WO2023241249A1

WO2023241249A1 - Battery pack maintenance system

Info

Publication number: WO2023241249A1
Application number: PCT/CN2023/092060
Authority: WO
Inventors: 王维林
Original assignee: 深圳市道通科技股份有限公司
Priority date: 2022-06-13
Filing date: 2023-05-04
Publication date: 2023-12-21
Also published as: CN115128495A

Abstract

The present application relates to a battery pack maintenance system, comprising a cloud platform and a diagnosis device. The diagnosis device can detect a battery pack online or offline, so that a vehicle model coverage is wider, and the compatibility is higher. Moreover, the diagnosis device obtains technical data and maintenance data by means of the cloud platform, determines, according to the technical data and detection data, whether a fault occurs in the battery pack, and if yes, maintains the battery pack according to the maintenance data, so that detection and maintenance integration is achieved, the maintenance efficiency and the maintenance effect are improved, and the user operation difficulty is reduced.

Description

A battery pack maintenance system

This application claims priority to the Chinese patent application filed with the China Patent Office on June 13, 2022, with application number 202210666772.3 and the application title "A battery pack maintenance system", the entire content of which is incorporated into this application by reference.

Technical field

This application relates to the field of electric vehicles, and in particular to a battery pack maintenance system.

Background technique

New energy vehicle battery pack failures account for a large proportion of all failures, and battery pack maintenance is very important for the detection and maintenance of new energy vehicles.

At present, some maintenance and diagnosis equipment for new energy vehicles have appeared on the market, but they are not systematic. The detection and maintenance are separated, and a complete closed-loop detection and maintenance process has not been formed. Moreover, the diagnostic tools of most manufacturers are only used in the original OBD vehicle diagnosis. On the basis of tools, some new energy vehicle diagnostic entrance improvements are made. It is essentially an OBD vehicle diagnostic system. It is powerless when the battery pack is out of the car environment and needs to use workshop protocol communication, so the coverage of vehicle models is limited.

Contents of the invention

The embodiments of the present application solve one of the above technical problems at least to a certain extent. To this end, the present application provides a battery pack maintenance system, which can realize integrated detection and maintenance of the battery pack of electric vehicles, and has better compatibility and wide vehicle model coverage. Wider.

In a first aspect, embodiments of the present application provide a battery pack maintenance system for use in electric vehicles. The electric vehicle includes several battery packs. The battery pack maintenance system includes a cloud platform, diagnostic equipment, and an electric vehicle detection device:

The cloud platform is communicatively connected to the diagnostic equipment and is used to provide technical data and maintenance data to the diagnostic equipment;

The diagnostic equipment is communicatively connected to the vehicle communication interface of the electric vehicle to conduct online detection of the battery pack;

The automobile communication interface is also connected to the battery pack or the battery management system of the battery pack through an electric vehicle detection device, so that the diagnostic device performs offline detection of the battery pack;

The diagnostic equipment is used to obtain detection data, and determine whether the battery pack fails based on the technical data and the detection data. If a failure occurs, repair the battery pack based on the maintenance data.

In some embodiments, the battery pack includes several battery modules, and the battery pack maintenance system further includes a balancing device;

The equalizing device is connected to the diagnostic device and the battery module respectively, and is used to equalize the pressure difference between the battery modules.

In some embodiments, the electric vehicle detection device includes an interaction unit, the interaction unit is connected to the vehicle communication interface;

The interactive unit is used to transmit interactive signals with the automobile communication interface. The interactive signals are used to represent the connection status with the automobile communication interface, the connection status with the battery pack and the current status of the electric vehicle detection device. Operating status.

In some embodiments, the electric vehicle detection device includes an SCI communication unit, and the SCI communication unit is connected to the vehicle communication interface;

The SCI communication unit is configured to receive a first control command sent by the diagnostic device, so that the electric vehicle detection device detects the battery pack.

In some embodiments, the electric vehicle detection device includes a signal simulation unit connected to the battery pack or the battery management system;

The signal simulation unit is used to simulate the safety signal and test signal of the battery pack operation.

