Charging circuit and electric equipment

Abstract

The utility model relates to a charging circuit and electric equipment. The charging circuit comprises a switching module and a battery module, wherein the battery module at least comprises a first battery pack and a second battery pack; the battery module is connected with the charging device through the switching module; the switching module at least can switch the working mode of the charging circuit by switching the connection mode of the first battery pack and the second battery pack, and the working mode comprises a parallel charging mode and a series charging mode. The purpose of switching the working modes of the charging circuit by controlling the connection modes of the plurality of battery packs through the switching module can be realized, on one hand, the voltage specification of the battery module can be flexibly improved, and when the voltage specification of the charging device is relatively large, the voltage specification of the battery module is adjusted to be relatively large, so that the charging efficiency can be effectively improved; the voltage specification of the battery module is flexibly adjusted, the purpose of charging the battery module by using charging devices with different voltage specifications can be achieved, and the charging flexibility is improved.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of vehicles, and in particular to a charging circuit and an electric device. BACKGROUND

[0002] With the increasingly mature technology of new energy electric vehicles, the number of new energy electric vehicles on the market is increasing. Among them, with the increasingly mature technology of new energy electric vehicles, lithium batteries are widely used to provide driving energy for new energy electric vehicles due to their high energy density and safe and reliable characteristics.

[0003] Slow charging is the biggest pain point of new energy electric vehicles. In order to improve the charging speed of new energy electric vehicles, various power battery manufacturers or automobile manufacturers are constantly improving the charging power of the battery. Among them, achieving super charging of new energy electric vehicles above 250kW is an important path to solve slow charging. The realization of super charging requires continuous improvement of charging voltage and charging current. At present, there are some power batteries with a voltage specification of 800V on the market and new energy electric vehicles equipped with such power batteries. However, due to the bottleneck of charging current and efficiency, even if the power battery with a voltage specification of 800V is charged, the time required for charging is still far from the time consumed by refueling a fuel vehicle, and it cannot meet the user's demand for fast charging. CONTENT OF THE INVENTION

[0004] In order to overcome the problems in the related art, the present disclosure provides a charging circuit and an electric device.

[0005] According to a first aspect of an embodiment of the present disclosure, a charging circuit is provided, the charging circuit comprising: a switching module and a battery module, the battery module comprising at least a first battery pack and a second battery pack;

[0006] The battery module is connected to a charging device through the switching module;

[0007] The switching module can switch the working mode of the charging circuit by switching the connection mode of the first battery pack and the second battery pack, and the working mode includes a parallel charging mode and a series charging mode.

[0008] Optionally, the switching module comprises: a first switch assembly and a second switch assembly, the first switch assembly and the second switch assembly each comprising at least two contact ends and at least one fixed end;

[0009] A first contact end of the at least two contact ends of the first switch assembly is connected to the first end of the first battery pack and the charging device, respectively, a second contact end of the at least two contact ends of the first switch assembly is connected to a second contact end of the at least two contact ends of the second switch assembly, and at least one fixed end of the first switch assembly is connected to the first end of the first battery pack.

[0010] A first contact end of the at least two contact ends of the second switch assembly is connected to the second end of the first battery pack and the charging device, respectively, and at least one fixed end of the second switch assembly is connected to the second end of the second battery pack.

[0011] Optionally, the first switch assembly comprises a first single-pole double-throw switch, and / or the second switch assembly comprises a second single-pole double-throw switch.

[0012] Optionally, the operation mode of the charging circuit further comprises a discharging mode.

[0013] The first battery pack and / or the second battery pack are used to be connected to a high-voltage load for supplying power to the high-voltage load when the charging circuit operates in the discharging mode.

[0014] Optionally, the switching module further comprises a third switch assembly, and the first battery pack and / or the second battery pack are used to be connected to the high-voltage load through the third switch assembly.

[0015] When the third switch assembly is closed, the operation mode of the charging circuit is the discharging mode.

[0016] Optionally, the switching module further comprises a fourth switch assembly, and the first battery pack and / or the second battery pack are used to be connected to the charging device through the fourth switch assembly.

