Direct current charging and discharging device, system and vehicle

Abstract

The present disclosure relates to a direct current charging and discharging device, system and vehicle, which is applied to a vehicle, the direct current charging and discharging device comprising a boost DC module, a power distribution module, a battery pack and a charging and discharging port, the boost DC module comprising a boost DC module, the boost DC module comprising at least one bridge arm and an inductor; the battery pack, the boost DC module and the charging and discharging port are connected in parallel through a switch circuit, and one end of the inductor is connected to the midpoint of the bridge arm, and the other end is connected to the positive electrode of the battery pack and the positive electrode of the charging and discharging port through the switch circuit; the charging and discharging port is used for connecting an external power consuming device or an external power supply device; the power distribution module is used for connecting the switch circuit to form different connection loops according to the voltage of the battery pack and the voltage of the charging and discharging port, so that the battery pack discharges direct current to the external power consuming device or makes the external power supply device charge direct current to the battery pack.

Description

Technical Field

[0001] This disclosure relates to the field of battery technology, and more specifically, to a DC charging and discharging device, system, and vehicle. Background Technology

[0002] With the development of the hybrid vehicle industry, vehicle-to-vehicle (VTOV) power delivery has been widely applied in various scenarios. Depending on the function, VTOV can be broadly categorized into two types: VTOV and VTOL. VTOV allows the vehicle's internal power to be transferred to other vehicles, replenishing their batteries and enabling vehicle-to-vehicle charging. VTOL, on the other hand, converts the vehicle's internal electrical energy into AC power for external output, directly charging electrical appliances such as induction cookers, microwave ovens, and mobile phones, thus providing external power. Summary of the Invention

[0003] The purpose of this disclosure is to provide a DC charging and discharging device, system, and vehicle to solve the aforementioned technical problems.

[0004] According to a first aspect of the present disclosure, a DC charging and discharging device is provided for use in a vehicle.

[0005] It includes a boost DC module, a power distribution module, a battery pack, and a charging / discharging port. The boost DC module includes at least one bridge arm and an induction coil.

[0006] The battery pack, the boost DC module, and the charging / discharging port are connected in parallel in sequence via a switch circuit. One end of the induction coil is connected to the midpoint of the bridge arm, and the other end is connected to the positive terminal of the battery pack and the positive terminal of the charging / discharging port via the switch circuit.

[0007] The charging / discharging port is used to connect to an external electrical device or an external power supply device;

[0008] The power distribution module is used to connect the switching circuit according to the voltage of the battery pack and the voltage of the charging / discharging port to form different connection circuits, so that the battery pack can DC discharge to the external power device or enable the external power supply device to DC charge the battery pack.

[0009] Optionally, the connection loop includes:

[0010] The first circuit includes a connection line connecting the positive terminal of the battery pack to the upper end of the bridge arm, and a connection line connecting the midpoint of the bridge arm to the positive terminal of the charging / discharging port.

[0011] The second circuit includes a connection line connecting the positive terminal of the battery pack to the midpoint of the bridge arm, and a connection line connecting the upper end of the bridge arm to the positive terminal of the charging / discharging port.

[0012] The third circuit includes a connection line that connects the positive terminal of the battery pack, the midpoint of the bridge arm, and the positive terminal of the charging / discharging port.

[0013] Optionally, the switching circuit includes:

[0014] A first switch disposed between the positive terminal of the battery pack and the upper end of the bridge arm; a second switch disposed between one end of the induction coil and the positive terminal of the charging / discharging port; and

[0015] A third switch is disposed between the positive terminal of the battery pack and the other end of the induction coil; a fourth switch is disposed between the upper end of the bridge arm and the positive terminal of the charging / discharging port; and

[0016] The fifth switch in the third circuit is located between the positive terminal of the battery pack and the other end of the induction coil;

[0017] When the first switch and the second switch are turned on, the first circuit is formed.

[0018] When the third switch and the fourth switch are turned on, the second circuit is formed.

[0019] When the fifth switch and the second switch are turned on, the third circuit is formed.

[0020] Optionally, the first circuit is provided with a first fuse, the second circuit is provided with a second fuse and a third fuse, and the third circuit is provided with a first fuse and a third fuse.

[0021] Optionally, a pre-charge resistor is also provided on the third circuit, and the pre-charge resistor is provided on the connection line between the fifth switch and the third fuse.

