Battery self-heating control system and control method, and electric transport means

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, the entire content of which is incorporated herein by reference.

[0002] This disclosure relates to the technical field of battery self - heating control systems, specifically to battery self - heating control systems and control methods, as well as electric transportation means.

Background Art

[0003] With the development of science and technology, electric transportation means are becoming the main means of transportation for people to move around daily. For example, electric vehicles are gradually becoming mainstream. Generally, a battery pack is arranged in an electric transportation means, and the battery pack supplies power to the load in the electric transportation means. 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 a limitation of the output power during driving.

[0004] In related technologies, 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, the switch inside the battery heater is turned on. As a result, the resistor of the battery heater is energized and generates heat, and the generated heat flows through the air flow path or the water flow path to the battery pack to heat the battery pack.

[0005] Due to the long piping of the air flow path and the water flow path, the heat loss is large. As a result, the heating speed of the battery pack is slow, the heating time is long, and the heating effect is affected.

Summary of the Invention

Means for Solving the Problems

[0006] Embodiments of this disclosure provide a battery self-heating control system that solves the problems of related technologies in which a battery pack has a slow heating rate and long heating time due to large heat loss caused by long piping of air or water channels, and in addition, the heating effect is affected due to the non-uniform temperature field distribution of the battery pack when it is heated through the air or water channels.

[0007] To resolve the technical issues described above, this disclosure is implemented as follows:

[0008] Embodiments of the present disclosure provide a battery self-heating control system. The control system includes a battery pack, windings, 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 and second battery groups. The connecting wire is connected to one end of a winding.

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

[0011] The controller is electrically connected to the first switch assembly and the second switch assembly. The controller is configured to control the first and second switch assemblies to switch between an on state and an open state, thereby heating the battery pack by alternately charging and discharging the first and second battery groups via windings. At least one of the first battery group, the second battery group, and the capacitor is configured to supply power to the load.

[0012] Optionally, when the control system is in a first state, within a first half-cycle of each control cycle of the controller, the controller is configured to control the first battery group to switch the first and second switch assemblies between the ON and OFF states, charge the windings, and charge the second battery group through the windings. The capacitors and / or the first battery group are configured to supply power to the load.

[0013] Within the second half-cycle of each control cycle of the controller, the controller is configured to control the first and second switch assemblies to switch between the ON and OFF states, charge the windings, and control the second battery group to charge the first battery group via the windings. The capacitors and / or the second battery group are configured to supply power to the load.

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

[0015] Within the second period of the first half-cycle, the controller controls the first switch assembly to be open, the second switch assembly to be closed, the windings to charge the second battery group, and the first battery group and capacitors to supply power to the load.

[0016] Optionally, within the third period of the second half-cycle, the controller controls the first switch assembly to be open, the second switch assembly to be closed, the second battery group to charge the windings, and the capacitor to supply power to the load.

[0017] Within the fourth period of the second half-cycle, the controller controls the first switch assembly to be closed, the second switch assembly to be open, the windings to charge the first battery group, and the second battery group and capacitors to supply power to the load.

[0018] Optionally, when the control system is in a second state, the battery level of the first battery group is greater than the battery level of the second battery group. During the first period of each control cycle, the controller controls the first and second switch assemblies to switch between the ON and OFF states, controls the first switch assembly to a closed state, controls the second switch assembly to an OFF state, controls the first battery group to charge the windings, and controls the first battery group, the second battery group, and the capacitor to supply power to the load.

[0019] During the second period of each control cycle, the controller controls the first switch assembly to be open, the second switch assembly to be closed, the windings to charge the second battery group, and the first and second battery groups to supply power to the capacitor and load.

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

[0021] During the fourth period of each control cycle, the controller controls the first switch assembly to be closed, controls the second switch assembly to be open, controls the winding to charge the first battery bank, and controls the first and second battery banks to supply power to the capacitor and the load.

[0022] Optionally, if the second battery bank is damaged, the controller controls the first and second switch assemblies to be alternately turned on to form a boost circuit with the winding, the first switch assembly, the second switch assembly, and the capacitor. The first battery bank supplies power to the load via the boost circuit.

[0023] If the first battery bank is damaged, the controller controls the first and second switch assemblies to be alternately turned on to form a boost circuit with the winding, the first switch assembly, the second switch assembly, and the capacitor. The second battery bank supplies power to the load via the boost circuit.

[0024] Optionally, a switch device is disposed on the connection line. The switch device is electrically connected to the controller. The controller is configured to control the switch device to be turned on or open.

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

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

[0027] According to a second aspect, an embodiment of the present disclosure includes controlling the first and second switch assemblies to switch between an on state and an open state, and Providing a control method including steps of alternately charging and discharging a first battery group and a second battery group through a winding to heat a battery pack, and configuring at least one of the first battery group, the second battery group, and 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 battery group and the second battery group, and causing the first battery group and the second battery group to be alternately charged and discharged, the steps are Within a first half cycle of each control cycle, controlling the first switch assembly and the second switch assembly to switch between an on state and an open state, charging the winding, controlling the first battery group to charge the second battery group through the winding, and configuring the capacitor, or the first battery group and the capacitor to supply power to the load; Within a second half cycle of each control cycle, controlling the first switch assembly and the second switch assembly to switch between an on state and an open state, charging the winding, controlling the second battery group to charge the first battery group through the winding, and configuring the capacitor, or the second battery group and the capacitor to supply power to the load.

