Battery self-heating control system, control method and electric vehicle

Abstract

The embodiment of the application provides a battery self-heating control system, a control method and an electric vehicle. The control system comprises a battery pack, a winding, a first switch assembly, a second switch assembly, a capacitor and a controller. The battery pack comprises a first battery group and a second battery group connected in series, a connecting line is led out between the first battery group and the second battery group, and one end of the connecting line is connected with the winding. The first switch assembly and the second switch assembly are connected in series, the first switch assembly is electrically connected with the positive electrode of the first battery group and the first end of the capacitor respectively, the second switch assembly is electrically connected with the negative electrode of the second battery group and the second end of the capacitor respectively, the first end and the second end of the capacitor are used for connecting a load, and the midpoint of the first switch assembly and the second switch assembly is connected with the other end of the winding. The controller is electrically connected with the first switch assembly and the second switch assembly respectively.

Description

Technical Field

[0001] This application relates to the field of battery self-heating control system technology, specifically to a battery self-heating control system, control method, and electric vehicle. Background Technology

[0002] With the development of technology, electric vehicles are gradually becoming the main mode of transportation for people's daily travel; for example, electric cars have gradually become mainstream. Typically, electric vehicles are equipped with battery packs that power the loads within the vehicle. However, battery packs are affected by temperature. At low temperatures, the electrical performance of the battery pack deteriorates, severely impacting its discharge performance and leading to problems such as reduced driving range and limited output power.

[0003] In related technologies, the battery pack is heated externally, i.e., a battery heater is used to heat the battery. When the battery pack temperature is detected to be too low, an internal switch of the battery heater is turned on, causing the resistor in the battery heater to be energized and generate heat. The heat generated flows to the battery pack through an air duct or water duct to heat the battery pack.

[0004] Because the air ducts or water ducts are long, heat loss is significant, resulting in a slow and prolonged heating time for the battery pack, which affects the heating effect. Summary of the Invention

[0005] This application provides a battery self-heating control system to solve the problems in related technologies where long air ducts or water channels result in significant heat loss, leading to slow and prolonged heating of the battery pack. Additionally, heating the battery pack through air ducts or water channels causes uneven temperature distribution, affecting the heating effect.

[0006] To solve the above-mentioned technical problems, this application is implemented as follows:

[0007] This application provides a battery self-heating control system, which includes: a battery pack, windings, a first switching assembly, a second switching assembly, a capacitor, and a controller;

[0008] The battery pack includes a first battery pack and a second battery pack connected in series, with a connecting wire extending between the first battery pack and the second battery pack, and the connecting wire being connected to one end of the winding.

[0009] The first switch assembly and the second switch assembly are connected in series. The first switch assembly is electrically connected to the positive terminal of the first battery pack and the first terminal of the capacitor, respectively. The second switch assembly is electrically connected to the negative terminal of the second battery pack and the second terminal of the capacitor, respectively. The first and second terminals of the capacitor are used to connect the load. The other end of the winding is connected between the first switch assembly and the second switch assembly.

[0010] The controller is electrically connected to the first switch assembly and the second switch assembly respectively. The controller is used to control the first switch assembly and the second switch assembly to switch between a conducting state and a disconnecting state, so that the first battery pack and the second battery pack alternately charge and discharge through the winding, thereby heating the battery pack. At least one of the first battery pack, the second battery pack and the capacitor is used to supply power to the load.

[0011] Optionally, when the control system is in the first state, the controller controls the first switching component and the second switching component to switch between an on state and an off state during the first half cycle of each control cycle. The first battery pack charges the winding and charges the second battery pack through the winding. The capacitor and / or the first battery pack are used to supply power to the load.

[0012] During the second half-cycle of each control cycle of the controller, the controller controls the first switching component and the second switching component to switch between an on state and an off state, the second battery pack charges the winding and charges the first battery pack through the winding, and the capacitor and / or the second battery pack is used to supply power to the load.

[0013] Optionally, during the first time period of the first half-cycle, the controller controls the first switching component to be in a closed state and the second switching component to be in an open state, the first battery pack to charge the winding, and the capacitor to supply power to the load.

[0014] During the second time period of the first half-cycle, the controller controls the first switching component to be in the open state and the second switching component to be in the closed state. The winding charges the second battery pack, and the first battery pack and the capacitor supply power to the load.

[0015] Optionally, during the third time period of the second half-cycle, the controller controls the first switching component to be in the open state and the second switching component to be in the closed state, the second battery pack charges the winding, and the capacitor supplies power to the load;

[0016] During the fourth time period of the second half-cycle, the controller controls the first switching component to be in a closed state and the second switching component to be in an open state. The winding charges the first battery pack, and the second battery pack and the capacitor supply power to the load.

[0017] Optionally, when the control system is in the second state, the charge of the first battery pack is greater than the charge of the second battery pack. During the first time period of each control cycle, the controller controls the first switch assembly and the second switch assembly to switch between the on and off states, controls the first switch assembly to be in the closed state and the second switch assembly to be in the off state, the first battery pack charges the winding, and the first battery pack, the second battery pack and the capacitor supply power to the load.

[0018] During the second time period of each control cycle, the controller controls the first switching component to be in the open state and the second switching component to be in the closed state. The winding charges the second battery pack, and the first battery pack and the second battery pack supply power to the capacitor and the load.

[0019] Optionally, when the control system is in the second state, the charge of the second battery pack is greater than the charge of the first battery pack. During the third time period of each control cycle, the controller controls the first switch assembly to be in the open state and controls the second switch assembly to be in the closed state. The second battery pack charges the winding, and the first battery pack, the second battery pack, and the capacitor supply power to the load.

[0020] During the fourth time period of each control cycle, the controller controls the first switching component to be in a closed state and the second switching component to be in an open state. The winding charges the first battery pack, and the first battery pack and the second battery pack supply power to the capacitor and the load.

[0021] Optionally, in the event of damage to the second battery pack, the controller controls the first and second switching components to alternately be in the on state, so that the winding, the first switching component, the second switching component, and the capacitor form a boost circuit, through which the first battery pack supplies power to the load;

[0022] In the event of damage to the first battery pack, the controller controls the first and second switching components to alternately be in the on state, so that the winding, the first switching component, the second switching component, and the capacitor form a boost circuit, through which the second battery pack supplies power to the load.

[0023] Optionally, a switching device is provided on the connecting line, the switching device is electrically connected to the controller, and the controller is used to control the switching device to be in a conducting state or a disconnected state;

[0024] When the switching device is in the ON state, the battery pack supplies power to the load and is self-heating;

[0025] When the switching device is in the off state, the battery pack supplies power only to the load.

[0026] Secondly, embodiments of this application provide a control method, which includes:

[0027] Control the first switch assembly and the second switch assembly to switch between an on state and an off state;

[0028] The first battery pack and the second battery pack are alternately charged and discharged through the winding to heat the battery pack, and at least one of the first battery pack, the second battery pack and the capacitor charging is used to supply power to the load.

[0029] Optionally, when the control system is in the first state, controlling the first switching assembly and the second switching assembly to switch between an on state and an off state, so that there is alternating current between the first battery pack and the second battery pack, and the first battery pack and the second battery pack are alternately charged and discharged, including:

[0030] In the first half-cycle of each control cycle, the first switching assembly and the second switching assembly are controlled to switch between an on state and an off state, the first battery pack charges the winding and charges the second battery pack through the winding, and the capacitor or the first battery pack and the capacitor are used to supply power to the load.