[0022] Optionally, the switching circuit further includes a sixth switch disposed between the negative terminal of the battery pack and the lower end of the bridge arm, and a seventh switch disposed between the negative terminal of the charging / discharging port and the lower end of the bridge arm;

[0023] The first circuit, the second circuit, and the third circuit all include connection lines that connect the sixth switch and the seventh switch to connect the negative terminal of the battery pack, the lower end of the bridge arm, and the negative terminal of the charging / discharging port.

[0024] Optionally, it also includes a main controller, which is connected to the boost DC module, the power distribution module, the battery pack, and the charging / discharging port, respectively. The main controller is used for:

[0025] When the voltage of the battery pack is higher than the voltage of the charging / discharging port, the power distribution module is controlled to connect the first circuit;

[0026] If the voltage of the battery pack is lower than the voltage of the charging / discharging port, the power distribution module is controlled to connect the second circuit;

[0027] When the voltage of the battery pack is equal to the required voltage of the charging / discharging port, the power distribution module is controlled to connect the third circuit.

[0028] Optionally, it also includes a generator module, which is connected in parallel with the boost DC module and the charging / discharging port.

[0029] The generator module is used to generate DC power to obtain DC voltage, and to discharge DC power to the external electrical device through the charging and discharging port.

[0030] Optionally, the generator module includes a multiphase motor and an engine, wherein the engine is connected to each phase of the multiphase motor;

[0031] The upper bridge arm of the multiphase motor is connected to the positive terminal of the charging / discharging port;

[0032] The lower bridge arm of the multiphase motor is connected to the negative terminal of the charging / discharging port.

[0033] Optionally, the generator module is also connected in parallel with a capacitor module, the two ends of which are respectively connected to the upper and lower bridge arms of the multiphase motor.

[0034] According to a second aspect of the present disclosure, a DC charging and discharging system includes:

[0035] A DC discharge device and a DC charging device, wherein the DC discharge device and the DC charging device are based on the DC charging and discharging device described in the first aspect.

[0036] The DC discharge device has a first charging / discharging port, and the DC charging device has a second charging / discharging port. The first charging / discharging port and the second charging / discharging port are connected to each other so that the DC discharge device can charge the DC charging device.

[0037] Optionally, the DC charging and discharging device further includes a connecting device, wherein a first end of the connecting device is connected to the first charging and discharging port, and a second end of the connecting device is connected to the second charging and discharging port.

[0038] According to a third aspect of the present disclosure, a vehicle is provided, characterized in that it includes the DC charging and discharging device described in the first aspect.

[0039] The technical solutions provided by the embodiments of this disclosure may include the following beneficial effects:

[0040] The power distribution module connects switching circuits based on the battery pack voltage and the voltage at the charging / discharging port to form different connection loops. This allows the battery pack to DC discharge to external electrical devices or to DC charge the battery pack from external power sources, achieving DC external discharge and DC VTOV functionality. Furthermore, in different connection loops, a boost DC module can be reused to boost or buck the voltage output from the battery pack or the voltage input through the charging / discharging port, adjusting it to the voltage required by the vehicle's charging / discharging port or battery pack. This broadens the range of voltage output from the vehicle's battery pack or input through the charging / discharging port, resulting in high compatibility. Simultaneously, by reusing the boost DC module to achieve high-power DC charging and discharging, the utilization rate of device performance is improved, reducing the overall vehicle cost.

[0041] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0042] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0043] Figure 1 This is a circuit diagram of a charging circuit provided in an embodiment of this disclosure.

[0044] Figure 2 This is a circuit diagram of a DC charging and discharging device provided in an embodiment of this disclosure.

[0045] Figure 3 This is a schematic diagram of a first circuit provided in an embodiment of this disclosure.

[0046] Figure 4 This is a schematic diagram of a second circuit provided in an embodiment of this disclosure.

[0047] Figure 5 This is a schematic diagram of a third circuit provided in an embodiment of this disclosure.

[0048] Figure 6 This is a circuit diagram of another DC charging and discharging device provided in an embodiment of this disclosure.

[0049] Figure 7 This is a schematic diagram of a DC discharge circuit provided in an embodiment of this disclosure.

