Battery pack heating circuit and energy storage cabinet

Abstract

Disclosed in the present application are a battery pack heating circuit and an energy storage cabinet. The circuit comprises a first battery pack, a second battery pack, a first controller, a second controller and a first energy storage assembly; the first energy storage assembly internally comprises an inductor; the first controller is separately connected to the first battery pack and the first energy storage assembly; the second controller is separately connected to the second battery pack and the first energy storage assembly; a negative electrode of the first battery pack is connected to a negative electrode of the second battery pack; when the circuit is in a first timing mode, the first battery pack discharges into the inductor of the first energy storage assembly; when the circuit is in a second timing mode, the inductor of the first energy storage assembly charges the second battery pack.

Description

Battery pack heating circuit and energy storage cabinet

[0001] Cross-reference to Related Applications

[0002] The present application is based on the Chinese patent application No. 2024106586903, filed on May 24, 2024, entitled "Battery pack heating circuit and energy storage cabinet", and claims priority to the Chinese patent application No. 2024106586903, the whole content of which is incorporated herein by reference. TECHNICAL FIELD

[0003] The present application relates to the technical field of batteries, in particular to a battery pack heating circuit and an energy storage cabinet. BACKGROUND

[0004] With the development of economy and technology, renewable energy has been widely used in various fields. However, due to the instability and intermittency of renewable energy, the application of renewable energy in industry and commerce has been limited to a certain extent. The development of energy storage technology can solve the shortcomings of renewable energy, that is, it can store energy when there is excess energy and output energy when needed. The battery of an electric vehicle can be used for energy storage. However, the performance of the battery is easily affected by temperature, especially in low temperature environment, the performance of the battery will be significantly degraded.

[0005] In related technologies, the battery is generally heated by external heating or internal heating. However, the external heating scheme usually requires additional heating devices to input heat to the battery, which can cause uneven heating of the battery and affect the service life of the battery, and can also cause safety problems. At the same time, the system complexity of external heating is higher, which can additionally increase the volume and cost. The internal heating scheme often needs to increase additional isolation devices, which does not fully utilize the existing system and increases the cost and volume.

[0006] SUMMARY

[0007] In the summary section, a series of simplified concepts are introduced, which will be further described in detail in the detailed description section. The summary section of the present application does not mean to try to limit the key features and necessary technical features of the claimed technical solution, and does not mean to try to determine the protection scope of the claimed technical solution.

[0008] In view of the existing problems, the application provides a battery pack heating circuit, which comprises a first battery pack, a second battery pack, a first controller, a second controller and a first energy storage component. The first energy storage component internally comprises an inductor. The negative electrode of the first battery pack is connected with the negative electrode of the second battery pack. The first input end of the first controller is connected with the positive electrode of the first battery pack, and the second input end of the first controller is connected with the negative electrode of the first battery pack. The first output end of the second controller is connected with the positive electrode of the second battery pack, and the second output end of the second controller is connected with the negative electrode of the second battery pack. The input end of the first energy storage component is connected with the output end of the first controller, and the output end of the first energy storage component is connected with the input end of the second controller. When the battery pack heating circuit is in a first timing mode, the first battery pack discharges the inductor of the first energy storage component through the first controller and the second controller. When the battery pack heating circuit is in a second timing mode, the inductor of the first energy storage component charges the second battery pack through the first controller and the second controller.

[0009] Exemplarily, the first energy storage component comprises a first sub-energy storage component, the first sub-energy storage component internally comprises an inductor, the input end of the first sub-energy storage component is connected with the output end of the first controller, and the output end of the first sub-energy storage component is connected with the input end of the second controller. Alternatively, the first energy storage component comprises a first sub-energy storage component and a second sub-energy storage component, the first sub-energy storage component and the second sub-energy storage component both internally comprise an inductor, the input end of the first sub-energy storage component is connected with the output end of the first controller, the input end of the second sub-energy storage component is connected with the output end of the first sub-energy storage component, and the output end of the second sub-energy storage component is connected with the input end of the second controller.

[0010] Exemplarily, the first controller comprises a first bridge arm assembly connected to the first input and the second input of the first controller respectively or a plurality of first bridge arm assemblies connected in parallel between the first input and the second input of the first controller, each of the first bridge arm assemblies comprises a first bridge group and a second bridge group connected in series, the drain of the first bridge group is connected to the first input of the first controller, the source of the second bridge group is connected to the second input of the first controller, the source of the first bridge group and the drain of the second bridge group in each of the first bridge arm assemblies are connected in series and connected to an inductor of the first energy storage assembly; the second controller comprises a second bridge arm assembly connected to the first output and the second output of the second controller respectively or a plurality of second bridge arm assemblies connected in parallel between the first output and the second output of the second controller, each of the second bridge arm assemblies comprises a third bridge group and a fourth bridge group connected in series, the drain of the third bridge group is connected to the first output of the second controller, the source of the fourth bridge group is connected to the second output of the second controller, the source of the third bridge group and the drain of the fourth bridge group in each of the second bridge arm assemblies are connected in series and connected to an inductor of the first energy storage assembly.

[0011] Exemplarily, when the battery pack heating circuit is in the first timing mode, the first controller controls the first bridge group in at least one of the first bridge arm assemblies to be turned on and the second bridge group to be turned off, and the second controller controls the fourth bridge group in at least one of the second bridge arm assemblies to be turned on and the third bridge group to be turned off, so that the first battery pack discharges the inductor of the first energy storage assembly through the first bridge group and the fourth bridge group.

[0012] Exemplarily, when the battery pack heating circuit is in the second timing mode, the first controller controls the second bridge group in at least one of the first bridge arm assemblies to be turned on and the first bridge group to be turned off, and the second controller controls the third bridge group in at least one of the second bridge arm assemblies to be turned on and the fourth bridge group to be turned off, so that the inductor of the first energy storage assembly charges the second battery pack through the second bridge group and the third bridge group.

[0013] Exemplarily, the first bridge group, the second bridge group, the third bridge group and the fourth bridge group each comprise an insulated gate bipolar transistor.

[0014] Exemplarily, the first sub-energy storage assembly and the second sub-energy storage assembly each are a driving motor, the inductor of the first sub-energy storage assembly and the inductor of the second sub-energy storage assembly each are a winding of the driving motor, and the first controller and the second controller each are a motor controller.

[0015] Exemplarily, the battery pack heating circuit further comprises a first capacitor and a second capacitor, the first capacitor is connected in parallel between the first input terminal and the second input terminal of the first controller, and the second capacitor is connected in parallel between the first output terminal and the second output terminal of the second controller.

[0016] Another aspect of the present application provides a battery pack heating circuit, comprising a first battery pack, a second battery pack, a first controller, a second controller, a third controller, a fourth controller, a first energy storage component and a second energy storage component, the power of the second energy storage component is less than the power of the first energy storage component, and the first energy storage component and the second energy storage component each comprise an inductor inside; the first input terminal of the first controller is connected to the positive electrode of the first battery pack, and the second input terminal of the first controller is connected to the negative electrode of the first battery pack; the first output terminal of the second controller is connected to the positive electrode of the second battery pack, and the second output terminal of the second controller is connected to the negative electrode of the second battery pack; the input terminal of the first energy storage component is connected to the output terminal of the first controller, and the output terminal of the first energy storage component is connected to the input terminal of the second controller; the first output terminal of the third controller is connected to the positive electrode of the first battery pack, and the second output terminal of the third controller is connected to the negative electrode of the first battery pack; the first input terminal of the fourth controller is connected to the positive electrode of the second battery pack, and the second input terminal of the fourth controller is connected to the negative electrode of the second battery pack; the input terminal of the second energy storage component is connected to the output terminal of the fourth controller, and the output terminal of the second energy storage component is connected to the input terminal of the third controller; wherein when the battery pack heating circuit is in a first timing mode, the first battery pack discharges the inductor of the first energy storage component and the inductor of the second energy storage component through the first controller, the second controller, the third controller and the fourth controller; when the battery pack heating circuit is in a second timing mode, the inductor of the first energy storage component and the inductor of the second energy storage component charge the second battery pack through the first controller, the second controller, the third controller and the fourth controller.

