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

Abstract

A battery self-heating control system and control method, and an electric vehicle, the control system includes a battery pack (10), a winding (20), a first switch assembly (30), a second switch assembly (40), a capacitor (50), and a controller, the battery pack (10) includes a first battery group (11) and a second battery group (12) connected in series, a connecting wire is drawn between the first battery group (11) and the second battery group (12), the connecting wire 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) switches between the positive electrode of the first battery group (11) and the positive electrode of the capacitor The first switch assembly (30) is electrically connected to a first end of the capacitor (50), the second switch assembly (40) is electrically connected to the negative terminal of the second battery group (12) and the second end of the capacitor (50), the first end and the second end of the capacitor (50) are used to connect to a load (100), the midpoint between the first switch assembly (30) and the second switch assembly (40) is connected to the other end of the winding (20), and a controller is electrically connected to the first switch assembly (30) and the second switch assembly (40), so that the battery pack (10) can generate heat.

Description

[Technical Field]

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS This disclosure claims priority to Chinese Patent Application No. 202211068408.3, published on August 31, 2022, which is incorporated herein by reference in its entirety.

[0002] The present disclosure relates to the technical field of battery self-heating control systems, and more particularly to a battery self-heating control system and control method, and an electric vehicle. [Background technology]

[0003] With the development of science and technology, electric vehicles are becoming the primary means of transportation for people's daily travel. For example, electric vehicles are gradually becoming mainstream. Generally, a battery pack is installed in an electric vehicle, and the battery pack supplies power to a load in the electric vehicle. However, the battery pack is affected by temperature. At low temperatures, the electrical performance of the battery pack deteriorates, which seriously affects the discharge performance of the battery pack, resulting in problems such as a shortened driving range and limited output power during driving.

[0004] In the related art, the battery pack is heated by an external heating method, that is, a battery heater is arranged to heat the battery pack. When it is detected that the temperature of the battery pack is excessively low, a switch inside the battery heater is turned on, so that the resistor of the battery heater is energized to generate heat, and the generated heat flows to the battery pack through an air flow path or a water path to heat the battery pack.

[0005] Due to the long piping of the air flow path and water channel, the heat loss is large, which results in a slow heating speed of the battery pack and a long heating time, which affects the heating effect. Summary of the Invention [Means for solving the problem]

[0006] By providing a battery self-heating control system, the embodiments of the present disclosure solve the problems in the related art that the battery pack has a slow heating rate and a long heating time due to the large heat loss caused by the long piping of the air flow path or water channel, and in addition, the heating effect is affected due to the uneven temperature field distribution of the battery pack when the battery pack is heated through the air flow path or water channel.

[0007] In order to solve the above technical problems, the present disclosure is implemented as follows.

[0008] An embodiment of the present disclosure provides a battery self-heating control system, the control system including a battery pack, a winding, a first switch assembly, a second switch assembly, a capacitor, and a controller.

[0009] The battery pack includes a first battery group and a second battery group connected in series. A connecting wire is drawn between the first battery group and the second battery group. The connecting wire is connected to one end of the winding.

[0010] The first switch assembly and the second switch assembly are connected in series. The first switch assembly is electrically connected to the positive terminals of the first group of batteries and the first end of the capacitor. The second switch assembly is electrically connected to the negative terminals of the second group of batteries and the second end of the capacitor. The first and second ends of the capacitor are used to connect to a load. The other end of the winding is connected between the first switch assembly and the second switch assembly.

[0011] A controller is electrically connected to the first switch assembly and the second switch assembly and configured to control the first switch assembly and the second switch assembly to switch between an on state and an open state to cause the first group of batteries and the second group of batteries to alternately charge and discharge through the winding to heat the battery pack. At least one of the first group of batteries, the second group of batteries, and the capacitor is configured to supply power to a load.

[0012] Optionally, when the control system is in the first state, within a first half period of each control cycle of the controller, the controller is configured to control the first switch assembly and the second switch assembly to switch between an on state and an open state to charge the winding and to control the first group of batteries to charge the second group of batteries via the winding, and the capacitor and / or the first group of batteries are configured to supply power to the load.

[0013] During a second half of each control cycle of the controller, the controller controls the first switch assembly and the second switch assembly to switch between an on state and an open state to charge the winding and controls the second battery group to charge the first battery group through the winding. The capacitor and / or the second battery group are configured to supply power to the load.

[0014] Optionally, within a first period of the first half cycle, the controller controls the first switch assembly to a closed state, controls the second switch assembly to an open state, controls the first group of batteries to charge the winding, and controls the capacitor to supply power to the load.

[0015] During a second period of the first half-cycle, the controller controls the first switch assembly to an open state, controls the second switch assembly to a closed state, controls the winding to charge the second battery group, and controls the first battery group and the capacitor to supply power to the load.

[0016] Optionally, within a third period of the second half cycle, the controller controls the first switch assembly to an open state, controls the second switch assembly to a closed state, controls the second group of batteries to charge the winding, and controls the capacitor to supply power to the load.

[0017] Within a fourth period of the second half-cycle, the controller controls the first switch assembly to a closed state, controls the second switch assembly to an open state, controls the winding to charge the first group of batteries, and controls the second group of batteries and the capacitor to supply power to the load.

[0018] Optionally, when the control system is in the second state, the battery level of the first group of batteries is greater than the battery level of the second group of batteries. Within a first period of each control cycle, the controller controls the first switch assembly and the second switch assembly to switch between an on state and an open state, controls the first switch assembly to a closed state, controls the second switch assembly to an open state, controls the first group of batteries to charge the winding, and controls the first group of batteries, the second group of batteries, and the capacitor to supply power to the load.

[0019] Within a second period of each control cycle, the controller controls the first switch assembly to an open state, controls the second switch assembly to a closed state, controls the winding to charge the second group of batteries, and controls the first group of batteries and the second group of batteries to supply power to the capacitor and the load.

[0020] Optionally, when the control system is in the second state, the battery level of the first group of batteries is greater than the battery level of the second group of batteries. Within a third period of each control cycle, the controller controls the first switch assembly to an open state, controls the second switch assembly to a closed state, controls the second group of batteries to charge the winding, and controls the first group of batteries, the second group of batteries, and the capacitor to supply power to the load.

[0021] Within a fourth period of each control cycle, the controller controls the first switch assembly to a closed state, controls the second switch assembly to an open state, controls the winding to charge the first group of batteries, and controls the first group of batteries and the second group of batteries to supply power to the capacitor and the load.

[0022] Optionally, when the second group of batteries is damaged, the controller controls the first switch assembly and the second switch assembly to be alternately turned on, causing the winding, the first switch assembly, the second switch assembly, and the capacitor to form a boost circuit, and the first group of batteries supplies power to the load via the boost circuit.

[0023] When the first group of batteries is damaged, the controller controls the first switch assembly and the second switch assembly to alternately turn on, causing the winding, the first switch assembly, the second switch assembly, and the capacitor to form a boost circuit, and the second group of batteries supplies power to the load via the boost circuit.

[0024] Optionally, a switch device is disposed on the connecting line, the switch device being electrically connected to a controller, the controller being configured to control the switch device to be in an on state or an open state.

[0025] When the switch device is in the on state, the battery pack supplies power to the load and self-heats.

[0026] When the switch device is in an open state, the battery pack only supplies power to the load.

[0027] According to a second aspect, an embodiment of the present disclosure comprises: controlling the first switch assembly and the second switch assembly to switch between an on state and an open state; and alternately charging and discharging the first group of batteries and the second group of batteries through the winding to heat the battery pack, and configuring at least one of the first group of batteries, the second group of batteries, and the capacitor charging to supply power to a load.