[0031] During the second half of each control cycle, the first switching assembly and the second switching assembly are controlled to switch between an on state and an off state. The second battery pack charges the winding and charges the first battery pack through the winding. The capacitor or the second battery pack and the capacitor are used to supply power to the load.

[0032] Optionally, during the first half-cycle of each control cycle, the first switching assembly and the second switching assembly are controlled to switch between an on state and an off state, the first battery pack charges the winding and charges the second battery pack through the winding, and the capacitor, or the first battery pack and the capacitor, are used to supply power to the load, including:

[0033] During the first time period of the first half-cycle, the first switch assembly is controlled to be in the closed state, the second switch assembly is in the open state, the first battery pack charges the winding, and the capacitor supplies power to the load.

[0034] During the second time period of the first half-cycle, the first switching component is controlled to be in the open state, the second switching component is controlled to be in the closed state, the winding charges the second battery pack, and the first battery pack and the capacitor supply power to the load.

[0035] Optionally, during the second half-cycle of each control cycle, the first switching assembly and the second switching assembly are controlled to switch between an on state and an off state, the second battery pack charges the winding and charges the first battery pack through the winding, and the capacitor or the second battery pack and the capacitor are used to supply power to the load, including:

[0036] During the third time period of the second half-cycle, the first switching component is controlled to be in the open state, the second switching component is controlled to be in the closed state, the second battery pack charges the winding, and the capacitor supplies power to the load.

[0037] During the fourth time period of the second half-cycle, the first switching component is controlled to be in the closed state, the second switching component is controlled to be in the open state, the winding charges the first battery pack, and the second battery pack and the capacitor supply power to the load.

[0038] Optionally, when the control system is in the second state, controlling the first and second switching components to switch between an on and off state, so that there is alternating current between the first and second battery packs, and the first and second battery packs are alternately charged and discharged, including:

[0039] The first battery pack has a higher charge than the second battery pack. During the first time period of each control cycle, the first and second switching components are controlled to switch between an on and off state. The first switching component is controlled to be in a closed state and the second switching component is controlled to be in an off state. The first battery pack charges the winding. The first battery pack, the second battery pack, and the capacitor supply power to the load.

[0040] During the second time period of each control cycle, the first switching component is controlled to be in the open state, the second switching component is controlled to be in the closed state, the winding charges the second battery pack, and the first battery pack and the second battery pack supply power to the capacitor and the load.

[0041] Optionally, when the control system is in the second state, controlling the first and second switching components to switch between an on and off state to provide alternating current between the first and second battery packs, and the first and second battery packs being charged and discharged alternately, further includes:

[0042] When the control system is in the second state, the charge of the second battery pack is greater than that of the first battery pack. During the third time period of each control cycle, the first switch assembly is controlled to be in the open state, the second switch assembly is controlled to be in the closed state, the second battery pack charges the winding, and the first battery pack, the second battery pack, and the capacitor supply power to the load.

[0043] During the fourth time period of each control cycle, the first switching component is controlled to be in a closed state, the second switching component is controlled to be in an open state, the winding charges the first battery pack, and the first battery pack and the second battery pack supply power to the capacitor and the load.

[0044] Optionally, the method further includes: in the event of damage to the second battery pack, controlling the first switching assembly and the second switching assembly to alternately be in a conducting state, so that the winding, the first switching assembly, the second switching assembly, and the capacitor form a boost circuit, and the first battery pack supplies power to the load through the boost circuit;

[0045] In the event of damage to the first battery pack, the first and second switching components are controlled to alternately be in the on state, so that the winding, the first switching component, the second switching component, and the capacitor form a boost circuit, and the second battery pack supplies power to the load through the boost circuit.

[0046] Thirdly, embodiments of this application provide an electric vehicle that includes the battery self-heating control system described in any one of the first aspects above.

[0047] In this embodiment, since the connecting line between the first and second battery packs is connected to one end of the winding, and the first and second switching components are connected in series, with the first switching component electrically connected to the positive terminal of the first battery pack and the first terminal of the capacitor, and the second switching component electrically connected to the negative terminal of the second battery pack and the second terminal of the capacitor, and the first and second terminals of the capacitor used to connect the load, the first and second battery packs can charge and discharge each other by switching the on and off states of the first and second switching components. After the first battery pack charges the second battery pack, the second battery pack can charge the first battery pack, causing the current direction of the first battery pack to change periodically, and the current direction of the second battery pack to change periodically, which is equivalent to alternating current between the first and second battery packs. Since the controller is electrically connected to the first and second switching components, it can control the switching of the first and second switching components between the on and off states, which is equivalent to alternating current between the first and second battery packs. The alternating charging and discharging of the first and second battery packs causes the battery pack to heat up, i.e., the battery pack self-heats. In addition, when the first battery pack and the second battery pack are charged and discharged alternately, both the first battery pack and the second battery pack are electrically connected to the winding. The first battery pack and the second battery pack charge and discharge each other through the winding, and the first battery pack and the second battery pack charge the capacitor. Thus, the first battery pack and the second battery pack can supply power to the load, and the capacitor can also supply power to the load.

[0048] That is, in this embodiment of the application, the controller controls the first switch assembly and the second switch assembly to switch between the on state and the off state, so that there is an alternating current between the first battery pack and the second battery pack. The alternating current can generate an alternating oscillation effect between the first battery pack and the second battery pack, so that the battery pack can generate heat. This avoids the need to use external heating to heat the battery pack 10. Furthermore, heating from inside the battery pack can also make the temperature field distribution of the battery pack more uniform and improve the heating efficiency. Attached Figure Description

[0049] Figure 1 This is a schematic diagram illustrating one embodiment of a battery self-heating control system provided in this application;

[0050] Figure 2 This is a second schematic diagram illustrating a battery self-heating control system provided in an embodiment of this application;

[0051] Figure 3 This is a third schematic diagram illustrating a battery self-heating control system provided in an embodiment of this application;

[0052] Figure 4This is one of the schematic diagrams illustrating the current flow direction in a first state provided in an embodiment of this application;

[0053] Figure 5 This is a second schematic diagram illustrating the current flow direction in a first state provided in an embodiment of this application.

[0054] Figure 6 This is the third schematic diagram illustrating the current flow direction in a first state according to an embodiment of this application.

[0055] Figure 7 This is the fourth schematic diagram illustrating the current flow direction in a first state provided in an embodiment of this application.

[0056] Figure 8 This is one of the schematic diagrams illustrating the current flow direction in a second state provided in an embodiment of this application;

[0057] Figure 9 This is a second schematic diagram illustrating the current flow direction in a second state provided in an embodiment of this application.

[0058] Figure 10 This is the third schematic diagram illustrating the current flow direction in a second state provided in an embodiment of this application.

[0059] Figure 11 This is the fourth schematic diagram illustrating the current flow direction in a second state provided in an embodiment of this application.

[0060] Figure 12 This is one of the schematic diagrams illustrating the current flow direction in a third state provided in an embodiment of this application;

[0061] Figure 13 This is a second schematic diagram illustrating the current flow direction in a third state provided in an embodiment of this application.

[0062] Figure 14 This is the third schematic diagram illustrating the current flow direction in a third state provided in the embodiments of this application;

[0063] Figure 15 This is the fourth schematic diagram illustrating the current flow direction in a third state provided in an embodiment of this application.

[0064] Figure 16 This is one of the schematic diagrams illustrating the current flow direction when a second battery pack is damaged, according to an embodiment of this application.

