Charging and discharging circuit, charging and discharging system and vehicle

Abstract

The invention discloses a charging and discharging circuit, a charging and discharging system and a vehicle, relates to the technical field of electric vehicles, and aims to prolong the service life of a switch module in the charging and discharging circuit. The charging and discharging circuit comprises a first branch circuit, a second branch circuit and a shunting branch circuit. The first branch circuit is electrically connected with the first pole of the battery and the first pole of the charging and discharging port, and the first branch circuit is electrically connected with a first switch module. The second branch circuit is electrically connected with the second pole of the battery and the second pole of the charging and discharging port. And the shunting branch comprises a voltage conversion module and a second switch module connected in series with the voltage conversion module, and the shunting branch is connected between the charging and discharging port and the battery. When the battery is charged in a first charging mode or the battery is discharged outwards in a first discharging mode, the first switch module and the second switch module are configured to be closed, so that a part of current flows through the first branch circuit, and the other part of current flows through the shunting branch circuit.

Description

Technical Field

[0001] The present invention relates to the technical field of electric vehicles, and in particular to a charging and discharging circuit, a charging and discharging system, and a vehicle. Background Art

[0002] With the development of automobiles, the automobile industry has entered a new stage of large-scale development. In the charging circuit of a vehicle, the on-off between the vehicle battery and the charging and discharging ports is controlled by a switch device. During the charging process of the vehicle, excessive charging current will damage the switch element. Summary of the invention

[0003] The object of the present invention is to provide a charging and discharging circuit, a charging and discharging system, and a vehicle, aiming to extend the life of a switch module in the charging and discharging circuit.

[0004] In order to achieve the above object, the present invention adopts the following technical scheme:

[0005] The present invention provides a charge and discharge circuit. The charge and discharge circuit comprises: a first branch, a second branch and a shunt branch. The first branch is electrically connected to a first pole of a battery and a first pole of a charge and discharge port, and a first switch module is electrically connected to the first branch. The second branch is electrically connected to a second pole of the battery and a second pole of the charge and discharge port.

[0006] The shunt branch includes: a voltage conversion module and a second switch module connected in series with the voltage conversion module. The shunt branch is connected between the charge and discharge port and the battery.

[0007] When charging the battery in the first charging mode or discharging the battery in the first discharging mode, the first switch module and the second switch module are configured to be closed so that a portion of the current flows through the first branch and another portion of the current flows through the shunt branch. The first charging mode includes a charging mode that does not use the voltage conversion module for voltage conversion, and the first discharging mode is a discharging mode that does not use the voltage conversion module for voltage conversion.

[0008] The charging and discharging circuit provided in the embodiment of the present application simultaneously forms a shunt branch and a first branch between the first pole of the battery and the first pole of the charging and discharging port during the process of charging the battery or discharging the battery. Compared with the solution of forming the first branch only between the first pole of the battery and the first pole of the charging and discharging port, the current flowing through the first branch during the charging or discharging process of the battery can be significantly reduced, so that the current on the first branch and the shunt branch is smaller than the charging current provided by the charging and discharging port or the discharging current provided by the battery, thereby protecting the first switch module on the first branch from being damaged by the large current, and the second switch module on the shunt branch from being damaged by the large current, thereby improving the life of the switch module in the charging and discharging circuit.

[0009] In some embodiments, the voltage conversion module includes: an inverter and a motor; the two poles of the inverter are electrically connected to the first pole of the battery and the second pole of the battery respectively, the first end of the motor is electrically connected to the inverter, the second end of the motor is electrically connected to the first pole of the charging and discharging port or the first pole of the battery, and the second switch module is connected in series with the inverter and the motor.

[0010] In some embodiments, the first pole of the inverter is electrically connected to the first pole of the battery, the second pole of the inverter is electrically connected to the second pole of the battery, and the third pole of the inverter is electrically connected to the first end of the motor; the second end of the motor is electrically connected to the first pole of the charging and discharging port.

[0011] In some embodiments, when an external power source is connected to the charging and discharging port to charge the battery, the inverter is configured to conduct the third pole to the first pole of the inverter, so that another part of the current flows from the first pole of the charging and discharging port, through the motor, the inverter, and then to the first pole of the battery.

[0012] In some embodiments, when the battery is discharging, the inverter is configured to conduct from the first pole to the third pole of the inverter, so that another part of the current flows from the first pole of the battery, through the inverter and the motor in sequence, to the first pole of the charging and discharging port.

[0013] In some embodiments, when an external power source is connected to the charge and discharge port to charge the battery, the inverter is configured to conduct the first pole to the third pole of the inverter so that another part of the current flows from the first pole of the battery, through the inverter, the motor, the second switch module, in sequence, to the first pole of the charge and discharge port.

[0014] In some embodiments, when the battery is discharging, the inverter is configured to conduct from the third pole to the first pole of the inverter, so that another part of the current flows from the first pole of the charging and discharging port, through the motor and the inverter in sequence, to the first pole of the battery.

[0015] In some embodiments, the first switch module is electrically connected between the first pole of the inverter and the first pole of the charge and discharge port; the second end of the motor is electrically connected to the first pole of the charge and discharge port through the second switch module.

[0016] In some embodiments, the first pole of the inverter is electrically connected to the first pole of the battery, the second pole of the inverter is electrically connected to the second pole of the battery, the third pole of the inverter is electrically connected to the first end of the motor; the second end of the motor is electrically connected to the first pole of the battery.

[0017] In some embodiments, when an external power source is connected to the charging and discharging port to charge the battery, the inverter is configured to conduct the first pole to the third pole of the inverter so that another part of the current flows from the first pole of the charging and discharging port, through the inverter and the motor in sequence, to the first pole of the battery.

[0018] In some embodiments, when the battery is discharging, the inverter is configured to conduct from the third pole to the first pole of the inverter, so that another part of the current flows from the first pole of the charging and discharging port, through the motor and the inverter in sequence, to the first pole of the charging and discharging port.

[0019] In some embodiments, when an external power source is connected to the charge and discharge port to charge the battery, the inverter is configured to conduct the third pole to the first pole of the inverter so that another part of the current flows from the first pole of the battery, through the motor, the inverter, and then to the first pole of the charge and discharge port.

[0020] In some embodiments, when discharging the battery, the inverter is configured to conduct from the first pole to the third pole of the inverter so that another part of the current flows from the first pole of the charge and discharge port, through the inverter and the motor in sequence, to the first pole of the battery.

[0021] In some embodiments, the first switch module is electrically connected between the first pole of the inverter and the first pole of the battery; the second end of the motor is electrically connected to the first pole of the battery through the second switch module.

[0022] In some embodiments, the charge and discharge circuit further includes: a first capacitor; a first end of the first capacitor is electrically connected to a first pole of the battery, and a second end of the first capacitor is electrically connected to a second pole of the battery.

[0023] In some embodiments, the charge and discharge circuit further includes: a third switch module, and / or a fourth switch module. The third switch module is electrically connected between the first end of the first capacitor and the first pole of the battery. The fourth switch module is electrically connected between the second end of the first capacitor and the second pole of the battery.

[0024] In some embodiments, when the second end of the motor is electrically connected to the first pole of the charging and discharging port, the third switch module is electrically connected between the first switch module and the first pole of the battery; or, the third switch module is electrically connected between the first pole of the inverter and the first pole of the battery.

[0025] In some embodiments, the charge and discharge circuit further includes: a second capacitor; a first end of the second capacitor is electrically connected to a first pole of the charge and discharge port, and a second end of the second capacitor is electrically connected to a second pole of the charge and discharge port.

[0026] In some embodiments, the charge and discharge circuit further includes: a fifth switch module, and / or a sixth switch module. The fifth switch module is electrically connected between the first end of the second capacitor and the first pole of the charge and discharge port. The sixth switch module is electrically connected between the second end of the second capacitor and the second pole of the charge and discharge port.

[0027] In some embodiments, the first branch includes a first connecting line, the shunt branch includes a second connecting line, and the impedance of the first connecting line is greater than the impedance of the second connecting line.

[0028] In some embodiments, the material of the first connecting wire includes aluminum-magnesium alloy or aluminum alloy, and the material of the second connecting wire includes copper.

[0029] In some embodiments, the motor includes: a winding coil, a first end of the winding coil is electrically connected to a first end of the motor, and a second end of the winding coil is electrically connected to a second end of the motor. In the case of heating the battery, the charge and discharge circuit includes switching between a first stage and a second stage.