In some embodiments, the electric vehicle detection device further includes a first CAN communication unit and a second CAN communication unit;

The first CAN communication unit is respectively connected to the automobile communication interface and the battery pack or the battery pack management system. The first CAN communication unit is used to transmit the detection data. The first CAN communication unit The communication protocol is controlled by the automotive communication interface;

The second CAN communication unit is respectively connected to the automobile communication interface and the battery pack or the battery pack management system. The second CAN communication unit is used to transmit a second control command to control the battery module. Outputs high voltage, and the communication protocol of the second CAN communication unit is controlled by the electric vehicle detection device.

In some embodiments, the detection levels of the battery pack detection system include vehicle level, battery pack level and battery module level.

In some embodiments, if the detection level is the vehicle level, the technical data and the maintenance data are obtained from the cloud platform through the first index number;

If the detection level is the battery pack level, obtain the technical data and the maintenance data from the cloud platform through the second index number;

If the detection level is the battery module level, obtain the technical data and the maintenance data from the cloud platform through the third index number. Repair data.

In some embodiments, a mapping relationship is established between the brand of the electric vehicle, the model of the electric vehicle, and the year of the electric vehicle, and the first index number is formed according to the mapping relationship;

The configuration of the same battery pack, the interface of the battery pack, and the communication protocol between the battery pack and the battery management system are formed into a group, and the group number is formed into the second index number;

The number of the battery module is formed into a third index number.

In some embodiments, the technical data includes loading and unloading guidance data of the battery pack, and the detection data includes communication detection data and safety detection data.

Compared with the existing technology, this application has at least the following beneficial effects: The battery pack maintenance system in this application includes a cloud platform and diagnostic equipment. The diagnostic equipment can perform online or offline detection of the battery pack, making the vehicle model coverage wider and compatible. Sex is higher. Moreover, the diagnostic equipment obtains technical data and maintenance data through the cloud platform, determines whether the battery pack fails based on the technical data and detection data, and if a failure occurs, repairs the battery pack based on the maintenance data to achieve integration of detection and maintenance. , improve maintenance efficiency and effectiveness, and reduce user operation difficulty.

Description of the drawings

One or more embodiments are exemplified by the pictures in the corresponding drawings. These illustrative illustrations do not constitute limitations to the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements. Unless otherwise stated, the figures in the drawings are not intended to be limited to scale.

Figure 1 is a schematic structural diagram of a battery pack maintenance system provided by an embodiment of the present application;

Figure 2 is a schematic structural diagram of another battery pack maintenance system provided by an embodiment of the present application;

Figure 3 is a schematic structural diagram of an electric vehicle detection device provided by an embodiment of the present application.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present application more clear, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application and are not used to limit the present application. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of this application.

It should be noted that, if there is no conflict, various features in the embodiments of the present application can be combined with each other, and they are all within the protection scope of the present application. In addition, although the functional modules are divided in the device schematic diagram and the logical sequence is shown in the flowchart, in some cases, the modules may be divided into different modules in the device, or the order shown in the flowchart may be executed. or describe the steps. Furthermore, the words "first", "second", "third" and other words used in this application do not limit the data and execution order, but only distinguish the same or similar items with basically the same functions and effects.

Please refer to Figure 1. Figure 1 is a schematic structural diagram of a battery pack maintenance system provided by an embodiment of the present application. The battery pack maintenance system 100 is applied to an electric vehicle 100. The electric vehicle 100 includes a plurality of battery packs 300. Specifically, The battery pack maintenance system 100 includes: an electric vehicle detection device 30 , a cloud platform 10 and a diagnostic device 20 .

In the battery pack maintenance system 100, the diagnostic equipment 20 is communicatively connected to the cloud platform 10 and the automobile communication interface 201 of the electric vehicle 100, and the automobile communication interface 201 is also connected to the electric vehicle detection device 30 (EV Box). The electric vehicle detection device 30 is connected to the battery pack 300 or the battery management system.

The diagnostic equipment 20 performs online detection on the battery pack 300 through the vehicle communication interface 201, and can also control the electric vehicle detection device 30 through the vehicle communication interface 201 to perform offline detection on the battery pack 300.

The diagnostic device 20 is also used to obtain detection data and upload the detection data to the cloud platform 10. The cloud platform 1010 can periodically record the detection data uploaded by the diagnostic device 20 and provide rational suggestions after analysis and processing.

