A charging and discharging circuit, a charging method, a charging and discharging system, and a vehicle

Abstract

The application relates to a charging and discharging circuit, a charging method, a charging and discharging system and a vehicle, and relates to the technical field of electric vehicle charging. At least the technical problem that, in the related art, the charging pile charges the battery through a boosting loop, which causes loss to the power device of the vehicle, affects the charging power, and further affects the charging efficiency. The application comprises a battery pack and a charging port. The battery pack comprises a first battery group and a second battery group. The charging port is coupled to the battery pack and is configured to charge the first battery group or the second battery group through a charging voltage of the charging port, wherein the charging voltage is greater than any one of the rated working voltage of the first battery group and the rated working voltage of the second battery group.

Description

Technical Field

[0001] This application relates to the field of electric vehicle charging technology, specifically to a charging and discharging circuit, a charging method, a charging and discharging system, and a vehicle. Background Technology

[0002] With the rapid development of the new energy vehicle industry, the short driving range and inconvenient charging of electric vehicles have become major problems in the transformation to electric vehicles. To solve this problem, improving battery energy density, charging rate, and voltage platform has become a technological development trend. When a vehicle is charged by DC, the output voltage of the charging equipment needs to be higher than the voltage of the vehicle's battery pack. Therefore, achieving high-rate charging requires the use of dedicated high-power charging piles (e.g., 1000V charging piles), while a large number of low-voltage platform charging piles (e.g., 500V charging piles) still exist in the market.

[0003] In related technologies, low-voltage platform charging piles can charge the batteries of vehicles equipped with high-power voltage platforms through a boost circuit, thereby solving the problem of compatibility between high-power voltage platform vehicles and low-voltage platform charging piles.

[0004] However, in related technologies, charging piles charge batteries through a boost circuit, which causes losses to the vehicle's power devices, affecting charging power and thus charging efficiency. Summary of the Invention

[0005] This application provides a charging and discharging circuit, a charging method, a charging and discharging system, and a vehicle. The purpose of this application is to at least solve the technical problem in the related art that charging piles charging batteries through a boost circuit will cause losses to the vehicle's power devices, affecting the charging power and thus the charging efficiency.

[0006] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0007] According to a first aspect of this application, a charging and discharging circuit is provided, comprising: a battery pack, including a first battery group and a second battery group; a charging port coupled to the battery pack; and a circuit configured to charge either the first battery group or the second battery group by inputting a charging voltage to the charging port. The charging voltage is greater than either the rated operating voltage of the first battery group or the rated operating voltage of the second battery group. The charging and discharging circuit further comprises an electric drive assembly, the input port of which is coupled to the battery pack and the charging port, and the output port of which is coupled to an electrical device. The circuit is configured to boost the first voltage input to the input port of the electric drive assembly and output a second voltage, which is greater than the first voltage, from the output port of the electric drive assembly. The electrical device includes at least one of the following: a direct current-direct current (DCDC) converter, an air conditioning pack (ACP), and a positive temperature coefficient thermistor. Coefficient (PTC); The electric drive assembly includes: a multi-phase bridge arm and multiple coils; the first end of the multi-phase bridge arm is coupled to the positive terminal of the first battery pack and the positive terminal of the charging port, respectively; the second end of the multi-phase bridge arm is coupled to the negative terminal of the second battery pack and the negative terminal of the charging port, respectively; the midpoint of the multi-phase bridge arm is connected to the first end of the multiple coils, and the midpoint of the bridge arm is the connection end of the upper half bridge and the lower half bridge of the bridge arm; the second ends of the multiple coils are connected; after the second voltage is output at the first end of the multi-phase bridge arm, the charging port is configured to charge the first battery pack or the second battery pack.

[0008] According to the above-mentioned technical means, in the charging and discharging circuit provided in this application, when the charging voltage provided by the external power supply at the charging port is greater than either the rated operating voltage of the first battery pack or the rated operating voltage of the second battery pack, the external power supply can charge the first battery pack or the second battery pack through the charging port. Compared with the prior art, when the external power supply can charge the battery pack through the charging port, it is not necessary to go through a boost circuit to directly charge the battery pack, reducing damage to power devices and improving charging efficiency. Since the DC-DC converter in the electrical equipment can adjust the output voltage to provide stable low-voltage DC power to low-voltage devices, and ACP and PTC can ensure that the battery is in a suitable temperature range, ensuring battery performance and charging and discharging power, it is necessary to ensure the normal operation of the electrical equipment before the external power supply charges the battery pack through the power port. Furthermore, because the charging and discharging circuit provides a first voltage at the charging port or the voltage across the battery pack, while the electrical device requires a second voltage, the charging voltage provided at the charging port or the voltage across the battery pack does not match the voltage across the electrical device. Therefore, the first voltage at the input port of the input drive component is boosted to obtain the voltage required by the electrical device so as to supply power to the electrical device.

[0009] In one possible implementation, the battery pack further includes: a first branch and a first switch connected to the first branch, a first end of the first branch coupled to the negative terminal of the first battery pack, and a second end of the first branch coupled to the positive terminal of the second battery pack. When the charging voltage is greater than either the rated operating voltage of the first battery pack or the rated operating voltage of the second battery pack, the first switch is configured to be open, and the charging port is configured such that the positive terminal of the charging port is coupled to the positive terminal of the first battery pack, and the negative terminal of the charging port is coupled to the negative terminal of the first battery pack, for charging the first battery pack. Alternatively, the charging port is configured such that the positive terminal of the charging port is coupled to the positive terminal of the second battery pack, and the negative terminal of the charging port is coupled to the negative terminal of the second battery pack, for charging the second battery pack.

[0010] According to the above-mentioned technical means, in the charging and discharging circuit provided in this application, the first battery pack and the second battery pack can be connected in parallel. When the charging voltage provided by the external power source at the charging port is not compatible with the voltage across the battery pack when the first and second battery packs are connected in series, the first and second battery packs can be connected in parallel. That is, the first switch connected between the first and second battery packs is configured to be open. In this way, the external power source can charge either the first or second battery pack through the charging port.

[0011] In one possible implementation, the battery pack further includes a second branch and a second switch connected to the second branch. A first end of the second branch is coupled to the negative terminal of the charging port, and a second end of the second branch is coupled to the negative terminal of the first battery pack. When charging the first battery pack, the second switch is configured to be turned on when the charging voltage is greater than either the rated operating voltage of the first battery pack or the rated operating voltage of the second battery pack.

[0012] According to the aforementioned technical means, when an external power source charges the first battery pack through the charging port, the second switch connected between the positive terminal of the charging port and the negative terminal of the first battery pack is configured to be turned on. In this way, the external power source can charge the first battery pack through the charging port.

[0013] In one possible implementation, the battery pack further includes: a third branch and a third switch connected to the third branch. A first end of the third branch is coupled to the positive terminal of the charging port, and a second end of the third branch is coupled to the positive terminal of the second battery pack. A fourth branch and a fourth switch connected to the fourth branch. A first end of the fourth branch is coupled to the negative terminal of the charging port, and a second end of the fourth branch is coupled to the negative terminal of the second battery pack. When charging the second battery pack with a charging voltage greater than either the rated operating voltage of the first battery pack or the rated operating voltage of the second battery pack, the third and fourth switches are configured to be on.

[0014] According to the above technical means, when an external power source charges the second battery pack through the charging port, the third switch connected between the positive terminal of the charging port and the positive terminal of the second battery pack is configured to be on, and the fourth switch connected between the negative terminal of the charging port and the negative terminal of the second battery pack is configured to be on. In this way, the second battery pack and the charging port can form a charging circuit, allowing the external power source to charge the second battery pack through the charging port.

[0015] In one possible implementation, the battery pack further includes a fifth branch and a fifth switch connected to the fifth branch. A first terminal of the fifth branch is coupled to the negative terminal of the second battery pack, and a second terminal of the fifth branch is coupled to the first terminal of the fourth branch. When the second battery pack is being charged at a charging voltage greater than either the rated operating voltage of the first battery pack or the rated operating voltage of the second battery pack, the fifth switch is configured to be turned on.

