Vehicle battery management system, data collection method, device and vehicle

Abstract

This invention provides a vehicle battery management system, a data acquisition method, an apparatus, and a vehicle. The system includes: a power supply module, comprising a low-voltage power supply unit and a high-voltage power supply unit, for supplying power to the battery management system; a power management circuit for monitoring the power failure status of the low-voltage battery in the low-voltage power supply unit and determining whether to switch the power supply to the battery management system; and a data processing module for detecting the power battery pack in the high-voltage power supply unit, obtaining and storing first battery data. If the low-voltage battery does not fail to power, the low-voltage power supply unit is maintained as the power supply, and the first battery data under low-voltage power supply is obtained. If the low-voltage battery fails to power, the power supply is switched to the high-voltage power supply unit, and the first battery data under high-voltage power supply is obtained. This invention enables the battery management system to continue operating normally after the low-voltage battery fails to power, improving the reliability of the battery management system while preventing battery data loss.

Description

Technical Field

[0001] This invention relates to the field of battery management technology, specifically to a vehicle battery management system, data acquisition method, device, and vehicle. Background Technology

[0002] With the development of new energy technologies, electric vehicles are being used more and more widely. For example, passenger cars, logistics vehicles, communication vehicles, and special-purpose vehicles are all starting to use power batteries as their power source, meeting the power requirements for vehicle operation while reducing environmental pollution and damage. As one of the most important components of an electric vehicle, the power battery is very expensive. To prevent power battery failure, electric vehicles need to use a BMS (Battery Management System) to monitor and manage the power battery. In related technologies, the low-voltage battery in the electric vehicle is usually used as the power source to maintain normal operation. However, when using battery swapping technology to charge the power battery (i.e., replacing the power battery), because the battery management system and the power battery are integrated, the power battery will be disconnected from the vehicle. Alternatively, if the low-voltage battery fails, the battery management system will lose power, resulting in the loss of battery data obtained before the power loss. Furthermore, before the low-voltage battery resumes power supply, there is a vacuum in the battery management system's management of the power battery, leading to low stability in the operation of the battery management system.

[0003] Chinese patent CN105958629A discloses a BMS power supply device and method for electric vehicles, adding an emergency power supply to the electric vehicle. If the battery management system experiences a power outage, the emergency power supply provides power to ensure the battery management system functions normally. However, this solution is not suitable for situations where the power battery is directly detached from the vehicle body when using battery swapping technology. Chinese patent CN108206550A discloses a high-voltage lithium battery BMS power supply circuit, utilizing a high-voltage lithium battery to power the battery management system. However, while this solution ensures uninterrupted power to the battery management system, continuously using the power battery as the power source increases wear and tear on the power battery, affecting its lifespan. Furthermore, the lack of complete isolation between high and low voltage levels poses a safety hazard.

[0004] Therefore, improving the reliability of the battery management system so that it can continue to function normally after the low-voltage battery is de-energized, thus ensuring the integrity of the battery data obtained when testing the power battery, is an urgent problem to be solved. Summary of the Invention

[0005] In view of the shortcomings of the prior art described above, the present invention provides a vehicle battery management system, a data acquisition method, a device, and a vehicle to solve at least one of the above-mentioned technical problems.

[0006] In a first aspect, the present invention provides a vehicle battery management system, comprising: a power supply module, a power management module, and a data processing module; the power supply module includes a low-voltage power supply unit and a high-voltage power supply unit, respectively used to supply power to the battery management system; the power management circuit is connected to the power supply module and is used to monitor the power failure status of the low-voltage battery in the low-voltage power supply unit, and determine whether to switch the power supply of the battery management system based on the monitoring results; the data processing module is connected to the power management circuit and is used to detect the power battery pack in the high-voltage power supply unit, obtain and store first battery data, wherein if the low-voltage battery does not fail to power, the low-voltage power supply unit is maintained as the power supply of the battery management system, and the first battery data under low-voltage power supply is obtained; if the low-voltage battery fails to power, the power supply of the battery management system is switched to the high-voltage power supply unit, and the first battery data under high-voltage power supply is obtained.

[0007] In one embodiment of the present invention, the system further includes: a secondary power supply circuit connected to the power supply module, used to convert the current output by the power supply module to supply power to the data processing module according to the converted current; wherein, if the secondary power supply module is powered by the low-voltage power supply unit, the first low-voltage current output by the low-voltage power supply unit is regulated, filtered, and rectified to obtain a second low-voltage current; if the secondary power supply module is powered by the high-voltage power supply unit, the first high-voltage current output by the high-voltage power supply unit is regulated, filtered, and rectified to obtain a second high-voltage current, and high-low voltage isolation is provided between the low-voltage power supply unit and the high-voltage power supply unit.

[0008] In one embodiment of the present invention, the high-voltage power supply unit includes: a power battery pack, a transformer drive circuit, a transformer, and a first switch; the first switch is used to connect the power battery pack to the transformer drive circuit and the power management circuit respectively; the power battery pack is connected to the first switch and is used to supply power to the transformer drive circuit; the transformer drive circuit is connected to the power battery pack and is used to generate a drive signal to control the operation of the transformer; the transformer is used to step down the current output by the power battery pack according to the drive signal to obtain a first high-voltage current, and to supply power to the power management circuit and the secondary power supply circuit through the first high-voltage current.

[0009] In one embodiment of the present invention, the low-voltage power supply unit includes: a low-voltage battery, a primary power supply current, and a second switch; the low-voltage battery is used to supply power to the primary power supply circuit; the primary power supply circuit is connected to the low-voltage battery and is used to step down the current output by the low-voltage battery to obtain a first low-voltage current, and to supply power to the power management circuit through the first low-voltage current; the second switch has one end connected to the low-voltage battery and the other end connected to the current management circuit, and is used to connect the low-voltage battery to the power management circuit, so that the power management circuit obtains second battery data of the low-voltage battery and determines the power failure status of the low-voltage battery based on the second battery data.

