Pure electric vehicle battery fuse ablation detection control method, device and equipment

Abstract

The present invention discloses a method, device, and equipment for detecting and controlling battery fuse burnout in pure electric vehicles, relating to the field of intelligent vehicle control technology. The method comprises obtaining the vehicle status and, when the vehicle is in the ON gear and charging, waking up the DC-DC converter based on the vehicle controller and driving the DC-DC converter to operate. The method then detects and determines DCDC converter faults and battery positive electrode fuse burnout faults based on the voltage difference between the DCDC converter output voltage and the actual operating voltage of the low-voltage battery. This application enables timely detection of DCDC converter faults and battery positive electrode fuse burnout faults.

Description

Technical Field

[0001] The present application relates to the field of vehicle intelligent control technology, and in particular to a method, device and equipment for detecting and controlling battery fuse ablation of a pure electric vehicle. Background Art

[0002] Currently, with the rapid development of the pure electric vehicle market, pure electric vehicles are gaining an increasing market share. The DC-DC converter (DC-DC converter) in pure electric vehicles is used to convert high-voltage electricity into 12V low-voltage electricity to power the 12V low-voltage battery, and in turn, the vehicle's low-voltage electrical appliances. The vehicle's low-voltage electrical appliances are all connected in series to the low-voltage battery. When different low-voltage appliances are turned on, the corresponding load conditions will vary, affecting the output power of the DC-DC converter. Since the low-voltage battery voltage is constant, the output current will be affected by fluctuations. Although the DC-DC converter limits the output power, there are still reports of fuse burnout in the battery's positive terminal fuse box.

[0003] When the battery's positive terminal fuse box burns out, the DC-DC converter loses power to the 12V low-voltage battery, causing the vehicle's low-voltage system to rely on the 12V battery itself for maintenance. When the low-voltage battery voltage drops below a certain value, the vehicle's low-voltage electrical appliances go dormant due to insufficient power, causing driving or charging failures and endangering vehicle safety. Therefore, how to detect and control battery fuse burnout has become a pressing issue. Summary of the Invention

[0004] The present application provides a method, device and equipment for detecting and controlling battery fuse ablation of a pure electric vehicle, which can promptly detect DCDC converter failures and battery positive electrode fuse ablation failures.

[0005] In a first aspect, an embodiment of the present application provides a method for detecting and controlling battery fuse ablation of a pure electric vehicle, the method comprising:

[0006] Obtain the vehicle status and, when the vehicle is in the ON gear and charging is in progress, wake up the DCDC converter based on the vehicle controller and drive the DCDC converter to work;

[0007] Based on the voltage difference between the output voltage of the DCDC converter and the actual working voltage of the low-voltage battery, the DCDC converter fault and the battery positive electrode fuse burnout fault are detected and judged.

[0008] In combination with the first aspect, in one embodiment, obtaining the vehicle state and, when the vehicle is in the ON gear and performing a charging operation, waking up the DCDC converter based on the vehicle controller and driving the DCDC converter to operate specifically includes:

[0009] The vehicle status is obtained, and when the vehicle key is in the ON position and the vehicle is performing slow charging or fast charging, the DCDC converter is woken up based on the vehicle controller and driven to work.

[0010] In combination with the first aspect, in one embodiment, when the vehicle key is in the ON position and the vehicle is performing a slow charging operation, waking up the DCDC converter based on the vehicle controller and driving the DCDC converter to work specifically includes:

[0011] The vehicle controller is woken up through the OBC. The vehicle controller performs a self-test and, when the self-test passes, sends an enable signal and a working instruction to the DCDC converter through the CAN signal to wake up the DCDC converter.

[0012] Wake up the DCDC converter to perform self-test and determine whether the self-test passes:

[0013] If so, the DCDC converter starts working;

[0014] If not, the DCDC converter shuts down and reports a fault.

[0015] In combination with the first aspect, in one embodiment, when the vehicle key is in the ON position and the vehicle is fast charging, waking up the DCDC converter based on the vehicle controller and driving the DCDC converter to work specifically includes:

[0016] The vehicle controller is woken up by the BMS. The vehicle controller performs a self-test and, when the self-test passes, sends an enable signal and a working instruction to the DCDC converter via the CAN signal to wake up the DCDC converter.