[0017] Exemplarily, the first energy storage component includes a first sub-energy storage component, or includes a first sub-energy storage component and a second sub-energy storage component; the second energy storage component includes a third sub-energy storage component, or includes a third sub-energy storage component and a fourth sub-energy storage component; wherein, when the first energy storage component includes the first sub-energy storage component, the first sub-energy storage component internally includes an inductor, an input end of the first sub-energy storage component is connected to an output end of the first controller, and an output end of the first sub-energy storage component is connected to an input end of the second controller; when the first energy storage component includes the first sub-energy storage component and the second sub-energy storage component, the first sub-energy storage component and the second sub-energy storage component both internally include an inductor, an input end of the first sub-energy storage component is connected to an output end of the first controller, an input end of the second sub-energy storage component is connected to an output end of the first sub-energy storage component, and an output end of the second sub-energy storage component is connected to an input end of the second controller; when the second energy storage component includes the third sub-energy storage component, the third sub-energy storage component internally includes an inductor, an output end of the third sub-energy storage component is connected to an input end of the third controller, and an input end of the third sub-energy storage component is connected to an output end of the fourth controller; when the second energy storage component includes the third sub-energy storage component and the fourth sub-energy storage component, the third sub-energy storage component and the fourth sub-energy storage component both internally include an inductor, an output end of the third sub-energy storage component is connected to an input end of the third controller, an input end of the third sub-energy storage component is connected to an output end of the fourth sub-energy storage component, and an input end of the fourth sub-energy storage component is connected to an output end of the fourth controller.

[0018] Exemplarily, the first controller comprises a first bridge arm component connected to the first input and the second input of the first controller respectively or a plurality of first bridge arm components connected in parallel between the first input and the second input of the first controller, each of the first bridge arm components comprises a first bridge group and a second bridge group connected in series, the drain of the first bridge group is connected to the first input of the first controller, the source of the second bridge group is connected to the second input of the first controller, the source of the first bridge group and the drain of the second bridge group in each of the first bridge arm components are connected in series and connected to an inductor of the first energy storage component; the second controller comprises a second bridge arm component connected to the first output and the second output of the second controller respectively or a plurality of second bridge arm components connected in parallel between the first output and the second output of the second controller, each of the second bridge arm components comprises a third bridge group and a fourth bridge group connected in series, the drain of the third bridge group is connected to the first output of the second controller, the source of the fourth bridge group is connected to the second output of the second controller, the source of the third bridge group and the drain of the fourth bridge group in each of the second bridge arm components are connected in series and connected to an inductor of the first energy storage component; the third controller comprises a third bridge arm component connected to the first output and the second output of the third controller respectively or a plurality of third bridge arm components connected in parallel between the first output and the second output of the third controller, each of the third bridge arm components comprises a fifth bridge group and a sixth bridge group connected in series, the drain of the fifth bridge group is connected to the first output of the third controller, the source of the sixth bridge group is connected to the second output of the third controller, the source of the fifth bridge group and the drain of the sixth bridge group in each of the third bridge arm components are connected in series and connected to an inductor of the second energy storage component; the fourth controller comprises a fourth bridge arm component connected to the first input and the second input of the fourth controller respectively or a plurality of fourth bridge arm components connected in parallel between the first input and the second input of the fourth controller, each of the fourth bridge arm components comprises a seventh bridge group and an eighth bridge group connected in series, the drain of the seventh bridge group is connected to the first input of the fourth controller, the source of the eighth bridge group is connected to the second input of the fourth controller, the source of the seventh bridge group and the drain of the eighth bridge group in each of the fourth bridge arm components are connected in series and connected to an inductor of the second energy storage component.

[0019] Exemplarily, when the battery pack heating circuit is in the first timing mode, the first controller controls the first bridge group in the at least one first bridge arm assembly to be turned on, the second bridge group to be turned off, the second controller controls the fourth bridge group in the at least one second bridge arm assembly to be turned on, the third bridge group to be turned off, the third controller controls the fifth bridge group in the at least one fourth bridge arm assembly to be turned off, the sixth bridge group to be turned on, and the fourth controller controls the seventh bridge group in the at least one fifth bridge arm assembly to be turned off, the eighth bridge group to be turned on, so that the first battery pack discharges the inductance of the first energy storage assembly and the inductance of the second energy storage assembly through the first bridge group, the fourth bridge group, the sixth bridge group and the eighth bridge group.

[0020] Exemplarily, when the battery pack heating circuit is in the second timing mode, the first controller controls the second bridge group in the at least one first bridge arm assembly to be turned on, the first bridge group to be turned off, the second controller controls the third bridge group in the at least one second bridge arm assembly to be turned on, the fourth bridge group to be turned off, the third controller controls the fifth bridge group in the at least one fourth bridge arm assembly to be turned off, the sixth bridge group to be turned on, and the fourth controller controls the seventh bridge group in the at least one fifth bridge arm assembly to be turned off, the eighth bridge group to be turned on, so that the inductance of the first energy storage assembly and the inductance of the second energy storage assembly charge the second battery pack through the second bridge group, the third bridge group, the sixth bridge group and the eighth bridge group.

[0021] Exemplarily, the first bridge group, the second bridge group, the third bridge group, the fourth bridge group, the fifth bridge group, the sixth bridge group, the seventh bridge group and the eighth bridge group each include an insulated gate bipolar transistor.

[0022] Exemplarily, the first sub-energy storage assembly and the second sub-energy storage assembly each are a driving motor, the inductance of the first sub-energy storage assembly and the inductance of the second sub-energy storage assembly each are a winding of the driving motor, and the first controller and the second controller each are a motor controller; the third sub-energy storage assembly and the fourth sub-energy storage assembly each are a compressor, the inductance of the third sub-energy storage assembly and the inductance of the fourth sub-energy storage assembly each are a winding of the compressor, and the third controller and the fourth controller each are a compressor controller.

[0023] Exemplarily, the battery pack heating circuit further comprises a first capacitor, a second capacitor, a third capacitor and a fourth capacitor, the first capacitor is connected in parallel between the first input end and the second input end of the first controller, the second capacitor is connected in parallel between the first output end and the second output end of the second controller, the third capacitor is connected in parallel between the first output end and the second output end of the third controller, and the fourth capacitor is connected in parallel between the first input end and the second input end of the fourth controller.

[0024] In still another aspect, the present application provides a battery energy storage cabinet, which comprises the above battery pack heating circuit.

[0025] The battery pack heating circuit and the battery energy storage cabinet of the present application can realize the self-heating function of the battery pack without setting additional heating devices or other devices such as isolation devices, and do not increase the additional cost and volume. BRIEF DESCRIPTION OF DRAWINGS

[0026] The above and other objects, features and advantages of the present application will become more apparent from the following detailed description of embodiments of the present application, taken in conjunction with the accompanying drawings. The drawings provided in the present application are used to provide further understanding of the embodiments of the present application, and constitute a part of the specification, and are used to explain the present application together with the embodiments of the present application, and do not constitute a limitation of the present application. In the drawings, the same reference numerals generally represent the same components or steps.

[0027] In the drawings:

[0028] FIG. 1 shows a schematic diagram of the current flow direction of the battery pack heating circuit in a first timing mode according to an embodiment of the present application.

[0029] FIG. 2 shows a schematic diagram of the current flow direction of the battery pack heating circuit in a second timing mode according to an embodiment of the present application.

[0030] FIG. 3 shows a schematic diagram of the current flow direction of the battery pack heating circuit in a first timing mode according to another embodiment of the present application.

[0031] FIG. 4 shows a schematic diagram of the current flow direction of the battery pack heating circuit in a second timing mode according to another embodiment of the present application.

[0032] FIG. 5 shows a schematic diagram of the current flow direction of the battery pack heating circuit in a first timing mode according to another embodiment of the present application.

[0033] FIG. 6 shows a schematic diagram of the current flow direction of the battery pack heating circuit in a second timing mode according to another embodiment of the present application.

[0034] FIG. 7 shows a schematic diagram of current flow in a battery pack heating circuit according to another embodiment of the present application in a first timing mode.

[0035] FIG. 8 shows a schematic diagram of current flow in a battery pack heating circuit according to another embodiment of the present application in a second timing mode.

[0036] FIG. 9 shows a schematic diagram of current flow in a battery pack heating circuit according to another embodiment of the present application in a first timing mode.

[0037] FIG. 10 shows a schematic diagram of current flow in a battery pack heating circuit according to another embodiment of the present application in a second timing mode.

[0038] FIG. 11 shows a schematic diagram of current flow in a battery pack heating circuit according to another embodiment of the present application in a first timing mode.

