Battery system bus in vehicle and vehicle

Abstract

The utility model provides a battery system bus in a vehicle and the vehicle. According to the battery system bus in the vehicle and the vehicle, M bus switching modules and N battery monitoring modules are arranged on the battery system bus; wherein at least one battery monitoring module in the N battery monitoring modules is arranged between the adjacent bus switching modules; m and N are positive integers greater than 0; wherein signals are transmitted between the battery monitoring module and the battery management system on the battery system bus through the bus exchange module. According to the battery system bus in the vehicle and the vehicle, the stability of signal transmission of the battery system bus is improved.

Description

Technical Field

[0001] This application relates to the fields of vehicle technology and communication, and more particularly to a battery system bus in a vehicle and the vehicle itself. Background Technology

[0002] The power source in new energy vehicles is a battery pack, which consists of multiple batteries. New energy vehicles typically have a battery management system to monitor the operating status of each battery in the battery pack.

[0003] In some technologies, the battery management system (BMS) is externally connected to a battery system bus, and the battery monitoring modules corresponding to each battery are connected to the battery system bus. The BMS then transmits signals to these battery monitoring modules via the battery system bus. However, in these technologies, signal attenuation and interference occur during signal transmission through the battery system bus, resulting in poor stability of the bus transmission.

[0004] Therefore, there is an urgent need for a solution that can improve the stability of battery system bus signal transmission. Utility Model Content

[0005] This application provides a battery system bus in a vehicle and a vehicle, for improving the stability of battery system bus signal transmission.

[0006] On one hand, this application provides a battery system bus in a vehicle, wherein M bus switching modules and N battery monitoring modules are provided on the battery system bus; wherein at least one of the N battery monitoring modules is provided between adjacent bus switching modules; M and N are both positive integers greater than 0;

[0007] The battery monitoring module and the battery management system on the battery system bus transmit signals through a bus exchange module.

[0008] In one possible implementation, the signal between the battery management system and the battery monitoring module passes through various bus exchange modules located between the battery management system and the battery monitoring module.

[0009] In one possible implementation, the bus switching module includes a controller and a filter, with the controller connected to the filter; wherein the controller is used to forward signals, and the filter is used to filter out noise in the transmitted signals.

[0010] In one possible implementation, the controller is provided with a grounding wire; the grounding wires in each bus switching module are connected to the same grounding point.

[0011] In one possible implementation, the battery system bus is connected to the main power supply and the backup power supply respectively;

[0012] The bus switching module also includes an operational amplifier; one input of the operational amplifier is connected to the main power supply via the battery system bus, the other input of the operational amplifier is connected to the backup power supply via the battery system bus, and the output of the operational amplifier is connected to the controller.

[0013] The operational amplifier is used to send a power switching signal to the controller, so that the controller switches from the main power supply to the backup power supply.

[0014] In one possible implementation, a terminating resistor is provided on the battery system bus.

[0015] In one possible implementation, the battery system bus includes M+1 sub-bus segments;

[0016] One end of the i-th bus switching module is connected to the i-th sub-bus segment, and the other end of the i-th bus switching module is connected to the (i+1)-th sub-bus segment; where i is a positive integer greater than 0 and less than or equal to M.

[0017] In one possible implementation, the sub-bus segment includes a low-level bus and a high-level bus.

[0018] In one possible implementation, at least one bus switching module has a metal housing.

[0019] On the other hand, this application provides a vehicle that includes the battery system bus as described above.

[0020] The battery system bus and vehicle provided in this application are configured with multiple bus exchange modules and multiple battery monitoring modules on the battery system bus, and at least one battery monitoring module is set in an adjacent bus exchange module on the bus. Data transmission between the battery management system and the battery monitoring module on the bus is realized through the bus exchange modules. In the process of signal transmission between the two, the signal is transmitted through each bus exchange module, which shortens the bus length traversed in one signal transmission process, thereby improving the signal transmission stability of the battery system bus. Attached Figure Description

[0021] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0022] Figure 1 Schematic diagram of the battery system bus provided in this application Figure 1 ;

[0023] Figure 2 Schematic diagram of the battery system bus provided in this application Figure 2 ;

[0024] Figure 3 A schematic diagram of the structure of an exemplary bus switching module Figure 1 ;

[0025] Figure 4 A schematic diagram of the structure of an exemplary bus switching module Figure 2 ;

[0026] Figure 5 Schematic diagram of the battery system bus provided in this application Figure 3 ;

[0027] Figure 6 This is a schematic diagram illustrating the division of a sub-bus segment;

[0028] Figure 7 Schematic diagram of the battery system bus provided in this application Figure 4 .

