Charging and discharging circuit, and vehicle

Abstract

The present disclosure relates to a charging and discharging circuit, and a vehicle. The charging and discharging circuit comprises a controller, and a first charging and discharging interface, a battery module, a target electric motor and electronic control assembly, and a target switch, which are connected to the controller, wherein one end of the target switch is connected to the battery module, and the other end of the target switch is connected to the target electric motor and electronic control assembly; the target electric motor and electronic control assembly is further connected to the first charging and discharging interface; the first charging and discharging interface is used for connecting to a first target device; and the controller is used for controlling, on the basis of a first charging and discharging request, the target switch to be closed, and controlling the target electric motor and electronic control assembly to form a charging path or a discharging path along with the battery module and the first target device. In this way, by means of forming a charging path or a discharging path adapted to a battery module, the problem of a first target device being unable to be charged due to the fact that the first target device is not adapted to the battery module can be effectively avoided, and the flexibility of charging and discharging of vehicles can also be effectively improved, thereby facilitating an improvement in the experience and degree of satisfaction of users.

Description

Charging and discharging circuit and vehicle

[0001] Cross Reference to Related Applications

[0002] The present disclosure claims priority to the Chinese patent application No. 202410980248.2, filed on July 22, 2024, and entitled "Charging and discharging circuit and vehicle", the entire content of which is incorporated herein by reference. TECHNICAL FIELD

[0003] The present disclosure relates to the field of new energy vehicle technology, in particular, to a charging and discharging circuit and a vehicle. BACKGROUND

[0004] At present, most charging facilities are fixedly installed in a place, and the output voltage range is relatively fixed. However, the charging parameters (such as charging voltage, charging current, power, etc.) of different types of electric vehicles are often different. When charging different charging demand electric vehicles through charging facilities with a relatively fixed output voltage range, it will not be able to charge the electric vehicles due to the mismatch between the charging facility and the required charging parameters of the vehicle. And because the charging facility is fixedly installed in a place, when facing some unexpected situations, such as the electric vehicle running out of power before reaching the fixed charging pile; or in remote areas, the distribution of charging stations is not dense enough, and the driver has difficulty in finding a charging station, it is more likely to appear the situation that the vehicle cannot be charged. SUMMARY

[0005] The purpose of the present disclosure is to provide a charging and discharging circuit and a vehicle.

[0006] In order to achieve the above purpose, according to a first aspect of an embodiment of the present disclosure, a charging and discharging circuit is provided,

[0007] The charging and discharging circuit comprises a controller, a first charging and discharging interface connected with the controller, a battery module, a target motor electronic control assembly and a target switch, one end of the target switch is connected with the battery module, the other end of the target switch is connected with the target motor electronic control assembly, the target motor electronic control assembly is further connected with the first charging and discharging interface, and the first charging and discharging interface is used for connecting a first target device.

[0008] The controller is configured to control the target switch to be closed and control the target motor electronic control assembly to form a charging path or a discharging path with the battery module and the first target device according to a first charging and discharging request.

[0009] Optionally, the target motor electronic control assembly comprises one or more target bridge arm conversion circuits, each target bridge arm conversion circuit comprises a target bridge arm and a target winding.

[0010] The first end of the target winding is connected to the midpoint of the target bridge arm, the second end of the target winding is connected to the battery module through the target switch, and the bus end of the target bridge arm is connected to the charging interface.

[0011] Optionally, the target motor electronic control assembly comprises one or more target bridge arm conversion circuits, each of which comprises a target bridge arm and a target winding.

[0012] The first end of the target winding is connected to the midpoint of the target bridge arm, the second end of the target winding is connected to the battery module through the target switch, and the bus end of the target bridge arm is connected to the first charging and discharging interface.

[0013] Optionally, the controller is configured to determine at least one specified bridge arm conversion circuit from the one or more target bridge arm conversion circuits according to the first charging and discharging request, and form a charging path or a discharging path between the target switch, the battery module and the first target device through the specified bridge arm conversion circuit.

[0014] Optionally, when the first charging and discharging request is a first step-down charging request, the controller is configured to control the target switch to be turned on and the upper bridge arm of the target bridge arm in the specified bridge arm conversion circuit to be turned on in a first specified time period of each first control period, so as to form a first step-down charging path between the first target device, the upper bridge arm in the specified bridge arm conversion circuit, the target winding in the specified bridge arm conversion circuit, the target switch and the battery module, and charge the target winding in the specified bridge arm conversion circuit and the battery module by the charging device.

[0015] Optionally, the controller is further configured to control the target switch to be turned on and the upper bridge arm of the target bridge arm in the specified bridge arm conversion circuit to be turned off and the lower bridge arm of the target bridge arm in the specified bridge arm conversion circuit to be turned on in a second specified time period of each first control period, so as to form a second step-down charging path between the target winding in the specified bridge arm conversion circuit, the target switch, the battery module and the lower bridge arm of the target bridge arm in the specified bridge arm conversion circuit, and charge the battery module by the target winding in the specified bridge arm conversion circuit.

[0016] Optionally, the controller is configured to, in a case that the first charge-discharge request is a first boost discharge request, control the target switch to be closed, a lower bridge arm of the target bridge arm in the specified bridge arm conversion circuit to be turned on, and a first path between the battery module, the target switch, the target winding in the specified bridge arm conversion circuit, and the lower bridge arm in the specified bridge arm conversion circuit to be formed, so as to cause the battery module to discharge the target winding in the specified bridge arm conversion circuit.

[0017] Optionally, the controller is further configured to, in each second control period, control the target switch to be closed, an upper bridge arm of the target bridge arm in the specified bridge arm conversion circuit to be turned on, and a lower bridge arm of the target bridge arm in the specified bridge arm conversion circuit to be turned off, and a first boost discharge path between the battery module, the target switch, the target winding in the specified bridge arm conversion circuit, the upper bridge arm of the target bridge arm in the specified bridge arm conversion circuit, and the first target device to be formed, so as to cause the battery module and the target winding in the specified bridge arm conversion circuit to discharge the first target device.

[0018] Optionally, the charge-discharge circuit further comprises a first switch,

[0019] a first end of the first switch is connected with a second end of the target winding, and a second end of the first switch is connected with the first charge-discharge interface.

[0020] Optionally, the controller is configured to, in a case that the first charge-discharge request is a first boost discharge request, control the target switch to be closed, a lower bridge arm of the target bridge arm in the specified bridge arm conversion circuit to be turned on, and a first path between the battery module, the target switch, the target winding in the specified bridge arm conversion circuit, and the lower bridge arm in the specified bridge arm conversion circuit to be formed, so as to cause the battery module to discharge the target winding in the specified bridge arm conversion circuit.

[0021] Optionally, the controller is further configured to, in each second control period, control the target switch to be closed, an upper bridge arm of the target bridge arm in the specified bridge arm conversion circuit to be turned on, and a lower bridge arm of the target bridge arm in the specified bridge arm conversion circuit to be turned off, and a first boost discharge path between the battery module, the target switch, the target winding in the specified bridge arm conversion circuit, the upper bridge arm of the target bridge arm in the specified bridge arm conversion circuit, and the first target device to be formed, so as to cause the battery module and the target winding in the specified bridge arm conversion circuit to discharge the first target device.

[0022] Optionally, the controller is configured to, in the case that the first charge-discharge request is a second step-down charging request, control the target switch to be closed, the first switch to be opened, and an upper bridge arm of a target bridge arm in the specified bridge-leg conversion circuit to be turned on in a first specified time period of each fourth control period, so as to form a third step-down charging path between the first target device and the target winding in the specified bridge-leg conversion circuit, the battery module, the target switch, and the upper bridge arm of the target bridge arm in the specified bridge-leg conversion circuit, so that the first target device charges the target winding in the specified bridge-leg conversion circuit and the battery module.

[0023] Optionally, the controller is further configured to, in the case that the first charge-discharge request is a second step-down charging request, control the target switch to be closed, the first switch to be opened, and an upper bridge arm of a target bridge arm in the specified bridge-leg conversion circuit to be turned on in a first specified time period of each fourth control period, so as to form a third step-down charging path between the first target device and the target winding in the specified bridge-leg conversion circuit, the battery module, the target switch, and the upper bridge arm of the target bridge arm in the specified bridge-leg conversion circuit, so that the first target device charges the target winding in the specified bridge-leg conversion circuit and the battery module.

[0024] Optionally, the controller is configured to, in the case that the first charge-discharge request is a second step-up discharging request, control the target switch to be closed, the first switch to be opened, and a lower bridge arm of a target bridge arm in the specified bridge-leg conversion circuit to be turned on in a first specified time period of each fifth control period, so as to form a third path between the battery module, the target switch, the target winding in the specified bridge-leg conversion circuit, and the lower bridge arm in the specified bridge-leg conversion circuit, so that the battery module discharges the target winding in the specified bridge-leg conversion circuit.

[0025] Optionally, the controller is further configured to, in the case that the first charge-discharge request is a second step-up discharging request, control the target switch to be closed, the first switch to be opened, and a lower bridge arm of a target bridge arm in the specified bridge-leg conversion circuit to be turned on in a first specified time period of each fifth control period, so as to form a third path between the battery module, the target switch, the target winding in the specified bridge-leg conversion circuit, and the lower bridge arm in the specified bridge-leg conversion circuit, so that the battery module discharges the target winding in the specified bridge-leg conversion circuit.

[0026] Optionally, the controller is configured to, in the case that the first charge-discharge request is a first step-down discharge request, control the first switch to be closed, the target switch to be opened, an upper bridge arm of a target bridge arm in the specified bridge-leg conversion circuit to be turned on, to form a first step-down discharge path between the battery module, the upper bridge arm of the target bridge arm in the specified bridge-leg conversion circuit, a target winding in the specified bridge-leg conversion circuit, the first switch, and the first target device, so that the battery module discharges the target winding in the specified bridge-leg conversion circuit and the first target device.

[0027] Optionally, the controller is further configured to, in the second specified time period of each sixth control period, control the first switch to be closed, the target switch to be opened, the upper bridge arm of the target bridge arm in the specified bridge-leg conversion circuit to be turned off, and a lower bridge arm of the target bridge arm in the specified bridge-leg conversion circuit to be turned on, to form a second step-down discharge path between the target winding in the specified bridge-leg conversion circuit, the first switch, the first target device, and the lower bridge arm of the target bridge arm in the specified bridge-leg conversion circuit, so that the target winding in the specified bridge-leg conversion circuit charges the first target device.

[0028] Optionally, the charge-discharge circuit further comprises a first motor control assembly, a second charge-discharge interface, one end of the first motor control assembly being connected to the second charge-discharge interface, and the other end being connected to the battery module, the second charge-discharge interface being configured to be connected to a second target device,

[0029] The controller is further configured to, according to a second charge-discharge request, control the first motor control assembly to form a charging path or a discharging path with the battery module and the second target device.

[0030] Optionally, the charge-discharge circuit further comprises a second switch and a third switch,

[0031] The first motor control assembly comprises one or more first bridge-leg conversion circuits, and each first bridge-leg conversion circuit comprises a first bridge arm and a first winding.

[0032] For each first bridge-leg conversion circuit, a first end of the first winding is connected to a midpoint of the first bridge arm, a second end of the first winding is connected to the second charge-discharge interface, a confluence end of the first bridge arm is connected to a positive electrode of the battery module through the second switch, and the confluence end of the first bridge arm is further connected to a negative electrode of the battery module through the third switch.

[0033] Optionally, the controller is configured to determine at least one first target bridge leg conversion circuit from the one or more first bridge leg conversion circuits according to a second charge-discharge request of the second target device after determining that the battery module is high-voltage powered, and form a charging path or a discharging path between the first target bridge leg conversion circuit and the battery module and the second target device.

[0034] Optionally, the controller is configured to control the target switch to be off, the second switch and the third switch to be on, and an upper bridge leg of the first bridge leg in the first target bridge leg conversion circuit to be on to form a fourth path between the second target device and a first winding in the first target bridge leg conversion circuit and the upper bridge leg of the first bridge leg in the first target bridge leg conversion circuit to charge the first winding in the first target bridge leg conversion circuit in a first specified time period of each seventh control period when the second charge-discharge request is a second step-up charging request.

[0035] Optionally, the controller is configured to control the target switch to be off, the second switch and the third switch to be on, and an upper bridge leg of the first bridge leg in the first target bridge leg conversion circuit to be on to form a fourth path between the second target device and a first winding in the first target bridge leg conversion circuit and the upper bridge leg of the first bridge leg in the first target bridge leg conversion circuit to charge the first winding in the first target bridge leg conversion circuit in a first specified time period of each seventh control period when the second charge-discharge request is a second step-up charging request.

[0036] Optionally, the controller is configured to control the target switch to be off, the second switch and the third switch to be on, and an upper bridge leg of the first bridge leg in the first target bridge leg conversion circuit to be on to form a fourth path between the second target device and a first winding in the first target bridge leg conversion circuit and the upper bridge leg of the first bridge leg in the first target bridge leg conversion circuit to charge the first winding in the first target bridge leg conversion circuit in a first specified time period of each seventh control period when the second charge-discharge request is a second step-up charging request.

[0037] Optionally, the controller is further configured to control, in a second specified time period of each eighth control period, the target switch, the second switch and the third switch to be turned off, the upper bridge arm of the first bridge arm in the first target bridge arm conversion circuit to be turned off, the lower bridge arm of the first bridge arm in the first target bridge arm conversion circuit to be turned on, so as to form a fourth step-down discharge path between the first winding in the first target bridge arm conversion circuit and the second target device and the lower bridge arm of the first bridge arm in the first target bridge arm conversion circuit, so as to discharge the first winding in the first target bridge arm conversion circuit to the second target device.

[0038] Optionally, the charge and discharge circuit further comprises a second motor control assembly and a fourth switch, one end of the second motor control assembly is connected with the first motor control assembly through the fourth switch, and the other end of the second motor control assembly is connected with the battery module,

[0039] The controller is further configured to control, according to the second charge and discharge request, the second motor control assembly to form a charging path or a discharging path with the battery module and the second target device.

[0040] Optionally, the second motor control assembly comprises one or more second bridge arm conversion circuits, and each second bridge arm conversion circuit comprises a second bridge arm and a second winding.

[0041] For each second bridge arm conversion circuit, a first end of the second winding is connected with a midpoint of the second bridge arm, a second end of the second winding is connected with the second end of the first winding through the fourth switch, and a bus end of the second bridge arm is connected with a bus end of the first bridge arm through the second switch and the third switch.

[0042] Optionally, the controller is configured to determine, according to the second charge and discharge request of the second target device, at least one second target bridge arm conversion circuit from the one or more second bridge arm conversion circuits, and form a charging path or a discharging path between the battery module and the second target device through the second target bridge arm conversion circuit.

[0043] Optionally, when the second charge and discharge request is a third step-up charging request, the controller is configured to control, in a first specified time period of each ninth control period, the third switch and the fourth switch to be turned on, the target switch and the second switch to be turned off, and the lower bridge arm of the second bridge arm in the second target bridge arm conversion circuit to be turned on, so as to form a fifth path between the second target device, the fourth switch, the second winding in the second target bridge arm conversion circuit, the lower bridge arm of the second bridge arm in the second target bridge arm conversion circuit and the third switch, so as to charge the second winding in the second target bridge arm conversion circuit by the second target device.

[0044] Optionally, the controller is further configured to control, in the second specified time period of each ninth control period, the third switch and the fourth switch to be closed, the target switch and the second switch to be open, the upper bridge arm of the second bridge arm in the second target bridge arm conversion circuit to be turned on, and the lower bridge arm of the second bridge arm in the second target bridge arm conversion circuit to be turned off, so as to form a third boost charging path between the second target device and the fourth switch, the second winding in the second target bridge arm conversion circuit, the upper bridge arm of the second bridge arm in the second target bridge arm conversion circuit, the battery module, and the third switch, so that the second target device and the second winding in the second target bridge arm conversion circuit charge the battery module.

[0045] Optionally, the controller is configured to, in the case that the second charge-discharge request is a third step-down discharge request, control, in the first specified time period of each tenth control period, the third switch and the fourth switch to be closed, the target switch and the second switch to be open, and the upper bridge arm of the second bridge arm in the second target bridge arm conversion circuit to be turned on, so as to form a fifth step-down discharge path between the battery module and the upper bridge arm of the second bridge arm in the second target bridge arm conversion circuit, the second winding in the second target bridge arm conversion circuit, the fourth switch, the second target device, and the third switch, so that the battery module discharges the second winding in the second target bridge arm conversion circuit and the second target device.

[0046] Optionally, the controller is further configured to control, in the second specified time period of each tenth control period, the third switch and the fourth switch to be closed, the target switch and the second switch to be open, the upper bridge arm of the second bridge arm in the second target bridge arm conversion circuit to be turned off, and the lower bridge arm of the second bridge arm in the second target bridge arm conversion circuit to be turned on, so as to form a sixth step-down discharge path between the second winding in the second target bridge arm conversion circuit and the fourth switch, the second target device, the third switch, and the lower bridge arm of the second bridge arm in the second target bridge arm conversion circuit, so that the second winding in the second target bridge arm conversion circuit discharges the second target device.

[0047] Optionally, the controller is configured to, in the case that the current temperature of the battery module is less than or equal to a preset temperature threshold, control the first target bridge arm conversion circuit and / or the second target bridge arm conversion circuit to form a self-heating path with the battery module, so as to heat the battery module.

[0048] Optionally, the controller is configured to, according to the first self-heating request, determine, in a first specified time period of each first self-heating control period, a first standby bridge arm conversion circuit and a second standby bridge arm conversion circuit from the plurality of first bridge arm conversion circuits, and control the target switch and the fourth switch to be off, the second switch and the third switch to be on, an upper bridge arm of a first bridge arm in the first standby bridge arm conversion circuit to be on, and a lower bridge arm of the first bridge arm in the second standby bridge arm conversion circuit to be on, so as to form a first self-heating path between the battery module, the upper bridge arm of the first bridge arm in the first standby bridge arm conversion circuit, a first winding in the first standby bridge arm conversion circuit, a first winding in the second standby bridge arm conversion circuit, the lower bridge arm of the first bridge arm in the second standby bridge arm conversion circuit, and the third switch, and heat the battery module.