[0016] According to the aforementioned technical means, when a fourth switch and a fifth switch exist between the negative terminal of the charging port and the negative terminal of the second battery pack, both the fourth switch and the fifth switch connected between the negative terminal of the charging port and the negative terminal of the second battery pack are configured to be on. In this way, the second battery pack and the charging port can form a charging circuit, allowing an external power source to charge the second battery pack through the charging port.

[0017] In one possible implementation, the battery pack further includes: a first branch and a first switch connected to the first branch, a first end of the first branch being coupled to the negative terminal of the first battery pack, and a second end of the first branch being coupled to the positive terminal of the second battery pack. When the charging voltage is greater than the sum of the rated operating voltages of the first and second battery packs, the first switch is configured to be turned on, and the charging port is further configured such that the positive terminal of the charging port is coupled to the positive terminal of the first battery pack, and the negative terminal of the charging port is coupled to the negative terminal of the second battery pack, thereby charging the series-connected first and second battery packs.

[0018] According to the aforementioned technical means, the first and second battery packs within the battery pack can be connected in series. When the charging voltage provided by the external power source at the charging port matches the voltage across the battery pack when the first and second battery packs are connected in series, the first and second battery packs can be connected in series. That is, the first switch connected between the first and second battery packs is configured to be on. In this way, the external power source can charge the series-connected first and second battery packs through the charging port.

[0019] In one possible implementation, the battery pack further includes a sixth branch and a sixth switch connected to the sixth branch. A first end of the sixth branch is coupled to the positive terminal of the first battery pack, and a second end of the sixth branch is coupled to the first end of the multiphase bridge arm. When the charging voltage is greater than the sum of the rated operating voltages of the first and second battery packs, the first switch is configured to be on, the sixth switch is configured to be on, and the charging port is further configured such that its positive terminal is coupled to the positive terminal of the first battery pack, and its negative terminal is coupled to the negative terminal of the second battery pack, charging the series-connected first and second battery packs, and discharging externally through the first and second ends of the multiphase bridge arm.

[0020] According to the aforementioned technical means, in the electric drive assembly, the first end of the multi-phase bridge arm is coupled to the positive terminal of the first battery pack and the positive terminal of the charging port, respectively, and the second end of the multi-phase bridge arm is coupled to the negative terminal of the second battery pack and the negative terminal of the charging port, respectively. The midpoint of the multi-phase bridge arm is connected to the first end of multiple coils, and the midpoint of the bridge arm is the connection end of the upper and lower half-bridges of the bridge arm. When the charging voltage is greater than the sum of the rated operating voltages of the first and second battery packs, it is not necessary to boost the voltage through the electric drive assembly. Therefore, the voltage provided at the charging port can be directly discharged to the outside through the first and second ends of the multi-phase bridge arm. In addition, the charging voltage provided at the charging port charges the first and second battery packs connected in series.

[0021] In one possible implementation, the battery pack further includes a seventh branch and a seventh switch connected to the seventh branch. The first end of the seventh branch is coupled to the positive terminal of the first battery pack, and the second end of the seventh branch is coupled to the second ends of a plurality of coils. When the charging voltage is greater than either the rated operating voltage of the first battery pack or the rated operating voltage of the second battery pack, the sixth switch is configured to open, the seventh switch is configured to close, and the lower half of the multiphase bridge arm is configured to conduct along the midpoint of the bridge arm towards the second end of the bridge arm, so that the battery pack or charging port charges the plurality of coils. After charging the plurality of coils for a preset time, the lower half of the multiphase bridge arm is configured to close along the midpoint of the bridge arm towards the second end of the bridge arm, and the upper half of the multiphase bridge arm is configured to conduct along the midpoint of the bridge arm towards the first end of the bridge arm, to boost the first voltage input to the second ends of the plurality of coils, and output a second voltage from the first end of the multiphase bridge arm.

[0022] According to the aforementioned technical means, when the charging voltage provided by the charging port or the voltage across the battery pack cannot meet the voltage requirements of the electrical equipment, it is necessary to boost the first voltage at the second terminals of the multiple coils via an electric drive assembly. Therefore, a seventh switch connected between the second terminals of the multiple coils and the positive terminal of the first battery pack needs to be closed. In this way, the first voltage output from the first battery pack, or the first voltage output from the second battery pack, or the first voltage provided by the charging port, can flow through the seventh switch to the multiple coils to boost the first voltage at the second terminals of the multiple coils, and the second voltage is output from the first terminal of the multi-phase bridge arm. This allows power to be supplied to the electrical equipment.

[0023] In one possible implementation, the battery pack further includes: an eighth branch and an eighth switch connected to the eighth branch, the first end of the eighth branch being coupled to the positive terminal of the first battery pack, and the second end of the eighth branch being coupled to the first ends of the sixth branch and the seventh branch, respectively. A ninth branch, a ninth switch connected to the ninth branch, and a current damping device are also included, the first end of the ninth branch being coupled to the positive terminal of the first battery pack, and the second end of the ninth branch being coupled to the first ends of the sixth branch and the seventh branch, respectively. When the battery pack discharges externally, the ninth switch is configured to turn on before the eighth switch turns on.

[0024] Based on the aforementioned technical means, a large current is generated the instant the battery pack supplies power to the electrical equipment. To prevent damage to the equipment from this large current, the ninth switch must be closed before the eighth switch is closed. In this way, the current damping device in the ninth branch can buffer the current and protect the electrical equipment.

[0025] According to a second aspect of this application, a charging and discharging circuit is provided, comprising: a battery pack, including a first battery group and a second battery group; and a charging port coupled to the battery pack, configured to charge the first battery group and the second battery group by means of a charging voltage provided by the charging port, wherein the first battery group and the second battery group are connected in parallel. The charging voltage is greater than either the rated operating voltage of the first battery group or the rated operating voltage of the second battery group.

[0026] According to the above-mentioned technical means, when the charging voltage is greater than either the rated operating voltage of the first battery pack or the rated operating voltage of the second battery pack, an external power source can charge the first and second battery packs connected in parallel through the charging port. Compared with the prior art, when an external power source can charge the battery pack through the charging port, it is not necessary to go through a boost circuit; the battery packs inside the battery pack are charged directly, reducing damage to power devices and improving charging efficiency.

[0027] According to a third aspect provided in this application, a charging method is provided, comprising: obtaining a charging voltage and charging a first battery pack or a second battery pack using the charging voltage. The charging voltage is greater than either the rated operating voltage of the first battery pack or the rated operating voltage of the second battery pack. The charging and discharging circuit also includes an electric drive assembly, the input port of which is coupled to the battery pack and the charging port, and the output port of which is coupled to the electrical device. The circuit is configured to boost the first voltage at the input port of the electric drive assembly and output a second voltage at the output port of the electric drive assembly, the second voltage being greater than the first voltage. The electrical device includes at least one of the following: DC-DC, ACP, and PTC. The electric drive assembly includes a multi-phase bridge arm and multiple coils. The first end of the multi-phase bridge arm is coupled to the positive terminal of the first battery pack and the positive terminal of the charging port, the second end of the multi-phase bridge arm is coupled to the negative terminal of the second battery pack and the negative terminal of the charging port, the midpoint of the multi-phase bridge arm is connected to the first end of the multiple coils, and the midpoint of the bridge arm is the connection end of the upper half-bridge and the lower half-bridge of the bridge arm. The second ends of the multiple coils are connected. After the second voltage is output at the first end of the multi-phase bridge arm, the charging port is configured to charge either the first battery pack or the second battery pack.

[0028] In one possible implementation, the method further includes charging the first and second battery packs connected in series when the charging voltage is greater than the sum of the rated operating voltages of the first and second battery packs.

