosis method provided for some embodiments of the present application;

[0055] Figure 9 Flow chart of charging diagnosis method provided for some embodiments of the present application;

[0056] Figure 10 Module diagram of charging diagnosis device provided for some embodiments of the present application;

[0057] Figure 11 Module diagram of BMS provided for some embodiments of the present application;

[0058] The reference signs in the detailed description are as follows:

[0059] Charging diagnosis device 10, detection module 101, judgment module 102;

[0060] BMS 100, processor 12, memory 13, computer program 14, first charging socket 110, second charging socket 120, charging gun 200;

[0061] First positive electrode relay K11, first negative electrode relay K12, second positive electrode relay K21, second negative electrode relay K22, battery positive electrode BAT+, battery negative electrode BAT-, signal detection lines CC2_1, CC2_2, charging voltage U1, voltage drops U2, U3, U4, U5. DETAILED DESCRIPTION

[0062] The embodiments of the technical solutions of the present application will be described in detail below in combination with the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0063] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application; the use of the terms "including," "comprising," or "having" and variations thereof herein is intended to be broad and encompass the terms "consisting of" and "consisting essentially of" and variations thereof. Unless otherwise noted, the terms "including" and "comprising" are open-ended and do not exclude the presence of unrecited elements or limitations.

[0064] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0065] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to each other. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0066] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which means that there are three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" relationship.

[0067] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0068] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as limiting the embodiments of the present application. The orientation or position of the device or element indicated, and therefore cannot be understood as limiting the embodiments of the present application.

[0069] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be direct connection, can also be indirect connection through an intermediate medium, can be internal communication of two elements or interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0070] Please refer to Figure 1 , which shows the wiring diagram of a normal double-gun charging socket and the BMS 100.

[0071] Among them, in the charging loop of the first charging socket 110, the positive electrode of the first charging socket 110 is connected to the outer end of the first positive electrode relay K11 in the BMS 100 through a high-voltage cable, and the inner end of the first positive electrode relay K11 is connected to the positive electrode BAT+ of the battery; the negative electrode of the first charging socket 110 is connected to the outer end of the first negative electrode relay K12 in the BMS 100 through a high-voltage cable, and the inner end of the first negative electrode relay K12 is connected to the negative electrode BAT- of the battery; the low-voltage signal detection line CC2_1 of the first charging socket 110 is connected to a detection end (not shown) of the BMS 100 through a low-voltage cable.

[0072] Among them, in the charging loop of the second charging socket 120, the positive electrode of the second charging socket 120 is connected to the outer end of the second positive electrode relay K21 in the BMS 100 through a high-voltage cable, and the inner end of the second positive electrode relay K21 is connected to the positive electrode BAT+ of the battery; the negative electrode of the second charging socket 120 is connected to the outer end of the second negative electrode relay K22 in the BMS 100 through a high-voltage cable, and the inner end of the second negative electrode relay K22 is connected to the negative electrode BAT- of the battery; the low-voltage signal detection line CC2_2 of the second charging socket 120 is connected to the other detection end (not shown) of the BMS 100 through a low-voltage cable.

[0073] Among them, the outer end of the above-mentioned relay and the outer end of the charging loop refer to the end connected to the charging socket, which is directly electrically connected to the terminal of the charging socket, and the inner end of the relay and the charging loop is the end connected to the battery. The signal detection lines CC2_1 and CC2_2 are used for data exchange, such as waking up the BMS 100, before charging, during charging and at the end of charging.

[0074] Please refer to Figure 2 , which shows a schematic diagram of the signal detection lines CC2_1 and CC2_2 of the first charging socket 110 and the second charging socket 120 in a double-gun charging socket being connected reversely. Please refer to Figure 3Figure 2 shows a schematic diagram of a first charging socket 110 and a second charging socket 120 in a double-gun charging socket, and a relay in the BMS 100 being connected reversely. Please refer to Figure 4 Figure 3 shows a schematic diagram of a first charging socket 110 and a second charging socket 120 in a double-gun charging socket, and the positive electrode of the first charging socket 110 being connected to a different loop reversely. Please refer to Figure 5 Figure 4 shows a schematic diagram of a first charging socket 110 and a second charging socket 120 in a double-gun charging socket, and the negative electrode of the first charging socket 110 being connected to a different loop reversely.