[0049] Optionally, the controller is further configured to, in a second specified time period of each first self-heating control period, control the target switch and the fourth switch to be off, the second switch and the third switch to be on, the upper bridge arm of the first bridge arm in the first standby bridge arm conversion circuit to be off, the lower bridge arm of the first bridge arm in the first standby bridge arm conversion circuit to be on, the upper bridge arm of the first bridge arm in the second standby bridge arm conversion circuit to be on, and the lower bridge arm of the first bridge arm in the second standby bridge arm conversion circuit to be off, so as to form a second self-heating path between the first winding in the first standby bridge arm conversion circuit, the first winding in the second standby bridge arm conversion circuit, the upper bridge arm of the first bridge arm in the second standby bridge arm conversion circuit, the second switch, the battery module, the third switch, and the lower bridge arm of the first bridge arm in the first standby bridge arm conversion circuit, and heat the battery module.

[0050] Optionally, the controller is configured to, according to the second self-heating request, determine, in a first specified time period of each second self-heating control period, a first preset bridge arm conversion circuit and a second preset bridge arm conversion circuit from the plurality of second bridge arm conversion circuits, and control the target switch, the second switch, the third switch, and the fourth switch to be off, an upper bridge arm of a second bridge arm in the first preset bridge arm conversion circuit to be on, and a lower bridge arm of the second bridge arm in the second preset bridge arm conversion circuit to be on, so as to form a third self-heating path between the battery module, the upper bridge arm of the second bridge arm in the first preset bridge arm conversion circuit, a second winding in the first preset bridge arm conversion circuit, a second winding in the second preset bridge arm conversion circuit, and the lower bridge arm of the second bridge arm in the second preset bridge arm conversion circuit, and heat the battery module.

[0051] Optionally, the controller is further configured to control, in a second designated time period of each second self-heating control period, the target switch, the second switch, the third switch and the fourth switch to be turned off, an upper bridge arm of a second bridge arm in the first preset bridge arm conversion circuit to be turned off, a lower bridge arm of the second bridge arm in the first preset bridge arm conversion circuit to be turned on, an upper bridge arm of a second bridge arm in the second preset bridge arm conversion circuit to be turned on, a lower bridge arm of the second bridge arm in the second preset bridge arm conversion circuit to be turned off, to form a fourth self-heating path between the second winding in the first preset bridge arm conversion circuit, the second winding in the second preset bridge arm conversion circuit, the upper bridge arm of the second bridge arm in the second preset bridge arm conversion circuit, the battery module, and the lower bridge arm of the second bridge arm in the first preset bridge arm conversion circuit, so as to heat the battery module.

[0052] Optionally, the controller is configured to, according to a third self-heating request, control, in a first designated time period of each third self-heating control period, the target switch and the second switch to be turned off, the third switch and the fourth switch to be turned on, a lower bridge arm of a first bridge arm in the first target bridge arm conversion circuit to be turned on, and an upper bridge arm of a second bridge arm in the second target bridge arm conversion circuit to be turned on, to form a fifth self-heating path between the battery module, the upper bridge arm of the second bridge arm in the second target bridge arm conversion circuit, a second winding in the second target bridge arm conversion circuit, the fourth switch, a first winding in the first target bridge arm conversion circuit, the lower bridge arm of the first bridge arm in the first target bridge arm conversion circuit, and the third switch, so as to heat the battery module.

[0053] Optionally, the controller is further configured to, in a second designated time period of each third self-heating control period, control the target switch and the third switch to be turned off, the second switch and the fourth switch to be turned on, and control an upper bridge arm of a first bridge arm in the first target bridge arm conversion circuit to be turned on, a lower bridge arm of the first bridge arm in the first target bridge arm conversion circuit to be turned off, an upper bridge arm of a second bridge arm in the second target bridge arm conversion circuit to be turned off, and a lower bridge arm of the second bridge arm in the second target bridge arm conversion circuit to be turned on, to form a sixth self-heating path between the first winding in the first target bridge arm conversion circuit and the upper bridge arm of the first bridge arm in the first target bridge arm conversion circuit, the second switch, the battery module, the lower bridge arm of the second bridge arm in the second target bridge arm conversion circuit, the second winding in the second target bridge arm conversion circuit, and the fourth switch, so as to heat the battery module.

[0054] Optionally, the controller is configured to control, according to a fourth self-heating request, the target switch and the third switch to be turned off, the second switch and the fourth switch to be turned on, the upper bridge arm of the first bridge arm in the first target bridge arm conversion circuit to be turned on, and the lower bridge arm of the second bridge arm in the second target bridge arm conversion circuit to be turned on, to form a seventh self-heating path between the battery module, the second switch, the upper bridge arm of the first bridge arm in the first target bridge arm conversion circuit, the first winding in the first target bridge arm conversion circuit, the second winding in the second target bridge arm conversion circuit, the fourth switch, and the lower bridge arm of the second bridge arm in the second target bridge arm conversion circuit, to heat the battery module.

[0055] Optionally, the controller is further configured to control, in a second specified time period of each fourth self-heating control period, the target switch and the second switch to be turned off, the third switch and the fourth switch to be turned on, the upper bridge arm of the first bridge arm in the first target bridge arm conversion circuit to be turned off, the lower bridge arm of the first bridge arm in the first target bridge arm conversion circuit to be turned on, the upper bridge arm of the second bridge arm in the second target bridge arm conversion circuit to be turned on, and the lower bridge arm of the second bridge arm in the second target bridge arm conversion circuit to be turned off, to form an eighth self-heating path between the third switch, the fourth switch, the first winding in the first target bridge arm conversion circuit, the second winding in the second target bridge arm conversion circuit, the upper bridge arm of the second bridge arm in the second target bridge arm conversion circuit, the battery module, and the lower bridge arm of the first bridge arm in the first target bridge arm conversion circuit, to heat the battery module.

[0056] According to a second aspect of the embodiments of the present disclosure, a vehicle is provided, which comprises the charging and discharging circuit of the first aspect.

[0057] The above technical solution can form a charging path or a discharging path matched with the battery module according to the first charging and discharging request of the different first target device, can effectively avoid the problem that the first target device cannot be charged due to the incompatibility between the first target device and the battery module, and can effectively improve the flexibility of charging and discharging of the vehicle, thereby facilitating the improvement of the experience and satisfaction of the user.

[0058] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF DRAWINGS

[0059] The accompanying drawings are included to provide a further understanding of the present disclosure and constitute a part of the specification, illustrate the present disclosure and, together with the specific embodiments described below, serve to explain the present disclosure, but do not constitute a limitation of the present disclosure. The drawings are as follows.

[0060] Fig. 1 is a circuit diagram of a charge-discharge circuit according to a first embodiment of the present disclosure;

[0061] Fig. 2 is a circuit diagram of a charge-discharge circuit according to a second embodiment of the present disclosure;

[0062] Fig. 3 is a circuit diagram of a charge-discharge circuit according to the embodiment shown in Fig. 2;

[0063] Fig. 4 is a circuit diagram of a charge-discharge circuit according to the embodiment shown in Fig. 3;

[0064] Fig. 5 is a circuit diagram of a charge-discharge circuit according to a third embodiment of the present disclosure;

[0065] Fig. 6 is a circuit diagram of a charge-discharge circuit according to a fourth embodiment of the present disclosure;

[0066] Fig. 7 is a circuit diagram of a charge-discharge circuit according to a fifth embodiment of the present disclosure;

[0067] Fig. 8 is a circuit diagram of a charge-discharge circuit according to a sixth embodiment of the present disclosure;

[0068] Fig. 9 is a circuit diagram of a charge-discharge circuit according to a seventh embodiment of the present disclosure;

[0069] Fig. 10 is a circuit diagram of a charge-discharge circuit according to an eighth embodiment of the present disclosure;

[0070] Fig. 11 is a circuit diagram of a charge-discharge circuit according to a ninth embodiment of the present disclosure;

[0071] Fig. 12 is a circuit diagram of a charge-discharge circuit according to a tenth embodiment of the present disclosure;

[0072] Fig. 13 is a circuit diagram of a charge-discharge circuit according to an eleventh embodiment of the present disclosure;

[0073] Fig. 14 is a circuit diagram of a charge-discharge circuit according to a twelfth embodiment of the present disclosure;

[0074] Fig. 15 is a circuit diagram of a charge-discharge circuit according to a thirteenth embodiment of the present disclosure;

[0075] Fig. 16 is a circuit diagram of a charge-discharge circuit according to a fourteenth embodiment of the present disclosure;

[0076] Fig. 17 is a circuit diagram of a charge-discharge circuit according to a fifteenth embodiment of the present disclosure;

[0077] FIG. 18 is a circuit diagram of a charge-discharge circuit according to a sixteenth embodiment of the present disclosure;

[0078] FIG. 19 is a circuit diagram of a charge-discharge circuit according to a seventeenth embodiment of the present disclosure;

[0079] FIG. 20 is a circuit diagram of a charge-discharge circuit according to an eighteenth embodiment of the present disclosure;

[0080] FIG. 21 is a circuit diagram of a charge-discharge circuit according to a nineteenth embodiment of the present disclosure;

[0081] FIG. 22 is a circuit diagram of a charge-discharge circuit according to a twentieth embodiment of the present disclosure;

[0082] FIG. 23 is a circuit diagram of a charge-discharge circuit according to a twenty-first embodiment of the present disclosure;

[0083] FIG. 24 is a circuit diagram of a charge-discharge circuit according to a twenty-second embodiment of the present disclosure;

[0084] FIG. 25 is a circuit diagram of a charge-discharge circuit according to a twenty-third embodiment of the present disclosure;

[0085] FIG. 26 is a circuit diagram of a charge-discharge circuit according to a twenty-fourth embodiment of the present disclosure;

[0086] FIG. 27 is a circuit diagram of a charge-discharge circuit according to a twenty-fifth embodiment of the present disclosure;

[0087] FIG. 28 is a circuit diagram of a charge-discharge circuit according to a twenty-sixth embodiment of the present disclosure;

[0088] FIG. 29 is a circuit diagram of a charge-discharge circuit according to a twenty-seventh embodiment of the present disclosure;

[0089] FIG. 30 is a circuit diagram of a charge-discharge circuit according to a twenty-eighth embodiment of the present disclosure;

[0090] FIG. 31 is a circuit diagram of a charge-discharge circuit according to a twenty-ninth embodiment of the present disclosure;

[0091] FIG. 32 is a block diagram of a vehicle according to an example embodiment. DETAILED DESCRIPTION

[0092] The specific embodiments of the present disclosure will be described below in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely intended to illustrate and explain the present disclosure, and are not intended to limit the present disclosure.

[0093] Before the specific embodiments of the present disclosure are described in detail, the following is first described the application scenarios of the present disclosure, the present disclosure can be applied to the scenarios of charging the power battery of different types of electric vehicles through charging piles, or discharging other electric vehicles through the power battery of electric vehicles. At present, most of the charging facilities are charging piles with fixed voltage output range, however, the charging parameters (such as charging voltage, charging current, power, etc.) of the power battery of different types of electric vehicles are different. When charging the power battery of different types of electric vehicles through the charging pile with fixed voltage output range, there may be problems of incompatibility of the voltage of the charging facility and the voltage of the power battery and low charging efficiency. When the charging voltage of the power battery of the electric vehicle is incompatible with the fixed output voltage of the charging pile, the charging pile cannot directly charge the power battery of the electric vehicle. At this time, a charging conversion device is usually needed to connect the charging pile and the electric vehicle, convert the output voltage of the charging pile into a charging voltage suitable for the electric vehicle, and ensure a safe and efficient charging process. However, the charging conversion device has the problems of large size and heavy weight, which is not convenient to carry; in the process of voltage conversion, the charging conversion device also generates a certain energy loss, so that part of the electric energy is converted into heat energy and lost, reducing the overall charging efficiency; and the cost of a high-performance charging conversion device may be relatively high. In addition, when facing some unexpected situations, such as the electric vehicle running out of power before reaching the fixed charging pile; or in remote areas, the distribution of charging stations is not dense enough, and the driver has difficulty in finding a charging station, the cost of using a rescue tow truck service is relatively high and needs to wait for rescue for a long time. In the face of these unexpected situations, the reliability and flexibility of vehicle charging are low, which makes the user experience poor.

[0094] To solve the above technical problems, the present disclosure provides a charging and discharging circuit and a vehicle, through the first charging and discharging interface, and according to the first charging and discharging request, the target motor electric control assembly, the battery module and the first target device form a charging path or a discharging path, which can form a charging path or a discharging path compatible with the battery module according to the first charging and discharging request of different first target devices, effectively avoid the problem of inability to charge caused by the incompatibility of the first target device and the battery module, and effectively improve the flexibility and reliability of vehicle charging and discharging, thereby improving the user experience and satisfaction.

[0095] Figure 1 is a circuit diagram of a charging and discharging circuit according to a first embodiment of the present disclosure. As shown in Figure 1, the charging and discharging circuit 100 includes a controller 101, a first charging and discharging interface 105 connected to the controller 101, a battery module 102, a target motor electronic control assembly 104, and a target switch 103, one end of the target switch 103 being connected to the battery module 102, the other end being connected to the target motor electronic control assembly 104, the target motor electronic control assembly 104 being further connected to the first charging and discharging interface 105, and the first charging and discharging interface 105 being used to connect a first target device 106.

[0096] The controller 101 is configured to control the target switch 103 to be closed and control the target motor electronic control assembly 104 to form a charging path or a discharging path with the battery module 102 and the first target device 106 according to a first charging and discharging request.

[0097] The first target device 106 can be a charging pile or other charging device with charging function, or a vehicle that needs to be charged. When the first target device 106 is a charging pile, the controller 101 sends the first charging and discharging request to the first target device 106, and the first charging and discharging request includes charging instructions and charging parameters. When the first target device 106 is a vehicle that needs to be charged, the first target device 106 sends the first charging and discharging request to the controller 101, and the first charging and discharging request includes discharging instructions and discharging parameters. The charging parameters can be one or more of charging voltage, charging current, and charging power, and the discharging parameters can be one or more of discharging voltage, discharging current, and discharging power. When receiving the charging instructions, the first charging and discharging request is determined according to the charging parameters of the battery module 102 and the output voltage, output current, and output power of the first target device 106. When receiving the discharging instructions, the first charging and discharging request is determined according to the discharging parameters of the battery module 102 and the input voltage, input current, and input power of the first target device 106.

[0098] For example, in the case of receiving a charging instruction, if it is determined that the output voltage of the first target device 106 is greater than or equal to the charging voltage of the battery module 102, it is determined that the first charging and discharging request is a step-down charging request; if it is determined that the output voltage of the first target device 106 is less than the charging voltage of the battery module 102, it is determined that the first charging and discharging request is a step-up charging request. In the case of receiving a discharging instruction, if it is determined that the input voltage of the first target device 106 is greater than or equal to the discharging voltage of the battery module 102, it is determined that the first charging and discharging request is a step-up discharging request; if it is determined that the input voltage of the first target device 106 is less than the discharging voltage of the battery module 102, it is determined that the first charging and discharging request is a step-down discharging request.

[0099] In the case of determining that the first charging and discharging request is a step-down charging request, the target switch 103 is closed, and the target motor control assembly 104 is controlled to form a step-down charging path with the battery module 102 and the first target device 106, so that the battery module 102 is step-down charged by the first target device 106.

[0100] In the case of determining that the first charging and discharging request is a step-up discharging request, the target switch 103 is closed, and the target motor control assembly 104 is controlled to form a step-up discharging path with the battery module 102 and the first target device 106, so that the first target device 106 is step-up discharged by the battery module 102.

[0101] The above technical solution controls the target motor control assembly to form a charging path or a discharging path with the battery module and the first target device according to the first charging and discharging request, which can form a charging path or a discharging path matched with the battery module according to different first charging and discharging requests of the first target device, effectively avoids the problem of inability to charge caused by the incompatibility between the first target device and the battery module, and effectively improves the flexibility and reliability of vehicle charging and discharging, thereby facilitating the improvement of user experience and satisfaction.

[0102] FIG. 2 is a circuit diagram of a charging and discharging circuit according to a second embodiment of the present disclosure. As shown in FIG. 2, the target motor control assembly 104 includes one or more target bridge arm conversion circuits, and each target bridge arm conversion circuit includes a target bridge arm M1 and a target winding M2.

[0103] For each target bridge arm conversion circuit, the first end of the target winding is connected to the midpoint of the target bridge arm, the second end of the target winding is connected to the battery module 102 through the target switch 103, and the convergence end of the target bridge arm is connected to the first charging and discharging interface 105.

[0104] The controller 101 is configured to determine at least one designated bridge-leg conversion circuit from the one or more target bridge-leg conversion circuits according to the first charge-discharge request, and the target switch 103 forms a charge path or a discharge path with the battery module 102 and the first target device 106 through the designated bridge-leg conversion circuit.

[0105] It should be noted that the controller 101 is configured to determine at least one designated bridge-leg conversion circuit from the one or more target bridge-leg conversion circuits according to the first charge-discharge request after the battery module 102 is powered on at a high voltage, and the target switch 103 forms a charge path or a discharge path with the battery module 102 and the first target device 106 through the designated bridge-leg conversion circuit. The target motor control assembly 104 can be a single-phase motor, a three-phase motor, or other types of motors. When the target motor control assembly 104 is a single-phase motor, the target motor control assembly 104 includes one target bridge-leg conversion circuit. When the target motor control assembly 104 is a three-phase motor, the target motor control assembly 104 includes three target bridge-leg conversion circuits. In the case of a single-phase motor, the target bridge-leg conversion circuit in the single-phase motor is directly used as the designated bridge-leg conversion circuit. In the case of a three-phase motor, one of the target bridge-leg conversion circuits can be used as the designated bridge-leg conversion circuit; two of the target bridge-leg conversion circuits can be used as the designated bridge-leg conversion circuit; or all of the three target bridge-leg conversion circuits can be used as the designated bridge-leg conversion circuit.

