Hybrid battery system control method and device, vehicle and storage medium

Abstract

The invention relates to the technical field of vehicle battery management, and discloses a control method and device of a hybrid battery system, a vehicle and a storage medium, the advantages of each battery system are brought into full play by combining a first battery system and a second battery system of different types, and the shortages of the battery systems are made up. Moreover, by switching the on-off states of the power module, the first switch group, the second switch group and the third switch group, at least one of the first battery system and the second battery system can be used for supplying power to at least one of the first electric driving system and the second electric driving system, and various driving requirements of the vehicle electric driving system are met. When the electric quantity of the battery system is low, the cruising ability of the vehicle is guaranteed by charging the first battery system and the second battery system. Parallel connection between the first battery system and the second battery system can be achieved without DCDC, the cost of the battery pack is greatly reduced, and the space utilization rate of the battery pack is improved.

Description

Technical Field

[0001] This invention relates to the field of vehicle battery management technology, and more specifically to control methods, devices, vehicles, and storage media for hybrid battery systems. Background Technology

[0002] There are currently two commonly used types of power batteries for new energy vehicles: lithium iron phosphate batteries and ternary lithium batteries. Each type has its advantages and disadvantages. Lithium iron phosphate batteries are inexpensive and safe, but suffer from low energy density and poor low-temperature performance. Ternary lithium batteries have high energy density and good low-temperature performance, but are more expensive and less safe than lithium iron phosphate batteries. Besides these two types of cells, high-energy-density semi-solid-state and solid-state batteries are also important. While semi-solid-state and solid-state batteries have high energy density, they suffer from poor power performance and higher costs. How to combine these two types of batteries to maximize the advantages of both is currently a major research direction in the industry.

[0003] Currently, existing technologies mainly combine two types of batteries, namely AB batteries, using a series module of lithium iron phosphate batteries and a series module of ternary lithium batteries, which are then connected in parallel to discharge. To ensure voltage balance between the two parallel battery packs, a direct current to direct current converter (DCDC) is required in one of them. However, DCDC converters have high charging and discharging power requirements, resulting in larger size and higher cost. Furthermore, DCDC converters occupy a portion of the battery pack's internal volume, affecting space utilization. Summary of the Invention

[0004] In view of this, the present invention provides a control method, device, vehicle and storage medium for a hybrid battery system to solve the problems of high cost and low space utilization of battery packs caused by the prior art using DC-DC converters to implement AB batteries.

[0005] In a first aspect, the present invention provides a control method for a hybrid battery system. The hybrid battery system includes a first electric drive system, a second electric drive system, a power module, a first switch group, a second switch group, a third switch group, a first battery system, and a second battery system. The power module is connected in parallel to both ends of the first battery system. The two ends of the first electric drive system are connected in parallel to both ends of the power module via the first switch group. The two ends of the second battery system are connected in parallel to both ends of the first electric drive system via the second switch group. The two ends of the second electric drive system are connected in parallel to both ends of the second battery system via the third switch group. The method includes:

[0006] Monitor the first charge level of the first battery system and the second charge level of the second battery system;

[0007] By switching the switching states of the power module, the first switch group, the second switch group and the third switch group, at least one of the first battery system and the second battery system is controlled to supply power to at least one of the first electric drive system and the second electric drive system.

[0008] When the first or second battery level is detected to be below the battery threshold, the first and second battery systems are charged.

[0009] This application combines different types of first and second battery systems to fully utilize the strengths of each system and compensate for its weaknesses. Furthermore, by switching the switching states of the power module, the first switch group, the second switch group, and the third switch group, at least one of the first and second battery systems can be used to power at least one of the first and second electric drive systems, meeting various driving requirements of the vehicle's electric drive system. When the battery system's charge is low, charging the first and second battery systems ensures the vehicle's range. This application achieves parallel connection between the first and second battery systems without the need for a DC-DC converter, significantly reducing battery pack costs and improving battery pack space utilization.

[0010] In one alternative embodiment, the hybrid battery system further includes an energy storage element, the power module includes a first control switch and a second control switch connected in series, the first electric drive system includes a third control switch and a fourth control switch connected in series, and the first switch group includes a fifth control switch and a sixth control switch.

[0011] The fifth control switch is connected between the first control switch and the third control switch, and the sixth control switch is connected between the second control switch and the fourth control switch;

[0012] One end of the energy storage element is connected between the first control switch and the second control switch, and the other end of the energy storage element is connected between the third control switch and the fourth control switch.

[0013] This application controls the connection structure and current flow between the first battery system and the second battery system by switching the switching states of the first control switch and the second control switch in the power module, the third control switch and the fourth control switch in the first electric drive system, and the fifth control switch and the sixth control switch in the first switch group, so as to achieve voltage balance between the first battery system and the second battery system.

[0014] In one optional implementation, by switching the switching states of the power module, the first switch group, the second switch group, and the third switch group, at least one of the first battery system and the second battery system is controlled to supply power to at least one of the first electric drive system and the second electric drive system, including:

[0015] The first switch group is opened, and the second and third switch groups are closed, so that the second battery system can supply power to the first and second electric drive systems.

[0016] Alternatively, the second switch group, the first control switch, and the second control switch can be opened, and the first switch group and the third switch group can be closed, so as to power the first electric drive system using the first battery system and to power the second electric drive system using the second battery system.

[0017] Alternatively, the fifth control switch can be opened, and the sixth control switch, the second switch group, and the third switch group can be closed. The first control switch and the second control switch can be used to control the first battery system and the second battery system to supply power to the second electric drive system.

[0018] This application controls the second battery system to supply power to the first and second electric drive systems independently, the first battery system to supply power to the first electric drive system independently, the second battery system to supply power to the second electric drive system independently, or the first and second battery systems to supply power to the second electric drive system simultaneously by switching the switching states of each control switch in the hybrid battery system. This achieves multiple power supply modes, thereby utilizing the advantages of the first and second battery systems to meet the various driving needs of the vehicle's electric drive system.

[0019] In one optional implementation, when a first battery level or a second battery level is detected to be below a battery level threshold, charging of the first battery system and the second battery system includes:

[0020] Determine the first voltage of the first battery system and the second voltage of the second battery system;

[0021] When the first battery level is detected to be lower than the battery threshold, the first battery system is charged using an external power supply module;

[0022] When the second battery level is detected to be lower than the battery threshold, based on the relationship between the first voltage and the second voltage, the switching states of the power module, the first switch group, the second switch group, and the third switch group are switched, and the second battery system is charged using the first battery system and the first electric drive system.

[0023] When the first or second battery system has a low charge, this application enables battery charging by switching the on / off states of various control switches in the hybrid battery system, eliminating the need for DC-DC converters for control, resulting in lower costs and higher battery pack space utilization.

[0024] In one optional implementation, based on the magnitude relationship between the first voltage and the second voltage, the switching states of the power module, the first switch group, the second switch group, and the third switch group are switched, and the second battery system is charged using the first battery system and the first electric drive system, including:

[0025] The fifth control switch and the third switch group are opened, the sixth control switch and the second switch group are closed, and it is determined whether the first voltage is lower than the second voltage.

[0026] If the first voltage is lower than the second voltage, the first control switch and the fourth control switch are closed to charge the energy storage element using the first battery system.

[0027] If the first voltage is not lower than the second voltage, control the first control switch and the third control switch to close, and use the first battery system to charge the energy storage element and the second battery system;

[0028] When the third voltage of the energy storage element is detected to match the first voltage, the second control switch and the third control switch are closed to charge the second battery system using the energy storage element.

[0029] When the second battery system has a low charge, this application combines the voltage relationship between the first and second battery systems to first control the first battery system to charge the energy storage element, and then uses the energy storage element to charge the second battery system, thereby realizing the charging process of the second battery system. Moreover, voltage balance between the first and second battery systems can be achieved without the need for a DC-DC converter.