[0017] Wake up the DCDC converter to perform self-test and determine whether the self-test passes:

[0018] If so, the DCDC converter starts working;

[0019] If not, the DCDC converter shuts down and reports a fault.

[0020] In combination with the first aspect, in one embodiment, the detection and judgment of a DCDC converter fault and a battery positive electrode fuse ablation fault based on the voltage difference between the DCDC converter output terminal voltage and the actual operating voltage of the low-voltage battery specifically includes:

[0021] Periodically obtain the DCDC converter output voltage and the actual low-voltage battery operating voltage, calculate the voltage difference between the DCDC converter output voltage and the actual low-voltage battery operating voltage, and determine:

[0022] If the voltage difference is less than the set voltage value and the current output current of the DCDC converter does not exceed the set maximum output current threshold, the current value corresponding to the current voltage difference is obtained by looking up the table, and the smaller value between the current value obtained from the table and the set maximum output current threshold is selected to limit the output current of the DCDC converter;

[0023] If the voltage difference is not less than the set voltage value and lasts for the set time, and the current output current of the DCDC converter does not exceed the set maximum output current threshold, it is determined that the battery positive electrode fuse is burned out;

[0024] If the voltage difference is not less than the set voltage value and lasts for the set time, and the current output current of the DCDC converter exceeds the set maximum output current threshold, the DCDC converter is determined to be faulty.

[0025] In combination with the first aspect, in one embodiment, the logic circuit corresponding to the pure electric vehicle battery fuse ablation detection and control method includes a power battery pack, a DCDC converter, a battery positive electrode fuse, a low-voltage battery, a vehicle controller, a high-voltage distribution box, an on-board charger, an AC charging interface, and a DC charging interface.

[0026] In conjunction with the first aspect, in one embodiment,

[0027] The power battery pack is provided with a main negative relay, which is connected to the negative electrode of the power battery pack, the negative electrode of the power battery pack is connected to the main negative terminal of the high-voltage distribution box, and the main negative terminal of the high-voltage distribution box is connected to the negative input terminal of the DCDC converter;

[0028] The positive electrode of the power battery pack is connected to the positive input terminal of the DCDC converter through the main positive copper busbar and DCDC fuse of the high-voltage distribution box in sequence;

[0029] The vehicle controller is connected to the BMS, high-voltage distribution box, DCDC converter and on-board charger inside the power battery pack via a CAN line;

[0030] The positive electrode of the DCDC converter is connected to the positive electrode of the low-voltage battery through the battery positive electrode fuse;

[0031] The negative electrode of the DCDC converter is connected to the negative electrode of the low-voltage battery;

[0032] The positive electrode of the low-voltage battery is connected in parallel with the positive electrode of the on-board low-voltage device;

[0033] The negative electrode of the low-voltage battery is connected in parallel with the negative electrode of the on-board low-voltage device.

[0034] In conjunction with the first aspect, in one embodiment,

[0035] The negative electrode of the AC charging interface is connected to the negative electrode of the on-board charger, the negative electrode of the on-board charger is connected to the main negative terminal of the high-voltage distribution box, and the main negative terminal of the high-voltage distribution box is connected to the negative electrode of the power battery pack;

[0036] The positive pole of the AC charging interface is connected to the positive pole of the on-board charger. The positive pole of the on-board charger, the AC relay in the high-voltage distribution box, and the AC charging fuse in the high-voltage distribution box are all connected to the positive pole of the high-voltage distribution box. The positive pole of the high-voltage distribution box is connected to the positive pole of the power battery pack.

[0037] The negative electrode of the DC charging interface is connected to the main negative terminal of the high-voltage distribution box, and the main negative terminal of the high-voltage distribution box is connected to the negative electrode of the power battery pack;

[0038] The positive pole of the DC charging interface, the DC relay in the high-voltage distribution box, and the DC fuse in the high-voltage distribution box are all connected to the positive pole of the high-voltage distribution box, and the positive pole of the high-voltage distribution box is connected to the positive pole of the power battery pack.

[0039] In a second aspect, an embodiment of the present application provides a pure electric vehicle battery fuse ablation detection and control device, the pure electric vehicle battery fuse ablation detection and control device comprising:

[0040] An acquisition module is used to acquire the vehicle status and, when the vehicle is in the ON gear and charging is in progress, wake up the DCDC converter based on the vehicle controller and drive the DCDC converter to work;

[0041] The execution module is used to detect and judge the DCDC converter fault and the battery positive electrode fuse ablation fault based on the voltage difference between the DCDC converter output terminal voltage and the actual working voltage of the low-voltage battery.