[0065] Figure 17 This is a second schematic diagram illustrating the current flow direction when a second battery pack provided in this application is damaged;

[0066] Figure 18This is one of the schematic diagrams illustrating the current flow direction when a first battery pack is damaged, according to an embodiment of this application.

[0067] Figure 19 This is a second schematic diagram illustrating the current flow direction when a first battery pack is damaged, as provided in an embodiment of this application.

[0068] Figure 20 This is a flowchart illustrating a control method provided in an embodiment of this application.

[0069] Figure label:

[0070] 10: Battery pack; 20: Winding; 30: First switching assembly; 40: Second switching assembly; 50: Capacitor; 60: Switching device; 11: First battery pack; 12: Second battery pack; 100: Load; 101: Motor controller; 102: Other high-voltage loads. Detailed Implementation

[0071] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0072] It should be understood that the phrase "one embodiment" or "an embodiment" throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of this application. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments.

[0073] like Figure 1 As shown, the battery self-heating control system includes: a battery pack 10, a winding 20, a first switching assembly 30, a second switching assembly 40, a capacitor 50, and a controller (not shown in the figure).

[0074] The battery pack 10 includes a first battery group 11 and a second battery group 12 connected in series. A connecting wire extends between the first battery group 11 and the second battery group 12 and is connected to one end of the winding 20. A first switch assembly 30 and a second switch assembly 40 are connected in series. The first switch assembly 30 is electrically connected to the positive terminal of the first battery group 11 and the first terminal of the capacitor 50, respectively. The second switch assembly 40 is electrically connected to the negative terminal of the second battery group 12 and the second terminal of the capacitor 50, respectively. The first and second terminals of the capacitor 50 are used to connect to the load 100. The other end of the winding 20 is connected between the first switch assembly 30 and the second switch assembly 40. A controller is electrically connected to the first switch assembly 30 and the second switch assembly 40, respectively. The controller controls the first switch assembly 30 and the second switch assembly 40 to switch between an on state and an off state, so that the first battery group 11 and the second battery group 12 alternately charge and discharge through the winding 20, thereby heating the battery pack 50. At least one of the first battery group 11, the second battery group 12, and the capacitor 50 is used to supply power to the load.

[0075] In this embodiment, since the connecting line between the first battery pack 11 and the second battery pack 12 is connected to one end of the winding 20, the first switch assembly 30 and the second switch assembly 40 are connected in series, and the first switch assembly 30 is electrically connected to the positive terminal of the first battery pack 11 and the first terminal of the capacitor 50, respectively, and the second switch assembly 40 is electrically connected to the negative terminal of the second battery pack 12 and the second terminal of the capacitor 50, respectively, and the first and second terminals of the capacitor 50 are used to connect the load 100, the first battery pack 11 and the second battery pack 12 can charge and discharge each other by switching the on and off states of the first switch assembly 30 and the second switch assembly 40. After the first battery pack 11 charges the second battery pack 12, the second battery pack 12 can charge the first battery pack 11, so the current direction of the first battery pack 11 will change periodically, and the current direction of the second battery pack 12 will change periodically, which is equivalent to having alternating current between the first battery pack 11 and the second battery pack 12. Since the controller is electrically connected to the first switch assembly 30 and the second switch assembly 40 respectively, the controller can control the first switch assembly 30 and the second switch assembly 40 to switch between the on and off states. This is equivalent to having alternating current between the first battery pack 11 and the second battery pack 12, and the first battery pack 11 and the second battery pack 12 alternately charging and discharging, causing the battery pack 10 to heat up, i.e., the battery pack 10 self-heats. In addition, when the first battery pack 11 and the second battery pack 12 alternately charge and discharge, both the first battery pack 11 and the second battery pack 12 are electrically connected to the winding 20. The first battery pack 11 and the second battery pack 12 charge and discharge each other through the winding 20, and the first battery pack 11 and the second battery pack 12 charge the capacitor 50. Thus, the first battery pack 11 and the second battery pack 12 can supply power to the load 100, and the capacitor 50 can also supply power to the load 100.

[0076] That is, in this embodiment of the application, the controller controls the first switch assembly 30 and the second switch assembly 40 to switch between the on state and the off state, so that the first battery pack 11 and the second battery pack 12 are equivalent to having alternating current. The first battery pack 11 and the second battery pack 12 can generate an alternating oscillation effect due to the alternating current, so that the battery pack 10 can be heated, avoiding the use of external heating to heat the battery pack 10. Furthermore, heating from inside the battery pack 10 can also make the temperature field distribution of the battery pack 10 more uniform and improve the heating efficiency.

[0077] It should be noted that when the first battery pack 11 charges the second battery pack 12, the current direction of the first battery pack 11 is the first direction; when the second battery pack 12 charges the first battery pack 11, the current direction of the first battery pack 11 is the second direction. The first and second directions are opposite. The first battery pack 11 and the second battery pack 12 alternately charge and discharge, thus the current direction of the first battery pack 11 alternates, which is equivalent to the first battery pack 11 having alternating current, thereby enabling the first battery pack 11 to generate its own heat. The self-heating process of the second battery pack 12 is the same as that of the first battery pack 11, and will not be repeated here.

[0078] It should also be noted that, in this embodiment, the winding 20 can be an inductor. When the control system is applied to an electric vehicle, the electric vehicle has a motor, and the motor winding 20 can be used as the winding 20 in the control system, that is, the battery pack 10 is electrically connected to the motor winding 20. In addition, the winding 20 can also be other components with specific energy storage characteristics, or it can be a component that transmits alternating current to complete the transport and transfer of energy.

[0079] In addition, in the embodiments of this application, when the control system is applied to an electric vehicle, the controller can be the Body Control Module (BCM) in the electric vehicle. Of course, the controller can also be other controllers with control functions in the electric vehicle. In this regard, the embodiments of this application do not limit it.

[0080] Furthermore, in this embodiment, the first switching component 30 and the second switching component 40 can be insulated gate bipolar transistors (IGBTs) or metal-oxide-semiconductor field-effect transistors (MOSFETs). Of course, the first switching component 30 and the second switching component 40 can also be other types; for example, they can be other thyristors. Additionally, in this embodiment, when the control system is applied to an electric vehicle, such as... Figure 3 As shown, the bridge arm of the motor controller in the electric vehicle can also serve as the first switch assembly 30 and the second switch assembly 40, that is, the battery pack 10 is electrically connected to the bridge arm of the motor controller.

[0081] In addition, in this embodiment, capacitor 50 can be an external, independent capacitor 50. When the control system is applied to an electric vehicle, capacitor 50 can also be integrated with the motor controller 101 in the electric vehicle. Capacitor 50 can also be integrated with other high-voltage loads 102 in the electric vehicle. Of course, capacitor 50 can also be not integrated with the motor controller 101 or other high-voltage loads 102. This embodiment does not limit this aspect.

[0082] In addition, in the embodiments of this application, when the control system is applied to an electric vehicle, the load 100 can be a motor controller 101 and other high-voltage loads 102. Of course, the load 100 can also be only other high-voltage loads 102, or only the motor controller 101.

[0083] Furthermore, in this embodiment, the first switch component 30 and the second switch component 40 have different on / off states at the same time. Specifically, when the first switch component 30 is in the on state, the second switch component 40 is in the off state, and when the first switch component 30 is in the off state, the second switch component 40 is in the on state.

[0084] In addition, in this embodiment, both the first battery pack 11 and the second battery pack 12 can be independent battery packs 10. Alternatively, the first battery pack 11 and the second battery pack 12 can be two parts of the same battery pack 10, in which case the center line of the battery pack 10 is led out. Furthermore, the first battery pack 11 can also include multiple cells connected in series or parallel, and the second battery pack 12 can also include multiple cells connected in series or parallel. The number of cells in the first battery pack 11 and the number of cells in the second battery pack 12 can be equal, or they can be unequal; this embodiment does not limit this.