[0030] In one alternative implementation, the method further includes:

[0031] Determine the current vehicle status, the first temperature of the first battery system, and the second temperature of the second battery system;

[0032] When the first temperature or the second temperature is detected to be lower than the temperature threshold, the switching states of the power module, the first switch group, the second switch group and the third switch group are switched based on the current vehicle status to heat the first battery system and the second battery system.

[0033] When the temperature of the first and second battery systems is low, this application switches the switching states of the first, second, and third switch groups according to the current vehicle status, and selects a pulse oscillation heating method that matches the current vehicle status to heat the first and second battery systems and maintain the normal operation of the battery systems.

[0034] In one optional embodiment, the hybrid battery system further includes a first capacitor, one end of which is connected between a fifth control switch and a third control switch, and the other end of which is connected between a sixth control switch and a fourth control switch; based on the current vehicle state, the switching states of the power module, the first switch group, the second switch group, and the third switch group are switched to heat the first battery system and the second battery system, including:

[0035] If the current vehicle status is detected as parked, the third switch group is opened, and the first and second switch groups are closed. The power module and the first electric drive system are controlled to perform pulse oscillation to heat the first and second battery systems.

[0036] If the current vehicle status is detected as driving, the first switch group, the second switch group, and the third switch group are closed to control the power module and the first electric drive system to perform pulse oscillation and heat the first battery system and the second battery system.

[0037] In the parked state, this application controls the power module and the first electric drive system to perform pulse oscillation heating by disconnecting the connection between the second battery system and the second electric drive system, thereby improving heating efficiency; in the driving state, the connection between the second battery system and the second electric drive system is maintained, and the second electric drive system is used to ensure the normal driving of the vehicle while pulse oscillation heating is being performed.

[0038] Secondly, the present invention provides a control device for a hybrid battery system. The hybrid battery system includes a first electric drive system, a second electric drive system, a power module, a first switch group, a second switch group, a third switch group, a first battery system, and a second battery system. The power module is connected in parallel to both ends of the first battery system. The two ends of the first electric drive system are connected in parallel to both ends of the power module via the first switch group. The two ends of the second battery system are connected in parallel to both ends of the first electric drive system via the second switch group. The two ends of the second electric drive system are connected in parallel to both ends of the second battery system via the third switch group. The device includes:

[0039] The first processing module is used to monitor the first charge level of the first battery system and the second charge level of the second battery system.

[0040] The second processing module is used to control at least one of the first battery system and the second battery system by switching the switching states of the power module, the first switch group, the second switch group and the third switch group, so as to supply power to at least one of the first electric drive system and the second electric drive system.

[0041] The third processing module is used to charge the first battery system and the second battery system when the first or second battery level is detected to be below the battery level threshold.

[0042] Thirdly, the present invention provides a vehicle comprising: a memory and a processor, the memory and the processor being communicatively connected to each other, the memory storing computer instructions, and the processor executing the computer instructions to perform the control method of the hybrid battery system described in the first aspect or any corresponding embodiment thereof.

[0043] Fourthly, the present invention provides a computer-readable storage medium storing computer instructions for causing a computer to execute the control method of the hybrid battery system described in the first aspect or any corresponding embodiment thereof. Attached Figure Description

[0044] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0045] Figure 1 This is a schematic diagram of the structure of a hybrid battery system according to an embodiment of the present invention;

[0046] Figure 2A This is a structural schematic diagram of a vehicle layout according to an embodiment of the present invention;

[0047] Figure 2B This is a structural schematic diagram of another vehicle layout according to an embodiment of the present invention;

[0048] Figure 2C This is a structural schematic diagram of another vehicle layout according to an embodiment of the present invention;

[0049] Figure 3 This is a schematic diagram of the structure of another hybrid battery system according to an embodiment of the present invention;

[0050] Figure 4 This is a structural schematic diagram of another vehicle layout according to an embodiment of the present invention;

[0051] Figure 5This is a schematic diagram of the structure of another hybrid battery system according to an embodiment of the present invention;

[0052] Figure 6 This is a flowchart illustrating the control method of a hybrid battery system according to an embodiment of the present invention;

[0053] Figure 7 This is a flowchart illustrating a control method for another hybrid battery system according to an embodiment of the present invention;

[0054] Figure 8 This is a flowchart illustrating a control method for another hybrid battery system according to an embodiment of the present invention;

[0055] Figure 9 This is a schematic diagram of the structure of an external power supply module according to an embodiment of the present invention;

[0056] Figure 10 This is a schematic diagram of the structure of the eleventh control switch according to an embodiment of the present invention;

[0057] Figure 11 This is a schematic diagram of the structure of a three-battery system according to an embodiment of the present invention;

[0058] Figure 12 This is a schematic diagram of the structure of a three-electric drive system according to an embodiment of the present invention;

[0059] Figure 13 This is a structural block diagram of the control device for a hybrid battery system according to an embodiment of the present invention;

[0060] Figure 14 This is a schematic diagram of the hardware structure of a vehicle according to an embodiment of the present invention. Detailed Implementation

[0061] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0062] According to embodiments of the present invention, a hybrid battery system is provided, such as... Figure 1 As shown, the hybrid battery system includes a controller (in Figure 1The system comprises a first electric drive system 101 (not shown), a second electric drive system 102, a power module 103, a first switch group 104, a second switch group 105, a third switch group 106, and a first battery system A and a second battery system B of different types. The power module 103 is connected in parallel to the two ends of the first battery system A. The two ends of the first electric drive system 101 are connected in parallel to the two ends of the power module 103 via the first switch group 104. The two ends of the second battery system B are connected in parallel to the two ends of the first electric drive system 101 via the second switch group 105. The two ends of the second electric drive system 102 are connected in parallel to the two ends of the second battery system B via the third switch group 106. The controller for the hybrid battery system can be a vehicle control unit (VCU) or a battery management system (BMS) controller, as long as it can control the hybrid battery system. Specifically, the controller is used for:

[0063] Monitor the first charge level of the first battery system A and the second charge level of the second battery system B;

[0064] By switching the switching states of power module 103, first switch group 104, second switch group 105 and third switch group 106, at least one of the first battery system A and the second battery system B is controlled to supply power to at least one of the first electric drive system 101 and the second electric drive system 102.

[0065] When the first or second battery level is detected to be below the battery threshold, the first battery system A and the second battery system B are charged.

[0066] The hybrid battery system provided in this application uses a first battery system A and a second battery system B of different types as the vehicle's power battery system. By combining battery systems of different types, material systems, or performance characteristics, the advantages of each battery system are fully utilized, and their shortcomings are compensated for. Furthermore, by switching the switching states of the power module 103, the first switch group 104, the second switch group 105, and the third switch group 106, at least one of the first battery system A and the second battery system B can be used to supply power to at least one of the first electric drive system 101 and the second electric drive system 102, ensuring the vehicle's normal power needs. In addition, when the battery system's charge is low, charging the first battery system A and the second battery system B ensures the vehicle's range. This application achieves AB batteries without the need for a DC-DC converter, significantly reducing battery pack costs and improving battery pack space utilization.

[0067] In the embodiments of this application, such as Figure 2AAs shown, the first battery system A and the second battery system B can be arranged alternately in the vehicle. The first electric drive system 101 can be used to drive the front wheels of the vehicle, and the second electric drive system 102 can be used to drive the rear wheels of the vehicle. The arrangement of the first battery system A and the second battery system B in the vehicle can be varied, such as vertical or horizontal arrangement, and this application is not limited to this.

[0068] For example, such as Figure 2B As shown, the first battery system A and the second battery system B can be arranged vertically in the vehicle, wherein the power module 103 is integrated with the first battery system A.

[0069] For example, such as Figure 2C As shown, the first battery system A and the second battery system B can be arranged side by side in the vehicle, wherein the power module 103 is integrated with the first battery system A.

