Vehicle-mounted power supply system and control method

Abstract

The application provides a vehicle-mounted power supply system and a control method. The system comprises a battery management controller, a battery collection box, a vehicle-mounted charger, a direct current converter and a power distribution unit integrated in a high-voltage power supply box. The battery management controller, the vehicle-mounted charger and the direct current converter share a control module, and the vehicle-mounted charger and the direct current converter share a main circuit. If the control module receives a charging request, a first loop connecting the power battery and the vehicle-mounted charger is formed through the main circuit to charge the power battery. If a voltage conversion request is received, a second loop connecting the power battery and the direct current converter is formed through the main circuit to convert the input or output voltage. The control module monitors the state data of the power battery in real time, manages the power battery according to the state data, and the power distribution unit is used for power distribution of multiple high-voltage electrical appliances. The application not only reduces the cost, size and volume of the vehicle-mounted power supply system, but also reduces the weight.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of vehicle electric control, and particularly relates to a vehicle-mounted power supply system and a control method. BACKGROUND

[0002] In an electric vehicle, a vehicle-mounted power supply network is a key system of the vehicle, and is used for realizing conversion, transmission and distribution of high-voltage power. At present, low cost and miniaturization are the development trends of the power supply technology of the electric vehicle.

[0003] However, in the related art, as core components in the vehicle-mounted power supply, a BMC (battery management controller) and a BJB (battery junction box) are mechanically integrated in a battery, and an OBC (on-board charger), a DC / DC (direct current converter) and a PDU (power distribution unit) exist as separate components or are integrated in one piece in pairs. Due to the low integration degree of the vehicle-mounted power supply, the electric control is not only large in size but also overweight (heavy in weight), and cannot be miniaturized. In this way, the manufacturing cost of the vehicle is increased due to repeated use of the same electronic devices. SUMMARY

[0004] In view of the above-mentioned defects of the prior art, the purpose of the present application is to provide a vehicle-mounted power supply system and a control method, which are used for solving the problems of high cost and large size of the vehicle-mounted power supply system in the prior art.

[0005] To achieve the above-mentioned purpose and other related purposes, a first aspect of the present application provides a vehicle-mounted power supply system, which comprises a power battery, a high-voltage power box electrically connected with the power battery, and a battery management controller, a battery junction box, an on-board charger, a direct current converter and a power distribution unit integrated in the high-voltage power box; the battery management controller, the on-board charger and the direct current converter share a control module, and the on-board charger and the direct current converter share a main circuit; the control module forms a first loop connecting the power battery and the on-board charger through the main circuit to charge the power battery if a charging request is received, and forms a second loop connecting the power battery and the direct current converter through the main circuit to convert the input or output direct current voltage if a voltage conversion request is received; the control module monitors state data of the power battery in real time, manages the power battery according to the state data, and enables the power distribution unit to complete the power distribution function.

[0006] In some embodiments of the first aspect of the application, the control module comprises a multi-core microcontroller having a plurality of processing cores, the multi-core microcontroller is configured to, in response to a task request, invoke a processing core matching the type of the task request to respond, the battery management controller, the on-board charger and the DC converter each generate a task request of different type.

[0007] In some embodiments of the first aspect of the application, the multi-core microcontroller configures a priority level of each of the processing cores according to processing performance of the processing core, and responds according to the processing core matching the priority level according to the type of the task request received; wherein the priority level of the type of the task request corresponds to the priority level of the processing core one by one; if any of the task requests matches one of the processing cores, the processing core is invoked to respond; if any of the task requests matches a plurality of the processing cores, the processing core with the least number of queued task requests is selected to respond; if any of the task requests only matches one of the processing cores, and the number of queued task requests of the processing core currently mounted exceeds a preset threshold, the processing core with a higher priority level than the priority level corresponding to the current task request is selected to respond.

[0008] In some embodiments of the first aspect of the application, the DC converter comprises a bidirectional DCDC, and the battery collection box pre-charges or actively discharges the power battery through the bidirectional DCDC.

[0009] In some embodiments of the first aspect of the application, the DC converter further comprises a first switch, a second switch and a support capacitor, the positive electrode of the power battery is connected to a first end of the bidirectional DCDC through the first switch, the negative electrode of the power battery is connected to a second end of the bidirectional DCDC through the second switch, and the support capacitor is arranged outside the on-board power supply system and is connected in parallel between the first end and the second end.

[0010] In some embodiments of the first aspect of the application, the battery management controller, the battery collection box, the on-board charger, the DC converter and the power distribution unit share a cooling system, the cooling system comprises at least one of air cooling, water cooling, oil cooling, gas cooling and phase change cooling.