Among them, the cloud platform 10 is a hardware device or hardware component used to provide computing services. In this embodiment, the cloud platform 10 includes a controller and a product server connected to the controller. The product server is used to provide services for the controller. Specifically, the controller has logical processing capabilities and is mainly used to analyze and process the data detected by the battery pack 300, provide rational suggestions, and make periodic records. In other words, the controller can be understood as the processor of the cloud service. ; The product server is mainly used for data access, that is, the product server can be understood as a memory with the function of storing data. When the cloud platform 10 communicates with the diagnostic device 20, the diagnostic device 20 can implement The data detected by the battery pack 300 is uploaded to the cloud platform 10 .

In addition, the cloud platform 10 also stores various technical data and maintenance data of the electric vehicle 100, which can send the technical data and maintenance data to the diagnostic equipment 20, and the diagnostic equipment 20 performs battery testing based on the technical data, maintenance data and detection data. The fault conditions and maintenance conditions of the package 300 are analyzed and processed. For example, the diagnostic device 20 determines whether the battery pack 300 is faulty based on the technical data and detection data. If a fault occurs, the battery pack 300 is repaired based on the maintenance data, or the maintenance data is sent to the maintenance client or maintenance end. The inspection user or maintenance user is allowed to perform maintenance on the battery pack 300 .

The cloud platform 10 also stores three levels of databases: car level, battery pack level and battery module level, and establishes a mapping relationship between the three levels of databases to solve multi-level data requirements. At the vehicle level, the technical data and maintenance data provided by the cloud platform 10 mainly include topology diagrams, high-voltage system block diagrams, automobile fault code analysis, maintenance data, etc. At the battery pack level, the technical data and maintenance data provided by the cloud platform 10 mainly include Including data such as offline communication protocols, offline detection environment simulation, offline testing and maintenance methods, solving the problems of offline fault detection and safety testing of the battery pack 300. At the battery module level, the technical data and maintenance data provided by the cloud platform 10 mainly include batteries Module communication, module organizational structure, charge and discharge control parameters and other data required for module balancing, etc.

The diagnostic device 20 may be any suitable type of electronic device that has certain logical computing capabilities and provides one or more functions that can satisfy the user's intention. For example, personal computers, tablets, smartphones, inspection robots, etc. Users (for example, maintenance workers or maintenance users, etc.) can communicate with the diagnostic device 20 through one or more user interaction devices (such as mouse, keyboard, remote control, touch screen, motion sensing camera, audio collection device, etc.) of any suitable type. Interact, input instructions or control the diagnostic device 20 to perform one or more operations. In addition, the diagnostic device 20 can communicate with the electric vehicle detection device 30 through the vehicle communication interface 201, and can read the detection data of the electric vehicle detection device 30 based on the communication connection. Furthermore, the diagnostic device 20 can also be installed with any type of client software, such as a detection APP, through which the client software communicates with the electric vehicle detection device 30 to send request messages to the electric vehicle detection device 30 and commands, and the purpose of receiving the content fed back by the electric vehicle detection device 30. Correspondingly, the electric vehicle detection device 30 can process the request message or command sent by the diagnostic device 20 and send the detection data to the corresponding diagnostic device 20 .

Among them, the electric vehicle detection device 30 runs detection software capable of detecting a certain battery pack 300, and the corresponding battery pack 300 can be analyzed and detected through the detection software. The electric vehicle detection device 30 is connected to the vehicle communication interface 201. The vehicle communication interface 201 can communicate with the diagnostic device 20 through a wired or wireless network, so that the diagnostic device 20 can operate and control the electric vehicle detection device 30 in real time.

Based on the above battery pack maintenance system 100, in practical applications, when a certain battery pack 300 needs to be tested, the user can first establish a communication connection between the electric vehicle 100 and the diagnostic device 20 through the car communication interface 201, and then use the car communication interface 201 to 201 Establish a communication connection between the electric vehicle detection device 30 and the diagnostic device 20. Then, the user can interact with the diagnostic device 20, log in to the client software used to communicate with the electric vehicle detection device 30 or the electric vehicle 100, and instruct the diagnostic device. 20. Send a connection request message to the electric vehicle detection device 30 or the electric vehicle 100. After receiving the connection request message, the electric vehicle detection device 30 or the electric vehicle 100 sends the address information of the electric vehicle detection device 30 or the electric vehicle 100 to the diagnosis device. Equipment 20. Furthermore, the diagnostic device 20 can establish a communication connection with the electric vehicle detection device 30 or the electric vehicle 100 based on the address information fed back by the electric vehicle detection device 30 or the electric vehicle 100 in response to the connection request message.