[0030] In the first stage, the charging and discharging port, the inverter and the winding coil form a loop, or the battery, the inverter and the winding coil form a loop. In the second stage, the charged winding coil and the inverter form a loop.

[0031] In some embodiments, in the first stage, the inverter is configured to conduct from the third pole to the second pole of the inverter; the second switch module is configured to be closed so that the current flows from the first pole of the charging and discharging port, through the second switch module, the winding coil, the inverter, to the second pole of the charging and discharging port, forming a loop.

[0032] Alternatively, in the first stage, the inverter is configured to conduct from the third pole to the second pole of the inverter; the first switch module and the second switch module are configured to be closed so that the current flows from the first pole of the battery, through the first switch module, the second switch module, the winding coil, the inverter, to the second pole of the battery, forming a loop.

[0033] In some embodiments, in the second stage, the inverter is configured to conduct from the third pole to the first pole of the inverter, and the first switch module and the second switch module are configured to be closed so that the current flows from the first end of the winding coil through the inverter, the first switch module, the second switch module, to the second end of the winding coil to form a loop.

[0034] In some embodiments, the motor includes: a winding coil, a first end of the winding coil is electrically connected to a first end of the motor, and a second end of the winding coil is electrically connected to a second end of the motor. In the case of heating the battery, the charge and discharge circuit includes switching between a first stage and a second stage.

[0035] In the first stage, the voltage provided by the charging and discharging port or the voltage output by the battery charges the winding coil via the inverter. In the second stage, the charged winding coil is discharged via the inverter.

[0036] In some embodiments, in the first stage, the inverter is configured to conduct from the second pole to the third pole of the inverter; the second switch module is configured to be closed so that the current flows from the second pole of the charging and discharging port, through the inverter, the winding coil, the second switch module, to the first pole of the charging and discharging port in sequence, forming a loop.

[0037] Alternatively, in the first stage, the inverter is configured to conduct from the second pole to the third pole of the inverter; the first switch module and the second switch module are configured to be closed so that the current flows from the second pole of the battery, through the inverter, the winding coil, the second switch module, the first switch module, to the first pole of the battery, forming a loop.

[0038] In some embodiments, in the second stage, the inverter is configured to conduct from the first pole to the third pole of the inverter, and the first switch module and the second switch module are configured to be closed so that the current flows from the second end of the winding coil, through the second switch module, the first switch module, the inverter, to the first end of the winding coil, forming a loop.

[0039] In some embodiments, the motor includes: a winding coil, a first end of the winding coil is electrically connected to a first end of the motor, and a second end of the winding coil is electrically connected to a second end of the motor. In the case of heating the battery, the charge and discharge circuit includes switching between a first stage and a second stage.

[0040] In the first stage, the voltage provided by the charging and discharging port or the voltage output by the battery charges the winding coil via the inverter. In the second stage, the charged winding coil is discharged via the inverter.

[0041] In some embodiments, in the first stage, the inverter is configured to conduct from the third pole to the second pole of the inverter; the first switch module and the second switch module are configured to be closed so that the current flows from the first pole of the charging and discharging port, through the first switch module, the second switch module, the winding coil, the inverter, to the second pole of the charging and discharging port, to form a loop.

[0042] Alternatively, in the first stage, the inverter is configured to conduct from the third pole to the second pole of the inverter; the second switch module is configured to be closed so that the current flows from the first pole of the battery, through the second switch module, the winding coil, the inverter, to the second pole of the battery, forming a loop.

[0043] In some embodiments, in the second stage, the inverter is configured to conduct from the third pole to the first pole of the inverter, and the first switch module and the second switch module are configured to be closed so that the current flows from the first end of the winding coil through the inverter, the first switch module, the second switch module, in sequence, to the second end of the winding coil to form a loop.

[0044] In some embodiments, the motor includes: a winding coil, a first end of the winding coil is electrically connected to a first end of the motor, and a second end of the winding coil is electrically connected to a second end of the motor; when the battery is heated, the charge and discharge circuit includes switching between a first stage and a second stage.

[0045] In the first stage, the charging and discharging port, the inverter and the winding coil form a loop, or the battery, the inverter and the winding coil form a loop. In the second stage, the charged winding coil and the inverter form a loop.

[0046] In some embodiments, in the first stage, the inverter is configured to conduct from the second pole to the third pole of the inverter; the first switch module and the second switch module are configured to be closed so that the current flows from the second pole of the charging and discharging port, through the inverter, the winding coil, the second switch module, the first switch module, to the first pole of the charging and discharging port, to form a loop.

[0047] Alternatively, in the first stage, the inverter is configured to conduct from the second pole to the third pole of the inverter; the second switch module is configured to be closed so that the current flows from the second pole of the battery, through the inverter, the winding coil, the second switch module, to the first pole of the battery, forming a loop.

[0048] In some embodiments, in the second stage, the inverter is configured to conduct from the first pole to the third pole of the inverter, and the first switch module and the second switch module are configured to be closed so that the current flows from the second end of the winding coil, through the second switch module, the first switch module, the inverter, to the first end of the winding coil, forming a loop.

[0049] In some embodiments, the inverter includes: multi-phase bridge arms connected in parallel, each phase bridge arm is electrically connected between a first pole and a second pole of the inverter. Each phase bridge arm includes a first switch element and a second switch element, the first pole of the first switch element is electrically connected to the first pole of the inverter circuit, the second pole of the first switch element is electrically connected to the first pole of the second switch element, and the second pole of the second switch element is electrically connected to the second pole of the inverter circuit; the common terminal of a first switch element and a second switch element serves as a third pole of the inverter.

[0050] In some embodiments, the motor includes: a winding coil, a first end of the winding coil is electrically connected to a first end of the motor, a second end of the winding coil is electrically connected to a second end of the motor, and one end of a group of winding coils of the motor is electrically connected to a third pole of the inverter.

[0051] In some embodiments, a first switch element includes a first transistor and a first diode, and a second switch element includes a second transistor and a second diode. The first transistor and the first diode are connected in parallel between the first pole of the inverter and a third pole of the inverter, and the second transistor and the second diode are connected in parallel between the second pole of the inverter and a third pole of the inverter.

[0052] In some embodiments, when the first to third poles of the inverter are turned on, the first transistor is configured to be turned on and the first diode is turned off.

[0053] When the third pole to the first pole of the inverter is turned on, the first transistor is configured to be turned off and the first diode is turned on.

[0054] When the second to third electrodes of the inverter are turned on, the second transistor is configured to be turned off and the first diode is turned on.

[0055] When the third pole to the second pole of the inverter is turned on, the first transistor is configured to be turned on and the first diode is turned off.

[0056] The present invention also provides a charging and discharging system. The charging and discharging system includes: a controller and a charging and discharging circuit as provided in any of the above embodiments. The controller is electrically connected to an inverter, a first switch module, and a second switch module of the charging and discharging circuit, respectively. The controller is configured to control the first switch module to form a first branch; and control the second switch module and the inverter to form a shunt branch.

[0057] The charging and discharging system has the structure and beneficial effects of the charging and discharging circuit described in any of the above embodiments, which will not be described in detail here.

[0058] The present invention also provides a vehicle, comprising a charging and discharging system as provided in any of the above embodiments.

[0059] The vehicle has the structure and beneficial effects of the charging and discharging circuit as described in any of the above embodiments, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0061] Figure 1 is a topological diagram of a charge and discharge circuit according to some embodiments;

[0062] Figure 2 Based on Figure 1 The current flow diagram of the charging and discharging circuit shown in the figure when the battery is in the charging state;

[0063] Figure 3 Based on Figure 1 The current flow diagram of the charging and discharging circuit shown in the figure when the battery is in the discharging state;

[0064] Figure 4 is a topological diagram of a charge and discharge circuit according to some other embodiments;

[0065] Figure 5 Based on Figure 4The current flow diagram of the charging and discharging circuit shown in the figure when the battery is in the charging state;

[0066] Figure 6 Based on Figure 4 The current flow diagram of the charging and discharging circuit shown in the figure when the battery is in the discharging state;

[0067] Figure 7 is a topological diagram of a charge and discharge circuit according to some other embodiments;

[0068] Figure 8 is a topological diagram of a charge and discharge circuit according to some other embodiments;

[0069] Fig. 9 is a topological diagram of a charge and discharge circuit according to some other embodiments;

[0070] Fig.10 according to Fig. 9 The current flow diagram of the charging and discharging circuit shown in the figure when the battery is in the charging state;