[0106] In addition, it should be noted that before the charging path or discharging path is formed by the target switch 103 and the battery module 102 and the first target device 106, it is necessary to determine that the battery module 102 is in high-voltage power-on. Alternatively, FIG. 3 is a circuit diagram of a charging and discharging circuit according to the embodiment shown in FIG. 2. As shown in FIG. 3, the battery module 102 includes a first battery switch K1, a second battery switch K2, a pre-charge switch K3, a pre-charge resistor R, and the charging and discharging circuit further includes a capacitor C1, a capacitor C2, a capacitor C3, and a first switch S1. The capacitor C1, the capacitor C2, and the capacitor C3 are used for voltage stabilization and filtering and are charged during high-voltage power-on. The pre-charge resistor R is used to limit the current at the initial stage of charging to prevent a large current impact that may cause damage to sensitive electronic components (such as a target bridge arm conversion circuit) in the charging and discharging circuit. High-voltage power-on of the battery module 102 refers to that before the vehicle is ready to charge, a pre-charge signal is sent to the battery module 102 by a low-voltage control system of the vehicle, and the pre-charge signal is used to indicate that the battery module 102 enters a start state. After receiving the pre-charge signal, the second battery switch K2 and the pre-charge switch K3 are controlled to be closed, and the capacitor C1, the capacitor C2, and the capacitor C3 are charged by the battery module 102. When the voltages of the capacitor C1, the capacitor C2, and the capacitor C3 are equal to a preset voltage threshold of the battery module 102, it is determined that the pre-charge process is completed. At this time, the pre-charge switch K3 is opened, the first battery switch K1 and the second battery switch K2 are closed, the high-voltage system is completely connected, and the battery module 102 completes high-voltage power-on. Alternatively, FIG. 4 is a circuit diagram of a charging and discharging circuit according to the embodiment shown in FIG. 3. As shown in FIG. 4, after it is determined that the battery module 102 is in high-voltage power-on, if it is determined that the output voltage of the first target device 106 matches the charging voltage of the battery module 102, the first battery switch K1 and the second battery switch K2 are controlled to be closed, and the pre-charge switch K3 is opened. The first target device 106 directly charges the battery module 102 through the first charging and discharging interface 105, the first battery switch K1, and the second battery switch K2.

[0107] Optionally, still taking FIG. 2 as an example, during the first specified time period of each first control period, the controller 101 is configured to, in the case that the first charge-discharge request is a first step-down charging request, control the target switch 103 to be closed during the first specified time period of each first control period, and the upper bridge arm of the target bridge arm M1 in the specified bridge arm conversion circuit to be turned on, so as to form a first step-down charging path between the first target device 106, the upper bridge arm of the target bridge arm M1 in the specified bridge arm conversion circuit, the target winding M2 in the specified bridge arm conversion circuit, the target switch 103 and the battery module 102, so that the first target device 106 charges the target winding M2 in the specified bridge arm conversion circuit and the battery module 102.

[0108] In the case that the first target device 106 is a charging pile or other charging device with charging function, in the case that a first charging instruction is received, if it is determined that the output voltage of the first target device 106 is greater than the charging voltage of the battery module 102, it is determined that the first charge-discharge request is a first step-down charging request. At this time, the target switch 103 is closed, and the upper bridge arm of the target bridge arm M1 in the specified bridge arm conversion circuit is turned on. The current output by the positive electrode of the first target device 106 passes through the first charge-discharge interface 105, the upper bridge arm of the target bridge arm M1 in the specified bridge arm conversion circuit, the target winding M2 in the specified bridge arm conversion circuit, the target switch 103, the positive electrode of the battery module 102, the negative electrode of the battery module 102, and returns to the negative electrode of the first target device 106 in sequence.

[0109] It should be noted that when one or less than the number of the target bridge arm change circuits is determined from the one or more target bridge arm change circuits, in each first control period, the specified bridge arm change circuit is selected and determined from the one or more target bridge arm change circuits in a cycle. For example, when the target motor control assembly 104 is a three-phase motor, the three-phase motor includes three target bridge arm change circuits U, W, and V. When one specified bridge arm change circuit is determined from the one or more target bridge arm change circuits, in the first cycle of the first specified time period, U can be selected as the specified bridge arm change circuit, in the second cycle of the first specified time period, W can be selected as the specified bridge arm change circuit, in the third cycle of the first specified time period, V can be selected as the specified bridge arm change circuit, and in the fourth cycle of the first specified time period, U can be selected as the specified bridge arm change circuit, and the specified bridge arm change circuit is determined in turn. When less than the number of the target bridge arm change circuits is determined from the one or more target bridge arm change circuits, in the first cycle of the first specified time period, U and W can be selected as the specified bridge arm change circuit, in the second cycle of the first specified time period, W and V can be selected as the specified bridge arm change circuit, in the third cycle of the first specified time period, V and U can be selected as the specified bridge arm change circuit, and in the fourth cycle of the first specified time period, U and W can be selected as the specified bridge arm change circuit, and the specified bridge arm change circuit is determined in turn. By alternately determining the specified bridge arm change circuit from the one or more target bridge arm change circuits, the single target bridge arm overheating can be avoided, the overall heat dissipation efficiency can be improved, and the service life of the target bridge arm change circuit can be prolonged. In the figure, the target motor control assembly 104 is taken as an example of a three-phase motor, and the specified bridge arm change circuit is taken as an example of three target bridge arm change circuits.

[0110] Optionally, FIG. 5 is a circuit diagram of a charging and discharging circuit according to a third embodiment of the present disclosure. As shown in FIG. 5, in the second specified time period of each first control period, the controller 101 is further configured to control the target switch 103 to be closed, the upper bridge arm of the target bridge arm M1 in the specified bridge arm change circuit to be cut off, and the lower bridge arm of the target bridge arm M1 in the specified bridge arm change circuit to be turned on in the second specified time period of each first control period, so as to form the target winding M2 in the specified bridge arm change circuit, the second voltage reduction charging path between the target switch 103, the battery module 102, and the lower bridge arm of the target bridge arm M1 in the specified bridge arm change circuit, and charge the battery module 102 by the target winding M2 in the specified bridge arm change circuit.

[0111] The first target device 106 can be a charging pile or other charging device with charging function. When the first charging instruction is received, if it is determined that the output voltage of the first target device is greater than the charging voltage of the battery module 102, it is determined that the first charge-discharge request is a first step-down charging request. At this time, the target switch 103 is closed, the upper bridge arm of the target bridge arm M1 in the specified bridge arm conversion circuit is cut off, and the lower bridge arm of the target bridge arm M1 in the specified bridge arm conversion circuit is turned on. In the second specified time period of each first control period, the target winding M2 in the specified bridge arm conversion circuit charges the battery module 102, and the current output from the positive electrode of the target winding M2 in the specified bridge arm conversion circuit passes through the target switch 103, the positive electrode of the battery module 102, the negative electrode of the battery module 102, the lower bridge arm of the target bridge arm M1 in the specified bridge arm conversion circuit, and returns to the negative electrode of the target winding in the specified bridge arm conversion circuit.

[0112] It should be noted that in the first specified time period of each first control period, the first target device 106 charges the battery module 102 and the target winding M2 in the specified bridge arm conversion circuit through the first step-down charging path. The target winding M2 in the specified bridge arm conversion circuit can divide the output voltage of the first target device 106, so that the first target device 106 can realize step-down charging of the battery module 102. In the second specified time period of each first control period, the target winding M2 in the specified bridge arm conversion circuit charges the battery module 102 through the second step-down charging path. The output voltage of the target winding M2 in the specified bridge arm conversion circuit is derived from the voltage division of the specified bridge arm conversion circuit by the first target device 106 in the first specified time period of each first control period, so that step-down charging of the battery module 102 can be realized.

[0113] The above technical solution forms a first step-down charging path and a second step-down charging path through the first target device, the specified bridge arm conversion circuit and the battery module. When the output voltage of the first target device is greater than the charging voltage of the battery module, the first target device can charge the battery module and the target winding of the specified bridge arm conversion circuit through the first step-down charging path, and the target winding of the specified bridge arm conversion circuit can charge the battery module through the second step-down charging path. Moreover, no additional charging conversion device is needed, which can effectively improve the convenience of vehicle charging, thereby improving the user experience and satisfaction.

[0114] Figure 6 is a circuit diagram of a charging and discharging circuit according to a fourth embodiment of the present disclosure. As shown in Figure 6, the controller 101 is configured to, in the case that the first charging and discharging request is a first step-up discharging request, control the target switch 103 to be closed in a first specified time period of each second control period, and the lower bridge arm of the target bridge arm M1 in the specified bridge arm conversion circuit to be turned on, so as to form a first path between the battery module 102, the target switch 103, the target winding M2 in the specified bridge arm conversion circuit, and the lower bridge arm of the target bridge arm M1 in the specified bridge arm conversion circuit, so that the battery module 102 discharges the target winding M2 in the specified bridge arm conversion circuit.

[0115] The first target device 106 can be a powered vehicle or other device that needs to be charged. In the case that the first discharging instruction is received, if it is determined that the charging voltage of the first target device 106 is greater than the output voltage of the battery module 102, it is determined that the first charging and discharging request is a first step-up discharging request. At this time, the target switch 103 is closed, and the lower bridge arm of the target bridge arm M1 in the specified bridge arm conversion circuit is turned on. The current output from the positive electrode of the battery module 102 passes through the target switch 103, the target winding M2 in the specified bridge arm conversion circuit, and the lower bridge arm of the target bridge arm M1 in the specified bridge arm conversion circuit in turn, and returns to the negative electrode of the battery module 102.

[0116] Optionally, Figure 7 is a circuit diagram of a charging and discharging circuit according to a fifth embodiment of the present disclosure. As shown in Figure 7, in the second specified time period of each second control period, the controller 101 is further configured to control the target switch 103 to be closed, the upper bridge arm of the target bridge arm M1 in the specified bridge arm conversion circuit to be turned on, and the lower bridge arm of the target bridge arm M1 in the specified bridge arm conversion circuit to be turned off, so as to form a first step-up discharging path between the battery module 102, the target switch 103, the target winding M2 in the specified bridge arm conversion circuit, the upper bridge arm of the target bridge arm M1 in the specified bridge arm conversion circuit, and the first target device 106, so that the battery module 102 and the target winding M2 in the specified bridge arm conversion circuit discharge the first target device 106.

[0117] The first target device 106 can be a powered vehicle or other device that needs to be charged. When the first discharge instruction of the first target device 106 is received, if it is determined that the charging voltage of the first target device 106 is greater than the output voltage of the battery module 102, it is determined that the first charge-discharge request is a first step-up discharge request. At this time, the target switch 103 is closed, the upper bridge arm of the target bridge arm M1 in the specified bridge arm conversion circuit is turned on, and the lower bridge arm of the target bridge arm M1 in the specified bridge arm conversion circuit is turned off. In each second control period, the target winding M2 in the specified bridge arm conversion circuit and the battery module 102 discharge the first target device 106 in the second specified time period. The current output from the positive electrode of the battery module 102 passes through the target switch 103, the target winding M2 in the specified bridge arm conversion circuit, the upper bridge arm of the target bridge arm M1 in the specified bridge arm conversion circuit, the first charge-discharge interface 105, the first target device 106, and returns to the negative electrode of the battery module 102.

[0118] The above technical solution can discharge the target winding in the specified bridge arm conversion circuit through the first path in the first specified time period of each second control period, and can discharge the first target device through the first step-up discharge path by the battery module and the target winding in the specified bridge arm conversion circuit in the second specified time period of each second control period. In the case where the charging voltage of the first target device is greater than the output voltage of the battery module, the first target device can be discharged by step-up, which effectively improves the flexibility of vehicle charging and discharging, thereby improving the user experience and satisfaction.

[0119] FIG. 8 is a circuit diagram of a charging and discharging circuit according to a sixth embodiment of the present disclosure. As shown in FIG. 8, the charging and discharging circuit further includes a first switch S1,

[0120] The first end of the first switch S1 is connected to the second end of the target winding in the specified bridge arm conversion circuit, and the second end of the first switch S1 is connected to the first charge-discharge interface 105.

[0121] Optionally, as shown in FIG. 8, during the first specified time period of each third control cycle, the controller 101 is configured to, in the case that the first charge-discharge request is a first step-up charging request, control the first switch S1 to be closed, the target switch 103 to be opened, and the lower bridge arm of the target bridge arm M1 in the specified bridge arm conversion circuit to be conducted during the first specified time period of each third control cycle, so as to form a second path between the first target device 106, the first switch S1, the target winding M2 in the specified bridge arm conversion circuit, and the lower bridge arm of the target bridge arm M1 in the specified bridge arm conversion circuit, so that the first target device 106 charges the target winding M2 in the specified bridge arm conversion circuit.

[0122] The first target device 106 can be a charging pile or other charging device with charging function. In the case that a second charging instruction is received, if it is determined that the output voltage of the first target device 106 is less than the charging voltage of the battery module 102, it is determined that the first charge-discharge request is a step-up charging request. At this time, the first switch S1 is closed, the target switch 103 is opened, and the lower bridge arm of the target bridge arm M1 in the specified bridge arm conversion circuit is conducted. The current output from the positive electrode of the first target device 106 passes through the first switch S1, the target winding M2 in the specified bridge arm conversion circuit, and the lower bridge arm of the target bridge arm M1 in the specified bridge arm conversion circuit in turn, and returns to the negative electrode of the first target device 106.

[0123] Optionally, as shown in FIG. 9, during the second specified time period of each third control cycle, the controller 101 is further configured to, in the case that the first charge-discharge request is a first step-up charging request, control the first switch S1 to be closed, the target switch 103 to be opened, the upper bridge arm of the target bridge arm M1 in the specified bridge arm conversion circuit to be conducted, and the lower bridge arm of the target bridge arm M1 in the specified bridge arm conversion circuit to be cut off during the second specified time period of each third control cycle, so as to form a first step-up charging path between the first target device 106, the first switch S1, the target winding M2 in the specified bridge arm conversion circuit, the upper bridge arm of the target bridge arm M1 in the specified bridge arm conversion circuit, and the battery module 102, so that the first target device 106 and the target winding M2 in the specified bridge arm conversion circuit charge the battery module 102.

[0124] The first target device 106 can be a charging pile or other charging device with charging function. In the case of receiving the second charging instruction, if it is determined that the output voltage of the first target device 106 is less than the charging voltage of the battery module 102, it is determined that the first charging and discharging request is a first step-up charging request. At this time, the first switch S1 is closed, the target switch 103 is opened, the upper bridge arm of the target bridge arm M1 in the specified bridge arm conversion circuit is turned on, and the lower bridge arm of the target bridge arm M1 in the specified bridge arm conversion circuit is turned off. In the second specified time period of each third control period, the target winding M2 in the specified bridge arm conversion circuit and the first target device 106 charge the battery module 102. The current output from the positive electrode of the first target device 106 passes through the first switch S1, the target winding M2 in the specified bridge arm conversion circuit, the upper bridge arm of the target bridge arm M1 in the specified bridge arm conversion circuit, the battery module 102, the first charging and discharging interface 105, and returns to the negative electrode of the first target device 106.

[0125] The above technical solution can charge the target winding in the specified bridge arm conversion circuit through the second path in the first specified time period of each third control period, and can charge the battery module through the first step-up charging path by the first target device and the target winding in the specified bridge arm conversion circuit in the second specified time period of each third control period. In the case that the output voltage of the first target device is less than the charging voltage of the battery module, the battery module can be charged by step-up charging, without the need for additional charging conversion devices, which can effectively improve the convenience of vehicle charging, thereby improving the experience and satisfaction of users.

[0126] FIG. 10 is a circuit diagram of a charging and discharging circuit according to an eighth embodiment of the present disclosure. As shown in FIG. 10, the controller 101 is configured to, in the case that the first charging and discharging request is a second step-down charging request, control the target switch 103 to be closed, the first switch S1 to be opened, and the upper bridge arm of the target bridge arm M1 in the specified bridge arm conversion circuit to be turned on in the first specified time period of each fourth control period, so as to form a third step-down charging path between the first target device 106, the upper bridge arm of the target bridge arm M1 in the specified bridge arm conversion circuit, the target winding M2 in the specified bridge arm conversion circuit, the target switch 103, and the battery module 102, so that the first target device 106 charges the target winding M2 in the specified bridge arm conversion circuit and the battery module 102.

[0127] The first target device 106 can be a charging pile or other charging device with charging function. In the case of receiving a third charging instruction, if it is determined that the output voltage of the first target device 106 is greater than the charging voltage of the battery module 102, it is determined that the first charging and discharging request is a step-down charging request. At this time, the target switch 103 is closed, the first switch S1 is opened, and the upper bridge arm of the target bridge arm M1 in the specified bridge arm conversion circuit is turned on. The current output from the positive electrode of the first target device 106 passes through the upper bridge arm of the target bridge arm M1 in the specified bridge arm conversion circuit, the target winding M2 in the specified bridge arm conversion circuit, the target switch 103, the battery module 102, the first charging and discharging interface 105, and returns to the negative electrode of the first target device 106 in turn.

[0128] Alternatively, FIG. 11 is a circuit diagram of a charging and discharging circuit according to a ninth embodiment of the present disclosure. As shown in FIG. 11, in the second specified time period of each fourth control period, the controller 101 is further configured to control the target switch 103 to be closed, the first switch S1 to be opened, the upper bridge arm of the target bridge arm M1 in the specified bridge arm conversion circuit to be turned off, and the lower bridge arm of the target bridge arm M1 in the specified bridge arm conversion circuit to be turned on, so as to form a fourth step-down charging path between the target winding M2 in the specified bridge arm conversion circuit, the target switch 103, the battery module 102, and the lower bridge arm of the target bridge arm M1 in the specified bridge arm conversion circuit, so that the target winding M2 in the specified bridge arm conversion circuit charges the battery module 102.

[0129] The first target device 106 can be a charging pile or other charging device with charging function. In the case of receiving a third charging instruction, if it is determined that the output voltage of the first target device 106 is greater than the charging voltage of the battery module 102, it is determined that the first charging and discharging request is a second step-down charging request. At this time, the target switch 103 is closed, the first switch S1 is opened, the upper bridge arm of the target bridge arm M1 in the specified bridge arm conversion circuit is turned off, and the lower bridge arm of the target bridge arm M1 in the specified bridge arm conversion circuit is turned on. In the second specified time period of each fourth control period, the target winding M2 in the specified bridge arm conversion circuit charges the battery module 102. The current output from the positive electrode of the target winding M2 in the specified bridge arm conversion circuit passes through the target switch 103, the battery module 102, and the lower bridge arm of the target bridge arm M1 in the specified bridge arm conversion circuit in turn, and returns to the negative electrode of the target winding M2 in the specified bridge arm conversion circuit.