[0050] Figure 8 This is a schematic diagram of another DC discharge circuit provided in an embodiment of this disclosure.

[0051] Figure 9 This is a schematic diagram of another DC discharge circuit provided in an embodiment of this disclosure.

[0052] Figure 10This is a circuit diagram of another DC charging and discharging device provided in an embodiment of this disclosure.

[0053] Explanation of reference numerals in the attached figures

[0054] 101-Boost DC Module 102-Power Distribution Module

[0055] 103-Battery pack 104-Charging / discharging port

[0056] 105-Generator Module 106-Connection Device Detailed Implementation

[0057] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0058] The inventors discovered that in existing vehicle external discharge and AC VTOV functions, the control system consists of a power battery pack, a bidirectional OBC (On Board Charger) system, a discharge switch button, an in-vehicle discharge relay, an external discharge relay, a discharge plug, and a discharge gun. The charging circuit is as follows: Figure 1 As shown, it can only realize AC external discharge function, and has no DC charging and discharging port, so it cannot realize DC external discharge function.

[0059] In view of this, the present disclosure provides a DC charging and discharging device for use in vehicles. For example... Figure 2 As shown, the DC charging and discharging device includes a boost DC module 101, a power distribution module 102, a battery pack 103, and a charging and discharging port 104. The boost DC module includes at least one bridge arm and an induction coil.

[0060] The battery pack 103, the boost DC module, and the charging / discharging port 104 are connected in parallel in sequence through a switching circuit, and one end of the induction coil is connected to the midpoint of the bridge arm, while the other end is connected to the positive terminal of the battery pack 103 and the positive terminal of the charging / discharging port 104 through the switching circuit.

[0061] The charging / discharging port 104 is used to connect to an external electrical device or an external power supply device;

[0062] The power distribution module 102 is used to connect the switching circuit according to the voltage of the battery pack 103 and the voltage of the charging / discharging port 104 to form different connection circuits, so that the battery pack 103 can DC discharge to external electrical devices or enable external power supply devices to DC charge the battery pack 103.

[0063] First, it should be understood that the charging / discharging port 104 is a connection port with both charging and discharging functions. When the battery pack 103 is discharging, it can discharge DC power through the charging / discharging port 104 to provide DC voltage to external electrical devices. When charging the battery pack 103, an external power supply device can input DC voltage through the charging / discharging port 104. This embodiment does not limit the specific form of the charging / discharging port 104. Both the external electrical device and the external power supply device can be a vehicle or the battery pack 103. This embodiment does not limit the specific form of the charging / discharging port 104 or the number of external electrical devices or external power supply devices.

[0064] like Figure 2 As shown, the boost DC module may include a bridge arm and an induction coil L1. The positive terminal of the bridge arm is connected to both the positive terminal of the charge / discharge port 104 and the positive terminal of the battery pack 103. The negative terminal of the bridge arm is also connected to both the negative terminal of the charge / discharge port 104 and the negative terminal of the battery pack 103. The first end of the induction coil L1 is connected to the connection line between the two switching transistors of the bridge arm, and the second end of the induction coil L1 is connected to the connection line between the positive terminal of the battery pack 103 and the positive terminal of the charge / discharge port 104. The bridge arm includes switching transistors Q1 and Q2. The positive terminal of the bridge arm (i.e., the terminal of switching transistor Q1) is connected to both the positive terminal of the charge / discharge port 104 and the positive terminal of the battery pack 103, and the negative terminal of the bridge arm (i.e., the terminal of switching transistor Q2) is connected to both the negative terminal of the charge / discharge port 104 and the negative terminal of the battery pack 103.

[0065] Using the aforementioned DC charging and discharging equipment, the power distribution module 102 connects the switching circuit according to the voltage of the battery pack 103 and the voltage of the charging / discharging port 104 to form different connection circuits. This allows the battery pack 103 to DC discharge to external electrical devices or to DC charge the battery pack 103 from external power supplies, realizing DC external discharge and DC VTOV functions. Furthermore, in different connection circuits, the boost DC module can be reused to boost or buck the voltage output from the battery pack 103 or the voltage input through the charging / discharging port 104 to adjust it to the voltage required by the vehicle's charging / discharging port 104 or the battery pack 103. This broadens the range of voltage output from the vehicle's battery pack 103 or input through the charging / discharging port 104, resulting in high compatibility. Simultaneously, by reusing the boost DC module to achieve high-power DC charging and discharging, the utilization rate of device performance is improved, and the overall vehicle cost is reduced.