[0029] Explanation of reference numerals in the attached figures:

[0030] 101: Bus switching module; 1011: Controller; 1012: Filter; 1013: Operational amplifier; 102: Battery monitoring module; 103: Battery management system; 104: Termination resistor.

[0031] The accompanying drawings have illustrated specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to specific embodiments. Detailed Implementation

[0032] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0033] First, let me explain the terms used in this application:

[0034] Battery system bus: This refers to the Controller Area Network (CAN) bus used in the battery management system. It can also be called the battery system bus or battery CAN bus. The battery CAN bus connects the battery management system and the battery monitoring modules of each battery, enabling data and signal transmission between the battery management system and the monitoring modules.

[0035] Battery Management System (BMU): Also known as Battery Management Unit, it is mainly responsible for monitoring, controlling, and protecting the battery pack through the battery monitoring module to ensure the safe and efficient operation of the battery pack.

[0036] Battery monitoring module: also known as battery monitoring unit (CMU), is responsible for accurately collecting basic parameters of the battery such as voltage, current, and temperature, and transmitting these data to the battery management system.

[0037] Bus switching module: Used to segment the battery system bus and to perform signal denoising and forwarding.

[0038] The power source in new energy vehicles is the electrical energy provided by the battery pack. New energy vehicles typically have a battery management system (BMS) to monitor the operating status of each battery in the pack. Through an external battery system bus, the BMS can connect to the corresponding battery monitoring modules, enabling signal transmission between the BMS and the monitoring modules.

[0039] In some embodiments, new energy buses employ a multi-regional battery layout to improve driving range. This results in an excessively long battery system bus between the battery management system and the battery monitoring module. A longer battery system bus can lead to signal attenuation, reflection interference, and electromagnetic interference, resulting in poor transmission stability.

[0040] To address the aforementioned technical problems, this application provides a battery system bus in a vehicle and a vehicle in general. The battery system bus is equipped with multiple bus switching modules and multiple battery monitoring modules, with at least one battery monitoring module located in each adjacent bus switching module. Data transmission between the battery management system and the battery monitoring modules on the bus is achieved through the bus switching modules. During signal transmission between the two, signals are transmitted through each bus switching module, shortening the bus length traversed in a single signal transmission and thus improving the signal transmission stability of the battery system bus.

[0041] The technical solution of this application and how it solves the above-mentioned technical problems will be described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will be described below with reference to the accompanying drawings.

[0042] Figure 1 Schematic diagram of the battery system bus provided in this application Figure 1 .like Figure 1 As shown, the battery system bus is equipped with M bus switching modules 101 and N battery monitoring modules 102; wherein, at least one of the N battery monitoring modules 102 is arranged between adjacent bus switching modules 101. M and N are both positive integers greater than 0.

[0043] The battery monitoring module 102 and the battery management system 103 on the battery system bus transmit signals through the bus exchange module 101.

[0044] For example, at least one bus switching module and at least one battery monitoring module are provided on the battery system bus. The bus switching module can be installed on the battery bracket on the roof or on other structural components in the vehicle. Each battery monitoring module is installed in the chassis, rear compartment, or roof, etc., along with the individual batteries in the battery pack.

[0045] It should be noted that, Figure 1 The battery system bus shown, when M is 1 and N is 4, is as follows: Figure 1 The battery system bus shown has one bus exchange module, and two battery monitoring modules are connected between the battery management system and the bus exchange module. Two battery monitoring modules are also connected to the right side of the bus exchange module.

[0046] exist Figure 1 In the battery system bus shown, the battery monitoring modules are labeled from left to right. The battery management system (BMS) directly transmits signals to the first and second battery monitoring modules; the BMS transmits signals to the third and fourth battery monitoring modules via a bus exchange module. That is, the BMS sends a signal to the bus exchange module, which then forwards the signal to either the third or fourth battery monitoring module.