[0042] In a third aspect, an embodiment of the present application provides a pure electric vehicle battery fuse burnout detection and control device, wherein the pure electric vehicle battery fuse burnout detection and control device includes a processor, a memory, and a pure electric vehicle battery fuse burnout detection and control program stored on the memory and executable by the processor, wherein when the pure electric vehicle battery fuse burnout detection and control program is executed by the processor, the steps of the above-mentioned pure electric vehicle battery fuse burnout detection and control method are implemented.

[0043] The beneficial effects of the technical solutions provided in the embodiments of the present application include:

[0044] The voltage difference between the DCDC converter output voltage and the actual working voltage of the low-voltage battery is used to dynamically check the DCDC converter output current, promptly detect DCDC converter faults and battery positive fuse burnout faults, and issue audible and visual alarms to facilitate timely maintenance and ensure driving safety. The system has simple logic, high feasibility, reliable implementation, and high practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 This is a flow chart of the method for detecting and controlling battery fuse ablation of a pure electric vehicle according to the present application;

[0046] Figure 2 This is the logic circuit diagram corresponding to the pure electric vehicle battery fuse ablation detection and control method of this application;

[0047] Figure 3 This is a functional module diagram of the pure electric vehicle battery fuse ablation detection and control device of this application;

[0048] Figure 4 This is a hardware structure diagram of the pure electric vehicle battery fuse ablation detection and control device in this application. DETAILED DESCRIPTION

[0049] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 are within the scope of protection of this application.

[0050] In order to make the objectives, technical solutions and advantages of this application clearer, the implementation methods of this application will be further described in detail below with reference to the accompanying drawings.

[0051] In the first aspect, an embodiment of the present application provides a pure electric vehicle battery fuse ablation detection and control method. Based on the voltage difference between the output voltage of the DCDC converter and the actual working voltage of the low-voltage battery, the DCDC converter output current is dynamically calibrated, abnormal battery voltage drops are detected in time, and an audible and visual alarm is issued in time so that maintenance can be carried out in time to ensure driving safety.

[0052] In one embodiment, referring to Figure 1 , Figure 1 This is a flow chart of the method for detecting and controlling battery fuse ablation of a pure electric vehicle. Figure 1 As shown, the pure electric vehicle battery fuse ablation detection and control method includes:

[0053] S1: Obtain the vehicle status, and when the vehicle is in the ON gear and charging is in progress, wake up the DCDC converter based on the vehicle controller and drive the DCDC converter to work;

[0054] Furthermore, the vehicle status is obtained, and when the vehicle is in the ON position and charging operation is performed, the DCDC converter is woken up based on the vehicle controller and the DCDC converter is driven to work, specifically including: obtaining the vehicle status, and when the vehicle key is in the ON position and the vehicle is slow charging or fast charging operation, the DCDC converter is woken up based on the vehicle controller and the DCDC converter is driven to work.

[0055] That is, when the vehicle is shifted to the ON gear, the vehicle controller is awakened by a hard-wired signal or a CAN (Controller Area Network) signal. If the vehicle controller self-checks and there are no faults, it sends an enable signal and a working instruction to the DCDC converter via the CAN signal to wake up the DCDC converter. If there are no problems in the self-check, the DCDC converter starts working. If there are any problems, it stops and reports the fault.

[0056] Specifically, when the vehicle key is in the ON position and the vehicle is performing a slow charging operation, the vehicle controller wakes up the DCDC converter and drives the DCDC converter to work, specifically including:

[0057] S101: The vehicle controller is awakened by the on-board charger (OBC). The vehicle controller performs a self-test and, if it passes, sends an enable signal and a working instruction to the DCDC converter via the CAN signal to wake up the DCDC converter.

[0058] S102: Wake up the DCDC converter to perform self-test and determine whether the self-test passes:

[0059] If so, the DCDC converter starts working;

[0060] If not, the DCDC converter shuts down and reports a fault.

[0061] Specifically, when the vehicle key is in the ON position and the vehicle is fast charging, the vehicle controller wakes up the DCDC converter and drives the DCDC converter to work, specifically including:

[0062] S111: The vehicle controller is woken up by the BMS (Battery Management System). The vehicle controller performs a self-test and, if it passes, sends an enable signal and a working instruction to the DCDC converter via the CAN signal to wake up the DCDC converter.