[0029] According to the fourth aspect provided in this application, a charging method is provided, comprising: obtaining a charging voltage, charging a first battery pack and a second battery pack using the charging voltage, wherein the first battery pack and the second battery pack are connected in parallel. The charging voltage is greater than either the rated operating voltage of the first battery pack or the rated operating voltage of the second battery pack. The charging and discharging circuit also includes an electric drive assembly, the input port of which is coupled to the battery pack and the charging port, and the output port of which is coupled to the electrical device. The circuit is configured to boost the first voltage at the input port of the electric drive assembly and output a second voltage at the output port of the electric drive assembly, the second voltage being greater than the first voltage. The electrical device includes at least one of the following: DC-DC, ACP, and PTC. The electric drive assembly includes a multi-phase bridge arm and multiple coils. The first end of the multi-phase bridge arm is coupled to the positive terminal of the first battery pack and the positive terminal of the charging port, the second end of the multi-phase bridge arm is coupled to the negative terminal of the second battery pack and the negative terminal of the charging port, the midpoint of the multi-phase bridge arm is connected to the first end of the multiple coils, and the midpoint of the bridge arm is the connection end of the upper half-bridge and the lower half-bridge of the bridge arm. The second ends of the multiple coils are connected. After the second voltage is output at the first end of the multi-phase bridge arm, the charging port is configured to charge either the first battery pack or the second battery pack.

[0030] According to a fifth aspect of this application, a charging and discharging system is provided, comprising: a charging and discharging circuit and a controller as described in the first or second aspect. The controller is configured to perform a charging method as described in the third or fourth aspect.

[0031] According to a sixth aspect provided in this application, a vehicle is provided, including the charging and discharging circuit described in the first or second aspect; and / or, the charging and discharging system described in the fifth aspect.

[0032] According to the seventh aspect provided in this application, a computer-readable storage medium is provided, the computer-readable storage medium including computer-executable instructions, which, when executed on a controller, cause the controller to perform the charging method described in the third or fourth aspect.

[0033] According to the eighth aspect provided in this application, a computer program product is provided, the computer program product including a computer program or instructions that, when the computer instructions are executed on a controller, cause the controller to perform the charging method as described in the third or fourth aspect above.

[0034] It should be noted that the technical effects of any of the implementation methods in aspects two through eight can be found in the technical effects of the corresponding implementation methods in aspect one, and will not be repeated here.

[0035] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0036] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application, and do not constitute an undue limitation of this application.

[0037] Figure 1 This is a schematic diagram of a charging and discharging system according to an exemplary embodiment;

[0038] Figure 2 This is a schematic diagram of a charging and discharging circuit according to an exemplary embodiment;

[0039] Figure 3 This is a schematic diagram of yet another charging and discharging circuit according to an exemplary embodiment;

[0040] Figure 4 It is based on Figure 3 The diagram shows the current flow of a charging and discharging circuit.

[0041] Figure 5 This is a schematic diagram of a charging and discharging circuit in the first stage according to an exemplary embodiment;

[0042] Figure 6 This is a schematic diagram of another charging and discharging circuit in the first stage according to an exemplary embodiment;

[0043] Figure 7 This is a schematic diagram of another charging and discharging circuit in the first stage according to an exemplary embodiment;

[0044] Figure 8 This is a schematic diagram of another charging and discharging circuit in the first stage according to an exemplary embodiment;

[0045] Figure 9 This is a schematic diagram of a charging and discharging circuit in the second stage according to an exemplary embodiment;

[0046] Figure 10 It is based on Figure 5 or Figure 8 The diagram shows a charging and discharging circuit in the third stage.

[0047] Figure 11 It is based on Figure 6 The diagram shows a charging and discharging circuit in the third stage.

[0048] Figure 12 It is based on Figure 7 The diagram shows a charging and discharging circuit in the third stage.

[0049] Figure 13This is a schematic flowchart illustrating a charging method according to an exemplary embodiment;

[0050] Figure 14 This is a schematic flowchart illustrating yet another charging method according to an exemplary embodiment;

[0051] Figure 15 This is a schematic flowchart illustrating another charging method according to an exemplary embodiment.

[0052] Figure label:

[0053] B1, First battery pack; B2, Second battery pack;

[0054] K1, First switch; K2, Second switch; K3, Third switch; K4, Fourth switch; K5, Fifth switch; K6, Sixth switch; K7, Seventh switch; K8, Eighth switch; K9, Ninth switch; K10, Tenth switch;

[0055] R, current damping device;

[0056] VT1, first switching transistor; VT2, second switching transistor; VT3, third switching transistor; VT4, fourth switching transistor; VT5, fifth switching transistor; VT6, second switching transistor;

[0057] VD1, first diode; VD2, second diode; VD3, third diode; VD4, fourth diode; VD5, fifth diode; VD6, sixth diode;

[0058] L1, first winding coil; L2, second winding coil; L3, third winding coil;

[0059] C. Capacitors. Detailed Implementation

[0060] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0061] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0062] To facilitate a clear description of the technical solutions of the embodiments of this application, the terms "first" and "second" are used in the embodiments of this application to distinguish the same or similar items with essentially the same function and effect. Those skilled in the art can understand that the terms "first" and "second" are not intended to limit the quantity or execution order.

[0063] To enable those skilled in the art to better understand the technical solutions of this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0064] In some embodiments, the vehicle includes a charging / discharging system and electrical equipment. The charging / discharging system is connected to the electrical equipment and provides electrical power to the electrically connected equipment.

[0065] The charging and discharging system can connect to a charging station to obtain electrical energy from it. The electrical energy obtained from the charging station can be used to charge the battery pack or to power electrical devices.

[0066] Electrical equipment may include, but is not limited to, high-voltage devices (such as DC-DC converters, ACP and PTC) and low-voltage devices.

[0067] In electrical equipment, high-voltage devices can be directly connected to the charging and discharging system, while low-voltage devices are connected to the charging and discharging system through high-voltage devices.

[0068] In high-voltage devices, DC-DC converters can adjust the output voltage to provide stable low-voltage DC power to low-voltage devices.

[0069] ACP and PTC can ensure that the battery is in a suitable temperature range, thus guaranteeing battery performance and charging / discharging power.

[0070] Specifically, the ACP can absorb heat from the external environment or vehicle waste heat and transfer it to the battery to raise its temperature. The ACP can also cool the battery through a cooling cycle to ensure that the battery operates at a suitable temperature.

[0071] PTCs can directly heat the battery through their own heat generation, raising the battery temperature and ensuring that the battery operates at a suitable temperature.

[0072] Understandably, before a charging station can charge the battery, it must be ensured that the battery is operating at a suitable temperature and that some low-voltage components in the vehicle are functioning normally. Therefore, before a charging station can charge the battery, it must be ensured that the electrical equipment in the vehicle is functioning normally.

[0073] A schematic diagram of a charging and discharging system according to an exemplary embodiment is shown below. Figure 1 As shown, the charging and discharging system 1 includes a controller 10 and a charging and discharging circuit 20.

[0074] The controller 10 is connected to the charging and discharging circuit 20.

[0075] The controller 10 controls the charging and discharging in the charging and discharging circuit 20 by controlling the switching elements in the charging and discharging circuit 20.

[0076] The charging and discharging circuit 20 responds to the control of the controller 10 to charge or discharge the battery in the charging and discharging circuit 20.

[0077] Specifically, such as Figure 2 As shown, the charging and discharging circuit 20 includes: a battery pack 201, an electric drive assembly 202, a charging port 203, and a discharging port 204.

[0078] The charging port 203 is coupled to the battery pack 201.

[0079] Discharge port 204 is used for coupling electrical equipment.

[0080] The input port of the electric drive assembly 202 is coupled to the battery pack 201 and the charging port 203, respectively, and the output port of the electric drive assembly is coupled to the discharging port 204.

[0081] Specifically, the electric drive assembly 202 is coupled to the electrical equipment through the discharge port 204.

[0082] The battery pack 201 is used to store electrical energy and can supply power to electrical devices through the electric drive assembly 202 and the discharge port 204.

[0083] The battery pack 201 can also obtain electrical energy through the charging port 203 to store electrical energy.

[0084] For example, when an external power source is connected to the charging port 203, the external power source (e.g., a charging pile) charges the battery pack 201 and / or supplies power to the electrical device through the charging port 203.

[0085] The battery pack 201 includes: a first battery pack B1, a second battery pack B2, a first switch K1, a second switch K2, a third switch K3, a fourth switch K4, a fifth switch K5, a sixth switch K6, a seventh switch K7, an eighth switch K8, a ninth switch K9, a tenth switch K10, and a current damping device R (such as a resistor).