[0029] Optionally, within a first half cycle of each control cycle, controlling the first switch assembly and the second switch assembly to switch between a controlled on state and an open state, charging the winding, controlling the first battery group to charge the second battery group through the winding, and configuring the capacitor, or the first battery group and the capacitor to supply power to the load, the steps are Within a first period of the first half cycle, controlling the first switch assembly to be in a closed state, controlling the second switch assembly to be in an open state, controlling the first battery group to charge the winding, and controlling the capacitor to supply power to the load; The steps include controlling a first switch assembly to be in an open state, controlling a second switch assembly to be in a closed state, controlling the windings to charge a second battery group, and controlling the first battery group and capacitor to supply power to a load, within a second period of a first half-cycle.

[0030] The steps include optionally controlling the first and second switch assemblies to switch between an ON state and an OFF state within a second half-cycle of each control cycle, charging the windings, controlling the second battery group to charge the first battery group via the windings, and configuring the capacitor, or the second battery group and capacitor, to supply power to the load, The steps include controlling the first switch assembly to be in an open state, controlling the second switch assembly to be in a closed state, controlling the second battery group to charge the windings, and controlling the capacitor to supply power to the load, within the third period of the second half-cycle. The steps include controlling a first switch assembly to a closed state, controlling a second switch assembly to an open state, controlling the windings to charge a first battery group, and controlling a second battery group and a capacitor to supply power to a load, all within a fourth period of a first half-cycle.

[0031] The step of optionally controlling the control system to switch between the ON and OFF states of the first and second switch assemblies when the control system is in the second state, thereby supplying alternating current between the first and second battery groups and causing the first and second battery groups to alternately charge and discharge, is as follows: When the battery level of the first battery group is greater than the battery level of the second battery group, the first control cycle includes controlling the first switch assembly and the second switch assembly to switch between the ON and OFF states, controlling the first switch assembly to the OFF state, controlling the second switch assembly to the OFF state, controlling the first battery group to charge the windings, and controlling the first battery group, the second battery group, and the capacitor to supply power to the load. The process includes, within a second period of each control cycle, controlling the first switch assembly to be open, controlling the second switch assembly to be closed, controlling the windings to charge the second battery group, and controlling the first and second battery groups to supply power to the capacitor and load.

[0032] The step of optionally controlling the first and second switch assemblies to switch between the ON and OFF states when the control system is in the second state, thereby supplying alternating current between the first and second battery groups and causing the first and second battery groups to alternately charge and discharge, is as follows: When the control system is in a second state, and the battery level of the first battery group is greater than the battery level of the second battery group, the steps of controlling the first switch assembly to be open, the second switch assembly to be closed, the second battery group to charge the windings, and the first battery group, the second battery group, and the capacitor to supply power to the load, within a third period of each control cycle, The further steps include, within a fourth period of each control cycle, controlling the first switch assembly to a closed state, controlling the second switch assembly to an open state, controlling the windings to charge the first battery group, and controlling the first and second battery groups to supply power to the capacitor and load.

[0033] Optionally, the method includes the steps of: controlling the first and second switch assemblies to alternately turn on when the second battery group is damaged, causing the windings, first switch assembly, second switch assembly, and capacitor to form a boost circuit, and the first battery group supplying power to the load via the boost circuit; The further step includes, if the first battery group is damaged, controlling the first switch assembly and the second switch assembly to alternately turn on, causing the windings, the first switch assembly, the second switch assembly, and the capacitor to form a boost circuit, and the second battery group to supply power to the load via the boost circuit.

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

[0035] In embodiments of this disclosure, a connecting wire drawn between the first battery group and the second battery group is connected to one end of a 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 group and the first end of the capacitor. The second switch assembly is electrically connected to the negative terminal of the second battery group 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 may be switched between an ON state and an OFF state, and as a result, the first and second battery groups may charge or discharge each other. After the first battery group has charged the second battery group, the first battery group may be charged through the second battery group, and as a result, the current direction of the first battery group changes periodically, and the current direction of the second battery group changes periodically, which corresponds to the presence of alternating current between the first and second battery groups. The controller is electrically connected to the first switch assembly and the second switch assembly. Therefore, the controller may control the first switch assembly and the second switch assembly to switch between an ON state and an OFF state, which corresponds to the presence of an alternating current between the first and second battery groups, causing the first and second battery groups to alternately charge and discharge, thereby heating the battery pack, i.e., self-heating of the battery pack. In addition, when the first and second battery groups alternately charge and discharge, both the first and second battery groups are electrically connected to the windings, and the first and second battery groups charge and discharge each other via the windings, charging the capacitor, and as a result, the first and second battery groups can supply power to the load, and the capacitor can also supply power to the load.