[0075] Generally, a standard-compliant charging pile judges the voltage of the vehicle-side charging loop (i.e., the charging socket), and sends a charging pile output ready (such as CRO=AA) instruction if the voltage is normal, and then enters the charging process, while stops charging if the voltage is abnormal. A charging pile that does not fully comply with the standard may not be able to judge the above-mentioned wiring errors, and thus continues to send a charging pile output ready instruction, thereby entering the charging process, while the vehicle enters invalid charging without charging current, and the un-plugged charging socket is live.

[0076] The charging diagnosis method, device, BMS and vehicle provided by the present application can recognize the above-mentioned double charging socket wiring errors, thereby stopping charging and reporting the abnormality to the whole vehicle, avoiding invalid charging, and avoiding the risk of the other un-plugged charging socket being live when single-gun charging.

[0077] Please refer to Figure 6 , Figure 6 The flowchart of the charging diagnosis method provided by some embodiments of the present application is shown in Figure 2, and please refer to Figures 2 to 5 The charging diagnosis method comprises the following steps.

[0078] Step S110, detecting the voltage parameter of the charging loop of the other charging socket of the double charging socket when one charging socket of the double charging socket is plugged with a charging gun.

[0079] Step S120, determining whether the wiring of the double charging socket is abnormal according to the voltage parameter.

[0080] In some cases, such as the first charging socket 110 (i.e. one of the charging sockets) has a charging gun 200 inserted, assuming that the signal detection line CC2_1 is not connected incorrectly, the BMS 100 detects the voltage parameter of the charging circuit of the other charging socket 120 through the signal detection line CC2_1, and determines the connection abnormality of the double charging socket according to the voltage parameter.

[0081] In some cases, such as the first charging socket 110 has a charging gun 200 inserted, assuming that the signal detection lines CC2_1, CC2_2 are connected incorrectly, the BMS 100 detects the voltage parameter of the charging circuit of the other charging socket 120 through the signal detection line CC2_2, and determines the connection abnormality of the double charging socket according to the voltage parameter.

[0082] In some cases, such as the first charging socket 110 has a charging gun 200 inserted, assuming that the signal detection lines CC2_1, CC2_2 are connected incorrectly, the BMS 100 detects the voltage parameter of the charging circuit of the other charging socket 120 through the signal detection line CC2_2, and determines the connection abnormality of the double charging socket according to the voltage parameter.

[0083] The connection abnormality diagnosis method of the double charging socket is simple and reliable, and can solve the problem of charging circuit line connection error of the double gun charging vehicle, and the problem of charging port not inserted by the other charging socket being charged when single gun charging.

[0084] In some embodiments, in step S110, the voltage parameter of the charging circuit of the other charging socket is detected, including: detecting the voltage drop between the positive electrode BAT+ of the battery in the charging circuit of the other charging socket and the outer end of the negative electrode relay.

[0085] In some embodiments, the outer ends of the first negative electrode relay K21 and the second negative electrode relay K22 are connected to the charging socket, and at this time, if the connection of the double charging socket and the BMS is incorrect, the signal detection lines CC2_1, CC2_2 (seeFigure 2 ), or the signal detection lines CC2_1, CC2_2 of the double charging socket and the positive and negative poles (see Figure 3 ), or the negative pole of the double charging socket (see Figure 4 ) are incorrectly connected. For example, if the charging gun 200 is inserted into the first charging socket 110, at least one of the following exists in the charging circuit of the second charging socket 120: the outer end of the first negative pole relay K12 or the second negative pole relay K22 is connected to the negative pole of the charging gun 200, so that the outer end of the first negative pole relay K12 or the second negative pole relay K22 is electrified.