[0070] In some alternative implementations, see again Figure 1 The hybrid battery system also includes an energy storage element L1. The power module 103 includes a first control switch S3-1 and a second control switch S3-2 connected in series. The first electric drive system 101 includes a third control switch (composed of S1-1, S1-2 and S1-3) and a fourth control switch (composed of S1-4, S1-5 and S1-6) connected in series. The first switch group 104 includes a fifth control switch K3 and a sixth control switch K4.

[0071] Specifically, see again Figure 1 The fifth control switch K3 is connected between the first control switch S3-1 and the third control switch, and the sixth control switch K4 is connected between the second control switch S3-2 and the fourth control switch. One end of the energy storage element L1 is connected between the first control switch S3-1 and the second control switch S3-2, and the other end of the energy storage element L1 is connected between the third control switch and the fourth control switch. It should be noted that the energy storage element L1 can be the first inductor, but this application is not limited to this.

[0072] In this embodiment, the third control switch and the fourth control switch are three-phase bridge arm structures. The third control switch is composed of S1-1, S1-2 and S1-3, and the fourth control switch is composed of S1-4, S1-5 and S1-6. S1-1 and S1-4 are connected in series to form the first bridge arm of the first electric drive system 101, S1-2 and S1-5 are connected in series to form the second bridge arm of the first electric drive system 101, and S1-3 and S1-6 are connected in series to form the third bridge arm of the first electric drive system 101. Each bridge arm is connected in parallel to both ends of the first switch group 104.

[0073] In this embodiment, the connection structure and current flow between the first battery system A and the second battery system B are controlled by switching the switching states of the first control switch S3-1 and the second control switch S3-2 in the power module, the third control switch and the fourth control switch in the first electric drive system 101, and the fifth control switch K3 and the sixth control switch K4 in the first switch group, so as to achieve voltage balance between the first battery system A and the second battery system B.

[0074] Specifically, see again Figure 1 The hybrid battery system also includes a first capacitor C1, one end of which is connected between the fifth control switch K3 and the third control switch, and the other end of which is connected between the sixth control switch K4 and the fourth control switch.

[0075] Specifically, see again Figure 1 The hybrid battery system also includes a second capacitor C2, which is connected in parallel across the third switch group 106. The second electric drive system 102 includes a three-phase bridge arm structure, all connected in parallel across the second capacitor C2. S2-1 and S2-4 are connected in series to form the first bridge arm of the second electric drive system 102, S2-2 and S2-5 are connected in series to form the second bridge arm of the second electric drive system 102, and S2-3 and S2-6 are connected in series to form the third bridge arm of the second electric drive system 102. The three ports of the second inductor L2 are respectively connected between S2-1 and S2-4, between S2-2 and S2-5, and between S2-3 and S2-6.

[0076] Specifically, see again Figure 1 The second switch group 105 includes the seventh control switch K1 and the eighth control switch K2, and the third switch group 106 includes the ninth control switch K5 and the tenth control switch K6.

[0077] It should be noted that the embodiment in this application is described using the integrated arrangement of the power module 103 and the first battery system A as an example. However, in some other embodiments, such as Figure 3 As shown, the power module 103 can be directly integrated with the electronic control module within the first electric drive system 101, thereby further reducing battery pack space and lowering costs. Figure 4 As shown, in the overall vehicle layout, the power module 103 can be directly integrated with the first electric drive system.

[0078] It should be noted that this embodiment can utilize the energy storage element L1 to achieve functions such as charging and pulse oscillation of the second battery system B by the first battery system A. For details, please refer to the detailed description of the method embodiment below, which will not be repeated here. Figure 5As shown, a third inductor L3 can be added to the power module 103. One end of the energy storage element L1 is connected between the first control switch S3-1 and the second control switch S3-2 after passing through the third inductor L3. The other end of the energy storage element L1 is connected between the third control switch and the fourth control switch, thereby increasing the charging capacity of the energy storage element L1.

[0079] As an example, for ease of understanding and clear description, the following content in this application will use the following terms: Figure 1 Taking the hybrid battery system shown as an example, the control method of the hybrid battery system of this application will be described.

[0080] According to an embodiment of the present invention, a control method embodiment for a hybrid battery system 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.

[0081] This embodiment provides a control method for a hybrid battery system, which can be used as follows: Figure 1 The hybrid battery system shown, Figure 6 This is a flowchart of a control method for a hybrid battery system according to an embodiment of the present invention, such as... Figure 6 As shown, the process includes the following steps:

[0082] Step S601: Monitor the first charge level of the first battery system and the second charge level of the second battery system.

[0083] Specifically, the current vehicle status can be monitored through the vehicle controller. The current vehicle status includes, but is not limited to, parking status, driving status, and charging status. The specific settings can be configured according to the actual scenario, and this application is not limited to these.

[0084] In this embodiment, when the vehicle is in a parked state, a driving state, or a charging state, the vehicle's BMS system can monitor in real time the first battery system A's first charge, first voltage, and first temperature, as well as the second battery system B's second charge, second voltage, and first temperature, etc., so as to control the power supply process, charging process, low-temperature heating process, and voltage balance between the first battery system A and the second battery system B in subsequent steps.

[0085] Step S602: By switching the switching states of the power module, the first switch group, the second switch group, and the third switch group, at least one of the first battery system and the second battery system is controlled to supply power to at least one of the first electric drive system and the second electric drive system.

[0086] Specifically, see again Figure 1 By switching the switching states of the power module 103, the first switch group 104, the second switch group 105, and the third switch group 106, the connection structure and current flow between the first battery system A, the first electric drive system 101, the second battery system B, and the second electric drive system 102 are regulated, thereby controlling at least one of the first battery system A and the second battery system B to supply power to at least one of the first electric drive system 101 and the second electric drive system 102.

[0087] In this embodiment, by switching the switch state, multiple power supply methods can be achieved, such as the second battery system B supplying power to the first electric drive system 101 and the second electric drive system 102 independently, the first battery system A supplying power to the first electric drive system 101 independently, the second battery system B supplying power to the second electric drive system 102 independently, or the first battery system A and the second battery system B supplying power to the second electric drive system simultaneously. This allows for the use of different types of first battery systems A and B to meet various driving requirements of the vehicle's electric drive system. Parallel connection between the first battery system A and the second battery system B is achieved without the need for a DC-DC converter, resulting in lower costs and improved space utilization of the battery pack.

[0088] Step S603: When the first battery level or the second battery level is detected to be lower than the battery level threshold, the first battery system and the second battery system are charged.

[0089] Specifically, when the vehicle is in parked, driving, or charging mode, if the first battery level of the first battery system A or the second battery level of the second battery system B is detected to be lower than a certain threshold, the first battery system A and the second battery system B will be charged to ensure the vehicle's range. The battery level threshold can be set according to the actual scenario.

[0090] The control method for the hybrid battery system provided in this application combines different types of first battery system A and second battery system B to fully utilize the strengths of each battery system and compensate for its weaknesses. Furthermore, by switching the switching states of power module 103, first switch group 104, second switch group 105, and third switch group 106, at least one of the first battery system A and second battery system B can be used to power at least one of the first electric drive system 101 and second electric drive system 102, meeting various driving requirements of the vehicle's electric drive system. When the battery system charge is low, charging the first battery system A and second battery system B ensures the vehicle's range. This application achieves parallel connection between the first battery system A and second battery system B without the need for a DC-DC converter, significantly reducing battery pack costs and improving battery pack space utilization.

[0091] This embodiment provides a control method for a hybrid battery system, which can be used as follows: Figure 1 The hybrid battery system shown, Figure 7 This is a flowchart of a control method for a hybrid battery system according to an embodiment of the present invention, such as... Figure 7 As shown, the process includes the following steps:

[0092] Step S701: Monitor the first charge level of the first battery system and the second charge level of the second battery system to determine the first voltage of the first battery system and the second voltage of the second battery system. For details, please refer to... Figure 6 The detailed description of step S601 in the illustrated embodiment will not be repeated here.