[0130] The above technical scheme, in the first specified time period of each fourth control period, the first target device charges the target winding in the specified bridge arm conversion circuit and the battery module through the third step-down charging path; in the second specified time period of each fourth control period, the target winding in the specified bridge arm conversion circuit charges the battery module through the fourth step-down charging path. The battery module can be charged in the case that the output voltage of the first target device is greater than the charging voltage of the battery module, without the need for an additional charging conversion device, which can effectively improve the convenience of vehicle charging, thereby facilitating the improvement of user experience and satisfaction.

[0131] Optionally, still taking FIG. 11 as an example, in the first specified time period of each fifth control period, the controller 101 is configured to, in the case that the first charge-discharge request is a second step-up discharge request, control the target switch 103 to be closed, the first switch S1 to be disconnected, and the lower bridge arm of the target bridge arm M1 in the specified bridge arm conversion circuit to be conducted in the first specified time period of each fifth control period, so as to form a third path between the battery module 102, the target switch 103, the target winding M2 in the specified bridge arm conversion circuit, and the lower bridge arm of the target bridge arm M1 in the specified bridge arm conversion circuit, so that the battery module 102 discharges the target winding M2 in the specified bridge arm conversion circuit.

[0132] In the case that the second discharge instruction is received, if it is determined that the charging voltage of the first target device 106 is greater than the output voltage of the battery module 102, it is determined that the first charge-discharge request is a second step-up discharge request. At this time, the target switch 103 is closed, the first switch S1 is disconnected, and the lower bridge arm of the target bridge arm M1 in the specified bridge arm conversion circuit is conducted. The current output by the positive electrode of the battery module 102 passes through the target switch 103, the target winding M2 in the specified bridge arm conversion circuit, and the lower bridge arm in the specified bridge arm conversion circuit in sequence, and returns to the negative electrode of the battery module 102.

[0133] Optionally, as shown in FIG. 10, during the second specified time period of each fifth control cycle, the controller 101 is further configured to control the target switch 103 to be closed, the first switch S1 to be opened, the upper bridge arm of the target bridge arm M1 in the specified bridge arm conversion circuit to be turned on, and the lower bridge arm of the target bridge arm M1 in the specified bridge arm conversion circuit to be turned off, so as to form a second step-up discharge path between the battery module 102, the target switch 103, the target winding M2 in the specified bridge arm conversion circuit, the upper bridge arm of the target bridge arm M1 in the specified bridge arm conversion circuit, and the first target device 106, so as to discharge the battery module 102 and the target winding M2 in the specified bridge arm conversion circuit to the first target device 106.

[0134] The first target device 106 can be a powered vehicle or other device that needs to be charged. When the second discharge instruction of the first target device 106 is received, if it is determined that the charging voltage of the first target device 106 is greater than the output voltage of the battery module 102, it is determined that the first charge-discharge request is a second step-up discharge request. At this time, the target switch 103 is closed, the first switch S1 is opened, the upper bridge arm of the target bridge arm M1 in the specified bridge arm conversion circuit is turned on, and the lower bridge arm of the target bridge arm M1 in the specified bridge arm conversion circuit is turned off. During the second specified time period of each fifth control cycle, the target winding M2 in the specified bridge arm conversion circuit and the battery module 102 discharge the first target device 106. The current output from the positive electrode of the battery module 102 passes through the target switch 103, the target winding M2 in the specified bridge arm conversion circuit, the upper bridge arm of the target bridge arm M1 in the specified bridge arm conversion circuit, the first target device 106, and returns to the negative electrode of the battery module 102.

[0135] It should be noted that the process of boosting discharging in the fifth control cycle is similar to the process of step-down charging in the fourth cycle. The process of step-down charging in the fourth cycle is to control the first target device 106 to charge the target winding M2 in the specified bridge arm conversion circuit and the battery module 102 through the current path of the first specified time period of the fourth cycle, and then control the target winding M2 in the specified bridge arm conversion circuit to charge the battery module 102 through the current path of the second specified time period of the fourth cycle. The process of boosting discharging in the fifth control cycle is opposite to the process of step-down charging in the fourth cycle in current flow direction and cycle sequence. First, control the first target device 106 to discharge the target winding M2 in the specified bridge arm conversion circuit through the current path of the second specified time period of the fourth cycle, and then control the target winding M2 in the specified bridge arm conversion circuit and the battery module 102 to discharge the first target device 106 through the current path of the first specified time period of the fourth cycle.

[0136] In addition, it should be noted that the first charging and discharging request includes a plurality of first charging and discharging modes, each first charging and discharging mode corresponds to a control cycle. When the first charging and discharging request is received, the first target charging and discharging mode corresponding to the first charging and discharging request is determined, the first target control cycle is determined, and the first charging path or the first discharging path is formed by the first target device, the specified bridge arm conversion circuit, and the battery module according to the instructions in the first target control cycle. The second charging and discharging request includes a plurality of second charging and discharging modes, each second charging and discharging request corresponds to a control cycle. When the second charging and discharging request is received, the second target charging and discharging mode corresponding to the second charging and discharging request is determined, the second target control cycle is determined, and the second charging path or the second discharging path is formed by the second target device, the first target bridge arm conversion circuit, and the battery module according to the instructions in the second target control cycle. When the first charging and discharging request and the second charging and discharging request are received at the same time, the first charging path and / or the second charging path, or the first charging path and / or the second discharging path, or the first discharging path and / or the second charging path, or the first discharging path and / or the second discharging path can be formed according to the first charging and discharging request and the second charging and discharging request.

[0137] For example, the first charging and discharging request comprises a first step-down charging mode and a first step-up discharging mode, the first step-down charging mode corresponds to a first control period, and the first step-up discharging mode corresponds to a second control period; the second charging and discharging request comprises a second step-down charging mode and a second step-up discharging mode, the second step-down charging mode corresponds to a third control period, and the second step-up discharging mode corresponds to a fourth control period. In the case of receiving the first charging and discharging request, if it is determined that the first charging and discharging request corresponds to the first step-down charging mode, it can be determined that the first charging and discharging request corresponds to a first target control period, and the battery module is charged in a step-down manner according to the instructions in the first target control period through the first target device. In the case of receiving the second charging and discharging request, if it is determined that the second charging and discharging request corresponds to the second step-up discharging mode, it can be determined that the second charging and discharging request corresponds to a fourth target control period, and the second target device is discharged in a step-up manner according to the instructions in the fourth target control period through the battery module. It should be noted that one first charging and discharging request and / or one second charging and discharging request can be received at the same time, but multiple first charging and discharging requests or second charging and discharging requests cannot be received at the same time.

[0138] The above technical solution can discharge the target winding in the specified bridge arm conversion circuit through the third path in the first specified time period of each fifth control period, and can discharge the battery module in a step-up manner through the second step-up discharging path in the second specified time period of each fifth control period. In the case that the charging voltage of the first target device is greater than the output voltage of the battery module, the first target device can be discharged in a step-up manner, which effectively improves the flexibility of vehicle charging and discharging, thereby facilitating the improvement of user experience and satisfaction.

[0139] Optionally, in the first specified time period of each sixth control period, as shown in FIG. 9, the controller 101 is configured to, in the case that the first charging and discharging request is a first step-down discharging request, control the first switch S1 to be closed, the target switch 103 to be opened, and the upper bridge arm of the target bridge arm M1 in the specified bridge arm conversion circuit to be conducted in the first specified time period of each sixth control period, so as to form a first step-down discharging path between the battery module 102, the upper bridge arm of the target bridge arm M1 in the specified bridge arm conversion circuit, the target winding M2 in the specified bridge arm conversion circuit, the first switch S1, and the first target device 106, so that the battery module 102 discharges the target winding M2 in the specified bridge arm conversion circuit and the first target device 106.

[0140] The first target device 106 can be a powered vehicle or other device that needs to be charged. In the case of receiving a third discharge instruction, if it is determined that the charging voltage of the first target device 106 is less than the output voltage of the battery module 102, it is determined that the first charge and discharge request is a first step-down discharge request. At this time, the first switch S1 is closed, the target switch 103 is opened, and the upper bridge arm of the target bridge arm M1 in the specified bridge arm conversion circuit is turned on. The current output from the positive terminal of the battery module 102 passes through the upper bridge arm of the target bridge arm M1 in the specified bridge arm conversion circuit, the target winding M2 in the specified bridge arm conversion circuit, the first switch S1, the first target device 106, and returns to the negative terminal of the battery module 102 in sequence.

[0141] Alternatively, in the second specified time period of each sixth control period, as shown in FIG. 8, the controller 101 is further configured to control the first switch S1 to be closed, the target switch 103 to be opened, the upper bridge arm of the target bridge arm M1 in the specified bridge arm conversion circuit to be turned off, and the lower bridge arm of the target bridge arm M1 in the specified bridge arm conversion circuit to be turned on in the second specified time period of each sixth control period, so as to form a second step-down discharge path between the target winding M2 in the specified bridge arm conversion circuit, the first switch S1, the first target device 106, and the lower bridge arm of the target bridge arm M1 in the specified bridge arm conversion circuit, so that the target winding M2 in the specified bridge arm conversion circuit charges the first target device 106.

[0142] In the case of receiving a third discharge instruction, if it is determined that the charging voltage of the first target device 106 is less than the output voltage of the battery module 102, it is determined that the first charge and discharge request is a first step-down discharge request. At this time, the first switch S1 is closed, the target switch 103 is opened, and the upper bridge arm of the target bridge arm M1 in the specified bridge arm conversion circuit is turned off, and the lower bridge arm of the target bridge arm M1 in the specified bridge arm conversion circuit is turned on. In the second specified time period of each sixth control period, the target winding M2 in the specified bridge arm conversion circuit discharges the first target device 106. The current output from the positive terminal of the target winding M2 in the specified bridge arm conversion circuit passes through the first switch S1, the first target device 106, the lower bridge arm of the target bridge arm M1 in the specified bridge arm conversion circuit, and returns to the negative terminal of the target winding M2 in the specified bridge arm conversion circuit in sequence.

[0143] It should be noted that the process of discharging the voltage of the sixth control cycle is similar to the process of charging the voltage of the third cycle. The process of charging the voltage of the third cycle first passes through the current path of the first specified time period of the third cycle, controls the first target device 106 to charge the target winding M2 in the specified bridge arm conversion circuit, and then passes through the current path of the second specified time period of the third cycle, and controls the target winding M2 in the specified bridge arm conversion circuit and the first target device 106 to charge the battery module 102. The process of discharging the voltage of the sixth control cycle is opposite to the process of charging the voltage of the third cycle, and the cycle sequence is opposite. First, pass through the current path of the second specified time period of the third cycle, control the first target device 106 to discharge the target winding M2 in the specified bridge arm conversion circuit and the battery module 102, and then pass through the current path of the second specified time period of the third cycle, control the target winding M2 in the specified bridge arm conversion circuit to discharge the first target device 106.

[0144] The above technical scheme can discharge the voltage of the target winding in the specified bridge arm conversion circuit and the first target device through the first discharging path in the first specified time period of each sixth control cycle, and discharge the voltage of the target winding in the specified bridge arm conversion circuit through the second discharging path in the second specified time period of each sixth control cycle. The first target device can be discharged at a voltage less than the output voltage of the battery module, effectively improving the flexibility of vehicle charging and discharging, thereby improving the user experience and satisfaction.

[0145] FIG. 12 is a circuit diagram of a charging and discharging circuit according to a tenth embodiment of the present disclosure. As shown in FIG. 12, the charging and discharging circuit further comprises a first motor control assembly 107 and a second charging and discharging interface 109. One end of the first motor control assembly 107 is connected to the second charging and discharging interface 109, and the other end is connected to the battery module 102. The second charging and discharging interface 109 is used to connect a second target device 1010.

[0146] The controller 101 is configured to control the first motor control assembly 107 to form a charging path or a discharging path with the battery module 102 and the second target device 1010 according to a second charging and discharging request.

[0147] The first motor electric control assembly 107 can be a single-phase motor, a three-phase motor, or other types of motor. The second target device 1010 can be a charging pile or other charging device with charging function. When the second target device 1010 is a charging pile, the second charge-discharge request including charging instructions and charging parameters is sent by the controller 101 to the second target device 1010; when the second target device 1010 is a vehicle that needs to be charged, the second charge-discharge request including discharge instructions and discharge parameters is sent by the second target device 1010 to the controller 101. The charging parameter can be one or more of charging voltage, charging current and charging power, and the discharge parameter can be one or more of discharge voltage, discharge current and discharge power. When receiving the charging instruction, the second charge-discharge request is determined according to the charging parameter of the battery module 102 and the output voltage, output current and output power of the second target device 1010. When receiving the discharge instruction, the second charge-discharge request is determined according to the discharge parameter of the battery module 102 and the input voltage, input current and input power of the second target device 1010.

[0148] For example, when receiving the charging instruction, if it is determined that the output voltage of the second target device 1010 is greater than or equal to the charging voltage of the battery module 102, it is determined that the second charge-discharge request is a step-down charging request; if it is determined that the output voltage of the second target device 1010 is less than the charging voltage of the battery module 102, it is determined that the second charge-discharge request is a step-up charging request. When receiving the discharge instruction, if it is determined that the input voltage of the target device is greater than or equal to the discharge voltage of the battery module 102, it is determined that the second charge-discharge request is a step-up discharge request; if it is determined that the input voltage of the first target device 106 is less than the discharge voltage of the battery module 102, it is determined that the second charge-discharge request is a step-down discharge request.

[0149] Optionally, still taking FIG. 12 as an example, the charge-discharge circuit further includes a second switch S2 and a third switch S3,

[0150] The first motor electric control assembly 107 includes one or more first bridge arm conversion circuits, and each first bridge arm conversion circuit includes a first bridge arm and a first winding;

[0151] For each first bridge arm conversion circuit, a first end of the first winding is connected with a midpoint of the first bridge arm, a second end of the first winding is connected with the second charge-discharge interface 109, a common end of the first bridge arm is connected with a positive electrode of the battery module 102 through the second switch S2, and the common end of the first bridge arm is also connected with a negative electrode of the battery module 102 through the third switch S3.

[0152] The controller 101 is configured to determine at least one first target bridge arm conversion circuit from the one or more first bridge arm conversion circuits according to the second charge-discharge request, and form a charge path or a discharge path between the battery module 102 and the second target device 1010 through the first target bridge arm conversion circuit.

[0153] It should be noted that the first motor control assembly 107 can be a single-phase motor, a three-phase motor, or other types of motors. When the first motor control assembly 107 is a single-phase motor, the first motor control assembly 107 includes one first bridge arm conversion circuit. When the first motor control assembly 107 is a three-phase motor, the first motor control assembly 107 includes three first bridge arm conversion circuits. In the case of a single-phase motor, the first bridge arm conversion circuit in the single-phase motor is directly used as the first target bridge arm conversion circuit. In the case of a three-phase motor, one of the first bridge arm conversion circuits can be used as the first target bridge arm conversion circuit, two of the first bridge arm conversion circuits can be used as the first target bridge arm conversion circuit, or all of the three first bridge arm conversion circuits can be used as the first target bridge arm conversion circuit.

[0154] Optionally, in the first specified time period of each seventh control period, still taking FIG. 12 as an example, the controller 101 is configured to, in the case that the second charge-discharge request is a second boost charging request, control the target switch 103, the second switch S2 and the third switch S3 to be turned off, and the lower bridge arm of the first bridge arm A1 in the first target bridge arm conversion circuit to be turned on in the first specified time period of each seventh control period, so as to form a fourth path between the second target device 1010 and the first winding A2 in the first target bridge arm conversion circuit and the lower bridge arm of the first bridge arm A1 in the first target bridge arm conversion circuit, so that the second target device 1010 charges the first winding A2 in the first target bridge arm conversion circuit.

[0155] The second target device 1010 can be a charging pile or other charging device with charging function. In the case of receiving the fourth charging instruction, if it is determined that the output voltage of the second target device 1010 is less than the charging voltage of the battery module 102, it is determined that the second charging and discharging request is a step-up charging request. At this time, the target switch 103, the second switch S2 and the third switch S3 are opened, and the lower bridge arm of the first bridge arm A1 in the first target bridge arm conversion circuit is turned on. The current output from the positive electrode of the second target device 1010 passes through the first winding A2 in the first target bridge arm conversion circuit and the lower bridge arm of the first bridge arm A1 in the first target bridge arm conversion circuit in turn, and returns to the negative electrode of the second target device 1010.

[0156] Alternatively, FIG. 13 is a circuit diagram of a charging and discharging circuit according to an eleventh embodiment of the present disclosure. As shown in FIG. 13, in the second specified time period of each seventh control period, the controller 101 is further configured to control the target switch 103 to be opened, the second switch S2 and the third switch S3 to be closed, and the upper bridge arm of the first bridge arm A1 in the first target bridge arm conversion circuit to be turned on and the lower bridge arm of the first bridge arm A1 in the first target bridge arm conversion circuit to be turned off in the second specified time period of each seventh control period, so as to form a second step-up charging path between the second target device 1010, the first winding A2 in the first target bridge arm conversion circuit, the upper bridge arm of the first bridge arm A1 in the first target bridge arm conversion circuit, the second switch S2, the battery module 102 and the third switch S3, so that the second target device 1010 and the first winding A2 in the first target bridge arm conversion circuit charge the battery module 102.

[0157] The seventh control period can include only the first specified time period, or can include the first specified time period and the second specified time period. When the current power of the battery module 102 in the second specified time period is greater than or equal to the power threshold of the battery module 102, the seventh control period can include only the first specified time period. The second target device 1010 can be a charging pile or other charging device with charging function. When the fourth charging instruction of the second target device 1010 is received, if it is determined that the output voltage of the second target device 1010 is less than the charging voltage of the battery module 102, it is determined that the second charging and discharging request is a step-up charging request. At this time, the target switch 103 is open, the second switch S2 and the third switch S3 are closed, the upper bridge arm of the first bridge arm A1 in the first target bridge arm conversion circuit is turned on, and the lower bridge arm of the first bridge arm A1 in the first target bridge arm conversion circuit is turned off. In the second specified time period of each seventh control period, the first winding A2 in the first target bridge arm conversion circuit and the second target device 1010 charge the battery module 102. The current output from the positive electrode of the second target device 1010 passes through the first winding A2 in the first target bridge arm conversion circuit, the upper bridge arm of the first bridge arm A1 in the first target bridge arm conversion circuit, the second switch S2, the battery module 102, and the third switch S3 in turn, and returns to the negative electrode of the second target device 1010.