[0011] In some embodiments of the first aspect of the application, the high-voltage power supply box is integrated in a battery pack in which the power battery is located, or the high-voltage power supply box is covered above the battery pack through a mounting interface.

[0012] In some embodiments of the first aspect of the application, if the high-voltage power supply box is integrated in the battery pack in which the power battery is located, the power battery shares a cooling system with the battery management controller, the battery current collection box, the on-board charger, the DC converter, and the power distribution unit.

[0013] In some embodiments of the first aspect of the application, the battery management controller, the battery current collection box, the on-board charger, the DC converter, and the power distribution unit are integrated in the high-voltage power supply box through a signal plug-in row or a high-voltage busbar.

[0014] In some embodiments of the first aspect of the application, the main circuit is an integrated on-board charger, which includes multiplexing devices required for the operation of the DC converter, and the multiplexing devices include a high-voltage filter assembly, a transformer assembly, a power switch tube, a driving assembly, and a discharging assembly.

[0015] The second aspect of the application provides a control method of an on-board power supply system, which includes a power battery, a high-voltage power supply box electrically connected to the power battery, and a battery management controller, a battery current collection box, an on-board charger, a DC converter, and a power distribution unit integrated in the high-voltage power supply box; the battery management controller, the on-board charger, and the DC converter share a control module, and the on-board charger and the DC converter share a main circuit; wherein the control method includes: monitoring state data of the power battery in real time by using the control module, managing the power battery according to the state data, so that the power distribution unit completes power distribution of external high-voltage loads; if a charging request is received, a first loop connecting the power battery and the on-board charger is formed through the main circuit to charge the power battery; and if a voltage conversion request is received, a second loop connecting the power battery and the DC converter is formed through the main circuit to convert the input or output DC voltage.

[0016] As described above, one technical solution of the on-board power supply system and the control method according to the application has the following beneficial effects:

[0017] By integrating the battery management controller, the battery current collection box, the on-board charger, the DC converter, and the power distribution unit in the high-voltage power supply box, and by sharing the control module by the battery management controller, the on-board charger, and the DC converter and sharing the main circuit by the on-board charger and the DC converter, on one hand, the same components are multiplexed without affecting the original performance, which greatly reduces the number of the same components; on the other hand, by improving the integration of the on-board power supply system, not only the cost of the on-board power supply system is reduced, the size of the on-board power supply system is decreased, but also the weight of the on-board power supply system is reduced, and the working efficiency of the on-board power supply system is improved. Attached Figure Description

[0018] Figure 1 The diagram shows an implementation environment for an on-board power system provided in this application.

[0019] Figure 2 The diagram shown is a structural block diagram of an on-board power supply system provided in this application.

[0020] Figure 3 The diagram shown is a schematic diagram of the arrangement of a medium- and high-voltage power supply box for an electric vehicle provided in this application.

[0021] Figure 4 The image shown is a comparison of the old and new vehicle power systems provided in this application.

[0022] Figure 5 The diagram shows a comparison of a new and an old precharge and discharge circuit scheme provided in this application.

[0023] Figure 6 The diagram shown is a cooling schematic of an on-board power system provided in this application.

[0024] Figure 7 The diagram shown is a flowchart of a control method based on an on-board power system provided in this application. Detailed Implementation

[0025] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. This application 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 this application. It should be noted that, unless otherwise specified, the following embodiments and features in the embodiments can be combined with each other.

[0026] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. Therefore, the drawings only show the components related to this application 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.

[0027] As mentioned in the background section, the inventors have discovered that with the widespread application of electric vehicles, thanks to the cost reduction and structural miniaturization advantages brought by the deep integration of all-in-one products, the integration of vehicle power systems into all-in-one systems has gradually entered the market and has become a future technological trend.

[0028] However, the current vehicle power supply system multi-in-one product integration is mainly mechanical integration, only a few products have weak electric control integration, and almost no products involve deep power topology integration. The mechanical integration has almost reached the limit, and the weak electric control integration can only reduce the circuit board, which contributes little to cost reduction and efficiency improvement and structure miniaturization design. At the same time, the complex vehicle power supply system such as vehicle charger and battery management controller needs to use multiple large-size and large-volume power switches to form a bridge power loop, and the overall size of the corresponding vehicle power supply system is still large. This makes the integration of the multi-in-one vehicle power supply system unable to be further improved, which will limit the related applications.

