Battery management device, control method, and battery management system

Abstract

The application discloses a battery management device, a control method and a battery management system. The battery management device comprises a battery management system and a thermal management system. The thermal management system comprises at least a first power thermal management unit and a second power thermal management unit. The battery management system is in communication connection with the first power thermal management unit, and the first power thermal management unit is in communication connection with the second power thermal management unit. The application solves the technical problem of complex control logic and large power consumption in the related art that the power battery thermal management adopts a multi-connected mode to realize the cooling of the battery.

Description

Technical Field

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

[0002] Existing pure electric logistics vehicles, heavy-duty trucks, and light-duty trucks primarily employ external thermal management systems (TMS) for cooling their power batteries, including water-cooled units. However, due to the increasing energy density of batteries, the cooling capacity of a single unit is no longer sufficient to meet the battery's cooling requirements.

[0003] Currently, most TMS control systems on the market adopt a multi-unit system structure, which is two independent water-cooled units connected in parallel. Figure 1 This is a topology diagram for parallel control of a power battery thermal management unit based on existing technology, such as... Figure 1 As shown, two independent water-cooled units are connected in parallel. The Battery Management System (BMS) controller controls both units 1 and 2 simultaneously via BMS_CAN communication and enable signals. The host computer (BMS) controls the multi-unit TMS via the CAN network, requiring the allocation of two receive IDs (TMS information feedback IDs) and two transmit IDs (BMS information transmission IDs), thus complicating the control logic.

[0004] Figure 2 This is a flowchart of a parallel cooling control system for a power battery thermal management unit based on existing technology, such as... Figure 2 As shown, two independent water-cooled units are connected in parallel. After the TMS receives the cooling command from the BMS, it starts TMS1 and TMS2 simultaneously for cooling based on the target cooling temperature and the current coolant temperature, which results in a large power consumption.

[0005] The aforementioned technologies for power battery thermal management employ multi-unit systems to achieve battery cooling, but this approach suffers from complex control logic and high power consumption, and no effective solution has yet been proposed. Summary of the Invention

[0006] This invention provides a battery management device, control method, and battery management system to at least address the technical problems in related technologies where power battery thermal management uses a multi-unit system to achieve battery cooling, resulting in complex control logic and high power consumption.

[0007] According to one aspect of the present invention, a battery management device is provided, comprising: a battery management system and a thermal management system, wherein the thermal management system includes at least a first power thermal management unit and a second power thermal management unit, the battery management system being communicatively connected to the first power thermal management unit, and the first power thermal management unit being communicatively connected to the second power thermal management unit.

[0008] Optionally, the battery management system includes a vehicle low-voltage power supply module and a battery management system controller, wherein the vehicle low-voltage power supply module is connected to the battery management system controller, the first power thermal management unit, and the second power thermal management unit, respectively.

[0009] Optionally, the battery management system controller communicates with the first power thermal management unit via a first CAN bus and a first enable line, and the second power thermal management unit communicates with the first power thermal management unit via a second CAN bus and a second enable line.

[0010] Optionally, the battery management system further includes a vehicle high-voltage power supply module, the first power thermal management unit further includes a first high-voltage pre-charge module, and the second power thermal management unit further includes a second high-voltage pre-charge module. The vehicle high-voltage power supply module is connected to the first high-voltage pre-charge module and the second high-voltage pre-charge module respectively, and is used to provide high-voltage power to the first high-voltage pre-charge module and the second high-voltage pre-charge module.

[0011] Optionally, the first power thermal management unit further includes a first DC-DC module, a first condenser fan, a first wireless module, a first electric water pump, and a first compressor; the second power thermal management unit further includes a second DC-DC module, a second condenser fan, a second wireless module, a second electric water pump, and a second compressor; wherein the first compressor and the first DC-DC module are respectively connected to the first high-pressure pre-charge module; the first DC-DC module is respectively connected to the first condenser fan, the first wireless module, the first electric water pump, and the first compressor; the second compressor and the second DC-DC module are respectively connected to the second high-pressure pre-charge module; and the second DC-DC module is respectively connected to the second condenser fan, the second wireless module, the second electric water pump, and the second compressor.

[0012] Optionally, the battery management system further includes a vehicle high-voltage power supply module, and the first power thermal management unit further includes a first high-voltage pre-charge module, wherein the vehicle high-voltage power supply module is connected to the first high-voltage pre-charge module and is used to supply high-voltage power to the first high-voltage pre-charge module.