[0028] Optionally, when the control system is in a first state, controlling the first switch assembly and the second switch assembly to switch between an on state and an open state to supply an alternating current between the first group of batteries and the second group of batteries to alternately charge and discharge the first group of batteries and the second group of batteries includes: controlling the first switch assembly and the second switch assembly to switch between an on state and an open state within a first half of each control cycle to charge the winding, controlling the first group of batteries to charge the second group of batteries through the winding, and a capacitor, or the first group of batteries and the capacitor, configured to supply power to a load; and controlling, within a second half of each control cycle, the first switch assembly and the second switch assembly to switch between an on state and an open state to charge the winding, and controlling the second group of batteries to charge the first group of batteries through the winding, and the capacitor, or the second group of batteries and the capacitor, configured to supply power to the load.

[0029] Optionally, the step of controlling, within a first half period of each control cycle, the first switch assembly and the second switch assembly to switch between a controlled on state and an open state to charge the winding, controlling the first group of batteries to charge the second group of batteries via the winding, and the capacitor, or the first group of batteries and the capacitor, is configured to supply power to the load; controlling a first switch assembly to a closed state, a second switch assembly to an open state, a first battery group to charge the winding, and a capacitor to supply power to the load during a first period of a first half cycle; and controlling the first switch assembly to an open state, controlling the second switch assembly to a closed state, controlling the winding to charge the second battery group, and controlling the first battery group and the capacitor to supply power to the load, during a second period of the first half-cycle.

[0030] Optionally, the step of controlling the first switch assembly and the second switch assembly to switch between an on state and an open state within a second half period of each control cycle to charge the winding, controlling the second group of batteries to charge the first group of batteries through the winding, and the capacitor, or the second group of batteries and the capacitor, to supply power to the load, is configured to: during a third period of the second half cycle, controlling the first switch assembly to an open state, controlling the second switch assembly to a closed state, controlling the second battery group to charge the winding, and controlling the capacitor to supply power to the load; and during a fourth period of the first half cycle, controlling the first switch assembly to a closed state, controlling the second switch assembly to an open state, controlling the winding to charge the first group of batteries, and controlling the second group of batteries and the capacitor to supply power to the load.

[0031] Optionally, when the control system is in the second state, controlling the first switch assembly and the second switch assembly to switch between an on state and an open state to supply alternating current between the first group of batteries and the second group of batteries to alternately charge and discharge the first group of batteries and the second group of batteries includes: when the battery level of the first group of batteries is greater than the battery level of the second group of batteries, controlling the first switch assembly and the second switch assembly to switch between an on state and an open state, controlling the first switch assembly to a closed state, controlling the second switch assembly to an open state, controlling the first group of batteries to charge the winding, and controlling the first group of batteries, the second group of batteries, and the capacitor to supply power to the load, within a first period of each control cycle; and controlling, within a second period of each control cycle, the first switch assembly to an open state, the second switch assembly to a closed state, controlling the winding to charge the second group of batteries, and controlling the first group of batteries and the second group of batteries to supply power to a capacitor and a load.

[0032] Optionally, when the control system is in the second state, controlling the first switch assembly and the second switch assembly to switch between an on state and an open state to supply an alternating current between the first group of batteries and the second group of batteries to alternately charge and discharge the first group of batteries and the second group of batteries includes: When the control system is in a second state, when the battery level of the first group of batteries is greater than the battery level of the second group of batteries, within a third time period of each control cycle, controlling the first switch assembly to an open state, controlling the second switch assembly to a closed state, controlling the second group of batteries to charge the winding, and controlling the first group of batteries, the second group of batteries, and the capacitor to supply power to the load; and controlling the first switch assembly to a closed state, controlling the second switch assembly to an open state, controlling the winding to charge the first group of batteries, and controlling the first group of batteries and the second group of batteries to supply power to a capacitor and a load within a fourth period of each control cycle.

[0033] Optionally, the method includes, when the second group of batteries is damaged, controlling the first switch assembly and the second switch assembly to be alternately turned on, causing the winding, the first switch assembly, the second switch assembly, and the capacitor to form a boost circuit, and causing the first group of batteries to supply power to the load via the boost circuit; If the first group of batteries is damaged, the method further includes controlling the first switch assembly and the second switch assembly to be alternately turned on, causing the winding, the first switch assembly, the second switch assembly, and the capacitor to form a boost circuit, and causing the second group of batteries to supply power to the load via the boost circuit.

[0034] According to a third aspect, embodiments of the present disclosure provide an electric vehicle including the aforementioned battery self-heating control system according to any of the first aspects.

[0035] In an embodiment of the present disclosure, a connecting wire drawn between the first group of batteries and the second group of batteries is 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 group of batteries and the first end of the capacitor. The second switch assembly is electrically connected to the negative terminal of the second group of batteries and the second end of the capacitor. The first and second ends of the capacitor are used to connect to a load. Thus, the first and second switch assemblies can be switched between an on state and an open state, so that the first and second groups of batteries can charge or discharge each other. After the first group of batteries charges the second group of batteries, the first group of batteries can be charged via the second group of batteries, so that the current direction in the first group of batteries periodically changes and the current direction in the second group of batteries periodically changes, which corresponds to the existence of an alternating current between the first and second groups of batteries. The controller is electrically connected to the first switch assembly and the second switch assembly. The controller may control the first switch assembly and the second switch assembly to switch between an on state and an open state, which corresponds to an alternating current existing between the first group of batteries and the second group of batteries, causing the first group of batteries and the second group of batteries to alternately charge and discharge, heating the battery pack (i.e., self-heating of the battery pack). Additionally, when the first group of batteries and the second group of batteries alternately charge and discharge, both the first group of batteries and the second group of batteries are electrically connected to the winding, causing the first group of batteries and the second group of batteries to charge and discharge each other through the winding, and the first group of batteries and the second group of batteries to charge the capacitor. As a result, the first group of batteries and the second group of batteries can supply power to the load, and the capacitor can also supply power to the load.

[0036] In other words, in an embodiment of the present disclosure, the controller controls the first switch assembly and the second switch assembly to switch between an on state and an open state, which corresponds to the presence of an alternating current between the first battery group and the second battery group. The alternating current can create a cross-vibration effect between the first battery group and the second battery group, which results in the battery pack heating, thereby avoiding the need to heat the battery pack using an external heating method. In addition, heating is performed internally in the battery pack, which results in a uniform temperature field distribution in the battery pack and improved heating efficiency. [Brief explanation of the drawings]

[0037] [Figure 1] 1 is a schematic diagram of a battery self-heating control system according to one embodiment of the present disclosure. [Figure 2] 2 is a schematic diagram of a battery self-heating control system according to one embodiment of the present disclosure. [Figure 3] 3 is a schematic diagram of a battery self-heating control system according to one embodiment of the present disclosure. [Figure 4] 1 is a schematic diagram of current flow direction in a first state according to one embodiment of the present disclosure. FIG. [Figure 5] 2 is a schematic diagram of current flow direction in a first state according to an embodiment of the present disclosure. [Figure 6] 3 is a schematic diagram of current flow direction in a first state according to an embodiment of the present disclosure. [Figure 7] 4 is a schematic diagram of current flow direction in a first state according to an embodiment of the present disclosure. [Figure 8] 1 is a schematic diagram of current flow direction in a second state according to an embodiment of the present disclosure. FIG. [Figure 9] 2 is a schematic diagram of current flow direction in a second state according to an embodiment of the present disclosure. [Figure 10] 3 is a schematic diagram of current flow direction in a second state according to an embodiment of the present disclosure. [Figure 11] 4 is a schematic diagram of current flow direction in a second state according to an embodiment of the present disclosure. [Figure 12] 1 is a schematic diagram of current flow direction in a third state according to an embodiment of the present disclosure. FIG. [Figure 13] 2 is a schematic diagram of current flow direction in a third state according to an embodiment of the present disclosure. [Figure 14] 3 is a schematic diagram of current flow direction in a third state according to an embodiment of the present disclosure. [Figure 15] 4 is a schematic diagram of current flow direction in a third state according to an embodiment of the present disclosure. [Figure 16] 1 is a schematic diagram of current flow direction when the second battery group is damaged, according to one embodiment of the present disclosure. [Figure 17] FIG. 2 is a schematic diagram of current flow direction when the second group of cells is damaged, according to one embodiment of the present disclosure. [Figure 18] 1 is a schematic diagram of current flow direction when the first group of batteries is damaged, according to one embodiment of the present disclosure. [Figure 19] 2 is a schematic diagram of current flow direction when the first group of cells is damaged, according to one embodiment of the present disclosure. [Figure 20] 1 is a flowchart of a control method according to one embodiment of the present disclosure. [Explanation of symbols]