[0010] In one embodiment of the present invention, the data processing module includes: a battery detection circuit connected to the power battery pack, used to detect the physical parameters of each battery cell in the power battery pack, the physical parameters including the voltage, current and temperature of the battery cell, the battery detection circuit being powered by the power battery pack; a control circuit connected to the battery detection circuit, used to detect the power battery according to the physical parameters of all the battery cells in the power battery pack, obtain first battery data of the power battery pack, and determine whether the first battery data is abnormal, wherein the detection of the power battery includes insulation detection, equalization detection and total voltage detection, the control circuit being powered by the secondary power supply circuit; and a storage circuit connected to the control circuit, used to store the battery information of the power battery pack obtained by the detection unit, the storage circuit being powered by the secondary power supply circuit.

[0011] In one embodiment of the present invention, the system further includes: a collision detection circuit connected to the control circuit, used to detect a collision signal of the vehicle, the collision signal being sent to the power management circuit through the control circuit.

[0012] In one embodiment of the present invention, the power management circuit further includes: a first switching unit, configured to switch the secondary power supply circuit from being powered by the first low-voltage current to being powered by the first high-voltage current if the second switch is in an open state; wherein, if the second switch is in an open state, a first switching command is generated and sent to the control circuit; if a first feedback signal carrying normal first battery data is received from the control circuit, the secondary power supply circuit is switched from being powered by the first low-voltage current to being powered by the first high-voltage current, so that the output of the second low-voltage current of the secondary power supply circuit is converted into the second high-voltage current; if a first feedback signal carrying abnormal first battery data is received from the control circuit, power supply to the battery management system is stopped.

[0013] In one embodiment of the present invention, the power management circuit further includes: a second switching unit, configured to switch the secondary power supply circuit from being powered by the first low-voltage current to being powered by the first high-voltage current if the collision signal is abnormal or the low-voltage battery fails to power; wherein, if the first battery data is normal, a second switching command is generated and sent to the control circuit; if a second feedback information carrying the collision signal or the second battery data is still abnormal is received from the control circuit within a preset time, the secondary power supply circuit is switched from being powered by the first low-voltage current to being powered by the first high-voltage current, so that the output of the second low-voltage current of the secondary power supply circuit is converted into the second high-voltage current; if no second feedback information carrying the collision signal or the second battery data is still abnormal is received from the control circuit within a preset time, the secondary power supply circuit is kept powered by the first low-voltage current.

[0014] In one embodiment of the present invention, the power management circuit further includes: a third switching unit, configured to switch the secondary power supply circuit from being powered by the first high-voltage current to being powered by the first low-voltage current; wherein, a third switching instruction is generated and sent to the control circuit; if a third feedback information carrying the low-voltage battery not losing power is received from the control circuit, then the low-voltage battery is powered normally, and the secondary power supply circuit is switched from being powered by the first high-voltage current to being powered by the first low-voltage current, so that the output of the secondary power supply circuit is converted from the second high-voltage current to the second low-voltage current; if a third feedback information carrying the low-voltage battery losing power is received from the control circuit, then the low-voltage battery is powered abnormally, and the secondary power supply circuit is kept powered by the first high-voltage circuit.

[0015] In one embodiment of the present invention, the system further includes: a clock circuit connected to the control circuit, used to record the switching time between the low-voltage power supply unit and the second power supply unit, and to store the switching time in the storage circuit via the control circuit; the clock circuit is powered by the secondary power supply circuit; a communication circuit connected to the primary power supply circuit and the control circuit respectively, used to send the second battery information stored in the storage circuit and the switching time to the vehicle infotainment system in the vehicle via the control circuit; the communication circuit is powered by the primary power consumption circuit; and a peripheral control circuit connected to the primary power supply circuit, used to control the external devices of the battery management system; the peripheral control circuit is powered by the primary power supply circuit.

[0016] In a second aspect, the present invention also provides a data acquisition method for a vehicle battery management system, comprising: detecting the power supply status of a low-voltage battery in the vehicle to determine whether the low-voltage battery is de-energized, wherein the low-voltage battery is used to supply power to the vehicle battery management system; if the low-voltage battery is not de-energized, maintaining the low-voltage battery to supply power to the battery management module to acquire data generated by the battery management system under low-voltage power supply; if the low-voltage battery is de-energized, switching the power battery in the vehicle to supply power to the battery management system to acquire data generated by the battery management system under high-voltage power supply.

[0017] In a third aspect, the present invention also provides a vehicle device, including a vehicle battery management system as described in the above embodiments, or employing a data acquisition method for a vehicle battery management system as described in the above embodiments.

[0018] In a fourth aspect, the present invention also provides an electronic device, comprising: one or more processors; and a storage device for storing one or more programs, which, when executed by the one or more processors, cause the one or more processors to implement the data acquisition method of the vehicle battery management system as described in the above embodiments.

[0019] The beneficial effects of this invention are as follows: This invention proposes a vehicle battery management system, a data acquisition method, an equipment, and a vehicle. First, the vehicle battery management system switches its power supply to the power battery pack when the low-voltage battery fails. This allows the battery management system to continue operating normally after the low-voltage battery fails, enabling it to monitor the power battery pack without excessive damage to the power battery, thus greatly improving the reliability of the battery management system. Second, the vehicle battery management system stores not only the initial battery data when the low-voltage battery is supplying power at low voltage, but also the initial battery data when the power battery pack is supplying power at high voltage, preventing data loss due to power failure and ensuring the integrity of the battery data. Third, the vehicle battery management system separates high-voltage and low-voltage power supply units, isolating them to avoid safety hazards caused by mixing high and low voltage power supplies, thereby improving safety.

