Fault diagnosis box and fault diagnosis system for power battery
By designing a fault diagnosis box, the problems of misconnection, loose connection or short circuit in power battery testing were solved, and concurrent communication of multiple CAN signals and improved test stability were achieved.
Patent Information
- Application Number
- CN202422717491.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-07
- Publication Date
- 2025-10-28
- Estimated Expiration
- 2034-11-07
AI Technical Summary
In traditional power battery testing, frequent misconnections, loose connections, or short circuits at the communication port lead to test failures and make it impossible to test multiple CAN signals simultaneously, resulting in low testing efficiency.
A fault diagnosis box was designed, which includes a communication port, a CAN bus interface, a power supply port and a power supply circuit. It is connected to the battery management system through a busbar to realize concurrent communication of multiple CAN signals and safe and reliable circuit connection.
It improves the stability and reliability of testing, simplifies the wiring process, avoids misconnection, loose connection or short circuit, and realizes the coordinated testing of multiple CAN signals.
Smart Images
Figure CN223486144U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of power battery fault diagnosis technology, and in particular to a fault diagnosis box and fault diagnosis system for power batteries. Background Technology
[0002] Before leaving the factory, power batteries undergo a series of tests, including electrical performance testing, safety performance testing, environmental adaptability testing, mechanical performance testing, lifespan testing, battery pack balancing testing, insulation resistance testing, electrical connection testing, and software and communication testing, to ensure their performance, safety, and reliability. During some of these tests, it may be necessary to collect a series of signals from the power battery and / or issue commands to the battery for diagnostics, recording, and tracking.
[0003] However, the power battery, or its battery management system, only has one external communication port, such as the Harting port. In traditional battery functional testing, testers must manually connect each pin of the battery management system's communication port one by one. This connection process is prone to misconnections, loose connections, or even short circuits, leading to test failures, inaccurate results, or even damage to the battery management system. Furthermore, when one bus interface card or CAN box is connected, another CAN box cannot be connected, meaning only one CAN bus signal can be tested simultaneously, resulting in low testing efficiency and preventing the testing of multiple CAN signals working together. Currently, multi-channel, comprehensive communication with the power battery's battery management system is not yet possible. Summary of the Invention
[0004] The purpose of this invention is to provide a fault diagnosis box and a fault diagnosis system for power batteries, so as to improve the testing efficiency in battery function testing and realize the testing of multiple CAN signals cooperating with each other.
[0005] The first aspect of this utility model provides a fault diagnosis box, which includes: a communication port, at least two CAN bus interfaces, a power supply port, and a power supply circuit.
[0006] The communication port is configured to connect to the battery management system of the power battery via a busbar. The communication port has at least four tap pins, which are used to connect different CAN signals from the battery management system.
[0007] Each of the at least two CAN bus interfaces includes two pins and an impedance matching resistor connected between the two pins. The two pins are respectively connected to two tap pins in the tap pins. The at least two CAN bus interfaces are used to transmit one CAN signal.
[0008] A power supply port, the power supply port including power supply pins for supplying power to the battery management system via the line bus;
[0009] A power supply circuit having two power supply lines, including a positive power supply line and a negative power supply line, which are connected to power supply pins.
[0010] The fault diagnosis box according to this invention firstly provides operating power, especially low-voltage power, to the independent power battery through the power supply circuit, thereby ensuring the operation of its battery management system outside the vehicle environment. Secondly, the connection between the fault diagnosis box and the battery management system via the cable connector simplifies wiring and ensures a safe and error-free circuit connection, avoiding misconnections, loose connections, or short circuits that are prone to occur when manually connecting pins, thus ensuring the effectiveness and safety of the test. Thirdly, the fault diagnosis box effectively separates each CAN signal through the connection between the tap pins built into the communication port and the pins of the CAN bus interface, and provides a separate CAN bus interface for each CAN signal. This enables concurrent communication of multiple CAN signals of the battery management system, thereby enabling the testing of multiple CAN signals in coordination. Finally, the integrated design of the fault diagnosis box not only provides convenience for testers in test connections, but also improves the overall stability and reliability of the test.