[0013] Optionally, the first power thermal management unit further includes a first DC-DC module, a first condenser fan, a first wireless module, a first electric water pump, and a first compressor; the second power thermal management unit further includes a second condenser fan, a second wireless module, a second electric water pump, and a second compressor; wherein the first compressor, the second compressor, and the first DC-DC module are respectively connected to the first high-pressure pre-charge module; the first DC-DC module is respectively connected to the first condenser fan, the first wireless module, the first electric water pump, and the first compressor; and the first DC-DC module is also respectively connected to the second condenser fan, the second wireless module, the second electric water pump, and the second compressor.

[0014] According to another aspect of the present invention, a control method for a battery management device as described above is also provided, comprising: determining the required cooling capacity of the battery management system; determining whether the required cooling capacity is greater than the maximum cooling capacity of any power thermal management unit in the thermal management system; if the required cooling capacity is less than or equal to the maximum cooling capacity of any power thermal management unit in the thermal management system, then activating any power thermal management unit in the thermal management system; if the required cooling capacity is greater than the maximum cooling capacity of any power thermal management unit in the thermal management system, then activating at least two power thermal management units in the thermal management system.

[0015] Optionally, determining the required cooling capacity of the battery management system includes: obtaining the target cooling temperature of the battery management system and the coolant temperature of the thermal management system; and obtaining the required cooling capacity of the battery management system based on the target cooling temperature and the coolant temperature.

[0016] According to another aspect of the present invention, a battery management system is also provided, comprising: a battery management device as described in any of the preceding embodiments; and a controller, communicatively connected to the battery management device, for executing the control method described above.

[0017] According to another aspect of the present invention, a computer-readable storage medium is also provided, the computer-readable storage medium including a stored program, wherein, when the program is executed, it controls the device where the computer-readable storage medium is located to perform the control method described in any one of the above.

[0018] In this embodiment of the invention, the battery management device includes a battery management system and a thermal management system. The thermal management system includes at least a first power thermal management unit and a second power thermal management unit. The battery management system is communicatively connected to the first power thermal management unit, and the first power thermal management unit is communicatively connected to the second power thermal management unit. The battery management device can achieve the cooling requirements of the battery using a master-slave control method, thereby effectively reducing the battery's power consumption, the complexity of the product control logic, and the product cost. This solves the technical problem in related technologies where the power battery thermal management uses a multi-unit method to achieve the cooling requirements of the battery, which has complex control logic and high power consumption. Attached Figure Description

[0019] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0020] Figure 1 This is a topology diagram for parallel control of a power battery thermal management unit based on existing technology;

[0021] Figure 2 This is a flowchart of a parallel cooling control system for a power battery thermal management unit based on existing technology;

[0022] Figure 3 This is a schematic diagram of a battery management device according to an embodiment of the present invention;

[0023] Figure 4 This is a flowchart of a control method for a battery management device according to any one of the above embodiments of the present invention;

[0024] Figure 5 This is a master-slave control topology diagram of a power battery thermal management unit according to an optional embodiment of the present invention;

[0025] Figure 6 This is a master-slave control circuit diagram of a power battery thermal management unit according to an optional embodiment of the present invention;

[0026] Figure 7 This is another master-slave control circuit diagram for a power battery thermal management unit according to an optional embodiment of the present invention;

[0027] Figure 8 This is a flowchart of the master-slave control cooling process of the power battery thermal management unit according to an optional embodiment of the present invention.

[0028] The above figures include the following reference numerals:

[0029] 30. Battery Management System; 32. Thermal Management System; 321. First Power Thermal Management Unit; 322. Second Power Thermal Management Unit. Detailed Implementation

[0030] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0031] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0032] Example 1

[0033] According to one aspect of the present invention, a battery management device is provided. Figure 3 This is a schematic diagram of a battery management device according to an embodiment of the present invention, such as... Figure 3 As shown, the battery management device includes a battery management system 30 and a thermal management system 32. The thermal management system 32 includes at least a first power thermal management unit 321 and a second power thermal management unit 322. The battery management system 30 is communicatively connected to the first power thermal management unit 321, and the first power thermal management unit 321 is communicatively connected to the second power thermal management unit 322.

[0034] It should be noted that the above-mentioned thermal management system includes, but is not limited to, two power thermal management units. Optionally, the above-mentioned thermal management system includes at least a first power thermal management unit and a second power thermal management unit, wherein the first power thermal management unit is the control master and the second power thermal management unit is the control slave, thereby forming a master-slave control mode.