[0047] Correspondingly, when the third and fourth battery monitoring modules send their signals to the battery management system, they need to go through the bus exchange module. That is, the third battery monitoring module sends the signal to the bus exchange module, which then sends the signal to the battery management system; the process for the fourth battery monitoring module is similar.

[0048] It should be noted that, Figure 1 This diagram illustrates the structure of a battery system bus only. It does not represent a limitation on the number of bus exchange modules or the number of battery monitoring modules.

[0049] Figure 2 Schematic diagram of the battery system bus provided in this application Figure 2 .like Figure 2 As shown, when M is 2 and N is 5, the bus exchange modules are numbered from left to right. The bus exchange module closest to the battery management system is designated as the first bus exchange module, and the bus exchange module to the right of the first bus exchange module is designated as the second bus exchange module.

[0050] The battery monitoring modules are labeled in order from left to right.

[0051] Between the battery management system and the first bus exchange module, two battery monitoring modules are connected via the battery system bus. Between the first and second bus exchange modules, two more battery monitoring modules are connected via the battery system bus. To the right of the second bus exchange module, one more battery monitoring module is connected via the battery system bus. It should be noted that there is no limit to the number of battery monitoring modules connected between adjacent bus exchange modules, but at least one battery monitoring module must be connected.

[0052] The battery management system transmits signals directly between itself and the first battery monitoring module, as well as between itself and the second battery monitoring module; the battery management system transmits signals between itself and the third battery monitoring module, as well as between itself and the fourth battery monitoring module, through the first bus exchange module; and the battery management system transmits signals between itself and the fifth battery monitoring module through both the first and second bus exchange modules.

[0053] The battery system bus provided in this application embodiment includes one or more bus switching modules, and the signal transmission between the battery monitoring module and the battery management system requires signal forwarding through the bus switching modules. By including bus switching modules in the battery system bus, the physical length of the bus traversed for each signal transmission is shortened, thereby improving signal attenuation during signal transmission. Furthermore, the shortened physical length of the bus reduces the possibility of interference, thus improving the signal transmission stability of the battery system bus.

[0054] Based on the aforementioned embodiments, when multiple bus exchange modules are provided in the battery system bus, the signal transmission between the battery monitoring module and the battery management system needs to go through the bus exchange modules.

[0055] In one example, the signal between the battery management system and the battery monitoring module passes through various bus exchange modules located between the battery management system and the battery monitoring module.

[0056] For example, in combination Figure 2 To explain. For example... Figure 2 As shown, the battery system bus is equipped with 2 bus switching modules and 5 battery monitoring modules. Figure 2 The communication between the fifth battery monitoring module and the battery management system will be explained.

[0057] When the battery management system transmits signals to the fifth battery monitoring module, it first sends the signal to the first bus exchange module, which then forwards the signal to the second bus exchange module, which in turn forwards the signal to the fifth battery monitoring module.

[0058] Correspondingly, when the fifth battery monitoring module transmits signals to the battery management system, it first sends the signal to the second bus exchange module, which then forwards the signal to the first bus exchange module, which in turn forwards the signal to the battery management system.

[0059] In the above example, when the battery system bus is long, multiple bus switching modules can be set on the battery system bus. Each battery monitoring module, during signal transmission with the battery management system, needs to pass through all the bus switching modules between them. This avoids signal interference and signal attenuation caused by excessively long bus distances during a single signal transmission. Signal forwarding based on multiple bus switching modules ensures that the signal transmission distance within the bus is not excessive, further improving the signal transmission stability of the battery system bus.

[0060] Based on the foregoing embodiments, the structure of the bus switching module will be further explained.

[0061] Figure 3 A schematic diagram of the structure of an exemplary bus switching module Figure 1 .like Figure 3 As shown, in one example, the bus switching module 101 includes a controller 1011 and a filter 1012, with the controller 1011 connected to the filter 1012. The controller 1011 is used to forward signals, and the filter 1012 is used to filter out noise from the transmitted signals.

[0062] For example, each bus switching module in the battery system bus configuration may include a controller and a filter, and the controller is connected to the filter. The controller is used to receive and forward signals.

[0063] Specifically, the controller can parse the received signal and extract the Arbitration ID, data field, and Cyclic Redundancy Check (CRC) code. The Arbitration ID is a crucial part of the battery system bus transmission signal, serving as its identifier; the data field contains the actual information to be transmitted in the battery system bus transmission signal; and the CRC code is used to detect errors in the battery system bus transmission signal.