[0020] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit the invention. Attached Figure Description

[0021] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention. It is obvious that the drawings described below are merely some embodiments of the invention, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. In the drawings:

[0022] Figure 1 This is a schematic diagram illustrating an implementation environment of a vehicle battery management system, as shown in an exemplary embodiment of the present invention.

[0023] Figure 2 This is a schematic diagram illustrating the principle of a vehicle battery management system according to an exemplary embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram illustrating a low-voltage power supply in an exemplary embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram illustrating high-voltage power supply in an exemplary embodiment of the present invention;

[0026] Figure 5 This is a flowchart illustrating a first switching process performed by a battery management system, as shown in an exemplary embodiment of the present invention.

[0027] Figure 6 This is a flowchart illustrating a second switching process performed by a battery management system, as shown in an exemplary embodiment of the present invention.

[0028] Figure 7 This is a flowchart illustrating a third switching process performed by a battery management system, as shown in an exemplary embodiment of the present invention.

[0029] Figure 8 This is a flowchart illustrating the initial power-on of the battery management system as shown in an exemplary embodiment of the present invention;

[0030] Figure 9 This is a flowchart illustrating a data acquisition method for a vehicle battery management system, as shown in an exemplary embodiment of the present invention.

[0031] Figure 10 This is a schematic diagram illustrating the structure of a computer system suitable for implementing the electronic device of the present invention, as shown in an exemplary embodiment of the present invention. Detailed Implementation

[0032] The embodiments of the present invention will be described below with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention and not for limiting the scope of protection of the present invention.

[0033] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0034] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the invention. However, it will be apparent to those skilled in the art that embodiments of the invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the invention.

[0035] It's important to understand that battery management systems (BMS) are typically integrated with the power battery pack. They are used to monitor the performance of individual battery cells, insulation, and total voltage, obtaining battery data to understand the battery's state. This data is crucial for managing the power battery pack and preventing malfunctions. In related technologies, the power supply for the BMS is usually a low-voltage battery. When the low-voltage battery loses power or the power battery pack is replaced, the BMS loses power, resulting in the loss of battery data acquired before the power outage. Furthermore, before power is restored, there is a management vacuum in the BMS, leading to low reliability.

[0036] Based on this, the present invention provides a technical solution for a vehicle battery management system. The system includes a power supply module comprising a low-voltage power supply unit and a high-voltage power supply unit, respectively used to supply power to the battery management system; a power management circuit for monitoring the power failure status of the low-voltage battery in the low-voltage power supply unit and determining whether to switch the power supply to the power management system based on the monitoring results; and a data processing module for detecting the power battery pack in the high-voltage power supply unit, obtaining and storing first battery data. Specifically, if the low-voltage battery is not de-energized, the low-voltage power supply unit remains the power supply to the battery management system, and the first battery data under low-voltage power supply is obtained. If the low-voltage battery is de-energized, the power supply to the battery management system is switched to the high-voltage power supply unit, and the first battery data under high-voltage power supply is obtained. This allows the battery management system to continue operating independently after the low-voltage battery is de-energized, thereby continuing to monitor the power battery pack and saving the detected first battery data for reporting after the low-voltage battery resumes power supply.

[0037] Please see Figure 1 This is a schematic diagram illustrating the implementation environment of a vehicle battery management system, as shown in an exemplary embodiment of the present invention.

[0038] Reference Figure 1 As shown, the implementation environment includes a vehicle 101 and a battery management system 102. The battery management system 102 is embedded within the vehicle 101, which is an electric vehicle powered by a power battery. The battery management system 101 typically uses the low-voltage battery within the vehicle 101 as its power source to manage the battery, i.e., monitor the power battery pack within the vehicle 101 to obtain battery data, analyze whether there are any abnormal data, store the data, and send it to the vehicle's infotainment system, allowing the user to intuitively understand the battery status of the power battery pack through the infotainment system. Therefore, to ensure that the battery management system 102 can operate normally after the low-voltage battery is de-energized, the power battery pack supplies power to the battery management system 102 after the low-voltage battery is de-energized. This allows the battery management system to maintain monitoring of the power battery pack, preventing the loss of battery data due to power failure and improving the stability of the battery management system's operation.

[0039] Please see Figure 2 This is a schematic diagram illustrating the principle of a vehicle battery management system, as shown in an exemplary embodiment of the present invention. This system can be applied to... Figure 1 The implementation environment shown is specifically configured in vehicle 101. This system can also be applied to other exemplary implementation environments and specifically configured in other devices; this embodiment does not limit the implementation environment to which the system is applicable.

[0040] like Figure 2As shown, this exemplary vehicle battery management system includes: a power supply module, a power management circuit, a data processing module, a secondary power supply circuit, a collision detection circuit, an RTC circuit (i.e., a clock circuit), a communication circuit, and a peripheral control circuit, detailed below:

[0041] The power supply module is used to supply power to the battery management system, including a low-voltage power supply unit and a high-voltage power supply unit, with high and low voltage isolation provided between the low-voltage power supply unit and the high-voltage power supply unit;

[0042] Specifically, such as Figure 2 As shown, the high-voltage power supply unit includes a power battery pack, a transformer drive circuit, a transformer, and a first switch, wherein:

[0043] The first switch is used to connect the power battery pack to the transformer drive circuit and the power management circuit respectively.

[0044] like Figure 2 As shown, the first switch is Figure 2 If the first switch K1 is closed, it indicates that the current power supply for the battery management system is the power battery pack.

[0045] The power battery pack, connected to the first switch, is used to supply power to the transformer drive circuit.

[0046] Specifically, the power battery pack is the power battery inside the vehicle, serving as the vehicle's power source and meeting the vehicle's driving range requirements. The power supply voltage of the power battery pack is typically 47V to 800V, and the power battery pack is usually composed of several battery cells arranged in a row. These cells can be lead-acid batteries, lithium iron phosphate batteries, hydrogen fuel cells, and ternary lithium batteries, etc. This embodiment does not impose any limitations on this.