[0011] According to one embodiment of this utility model, the CAN signal may include at least two of the following: IPB_CAN signal, APPL_CAN signal, PTH_CAN signal, DC / DC_CAN signal, and XETK signal. Here, the IPB_CAN (Intelligent Power Battery CAN) signal is typically used for monitoring and controlling the intelligent power management system and for communication with other control units. The APPL_CAN (Application CAN) signal is typically used for application-layer communication to process information required for specific user application functions. This may include, for example, data transmission between PCU (Power Control Unit) or other application control modules. The PTH_CAN (Path CAN) signal may be associated with vehicle path control to transmit dynamic information related to steering, suspension, tires, etc., to ensure vehicle stability and handling. The DC / DC_CAN (DC to DCConverter CAN) signal is typically associated with monitoring and controlling DC / DC converters used for voltage conversion and power management. The XETK (eXtended External Test and Calibration) signal is a signal used for real-time monitoring and testing of the control unit (ECU). IPB_CAN, APPL_CAN, PTH_CAN, and DC / DC_CAN signals can provide CAN bus signals needed for electrical performance testing, safety performance testing, environmental adaptability testing, life testing, battery pack equalization testing, insulation resistance testing, electrical connection testing, and software and communication testing.
[0012] According to one embodiment of this utility model, the CAN bus interface can be configured to connect to a host computer, thereby transmitting CAN signals to the host computer and / or receiving instructions from the host computer via the CAN bus interface. This allows the host computer to be used for diagnosis, recording, and tracking of the power battery and its battery management system. In particular, it also enables hardware-in-the-loop (HIL) simulation for power battery testing, such as testing the response of the power battery and its battery management system through operating condition simulation and fault injection.
[0013] According to one embodiment of this utility model, the CAN bus interface can be connected to a host computer via a bus interface card. Preferably, a bus interface card or CAN box can be used to convert CAN signals to USB or Ethernet signals, thereby facilitating signal connection with a preset interface in the host computer.
[0014] According to one embodiment of this utility model, the power supply line can be connected to a device for measuring voltage and / or a device for measuring current, so that the measured current value can be used to diagnose whether the power supply line is supplying power normally. In particular, the abnormality of voltage and / or circuit can be used to simply determine the circuit abnormality of the fault test box, such as short circuit or open circuit.
[0015] According to one embodiment of this utility model, the CAN bus interface can also be connected to a control switch, which is used to control whether the CAN bus interface is connected. Different CAN signals can be controlled by closing different control switches. In particular, with the help of these control switches, the absence of one or more CAN signals can be simulated through simple switching operations.
[0016] According to one embodiment of this utility model, the control switch can be a relay or a double-pole single-throw switch, wherein the first and second contacts of the control switch are connected in series with an impedance matching resistor to one pin of the CAN bus interface, and the third and fourth contacts of the control switch are connected to the positive power supply line and the negative power supply line, respectively.
[0017] Preferably, the third and fourth contacts of the control switch may also be connected in series with a first indicator light, which indicates whether the CAN bus interface is in a working state based on whether the control switch is on or off. The brightness of different indicator lights allows for quick identification of which CAN signal is currently available for communication.
[0018] According to one embodiment of the present invention, a second indicator light may be connected between the positive power supply line and the negative power supply line. The second indicator light is used to indicate whether the fault diagnosis box is powered.
[0019] According to one embodiment of this utility model, the power supply port may include two power supply pins, one of which is connected to the positive power supply line, and the other of which is connected to the negative power supply line. This allows power, particularly low-voltage power, to be supplied to the battery management system via the power supply port.
[0020] Preferably, a main switch can be connected to the positive power supply line leading to one of the power supply pins. The main switch controls whether power is supplied to the battery management system through the power supply port.
[0021] Preferably, the power supply port may further include a wake-up pin, which is connected to the positive power supply line via a wake-up switch. When the main switch is closed, a wake-up signal or wake-up pulse can be triggered by quickly switching the wake-up switch once, thereby waking up the battery management system and starting it accordingly.