[0038] 10: Battery pack 20: Winding 30: First switch assembly 40: Second switch assembly 50: Capacitor 60: Switch device 11: First battery group 12: Second battery group 100: Load 101: Electric motor controller: 102: Other high voltage loads DETAILED DESCRIPTION OF THE INVENTION

[0039] Hereinafter, the technical solutions in the embodiments of the present disclosure will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present disclosure. Obviously, the described embodiments are not all of the embodiments, but only some of the embodiments of the present disclosure. All other embodiments obtained by those skilled in the art based on the embodiments of the present disclosure without creative efforts shall fall within the protection scope of the present disclosure.

[0040] It should be understood that references throughout this specification to "an embodiment" or "one embodiment" mean that a particular feature, structure, or characteristic associated with an embodiment is included in at least one embodiment of the present disclosure. Thus, the appearances of "in one embodiment" or "in one embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. In addition, particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0041] As shown in FIG. 1, the battery self-heating control system includes a battery pack 10, a winding 20, a first switch assembly 30, a second switch assembly 40, a capacitor 50, and a controller (not shown).

[0042] The battery pack 10 includes a first battery group 11 and a second battery group 12 connected in series. A connecting wire is drawn between the first battery group 11 and the second battery group 12. The connecting wire is connected to one end of a 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 a first end of a capacitor 50. The second switch assembly 40 is electrically connected to the negative terminal of the second battery group 12 and a second end of the capacitor 50. The first and second ends of the capacitor 50 are used to connect to a 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. The controller is configured to control the first switch assembly 30 and the second switch assembly 40 to switch between an on state and an open state, causing the first battery group 11 and the second battery group 12 to alternately charge and discharge through the winding 20 to heat the battery pack 10. At least one of the first battery group 11, the second battery group 12, and the capacitor 50 is configured to supply power to a load.

[0043] In the embodiment of the present disclosure, the connecting wire drawn between the first battery group 11 and the second battery group 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. The first switch assembly 30 is electrically connected to the positive terminal of the first battery group 11 and a first end of the capacitor 50. The second switch assembly 40 is electrically connected to the negative terminal of the second battery group 12 and a second end of the capacitor 50. The first and second ends of the capacitor 50 are used to connect to the load 100. Therefore, the first switch assembly 30 and the second switch assembly 40 can be switched between an on state and an open state, so that the first battery group 11 and the second battery group 12 can charge or discharge each other. After the first battery group 11 charges the second battery group 12, the first battery group 11 may be charged via the second battery group 12, resulting in a periodic change in the direction of current through the first battery group 11 and a periodic change in the direction of current through the second battery group 12, which corresponds to an alternating current existing between the first battery group 11 and the second battery group 12. The controller is electrically connected to the first switch assembly 30 and the second switch assembly 40. The controller therefore controls the first switch assembly 30 and the second switch assembly 40 to switch between an on state and an open state, which corresponds to an alternating current existing between the first battery group 11 and the second battery group 12, causing the first battery group 11 and the second battery group 12 to alternately charge and discharge, heating the battery pack 10, i.e., self-heating of the battery pack 10. In addition, when the first battery group 11 and the second battery group 12 alternately charge and discharge, both the first battery group 11 and the second battery group 12 are electrically connected to the winding 20, the first battery group 11 and the second battery group 12 charge and discharge each other via the winding 20, and the first battery group 11 and the second battery group 12 charge the capacitor 50, and as a result, the first battery group 11 and the second battery group 12 can supply power to the load 100, and the capacitor 50 can also supply power to the load 100.

[0044] In other words, in the embodiment of the present disclosure, the controller controls the first switch assembly 30 and the second switch assembly 40 to switch between an on state and an open state, which corresponds to the existence of an alternating current between the first battery group 11 and the second battery group 12. The alternating current can create a cross-vibration effect between the first battery group 11 and the second battery group 12, which results in the battery pack 10 generating heat, thereby avoiding the need to heat the battery pack 10 using an external heating method. In addition, heating is performed internally in the battery pack 10, which can result in a uniform temperature field distribution in the battery pack 10 and improve heating efficiency.

[0045] Note that when the first battery group 11 charges the second battery group 12, the current direction in the first battery group 11 is a first direction. Note that when the second battery group 12 charges the first battery group 11, the current direction in the first battery group 11 is a second direction. The first direction is opposite to the second direction. The first battery group 11 and the second battery group 12 alternately charge and discharge, resulting in the current direction in the first battery group 11 being alternately switched. This corresponds to the first battery group 11 having an alternating current, which allows the first battery group 11 to self-heat. For details about self-heating of the second battery group 12, please refer to the self-heating process of the first battery group 11, and details will not be repeated here.

[0046] It is further noted that in embodiments of the present disclosure, windings 20 may be inductors. When the control system is used in an electric vehicle, the electric vehicle includes an electric motor, and windings 20 of the electric motor may be used as windings 20 in the control system, i.e., battery pack 10 is electrically connected to windings 20 of the electric motor. Additionally, windings 20 may alternatively be another component specifically configured to store energy, or alternatively may be a component configured to carry and transfer energy via alternating current.

[0047] Additionally, in embodiments of the present disclosure, when the control system is used in an electric vehicle, the controller may be a body control module (BCM) of the electric vehicle. Indeed, the controller may alternatively be another controller having control functions in the electric vehicle. This is not limited to embodiments of the present disclosure.

[0048] Additionally, in the embodiment of the present disclosure, the first switch assembly 30 and the second switch assembly 40 may be insulated gate bipolar transistors (IGBTs) or metal oxide semiconductor field effect transistors (MOSFETs). Indeed, the first switch assembly 30 and the second switch assembly 40 may alternatively be of other types. For example, the first switch assembly 30 and the second switch assembly 40 may alternatively be other thyristors. Additionally, in the embodiment of the present disclosure, when the control system is used in an electric vehicle, as shown in FIG. 3 , the bridge arms of an electric motor controller in the electric vehicle may be used as the first switch assembly 30 and the second switch assembly 40, i.e., the battery pack 10 is electrically connected to the bridge arms of the electric motor controller.

[0049] Additionally, in embodiments of the present disclosure, capacitor 50 may be an additional, independent capacitor 50. If the control system is used in an electric vehicle, capacitor 50 may alternatively be integrated with electric motor controller 101 within the electric vehicle, or capacitor 50 may alternatively be integrated with other high-voltage loads 102 within the electric vehicle. Indeed, capacitor 50 may alternatively not be integrated with electric motor controller 101 or other high-voltage loads 102. This is not a limitation in embodiments of the present disclosure.

[0050] Additionally, in embodiments of the present disclosure, when the control system is used in an electric vehicle, the load 100 may be an electric motor controller 101 and other high voltage loads 102. Indeed, the load 100 may alternatively be simply other high voltage loads 102, or alternatively simply the electric motor controller 101.