[0086] Specifically, the capacity difference between the first battery pack B1 and the second battery pack B2 is less than a preset threshold. The smaller the preset threshold, the smaller the capacity difference between the first battery pack B1 and the second battery pack B2. The capacities of the first battery pack B1 and the second battery pack B2 can be the same.

[0087] The first switch K1, the second switch K2, the third switch K3, the fourth switch K4, the fifth switch K5, the sixth switch K6, the seventh switch K7, the eighth switch K8, the ninth switch K9, and the tenth switch K10 can be relays.

[0088] The electric drive assembly 202 includes: a multiphase bridge arm 2021, multiple coils 2022 and a capacitor C.

[0089] The first end of the multiphase bridge arm 2021 is coupled to the positive terminal of the first battery pack B1 and the positive terminal of the charging port 203, respectively, and the second end of the multiphase bridge arm 2021 is coupled to the negative terminal of the second battery pack B2 and the negative terminal of the charging port 203, respectively.

[0090] The midpoints of the multiphase bridge arm 2021 are respectively connected to the first ends of multiple coils 2022, and the midpoints of the bridge arm are the connection ends of the upper and lower half bridges of the bridge arm.

[0091] The second ends of multiple coils 2022 are connected.

[0092] The upper half of the bridge arm includes a first switch VT1 and a first diode VD1 connected in parallel, a second switch VT2 and a second diode VD2 connected in parallel, and a third switch VT3 and a third diode VD3 connected in parallel.

[0093] The lower half of the bridge arm includes a fourth switch VT4 and a fourth diode VD4 connected in parallel, a fifth switch VT5 and a fifth diode VD5 connected in parallel, and a sixth switch VT6 and a sixth diode VD6 connected in parallel.

[0094] The multiple coils 2022 include: a first winding coil L1, a second winding coil L2, and a third winding coil L3.

[0095] Taking the multiphase bridge arm 2021, which includes a three-phase bridge arm (i.e., a three-phase inverter), and the multiple coils 2022, which include three winding coils (i.e., three-phase stator windings), as an example.

[0096] like Figure 2 As shown, the multiphase bridge arm 2021 includes: a first bridge arm, a second bridge arm, and a third bridge arm.

[0097] The first bridge arm includes: a first switch VT1, a first diode VD1, a fourth switch VT4, and a fourth diode VD4. The first switch VT1 and the first diode VD1 are connected in parallel, and the fourth switch VT4 and the fourth diode VD4 are connected in parallel. The first end of the first winding coil L1 is connected between the first switch VT1 and the fourth switch VT4.

[0098] The second bridge arm includes: a second switch VT2, a second diode VD2, a fifth switch VT5, and a fifth diode VD5. The second switch VT2 and the second diode VD2 are connected in parallel, and the fifth switch VT5 and the fifth diode VD5 are connected in parallel. The first end of the second winding coil L2 is connected between the second switch VT2 and the fifth switch VT5.

[0099] The third bridge arm includes: a third switch VT3, a third diode VD3, a sixth switch VT6, and a sixth diode VD6. The third switch VT3 and the third diode VD3 are connected in parallel, and the sixth switch VT6 and the sixth diode VD6 are connected in parallel. The first end of the third winding coil L3 is connected between the third switch VT3 and the sixth switch VT6.

[0100] By controlling the switching on and off of the transistors and diodes in the upper half-bridge, the midpoint of the bridge arm can be controlled to conduct towards the first end of the bridge arm. By controlling the switching on and off of the transistors and diodes in the lower half-bridge, the midpoint of the bridge arm can be controlled to conduct towards the second end of the bridge arm.

[0101] For example, the controller is electrically connected to the control terminals of multiple switching elements in the multiphase bridge arm 2021. The conduction direction of the bridge arm can be controlled by controlling the switching transistors and diodes. When the upper half-bridge's switching transistors are on and the upper half-bridge's diodes are off, the first end of the bridge arm conducts towards the midpoint of the bridge arm. When the upper half-bridge's switching transistors are off and the upper half-bridge's diodes are on, the midpoint of the bridge arm conducts towards the first end of the bridge arm. Correspondingly, when the lower half-bridge's switching transistors are on and the lower half-bridge's diodes are off, the midpoint of the bridge arm conducts towards the second end of the bridge arm. When the lower half-bridge's switching transistors are off and the lower half-bridge's diodes are on, the second end of the bridge arm conducts towards the midpoint of the bridge arm.

[0102] The first switch K1 is connected to the first branch, the second switch K2 is connected to the second branch, the third switch K3 is connected to the third branch, the fourth switch K4 is connected to the fourth branch, the fifth switch K5 is connected to the fifth branch, the sixth switch K6 is connected to the sixth branch, the seventh switch K7 is connected to the seventh branch, the eighth switch K8 is connected to the eighth branch, the ninth switch K9 and the current damping device R are connected to the ninth branch, and the tenth switch K10 is connected to the tenth branch.

[0103] The first end of the first branch is coupled to the negative terminal of the first battery pack B1, and the second end of the first branch is coupled to the positive terminal of the second battery pack B2.

[0104] The first end of the second branch is coupled to the negative terminal of the charging port 203, and the second end of the second branch is coupled to the negative terminal of the first battery pack B1.

[0105] The first end of the third branch is coupled to the positive terminal of the charging port 203 via the tenth branch, and the second end of the third branch is coupled to the positive terminal of the second battery pack B2.

[0106] The first end of the fourth branch is coupled to the negative terminal of the charging port 203, and the second end of the fourth branch is coupled to the negative terminal of the second battery pack B2 through the fifth switch K5.

[0107] The first end of the fifth branch is coupled to the negative terminal of the second battery pack B2, and the second end of the fifth branch is coupled to the first end of the fourth branch.

[0108] The first end of the sixth branch is coupled to the positive terminal of the first battery pack B1, and the second end of the sixth branch is coupled to the first end of the multiphase bridge arm 2021.

[0109] Optionally, the first end of the sixth branch is coupled to the positive terminal of the charging port 203 via the tenth branch.

[0110] The first end of the seventh branch is coupled to the positive terminal of the first battery pack B1 via the eighth or ninth branch, and the second end of the seventh branch is coupled to the second end of the multiple coils 2022.

[0111] The first end of the eighth branch is coupled to the positive terminal of the first battery pack B1, and the second end of the eighth branch is coupled to the first end of the sixth branch and the first end of the seventh branch, respectively.

[0112] The first end of the ninth branch is coupled to the positive terminal of the first battery pack B1, and the second end of the ninth branch is coupled to the first end of the sixth branch and the first end of the seventh branch, respectively.

[0113] The first end of capacitor C is coupled to the first end of multiphase bridge arm 2021, and the second end of capacitor C is coupled to the second end of multiphase bridge arm 2021.

[0114] When an external power source is connected to the charging port 203, the external power source charges the battery pack 201 and supplies power to the electrical device through the discharge port 204.

[0115] The following explanation addresses the different charging voltage ranges provided by charging port 203.

[0116] In some embodiments, the charging voltage provided by the charging port 203 is greater than the sum of the rated operating voltage of the first battery pack and the rated operating voltage of the second battery pack B2.

[0117] For example, taking the charging pile charging the battery pack as an example, the rated voltage of the first battery pack B1 is 400V, the rated voltage of the second battery pack B2 is 400V, the voltage required for the normal operation of the electrical equipment is 800V, and the charging voltage of the charging pile through the charging port 203 is 800V.

[0118] In this configuration, the charging voltage provided by the charging pile at charging port 203 can be adapted to the voltage across battery pack 201 when the first battery pack B1 and the second battery pack B2 are connected in series, and can also be adapted to the voltage across the electrical equipment. At this time, the first switch K1, the fourth switch K4, the fifth switch K5, the sixth switch K6, the eighth switch K8, and the tenth switch K10 are all configured to be on, that is, the first switch K1, the fourth switch K4, the fifth switch K5, the sixth switch K6, the eighth switch K8, and the tenth switch K10 are closed, while the other switches are open.