[0017] When the first battery pack and the second battery pack are connected in series or in parallel and the third switch assembly is closed, whether the charging device is used to charge the first battery pack and the second battery pack while the charging circuit supplies power to the high-voltage load is determined by controlling the on-off of the fourth switch assembly.

[0018] Optionally, the switching module further comprises a fifth switch assembly, and the fifth switch assembly is arranged between the second end of the first battery pack and a first contact end of the at least two contact ends of the second switch assembly.

[0019] Optionally, the charging circuit further comprises at least a first converter and a second converter, the first converter is connected to the first battery pack, and the second converter is connected to the second battery pack.

[0020] The first converter is connected with the second converter, and is configured to balance the first battery pack and the second battery pack.

[0021] Optionally, the first converter is further configured to be connected with a low-voltage load, so that the first battery pack supplies power to the low-voltage load via the first converter; and / or

[0022] The second converter is further configured to be connected with the low-voltage load, so that the second battery pack supplies power to the low-voltage load via the second converter.

[0023] According to a second aspect of the embodiments of the present disclosure, an electric device is provided, which comprises the charging circuit provided by the first aspect of the embodiments of the present disclosure.

[0024] Optionally, the electric device is a vehicle, a ship or an aircraft, and the first battery pack and the second battery pack are power batteries.

[0025] With the above technical solution, the battery module comprises a plurality of battery packs, and the connection mode of the plurality of battery packs is controlled by the switching module to achieve the purpose of switching the working mode of the charging circuit. On the one hand, the voltage specification of the battery module can be flexibly improved. When the voltage specification of the charging device is large, the voltage specification of the battery module is adjusted to be large, which can effectively improve the charging efficiency. On the other hand, the voltage specification of the battery module can be flexibly adjusted, so that the battery module can be charged by using charging devices with different voltage specifications, thereby improving the flexibility of charging.

[0026] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0027] The accompanying drawings, which are incorporated into and form part of the specification, illustrate embodiments consistent with the present disclosure and, together with the specification, serve to explain the principles of the present disclosure.

[0028] Figure 1 is a block diagram of a charging circuit according to an exemplary embodiment.

[0029] Figure 2 is a schematic diagram of a charging circuit according to an exemplary embodiment.

[0030] Figure 3 is a schematic diagram of another charging circuit according to an exemplary embodiment.

[0031] Figure 4 is a schematic diagram of a charging circuit according to an exemplary embodiment.

[0032] Figure 5 is a schematic diagram of another charging circuit according to an example embodiment.

[0033] Figure 6 is a schematic diagram of another charging circuit according to an example embodiment. DETAILED DESCRIPTION

[0034] The example embodiments will be described in detail herein with reference to the attached drawings. The description below refers to the accompanying drawings, which show by way of examples specific embodiments in which like reference numerals represent similar elements. The embodiments described in the following examples are not meant to be an all-inclusive description of all embodiments consistent with the disclosure. Rather, they are merely examples that can be practiced with apparatus and methods consistent with some aspects of the disclosure as detailed in the appended claims.

[0035] It should be noted that all the actions of obtaining signals, information or data in this application are carried out in accordance with the corresponding data protection regulations and policies of the country where the device is located, and with the authorization of the owner of the corresponding device.

[0036] In the related art, the vehicle-side voltage is usually improved by the following three technical solutions. Among them, the first technical solution is to increase an additional DCDC device, for example, to increase a DCDC converter to increase the battery voltage. The second technical solution is to multiplex the motor drive, and to use the motor winding and the inverter to realize voltage boosting. However, the above two solutions need to increase the hardware, thereby increasing the system hardware cost. The third technical solution is to directly increase the voltage specification of the power battery in the vehicle to the target voltage specification required, for example, to produce a power battery with a voltage specification of 1500V, and to configure the power battery in the vehicle to provide power. When the voltage specification of the power battery on the vehicle is increased, the rated voltage of the high-voltage load charged by the power battery also needs to be increased to the voltage specification consistent with the power battery. However, the currently mass-produced high-voltage semiconductor devices are mainly concentrated in 1200V. That is, although there are some high-voltage semiconductor device industry chains that can produce high-voltage semiconductor devices consistent with the 1500V power battery, the production cost is high, and the yield of the generated high-voltage semiconductor devices is low. Therefore, in this technical solution, a new high-voltage semiconductor device industry chain needs to be developed to produce high-voltage semiconductor devices with higher voltage specifications, resulting in increased cost.