[0051] Additionally, in the disclosed embodiment, the first switch assembly 30 and the second switch assembly 40 have different conduction states at the same moment: when the first switch assembly 30 is in the on state, the second switch assembly 40 is in the open state, and when the first switch assembly 30 is in the open state, the second switch assembly 40 is in the on state.

[0052] Additionally, in the embodiment of the present disclosure, the first battery group 11 and the second battery group 12 may each be an independent battery pack 10. Indeed, the first battery group 11 and the second battery group 12 may be two parts of the same battery pack 10. In this case, the center line of the battery pack 10 is drawn. Additionally, the first battery group 11 may include several battery cores connected in series or parallel, and the second battery group 12 may include several battery cores connected in series or parallel. The number of battery cores in the first battery group 11 and the number of battery cores in the second battery group 12 may or may not be the same. This is not a limitation in the embodiment of the present disclosure.

[0053] Additionally, in some embodiments, as shown in FIGS. 4 to 7 , when the control system is in a first state, within a first half period of each control cycle of the controller, the controller is configured to control the first switch assembly 30 and the second switch assembly 40 to switch between an on state and an open state, to charge the winding 20, and to control the first group of batteries 11 to charge the second group of batteries 12 via the winding 20. The capacitor 50 and / or the first group of batteries 11 are configured to supply power to the load 100. Within a second half period of each control cycle of the controller, the controller is configured to control the first switch assembly 30 and the second switch assembly 40 to switch between an on state and an open state, to charge the winding 20, and to control the second group of batteries 12 to charge the first group of batteries 11 via the winding 20. The capacitor 50 and / or the second group of batteries 12 are configured to supply power to the load 100.

[0054] When the control system is in the first state, the controller's control cycle includes several cycles. Within each control cycle, within the first half period of each control cycle, the controller controls the first switch assembly 30 and the second switch assembly 40 to switch between an on state and an open state. When the first switch assembly 30 is on, the second switch assembly 40 is off, and when the first switch assembly 30 is off, the second switch assembly 40 is on. As a result, the voltages of the first battery group 11 and the second battery group 12 are different. The first battery group 11 charges the winding 20, which then charges the second battery group 12 via the winding 20. When the first battery group 11 charges the winding 20, the electrical energy of the first battery group 11 is also transferred to the capacitor 50, and as a result, the capacitor 50 and / or the first battery group 11 also charge the load. During the second half of each control cycle, the controller controls the first switch assembly 30 and the second switch assembly 40 to switch between an on state and an open state. When the first switch assembly 30 is on, the second switch assembly 40 is off, and when the first switch assembly 30 is off, the second switch assembly 40 is on. Therefore, the voltages of the first battery group 11 and the second battery group 12 are different, and the second battery group 12 charges the winding 20 and, through the winding 20, charges the first battery group 11. When the second battery group 12 charges the winding 20, the electrical energy of the second battery group 12 is also transferred to the capacitor 50, and as a result, the capacitor 50 and / or the second battery group 12 also charge the load.

[0055] Specifically, the first half-cycle may include a first period and a second period, the second half-cycle may include a third period and a fourth period, the first period and the second period forming a complete first half-cycle, and the third period and the fourth period forming a complete second half-cycle.

[0056] During a first period of the first half cycle, the controller controls the first switch assembly 30 to a closed state, the second switch assembly 40 to an open state, the first battery group 11 to charge the winding 20, and the capacitor 50 to supply power to the load. During a second period of the first half cycle, the controller controls the first switch assembly 30 to an open state, the second switch assembly 40 to a closed state, the winding 20 to charge the second battery group 12, and the first battery group 11 and the capacitor 50 to supply power to the load.

[0057] As shown in FIG. 4 , when the first switch assembly 30 is controlled to be in a closed state and the second switch assembly 40 is controlled to be in an open state during a first period, the voltage of the first battery group 11 becomes greater than the voltage of the second battery group 12, and the first battery group 11 charges the winding 20, allowing the winding 20 to store electrical energy, which is then used to power the load 100. As shown in FIG. 5 , when the first switch assembly 30 is in an open state and the second switch assembly 40 is in a closed state during a second period, the first battery group 11 is connected in series to the winding 20, causing the first battery group 11 and the winding 20 to jointly supply power to the load 100 and the winding 20 to charge the second battery group 12. When the controller controls the first switch assembly 30 to cycle through states within a first period and a second period and controls the second switch assembly 40 to cycle through states within a first period and a second period, it corresponds to the first switch assembly 30, the second switch assembly 40, the winding 20, and the capacitor 50 forming a boost circuit, such that the first battery group 11 supplies power to the load 100 via the boost circuit, the first battery group 11 continuously discharges to the second battery group 12, and the second battery group 12 continuously charges.

[0058] During a third period of the second half cycle, the controller controls the first switch assembly to an open state, the second switch assembly to a closed state, the second battery group to charge the winding, and the capacitor to supply power to the load. During a fourth period of the second half cycle, the controller controls the first switch assembly to a closed state, the second switch assembly to an open state, the winding to charge the first battery group, and the second battery group and the capacitor to supply power to the load.

[0059] During a third period, the controller controls the first switch assembly 30 to be in an open state and the second switch assembly 40 to be in a closed state. During a fourth period, the controller controls the first switch assembly 30 to be in a closed state and the second switch assembly 40 to be in an open state. As shown in FIG. 6 , during the third period, when the first switch assembly 30 is in an open state and the second switch assembly 40 is in a closed state, after the first battery group 11 is continuously charged, the voltage of the second battery group 12 becomes greater than the voltage of the first battery group 11. The second battery group 12 charges the winding 20, allowing the winding 20 to store electrical energy. The electrical energy stored in the capacitor 50 is used to power the load 100. As shown in FIG. 7, when the first switch assembly 30 is in a closed state and the second switch assembly 40 is in an open state within the fourth period, this corresponds to the second battery group 12 being connected in series with the winding 20, such that the second battery group 12 and the winding 20 jointly supply power to the load 100 and the winding 20 charges the first battery group 11. When the controller controls the first switch assembly 30 to cycle through states within the third and fourth periods and controls the second switch assembly 40 to cycle through states within the third and fourth periods, it corresponds to the first switch assembly 30, the second switch assembly 40, the winding 20, and the capacitor 50 forming a boost circuit, such that the second battery group 12 supplies power to the load 100 via the boost circuit, the second battery group 12 continuously discharges the first battery group 11, and the first battery group 11 continuously charges.

[0060] When the controller controls the first switch assembly 30 and the second switch assembly 40 over several control cycles, each control cycle is cyclical, i.e., the states of the first switch assembly 30 and the second switch assembly 40 are cyclical within the control cycle, resulting in the first battery group 11 and the second battery group 12 alternately charging and discharging. Specifically, during the first and second periods of the first half period of each control cycle, the first battery group 11 discharges to the second battery group 12, and the second battery group 12 is charged. During the third and fourth periods of the second half period, the second battery group 12 discharges to the first battery group 11, and the first battery group 11 is charged. Furthermore, when the first battery group 11 and the second battery group 12 are alternately charged and discharged, this corresponds to the existence of an alternating current between the first battery group 11 and the second battery group 12, and as a result, the battery pack 10 can self-heat.

[0061] Additionally, when the controller cycles through the control cycles, i.e., after the first, second, third, and fourth periods, the control of the first switch assembly 30 and the second switch assembly 40 within the first, second, third, and fourth periods is repeated. During the fourth period of the previous control cycle within one control cycle, the second battery group 12 charges the first battery group 11, resulting in the voltage of the first battery group 11 being greater than the voltage of the second battery group 12. After the cycle, the first battery group 11 charges the second battery group 12 within the first period of the current control cycle, and the cycle is repeated.

[0062] For example, the first control cycle is adjacent to the second control cycle, the second control cycle is a current control cycle, and the first control cycle is the control cycle before the second control cycle. During the fourth period of the first control cycle, the second battery group 12 charges the first battery group 11, resulting in the voltage of the first battery group 11 being greater than the voltage of the second battery group 12. Next, the first period of the second control cycle begins, during which the first battery group 11 charges the second battery group 12.