[0071] Fig.11 according to Fig. 9 The current flow diagram of the charging and discharging circuit shown in the figure when the battery is in the discharging state;

[0072] Fig.12 is a topological diagram of a charge and discharge circuit according to some other embodiments;

[0073] Fig.13 according to Fig.12 The current flow diagram of the charging and discharging circuit shown in the figure when the battery is in the charging state;

[0074] Fig.14 according to Fig.12 The current flow diagram of the charging and discharging circuit shown in the figure when the battery is in the discharging state;

[0075] Fig.15 is a topological diagram of a charge and discharge circuit according to some other embodiments;

[0076] Fig.16 according to Fig.15 The current flow diagram of the charging and discharging circuit shown in the figure when the battery is in the charging state;

[0077] Fig.17 according to Fig.15 The current flow diagram of the charging and discharging circuit shown in the figure when the battery is in the discharging state;

[0078] Fig.18 is a topological diagram of a charge and discharge circuit according to some other embodiments;

[0079] Fig.19 according to Fig.18 The current flow diagram of the charging and discharging circuit shown in the figure when the battery is in the charging state;

[0080] Fig. 20 according to Fig.18 The current flow diagram of the charging and discharging circuit shown in the figure when the battery is in the discharging state;

[0081] Fig.21 is a topological diagram of a charge and discharge circuit according to some other embodiments;

[0082] Fig. 22 is a topological diagram of a charge and discharge circuit according to some other embodiments;

[0083] Fig.23 Based on Figure 1 A current flow diagram of the charging and discharging circuit shown in the first stage of heating the battery;

[0084] Fig.24 Based on Figure 1 Another current flow diagram of the charging and discharging circuit shown in the first stage of heating the battery;

[0085] Fig.25 Based on Figure 1 The current flow diagram of the charging and discharging circuit shown in the second stage of heating the battery;

[0086] Fig.26 Based on Figure 4 A current flow diagram of the charging and discharging circuit shown in the first stage of heating the battery;

[0087] Fig. 27 Based on Figure 4 Another current flow diagram of the charging and discharging circuit shown in the first stage of heating the battery;

[0088] Fig.28 Based on Figure 4 The current flow diagram of the charging and discharging circuit shown in the second stage of heating the battery;

[0089] Fig.29 Based on Fig.15 A current flow diagram of the charging and discharging circuit shown in the first stage of heating the battery;

[0090] Fig.30 Based on Fig.15 Another current flow diagram of the charging and discharging circuit shown in the first stage of heating the battery;

[0091] Fig.31 Based on Fig.15 The current flow diagram of the charging and discharging circuit shown in the second stage of heating the battery;

[0092] Fig.32 Based on Fig.18A current flow diagram of the charging and discharging circuit shown in the first stage of heating the battery;

[0093] Fig.33 Based on Fig.18 Another current flow diagram of the charging and discharging circuit shown in the first stage of heating the battery;

[0094] Fig.34 Based on Fig.18 The current flow diagram of the charging and discharging circuit shown in the second stage of battery heating.

[0095] Reference numerals:

[0096] K1, the first switch module; K2, the second switch module; K3, the third switch module; K4, the fourth switch module; K5, the fifth switch module; K6, the sixth switch module;

[0097] VT1, VT3, VT4, first transistor; VT2, VT4, VT6, second transistor;

[0098] VD1, VD3, VD4, the first diode; VD2, VD4, VD6, the second diode;

[0099] C1, first capacitor; C2, second capacitor. DETAILED DESCRIPTION

[0100] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0101] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "front", "back", "inside", "outside" and the like indicate directions or positional relationships based on the directions or relative positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention. Unless otherwise specified, the above-mentioned directional description can be flexibly set in the process of actual application under the condition that the relative positional relationship shown in the accompanying drawings is satisfied.

[0102] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0103] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "electrically connected", and "connected" should be understood in a broad sense. For example, it can be a fixed electrical connection, a detachable electrical connection, or an integral electrical connection. It can be directly connected, or indirectly connected through an intermediate medium, or it can be internal communication between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0104] In the embodiments of the present invention, the terms "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, article or device including the element.

[0105] In the embodiments of the present invention, words such as "exemplary" or "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present invention should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0106] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0107] Some embodiments of the present application provide a vehicle, which includes a charging and discharging system.

[0108] Exemplarily, the vehicle includes a battery, and one side of the charging and discharging system is electrically connected to the positive and negative electrodes of the battery. The battery is used to supply power to loads configured in the vehicle, including but not limited to electrical devices such as motors, electronic control systems, and lighting fixtures.

[0109] When the battery is charged or discharged, the other side of the charging and discharging system is electrically connected to the charging and discharging port, which can be connected to an external power source or an external energy storage device, such as a charging pile or an energy storage power source (such as a mobile charging vehicle, an energy storage device, and batteries in other vehicles, etc.).

[0110] The means of transportation described in the present application include but are not limited to vehicles, airplanes, or ships, etc. The following uses vehicles as an example to illustrate some embodiments of the present application.

[0111] In some embodiments, the charging and discharging system includes a charging and discharging circuit. The charging and discharging circuit includes: a first branch and a second branch. The first branch is electrically connected between the first pole of the battery and the first pole of the charging and discharging port, and the first branch is electrically connected to the first switch module K1. The second branch is electrically connected between the second pole of the battery and the second pole of the charging and discharging port.

[0112] Exemplarily, the first switch module K1 includes but is not limited to a relay, a contactor, and the like.

[0113] See also Figure 1 When charging or discharging the battery, the first switch module K1 is configured to be closed so that the current flows through the first branch and the second branch, so that the battery and the charging and discharging port form a loop.

[0114] In this case, during the process of charging or discharging the battery, only a first branch is formed between the first pole of the battery and the first pole of the charge and discharge port. Taking the charging of the battery by the charge and discharge port as an example, when the charging current provided by the charge and discharge port is large, the large current will damage the first switch module K1.

[0115] Based on this, the present application provides a charging and discharging circuit and a charging and discharging system.

[0116] In some embodiments, the charge and discharge system includes: a charge and discharge circuit and a controller.

[0117] For example, Figure 1 and Figure 4 As shown, the charge and discharge circuit includes: a first branch, a second branch and a shunt branch. The first branch is electrically connected to the first pole of the battery and the first pole of the charge and discharge port, and the first branch is electrically connected to the first switch module K1. The second branch is electrically connected to the second pole of the battery and the second pole of the charge and discharge port.

[0118] The shunt branch includes: a voltage conversion module and a second switch module K2 connected in series with the voltage conversion module. The shunt branch is connected between the charge and discharge port and the battery.

[0119] When charging the battery in the first charging mode or discharging the battery in the first discharging mode, the first switch module K1 and the second switch module K2 are configured to be closed so that a part of the current flows through the first branch and another part of the current flows through the shunt branch. The first charging mode includes a charging mode that does not use the voltage conversion module for voltage conversion, and the first discharging mode is a discharging mode that does not use the voltage conversion module for voltage conversion.

[0120] Exemplarily, the voltage conversion module includes an inverter and a motor; the two poles of the inverter are electrically connected to the first pole of the battery and the second pole of the battery respectively, the first end of the motor is electrically connected to the inverter, the second end of the motor is electrically connected to the first pole of the charging and discharging port or the first pole of the battery, and the second switch module is connected in series with the inverter and the motor.

[0121] Exemplarily, the second switch module K2 includes but is not limited to a relay, a contactor, and the like.

[0122] Exemplarily, in the charging and discharging system, the controller is electrically connected to the inverter, the first switch module K1 and the second switch module K2 of the charging and discharging circuit respectively. The controller is configured to control the first switch module K1 to form a first branch; and control the second switch module K2 and the inverter to form a shunt branch.

[0123] The charging and discharging circuit provided in the embodiment of the present application simultaneously forms a shunt branch and a first branch between the first pole of the battery and the first pole of the charging and discharging port during the process of charging the battery or discharging the battery. Compared with the solution of forming the first branch only between the first pole of the battery and the first pole of the charging and discharging port, the shunt flowing through the first branch during the charging or discharging of the battery can be significantly reduced, so that the current on the first branch and the shunt branch is smaller than the charging current provided by the charging and discharging port, or the discharging current provided by the battery, thereby protecting the first switch module K1 on the first branch from being damaged by large current, and the second switch module K2 on the shunt branch from being damaged by large current, thereby improving the life of the switch modules in the charging and discharging circuit.