[0158] The above technical solution, in the first specified time period of each seventh control period, the second target device charges the first winding in the first target bridge arm conversion circuit through the fourth path; in the second specified time period of each seventh control period, the second target device and the first winding in the first target bridge arm conversion circuit charge the battery module through the second step-up charging path. In the case where the output voltage of the second target device is less than the charging voltage of the battery module, the battery module can be charged by step-up, without the need for additional charging conversion devices, which can effectively improve the convenience of vehicle charging, thereby facilitating the improvement of user experience and satisfaction.

[0159] Fig. 14 is a circuit diagram of a charging and discharging circuit according to a twelfth embodiment of the present disclosure. As shown in Fig. 14, the controller 101 is configured to, in the case that the second charging and discharging request is a second step-down discharging request, control the target switch 103 to be open, the second switch S2 and the third switch S3 to be closed, and the upper bridge arm of the first bridge arm A1 in the first target bridge arm conversion circuit to be conductive in a first specified time period of each eighth control period, so as to form a third step-down discharging path between the battery module 102, the second switch S2, the upper bridge arm of the first bridge arm A1 in the first target bridge arm conversion circuit, the first winding A2 in the first target bridge arm conversion circuit, the second target device 1010, and the third switch S3, so as to cause the battery module 102 to discharge the first winding A2 in the first target bridge arm conversion circuit and the second target device 1010.

[0160] The second target device 1010 can be a powered vehicle or other device that needs to be charged. In the case that a fourth discharging instruction of the second target device 1010 is received, if it is determined that the charging voltage of the second target device 1010 is less than the output voltage of the battery module 102, it is determined that the second charging and discharging request is a second step-down discharging request. At this time, the target switch 103 is open, the second switch S2 and the third switch S3 are closed, and the upper bridge arm of the first bridge arm A1 in the first target bridge arm conversion circuit is conductive. The current output by the positive electrode of the battery module 102 passes through the second switch S2, the upper bridge arm of the first bridge arm A1 in the first target bridge arm conversion circuit, the first winding A2 in the first target bridge arm conversion circuit, the second target device 1010, the third switch S3, and returns to the negative electrode of the battery module 102 in sequence.

[0161] Optionally, Fig. 15 is a circuit diagram of a charging and discharging circuit according to a thirteenth embodiment of the present disclosure. As shown in Fig. 15, in a second specified time period of each eighth control period, the controller 101 is further configured to control the target switch 103, the second switch S2 and the third switch S3 to be open, the upper bridge arm of the first bridge arm A1 in the first target bridge arm conversion circuit to be non-conductive, and the lower bridge arm of the first bridge arm A1 in the first target bridge arm conversion circuit to be conductive in the second specified time period of each eighth control period, so as to form a fourth step-down discharging path between the first winding A2 in the first target bridge arm conversion circuit and the second target device 1010, and the lower bridge arm of the first bridge arm A1 in the first target bridge arm conversion circuit, so as to cause the first winding A2 in the first target bridge arm conversion circuit to discharge the second target device 1010.

[0162] The second target device 1010 can be a vehicle or other device that needs to be charged. In the case of receiving a fourth discharge instruction, if it is determined that the charging voltage of the second target device 1010 is less than the output voltage of the battery module 102, it is determined that the second charging and discharging request is a second step-down discharge request. At this time, the target switch 103, the second switch S2 and the third switch S3 are disconnected, the upper bridge arm of the first bridge arm A1 in the first target bridge arm conversion circuit is cut off, and the lower bridge arm of the first bridge arm A1 in the first target bridge arm conversion circuit is turned on. In the second specified time period of each eighth control period, the first winding A2 in the first target bridge arm conversion circuit discharges the second target device 1010. The current output from the positive electrode of the first winding A2 in the first target bridge arm conversion circuit passes through the second target device 1010 and the lower bridge arm of the first bridge arm A1 in the first target bridge arm conversion circuit in turn, and returns to the negative electrode of the first winding A2 in the first target bridge arm conversion circuit.

[0163] The above technical solution, in the first specified time period of each eighth control period, the battery module discharges the first winding A2 in the first target bridge arm conversion circuit and the second target device through the third step-down discharge path; in the second specified time period of each eighth control period, the first winding in the first target bridge arm conversion circuit discharges the second target device through the fourth step-down discharge path. In the case where the charging voltage of the second target device is less than the output voltage of the battery module, discharging the second target device at a step-down voltage can effectively improve the flexibility of vehicle charging and discharging, thereby facilitating the improvement of user experience and satisfaction.

[0164] FIG. 16 is a circuit diagram of a charging and discharging circuit according to a fourteenth embodiment of the present disclosure. As shown in FIG. 16, the charging and discharging circuit further includes a second motor control assembly 108 and a fourth switch S4, one end of the second motor control assembly 108 is connected with the first motor control assembly 107 through the fourth switch S4, and the other end is connected with the battery module 102,

[0165] The controller 101 is configured to control the second motor control assembly 108 to form a charging path or a discharging path with the battery module 102 and the second target device 1010 according to the second charging and discharging request.

[0166] The second target device 1010 can be a charging pile or other charging device with charging function. The second motor control assembly 108 can be a single-phase motor, a three-phase motor, or other types of motors.

[0167] Optionally, still taking Fig. 16 as an example, the second motor control assembly 108 includes one or more second bridge arm conversion circuits, each of which includes a second bridge arm and a second winding;

[0168] For each second bridge arm conversion circuit, a first end of the second winding is connected to a midpoint of the second bridge arm, a second end of the second winding is connected to a second end of the first winding through the fourth switch S4, and a common end of the second bridge arm is connected to a common end of the first bridge arm through the second switch S2 and the third switch S3.

[0169] The controller 101 is configured to determine at least one second target bridge arm conversion circuit from the one or more second bridge arm conversion circuits according to the second charge-discharge request, and form a charge path or a discharge path between the at least one second target bridge arm conversion circuit, the battery module 102 and the second target device 1010.

[0170] It should be noted that the second motor control assembly 108 can be a single-phase motor, a three-phase motor, or other types of motors. When the second motor control assembly 108 is a single-phase motor, the second motor control assembly 108 includes one second bridge arm conversion circuit. When the second motor control assembly 108 is a three-phase motor, the second motor control assembly 108 includes three second bridge arm conversion circuits. In the case of a single-phase motor, the second bridge arm conversion circuit in the single-phase motor is directly taken as the second target bridge arm conversion circuit. In the case of a three-phase motor, one of the second bridge arm conversion circuits can be taken as the second target bridge arm conversion circuit, two of the second bridge arm conversion circuits can be taken as the second target bridge arm conversion circuit, or all of the three second bridge arm conversion circuits can be taken as the second target bridge arm conversion circuit.

[0171] Optionally, still taking Fig. 16 as an example, the controller 101 is configured to, in the case that the second charge-discharge request is a third boost charging request, control the third switch S3 and the fourth switch S4 to be closed, the target switch 103 and the second switch S2 to be disconnected, and a lower bridge arm of the second bridge arm B1 in the second target bridge arm conversion circuit to be conductive in a first specified time period of each ninth control period, so as to form a fifth path between the second target device 1010, the fourth switch S4, the second winding B2 in the second target bridge arm conversion circuit, the lower bridge arm of the second bridge arm B1 in the second target bridge arm conversion circuit, and the third switch S3, so as to enable the second target device 1010 to charge the second winding B2 in the second target bridge arm conversion circuit.

[0172] The second target device 1010 can be a charging pile or other charging device with charging function. In the case of receiving the fifth charging instruction, if it is determined that the output voltage of the second target device 1010 is less than the charging voltage of the battery module 102, it is determined that the second charging and discharging request is a third step-up charging request. At this time, the third switch S3 and the fourth switch S4 are closed, the target switch 103 and the second switch S2 are disconnected, and the lower bridge arm of the second bridge arm B1 in the second target bridge arm conversion circuit is turned on. The current output from the positive electrode of the second target device 1010 passes through the fourth switch S4, the second winding B2 in the second target bridge arm conversion circuit, the lower bridge arm of the second bridge arm B1 in the second target bridge arm conversion circuit, the third switch S3, and returns to the negative electrode of the second target device 1010 in sequence.

[0173] Alternatively, FIG. 17 is a circuit diagram of a charging and discharging circuit according to a fifteenth embodiment of the present disclosure. As shown in FIG. 17, in the second specified time period of each ninth control period, the controller 101 is further configured to control the third switch S3 and the fourth switch S4 to be closed, the target switch 103 and the second switch S2 to be disconnected, the upper bridge arm of the second bridge arm B1 in the second target bridge arm conversion circuit to be turned on, and the lower bridge arm of the second bridge arm B1 in the second target bridge arm conversion circuit to be turned off in the second specified time period of each ninth control period, so as to form a third step-up charging path between the second target device 1010, the fourth switch S4, the second winding B2 in the second target bridge arm conversion circuit, the upper bridge arm of the second bridge arm B1 in the second target bridge arm conversion circuit, the battery module 102, and the third switch S3, so that the second target device 1010 and the second winding B2 in the second target bridge arm conversion circuit charge the battery module 102.

[0174] The second target device 1010 can be a charging pile or other charging device with charging function. In the case of receiving the fifth charging instruction, if it is determined that the output voltage of the second target device 1010 is less than the charging voltage of the battery module 102, it is determined that the second charging and discharging request is a third step-up charging request. At this time, the third switch S3 and the fourth switch S4 are closed, the target switch 103 and the second switch S2 are disconnected, the upper bridge arm of the second bridge arm B1 in the second target bridge arm conversion circuit is turned on, and the lower bridge arm of the second bridge arm B1 in the second target bridge arm conversion circuit is turned off. In the second specified time period of each ninth control period, the second winding B2 in the second target bridge arm conversion circuit and the second target device 1010 charge the battery module 102. The current output from the positive electrode of the second target device 1010 passes through the fourth switch S4, the second winding B2 in the second target bridge arm conversion circuit, the upper bridge arm of the second bridge arm B1 in the second target bridge arm conversion circuit, the battery module 102, the third switch S3, and returns to the negative electrode of the second target device 1010.

[0175] The above technical solution, in the first specified time period of each ninth control period, the second target device charges the second winding in the second target bridge arm conversion circuit through the fifth path; in the second specified time period of each ninth control period, the second target device and the second winding in the second target bridge arm conversion circuit charge the battery module through the third step-up charging path. In the case where the output voltage of the second target device is less than the charging voltage of the battery module, the battery module is charged by step-up, without the need for additional charging conversion devices, which can effectively improve the convenience of vehicle charging, thereby facilitating the improvement of user experience and satisfaction.

[0176] FIG. 18 is a circuit diagram of a charging and discharging circuit according to a sixteenth embodiment of the present disclosure. As shown in FIG. 18, the controller 101 is configured to, in the case where the second charging and discharging request is a third step-down discharging request, control the third switch S3 and the fourth switch S4 to be closed, the target switch 103 and the second switch S2 to be disconnected, and the upper bridge arm of the second bridge arm B1 in the second target bridge arm conversion circuit to be turned on in the first specified time period of each tenth control period, so as to form a fifth step-down discharging path between the battery module 102, the upper bridge arm of the second bridge arm B1 in the second target bridge arm conversion circuit, the second winding B2 in the second target bridge arm conversion circuit, the fourth switch S4, the second target device 1010, and the third switch S3, so that the battery module 102 discharges the second winding B2 in the second target bridge arm conversion circuit and the second target device 1010.

[0177] The second target device 1010 can be a powered vehicle or other device that needs to be charged. In the case of receiving the fifth discharge instruction, if it is determined that the charging voltage of the second target device 1010 is less than the output voltage of the battery module 102, it is determined that the second charge and discharge request is a third step-down discharge request. At this time, the third switch S3 and the fourth switch S4 are closed, the target switch 103 and the second switch S2 are disconnected, and the upper bridge arm of the second bridge arm B1 in the second target bridge arm conversion circuit is turned on. The current output from the positive electrode of the battery module 102 passes through the upper bridge arm of the second bridge arm B1 in the second target bridge arm conversion circuit, the second winding B2 in the second target bridge arm conversion circuit, the fourth switch S4, the second target device 1010, the third switch S3, and returns to the negative electrode of the battery module 102.

[0178] Alternatively, FIG. 19 is a circuit diagram of a charge and discharge circuit according to a seventeenth embodiment of the present disclosure. As shown in FIG. 19, in the second specified time period of each tenth control period, the controller 101 is further configured to control the third switch S3 and the fourth switch S4 to be closed, the target switch 103 and the second switch S2 to be disconnected, the upper bridge arm of the second bridge arm B1 in the second target bridge arm conversion circuit to be turned off, and the lower bridge arm of the second bridge arm B1 in the second target bridge arm conversion circuit to be turned on, so as to form a sixth step-down discharge path between the second winding B2 in the second target bridge arm conversion circuit, the fourth switch S4, the second target device 1010, the third switch S3, and the lower bridge arm of the second bridge arm B1 in the second target bridge arm conversion circuit, so that the second winding B2 in the second target bridge arm conversion circuit discharges the second target device 1010.

[0179] The tenth control period can include only the first specified time period or the second specified time period, or can include both the first specified time period and the second specified time period. The second target device 1010 can be a vehicle or other device that needs to be charged. In the case of receiving the fifth discharge instruction, if it is determined that the charging voltage of the second target device 1010 is less than the output voltage of the battery module 102, it is determined that the second charge-discharge request is a third step-down discharge request. At this time, the third switch S3 and the fourth switch S4 are closed, the target switch 103 and the second switch S2 are disconnected, the upper bridge arm of the second bridge arm B1 in the second target bridge arm conversion circuit is cut off, and the lower bridge arm of the second bridge arm B1 in the second target bridge arm conversion circuit is turned on. In the second specified time period of each tenth control period, the second winding B2 in the second target bridge arm conversion circuit discharges the second target device 1010. The current output from the positive electrode of the second winding B2 in the second target bridge arm conversion circuit passes through the fourth switch S4, the second target device 1010, the third switch S3, and the lower bridge arm of the second bridge arm B1 in the second target bridge arm conversion circuit, and returns to the negative electrode of the second winding B2 in the second target bridge arm conversion circuit.

[0180] The above technical solution discharges the second winding in the second target bridge arm conversion circuit and the second target device through the fifth step-down discharge path in the first specified time period of each tenth control period. The second winding in the second target bridge arm conversion circuit discharges the second target device 1010 through the sixth step-down discharge path in the second specified time period of each tenth control period. In the case where the charging voltage of the second target device is less than the output voltage of the battery module, discharging the second target device through step-down discharge can effectively improve the flexibility of vehicle charge and discharge, thereby facilitating the improvement of user experience and satisfaction.

[0181] Figure 20 is a circuit diagram of a charging and discharging circuit according to an eighteenth embodiment of the present disclosure. As shown in Figure 20, the controller 101 is configured to, in the case that the second charging and discharging request is a third step-up discharging request, control the target switch 103 and the second switch S2 to be open, the third switch S3 and the fourth switch S4 to be closed, the lower bridge arm of the first bridge arm A1 in the first target bridge arm conversion circuit to be conductive, and the upper bridge arm of the second bridge arm B1 in the second target bridge arm conversion circuit to be conductive in a first specified time period of each eleventh control period, so as to form a sixth path between the battery module 102, the upper bridge arm of the second bridge arm B1 in the second target bridge arm conversion circuit, the second winding B2 in the second target bridge arm conversion circuit, the fourth switch S4, the first winding A2 in the first target bridge arm conversion circuit, the lower bridge arm of the first bridge arm A1 in the first target bridge arm conversion circuit, and the third switch S3, so that the battery module 102 discharges the first winding A2 in the first target bridge arm conversion circuit and the second winding B2 in the second target bridge arm conversion circuit.

[0182] In the case that the sixth discharging instruction is received, if it is determined that the charging voltage of the second target device 1010 is greater than the output voltage of the battery module 102, it is determined that the second charging and discharging request is a third step-up discharging request. At this time, the target switch 103 and the second switch S2 are open, the third switch S3 and the fourth switch S4 are closed, and the lower bridge arm of the first bridge arm A1 in the first target bridge arm conversion circuit is conductive, and the upper bridge arm of the second bridge arm B1 in the second target bridge arm conversion circuit is conductive. The current output by the positive electrode of the battery module 102 passes through the upper bridge arm of the second bridge arm B1 in the second target bridge arm conversion circuit, the second winding B2 in the second target bridge arm conversion circuit, the fourth switch S4, the first winding A2 in the first target bridge arm conversion circuit, the lower bridge arm of the first bridge arm A1 in the first target bridge arm conversion circuit, and the third switch S3 in sequence, and returns to the negative electrode of the battery module 102.

[0183] Optionally, FIG. 21 is a circuit diagram of a charging and discharging circuit according to a nineteenth embodiment of the present disclosure. As shown in FIG. 21, during the second specified time period of each eleventh control period, the controller 101 is further configured to control the target switch 103 and the second switch S2 to be open, the third switch S3 and the fourth switch S4 to be closed, the upper bridge arm of the first bridge arm Al in the first target bridge arm conversion circuit to be conductive, the lower bridge arm of the first bridge arm Al in the first target bridge arm conversion circuit to be non-conductive, the upper bridge arm of the second bridge arm Bl in the second target bridge arm conversion circuit to be conductive, and the lower bridge arm of the second bridge arm Bl in the second target bridge arm conversion circuit to be non-conductive, so as to form a third voltage boosting and discharging path between the battery module 102, the upper bridge arm of the second bridge arm Bl in the second target bridge arm conversion circuit, the second winding B2 in the second target bridge arm conversion circuit, the fourth switch S4, the first winding A2 in the first target bridge arm conversion circuit, the upper bridge arm of the first bridge arm Al in the first target bridge arm conversion circuit, the second target device 1010, and the third switch S3, so as to discharge the battery module 102, the first winding A2 in the first target bridge arm conversion circuit, and the second winding B2 in the second target bridge arm conversion circuit to the first target device 106.