[0085] Additionally, in some embodiments, such as Figures 4 to 7 As shown, when the control system is in the first state, during the first half-cycle of each control cycle, the controller controls the first switching assembly 30 and the second switching assembly 40 to switch between an on and off state. The first battery pack 11 charges the winding 20 and, through the winding 20, charges the second battery pack 12. The capacitor 50 and / or the first battery pack 11 are used to supply power to the load 100. During the second half-cycle of each control cycle, the controller controls the first switching assembly 30 and the second switching assembly 40 to switch between an on and off state. The second battery pack 12 charges the winding 20 and, through the winding 20, charges the first battery pack 11. The capacitor 50 and / or the second battery pack 12 are used to supply power to the load 100.

[0086] When the control system is in the first state, the controller's control cycle has multiple cycles. Within each control cycle, in the first half-cycle, the controller controls the first switching component 30 and the second switching component 40 to switch between an on and off state. Specifically, when the first switching component 30 is on, the second switching component 40 is off, and when the first switching component 30 is off, the second switching component 40 is on. This results in a voltage difference between the first battery pack 11 and the second battery pack 12. The first battery pack 11 charges the winding 20, and through the winding 20, it charges the second battery pack 12. Additionally, when the first battery pack 11 charges the winding 20, its energy is also transferred to the capacitor 50, thus the capacitor 50 and / or the first battery pack 11 also charge the load. During the second half-cycle of each control cycle, the controller switches the first switching component 30 and the second switching component 40 between an on and off state. When the first switching component 30 is on, the second switching component 40 is off; when the first switching component 30 is off, the second switching component 40 is on. This results in a voltage difference between the first battery pack 11 and the second battery pack 12. The second battery pack 12 charges the winding 20 and, through the winding 20, charges the first battery pack 11. Additionally, while the second battery pack 12 is charging the winding 20, its energy is also transferred to the capacitor 50, thus the capacitor 50 and / or the second battery pack 12 also charge the load.

[0087] Specifically, the first half-cycle can have a first time period and a second time period, and the second half-cycle can have a third time period and a fourth time period. The first time period and the second time period form a complete first half-cycle, and the third time period and the fourth time period form a complete second half-cycle.

[0088] In the first half-cycle, during the first time period, the controller keeps the first switch assembly 30 in the closed state and the second switch assembly 40 in the open state. The first battery pack 11 charges the winding 20, and the capacitor 50 supplies power to the load. During the second time period of the first half-cycle, the controller keeps the first switch assembly 30 in the open state and the second switch assembly 40 in the closed state. The winding 20 charges the second battery pack 12, and the first battery pack 11 and the capacitor 50 supply power to the load.

[0089] like Figure 4 As shown, when the first switch assembly 30 is in the closed state and the second switch assembly 40 is in the open state during the first time period, the voltage of the first battery pack 11 is greater than the voltage of the second battery pack 12. The first battery pack 11 charges the winding 20, allowing the winding 20 to store electrical energy. The electrical energy stored in the capacitor 50 then supplies power to the load 100. Figure 5 As shown, during the second time period, the first switch assembly 30 is in the open state and the second switch assembly 40 is in the closed state. At this time, it is equivalent to the first battery pack 11 and the winding 20 being connected in series, so the first battery pack 11 and the winding 20 jointly supply power to the load 100, while the winding 20 charges the second battery pack 12. When the controller controls the first switch assembly 30 to cycle through the state during the first and second time periods, and the second switch assembly 40 to cycle through the state during the first and second time periods, the first switch assembly 30, the second switch assembly 40, the winding 20, and the capacitor 50 are equivalent to forming a boost circuit. Thus, the first battery pack 11 supplies power to the load 100 through the boost circuit, and the first battery pack 11 continuously discharges to the second battery pack 12, while the second battery pack 12 is continuously charged.

[0090] During the third time period of the second half-cycle, the controller keeps the first switching component in the open state and the second switching component in the closed state. The second battery pack charges the winding, and the capacitor supplies power to the load. During the fourth time period of the second half-cycle, the controller keeps the first switching component in the closed state and the second switching component in the open state. The winding charges the first battery pack, and the second battery pack and capacitor supply power to the load.

[0091] During the third time period, the controller controls the first switch assembly 30 to be in the open state and the second switch assembly 40 to be in the closed state. During the fourth time period, the controller controls the first switch assembly 30 to be in the closed state and the second switch assembly 40 to be in the open state. Figure 6As shown, when the first switch assembly 30 is in the open state and the second switch assembly 40 is in the closed state during the third time period, after continuous charging of the first battery pack 11, the voltage of the second battery pack 12 is greater than the voltage of the first battery pack 11. The second battery pack 12 charges the winding 20, and the winding 20 can store electrical energy. The electrical energy stored in the capacitor 50 supplies power to the load 100. Figure 7 As shown, during the fourth time period, the first switch assembly 30 is in the closed state and the second switch assembly 40 is in the open state. At this time, it is equivalent to the second battery pack 12 being connected in series with the winding 20, so the second battery pack 12 and the winding 20 jointly supply power to the load 100, while the winding 20 charges the first battery pack 11. When the controller controls the first switch assembly 30 to cycle through the state during the third and fourth time periods, and the second switch assembly 40 to cycle through the state during the third and fourth time periods, the first switch assembly 30, the second switch assembly 40, the winding 20, and the capacitor 50 are equivalent to forming a boost circuit. Thus, the second battery pack 12 supplies power to the load 100 through the boost circuit, and the second battery pack 12 continuously discharges to the first battery pack 11, while the first battery pack 11 is continuously charged.

[0092] When the controller controls the first switching assembly 30 and the second switching assembly 40 in multiple control cycles, it is equivalent to each control cycle cycling, meaning the states of the first switching assembly 30 and the second switching assembly 40 cycle within the control cycle. This causes the first battery pack 11 and the second battery pack 12 to charge and discharge alternately. Specifically, during the first and second time periods of the first half-cycle of each control cycle, the first battery pack 11 discharges to the second battery pack 12, and the second battery pack 12 is charged. During the third and fourth time periods of the second half-cycle, the second battery pack 12 discharges to the first battery pack 11, and the first battery pack 11 is charged. Furthermore, during the alternating charging and discharging process of the first battery pack 11 and the second battery pack 12, it is equivalent to there being alternating current between them, allowing the battery pack 10 to self-heat.

[0093] Furthermore, during the controller's control cycle, i.e. after the first, second, third, and fourth time periods, the control of the first switching component 30 and the second switching component 40 is repeated within the first, second, third, and fourth time periods. Specifically, within one control cycle, during the fourth time period of the previous control cycle, the second battery pack 12 charges the first battery pack 11, causing the voltage of the first battery pack 11 to be greater than the voltage of the second battery pack 12. After the cycle, during the first time period of the current control cycle, the first battery pack 11 charges the second battery pack 12, and then the cycle repeats.

[0094] For example, the first control cycle is adjacent to the second control cycle, and the second control cycle is the current control cycle, while the first control cycle is the control cycle preceding the second control cycle. During the fourth time period of the first control cycle, the second battery pack 12 charges the first battery pack 11, resulting in the voltage of the first battery pack 11 being greater than the voltage of the second battery pack 12. Then, during the first time period of the second control cycle, the first battery pack 11 will charge itself.