[0066] In one embodiment, the connection circuit includes: a first circuit, including a connection line connecting the positive terminal of the battery pack 103 to the upper end of the bridge arm and a connection line connecting the midpoint of the bridge arm to the positive terminal of the charging / discharging port 104; a second circuit, including a connection line connecting the positive terminal of the battery pack 103 to the midpoint of the bridge arm and a connection line connecting the upper end of the bridge arm to the positive terminal of the charging / discharging port 104; and a third circuit, including a connection line connecting the positive terminal of the battery pack 103, the midpoint of the bridge arm, and the positive terminal of the charging / discharging port 104.

[0067] In one embodiment, such as Figure 2 As shown, the switching circuit includes: a first switch disposed between the positive terminal of the battery pack 103 and the upper end of the bridge arm; a second switch disposed between one end of the induction coil and the positive terminal of the charging / discharging port 104; a third switch disposed between the positive terminal of the battery pack 103 and the other end of the induction coil in the second circuit; a fourth switch disposed between the upper end of the bridge arm and the positive terminal of the charging / discharging port 104; and a fifth switch disposed between the positive terminal of the battery pack 103 and the first end of the induction coil in the third circuit; wherein, when the first switch and the second switch are turned on, a first circuit is formed; when the third switch and the fourth switch are turned on, a second circuit is formed; and when the fifth switch and the second switch are turned on, a third circuit is formed.

[0068] In one embodiment, such as Figure 2 As shown, the switch circuit also includes a sixth switch disposed between the negative terminal of the battery pack 103 and the lower end of the bridge arm, and a seventh switch disposed between the negative terminal of the charging / discharging port and the lower end of the bridge arm. The first circuit, the second circuit, and the third circuit all include connection lines for connecting the sixth switch and the seventh switch to connect the negative terminal of the battery pack 103, the lower end of the bridge arm, and the negative terminal of the charging / discharging port.

[0069] For example, when the first switch, second switch, sixth switch, and seventh switch are turned on, the positive terminal of the battery pack 103, the upper end of the bridge arm, the switching transistor Q1, the induction coil L1, the positive terminal of the charging / discharging port 104, the negative terminal of the charging / discharging port 104, and the negative terminal of the battery pack 103 can be connected to form a configuration as shown in the example. Figure 3 The first loop is shown by the thick line in the diagram.

[0070] For example, when the third, fourth, sixth, and seventh switches are turned on, the positive terminal of the battery pack 103, the midpoint of the bridge arm, the induction coil L1, the switching transistor Q1, the positive and negative terminals of the charging / discharging port 104, and the negative terminal of the battery pack 103 can be connected to form a configuration as shown in the example. Figure 4 The second loop is shown by the thick line in the diagram.

[0071] For example, when the third, second, sixth, and seventh switches are turned on, the positive terminal of the battery pack 103, the midpoint of the bridge arm, the positive terminal of the charging / discharging port 104, the negative terminal of the charging / discharging port 104, and the negative terminal of the battery pack 103 can be directly connected to form a configuration as shown in the example. Figure 5The third loop is shown by the thick line in the diagram.

[0072] In one embodiment, the first circuit is provided with a first fuse FU1, the second circuit is provided with a second fuse FU2 and a third fuse, and the third circuit is provided with a first fuse FU1 and a third fuse FU3.

[0073] For example, such as Figure 2 As shown, the first fuse FU1 is installed on the connection line between the induction coil L1 of the boost DC module and the positive terminal of the charging / discharging port 104, the second fuse FU2 is installed on the connection line between the positive terminal of the boost DC module and the positive terminal of the charging / discharging port 104, and the third fuse FU3 is installed on the connection line between the first fuse FU1 and the second switch.

[0074] In one embodiment, such as Figure 2 As shown, a pre-charge resistor R1 is also provided on the third circuit. The pre-charge resistor is located on the connection line between the fifth switch and the third fuse.