[0035] In practical implementation, the first power thermal management unit (control master) can be controlled independently via CAN communication and enable signals. The first power thermal management unit (control master) can then independently control the second power thermal management unit (control slave). It should be noted that the above master-slave control method only requires configuring one receive ID and one transmit ID, thereby reducing network load and lowering the logic complexity of BMS control TMS.

[0036] In the above embodiments, the battery management device can achieve the cooling requirements of the battery by adopting a master-slave control method, thereby achieving the technical effect of effectively reducing battery power consumption, product control logic complexity and product cost. This solves the technical problem in related technologies where the power battery thermal management adopts a multi-unit method to achieve battery cooling, which has complex control logic and high power consumption.

[0037] Optionally, the battery management system 30 includes a vehicle low-voltage power supply module and a battery management system controller, wherein the vehicle low-voltage power supply module is connected to the battery management system controller, the first power thermal management unit 321, and the second power thermal management unit 322, respectively.

[0038] The aforementioned vehicle low-voltage power supply module can provide a predetermined voltage to the battery management system controller, the first power thermal management unit 321, and the second power thermal management unit 322, respectively. Optionally, the predetermined voltage is 23V.

[0039] Optionally, the battery management system controller communicates with the first power thermal management unit 321 via a first CAN bus and a first enable line, and the second power thermal management unit 322 communicates with the first power thermal management unit 321 via a second CAN bus and a second enable line.

[0040] In practical implementation, a communication connection can be established between the battery management system controller and the first power thermal management unit 321 using a first CAN bus and a first enable line, and a communication connection can be established between the first power thermal management unit 321 and the second power thermal management unit 322 using a second CAN bus and a second enable line. The first CAN bus and the second CAN bus can be used to transmit corresponding CAN signals; the first enable line and the second enable line can be used to transmit corresponding enable signals.

[0041] Optionally, the battery management system also includes a vehicle high-voltage power supply module, the first power thermal management unit 321 also includes a first high-voltage pre-charge module, and the second power thermal management unit 322 also includes a second high-voltage pre-charge module. The vehicle high-voltage power supply module is connected to the first high-voltage pre-charge module and the second high-voltage pre-charge module respectively, and is used to provide high-voltage power to the first high-voltage pre-charge module and the second high-voltage pre-charge module.

[0042] The aforementioned vehicle high-voltage power supply module can provide high-voltage power to the high-voltage pre-charge module. In one optional embodiment, the first power thermal management unit and the second power thermal management unit can each be equipped with a high-voltage pre-charge module. In a specific embodiment, the first power thermal management unit is equipped with a first high-voltage pre-charge module, and the second power thermal management unit is equipped with a second high-voltage pre-charge module. The vehicle high-voltage power supply module can simultaneously provide high-voltage power to both the first and second high-voltage pre-charge modules.

[0043] Optionally, the first power thermal management unit 321 further includes a first DC-DC module, a first condenser fan, a first wireless module, a first electronic water pump, and a first compressor; the second power thermal management unit 322 further includes a second DC-DC module, a second condenser fan, a second wireless module, a second electronic water pump, and a second compressor; wherein the first compressor and the first DC-DC module are respectively connected to the first high-pressure pre-charge module; the first DC-DC module is respectively connected to the first condenser fan, the first wireless module, the first electronic water pump, and the first compressor; the second compressor and the second DC-DC module are respectively connected to the second high-pressure pre-charge module; and the second DC-DC module is respectively connected to the second condenser fan, the second wireless module, the second electronic water pump, and the second compressor.

[0044] The first compressor and the first DC-DC module are respectively connected to the first high-pressure pre-charge module of the first power thermal management unit, and both the first compressor and the first DC-DC module can receive the preset voltage provided by the first high-pressure pre-charge module. Similarly, the second compressor and the second DC-DC module are respectively connected to the second high-pressure pre-charge module of the second power thermal management unit, and both the second compressor and the second DC-DC module can receive the preset voltage provided by the second high-pressure pre-charge module.

[0045] Optionally, both the first DC-DC module and the second DC-DC module can convert the preset voltage into the voltage required by other components. For example, the first DC-DC module can provide the required voltage to the first condenser fan, the first wireless module, the first electronic water pump, and the first compressor, respectively, and the second DC-DC module can provide the required voltage to the second condenser fan, the second wireless module, the second electronic water pump, and the second compressor, respectively.