[0093] Step S702: By switching the switching states of the power module, the first switch group, the second switch group, and the third switch group, at least one of the first battery system and the second battery system is controlled to supply power to at least one of the first electric drive system and the second electric drive system.

[0094] Specifically, step S702 includes:

[0095] In step S7021, the first switch group is opened and the second and third switch groups are closed, so that the second battery system supplies power to the first electric drive system and the second electric drive system.

[0096] Specifically, see again Figure 1 When the second battery system B needs to drive the first electric drive system 101 and the second electric drive system 102 independently, the fifth control switch K3 and the sixth control switch K4 in the first switch group 104 are opened, and the seventh control switch K1 and the eighth control switch K2 in the second switch group 105 and the ninth control switch K5 and the tenth control switch K6 in the third switch group 106 are closed, so that the first electric drive system 101 and the second electric drive system 102 work together.

[0097] Furthermore, the seventh control switch K1, the eighth control switch K2, the ninth control switch K5, and the tenth control switch K6 can be controlled according to actual needs to enable the first electric drive system 101 and the second electric drive system 102 to operate independently. For example, by controlling the seventh control switch K1 and the eighth control switch K2 to be open and controlling the ninth control switch K5 and the tenth control switch K6 to be closed, the second battery system B can drive the second electric drive system 102 independently; as another example, by controlling the seventh control switch K1 and the eighth control switch K2 to be closed and controlling the ninth control switch K5 and the tenth control switch K6 to be open, the second battery system B can drive the first electric drive system 101 independently.

[0098] In step S7022, the second switch group, the first control switch, and the second control switch are controlled to open, and the first switch group and the third switch group are controlled to close, so as to supply power to the first electric drive system using the first battery system and to supply power to the second electric drive system using the second battery system.

[0099] Specifically, see again Figure 1 When the first battery system A needs to drive the first electric drive system 101 and the second battery system B needs to drive the second electric drive system 102, the seventh control switch K1 and the eighth control switch K2 are opened, the fifth control switch K3, the sixth control switch K4, the ninth control switch K5 and the tenth control switch K6 are closed, and the first control switch S3-1 and the second control switch S3-2 in the power module 103 are opened, so that the first electric drive system 101 and the second electric drive system 102 can work alone or together according to the power demand.

[0100] In step S7023, the fifth control switch is opened, and the sixth control switch, the second switch group, and the third switch group are closed. The first control switch and the second control switch are used to control the first battery system and the second battery system to supply power to the second electric drive system.

[0101] Specifically, see again Figure 1 In driving mode, to maximize range, only the second electric drive system 102 can be powered. The first battery system A and the second battery system B simultaneously supply power to the second electric drive system 102, with the second battery system B being the primary power supply unit and the first battery system A serving as the auxiliary power supply unit. At this time, the fifth control switch K3 is opened, and the sixth control switch K4, the seventh control switch K1, the eighth control switch K2, the ninth control switch K5, and the tenth control switch K6 are closed.

[0102] In this embodiment, by switching the switching states of each control switch in the hybrid battery system, the second battery system can be controlled to supply power to the first and second electric drive systems independently, the first battery system can supply power to the first electric drive system independently, the second battery system can supply power to the second electric drive system independently, or the first and second battery systems can supply power to the second electric drive system simultaneously. This achieves multiple power supply modes, thereby utilizing the respective advantages of the first and second battery systems to meet the various driving needs of the vehicle's electric drive system.

[0103] In this embodiment, during the power supply process of steps S7021 to S7023, it is determined in real time whether the first power level and the second power level are below the power threshold. If the first power level or the second power level is detected to be below the power threshold, the charging process of step S703 is executed.

[0104] Step S703: When the first battery level or the second battery level is detected to be lower than the battery level threshold, the first battery system and the second battery system are charged.

[0105] Specifically, step S703 includes:

[0106] Step S7031: When the first battery level is detected to be lower than the battery threshold, the first battery system is charged using an external power supply module.

[0107] Specifically, if the first battery system A's charge level is lower than the charge threshold, the vehicle enters a charging state, using an external power supply module to charge the first battery system A, and simultaneously using the first battery system A to charge the second battery system B. At this time, the fifth control switch K3 is opened, and the sixth control switch K4, the seventh control switch K1, the eighth control switch K2, the ninth control switch K5, and the tenth control switch K6 are closed.

[0108] It should be noted that the power supply voltage of the external power supply module should match the first voltage of the first battery system A. When charging the second battery system B using the first battery system A, the switch state can be switched based on the relationship between the power supply voltage (i.e., the first voltage) and the second voltage of the external power supply module to charge the second battery system B. For details, please refer to the detailed description of step S7032 below, which will not be repeated here.

[0109] Step S7032: When the second battery level is detected to be lower than the battery level threshold, based on the relationship between the first voltage and the second voltage, the switching states of the power module, the first switch group, the second switch group and the third switch group are switched, and the second battery system is charged using the first battery system and the first electric drive system.

[0110] In some optional implementations, step S7032 above includes:

[0111] Step a1: Control the fifth control switch and the third switch group to open, control the sixth control switch and the second switch group to close, and determine whether the first voltage is lower than the second voltage.

[0112] Specifically, if the battery level of the second battery system B is detected to be low while the vehicle is parked, driving, or charging, the fifth control switch K3, the ninth control switch K5, and the tenth control switch K6 are opened, and the seventh control switch K1, the eighth control switch K2, and the sixth control switch K4 are closed. It is then determined whether the first voltage is lower than the second voltage. If the first voltage is lower than the second voltage, step a2 is executed; otherwise, step a3 is executed.

[0113] In step a2, if the first voltage is lower than the second voltage, the first control switch and the fourth control switch are closed to charge the energy storage element using the first battery system.

[0114] Specifically, see again Figure 1 The voltage of the first battery system A is lower than that of the second battery system B, so the first battery system A needs to charge the second battery system B. Based on the control in step a1, the first control switch S3-1 and the fourth control switches S1-4, S1-5, and S1-6 are further controlled to close, while the others are open. At this time, the current flows to the positive terminal of the first battery system A, the first control switch S3-1, the energy storage element L1, the fourth control switch, the sixth control switch K4, and the negative terminal of the first battery system A, so that the first battery system A can charge the energy storage element L1.

[0115] Step a3: If the first voltage is not lower than the second voltage, control the first control switch and the third control switch to close, and use the first battery system to charge the energy storage element and the second battery system.

[0116] Specifically, see again Figure 1 The voltage of the first battery system A is not lower than that of the second battery system B, so the first battery system A needs to charge the second battery system B. Based on the control in step a1, the first control switch S3-1 and the third control switches S1-1, S1-2, and S1-3 are further controlled to close, while the others are open. At this time, the current flows from the positive terminal of the first battery system A, through the first control switch S3-1, the energy storage element L1, the third control switch, the second battery system B, to the negative terminal of the first battery system A, so that the first battery system A can charge the energy storage element L1 and the second battery system B.

[0117] Step a4: When the third voltage of the energy storage element is detected to match the first voltage, the second control switch and the third control switch are closed to charge the second battery system using the energy storage element.

[0118] Specifically, if the third voltage of the energy storage element L1 matches the first voltage of the first battery system A, based on the control in step a1, the second control switch S3-2 and the third control switches S1-1, S1-2, and S1-3 are closed, while the others are open. At this time, the current starts from one end of the energy storage element L1, passes through the third control switch, the second battery system B, and the second control switch S3-2 in sequence, and returns to the other end of the energy storage element L1, thereby using the energy storage element L1 to charge the second battery system B.

[0119] In this embodiment, when the power of the second battery system is low, the first battery system is first controlled to charge the energy storage element, and then the energy storage element is used to charge the second battery system, thereby realizing the charging process of the second battery system. Moreover, the voltage balance between the first battery system and the second battery system can be achieved without the need for DC-DC converter.

[0120] The control method for the hybrid battery system provided in this embodiment can achieve battery charging by switching the switching states of various control switches in the hybrid battery system when the first or second battery system has low power. This eliminates the need for DC-DC converters for control, resulting in lower costs and higher battery pack space utilization.