[0022] Preferably, a main indicator light is connected downstream of the main switch between the positive and negative power supply lines; and / or a wake-up indicator light is connected downstream of the wake-up switch between the positive and negative power supply lines. The main indicator light can indicate the state of the main switch, while the wake-up indicator light can indicate the switching process of the wake-up switch.
[0023] According to one embodiment of this utility model, the fault diagnosis box may have five CAN bus interfaces. Preferably, the five CAN bus interfaces can be used to transmit IPB_CAN signals, APPL_CAN signals, PTH_CAN signals, DC / DC_CAN signals, and XETK signals, respectively.
[0024] According to one embodiment of this utility model, the CAN bus interface can be configured as an XETK module. The XETK module has four pins. Two of these pins are connected to two tap pins of each of the three tap pins. The other two power supply pins are connected to the positive and negative power supply lines, respectively, thereby supplying power to the XETK module. The XETK module can be particularly used for measuring and calibrating parameters and control parameters of a battery management system.
[0025] Preferably, the XETK module may also be connected to a switch assembly capable of simultaneously connecting the other two pins to the positive and negative power supply lines, respectively. When closed, the switch assembly activates the first indicator light connected between the positive and negative power supply lines. Here, the switch assembly is a relay, particularly a three-way relay or a three-pole single-throw switch. The first and second contacts of the switch assembly are connected to the other two pins of the XETK module, respectively; the third contact is connected to one end of the first indicator light; the other end of the first indicator light is connected to the negative power supply line; the fourth and fifth contacts are connected to the positive and negative power supply lines, respectively; and the sixth contact is connected to the positive power supply line.
[0026] The second aspect of this utility model provides a fault diagnosis system, the fault diagnosis system comprising: a fault diagnosis box according to the first aspect of this utility model, a power battery, and a host computer; wherein, the battery management system of the power battery is connected to the fault diagnosis box via a busbar; the host computer is used to communicate with the battery management system of the power battery through the fault diagnosis box.
[0027] By communicating with the power battery using different CAN signals and / or issuing instructions to the power battery management system according to the fault diagnosis system of this utility model, the power battery and its battery management system can be diagnosed, recorded, and coded.
[0028] The various embodiments, functions, advantages and effects according to one aspect of the present invention are also applicable in a corresponding manner to other aspects according to the present invention.
[0029] Other features of this invention are derived from the accompanying drawings and the detailed description. All features and combinations thereof mentioned above in the specification, as well as features and combinations thereof mentioned below in the detailed description and / or shown separately in the drawings, can be used not only in the corresponding combinations given, but also in other combinations, or in their individual states. Attached Figure Description
[0030] Figure 1 The circuit diagram is shown below for the design of the fault diagnosis box according to this utility model.
[0031] Figure 2 This is a schematic diagram of the panel of the fault diagnosis box according to the present invention;
[0032] Figure 3 This is a block diagram of the fault diagnosis system according to the present invention. Detailed Implementation
[0033] To make the technical problems, technical solutions, and advantages of this utility model clearer, a detailed description will be provided below in conjunction with the accompanying drawings and specific embodiments. In the following description, specific details such as particular configurations and components are provided merely to aid in a comprehensive understanding of the embodiments of this utility model. Therefore, those skilled in the art should understand that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of this utility model. Furthermore, for clarity and brevity, descriptions of known functions and structures have been omitted.
[0034] The expression “and / or” as used herein means to include at least one of the components listed before and after the expression. Furthermore, the expressions “connected,” “linked,” etc., as used herein mean to include a direct connection to another component or an indirect connection via another component, such as a cable. The singular form in this document also includes the plural form, unless specifically stated in the wording. Moreover, the use of “comprises” or “includes” in this document means that at least one other component, step, operation, or element is present or added.
[0035] Figure 1 A fault diagnosis box 1 according to a preferred embodiment of the present invention is shown. The fault diagnosis box 1 includes: a communication port CP, at least two CAN bus interfaces 17, a power supply port SP, and a power supply circuit 5.
[0036] The communication port CP is configured to connect to the battery management system (BMS) of the power battery BA via the busbar CB. The communication port CP has at least four tap pins 3, which are used to connect different CAN signals from the battery management system (BMS).