[0046] It should be noted that in the above embodiments, the components of the first power thermal management unit 321 and the second power thermal management unit 322 are the same.

[0047] Optionally, the battery management system 30 also includes a vehicle high-voltage power supply module, and the first power thermal management unit 321 also includes a first high-voltage pre-charge module, wherein the vehicle high-voltage power supply module is connected to the first high-voltage pre-charge module and is used to provide high-voltage power to the first high-voltage pre-charge module.

[0048] The aforementioned high-voltage power supply module for the entire vehicle can provide high-voltage power to the high-voltage pre-charge module. In another optional embodiment, the first power thermal management unit and the second power thermal management unit are provided with a shared high-voltage pre-charge module. In a specific embodiment, the first power thermal management unit is provided with a first high-voltage pre-charge module, and the second power thermal management unit does not need to be provided with a corresponding high-voltage pre-charge module, thereby reducing the material cost and defect rate of TMS and improving the market competitiveness of TMS products.

[0049] Optionally, the first power thermal management unit 321 further includes a first DC-DC module, a first condenser fan, a first wireless module, a first electronic water pump, and a first compressor; the second power thermal management unit 322 further includes a second condenser fan, a second wireless module, a second electronic water pump, and a second compressor; wherein the first compressor, the second compressor, and the first DC-DC module are respectively connected to the first high-pressure pre-charge module; the first DC-DC module is respectively connected to the first condenser fan, the first wireless module, the first electronic water pump, and the first compressor; and the first DC-DC module is also respectively connected to the second condenser fan, the second wireless module, the second electronic water pump, and the second compressor.

[0050] The first compressor and the second compressor are respectively connected to the first high-pressure pre-charge module of the first power thermal management unit. In addition, the first DC-DC module of the first power thermal management unit is also connected to the first high-pressure pre-charge module. The first compressor, the second compressor, and the first DC-DC module can all receive the preset voltage provided by the first high-pressure pre-charge module.

[0051] Optionally, the first DC-DC module can convert the preset voltage into the voltage required by other components. For example, the first DC-DC module can provide the required voltage to the first condenser fan, the first wireless module, the first electronic water pump, the first compressor, the second condenser fan, the second wireless module, the second electronic water pump, and the second compressor, respectively.

[0052] It should be noted that, in the above embodiments, there are certain differences in the components of the first power thermal management unit 321 and the second power thermal management unit 322.

[0053] Furthermore, both the first and second power thermal management units are equipped with thermal management system controllers. The thermal management system controller in the first power thermal management unit is connected to the first condenser fan, the first wireless module, the first electronic water pump, and the first compressor, respectively, and can be used to control the operating status of these components. Additionally, the thermal management system controller in the first power thermal management unit is connected to the first DC-DC module, and can also be used to control the operating status of the first DC-DC module. Similarly, the thermal management system controller in the second power thermal management unit is connected to the second condenser fan, the second wireless module, the second electronic water pump, and the second compressor, respectively, and can be used to control the operating status of these components. The thermal management system controller in the second power thermal management unit is also connected to the second DC-DC module, and can also be used to control the operating status of the second DC-DC module.

[0054] Example 2

[0055] According to an embodiment of the present invention, an embodiment of a control method for a battery management device according to any of the above-described embodiments is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0056] Figure 4 This is a flowchart of a control method for a battery management device according to any one of the above embodiments of the present invention, such as... Figure 4 As shown, the control method includes the following steps:

[0057] Step S402: Determine the required cooling capacity of the battery management system;

[0058] Step S404: Determine whether the required cooling capacity is greater than the maximum cooling capacity of any power thermal management unit in the thermal management system;

[0059] Step S406: If the required cooling capacity is less than or equal to the maximum cooling capacity of any power thermal management unit in the thermal management system, then any power thermal management unit in the thermal management system shall be turned on.

[0060] Step S408: If the required cooling capacity is greater than the maximum cooling capacity of any power thermal management unit in the thermal management system, then at least two power thermal management units in the thermal management system shall be turned on.

[0061] The above implementation steps can be executed by the thermal management system controller, which can be the thermal management system controller of any power thermal management unit in the thermal management system.

[0062] In one optional embodiment, the thermal management system adopts a master-slave working mode. When the cooling demand of the battery is less than the maximum cooling capacity of a single compressor, a single power thermal management unit is turned on for cooling, thereby reducing the power consumption of the thermal management system.