[0047] The transformer drive circuit is connected to the power battery pack at one end and to the transformer at the other end. It is used to generate drive signals to control the operation of the transformer.

[0048] In detail, the transformer drive circuit generates a drive signal based on the transformer output to enable the transformer to operate stably and output a stable voltage and a first high-voltage current.

[0049] The transformer is used to step down the current output from the power battery pack according to the drive signal to obtain a first high-voltage current, and to supply power to the power management circuit and the secondary power supply circuit through the first high-voltage current.

[0050] In detail, a transformer is an electrical device consisting of two or more coils that transmit electrical energy through a changing magnetic field, i.e., it can reduce or increase voltage and current. Therefore, a transformer can reduce the voltage of the output current from a power battery pack to obtain a first high-voltage current; the voltage at which the first high current is supplied is the low voltage.

[0051] like Figure 2 As shown, in one embodiment of the invention, the transformer is L1, which is an isolation transformer. When the first switch K1 is closed, the power battery pack will activate the transformer drive circuit and transformer L1 through the first switch K1 to convert the output voltage of the power battery pack to 5V, that is, the voltage of the first high voltage current is 5V.

[0052] By utilizing the transformer drive current and the transformer to stably convert high voltage to low voltage, high and low voltage isolation is achieved, avoiding safety hazards caused by the mixing of high and low voltage and improving electrical safety.

[0053] like Figure 2 As shown, the low-voltage power supply unit includes a low-voltage battery, a primary power supply circuit, and a second switch, wherein:

[0054] Low-voltage batteries are used to supply power to the primary power supply circuit.

[0055] Specifically, a low-voltage battery is a low-voltage battery inside a vehicle, and its supply voltage typically ranges from 6V to 24V.

[0056] The primary power supply circuit is connected to the low-voltage battery and is used to step down the current output by the low-voltage battery to obtain a first high-voltage current, which then powers the power management circuit.

[0057] like Figure 2 As shown, the primary power supply current is directly powered by the low-voltage battery, converting the output current of the low-voltage battery into a first low-voltage current. This first low-voltage current simultaneously powers the secondary power supply circuit, peripheral control circuit, communication circuit, and power management circuit. The peripheral control circuit, connected to the primary power supply circuit, drives the external devices required by the battery management system. The communication circuit, connected to both the primary power supply circuit and the control circuit (MCU circuit), transmits the second battery information and switching time stored in the storage circuit to the vehicle's infotainment system via the control circuit. The communication circuit is powered by the primary power supply circuit.

[0058] The second switch is connected to the low-voltage battery at one end and to the current management circuit at the other end. It is used to connect the low-voltage battery to the power management circuit, so that the power management circuit can obtain the second battery data of the low-voltage battery and determine the power failure status of the low-voltage battery based on the second battery data.

[0059] The second switch is used to control the power supply of the low-voltage battery. When the second switch changes from the closed state to the open state, the low-voltage battery stops supplying power to the battery management system. The first switch needs to be closed immediately so that the power battery pack can supply power to the battery management system in time, preventing the battery management system from losing power and causing the first battery data to be lost.

[0060] In one embodiment of the present invention, the second switch is Figure 2 As shown in K1, if the second switch K2 is closed, it indicates that the current power supply for the battery management system is a low-voltage battery. The second switch K2 connects the low-voltage battery and the power management circuit, enabling the power management circuit to monitor the low-voltage battery.

[0061] The above method isolates the high-voltage power supply from the low-voltage power supply. When the high-voltage power supply is used, the first high-voltage current is used to supply the secondary power supply current, and when the low-voltage power supply is used, the first low-voltage current is used to supply the secondary power supply circuit, thereby improving the safety of high-voltage power use.

[0062] The secondary power supply circuit, connected to the power supply module, is used to convert the current output by the power supply module to power the data processing module. Specifically, if the secondary power supply module is powered by the low-voltage power supply unit, the first low-voltage current output by the low-voltage power supply unit is regulated, filtered, and rectified to obtain the second low-voltage current. If the secondary power supply module is powered by the high-voltage power supply unit, the first high-voltage current output by the high-voltage power supply unit is regulated, filtered, and rectified to obtain the second high-voltage current.

[0063] like Figure 2 As shown, in one embodiment of the present invention, the secondary power supply circuit supplies power to the MCU circuit, collision detection circuit, storage circuit, and RTC circuit at its downstream end, respectively. If a low-voltage battery supplies power to the battery management system, the MCU circuit, collision detection circuit, storage circuit, and RTC circuit are powered by a second low-voltage current; if a power battery pack supplies power to the battery management system, the MCU circuit, collision detection circuit, storage circuit, and RTC circuit are powered by a second high-voltage current. The RTC circuit, connected to the MCU circuit, is used to record the switching time between the low-voltage power supply unit and the second power supply unit, and stores the switching time in the storage circuit via a control circuit. The clock circuit is powered by the secondary power supply circuit.

[0064] The power management circuit, connected to the power supply module, is used to monitor the power failure status of the low-voltage battery in the low-voltage power supply unit and determine whether to switch the power supply of the power management system based on the monitoring results.

[0065] The power management circuit monitors the power supply of the battery management system and switches between high-voltage and low-voltage power to ensure the battery management system operates normally. The power management system monitors the low-voltage battery's power supply status in real time. If the low-voltage battery loses power, it determines whether the power loss is due to normal disconnection (e.g., disconnection of the second switch due to battery pack replacement) or other abnormalities (e.g., overvoltage, undervoltage, or abnormal collision signals).

[0066] The collision detection circuit, connected to the controlled circuit, is used to detect collision signals from the vehicle. The collision signals are then sent to the power management circuit via the control circuit.