[0036] In other words, in the embodiments of this disclosure, the controller controls the first and second switch assemblies to switch between an ON state and an OFF state, which results in the presence of an AC current between the first and second battery groups. The AC current can cause the effect of confounding oscillations between the first and second battery groups, resulting in the battery pack generating heat, thus avoiding the need to heat the battery pack using an external heating method. In addition, heating occurs inside the battery pack, which results in a uniform temperature field distribution and improved heating efficiency. [Brief explanation of the drawing]

[0037] [Figure 1] This is a schematic diagram 1 of a battery self-heating control system according to one embodiment of the present disclosure. [Figure 2] This is a schematic diagram 2 of a battery self-heating control system according to one embodiment of the present disclosure. [Figure 3] Figure 3 is a schematic diagram of a battery self-heating control system according to one embodiment of the present disclosure. [Figure 4] This is a schematic diagram 1 showing the current flow direction in a first state according to one embodiment of the present disclosure. [Figure 5] This is a schematic diagram 2 showing the current flow direction in a first state according to one embodiment of the present disclosure. [Figure 6] Figure 3 is a schematic diagram of the current flow direction in a first state according to one embodiment of the present disclosure. [Figure 7] Figure 4 is a schematic diagram of the current flow direction in a first state according to one embodiment of the present disclosure. [Figure 8] This is a schematic diagram 1 showing the current flow direction in a second state according to one embodiment of the present disclosure. [Figure 9] This is a schematic diagram 2 showing the current flow direction in a second state according to one embodiment of the present disclosure. [Figure 10] This is a schematic diagram 3 showing the current flow direction in a second state according to one embodiment of the present disclosure. [Figure 11] Figure 4 is a schematic diagram of the current flow direction in a second state according to one embodiment of the present disclosure. [Figure 12] This is a schematic diagram 1 showing the current flow direction in a third state according to one embodiment of the present disclosure. [Figure 13] This is a schematic diagram 2 showing the current flow direction in a third state according to one embodiment of the present disclosure. [Figure 14] This is a schematic diagram 3 showing the current flow direction in a third state according to one embodiment of the present disclosure. [Figure 15] Figure 4 is a schematic diagram of the current flow direction in a third state according to one embodiment of the present disclosure. [Figure 16] This is a schematic diagram 1 showing the current flow direction when the second battery group is damaged, according to one embodiment of the present disclosure. [Figure 17] This is a schematic diagram 2 showing the direction of current flow when the second battery group is damaged, according to one embodiment of the present disclosure. [Figure 18] This is a schematic diagram 1 showing the current flow direction when the first battery group is damaged, according to one embodiment of the present disclosure. [Figure 19] This is a schematic diagram 2 showing the direction of current flow when the first battery group is damaged, according to one embodiment of the present disclosure. [Figure 20] This 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 devices 11: First battery group 12: Second battery group 100: Load 101: Electric motor controller: 102: Other high-voltage loads [Modes for carrying out the invention]

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

[0040] It should be understood that any “certain embodiment” or “one embodiment” referred to throughout this specification means that certain features, structures, or characteristics related to an embodiment are included in at least one embodiment of this disclosure. Therefore, any “in certain embodiment” or “one embodiment” appearing throughout this specification does not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0041] As shown in Figure 1, the battery self-heating control system includes a battery pack 10, windings 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 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 the 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 and second ends 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. The 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 OFF state, and to heat the battery pack 10 by causing the first battery group 11 and the second battery group 12 to alternately charge and discharge via the winding 20. At least one of the first battery group 11, the second battery group 12, and the capacitor 50 is configured to supply power to the load.

[0043] In embodiments of this disclosure, a 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 the 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 and second ends of the capacitor 50 are used to connect to the load 100. Thus, the first switch assembly 30 and the second switch assembly 40 may be switched between an ON state and an OFF state, and as a result, the first battery group 11 and the second battery group 12 can be charged or discharged from 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. As a result, the current direction of the first battery group 11 changes periodically, and the current direction of the second battery group 12 changes periodically. This corresponds to the presence of alternating current 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. Therefore, the controller controls the first switch assembly 30 and the second switch assembly 40 to switch between an on state and an open state. This corresponds to the presence of alternating current 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, thereby 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 are charged and discharged alternately, both the first battery group 11 and the second battery group 12 are electrically connected to the winding 20, and the first battery group 11 and the second battery group 12 charge and discharge each other via the winding 20, 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 embodiments of this disclosure, the controller controls the first switch assembly 30 and the second switch assembly 40 to switch between an ON state and an OFF state, which results in the presence of an AC current between the first battery group 11 and the second battery group 12. The AC current can cause the effect of confounding oscillations between the first battery group 11 and the second battery group 12, resulting in the battery pack 10 generating heat, thus avoiding the need to heat the battery pack 10 using an external heating method. In addition, heating occurs inside the battery pack 10, which results in a uniform temperature field distribution within the battery pack 10 and improves 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 the 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 the 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, and as a result, the current direction of the first battery group 11 is alternately switched. This is equivalent to the first battery group 11 having an alternating current, and as a result, the first battery group 11 can self-heat. For details on the self-heating of the second battery group 12, please refer to the self-heating process of the first battery group 11, and the details will not be repeated here.

[0046] It should be further noted that in embodiments of this disclosure, the winding 20 may also be an inductor. When the control system is used in an electric transport means, the electric transport means includes an electric motor, and the winding 20 of the electric motor may be used as the winding 20 in the control system, i.e., the battery pack 10 is electrically connected to the winding 20 of the electric motor. In addition, the winding 20 may alternatively be another component specifically configured to store energy, or alternatively, a component configured to carry and transmit energy via alternating current.