[0039] FIG. 12 shows a schematic diagram of current flow in a battery pack heating circuit according to another embodiment of the present application in a second timing mode. DETAILED DESCRIPTION

[0040] In order to make the objectives, technical solutions, and advantages of the present application more apparent, the following will describe example embodiments according to the present application in detail with reference to the accompanying drawings. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all embodiments of the present application. It should be understood that the present application is not limited by the example embodiments described herein. Any other embodiments obtained by those skilled in the art based on the embodiments of the present application described in the present application without creative effort should fall within the protection scope of the present application.

[0041] The following describes a battery pack heating circuit according to an embodiment of the present application with reference to FIGS. 1 to 4, in which FIG. 1 shows a schematic diagram of current flow in a battery pack heating circuit according to an embodiment of the present application in a first timing mode, FIG. 2 shows a schematic diagram of current flow in a battery pack heating circuit according to an embodiment of the present application in a second timing mode, FIG. 3 shows a schematic diagram of current flow in a battery pack heating circuit according to another embodiment of the present application in a first timing mode, and FIG. 4 shows a schematic diagram of current flow in a battery pack heating circuit according to another embodiment of the present application in a second timing mode.

[0042] As shown in FIGS. 1-4, the battery pack heating circuit of the present application includes a first battery pack, a second battery pack, a first controller, a second controller, and a first energy storage component, which internally includes an inductor, wherein: the negative electrode of the first battery pack is connected to the negative electrode of the second battery pack; the first input end of the first controller is connected to the positive electrode of the first battery pack, and the second input end of the first controller is connected to the negative electrode of the first battery pack; the first output end of the second controller is connected to the positive electrode of the second battery pack, and the second output end of the second controller is connected to the negative electrode of the second battery pack; the input end of the first energy storage component is connected to the output end of the first controller, and the output end of the first energy storage component is connected to the input end of the second controller.

[0043] As shown in FIGS. 1 and 3, when the battery pack heating circuit is in the first timing mode, the first battery pack discharges the inductor of the first energy storage component through the first controller and the second controller, and the arrow direction in FIGS. 1 and 3 is the current direction when the battery pack heating circuit is in the first timing mode. As shown in FIGS. 2 and 4, when the battery pack heating circuit is in the second timing mode, the inductor of the first energy storage component discharges the second battery pack through the first controller and the second controller, and the arrow direction in FIGS. 2 and 4 is the current direction when the battery pack heating circuit is in the second timing mode.

[0044] Specifically, the battery pack heating circuit of the present application can be in the first timing mode and the second timing mode. In the first timing mode, a current loop can be connected between the first battery pack, the first controller, the second controller, and the first energy storage component, the first battery pack can provide electrical energy to the inductor of the first energy storage component, and the inductor of the first energy storage component can store energy. Then, the circuit is switched to the second timing mode, at this time a current loop can be connected between the second battery pack, the first controller, the second controller, and the first energy storage component, and the inductor of the first energy storage component can charge the second battery pack with the stored energy. In this way, by cyclically switching the first timing mode and the second timing mode, the current will pass through the first battery pack and the second battery pack and can generate heat on the internal resistance of the first battery pack and the second battery pack during the discharging process of the first battery pack and the charging process of the second battery pack, thereby achieving self-heating of the first battery pack and the second battery pack.

[0045] Therefore, the battery pack heating circuit of the application can switch the first timing mode and the second timing mode. In the first timing mode, the first battery pack discharges the inductance of the first energy storage component. In the second timing mode, the inductance of the first energy storage component charges the second battery pack. In the process of discharging the first battery pack and in the process of charging the second battery pack, the current passes through the first battery pack and the second battery pack and can generate heat on the internal resistance of the first battery pack and the second battery pack, thereby achieving self-heating of the first battery pack and the second battery pack. Moreover, the application does not need to set additional heating devices or isolation devices and other devices, and will not increase additional costs and volume.

[0046] In the embodiments of the application, the first battery pack and the second battery pack can each include a group of battery cells, and the number of battery cells in different groups of battery cells can be the same or different, which is not limited.

[0047] In the embodiments of the application, as shown in FIGS. 1 and 2, the first energy storage component includes a first sub-energy storage component, the first sub-energy storage component internally includes an inductance, an input end of the first sub-energy storage component is connected to an output end of the first controller, and an output end of the first sub-energy storage component is connected to an input end of the second controller; or, as shown in FIGS. 3 and 4, the first energy storage component includes a first sub-energy storage component and a second sub-energy storage component, the first sub-energy storage component and the second sub-energy storage component each internally include an inductance, an input end of the first sub-energy storage component is connected to an output end of the first controller, an input end of the second sub-energy storage component is connected to an output end of the first sub-energy storage component, and an output end of the second sub-energy storage component is connected to an input end of the second controller. Exemplarily, when the first energy storage component includes the first sub-energy storage component and the second sub-energy storage component, the power is greater than that of the scheme in which the first energy storage component includes the first sub-energy storage component.

[0048] In the embodiments of the application, as shown in FIGS. 1 to 4, the first controller includes a first bridge arm component connected to the first input end and the second input end of the first controller or a plurality of first bridge arm components connected in parallel between the first input end and the second input end of the first controller. Each first bridge arm component includes a first bridge group 110 and a second bridge group 120 connected in series, the drain of the first bridge group 110 is connected to the first input end of the first controller, the source of the second bridge group 120 is connected to the second input end of the first controller, and the source of the first bridge group 110 and the drain of the second bridge group 120 in each first bridge arm component are connected in series and connected to one inductance of the first energy storage component.

[0049] In the embodiments of the present application, as shown in FIGS. 1-4, the second controller includes one second bridge arm assembly connected to the first output and the second output of the second controller respectively or a plurality of second bridge arm assemblies connected in parallel between the first output and the second output of the second controller, each of the second bridge arm assemblies includes a third bridge group 130 and a fourth bridge group 140 connected in series, the drain of the third bridge group 130 is connected to the first output of the second controller, the source of the fourth bridge group 140 is connected to the second output of the second controller, the source of the third bridge group 130 and the drain of the fourth bridge group 140 in each of the second bridge arm assemblies are connected in series and connected to one inductor of the first energy storage assembly.

[0050] In the embodiments of the present application, as shown in FIGS. 1-4, the first sub-energy storage assembly and the second sub-energy storage assembly each include three inductors, at this time, the first controller includes three first bridge arm assemblies, and the second controller includes three second bridge arm assemblies.

[0051] In the embodiments of the present application, the first bridge group 110, the second bridge group 120, the third bridge group 130 and the fourth bridge group 140 each include one switch tube and one diode, wherein the diode is connected in parallel between the drain and the source of the switch tube.

[0052] In some embodiments, the first bridge group 110, the second bridge group 120, the third bridge group 130 and the fourth bridge group 140 each include an IGBT (Insulated Gate Bipolar Transistor), an MOSFET (Metal Oxide Semiconductor Field Effect Transistor), an HEMT (High Electron Mobility Transistor) or the like power electronic device, and the material of the power electronic device can be Si, SiC, GaN or the like, which is not limited.

[0053] In the embodiments of the present application, the first sub-energy storage assembly and the second sub-energy storage assembly are both driving motors, the inductance of the first sub-energy storage assembly and the inductance of the second sub-energy storage assembly are both windings of the driving motor, and the first controller and the second controller are both motor controllers. Taking a three-phase motor as an example, the inductance of the first sub-energy storage assembly and the inductance of the second sub-energy storage assembly are three-phase windings of the three-phase motor, and the motor controller includes three bridge arm assemblies. Exemplarily, the driving motor has large power, and when the first sub-energy storage assembly and the second sub-energy storage assembly are both driving motors, the large-power self-heating function of the first battery pack and the second battery pack can be realized. The driving motor and the motor controller can be driving motors and motor controllers on a used electric vehicle, so that the used parts can be fully utilized and the cost can be reduced to the greatest extent. Exemplarily, the three-phase windings in the three-phase motor can be controlled by the same phase control method, or can be controlled by the phase-shifted carrier frequency modulation to reduce the current ripple.