[0184] The eleventh control period can include only the first specified time period, or can include the first specified time period and the second specified time period. When the current power of the second target device 1010 in the second specified time period is greater than or equal to the power threshold of the second target device 1010, the eleventh control period can include only the first specified time period. The first target device 106 can be a powered vehicle or other device that needs to be charged. When the sixth discharge instruction is received, if it is determined that the charging voltage of the second target device 1010 is greater than the output voltage of the battery module 102, it is determined that the second charge and discharge request is a third step-up discharge request. At this time, the target switch 103 and the second switch S2 are open, the third switch S3 and the fourth switch S4 are closed, the upper bridge arm of the first bridge arm A1 in the first target bridge arm conversion circuit is turned on, the lower bridge arm of the first bridge arm A1 in the first target bridge arm conversion circuit is turned off, the upper bridge arm of the second bridge arm B1 in the second target bridge arm conversion circuit is turned on, and the lower bridge arm of the second bridge arm B1 in the second target bridge arm conversion circuit is turned off. In the second specified time period of each eleventh control period, the first winding A2 in the first target bridge arm conversion circuit and the second winding B2 in the second target bridge arm conversion circuit, and the battery module 102 discharge the second target device 1010. The current output from the positive electrode of the battery module 102 passes through the upper bridge arm of the second bridge arm B1 in the second target bridge arm conversion circuit, the second winding B2 in the second target bridge arm conversion circuit, the fourth switch S4, the first winding A2 in the first target bridge arm conversion circuit, the upper bridge arm of the first bridge arm A1 in the first target bridge arm conversion circuit, the second target device 1010, and the third switch S3, and returns to the negative electrode of the battery module 102.

[0185] The above technical solution discharges the first winding in the first target bridge arm conversion circuit and the second winding in the second target bridge arm conversion circuit through the sixth path in the first specified time period of each eleventh control period; and discharges the second target device through the third step-up discharge path by the battery module, the first winding in the first target bridge arm conversion circuit, and the second winding in the second target bridge arm conversion circuit in the second specified time period of each eleventh control period. When the charging voltage of the second target device is greater than the output voltage of the battery module, the second target device is discharged by step-up, which can effectively improve the flexibility of vehicle charging and discharging, thereby facilitating the improvement of user experience and satisfaction.

[0186] Fig. 22 is a circuit diagram of a charging and discharging circuit according to a twentieth embodiment of the present disclosure. As shown in Fig. 22, the controller 101 is configured to, in the case that the second charging and discharging request is a fourth step-down discharging request, control the target switch 103 and the second switch S2 to be open, the third switch S3 and the fourth switch S4 to be closed, the lower bridge arm of the first bridge arm Al in the first target bridge arm conversion circuit to be conductive, and the upper bridge arm of the second bridge arm Bl in the second target bridge arm conversion circuit to be conductive in a first specified time period of each twelfth control period, so as to form a seventh step-down discharging path between the battery module 102, the upper bridge arm of the second bridge arm Bl in the second target bridge arm conversion circuit, the second winding B2 in the second target bridge arm conversion circuit, the fourth switch S4, the first winding A2 in the first target bridge arm conversion circuit, and the lower bridge arm of the first bridge arm Al in the first target bridge arm conversion circuit, so as to make the battery module 102 discharge the first winding A2 in the first target bridge arm conversion circuit and the second winding B2 in the second target bridge arm conversion circuit.

[0187] In the case that the seventh discharging instruction is received, if it is determined that the charging voltage of the second target device 1010 is less than the output voltage of the battery module 102, it is determined that the second charging and discharging request is a fourth step-down discharging request. At this time, the target switch 103 and the second switch S2 are open, the third switch S3 and the fourth switch S4 are closed, and the lower bridge arm of the first bridge arm Al in the first target bridge arm conversion circuit is conductive, and the upper bridge arm of the second bridge arm Bl in the second target bridge arm conversion circuit is conductive. The current output by the positive electrode of the battery module 102 passes through the upper bridge arm of the second bridge arm Bl in the second target bridge arm conversion circuit, the second winding B2 in the second target bridge arm conversion circuit, the fourth switch S4, the first winding A2 in the first target bridge arm conversion circuit, and the lower bridge arm of the first bridge arm Al in the first target bridge arm conversion circuit in sequence, and returns to the negative electrode of the battery module 102.

[0188] Optionally, FIG. 23 is a circuit diagram of a charging and discharging circuit according to a twenty-first embodiment of the present disclosure. As shown in FIG. 23, in the second specified time period of each twelfth control period, the controller 101 is further configured to control the target switch 103 and the second switch S2 to be open, the third switch S3 and the fourth switch S4 to be closed, the lower bridge arm of the first bridge arm A1 in the first target bridge arm conversion circuit to be cut off, the upper bridge arm of the first bridge arm A1 in the first target bridge arm conversion circuit to be turned on, the upper bridge arm of the second bridge arm B1 in the second target bridge arm conversion circuit to be cut off, and the lower bridge arm of the second bridge arm B1 in the second target bridge arm conversion circuit to be turned on, so as to form an eighth voltage reduction discharging path between the second winding B2 in the second target bridge arm conversion circuit, the fourth switch S4, the first winding A2 in the first target bridge arm conversion circuit, the upper bridge arm of the first bridge arm A1 in the first target bridge arm conversion circuit, the second target device 1010, the third switch S3, and the lower bridge arm of the second bridge arm B1 in the second target bridge arm conversion circuit, so as to discharge the first winding A2 in the first target bridge arm conversion circuit and the second winding B2 in the second target bridge arm conversion circuit to the second target device 1010.

[0189] The second target device 1010 can be a vehicle or other device requiring charging. When the seventh discharging instruction is received, if it is determined that the charging voltage of the second target device 1010 is less than the output voltage of the battery module 102, it is determined that the second charging and discharging request is a fourth voltage reduction discharging request. At this time, the target switch 103 and the second switch S2 are open, the third switch S3 and the fourth switch S4 are closed, the lower bridge arm of the first bridge arm A1 in the first target bridge arm conversion circuit is cut off, the upper bridge arm of the first bridge arm A1 in the first target bridge arm conversion circuit is turned on, the upper bridge arm of the second bridge arm B1 in the second target bridge arm conversion circuit is cut off, and the lower bridge arm of the second bridge arm B1 in the second target bridge arm conversion circuit is turned on. In the second specified time period of each twelfth control period, the first winding A2 in the first target bridge arm conversion circuit and the second winding B2 in the second target bridge arm conversion circuit discharge to the second target device 1010. The current output from the positive electrode of the second winding B2 in the second target bridge arm conversion circuit passes through the fourth switch S4, the first winding A2 in the first target bridge arm conversion circuit, the upper bridge arm of the first bridge arm A1 in the first target bridge arm conversion circuit, the second target device 1010, the third switch S3, the lower bridge arm of the second bridge arm B1 in the second target bridge arm conversion circuit, and returns to the negative electrode of the second winding B2 in the second target bridge arm conversion circuit.

[0190] The above technical scheme, in the first specified time period of each twelfth control period, the battery module discharges the second winding in the second target bridge arm conversion circuit and the first winding in the first target bridge arm conversion circuit through the seventh voltage reduction discharging path; in the first specified time period of the twelfth control period, the battery module, the second winding in the second target bridge arm conversion circuit and the first winding in the first target bridge arm conversion circuit, discharge the second target device through the eighth voltage reduction discharging path. In the case that the second target device charging voltage is less than the output voltage of the battery module, the second target device is discharged by voltage reduction, which can effectively improve the flexibility of vehicle charging and discharging, thereby facilitating the improvement of user experience and satisfaction.

[0191] FIG. 24 is a circuit diagram of a charging and discharging circuit according to a twenty-second embodiment of the present disclosure. As shown in FIG. 24, the controller 101 is configured to control the first target bridge arm conversion circuit and / or the second target bridge arm conversion circuit to form a self-heating path with the battery module 102 to heat the battery module 102 when the current temperature of the battery module 102 is less than or equal to a preset temperature threshold.

[0192] In the vehicle, the battery module 102 is usually equipped with a temperature sensor for real-time monitoring of the current temperature of the battery module 102. The temperature sensor can be a thermistor, a thermocouple or a digital temperature sensor.

[0193] It should be noted that the battery module 102 will monitor the current temperature of the battery module 102 in real time, and when the current temperature is greater than the preset temperature threshold, the self-heating path is disconnected to stop the self-heating process to avoid damage to the battery module 102 when the current temperature is greater than the preset temperature threshold.

[0194] Optionally, still taking FIG. 24 as an example, during the first specified time period of each first self-heating control period, the controller 101 is configured to, according to a first self-heating request, determine a first standby bridge arm conversion circuit and a second standby bridge arm conversion circuit from the plurality of first bridge arm conversion circuits during the first specified time period of each first self-heating control period, and control the target switch 103 and the fourth switch S4 to be open, the second switch S2 and the third switch S3 to be closed, the upper bridge arm of the first bridge arm D1 in the first standby bridge arm conversion circuit to be conductive, and the lower bridge arm of the first bridge arm E1 in the second standby bridge arm conversion circuit to be conductive, so as to form a first self-heating path between the battery module 102, the second switch S2, the upper bridge arm of the first bridge arm D1 in the first standby bridge arm conversion circuit, the first winding D2 in the first standby bridge arm conversion circuit, the first winding E2 in the second standby bridge arm conversion circuit, the lower bridge arm of the first bridge arm E1 in the second standby bridge arm conversion circuit, and the third switch S3, and heat the battery module 102.

[0195] In the case where the first self-heating request is received, the target switch 103 and the fourth switch S4 are controlled to be open, the second switch S2 and the third switch S3 are controlled to be closed, the upper bridge arm of the first bridge arm D1 in the first standby bridge arm conversion circuit is controlled to be conductive, and the lower bridge arm of the first bridge arm E1 in the second standby bridge arm conversion circuit is controlled to be conductive. During the first specified time period of the first self-heating control period, the current of the positive output of the battery module 102 passes through the second switch S2, the upper bridge arm of the first bridge arm in the first standby bridge arm conversion circuit, the first winding D2 in the first standby bridge arm conversion circuit, the first winding E2 in the second standby bridge arm conversion circuit, the lower bridge arm of the first bridge arm E1 in the second standby bridge arm conversion circuit, and the third switch S3 in turn, and returns to the negative terminal of the battery module 102.

[0196] It should be noted that the first motor control assembly 107 includes at least two first bridge arm conversion circuits. In the case where the first motor control assembly 107 is a two-phase driving motor, one of the two first bridge arm conversion circuits in the two-phase driving motor is directly taken as the first standby bridge arm conversion circuit, and the other first bridge arm conversion circuit in the two-phase driving motor is directly taken as the second standby bridge arm conversion circuit; in the case where the first motor control assembly 107 is a three-phase driving motor, one of the three first bridge arm conversion circuits can be selected as the first standby bridge arm conversion circuit, and one of the other two first bridge arm conversion circuits can be selected as the second standby bridge arm conversion circuit.

[0197] Optionally, FIG. 25 is a circuit diagram of a charging and discharging circuit according to a twenty-third embodiment of the present disclosure. As shown in FIG. 25, during the second specified time period of each first self-heating control period, the controller 101 is further configured to control the target switch 103 and the fourth switch S4 to be open, the second switch S2 and the third switch S3 to be closed, the upper bridge arm of the first bridge arm D1 in the first standby bridge arm conversion circuit to be cut off, the lower bridge arm of the first bridge arm D1 in the first standby bridge arm conversion circuit to be turned on, the upper bridge arm of the first bridge arm E1 in the second standby bridge arm conversion circuit to be turned on, and the lower bridge arm of the first bridge arm E1 in the second standby bridge arm conversion circuit to be cut off, so as to form a second self-heating path between the first winding D2 in the first standby bridge arm conversion circuit, the first winding E2 in the second standby bridge arm conversion circuit, the upper bridge arm of the first bridge arm E1 in the second standby bridge arm conversion circuit, the second switch S2, the battery module 102, the third switch S3, and the lower bridge arm of the first bridge arm D1 in the first standby bridge arm conversion circuit, so as to heat the battery module 102.

[0198] In the first self-heating control period, the first self-heating control period can include the first specified time period or the second specified time period, or include both the first specified time period and the second specified time period. In the first specified time period, if it is determined that the current temperature is greater than or equal to the preset temperature threshold, the first self-heating control period can only include the first specified time period. In the second specified time period, if it is determined that the current temperature is greater than or equal to the preset temperature threshold, the first self-heating control period can only include the second specified time period. In the second specified time period of the first self-heating control period, the target switch 103 and the fourth switch S4 are open, the second switch S2 and the third switch S3 are closed, the upper bridge arm of the first bridge arm D1 in the first standby bridge arm conversion circuit is cut off, the lower bridge arm of the first bridge arm D1 in the first standby bridge arm conversion circuit is turned on, the upper bridge arm of the first bridge arm E1 in the second standby bridge arm conversion circuit is turned on, and the lower bridge arm of the first bridge arm E1 in the second standby bridge arm conversion circuit is cut off. In the second specified time period of the first self-heating control period, the current output from the positive electrode of the first winding D2 in the first standby bridge arm conversion circuit passes through the upper bridge arm of the first bridge arm E1 in the second standby bridge arm conversion circuit, the second switch S2, the battery module 102, the third switch S3, and the lower bridge arm of the first bridge arm D1 in the first standby bridge arm conversion circuit, and returns to the negative electrode of the first winding D2 in the first standby bridge arm conversion circuit.

[0199] The above technical solution, when the current temperature of the battery module is less than or equal to a preset temperature threshold, heats the battery module through the first self-heating path and the second self-heating path, which can maintain the performance of the battery module and extend its service life.

[0200] Figure 26 is a circuit diagram of a charging and discharging circuit according to the twenty-fourth embodiment of this disclosure. As shown in Figure 26, the controller 101 is used to determine a first preset bridge arm switching circuit and a second preset bridge arm switching circuit from a plurality of second bridge arm switching circuits within a first specified time period of each second self-heating control cycle according to a second self-heating request, and control the target switch 103, the second switch S2, the third switch S3 and the fourth switch S4 to be disconnected. The upper bridge arm of the second bridge arm F1 in the first preset bridge arm switching circuit is turned on, and the lower bridge arm of the second bridge arm G1 in the second preset bridge arm switching circuit is turned on, so as to form a third self-heating path between the battery module 102 and the upper bridge arm of the second bridge arm F1 in the first preset bridge arm switching circuit, the second winding F2 in the first preset bridge arm switching circuit, the second winding G2 in the second preset bridge arm switching circuit, and the lower bridge arm of the second bridge arm G1 in the second preset bridge arm switching circuit, so as to heat the battery module 102.

[0201] Upon receiving the second self-heating request, the target switch 103, the second switch S2, the third switch S3, and the fourth switch S4 are disconnected. The upper arm of the second bridge arm F1 in the first preset bridge arm switching circuit is turned on, and the lower arm of the second bridge arm G1 in the second preset bridge arm switching circuit is turned on. During the first specified time period of the second self-heating control cycle, the current output from the positive terminal of the battery module 102 sequentially passes through the upper arm of the second bridge arm F1 in the first preset bridge arm switching circuit, the second winding F2 in the first preset bridge arm switching circuit, the second winding G2 in the second preset bridge arm switching circuit, and the lower arm of the second bridge arm G1 in the second preset bridge arm switching circuit, returning to the negative terminal of the battery module 102.

[0202] It should be noted that the second motor electric control assembly 108 at least includes two second bridge arm conversion circuits. In the case of the second motor electric control assembly 108 being a two-phase driving motor, one of the two second bridge arm conversion circuits in the two-phase driving motor is directly taken as the first preset bridge arm conversion circuit, and the other second bridge arm conversion circuit in the two-phase driving motor is directly taken as the second preset bridge arm conversion circuit; in the case of the second motor electric control assembly 108 being a three-phase driving motor, one of the three second bridge arm conversion circuits can be selected as the first preset bridge arm conversion circuit; and the other one of the two second bridge arm conversion circuits can be selected as the second preset bridge arm conversion circuit.

[0203] Optionally, FIG. 27 is a circuit diagram of a charging and discharging circuit according to a twenty-fifth embodiment of the present disclosure. As shown in FIG. 27, during the second specified time period of each second self-heating control period, the controller 101 is further configured to control the target switch 103, the second switch S2, the third switch S3 and the fourth switch S4 to be turned off, the upper bridge arm of the second bridge arm F1 in the first preset bridge arm conversion circuit to be turned off, the lower bridge arm of the second bridge arm F1 in the first preset bridge arm conversion circuit to be turned on, the upper bridge arm of the second bridge arm G1 in the second preset bridge arm conversion circuit to be turned on, and the lower bridge arm of the second bridge arm G1 in the second preset bridge arm conversion circuit to be turned off, so as to form a fourth self-heating path between the second winding F2 in the first preset bridge arm conversion circuit, the second winding G2 in the second preset bridge arm conversion circuit, the upper bridge arm of the second bridge arm G1 in the second preset bridge arm conversion circuit, the battery module 102 and the lower bridge arm of the second bridge arm F1 in the first preset bridge arm conversion circuit, so as to heat the battery module 102.

[0204] The second self-heating control period can include a first specified time period or a second specified time period, or can include both the first specified time period and the second specified time period. In the first specified time period, if it is determined that the current temperature is greater than or equal to the preset temperature threshold, the second self-heating control period can only include the first specified time period. In the second specified time period, if it is determined that the current temperature is greater than or equal to the preset temperature threshold, the first self-heating control period can only include the second specified time period. In the second specified time period of each second self-heating control period, the target switch 103, the second switch S2, the third switch S3, and the fourth switch S4 are turned off, the upper bridge arm of the second bridge arm F1 in the first preset bridge arm conversion circuit is turned off, the lower bridge arm of the second bridge arm F1 in the first preset bridge arm conversion circuit is turned on, the upper bridge arm of the second bridge arm G1 in the second preset bridge arm conversion circuit is turned on, and the lower bridge arm of the second bridge arm G1 in the second preset bridge arm conversion circuit is turned off. In the second specified time period of each second self-heating control period, the current output from the positive electrode of the second winding F2 in the first preset bridge arm conversion circuit passes through, in sequence, the second winding G2 in the second preset bridge arm conversion circuit, the upper bridge arm of the second bridge arm G1 in the second preset bridge arm conversion circuit, the battery module 102, and the lower bridge arm of the second bridge arm F1 in the first preset bridge arm conversion circuit, and returns to the negative electrode of the second winding F2 in the first preset bridge arm conversion circuit.

[0205] The above technical solution can heat the battery module through the third self-heating path and the fourth self-heating path when the current temperature of the battery module is less than or equal to the preset temperature threshold, thereby maintaining the performance of the battery module and prolonging the service life of the battery module.