[0095] It should be noted that each control cycle can be short, for example, the duration of a control cycle is 1 millisecond. Furthermore, the first time period, the second time period, the third time period, and the fourth time period constitute a complete control cycle; that is, the first half-cycle is formed by the first and second time periods, the second half-cycle by the third and fourth time periods, and the first and second half-cycles together constitute a complete control cycle.

[0096] Furthermore, in this embodiment, when the control system is applied to an electric vehicle, the first state can be that the electric vehicle is in a self-heating state while driving, i.e., the first state is a self-heating state while driving. This is equivalent to the battery pack 10 self-heating while the electric vehicle is in motion, i.e., during driving.

[0097] Additionally, in some embodiments, such as Figures 8 to 11As shown, if the charge of the first battery pack 11 is different from that of the second battery pack 12, the control system is in the second state. When the control system is in the second state, the charge of the first battery pack 11 is greater than that of the second battery pack 12. In the first time period of each control cycle, the controller controls the first switch assembly 30 and the second switch assembly 40 to switch between the on and off states, controlling the first switch assembly 30 to be in the closed state and the second switch assembly 40 to be in the off state. The first battery pack 11 charges the winding 20, and the first battery pack 11, the second battery pack 12, and the capacitor 50 supply power to the load 100. In the second time period of each control cycle, the controller controls the first switch assembly 30 to be in the off state and the second switch assembly 40 to be in the closed state. The winding 20 charges the second battery pack 12, and the first battery pack 11 and the second battery pack 12 supply power to the capacitor 50 and the load 100. In addition, when the control system is in the second state, the charge of the second battery pack 12 is greater than that of the first battery pack 11. During the third time period of each control cycle, the controller controls the first switch assembly 30 to be in the open state and the second switch assembly 40 to be in the closed state. The second battery pack 12 charges the winding 20, and the first battery pack 11, the second battery pack 12 and the capacitor 50 supply power to the load 100. During the fourth time period, the controller controls the first switch assembly 30 to be in the closed state and the second switch assembly 40 to be in the open state. The winding 20 charges the first battery pack 11, and the first battery pack 11 and the second battery pack 12 supply power to the capacitor and the load 100.

[0098] When the control system is applied to electric vehicles, the second state can be an balancing state, that is, balancing the charge of the first battery pack 11 and the second battery pack 12. For example, if the charge of the first battery pack 11 and the second battery pack 12 is different during driving, the balancing function can be activated to bring the electric vehicle into a balanced state.

[0099] Additionally, if the capacity of the first battery pack 11 is greater than the capacity of the second battery pack 12, such as Figure 8 As shown, during the first time period, the controller controls the first switch assembly 30 to be in the closed state and the second switch assembly 40 to be in the open state. At this time, the first battery pack 11 is connected in series with the first switch assembly 30, and the winding 20 is charged through the first switch assembly 30. At the same time, the first battery pack 11 and the second battery pack 12 are connected in series, and the first battery pack 11 and the second battery pack 12 supply power to the load 100. The capacitor 50 also supplies power to the load 100. Figure 9As shown, during the second time period, the controller controls the first switch assembly 30 to be in the open state and the second switch assembly 40 to be in the closed state. At this time, the winding 20 forms a complete circuit with the second battery pack 12 through the second switch assembly 40, and the winding 20 charges the second battery pack 12. In addition, the first battery pack 11 and the second battery pack 12 are connected in series, and the first battery pack 11 and the second battery pack 12 supply power to the load 100 and charge the capacitor 50.

[0100] It should be noted that the first time period and the second time period can constitute a control cycle, and the first time period and the second time period alternate in a cycle, so that the first battery pack 11 continuously discharges to the second battery pack 12, and finally the first battery pack 11 and the second battery pack 12 are balanced in power, while the first battery pack 11 and the second battery pack 12 supply power to the load 100.

[0101] Additionally, if the capacity of the second battery pack 12 is greater than the capacity of the first battery pack 11, such as Figure 10 As shown, during the third time period, the controller controls the first switch assembly 30 to be in the open state and the second switch assembly 40 to be in the closed state. At this time, the second battery pack 12 is connected in series with the second switch assembly 40, and the winding 20 is charged through the second switch assembly 40. Simultaneously, the second battery pack 12 is connected in series with the first battery pack 11, and the second battery pack 12 and the first battery pack 11 supply power to the load 100. The capacitor 50 also supplies power to the load 100. Figure 11 As shown, during the fourth time period, the controller controls the first switch assembly 30 to be in the closed state and the second switch assembly 40 to be in the open state. At this time, the winding 20 forms a complete circuit with the first battery pack 11 through the first switch assembly 30, the winding 20 charges the first battery pack 11, and the first battery pack 11 and the second battery pack 12 are connected in series. The first battery pack 11 and the second battery pack 12 supply power to the load 100 and charge the capacitor 50.

[0102] It should be noted that the third time period and the fourth time period can form a control cycle, and the third time period and the fourth time period alternate in a cycle, so that the second battery pack 12 continuously discharges to the first battery pack 11, and finally the second battery pack 12 and the first battery pack 11 are balanced in terms of power, while the first battery pack 11 and the second battery pack 12 supply power to the load 100.

[0103] In this embodiment, if the charge of the first battery pack 11 is greater than the charge of the second battery pack 12, the controller alternately controls the first switch assembly 30 and the second switch assembly 40 in a first time period and a second time period, so that the first battery pack 11 continuously discharges to the second battery pack 12, thereby balancing the charge of the first battery pack 11 and the second battery pack 12. If the charge of the second battery pack 12 is greater than the charge of the first battery pack 11, the controller alternately controls the first switch assembly 30 and the second switch assembly 40 in a third time period and a fourth time period, so that the second battery pack 12 continuously discharges to the first battery pack 11, thereby balancing the charge of the second battery pack 12 and the first battery pack 11.

[0104] Additionally, in some embodiments, such as Figures 12 to 15 As shown, when the control system is in the third state, within each control cycle of the controller, in the first time period, the controller controls the first switch assembly 30 to be closed and the second switch assembly 40 to be open, and the first battery pack 11 charges the winding 20; in the second time period, the controller controls the first switch assembly 30 to be open and the second switch assembly 40 to be closed, and the winding 20 charges the second battery pack 12. In the third time period, the controller controls the first switch assembly 30 to be open and the second switch assembly 40 to be closed, and the second battery pack 12 charges the winding 20; in the fourth time period, the controller controls the first switch assembly 30 to be closed and the second switch assembly 40 to be open, and the winding 20 charges the first battery pack 11.

[0105] When the control system is applied to electric vehicles, the third state can be either the parking heating state or the state where the electric vehicle is stopped and the battery pack 10 is self-heating. For example, when the electric vehicle is parked on the side of the road and the battery pack 10 needs to self-heat, the parking heating function is activated, and the control system is in the third state.

[0106] Furthermore, when the control system is in the first state, the controller's control cycle has multiple cycles. Within each control cycle, the controller controls the first switch assembly 30 to be in the closed state and the second switch assembly 40 to be in the open state during a first time period. During a second time period, the controller controls the first switch assembly 30 to be in the open state and the second switch assembly 40 to be in the closed state. For example... Figure 12 As shown, when the first switch assembly 30 is in the closed state and the second switch assembly 40 is in the open state during the first time period, the voltage of the first battery pack 11 is greater than the voltage of the second battery pack 12. The first battery pack 11 charges the winding 20, allowing the winding 20 to store electrical energy. Figure 13As shown, during the second time period, the first switch assembly 30 is in the open state and the second switch assembly 40 is in the closed state. At this time, the winding 20 forms a complete circuit with the second battery pack 12 through the second switch assembly 40, and the winding 20 charges the second battery pack 12. When the controller controls the first switch assembly 30 to cycle through the state during the first and second time periods, and the second switch assembly 40 to cycle through the state during the first and second time periods, the first battery pack 11 continuously discharges to the second battery pack 12, and the second battery pack 12 is continuously charged.