[0086] Therefore, whether the connection of the signal detection lines CC2_1, CC2_2 of the double charging socket (see Figure 2 ) or the signal detection lines CC2_1, CC2_2 of the double charging socket and the positive and negative poles (see Figure 3 ) is abnormal can be determined by detecting the voltage drop U2 between the positive pole of the battery BAT+ and the outer end of the first negative pole relay K12; whether the connection of the negative pole of the double charging socket (see Figure 4 ) is abnormal can be determined by detecting the voltage drop U4 between the positive pole of the battery BAT+ and the outer end of the second negative pole relay K22.

[0087] If the charging gun 200 is inserted into the second charging socket 120, the above example can be referred to, and the description will not be repeated here.

[0088] In some embodiments, in step S110, detecting the voltage parameter of the charging circuit of the other charging socket includes: detecting the voltage drop between the outer end of the positive pole relay in the charging circuit of the other charging socket and the negative pole of the battery BAT-.

[0089] Wherein, the outer ends of the first positive pole relay K11 and the second positive pole relay K12 are connected to the charging interface, at this time, if the signal detection lines CC2_1, CC2_2 of the connection of the double charging socket and the BMS (see Figure 2 ), or the signal detection lines CC2_1, CC2_2 of the double charging socket and the positive and negative poles (see Figure 3 ), or the positive pole of the double charging socket (see Figure 5 ) are incorrectly connected. For example, if the charging gun 200 is inserted into the first charging socket 110, at least one of the following exists in the charging circuit of the second charging socket 120: the outer end of the first positive pole relay K11 or the second positive pole relay K21 is connected to the positive pole of the charging gun 200, so that the outer end of the second positive pole relay K21 is electrified.

[0090] Therefore, whether the connection of the signal detection lines CC2_1, CC2_2 of the double charging socket (see Figure 2 ) or the connection of the signal detection lines CC2_1, CC2_2 of the double charging socket and the positive and negative poles (see Figure 3 ) is abnormal can be determined by detecting the voltage drop U3 between the outer end of the first positive relay K11 and the negative pole of the battery BAT-; whether the connection of the positive pole of the double charging socket (see Figure 5 ) is abnormal can be determined by detecting the voltage drop U5 between the outer end of the second positive relay K21 and the negative pole of the battery BAT-.

[0091] If the second charging socket 120 has the charging gun 200 inserted, the above description can be referred to, and thus will not be repeated here.

[0092] In some embodiments, the step S120 of determining whether the connection of the double charging socket is abnormal according to the voltage parameter comprises:

[0093] Comparing the voltage drop with the battery voltage, and determining whether the connection of the double charging socket is abnormal according to the comparison result.

[0094] Since the connection of the double charging socket is erroneous, for example, the first charging socket 110 has the charging gun 200 inserted, which will cause the second charging socket 120 to be electrified. Therefore, the voltage of the second charging socket 120 to ground (the negative pole of the battery BAT- or the charging gun 200) can be measured, compared with the battery voltage, and the relationship between the two can be used to determine whether the second charging socket 120 is at the charging voltage U1. In addition, since the battery voltage is easy to obtain during the charging process, this determination strategy is simple and reliable.

[0095] In some embodiments, please refer to Figure 7 , Figure 7 The flowchart of the charging diagnosis method provided by some embodiments of the present application is shown in Figures 2 to 5 . The step S120 of comparing the voltage parameter with the battery voltage, and determining whether the connection of the double charging socket is abnormal according to the comparison result comprises:

[0096] The step S122 of calculating the difference between the voltage drop and the battery voltage;

[0097] The step S124 of determining that the connection of the double charging socket is abnormal if the difference is lower than the voltage difference threshold.

[0098] Generally, in the large current DC charging mode, the charging voltage U1 is in the range of 101% to 120% of the battery voltage, and exemplarily in the range of 101% to 105% of the battery voltage. Therefore, the voltage difference threshold can be set to 5% of the battery voltage. In this way, if the un-plugged charging socket (such as the second charging socket 120) is live, that is, has a voltage drop to ground lower than 5% of the battery voltage, it is considered that the wiring of the double charging socket is incorrect.