[0121] This embodiment provides a control method for a hybrid battery system, which can be used as follows: Figure 1 The hybrid battery system shown, Figure 8 This is a flowchart of a control method for a hybrid battery system according to an embodiment of the present invention, such as... Figure 8 As shown, the process includes the following steps:

[0122] Step S801 involves monitoring the first charge level of the first battery system and the second charge level of the second battery system, as well as determining the current vehicle status, the first temperature of the first battery system, and the second temperature of the second battery system. For details, please refer to [reference needed]. Figure 7 The detailed description of step S701 in the illustrated embodiment will not be repeated here.

[0123] Step S802 involves switching the switching states of the power module, the first switch group, the second switch group, and the third switch group to control at least one of the first battery system and the second battery system, thereby supplying power to at least one of the first electric drive system and the second electric drive system. For details, please refer to... Figure 7 The detailed description of step S702 in the illustrated embodiment will not be repeated here.

[0124] Step S803: When the first or second battery level is detected to be below a battery threshold, the first and second battery systems are charged. For details, please refer to [reference needed]. Figure 7 The detailed description of step S703 in the illustrated embodiment will not be repeated here.

[0125] Step S804: When the first temperature or the second temperature is detected to be lower than the temperature threshold, based on the current vehicle state, the switching states of the power module, the first switch group, the second switch group and the third switch group are switched to heat the first battery system and the second battery system.

[0126] In some optional implementations, step S804 above includes:

[0127] Step b1: If the current vehicle status is detected as parked, the third switch group is opened and the first and second switch groups are closed. The power module and the first electric drive system are controlled to perform pulse oscillation to heat the first and second battery systems.

[0128] Specifically, when the vehicle is parked, if the first or second temperature is lower than the temperature threshold, the ninth control switch K5 and the tenth control switch K6 will be opened, and the seventh control switch K1, the eighth control switch K2, the fifth control switch K3, and the sixth control switch K4 will be closed. The temperature threshold can be set according to the actual scenario.

[0129] Furthermore, the control power module and the first electric drive system perform pulse oscillation, and the specific steps are as follows:

[0130] In step c1, the first control switch S3-1 and the fourth control switches S1-4, S1-5, and S1-6 are connected, while the others are disconnected. At this time, there are two current loops: one is the positive terminal of the first battery system A, the first control switch S3-1, the energy storage element L1, the fourth control switch, the sixth control switch K4, and the negative terminal of the first battery system A; the other is the positive terminal of the first battery system A, the first capacitor C1, and the negative terminal of the first battery system A, using the first battery system A to charge the energy storage element L1.

[0131] In step c2, the second control switch S3-2 and three of the third control switches S1-1, S1-2, and S1-3 are turned on, while the others are turned off. At this time, current flows simultaneously from both ends of the first capacitor C1. One end of the current passes through the positive terminal and the negative terminal of the second battery system B, and then merges with the other end of the current. After passing through the second control switch S3-2, the energy storage element L1, and the third control switch in sequence, the current returns to the positive terminal of the second battery system B, thereby using the energy storage element L1 to perform pulse charging on the second battery system B.

[0132] In step c3, continue to connect the second control switch S3-2 and the third control switches S1-1, S1-2, and S1-3, while disconnecting the others. At this time, the current direction is opposite to that in step c2, and the second battery system B charges the energy storage element L1.

[0133] In step c4, the first control switch S3-1 and the fourth control switches S1-4, S1-5, and S1-6 are turned on, while the others are turned off. At this time, the current direction is opposite to that in step c1, and the energy storage element L1 charges the first battery system A.

[0134] In this embodiment, pulse oscillation is achieved by repeatedly and alternately executing steps c1 to c4, thereby heating the first battery system A and the second battery system B at low temperature while the vehicle is parked.

[0135] Step b2: If the current vehicle status is detected as driving, control the first switch group, the second switch group and the third switch group to close, control the power module and the first electric drive system to perform pulse oscillation, and heat the first battery system and the second battery system.

[0136] Specifically, when the vehicle is in motion, if the first or second temperature is lower than the temperature threshold, the seventh control switch K1, the eighth control switch K2, the fifth control switch K3, the sixth control switch K4, the ninth control switch K5, and the tenth control switch K6 are closed. At this time, the first electric drive system and the power module participate in pulse oscillation heating, while the second electric drive system is mainly used to drive the vehicle. The specific steps are as follows:

[0137] In step d1, the first control switch S3-1 and the fourth control switches S1-4, S1-5, and S1-6 are turned on, while the others are turned off. At this time, the current direction is the same as in step c1, and the first battery system A charges the energy storage element L1.

[0138] In step d2, the second control switch S3-2 and the third control switches S1-1, S1-2, and S1-3 are turned on, while the others are turned off. At this time, the current direction is the same as in step c2, and the energy storage element L1 pulse-charges the second battery system B.

[0139] In step d3, continue to connect the second control switch S3-2 and the third control switches S1-1, S1-2, and S1-3, while disconnecting the others. At this time, the current direction is the same as in step c3, and the second battery system B charges the energy storage element L1.

[0140] In step d4, the first control switch S3-1 and the fourth control switches S1-4, S1-5, and S1-6 are turned on, while the others are turned off. At this time, the current direction is the same as in step c4, and the energy storage element L1 charges the first battery system A.

[0141] In this embodiment, pulse oscillation is achieved by repeatedly and alternately executing steps d1 to d4, thereby heating the first battery system A and the second battery system B at low temperature while the vehicle is in motion.

[0142] In this embodiment, when the vehicle is parked, the connection between the second battery system and the second electric drive system is disconnected, and the power module and the first electric drive system are controlled to perform pulse oscillation heating, thereby improving heating efficiency. When the vehicle is in motion, the connection between the second battery system and the second electric drive system is maintained, and the second electric drive system is used to ensure the normal driving of the vehicle while pulse oscillation heating is being performed.

[0143] The control method for the hybrid battery system provided in this embodiment, when the temperature of the first battery system and the second battery system is low, switches the switching states of the first switch group, the second switch group and the third switch group in combination with the current vehicle state, and selects a pulse oscillation heating method that matches the current vehicle state to heat the first battery system and the second battery system, thereby maintaining the normal operation of the battery system.

[0144] The following two specific application examples illustrate the control scheme of the hybrid battery system of the present invention.

[0145] See you again Figure 1 The working conditions involved in Application Example 1 mainly include:

[0146] Operating Condition 9.1: When the vehicle is parked, if the charge of the second battery system B is low and the first voltage of the first battery system A is lower than the second voltage of the second battery system B, the first battery system A needs to charge the second battery system B.

[0147] First, K3, K5, and K6 are disconnected, while K1, K2, and K4 are closed.

[0148] Next, S3-1, S1-4, S1-5, and S1-6 are turned on, while the rest are turned off, to charge the energy storage element L1.

[0149] Then, S3-2, S1-1, S1-2, and S1-3 are connected, while the rest are disconnected, to charge the second battery system B.

[0150] Operating condition 9.2: When the vehicle is parked, if the charge of the second battery system B is low, and the first voltage of the first battery system A is not lower than the second voltage of the second battery system B, the first battery system A needs to charge the second battery system B.

[0151] First, K3, K5, and K6 are disconnected, while K1, K2, and K4 are closed.

[0152] Next, S3-1, S1-1, S1-2, and S1-3 are turned on, while the rest are turned off, to charge the energy storage element L1 and the second battery system B.

[0153] Then, S3-2, S1-1, S1-2, and S1-3 are turned on, while the rest are turned off, and the energy storage element L1 charges the second battery system B.

[0154] Operating condition 9.3: Low-temperature vibration heating is achieved when the vehicle is parked.

[0155] First, K5 and K6 are disconnected, while K1, K2, K3, and K4 are closed.