[0063] S112: Wake up the DCDC converter to perform self-test and determine whether the self-test passes:

[0064] If so, the DCDC converter starts working;

[0065] If not, the DCDC converter shuts down and reports a fault.

[0066] It should be noted that when the vehicle key is in the OFF position and slow charging or fast charging is performed, the DCDC converter does not work.

[0067] S2: Based on the voltage difference between the output voltage of the DCDC converter and the actual working voltage of the low-voltage battery, a DCDC converter fault and a battery positive electrode fuse burnout fault are detected and determined.

[0068] Furthermore, in one embodiment, based on the voltage difference between the output voltage of the DCDC converter and the actual operating voltage of the low-voltage battery, detection and judgment of a DCDC converter failure and a battery positive electrode fuse burnout failure are performed, specifically including:

[0069] Periodically obtain the DCDC converter output voltage and the actual low-voltage battery operating voltage, calculate the voltage difference between the DCDC converter output voltage and the actual low-voltage battery operating voltage, and determine:

[0070] If the voltage difference is less than the set voltage value and the current output current of the DCDC converter does not exceed the set maximum output current threshold, the current value corresponding to the current voltage difference is obtained by looking up the table, and the smaller value between the current value obtained from the table and the set maximum output current threshold is selected to limit the output current of the DCDC converter;

[0071] If the voltage difference is not less than the set voltage value and lasts for the set time, and the current output current of the DCDC converter does not exceed the set maximum output current threshold, it is determined that the battery positive electrode fuse is burned out;

[0072] If the voltage difference is not less than the set voltage value and lasts for the set time, and the current output current of the DCDC converter exceeds the set maximum output current threshold, the DCDC converter is determined to be faulty.

[0073] Specifically, the DCDC converter output voltage U0 and the actual operating voltage UX of the low-voltage battery are obtained every 50 ms, and then the voltage difference between the DCDC converter output voltage and the actual operating voltage of the low-voltage battery is calculated, that is, △U = U0-UX, where the obtained DCDC converter output voltage is the output voltage value set by the DCDC converter, and the actual operating voltage of the low-voltage battery is the actual measured voltage of the low-voltage battery after the DCDC converter is in operation, which is monitored by the DCDC converter.

[0074] Under normal circumstances, when ΔU is less than 1V and the current output current of the DCDC converter does not exceed the set maximum output current threshold of the DCDC converter, a table is used to obtain the current value corresponding to the current voltage difference. The smaller value between the current value obtained from the table and the set maximum output current threshold is selected to limit the output current of the DCDC converter. This ensures that the output current of the DCDC converter does not exceed the smaller value between the current value obtained from the table and the set maximum output current threshold. This prevents excessive power demand from low-voltage electrical appliances in the back-end and ensures that power is supplied according to the actual power demand of low-voltage electrical appliances. Based on work experience, the current values ​​corresponding to each voltage difference are set in advance and recorded in a table. The pre-set current values ​​ensure the normal operation of each component.

[0075] When △U ≥ 1V is detected for more than 15s and the current output current of the DCDC converter does not exceed the set maximum output current threshold, it is determined that the battery positive electrode fuse is burned out, the instrument reports the fault, and an audible and visual alarm is sounded at the same time, urging the customer to go to the service station to repair the vehicle as soon as possible.

[0076] When △U ≥ 1V is detected for more than 15 seconds and the current output current of the DCDC converter exceeds the set maximum output current threshold, the DCDC converter is judged to have an internal fault, the instrument reports the fault, and simultaneously sounds an audible and visual alarm to encourage customers to go to the service station to repair the vehicle as soon as possible.

[0077] For further information, see Figure 2 As shown, the logic circuit corresponding to the pure electric vehicle battery fuse ablation detection and control method of the present application includes a power battery pack, a DCDC converter, a battery positive electrode fuse, a low-voltage battery, a vehicle controller, a high-voltage distribution box, an on-board charger, an AC charging interface, and a DC charging interface.