[0099] In some embodiments, referring to Figure 8 , Figure 8 The flowchart of the charging diagnosis method provided for some embodiments of the application is shown in Figures 2 to 5 . Step S120: after determining whether the wiring of the double charging socket is abnormal according to the voltage parameter, the method further comprises:

[0100] Step S130: if the wiring of the double charging socket is abnormal, sending a stop charging instruction to the charging pile.

[0101] After determining that the wiring of the double charging socket is abnormal, in order to ensure the safety of electricity and equipment, a stop charging instruction is sent to the charging pile to stop outputting charging power (i.e. charging current and charging voltage).

[0102] In some embodiments, referring to Figure 8 , please also refer to Figures 2 to 5 . Step S120: after determining whether the wiring of the double charging socket is abnormal according to the voltage parameter, the method further comprises:

[0103] Step S140: if the wiring of the double charging socket is abnormal, reporting to the equipment where the double charging socket is located that the wiring of the double charging socket is abnormal.

[0104] After determining that the wiring of the double charging socket is abnormal, in order to ensure the safety of the equipment, the user is reminded to maintain the wiring of the double charging socket of the equipment. The equipment where the double charging socket is located is, for example, a vehicle, and the abnormal fault will be reported to the VCU (Vehicle Control Unit, Vehicle Control Unit). The VCU will control the instrument panel to display that the wiring of the charging socket is abnormal, so as to prompt the user to check in time.

[0105] In some embodiments, referring to Figure 8 , please also refer to Figures 2 to 5 . Step S120: after determining whether the wiring of the double charging socket is abnormal according to the voltage parameter, the method further comprises:

[0106] Step S150: if the wiring of the double charging socket is abnormal, controlling both charging loops of the double charging socket to be disconnected.

[0107] In the case of abnormal wiring of the dual charging socket, in order to ensure the safety of the user and the equipment, the BMS will immediately control the charging circuit of the dual charging socket to be disconnected to ensure the safety of the equipment and the user.

[0108] In some embodiments, please refer to Figure 9 , Figure 9 The flowchart of the charging diagnosis method provided by some embodiments of the present application is shown in FIG. 10, which is described in combination with Figures 2 to 5 Before step S110, and in the case of one of the charging sockets being plugged into the charging gun, the following steps are included:

[0109] Step S112: closing the charging circuit of the charging socket corresponding to the charging connection signal in response to the charging connection signal sent by the charging pile;

[0110] Step S114: sending a BCL message to the charging pile in response to the CRO message sent by the charging pile;

[0111] Step S116: entering the charging process.

[0112] The CRO message is a charging pile output ready message, and the BCL message is a battery charging demand message including the charging voltage and the charging current.

[0113] After the charging gun 200 is inserted, the BMS 100 is woken up after detecting a wake-up source (such as a rising edge or a fixed level from the signal detection lines CC2_1 and CC2_2), and the controller (such as the VCU) of the equipment and the charging pile perform charging communication interaction. The BMS 100 will close the first positive electrode relay K11 and the first negative electrode relay K12 of the charging circuit of the first charging socket 110 according to the valid charging connection signal, such as the charging connection signal from the signal detection line CC2_1, thereby closing the charging circuit, and after the charging voltage and the current are matched, the charging pile outputs the corresponding charging power to the charging socket, which conforms to the general charging standard.

[0114] It can be understood that if the wiring of the dual charging socket is abnormal, the charging power connected to the first charging socket 110 may be connected to the charging circuit of the second charging socket 120 from the positive electrode and / or the negative electrode, so that the charging process entered in step S116 is an invalid charging state without current.

[0115] In some embodiments, step S112: closing the charging circuit of the charging socket corresponding to the charging connection signal in response to the charging connection signal sent by the charging pile, includes:

[0116] When the charging gun 200 is inserted, first: in response to the valid charging connection signal (CC2_1 or CC2_2) sent by the charging pile, the national standard charging handshake and parameter configuration interaction is carried out with the charging pile.