[0124] In addition, the current on the first branch and the shunt branch is smaller, and the heat and energy consumption during the battery charging or discharging process is also smaller, thereby improving the power conversion efficiency.

[0125] In some embodiments, Figure 1 As shown, the first pole of the inverter is electrically connected to the first pole of the battery, the second pole of the inverter is electrically connected to the second pole of the battery, and the third pole of the inverter is electrically connected to the first end of the motor; the second end of the motor is electrically connected to the first pole of the charging and discharging port.

[0126] For example, Figure 1As shown, the first switch module K1 is electrically connected between the first pole of the inverter and the first pole of the charge and discharge port; the second end of the motor is electrically connected to the first pole of the charge and discharge port through the second switch module K2.

[0127] The motor in the embodiment of the present application can be led out by a neutral line or a phase line. Figure 1 The motor shown is a three-phase four-wire system, and the motor is connected to the second switch module K2 via a neutral line N line.

[0128] Or, the motor is phase-wired and the motor is three-phase three-wire system. Figure 1 K2 in is connected to any one of L1-L3.

[0129] In some embodiments, Figure 1 As shown, when the first pole of the battery is the positive pole and the second pole of the battery is the negative pole, correspondingly, the first pole of the charge and discharge port is the positive pole and the second pole of the charge and discharge port is the negative pole.

[0130] like Figure 2 As shown, when an external power source is connected to the charge and discharge port to charge the battery, the inverter is configured to conduct from the third pole to the first pole of the inverter, so that another part of the current flows from the first pole of the charge and discharge port, through the motor, the inverter, to the first pole of the battery.

[0131] like Figure 3 As shown, when the battery is discharging, the inverter is configured to conduct from the first pole to the third pole of the inverter, so that another part of the current flows from the first pole of the battery, through the inverter and the motor in sequence, to the first pole of the charge and discharge port.

[0132] When the first switch module K1 is used for a long time, the contacts are worn and oxidized, resulting in a larger contact impedance, which increases the heat generated by the first switch module K1 during battery charging or discharging.

[0133] like Figure 2 and Figure 3 As shown, when the battery is charged or discharged, part of the current between the first pole of the battery and the first pole of the charge and discharge port flows through the first switch module K1 on the first branch, and the other part of the current flows through the second switch module K2 on the shunt branch.

[0134] Compared with the solution of only forming the first branch, the shunt branch can share the current between the first pole of the battery and the first pole of the charging and discharging port together with the first branch, reduce the current of the first switch module K1 flowing through the first branch during the battery charging or discharging process, reduce the heat generation of the first switch module K1, and extend the service life of the first switch module K1.

[0135] By allocating the current through the shunt branch, even if the first switch module K1 has a certain amount of wear, the service life of the first switch module K1 can be extended.

[0136] In other embodiments, Figure 4 As shown, when the first pole of the battery is the negative pole and the second pole of the battery is the positive pole, correspondingly, the first pole of the charge and discharge port is the negative pole and the second pole of the charge and discharge port is the positive pole.

[0137] like Figure 5 As shown, when the external power supply is connected to the charge and discharge port to charge the battery, the inverter is configured to conduct the first pole to the third pole of the inverter, so that another part of the current flows from the first pole of the battery, through the inverter, the motor, the second switch module K2, to the first pole of the charge and discharge port.

[0138] like Figure 6 As shown, when the battery is discharging, the inverter is configured to conduct from the third pole to the first pole of the inverter, so that another part of the current flows from the first pole of the charge and discharge port, through the motor, the inverter, to the first pole of the battery.

[0139] like Figure 5 and Figure 6 As shown, when the battery is charged or the battery is discharged to the outside, in the current between the first pole of the battery and the first pole of the charge and discharge port, a part of the current flows through the first switch module K1 on the first branch, and the other part of the current flows through the second switch module K2 on the shunt branch. Compared with the solution of forming only the first branch, the shunt branch can share the current between the first pole of the battery and the first pole of the charge and discharge port together with the first branch, reduce the current flowing through the first switch module K1 on the first branch during the charging or discharging process of the battery, reduce the heat generation of the first switch module K1, and extend the service life of the first switch module K1.

[0140] When the first switch module K1 is used for a long time, the contacts are worn, oxidized, and the contact impedance increases. When the battery is charged or discharged, the heat increases. By sharing the current through the shunt branch, the service life of the first switch module K1 can be extended even if there is a certain amount of wear on the first switch module K1.

[0141] Based on the above embodiments, in some embodiments, such as Figure 7 As shown, the charge and discharge circuit further includes a first capacitor C1, a first end of the first capacitor C1 is electrically connected to a first pole of the battery, and a second end of the first capacitor C1 is electrically connected to a second pole of the battery.

[0142] For example, Figure 7 , Figure 8 and Fig. 9 As shown, the charge and discharge circuit further includes a third switch module K3 and / or a fourth switch module K4.

[0143] The third switch module K3 is electrically connected between the first end of the first capacitor C1 and the first electrode of the battery; the third switch module K3 is configured to be closed when the battery is charged or the battery is discharged.

[0144] The fourth switch module K4 is electrically connected between the second end of the first capacitor C1 and the second electrode of the battery; the fourth switch module K4 is configured to be closed when the battery is charged or the battery is discharged.

[0145] By controlling the on and off of the third switch module K3 and / or the fourth switch module K4, the on and off between the battery and the first capacitor C1, and the on and off between the battery and the charge and discharge port can be controlled.

[0146] In some embodiments, Figure 7 As shown, the charge and discharge circuit further includes a second capacitor C2, a first end of the second capacitor C2 is electrically connected to a first pole of the charge and discharge port, and a second end of the second capacitor C2 is electrically connected to a second pole of the charge and discharge port.

[0147] For example, Figure 7 , Figure 8 and Fig. 9 As shown, the charge and discharge circuit further includes a fifth switch module K5 and / or a sixth switch module K6.

[0148] The fifth switch module K5 is electrically connected between the first end of the second capacitor C2 and the first electrode of the charge and discharge port; the fifth switch module K5 is configured to be closed when the battery is charged or the battery is discharged.

[0149] The sixth switch module K6 is electrically connected between the second end of the second capacitor C2 and the second pole of the charge and discharge port; the sixth switch module K6 is configured to be closed when the battery is charged or the battery is discharged.

[0150] By controlling the conduction and closing of the fifth switch module K5 and / or the sixth switch module K6, the on-off of the second capacitor C2 at the charge and discharge port, and the on-off between the battery and the charge and discharge port can be controlled.

[0151] In some embodiments, Figure 7 and Figure 8 As shown, the third switch module K3 is electrically connected between the first switch module K1 and the first pole of the battery, or, as shown Fig. 9 and Fig.12 As shown, the third switch module K3 is electrically connected between the first pole of the inverter and the first pole of the battery.

[0152] like Figure 7As shown, when the battery is charging or discharging, the first switch module K1, the second switch module K2, the third switch module K3, the fourth switch module K4, the fifth switch module K5 and the sixth switch module K6 are all closed, the closed switch modules are regarded as passages, and the capacitor is regarded as an open circuit. Figure 7 The circuit architecture can be regarded as Figure 1 The circuit structure shown.

[0153] Figure 7 The formation of the first branch, the second branch and the shunt branch formed by the charge and discharge circuit shown in FIG. Figure 1 , Figure 2 and Figure 3 The description is not repeated here.

[0154] like Figure 8 As shown, when the battery is charged or discharged, the first switch module K1, the second switch module K2, the third switch module K3, the fourth switch module K4, the fifth switch module K5 and the sixth switch module K6 are all closed, the closed switch modules are regarded as passages, and the capacitor is regarded as an open circuit. Figure 8 The circuit architecture can be regarded as Figure 4 The circuit structure shown. Figure 8 The formation of the first branch, the second branch and the shunt branch formed by the charge and discharge circuit shown in FIG. Figure 4 , Figure 5 and Figure 6 The description is not repeated here.

[0155] like Fig. 9 and Fig.12 As shown, when the battery is charged or discharged, the first switch module K1, the second switch module K2, the third switch module K3, the fourth switch module K4, the fifth switch module K5 and the sixth switch module K6 are closed, the closed switch modules are regarded as passages, and the capacitor is regarded as an open circuit. In this case, the third switch module K3 is also electrically connected to the shunt branch.