[0075] In one embodiment, the DC charging and discharging device further includes a main controller, which is connected to a boost DC module 101, a power distribution module 102, a battery pack 103, and a charging / discharging port 104, respectively. The main controller is used to control the power distribution module 102 to connect a first circuit when the voltage of the battery pack 103 is higher than the voltage of the charging / discharging port 104; to control the power distribution module 102 to connect a second circuit when the voltage of the battery pack 103 is lower than the voltage of the charging / discharging port 104; and to control the power distribution module 102 to connect a third circuit when the voltage of the battery pack 103 is equal to the required voltage of the charging / discharging port 104.

[0076] For example, such as Figure 3 As shown, when the voltage of the battery pack 103 is higher than the voltage of the charging / discharging port 104, the main controller can control the power distribution module 102 to connect the first circuit, thereby controlling the boost DC module to boost the DC voltage input from the charging / discharging port 104 to the required voltage of the battery pack 103 through the charging circuit shown by the thick solid line, in order to charge the battery pack 103. Alternatively, the main controller can control the boost DC module to step down the DC voltage output from the battery pack 103 to the required voltage of the charging / discharging port 104 through the discharging circuit shown by the thick dashed line.

[0077] For example, if the voltage of the battery pack 103 is higher than the voltage of the charging / discharging port 104, the main controller can control the state of each switching element as shown in Table 1. In the charging state, the first switch KA1, the second switch KA2, the sixth switch KA6, and the seventh switch KA7 are closed, while the third switch KA3, the fourth switch KA4, and the fifth switch KA5 are open. Switches Q1 and Q2 operate according to boost mode logic. Thus, the boost DC module will... Figure 3The charging circuit, shown by the thick solid line, boosts the DC voltage input through the charging / discharging port 104 to the required voltage of the battery pack 103. In the discharging state, the first switch KA1, the second switch KA2, the sixth switch KA6, and the seventh switch KA7 are closed, while the third switch KA3, the fourth switch KA4, and the fifth switch KA5 are open. Switches Q1 and Q2 operate in buck mode logic. Thus, the boost DC module will... Figure 3 The discharge circuit, shown by the thick dashed line, reduces the DC voltage output by the battery pack 103 to the required voltage of the charging / discharging port 104.

[0078] Table 1

[0079] Charge closure disconnect Operates according to boost mode logic Discharge closure disconnect Operates according to buck mode logic

[0080] For example, such as Figure 4 As shown, when the voltage of the battery pack 103 is lower than the voltage of the charging / discharging port 104, the main controller can control the power distribution module 102 to connect the second circuit. This allows the boost DC module to step down the DC voltage input from the charging / discharging port 104 to the required voltage of the battery pack 103 through the charging circuit (shown by the thick solid line), thus charging the battery pack 103. Alternatively, the main controller can control the boost DC module to step up the DC voltage output from the battery pack 103 to the required voltage of the charging / discharging port 104 through the discharging circuit (shown by the thick dashed line).

[0081] For example, if the voltage of the battery pack 103 is lower than the voltage of the charging / discharging port 104, the main controller can control the state of each switching element as shown in Table 2. In the charging state, the third switch KA3, the fourth switch KA4, the sixth switch KA6, and the seventh switch KA7 are closed, while the first switch KA1, the second switch KA2, and the fifth switch KA5 are open. Switches Q1 and Q2 operate in buck mode logic. Thus, the boost DC module will... Figure 4 The charging circuit, shown by the thick solid line, steps down the DC voltage input through the charging / discharging port 104 to the required voltage of the battery pack 103. In the discharging state, the third switch KA3, the fourth switch KA4, the sixth switch KA6, and the seventh switch KA7 are closed, while the first switch KA1, the second switch KA2, and the fifth switch KA5 are open. Switches Q1 and Q2 operate in boost mode logic. Thus, the boost DC module will... Figure 4 The discharge circuit, shown by the thick dashed line, boosts the DC voltage output by the battery pack 103 to the required voltage of the charging / discharging port 104.

[0082] Table 2

[0083] Charge closure disconnect Operates according to buck mode logic Discharge closure disconnect Operates according to boost mode logic

[0084] For example, such as Figure 5As shown, when the voltage of the battery pack 103 is equal to the voltage of the charging / discharging port 104, the main controller can control the power distribution module 102 to connect the third circuit to directly connect the battery pack 103 and the charging / discharging port 104. According to the discharge circuit shown by the thick dashed line, the battery pack 103 discharges to the outside through the charging / discharging port 104. According to the charging circuit shown by the thick solid line, the battery pack 103 is charged through the charging / discharging port 104.