[0107] During the third time period, the controller controls the first switch assembly 30 to be in the open state and the second switch assembly 40 to be in the closed state. During the fourth time period, the controller controls the first switch assembly 30 to be in the closed state and the second switch assembly 40 to be in the open state. Figure 14 As shown, when the first switch assembly 30 is in the open state and the second switch assembly 40 is in the closed state during the third time period, after continuous charging of the first battery pack 11, the voltage of the second battery pack 12 is greater than the voltage of the first battery pack 11. The second battery pack 12 charges the winding 20, and the winding 20 can store electrical energy. The electrical energy stored in the capacitor 50 supplies power to the load 100. Figure 15 As shown, during the fourth time period, the first switch assembly 30 is in the closed state and the second switch assembly 40 is in the open state. At this time, the winding 20 forms a complete circuit with the first battery pack 11 through the first switch assembly 30, and the winding 20 charges the first battery pack 11. When the controller controls the first switch assembly 30 to cycle through the state between the third and fourth time periods, and the second switch assembly 40 to cycle through the state between the third and fourth time periods, the second battery pack 12 continuously discharges to the first battery pack 11, and the first battery pack 11 is continuously charged.

[0108] When the controller controls the first switching assembly 30 and the second switching assembly 40 in multiple control cycles, it is equivalent to each control cycle being a loop, meaning the states of the first switching assembly 30 and the second switching assembly 40 cycle within the control cycle. This causes the first battery pack 11 and the second battery pack 12 to charge and discharge alternately. Specifically, during the first and second time periods of each control cycle, the first battery pack 11 discharges to the second battery pack 12, and the second battery pack 12 is charged. During the third and fourth time periods, the second battery pack 12 discharges to the first battery pack 11, and the first battery pack 11 is charged. Furthermore, during the alternating charging and discharging process of the first battery pack 11 and the second battery pack 12, it is equivalent to there being alternating current between them, allowing the battery pack 10 to self-heat.

[0109] Furthermore, during the controller's control cycle, i.e. after the first, second, third, and fourth time periods, the control of the first switching component 30 and the second switching component 40 is repeated within the first, second, third, and fourth time periods. Specifically, within one control cycle, during the fourth time period of the previous control cycle, the second battery pack 12 charges the first battery pack 11, causing the voltage of the first battery pack 11 to be greater than the voltage of the second battery pack 12. After the cycle, during the first time period of the current control cycle, the first battery pack 11 charges the second battery pack 12, and then the cycle repeats.

[0110] For example, the first control cycle is adjacent to the second control cycle, and the second control cycle is the current control cycle, while the first control cycle is the control cycle preceding the second control cycle. During the fourth time period of the first control cycle, the second battery pack 12 charges the first battery pack 11, resulting in the voltage of the first battery pack 11 being greater than the voltage of the second battery pack 12. Then, during the first time period of the second control cycle, the first battery pack 11 will charge itself.

[0111] Additionally, in some embodiments, such as Figures 16 to 19 As shown, in the event of a failure of the second battery pack 12, the controller controls the first switching assembly 30 and the second switching assembly 40 to alternately be in a conducting state, so that the winding 20, the first switching assembly 30, the second switching assembly 40, and the capacitor 50 form a boost circuit, and the first battery pack 11 supplies power to the load 100 through the boost circuit. Similarly, in the event of a failure of the first battery pack 11, the controller controls the first switching assembly 30 and the second switching assembly 40 to alternately be in a conducting state, so that the winding 20, the first switching assembly 30, the second switching assembly 40, and the capacitor 50 form a boost circuit, and the second battery pack 12 supplies power to the load 100 through the boost circuit.

[0112] When the second battery pack 12 fails, it cannot supply power to the load 100, leaving only the first battery pack 11 to supply power. The controller then controls the first switching assembly 30 and the second switching assembly 40 to alternately remain in the on state. Figure 16 As shown, during the first time period, the first switch assembly 30 is in the closed state, the second switch assembly 40 is in the open state, the first battery pack 11 charges the winding 20 through the first switch assembly 30, and at the same time, the energy stored in the capacitor 50 supplies power to the load 100. Figure 17As shown, during the second time period, the first switching component 30 is in the off state, and the second switching component 40 is in the on state. The first battery pack 11 is connected in series with the winding 20 to charge the capacitor 50 and simultaneously supply power to the load 100. That is, the first switching component 30 switches between the on and off states, and the second switching component 40 switches between the on and off states. When the first switching component 30 is on, the second switching component 40 is off, and when the first switching component 30 is off, the second switching component 40 is on. Thus, the winding 20, the first switching component 30, the second switching component 40, and the capacitor 50 can form a boost circuit, thereby increasing the voltage of the first battery pack 11 to meet the voltage required by the load 100, that is, supplying power to the load 100 through the first battery pack 11.

[0113] Similarly, when the first battery pack 11 fails, it cannot supply power to the load 100, leaving only the second battery pack 12 to supply power. The controller then controls the first switching assembly 30 and the second switching assembly 40 to alternately remain in the on state, such as... Figure 18 As shown, during the third time period, the first switch assembly 30 is in the off state, the second switch assembly 40 is in the on state, the second battery pack 12 charges the winding 20 through the second switch assembly 40, and at the same time, the energy stored in the capacitor 50 supplies power to the load 100. Figure 19 As shown, during the fourth time period, the first switching component 30 is in the on state, the second switching component 40 is in the off state, and the second battery pack 12 is connected in series with the winding 20 to charge the capacitor 50 and simultaneously supply power to the load 100. That is, the first switching component 30 switches between the on and off states, and the second switching component 40 switches between the on and off states. When the first switching component 30 is on, the second switching component 40 is off, and when the first switching component 30 is off, the second switching component 40 is on. Thus, the winding 20, the first switching component 30, the second switching component 40, and the capacitor 50 can form a boost circuit, thereby increasing the voltage of the second battery pack 12 to meet the voltage required by the load 100, that is, supplying power to the load 100 through the second battery pack 12.

[0114] Additionally, in some embodiments, such as Figure 2 or Figure 3 As shown, a switch device 60 is provided on the connecting line. The switch device 60 is electrically connected to the controller, which controls the switch device 60 to be in a conducting or disconnected state. When the switch device 60 is in the conducting state, the battery pack 10 supplies power to the load 100 and is self-heating; when the switch device 60 is in the disconnected state, the battery pack 10 only supplies power to the load 100.

[0115] When a switch 60 is installed on the connection line and the switch 60 is electrically connected to the controller, at this time, when only the battery pack 10 needs to supply power to the load 100, such as Figure 2 As shown, the controller controls the switch 60 to be in the off state, and the first battery pack 11 and the second battery pack 12 are connected in series to supply power to the load 100. When the battery pack 10 needs to self-heat and supply power to the load 100, the controller controls the switch 60 to be in the on state, and controls the first switch assembly 30 and the second switch assembly 40 to alternately switch between the on and off states. Thus, the battery pack 10 can not only self-heat but also supply power to the load 100. That is, by setting the switch 60 on the connection line, the functionality of the control system can be diversified.