[0067] Specifically, to prevent high-voltage leakage from harming people after a collision, it's necessary to disconnect the power supply from the battery pack. Since the battery management system and battery pack are typically integrated within the battery pack, there is no high-voltage electricity outside the battery pack. Therefore, if the collision detection circuit detects an abnormal collision signal, a second switch needs to be disconnected to stop the low-voltage battery from supplying power. This collision detection method prevents high-voltage leakage from causing damage to other vehicle components and endangering lives during traffic accidents, thus improving the safety of high-voltage electrical use.

[0068] In one embodiment of the present invention, Figure 2 After detecting an abnormal collision signal, the collision detection circuit in the system will notify the power management circuit through the MCU circuit, so that the power management circuit can disconnect the second switch and complete the switching from low voltage power supply to high voltage power supply.

[0069] The data processing module, connected to the power management circuit, is used to detect the power battery pack in the high-voltage power supply unit, obtain and store the first battery data. Specifically, if the low-voltage battery does not lose power, the low-voltage power supply unit remains the power source for the battery management system, and the first battery data under low-voltage power supply is obtained. If the low-voltage battery loses power, the power supply for the battery management system is switched to the high-voltage power supply unit, and the first battery data under high-voltage power supply is obtained. If the battery management system is powered by the high-voltage power supply unit and the low-voltage battery resumes power supply, the power supply for the battery management system is switched from the high-voltage power supply to the low-voltage power supply voltage.

[0070] Specifically, the data processing module includes: a battery detection circuit, connected to the power battery pack, used to detect the physical parameters of each battery cell in the power battery pack, including the voltage, current, and temperature of the battery cell; the battery detection circuit is powered by the power battery pack; a control circuit, connected to the battery detection circuit, used to detect the power battery based on the physical parameters of all battery cells in the power battery pack, obtain the first battery data of the power battery pack, and determine whether the first battery data is abnormal. The detection of the power battery includes insulation detection, equalization detection, and total voltage detection. The control circuit is powered by a secondary power supply circuit; and a storage circuit, connected to the control circuit, used to store the battery information of the power battery pack obtained by the detection unit. The storage circuit is powered by a secondary power supply circuit.

[0071] In one embodiment of the present invention, the battery management system can detect the power battery pack through a battery detection circuit and a control circuit to obtain first battery data. The battery detection circuit periodically or in real-time monitors the physical parameters of each battery cell in the power battery pack, such as voltage, input current, output current, temperature, and state of charge, and sends these physical parameters to the MCU circuit. The MCU circuit detects and calculates these parameters to obtain the first battery data, which includes at least the total voltage of the power battery pack, the balance state of individual cells, and the insulation performance of the power battery. This allows the system to determine whether the first battery data is abnormal, i.e., whether the second battery data contains abnormal data, and stores this data through a storage circuit. It should be understood that in actual operation, the second battery data can be filtered according to actual needs, storing only the filtered data, for example, only the abnormal data. If the first battery data is abnormal, the system can promptly resolve any abnormalities in the power battery, ensuring normal operation and improving the reliability and safety of the power battery.

[0072] In one embodiment of the present invention, if the data of the second battery is abnormal, the MCU circuit can realize functions such as voltage protection, temperature protection, short circuit protection, overcurrent protection, and insulation protection of the power battery pack, and realize voltage balance management between individual batteries.

[0073] Please see Figure 3 This is a schematic diagram illustrating a low-voltage power supply as an exemplary embodiment of the present invention. Figure 3 As shown, when the low-voltage battery does not lose power and maintains low-voltage power supply, the second switch K2 is closed. The primary power supply circuit is powered by the low-voltage battery, the secondary power supply circuit, peripheral control circuit, power management circuit and communication circuit are powered by the primary power supply circuit, and the MCU circuit, storage circuit, RTC circuit and collision detection circuit are powered by the secondary power supply circuit. At this time, the first battery data stored in the storage circuit is obtained when the low-voltage power supply is used.

[0074] Please see Figure 4 This is a schematic diagram illustrating a high-voltage power supply as an exemplary embodiment of the present invention. Figure 4 As shown, when the low-voltage battery loses power and switches from low-voltage to high-voltage power supply, the first switch K1 is closed. The transformer drive circuit and the transformer form a high-voltage circuit, which is powered by the power battery pack. The secondary power supply circuit and the power management circuit are powered by the high-voltage circuit. The MCU circuit, storage circuit, RTC circuit and collision detection circuit are powered by the secondary power supply circuit. At this time, the first battery data stored in the storage circuit is the data obtained when the high-voltage power supply is applied.

[0075] In this way, even if the low-voltage battery loses power, the initial battery data obtained during low-voltage power supply is stored in the storage circuit. Once the low-voltage battery resumes power supply, it is then sent to the vehicle's infotainment system via the communication circuit. This avoids battery data loss while simultaneously switching the power battery pack to supply power to the battery management system, ensuring the battery management system can function normally and obtain battery data during high-voltage power supply. This not only improves the reliability of the battery management system but also guarantees the integrity of the battery data.

[0076] In one embodiment of the present invention, the data processing module further includes: a first switching unit, configured to switch the secondary power supply circuit from a first low-voltage current supply to a first high-voltage current supply if the second switch is in an open state; wherein, if the second switch is in an open state, a first switching command is generated and sent to the control circuit; if a first feedback signal carrying normal first battery data is received from the control circuit, the secondary power supply circuit is switched from a first low-voltage current supply to a first high-voltage current supply, so that the output of the secondary power supply circuit from a second low-voltage current is converted to a second high-voltage current; if a first feedback signal carrying abnormal first battery data is received from the control circuit, power supply to the battery management system is stopped.