[0085] For example, when the voltage of the battery pack 103 is equal to the voltage of the charging / discharging port 104, the main controller controls the states of each switching element as shown in Table 3: the second switch KA2, the fifth switch KA5, the sixth switch KA6, and the seventh switch KA7 are closed; the first switch KA1, the third switch KA3, and the fourth switch KA4 are open; and switching transistors Q1 and Q2 are disconnected. Thus, the battery pack 103 can be operated according to... Figure 5 The discharge circuit shown by the thick line performs DC discharge to the external electrical device connected to the charging / discharging port 104.

[0086] Table 3

[0087] closure disconnect disconnect

[0088] For example, when the voltage of the battery pack 103 is equal to the voltage of the charging / discharging port 104, the main controller controls the states of each switching element as shown in Table 4: the second switch KA2, the fifth switch KA5, the sixth switch KA6, and the seventh switch KA7 are closed; the first switch KA1, the third switch KA3, and the fourth switch KA4 are open; and switching transistors Q1 and Q2 are disconnected. Thus, the external power supply device connected to the charging / discharging port 104 can be used according to... Figure 5 The charging circuit shown by the thick line performs DC charging on the battery pack 103.

[0089] Table 4

[0090] closure disconnect disconnect

[0091] Of course, when the voltage of the battery pack 103 is equal to the voltage of the charging / discharging port 104, the main controller can also control the state of each switching element as follows: the second switch KA2, the third switch KA3, the sixth switch KA6 and the seventh switch KA7 are closed, the first switch KA1, the fourth switch KA4 and the fifth switch KA5 are open, and the switching transistors Q1 and Q2 are open, so as to form a DC charging circuit or a DC charging / discharging circuit.

[0092] In one embodiment, such as Figure 6As shown, the DC charging and discharging equipment also includes a generator module, which is connected in parallel with the boost DC module and the charging and discharging port 104. The generator module is used to generate DC power to obtain DC power voltage, and discharges DC power to external electrical devices through the charging and discharging port 104.

[0093] It should be understood that the generator module 105 can be used to replenish power when the battery pack 103 is discharging, that is, the generator module 105 and the battery pack 103 discharge to the outside simultaneously through the charging and discharging port 104. Alternatively, the generator module 105 can be used alone when the battery pack 103 is not discharging to the outside, that is, the generator module 105 discharges to the outside alone through the charging and discharging port 104. This disclosure does not limit this.

[0094] In one embodiment, such as Figure 6 As shown, the generator module may include a multiphase motor and an engine. The engine is connected to each phase of the multiphase motor. The upper bridge arm of the multiphase motor is connected to the positive terminal of the charging / discharging port 104, and the lower bridge arm of the multiphase motor is connected to the negative terminal of the charging / discharging port 104.

[0095] It should be understood that multiphase motors are three-phase motors, but multiphase motors are not limited to... Figure 6 The three-phase motor shown can also be a five-phase motor, a six-phase motor, etc., and this embodiment does not limit the specific type. In the third operating mode, the engine can drive the motor to perform DC discharge to obtain DC power generation voltage, and then perform DC discharge to the external electrical device connected to the charging / discharging port 104 through the charging / discharging port 104. During this process, the DC power generation voltage does not enter the battery.

[0096] For example, the main controller controls the states of each switching element as shown in Table 5. Switches KA4 and KA7 are closed, while switches KA1, KA2, KA3, KA5, and KA6 are open. Switches Q1 and Q2 are also open. Thus, the generator module 105 can discharge independently through the charging / discharging port 104 to obtain a DC power generation voltage, and... Figure 7 The discharge circuit shown by the thick line performs DC discharge to the external electrical device connected to the charging / discharging port 104 through the charging / discharging port 104.