[0116] It should be noted that the switching device 60 can be an insulated gate bipolar transistor (IGBT) or a metal-oxide-semiconductor field-effect transistor (MOSFET). The specific type of the switching device 60 is not limited in this embodiment.

[0117] In this embodiment, since the connecting line between the first battery pack 11 and the second battery pack 12 is connected to one end of the winding 20, the first switch assembly 30 and the second switch assembly 40 are connected in series, and the first switch assembly 30 is electrically connected to the positive terminal of the first battery pack 11 and the first terminal of the capacitor 50, respectively, and the second switch assembly 40 is electrically connected to the negative terminal of the second battery pack 12 and the second terminal of the capacitor 50, respectively, and the first and second terminals of the capacitor 50 are used to connect the load 100, the first battery pack 11 and the second battery pack 12 can charge and discharge each other by switching the on and off states of the first switch assembly 30 and the second switch assembly 40. After the first battery pack 11 charges the second battery pack 12, the second battery pack 12 can charge the first battery pack 11, so the current direction of the first battery pack 11 will change periodically, and the current direction of the second battery pack 12 will change periodically, which is equivalent to having alternating current between the first battery pack 11 and the second battery pack 12. Since the controller is electrically connected to the first switch assembly 30 and the second switch assembly 40 respectively, the controller can control the first switch assembly 30 and the second switch assembly 40 to switch between the on and off states. This is equivalent to having alternating current between the first battery pack 11 and the second battery pack 12, and the first battery pack 11 and the second battery pack 12 alternately charging and discharging, causing the battery pack 10 to heat up, i.e., the battery pack 10 self-heats. In addition, when the first battery pack 11 and the second battery pack 12 alternately charge and discharge, both the first battery pack 11 and the second battery pack 12 are electrically connected to the winding 20. The first battery pack 11 and the second battery pack 12 charge and discharge each other through the winding 20, and the first battery pack 11 and the second battery pack 12 charge the capacitor 50. Thus, the first battery pack 11 and the second battery pack 12 can supply power to the load 100, and the capacitor 50 can also supply power to the load 100.

[0118] That is, in this embodiment of the application, the controller controls the first switch assembly 30 and the second switch assembly 40 to switch between the on state and the off state, so that the first battery pack 11 and the second battery pack 12 are equivalent to having alternating current. The first battery pack 11 and the second battery pack 12 can generate an alternating oscillation effect due to the alternating current, so that the battery pack 10 can be heated. This avoids the need to use external heating to heat the battery pack 10. Furthermore, heating from inside the battery pack 10 can also make the temperature field distribution of the battery pack 10 more uniform and improve the heating efficiency.

[0119] Reference Figure 20 The diagram illustrates a flowchart of a control method provided in an embodiment of this application, which is applied to the battery pack self-heating control system in any of the above embodiments. Figure 20 As shown, the control method includes:

[0120] Step 201: Control the first switch assembly and the second switch assembly to switch between the on state and the off state;

[0121] Step 202: The first battery pack and the second battery pack are alternately charged and discharged through the windings to heat the battery pack, and at least one of the first battery pack, the second battery pack and the capacitor charging is used to supply power to the load.

[0122] In this embodiment, since the connecting line between the first and second battery packs is connected to one end of the winding, and the first and second switching components are connected in series, with the first switching component electrically connected to the positive terminal of the first battery pack and the first terminal of the capacitor, and the second switching component electrically connected to the negative terminal of the second battery pack and the second terminal of the capacitor, and the first and second terminals of the capacitor used to connect the load, the first and second battery packs can charge and discharge each other by switching the on and off states of the first and second switching components. After the first battery pack charges the second battery pack, the second battery pack can charge the first battery pack, causing the current direction of the first battery pack to change periodically, and the current direction of the second battery pack to change periodically, thus effectively creating alternating current between the first and second battery packs. Since the controller is electrically connected to the first and second switching components, it can control the switching of the first and second switching components between the on and off states, thus creating alternating current between the first and second battery packs. The alternating charging and discharging of the first and second battery packs causes the battery pack to heat up, i.e., the battery pack self-heats. In addition, when the first battery pack and the second battery pack are charged and discharged alternately, both the first battery pack and the second battery pack are electrically connected to the winding. The first battery pack and the second battery pack charge and discharge each other through the winding, and the first battery pack and the second battery pack charge the capacitor. Thus, the first battery pack and the second battery pack can supply power to the load, and the capacitor can also supply power to the load.

[0123] That is, in this embodiment of the application, the controller controls the first switch assembly and the second switch assembly to switch between the on state and the off state, so that there is an alternating current between the first battery pack and the second battery pack. The alternating current can generate an alternating oscillation effect between the first battery pack and the second battery pack, so that the battery pack can generate heat. This avoids the need to use external heating to heat the battery pack 10. Furthermore, heating from inside the battery pack can also make the temperature field distribution of the battery pack more uniform and improve the heating efficiency.

[0124] In addition, in some implementations, when the control system is in the first state, the first and second switching components are switched between an on and off state to provide alternating current between the first and second battery packs, and the first and second battery packs are alternately charged and discharged, including:

[0125] In the first half-cycle of each control cycle, the first switching component and the second switching component are switched between the on state and the off state. The first battery pack charges the winding and charges the second battery pack through the winding. The capacitor or the first battery pack and the capacitor are used to supply power to the load.

[0126] During the second half of each control cycle, the first and second switching components are switched between on and off states. The second battery pack charges the winding and charges the first battery pack through the winding. The capacitor or the second battery pack and the capacitor are used to supply power to the load.

[0127] In some implementations, during the first half-cycle of each control cycle, the first and second switching components are switched between an on and off state, the first battery pack charges the winding, and the winding charges the second battery pack, and the capacitor, or the first battery pack and the capacitor, are used to supply power to the load, including:

[0128] During the first time period of the first half-cycle, the first switch assembly is in the closed state, the second switch assembly is in the open state, the first battery pack charges the winding, and the capacitor supplies power to the load.

[0129] During the second time period of the first half-cycle, the first switch assembly is in the open state, the second switch assembly is in the closed state, the winding charges the second battery pack, and the first battery pack and capacitor supply power to the load.

[0130] Additionally, in some implementations, during the second half-cycle of each control cycle, the first and second switching components are switched between an on and off state, the second battery pack charges the winding and, through the winding, charges the first battery pack, and the capacitor, or the second battery pack and the capacitor, are used to supply power to the load, including:

[0131] During the third time period of the second half-cycle, the first switch assembly is controlled to be in the open state, the second switch assembly is controlled to be in the closed state, the second battery pack charges the winding, and the capacitor supplies power to the load.

[0132] During the fourth time period of the second half-cycle, the first switch assembly is in the closed state, the second switch assembly is in the open state, the winding charges the first battery pack, and the second battery pack and capacitor supply power to the load.

[0133] In addition, in some implementations, when the control system is in the second state, the first and second switching components are switched between an on and off state to provide alternating current between the first and second battery packs, and the first and second battery packs are alternately charged and discharged, including:

[0134] The first battery pack has a higher charge than the second battery pack. During the first time period of each control cycle, the first and second switching components are switched between the on and off states. The first switching component is in the closed state and the second switching component is in the off state. The first battery pack charges the winding, and the first battery pack, the second battery pack, and the capacitor supply power to the load.

[0135] During the second time period of each control cycle, the first switch assembly is in the open state, the second switch assembly is in the closed state, the winding charges the second battery pack, and the first and second battery packs supply power to the capacitor and the load.