[0037] Each CAN bus interface 17 includes two pins and an impedance matching resistor 6 connected between the two pins. The two pins are respectively connected to two tap pins in the tap pins 3. The at least two CAN bus interfaces 17 are used to transmit one CAN signal.
[0038] The power supply port SP includes a power supply pin 4 for supplying power to the battery management system (BMS) via the busbar CB.
[0039] The power supply circuit 5 has two power supply lines, including a positive power supply line H and a negative power supply line L, which are connected to the power supply pin 4.
[0040] In such Figure 1 In the circuit diagram of the preferred embodiment shown, the fault diagnosis box 1 is indicated by a rectangular box at the top, representing a connection port 2. This connection port 2 includes a communication port CP and a power supply port SP. This connection port 2 can be configured as a Harding port, such as a Harding port with over 40 wires, thereby enabling the use of a busbar CB configured as a Harding cable (see...). Figure 2 This is connected to the Battery Management System (BMS) of the power battery (BA). The numbers in the rectangular box represent the pin numbers according to the corresponding pin definitions. It is possible that two power supply leads are branched from the busbar (CB) and connected to the low-voltage terminals of the power battery (BA).
[0041] Figure 1 The fault diagnosis box 1 shown preferably includes five CAN bus interfaces 17. These CAN bus interfaces are represented by small rectangular boxes, each labeled with a corresponding CAN signal type. These CAN signals include, for example, IPB_CAN, APPL_CAN, PTH_CAN, DC / DC_CAN, and XETK signals. Figure 1The connection relationships shown indicate that each CAN bus interface 17 includes two pins: a high pin (PH) and a low pin (PL). The numbers in the small rectangular boxes represent the pin numbers according to their respective pin definitions. For example, in the IPB_CAN bus interface, its second pin is connected to the eighteenth tap of the communication port CP in connection port 2, while its seventh pin is connected to the nineteenth tap of the communication port CP. An impedance matching resistor 6 is also connected in parallel between the high pin (PH) and the low pin (PL). This impedance matching resistor 6 is 120 ohms according to the general design of the CAN bus, used for termination matching to reduce signal reflection and interference.
[0042] In addition, the CAN bus interface 17 can also be connected to a control switch 13, which is used to control whether the CAN bus interface 17 is turned on. Preferably, the control switch 13 can be configured as a relay (especially a dual-channel relay) or a double-pole single-throw switch, wherein the first and second contacts of the control switch 13 are connected in series with the impedance matching resistor 6 and are respectively connected to one pin of the CAN bus interface 17, and the third and fourth contacts of the control switch 13 are respectively connected to the positive power supply line H and the negative power supply line L. By simultaneously turning on the first and second contacts through the control switch 13, the corresponding pins are connected to the corresponding CAN bus, thereby enabling the corresponding connected devices to communicate as CAN nodes.
[0043] In particular, the third and fourth contacts of the control switch 13 may also be connected in series with a first indicator light 9, which is used to indicate whether the corresponding CAN bus interface 13 is in working state according to the opening or closing of the control switch 13.
[0044] One of the five CAN bus interfaces 17 can be configured as an XETK module 18. Here, the XETK module has four pins, with two pins of the XETK module 18 connected to a tap pin. For example, the fourth pin of the XETK module 18 is connected to the forty-first tap pin of the communication port, and the fifth pin of the XETK module 18 is connected to the forty-second tap pin. Simultaneously, the other two pins of the XETK module 18, here the ninth and sixth pins, are connected to the positive power supply line H and the negative power supply line L, respectively, thereby powering the XETK module 18. Alternatively, the XETK module 18 may also be connected to a switch assembly 14 capable of simultaneously connecting the other two pins to the positive power supply line H and the negative power supply line L, the switch assembly activating a first indicator light 9 connected between the positive power supply line H and the negative power supply line L when closed.