[0156] Next, S3-1, S1-4, S1-5, and S1-6 are turned on, while the rest are turned off, and the first battery system A charges the energy storage element L1.

[0157] Next, S3-2, S1-1, S1-2, and S1-3 are turned on, while the rest are turned off, and the energy storage element L1 provides pulse charging to the second battery system B.

[0158] Then, S3-2, S1-1, S1-2, and S1-3 are connected, while the rest are disconnected, and the second battery system B charges the energy storage element L1.

[0159] Finally, S3-1, S1-4, S1-5, and S1-6 are turned on, while the rest are turned off, and the energy storage element L1 charges the first battery system A. Through the above repeated alternating operations, oscillation heating is achieved.

[0160] Operating condition 9.4: In driving mode, the second battery system B independently drives the first electric drive system and the second electric drive system.

[0161] At this time, K3 and K4 are disconnected, and K1, K2, K5, and K6 enable the first electric drive system and the second electric drive system to work individually or together as needed.

[0162] When the second battery system B has a low charge, if the vehicle is still in a parked state, the system will switch to operating condition 1 or operating condition 2 to enable the first battery system A to charge the second battery system B.

[0163] When the second battery system B has a low charge, if the vehicle still needs to continue driving, it will switch to subsequent operating condition 6 to enable the first battery system A to discharge to the outside while ensuring normal driving.

[0164] Operating condition 9.5: Under driving conditions, the first battery system A enables the first electric drive system to operate, and the second battery system B enables the second electric drive system to operate.

[0165] At this time, K1 and K2 are disconnected, K3, K4, K5 and K6 are closed, and S3-1 and S3-2 in the power module are disconnected, so that the first electric drive system and the second electric drive system can work alone or together according to the power demand.

[0166] Under operating condition 9.6, in driving mode, to maximize range, only the second electric drive system can be used for propulsion, with both the first battery system A and the second battery system B simultaneously supplying power to the second electric drive system. The second battery system B is the primary power supply unit, and the first battery system A is the auxiliary power supply unit.

[0167] At this point, K3 is open, and K1, K2, K4, K5, and K6 are closed.

[0168] When the voltage of the first battery system A is not lower than that of the second battery system B, the power module can be closed according to operating condition 1 to complete the charging of the second battery system B; or, when the voltage of the first battery system A is not lower than that of the second battery system B, the first battery system A does not supply power at first, and the first battery system A supplies power again when the discharge of the second battery system B is lower than that of the first battery system A.

[0169] When the voltage of the first battery system A is lower than that of the second battery system B, the power module can be closed according to operating condition 2 to complete the charging of the second battery system B.

[0170] Operating condition 9.7: Under driving conditions, low-temperature vibration heating is achieved.

[0171] First, K1, K2, K3, K4, K5, and K6 are closed, the first electric drive system and power module participate in the oscillation heating, and the second electric drive system drives the vehicle.

[0172] Next, S3-1, S1-4, S1-5, and S1-6 are turned on, while the rest are turned off, and the first battery system A charges the energy storage element L1.

[0173] Next, S3-2, S1-1, S1-2, and S1-3 are turned on, while the rest are turned off, and the energy storage element L1 provides pulse charging to the second battery system B.

[0174] Then, S3-2, S1-1, S1-2, and S1-3 are connected, while the rest are disconnected, and the second battery system B charges the energy storage element L1.

[0175] Finally, S3-1, S1-4, S1-5, and S1-6 are turned on, while the rest are turned off, and the energy storage element L1 charges the first battery system A. Through the above repeated alternating operations, oscillation heating is achieved.

[0176] Operating condition 9.8: During the charging state, the external power supply module charges the first battery system A and the second battery system B, and the power supply voltage of the external power supply module matches the voltage of the first battery system A.

[0177] At this time, as Figure 9 As shown, K3 is open, and K1, K2, K4, K5, and K6 are closed.

[0178] When the supply voltage of the external power supply module is lower than that of the second battery system B, the power module can be closed according to operating condition 1 to complete the charging of the second battery system B.

[0179] When the power supply voltage of the external power supply module is not lower than that of the second battery system B, the power module can be closed according to operating condition 2 to complete the charging of the second battery system B.

[0180] like Figure 10 As shown, in Figure 1Based on this, an eleventh control switch K7 is added, wherein one end of K7 is connected between S3-1 and S3-2, and the other end of K7 is connected to the second inductor L2.

[0181] See you again Figure 10 The working conditions involved in Application Example 2 mainly include:

[0182] Operating condition 10.1: When the vehicle is in motion, the main working unit, the second battery system B, independently drives the first electric drive system and the second electric drive system.

[0183] At this time, K3, K4, and K7 are disconnected, and K1, K2, K5, and K6 enable the first electric drive system and the second electric drive system to work individually or together as needed.

[0184] Operating condition 10.2: When the vehicle is in motion, the first battery system A enables the first electric drive system to operate, and the second battery system B enables the second electric drive system to operate.

[0185] At this time, K1, K2, and K7 are disconnected, while K3, K4, K5, and K6 are closed. S3-1 and S3-2 in the power module are disconnected, allowing the first and second electric drive systems to work independently or together as needed.

[0186] Operating Condition 10.3: In parked mode, when the second battery system B has a low charge, the first battery system A needs to be charged. If the voltage of the first battery system A is lower than the voltage of the second battery system B:

[0187] First, K3 is open, and K1, K2, K4, K5, K6, and K7 are closed.

[0188] Next, S3-1, S1-4, S1-5, S1-6, S2-4, S2-5, and S2-6 are connected, while the rest are disconnected, charging L1 corresponding to the first electric drive system and the second inductor L2 in the second electric drive system.

[0189] Then, S3-1, S1-1, S1-2, S1-3, S2-1, S2-2, and S2-3 are connected, while the rest are disconnected, to charge the second battery system B.

[0190] Operating Condition 10.4: In the parked state, when the second battery system B has a low charge, the first battery system A needs to be charged. If the voltage of the first battery system A is not lower than the voltage of the second battery system B:

[0191] First, K3 is open, and K1, K2, K4, K5, K6, and K7 are closed.

[0192] Next, S3-1, S1-1, S1-2, and S1-3 are turned on, while the rest are turned off, to charge L1, L2, and the second battery system B.

[0193] Then, S3-2, S1-1, S1-2, and S1-3 are turned on, while the rest are turned off, and L1 and L2 charge the second battery system B.

[0194] Operating condition 10.5: Under driving conditions, low-temperature vibration heating is achieved.

[0195] At this point, K7 is disconnected, and the remaining operations are as described in condition 9.7.

[0196] Operating Condition 10.6: Under driving conditions, in order to maximize range, only the second electric drive system can be used for propulsion, with the first battery system A and the second battery system B simultaneously supplying power to the second electric drive system. The second battery system B is the main power supply unit, and the first battery system A is the auxiliary power supply unit.

[0197] At this point, K7 is disconnected, and the remaining operations are as per condition 9.6.

[0198] Operating Condition 10.7: When the vehicle is parked, K7 is closed, and the first and second electric drive systems participate in the oscillation heating, doubling the heating power.

[0199] First, S3-1, S1-4, S1-5, S1-6, S2-4, S2-5, and S2-6 are connected, while the rest are disconnected, and the first battery system A charges L1 and L2.

[0200] Next, S3-2, S1-1, S1-2, S1-3, S2-1, S2-2, and S2-3 are turned on, while the rest are turned off, and L1 and L2 provide pulse charging to the second battery system B.

[0201] Then, S3-2, S1-1, S1-2, S1-3, S2-1, S2-2, and S2-3 are connected, while the rest are disconnected, and the second battery system B charges L1 and L2.

[0202] Finally, S3-1, S1-4, S1-5, S1-6, S2-4, S2-5, and S2-6 are connected, while the others are disconnected, and the inductor coil charges the first battery system A. Through the above repeated alternating operation, oscillating heating is achieved.

[0203] Operating condition 10.8: During charging, the external power supply module charges the first battery system A and the second battery system B. K7 is disconnected, and the rest of the operation is the same as in operating condition 9.8.