[0206] FIG. 28 is a circuit diagram of a charging and discharging circuit according to a twenty-sixth embodiment of the present disclosure. As shown in FIG. 28, the controller 101 is configured to control, according to a third self-heating request, the target switch 103 and the second switch S2 to be turned off, the third switch S3 and the fourth switch S4 to be closed, the lower bridge arm of the first bridge arm A1 in the first target bridge arm conversion circuit to be turned on, and the upper bridge arm of the second bridge arm B1 in the second target bridge arm conversion circuit to be turned on in a first specified time period of each third self-heating control period, so as to form a fifth self-heating path between the battery module 102 and the upper bridge arm of the second bridge arm B1 in the second target bridge arm conversion circuit, the second winding B2 in the second target bridge arm conversion circuit, the fourth switch S4, the first winding A2 in the first target bridge arm conversion circuit, the lower bridge arm of the first bridge arm A1 in the first target bridge arm conversion circuit, and the third switch S3, and heat the battery module 102.

[0207] In the case where the third self-heating request is received, the target switch 103 and the second switch S2 are controlled to be open, the third switch S3 and the fourth switch S4 are controlled to be closed, the lower bridge arm of the first bridge arm A1 in the first target bridge arm conversion circuit is controlled to be conductive, and the upper bridge arm of the second bridge arm B1 in the second target bridge arm conversion circuit is controlled to be conductive. In the first specified time period of each third self-heating control period, the current of the positive electrode output of the battery module 102 passes through the upper bridge arm of the second bridge arm B1 in the second target bridge arm conversion circuit, the second winding B2 in the second target bridge arm conversion circuit, the fourth switch S4, the first winding A2 in the first target bridge arm conversion circuit, the lower bridge arm of the first bridge arm A1 in the first target bridge arm conversion circuit, and the third switch S3 in turn, and returns to the negative electrode terminal of the battery module 102.

[0208] Optionally, FIG. 29 is a circuit diagram of a charging and discharging circuit according to a twenty-seventh embodiment of the present disclosure. As shown in FIG. 29, in the second specified time period of each third self-heating control period, the controller 101 is further configured to control the target switch 103 and the third switch S3 to be open, the second switch S2 and the fourth switch S4 to be closed, and control the upper bridge arm of the first bridge arm A1 in the first target bridge arm conversion circuit to be conductive, the lower bridge arm of the first bridge arm A1 in the first target bridge arm conversion circuit to be non-conductive, the upper bridge arm of the second bridge arm B1 in the second target bridge arm conversion circuit to be non-conductive, and the lower bridge arm of the second bridge arm B1 in the second target bridge arm conversion circuit to be conductive, so as to form a sixth self-heating path between the first winding A2 in the first target bridge arm conversion circuit, the upper bridge arm of the first bridge arm A1 in the first target bridge arm conversion circuit, the second switch S2, the battery module 102, the lower bridge arm of the second bridge arm B1 in the second target bridge arm conversion circuit, the second winding B2 in the second target bridge arm conversion circuit, and the fourth switch S4, and heat the battery module 102.

[0209] The third self-heating control period can include a first specified time period or a second specified time period, or include both the first specified time period and the second specified time period. In the first specified time period, if it is determined that the current temperature is greater than or equal to a preset temperature threshold, the third self-heating control period can only include the first specified time period. In the second specified time period, if it is determined that the current temperature is greater than or equal to a preset temperature threshold, the third self-heating control period can only include the second specified time period. In the second specified time period of each third self-heating control period, the target switch 103 and the third switch S3 are disconnected, the second switch S2 and the fourth switch S4 are closed, the upper bridge arm of the first bridge arm A1 in the first target bridge arm conversion circuit is turned on, the lower bridge arm of the first bridge arm A1 in the first target bridge arm conversion circuit is turned off, the upper bridge arm of the second bridge arm B1 in the second target bridge arm conversion circuit is turned off, and the lower bridge arm of the second bridge arm B1 in the second target bridge arm conversion circuit is turned on. In the second specified time period of each third self-heating control period, the current output from the positive electrode of the first winding A2 in the first target bridge arm conversion circuit passes through the upper bridge arm of the first bridge arm A1 in the first target bridge arm conversion circuit, the second switch S2, the battery module 102, the lower bridge arm of the second bridge arm B1 in the second target bridge arm conversion circuit, the second winding B2 in the second target bridge arm conversion circuit, and the fourth switch S4, and returns to the negative electrode of the first winding A2 in the first target bridge arm conversion circuit.

[0210] The above technical solution can heat the battery module through the fifth self-heating path and the sixth self-heating path when the current temperature of the battery module is less than or equal to a preset temperature threshold, thereby maintaining the performance of the battery module and prolonging the service life of the battery module.

[0211] Fig. 30 is a circuit diagram of a charging and discharging circuit according to a twenty-eighth embodiment of the present disclosure. As shown in Fig. 30, the controller 101 is configured to, in response to a fourth self-heating request, control the target switch 103 and the third switch S3 to be open, the second switch S2 and the fourth switch S4 to be closed, the upper bridge arm of the first bridge arm A1 in the first target bridge arm conversion circuit to be conductive, and the lower bridge arm of the second bridge arm B1 in the second target bridge arm conversion circuit to be conductive, so as to form a seventh self-heating path between the battery module 102, the second switch S2, the upper bridge arm of the first bridge arm A1 in the first target bridge arm conversion circuit, the first winding A2 in the first target bridge arm conversion circuit, the second winding B2 in the second target bridge arm conversion circuit, the fourth switch S4, and the lower bridge arm of the second bridge arm B1 in the second target bridge arm conversion circuit, and heat the battery module 102.

[0212] In response to the fourth self-heating request, the controller 101 controls the target switch 103 and the third switch S3 to be open, the second switch S2 and the fourth switch S4 to be closed, the upper bridge arm of the first bridge arm A1 in the first target bridge arm conversion circuit to be conductive, and the lower bridge arm of the second bridge arm B1 in the second target bridge arm conversion circuit to be conductive. In the first specified time period of the third self-heating control period, the current output from the positive electrode of the battery module 102 passes through the second switch S2, the upper bridge arm of the first bridge arm A1 in the first target bridge arm conversion circuit, the first winding A2 in the first target bridge arm conversion circuit, the second winding B2 in the second target bridge arm conversion circuit, the fourth switch S4, and the lower bridge arm of the second bridge arm B1 in the second target bridge arm conversion circuit in sequence, and returns to the negative electrode of the battery module 102.

[0213] Optionally, Fig. 31 is a circuit diagram of a charging and discharging circuit according to a twenty-ninth embodiment of the present disclosure. As shown in Fig. 31, during the second specified time period of each fourth self-heating control period, the controller 101 is further configured to control the target switch 103 and the second switch S2 to be open, the third switch S3 and the fourth switch S4 to be closed, the upper bridge arm of the first bridge arm A1 in the first target bridge arm conversion circuit to be off, the lower bridge arm of the first bridge arm A1 in the first target bridge arm conversion circuit to be on, the upper bridge arm of the second bridge arm B1 in the second target bridge arm conversion circuit to be on, and the lower bridge arm of the second bridge arm B1 in the second target bridge arm conversion circuit to be off, so as to form an eighth self-heating path between the first winding A2 in the first target bridge arm conversion circuit, the second winding B2 in the second target bridge arm conversion circuit, the upper bridge arm of the second bridge arm B1 in the second target bridge arm conversion circuit, the battery module 102, the third switch S3, and the lower bridge arm of the first bridge arm A1 in the first target bridge arm conversion circuit, and heat the battery module 102.

[0214] The fourth self-heating control period can include the first specified time period or the second specified time period, or include both the first specified time period and the second specified time period. During the first specified time period, if it is determined that the current temperature is greater than or equal to the preset temperature threshold, the fourth self-heating control period can only include the first specified time period. During the second specified time period, if it is determined that the current temperature is greater than or equal to the preset temperature threshold, the fourth self-heating control period can only include the second specified time period. During the second specified time period of the fourth self-heating control period, the controller 101 controls the target switch 103 and the second switch S2 to be open, the third switch S3 and the fourth switch S4 to be closed, the upper bridge arm of the first bridge arm A1 in the first target bridge arm conversion circuit to be off, the lower bridge arm of the first bridge arm A1 in the first target bridge arm conversion circuit to be on, the upper bridge arm of the second bridge arm B1 in the second target bridge arm conversion circuit to be on, and the lower bridge arm of the second bridge arm B1 in the second target bridge arm conversion circuit to be off. During the second specified time period of the fourth self-heating control period, the current output from the positive electrode of the first winding A2 in the first target bridge arm conversion circuit passes through the fourth switch S4, the second winding B2 in the second target bridge arm conversion circuit, the upper bridge arm of the second bridge arm B1 in the second target bridge arm conversion circuit, the battery module 102, the third switch S3, and the lower bridge arm of the first bridge arm A1 in the first target bridge arm conversion circuit, and returns to the negative electrode of the first winding A2 in the first target bridge arm conversion circuit.

[0215] The above technical scheme can keep the performance of the battery module and prolong the service life of the battery module by heating the battery module through the seventh self-heating channel and the eighth self-heating channel when the current temperature of the battery module is less than or equal to the preset temperature threshold.

[0216] FIG. 32 is a block diagram of a vehicle 3200 according to an exemplary embodiment, as shown in FIG. 32, the vehicle includes the charging and discharging circuit 100 described above.

[0217] The preferred embodiments of the present disclosure are described in detail above with reference to the drawings, but the present disclosure is not limited to the specific details of the above-described embodiments. Various simple modifications can be made to the technical solutions of the present disclosure within the technical concept of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

[0218] In addition, it should be noted that each specific technical feature described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0219] Furthermore, various different embodiments of the present disclosure can also be combined in any manner as long as they do not contradict the idea of the present disclosure, and they should also be considered as disclosed by the present disclosure.

Claims

1. A charge-discharge circuit (100), characterized by, The charging and discharging circuit (100) comprises a controller (101), a first charging and discharging interface (105) connected to the controller (101), a battery module (102), a target motor electronic control assembly (104), and a target switch (103), one end of the target switch (103) being connected to the battery module (102), the other end being connected to the target motor electronic control assembly (104), the target motor electronic control assembly (104) being further connected to the first charging and discharging interface (105), and the first charging and discharging interface (105) being used for connecting a first target device (106). The controller (101) is configured to control the target switch (103) to be closed and control the target motor electronic control assembly (104) to form a charging path or a discharging path with the battery module (102) and the first target device (106) according to a first charging and discharging request.

2. The charge and discharge circuit (100) according to claim 1, characterized in that, The target motor electronic control assembly (104) comprises one or more target bridge arm conversion circuits, and each target bridge arm conversion circuit comprises a target bridge arm and a target winding. For each target bridge arm conversion circuit, a first end of the target winding is connected to a midpoint of the target bridge arm, a second end of the target winding is connected to the battery module (102) through the target switch (103), and a converging end of the target bridge arm is connected to the first charging and discharging interface (105).

3. The charging and discharging circuit (100) according to claim 1 or 2, characterized in that the controller (101) is configured to determine at least one specified bridge arm conversion circuit from the one or more target bridge arm conversion circuits according to the first charging and discharging request, and the target switch (103) forms a charging path or a discharging path with the battery module (102) and the first target device (106) through the specified bridge arm conversion circuit.

4. The charging and discharging circuit (100) according to any one of claims 1-3, characterized in that the controller (101) is configured to, in a case where the first charging and discharging request is a first step-down charging request, control the target switch (103) to be closed in a first specified time period of each first control period, and control an upper bridge arm of a target bridge arm in the specified bridge arm conversion circuit to be conductive, so as to form a first step-down charging path between the first target device (106), the upper bridge arm of the target bridge arm in the specified bridge arm conversion circuit, the target winding in the specified bridge arm conversion circuit, the target switch (103), and the battery module (102), so that the first target device (106) charges the target winding in the specified bridge arm conversion circuit and the battery module (102).

5. The charging and discharging circuit (100) according to any one of claims 1-4, characterized in that ​ ​ The controller (101) is further configured to control the target switch (103) to be closed, the upper bridge arm of the target bridge arm in the specified bridge arm conversion circuit to be turned off, and the lower bridge arm of the target bridge arm in the specified bridge arm conversion circuit to be turned on in a second specified time period of each first control period, so as to form a second voltage reduction charging path between the target switch (103), the battery module (102), and the lower bridge arm of the target bridge arm in the specified bridge arm conversion circuit, and charge the target winding in the specified bridge arm conversion circuit by using the battery module (102).

6. The charging and discharging circuit (100) according to any one of claims 1-5, characterized in that, The controller (101) is configured to control the target switch (103) to be closed and the lower bridge arm of the target bridge arm in the specified bridge arm conversion circuit to be turned on in a first specified time period of each second control period when the first charging and discharging request is a first voltage increase discharging request, so as to form a first path between the battery module (102), the target switch (103), the target winding in the specified bridge arm conversion circuit, and the lower bridge arm of the target bridge arm in the specified bridge arm conversion circuit, and discharge the target winding in the specified bridge arm conversion circuit by using the battery module (102).

7. The charging and discharging circuit (100) according to any one of claims 1-6, characterized in that, The controller (101) is further configured to control the target switch (103) to be closed, the upper bridge arm of the target bridge arm in the specified bridge arm conversion circuit to be turned on, and the lower bridge arm of the target bridge arm in the specified bridge arm conversion circuit to be turned off in a second specified time period of each second control period, so as to form a first voltage increase discharging path between the battery module (102), the target switch (103), the target winding in the specified bridge arm conversion circuit, the upper bridge arm of the target bridge arm in the specified bridge arm conversion circuit, and the first target device (106), and discharge the first target device (106) by using the battery module (102) and the target winding in the specified bridge arm conversion circuit.

8. The charge and discharge circuit (100) according to any one of claims 1 to 3, characterized in that The charging and discharging circuit (100) further comprises a first switch (S1), The first end of the first switch (S1) is connected to the second end of the target winding in the specified bridge arm conversion circuit, and the second end of the first switch (S1) is connected to the first charging and discharging interface (105).

9. The charging and discharging circuit (100) according to claim 3, 4, or 8, characterized in that, the controller (101) is configured to, in a case where the first charge-discharge request is a first step-up charging request, control the first switch (S1) to be closed, the target switch (103) to be open, and a lower bridge arm of a target bridge arm in the specified bridge arm conversion circuit to be conductive in a first specified time period of each third control period, so as to form a second path between the first target device (106) and the first switch (S1), a target winding in the specified bridge arm conversion circuit, and the lower bridge arm of the target bridge arm in the specified bridge arm conversion circuit, so as to enable the first target device (106) to charge the target winding in the specified bridge arm conversion circuit.

10. The charge-discharge circuit (100) according to claim 3, 4, 8 or 9, characterized in that, the controller (101) is further configured to, in a second specified time period of each third control period, control the first switch (S1) to be closed, the target switch (103) to be open, an upper bridge arm of a target bridge arm in the specified bridge arm conversion circuit to be conductive, and a lower bridge arm of the target bridge arm in the specified bridge arm conversion circuit to be non-conductive, so as to form a first step-up charging path between the first target device (106) and the first switch (S1), a target winding in the specified bridge arm conversion circuit, the upper bridge arm of the target bridge arm in the specified bridge arm conversion circuit, and the battery module (102), so as to enable the first target device (106) and the target winding in the specified bridge arm conversion circuit to charge the battery module (102).

11. The charge-discharge circuit (100) according to claim 3, 4 or 8, characterized in that, the controller (101) is configured to, in a case where the first charge-discharge request is a second step-down charging request, control the target switch (103) to be closed, the first switch (S1) to be open, and an upper bridge arm of a target bridge arm in the specified bridge arm conversion circuit to be conductive in a first specified time period of each fourth control period, so as to form a third step-down charging path between the first target device (106) and the upper bridge arm of the target bridge arm in the specified bridge arm conversion circuit, a target winding in the specified bridge arm conversion circuit, the target switch (103), and the battery module (102), so as to enable the first target device (106) to charge the target winding in the specified bridge arm conversion circuit and the battery module (102).

12. The charge-discharge circuit (100) according to claim 3, 4, 8 or 11, characterized in that, The controller (101) is further configured to control, in a second specified time period of each fourth control period, the target switch (103) to be closed, the first switch (S1) to be opened, an upper bridge arm of the target bridge arm in the specified bridge arm conversion circuit to be turned off, and a lower bridge arm of the target bridge arm in the specified bridge arm conversion circuit to be turned on, so as to form a fourth voltage reduction charging path between the target winding in the specified bridge arm conversion circuit, the target switch (103), the battery module (102), and the lower bridge arm of the target bridge arm in the specified bridge arm conversion circuit, and enable the target winding in the specified bridge arm conversion circuit to charge the battery module (102).

13. The charging and discharging circuit (100) according to claim 3, 4, or 8, characterized in that, The controller (101) is configured to, in the case that the first charging and discharging request is a second voltage increase discharging request, control, in a first specified time period of each fifth control period, the target switch (103) to be closed, the first switch (S1) to be opened, and a lower bridge arm of the target bridge arm in the specified bridge arm conversion circuit to be turned on, so as to form a third path between the battery module (102), the target switch (103), the target winding in the specified bridge arm conversion circuit, and the lower bridge arm of the target bridge arm in the specified bridge arm conversion circuit, and enable the battery module (102) to discharge the target winding in the specified bridge arm conversion circuit.

14. The charging and discharging circuit (100) according to claim 3, 4, 8, or 13, characterized in that, The controller (101) is further configured to, in a second specified time period of each fifth control period, control the target switch (103) to be closed, the first switch (S1) to be opened, an upper bridge arm of the target bridge arm in the specified bridge arm conversion circuit to be turned on, and a lower bridge arm of the target bridge arm in the specified bridge arm conversion circuit to be turned off, so as to form a second voltage increase discharging path between the battery module (102), the target switch (103), the target winding in the specified bridge arm conversion circuit, the upper bridge arm of the target bridge arm in the specified bridge arm conversion circuit, and the first target device (106), and enable the battery module (102) and the target winding in the specified bridge arm conversion circuit to discharge the first target device (106).