[0119] like Figure 3 As shown, the positive terminal of charging port 203 is coupled to the positive terminal of the first battery pack B1 via the tenth switch K10 and the eighth switch K8. The negative terminal of charging port 203 is coupled to the negative terminal of the second battery pack B2 via the fourth switch K4 and the fifth switch K5. The charging pile charges the first battery pack B1 and the second battery pack B2 connected in series through charging port 203.

[0120] The positive terminal of the charging port 203 is coupled to the first terminal of the discharging port 204 through the sixth switch K6 and the first terminal of the multiphase bridge arm 2021. The positive terminal of the charging port 203 is coupled to the second terminal of the discharging port 204 through the fourth switch K4 and the second terminal of the multiphase bridge arm 2021, so as to discharge to the outside through the discharging port 204, that is, to supply power to the electrical equipment.

[0121] Specifically, the direction of current flow is as follows: Figure 4 As shown.

[0122] In some embodiments, the charging voltage provided by the charging port 203 is greater than either the rated operating voltage of the first battery pack B1 or the rated operating voltage of the second battery pack B2.

[0123] For example, taking the charging pile charging the battery pack as an example, the rated voltage of the first battery pack B1 is 400V, the rated voltage of the second battery pack B2 is 400V, the voltage required for the normal operation of the electrical equipment is 800V, and the charging voltage of the charging pile through the charging port 203 is 500V.

[0124] In this case, the charging voltage provided by the charging pile at the charging port 203 cannot be adapted to the voltage across the battery pack 201 when the first battery pack B1 and the second battery pack B2 are connected in series, nor can it be adapted to the voltage across the electrical equipment. However, it can be adapted to the voltage across the battery pack 201 when the first battery pack B1 and the second battery pack B2 are connected in parallel.

[0125] In the battery pack 201, during the short period of time when the first battery group B1 and the second battery group B2 switch from series connection to parallel connection, the battery pack 201 cannot supply power to the electrical equipment through the discharge port 204.

[0126] Before connecting the charging port 203 to an external power source, it is necessary to ensure that the electrical equipment is working properly.

[0127] In this embodiment, the operation of the charging and discharging circuit 20 is first divided into three stages. In the first stage, the battery pack 201 or an external power source charges multiple coils 2022 (including a first winding coil L1, a second winding coil L2, and a third winding coil L3) through the charging port 203. After a preset charging time for the multiple coils, the second stage begins, where the battery pack 201 or the external power source boosts the voltage through the multiple coils 2022 via the charging port 203. At this time, the boosted voltage is adapted to the voltage across the electrical device to ensure normal operation. Next, after the electrical device is operating normally, the third stage begins, where the external power source charges the first battery pack B1 and / or the second battery pack B2 through the charging port, and boosts the voltage through the multiple coils 2022 to discharge through the discharging port 204, thus supplying power to the electrical device.

[0128] Phase 1 Figure 5 As shown in (a), the second switch K2, the third switch K3, the fourth switch K4, the fifth switch K5, the seventh switch K7 and the eighth switch K8 are all configured to be on, that is, the second switch K2, the third switch K3, the fourth switch K4, the fifth switch K5, the seventh switch K7 and the eighth switch K8 are closed, and the first switch K1, the sixth switch K6, the ninth switch K9 and the tenth switch K10 are open.

[0129] In this case, the fourth switch VT4, the fifth switch VT5, and the sixth switch VT6 are all configured to be turned on, that is, the lower half of the multiphase bridge arm is configured to be turned on along the direction from the midpoint of the bridge arm to the second end of the bridge arm.

[0130] like Figure 5 As shown in (a), the positive terminal of the first battery pack B1 is coupled to the second terminal of multiple coils 2022 via the eighth switch K8 and the seventh switch K7. The negative terminal of the first battery pack B1 is coupled to the second terminal of the multiphase bridge arm 2021 via the second switch K2 and the fourth switch K4. In this way, the first battery pack B1 charges the multiple coils 2022.

[0131] The positive terminal of the second battery pack B2 is coupled to the second end of multiple coils 2022 via the third switch K3 and the seventh switch K7. The negative terminal of the second battery pack B2 is coupled to the second end of the multiphase bridge arm 2021 via the fifth switch K5. In this way, the second battery pack B2 charges the multiple coils 2022.

[0132] Specifically, the direction of current flow is as follows: Figure 5 As shown in (b).

[0133] In other embodiments, the first stage is as follows: Figure 6 As shown in (a), the second switch K2, the fourth switch K4, the seventh switch K7 and the eighth switch K8 are all configured to be on, that is, the second switch K2, the fourth switch K4, the seventh switch K7 and the eighth switch K8 are closed, and the other switches are open.

[0134] In this case, the fourth switch VT4, the fifth switch VT5, and the sixth switch VT6 are all configured to be turned on, that is, the lower half of the multiphase bridge arm is configured to be turned on along the direction from the midpoint of the bridge arm to the second end of the bridge arm.

[0135] like Figure 6 As shown in (a), the positive terminal of the first battery pack B1 is coupled to the second terminal of multiple coils 2022 via the eighth switch K8 and the seventh switch K7. The negative terminal of the first battery pack B1 is coupled to the second terminal of the multiphase bridge arm 2021 via the second switch K2 and the fourth switch K4. In this way, the first battery pack B1 charges the multiple coils 2022.

[0136] Specifically, the direction of current flow is as follows: Figure 6 As shown in (b).

[0137] In other embodiments, the first stage is as follows: Figure 7 As shown in (a), the third switch K3, the fifth switch K5 and the seventh switch K7 are all configured to be on, that is, the third switch K3, the fifth switch K5 and the seventh switch K7 are closed, and the other switches are open.

[0138] In this case, the fourth switch VT4, the fifth switch VT5, and the sixth switch VT6 are all configured to be turned on, that is, the lower half of the multiphase bridge arm is configured to be turned on along the direction from the midpoint of the bridge arm to the second end of the bridge arm.

[0139] like Figure 7 As shown in (a), the positive terminal of the second battery pack B2 is coupled to the second end of the multiple coils 2022 via the third switch K3 and the seventh switch K7. The negative terminal of the second battery pack B2 is coupled to the second end of the multiphase bridge arm 2021 via the fifth switch K5. In this way, the second battery pack B2 charges the multiple coils 2022.

[0140] Specifically, the direction of current flow is as follows: Figure 7 As shown in (b).

[0141] In other embodiments, the first stage is as follows: Figure 8 As shown in (a), the fourth switch K4, the seventh switch K7 and the tenth switch K10 are configured to be on, that is, the fourth switch K4, the seventh switch K7 and the tenth switch K10 are closed, and the other switches are open.

[0142] In this case, the fourth switch VT4, the fifth switch VT5, and the sixth switch VT6 are all configured to be turned on, that is, the lower half of the multiphase bridge arm is configured to be turned on along the direction from the midpoint of the bridge arm to the second end of the bridge arm.

[0143] like Figure 8 As shown in (a), the positive terminal of charging port 203 is coupled to the second end of multiple coils 2022 via the tenth switch K10 and the seventh switch K7. The negative terminal of charging port 203 is coupled to the second end of the multiphase bridge arm 2021 via the fourth switch K4. In this way, an external power source can charge the multiple coils 2022 through charging port 203.

[0144] Specifically, the direction of current flow is as follows: Figure 8 As shown in (b).

[0145] After charging multiple coils for a preset time, the second stage begins, such as... Figure 9 As shown, at this time, the second switching transistors VT4, VT5, and VT6 are all configured to be off, and the first diode VD1, the second diode VD2, and the third diode VD3 are all configured to be on. That is, the lower half of the multiphase bridge arm is configured to be turned off along the direction from the midpoint of the bridge arm to the second end of the bridge arm, and the upper half of the multiphase bridge arm is configured to be on along the direction from the midpoint of the bridge arm to the first end of the bridge arm.