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

[0048] In addition, in embodiments 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 be of other types instead. For example, the first switch assembly 30 and the second switch assembly 40 may be other thyristors instead. In addition, in embodiments of the present disclosure, when the control system is used in an electric transport system, the bridge arms of an electric motor controller in the electric transport system may be used as the first switch assembly 30 and the second switch assembly 40, as shown in Figure 3, i.e., the battery pack 10 is electrically connected to the bridge arms of the electric motor controller.

[0049] In addition, in embodiments of this disclosure, the capacitor 50 may be an additional, independent capacitor 50. When the control system is used in an electric transport means, the capacitor 50 may alternatively be integrated with an electric motor controller 101 in the electric transport means, or the capacitor 50 may alternatively be integrated with another high-voltage load 102 in the electric transport means. Indeed, the capacitor 50 may alternatively not be integrated with the electric motor controller 101 or other high-voltage load 102. This is not limited to embodiments of this disclosure.

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

[0051] In addition, in the embodiments of this disclosure, 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 OFF state, and when the first switch assembly 30 is in the OFF state, the second switch assembly 40 is in the ON state.

[0052] In addition, in embodiments of this disclosure, the first battery group 11 and the second battery group 12 may both be independent battery packs 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 centerline of the battery pack 10 is drawn out. In addition, 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 be the same or different. This is not limited to embodiments of this disclosure.

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

[0054] When the control system is in a first state, the controller's control cycles consist of several cycles. Within each control cycle, within the first half-cycle 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 OFF 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, and the second battery group 12 charges through the winding 20. Also, 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. Within the second half-cycle 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. 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, the second battery group 12 charges the winding 20, and charges the first battery group 11 through the winding 20. Also, 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-period may include a first period and a second period, the second half-period may include a third period and a fourth period, the first and second periods form a complete first half-period, and the third and fourth periods form a complete second half-period.

[0056] During the 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 the 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 Figure 4, during the first period, when the first switch assembly 30 is controlled to be closed and the second switch assembly 40 is controlled to be open, in this case the voltage of the first battery group 11 is greater than the voltage of the second battery group 12, the first battery group 11 charges the winding 20, and as a result the winding 20 can store electrical energy, and the electrical energy stored in the capacitor 50 is used to supply power to the load 100. As shown in Figure 5, during the second period, when the first switch assembly 30 is open and the second switch assembly 40 is closed, in this case it corresponds to the first battery group 11 being connected in series with the winding 20, and as a result the first battery group 11 and the winding 20 jointly supply power to the load 100, and the winding 20 charging the second battery group 12. When the controller controls the first switch assembly 30 to cycle through the state within a first period and a second period, and controls the second switch assembly 40 to cycle through the state within a first period and a second period, this corresponds to the first switch assembly 30, the second switch assembly 40, the winding 20, and the capacitor 50 forming a boost circuit, which in turn means 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 the third period of the second half-cycle, the controller controls the first switch assembly to be open, the second switch assembly to be closed, the second battery group to charge the windings, and the capacitor to supply power to the load. During the fourth period of the second half-cycle, the controller controls the first switch assembly to be closed, the second switch assembly to be open, the windings to charge the first battery group, and the second battery group and capacitor to supply power to the load.

[0059] During the third 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 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. As shown in Figure 6, during the third period, when the first switch assembly 30 is in the open state and the second switch assembly 40 is in the closed state, in this case, after the first battery group 11 has been 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, and as a result the winding 20 can store electrical energy, and the electrical energy stored in the capacitor 50 is used to supply power to the load 100. As shown in Figure 7, when the first switch assembly 30 is closed and the second switch assembly 40 is open during the fourth period, this corresponds to the second battery group 12 being connected in series with the winding 20, resulting in the second battery group 12 and the winding 20 jointly supplying power to the load 100, and the winding 20 charging the first battery group 11. When the controller controls the first switch assembly 30 to cycle through its state within a third and fourth period, and controls the second switch assembly 40 to cycle through its state within a third and fourth period, this corresponds to the first switch assembly 30, the second switch assembly 40, the winding 20, and the capacitor 50 forming a boost circuit, which in turn means that the second battery group 12 supplies power to the load 100 via the boost circuit, the second battery group 12 continuously discharges to 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 in several control cycles, this corresponds to each control cycle being cyclical, that is, the states of the first switch assembly 30 and the second switch assembly 40 cyclically within the control cycle, and as a result, the first battery group 11 and the second battery group 12 alternately charge and discharge. Specifically, within the first and second periods of the first half-cycle of each control cycle, the first battery group 11 discharges to the second battery group 12, and the second battery group 12 is charged. Within the third and fourth periods of the second half-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 is equivalent 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] In addition, when the controller's control cycle is repeated, that is, 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. Within one control cycle, in the fourth period of the previous control cycle, the second battery group 12 charges the first battery group 11, and as a result, the voltage of the first battery group 11 becomes greater than the voltage of the second battery group 12. After the cycle, in the first period of the current control cycle, the first battery group 11 charges the second battery group 12, 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 preceding the second control cycle. During the fourth period of the first control cycle, the second battery group 12 charges the first battery group 11, and as a result, the voltage of the first battery group 11 becomes greater than the voltage of the second battery group 12. Next, the first period of the second control cycle begins, and the first battery group 11 charges the second battery group 12.