[0156] like Fig.10 and Fig.13 As shown, when the battery is charged or discharged, the inverter is configured to conduct from the third pole to the first pole of the inverter, and a part of the current flows from the first pole of the charge and discharge port through the first switch module K1 to the first pole of the battery, and the other part of the current flows from the first pole of the charge and discharge port, sequentially through the second switch module K2, the motor, the inverter, and the third switch module K3 to the first pole of the battery.

[0157] like Fig.11 and Fig.14As shown, when the battery is discharging, the inverter is configured so that the first pole to the third pole of the inverter are turned on, and a part of the current flows from the first pole of the charge and discharge port through the first switch module K1 to the first pole of the battery, and the other part of the current flows from the first pole of the battery, through the inverter, the motor, the second switch module K2 in sequence, to the first pole of the charge and discharge port.

[0158] In some embodiments, Fig.15 As shown, the first pole of the inverter is electrically connected to the first pole of the battery, the second pole of the inverter is electrically connected to the second pole of the battery, the third pole of the inverter is electrically connected to the first end of the motor; the second end of the motor is electrically connected to the first pole of the battery.

[0159] For example, Fig.15 As shown, the first switch module K1 is electrically connected between the first pole of the inverter and the first pole of the battery; the second end of the motor is electrically connected to the first pole of the battery through the second switch module K2.

[0160] In some embodiments, Fig.15 As shown, when the first pole of the battery is the positive pole and the second pole of the battery is the negative pole, correspondingly, the first pole of the charge and discharge port is the positive pole and the second pole of the charge and discharge port is the negative pole.

[0161] like Fig.16 As shown, when an external power source is connected to the charge and discharge port to charge the battery, the inverter is configured to conduct the first to third poles of the inverter, so that another part of the current flows from the first pole of the charge and discharge port, through the inverter and the motor in sequence, to the first pole of the battery.

[0162] like Fig.17 As shown, when the battery is discharging, the inverter is configured to conduct from the third pole to the first pole of the inverter, so that another part of the current flows from the first pole of the charge and discharge port, through the motor and the inverter in sequence, to the first pole of the charge and discharge port.

[0163] During the process of charging the battery or discharging the battery, a shunt branch and a first branch are simultaneously formed between the first pole of the battery and the first pole of the charge and discharge port. Compared with the solution of forming the first branch only between the first pole of the battery and the first pole of the charge and discharge port, the shunt flowing through the first branch during the battery charging or discharging process can be significantly reduced, so that the current on the first branch and the shunt branch is smaller than the charging current provided by the charge and discharge port or the discharging current provided by the battery, thereby protecting the first switch module K1 on the first branch from being damaged by large current, and the second switch module K2 on the shunt branch from being damaged by large current, thereby improving the life of the switch module in the charge and discharge circuit.

[0164] In addition, the current on the first branch and the shunt branch is smaller, and the heat and energy consumption during the battery charging or discharging process is also smaller, thereby improving the power conversion efficiency.

[0165] In other embodiments, Fig.18 As shown, when the first pole of the battery is the negative pole, the second pole of the battery is the positive pole, and the first pole of the charge and discharge port is the negative pole, correspondingly, the second pole of the charge and discharge port is the positive pole.

[0166] like Fig.19 As shown, when an external power source is connected to the charge and discharge port to charge the battery, the inverter is configured to conduct the third pole to the first pole of the inverter, so that another part of the current flows from the first pole of the battery, through the motor, the inverter, to the first pole of the charge and discharge port in sequence.

[0167] like Fig. 20 As shown, when discharging the battery, the inverter is configured to conduct from the first pole to the third pole of the inverter, so that another part of the current flows from the first pole of the charge and discharge port, through the inverter and the motor in sequence, to the first pole of the battery.

[0168] During the process of charging the battery or discharging the battery, a shunt branch and a first branch are simultaneously formed between the first pole of the battery and the first pole of the charge and discharge port. Compared with the solution of forming the first branch only between the first pole of the battery and the first pole of the charge and discharge port, the shunt flowing through the first branch during the battery charging or discharging process can be significantly reduced, so that the current on the first branch and the shunt branch is smaller than the charging current provided by the charge and discharge port, or the discharging current provided by the battery, thereby protecting the first switch module on the first branch from being damaged by large current, and the second switch module on the shunt branch from being damaged by large current, thereby improving the life of the switch module in the charge and discharge circuit.

[0169] In addition, the current on the first branch and the shunt branch is smaller, and the heat and energy consumption during the battery charging or discharging process is also smaller, thereby improving the power conversion efficiency.

[0170] Based on the above embodiments, in some embodiments, such as Fig.21 and Fig. 22 As shown, the charge and discharge circuit further includes a first capacitor C1, a first end of the first capacitor C1 is electrically connected to a first pole of the battery, and a second end of the first capacitor C1 is electrically connected to a second pole of the battery.

[0171] For example, Fig.21 and Fig. 22 As shown, the charge and discharge circuit further includes a third switch module K3 and / or a fourth switch module K4. The third switch module K3 is electrically connected between the first end of the first capacitor C1 and the first pole of the battery. The fourth switch module K4 is electrically connected between the second end of the first capacitor C1 and the second pole of the battery.

[0172] By controlling the on and off of the third switch module K3 and / or the fourth switch module K4, the on and off between the battery and the first capacitor C1, and the on and off between the battery and the charge and discharge port can be controlled.

[0173] In some embodiments, Fig.21 and Fig. 22 As shown, the charge and discharge circuit further includes a second capacitor C2, a first end of the second capacitor C2 is electrically connected to a first pole of the charge and discharge port, and a second end of the second capacitor C2 is electrically connected to a second pole of the charge and discharge port.

[0174] For example, Fig.21 and Fig. 22 As shown, the charge and discharge circuit further includes a fifth switch module K5 and / or a sixth switch module K6. The fifth switch module K5 is electrically connected between the first end of the second capacitor C2 and the first pole of the charge and discharge port. The sixth switch module K6 is electrically connected between the second end of the second capacitor C2 and the second pole of the charge and discharge port.

[0175] By controlling the conduction and closing of the fifth switch module K5 and / or the sixth switch module K6, the on-off of the second capacitor C2 at the charge and discharge port, and the on-off between the battery and the charge and discharge port can be controlled.

[0176] like Fig.21 As shown, when the battery is charging or discharging, the first switch module K1, the second switch module K2, the third switch module K3, the fourth switch module K4, the fifth switch module K5 and the sixth switch module K6 are all closed, the closed switch modules are regarded as passages, and the capacitor is regarded as an open circuit. Fig.21 The circuit architecture can be regarded as Fig.15 The circuit structure shown.

[0177] Fig.21 The formation of the first branch, the second branch and the shunt branch formed by the charge and discharge circuit shown in FIG. Fig.15 , Fig.16 and Fig.17 The description is not repeated here.

[0178] like Fig. 22 As shown, when the battery is charging or discharging, the first switch module K1, the second switch module K2, the third switch module K3, the fourth switch module K4, the fifth switch module K5 and the sixth switch module K6 are all closed, the closed switch modules are regarded as passages, and the capacitor is regarded as an open circuit. Fig. 22 The circuit architecture can be regarded as Fig.18 The circuit structure shown. Fig. 22 The formation of the first branch, the second branch and the shunt branch formed by the charge and discharge circuit shown in FIG. Fig.18 , Fig.19 and Fig. 20 The description is not repeated here.

[0179] In some embodiments, Fig. 20 and Fig.21 As shown, the first branch includes a first electrical connection line, and the shunt branch includes a second electrical connection line. The impedance of the first electrical connection line is greater than the impedance of the second electrical connection line.

[0180] The electrical connection wire on the first branch can be made of a material with a greater impedance than the wire on the shunt branch. On the one hand, this can reduce costs; on the other hand, the increased impedance on the first branch is more conducive to allocating current to the shunt branch.

[0181] In some embodiments, the material of the first electrical connection line includes aluminum-magnesium alloy or aluminum alloy, and the material of the second electrical connection line includes copper.

[0182] The electrical connection wire on the first branch can be made of magnesium-aluminum alloy or aluminum alloy to reduce cost and weight. The electrical connection wire on the shunt branch can be made of copper, which has smaller wire impedance and is more conducive to the shunt effect of the shunt branch on the first branch.

[0183] In some embodiments, Fig.23 , Fig.24 and Fig.25 As shown, the motor includes: a winding coil, a first end of the winding coil is electrically connected to a first end of the motor, and a second end of the winding coil is electrically connected to a second end of the motor. In the case of heating the battery, the charge and discharge circuit includes switching between a first stage and a second stage.