[0037] In view of this, the present disclosure provides a charging circuit and an electric device. The battery module includes multiple battery packs. By controlling the connection mode of the multiple battery packs through a switching module, the working mode of the charging circuit can be switched. On the one hand, the voltage specification of the battery module can be flexibly increased. When the voltage specification of the charging device is large, adjusting the voltage specification of the battery module to a larger voltage specification can effectively improve the charging efficiency. On the other hand, flexibly adjusting the voltage specification of the battery module can achieve the purpose of charging the battery module using charging devices with different voltage specifications, thereby improving the charging flexibility.

[0038] Figure 1 This is a block diagram illustrating a charging circuit according to an exemplary embodiment. Figure 1 As shown, the charging circuit 100 may include a switching module 101 and a battery module 102. The battery module 102 includes at least a first battery pack and a second battery pack. For example, the battery module 102 may include N battery packs, and the voltage specifications of the N battery packs may be the same or different. Here, N is an integer greater than or equal to 2. For ease of description, this disclosure uses the example of the battery module 102 including a first battery pack 1021 and a second battery pack 1022 for description.

[0039] In this disclosure, the battery module 102 is connected to the charging device 200 via a switching module 101. For example... Figure 1 As shown, the battery module 102 is connected to the switching module 101, which is used to connect to the charging device 200. The charging device 200 can be a charging pile.

[0040] The switching module 101 can switch the operating mode of the charging circuit by switching the connection method of the first battery pack 1021 and the second battery pack 1022. The operating modes include parallel charging mode and series charging mode.

[0041] For example, the switching module 101 can control the connection method of the first battery pack 1021 and the second battery pack 1022 to be connected in series or in parallel, thereby achieving the purpose of switching the working mode of the charging circuit 100. For instance, when the switching module 101 controls the first battery pack 1021 and the second battery pack 1022 to be connected in series, the working mode of the charging circuit 100 is the series charging mode; when the switching module 101 controls the first battery pack 1021 and the second battery pack 1022 to be connected in parallel, the working mode of the charging circuit 100 is the parallel charging mode.

[0042] It should be understood that the disclosure does not limit the voltage specifications of the first battery pack 1021 and the second battery pack 1022. For example, the voltage specifications of the first battery pack 1021 and the second battery pack 1022 can be the same, both 750V, or both 500V. For another example, the voltage specifications of the first battery pack 1021 and the second battery pack 1022 can be different, for example, the voltage specification of the first battery pack 1021 is 750V, and the voltage specification of the second battery pack 1022 is 500V. In this case, in order to further ensure the safety of charging, an equalization module can also be included in the charging circuit, which can equalize the voltage of the first battery pack and the second battery pack when the first battery pack and the second battery pack are connected in parallel. The disclosure does not make specific limitations here.

[0043] For example, it is described with the voltage specifications of the first battery pack 1021 and the second battery pack 1022 being the same and being 750V. If the voltage specification of the charging device 200, that is, the maximum charging voltage is greater than or equal to 750V and less than 1500V, the switching module 101 controls the connection mode of the first battery pack 1021 and the second battery pack 1022 to be parallel connection, so as to switch the working mode of the charging circuit 100 to parallel charging mode. If the voltage specification of the charging device 200 is greater than or equal to 1500V, the switching module 101 preferentially controls the connection mode of the first battery pack 1021 and the second battery pack 1022 to be series connection, so as to switch the working mode of the charging circuit 100 to series charging mode.

[0044] For another example, the voltage specifications of the first battery pack 1021 and the second battery pack 1022 can also be other voltage specifications, for example, the voltage specifications of the first battery pack 1021 and the second battery pack 1022 are both 500V. At this time, when the voltage specification of the charging device 200 is greater than or equal to 500V and less than 1000V, the switching module 101 controls the connection mode of the first battery pack 1021 and the second battery pack 1022 to be parallel connection, so as to switch the working mode of the charging circuit 100 to parallel charging mode. If the voltage specification of the charging device 200 is greater than or equal to 1000V, the switching module 101 preferentially controls the connection mode of the first battery pack 1021 and the second battery pack 1022 to be series connection, so as to switch the working mode of the charging circuit 100 to series charging mode.