[0054] In the embodiments of the present application, the bridge group in the first controller and the second controller can be switched between the first timing mode and the second timing mode. Specifically, as shown in FIGS. 1 and 3, when the battery pack heating circuit is in the first timing mode, the first controller controls the first bridge group 110 in the at least one first bridge arm assembly to be turned on and the second bridge group 120 to be turned off, and the second controller controls the fourth bridge group 140 in the at least one second bridge arm assembly to be turned on and the third bridge group 130 to be turned off, so that the first battery pack discharges the inductance of the first energy storage assembly through the first bridge group 110 and the fourth bridge group 140. Exemplarily, during the discharging of the first battery pack, the current can pass through the first battery pack to realize the self-heating of the first battery pack. Taking an example in which the first controller includes three first bridge arm assemblies and the second controller includes three second bridge arm assemblies, the first controller can control only the first bridge group 110 in one first bridge arm assembly to be turned on and the second bridge group 120 to be turned off, and the second controller can control only the fourth bridge group 140 in the corresponding second bridge arm assembly to be turned on and the third bridge group 130 to be turned off, at this time, the first bridge group and the second bridge group in the remaining first bridge arm assemblies of the first controller and the third bridge group and the fourth bridge group in the remaining second bridge arm assemblies of the second controller are all turned off; the first controller can also control the first bridge group 110 in the three first bridge arm assemblies to be turned on and the second bridge group 120 to be turned off, at this time, the second controller also controls the fourth bridge group 140 in the three second bridge arm assemblies to be turned on and the third bridge group 130 to be turned off.

[0055] In the embodiments of the present application, as shown in FIG. 2 and FIG. 4, when the battery pack heating circuit is in the second timing mode, the first controller controls the second bridge group 120 in the at least one first bridge arm assembly to be turned on and the first bridge group 110 to be turned off, and the second controller controls the third bridge group 130 and the fourth bridge group 140 in the at least one second bridge arm assembly to be turned on and turned off, so that the inductor of the first energy storage assembly discharges the second battery pack through the second bridge group 120 and the third bridge group 130. Exemplarily, during the charging of the second battery pack, the current can pass through the second battery pack to achieve self-heating of the second battery pack.

[0056] In the embodiments of the present application, as shown in FIG. 1 to FIG. 4, the battery pack heating circuit further comprises a first capacitor C1 and a second capacitor C2, wherein the first capacitor C1 is connected in parallel between the first input and the second input of the first controller, and the second capacitor C2 is connected in parallel between the first output and the second output of the second controller. Exemplarily, the branch in which the first capacitor C1 and the second capacitor C2 are located can realize decoupling, filtering, energy storage and the like.

[0057] It should be noted that FIG. 1 and FIG. 3 show that the first battery pack discharges the inductor of the first energy storage assembly, and FIG. 2 and FIG. 4 show that the inductor of the first energy storage assembly charges the second battery pack to achieve self-heating of the first battery pack and the second battery pack. Accordingly, in other embodiments, the battery pack heating circuit can also be in a third timing mode and a fourth timing mode. When the battery pack heating circuit is in the third timing mode, the second battery pack discharges the inductor of the first energy storage assembly through the first controller and the second controller, and when the battery pack is in the fourth timing mode, the inductor of the first energy storage assembly charges the first battery pack. Alternating the third timing mode and the fourth timing mode can also achieve self-heating of the first battery pack and the second battery pack.

[0058] In some embodiments, when the battery pack heating circuit is in the third timing mode, the first controller controls the second bridge group 120 in the at least one first bridge arm assembly to be turned on and the first bridge group 110 to be turned off, and the second controller controls the third bridge group 130 and the fourth bridge group 140 in the at least one second bridge arm assembly to be turned on and turned off, so that the second battery pack discharges the inductor of the first energy storage assembly through the second bridge group 120 and the third bridge group 130. When the battery pack is in the fourth timing mode, the first controller controls the first bridge group 110 in the at least one bridge arm assembly to be turned on and the second bridge group 120 to be turned off, and the second controller controls the fourth bridge group 140 and the third bridge group 130 in the at least one second bridge arm assembly to be turned on and turned off, so that the inductor of the first energy storage assembly charges the first battery pack through the first bridge group 110 and the fourth bridge group 140.

[0059] The structure of the battery pack heating circuit of the present application is introduced so far. The complete battery pack heating circuit can also include other components, which are not described here.

[0060] In summary, the battery pack heating circuit of the present application can switch between the first timing mode and the second timing mode. In the first timing mode, the first battery pack discharges the inductance of the first energy storage component. In the second timing mode, the inductance of the first energy storage component charges the second battery pack. During the discharging process of the first battery pack and the charging process of the second battery pack, the current flows through the first battery pack and the second battery pack and generates heat on the internal resistance of the first battery pack and the second battery pack, thereby achieving self-heating of the first battery pack and the second battery pack. The present application does not need to set additional heating devices or isolation devices and other devices, which will not increase the additional cost and volume. Exemplarily, the first sub-energy storage component and the second sub-energy storage component are both driving motors, which have large power and can achieve high-power self-heating function. Meanwhile, the first controller and the second controller are both motor controllers, which can use the driving motor and the motor controller on the waste electric vehicle, thereby fully utilizing the waste parts and minimizing the cost.

[0061] The battery pack heating circuit according to another embodiment of the present application is exemplarily described below with reference to FIGS. 5-12. FIGS. 5, 7, 9 and 11 each show the current flow direction of the battery pack heating circuit according to another embodiment of the present application in the first timing mode, and FIGS. 6, 8, 10 and 12 each show the current flow direction of the battery pack heating circuit according to another embodiment of the present application in the second timing mode.

[0062] As shown in FIGS. 5-12, the battery pack heating circuit of the present application includes a first battery pack, a second battery pack, a first controller, a second controller, a third controller, a fourth controller, a first energy storage component and a second energy storage component, the power of the first energy storage component is less than the power of the second energy storage component, and the inside of the first energy storage component and the second energy storage component each includes an inductor, wherein: the first input end of the first controller is connected to the positive electrode of the first battery pack, and the second input end of the first controller is connected to the negative electrode of the first battery pack; the first output end of the second controller is connected to the positive electrode of the second battery pack, and the second output end of the second controller is connected to the negative electrode of the second battery pack; the input end of the first energy storage component is connected to the output end of the first controller, and the output end of the first energy storage component is connected to the input end of the second controller; the first output end of the third controller is connected to the positive electrode of the first battery pack, and the second output end of the third controller is connected to the negative electrode of the first battery pack; the first input end of the fourth controller is connected to the positive electrode of the second battery pack, and the second input end of the fourth controller is connected to the negative electrode of the second battery pack; the input end of the second energy storage component is connected to the output end of the fourth controller, and the output end of the second energy storage component is connected to the input end of the third controller.

[0063] As shown in FIGS. 5, 7, 9 and 11, when the battery pack heating circuit is in the first timing mode, the first battery pack discharges the inductor of the first energy storage component and the inductor of the second energy storage component through the first controller, the second controller, the third controller and the fourth controller, and the arrow direction in FIGS. 5, 7, 9 and 11 is the current direction when the battery pack heating circuit is in the first timing mode. As shown in FIGS. 6, 8, 10 and 12, when the battery pack heating circuit is in the second timing mode, the inductor of the first energy storage component and the inductor of the second energy storage component discharge the second battery pack through the first controller, the second controller, the third controller and the fourth controller, and the arrow direction in FIGS. 6, 8, 10 and 12 is the current direction when the battery pack heating circuit is in the second timing mode.

[0064] Specifically, the battery pack heating circuit in the application can be in a first timing mode and a second timing mode. In the first timing mode, a current loop can be formed between the first battery pack, the first controller, the second controller, the third controller, the fourth controller, the first energy storage component and the second energy storage component, the first battery pack can provide electrical energy for the inductance of the first energy storage component and the inductance of the second energy storage component, and the inductance of the first energy storage component and the inductance of the second energy storage component can store energy. Then, the circuit is switched to the second timing mode, at this time a current loop can be formed between the second battery pack, the first controller, the second controller, the third controller, the fourth controller, the first energy storage component and the second energy storage component, and the inductance of the first energy storage component and the inductance of the second energy storage component can charge the second battery pack through the stored energy. In this way, by cyclically switching the first timing mode and the second timing mode, the current will pass through the first battery pack and the second battery pack and can generate heat on the internal resistance of the first battery pack and the second battery pack during the discharging process of the first battery pack and the charging process of the second battery pack, thereby achieving self-heating of the first battery pack and the second battery pack.