[0184] In the first stage, if Fig.23 As shown, the charging and discharging ports, the inverter and the winding coil form a loop; or, in the first stage, as Fig.24 As shown, the battery, inverter and winding coil form a loop.

[0185] In the second stage, if Fig.25 As shown, the charged winding coil forms a loop with the inverter.

[0186] In some embodiments, in the first stage, such as Fig.23 As shown, the inverter is configured to conduct from the third pole to the second pole of the inverter; the second switch module K2 is configured to be closed so that the current flows from the first pole of the charge and discharge port, through the second switch module K2, the winding coil, the inverter, to the second pole of the charge and discharge port, forming a loop.

[0187] In some other embodiments, in the first stage, such as Fig.24As shown, the third pole to the second pole of the inverter is conductive; the first switch module K1 and the second switch module K2 are configured to be closed so that the current flows from the first pole of the battery, through the first switch module K1, the second switch module K2, the winding coil, the inverter, to the second pole of the battery, forming a loop.

[0188] Based on the above embodiments, in some embodiments, such as Fig.25 As shown, in the second stage, the third pole to the first pole of the inverter is turned on, and the first switch module K1 and the second switch module K2 are configured to be closed so that the current flows from the first end of the winding coil through the inverter, the first switch module K1, the second switch module K2, to the second end of the winding coil to form a loop.

[0189] When the battery needs to be heated, the winding coil of the motor can be charged through the charging and discharging port or the battery first, and then the winding coil is discharged through the inverter corresponding to the motor, and the battery is heated in the process of charging and discharging the winding coil. Specifically, an external power source can be connected to the charging and discharging port to charge the winding coil through the charging and discharging port.

[0190] In some embodiments, Fig.26 , Fig. 27 and Fig.28 As shown, the motor includes: a winding coil, a first end of the winding coil is electrically connected to a first end of the motor, and a second end of the winding coil is electrically connected to a second end of the motor. In the case of heating the battery, the charge and discharge circuit includes switching between a first stage and a second stage.

[0191] In the first stage, the voltage provided by the charging and discharging port or the voltage output by the battery charges the winding coil via the inverter. In the second stage, the charged winding coil is discharged via the inverter.

[0192] In some embodiments, in the first stage, such as Fig.26 As shown, the inverter is configured to conduct from the second pole to the third pole of the inverter; the second switch module K2 is configured to be closed so that the current flows from the second pole of the charge and discharge port, through the inverter, the winding coil, the second switch module K2, to the first pole of the charge and discharge port, forming a loop.

[0193] In some other embodiments, in the first stage, such as Fig. 27 As shown, the second pole to the third pole of the inverter is turned on; the first switch module K1 and the second switch module K2 are configured to be closed so that the current flows from the second pole of the battery, through the inverter, the winding coil, the second switch module K2, the first switch module K1, to the first pole of the battery, forming a loop.

[0194] Based on the above embodiments, in some embodiments, in the second stage, such as Fig.28As shown, in the second stage, the inverter is configured to conduct from the first pole to the third pole of the inverter, and the first switch module K1 and the second switch module K2 are configured to be closed, so that the current flows from the second end of the winding coil, through the second switch module K2, the first switch module K1, the inverter, to the first end of the winding coil, forming a loop.

[0195] When the battery needs to be heated, the winding coil of the motor can be charged through the charging and discharging port or the battery first, and then the winding coil is discharged through the inverter corresponding to the motor, and the battery is heated in the process of charging and discharging the winding coil. Specifically, an external power source can be connected to the charging and discharging port to charge the winding coil through the charging and discharging port.

[0196] In some embodiments, Fig.29 , Fig.30 and Fig.31 As shown, the motor includes: a winding coil, a first end of the winding coil is electrically connected to a first end of the motor, and a second end of the winding coil is electrically connected to a second end of the motor. In the case of heating the battery, the charge and discharge circuit includes switching between a first stage and a second stage.

[0197] In the first stage, the voltage provided by the charging and discharging port or the voltage output by the battery charges the winding coil via the inverter. In the second stage, the charged winding coil is discharged via the inverter.

[0198] In some embodiments, in the first stage, such as Fig.29 As shown, the inverter is configured to conduct from the third pole to the second pole of the inverter; the first switch module K1 and the second switch module K2 are configured to be closed so that the current flows from the first pole of the charge and discharge port, through the first switch module K1, the second switch module K2, the winding coil, the inverter, to the second pole of the charge and discharge port, forming a loop.

[0199] In some other embodiments, in the first stage, such as Fig.30 As shown, the third pole to the second pole of the inverter is conductive; the second switch module K2 is configured to be closed so that the current flows from the first pole of the battery, through the second switch module K2, the winding coil, the inverter, to the second pole of the battery, forming a loop.

[0200] Based on the above embodiments, in some embodiments, in the second stage, such as Fig.31 As shown, the inverter is configured so that the third pole of the inverter is turned on to the first pole, and the first switch module K1 and the second switch module K2 are configured to be closed so that the current flows from the first end of the winding coil through the inverter, the first switch module K1, the second switch module K2 in sequence to the second end of the winding coil to form a loop.

[0201] When the battery needs to be heated, the winding coil of the motor can be charged through the charging and discharging port or the battery first, and then the winding coil is discharged through the inverter corresponding to the motor, and the battery is heated in the process of charging and discharging the winding coil. Specifically, an external power source can be connected to the charging and discharging port to charge the winding coil through the charging and discharging port.

[0202] In some embodiments, Fig.32 , Fig.33 and Fig.34 As shown, the motor includes: a winding coil, a first end of the winding coil is electrically connected to a first end of the motor, and a second end of the winding coil is electrically connected to a second end of the motor; when the battery is heated, the charge and discharge circuit includes switching between a first stage and a second stage.

[0203] In the first stage, if Fig.32 As shown, the charging and discharging ports, the inverter and the winding coil form a loop, or, in the first stage, as Fig.33 As shown, the battery, inverter and winding coil form a loop. In the second stage, as Fig.34 As shown, the charged winding coil forms a loop with the inverter.

[0204] In some embodiments, in the first stage, such as Fig.32 As shown, the inverter is configured to conduct from the second pole to the third pole of the inverter; the first switch module K1 and the second switch module K2 are configured to be closed, so that the current flows from the second pole of the charge and discharge port, through the inverter, the winding coil, the second switch module K2, the first switch module K1, to the first pole of the charge and discharge port, forming a loop.

[0205] In some embodiments, in the first stage, such as Fig.33 As shown, the second pole to the third pole of the inverter is turned on; the second switch module K2 is configured to be closed so that the current flows from the second pole of the battery, through the inverter, the winding coil, the second switch module K2, to the first pole of the battery, forming a loop.

[0206] In some embodiments, in the second stage, such as Fig.34 As shown, in the second stage, the inverter is configured to conduct from the first pole to the third pole of the inverter, and the first switch module K1 and the second switch module K2 are configured to be closed, so that the current flows from the second end of the winding coil, through the second switch module K2, the first switch module K1, the inverter, to the first end of the winding coil, forming a loop.

[0207] When the battery needs to be heated, the winding coil of the motor can be charged through the charging and discharging port or the battery first, and then the winding coil is discharged through the inverter corresponding to the motor, and the battery is heated in the process of charging and discharging the winding coil. Specifically, an external power source can be connected to the charging and discharging port to charge the winding coil through the charging and discharging port.

[0208] In some embodiments, Fig.34 As shown, the inverter includes: multi-phase bridge arms connected in parallel, each phase bridge arm is electrically connected between the first pole and the second pole of the inverter. Each phase bridge arm includes a first switch element and a second switch element, the first pole of the first switch element is electrically connected to the first pole of the inverter circuit, the second pole of the first switch element is electrically connected to the first pole of the second switch element, and the second pole of the second switch element is electrically connected to the second pole of the inverter circuit.

[0209] A common terminal of a first switching element and a second switching element serves as a third pole of the inverter.

[0210] For example, Fig.34 As shown, point A, point B and point C are all third poles of the inverter. The motor includes a first winding coil L1, a second winding coil L2 and a third winding coil L3, which are respectively connected to different third poles of the inverter.

[0211] Exemplarily, one end of a group of winding coils of the motor is connected to a common terminal of a first switching element and a second switching element of a phase bridge arm of the inverter.

[0212] In some embodiments, Fig.23 As shown, a first switching element includes a first transistor VT1 / VT3 / VT5 and a first diode VD1 / VD3 / VD5, and a second switching element includes a second transistor VT2 / VT4 / VT6 and a second diode VD2 / VD4 / VD6.