[0078] A main negative relay is provided in the power battery pack, which is connected to the negative pole of the power battery pack. The negative pole of the power battery pack is connected to the main negative terminal of the high-voltage distribution box, and the main negative terminal of the high-voltage distribution box is connected to the negative input terminal of the DCDC converter; the positive pole of the power battery pack is connected to the positive input terminal of the DCDC converter through the main positive copper bus of the high-voltage distribution box and the DCDC fuse in turn; the vehicle controller is connected to the BMS inside the power battery pack, the high-voltage distribution box, the DCDC converter and the on-board charger through the CAN line; the positive pole of the DCDC converter is connected to the positive pole of the low-voltage battery through the battery positive fuse; the negative pole of the DCDC converter is connected to the negative pole of the low-voltage battery; the positive pole of the low-voltage battery is connected in parallel with the positive pole of the on-board low-voltage equipment; the negative pole of the low-voltage battery is connected in parallel with the negative pole of the on-board low-voltage equipment.

[0079] The negative pole of the AC charging interface is connected to the negative pole of the on-board charger, the negative pole of the on-board charger is connected to the main negative terminal of the high-voltage distribution box, and the main negative terminal of the high-voltage distribution box is connected to the negative pole of the power battery pack; the positive pole of the AC charging interface is connected to the positive pole of the on-board charger, the positive pole of the on-board charger, the AC relay in the high-voltage distribution box, and the AC charging fuse in the high-voltage distribution box are all connected to the positive pole of the high-voltage distribution box, and the positive pole of the high-voltage distribution box is connected to the positive pole of the power battery pack; the negative pole of the DC charging interface is connected to the main negative terminal of the high-voltage distribution box, and the main negative terminal of the high-voltage distribution box is connected to the negative pole of the power battery pack; the positive pole of the DC charging interface, the DC relay in the high-voltage distribution box, and the DC fuse in the high-voltage distribution box are all connected to the positive pole of the high-voltage distribution box, and the positive pole of the high-voltage distribution box is connected to the positive pole of the power battery pack.

[0080] The pure electric vehicle battery fuse burnout detection and control method of the embodiment of the present application dynamically calibrates the DCDC converter output current by measuring the voltage difference between the DCDC converter output voltage and the actual operating voltage of the low-voltage battery, promptly detects DCDC converter faults and battery positive electrode fuse burnout faults, and issues an audible and visual alarm to facilitate timely repair and ensure driving safety. The method has simple logic, high feasibility, reliable implementation, and high practicality.

[0081] In a second aspect, an embodiment of the present application also provides a battery fuse ablation detection and control device for a pure electric vehicle.

[0082] In one embodiment, referring to Figure 3 , Figure 3 This is a functional module diagram of the battery fuse ablation detection and control device for pure electric vehicles in this application. Figure 3 As shown, the pure electric vehicle battery fuse ablation detection and control device includes: an acquisition module and an execution module.

[0083] The acquisition module is used to obtain the vehicle status, and when the vehicle is in the ON gear and charging operation, it wakes up the DCDC converter based on the vehicle controller and drives the DCDC converter to work; the execution module is used to detect and judge the DCDC converter fault and battery positive electrode fuse ablation fault based on the voltage difference between the output voltage of the DCDC converter and the actual working voltage of the low-voltage battery.

[0084] In this application, the vehicle status is obtained, and when the vehicle is in the ON gear and charging is performed, the DCDC converter is awakened based on the vehicle controller and driven to work, specifically including:

[0085] The vehicle status is obtained, and when the vehicle key is in the ON position and the vehicle is performing slow charging or fast charging, the DCDC converter is woken up based on the vehicle controller and driven to work.

[0086] In this application, when the vehicle key is in the ON position and the vehicle is performing a slow charging operation, the vehicle controller wakes up the DCDC converter and drives the DCDC converter to work, specifically including:

[0087] The vehicle controller is woken up through the OBC. The vehicle controller performs a self-test and, when the self-test passes, sends an enable signal and a working instruction to the DCDC converter through the CAN signal to wake up the DCDC converter.

[0088] Wake up the DCDC converter to perform self-test and determine whether the self-test passes:

[0089] If so, the DCDC converter starts working;

[0090] If not, the DCDC converter shuts down and reports a fault.

[0091] In this application, when the vehicle key is in the ON position and the vehicle is fast charging, the vehicle controller wakes up the DCDC converter and drives the DCDC converter to work, specifically including:

[0092] The vehicle controller is woken up by the BMS. The vehicle controller performs a self-test and, when the self-test passes, sends an enable signal and a working instruction to the DCDC converter via the CAN signal to wake up the DCDC converter.