Then, the user can input an operation instruction to the diagnostic device 20. When receiving the operation instruction, the diagnostic device 20 sends the operation instruction to the electric vehicle 100; and when receiving the operation instruction, the electric vehicle 100 responds to the operation instruction. Operating instructions. After the detection of the battery pack 300 is completed, the communication connection between the diagnostic device 20 and the electric vehicle 100 can be disconnected.

When testing the battery pack 300, the diagnostic device 20 obtains the technical data sent by the cloud platform 10 and obtains the testing data fed back by the electric vehicle 100 online. Based on the technical data and testing data, it determines whether the battery pack 300 has malfunctioned. If so, If there is a fault, the maintenance data sent by the cloud platform 10 is obtained, and then the battery pack 300 is repaired based on the maintenance data.

If the battery pack 300 is offline, the battery pack 300 is detected by the electric vehicle detection device 30 and the detection data is fed back to the diagnostic device 20 through the vehicle communication interface 201 so that the diagnostic device 20 can perform offline detection of the battery pack 300 .

In the same way, when the electric vehicle 100 needs to be tested for the whole vehicle or the battery module needs to be tested, if the battery pack 300 is in the whole vehicle environment, online detection is implemented through the car interface. If the battery pack 300 is separated from the whole vehicle environment, Then the diagnostic equipment 20 is connected to the electric vehicle detection device 30 through the vehicle interface to implement offline detection of the battery pack 300 or battery module.

The diagnostic equipment 20 can store the detection data and maintenance data locally, or can send the detection data and maintenance data to the cloud platform 10 to realize cloud storage. The cloud platform 10 will also map the detection data and maintenance data with corresponding technical data. relationship to facilitate subsequent index searches.

In some embodiments, the diagnostic device 20 can also communicate with the remote expert 400 to obtain maintenance guidance from the remote expert 400. Therefore, technical data is obtained through the cloud platform 10 to help the maintenance technology troubleshoot and solve faults in the form of a wizard, and cooperate with maintenance. Tools and online maintenance guidance from 400 remote experts enable closed-loop maintenance processing.

Among them, it should be noted that although only one diagnostic device 20, one cloud platform 10 and one electric vehicle detection device 30 are shown in Figure 1, those skilled in the art can understand that during actual application, The battery pack maintenance system 100 may also include more or less diagnostic equipment 20 , cloud platform 10 and electric vehicle detection device 30 . Moreover, in order to improve usage efficiency, the same electric vehicle detection device 30 can run a variety of different detection software, or multiple different electric vehicle detection devices 30 can also run the same detection software. This is the case in the embodiment of the present application. There are no specific limitations.

The communication connections in the above embodiments can be wired communication or wireless communication. The wired communication method includes but is not limited to Universal Serial Bus (USB), such as Mini USB interface, Micro USB interface and USB Type C interface, etc. Wireless communication methods include but are not limited to mobile operator networks such as 2G/3G/4G/5G, or wireless local area networks (WLAN) under any standard (such as Wireless Fidelity (Wi-Fi) ) network), Bluetooth (BT), Global Navigation Satellite System (GNSS), Frequency Modulation (FM), Near Field Communication (NFC) and infrared technology (Infrared, IR) and other wireless communication solutions.

In summary, the battery pack maintenance system 100 includes a cloud platform 10 and a diagnostic device 20. The diagnostic device 20 can perform online or offline detection on the battery pack 300, so as to achieve wider vehicle model coverage and higher compatibility. Moreover, the diagnostic device 20 obtains technical data and maintenance data through the cloud platform 10, determines whether the battery pack 300 has malfunctioned based on the technical data and detection data, and if a malfunction occurs, repairs the battery pack 300 based on the maintenance data to implement detection. Integrated with maintenance, improve maintenance efficiency and effect, and reduce user operation difficulty.

In some embodiments, the detection levels of the battery pack maintenance system 100 include vehicle level, battery pack level, and battery module level. The detection methods and detection data corresponding to different levels are different, and the technical data obtained are also different.