[0146] In some embodiments, combined with Figure 5 The direction of its current flow is as follows Figure 9 As shown in (a), the positive terminal of the first battery pack B1 is coupled to the second terminal of multiple coils 2022 via the eighth switch K8 and the seventh switch K7. The negative terminal of the first battery pack B1 is coupled to the second terminal of the multiphase bridge arm 2021 via the second switch K2 and the fourth switch K4. Thus, the first battery pack B1 boosts the first voltage input to the second terminal of the multiple coils, outputting a second voltage from the first terminal of the multiphase bridge arm to supply power to the electrical device through the discharge port 204. The positive terminal of the second battery pack B2 is coupled to the second terminal of the multiple coils 2022 via the third switch K3 and the seventh switch K7. The negative terminal of the second battery pack B2 is coupled to the second terminal of the multiphase bridge arm 2021 via the fifth switch K5. Thus, the second battery pack B2 boosts the first voltage input to the second terminal of the multiple coils, outputting a second voltage from the first terminal of the multiphase bridge arm to supply power to the electrical device through the discharge port 204.

[0147] In other embodiments, combined with Figure 6 The direction of its current flow is as follows Figure 9As shown in (b), at this time, the fourth switch VT4, the fifth switch VT5, and the sixth switch VT6 are all configured to be off, and the first diodes VD1, VD2, and VD3 are all configured to be on. The first battery pack B1 boosts the first voltage at the second end of the input multiple coils and outputs the second voltage from the first end of the multiphase bridge arm to supply power to the electrical equipment through the discharge port 204.

[0148] In other embodiments, combined with Figure 7 The direction of its current flow is as follows Figure 9 As shown in (c), the fourth switch VT4, the fifth switch VT5, and the sixth switch VT6 are all configured to be off, and the first diode VD1, the second diode VD2, and the third diode VD3 are all configured to be on. The second battery pack B2 boosts the first voltage at the second end of the input multiple coils and outputs the second voltage from the first end of the multiphase bridge arm to supply power to the electrical equipment through the discharge port 204.

[0149] In other embodiments, combined with Figure 8 The direction of its current flow is as follows Figure 9 As shown in (d), the fourth switch VT4, the fifth switch VT5, and the sixth switch VT6 are all configured to be off, and the first diode VD1, the second diode VD2, and the third diode VD3 are all configured to be on. The external power supply boosts the first voltage at the second end of the multiple coils through the charging port 203, and outputs the second voltage from the first end of the multiphase bridge arm to supply power to the electrical equipment through the discharge port 204.

[0150] After the electrical equipment is running normally, it enters the third stage. The tenth switch K10 is configured to be turned on. That is, based on the second stage, the tenth switch is closed, and the external power supply charges the first battery pack B1 and / or the second battery pack B2 through the charging port. The power is boosted through the electric drive assembly 202 and discharged through the discharge port 204 to supply power to the electrical equipment.

[0151] In some embodiments, combined with Figure 5 (a), such as Figure 10 As shown in (a), the positive terminal of charging port 203 is coupled to the positive terminal of the first battery pack B1 through the tenth switch K10 and the eighth switch K8, and the negative terminal of charging port 203 is coupled to the negative terminal of the first battery pack B1 through the second switch K2. The charging pile charges the first battery pack B1 through charging port 203.

[0152] The positive terminal of charging port 203 is coupled to the positive terminal of the second battery pack B2 via the tenth switch K10 and the third switch K3, and the negative terminal of charging port 203 is coupled to the negative terminal of the second battery pack via the fourth switch K4 and the fifth switch K5. The charging pile charges the second battery pack B2 through charging port 203.

[0153] The positive terminal of charging port 203 is coupled to the second terminal of multiple coils 2022 via the tenth switch K10 and the seventh switch K7. The negative terminal of charging port 203 is coupled to the second terminal of multiphase bridge arm 2021 via the fourth switch K4. In this way, the external power supply boosts the first voltage input to the second terminal of multiple coils through charging port 203, and outputs a second voltage from the first terminal of the multiphase bridge arm to supply power to the electrical equipment through discharge port 204.

[0154] Specifically, the direction of current flow is as follows: Figure 10 As shown in (b).

[0155] In other embodiments, combined with Figure 6 (a), such as Figure 11 As shown in (a), the positive terminal of charging port 203 is coupled to the positive terminal of the first battery pack B1 through the tenth switch K10 and the eighth switch K8, and the negative terminal of charging port 203 is coupled to the negative terminal of the first battery pack B1 through the second switch K2. The charging pile charges the first battery pack B1 through charging port 203.

[0156] The positive terminal of charging port 203 is coupled to the second terminal of multiple coils 2022 via the tenth switch K10 and the seventh switch K7. The negative terminal of charging port 203 is coupled to the second terminal of multiphase bridge arm 2021 via the fourth switch K4. In this way, the external power supply boosts the first voltage input to the second terminal of multiple coils through charging port 203, and outputs a second voltage from the first terminal of the multiphase bridge arm to supply power to the electrical equipment through discharge port 204.

[0157] Specifically, the direction of current flow is as follows: Figure 11 As shown in (b).

[0158] In other embodiments, combined with Figure 7 (a), such as Figure 12 As shown in (a), the positive terminal of charging port 203 is coupled to the positive terminal of the second battery pack B2 through the tenth switch K10 and the third switch K3, and the negative terminal of charging port 203 is coupled to the negative terminal of the second battery pack B2 through the fourth switch K4 and the fifth switch K5. The charging pile charges the second battery pack B2 through charging port 203.

[0159] The positive terminal of charging port 203 is coupled to the second terminal of multiple coils 2022 via the tenth switch K10 and the seventh switch K7. The negative terminal of charging port 203 is coupled to the second terminal of multiphase bridge arm 2021 via the fourth switch K4. In this way, the external power supply boosts the first voltage input to the second terminal of multiple coils through charging port 203, and outputs a second voltage from the first terminal of the multiphase bridge arm to supply power to the electrical equipment through discharge port 204.

[0160] Specifically, the direction of current flow is as follows: Figure 12 As shown in (b).

[0161] Optional, combined Figure 8 and Figure 9 In the embodiment shown in (d), after the electrical equipment is operating normally, it enters the third stage, such as... Figure 10 As shown in (a), the second switch K2, the third switch K3, the fifth switch K5, and the eighth switch K8 are configured to be on. That is, based on the second stage, the second switch K2, the third switch K3, the fifth switch K5, and the eighth switch K8 are closed.

[0162] In this case, the circuit diagram is as follows: Figure 10 As shown in (a), its current flow diagram is as follows: Figure 10 As shown in (b).

[0163] Optionally, in the above embodiments, to protect the circuit, when the battery pack discharges externally, the ninth switch is configured to be turned on when the eighth switch is turned on.

[0164] As shown above, when the charging voltage provided by the charging port is greater than either the rated operating voltage of the first battery pack or the rated operating voltage of the second battery pack, that is, when the charging voltage provided by the power-on port can be adapted to the voltage across the battery pack when the first and second battery packs are connected in parallel, an external power source can charge either the first or second battery pack, or the first and second battery packs connected in parallel, through the charging port. When the charging voltage provided by the charging port is greater than the sum of the rated operating voltages of the first and second battery packs, that is, when the voltage provided by the charging port can be adapted to the voltage across the battery pack when the first and second battery packs are connected in series, and also to the voltage across the electrical equipment, an external power source can charge the first and second battery packs connected in series through the charging port.

[0165] In this embodiment, when the voltage provided by the external power source at the charging port is lower than the voltage platform of the vehicle battery (i.e., the rated voltage of the battery pack when the first and second battery packs are connected in series), the connection relationship of the first and second battery packs can be switched from series to parallel. In this way, when the external power source charges the battery pack through the charging port, it does not need to go through a boost circuit, reducing losses to the vehicle's power devices and improving charging power and efficiency.

[0166] In conjunction with the above embodiments, this application also provides a charging method, applied to, for example... Figure 1 The controller 10, as described above Figure 13 As shown, the charging method includes:

[0167] S1301, Obtain the charging voltage.

[0168] The charging voltage is the charging voltage provided by an external power source through the charging port.

[0169] Combination Figure 2 The controller can obtain the charging voltage provided by the external power supply through the charging port 203.

[0170] S1302. Charge the first battery pack or the second battery pack using the charging voltage.

[0171] The charging voltage is greater than either the rated operating voltage of the first battery pack or the rated operating voltage of the second battery pack.