[0093] Wake up the DCDC converter to perform self-test and determine whether the self-test passes:

[0094] If so, the DCDC converter starts working;

[0095] If not, the DCDC converter shuts down and reports a fault.

[0096] In this application, based on the voltage difference between the output voltage of the DCDC converter and the actual operating voltage of the low-voltage battery, the detection and judgment of the DCDC converter failure and the battery positive electrode fuse burnout failure are carried out, specifically including:

[0097] Periodically obtain the DCDC converter output voltage and the actual low-voltage battery operating voltage, calculate the voltage difference between the DCDC converter output voltage and the actual low-voltage battery operating voltage, and determine:

[0098] If the voltage difference is less than the set voltage value and the current output current of the DCDC converter does not exceed the set maximum output current threshold, the current value corresponding to the current voltage difference is obtained by looking up the table, and the smaller value between the current value obtained from the table and the set maximum output current threshold is selected to limit the output current of the DCDC converter;

[0099] If the voltage difference is not less than the set voltage value and lasts for the set time, and the current output current of the DCDC converter does not exceed the set maximum output current threshold, it is determined that the battery positive electrode fuse is burned out;

[0100] If the voltage difference is not less than the set voltage value and lasts for the set time, and the current output current of the DCDC converter exceeds the set maximum output current threshold, the DCDC converter is determined to be faulty.

[0101] Among them, the functional implementation of each module in the above-mentioned pure electric vehicle battery fuse ablation detection and control device corresponds to the various steps in the above-mentioned pure electric vehicle battery fuse ablation detection and control method embodiment, and their functions and implementation processes will not be repeated here one by one.

[0102] In a third aspect, an embodiment of the present application provides a pure electric vehicle battery fuse ablation detection and control device, which can be a personal computer (PC), laptop computer, server, or other device with data processing capabilities.

[0103] Reference Figure 4 , Figure 4 The hardware structure diagram of the pure electric vehicle battery fuse burnout detection and control device involved in the embodiment of the present application is shown in FIG. In the embodiment of the present application, the pure electric vehicle battery fuse burnout detection and control device may include a processor, a memory, a communication interface, and a communication bus.

[0104] The communication bus may be of any type and is used to interconnect the processor, memory, and communication interface.

[0105] Communication interfaces include input / output (I / O), physical, and logical interfaces, used to interconnect components within the pure electric vehicle battery fuse burnout detection and control device, as well as interfaces used to interconnect the pure electric vehicle battery fuse burnout detection and control device with other devices (such as other computing devices or user devices). Physical interfaces can be Ethernet, fiber optic, or ATM interfaces; user devices can be displays, keyboards, and other devices.

[0106] The memory can be various types of storage media, such as random access memory (RAM), read-only memory (ROM), non-volatile RAM (NVRAM), flash memory, optical storage, hard disk, programmable ROM (PROM), erasable PROM (EPROM), electrically erasable PROM (EEPROM), etc.

[0107] The processor may be a general-purpose processor that can invoke a pure electric vehicle battery fuse burnout detection control program stored in memory and execute the pure electric vehicle battery fuse burnout detection control method provided in the embodiments of the present application. For example, the general-purpose processor may be a central processing unit (CPU). The methods executed when the pure electric vehicle battery fuse burnout detection control program is invoked can be referenced to the various embodiments of the pure electric vehicle battery fuse burnout detection control method of the present application and will not be further described here.

[0108] Those skilled in the art will understand that Figure 4 The hardware structure shown in the figure does not constitute a limitation to the present application and may include more or fewer components than shown in the figure, or a combination of certain components, or a different arrangement of components.

[0109] It should be noted that the serial numbers of the above-mentioned embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0110] The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings 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 limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices. The terms "first", "second" and "third" are used to distinguish different objects, etc., and do not represent a sequence, nor do they limit the "first", "second" and "third" to different types.

[0111] In the description of the embodiments of this application, the words "exemplary," "for example," or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary," "for example," or "for example" in the embodiments of this application should not be construed as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary," "for example," or "for example" is intended to present the relevant concepts in a concrete manner.

[0112] In the description of the embodiments of the present application, unless otherwise specified, “ / ” means or, for example, A / B can mean A or B; “and / or” in the text is merely a description of the association relationship of associated objects, indicating that three relationships may exist, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, “multiple” refers to two or more than two.