[0097] Table 5

[0098] closure disconnect disconnect

[0099] For example, when DC power is generated solely through generator module 105 and discharged externally through charging / discharging port 104, if the voltage required by charging / discharging port 104 is higher than the voltage of battery pack 103, the main controller can control the state of each switching element as shown in Table 6. First switch KA1, third switch KA3, fourth switch KA4, and seventh switch KA7 are closed; second switch KA2, fifth switch KA5, and sixth switch KA6 are open; and switching transistors Q1 and Q2 operate according to boost mode logic. Thus, the boost DC module will discharge through... Figure 8 The discharge circuit, shown by the thick solid line, boosts the DC generation voltage output from the engine and multi-phase motor to the required voltage of the charging / discharging port 104. If the required voltage of the charging / discharging port 104 is lower than the voltage of the battery pack 103, the main controller can control the states of each switching element as shown in Table 7. The second switch KA2 and the seventh switch KA7 are closed, while the first switch KA1, the third switch KA3, the fourth switch KA4, the fifth switch KA5, and the sixth switch KA6 are open. Switches Q1 and Q2 operate in buck mode logic. Thus, the boost DC module will... Figure 9 The discharge circuit, shown by the thick solid line, reduces the DC power generation voltage output by the engine and multiphase motor to the required voltage of the charging / discharging port 104.

[0100] Table 6

[0101] disconnect closure Operates according to boost mode logic

[0102] Table 7

[0103] closure disconnect Operates according to buck mode logic

[0104] In one embodiment, the generator module is also connected in parallel with a capacitor module, the two ends of which are respectively connected to the upper and lower bridge arms of the multiphase motor.

[0105] For example, such as Figure 2 As shown, the parallel capacitor module includes capacitor C1, one end of which is connected to the upper bridge arm of the multiphase motor, and the other end is connected to the lower bridge arm of the multiphase motor.

[0106] For example, the DC charging and discharging equipment may further include a working mode switching device, which is connected to the main controller and used to switch the vehicle's working mode. The user can control the working mode switching device to trigger the main controller, which in turn controls the switching of the vehicle's working mode by controlling the on / off states of the seventh switch KA7, the second switch KA2, the fourth switch KA4, the sixth switch KA6, the fifth switch KA5, the third switch KA3, and the first switch KA1. This disclosure does not limit the method of switching the working mode, nor the specific form or operation method of the working mode switching device.

[0107] This disclosure also provides a DC discharge device and a DC charging device, which are used as described above in the DC charging and discharging device. The DC discharge device has a first charging and discharging port, and the DC charging device has a second charging and discharging port. The first charging and discharging port and the second charging and discharging port are connected to each other so that the DC discharge device charges the DC charging device.

[0108] For example, regarding vehicle A and vehicle B, vehicle A can function as a DC discharge device and includes a first charging / discharging port. Vehicle B can function as a DC charging device and includes a second charging / discharging port. The first and second charging / discharging ports are interconnected to enable vehicle A to charge vehicle B. Alternatively, vehicle B can also function as a DC discharge device to charge vehicle A. This disclosure does not limit the specific forms of the DC discharge device, DC charging device, first charging / discharging port, and second charging / discharging port.

[0109] In one embodiment, such as Figure 10 As shown, the DC charging and discharging equipment also includes a connection device 106. The first end of the connection device 106 is connected to the charging and discharging port 104, and the second end of the connection device 106 is connected to an external power device or an external power supply device.

[0110] It should be understood that the connecting device 106 is used to connect the vehicle's charging / discharging port 104 to an external electrical device or external power supply device, so as to realize DC discharge and DC power supply through the vehicle's charging / discharging port 104. The second end of the connecting device 106 may be connected to one or more external electrical devices or external power supply devices, which is not limited in this embodiment.

[0111] This disclosure also provides a vehicle including the aforementioned DC charging and discharging equipment.

[0112] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0113] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0114] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A DC charging and discharging device, characterized in that, Applied to vehicles, it includes a boost DC module, a power distribution module, a battery pack, and a charging / discharging port. The boost DC module includes at least one bridge arm and an induction coil. The battery pack, the boost DC module, and the charging / discharging port are connected in parallel in sequence via a switch circuit. One end of the induction coil is connected to the midpoint of the bridge arm, and the other end is connected to the positive terminal of the battery pack and the positive terminal of the charging / discharging port via the switch circuit. The charging / discharging port is used to connect to an external electrical device or an external power supply device; The power distribution module is used to connect the switching circuit according to the voltage of the battery pack and the voltage of the charging / discharging port to form different connection circuits, so that the battery pack can DC discharge to the external power device or enable the external power supply device to DC charge the battery pack; The connection loop includes: The first circuit includes a connection line connecting the positive terminal of the battery pack to the upper end of the bridge arm, and a connection line connecting the midpoint of the bridge arm to the positive terminal of the charging / discharging port. The second circuit includes a connection line connecting the positive terminal of the battery pack to the midpoint of the bridge arm, and a connection line connecting the upper end of the bridge arm to the positive terminal of the charging / discharging port. The third circuit includes a connection line that connects the positive terminal of the battery pack, the midpoint of the bridge arm, and the positive terminal of the charging / discharging port.