[0063] Note that each control cycle may have a short duration. For example, the duration of a control cycle may be 1 millisecond. Furthermore, the first period, the second period, the third period, and the fourth period form a complete control cycle. Specifically, the first period and the second period form a first half-cycle, the third period and the fourth period form a second half-cycle, and the first half-cycle and the second half-cycle form a complete control cycle.

[0064] Additionally, in an embodiment of the present disclosure, when the control system is used in an electric vehicle, the first state may be a state in which the electric vehicle is in a running self-heating state, i.e., the first state may be a running self-heating state, which corresponds to the battery pack 10 self-heating while running, i.e., while the electric vehicle is moving.

[0065] Additionally, in some embodiments, as shown in Figures 8-11, when the battery level of the first group of batteries 11 is different from the battery level of the second group of batteries 12, the control system is in a second state. When the control system is in the second state, the battery level of the first group of batteries 11 is greater than the battery level of the second group of batteries 12. Within a first period of each control cycle, the controller controls the first switch assembly 30 and the second switch assembly 40 to switch between an on state and an open state, controls the first switch assembly 30 to be in a closed state, controls the second switch assembly 40 to be in an open state, controls the first group of batteries 11 to charge the winding 20, and controls the first group of batteries 11, the second group of batteries 12, and the capacitor 50 to supply power to the load 100. During a second period of each control cycle, the controller controls the first switch assembly 30 to an open state, the second switch assembly 40 to a closed state, the winding 20 to charge the second battery group 12, and the first battery group 11 and the second battery group 12 to supply power to the capacitor 50 and the load 100. Additionally, when the control system is in the second state, the battery level of the second battery group 12 is greater than the battery level of the first battery group 11. During a third period of each control cycle, the controller controls the first switch assembly 30 to an open state, the second switch assembly 40 to a closed state, the second battery group 12 to charge the winding 20, and the first battery group 11 and the second battery group 12 and the capacitor 50 to supply power to the load 100. Within a fourth period, the controller controls the first switch assembly 30 to a closed state, controls the second switch assembly 40 to an open state, controls the winding 20 to charge the first battery group 11, and controls the first battery group 11 and the second battery group 12 to supply power to the capacitor and the load 100.

[0066] When the control system is used in an electric vehicle, the second state may be a balanced state, i.e., the battery levels of the first battery group 11 and the second battery group 12 are balanced. For example, during driving, if the battery levels of the first battery group 11 and the second battery group 12 are different, the balancing function may be activated, so that the electric vehicle is in a balanced state.

[0067] Additionally, as shown in FIG. 8 , when the battery level of the first battery group 11 is greater than the battery level of the second battery group 12, the controller controls the first switch assembly 30 to be in a closed state and the second switch assembly 40 to be in an open state during a first period. In this case, the first battery group 11 is connected in series to the first switch assembly 30 and charges the winding 20 via the first switch assembly 30. Additionally, the first battery group 11 is connected in series to the second battery group 12, and the first battery group 11 and the second battery group 12 supply power to the load 100, and the capacitor 50 also supplies power to the load 100. As shown in FIG. 9 , during a second period, the controller controls the first switch assembly 30 to be in an open state and the second switch assembly 40 to be in a closed state. In this case, winding 20 and second group of cells 12 form a complete path through second switch assembly 40, and winding 20 charges second group of cells 12. In addition, first group of cells 11 is connected in series with second group of cells 12, and first group of cells 11 and second group of cells 12 power load 100 and charge capacitor 50.

[0068] It should be noted that the first period and the second period may form a control cycle, and the first period and the second period are repeated alternately, resulting in the first battery group 11 continuously discharging to the second battery group 12, and finally the battery levels of the first battery group 11 and the second battery group 12 are balanced, and the first battery group 11 and the second battery group 12 supply power to the load 100.

[0069] Additionally, as shown in FIG. 10 , if the battery level of the second battery group 12 is greater than the battery level of the first battery group 11, during a third period, the controller controls the first switch assembly 30 to be in an open state and the second switch assembly 40 to be in a closed state. In this case, the second battery group 12 is connected in series to the second switch assembly 40 and charges the winding 20 via the second switch assembly 40. Additionally, the second battery group 12 is connected in series with the first battery group 11, and the second battery group 12 and the first battery group 11 supply power to the load 100, and the capacitor 50 also supplies power to the load 100. As shown in FIG. 11 , during a fourth period, the controller controls the first switch assembly 30 to be in a closed state and the second switch assembly 40 to be in an open state. In this case, winding 20 and first group of batteries 11 form a complete path through first switch assembly 30, and winding 20 charges first group of batteries 11. In addition, first group of batteries 11 is connected in series with second group of batteries 12, and first group of batteries 11 and second group of batteries 12 power load 100 and charge capacitor 50.

[0070] It should be noted that the third period and the fourth period may form a control cycle, and the third period and the fourth period are repeated alternately, resulting in the second battery group 12 continuously discharging the first battery group 11, and finally the battery levels of the second battery group 12 and the first battery group 11 are balanced, and the first battery group 11 and the second battery group 12 supply power to the load 100.

[0071] In an embodiment of the present disclosure, when the battery level of the first battery group 11 is greater than that of the second battery group 12, the controller alternately and cyclically controls the first switch assembly 30 and the second switch assembly 40 in a first period and a second period, so that the first battery group 11 continuously discharges to the second battery group 12, and the battery levels of the first battery group 11 and the second battery group 12 are balanced. When the battery level of the second battery group 12 is greater than that of the first battery group 11, the controller alternately and cyclically controls the first switch assembly 30 and the second switch assembly 40 in a third period and a fourth period, so that the second battery group 12 continuously discharges to the first battery group 11, and the battery levels of the second battery group 12 and the first battery group 11 are balanced.

[0072] Additionally, in some embodiments, as shown in Figures 12 through 15, when the control system is in a third state, within each control cycle of the controller, during a first period, the controller controls the first switch assembly 30 to a closed state, the second switch assembly 40 to an open state, and the first group of batteries 11 to charge the winding 20. During a second period, the controller controls the first switch assembly 30 to an open state, the second switch assembly 40 to a closed state, and the winding 20 to charge the second group of batteries 12. During a third period, the controller controls the first switch assembly 30 to an open state, the second switch assembly 40 to a closed state, and the second group of batteries 12 to charge the winding 20. During a fourth period, the controller controls the first switch assembly 30 to a closed state, the second switch assembly 40 to an open state, and the winding 20 to charge the first group of batteries 11.

[0073] When the control system is used in an electric vehicle, the third state may be a parking heating state, i.e., a state in which the electric vehicle is stopped and the battery pack 10 is self-heating. For example, when the electric vehicle is stopped 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 enters the third state.

[0074] Additionally, when the control system is in the first state, the controller's control cycle includes several cycles. Within each control cycle, during a first period, the controller controls the first switch assembly 30 to be in a closed state and the second switch assembly 40 to be in an open state. During a second period, the controller controls the first switch assembly 30 to be in an open state and the second switch assembly 40 to be in a closed state. As shown in FIG. 12 , during the first period, when the first switch assembly 30 is in a closed state and the second switch assembly 40 is in an open state, the voltage of the first battery group 11 becomes greater than the voltage of the second battery group 12, and the first battery group 11 charges the winding 20, allowing the winding 20 to store electrical energy. As shown in FIG. 13 , during the second period, the first switch assembly 30 is in an open state and the second switch assembly 40 is in a closed state. In this case, winding 20 and second group of batteries 12 form a complete path through second switch assembly 40, and winding 20 charges second group of batteries 12. When the controller controls first switch assembly 30 to cycle states within a first period and a second period and controls second switch assembly 40 to cycle states within the first period and a second period, first group of batteries 11 continuously discharges second group of batteries 12, and second group of batteries 12 continuously charges.