[0113] In some processes described in the embodiments of the present application, multiple operations or steps are included that appear in a specific order. However, it should be understood that these operations or steps may not be performed in the order in which they appear in the embodiments of the present application or may be performed in parallel. The sequence numbers of the operations are only used to distinguish between different operations, and the sequence numbers themselves do not represent any order of execution. In addition, these processes may include more or fewer operations, and these operations or steps may be performed in sequence or in parallel, and these operations or steps may be combined.

[0114] Through the description of the above embodiments, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus the necessary general hardware platform. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, or the part that contributes to the existing technology, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above and includes a number of instructions for enabling a terminal device to execute the methods described in each embodiment of this application.

[0115] The above are only preferred embodiments of the present application and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A pure electric vehicle battery fuse ablation detection and control method, characterized in that: The pure electric vehicle battery fuse ablation detection and control method comprises: Obtain the vehicle status and, when the vehicle is in the ON gear and charging is in progress, wake up the DCDC converter based on the vehicle controller and drive the DCDC converter to work; Based on the voltage difference between the DCDC converter output voltage and the actual working voltage of the low-voltage battery, the DCDC converter fault and the battery positive electrode fuse burnout fault are detected and judged; The detection and judgment of the DCDC converter fault and the battery positive electrode fuse ablation fault based on the voltage difference between the DCDC converter output voltage and the actual working voltage of the low-voltage battery specifically includes: Periodically obtain the DCDC converter output voltage and the actual low-voltage battery operating voltage, calculate the voltage difference between the DCDC converter output voltage and the actual low-voltage battery operating voltage, and determine: If the voltage difference is less than the set voltage value and the current output current of the DCDC converter does not exceed the set maximum output current threshold, the current value corresponding to the current voltage difference is obtained by looking up the table, and the smaller value between the current value obtained from the table and the set maximum output current threshold is selected to limit the output current of the DCDC converter; If the voltage difference is not less than the set voltage value and lasts for the set time, and the current output current of the DCDC converter does not exceed the set maximum output current threshold, it is determined that the battery positive electrode fuse is burned out; If the voltage difference is not less than the set voltage value and lasts for the set time, and the current output current of the DCDC converter exceeds the set maximum output current threshold, the DCDC converter is determined to be faulty.

2. A pure electric vehicle battery fuse ablation detection and control method as claimed in claim 1, characterized in that: The method of obtaining the vehicle status and waking up the DCDC converter and driving the DCDC converter to operate based on the vehicle controller when the vehicle is in the ON gear and performing the charging operation specifically includes: The vehicle status is obtained, and when the vehicle key is in the ON position and the vehicle is performing slow charging or fast charging, the DCDC converter is woken up based on the vehicle controller and driven to work.

3. A pure electric vehicle battery fuse ablation detection and control method as claimed in claim 2, characterized in that: When the vehicle key is in the ON position and the vehicle is performing a slow charging operation, the vehicle controller wakes up the DCDC converter and drives the DCDC converter to work, specifically including: The vehicle controller is woken up through the OBC. The vehicle controller performs a self-test and, when the self-test passes, sends an enable signal and a working instruction to the DCDC converter through the CAN signal to wake up the DCDC converter. Wake up the DCDC converter to perform self-test and determine whether the self-test passes: If so, the DCDC converter starts working; If not, the DCDC converter shuts down and reports a fault.

4. A pure electric vehicle battery fuse ablation detection and control method as claimed in claim 2, characterized in that: When the vehicle key is in the ON position and the vehicle is fast charging, the vehicle controller wakes up the DCDC converter and drives the DCDC converter to work, specifically including: The vehicle controller is woken up by the BMS. The vehicle controller performs a self-test and, when the self-test passes, sends an enable signal and a working instruction to the DCDC converter via the CAN signal to wake up the DCDC converter. Wake up the DCDC converter to perform self-test and determine whether the self-test passes: If so, the DCDC converter starts working; If not, the DCDC converter shuts down and reports a fault.

5. The method for detecting and controlling battery fuse ablation of a pure electric vehicle according to claim 1, wherein: The logic circuit corresponding to the pure electric vehicle battery fuse ablation detection and control method includes a power battery pack, a DCDC converter, a battery positive electrode fuse, a low-voltage battery, a vehicle controller, a high-voltage distribution box, an on-board charger, an AC charging interface, and a DC charging interface.