[0065] Meanwhile, since the power of the second energy storage component is less than the power of the first energy storage component, compared with the battery pack heating circuit without the second energy storage component described in the previous embodiment of the application, the battery pack heating circuit in this embodiment can realize the self-heating function of the small-power battery pack due to the power limitation of the second energy storage component.

[0066] Therefore, the battery pack heating circuit of the application can switch between the first timing mode and the second timing mode. In the first timing mode, the first battery pack discharges the inductance of the first energy storage component and the inductance of the second energy storage component, and in the second timing mode, the inductance of the first energy storage component and the inductance of the second energy storage component charge the second battery pack. During the discharging process of the first battery pack and the charging process of the second battery pack, the current will pass through the first battery pack and the second battery pack and can generate heat on the internal resistance of the first battery pack and the second battery pack, thereby achieving self-heating of the first battery pack and the second battery pack. Moreover, the application does not need to set additional heating devices or isolation devices and other devices, which will not increase the additional cost and volume. Meanwhile, due to the power limitation of the second energy storage component, the self-heating function of the small-power battery pack can be realized.

[0067] In the embodiments of the application, the first battery pack and the second battery pack can each include a group of battery cells, the number of battery cells in different groups of battery cells can be the same or different, which is not limited.

[0068] In the embodiments of the present application, the first energy storage component includes a first sub-energy storage component, or includes a first sub-energy storage component and a second sub-energy storage component; the second energy storage component includes a third sub-energy storage component, or includes a third sub-energy storage component and a fourth sub-energy storage component. Exemplarily, when the first energy storage component includes the first sub-energy storage component and the second sub-energy storage component, the power is greater than that when the first energy storage component includes the first sub-energy storage component. Exemplarily, when the second energy storage component includes the third sub-energy storage component and the fourth sub-energy storage component, the power is greater than that when the second energy storage component includes the third sub-energy storage component.

[0069] When the first energy storage component includes the first sub-energy storage component, the first sub-energy storage component internally includes an inductor, the input end of the first sub-energy storage component is connected to the output end of the first controller, and the output end of the first sub-energy storage component is connected to the input end of the second controller.

[0070] When the first energy storage component includes the first sub-energy storage component and the second sub-energy storage component, the first sub-energy storage component and the second sub-energy storage component internally include an inductor, the input end of the first sub-energy storage component is connected to the output end of the first controller, the input end of the second sub-energy storage component is connected to the output end of the first sub-energy storage component, and the output end of the second sub-energy storage component is connected to the output end of the second controller.

[0071] When the second energy storage component includes the third sub-energy storage component, the third sub-energy storage component internally includes an inductor, the output end of the third sub-energy storage component is connected to the input end of the third controller, and the input end of the third sub-energy storage component is connected to the output end of the fourth controller.

[0072] When the second energy storage component includes the third sub-energy storage component and the fourth sub-energy storage component, the third sub-energy storage component and the fourth sub-energy storage component internally include an inductor, the output end of the third sub-energy storage component is connected to the input end of the third controller, the input end of the third sub-energy storage component is connected to the output end of the fourth sub-energy storage component, and the input end of the fourth sub-energy storage component is connected to the output end of the fourth controller.

[0073] In the embodiments of the present application, the circuit diagrams shown in FIGS. 5 and 6 are for the first energy storage component including the first sub-energy storage component and the second energy storage component including the third sub-energy storage component; the circuit diagrams shown in FIGS. 7 and 8 are for the first energy storage component including the first sub-energy storage component and the second sub-energy storage component, and the second energy storage component including the third sub-energy storage component; the circuit diagrams shown in FIGS. 9 and 10 are for the first energy storage component including the first sub-energy storage component, and the second energy storage component including the third sub-energy storage component and the fourth sub-energy storage component; and the circuit diagrams shown in FIGS. 11 and 12 are for the first energy storage component including the first sub-energy storage component and the second sub-energy storage component, and the second energy storage component including the third sub-energy storage component and the fourth sub-energy storage component.

[0074] In embodiments of the application, as shown in FIGS. 5-12, the first controller includes one first bridge leg assembly connected to the first input and the second input of the first controller or a plurality of first bridge leg assemblies connected in parallel between the first input and the second input of the first controller, each first bridge leg assembly including a first bridge group 210 and a second bridge group 220 connected in series, the drain of the first bridge group 210 connected to the first input of the first controller, the source of the second bridge group 220 connected to the second input of the first controller, the source of the first bridge group 210 and the drain of the second bridge group 220 in each first bridge leg assembly connected in series and connected to one inductor of the first energy storage assembly.

[0075] In embodiments of the application, as shown in FIGS. 5-12, the second controller includes one second bridge leg assembly connected to the first output and the second output of the second controller or a plurality of second bridge leg assemblies connected in parallel between the first output and the second output of the second controller, each second bridge leg assembly including a third bridge group 230 and a fourth bridge group 240 connected in series, the drain of the third bridge group 230 connected to the first output of the second controller, the source of the fourth bridge group 240 connected to the second output of the second controller, the source of the third bridge group 230 and the drain of the fourth bridge group 240 in each second bridge leg assembly connected in series and connected to one inductor of the second energy storage assembly.

[0076] In embodiments of the application, as shown in FIGS. 5-12, the third controller includes one third bridge leg assembly connected to the first output and the second output of the third controller or a plurality of third bridge leg assemblies connected in parallel between the first output and the second output of the third controller, each third bridge leg assembly including a fifth bridge group 250 and a sixth bridge group 260 connected in series, the drain of the fifth bridge group 250 connected to the first output of the third controller, the source of the sixth bridge group 260 connected to the second output of the third controller, the source of the fifth bridge group 250 and the drain of the sixth bridge group 260 in each third bridge leg assembly connected in series and connected to one inductor of the second energy storage assembly.

[0077] In embodiments of the application, as shown in FIGS. 5-12, the fourth controller includes one fourth bridge leg assembly connected to the first input and the second input of the fourth controller or a plurality of fourth bridge leg assemblies connected in parallel between the first input and the second input of the fourth controller, each fourth bridge leg assembly including a seventh bridge group 270 and an eighth bridge group 280 connected in series, the drain of the seventh bridge group 270 connected to the first input of the fourth controller, the source of the eighth bridge group 280 connected to the second input of the fourth controller, the source of the seventh bridge group 270 and the drain of the eighth bridge group 280 in each fourth bridge leg assembly connected in series and connected to one inductor of the second energy storage assembly.

[0078] In the embodiments of the present application, the first energy storage assembly and the second energy storage assembly shown in FIGS. 5 to 12 each include three inductors, and the first controller includes three first bridge arm assemblies, the second controller includes three second bridge arm assemblies, the third controller includes three third bridge arm assemblies, and the fourth controller includes three fourth bridge arm assemblies.

[0079] In the embodiments of the present application, the first bridge group 210, the second bridge group 220, the third bridge group 230, and the fourth bridge group 240, the fifth bridge group 250, the sixth bridge group 260, the seventh bridge group 270, and the eighth bridge group 280 each include one switch tube and one diode, and the diode is connected in parallel between the drain and the source of the switch tube.

[0080] In some embodiments, the first bridge group 210, the second bridge group 220, the third bridge group 230, and the fourth bridge group 240, the fifth bridge group 250, the sixth bridge group 260, the seventh bridge group 270, and the eighth bridge group 280 each include an IGBT (Insulated Gate Bipolar Transistor), an MOSFET (Metal Oxide Semiconductor Field Effect Transistor), an HEMT (High Electron Mobility Transistor), or the like power electronic device, and the material of the power electronic device can be Si, SiC, GaN, or the like, which is not limited.