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

[0064] In addition, in embodiments of this disclosure, when the control system is used in an electric transport means, the first state may be a state in which the electric transport means is in a self-heating state while running, i.e., the first state is a self-heating state while running. This corresponds to the battery pack 10 self-heating while running, i.e., while the electric transport means is moving.

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

[0066] When the control system is used in an electric transport system, the second state may be a balanced state, that is, the battery levels of the first battery group 11 and the second battery group 12 may be balanced. For example, if the battery levels of the first battery group 11 and the second battery group 12 are different during operation, the balancing function may be activated, and as a result the electric transport system will be in a balanced state.

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

[0068] Note that the first and second periods may form a control cycle, and the first and second periods may alternately repeat, resulting in the first battery group 11 continuously discharging into the second battery group 12, until 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] In addition, as shown in Figure 10, if the battery level of the second battery group 12 is greater than the battery level of the first battery group 11, during the third period, the controller controls the first switch assembly 30 to be open and the second switch assembly 40 to be closed. In this case, the second battery group 12 is connected in series with the second switch assembly 40 and charges the winding 20 via the second switch assembly 40. In addition, 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 Figure 11, during the fourth period, the controller controls the first switch assembly 30 to be closed and the second switch assembly 40 to be open. In this case, the winding 20 and the first battery group 11 form a complete path through the first switch assembly 30, and the winding 20 charges the first battery group 11. In addition, the first battery group 11 is connected in series with the second battery group 12, and the first battery group 11 and the second battery group 12 supply power to the load 100 and charge the capacitor 50.

[0070] It should be noted that the third and fourth periods may form a control cycle, and the third and fourth periods may alternately repeat, resulting in the second battery group 12 continuously discharging into the first battery group 11, until 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 embodiments of the present disclosure, if the battery level of the first battery group 11 is greater than the battery level of the second battery group 12, the controller alternately and periodically controls the first switch assembly 30 and the second switch assembly 40 during the first and second periods, 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. If the battery level of the second battery group 12 is greater than the battery level of the first battery group 11, the controller alternately and periodically controls the first switch assembly 30 and the second switch assembly 40 during the third and fourth periods, 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] In addition, in some embodiments, as shown in Figures 12 to 15, when the control system is in the third state, within each control cycle of the controller, during the 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 battery group 11 to charge the winding 20. During the 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 battery group 12. During the 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 battery group 12 to charge the winding 20. During the 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 battery group 11.

[0073] When the control system is used in an electric transport system, the third state may be a parking heating state, that is, a state in which the electric transport system has stopped moving and the battery pack 10 is self-heating. For example, if the electric transport system 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] In addition, when the control system is in the first state, the controller's control cycle includes several cycles. Within each control cycle, during the first period, the controller controls the first switch assembly 30 to a closed state and the second switch assembly 40 to an open state. During the second period, the controller controls the first switch assembly 30 to an open state and the second switch assembly 40 to a closed state. As shown in Figure 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, in this case the voltage of the first battery group 11 is greater than the voltage of the second battery group 12, and the first battery group 11 charges the winding 20, and as a result the winding 20 can store electrical energy. As shown in Figure 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, the winding 20 and the second battery group 12 form a complete path through the second switch assembly 40, and the winding 20 charges the second battery group 12. When the controller controls the first switch assembly 30 to cycle through the state within a first period and a second period, and controls the second switch assembly 40 to cycle through the state within a first period and a second period, the first battery group 11 continuously discharges to the second battery group 12, and the second battery group 12 continuously charges.

[0075] During the third 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 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. As shown in Figure 14, during the third period, when the first switch assembly 30 is in the open state and the second switch assembly 40 is in the closed state, in this case, after the first battery group 11 has been 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, and as a result the winding 20 can store electrical energy, and the electrical energy stored in the capacitor 50 is used to supply power to the load 100. As shown in Figure 15, during the fourth period, the first switch assembly 30 is in the closed state and the second switch assembly 40 is in the open state. In this case, the winding 20 and the first battery group 11 form a complete path through the first switch assembly 30, and the winding 20 charges the first battery group 11. If the controller controls the first switch assembly 30 to cycle through the state within the third and fourth periods, and controls the second switch assembly 40 to cycle through the state within the third and fourth periods, the second battery group 12 continuously discharges to the first battery group 11, and the first battery group 11 continuously charges.

[0076] When the controller controls the first switch assembly 30 and the second switch assembly 40 in several control cycles, this corresponds to each control cycle being cyclical, that is, the states of the first switch assembly 30 and the second switch assembly 40 cyclically within the control cycle, resulting in the first battery group 11 and the second battery group 12 alternating between charging and discharging. Specifically, within 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. Within the third and fourth periods, 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 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.

[0077] In addition, when the controller's control cycle is repeated, that is, 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. Within one control cycle, in the fourth period of the previous control cycle, the second battery group 12 charges the first battery group 11, and as a result, the voltage of the first battery group 11 becomes greater than the voltage of the second battery group 12. After the cycle, in the first period of the current control cycle, the first battery group 11 charges the second battery group 12, 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 preceding the second control cycle. During the fourth period of the first control cycle, the second battery group 12 charges the first battery group 11, and as a result, the voltage of the first battery group 11 becomes greater than the voltage of the second battery group 12. Next, the first period of the second control cycle begins, and the first battery group 11 charges itself.