[0204] In some embodiments, such as Figure 11 As shown, a combination of a three-battery system and a dual-electric drive system can be used. Figure 1Based on the hybrid battery system shown, a third battery system C is added, which can control the operation of a single battery system, two battery systems operating simultaneously, or all three battery systems operating simultaneously, depending on various operating conditions. The power module can be integrated into the battery system or into the electric drive system.

[0205] In some embodiments, such as Figure 12 As shown, a combination of a dual-battery system and a triple-electric drive system can be used. The power module can be integrated into the battery system or into the electric drive system.

[0206] It should be noted that, in the above embodiment set, the control switch in the hybrid battery system can be an IGBT module.

[0207] This invention utilizes IGBT modules in conjunction with an electric drive system to replace DC-DC converters, achieving voltage balance between two battery systems. Due to their small size, IGBT modules can be easily integrated into the battery pack or integrated with IGBT modules within the electric drive system.

[0208] This invention addresses the drawbacks of AB batteries, which require DC-DC converters for voltage balancing, resulting in large size, heavy weight, and high cost. It achieves voltage balancing and various charging / discharging functions between AB batteries by using an IGBT module in conjunction with an electric drive system. Compared to DC-DC modules, IGBT modules are smaller and more flexible in installation. They can be installed inside the high-voltage compartment of the battery pack or integrated with IGBT modules within the electric drive system for further miniaturization. Furthermore, it enables several new functions, such as low-temperature vibration heating and charging / discharging between AB batteries.

[0209] This embodiment also provides a control device for a hybrid battery system, which is used to implement the above embodiments and preferred embodiments; details already described will not be repeated. As used below, the term "module" can refer to a combination of software and / or hardware that implements a predetermined function. Although the device described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0210] This embodiment provides a control device for a hybrid battery system. The hybrid battery system includes a first electric drive system, a second electric drive system, a power module, a first switch group, a second switch group, a third switch group, a first battery system, and a second battery system. The power module is connected in parallel to both ends of the first battery system. The two ends of the first electric drive system are connected in parallel to both ends of the power module via the first switch group. The two ends of the second battery system are connected in parallel to both ends of the first electric drive system via the second switch group. The two ends of the second electric drive system are connected in parallel to both ends of the second battery system via the third switch group. Figure 13 As shown, it includes:

[0211] The first processing module 1301 is used to monitor the first charge level of the first battery system and the second charge level of the second battery system;

[0212] The second processing module 1302 is used to control at least one of the first battery system and the second battery system by switching the switching states of the power module, the first switch group, the second switch group and the third switch group, so as to supply power to at least one of the first electric drive system and the second electric drive system.

[0213] The third processing module 1303 is used to charge the first battery system and the second battery system when the first battery level or the second battery level is detected to be lower than the battery level threshold.

[0214] In some alternative implementations, the hybrid battery system further includes an energy storage element, the power module includes a first control switch and a second control switch connected in series, the first electric drive system includes a third control switch and a fourth control switch connected in series, and the first switch group includes a fifth control switch and a sixth control switch.

[0215] The fifth control switch is connected between the first control switch and the third control switch, and the sixth control switch is connected between the second control switch and the fourth control switch;

[0216] One end of the energy storage element is connected between the first control switch and the second control switch, and the other end of the energy storage element is connected between the third control switch and the fourth control switch.

[0217] In some optional implementations, the second processing module 1302 is further configured to:

[0218] The first switch group is opened, and the second and third switch groups are closed, so that the second battery system can supply power to the first and second electric drive systems.

[0219] Alternatively, the second switch group, the first control switch, and the second control switch can be opened, and the first switch group and the third switch group can be closed, so as to power the first electric drive system using the first battery system and to power the second electric drive system using the second battery system.

[0220] Alternatively, the fifth control switch can be opened, and the sixth control switch, the second switch group, and the third switch group can be closed. The first control switch and the second control switch can be used to control the first battery system and the second battery system to supply power to the second electric drive system.

[0221] In some optional implementations, the third processing module 1303 is further configured to:

[0222] Determine the first voltage of the first battery system and the second voltage of the second battery system;

[0223] When the first battery level is detected to be lower than the battery threshold, the first battery system is charged using an external power supply module;

[0224] When the second battery level is detected to be lower than the battery threshold, based on the relationship between the first voltage and the second voltage, the switching states of the power module, the first switch group, the second switch group, and the third switch group are switched, and the second battery system is charged using the first battery system and the first electric drive system.

[0225] In some optional implementations, the third processing module 1303 is further configured to:

[0226] The fifth control switch and the third switch group are opened, the sixth control switch and the second switch group are closed, and it is determined whether the first voltage is lower than the second voltage.

[0227] If the first voltage is lower than the second voltage, the first control switch and the fourth control switch are closed to charge the energy storage element using the first battery system.

[0228] If the first voltage is not lower than the second voltage, control the first control switch and the third control switch to close, and use the first battery system to charge the energy storage element and the second battery system;

[0229] When the third voltage of the energy storage element is detected to match the first voltage, the second control switch and the third control switch are closed to charge the second battery system using the energy storage element.

[0230] In some alternative implementations, the device is also used for:

[0231] Determine the current vehicle status, the first temperature of the first battery system, and the second temperature of the second battery system;

[0232] When the first temperature or the second temperature is detected to be lower than the temperature threshold, the switching states of the power module, the first switch group, the second switch group and the third switch group are switched based on the current vehicle status to heat the first battery system and the second battery system.

[0233] In some alternative embodiments, the hybrid battery system further includes a first capacitor, one end of which is connected between the fifth control switch and the third control switch, and the other end of which is connected between the sixth control switch and the fourth control switch; the device is also used for:

[0234] If the current vehicle status is detected as parked, the third switch group is opened, and the first and second switch groups are closed. The power module and the first electric drive system are controlled to perform pulse oscillation to heat the first and second battery systems.

[0235] If the current vehicle status is detected as driving, the first switch group, the second switch group, and the third switch group are closed to control the power module and the first electric drive system to perform pulse oscillation and heat the first battery system and the second battery system.

[0236] Further functional descriptions of the above modules and units are the same as those in the corresponding embodiments described above, and will not be repeated here.

[0237] In this embodiment, the control device of the hybrid battery system is presented in the form of a functional unit. Here, a unit refers to an ASIC (Application Specific Integrated Circuit) circuit, a processor and memory that execute one or more software or fixed programs, and / or other devices that can provide the above functions.

[0238] This invention also provides a vehicle having the above-described features. Figure 13 The control device for the hybrid battery system shown.

[0239] Please see Figure 14 , Figure 14 This is a schematic diagram of the structure of a vehicle provided in an optional embodiment of the present invention, such as... Figure 14 As shown, the vehicle includes one or more processors 10, memory 20, and interfaces for connecting the various components, including high-speed interfaces and low-speed interfaces. The various components communicate with each other via different buses and can be mounted on a common motherboard or otherwise installed as needed. The processors can process instructions executed within the vehicle, including instructions stored in or on memory to display graphical information of a GUI on external input / output devices (such as display devices coupled to the interfaces). In some alternative implementations, multiple processors and / or multiple buses can be used with multiple memories and multiple memory modules, if desired. Similarly, multiple devices can be connected, each providing some of the necessary operations (e.g., as a server array, a set of blade servers, or a multiprocessor system). Figure 14 Take a processor 10 as an example.

[0240] Processor 10 may be a central processing unit, a network processor, or a combination thereof. Processor 10 may further include a hardware chip. The hardware chip may be an application-specific integrated circuit (ASIC), a programmable logic device (PLD), or a combination thereof. The programmable logic device may be a complex programmable logic device (CAMP), a field-programmable gate array (FPGA), a general-purpose array logic (GDA), or any combination thereof.

[0241] The memory 20 stores instructions executable by at least one processor 10 to cause the at least one processor 10 to perform the method shown in the above embodiments.