[0081] In the embodiments of the present application, the first sub-energy storage assembly and the second sub-energy storage assembly are both driving motors, the inductance of the first sub-energy storage assembly and the inductance of the second sub-energy storage assembly are both windings of the driving motor, and the first controller and the second controller are both motor controllers; the third sub-energy storage assembly and the fourth sub-energy storage assembly are both compressors, the inductance of the third sub-energy storage assembly and the inductance of the fourth sub-energy storage assembly are both windings of the compressor, and the third controller and the fourth controller are both compressor controllers. Taking the driving motor as a three-phase motor and the compressor as a three-phase compressor as an example, the inductance of the first sub-energy storage assembly and the second sub-energy storage assembly is the three-phase winding of the three-phase motor, and the inductance of the third sub-energy storage assembly and the fourth sub-energy storage assembly is the three-phase winding of the three-phase compressor. At this time, the motor controller and the compressor controller both include three bridge arm assemblies. Exemplarily, the power of the compressor is small, and when the third sub-energy storage assembly and the fourth sub-energy storage assembly are both compressors, the power of the compressor is limited, and the small-power self-heating function of the first battery pack and the second battery pack can be realized. Among them, the driving motor, the motor controller, the compressor and the compressor controller can adopt the driving motor, the motor controller, the compressor and the compressor controller on the old electric vehicle, so as to fully utilize the old parts and reduce the cost to the greatest extent. Exemplarily, the three-phase motor and the three-phase compressor can adopt the same phase control method, or the out-of-phase control can be realized according to the phase shift carrier frequency modulation to reduce the current ripple.

[0082] In the embodiments of the present application, the on-off switching circuit of the bridge group in the first controller, the second controller, the third controller and the fourth controller can be controlled to be in the first timing mode or in the second timing mode. Specifically, as shown in FIGS. 5, 7, 9 and 11, when the battery pack heating circuit is in the first timing mode, the first controller controls the first bridge group 210 in at least one bridge arm assembly to be turned on and the second bridge group 220 to be turned off, the second controller controls the fourth bridge group 240 in at least one second bridge arm assembly to be turned on and the third bridge group 230 to be turned off, the third controller controls the fifth bridge group 250 in at least one third bridge arm assembly to be turned off and the sixth bridge group 260 to be turned on, and the fourth controller controls the seventh bridge group 270 in at least one fourth bridge arm assembly to be turned off and the eighth bridge group 280 to be turned on, so that the first battery pack discharges the inductance of the first energy storage assembly and the inductance of the second energy storage assembly through the first bridge group 210, the fourth bridge group 240, the sixth bridge group 260 and the eighth bridge group 280. Exemplarily, during the discharging of the first battery pack, the current can pass through the first battery pack to realize the self-heating of the first battery pack.

[0083] In the embodiments of the present application, as shown in FIG. 6, FIG. 8, FIG. 10 and FIG. 12, when the battery pack heating circuit is in the second timing mode, the first controller controls the second bridge group 220 in the at least one bridge arm assembly to be on and the first bridge group 210 to be off, the second controller controls the third bridge group 230 in the at least one second bridge arm assembly to be on and the fourth bridge group 240 to be off, the third controller controls the fifth bridge group 250 in the at least one third bridge arm assembly to be off and the sixth bridge group 260 to be on, and the fourth controller controls the seventh bridge group 270 in the at least one fourth bridge arm assembly to be off and the eighth bridge group 280 to be on, so that the inductance of the first energy storage assembly and the inductance of the second energy storage assembly discharge the second battery pack through the second bridge group 220, the third bridge group 230, the sixth bridge group 260 and the eighth bridge group 280. Exemplarily, during the charging of the second battery pack, the current can pass through the second battery pack to achieve self-heating of the second battery pack.

[0084] In the embodiments of the present application, as shown in FIG. 5 to FIG. 12, the battery pack heating circuit further comprises a first capacitor C1, a second capacitor C2, a third capacitor C3 and a fourth capacitor C4, wherein the first capacitor C1 is connected in parallel between the first input terminal and the second input terminal of the first controller, the second capacitor C2 is connected in parallel between the first output terminal and the second output terminal of the second controller, the third capacitor C3 is connected in parallel between the first output terminal and the second output terminal of the third controller, and the fourth capacitor C4 is connected in parallel between the first input terminal and the second input terminal of the fourth controller. Exemplarily, the branches in which the first capacitor C1, the second capacitor C2, the third capacitor C3 and the fourth capacitor C4 are located can realize decoupling, filtering and energy storage functions.

[0085] It should be noted that FIG. 5, FIG. 7, FIG. 9 and FIG. 11 show that the first battery pack discharges the inductance of the first energy storage assembly and the inductance of the second energy storage assembly, and FIG. 6, FIG. 8, FIG. 10 and FIG. 12 show that the inductance of the first energy storage assembly and the inductance of the second energy storage assembly charge the second battery pack to achieve self-heating of the first battery pack and the second battery pack. Accordingly, in other embodiments, the battery pack heating circuit can also be in a third timing mode and a fourth timing mode, when the battery pack self-heating circuit is in the third timing mode, the second battery pack discharges the inductance of the first energy storage assembly and the inductance of the second energy storage assembly through the first controller, the second controller, the third controller and the fourth controller, and when the battery pack is in the fourth timing mode, the inductance of the first energy storage assembly and the inductance of the second energy storage assembly charge the first battery pack, and the third timing mode and the fourth timing mode are alternately switched, which can also achieve self-heating of the first battery pack and the second battery pack.

[0086] In some embodiments, when the battery pack heating circuit is in the third timing mode, the first controller controls the second bridge group 220 in the at least one first bridge arm assembly to be turned on, the first bridge group 210 to be turned off, the second controller controls the third bridge group 230 in the at least one second bridge arm assembly to be turned on, the fourth bridge group 240 to be turned off, the third controller controls the fifth bridge group 250 in the at least one third bridge arm assembly to be turned off, the sixth bridge group 260 to be turned on, and the fourth controller controls the seventh bridge group 270 in the at least one fourth bridge arm assembly to be turned off, the eighth bridge group 280 to be turned on, so that the second battery pack discharges the inductance of the first energy storage assembly and the inductance of the energy storage assembly through the second bridge group 120, the third bridge group 130, the sixth bridge group 260 and the eighth bridge group 280.

[0087] When the battery pack is in the fourth timing mode, the first controller controls the first bridge group 210 in the at least one bridge arm assembly to be turned on, the second bridge group 220 to be turned off, the second controller controls the fourth bridge group 240 in the at least one second bridge arm assembly to be turned on, the third bridge group 230 to be turned off, the third controller controls the fifth bridge group 250 in the at least one third bridge arm assembly to be turned off, the sixth bridge group 260 to be turned on, and the fourth controller controls the seventh bridge group 270 in the at least one fourth bridge arm assembly to be turned off, the eighth bridge group 280 to be turned on, so that the inductance of the first energy storage assembly and the inductance of the second energy storage assembly charge the first battery pack through the first bridge group 110, the fourth bridge group 140, the sixth bridge group 260 and the eighth bridge group 280.

[0088] So far, the structure of the battery pack heating circuit of the present application has been introduced. The complete battery pack heating circuit may also include other components, which are not described here.

[0089] In summary, the battery pack heating circuit of the application can switch between the first timing mode and the second timing mode. In the first timing mode, the first battery pack discharges the inductance of the first energy storage assembly and the inductance of the second energy storage assembly. In the second timing mode, the inductance of the first energy storage assembly and the inductance of the second energy storage assembly charge the second battery pack. During the discharging process of the first battery pack and the charging process of the second battery pack, the current flows through the first battery pack and the second battery pack and generates heat on the internal resistance of the first battery pack and the second battery pack, thereby achieving self-heating of the first battery pack and the second battery pack. The application does not need to set additional heating devices or isolation devices and other devices, which will not increase the additional cost and volume. At the same time, the power of the second energy storage assembly is small. Due to the power limitation of the second energy storage assembly, the self-heating function of the small power battery pack can be realized. Exemplarily, the first sub-energy storage assembly and the second sub-energy storage assembly are driving motors, the first controller and the second controller are motor controllers, the third sub-energy storage assembly and the fourth sub-energy storage assembly are compressors, and the third controller and the fourth controller are compressor controllers. The motor controller, the driving motor, the compressor, and the compressor controller can use the driving motor, the driving motor, the compressor, and the compressor controller on the waste electric vehicle, thereby fully utilizing the waste parts and minimizing the cost.

[0090] The application also provides an energy storage cabinet, which comprises the battery pack heating circuit described above. Exemplarily, the energy storage cabinet can also comprise other component structures, which are not limited in the application.