15. The charging and discharging circuit (100) according to claim 3, 4, or 8, characterized in that, The controller (101) is configured to, in a case where the first charging and discharging request is a first step-down discharging request, control the first switch (S1) to be closed, the target switch (103) to be open, and an upper bridge arm of a target bridge arm in the specified bridge arm conversion circuit to be conductive in a first specified time period of each sixth control period, so as to form a first step-down discharging path between the battery module (102), the upper bridge arm of the target bridge arm in the specified bridge arm conversion circuit, a target winding in the specified bridge arm conversion circuit, the first switch (S1), and the first target device (106), and to cause the battery module (102) to discharge the target winding in the specified bridge arm conversion circuit and the first target device (106).

16. The charging and discharging circuit (100) according to claim 3, 4 or 15, characterized in that, The controller (101) is further configured to, in a second specified time period of each sixth control period, control the first switch (S1) to be closed, the target switch (103) to be open, an upper bridge arm of a target bridge arm in the specified bridge arm conversion circuit to be non-conductive, and a lower bridge arm of the target bridge arm in the specified bridge arm conversion circuit to be conductive, so as to form a second step-down discharging path between the target winding in the specified bridge arm conversion circuit, the first switch (S1), the first target device (106), and the lower bridge arm of the target bridge arm in the specified bridge arm conversion circuit, and to cause the target winding in the specified bridge arm conversion circuit to charge the first target device (106).

17. The charge and discharge circuit (100) according to claim 3 or 4, characterized in that, The charging and discharging circuit (100) further comprises a first motor control assembly (107), and a second charging and discharging interface (109), one end of the first motor control assembly (107) being connected to the second charging and discharging interface (109), and the other end being connected to the battery module (102), the second charging and discharging interface (109) being configured to be connected to a second target device (1010), The controller (101) is further configured to control the first motor control assembly (107) to form a charging path or a discharging path with the battery module (102) and the second target device (1010) according to a second charging and discharging request.

18. The charge and discharge circuit (100) according to claim 3, 4 or 17, characterized in that, The charging and discharging circuit (100) further comprises a second switch (S2) and a third switch (S3), The first motor control assembly (107) comprises one or more first bridge arm conversion circuits, and each first bridge arm conversion circuit comprises a first bridge arm and a first winding. For each first bridge arm conversion circuit, a first end of the first winding is connected to a midpoint of the first bridge arm, a second end of the first winding is connected to the second charging and discharging interface (109), a common end of the first bridge arm is connected to a positive electrode of the battery module (102) through the second switch (S2), and the common end of the first bridge arm is further connected to a negative electrode of the battery module (102) through the third switch (S3).

19. The charging and discharging circuit (100) according to claim 3, 4, 17 or 18, characterized in that, The controller (101) is configured to determine at least one first target bridge arm conversion circuit from the one or more first bridge arm conversion circuits according to the second charge-discharge request, and form a charge path or a discharge path between the battery module (102) and the second target device (1010) through the first target bridge arm conversion circuit.

20. The charge-discharge circuit (100) of claim 3, 4, 17, 18 or 19, wherein, The controller (101) is configured to control the target switch (103), the second switch (S2) and the third switch (S3) to be open, and the lower bridge arm of the first bridge arm in the first target bridge arm conversion circuit to be conductive in a first specified time period of each seventh control period, to form a fourth path between the second target device (1010) and the first winding in the first target bridge arm conversion circuit, and the lower bridge arm of the first bridge arm in the first target bridge arm conversion circuit, so as to charge the first winding in the first target bridge arm conversion circuit by the second target device (1010) when the second charge-discharge request is a second boost charging request.

21. The charge-discharge circuit (100) of claim 3, 4, 17, 18, 19 or 20, wherein, The controller (101) is further configured to control the target switch (103) to be open, the second switch (S2) and the third switch (S3) to be closed, and the upper bridge arm of the first bridge arm in the first target bridge arm conversion circuit to be conductive, and the lower bridge arm of the first bridge arm in the first target bridge arm conversion circuit to be cut off in a second specified time period of each seventh control period, to form a second boost charging path between the second target device (1010) and the first winding in the first target bridge arm conversion circuit, the upper bridge arm of the first bridge arm in the first target bridge arm conversion circuit, the second switch (S2), the battery module (102), and the third switch (S3), so as to charge the battery module (102) by the second target device (1010) and the first winding in the first target bridge arm conversion circuit when the second charge-discharge request is a second boost charging request.

22. The charge-discharge circuit (100) of claim 3, 4, 17, 18 or 19, wherein, The controller (101) is configured to, in a case where the second charging and discharging request is a second step-down discharging request, control the target switch (103) to be open, the second switch (S2) and the third switch (S3) to be closed, and an upper bridge arm of a first bridge arm in the first target bridge arm conversion circuit to be conductive in a first specified time period of each eighth control period, so as to form a third step-down discharging path between the battery module (102), the second switch (S2), the upper bridge arm of the first bridge arm in the first target bridge arm conversion circuit, a first winding in the first target bridge arm conversion circuit, the second target device (1010), and the third switch (S3), so as to cause the battery module (102) to discharge the first winding in the first target bridge arm conversion circuit and the second target device (1010).

23. The charging and discharging circuit (100) according to claim 3, 4, 17, 18, 19 or 20, characterized in that, The controller (101) is further configured to, in a second specified time period of each eighth control period, control the target switch (103), the second switch (S2) and the third switch (S3) to be open, an upper bridge arm of the first bridge arm in the first target bridge arm conversion circuit to be cut off, and a lower bridge arm of the first bridge arm in the first target bridge arm conversion circuit to be conductive, so as to form a fourth step-down discharging path between the first winding in the first target bridge arm conversion circuit, the second target device (1010), and the lower bridge arm of the first bridge arm in the first target bridge arm conversion circuit, so as to cause the first winding in the first target bridge arm conversion circuit to discharge the second target device (1010).

24. The charge and discharge circuit (100) according to claim 3, 4 or 19, characterized in that, The charging and discharging circuit (100) further comprises a second motor control assembly (108) and a fourth switch (S4), one end of the second motor control assembly (108) is connected with the first motor control assembly (107) through the fourth switch (S4), and the other end is connected with the battery module (102), The controller (101) is further configured to control the second motor control assembly (108) to form a charging path or a discharging path with the battery module (102) and the second target device (1010) according to the second charging and discharging request.

25. The charging and discharging circuit (100) according to claim 3, 4, 19 or 24, characterized in that, The second motor control assembly (108) comprises one or more second bridge arm conversion circuits, and each second bridge arm conversion circuit comprises a second bridge arm and a second winding; For each second bridge arm conversion circuit, a first end of the second winding is connected with a midpoint of the second bridge arm, a second end of the second winding is connected with the second end of the first winding through the fourth switch (S4), and a confluence end of the second bridge arm is connected with the confluence end of the first bridge arm through the second switch (S2) and the third switch (S3).

26. The charging and discharging circuit (100) according to claim 3, 4, 19, 24 or 25, characterized in that, The controller (101) is configured to determine at least one second target bridge arm conversion circuit from the one or more second bridge arm conversion circuits according to the second charge-discharge request, and form a charge path or a discharge path between the second target device (1010) and the battery module (102) through the second target bridge arm conversion circuit.

27. The charge-discharge circuit (100) of claim 3, 4, 19, 24, 25, or 26, wherein, The controller (101) is configured to, in a case that the second charge-discharge request is a third step-up charge request, control the third switch (S3) and the fourth switch (S4) to be closed, the target switch (103) and the second switch (S2) to be open, and a lower bridge arm of a second bridge arm in the second target bridge arm conversion circuit to be conductive in a first specified time period of each ninth control period, so as to form a fifth path between the second target device (1010), the fourth switch (S4), a second winding in the second target bridge arm conversion circuit, the lower bridge arm of the second bridge arm in the second target bridge arm conversion circuit, and the third switch (S3), so as to enable the second target device (1010) to charge the second winding in the second target bridge arm conversion circuit.

28. The charge-discharge circuit (100) of claim 3, 4, 19, 24, 25, 26, or 27, wherein, The controller (101) is further configured to, in a second specified time period of each ninth control period, control the third switch (S3) and the fourth switch (S4) to be closed, the target switch (103) and the second switch (S2) to be open, and an upper bridge arm of the second bridge arm in the second target bridge arm conversion circuit to be conductive and a lower bridge arm of the second bridge arm in the second target bridge arm conversion circuit to be cut off, so as to form a third step-up charge path between the second target device (1010), the fourth switch (S4), the second winding in the second target bridge arm conversion circuit, the upper bridge arm of the second bridge arm in the second target bridge arm conversion circuit, the battery module (102), and the third switch (S3), so as to enable the second target device (1010) and the second winding in the second target bridge arm conversion circuit to charge the battery module (102).

29. The charge-discharge circuit (100) of claim 3, 4, 19, 24, 25, or 26, wherein, In a case where the second charge-discharge request is a third step-down discharge request, the controller (101) is configured to control the third switch (S3) and the fourth switch (S4) to be closed, the target switch (103) and the second switch (S2) to be opened, and an upper bridge arm of the second bridge arm in the second target bridge arm conversion circuit to be conducted in a first specified time period of every tenth control period, so as to form a fifth step-down discharge path between the battery module (102), the upper bridge arm of the second bridge arm in the second target bridge arm conversion circuit, the second winding in the second target bridge arm conversion circuit, the fourth switch (S4), the second target device (1010), and the third switch (S3), so as to discharge the second target device (1010) and the second winding in the second target bridge arm conversion circuit by the battery module (102).

30. The charge-discharge circuit (100) of claim 3, 4, 19, 24, 25, 26, or 29, wherein, In a case where the second charge-discharge request is a third step-down discharge request, the controller (101) is configured to control the third switch (S3) and the fourth switch (S4) to be closed, the target switch (103) and the second switch (S2) to be opened, and an upper bridge arm of the second bridge arm in the second target bridge arm conversion circuit to be conducted in a first specified time period of every tenth control period, so as to form a fifth step-down discharge path between the battery module (102), the upper bridge arm of the second bridge arm in the second target bridge arm conversion circuit, the second winding in the second target bridge arm conversion circuit, the fourth switch (S4), the second target device (1010), and the third switch (S3), so as to discharge the second target device (1010) and the second winding in the second target bridge arm conversion circuit by the battery module (102).

31. The charge-discharge circuit (100) of claim 3, 4, 19, or 24, wherein, In a case where the current temperature of the battery module (102) is less than or equal to a preset temperature threshold, the controller (101) is configured to control the first target bridge arm conversion circuit and / or the second target bridge arm conversion circuit to form a self-heating path with the battery module (102), so as to heat the battery module (102).

32. The charge-discharge circuit (100) of claim 3, 4, 19, 24, or 31, wherein, The controller (101) is configured to, according to a first self-heating request, determine a first standby bridge arm conversion circuit and a second standby bridge arm conversion circuit from the plurality of first bridge arm conversion circuits in a first specified time period of each first self-heating control period, and control the target switch (103) and the fourth switch (S4) to be open, the second switch (S2) and the third switch (S3) to be closed, the upper bridge arm of the first bridge arm in the first standby bridge arm conversion circuit to be conductive, and the lower bridge arm of the first bridge arm in the second standby bridge arm conversion circuit to be conductive, so as to form a first self-heating path between the battery module (102), the second switch (S2), the upper bridge arm of the first bridge arm in the first standby bridge arm conversion circuit, the first winding in the first standby bridge arm conversion circuit, the first winding in the second standby bridge arm conversion circuit, the lower bridge arm of the first bridge arm in the second standby bridge arm conversion circuit, and the third switch (S3), and heat the battery module (102).

33. The charging and discharging circuit (100) of claim 3, 4, 19, 24, 31 or 32, wherein, The controller (101) is further configured to, in a second specified time period of each first self-heating control period, control the target switch (103) and the fourth switch (S4) to be open, the second switch (S2) and the third switch (S3) to be closed, the upper bridge arm of the first bridge arm in the first standby bridge arm conversion circuit to be non-conductive, the lower bridge arm of the first bridge arm in the first standby bridge arm conversion circuit to be conductive, the upper bridge arm of the first bridge arm in the second standby bridge arm conversion circuit to be conductive, and the lower bridge arm of the first bridge arm in the second standby bridge arm conversion circuit to be non-conductive, so as to form a second self-heating path between the first winding in the first standby bridge arm conversion circuit, the first winding in the second standby bridge arm conversion circuit, the upper bridge arm of the first bridge arm in the second standby bridge arm conversion circuit, the second switch (S2), the battery module (102), the third switch (S3), and the lower bridge arm of the first bridge arm in the first standby bridge arm conversion circuit, and heat the battery module (102).

34. The charging and discharging circuit (100) of claim 3, 4, 19, 24 or 31, wherein, The controller (101) is configured to, according to a second self-heating request, determine a first preset bridge arm conversion circuit and a second preset bridge arm conversion circuit from the plurality of second bridge arm conversion circuits within a first specified time period of each second self-heating control period, and control the target switch (103), the second switch (S2), the third switch (S3), and the fourth switch (S4) to be turned off, the upper bridge arm of the second bridge arm in the first preset bridge arm conversion circuit to be turned on, and the lower bridge arm of the second bridge arm in the second preset bridge arm conversion circuit to be turned on, so as to form a third self-heating path between the battery module (102), the upper bridge arm of the second bridge arm in the first preset bridge arm conversion circuit, the second winding in the first preset bridge arm conversion circuit, the second winding in the second preset bridge arm conversion circuit, and the lower bridge arm of the second bridge arm in the second preset bridge arm conversion circuit, and heat the battery module (102).

35. The charging and discharging circuit (100) of claim 3, 4, 19, 24, 31 or 34, wherein, The controller (101) is further configured to, within a second specified time period of each second self-heating control period, control the target switch (103), the second switch (S2), the third switch (S3), and the fourth switch (S4) to be turned off, the upper bridge arm of the second bridge arm in the first preset bridge arm conversion circuit to be turned off, the lower bridge arm of the second bridge arm in the first preset bridge arm conversion circuit to be turned on, the upper bridge arm of the second bridge arm in the second preset bridge arm conversion circuit to be turned on, and the lower bridge arm of the second bridge arm in the second preset bridge arm conversion circuit to be turned off, so as to form a fourth self-heating path between the second winding in the first preset bridge arm conversion circuit, the second winding in the second preset bridge arm conversion circuit, the upper bridge arm of the second bridge arm in the second preset bridge arm conversion circuit, the battery module (102), and the lower bridge arm of the second bridge arm in the first preset bridge arm conversion circuit, and heat the battery module (102).

36. The charging and discharging circuit (100) of claim 3, 4, 19, 24 or 31, wherein, The controller (101) is configured to control, according to a third self-heating request, the target switch (103) and the second switch (S2) to be open, the third switch (S3) and the fourth switch (S4) to be closed, the lower bridge arm of the first bridge arm in the first target bridge arm conversion circuit to be conductive, and the upper bridge arm of the second bridge arm in the second target bridge arm conversion circuit to be conductive, so as to form a fifth self-heating path between the battery module (102), the upper bridge arm of the second bridge arm in the second target bridge arm conversion circuit, the second winding in the second target bridge arm conversion circuit, the fourth switch (S4), the first winding in the first target bridge arm conversion circuit, the lower bridge arm of the first bridge arm in the first target bridge arm conversion circuit, and the third switch (S3) in a first specified time period of each third self-heating control period, so as to heat the battery module (102).

37. The charging and discharging circuit (100) of claim 3, 4, 19, 24, 31 or 36, wherein, The controller (101) is further configured to control, in a second specified time period of each third self-heating control period, the target switch (103) and the third switch (S3) to be open, the second switch (S2) and the fourth switch (S4) to be closed, the upper bridge arm of the first bridge arm in the first target bridge arm conversion circuit to be conductive, the lower bridge arm of the first bridge arm in the first target bridge arm conversion circuit to be non-conductive, the upper bridge arm of the second bridge arm in the second target bridge arm conversion circuit to be non-conductive, and the lower bridge arm of the second bridge arm in the second target bridge arm conversion circuit to be conductive, so as to form a sixth self-heating path between the first winding in the first target bridge arm conversion circuit, the upper bridge arm of the first bridge arm in the first target bridge arm conversion circuit, the second switch (S2), the battery module (102), the lower bridge arm of the second bridge arm in the second target bridge arm conversion circuit, the second winding in the second target bridge arm conversion circuit, and the fourth switch (S4), so as to heat the battery module (102).

38. The charging and discharging circuit (100) of claim 3, 4, 19, 24 or 31, wherein, The controller (101) is configured to control, according to a fourth self-heating request, the target switch (103) and the third switch (S3) to be open, the second switch (S2) and the fourth switch (S4) to be closed, the upper bridge arm of the first bridge arm in the first target bridge arm conversion circuit to be conductive, and the lower bridge arm of the second bridge arm in the second target bridge arm conversion circuit to be conductive, so as to form a seventh self-heating path between the battery module (102), the second switch (S2), the upper bridge arm of the first bridge arm in the first target bridge arm conversion circuit, the first winding in the first target bridge arm conversion circuit, the second winding in the second target bridge arm conversion circuit, the fourth switch (S4), and the lower bridge arm of the second bridge arm in the second target bridge arm conversion circuit, and heat the battery module (102) in a first specified time period of each fourth self-heating control period.

39. The charging and discharging circuit (100) of claim 3, 4, 19, 24, 31 or 38, further comprising: The controller (101) is further configured to control, in a second specified time period of each fourth self-heating control period, the target switch (103) and the second switch (S2) to be open, the third switch (S3) and the fourth switch (S4) to be closed, the upper bridge arm of the first bridge arm in the first target bridge arm conversion circuit to be non-conductive, the lower bridge arm of the first bridge arm in the first target bridge arm conversion circuit to be conductive, the upper bridge arm of the second bridge arm in the second target bridge arm conversion circuit to be conductive, and the lower bridge arm of the second bridge arm in the second target bridge arm conversion circuit to be non-conductive, so as to form an eighth self-heating path between the first winding in the first target bridge arm conversion circuit, the fourth switch (S4), the second winding in the second target bridge arm conversion circuit, the upper bridge arm of the second bridge arm in the second target bridge arm conversion circuit, the battery module (102), the third switch (S3), and the lower bridge arm of the first bridge arm in the first target bridge arm conversion circuit, and heat the battery module (102).

40. A vehicle (3200) characterized by, The vehicle (3200) comprises the charging and discharging circuit (100) according to any one of claims 1-39.

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