[0064] The controller can determine the target address of the signal based on the arbitration ID and send the signal to the bus switching module corresponding to the target address, or to the battery monitoring module corresponding to the target address.

[0065] Optionally, the controller can perform error detection on the signal. If an error signal is detected, the controller can process the error signal according to the CAN protocol, including but not limited to: sending an error frame or ignoring the error signal.

[0066] Optionally, the controller can also ensure consistent communication timing between the various bus switching modules based on a synchronization clock signal.

[0067] The filter is used to suppress noise in the signals of the battery system bus.

[0068] In the example above, a controller is configured in the bus switching module for signal forwarding and reception, and a filter is configured to remove noise from the signals. This enables signal forwarding between the battery management system and the battery monitoring module, as well as noise suppression of signals in the battery system bus. Furthermore, the controller can perform error detection and verification, improving the reliability of signal transmission in the battery system bus.

[0069] Building upon the aforementioned example, in one example, a grounding wire is provided on the controller; the grounding wires in each bus switching module are connected to the same grounding point.

[0070] For example, each controller in the bus switching module is equipped with a grounding wire, which connects the controller to the ground or a grounding system. The grounding wires of the controllers of all bus switching modules are reliably grounded at the same common grounding point.

[0071] Optionally, this common grounding point can be located at the metal busbar conductor used for grounding in the battery compartment, and this common grounding point can be a star grounding point. A star grounding point means that all devices or circuits that need to be grounded are connected to a common grounding point, forming a star structure.

[0072] In the example above, the grounding wires of each bus switching module are connected to the same common grounding point for reliable grounding, which avoids potential differences caused by connecting multiple grounding points. This further improves the signal transmission reliability of the battery system bus.

[0073] exist Figure 3 Based on the example shown, Figure 4 A schematic diagram of the structure of an exemplary bus switching module Figure 2 In one example, the battery system bus is connected to both the main power supply and the backup power supply.

[0074] like Figure 4 As shown, the bus switching module 101 also includes an operational amplifier 1013; one input terminal of the operational amplifier 1013 is connected to the main power supply through the battery system bus, the other input terminal of the operational amplifier 1013 is connected to the backup power supply through the battery system bus, and the output terminal of the operational amplifier 1013 is connected to the controller 1011.

[0075] Operational amplifier 1013 is used to send a power switching signal to controller 1011 so that controller 1011 switches from main power supply to backup power supply.

[0076] For example, the battery system bus is also connected to a main power supply and a backup power supply. The main power supply powers the various bus switching modules; the backup power supply can be a supercapacitor bank, used for emergency power supply when the main power supply voltage is unstable.

[0077] Specifically, the bus switching module includes an operational amplifier. One input of this operational amplifier is connected to the main power supply via the battery system bus; the other input is connected to the backup power supply via the battery system bus. The output of the operational amplifier is connected to the controller of the bus switching module.

[0078] When the operational amplifier detects a drop in the main power supply voltage or an instability in the main power supply voltage, it sends a power switching signal to the controller through its output terminal. In response to this power switching signal, the controller switches from the main power supply to the backup power supply.

[0079] In the above example, the bus switching module supports dual power input. In the event of a main power failure or voltage drop, it can be powered by a backup power source to maintain operation for a period of time. This improves the operational stability of the bus switching module, thereby further enhancing the signal transmission stability and security of the battery system bus.

[0080] Building upon the aforementioned embodiments, by shortening the physical length of the battery system bus in a single signal transmission, signal attenuation and signal interference on the battery system bus can be reduced. To further improve the stability of signal transmission on the battery system bus, in one example, a terminating resistor is provided on the battery system bus.

[0081] Figure 5 Schematic diagram of the battery system bus provided in this application Figure 3 .like Figure 5 As shown, in Figure 2 Based on the example shown, a terminating resistor 104 is set on the right side of the 5th battery monitoring module, at the end of the battery system bus.

[0082] Optionally, a terminating resistor can be set at the connection between the battery management system and the battery system bus. Optionally, the resistance value of the terminating resistor can be 120Ω.