[0091] In the embodiments of the application, the battery pack heating circuit comprises the first battery pack, the second battery pack, the first controller, the second controller, the third controller, the fourth controller, the first energy storage assembly, and the second energy storage assembly. The first energy storage assembly comprises the first sub-energy storage assembly and the second sub-energy storage assembly, and the second energy storage assembly comprises the third sub-energy storage assembly and the fourth sub-energy storage assembly. Exemplarily, the first battery pack, the first controller, the third controller, the first sub-energy storage assembly, and the third sub-energy storage assembly can be collectively referred to as an energy storage module, and the second battery pack, the second controller, the fourth controller, the second sub-energy storage assembly, and the fourth sub-energy storage assembly can be collectively referred to as another energy storage module. The energy storage cabinet in the application can comprise two, three, or more such energy storage modules. Thus, even if one or several energy storage modules have problems, the self-heating function of the battery pack can be achieved by combining the other two normal energy storage modules to form the battery pack heating circuit of the application.

[0092] Although example embodiments have been described herein with reference to the accompanying drawings, it is to be understood that the example embodiments are intended to be illustrative only and are not intended to limit the scope of the application. Various modifications and changes can be made thereto by those of ordinary skill in the art without departing from the scope and spirit of the application. It is intended that all such modifications and changes be included within the scope of the application as claimed.

[0093] Those of ordinary skill in the art will realize that the exemplary units and algorithm steps described in connection with the embodiments disclosed herein can be implemented as electronic hardware, or a combination of computer software and electronic hardware. The choice of whether to implement the functionality described herein as a hardware or software implementation, or a combination of the two, can depend on the particular application and design constraints imposed on the overall system. Skilled artisans can implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

[0094] In several embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative, and the division of units is merely a logical functional division. In actual implementation, another division manner can be used, for example, a plurality of units or components can be combined or integrated into another device, or some features can be omitted or not implemented.

[0095] In the specification provided herein, a large number of specific details are described. However, it can be understood that the embodiments of the present application can be practiced without these specific details. In some examples, well-known methods, structures and techniques are not described in detail in order not to obscure the understanding of the specification.

[0096] Similarly, it is to be understood that, for brevity and clarity, terms of reference such as "one", "another", "at least one", "one or more" and "at least a first" can be used throughout the description in relation to various embodiments of the application, but each is to be understood as applying, where appropriate, to corresponding terms such as "one or more", "at least one" or "one or more of the same", or "at least a first" or "one or more of the first". In other words, the terms of reference are used interchangeably, as appropriate, and each is to be understood as applying to one or more, and vice versa.

[0097] Those skilled in the art will appreciate that all features described herein (including all features and processes described in the accompanying claims, abstract and drawings) can be combined in any combination. Each feature disclosed in this specification (including any "means for" function disclosed by the claims, abstract, and drawings) can be replaced by alternative features supporting the same, equivalent or similar purpose, unless expressly stated otherwise. Unless otherwise stated, each feature disclosed in this specification (including any "means for" function disclosed by the claims, abstract, and drawings) can be replaced by alternative features supporting the same, equivalent or similar purpose, unless expressly stated otherwise.

[0098] Furthermore, those skilled in the art will recognize that references in this specification to features, advantages, or characteristics of the application do not imply that the feature, advantage, or characteristic is essential to the application, and they will realize that non-essential features can be omitted or contributed to other implementations of the application. In addition, it will be recognized that features of different implementations can be combined in any combination, and that the scope of the application is not limited to features described in any particular implementation.

[0099] It is noted that the above-mentioned embodiments illustrate rather than limit the application, and that those skilled in the art will be able to design many alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps other than those listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The application can be implemented by means of both hardware and software, and any combination thereof. In a unitary claim, several devices or means can be listed, comprising means for performing a certain task. Unless otherwise explicitly provided, the devices or means can be implemented by one and the same hardware item. The word "first", "second", "third", etc. do not imply any order. The terms "first", "second", "third", etc. should be interpreted as names.

[0100] The above description is only specific embodiments of the present application, and the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present application, and all these changes or replacements should be covered within the protection scope of the present application. The protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A battery pack heating circuit, wherein, The first battery pack, the second battery pack, the first controller, the second controller and the first energy storage component are included, and the first energy storage component internally includes an inductor; The negative electrode of the first battery pack and the negative electrode of the second battery pack are connected; The first input end of the first controller is connected to the positive electrode of the first battery pack, and the second input end of the first controller is connected to the negative electrode of the first battery pack; The first output end of the second controller is connected to the positive electrode of the second battery pack, and the second output end of the second controller is connected to the negative electrode of the second battery pack; The input end of the first energy storage component is connected to the output end of the first controller, and the output end of the first energy storage component is connected to the input end of the second controller; When the battery pack heating circuit is in the first timing mode, the first battery pack discharges the inductor of the first energy storage component through the first controller and the second controller; When the battery pack heating circuit is in the second timing mode, the inductor of the first energy storage component charges the second battery pack through the first controller and the second controller.

2. The battery pack heating circuit of claim 1, wherein, The first energy storage component includes a first sub-energy storage component, the first sub-energy storage component internally includes an inductor, the input end of the first sub-energy storage component is connected to the output end of the first controller, and the output end of the first sub-energy storage component is connected to the input end of the second controller; or, The first energy storage component includes a first sub-energy storage component and a second sub-energy storage component, the first sub-energy storage component and the second sub-energy storage component internally include an inductor, the input end of the first sub-energy storage component is connected to the output end of the first controller, the input end of the second sub-energy storage component is connected to the output end of the first sub-energy storage component, and the output end of the second sub-energy storage component is connected to the input end of the second controller.

3. The battery pack heating circuit of claim 1 or 2, wherein, The first controller includes a first bridge arm component connected to the first input end and the second input end of the first controller respectively or a plurality of first bridge arm components connected in parallel between the first input end and the second input end of the first controller, each of the first bridge arm components includes a first bridge group and a second bridge group connected in series, the drain of the first bridge group is connected to the first input end of the first controller, and the source of the second bridge group is connected to the second input end of the first controller, the source of the first bridge group and the drain of the second bridge group in each of the first bridge arm components are connected in series and connected to an inductor of the first energy storage component; The second controller includes a second bridge arm assembly connected to the first output end and the second output end of the second controller respectively or a plurality of second bridge arm assemblies connected in parallel between the first output end and the second output end of the second controller, each of the second bridge arm assemblies includes a third bridge group and a fourth bridge group connected in series, the drain of the third bridge group is connected to the first output end of the second controller, the source of the fourth bridge group is connected to the second output end of the second controller, the source of the third bridge group and the drain of the fourth bridge group in each of the second bridge arm assemblies are connected in series and connected to one inductor of the first energy storage assembly.

4. The battery pack heating circuit of claim 3, wherein, When the battery pack heating circuit is in the first timing mode, the first controller controls the first bridge group in at least one of the first bridge arm assemblies to be on and the second bridge group to be off, and the second controller controls the fourth bridge group in at least one of the second bridge arm assemblies to be on and the third bridge group to be off, so that the first battery pack discharges the inductor of the first energy storage assembly through the first bridge group and the fourth bridge group.

5. The battery pack heating circuit of claim 4, wherein, When the battery pack heating circuit is in the second timing mode, the first controller controls the second bridge group in at least one of the first bridge arm assemblies to be on and the first bridge group to be off, and the second controller controls the third bridge group in at least one of the second bridge arm assemblies to be on and the fourth bridge group to be off, so that the inductor of the first energy storage assembly charges the second battery pack through the second bridge group and the third bridge group.

6. The battery pack heating circuit of any one of claims 3-5, wherein, The first bridge group, the second bridge group, the third bridge group and the fourth bridge group each include an insulated gate bipolar transistor.

7. The battery pack heating circuit of any one of claims 2-6, wherein, The first sub-energy storage assembly and the second sub-energy storage assembly each are a driving motor, the inductor of the first sub-energy storage assembly and the inductor of the second sub-energy storage assembly each are a winding of the driving motor, and the first controller and the second controller each are a motor controller.

8. The battery pack heating circuit of any one of claims 1-7, wherein, The battery pack heating circuit further includes a first capacitor and a second capacitor, the first capacitor is connected in parallel between the first input end and the second input end of the first controller, and the second capacitor is connected in parallel between the first output end and the second output end of the second controller.