2. The DC charging and discharging device according to claim 1, characterized in that, The switching circuit includes: A first switch disposed between the positive terminal of the battery pack and the upper end of the bridge arm; a second switch disposed between one end of the induction coil and the positive terminal of the charging / discharging port; and A third switch is disposed between the positive terminal of the battery pack and the other end of the induction coil; a fourth switch is disposed between the upper end of the bridge arm and the positive terminal of the charging / discharging port; and The fifth switch in the third circuit is located between the positive terminal of the battery pack and the other end of the induction coil; When the first switch and the second switch are turned on, the first circuit is formed. When the third switch and the fourth switch are turned on, the second circuit is formed. When the fifth switch and the second switch are turned on, the third circuit is formed.

3. The DC charging and discharging device according to claim 2, characterized in that, The first circuit is equipped with a first fuse, the second circuit is equipped with a second fuse and a third fuse, and the third circuit is equipped with a first fuse and a third fuse.

4. The DC charging and discharging device according to claim 3, characterized in that, The third circuit is also equipped with a pre-charge resistor, which is located on the connection line between the fifth switch and the third fuse.

5. The DC charging and discharging device according to claim 2, characterized in that, The switching circuit also includes a sixth switch disposed between the negative terminal of the battery pack and the lower end of the bridge arm, and a seventh switch disposed between the negative terminal of the charging / discharging port and the lower end of the bridge arm; The first circuit, the second circuit, and the third circuit all include connection lines that connect the sixth switch and the seventh switch to connect the negative terminal of the battery pack, the lower end of the bridge arm, and the negative terminal of the charging / discharging port.

6. The DC charging and discharging device according to any one of claims 1-5, characterized in that, It also includes a main controller, which is connected to the boost DC module, the power distribution module, the battery pack, and the charging / discharging port, respectively. The main controller is used for: When the voltage of the battery pack is higher than the voltage of the charging / discharging port, the power distribution module is controlled to connect the first circuit; If the voltage of the battery pack is lower than the voltage of the charging / discharging port, the power distribution module is controlled to connect the second circuit; When the voltage of the battery pack is equal to the required voltage of the charging / discharging port, the power distribution module is controlled to connect the third circuit.

7. The DC charging and discharging device according to claim 6, characterized in that, It also includes a generator module, which is connected in parallel with the boost DC module and the charging / discharging port. The generator module is used to generate DC power to obtain DC power voltage, and to discharge DC power to the external electrical device through the charging and discharging port.

8. The DC charging and discharging device according to claim 7, characterized in that, The generator module includes a multi-phase motor and an engine, and the engine is connected to each phase of the multi-phase motor. The upper bridge arm of the multiphase motor is connected to the positive terminal of the charging / discharging port; The lower bridge arm of the multiphase motor is connected to the negative terminal of the charging / discharging port.

9. The DC charging and discharging device according to claim 8, characterized in that, The generator module is also connected in parallel with a capacitor module, the two ends of which are respectively connected to the upper and lower bridge arms of the multiphase motor.

10. A DC charging and discharging system, characterized in that, include: A DC discharge device and a DC charging device, wherein the DC discharge device and the DC charging device are based on the DC charging and discharging device as described in any one of claims 1-9. The DC discharge device has a first charging / discharging port, and the DC charging device has a second charging / discharging port. The first charging / discharging port and the second charging / discharging port are connected to each other so that the DC discharge device can charge the DC charging device.

11. The DC charging and discharging system according to claim 10, characterized in that, The DC charging and discharging equipment also includes a connecting device, the first end of which is connected to the first charging and discharging port, and the second end of which is connected to the second charging and discharging port.

12. A vehicle, characterized in that, Includes the DC charging and discharging device according to any one of claims 1-9.

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