[0075] During the third period, the controller controls the first switch assembly 30 to be in an open state and the second switch assembly 40 to be in a closed state. During the fourth period, the controller controls the first switch assembly 30 to be in a closed state and the second switch assembly 40 to be in an open state. As shown in FIG. 14 , during the third period, when the first switch assembly 30 is in an open state and the second switch assembly 40 is in a closed state, after the first battery group 11 is continuously charged, the voltage of the second battery group 12 becomes greater than the voltage of the first battery group 11. The second battery group 12 charges the winding 20, allowing the winding 20 to store electrical energy. The electrical energy stored in the capacitor 50 is used to power the load 100. As shown in FIG. 15 , during the fourth period, the first switch assembly 30 is in a closed state and the second switch assembly 40 is in an open state. In this case, winding 20 and first group of batteries 11 form a complete path through first switch assembly 30, and winding 20 charges first group of batteries 11. If the controller controls first switch assembly 30 to cycle states within the third and fourth periods and controls second switch assembly 40 to cycle states within the third and fourth periods, second group of batteries 12 continuously discharges first group of batteries 11, and first group of batteries 11 continuously charges.

[0076] When the controller controls the first switch assembly 30 and the second switch assembly 40 over several control cycles, each control cycle corresponds to a cycle in which the states of the first switch assembly 30 and the second switch assembly 40 are cycled, resulting in the first battery group 11 and the second battery group 12 alternately charging and discharging. Specifically, during the first and second periods of each control cycle, the first battery group 11 discharges to the second battery group 12, and the second battery group 12 is charged. During the third and fourth periods of each control cycle, the second battery group 12 discharges to the first battery group 11, and the first battery group 11 is charged. Furthermore, when the first battery group 11 and the second battery group 12 alternately charge and discharge, this corresponds to an AC current being present between the first battery group 11 and the second battery group 12, and as a result, the battery pack 10 can self-heat.

[0077] Additionally, when the controller cycles through the control cycles, i.e., after the first, second, third, and fourth periods, the control of the first switch assembly 30 and the second switch assembly 40 within the first, second, third, and fourth periods is repeated. During the fourth period of the previous control cycle within one control cycle, the second battery group 12 charges the first battery group 11, resulting in the voltage of the first battery group 11 being greater than the voltage of the second battery group 12. After the cycle, the first battery group 11 charges the second battery group 12 within the first period of the current control cycle, and the cycle is repeated.

[0078] For example, the first control cycle is adjacent to the second control cycle, the second control cycle is a current control cycle, and the first control cycle is the control cycle before the second control cycle. During the fourth period of the first control cycle, the second battery group 12 charges the first battery group 11, resulting in the voltage of the first battery group 11 being greater than the voltage of the second battery group 12. Next, the first period of the second control cycle begins, during which the first battery group 11 charges the first battery group 11.

[0079] 16 to 19, if the second battery group 12 is damaged, the controller controls the first switch assembly 30 and the second switch assembly 40 to be alternately turned on, so that the winding 20, the first switch assembly 30, the second switch assembly 40, and the capacitor 50 form a boost circuit, and the first battery group 11 supplies power to the load 100 via the boost circuit. If the first battery group 11 is damaged, the controller controls the first switch assembly 30 and the second switch assembly 40 to be alternately turned on, so that the winding 20, the first switch assembly 30, the second switch assembly 40, and the capacitor 50 form a boost circuit. The second battery group 12 supplies power to the load 100 via the boost circuit.

[0080] If the second battery group 12 is damaged, the second battery group 12 cannot supply power to the load 100, and only the first battery group 11 supplies power to the load 100. The controller controls the first switch assembly 30 and the second switch assembly 40 to alternately switch to the on state. As shown in FIG. 16 , during a first period, the first switch assembly 30 is closed and the second switch assembly 40 is on, and the first battery group 11 charges the winding 20 through the first switch assembly 30, and the electrical energy stored in the capacitor 50 is used to supply power to the load 100. As shown in FIG. 17 , during a second period, the first switch assembly 30 is open and the second switch assembly 40 is on, and the first battery group 11 is connected in series with the winding 20 to charge the capacitor 50 and supply power to the load 100. That is, the first switch assembly 30 is switched between an on state and an open state, and the second switch assembly 40 is switched between an on state and an open state. When the first switch assembly 30 is turned on, the second switch assembly 40 is turned off, and when the first switch assembly 30 is turned off, the second switch assembly 40 is turned on, so that the winding 20, the first switch assembly 30, the second switch assembly 40, and the capacitor 50 can form a boost circuit, and the voltage of the first battery group 11 can be boosted to meet the voltage required by the load 100, that is, the first battery group 11 supplies power to the load 100.

[0081] If the first battery group 11 is damaged, the first battery group 11 cannot supply power to the load 100, and only the second battery group 12 supplies power to the load 100. The controller controls the first switch assembly 30 and the second switch assembly 40 to be alternately turned on. As shown in FIG. 18 , during a third period, the first switch assembly 30 is in an open state and the second switch assembly 40 is in an on state, and the second battery group 12 charges the winding 20 through the second switch assembly 40, and the electrical energy stored in the capacitor 50 is used to supply power to the load 100. As shown in FIG. 19 , during a fourth period, the first switch assembly 30 is in an on state and the second switch assembly 40 is in an open state, and the second battery group 12 is connected in series with the winding 20 to charge the capacitor 50 and supply power to the load 100. That is, the first switch assembly 30 is switched between an on state and an open state, and the second switch assembly 40 is switched between an on state and an open state. When the first switch assembly 30 is turned on, the second switch assembly 40 is turned off, and when the first switch assembly 30 is turned off, the second switch assembly 40 is turned on, so that the winding 20, the first switch assembly 30, the second switch assembly 40, and the capacitor 50 can form a boost circuit, and the voltage of the second battery group 12 can be boosted to meet the voltage required by the load 100, that is, the second battery group 12 supplies power to the load 100.

[0082] Additionally, in some embodiments, a switch device 60 is disposed on the connecting line, as shown in FIG. 2 or FIG. 3 . The switch device 60 is electrically connected to a controller. The controller is configured to control the switch device 60 to be in an on state or an open state. When the switch device 60 is in an on state, the battery pack 10 supplies power to the load 100 and self-heats. When the switch device 60 is in an open state, the battery pack 10 only supplies power to the load 100.

[0083] When the switch device 60 is disposed on the connecting line and electrically connected to the controller, in this case, as shown in FIG. 2 , when the battery pack 10 simply needs to supply power to the load 100, the controller controls the switch device 60 to an open state, and the first battery group 11 and the second battery group 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 device 60 to an on state, and controls the first switch assembly 30 and the second switch assembly 40 to be alternately switched between the on state and the open state, so that the battery pack 10 can self-heat and supply power to the load 100. In other words, the switch device 60 is disposed on the connecting line, thereby achieving functional versatility of the control system.

[0084] It should be noted that the switch device 60 may be an IGBT or a MOSFET. The specific type of the switch device 60 is not limited to the embodiments of the present disclosure.