[0045] exist Figure 1The power supply circuit 5 is marked with an irregular dashed box. The power supply circuit 5 includes a red positive power supply line H and a blue negative power supply line L, which are connected to different power supply pins 4 in the power supply port SP. Here, the power supply port SP may include two power supply pins 4, one of which, here the second power supply pin, is connected to the positive power supply line H, and the other power supply pin, here the eleventh pin, is connected to the negative power supply line L. Specifically, a main indicator light 11 is connected downstream of the main switch 15 between the positive power supply line H and the negative power supply line L.
[0046] For power supply, an external low-voltage power source is input via the positive input terminal InH and the negative input terminal InL. Downstream of the positive input terminal InH, a fuse F and a main switch S are connected in series in the positive power supply line H. Furthermore, a second indicator light 10 is connected between the positive power supply line H and the negative power supply line L; this second indicator light is used to indicate whether power is being supplied to the fault diagnosis box 1.
[0047] The power supply line may also be connected to a voltage measuring device 7 connected in parallel between the positive power supply line H and the negative power supply line L, and a current measuring device 8 connected in series between either the positive power supply line H or the negative power supply line L.
[0048] besides, Figure 1 It is also shown that a positive output terminal OutH is drawn from the positive power supply line H and a negative output terminal OutL is drawn from the negative power supply line L for supplying power to other devices.
[0049] To wake up the dormant power battery BA, the power supply port SP preferably includes a wake-up pin W. The wake-up pin W is connected to the positive power supply line H via a wake-up switch 16. With the main switch S and main switch 15 closed, a wake-up signal or wake-up pulse can be triggered by quickly switching the wake-up switch 16 once, thereby waking up the battery management system (BMS) and causing it to start accordingly. To indicate this wake-up operation, a wake-up indicator light 12 is connected downstream of the wake-up switch 16 between the positive power supply line H and the negative power supply line L.
[0050] Figure 2 This is a schematic diagram of the panel of the fault diagnosis box according to the present invention. The panel PN of the fault diagnosis box 1 can be disposed on... Figure 1 The circuit design of the fault diagnosis box 1 is shown. The fault diagnosis box 1 has a busbar CB leading out. One end of the busbar is connected to a COM port or a Harding port, such as a Harding port HT with over forty lines. The other end of the busbar is the connection port 2 of the fault diagnosis box 1, which includes a communication port CP and a power supply port SP. Thus, the connection port can connect to the battery management system (BMS) of the power battery BA via the busbar CB.
[0051] The panel PN is exemplarily provided with five CAN bus interfaces 17 circled in dashed lines, as well as first indicator lights 9 and control switches 13 corresponding to these CAN bus ports respectively. Here, the CAN bus interfaces 17 are preferably configured as Dsub9 interfaces or COM interfaces.
[0052] Below these CAN bus interfaces 17, the first indicator light 9, and the control switch 13, there is a display screen DP. This display screen DP is set to display the measured values of the device 7 for measuring voltage and the device 8 for measuring current, namely the measured voltage and the measured current.
[0053] Next to the display screen DP, there is a master switch S and its corresponding second indicator 10, a main switch 15 and its corresponding main indicator 11, and a wake-up switch 16 and its corresponding wake-up indicator 12.
[0054] Figure 3 This is a block diagram of a fault diagnosis system according to the present invention. The fault diagnosis system 100 for a power battery includes: a fault diagnosis box 1 for the power battery; a power battery BA, the battery management system (BMS) of which is connected to the fault diagnosis box 1 via a busbar CB; and a host computer HC, which communicates with the battery management system (BMS) of the power battery BA through the fault diagnosis box 1.
[0055] like Figure 3 As exemplified, a series of tests are required for a power battery (BA) not yet installed in a vehicle, including electrical performance testing, safety performance testing, environmental adaptability testing, lifespan testing, battery pack balancing testing, insulation resistance testing, electrical connection testing, and software and communication testing. The battery management system (BMS) of the power battery BA is a key component of battery safety and performance. It ensures safe and reliable operation by monitoring, managing, and protecting multiple battery functions. For example, the BMS can monitor key parameters such as battery voltage, current, temperature, SOC (State of Charge), and SOH (State of Health) in real time, performing charge / discharge management and balancing management to achieve protection functions and fault diagnosis for the power battery BA. The BMS includes a communication port for communication with external devices (such as the electric vehicle controller and charging stations).