[0077] Specifically, please refer to Figure 5 This is a flowchart illustrating a battery management system performing a first switch, as shown in an exemplary embodiment of the present invention. Figure 5 As shown, when performing operations such as maintenance or battery swapping of the power battery pack that require the power battery to be directly disconnected from the vehicle, the second switch is first disconnected. Upon detecting the second switch being disconnected, the power management circuit controls the first switch to close and generates a first switching command, which is sent to the MCU circuit. After the first switch closes, the transformer drive circuit controls the transformer to stably output a first high-voltage current. At this time, if the first battery data retrieved by the MCU circuit is normal, the power supply to the battery management system is switched from the low-voltage battery to the high-voltage battery, causing the secondary power supply circuit to output a second high-voltage current, completing the first switch and notifying the vehicle's infotainment system. If the first battery data retrieved by the MCU circuit is abnormal, such as insulation problems, overvoltage, or undervoltage issues in the power battery pack, power supply to the battery management system is stopped, and the abnormal data is sent to the vehicle's infotainment system.

[0078] In one embodiment of the present invention, the data processing module further includes: a second switching unit, configured to switch the secondary power supply circuit from a first low-voltage current supply to a first high-voltage current supply if the collision signal is abnormal or the low-voltage battery power failure is abnormal; wherein, if there is no abnormal data in the first battery data, a second switching command is generated and sent to the control circuit; if a second feedback information carrying a collision signal or the second battery data is still abnormal is received from the control circuit within a preset time, the secondary power supply circuit is switched from the first low-voltage current supply to the first high-voltage current supply, so that the output of the secondary power supply circuit is converted from the second low-voltage current to the second high-voltage current; if no second feedback information carrying a collision signal or the second battery data is still abnormal is received from the control circuit within a preset time, the secondary power supply circuit is kept powered by the first low-voltage current.

[0079] Specifically, please refer to Figure 6 This is a flowchart illustrating the second switching process of a battery management system, as shown in an exemplary embodiment of the present invention. During the battery management system's use of a low-voltage battery for power, if an abnormal collision signal or low-voltage battery power failure is detected (i.e., an abnormal signal such as collision, low-voltage battery overvoltage, or undervoltage is detected), and the first battery data is normal, the MCU will send the abnormal signal to the power management circuit to control the first switch to close. The transformer drive circuit will control the transformer to stably output the first high-voltage current. The power management circuit will generate and send a second switching command to the MCU circuit. At this time, the MCU circuit will determine within a preset time whether the abnormal signal still exists. If it does not exist, the power supply will not be switched, and the secondary power supply circuit will remain powered by the first low-voltage current; if it exists, the power supply will be switched.

[0080] In one embodiment of the present invention, the data processing module further includes: a third switching unit, used to switch the secondary power supply circuit from being powered by a first high-voltage current to being powered by a first low-voltage current; wherein, a third switching instruction is generated and sent to the control circuit; if a third feedback information carrying that the low-voltage battery is not losing power is received from the control circuit, then the low-voltage battery power supply is normal, and the secondary power supply circuit is switched from being powered by the first high-voltage current to being powered by the first low-voltage current, so that the output of the secondary power supply circuit is converted from the second high-voltage current to the second low-voltage current; if a third feedback information carrying that the low-voltage battery is losing power is received from the control circuit, then the low-voltage battery power supply is abnormal, and the secondary power supply circuit is kept powered by the first high-voltage circuit.

[0081] Specifically, please refer to Figure 7 This is a flowchart illustrating a third switching process performed by a battery management system, as shown in an exemplary embodiment of the present invention. Figure 7As shown, after performing operations such as maintenance or battery swapping that require the power battery to be directly disconnected from the vehicle, the power battery pack will be reinstalled in the vehicle. At this time, the low-voltage battery will be reconnected to the primary power supply circuit, and the second switch will be closed. After detecting that the second switch is closed, the power management circuit will generate and send a third switching command to the MCU circuit. At this time, the MCU circuit will check whether the low-voltage battery power supply is normal. If it is normal and the primary power supply circuit stably outputs the first low-voltage current, the power supply of the battery management system will be switched to the low-voltage battery, causing the secondary power supply circuit to output the second low-voltage current, completing the third switching, and notifying the vehicle's infotainment system. If it is not normal, or the first low-voltage current output is abnormal, the MCU circuit will send the reason for the switching failure to the vehicle's infotainment system.

[0082] Specifically, please refer to Figure 8 This is a flowchart illustrating the initial power-on process of a battery management system according to an exemplary embodiment of the present invention. During the initial power-on, the low-voltage battery of the vehicle battery management system of the present invention supplies power to the primary power supply circuit and simultaneously closes the second switch. The primary power supply circuit then outputs a first low-voltage current to power the power management circuit, the secondary power supply circuit, the communication circuit, and the peripheral control circuit. This causes the secondary power supply circuit to output a second low-voltage current to power its downstream MCU circuit, collision detection circuit, storage circuit, and RTC circuit. At this time, the MCU circuit uses the battery detection circuit to determine whether the power battery pack is connected. If not connected, the RTC circuit records the disconnection time t1 and stores it in the storage circuit. After the power battery is successfully connected, the connection time t2 is recorded, and t1 and t2 are sent to the vehicle's infotainment system via the communication circuit through the MCU circuit, thus completing the initial power-on.

[0083] In this way, when the low-voltage battery fails, the vehicle's battery management system switches its power supply to the power battery pack. This allows the battery management system to continue operating normally after the low-voltage battery fails, without excessively damaging the power battery, significantly improving the stability of the battery management system. Furthermore, the system stores the battery data under both low-voltage and high-voltage power supply conditions, preventing data loss due to power failure and ensuring the integrity of the battery data.

[0084] Please see Figure 9 This is a flowchart illustrating a data acquisition method for a vehicle battery management system, as shown in an exemplary embodiment of the present invention. This method can be applied to... Figure 1 The implementation environment shown is specifically executed by the battery management system 102 within that implementation environment. It should be understood that this method can also be applied to other exemplary implementation environments, and this embodiment does not limit the implementation environment to which the method is applicable.