[0029] Based on this, the present application provides a multi-in-one vehicle power supply system technical solution: please refer to Figure 1 Taking the vehicle power supply system executed by a target vehicle as an example, the target vehicle includes a power battery, a high-voltage power box electrically connected with the power battery, and a battery management controller, a battery collection box, a vehicle charger, a direct current converter and a power distribution unit integrated in the high-voltage power box; the battery management controller, the vehicle charger and the direct current converter share a control module, and the vehicle charger and the direct current converter share a main circuit; if the control module receives a charging request, a first loop connecting the power battery and the vehicle charger is formed through the main circuit to charge the power battery; if a voltage conversion request is received, a second loop connecting the power battery and the direct current converter is formed through the main circuit to convert the input or output direct current voltage; the control module monitors the state data of the power battery in real time, manages the power battery according to the state data, so that the power distribution unit completes the power distribution of external high-voltage loads.

[0030] In the above manner, the main circuit is reused as the vehicle charger and the direct current converter to simplify the primary circuit of the direct current conversion unit, reuse the high-voltage filter assembly, transformer assembly, power switch tube and drive, passive discharge assembly, etc., to simplify the power circuit topology structure of the multi-in-one electric drive power supply system, improve the integration of the multi-in-one vehicle power supply system, and improve the working efficiency of the vehicle charger module; the control circuit of the battery management controller, the control circuit of the vehicle charger and the control circuit of the direct current converter are integrated on one circuit board to reduce the number of required circuit boards.

[0031] The present application will be described in detail below through specific embodiments. Please refer to Figure 2 as shown, Figure 2 A vehicle power supply system structure block diagram is provided for this application, which is described in detail as follows:

[0032] The power battery, a high-voltage power box directly connected with the power battery through a high-voltage busbar, and a battery management controller 21, a vehicle-mounted charger 22, a direct-current converter 23 and a power distribution unit 24 integrated in the high-voltage power box 2;

[0033] The battery management controller 21, the vehicle-mounted charger 22 and the direct-current converter 23 share a control module 26 (i.e., one control module), and the vehicle-mounted charger 22 and the direct-current converter 23 share a main circuit 27 (i.e., one main circuit). If the control module 26 receives a charging request, the control module 26 forms a first loop connected with the power battery and the vehicle-mounted charger through the main circuit to charge the power battery. If the control module 26 receives a voltage conversion request, the control module 26 forms a second loop connected with the power battery and the direct-current converter through the main circuit to convert the input or output direct-current voltage.

[0034] The control module 26 monitors the state data of the power battery in real time and manages the power battery according to the state data. The power distribution unit adjusts the power distribution strategy based on the state data.

[0035] It should be understood that the battery management controller 21 is responsible for monitoring the state data of the power battery in real time, and the state data includes but is not limited to the voltage, current, temperature and SOC (state of charge) of the battery. The battery management controller is used to finely manage the power battery, so as to ensure that the battery operates in a safe and efficient state. In this embodiment, all functions of the original battery management controller are realized by sharing one control module.

[0036] The vehicle-mounted charger 22 is used to charge the power battery. When the control module 26 receives a charging request, the control module 26 turns on or off the main circuit 27 according to the charging request, for example, by forming a first loop connected with or disconnected with the power battery and the vehicle-mounted charger, so as to start or stop the operation of the vehicle-mounted charger. In this way, the power battery is charged according to the actual demand, so as to ensure that the battery is fully charged and not overcharged.

[0037] It should be understood that the vehicle-mounted charger 22 can also be designed as a "bidirectional" vehicle-mounted charger according to the actual demand of the user. For example, if the vehicle-mounted charger is "forward", the power battery is charged. If the vehicle-mounted charger is "reverse", the external load or the power grid is discharged. Details are not described herein.

[0038] The direct current converter 23 is used for converting the input or output direct current voltage, when the control module 26 receives a voltage conversion request, the main circuit 27 is turned on or off according to the voltage conversion request, for example, by connecting or disconnecting the power battery and the second loop of the direct current converter, so as to start or stop the work of the direct current converter, so as to flexibly adjust the conversion ratio and direction of the voltage, and meet the voltage demand of different devices and loads.

[0039] It should be noted that since the main circuit 27 is shared, it at least includes two control loops, one control loop (second loop) corresponds to the direct current converter 23, and the other control loop (first loop) corresponds to the vehicle-mounted charger 22, and the on-off of different control loops is controlled by generating different request controls, which can realize the functions of controlling whether the vehicle-mounted charger works and whether the direct current converter works.

[0040] It is worth noting that the battery management controller 21, the battery collection box 25, the vehicle-mounted charger 22 and the direct current converter 23 share one control module 26, which greatly simplifies the control structure of the vehicle-mounted power supply system and improves the reliability and response speed of the vehicle-mounted power supply system; at the same time, the vehicle-mounted charger 22 and the direct current converter 23 share one main circuit 27, which also reduces the complexity and cost of the vehicle-mounted power supply system.

[0041] The power distribution unit 24 realizes power distribution of multiple external high-voltage loads according to the load of the vehicle-mounted power supply system and the demand of the user and other factors, and ensures the efficient and stable operation of the vehicle-mounted power supply system.