[0085] In the embodiment of the present disclosure, the connecting wire drawn between the first battery group 11 and the second battery group 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. The first switch assembly 30 is electrically connected to the positive terminal of the first battery group 11 and a first end of the capacitor 50. The second switch assembly 40 is electrically connected to the negative terminal of the second battery group 12 and a second end of the capacitor 50. The first and second ends of the capacitor 50 are used to connect to the load 100. Therefore, the first switch assembly 30 and the second switch assembly 40 can be switched between an on state and an open state, so that the first battery group 11 and the second battery group 12 can charge or discharge each other. After the first battery group 11 charges the second battery group 12, the first battery group 11 may be charged via the second battery group 12, resulting in a periodic change in the direction of current through the first battery group 11 and a periodic change in the direction of current through the second battery group 12, which corresponds to an alternating current existing between the first battery group 11 and the second battery group 12. The controller is electrically connected to the first switch assembly 30 and the second switch assembly 40. The controller therefore controls the first switch assembly 30 and the second switch assembly 40 to switch between an on state and an open state, which corresponds to an alternating current existing between the first battery group 11 and the second battery group 12, causing the first battery group 11 and the second battery group 12 to alternately charge and discharge, heating the battery pack 10, i.e., self-heating of the battery pack 10. In addition, when the first battery group 11 and the second battery group 12 alternately charge and discharge, both the first battery group 11 and the second battery group 12 are electrically connected to the winding 20, the first battery group 11 and the second battery group 12 charge and discharge each other via the winding 20, and the first battery group 11 and the second battery group 12 charge the capacitor 50, and as a result, the first battery group 11 and the second battery group 12 can supply power to the load 100, and the capacitor 50 can also supply power to the load 100.

[0086] In other words, in the embodiment of the present disclosure, the controller controls the first switch assembly 30 and the second switch assembly 40 to switch between an on state and an open state, which corresponds to the existence of an alternating current between the first battery group 11 and the second battery group 12. The alternating current can create a cross-vibration effect between the first battery group 11 and the second battery group 12, which results in the battery pack 10 generating heat, thereby avoiding the need to heat the battery pack 10 using an external heating method. In addition, heating is performed internally in the battery pack 10, which can result in a uniform temperature field distribution in the battery pack 10 and improve heating efficiency.

[0087] 20 is a flowchart of a control method according to one embodiment of the present disclosure. The control method is applied to the battery self-heating control system in any of the previous embodiments. As shown in FIG. 20, the method includes the following steps:

[0088] Step 201: controlling a first switch assembly and a second switch assembly to switch between an on state and an open state;

[0089] Step 202: Alternately charging and discharging the first group of batteries and the second group of batteries via a winding to heat the battery pack, wherein at least one of the first group of batteries, the second group of batteries, and the capacitor is configured to supply power to a load.

[0090] In an embodiment of the present disclosure, a connecting wire drawn between the first group of batteries and the second group of batteries is 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 group of batteries and the first end of the capacitor. The second switch assembly is electrically connected to the negative terminal of the second group of batteries and the second end of the capacitor. The first and second ends of the capacitor are used to connect to a load. Thus, the first and second switch assemblies can be switched between an on state and an open state, so that the first and second groups of batteries can charge or discharge each other. After the first group of batteries charges the second group of batteries, the first group of batteries can be charged via the second group of batteries, so that the current direction in the first group of batteries periodically changes and the current direction in the second group of batteries periodically changes, which corresponds to the existence of an alternating current between the first and second groups of batteries. The controller is electrically connected to the first switch assembly and the second switch assembly. The controller may control the first switch assembly and the second switch assembly to switch between an on state and an open state, which corresponds to an alternating current existing between the first group of batteries and the second group of batteries, causing the first group of batteries and the second group of batteries to alternately charge and discharge, heating the battery pack (i.e., self-heating of the battery pack). Additionally, when the first group of batteries and the second group of batteries alternately charge and discharge, both the first group of batteries and the second group of batteries are electrically connected to the winding, causing the first group of batteries and the second group of batteries to charge and discharge each other through the winding, and the first group of batteries and the second group of batteries to charge the capacitor. As a result, the first group of batteries and the second group of batteries can supply power to the load, and the capacitor can also supply power to the load.

[0091] In other words, in the embodiment of the present disclosure, the controller controls the first switch assembly and the second switch assembly to switch between an on state and an open state, which corresponds to the presence of an alternating current between the first battery group and the second battery group. The alternating current can create a cross-vibration effect between the first battery group and the second battery group, which results in the battery pack heating, thereby avoiding the need to heat the battery pack 10 using an external heating method. In addition, heating is performed internally in the battery pack, which results in a uniform temperature field distribution in the battery pack and improved heating efficiency.

[0092] Additionally, in some implementations, when the control system is in a first state, controlling the first switch assembly and the second switch assembly to switch between an on state and an open state to supply an alternating current between the first group of batteries and the second group of batteries to alternately charge and discharge the first group of batteries and the second group of batteries includes:

[0093] controlling the first switch assembly and the second switch assembly to switch between an on state and an open state within a first half of each control cycle to charge the winding, controlling the first group of batteries to charge the second group of batteries through the winding, and a capacitor, or the first group of batteries and the capacitor, configured to supply power to a load;

[0094] and controlling, within a second half of each control cycle, the first switch assembly and the second switch assembly to switch between an on state and an open state to charge the winding, and controlling the second group of batteries to charge the first group of batteries through the winding, and the capacitor, or the second group of batteries and the capacitor, configured to supply power to the load.

[0095] Additionally, in some implementations, the steps of controlling the first switch assembly and the second switch assembly to switch between an on state and an open state within a first half period of each control cycle to charge the winding, controlling the first group of batteries to charge the second group of batteries through the winding, and configuring the first group of batteries and the capacitor, or the first group of batteries and the capacitor, to supply power to the load, include:

[0096] controlling a first switch assembly to a closed state, a second switch assembly to an open state, a first battery group to charge the winding, and a capacitor to supply power to the load during a first period of a first half cycle;

[0097] and controlling the first switch assembly to an open state, controlling the second switch assembly to a closed state, controlling the winding to charge the second battery group, and controlling the first battery group and the capacitor to supply power to the load, during a second period of the first half-cycle.

[0098] Additionally, in some implementations, the steps of controlling the first switch assembly and the second switch assembly to switch between an on state and an open state within a second half period of each control cycle to charge the winding, controlling the second group of batteries to charge the first group of batteries through the winding, and the capacitor, or the second group of batteries and the capacitor, to supply power to the load, are configured to:

[0099] during a third period of the second half cycle, controlling the first switch assembly to an open state, controlling the second switch assembly to a closed state, controlling the second battery group to charge the winding, and controlling the capacitor to supply power to the load;

[0100] and during a fourth period of the first half cycle, controlling the first switch assembly to a closed state, controlling the second switch assembly to an open state, controlling the winding to charge the first group of batteries, and controlling the second group of batteries and the capacitor to supply power to the load.

[0101] Additionally, in some implementations, when the control system is in the second state, controlling the first switch assembly and the second switch assembly to switch between an on state and an open state to supply an alternating current between the first group of batteries and the second group of batteries to alternately charge and discharge the first group of batteries and the second group of batteries includes:

[0102] when the battery level of the first group of batteries is greater than the battery level of the second group of batteries, controlling the first switch assembly and the second switch assembly to switch between an on state and an open state, controlling the first switch assembly to a closed state, controlling the second switch assembly to an open state, controlling the first group of batteries to charge the winding, and controlling the first group of batteries, the second group of batteries, and the capacitor to supply power to the load, within a first period of each control cycle;

[0103] and controlling, within a second period of each control cycle, the first switch assembly to an open state, the second switch assembly to a closed state, controlling the winding to charge the second group of batteries, and controlling the first group of batteries and the second group of batteries to supply power to a capacitor and a load.

[0104] Additionally, in some implementations, when the control system is in the second state, controlling the first switch assembly and the second switch assembly to switch between an on state and an open state to supply an alternating current between the first group of batteries and the second group of batteries to alternately charge and discharge the first group of batteries and the second group of batteries includes:

[0105] When the control system is in a second state, when the battery level of the first group of batteries is greater than the battery level of the second group of batteries, within a third time period of each control cycle, controlling the first switch assembly to an open state, controlling the second switch assembly to a closed state, controlling the second group of batteries to charge the winding, and controlling the first group of batteries, the second group of batteries, and the capacitor to supply power to the load;

[0106] and controlling the first switch assembly to a closed state, controlling the second switch assembly to an open state, controlling the winding to charge the first group of batteries, and controlling the first group of batteries and the second group of batteries to supply power to a capacitor and a load within a fourth period of each control cycle.