At the vehicle level, through the combination of traditional diagnosis, high-voltage diagnosis and intelligent diagnosis, users can quickly locate the fault type of the battery pack 300, view the location of the faulty cells in the battery pack 300, and analyze whether the battery pack 300 needs to be disassembled for repairs. .

Among them, vehicle-level high-voltage diagnosis is unique to the electric vehicle 100. This part mainly provides information and technical manual services, showing users the distribution of high-voltage systems in the car, wiring and location structure, high-voltage parts list, battery The planar organization of the battery pack, the 3D organizational structure of the battery pack, and the exploded view of the battery pack, etc.

In the traditional diagnosis method, the fault data and real-time data (data stream) in the car, as well as some action tests, are mainly obtained through the car communication interface 201 and communication protocols.

In the intelligent diagnosis mode, information such as topology diagram, parts list, fault code wizard, and detection plan are mainly obtained to quickly locate the fault type of the battery pack 300.

The technical information in the above three diagnostic methods can be obtained from the cloud platform 10, and the detection data after detection can also be uploaded to the cloud platform 10 for recording by the cloud platform 10.

If the detection level is at the battery pack level, it will mainly carry out loading and unloading guidance, communication detection and safety detection. Loading and unloading guidance generally includes battery pack organizational structure, loading and unloading guidance, unpacking guidance, visual inspection and packaging guidance, etc. Communication testing generally includes communication configuration, signal configuration, data flow reading, fault code reading and consistency testing. etc. Safety testing generally includes signal testing, insulation testing, air tightness testing, relay testing, high voltage testing and power supply configuration, etc. The technical information required for the above-mentioned battery pack level testing can be obtained from the cloud platform 10, and the testing data after testing can also be uploaded to the cloud platform 10 for recording by the cloud platform 10.

If the detection level is at the battery module level, it mainly detects module startup and communication, module charging and discharging parameters, and module temperature configuration. Similarly, the technical information required for battery module level testing can be obtained from the cloud platform 10, and the testing data after testing can also be uploaded to the cloud platform 10 for recording by the cloud platform 10.

In some embodiments, in the above three levels of detection, if technical data and maintenance data need to be obtained from the cloud platform 10, they can be quickly obtained through the index number.

Specifically, if the detection level is the vehicle level, the technical data and the maintenance data are obtained from the cloud platform 10 through the first index number; if the detection level is the battery pack level, the technical data and the maintenance data are obtained through the first index number. The second index number is used to obtain the technical data and the maintenance data from the cloud platform 10. If the detection level is the battery module level, the technical data is obtained from the cloud platform 10 through the third index number. and said maintenance data.

The first index number, the second index number and the third index number can be set according to user needs, and the detection data after detection can also be correspondingly stored in the cloud platform 10 through the first index number, the second index number and the third index number. , for users to find. The technical data, maintenance data and inspection data are mapped correspondingly through the index number, making it convenient for users to directly search and improve maintenance efficiency.

In some embodiments, a mapping relationship is established between the brand of the electric vehicle 100 , the model of the electric vehicle 100 and the year of the electric vehicle 100 , and the first index number MMY (Make, Model, Year). The same configuration of the battery pack 300, the interface of the battery pack 300, and the communication protocol between the battery pack 300 and the battery management system are formed into a group, and the group number is formed into the second index number. Gid(Group id). The number of the battery module is formed into a third index number Mid (Module id).

On the cloud platform 10, according to the composition structure of the electric vehicle 100, the corresponding relationship between MMY, Gid, and Mid is constructed. On the diagnostic tool, the user can conveniently search for the required maintenance process and diagnostic protocol from MMY. Usually MMY is mainly used for Online diagnosis, GID is mainly used for Offline diagnosis, and Mid is mainly used for module balancing.

Therefore, the battery pack maintenance system includes a cloud platform and diagnostic equipment. The diagnostic equipment can perform online or offline detection of the battery pack, making the vehicle model coverage wider and the compatibility higher. Moreover, the diagnostic equipment obtains technical data and maintenance data through the cloud platform, determines whether the battery pack fails based on the technical data and detection data, and if a failure occurs, repairs the battery pack based on the maintenance data to achieve integration of detection and maintenance. , improve maintenance efficiency and effectiveness, and reduce user operation difficulty.