[0042] In the embodiment, by integrating multiple key components and sharing the control module and the main circuit, efficient management and energy conversion of the power battery are realized; at the same time, by monitoring the state data of the power battery in real time and adjusting the power distribution strategy, the safe and stable operation of the system is ensured.

[0043] The direct current converter 23 includes a bidirectional DCDC, and the battery collection box pre-charges or actively discharges the power battery through the bidirectional DCDC.

[0044] The direct current converter further includes a first switch, a second switch and a support capacitor, the positive electrode of the power battery is connected to the first end of the bidirectional DCDC through the first switch, the negative electrode of the power battery is connected to the second end of the bidirectional DCDC through the second switch, and the support capacitor is arranged outside the vehicle-mounted power supply system and is connected in parallel between the first end and the second end. The switching state of the first switch and the second switch is adjusted based on the state data, so as to realize the functions of turning on and turning off the high voltage of the whole vehicle.

[0045] Optionally, the functions of the pre-charging circuit and the active discharging circuit are realized based on the bidirectional direct current converter, so as to reduce the cost.

[0046] It should be understood that the pre-charge function is to protect the high-voltage components from being subjected to a large current impact; when the power battery starts to be charged, the system is pre-charged by the bidirectional DC converter 23 with a small current, ensuring that each component gradually reaches the normal working voltage, thereby avoiding damage caused by a sudden large current impact.

[0047] In addition, the active discharge is to safely and quickly reduce the voltage of the power battery, for example, when the high-voltage power is normally lowered, repaired, replaced, or other system operations, the voltage of the power battery needs to be lowered to a safe level; at this time, the discharge of the power battery is controlled by the bidirectional DC converter 23 to ensure the safety and controllability of the discharge process.

[0048] In this embodiment, compared with the hardware design scheme of integrating a pre-charge circuit and an active discharge circuit in the high-voltage battery pack, the DC converter 23 of the present application is bidirectional, which can not only charge the power battery but also discharge the power battery; without affecting the original function, the weight and volume of the vehicle-mounted power supply system are reduced, and the cost of the vehicle-mounted power supply system is greatly reduced; when the power battery is pre-charged and actively discharged, the function of the DC converter 23 is fully utilized, and the efficiency and reliability of the vehicle-mounted power supply system are improved.

[0049] Please refer to Figure 3 , which shows a high-voltage power supply box arrangement schematic provided by the present application, through

[0050] The vehicle-mounted power supply system integrates the BMC (battery management controller), BJB (battery current collecting box), OBC (on-board charger), DC / DC (direct current converter), and PDU (power distribution unit) in the Power Box (high-voltage power supply box), and adopts a highly integrated scheme to further combine the main circuit (i.e., the high-voltage main circuit) and the control board (i.e., the control module) to save costs and achieve miniaturization and light weight. In this way, the cost can be significantly reduced, and the product size can be reduced.

[0051] Here, the Power Box is integrated with the power battery pack of the electric vehicle and is located below the rear seats of the electric vehicle. Referring to the direction of the vehicle moving forward, the cell stack in the power battery is arranged on the left side, and the Power Box in the power battery is arranged on the right side. The Power Box is arranged in this way, so that after the rear seat is removed, the Power Box can be seen, which is convenient for subsequent maintenance and maintenance.

[0052] Please refer to 4, which shows a new and old comparison chart of a vehicle power supply system provided in the application. The left part of the chart is the old vehicle power supply system, and the right part is the new vehicle power supply system. The new vehicle power supply system has the following advantages:

[0053] First, the BMC, BJB, OBC, DC / DC, and PDU are physically integrated together. Through the connection mode of internal busbars or signal plug-in strips, the original expensive high-voltage connectors, high-voltage wiring harnesses, low-voltage connectors, and low-voltage wiring harnesses are replaced. In this way, the use amount of wiring harnesses and connectors is greatly reduced, and the cost is reduced.

[0054] Second, the BMC, BJB, OBC, DC / DC, and PDU are physically integrated together. Through the shared mechanical housing and cooling system, the cost is reduced.

[0055] Third, the OBC and DC / DC are physically integrated together. Through the sharing of part of the components of the main circuit (multiplexing high-voltage filter components, transformer components, power switches, and drivers, passive discharge components, etc.), the cost is also reduced.

[0056] Fourth, the BMC, OBC, and DC / DC are physically integrated together. Through the sharing of control boards (i.e., master control modules), multiplexing microcontrollers, auxiliary power supplies, CAN transceivers, and other elements, the cost is also reduced. Among them, the "3-in-1 control board" corresponds to Figure 4 a control module (processor) that simultaneously implements battery management controller, vehicle charger, and DC converter control and management.