[0063] Optionally, determining the required cooling capacity of the battery management system includes: obtaining the target cooling temperature of the battery management system and the coolant temperature of the thermal management system; and obtaining the required cooling capacity of the battery management system based on the target cooling temperature and the coolant temperature.

[0064] Through the above implementation method, the required cooling capacity of the battery management system can be accurately calculated by using the cooling target temperature of the battery management system and the coolant temperature of the thermal management system, so as to facilitate subsequent adjustment of the power thermal management unit in the thermal management system.

[0065] Example 3

[0066] According to another aspect of the present invention, a battery management system is also provided, the battery management system comprising: a battery management device of any of the above; and a controller, communicatively connected to the battery management device, for executing the control method described above.

[0067] Example 4

[0068] According to another aspect of the present invention, a computer-readable storage medium is also provided, the computer-readable storage medium including a stored program, wherein, when the program is executed, it controls the device where the computer-readable storage medium is located to perform any of the control methods described above.

[0069] The following is a detailed description of an optional embodiment of the present invention.

[0070] Figure 5 This is a master-slave control topology diagram of a power battery thermal management unit according to an optional embodiment of the present invention, such as... Figure 5 As shown, a master-slave control architecture is used. Specifically, the BMS controller independently controls the TMS master through BMS_CAN communication and enable signals, and the master then independently controls the TMS slave.

[0071] It should be noted that the TMS master-slave control method only requires the allocation of one receive ID and one send ID, which reduces the load on the BMS CAN network and lowers the complexity of the BMS control logic for the TMS.

[0072] Figure 6This is a master-slave control circuit diagram of a power battery thermal management unit according to an optional embodiment of the present invention, such as... Figure 6 As shown, the main components of the main unit include a high-voltage pre-charge module, a compressor, a DC-DC high-voltage to low-voltage 24V module, a TMS controller, a condenser fan, a wireless module, and an electric water pump. The components of the TMS slave unit are the same as those of the TMS main unit.

[0073] Figure 7 This is another master-slave control circuit diagram for a power battery thermal management unit according to an optional embodiment of the present invention, such as... Figure 7 As shown, the main components of the TMS main unit include a high-voltage precharge module, a compressor, a DC-DC high-voltage to low-voltage 24V module, a TMS controller, a condenser fan, a wireless module, and an electric water pump. The main components of the TMS slave unit include a compressor, a TMS controller, a condenser fan, and an electric water pump.

[0074] Among them, the DC / DC module is a high-voltage to low-voltage 24V circuit module, providing 24V load power to the TMS; the compressor provides the cooling source for the TMS; the TMS controller controls and communicates with the BMS; the electronic water pump provides circulation for the antifreeze; the fan provides condensing air for the compressor cooling; the wireless module provides a wireless control channel for the TMS; the TMS master and slave share the high-voltage precharge module and the DC / DC module.

[0075] It should be noted that the master-slave control method of TMS reduces one high-voltage pre-charge module and one DC-DC module compared to the multi-unit control method, thereby reducing the material cost and defect rate of TMS and improving the market competitiveness of TMS products.

[0076] Figure 8 This is a flowchart of the master-slave control cooling process of the power battery thermal management unit according to an optional embodiment of the present invention, such as... Figure 8 As shown, after receiving the cooling command from the BMS, the TMS calculates the required cooling capacity based on the target cooling temperature and the current coolant temperature. When the cooling capacity is greater than that of a single TMS compressor, both the master and slave units start cooling; when the cooling capacity is less than that of a single TMS compressor, only one TMS compressor is activated. The cooling efficiency is relatively low when the compressor operates at low power. Therefore, when the cooling demand is small, operating two TMS compressors simultaneously is far less efficient than operating a single TMS compressor.

[0077] It should be noted that the TMS adopts a master-slave working mode. When the cooling capacity required by the battery is less than the maximum cooling capacity of a single compressor, only one TMS is turned on for cooling, which reduces the power consumption of the TMS.

[0078] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0079] In the above embodiments of the present invention, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0080] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units can be a logical functional division, and in actual implementation, there may be other division methods. For instance, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling, direct coupling, or communication connection may be through some interfaces; the indirect coupling or communication connection between units or modules may be electrical or other forms.

[0081] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0082] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0083] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.