[0083] In the battery system bus, the terminating resistor serves the following functions:

[0084] (1) As the signal is transmitted in the battery system bus, it will be reflected when it reaches the end of the bus, resulting in a reflected signal. If the reflected signal is superimposed on the original signal, it will cause the signal to be distorted. Since the terminating resistor is set at one or both ends of the battery system bus, the signal is completely absorbed when it reaches the end of the bus, thereby eliminating the reflection and ensuring the signal quality.

[0085] (2) The terminating resistor can stabilize the signal level on the bus within a suitable range.

[0086] (3) By using a terminating resistor to eliminate signal reflection, the intensity of electromagnetic interference can be effectively reduced, thus reducing electromagnetic compatibility issues with other devices.

[0087] In the example above, setting a terminating resistor on the battery system bus can eliminate signal reflections on the battery system bus, further improve the signal transmission stability of the battery system bus, and also reduce electromagnetic interference.

[0088] In one example, the battery system bus includes M+1 sub-bus segments.

[0089] One end of the i-th bus switching module is connected to the i-th sub-bus segment, and the other end of the i-th bus switching module is connected to the (i+1)-th sub-bus segment; where i is a positive integer greater than 0 and less than or equal to M.

[0090] For example, the battery system bus can be divided into multiple sub-bus segments. As can be seen from the foregoing embodiments, M bus switching modules can be configured on the battery system bus. Correspondingly, adjacent bus switching modules require one sub-bus segment connection, the first bus switching module requires one sub-bus segment connection to the battery management system, and the Mth bus switching module requires one sub-bus segment connection to the terminating resistor. Therefore, the number of sub-bus segments should be M+1.

[0091] Figure 6 This is a schematic diagram illustrating the division of an exemplary sub-bus segment, such as... Figure 6 As shown, taking the i-th bus switching module as an example, one end of the i-th bus switching module is connected to the i-th sub-bus segment, and the other end of the i-th bus switching module is connected to the (i+1)-th sub-bus segment. Here, i is a positive integer greater than 0 and less than or equal to M.

[0092] Optionally, the battery system bus can be divided into M+1 sub-bus segments. The specific value of M+1 can be determined based on the physical length of the original battery system bus and the baud rate of the signal transmission.

[0093] In one example, the number of sub-bus segments can be calculated using the following formula:

[0094]

[0095] In the formula, This represents the number of sub-bus segments, which is M+1 as mentioned above; This represents the floor function; Indicates the overall length of the primary battery system bus; The baud rate indicates the signal transmission rate, measured in bps (bits per second), which is the number of bits transmitted per second.

[0096] In the example above, dividing the battery system bus into multiple sub-bus segments can physically shorten the bus length. Each signal is transmitted within a sub-bus segment, resulting in a shorter transmission path, reduced signal attenuation, and improved signal transmission stability of the battery system bus.

[0097] Figure 7 Schematic diagram of the battery system bus provided in this application Figure 4 .like Figure 7 As shown in one example, the sub-bus segment includes a low-level bus and a high-level bus.

[0098] For example, each sub-bus segment includes a low-level bus (CANL) and a high-level bus (CANH).

[0099] Differential signal transmission is possible across the various sub-buses of the battery system bus based on low-level and high-level buses. A differential signal is a signal that represents the state through the voltage difference between the low-level and high-level buses.

[0100] It should be noted that when the (M+1)th sub-bus segment is connected to the terminating resistor, the low-level bus is connected to one end of the terminating resistor, and the high-level bus is connected to the other end of the terminating resistor.

[0101] Optionally, the low-level bus and high-level bus can be twisted together to form a twisted-pair structure. The low-level bus and high-level bus are twisted with a specific twist pitch to obtain the twisted-pair structure. The twist pitch can be from 4 twists per inch to 6 twists per inch. This can further improve the electromagnetic interference immunity of each sub-bus segment, thereby improving the stability of the overall battery system bus signal transmission.

[0102] In the example above, each sub-bus segment is equipped with a low-level bus and a high-level bus, which enables the transmission of differential signals. Transmitting signals through differential signals can improve the anti-interference capability of signal transmission.

[0103] Based on any of the foregoing examples, in one example, at least one bus switching module has a metal casing.