Please refer to Figure 2. Figure 2 is a schematic structural diagram of a battery pack maintenance system provided by an embodiment of the present application. As shown in Figure 2, the battery pack maintenance system 100 also includes a balancing device 40, wherein the battery pack 300 includes A plurality of battery modules 301, the balancing device 40 is connected to the diagnostic device 20 and the battery module 301 respectively, and is used to balance the voltage difference between the battery modules 301.

A communication connection is established between the balancing device 40 and the diagnostic device 20 , and the diagnostic device 20 can send the technical data or maintenance data obtained by the cloud platform 10 to the balancing device 40 . For example, during diagnosis of the battery pack 300, if poor battery consistency is detected and the battery module 301 needs to be replaced or repaired, the battery module 301 needs to be balanced. The balancing device 40 obtains the communication protocol and charge and discharge parameters of the battery module 301 from the cloud platform 10, charges and discharges the battery module 301, and makes the voltage of the repaired battery module 301 cells consistent with the voltage of other normal battery modules 301 cells. , eliminating faults caused by inconsistent cell voltage differences.

Please refer to Figure 3. Figure 3 is a schematic structural diagram of an electric vehicle detection device provided by an embodiment of the present application. As shown in Figure 3, the electric vehicle detection device 30 includes an interaction unit 301. The interaction unit 301 interacts with the vehicle. Communication interface 201 connection;

The interactive unit 301 is used to transmit interactive signals with the car communication interface 201. The interactive signals are used to represent the connection status with the car communication interface 201, the connection status with the battery pack 300 and the electric vehicle. The current operating status of the device 30 is detected.

The interactive signal is an analog signal, and the connection status with the car communication interface 201 is detected through the interactive signal. The electric vehicle detection device 30 can also output different voltages on the interactive signal to indicate its connection status with other devices or equipment and its current operating status, for example: the connection between the electric vehicle detection device 30 and the battery pack 300 or the battery management system. Connection status, the battery power level of the electric vehicle detection device 30 itself.

The power supply voltage of the electric vehicle detection device 30 is generally 12V, and the power supply voltage of the electric vehicle detection device 30 can be adjusted to 9-16V through an adjusting device. The built-in power supply can supply power to each unit inside the capacitive vehicle detection device, so that the electric vehicle detection device 30 can operate normally. By detecting the voltage on the interactive signal line, the remaining power of the built-in power supply or its current working status can be obtained.

In some embodiments, the electric vehicle detection device 30 includes an SCI communication unit 302 connected to the vehicle communication interface 201 , and the SCI communication unit 302 is configured to receive the first signal sent by the diagnostic device 20 . A control command to cause the electric vehicle detection device 30 to detect the battery pack 300 .

SCI is a serial communication standard, and the SCI communication unit 302 is connected to the automobile communication interface 201 through pins. The diagnostic equipment 20 sends a first control command to the electric vehicle detection device 30 , which the electric vehicle detection device 30 receives through the SCI communication unit 302 . The first control command may instruct the electric vehicle detection device 30 to perform operations on the battery pack 300 or the battery management system. Detect, or instruct the electric vehicle detection device 30 to simulate the interactive signals of the entire vehicle on the battery pack 300 that is separated from the entire vehicle environment, such as PWM, 0-12V variable voltage, safety collision signal, interlock signal, service switch signal, ignition switch signal, etc.

In some embodiments, the electric vehicle detection device 30 includes a signal simulation unit 303 connected to the battery pack 300 or the battery management system, and the signal simulation unit 303 is used to simulate the Safety signals and test signals for the operation of the battery pack 300.

After receiving the first control command sent by the diagnostic device 20 , the electric vehicle detection device 30 can control the signal simulation unit 303 to generate a safety signal and a test signal for the operation of the battery pack 300 . Safety signals include PWM, variable voltage, various complex change signals, interlocking loop normal signals, service ready signals, battery balancing signals, etc., which are various analog signals for safe operation of the car. The test signal includes some insulation performance test signals. For example, the test signal is a high-voltage signal above 1000V. The high-voltage signal is connected to the target being tested (such as an electrical contact or plug), and then the input signal is collected to detect the resistance of the target being tested. Insulation safety performance of high voltage circuit.

The signal simulation unit 303 enables the electric vehicle detection device 30 to support the simulation of the vehicle operating environment, including auxiliary power output, workshop communication protocol support, and the generation of various safety signals (interlock signal, service switch signal, airbag signal, ignition switch signal light ), solving the application requirements for offline fault detection and safety testing when the battery pack 300 is separated from the vehicle environment.