[0056] like Figure 3 As shown, the fault diagnosis box 1 for the power battery is connected to the battery management system (BMS) of the power battery (BA) via a busbar (CB). The various CAN bus interfaces 17 provided on the fault diagnosis box 1 can be connected to one or more bus interface cards or CAN boxes via bus cables. Figure 3Two bus interface cards are illustrated: a first bus interface card VN1 and a second bus interface card VN2. The VECTOR VN1600 series can be used for the bus interface cards. The first bus interface card VN1 is connected to the host computer HC, for example, via an Ethernet cable ET, while the second bus interface card VN2 is connected to the host computer HC, for example, via a Universal Serial Bus cable USB. Thus, at least two CAN bus interfaces 17 of the fault diagnosis box 1 are configured to connect to the host computer HC, thereby transmitting CAN signals to and / or receiving commands from the host computer HC via the CAN bus interfaces 17.
[0057] The specific usage process of this utility model:
[0058] Connect the communication port 2 of the fault diagnosis box 1 to the battery management system (BMS) of the power battery BA. With the main switch S and main switch 15 closed, the BMS is started by quickly switching the wake-up switch 16 once. The main indicator light 11 illuminates when power is supplied to the BMS. At this time, the power supply circuit 5 can be judged as to whether it is working properly by observing the display screen showing the measurement data of the device used to measure current and / or the device used to measure voltage. Different control switches 13 are closed to select which CAN bus interface 17 to use for data transmission. The first indicator light 9 indicates which CAN bus interface can be connected to the corresponding bus. Subsequently, CAN bus signals can be acquired via CAN bus interface 17 or commands can be sent to the BMS via CAN bus interface, thereby enabling the diagnosis, recording, and coding of the power battery.
[0059] The above description represents the preferred embodiment of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. Therefore, this utility model is not limited to the illustrated embodiments, but includes or extends to all technical equivalents falling within the effective scope of the appended claims. The positional descriptions chosen in the specification, such as above, below, left, right, etc., refer to the direct description and the illustrated drawings, and can be adapted to new positions according to their meaning when the positions change.
[0060] List of reference numerals in the attached diagram:
[0061] 1 Fault Diagnosis Box
[0062] 2-port component
[0063] CP communication port
[0064] SP power supply port
[0065] 3-point connector pin
[0066] 4 power supply pins
[0067] 5 Power supply circuit
[0068] 6 Impedance matching resistors
[0069] 7. Devices for measuring voltage
[0070] 8. Devices for measuring current
[0071] 9 First indicator light
[0072] 10 Second indicator light
[0073] 11 Main indicator lights
[0074] 12 wake-up indicator lights
[0075] 13 Control Switch
[0076] 14 Switching Components
[0077] 15 main switches
[0078] 16 Wake-up Switch
[0079] 17 CAN bus interface
[0080] 18 XETK modules
[0081] PH pin (high)
[0082] PL pin (low)
[0083] H positive power supply line
[0084] L negative power supply line
[0085] InH positive input terminal
[0086] InL negative input terminal
[0087] F fuse
[0088] S main switch
[0089] OutH positive output terminal
[0090] OutL negative output terminal
[0091] W wake-up pin
[0092] DP display
[0093] PN panel
[0094] BA Power Battery
[0095] BMS Battery Management System
[0096] CB busbar
[0097] HC host computer
[0098] CC bus cable
[0099] ET Ethernet cable
[0100] USB Universal Serial Bus cable
Claims
1. A fault diagnosis box (1) for a power battery, characterized in that, The fault diagnosis box includes: A communication port (CP) configured to connect to the battery management system (BMS) of the power battery (BA) via a busbar (CB), the communication port (CP) having at least four tap pins (3) for connecting different CAN signals from the battery management system (BMS); At least two CAN bus interfaces (17), each CAN bus interface including two pins and an impedance matching resistor (6) connected between the two pins, the two pins being connected to two tap pins in the tap pins (3), the at least two CAN bus interfaces (17) being used to transmit one CAN signal respectively; A power supply port (SP) includes a power supply pin (4) for supplying power to the battery management system (BMS) via the busbar (CB); The power supply circuit (5) has two power supply lines, including a positive power supply line (H) and a negative power supply line (L), which are connected to the power supply pin (4).