[0104] For example, each bus switching module has a metal casing. The metal casing can prevent the intrusion of external electromagnetic waves and reduce the impact of external interference on the internal circuitry. The casing material of each bus switching module can be any of the following: aluminum alloy, copper alloy, unmodified alloy, iron-nickel alloy, etc.

[0105] Among them, aluminum alloy shells are lightweight, high-strength, and corrosion-resistant, making them suitable for applications where weight is a concern and the electromagnetic interference environment is not particularly harsh; copper alloy shells have good electrical and thermal conductivity, and excellent electromagnetic shielding performance, often used in applications with high electromagnetic shielding requirements and where weight and cost are not critical; stainless steel shells have extremely high strength and hardness, and excellent corrosion resistance, making them suitable for applications in harsh industrial environments where corrosion resistance and strength are critical; iron-nickel alloy shells have high magnetic permeability, effectively absorbing and attenuating electromagnetic waves, resulting in significant electromagnetic shielding, and are often used in applications with strict electromagnetic shielding requirements, especially for applications with high requirements for shielding low-frequency electromagnetic waves.

[0106] In the above example, by installing metal casings on each bus switching module, the bus switching module's ability to resist external electromagnetic interference can be further improved, protecting the controller, filters, and other possible electronic components inside the bus switching module. This also improves the operational stability of the bus switching module, and based on a stable bus switching module, further enhances the stability of signal transmission on the battery system bus.

[0107] The battery system bus provided in this application embodiment has multiple bus switching modules and multiple battery monitoring modules on it, and at least one battery monitoring module is set in an adjacent bus switching module on the bus. Through the bus switching modules, data transmission between the battery management system and the battery monitoring module on the bus is realized. In the process of signal transmission between the two, the signal is transmitted through each bus switching module, which shortens the bus length traversed during signal transmission and thus improves the signal transmission stability of the battery system bus.

[0108] This application also provides a vehicle that includes a battery system bus as provided in any of the foregoing embodiments.

[0109] The vehicle, based on the battery system bus provided in any of the foregoing embodiments, can improve the signal transmission stability of the battery system bus in the vehicle. The specific implementation structure, implementation process, and corresponding technical effects of the battery system bus in the vehicle can be found in the explanations of the foregoing embodiments, and will not be elaborated upon here.

[0110] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the utility models disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this application are indicated by the following claims.

[0111] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A battery system bus in a vehicle, characterized by, The battery system bus is equipped with M bus switching modules and N battery monitoring modules; wherein, at least one of the N battery monitoring modules is set between adjacent bus switching modules; M and N are both positive integers greater than 0. The battery monitoring module and the battery management system on the battery system bus transmit signals through the bus exchange module.

2. The battery system bus of claim 1, wherein, The signal between the battery management system and the battery monitoring module passes through each bus exchange module located between the battery management system and the battery monitoring module.

3. The battery system bus of claim 1, wherein, The bus switching module includes a controller and a filter, wherein the controller is connected to the filter; wherein the controller is used to forward signals, and the filter is used to filter out noise in the transmitted signals.

4. The battery system bus of claim 3, wherein, The controller is equipped with a grounding wire; the grounding wires in each of the bus switching modules are connected to the same grounding point.

5. The battery system bus of claim 3, wherein, The battery system bus is connected to the main power supply and the backup power supply respectively; The bus switching module also includes an operational amplifier; one input terminal of the operational amplifier is connected to the main power supply via the battery system bus, the other input terminal of the operational amplifier is connected to the backup power supply via the battery system bus, and the output terminal of the operational amplifier is connected to the controller; The operational amplifier is used to send a power switching signal to the controller, so that the controller switches from the main power supply to the backup power supply.

6. The battery system bus of claim 1, wherein, The battery system bus is equipped with a terminating resistor.

7. The battery system bus according to claim 1, characterized in that, The battery system bus includes M+1 sub-bus segments; One end of the i-th bus switching module is connected to the i-th sub-bus segment, and the other end of the i-th bus switching module is connected to the (i+1)-th sub-bus segment; where i is a positive integer greater than 0 and less than or equal to M.

8. The battery system bus of claim 7, wherein, The sub-bus segment includes a low-level bus and a high-level bus.

9. The battery system bus of any one of claims 1-8, wherein, The at least one bus switching module has a metal casing.

10. A vehicle characterized by comprising: The vehicle includes a battery system bus as described in any one of claims 1-9.

Images