[0084] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A management device of a battery, characterized by, The battery management system and the thermal management system, wherein the thermal management system at least includes a first power thermal management unit and a second power thermal management unit, the battery management system is in communication connection with the first power thermal management unit, and the first power thermal management unit is in communication connection with the second power thermal management unit; The battery management system includes a whole vehicle low-voltage power supply module and a battery management system controller, wherein the whole vehicle low-voltage power supply module is connected with the battery management system controller, the first power thermal management unit and the second power thermal management unit respectively; The control method of the battery management device includes: Determining the required refrigeration capacity of the battery management system; Judging whether the required refrigeration capacity is greater than the maximum refrigeration capacity of any power thermal management unit in the thermal management system; In the case that the required refrigeration capacity is less than or equal to the maximum refrigeration capacity of any power thermal management unit in the thermal management system, any power thermal management unit in the thermal management system is started; In the case that the required refrigeration capacity is greater than the maximum refrigeration capacity of any power thermal management unit in the thermal management system, at least two power thermal management units in the thermal management system are started; Determining the required refrigeration capacity of the battery management system includes: Obtaining the refrigeration target temperature of the battery management system and the cooling liquid temperature of the thermal management system; According to the refrigeration target temperature and the cooling liquid temperature, the required refrigeration capacity of the battery management system is obtained. The battery management system controller is in communication connection with the first power thermal management unit through a first CAN bus and a first enable line, and the second power thermal management unit is in communication connection with the first power thermal management unit through a second CAN bus and a second enable line.

2. The apparatus of claim 1, wherein, The battery management system further includes a whole vehicle high-voltage power supply module, the first power thermal management unit further includes a first high-voltage pre-charging module, and the second power thermal management unit further includes a second high-voltage pre-charging module, wherein the whole vehicle high-voltage power supply module is connected with the first high-voltage pre-charging module and the second high-voltage pre-charging module respectively, and is used for high-voltage power supply for the first high-voltage pre-charging module and the second high-voltage pre-charging module.

3. The apparatus of claim 2, wherein, The first power thermal management unit further includes a first DCDC module, a first condensing fan, a first wireless module, a first electronic water pump and a first compressor, and the second power thermal management unit further includes a second DCDC module, a second condensing fan, a second wireless module, a second electronic water pump and a second compressor; wherein the first compressor and the first DCDC module are connected with the first high-voltage pre-charging module respectively, the first DCDC module is connected with the first condensing fan, the first wireless module, the first electronic water pump and the first compressor respectively, the second compressor and the second DCDC module are connected with the second high-voltage pre-charging module respectively, and the second DCDC module is connected with the second condensing fan, the second wireless module, the second electronic water pump and the second compressor respectively.

4. The apparatus of claim 3, wherein, ​ 5. The apparatus of claim 2, wherein, The battery management system further comprises a whole vehicle high-voltage power supply module, and the first power thermal management unit further comprises a first high-voltage pre-charging module, wherein the whole vehicle high-voltage power supply module is connected with the first high-voltage pre-charging module and is used for high-voltage power supply for the first high-voltage pre-charging module.

6. The apparatus of claim 5, wherein, The first power thermal management unit further comprises a first DCDC module, a first condensing fan, a first wireless module, a first electronic water pump and a first compressor, and the second power thermal management unit further comprises a second condensing fan, a second wireless module, a second electronic water pump and a second compressor; wherein the first compressor, the second compressor and the first DCDC module are connected with the first high-voltage pre-charging module respectively, the first DCDC module is connected with the first condensing fan, the first wireless module, the first electronic water pump and the first compressor respectively, and the first DCDC module is further connected with the second condensing fan, the second wireless module, the second electronic water pump and the second compressor respectively.

7. A battery management system, characterized by, The battery management system further comprises a whole vehicle high-voltage power supply module, and the first power thermal management unit further comprises a first high-voltage pre-charging module, wherein the whole vehicle high-voltage power supply module is connected with the first high-voltage pre-charging module and is used for high-voltage power supply for the first high-voltage pre-charging module. The battery management system further comprises a whole vehicle high-voltage power supply module, and the first power thermal management unit further comprises a first high-voltage pre-charging module, wherein the whole vehicle high-voltage power supply module is connected with the first high-voltage pre-charging module and is used for high-voltage power supply for the first high-voltage pre-charging module. The battery management system further comprises a whole vehicle high-voltage power supply module, and the first power thermal management unit further comprises a first high-voltage pre-charging module, wherein the whole vehicle high-voltage power supply module is connected with the first high-voltage pre-charging module and is used for high-voltage power supply for the first high-voltage pre-charging module.

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