[0213] The first transistor VT1 / VT3 / VT5 and the first diode VD1 / VD3 / VD5 are connected in parallel between the first pole of the inverter and a third pole of the inverter, and the second transistor VT2 / VT4 / VT6 and the second diode VD2 / VD4 / VD6 are connected in parallel between the second pole of the inverter and a third pole of the inverter.

[0214] like Fig.23 As shown, the first transistor VT1 and the first diode VD1 constitute a first switching element of a bridge arm of one phase of the inverter, and the second transistor VT2 and the second diode VD2 constitute a second switching element of the bridge arm of one phase of the inverter.

[0215] like Fig.23As shown, the first transistor VT3 and the first diode VD3 constitute a first switching element of a bridge arm of one phase of the inverter, and the second transistor VT4 and the second diode VD4 constitute a second switching element of the bridge arm of one phase of the inverter.

[0216] like Fig.23 As shown, the first transistor VT5 and the first diode VD5 constitute a first switching element of a bridge arm of one phase of the inverter, and the second transistor VT6 and the second diode VD6 constitute a second switching element of the bridge arm of one phase of the inverter.

[0217] like Fig.23 As shown, when the third pole to the second pole of the inverter is turned on, the first transistor VT1 / VT3 / VT5 is configured to be turned on, and the first diode VD1 / VD3 / VD5 is turned off.

[0218] like Fig.25 As shown, when the third pole to the first pole of the inverter is turned on, the first transistor VT1 / VT3 / VT5 is configured to be turned off, and the first diode VD1 / VD3 / VD5 is turned on.

[0219] like Fig.26 As shown, when the second pole of the inverter is turned on to the third end, the second transistor VT2 / VT4 / VT6 is configured to be turned off, and the first diode VD1 / VD3 / VD5 is turned on.

[0220] like Fig.28 As shown, when the first to third poles of the inverter are turned on, the first transistor VT1 / VT3 / VT5 is configured to be turned on, and the first diode VD1 / VD3 / VD5 is turned off.

[0221] When the first pole and the third end, or the second end and the third end of the inverter are turned on, the first pole and the third end, or the second end and the third end of the inverter may be connected by a first switching element or a second switching element through at least one phase bridge arm.

[0222] For example, in the case where the inverter includes three-phase bridge arms, such as Fig.25 As shown, the second pole and the third end of the inverter may be electrically connected through one or more (two or more) of the first diode VD1, the first diode VD3 and the first diode VD5.

[0223] like Fig. 27 As shown, the first pole and the third end of the inverter may be electrically connected through one or more (two or more) of the second transistor VT2, the second transistor VT4 and the second transistor VT6.

[0224] like Fig.28As shown, the first pole and the third end of the inverter may be electrically connected through one or more (two or more) of the first transistor VT1, the first transistor VT3 and the first transistor VT5.

[0225] When the battery charging and heating is turned on, the battery can be heated while charging by controlling the change in the conduction direction of the inverter, which can achieve high-power heating of the battery. At the same time, the current of each phase arm of the inverter is balanced and the heating is consistent. High-power heating is achieved at low temperatures, the motor phase current is basically consistent, and the battery is heated more evenly.

[0226] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art who is familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A charging and discharging circuit, characterized in that: include: A first branch is electrically connected to a first pole of the battery and a first pole of the charge and discharge port; a first switch module is electrically connected to the first branch; A second branch electrically connecting the second pole of the battery and the second pole of the charge and discharge port; A shunt branch, comprising a voltage conversion module and a second switch module connected in series with the voltage conversion module, the shunt branch being connected between the charge and discharge port and the battery; When the battery is charged in a first charging mode, or when the battery is discharged in a first discharging mode, the first switch module and the second switch module are configured to be closed so that a portion of the current flows through the first branch and another portion of the current flows through the shunt branch. The first charging mode includes a charging mode that does not use the voltage conversion module to perform voltage conversion, and the first discharging mode is a discharging mode that does not use the voltage conversion module to perform voltage conversion.

2. The charge and discharge circuit according to claim 1, characterized in that: The voltage conversion module includes an inverter and a motor; the two poles of the inverter are electrically connected to the first pole of the battery and the second pole of the battery respectively, the first end of the motor is electrically connected to the inverter, the second end of the motor is electrically connected to the first pole of the charging and discharging port or the first pole of the battery, and the second switch module is connected in series with the inverter and the motor.

3. The charge and discharge circuit according to claim 2, characterized in that: The first pole of the inverter is electrically connected to the first pole of the battery, the second pole of the inverter is electrically connected to the second pole of the battery, the third pole of the inverter is electrically connected to the first end of the motor; the second end of the motor is electrically connected to the first pole of the charging and discharging port.

4. The charge and discharge circuit according to claim 3, characterized in that: When an external power source is connected to the charge and discharge port to charge the battery, the inverter is configured to conduct from the third pole to the first pole of the inverter, so that the other part of the current flows from the first pole of the charge and discharge port, through the motor and the inverter in sequence, to the first pole of the battery.

5. The charge and discharge circuit according to claim 3, characterized in that: When the battery is discharging, the inverter is configured to conduct from the first pole to the third pole of the inverter, so that the other part of the current flows from the first pole of the battery, through the inverter and the motor in sequence, to the first pole of the charging and discharging port.

6. The charge and discharge circuit according to claim 3, characterized in that: When an external power source is connected to the charge and discharge port to charge the battery, the inverter is configured to conduct the first pole to the third pole of the inverter so that the other part of the current flows from the first pole of the battery, through the inverter, the motor, the second switch module, in sequence, to the first pole of the charge and discharge port.

7. The charge and discharge circuit according to claim 3, characterized in that: When the battery is discharging, the inverter is configured to conduct from the third pole to the first pole of the inverter, so that the other part of the current flows from the first pole of the charge and discharge port, through the motor and the inverter in sequence, to the first pole of the battery.

8. The charge and discharge circuit according to any one of claims 3 to 7, characterized in that: The first switch module is electrically connected between the first pole of the inverter and the first pole of the charge and discharge port; the second end of the motor is electrically connected to the first pole of the charge and discharge port through the second switch module.

9. The charge and discharge circuit according to claim 2, characterized in that: The first pole of the inverter is electrically connected to the first pole of the battery, the second pole of the inverter is electrically connected to the second pole of the battery, and the third pole of the inverter is electrically connected to the first end of the motor; The second end of the motor is electrically connected to the first pole of the battery.

10. The charge and discharge circuit according to claim 9, characterized in that: When an external power source is connected to the charge and discharge port to charge the battery, the inverter is configured to conduct the first pole to the third pole of the inverter so that the other part of the current flows from the first pole of the charge and discharge port, through the inverter and the motor in sequence, to the first pole of the battery.

11. The charge and discharge circuit according to claim 9, characterized in that: When the battery is discharging to the outside, the inverter is configured to conduct from the third pole to the first pole of the inverter, so that the other part of the current flows from the first pole of the charging and discharging port, through the motor and the inverter in sequence, to the first pole of the charging and discharging port.

12. The charge and discharge circuit according to claim 9, characterized in that: When an external power source is connected to the charge and discharge port to charge the battery, the inverter is configured to conduct from the third pole to the first pole of the inverter, so that the other part of the current flows from the first pole of the battery, through the motor and the inverter in sequence, to the first pole of the charge and discharge port.

13. The charge and discharge circuit according to claim 9, characterized in that: When discharging the battery, the inverter is configured to conduct from the first pole to the third pole of the inverter so that the other part of the current flows from the first pole of the charge and discharge port, through the inverter and the motor in sequence, to the first pole of the battery.

14. The charge and discharge circuit according to any one of claims 9 to 13, characterized in that: The first switch module is electrically connected between the first pole of the inverter and the first pole of the battery; the second end of the motor is electrically connected to the first pole of the battery through the second switch module.

15. The charge and discharge circuit according to any one of claims 1 to 14, characterized in that: The charging and discharging circuit further comprises: a first capacitor, wherein a first end of the first capacitor is electrically connected to a first electrode of the battery, and a second end of the first capacitor is electrically connected to a second electrode of the battery; The third switch module is electrically connected between the first end of the first capacitor and the first pole of the battery; and / or the fourth switch module is electrically connected between the second end of the first capacitor and the second pole of the battery.

16. The charge and discharge circuit according to claim 15, characterized in that: When the second end of the motor is electrically connected to the first pole of the charge and discharge port, The third switch module is electrically connected between the first switch module and the first pole of the battery; or, The third switch module is electrically connected between the first pole of the inverter and the first pole of the battery.