[0057] Fifth, the BJB and DC / DC are physically integrated together. The existing DC / DC is changed from "one-way DC / DC" to "bidirectional DC / DC". Through the bidirectional DC / DC, the "pre-charge" function and the "active discharge" function are realized to eliminate the pre-charge circuit and the active discharge circuit in the original BJB circuit.

[0058] Through the above-mentioned manner, the vehicle power supply system corresponding to the new scheme has the following advantages compared with the original vehicle power supply system. The main circuit includes the high-voltage filter components, transformer components, power switches, drivers, and discharge components of the vehicle charger and the DC converter.

[0059] Optionally, in some embodiments, the main circuit is an integrated vehicle charger, which includes multiplexing devices required for the operation of the DC converter. The multiplexing devices include high-voltage filter components, transformer components, power switches, driver components, and discharge components.

[0060] That is Figure 4The 2-in-1 main circuit in the vehicle-mounted charger (OBC) and the DC / DC converter (DCDC) function multiplexing, simplifying the circuit structure, and improving energy utilization efficiency. For example, the high-voltage filter assembly is used to filter out high-frequency noise and interference on the high-voltage battery port side, ensuring stable operation of the circuit. When OBC and DCDC are working, the high-voltage filter can effectively work to filter out the interference on the high-voltage battery port side.

[0061] The transformer assembly is used for electrical isolation and voltage regulation when OBC and DCDC are working to meet the needs of different electrical systems of the vehicle.

[0062] The power switch tube plays a switching role in the circuit, controls the on-off of the current, and realizes efficient conversion of electric energy. The power switch tube can quickly respond to the control signal and accurately control the flow of current when OBC and DCDC are working.

[0063] The drive assembly provides control signals for the power switch tube to ensure that they work according to the predetermined timing and logic. The design of the drive assembly takes into account the different working needs of OBC and DCDC, and can generate corresponding control signals to realize seamless switching of functions.

[0064] The discharge assembly safely discharges residual charge in the circuit when needed to prevent electric shock or other safety issues. The discharge assembly generally works after the high-voltage power of the whole vehicle is turned off to ensure the safety of the circuit.

[0065] In this embodiment, through the close cooperation of the 2-in-1 main circuit, the functions of OBC and DCDC are multiplexed. This design not only reduces the cost of hardware, but also reduces the size of hardware.

[0066] In other embodiments, when the battery management controller, vehicle-mounted charger and DC / DC converter share a control module, multiplexing microcontrollers, auxiliary power supplies and CAN transceivers and other elements is an efficient and economical solution. This design strategy not only simplifies the circuit structure, reduces the complexity of hardware, and reduces costs, but also improves the integration and reliability of the system.

[0067] Microcontroller multiplexing: On the shared control board (i.e. control module), a high-performance MCU can manage the functions of BMC, OBC and DC / DC at the same time, and can perform different tasks through programming and configuration, including battery state monitoring, charging control, DC voltage conversion, etc.

[0068] Multiplexing MCU reduces hardware costs, and in addition, a unified control strategy helps optimize overall performance and ensure coordinated work between modules.

[0069] Auxiliary power multiplexing: provides stable power supply for all elements on the control board, through optimized design, can meet the power demand of BMC, OBC and DC / DC.

[0070] Multiplexing auxiliary power reduces the number of power modules, reduces cost, and unified power management also helps to ensure the reliability of the system.

[0071] CAN transceiver multiplexing: CAN bus as an important communication protocol inside the vehicle, used to realize data transmission and coordination between different modules, multiplexing CAN transceiver simplifies the communication interface, reduces the wiring complexity, at the same time, the high speed, real-time and reliable characteristics of CAN bus ensure the accuracy and efficiency of data transmission.

[0072] In the above manner, on the one hand, the number of elements is reduced, the material cost is reduced, and the work of maintaining and replacing parts becomes more simple and efficient, which also achieves the purpose of reducing maintenance cost; on the other hand, the circuit structure is simplified, the potential fault points are reduced, and the overall reliability of the vehicle-mounted power supply system is improved; on the other hand, the common control board design makes it easier and more flexible to upgrade or expand the system in the future, which is convenient for upgrading and expanding.

[0073] Optionally, in some embodiments of the first aspect of the application, the control module is a multi-core microcontroller with multiple processing cores, which is configured to respond to task requests by calling processing cores matching the type of the task requests, and the battery management controller, the vehicle-mounted charger and the DC converter each generate task requests of different types.

[0074] Among them, the control module adopts a multi-core architecture with high flexibility and scalability, which can increase or decrease the number of processing cores according to the number of task requests to adapt to different scales and complexity of application scenarios.