In some embodiments, the electric vehicle detection device 30 further includes a first CAN communication unit 304 and a second CAN communication unit 305. The first CAN communication unit 304 is connected to the car communication interface 201 and the battery pack 300 or the battery pack 300 management system respectively. The first CAN communication unit 304 is used to transmit the detection data. The communication protocol of the first CAN communication unit 304 is controlled by the vehicle communication interface 201 . The second CAN communication unit 305 is connected to the car communication interface 201 and the battery respectively. The package 300 or the battery pack 300 management system is connected. The second CAN communication unit 305 is used to transmit a second control command to control the battery module 301 to output high voltage. The communication protocol of the second CAN communication unit 305 Controlled by the electric vehicle detection device 30.

The first CAN communication unit 304 is mainly used for diagnostic CAN function (request response mode), and the protocol interaction is controlled by the automobile communication interface 201. The second CAN communication unit 305 is mainly used for the power CAN function, and the interactive control Pack outputs high-voltage control commands (often It is periodic and sends dynamically changing instructions with relatively high timing requirements), and the EV Box controls this part of the protocol. When the power CAN (second CAN communication unit 305) and diagnostic CAN (first CAN communication unit 304) of a certain battery pack 300 are combined, the commands for diagnosis and high-voltage output control can be deployed on the same CAN bus. The battery pack 300 usually uses high-speed CAN or CAN FD to communicate. A terminal resistor needs to be configured on the CAN bus. The EV Box can detect the terminal resistor configured on the battery pack 300 end and automatically adapt to the terminal resistor on the other end to ensure normal CAN communication. The baud rate of CAN communication can be queried from the cloud platform 10 through the index, and the detected CAN terminal resistance can also be updated to the cloud platform 10 synchronously.

In some embodiments, the electric vehicle detection device 30 also includes a control unit 306, which is connected to the interaction unit 301, the SCI communication unit 302, the signal simulation unit 303, the first CAN communication unit 304 and the second CAN communication unit respectively. 305 connection, which is used to control the work of each unit in the electric vehicle detection device 30. For example, the configuration of the above-mentioned terminal resistor can be completed by the control unit 306, or the signal transmission, signal collection and interlock loop control, All can be completed by the control unit 306. However, it should be noted that in some embodiments, some units may be integrated with the control unit 306, such as the interaction unit 301.

In order to better understand the working process of the battery pack maintenance system 100, the maintenance process of a certain battery pack 300 is taken as an example to describe its specific working process:

(1) First cut off the high voltage power/disconnect the service switch;

(2) Use high-voltage measurement tools to detect residual electricity;

(3) Use a battery pack lift and disassembly tools to disassemble the battery pack;

(4) Unpacking the battery pack;

(5) Visual inspection: inspection for smoke, fluid flow, deformation, abnormal noise, etc.;

(6) If a failure occurs, the battery pack needs to be replaced, or if poor battery consistency is detected, the battery module needs to be replaced or repaired;

(7) Use balancing equipment to obtain the communication protocol and charge and discharge parameters of the battery module from the cloud platform, charge and discharge the repaired battery module, and make the repaired battery module cell voltage consistent with other normal battery module cell voltages. consistent; consistent;

(8) Use electric vehicle diagnostic equipment to conduct consistency checks and safety tests on battery modules. This test is offline testing;

(9) Seal the battery pack;

(10) Pre-loading inspection, including air tightness, communication, data flow and safety tests;

(11) Loading;

(12) Trial operation.

The disassembly guidance and technical data involved in the above process can be obtained from the cloud platform. The detection and testing involved can be uploaded to the cloud platform. The maintenance data can then be obtained from the cloud platform to perform maintenance on the battery pack. repair. Among them, the detection, replacement, equalization and testing of the battery pack are all offline diagnostics, which are battery pack level and battery module level testing. After repackaging, the testing during vehicle loading are all online diagnosis, which are vehicle level testing.