17. The charge and discharge circuit according to any one of claims 1 to 16, characterized in that: The charging and discharging circuit further comprises: a second capacitor, wherein a first end of the second capacitor is electrically connected to a first pole of the charge-discharge port, and a second end of the second capacitor is electrically connected to a second pole of the charge-discharge port; a fifth switch module, electrically connected between the first end of the second capacitor and the first pole of the charge and discharge port; and / or a sixth switch module, electrically connected between the second end of the second capacitor and the second pole of the charge and discharge port.

18. The charge and discharge circuit according to any one of claims 1 to 17, characterized in that: The first branch includes a first connecting line, and the shunt branch includes a second connecting line; The impedance of the first connecting line is greater than the impedance of the second connecting line.

19. The charge and discharge circuit according to claim 18, characterized in that: The material of the first connecting wire includes aluminum-magnesium alloy or aluminum alloy, and the material of the second connecting wire includes copper.

20. The charge and discharge circuit according to claim 3, characterized in that: The motor comprises: a winding coil, a first end of the winding coil being electrically connected to a first end of the motor, and a second end of the winding coil being electrically connected to a second end of the motor; In case of heating the battery, the charging and discharging circuit includes switching between a first stage and a second stage; In the first stage, the charging and discharging port, the inverter and the winding coil form a loop, or the battery, the inverter and the winding coil form a loop; In the second stage, the charged winding coil and the inverter form a loop.

21. The charge and discharge circuit according to claim 20, characterized in that: In the first stage, the inverter is configured so that the third pole to the second pole of the inverter is turned on; The second switch module is configured to be closed so that the current flows from the first pole of the charge and discharge port, sequentially through the second switch module, the winding coil, the inverter, to the second pole of the charge and discharge port to form a loop; or, The first switch module and the second switch module are configured to be closed so that the current flows from the first pole of the battery through the first switch module, the second switch module, the winding coil, the inverter, and the second pole of the battery to form a loop.

22. The charge and discharge circuit according to claim 21, characterized in that: In the second stage, the inverter is configured to conduct from the third pole to the first pole of the inverter, and the first switch module and the second switch module are configured to be closed so that the current flows from the first end of the winding coil through the inverter, the first switch module, the second switch module, to the second end of the winding coil to form a loop.

23. The charge and discharge circuit according to claim 3, characterized in that: The motor comprises: a winding coil, a first end of the winding coil being electrically connected to a first end of the motor, and a second end of the winding coil being electrically connected to a second end of the motor; In case of heating the battery, the charging and discharging circuit includes switching between a first stage and a second stage; In the first stage, the voltage provided by the charging and discharging port, or the voltage output by the battery, charges the winding coil via the inverter; In the second stage, the charged winding coil is discharged through the inverter.

24. The charge and discharge circuit according to claim 23, characterized in that: In the first stage, the inverter is configured so that the second pole to the third pole of the inverter are turned on; The second switch module is configured to be closed so that the current flows from the second pole of the charge and discharge port, sequentially through the inverter, the winding coil, the second switch module, to the first pole of the charge and discharge port to form a loop; or, The first switch module and the second switch module are configured to be closed so that the current flows from the second pole of the battery through the inverter, the winding coil, the second switch module, the first switch module, to the first pole of the battery to form a loop.

25. The charge and discharge circuit according to claim 24, characterized in that: In the second stage, the inverter is configured to conduct from the first pole to the third pole of the inverter, and the first switch module and the second switch module are configured to be closed so that the current flows from the second end of the winding coil, through the second switch module, the first switch module, the inverter, to the first end of the winding coil, forming a loop.

26. The charge and discharge circuit according to claim 9, characterized in that: The motor comprises: a winding coil, a first end of the winding coil being electrically connected to a first end of the motor, and a second end of the winding coil being electrically connected to a second end of the motor; In case of heating the battery, the charging and discharging circuit includes switching between a first stage and a second stage; In the first stage, the voltage provided by the charging and discharging port, or the voltage output by the battery, charges the winding coil via the inverter; In the second stage, the charged winding coil is discharged through the inverter.

27. The charge and discharge circuit according to claim 26, characterized in that: In the first stage, the inverter is configured so that the third pole to the second pole of the inverter is turned on; The first switch module and the second switch module are configured to be closed so that the current flows from the first pole of the charge and discharge port, sequentially through the first switch module, the second switch module, the winding coil, the inverter, to the second pole of the charge and discharge port to form a loop; or, The second switch module is configured to be closed so that the current flows from the first pole of the battery through the second switch module, the winding coil, the inverter, and the second pole of the battery to form a loop.

28. The charge and discharge circuit according to claim 27, characterized in that: In the second stage, the inverter is configured to conduct from the third pole to the first pole of the inverter, and the first switch module and the second switch module are configured to be closed so that the current flows from the first end of the winding coil through the inverter, the first switch module, the second switch module in sequence, to the second end of the winding coil to form a loop.

29. The charge and discharge circuit according to claim 9, characterized in that: The motor comprises: a winding coil, a first end of the winding coil being electrically connected to a first end of the motor, and a second end of the winding coil being electrically connected to a second end of the motor; In case of heating the battery, the charging and discharging circuit includes switching between a first stage and a second stage; In the first stage, the charging and discharging port, the inverter and the winding coil form a loop, or the battery, the inverter and the winding coil form a loop; In the second stage, the charged winding coil and the inverter form a loop.

30. The charge and discharge circuit according to claim 29, characterized in that: In the first stage, the inverter is configured so that the second pole to the third pole of the inverter are turned on; The first switch module and the second switch module are configured to be closed so that the current flows from the second pole of the charge and discharge port, sequentially through the inverter, the winding coil, the second switch module, the first switch module, to the first pole of the charge and discharge port to form a loop; or, The second switch module is configured to be closed so that the current flows from the second pole of the battery, sequentially through the inverter, the winding coil, the second switch module, to the first pole of the battery, forming a loop.

31. The charge and discharge circuit according to claim 30, characterized in that: In the second stage, the inverter is configured to conduct from the first pole to the third pole of the inverter, and the first switch module and the second switch module are configured to be closed so that the current flows from the second end of the winding coil, through the second switch module, the first switch module, the inverter, to the first end of the winding coil, forming a loop.

32. The charge and discharge circuit according to any one of claims 3 to 31, characterized in that: The inverter comprises: multi-phase bridge arms connected in parallel; each phase of the bridge arm is electrically connected between a first pole and a second pole of the inverter; The bridge arm of each phase includes a first switching element and a second switching element, wherein the first pole of the first switching element is electrically connected to the first pole of the inverter circuit, the second pole of the first switching element is electrically connected to the first pole of the second switching element, and the second pole of the second switching element is electrically connected to the second pole of the inverter circuit; a common terminal of the first switching element and the second switching element serves as a third pole of the inverter.

33. The charge and discharge circuit according to claim 32, characterized in that: The motor comprises: a winding coil, a first end of the winding coil being electrically connected to a first end of the motor, and a second end of the winding coil being electrically connected to a second end of the motor; One end of a group of winding coils of the motor is electrically connected to a third pole of the inverter.

34. The charge and discharge circuit according to claim 32 or 33, characterized in that: One of the first switching elements includes a first transistor and a first diode, and one of the second switching elements includes a second transistor and a second diode; the first transistor and the first diode are connected in parallel between the first pole of the inverter and a third pole of the inverter, and the second transistor and the second diode are connected in parallel between the second pole of the inverter and a third pole of the inverter.

35. The charge and discharge circuit according to claim 34, characterized in that: When the first to third electrodes of the inverter are turned on, the first transistor is configured to be turned on and the first diode is turned off; When the third pole to the first pole of the inverter is turned on, the first transistor is configured to be turned off and the first diode is turned on; When the second pole to the third pole of the inverter are turned on, the second transistor is configured to be turned off, and the first diode is turned on; When the third pole to the second pole of the inverter is turned on, the first transistor is configured to be turned on and the first diode is turned off.

36. A charging and discharging system, characterized in that: include: The charging and discharging circuit as claimed in any one of claims 1 to 35; and A controller, electrically connected to the inverter, the first switch module and the second switch module respectively; The controller is configured to control the first switch module to form the first branch; and control the second switch module and the inverter to form the shunt branch.

37. A means of transport, characterized in that: Comprising the charging and discharging system as claimed in claim 36.

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