[0172] It is understandable that when the charging voltage provided by the charging port is greater than either the rated operating voltage of the first battery pack or the rated operating voltage of the second battery pack, that is, when the charging voltage provided by the power-on port can be adapted to the voltage across the first battery pack or the voltage across the second battery pack, the external power supply charges the first battery pack or the second battery pack through the charging port.

[0173] The electric drive assembly boosts the first voltage at the input port of the electric drive assembly and outputs a second voltage at the output port of the electric drive assembly, the second voltage being greater than the first voltage.

[0174] Specifically, in the electric drive assembly, the first end of the multiphase bridge arm is coupled to the positive terminal of the first battery pack and the positive terminal of the charging port, respectively. The second end of the multiphase bridge arm is coupled to the negative terminal of the second battery pack and the negative terminal of the charging port, respectively. The midpoint of the multiphase bridge arm is connected to the first end of multiple coils, and the midpoint of the bridge arm is the connection end of the upper half bridge and the lower half bridge of the bridge arm. The second ends of multiple coils are connected. After the second voltage is output at the first end of the multiphase bridge arm, the charging port charges the first battery pack or the second battery pack.

[0175] For details, please refer to the following: Figure 6 , Figure 7 The implementation methods shown will not be described in detail here.

[0176] In some embodiments, combined with Figure 13 ,like Figure 14 As shown, the charging method also includes:

[0177] S1401. When the charging voltage is greater than the sum of the rated operating voltage of the first battery pack and the rated operating voltage of the second battery pack, the first battery pack and the second battery pack connected in series are charged.

[0178] It is understandable that an external power source charges either the first battery pack B1 or the second battery pack B2. When the charging voltage provided at the charging port is greater than the sum of the rated operating voltages of the first and second battery packs, that is, when the voltage provided at the charging port can be adapted to the voltage across the battery pack when the first and second battery packs are connected in series, and also to the voltage across the electrical equipment, the external power source charges the first and second battery packs connected in series through the charging port.

[0179] For details, please refer to the following: Figure 4 The implementation methods shown will not be described in detail here.

[0180] This application also provides a charging method, applied to, for example... Figure 1 The controller 10, as described above Figure 15 As shown, the charging method includes:

[0181] S1501, Obtain the charging voltage.

[0182] S1502. Charge the first battery pack and the second battery pack using the charging voltage.

[0183] The first battery pack and the second battery pack are connected in parallel. The charging voltage is greater than either the rated operating voltage of the first battery pack or the rated operating voltage of the second battery pack.

[0184] It is understandable that when the charging voltage provided by the charging port is greater than the rated operating voltage of either the first battery pack or the second battery pack, that is, when the charging voltage provided by the power-on port can be adapted to the voltage across the battery pack when the first and second battery packs are connected in parallel, an external power source charges the first and second battery packs connected in parallel through the charging port.

[0185] The electric drive assembly boosts the first voltage at the input port of the electric drive assembly and outputs a second voltage at the output port of the electric drive assembly, the second voltage being greater than the first voltage.

[0186] Specifically, in the electric drive assembly, the second end of the multi-phase bridge arm is coupled to the negative terminal of the second battery pack and the negative terminal of the charging port, respectively. The midpoint of the multi-phase bridge arm is connected to the first end of multiple coils, and the midpoint of the bridge arm is the connection end of the upper half bridge and the lower half bridge of the bridge arm. The second ends of multiple coils are connected. After the second voltage is output at the first end of the multi-phase bridge arm, the charging port charges the first battery pack or the second battery pack.

[0187] For specific details, please refer to, for example Figure 5 The implementation methods shown will not be described in detail here.

[0188] This application also provides a vehicle that includes any of the charging / discharging circuits or charging / discharging systems described in the above embodiments.

[0189] Through the above description of the embodiments, those skilled in the art can clearly understand that, for the sake of convenience and brevity, only the division of the above functional modules is used as an example. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0190] In the several embodiments provided by this invention, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another device, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0191] The units described as separate components may or may not be physically separate. A component shown as a unit can be one or more physical units; that is, it can be located in one place or distributed in multiple different locations. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0192] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0193] The above embodiments are merely preferred embodiments provided to fully illustrate the present invention, and the scope of protection of the present invention is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present invention are all within the scope of protection of the present invention.

Claims

1. A charging and discharging circuit, characterized in that, include: The battery pack includes a first battery pack and a second battery pack; A charging port is coupled to the battery pack; It is configured to charge the first battery pack or the second battery pack by inputting the charging voltage of the charging port; Wherein, the charging voltage is greater than either the rated operating voltage of the first battery pack or the rated operating voltage of the second battery pack; The charging and discharging circuit further includes an electric drive assembly, the input port of which is coupled to the battery pack and the charging port respectively, and the output port of which is used to couple to an electrical device; configured to boost a first voltage input to the input port of the electric drive assembly and output a second voltage from the output port of the electric drive assembly, the second voltage being greater than the first voltage; the electrical device includes at least one of the following: a DC-DC converter, an air conditioning assembly (ACP), and a temperature coefficient thermistor (PTC); The electric drive assembly includes a multi-phase bridge arm and multiple coils; the first end of the multi-phase bridge arm is coupled to the positive terminal of the first battery pack and the positive terminal of the charging port, respectively; the second end of the multi-phase bridge arm is coupled to the negative terminal of the second battery pack and the negative terminal of the charging port, respectively; the midpoint of the multi-phase bridge arm is connected to the first end of the multiple coils, and the midpoint of the bridge arm is the connection end of the upper half bridge and the lower half bridge of the bridge arm; the second ends of the multiple coils are connected; after the second voltage is output at the first end of the multi-phase bridge arm, the charging port is configured to charge the first battery pack or the second battery pack.

2. The charging and discharging circuit according to claim 1, characterized in that, The battery pack also includes: A first branch and a first switch connected to the first branch, the first end of the first branch being coupled to the negative terminal of the first battery pack, and the second end of the first branch being coupled to the positive terminal of the second battery pack; When the charging voltage is greater than either the rated operating voltage of the first battery pack or the rated operating voltage of the second battery pack, the first switch is configured to be open, and the charging port is configured such that the positive terminal of the charging port is coupled to the positive terminal of the first battery pack, and the negative terminal of the charging port is coupled to the negative terminal of the first battery pack, so as to charge the first battery pack. or, The charging port is configured such that the positive terminal of the charging port is coupled to the positive terminal of the second battery pack, and the negative terminal of the charging port is coupled to the negative terminal of the second battery pack, thereby charging the second battery pack.

3. The charging and discharging circuit according to claim 2, characterized in that, The battery pack also includes: The second branch, and the second switch connected to the second branch; the first end of the second branch is coupled to the negative terminal of the charging port, and the second end of the second branch is coupled to the negative terminal of the first battery pack; When the charging voltage is greater than either the rated operating voltage of the first battery pack or the rated operating voltage of the second battery pack, the second switch is configured to be turned on when the first battery pack is being charged.

4. The charging and discharging circuit according to claim 3, characterized in that, The battery pack also includes: A third branch, and a third switch connected to the third branch; the first end of the third branch is coupled to the positive terminal of the charging port, and the second end of the third branch is coupled to the positive terminal of the second battery pack; A fourth branch, and a fourth switch connected to the fourth branch; the first end of the fourth branch is coupled to the negative terminal of the charging port, and the second end of the fourth branch is coupled to the negative terminal of the second battery pack; When the charging voltage is greater than either the rated operating voltage of the first battery pack or the rated operating voltage of the second battery pack, the third switch and the fourth switch are configured to be turned on when the second battery pack is being charged.

5. The charging and discharging circuit according to claim 4, characterized in that, The battery pack also includes: A fifth branch, and a fifth switch connected to the fifth branch; the first end of the fifth branch is coupled to the negative terminal of the second battery pack, and the second end of the fifth branch is coupled to the first end of the fourth branch; When the charging voltage is greater than either the rated operating voltage of the first battery pack or the rated operating voltage of the second battery pack, and the second battery pack is being charged, the fifth switch is configured to be turned on.