[0075] For example, the battery management controller generates task requests related to battery health, charging state, temperature control, etc.; the vehicle-mounted charger generates task requests related to charging protocol, current / voltage regulation, fault detection, etc.; the DC converter generates task requests related to voltage conversion, power distribution, efficiency optimization, etc.

[0076] The multi-core microcontroller invokes the corresponding processing core to respond according to the type and priority of the task request, for example, each processing core can have its specific functions and performance characteristics to adapt to different types of task requests. For example, one processing core is good at processing tasks with high real-time requirements (such as rapid response of battery temperature), and another processing core is more suitable for processing complex algorithms and computing tasks (such as updating of battery management strategy), therefore, matching the appropriate processing core can greatly improve the efficiency of the multi-core microcontroller.

[0077] Specifically, the multi-core microcontroller configures the priority level of each processing core according to the processing performance of each processing core, and responds according to the processing core with a priority level matching the type of the received task request; wherein the priority of the type of the task request corresponds to the priority of the processing core one-to-one, if any task request matches one processing core, the processing core is invoked to respond; if any task request matches multiple processing cores, the processing core with the least number of queued task requests is selected to respond; if any task request only matches one processing core, and the number of currently mounted task requests of the processing core exceeds a preset threshold, the processing core with a higher priority than the priority corresponding to the current task request is selected to respond.

[0078] By matching the task request with the processing core, the efficient use and optimal performance of the multi-core microcontroller resources are ensured, which helps to reduce the delay of task processing and improve the overall response speed of the vehicle-mounted power supply system. If the current load of a processing core is heavy, the multi-core microcontroller can intelligently distribute task requests to other idle or lightly loaded processing cores to maintain the balance and stability of the vehicle-mounted power supply system; at the same time, in order to ensure the safety of task request execution, the processing core with a higher priority than the current task request is selected, thereby also ensuring the safety of the vehicle-mounted power supply system.

[0079] In the embodiment, since a large number of components of originally independent products are reused, the product cost, product size and product weight are obviously optimized, meeting the requirements of low cost, miniaturization and light weight; at the same time, since the PDU originally designed for passive heat dissipation is also integrated into the Power Box, sharing the cooling system, the PDU heat dissipation characteristics are greatly enhanced, which can be compatible with super fast charging of larger current, improving the charging efficiency of the whole vehicle.

[0080] Please refer to Figure 5A new and old pre-charge and discharge scheme comparison chart is provided for the application, the new pre-charge and discharge scheme includes: bidirectional DCDC, first switch, second switch and support capacitor, the positive electrode of the power battery is connected to the first end of the bidirectional DCDC through the first switch, the negative electrode of the power battery is connected to the second end of the bidirectional DCDC through the second switch, and the support capacitor is connected in parallel between the first end and the second end.

[0081] Among them, the first switch and the second switch are used to control the on-off between the power battery and the DCDC converter, because the bidirectional DCDC needs the first switch and the second switch to be in the "off state when realizing "pre-charge" and "active discharge". Through the bidirectional DCDC, energy is transferred from the 12V low-voltage storage battery to the high-voltage support capacitor, so that the voltage of the support capacitor is basically consistent with the voltage of the power battery (corresponding to "pre-charge mode"); through the bidirectional DCDC, high-voltage energy is transferred from the support capacitor to the 12V low-voltage storage battery or directly dissipated on the DCDC switch tube, so that the voltage of the support capacitor is lower than the 60VDC safety voltage (corresponding to "active discharge mode"), thereby assisting the vehicle to realize high-voltage power-on and power-off.

[0082] It should be noted that the support capacitor is connected in parallel between the first end and the second end of the DCDC converter, and here the support capacitor is arranged outside the vehicle-mounted power supply system and is generally integrated in the vehicle electric drive system. For example, the 12V storage battery is always connected in parallel on the low-voltage side of the DCDC, and the high-voltage side of the DCDC is connected to the power battery through a "switch".

[0083] It should be further noted that the DCDC converter can realize bidirectional conversion of direct current voltage, that is, the voltage of the 12V low-voltage storage battery is raised or lowered to meet the needs of different loads; at the same time, the voltage of the 12V low-voltage storage battery is converted into a voltage that the support capacitor can receive, realizing the bidirectional flow of energy.

[0084] In this embodiment, compared with the existing pre-charge and active discharge scheme, the new pre-charge and active discharge scheme changes "unidirectional DC / DC" to "bidirectional DC / DC", and at the same time, the pre-charge circuit and the discharge circuit in the original BJB (battery current collecting box) circuit are omitted, so that the cost and weight of the BJB are obviously reduced.

[0085] The high-voltage power box is integrated in the battery pack where the power battery is located, or the high-voltage power box directly covers the (high-voltage) battery pack or covers the outside of the battery pack through a mounting interface.