[0079] In addition, in some embodiments shown in Figures 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 alternately turn 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 alternately turn on, causing the winding 20, the first switch assembly 30, the second switch assembly 40, and the capacitor 50 to 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, in this case the second battery group 12 will not be able to supply power to the load 100, and only the first battery group 11 will supply power to the load 100. The controller controls the first switch assembly 30 and the second switch assembly 40 to alternately turn on. As shown in Figure 16, during the first period, the first switch assembly 30 is closed and the second switch assembly 40 is on, the first battery group 11 charges the winding 20 via 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 Figure 17, during the second period, the first switch assembly 30 is open and the second switch assembly 40 is on, 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. In other words, the first switch assembly 30 is switched between an ON state and an OFF state, and the second switch assembly 40 is switched between an ON state and an OFF 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. As a result, the winding 20, the first switch assembly 30, the second switch assembly 40, and the capacitor 50 can form a boost circuit, which can boost the voltage of the first battery group 11 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, then the first battery group 11 will not be able to supply power to the load 100, and only the second battery group 12 will supply power to the load 100. The controller controls the first switch assembly 30 and the second switch assembly 40 to alternately turn on. As shown in Figure 18, during the third period, the first switch assembly 30 is open and the second switch assembly 40 is on, the second battery group 12 charges the winding 20 via 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 Figure 19, during the fourth period, the first switch assembly 30 is on and the second switch assembly 40 is open, 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. In other words, the first switch assembly 30 is switched between an ON state and an OFF state, and the second switch assembly 40 is switched between an ON state and an OFF 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. As a result, the winding 20, the first switch assembly 30, the second switch assembly 40, and the capacitor 50 can form a boost circuit, which can boost the voltage of the second battery group 12 to meet the voltage required by the load 100, that is, the second battery group 12 supplies power to the load 100.

[0082] In addition, in some embodiments, a switch device 60 is positioned on the connection line, as shown in Figure 2 or Figure 3. The switch device 60 is electrically connected to a controller. The controller is configured to control the switch device 60 to an ON or OFF state. When the switch device 60 is ON, the battery pack 10 supplies power to the load 100 and performs self-heating. When the switch device 60 is OFF, the battery pack 10 only supplies power to the load 100.

[0083] When the switch device 60 is located on the connection line and is electrically connected to the controller, in this case, as shown in Figure 2, when the battery pack 10 simply needs to supply power to the load 100, the controller controls the switch device 60 to the 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 the ON state, and controls the first switch assembly 30 and the second switch assembly 40 to be switched alternately 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 located on the connection line, and as a result, functional versatility of the control system can be achieved.

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

[0085] In embodiments of this disclosure, a 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 the 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 and second ends of the capacitor 50 are used to connect to the load 100. Thus, the first switch assembly 30 and the second switch assembly 40 may be switched between an ON state and an OFF state, and as a result, the first battery group 11 and the second battery group 12 can be charged or discharged from 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. As a result, the current direction of the first battery group 11 changes periodically, and the current direction of the second battery group 12 changes periodically. This corresponds to the presence of alternating current 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. Therefore, the controller controls the first switch assembly 30 and the second switch assembly 40 to switch between an on state and an open state. This corresponds to the presence of alternating current 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, thereby 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 are charged and discharged alternately, both the first battery group 11 and the second battery group 12 are electrically connected to the winding 20, and the first battery group 11 and the second battery group 12 charge and discharge each other via the winding 20, 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 embodiments of this disclosure, the controller controls the first switch assembly 30 and the second switch assembly 40 to switch between an ON state and an OFF state, which results in the presence of an AC current between the first battery group 11 and the second battery group 12. The AC current can cause the effect of confounding oscillations between the first battery group 11 and the second battery group 12, resulting in the battery pack 10 generating heat, thus avoiding the need to heat the battery pack 10 using an external heating method. In addition, heating occurs inside the battery pack 10, which results in a uniform temperature field distribution within the battery pack 10 and improves heating efficiency.

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

[0088] Step 201: A step of controlling the first switch assembly and the second switch assembly to switch between the ON state and the OFF state.

[0089] Step 202: The battery pack is heated by alternately charging and discharging the first battery group and the second battery group via windings, and is configured such that at least one of the first battery group, the second battery group, and the capacitor supplies power to the load.

[0090] In embodiments of this disclosure, a connecting wire drawn between the first battery group and the second battery group is connected to one end of a 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 group and the first end of the capacitor. The second switch assembly is electrically connected to the negative terminal of the second battery group 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 may be switched between an ON state and an OFF state, and as a result, the first and second battery groups may charge or discharge each other. After the first battery group has charged the second battery group, the first battery group may be charged through the second battery group, and as a result, the current direction of the first battery group changes periodically, and the current direction of the second battery group changes periodically, which corresponds to the presence of alternating current between the first and second battery groups. The controller is electrically connected to the first switch assembly and the second switch assembly. Therefore, the controller may control the first switch assembly and the second switch assembly to switch between an ON state and an OFF state, which corresponds to the presence of an alternating current between the first and second battery groups, causing the first and second battery groups to alternately charge and discharge, thereby heating the battery pack, i.e., self-heating of the battery pack. In addition, when the first and second battery groups alternately charge and discharge, both the first and second battery groups are electrically connected to the windings, and the first and second battery groups charge and discharge each other via the windings, charging the capacitor, and as a result, the first and second battery groups can supply power to the load, and the capacitor can also supply power to the load.