[0085] like Figure 9 As shown, in an exemplary embodiment, the data acquisition method of the vehicle battery management system includes at least steps S910 to S940, which are detailed below:

[0086] Step S910: Obtain control instructions for the controlled object generated by the vehicle controller on the vehicle;

[0087] Step S920: Divide the input voltage provided by the high-voltage battery module on the vehicle to output the first voltage;

[0088] Step S930: Control the switching state of each controlled object according to the control command to form three different sampling paths to detect the first voltage respectively, so as to obtain the main positive voltage, the main negative voltage and the total voltage. The controlled objects include the first switch, the second switch and the third switch.

[0089] Step S940: Based on the detected main positive voltage, main negative voltage and total voltage, determine the closing state of each switch to complete the high voltage power-on detection.

[0090] It should be noted that the data acquisition method of the vehicle battery management system provided in the above embodiments is based on the same concept as the vehicle battery management system provided in the above embodiments. The specific way of performing each step has been described in detail in the circuit embodiments, and will not be repeated here.

[0091] Embodiments of the present invention also provide a vehicle device, the vehicle including the vehicle battery management system provided in the above embodiments, or using the data acquisition method of the vehicle battery management system provided in the above embodiments.

[0092] Embodiments of the present invention also provide an electronic device, including: one or more processors; and a storage device for storing one or more programs, wherein when the one or more programs are executed by the one or more processors, the electronic device enables the data acquisition method of the vehicle battery management system provided in the above embodiments.

[0093] Please see Figure 10 A schematic diagram of a computer system suitable for implementing embodiments of the present invention is shown. It should be noted that... Figure 10 The computer system 1000 of the electronic device shown is merely an example and should not impose any limitation on the functionality and scope of use of the embodiments of the present invention.

[0094] like Figure 10As shown, the computer system 1000 includes a Central Processing Unit (CPU) 1001, which can perform various appropriate actions and processes, such as executing the methods described in the above embodiments, based on programs stored in Read-Only Memory (ROM) 1002 or programs loaded from storage portion 1008 into Random Access Memory (RAM) 1003. The RAM 1003 also stores various programs and data required for system operation. The CPU 1001, ROM 1002, and RAM 1003 are interconnected via a bus 1004. An Input / Output (I / O) interface 1005 is also connected to the bus 1004.

[0095] The following components are connected to I / O interface 1005: an input section 1006 including a keyboard, mouse, etc.; an output section 1007 including a cathode ray tube (CRT), liquid crystal display (LCD), etc., and speakers, etc.; a storage section 1008 including a hard disk, etc.; and a communication section 1009 including a network interface card such as a LAN (Local Area Network) card, modem, etc. Communication section 1009 performs communication processing via a network such as the Internet. Drive 1010 is also connected to I / O interface 1005 as needed. Removable media 1011, such as a disk, optical disk, magneto-optical disk, semiconductor memory, etc., are installed on drive 1010 as needed so that computer programs read from them can be installed into storage section 1008 as needed.

[0096] In particular, according to embodiments of the present invention, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments of the present invention include a computer program product comprising a computer program carried on a computer-readable medium, the computer program containing computer programs for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via communication section 1009, and / or installed from removable medium 1011. When the computer program is executed by central processing unit (CPU) 1001, it performs various functions defined in the system of the present invention.

[0097] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of the present invention. Each block in a flowchart or block diagram may represent a module, segment, or portion of code, which contains one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in a block diagram or flowchart, and combinations of blocks in a block diagram or flowchart, may be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0098] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A vehicle battery management system, characterized by, The system comprises a power supply module, a power management circuit, a data processing module and a secondary power supply circuit; The power supply module comprises a low-voltage power supply unit and a high-voltage power supply unit, which are respectively used for supplying power to the battery management system; The power management circuit is connected with the power supply module, and is used for monitoring the power-off state of the low-voltage storage battery in the low-voltage power supply unit, and determining whether to switch the power supply of the battery management system based on the monitoring result; The data processing module is connected with the power management circuit, and is used for detecting the power battery pack in the high-voltage power supply unit, obtaining and storing first battery data, wherein if the low-voltage storage battery does not power off, the low-voltage power supply unit is maintained as the power supply of the battery management system, and the first battery data during the low-voltage power supply is obtained, and if the low-voltage storage battery powers off, the power supply of the battery management system is switched to the high-voltage power supply unit, and the first battery data during the high-voltage power supply is obtained; The secondary power supply circuit is connected with the power supply module, and is used for converting the current output by the power supply module to supply power to the data processing module according to the converted current; The low-voltage power supply unit comprises a second switch connected with the power management circuit; The power management circuit comprises: A first switching unit is used for switching the secondary power supply circuit from being supplied by the low-voltage power supply unit to being supplied by the high-voltage power supply unit if the second switch is in an off state; If the second switch is in an off state, a first switching instruction is generated and sent to the data processing module; If a first feedback signal carrying the first battery data exception is received from the data processing module, the power supply to the battery management system is stopped.

2. The vehicle battery management system of claim 1, wherein, If the secondary power supply circuit is supplied by the low-voltage power supply unit, a second low-voltage current is obtained by stabilizing, filtering and rectifying a first low-voltage current output by the low-voltage power supply unit; If the secondary power supply circuit is supplied by the high-voltage power supply unit, a second high-voltage current is obtained by stabilizing, filtering and rectifying a first high-voltage current output by the high-voltage power supply unit, and a high-low voltage isolation is provided between the low-voltage power supply unit and the high-voltage power supply unit.