In summary, the battery pack maintenance system includes a cloud platform and diagnostic equipment. The diagnostic equipment can perform online or offline detection of the battery pack, making it wider vehicle coverage and higher compatibility. Moreover, the diagnostic equipment obtains technical data and maintenance data through the cloud platform, determines whether the battery pack fails based on the technical data and detection data, and if a failure occurs, repairs the battery pack based on the maintenance data to achieve integration of detection and maintenance. , improve maintenance efficiency and effectiveness, and reduce user operation difficulty.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present application, but not to limit it; under the idea of the present application, the technical features of the above embodiments or different embodiments can also be combined. The steps may be performed in any order, and there are many other variations of different aspects of the application as described above, which are not provided in detail for the sake of brevity; although the application has been described in detail with reference to the foregoing embodiments, one of ordinary skill in the art Skilled persons should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not deviate from the essence of the corresponding technical solutions from the implementation of the present application. Example scope of technical solutions.

Claims

A battery pack maintenance system applied to electric vehicles. The electric vehicle includes several battery packs. The battery pack maintenance system includes a cloud platform, diagnostic equipment and an electric vehicle detection device:

The cloud platform is communicatively connected to the diagnostic equipment and is used to provide technical data and maintenance data to the diagnostic equipment;

The diagnostic equipment is communicatively connected to the vehicle communication interface of the electric vehicle to conduct online detection of the battery pack;

The automobile communication interface is also connected to the battery pack or the battery management system of the battery pack through an electric vehicle detection device, so that the diagnostic device performs offline detection of the battery pack;

The diagnostic equipment is used to obtain detection data, and determine whether the battery pack fails based on the technical data and the detection data. If a failure occurs, repair the battery pack based on the maintenance data.
The battery pack maintenance system according to claim 1, wherein the battery pack includes a plurality of battery modules, and the battery pack maintenance system further includes a balancing device;

The equalizing device is connected to the diagnostic device and the battery module respectively, and is used to equalize the pressure difference between the battery modules.
The battery pack maintenance system according to claim 1, the electric vehicle detection device includes an interactive unit, the interactive unit is connected to the vehicle communication interface;

The interactive unit is used to transmit interactive signals with the automobile communication interface. The interactive signals are used to represent the connection status with the automobile communication interface, the connection status with the battery pack and the current status of the electric vehicle detection device. Operating status.
The battery pack maintenance system according to claim 1, the electric vehicle detection device includes an SCI communication unit, and the SCI communication unit is connected to the vehicle communication interface;

The SCI communication unit is configured to receive a first control command sent by the diagnostic device, so that the electric vehicle detection device detects the battery pack.
The battery pack maintenance system according to claim 1, the electric vehicle detection device includes a signal simulation unit, the signal simulation unit is connected to the battery pack or the battery management system;

The signal simulation unit is used to simulate the safety signal and test signal of the battery pack operation.
The battery pack maintenance system according to claim 1, the electric vehicle detection device further includes a first CAN communication unit and a second CAN communication unit;

The first CAN communication unit is respectively connected to the automobile communication interface and the battery pack or the battery pack management system. The first CAN communication unit is used to transmit the detection data. The first CAN communication unit The communication protocol is controlled by the automotive communication interface;

The second CAN communication unit is respectively connected to the automobile communication interface and the battery pack or the battery pack management system. The second CAN communication unit is used to transmit a second control command to control the battery module. Outputs high voltage, and the communication protocol of the second CAN communication unit is controlled by the electric vehicle detection device.
According to the battery pack maintenance system according to any one of claims 1 to 6, the detection levels of the battery pack detection system include vehicle level, battery pack level and battery module level.
The battery pack maintenance system according to claim 7,

If the detection level is the vehicle level, obtain the technical data and the maintenance data from the cloud platform through the first index number;

If the detection level is the battery pack level, obtain the technical data and the maintenance data from the cloud platform through the second index number;

If the detection level is the battery module level, the technical data and the maintenance data are obtained from the cloud platform through a third index number.
The battery pack maintenance system according to claim 8,

Establish a mapping relationship between the brand of the electric vehicle, the model of the electric vehicle and the year of the electric vehicle, and form the first index number based on the mapping relationship;

The configuration of the same battery pack, the interface of the battery pack, and the communication protocol between the battery pack and the battery management system are formed into a group, and the group number is formed into the second index number;

The number of the battery module is formed into a third index number.
According to the battery pack maintenance system according to any one of claims 1 to 6, the technical data includes loading and unloading guidance data of the battery pack, and the detection data includes communication detection data and safety detection data.