6. A pure electric vehicle battery fuse ablation detection and control method as claimed in claim 5, characterized in that: The power battery pack is provided with a main negative relay, which is connected to the negative electrode of the power battery pack, the negative electrode of the power battery pack is connected to the main negative terminal of the high-voltage distribution box, and the main negative terminal of the high-voltage distribution box is connected to the negative input terminal of the DCDC converter; The positive electrode of the power battery pack is connected to the positive input terminal of the DCDC converter through the main positive copper busbar and DCDC fuse of the high-voltage distribution box in sequence; The vehicle controller is connected to the BMS, high-voltage distribution box, DCDC converter and on-board charger inside the power battery pack via a CAN line; The positive electrode of the DCDC converter is connected to the positive electrode of the low-voltage battery through the battery positive electrode fuse; The negative electrode of the DCDC converter is connected to the negative electrode of the low-voltage battery; The positive electrode of the low-voltage battery is connected in parallel with the positive electrode of the on-board low-voltage device; The negative electrode of the low-voltage battery is connected in parallel with the negative electrode of the on-board low-voltage device.

7. A pure electric vehicle battery fuse ablation detection and control method as claimed in claim 6, characterized in that: The negative electrode of the AC charging interface is connected to the negative electrode of the on-board charger, the negative electrode of the on-board charger is connected to the main negative terminal of the high-voltage distribution box, and the main negative terminal of the high-voltage distribution box is connected to the negative electrode of the power battery pack; The positive pole of the AC charging interface is connected to the positive pole of the on-board charger. The positive pole of the on-board charger, the AC relay in the high-voltage distribution box, and the AC charging fuse in the high-voltage distribution box are all connected to the positive pole of the high-voltage distribution box. The positive pole of the high-voltage distribution box is connected to the positive pole of the power battery pack. The negative electrode of the DC charging interface is connected to the main negative terminal of the high-voltage distribution box, and the main negative terminal of the high-voltage distribution box is connected to the negative electrode of the power battery pack; The positive pole of the DC charging interface, the DC relay in the high-voltage distribution box, and the DC fuse in the high-voltage distribution box are all connected to the positive pole of the high-voltage distribution box, and the positive pole of the high-voltage distribution box is connected to the positive pole of the power battery pack.

8. A pure electric vehicle battery fuse ablation detection and control device, characterized in that: The pure electric vehicle battery fuse ablation detection and control device comprises: An acquisition module is used to acquire the vehicle status and, when the vehicle is in the ON gear and charging is in progress, wake up the DCDC converter based on the vehicle controller and drive the DCDC converter to work; An execution module, configured to detect and determine a DCDC converter fault and a battery positive electrode fuse burnout fault based on a voltage difference between a DCDC converter output voltage and an actual operating voltage of the low-voltage battery; The detection and judgment of the DCDC converter fault and the battery positive electrode fuse ablation fault based on the voltage difference between the DCDC converter output voltage and the actual working voltage of the low-voltage battery specifically includes: Periodically obtain the DCDC converter output voltage and the actual low-voltage battery operating voltage, calculate the voltage difference between the DCDC converter output voltage and the actual low-voltage battery operating voltage, and determine: If the voltage difference is less than the set voltage value and the current output current of the DCDC converter does not exceed the set maximum output current threshold, the current value corresponding to the current voltage difference is obtained by looking up the table, and the smaller value between the current value obtained from the table and the set maximum output current threshold is selected to limit the output current of the DCDC converter; If the voltage difference is not less than the set voltage value and lasts for the set time, and the current output current of the DCDC converter does not exceed the set maximum output current threshold, it is determined that the battery positive electrode fuse is burned out; If the voltage difference is not less than the set voltage value and lasts for the set time, and the current output current of the DCDC converter exceeds the set maximum output current threshold, the DCDC converter is determined to be faulty.

9. A pure electric vehicle battery fuse ablation detection and control device, characterized in that: The pure electric vehicle battery fuse burnout detection and control device includes a processor, a memory, and a pure electric vehicle battery fuse burnout detection and control program stored in the memory and executable by the processor. When the pure electric vehicle battery fuse burnout detection and control program is executed by the processor, the steps of the pure electric vehicle battery fuse burnout detection and control method as described in any one of claims 1 to 7 are implemented.

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