[0117] Then, the charging loop of the charging socket corresponding to the valid charging connection signal is closed. For example, the valid charging connection signal from the signal detection line CC2_2, the second positive electrode relay K21 and the second negative electrode relay K22 of the charging loop of the second charging socket 120 are closed. Thereafter, step S114 is entered.

[0118] Secondly, referring to Figure 10 , Figure 10 The schematic diagram of the charging diagnosis device provided for some embodiments of the application, the charging diagnosis device 10 provided by the embodiments of the application comprises:

[0119] The detection module 101 is configured to detect the voltage parameter of the charging loop of one charging socket of the double charging socket when the charging gun is inserted into the charging socket.

[0120] The judgment module 102 is configured to determine whether the wiring is abnormal according to the voltage parameter.

[0121] When charging the device with a double charging socket, when one of the charging sockets starts to receive the charging power input by the charging gun 200, the detection module 101 detects the voltage parameter of the other charging loop at the same time. At this time, if the wiring of the double charging socket is wrong, it will cause the other charging socket to be abnormally charged, so the judgment module 102 can determine whether the wiring of the double charging socket is abnormal according to the voltage parameter of the charging loop of the other charging socket at this time. The scheme is simple and reliable, and can solve the problem that the charging loop line of the double-gun charging vehicle is connected incorrectly, and the un-plugged charging port is charged when single-gun charging.

[0122] Thirdly, the application provides a BMS, which comprises a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements the steps of the charging diagnosis method as described above.

[0123] Fourthly, the application provides a vehicle, which comprises a battery, a double charging socket, and a BMS as described above.

[0124] When charging a vehicle with double charging sockets, the voltage parameter of the other charging circuit is detected at the same time when one of the charging sockets starts receiving charging power input by the charging gun, at this time, if there is an error in the wiring of the double charging sockets, it will cause the other charging socket to be abnormally electrified, therefore, whether the wiring of the double charging socket is abnormal can be determined according to the voltage parameter of the charging circuit of the other charging socket at this time, the scheme is simple and reliable, and can solve the problem that the charging circuit line of the vehicle with double gun charging is connected in error, and the charging port that does not plug in the charging gun is electrified when single gun charging.

[0125] Please refer to Figure 11 , Figure 11 is a schematic diagram of a BMS provided by an embodiment of the present application. The BMS 100 includes a processor 12, a memory 13, and a computer program 14 stored in the memory 13 and executable on the processor 12. The processor 12 implements the steps in each of the charging diagnosis method embodiments described above when executing the computer program 14, such as the steps S110-S120 shown in Figure 1 . Alternatively, the processor 12 implements the functions of each module / unit in the charging diagnosis device 10 embodiment described above when executing the computer program 14, such as the functions of the detection module 101 and the determination module 102 shown in Figure 10 .

[0126] For example, the computer program 14 can be divided into one or more modules / units, one or more modules / units are stored in the memory 13 and executed by the processor 12 to complete the present application. One or more modules / units can be a series of computer program instruction segments capable of completing a specific function, which is used to describe the execution process of the computer program 14 in the BMS 100. For example, the computer program 14 can be divided into the detection module 101 and the determination module 102.

[0127] The processor 12 mentioned can be a VCU, an Electronic Control Unit (ECU), a Central Processing Unit (CPU) in the BMS 100 or a vehicle, and can also be other general-purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field-Programmable Gate Arrays (FPGAs) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor.

[0128] The memory 13 can be an internal storage unit of the BMS 100 or the vehicle, such as a hard disk or a memory of the BMS 100. The memory 13 can also be an external storage device of the BMS 100 or the vehicle, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) card, a Flash Card, etc. equipped on the BMS 100 or the vehicle. Further, the memory 13 can also include both the internal storage unit and the external storage device of the BMS 100 or the vehicle. The memory 13 is used to store computer programs and other programs and data required by the device / terminal. The memory 13 can also be used to temporarily store data that has been output or will be output.