[0086] Specifically, the Power Box can be directly integrated in the high-voltage battery pack without a shell, or can have a shell and directly cover the high-voltage battery pack through a mounting interface.

[0087] Optionally, the battery management controller, the battery collection box, the on-board charger, the DC / DC converter and the power distribution unit share a cooling system.

[0088] Specifically, if the high-voltage power box is integrated in the battery pack where the power battery is located, the power battery and the battery management controller, the battery collection box, the on-board charger, the DC / DC converter and the power distribution unit share a cooling system.

[0089] For example, the cooling system includes at least one of air cooling, water cooling, oil cooling, gas cooling and phase change cooling. Air cooling is to blow air through the heat generating components by a fan to take away the heat in the high-voltage power box. Water cooling is to circulate the cooling liquid in the closed pipeline to take away the heat in the high-voltage power box through the heat exchanger. Gas cooling is to use gas (such as nitrogen) for cooling. Phase change cooling is to use the characteristics of the substance absorbing or releasing a large amount of heat during phase change (such as from liquid to solid) to take away the heat in the high-voltage power box.

[0090] Please refer to Figure 6 A cooling schematic diagram of a vehicle-mounted power supply system is provided for the present application, which is described in detail as follows:

[0091] The Power Box is only a module of the entire (high-voltage) battery pack. The Power Box can reuse the cooling water channel of the high-voltage battery pack, or can be designed with an independent cooling water channel to improve the arrangement position of the Power Box in the high-voltage battery pack, such as Figure 6 As shown, the Power Box with an independent cooling water channel can also be stacked on the cell stack, and the arrangement position is more flexible.

[0092] Among them, the fast charging relay in the BJB changes from "two" to "one" (omitting "high-voltage positive relay" or "high-voltage negative relay"), which reduces the cost and miniaturization;

[0093] It should be noted that the OBC and the DC / DC each configure a separate mechanical fuse, which is changed to share one mechanical fuse to reduce the cost and miniaturization.

[0094] It should also be noted that the high-voltage air conditioner and the high-voltage PTC each configure a separate mechanical fuse, which is changed to share one mechanical fuse to reduce the cost and miniaturization.

[0095] The vehicle-mounted power supply system in the application integrates the battery management controller, the battery collection box, the vehicle-mounted charger, the direct current converter and the power distribution unit in the high-voltage power supply box, and the battery management controller, the vehicle-mounted charger and the direct current converter share a control module, and the vehicle-mounted charger and the direct current converter share a main circuit. On the one hand, the same components are reused without affecting the original performance, which greatly reduces the components. On the other hand, by improving the integration of the vehicle-mounted power supply system, the cost of the vehicle-mounted power supply system is reduced, the size of the vehicle-mounted power supply system is reduced, the weight of the vehicle-mounted power supply system is reduced, and the working efficiency of the vehicle-mounted power supply system is improved.

[0096] Please refer to Figure 7 A flow chart of a control method based on a vehicle-mounted power supply system is provided in the application, the vehicle-mounted power supply system includes a power battery, a high-voltage power supply box electrically connected with the power battery, and a battery management controller, a battery collection box, a vehicle-mounted charger, a direct current converter and a power distribution unit integrated in the high-voltage power supply box and directly connected with the power battery through a high-voltage busbar; the battery management controller, the vehicle-mounted charger and the direct current converter share a control module, and the vehicle-mounted charger and the direct current converter share a main circuit; wherein the control method comprises:

[0097] Step S701, using the control module to monitor the state data of the power battery in real time, managing the power battery according to the state data, so that the power distribution unit completes the power distribution of external high-voltage loads;

[0098] Step S702, if a charging request is received, a first loop connecting the power battery and the vehicle-mounted charger is formed through the main circuit to charge the power battery;

[0099] Step S703, if a voltage conversion request is received, a second loop connecting the power battery and the direct current converter is formed through the main circuit to convert the input or output direct current voltage.

[0100] It should be further pointed out that the vehicle-mounted power supply system and the control method based on the vehicle-mounted power supply system have a one-to-one correspondence. Here, the technical details and technical effects involved in the control method based on the vehicle-mounted power supply system are the same as those of the above-mentioned vehicle-mounted power supply system, and will not be described here. Please refer to the above-mentioned vehicle-mounted power supply system.

[0101] The application is based on a control method of a vehicle-mounted power supply system, by integrating a battery management controller, a battery collecting box, a vehicle-mounted charger, a direct current converter and a power distribution unit in a high-voltage power supply box, and by sharing a control module by the battery management controller, the vehicle-mounted charger and the direct current converter, and by sharing a main circuit by the vehicle-mounted charger and the direct current converter, on one hand, by multiplexing the same components, the components are greatly reduced without affecting the original performance; on the other hand, by improving the integration of the vehicle-mounted power supply system, the cost of the vehicle-mounted power supply system is reduced, the size of the vehicle-mounted power supply system is reduced, at the same time, the weight of the vehicle-mounted power supply system is reduced, and the working efficiency of the vehicle-mounted power supply system is improved.