[0242] The memory 20 may include a program storage area and a data storage area. The program storage area may store the operating system and applications required for at least one function; the data storage area may store data created based on vehicle usage. Furthermore, the memory 20 may include high-speed random access memory and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some alternative embodiments, the memory 20 may optionally include memory remotely located relative to the processor 10, which can be connected to the vehicle via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0243] The memory 20 may include volatile memory, such as random access memory; the memory may also include non-volatile memory, such as flash memory, hard disk or solid-state drive; the memory 20 may also include a combination of the above types of memory.

[0244] The vehicle also includes a communication interface 30 for communicating with other devices or communication networks.

[0245] This invention also provides a computer-readable storage medium. The methods described above according to embodiments of the invention can be implemented in hardware or firmware, or implemented as computer code that can be recorded on a storage medium, or implemented as computer code downloaded via a network and originally stored on a remote storage medium or a non-transitory machine-readable storage medium and then stored on a local storage medium. Thus, the methods described herein can be processed by software stored on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. The storage medium can be a magnetic disk, optical disk, read-only memory, random access memory, flash memory, hard disk, or solid-state drive, etc.; further, the storage medium can also include combinations of the above types of memory. It is understood that computers, processors, microprocessor controllers, or programmable hardware include storage components capable of storing or receiving software or computer code, which, when accessed and executed by the computer, processor, or hardware, implements the methods shown in the above embodiments.

[0246] A portion of this invention can be applied as a computer program product, such as computer program instructions, which, when executed by a computer, can invoke or provide the methods and / or technical solutions according to the invention through the operation of the computer. Those skilled in the art will understand that the forms in which computer program instructions exist in a computer-readable medium include, but are not limited to, source files, executable files, installation package files, etc. Correspondingly, the ways in which computer program instructions are executed by a computer include, but are not limited to: the computer directly executing the instructions, or the computer compiling the instructions and then executing the corresponding compiled program, or the computer reading and executing the instructions, or the computer reading and installing the instructions and then executing the corresponding installed program. Here, the computer-readable medium can be any available computer-readable storage medium or communication medium accessible to a computer.

[0247] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A control method for a hybrid battery system, characterized in that, The hybrid battery system includes a first electric drive system, a second electric drive system, a power module, a first switch group, a second switch group, a third switch group, a first battery system, and a second battery system. The power module is connected in parallel to both ends of the first battery system. The two ends of the first electric drive system are connected in parallel to both ends of the power module via the first switch group. The two ends of the second battery system are connected in parallel to both ends of the first electric drive system via the second switch group. The two ends of the second electric drive system are connected in parallel to both ends of the second battery system via the third switch group. The method includes: Monitor the first charge level of the first battery system and the second charge level of the second battery system; By switching the switching states of the power module, the first switch group, the second switch group, and the third switch group, at least one of the first battery system and the second battery system is controlled to supply power to at least one of the first electric drive system and the second electric drive system. When the first battery level or the second battery level is detected to be below the battery level threshold, the first battery system and the second battery system are charged.

2. The method according to claim 1, characterized in that, The hybrid battery system also includes an energy storage element, the power module includes a first control switch and a second control switch connected in series, the first electric drive system includes a third control switch and a fourth control switch connected in series, and the first switch group includes a fifth control switch and a sixth control switch. The fifth control switch is connected between the first control switch and the third control switch, and the sixth control switch is connected between the second control switch and the fourth control switch; One end of the energy storage element is connected between the first control switch and the second control switch, and the other end of the energy storage element is connected between the third control switch and the fourth control switch.

3. The method according to claim 2, characterized in that, The method of controlling at least one of the first battery system and the second battery system by switching the switching states of the power module, the first switch group, the second switch group, and the third switch group to supply power to at least one of the first electric drive system and the second electric drive system includes: The first switch group is opened, and the second and third switch groups are closed, so that the second battery system can supply power to the first electric drive system and the second electric drive system. Alternatively, the second switch group, the first control switch, and the second control switch can be opened, and the first switch group and the third switch group can be closed, so as to power the first electric drive system using the first battery system and to power the second electric drive system using the second battery system. Alternatively, the fifth control switch can be opened, and the sixth control switch, the second switch group, and the third switch group can be closed. The first control switch and the second control switch can be used to control the first battery system and the second battery system to supply power to the second electric drive system.

4. The method according to claim 2, characterized in that, The step of charging the first battery system and the second battery system when the first battery level or the second battery level is detected to be below a battery level threshold includes: Determine the first voltage of the first battery system and the second voltage of the second battery system; When the first battery level is detected to be lower than the battery threshold, the first battery system is charged using an external power supply module; When the second battery level is detected to be lower than the battery level threshold, the switching states of the power module, the first switch group, the second switch group, and the third switch group are switched based on the relationship between the first voltage and the second voltage, and the second battery system is charged using the first battery system and the first electric drive system.

5. The method according to claim 4, characterized in that, The method of switching the switching states of the power module, the first switch group, the second switch group, and the third switch group based on the magnitude relationship between the first voltage and the second voltage, and charging the second battery system using the first battery system and the first electric drive system, includes: The fifth control switch and the third switch group are opened, the sixth control switch and the second switch group are closed, and it is determined whether the first voltage is lower than the second voltage. If the first voltage is lower than the second voltage, then the first control switch and the fourth control switch are closed, and the first battery system is used to charge the energy storage element. If the first voltage is not lower than the second voltage, control the first control switch and the third control switch to close, and use the first battery system to charge the energy storage element and the second battery system; When the third voltage of the energy storage element is detected to match the first voltage, the second control switch and the third control switch are closed to charge the second battery system using the energy storage element.

6. The method according to claim 2, characterized in that, The method further includes: Determine the current vehicle status, the first temperature of the first battery system, and the second temperature of the second battery system; When the first temperature or the second temperature is detected to be lower than the temperature threshold, based on the current vehicle state, the switching states of the power module, the first switch group, the second switch group and the third switch group are switched to heat the first battery system and the second battery system.

7. The method according to claim 6, characterized in that, The hybrid battery system further includes a first capacitor, one end of which is connected between the fifth control switch and the third control switch, and the other end of which is connected between the sixth control switch and the fourth control switch; the step of switching the power module, the first switch group, the second switch group, and the third switch group based on the current vehicle state to heat the first battery system and the second battery system includes: If the current vehicle status is detected as parked, the third switch group is opened, and the first and second switch groups are closed. The power module and the first electric drive system are controlled to perform pulse oscillation to heat the first battery system and the second battery system. If the current vehicle status is detected as driving, the first switch group, the second switch group, and the third switch group are controlled to close, and the power module and the first electric drive system are controlled to perform pulse oscillation to heat the first battery system and the second battery system.

8. A control device for a hybrid battery system, characterized in that, The hybrid battery system includes a first electric drive system, a second electric drive system, a power module, a first switch group, a second switch group, a third switch group, a first battery system, and a second battery system. The power module is connected in parallel to both ends of the first battery system. The two ends of the first electric drive system are connected in parallel to both ends of the power module via the first switch group. The two ends of the second battery system are connected in parallel to both ends of the first electric drive system via the second switch group. The two ends of the second electric drive system are connected in parallel to both ends of the second battery system via the third switch group. The device includes: The first processing module is used to monitor the first charge level of the first battery system and the second charge level of the second battery system. The second processing module is used to control at least one of the first battery system and the second battery system to supply power to at least one of the first electric drive system and the second electric drive system by switching the switching states of the power module, the first switch group, the second switch group and the third switch group. The third processing module is used to charge the first battery system and the second battery system when the first battery level or the second battery level is detected to be below the battery level threshold.

9. A vehicle, characterized in that, include: A memory and a processor are communicatively connected, the memory stores computer instructions, and the processor executes the computer instructions to perform the control method of the hybrid battery system according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions for causing a computer to perform the control method of the hybrid battery system according to any one of claims 1 to 7.

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