6. The charging and discharging circuit according to claim 1, characterized in that, The battery pack also includes: A first branch and a first switch connected to the first branch, the first end of the first branch being coupled to the negative terminal of the first battery pack, and the second end of the first branch being coupled to the positive terminal of the second battery pack; When the charging voltage is greater than the sum of the rated operating voltage of the first battery pack and the rated operating voltage of the second battery pack, the first switch is configured to be turned on, and the charging port is further configured such that: the positive terminal of the charging port is coupled to the positive terminal of the first battery pack, and the negative terminal of the charging port is coupled to the negative terminal of the second battery pack, so as to charge the first battery pack and the second battery pack connected in series.

7. The charging and discharging circuit according to claim 1, characterized in that, The battery pack also includes: A first branch and a first switch connected to the first branch, the first end of the first branch being coupled to the negative terminal of the first battery pack, and the second end of the first branch being coupled to the positive terminal of the second battery pack; A sixth branch, and a sixth switch connected to the sixth branch, the first end of the sixth branch being coupled to the positive terminal of the first battery pack, and the second end of the sixth branch being coupled to the first end of the multiphase bridge arm; When the charging voltage is greater than the sum of the rated operating voltage of the first battery pack and the rated operating voltage of the second battery pack, the first switch is configured to be turned on, the sixth switch is configured to be turned on, and the charging port is further configured such that: the positive terminal of the charging port is coupled to the positive terminal of the first battery pack, and the negative terminal of the charging port is coupled to the negative terminal of the second battery pack, to charge the first battery pack and the second battery pack connected in series, and to discharge to the outside through the first end and the second end of the multiphase bridge arm.

8. The charging and discharging circuit according to claim 7, characterized in that, The battery pack also includes: A seventh branch, and a seventh switch connected to the seventh branch, the first end of the seventh branch being coupled to the positive terminal of the first battery pack, and the second end of the seventh branch being coupled to the second end of the plurality of coils; When the charging voltage is greater than either the rated operating voltage of the first battery pack or the rated operating voltage of the second battery pack, the sixth switch is configured to be open, the seventh switch is configured to be open, and the lower half of the multiphase bridge arm is configured to be open along the midpoint of the bridge arm toward the second end of the bridge arm, so that the battery pack or the charging port charges the plurality of coils. After charging the plurality of coils for a preset time, the lower half of the multiphase bridge arm is configured to be turned off along the direction from the midpoint of the bridge arm to the second end of the bridge arm, and the upper half of the multiphase bridge arm is configured to be turned on along the direction from the midpoint of the bridge arm to the first end of the bridge arm, so as to boost the first voltage input to the second end of the plurality of coils, and output the second voltage from the first end of the multiphase bridge arm.

9. The charging and discharging circuit according to claim 8, characterized in that, The battery pack also includes: The eighth branch and the eighth switch connected to the eighth branch, the first end of the eighth branch being coupled to the positive terminal of the first battery pack, and the second end of the eighth branch being coupled to the first end of the sixth branch and the first end of the seventh branch respectively; The ninth branch, the ninth switch and the current damping device connected to the ninth branch, the first end of the ninth branch being coupled to the positive terminal of the first battery pack, and the second end of the ninth branch being coupled to the first end of the sixth branch and the first end of the seventh branch respectively. When the battery pack is discharging externally, the ninth switch is configured to turn on before the eighth switch turns on.

10. A charging and discharging circuit, characterized in that, include: The battery pack includes a first battery pack and a second battery pack; A charging port is coupled to the battery pack; It is configured to charge the first battery pack and the second battery pack by inputting the charging voltage provided by the charging port, wherein the first battery pack and the second battery pack are connected in parallel; Wherein, the charging voltage is greater than either the rated operating voltage of the first battery pack or the rated operating voltage of the second battery pack; The charging and discharging circuit further includes an electric drive assembly, the input port of which is coupled to the battery pack and the charging port respectively, and the output port of which is used to couple to an electrical device; configured to boost a first voltage input to the input port of the electric drive assembly and output a second voltage from the output port of the electric drive assembly, the second voltage being greater than the first voltage; the electrical device includes at least one of the following: a DC-DC converter, an air conditioning assembly (ACP), and a temperature coefficient thermistor (PTC); The electric drive assembly includes a multi-phase bridge arm and multiple coils; the first end of the multi-phase bridge arm is coupled to the positive terminal of the first battery pack and the positive terminal of the charging port, respectively; the second end of the multi-phase bridge arm is coupled to the negative terminal of the second battery pack and the negative terminal of the charging port, respectively; the midpoint of the multi-phase bridge arm is connected to the first end of the multiple coils, and the midpoint of the bridge arm is the connection end of the upper half bridge and the lower half bridge of the bridge arm; the second ends of the multiple coils are connected; after the second voltage is output at the first end of the multi-phase bridge arm, the charging port is configured to charge the first battery pack or the second battery pack.

11. A charging method, characterized in that, The charging and discharging circuit used in any one of claims 1-9 includes: Obtain the charging voltage; The first battery pack or the second battery pack is charged using the charging voltage. Wherein, the charging voltage is greater than either the rated operating voltage of the first battery pack or the rated operating voltage of the second battery pack; The charging and discharging circuit further includes an electric drive assembly, the input port of which is coupled to the battery pack and the charging port respectively, and the output port of which is used to couple to an electrical device; configured to boost a first voltage input to the input port of the electric drive assembly and output a second voltage from the output port of the electric drive assembly, the second voltage being greater than the first voltage; the electrical device includes at least one of the following: a DC-DC converter, an air conditioning assembly (ACP), and a temperature coefficient thermistor (PTC); The electric drive assembly includes a multi-phase bridge arm and multiple coils; the first end of the multi-phase bridge arm is coupled to the positive terminal of the first battery pack and the positive terminal of the charging port, respectively; the second end of the multi-phase bridge arm is coupled to the negative terminal of the second battery pack and the negative terminal of the charging port, respectively; the midpoint of the multi-phase bridge arm is connected to the first end of the multiple coils, and the midpoint of the bridge arm is the connection end of the upper half bridge and the lower half bridge of the bridge arm; the second ends of the multiple coils are connected; after the second voltage is output at the first end of the multi-phase bridge arm, the charging port is configured to charge the first battery pack or the second battery pack.

12. The charging method according to claim 11, characterized in that, Also includes: When the charging voltage is greater than the sum of the rated operating voltage of the first battery pack and the rated operating voltage of the second battery pack, the first battery pack and the second battery pack connected in series are charged.

13. A charging method, characterized in that, Applied to the charging and discharging circuit as described in claim 10, comprising: Obtain the charging voltage; The first battery pack and the second battery pack are charged using the charging voltage, and the first battery pack and the second battery pack are connected in parallel. Wherein, the charging voltage is greater than either the rated operating voltage of the first battery pack or the rated operating voltage of the second battery pack; The charging and discharging circuit further includes an electric drive assembly, the input port of which is coupled to the battery pack and the charging port respectively, and the output port of which is used to couple to an electrical device; configured to boost a first voltage input to the input port of the electric drive assembly and output a second voltage from the output port of the electric drive assembly, the second voltage being greater than the first voltage; the electrical device includes at least one of the following: a DC-DC converter, an air conditioning assembly (ACP), and a temperature coefficient thermistor (PTC); The electric drive assembly includes a multi-phase bridge arm and multiple coils; the first end of the multi-phase bridge arm is coupled to the positive terminal of the first battery pack and the positive terminal of the charging port, respectively; the second end of the multi-phase bridge arm is coupled to the negative terminal of the second battery pack and the negative terminal of the charging port, respectively; the midpoint of the multi-phase bridge arm is connected to the first end of the multiple coils, and the midpoint of the bridge arm is the connection end of the upper half bridge and the lower half bridge of the bridge arm; the second ends of the multiple coils are connected; after the second voltage is output at the first end of the multi-phase bridge arm, the charging port is configured to charge the first battery pack or the second battery pack.

14. A charging and discharging system, characterized in that, include: The charging and discharging circuit as described in any one of claims 1-10; A controller configured to perform the charging method as described in any one of claims 11-13.

15. A vehicle, characterized in that, Includes the charging / discharging circuit as described in any one of claims 1-10; and / or the charging / discharging system as described in claim 14.

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