[0107] Additionally, in some implementations, the method includes, when the second group of batteries is damaged, controlling the first switch assembly and the second switch assembly to be alternately turned on, causing the winding, the first switch assembly, the second switch assembly, and the capacitor to form a boost circuit, and the first group of batteries supplying power to the load via the boost circuit;

[0108] If the first group of batteries is damaged, the method further includes controlling the first switch assembly and the second switch assembly to be alternately turned on, causing the winding, the first switch assembly, the second switch assembly, and the capacitor to form a boost circuit, and causing the second group of batteries to supply power to the load via the boost circuit.

[0109] An embodiment of the present disclosure provides an electric vehicle including a battery self-heating control system according to any of the previous embodiments.

[0110] Additionally, in embodiments of the present disclosure, the electric vehicle may further include a charging interface, which is electrically connected to the battery pack for charging the battery pack.

[0111] The charging interface is electrically connected to the battery pack 10, so that the battery pack 10 can be charged through the charging interface. In addition, during the charging process of the battery pack 10, the first switch assembly 30 and the second switch assembly 40 can be further controlled through the controller to cause the battery pack 10 to self-heat.

[0112] It should be noted that all embodiments in this specification are progressively described, and the description of each embodiment focuses on the differences from other embodiments, and the same or similar parts of each embodiment can be mutually referenced.

[0113] Although optional embodiments of the present disclosure have been described, those skilled in the art, upon learning the basic creative concept, can make additional changes and modifications to these embodiments. Therefore, it is intended that the following claims be interpreted to encompass any embodiment and all changes and modifications that fall within the scope of the present disclosure.

[0114] Finally, it should be further noted that relational terms herein, such as "first" and "second," are used solely to distinguish one entity from another and do not require or imply an actual relationship or order between those entities. Furthermore, the terms "comprises," "having," or any variations thereof, are intended to encompass non-exclusive inclusions. Thus, an object or device containing a set of elements not only includes those elements, but also other elements not expressly named, or includes the inherent elements of the object or device. Absent further limitations, an element limited by "comprises" does not exclude other identical elements present in an article or device containing that element.

[0115] The technical solutions provided in the present disclosure have been described in detail above. The principles and implementations of the present disclosure are explained herein by using specific examples. In addition, those skilled in the art may make modifications to specific implementations and application scopes according to the principles and implementations of the present disclosure. In summary, the contents of this specification should not be interpreted as limiting the present disclosure.

Claims

1. 1. A battery self-heating control system comprising: a battery pack; a winding; a first switch assembly; a second switch assembly; a capacitor; and a controller; the battery pack includes a first battery group and a second battery group connected in series, a connecting wire is drawn between the first battery group and the second battery group, and the connecting wire is 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 group of batteries and a first end of the capacitor, the second switch assembly is electrically connected to the negative terminal of the second group of batteries and a second end of the capacitor, the first end and the second end of the capacitor are used to connect to a load, and the other end of the winding is connected between the first switch assembly and the second switch assembly; the controller is electrically connected to the first switch assembly and the second switch assembly, the controller is configured to control the first switch assembly and the second switch assembly to switch between an on state and an open state to cause the first group of batteries and the second group of batteries to alternately charge and discharge through the winding to heat the battery pack, and at least one of the first group of batteries, the second group of batteries, and the capacitor is configured to supply power to the load.

2. When the control system is in a first state, within a first half period of each control cycle of the controller, the controller is configured to control the first switch assembly and the second switch assembly to switch between the on state and the open state to charge the winding and to control the first group of batteries to charge the second group of batteries via the winding, and the capacitor and / or the first group of batteries are configured to supply power to the load; 2. The battery self-heating control system of claim 1, wherein within a second half period of each control cycle of the controller, the controller controls the first switch assembly and the second switch assembly to switch between the on state and the open state to charge the winding and controls the second group of batteries to charge the first group of batteries through the winding, and the capacitor and / or the second group of batteries are configured to supply power to the load.

3. During a first period of the first half-cycle, the controller controls the first switch assembly to a closed state, controls the second switch assembly to the open state, controls the first battery group to charge the winding, and controls the capacitor to supply power to the load; 3. The battery self-heating control system of claim 2, wherein during a second period of the first half-cycle, the controller controls the first switch assembly to the open state, controls the second switch assembly to the closed state, controls the winding to charge the second group of batteries, and controls the first group of batteries and the capacitor to supply power to the load.

4. During a third period of the second half-cycle, the controller controls the first switch assembly to an open state, controls the second switch assembly to the closed state, controls the second battery group to charge the winding, and controls the capacitor to supply power to the load; 4. The battery self-heating control system of claim 2, wherein during a fourth period of the second half cycle, the controller controls the first switch assembly to the closed state, controls the second switch assembly to the open state, controls the winding to charge the first group of batteries, and controls the second group of batteries and the capacitor to supply power to the load.

5. When the control system is in a second state, a battery level of the first group of batteries is greater than a battery level of the second group of batteries, and during the first period of each control cycle, the controller controls the first switch assembly and the second switch assembly to switch between the on state and the open state, controls the first switch assembly to the closed state, controls the second switch assembly to the open state, controls the first group of batteries to charge the winding, and controls the first group of batteries, the second group of batteries, and the capacitor to supply power to the load; 5. The battery self-heating control system of claim 1, wherein, within the second period of each control cycle, the controller controls the first switch assembly to the open state, controls the second switch assembly to a closed state, controls the winding to charge the second group of batteries, and controls the first group of batteries and the second group of batteries to supply power to the capacitor and the load.

6. When the control system is in the second state, a battery level of the first group of batteries is greater than a battery level of the second group of batteries, and during the third period of each control cycle, the controller controls the first switch assembly to the open state, controls the second switch assembly to the closed state, controls the second group of batteries to charge the winding, and controls the first group of batteries, the second group of batteries, and the capacitor to supply power to the load; 6. The battery self-heating control system of claim 1, wherein, within the fourth period of each control cycle, the controller controls the first switch assembly to the closed state, controls the second switch assembly to the open state, controls the winding to charge the first group of batteries, and controls the first group of batteries and the second group of batteries to supply power to the capacitor and the load.

7. When the second battery group is damaged, the controller controls the first switch assembly and the second switch assembly to be alternately turned on, causing the winding, the first switch assembly, the second switch assembly, and the capacitor to form a boost circuit, and the first battery group supplies power to the load via the boost circuit; 7. The battery self-heating control system according to claim 1, wherein, when the first group of batteries is damaged, the controller controls the first switch assembly and the second switch assembly to be alternately turned on, causing the winding, the first switch assembly, the second switch assembly, and the capacitor to form a boost circuit, and the second group of batteries supplies power to the load via the boost circuit.

8. a switch device is disposed on the connecting line, the switch device is electrically connected to the controller, and the controller is configured to control the switch device to be in the on state or the open state; When the switch device is in the on state, the battery pack supplies power to the load and self-heats; The battery self-heating control system according to claim 1 , wherein when the switch device is in the open state, the battery pack only supplies power to the load.

9. A control method comprising: controlling the first switch assembly and the second switch assembly to switch between an on state and an open state; alternately charging and discharging the first group of batteries and the second group of batteries through a winding to heat the battery pack, and at least one of the first group of batteries, the second group of batteries, and a capacitor configured to supply power to a load; A control method comprising:

10. An electric vehicle comprising a battery self-heating control system according to any one of claims 1 to 8.

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