[0091] In other words, in the embodiments of this disclosure, the controller controls the first switch assembly and the second switch assembly to switch between an ON state and an OFF state, which results in the presence of an alternating current between the first battery group and the second battery group. The alternating current can cause the effect of confounding oscillations between the first battery group and the second battery group, resulting in the battery pack generating heat, thus avoiding the need to heat the battery pack 10 by an external heating method. In addition, heating occurs inside the battery pack, which results in a uniform temperature field distribution in the battery pack and improves heating efficiency.

[0092] In addition, in some implementations, when the control system is in a first state, the first switch assembly and the second switch assembly are controlled to switch between an on state and an open state, thereby supplying alternating current between the first battery group and the second battery group, and causing the first battery group and the second battery group to alternately charge and discharge.

[0093] Within the first half-cycle of each control cycle, the first switch assembly and the second switch assembly are controlled to switch between an ON state and an OFF state, the windings are charged, the first battery group is controlled to charge the second battery group via the windings, and the capacitor, or the first battery group and capacitor, are configured to supply power to the load.

[0094] Within a second half-cycle of each control cycle, the steps include controlling the first switch assembly and the second switch assembly to switch between an ON state and an OFF state, charging the windings, controlling the second battery group to charge the first battery group via the windings, and configuring the capacitor, or the second battery group and capacitor, to supply power to a load.

[0095] In addition, in some implementations, within the first half-cycle of each control cycle, the first switch assembly and the second switch assembly are controlled to switch between the ON and OFF states, the windings are charged, the first battery group is controlled to charge the second battery group via the windings, and the capacitor, or the first battery group and capacitor, are configured to supply power to the load.

[0096] The steps include controlling a first switch assembly to be in a closed state, controlling a second switch assembly to be in an open state, controlling a first battery group to charge the windings, and controlling a capacitor to supply power to a load, within a first period of a first half-cycle.

[0097] The steps include controlling a first switch assembly to be in an open state, controlling a second switch assembly to be in a closed state, controlling the windings to charge a second battery group, and controlling the first battery group and capacitor to supply power to a load, within a second period of a first half-cycle.

[0098] In addition, in some implementations, within a second half-cycle of each control cycle, the first and second switch assemblies are controlled to switch between an ON state and an OFF state, the windings are charged, the second battery group is controlled to charge the first battery group via the windings, and the capacitor, or the second battery group and capacitor, are configured to supply power to the load.

[0099] The steps include controlling the first switch assembly to be in an open state, controlling the second switch assembly to be in a closed state, controlling the second battery group to charge the windings, and controlling the capacitor to supply power to the load, within the third period of the second half-cycle.

[0100] The steps include controlling a first switch assembly to a closed state, controlling a second switch assembly to an open state, controlling the windings to charge a first battery group, and controlling a second battery group and a capacitor to supply power to a load, all within a fourth period of a first half-cycle.

[0101] In addition, in some implementations, when the control system is in a second state, the first switch assembly and the second switch assembly are controlled to switch between an on state and an open state, thereby supplying alternating current between the first battery group and the second battery group, and causing the first battery group and the second battery group to alternately charge and discharge.

[0102] When the battery level of the first battery group is greater than the battery level of the second battery group, the first control cycle includes controlling the first switch assembly and the second switch assembly to switch between the ON and OFF states, controlling the first switch assembly to the OFF state, controlling the second switch assembly to the OFF state, controlling the first battery group to charge the windings, and controlling the first battery group, the second battery group, and the capacitor to supply power to the load.

[0103] The process includes, within a second period of each control cycle, controlling the first switch assembly to be open, controlling the second switch assembly to be closed, controlling the windings to charge the second battery group, and controlling the first and second battery groups to supply power to the capacitor and load.

[0104] In addition, in some implementations, when the control system is in a second state, the first switch assembly and the second switch assembly are controlled to switch between an on state and an open state, thereby supplying alternating current between the first battery group and the second battery group, and causing the first battery group and the second battery group to alternately charge and discharge.

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

[0106] The further steps include, within a fourth period of each control cycle, controlling the first switch assembly to a closed state, controlling the second switch assembly to an open state, controlling the windings to charge the first battery group, and controlling the first and second battery groups to supply power to the capacitor and load.

[0107] In addition, in some implementations, the method includes the step of controlling the first and second switch assemblies to alternately turn on when the second battery group is damaged, causing the windings, first switch assembly, second switch assembly, and capacitor to form a boost circuit, and the first battery group to supply power to the load via the boost circuit.

[0108] The further step includes, if the first battery group is damaged, controlling the first switch assembly and the second switch assembly to alternately turn on, causing the windings, the first switch assembly, the second switch assembly, and the capacitor to form a boost circuit, and the second battery group to supply power to the load via the boost circuit.

[0109] Embodiments of this disclosure provide an electric transport means, which includes a battery self-heating control system in any of the embodiments described above.