[0136] In addition, in some implementations, when the control system is in the second state, controlling the first and second switching components to switch between an on and off state to provide alternating current between the first and second battery packs, and the first and second battery packs alternately charging and discharging, further includes:

[0137] When the control system is in the second state, the charge of the second battery pack is greater than that of the first battery pack. During the third time period of each control cycle, the first switch assembly is controlled to be in the open state, the second switch assembly is controlled to be in the closed state, the second battery pack charges the winding, and the first battery pack, the second battery pack and the capacitor supply power to the load.

[0138] During the fourth time period of each control cycle, the first switch assembly is in the closed state, the second switch assembly is in the open state, the winding charges the first battery pack, and the first and second battery packs supply power to the capacitor and the load.

[0139] In addition, in some implementations, the method further includes: in the event of damage to the second battery pack, controlling the first switching assembly and the second switching assembly to alternately be in the on state so that the winding, the first switching assembly, the second switching assembly, and the capacitor form a boost circuit, and the first battery pack supplies power to the load through the boost circuit;

[0140] In the event of a failure of the first battery pack, the first and second switching components are alternately switched on to form a boost circuit, which in turn supplies power to the load through the second battery pack.

[0141] This application provides an electric vehicle that includes the battery self-heating control system described in any of the above embodiments.

[0142] In addition, in this embodiment of the application, the electric vehicle may also include a charging interface, which is electrically connected to the battery pack to charge the battery pack.

[0143] Since the charging interface is electrically connected to the battery pack 10, the battery pack 10 can be charged through the charging interface. Simultaneously, during the charging process, the controller can also control the first switch assembly 30 and the second switch assembly 40 to cause the battery pack 10 to self-heat.

[0144] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0145] Although optional embodiments of the present application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the optional embodiments as well as all changes and modifications falling within the scope of the embodiments of the present application.

[0146] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used merely to distinguish one entity from another, and do not necessarily require or imply any such actual relationship or order between these entities. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the article or terminal device that includes that element.

[0147] The technical solutions provided in this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the principles and implementation methods of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A battery self-heating control system, characterized in that, The control system includes: a battery pack, windings, a first switching assembly, a second switching assembly, a capacitor, and a controller; The battery pack includes a first battery pack and a second battery pack connected in series, with a connecting wire extending between the first battery pack and the second battery pack, and the connecting wire being connected to one end of the winding. The first switch assembly and the second switch assembly are connected in series. The first switch assembly is electrically connected to the positive terminal of the first battery pack and the first terminal of the capacitor, respectively. The second switch assembly is electrically connected to the negative terminal of the second battery pack and the second terminal of the capacitor, respectively. The first and second terminals of the capacitor are used to connect to the load. The other end of the winding is connected between the first switch assembly and the second switch assembly. The load includes a motor controller. The controller is electrically connected to the first switch assembly and the second switch assembly respectively. When the control system is in a first state, the controller controls the first switch assembly and the second switch assembly to switch between an on state and an off state, so that the first battery pack and the second battery pack alternately charge and discharge through the winding, thereby heating the battery pack. At least one of the first battery pack, the second battery pack, and the capacitor is used to supply power to the load. The first state is a vehicle self-heating state. When the control system is in a second state, the controller controls the first switch assembly and the second switch assembly to switch between an on state and an off state, so that the first battery pack and the second battery pack have balanced charge. The first battery pack and the second battery pack are used to supply power to the load.

2. The battery self-heating control system according to claim 1, characterized in that, When the control system is in the first state, the controller controls the first switching component and the second switching component to switch between the on state and the off state in the first half cycle of each control cycle. The first battery pack charges the winding and charges the second battery pack through the winding. The capacitor and / or the first battery pack are used to supply power to the load. During the second half-cycle of each control cycle of the controller, the controller controls the first switching component and the second switching component to switch between an on state and an off state, the second battery pack charges the winding and charges the first battery pack through the winding, and the capacitor and / or the second battery pack is used to supply power to the load.

3. The battery self-heating control system according to claim 2, characterized in that, During the first time period of the first half-cycle, the controller controls the first switching component to be in a closed state and the second switching component to be in an open state, the first battery pack to charge the winding, and the capacitor to supply power to the load. During the second time period of the first half-cycle, the controller controls the first switching component to be in the open state and the second switching component to be in the closed state. The winding charges the second battery pack, and the first battery pack and the capacitor supply power to the load.

4. The battery self-heating control system according to claim 2, characterized in that, During the third time period of the second half-cycle, the controller controls the first switching component to be in the open state and the second switching component to be in the closed state, the second battery pack charges the winding, and the capacitor supplies power to the load. During the fourth time period of the second half-cycle, the controller controls the first switching component to be in a closed state and the second switching component to be in an open state. The winding charges the first battery pack, and the second battery pack and the capacitor supply power to the load.

5. The battery self-heating control system according to claim 1, characterized in that, When the control system is in the second state, the charge of the first battery pack is greater than the charge of the second battery pack. During the first time period of each control cycle, the controller controls the first switch assembly and the second switch assembly to switch between the on and off states, controls the first switch assembly to be in the closed state and the second switch assembly to be in the off state, the first battery pack charges the winding, and the first battery pack, the second battery pack and the capacitor supply power to the load. During the second time period of each control cycle, the controller controls the first switching component to be in the open state and the second switching component to be in the closed state. The winding charges the second battery pack, and the first battery pack and the second battery pack supply power to the capacitor and the load.

6. The battery self-heating control system according to claim 1, characterized in that, When the control system is in the second state, the charge of the second battery pack is greater than that of the first battery pack. During the third time period of each control cycle, the controller controls the first switch assembly to be in the open state and controls the second switch assembly to be in the closed state. The second battery pack charges the winding, and the first battery pack, the second battery pack, and the capacitor supply power to the load. During the fourth time period of each control cycle, the controller controls the first switching component to be in a closed state and the second switching component to be in an open state. The winding charges the first battery pack, and the first battery pack and the second battery pack supply power to the capacitor and the load.

7. The battery self-heating control system according to claim 1, characterized in that, In the event of damage to the second battery pack, the controller controls the first and second switching components to alternately be in the on state, so that the winding, the first switching component, the second switching component, and the capacitor form a boost circuit, through which the first battery pack supplies power to the load; In the event of damage to the first battery pack, the controller controls the first and second switching components to alternately be in the on state, so that the winding, the first switching component, the second switching component, and the capacitor form a boost circuit, through which the second battery pack supplies power to the load.

8. The battery self-heating control system according to claim 1, characterized in that, A switch is provided on the connection line. The switch is electrically connected to the controller. The controller is used to control the switch to be in a conducting state or a disconnected state. When the switching device is in the ON state, the battery pack supplies power to the load and is self-heating; When the switching device is in the off state, the battery pack supplies power only to the load.

9. A control method, characterized in that, The battery self-heating control system applied to any one of claims 1-8 comprises: When the control system is in the first state, it controls the first switch assembly and the second switch assembly to switch between an on state and an off state; the first state is the vehicle self-heating state. The first battery pack and the second battery pack are alternately charged and discharged through the winding to heat the battery pack, and at least one of the first battery pack, the second battery pack, and the capacitor charging is used to supply power to the load; the load includes a motor controller; When the control system is in the second state, the first switching component and the second switching component are controlled to switch between an on state and an off state. This is to balance the charge levels of the first battery pack and the second battery pack, and the first battery pack and the second battery pack are used to supply power to the load.

10. An electric vehicle, characterized in that, It includes the battery self-heating control system according to any one of claims 1-8.

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