2. The fault diagnosis box according to claim 1, characterized in that, The CAN signal includes at least two of the following: IPB_CAN signal, APPL_CAN signal, PTH_CAN signal, DC / DC_CAN signal, and XETK signal.
3. The fault diagnosis box according to claim 1 or 2, characterized in that, The CAN bus interface (17) is configured to connect to a host computer (HC) so as to transmit CAN signals to the host computer (HC) and / or receive instructions from the host computer (HC) via the CAN bus interface (17).
4. The fault diagnosis box according to claim 3, characterized in that, The CAN bus interface (17) is connected to the host computer (HC) via a bus interface card.
5. The fault diagnosis box according to claim 1 or 2, characterized in that, The power supply line is connected to a device (7) for measuring voltage and / or a device (8) for measuring current.
6. The fault diagnosis box according to claim 1 or 2, characterized in that, The CAN bus interface (17) is also connected to a control switch (13), which is used to control whether the CAN bus interface is turned on.
7. The fault diagnosis box according to claim 6, characterized in that, The control switch (13) is a relay or a double-pole single-throw switch. The first and second contacts of the control switch (13) are connected in series with an impedance matching resistor to one pin of the CAN bus interface, respectively. The third and fourth contacts of the control switch (13) are connected to the positive power supply line (H) and the negative power supply line (L), respectively.
8. The fault diagnosis box according to claim 7, characterized in that, The third and fourth contacts of the control switch (13) are also connected in series with a first indicator light (9), which is used to indicate whether the corresponding CAN bus interface (17) is in working state according to the opening or closing of the control switch (13).
9. The fault diagnosis box according to claim 1 or 2, characterized in that, A second indicator light (10) is also connected between the positive power supply line (H) and the negative power supply line (L). The second indicator light is used to indicate whether the fault diagnosis box (1) is powered.
10. The fault diagnosis box according to claim 1 or 2, characterized in that, The power supply port (CP) includes two power supply pins (4), one of which is connected to the positive power supply line (H), and the other of which is connected to the negative power supply line (L).
11. The fault diagnosis box according to claim 10, characterized in that, A main switch (15) is connected to the positive power supply line (H) leading to one of the power supply pins.
12. The fault diagnosis box according to claim 10, characterized in that, The power supply port (SP) also includes a wake-up pin (W), which is connected to the positive power supply line (H) via a wake-up switch (16).
13. The fault diagnosis box according to claim 11 or 12, characterized in that, A main indicator light (11) is connected downstream of the main switch (15) between the positive power supply line (H) and the negative power supply line (L); and / or a wake-up indicator light (12) is connected downstream of the wake-up switch (16) between the positive power supply line (H) and the negative power supply line (L).
14. The fault diagnosis box according to claim 1 or 2, characterized in that, The fault diagnosis box (1) has five CAN bus interfaces (17).
15. The fault diagnosis box according to claim 1 or 2, characterized in that, The CAN bus interface (17) is configured as an XETK module (18). The XETK module has four pins. Two of the pins of the XETK module (18) are connected to a tap pin, and the other two pins of the XETK module (18) are connected to the positive power supply line (H) and the negative power supply line (L), respectively, so as to supply power to the XETK module (18).
16. The fault diagnosis box according to claim 15, characterized in that, The XETK module (18) is also connected to a switch assembly (14) that can simultaneously connect the other two pins to the positive power supply line (H) and the negative power supply line (L), respectively. When closed, the switch assembly turns on the first indicator light connected between the positive power supply line (H) and the negative power supply line (L).
17. A fault diagnosis system for power batteries, characterized in that, The fault diagnosis system includes: Fault diagnosis box for power batteries according to any one of claims 1 to 16; A power battery (BA), wherein the battery management system (BMS) of the power battery is connected to a fault diagnosis box (1) via a busbar (CB); and The host computer (HC) is used to communicate with the battery management system (BMS) of the power battery (BA) through the fault diagnosis box (1).