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

[0111] Since the charging interface is electrically connected to the battery pack 10, the battery pack 10 may be charged via 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 may be further controlled via the controller to cause the battery pack 10 to self-heat.

[0112] Please note that all embodiments described herein are described progressively. The descriptions of each embodiment focus on the differences from other embodiments, and parts that are identical or similar in each embodiment are mutually referential.

[0113] While optional embodiments of the embodiments of this disclosure have been described, those skilled in the art, with knowledge of the basic creative concepts, can make additional changes and modifications to these embodiments. Therefore, the following claims are intended to be construed as encompassing any embodiments and all changes and modifications that fall within the scope of the embodiments of this disclosure.

[0114] Finally, it should be noted that relational terms as "first" and "second" in this specification are used solely to distinguish one entity from another and do not imply or require any actual relationship or order between these entities. Furthermore, the terms "includes," "equip," or any variation thereof are intended to encompass non-exclusive inclusion. Thus, an object or terminal device that includes a set of elements includes not only such elements but also other elements not expressly specified, or elements inherent to the object or terminal device. Unless otherwise restricted, an element restricted by "...includes" does not exclude other identical elements present in the article or terminal device that contains that element.

[0115] The technical solutions provided in this disclosure are described in detail above. The principles and implementations of this disclosure are described herein by using specific examples. In addition, those skilled in the art may modify specific implementations and scopes in accordance with the principles and implementations of this disclosure. In summary, nothing in this specification should be construed as limiting this disclosure.

Claims

1. A battery self-heating control system comprising a battery pack, windings, 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, with a connecting wire extending between the first battery group and the second battery group, 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 group and the first end of the capacitor, the second switch assembly is electrically connected to the negative terminal of the second battery group and the second end of the capacitor, the first and second ends 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, and is configured to control the first switch assembly and the second switch assembly to switch between a closed state and an open state, and to heat the battery pack by alternately charging and discharging the first battery group and the second battery group via the winding, and at least one of the first battery group, the second battery group and the capacitor is configured to supply power to the load. When the control system is in the first state, within the first half-cycle 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 closed state and the open state, to charge the winding, and to control the first battery group to charge the second battery group via the winding, and the capacitor and / or the first battery group is configured to supply power to the load. A battery self-heating control system wherein, within a second half-cycle 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 closed state and the open state, to charge the windings, and to control the second battery group to charge the first battery group via the windings, and the capacitor and / or the second battery group is configured to supply power to the load.

2. Within the first period of the first half-cycle, the controller controls the first switch assembly to be in the closed state, controls the second switch assembly to be in the open state, controls the first battery group to charge the winding, and controls the capacitor to supply power to the load. The battery self-heating control system according to claim 1, wherein within a second period of the first half-cycle, the controller controls the first switch assembly to be in the open state, controls the second switch assembly to be in the 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.

3. Within the third period of the second half-cycle, the controller controls the first switch assembly to be in the open state, controls the second switch assembly to be in the closed state, controls the second battery group to charge the winding, and controls the capacitor to supply power to the load. The battery self-heating control system according to claim 2, wherein within 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 battery group, and controls the second battery group and the capacitor to supply power to the load.

4. When the control system is in the second state, the battery level of the first battery group is greater than the battery level of the second battery group, and within the first period of each control cycle, the controller controls the first switch assembly and the second switch assembly to switch between the closed state and the open state, controls the first switch assembly to be in the closed state, controls the second switch assembly to be in the open state, controls the first battery group to charge the winding, and controls the first battery group, the second battery group and the capacitor to supply power to the load. The battery self-heating control system according to claim 3, wherein during the second period of each control cycle, the controller controls the first switch assembly to be in the open state, controls the second switch assembly to be in the closed state, controls the winding to charge the second battery group, and controls the first battery group and the second battery group to supply power to the capacitor and the load.

5. When the control system is in the second state, the battery level of the second battery group is greater than the battery level of the first battery group, and within 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 battery group to charge the winding, and controls the first battery group, the second battery group and the capacitor to supply power to the load. The battery self-heating control system according to claim 4, wherein during 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 windings to charge the first battery group, and controls the first battery group and the second battery group to supply power to the capacitor and the load.

6. If the second battery group fails, the controller controls the first switch assembly and the second switch assembly to alternately enter the closed state, 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. The battery self-heating control system according to claim 1, wherein, in the event of damage to the first battery group, the controller controls the first switch assembly and the second switch assembly to alternately close, causing the winding, the first switch assembly, the second switch assembly, and the capacitor to form a boost circuit, and the second battery group supplies power to the load via the boost circuit.

7. A switch device is placed on the connection line, the switch device is electrically connected to the controller, and the controller is configured to control the switch device to the closed state or the open state. When the switch device is in the closed state, the battery pack supplies power to the load and performs self-heating. 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.

8. A control method for the battery self-heating control system according to Claim 1, The steps include controlling the first switch assembly and the second switch assembly to switch between a closed state and an open state, The battery pack is heated by alternately charging and discharging the first battery group and the second battery group via windings, and the first battery group, the second battery group, and at least one of the capacitors are configured to supply power to a load. A control method including

9. Electrical transport means comprising a battery self-heating control system according to any one of claims 1 to 7.

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