9. A battery pack heating circuit, wherein, The battery pack heating circuit further includes a first capacitor and a second capacitor, the first capacitor is connected in parallel between the first input end and the second input end of the first controller, and the second capacitor is connected in parallel between the first output end and the second output end of the second controller. The battery pack heating circuit further includes a first capacitor and a second capacitor, the first capacitor is connected in parallel between the first input end and the second input end of the first controller, and the second capacitor is connected in parallel between the first output end and the second output end of the second controller. The first input end of the first controller is connected to the positive electrode of the first battery pack, and the second input end of the first controller is connected to the negative electrode of the first battery pack. The first input end of the first controller is connected to the positive electrode of the first battery pack, and the second input end of the first controller is connected to the negative electrode of the first battery pack. The first input end of the first controller is connected to the positive electrode of the first battery pack, and the second input end of the first controller is connected to the negative electrode of the first battery pack. The first input end of the first controller is connected to the positive electrode of the first battery pack, and the second input end of the first controller is connected to the negative electrode of the first battery pack. The first output end of the third controller is connected to the positive electrode of the first battery pack, and the second output end of the third controller is connected to the negative electrode of the first battery pack; The first input end of the fourth controller is connected to the positive electrode of the second battery pack, and the second input end of the fourth controller is connected to the negative electrode of the second battery pack; The input end of the second energy storage assembly is connected to the output end of the fourth controller, and the output end of the second energy storage assembly is connected to the input end of the third controller; When the battery pack heating circuit is in the first timing mode, the first battery pack discharges the inductance of the first energy storage assembly and the inductance of the second energy storage assembly through the first controller, the second controller, the third controller and the fourth controller; When the battery pack heating circuit is in the second timing mode, the inductance of the first energy storage assembly and the inductance of the second energy storage assembly charge the second battery pack through the first controller, the second controller, the third controller and the fourth controller.

10. The battery pack heating circuit of claim 9, wherein, The first energy storage assembly includes a first sub-energy storage assembly, or includes a first sub-energy storage assembly and a second sub-energy storage assembly; The second energy storage assembly includes a third sub-energy storage assembly, or includes a third sub-energy storage assembly and a fourth sub-energy storage assembly; When the first energy storage assembly includes the first sub-energy storage assembly, the first sub-energy storage assembly internally includes an inductance, the input end of the first sub-energy storage assembly is connected to the output end of the first controller, and the output end of the first sub-energy storage assembly is connected to the input end of the second controller; When the first energy storage assembly includes the first sub-energy storage assembly and the second sub-energy storage assembly, the first sub-energy storage assembly and the second sub-energy storage assembly both internally include an inductance, the input end of the first sub-energy storage assembly is connected to the output end of the first controller, the input end of the second sub-energy storage assembly is connected to the output end of the first sub-energy storage assembly, and the output end of the second sub-energy storage assembly is connected to the input end of the second controller; When the second energy storage assembly includes the third sub-energy storage assembly, the third sub-energy storage assembly internally includes an inductance, the output end of the third sub-energy storage assembly is connected to the input end of the third controller, and the input end of the third sub-energy storage assembly is connected to the output end of the fourth controller; When the second energy storage assembly includes the third sub-energy storage assembly and the fourth sub-energy storage assembly, the third sub-energy storage assembly and the fourth sub-energy storage assembly both internally include an inductance, the output end of the third sub-energy storage assembly is connected to the input end of the third controller, the input end of the third sub-energy storage assembly is connected to the output end of the fourth sub-energy storage assembly, and the input end of the fourth sub-energy storage assembly is connected to the output end of the fourth controller.

11. The battery pack heating circuit according to claim 9 or 10, wherein, The first controller includes a first bridge leg assembly connected to the first input and the second input of the first controller or a plurality of first bridge leg assemblies connected in parallel between the first input and the second input of the first controller, each of the first bridge leg assemblies including a first bridge group and a second bridge group connected in series, the drain of the first bridge group connected to the first input of the first controller, the source of the second bridge group connected to the second input of the first controller, the source of the first bridge group and the drain of the second bridge group in each of the first bridge leg assemblies connected in series and connected to an inductor of the first energy storage assembly; The second controller includes a second bridge leg assembly connected to the first output and the second output of the second controller or a plurality of second bridge leg assemblies connected in parallel between the first output and the second output of the second controller, each of the second bridge leg assemblies including a third bridge group and a fourth bridge group connected in series, the drain of the third bridge group connected to the first output of the second controller, the source of the fourth bridge group connected to the second output of the second controller, the source of the third bridge group and the drain of the fourth bridge group in each of the second bridge leg assemblies connected in series and connected to an inductor of the first energy storage assembly; The third controller includes a third bridge leg assembly connected to the first output and the second output of the third controller or a plurality of third bridge leg assemblies connected in parallel between the first output and the second output of the third controller, each of the third bridge leg assemblies including a fifth bridge group and a sixth bridge group connected in series, the drain of the fifth bridge group connected to the first output of the third controller, the source of the sixth bridge group connected to the second output of the third controller, the source of the fifth bridge group and the drain of the sixth bridge group in each of the third bridge leg assemblies connected in series and connected to an inductor of the second energy storage assembly; The fourth controller includes a fourth bridge leg assembly connected to the first input and the second input of the fourth controller or a plurality of fourth bridge leg assemblies connected in parallel between the first input and the second input of the fourth controller, each of the fourth bridge leg assemblies including a seventh bridge group and an eighth bridge group connected in series, the drain of the seventh bridge group connected to the first input of the fourth controller, the source of the eighth bridge group connected to the second input of the fourth controller, the source of the seventh bridge group and the drain of the eighth bridge group in each of the fourth bridge leg assemblies connected in series and connected to an inductor of the second energy storage assembly.

12. The battery pack heating circuit of claim 11, wherein, When the battery pack heating circuit is in the first timing mode, the first controller controls the first bridge group in the at least one first bridge arm assembly to be turned on, the second bridge group to be turned off, the second controller controls the third bridge group in the at least one second bridge arm assembly to be turned on, the fourth bridge group to be turned off, the third controller controls the fifth bridge group in the at least one fourth bridge arm assembly to be turned off, the sixth bridge group to be turned on, and the fourth controller controls the seventh bridge group in the at least one fifth bridge arm assembly to be turned off, the eighth bridge group to be turned on, so that the first battery pack discharges the inductance of the first energy storage assembly and the inductance of the second energy storage assembly through the first bridge group, the fourth bridge group, the sixth bridge group and the eighth bridge group.

13. The battery pack heating circuit of claim 12, wherein, When the battery pack heating circuit is in the second timing mode, the first controller controls the second bridge group in the at least one first bridge arm assembly to be turned on, the first bridge group to be turned off, the second controller controls the third bridge group in the at least one second bridge arm assembly to be turned on, the fourth bridge group to be turned off, the third controller controls the fifth bridge group in the at least one fourth bridge arm assembly to be turned off, the sixth bridge group to be turned on, and the fourth controller controls the seventh bridge group in the at least one fifth bridge arm assembly to be turned off, the eighth bridge group to be turned on, so that the inductance of the first energy storage assembly and the inductance of the second energy storage assembly charge the second battery pack through the second bridge group, the third bridge group, the sixth bridge group and the eighth bridge group.

14. The battery pack heating circuit of any one of claims 11-13, wherein, The first bridge group, the second bridge group, the third bridge group, the fourth bridge group, the fifth bridge group, the sixth bridge group, the seventh bridge group and the eighth bridge group each include an insulated gate bipolar transistor.

15. The battery pack heating circuit according to any one of claims 10-14, wherein, The first sub-energy storage assembly and the second sub-energy storage assembly are each a drive motor, the inductance of the first sub-energy storage assembly and the inductance of the second sub-energy storage assembly are each a winding of the drive motor, and the first controller and the second controller are each a motor controller. The third sub-energy storage assembly and the fourth sub-energy storage assembly are each a compressor, the inductance of the third sub-energy storage assembly and the inductance of the fourth sub-energy storage assembly are each a winding of the compressor, and the third controller and the fourth controller are each a compressor controller.

16. The battery pack heating circuit of any one of claims 9-15, wherein, The battery pack heating circuit further includes a first capacitor, a second capacitor, a third capacitor and a fourth capacitor, the first capacitor is connected in parallel between the first input terminal and the second input terminal of the first controller, the second capacitor is connected in parallel between the first output terminal and the second output terminal of the second controller, the third capacitor is connected in parallel between the first output terminal and the second output terminal of the third controller, and the fourth capacitor is connected in parallel between the first input terminal and the second input terminal of the fourth controller.

17. An energy storage cabinet, wherein, The energy storage cabinet includes the battery pack heating circuit according to any one of claims 1-8, or the battery pack heating circuit according to any one of claims 9-16.

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