[0129] In the above embodiments, the description of each embodiment has its own focus, and the parts not described or recorded in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0130] Those skilled in the art can appreciate that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be realized by electronic hardware or a combination of computer software and electronic hardware. Whether the functions are realized in hardware or software depends on the specific application and design constraints of the technical solution. A person skilled in the art can use different methods to realize the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0131] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A charging diagnosis method characterized by, The method comprises the following steps: In the case that one charging socket of a double charging socket is plugged with a charging gun, detecting a voltage parameter of a charging loop of the other charging socket of the double charging socket; Determining whether the wiring of the double charging socket is incorrect according to the voltage parameter; The detection of the voltage parameter of the charging loop of the other charging socket of the double charging socket comprises: Detecting a voltage drop between the outer ends of the positive and negative relays in the charging loop of the other charging socket of the double charging socket; The determination of whether the wiring of the double charging socket is incorrect according to the voltage parameter comprises: Calculating the difference between the voltage drop and the battery voltage; If the difference is lower than a voltage difference threshold, it is determined that the wiring of the double charging socket is incorrect.

2. The charge diagnosis method of claim 1, wherein, The detection of the voltage parameter of the charging loop of the other charging socket of the double charging socket can also be: Detecting a voltage drop between the outer end of the positive relay and the negative electrode of the battery in the charging loop of the other charging socket of the double charging socket.

3. The charge diagnosis method of claim 1, wherein, After the determination of whether the wiring of the double charging socket is abnormal according to the voltage parameter, the method further comprises: If the wiring of the double charging socket is abnormal, sending a stop charging instruction to the charging pile.

4. The charge diagnosis method of claim 1 or 3, wherein, After the determination of whether the wiring of the double charging socket is abnormal according to the voltage parameter, the method further comprises: If the wiring of the double charging socket is abnormal, reporting on the device where the double charging socket is located that the wiring of the double charging socket is abnormal.

5. The charge diagnosis method of claim 1 or 3, wherein, After the determination of whether the wiring of the double charging socket is abnormal according to the voltage parameter, the method further comprises: If the wiring of the double charging socket is abnormal, controlling both charging loops of the double charging socket to be disconnected.

6. The charge diagnosis method of claim 1, wherein, Before the detection of the voltage parameter of the charging loop of the other charging socket of the double charging socket in the case that one charging socket of the double charging socket is plugged with a charging gun, the method comprises the following steps: In response to a charging connection signal sent by a charging pile, closing the charging loop of the charging socket corresponding to the charging connection signal; In response to a CRO packet sent by the charging pile, sending a BCL packet to the charging pile; Entering a charging process.

7. The charge diagnosis method of claim 6, wherein, The closing of the charging loop of the charging socket corresponding to the charging connection signal sent by the charging pile comprises the following steps: When the charging gun is plugged in, in response to a valid charging connection signal sent by the charging pile, performing a national standard charging handshake and parameter configuration interaction with the charging pile; Closing the charging loop of the charging socket corresponding to the valid charging connection signal.

8. A charging diagnosis device characterized by comprising: The method comprises the following steps: A detection module is configured to detect a voltage parameter of a charging loop of the other charging socket of the double charging socket in the case that one charging socket of a double charging socket is plugged with a charging gun; The detection of the voltage parameter of the charging loop of the other charging socket of the double charging socket comprises: Detecting a voltage drop between the outer ends of the positive and negative relays in the charging loop of the other charging socket of the double charging socket, or detecting a voltage drop between the outer end of the positive relay and the negative electrode of the battery in the charging loop of the other charging socket of the double charging socket; a judging module configured to determine whether the wiring of the dual charging socket is connected in error according to the voltage parameter, wherein the determination of whether the wiring of the dual charging socket is connected in error according to the voltage parameter comprises: calculating a difference between the voltage drop and the battery voltage; if the difference is lower than a voltage difference threshold, determining that the wiring of the dual charging socket is connected in error.

9. A battery management system, characterized by, A battery management system comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the charging diagnosis method of the dual charging socket according to any one of claims 1 to 7 when executing the computer program.

10. A vehicle comprising a battery and a dual charging socket, characterized in that, The battery management system according to claim 9 is also included.

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