3. The vehicle battery management system of claim 2, wherein, The high-voltage power supply unit comprises the power battery pack, a transformer driving circuit, a transformer and a first switch; The first switch is used for connecting the power battery pack with the transformer driving circuit and the power management circuit respectively; The power battery pack is connected with the first switch, and is used for supplying power to the transformer driving circuit; The transformer driving circuit is connected with the power battery pack, and is used for generating a driving signal to control the transformer to work; The transformer is used for stepping down the current output by the power battery pack according to the driving signal to obtain a first high-voltage current, and supplying power to the power management circuit and the secondary power supply circuit through the first high-voltage current.

4. The vehicle battery management system of claim 2, wherein, The low-voltage power supply unit further comprises the low-voltage storage battery and a primary power supply circuit; The low-voltage storage battery is used for supplying power to the primary power supply circuit; The primary power supply circuit is connected with the low-voltage storage battery and is used for reducing the current output by the low-voltage storage battery to obtain a first low-voltage current and supplying power to the power management circuit through the first low-voltage current; The second switch has one end connected with the low-voltage storage battery and the other end connected with the power management circuit, and is used for connecting the low-voltage storage battery with the power management circuit, enabling the power management circuit to obtain second battery data of the low-voltage storage battery and determining the power-off condition of the low-voltage storage battery based on the second battery data.

5. The vehicle battery management system of claim 4, wherein, The data processing module comprises: The battery detection circuit is connected with the power battery pack and is used for detecting physical parameters of each battery monomer in the power battery pack, wherein the physical parameters include voltage, current and temperature of the battery monomer, and the battery detection circuit is powered by the power battery pack; The control circuit is connected with the battery detection circuit and is used for detecting the power battery according to the physical parameters of all the battery monomers in the power battery to obtain first battery data of the power battery pack and judging whether the first battery data is abnormal, wherein the detection of the power battery includes insulation detection, balance detection and total voltage detection, and the control circuit is powered by the secondary power supply circuit; The storage circuit is connected with the control circuit and is used for storing battery information of the power battery pack obtained by the battery detection circuit, and the storage circuit is powered by the secondary power supply circuit.

6. The vehicle battery management system of claim 5, wherein, The system further comprises: The collision detection circuit is connected with the control circuit and is used for detecting a collision signal of the vehicle, and the collision signal is sent to the power management circuit through the control circuit.

7. The vehicle battery management system of claim 5, wherein, The first switching unit is used for switching the secondary power supply circuit from being powered by the first low-voltage current to being powered by the first high-voltage current if the second switch is in an open state; If the second switch is in an open state, the first switching instruction is generated and sent to the control circuit; If the first feedback signal carrying the normal first battery data is received from the control circuit, the secondary power supply circuit is switched from being powered by the first low-voltage current to being powered by the first high-voltage current, and the second low-voltage current output by the secondary power supply circuit is converted into the second high-voltage current; If the first feedback signal carrying the abnormal first battery data is received from the control circuit, the power supply to the battery management system is stopped.

8. The vehicle battery management system of claim 6, wherein, The power management circuit further comprises: The second switching unit is used for switching the secondary power supply circuit from being powered by the first low-voltage current to being powered by the first high-voltage current if the collision signal is abnormal or the low-voltage storage battery is in an abnormal power-off condition; If the first battery data is normal, the second switching instruction is generated and sent to the control circuit. if the second feedback information carrying the collision signal or the second battery data still abnormal is received from the control circuit within a preset time, the second power supply circuit is switched from the first low-voltage current supply to the first high-voltage current supply, so that the second low-voltage current output by the second power supply circuit is converted into the second high-voltage current; if the second feedback information carrying the collision signal or the second battery data still abnormal is not received from the control circuit within a preset time, the second power supply circuit is kept powered by the first low-voltage current.

9. The vehicle battery management system of claim 5, wherein, The power management circuit further comprises: a third switching unit configured to switch the second power supply circuit from the first high-voltage current supply to the first low-voltage current supply; wherein a third switching instruction is generated and sent to the control circuit; if the third feedback information carrying that the low-voltage battery does not lose power is received from the control circuit, the low-voltage battery supply is normal, the second power supply circuit is switched from the first high-voltage current supply to the first low-voltage current supply, so that the second high-voltage current output by the second power supply circuit is converted into the second low-voltage current; if the third feedback information carrying that the low-voltage battery loses power is received from the control circuit, the low-voltage battery supply is abnormal, and the second power supply circuit is kept powered by the first high-voltage current.

10. The vehicle battery management system of claim 5, wherein, The system further comprises: a clock circuit connected to the control circuit, configured to record the switching time of power supply between the low-voltage power supply unit and the high-voltage power supply unit, and store the switching time in the storage circuit through the control circuit, the clock circuit being powered by the second power supply circuit; a communication circuit connected to the first power supply circuit and the control circuit respectively, configured to send the battery information and the switching time stored in the storage circuit to the vehicle machine in the vehicle through the control circuit, the communication circuit being powered by the first power supply circuit; an external device control circuit connected to the first power supply circuit, configured to control the external devices of the battery management system, the external device control circuit being powered by the first power supply circuit.

11. A data acquisition method for a vehicle battery management system, characterized by, The method applied to the vehicle battery management system of any one of claims 1 to 10, the method comprising: detecting the power supply condition of the low-voltage battery in the vehicle to determine whether the low-voltage battery loses power, the low-voltage battery being configured to supply power to the battery management system in the vehicle; if the low-voltage battery does not lose power, keeping the low-voltage battery to supply power to the battery management system to collect the data generated by the battery management system under low-voltage power supply; if the low-voltage battery loses power, switching the power battery in the vehicle to supply power to the battery management system to collect the data generated by the battery management system under high-voltage power supply.

12. A vehicle apparatus characterized by comprising: The vehicle comprises the vehicle battery management system of any one of claims 1 to 10, or adopts the data collection method of the vehicle battery management system of claim 11.

13. An electronic device, comprising: comprise: one or more processors; a memory storage storing one or more programs that, when executed by the one or more processors, cause the electronic device to implement the data collection method of the vehicle battery management system as claimed in claim 11.

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