[0102] In another embodiment of the application, the embodiment also provides an electric vehicle for executing the vehicle-mounted power supply system described in some embodiments or some embodiments described above, which will not be repeated here.

[0103] The above embodiments only exemplarily illustrate the principles and effects of the application, and are not used to limit the application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the application. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought of the application should be covered by the claims of the application.

Claims

1. A vehicle-mounted power supply system characterized by comprising: The power battery, a high-voltage power supply box electrically connected with the power battery, and a battery management controller, a battery collection box, an on-board charger, a direct current converter and a power distribution unit integrated in the high-voltage power supply box are provided. The battery management controller, the on-board charger and the direct current converter share a control module, and the on-board charger and the direct current converter share a main circuit. The control module is configured to form a first loop connecting the power battery and the on-board charger through the main circuit to charge the power battery if a charging request is received, and form a second loop connecting the power battery and the direct current converter through the main circuit to convert the input or output direct current voltage if a voltage conversion request is received. The control module is further configured to monitor state data of the power battery in real time, manage the power battery according to the state data, and enable the power distribution unit to complete power distribution.

2. The vehicle-mounted power supply system according to claim 1, characterized by, The control module includes a multi-core microcontroller including multiple processing cores. The multi-core microcontroller is configured to respond to a task request by calling a processing core matching the type of the task request. The battery management controller, the on-board charger and the direct current converter each generate different types of task requests.

3. The vehicle-mounted power supply system according to claim 2, characterized by, The multi-core microcontroller configures a priority level of each processing core according to the processing performance of the processing core, and responds to the processing core matching the priority level according to the type of the received task request. The priority level of the type of the task request corresponds to the priority level of the processing core one by one. If any task request matches a processing core, the processing core is called to respond. If any task request matches multiple processing cores, the processing core with the least number of queued task requests is selected to respond. If any task request only matches one processing core, and the number of currently mounted task requests of the processing core exceeds a preset threshold, the processing core with a higher priority level than the priority level corresponding to the current task request is selected to respond.

4. The vehicle-mounted power supply system according to claim 1, characterized by, The direct current converter includes a bidirectional DCDC, and the battery collection box pre-charges or actively discharges the power battery through the bidirectional DCDC.

5. The vehicle-mounted power supply system according to claim 4, characterized by The direct current converter further includes a first switch, a second switch and a support capacitor. The positive electrode of the power battery is connected to a first end of the bidirectional DCDC through the first switch, the negative electrode of the power battery is connected to a second end of the bidirectional DCDC through the second switch, and the support capacitor is arranged outside the on-board power supply system and is connected in parallel between the first end and the second end.

6. The vehicle-mounted power supply system according to claim 1, characterized by The battery management controller, the battery collection box, the on-board charger, the direct current converter and the power distribution unit share a cooling system, and the cooling system includes at least one of air cooling, water cooling, oil cooling, gas cooling and phase change cooling.

7. The vehicle-mounted power supply system according to claim 1, characterized by If the high-voltage power supply box is integrated in the battery pack where the power battery is located, the power battery, the battery management controller, the battery current collecting box, the on-board charger, the DC converter and the power distribution unit share a cooling system.

8. The vehicle-mounted power supply system according to any one of claims 1 to 7, characterized by, The battery management controller, the battery current collecting box, the on-board charger, the DC converter and the power distribution unit are integrated in the high-voltage power supply box through a signal plug-in row or a high-voltage busbar.

9. A control method of a vehicle-mounted power supply system, characterized by, The on-board power supply system comprises a power battery, a high-voltage power supply box electrically connected to the power battery, and a battery management controller, a battery current collecting box, an on-board charger, a DC converter and a power distribution unit integrated in the high-voltage power supply box; the battery management controller, the on-board charger and the DC converter share a control module, and the on-board charger and the DC converter share a main circuit; the high-voltage power supply box is integrated in the battery pack where the power battery is located, or the high-voltage power supply box is covered on the battery pack through a mounting interface; wherein the control method comprises: Real-time monitoring of the state data of the power battery by the control module, management of the power battery according to the state data, so that the power distribution unit completes the power distribution of external high-voltage loads; If a charging request is received, a first loop connecting the power battery and the on-board charger is formed through the main circuit to charge the power battery; If a voltage conversion request is received, a second loop connecting the power battery and the DC converter is formed through the main circuit to convert the input or output DC voltage.

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