[0045] It should be understood that if one of the first battery pack 1021 and the second battery pack 1022 fails, the switching module 101 can also control the connection mode of the first battery pack 1021 and the second battery pack 1022 to be parallel connection, so as to switch the working mode of the charging circuit 100 to parallel charging mode.

[0046] According to the technical scheme, the battery module includes a plurality of battery packs, and the connection mode of the plurality of battery packs is controlled by the switching module to achieve the purpose of switching the working mode of the charging circuit. On the one hand, the voltage specification of the battery module can be flexibly improved. When the voltage specification of the charging device is large, the voltage specification of the battery module is adjusted to be large, so that the charging efficiency can be effectively improved. On the other hand, the voltage specification of the battery module can be flexibly adjusted, so that the battery module can be charged by using charging devices with different voltage specifications, and the flexibility of charging is improved.

[0047] In an embodiment, the switching module can include a first switch assembly and a second switch assembly, and each of the first switch assembly and the second switch assembly includes at least two contact terminals and at least one fixed terminal. The first contact terminal of the at least two contact terminals of the first switch assembly is connected to the first end of the second battery pack and the charging device respectively, the second contact terminal of the at least two contact terminals of the first switch assembly is connected to the second contact terminal of the at least two contact terminals of the second switch assembly, and the at least one fixed terminal of the first switch assembly is connected to the first end of the first battery pack. The first contact terminal of the at least two contact terminals of the second switch assembly is connected to the second end of the first battery pack and the charging device respectively, and the at least one fixed terminal of the second switch assembly is connected to the second end of the second battery pack.

[0048] In this embodiment, the first end of the first battery pack and the first end of the second battery pack are negative, and the second end of the first battery pack and the second end of the second battery pack are positive. Alternatively, the first end of the first battery pack and the first end of the second battery pack are positive, and the second end of the first battery pack and the second end of the second battery pack are negative.

[0049] In this embodiment, when the first contact terminal of the first switch assembly is in contact with the first target fixed terminal of the at least one fixed terminal of the first switch assembly, and the first contact terminal of the second switch assembly is in contact with the first target fixed terminal of the at least one fixed terminal of the second switch assembly, the working mode of the charging circuit is to charge the module in parallel; and when the second contact terminal of the first switch assembly is in contact with the second target fixed terminal of the at least one fixed terminal of the first switch assembly, and the second contact terminal of the second switch assembly is in contact with the second target fixed terminal of the at least one fixed terminal of the second switch assembly, the working mode of the charging circuit is to charge the module in series.

[0050] In one embodiment of the embodiment, the first switch assembly and the second switch assembly each comprises at least two single-pole single-throw switches. For example, the first switch assembly comprises a first single-pole single-throw switch and a second single-pole single-throw switch, and the second switch assembly comprises a third single-pole single-throw switch and a fourth single-pole single-throw switch. In this case, the contact end of the first single-pole single-throw switch is the first contact end of the first switch assembly, and is connected to the first end of the second battery pack and the charging device respectively. The contact end of the second single-pole single-throw switch is connected to the contact end of the fourth single-pole single-throw switch. The fixed end of the first single-pole single-throw switch and the fixed end of the second single-pole single-throw switch are both connected to the first end of the first battery pack. The contact end of the third single-pole single-throw switch is the first contact end of the second switch assembly, and is connected to the second end of the first battery pack and the charging device respectively. The fixed end of the third single-pole single-throw switch and the fixed end of the fourth single-pole single-throw switch are both connected to the second end of the second battery pack.

[0051] In this embodiment, the first target fixed end of the at least one fixed end of the first switch assembly refers to the fixed end corresponding to the first contact end. For example, when the first contact end is the contact end of the first single-pole single-throw switch, the first target fixed end of the at least one fixed end of the first switch assembly is the fixed end of the first single-pole single-throw switch. Similarly, when the first contact end of the second switch assembly is the contact end of the third single-pole single-throw switch, the first target fixed end of the at least one fixed end of the second switch assembly is the fixed end of the third single-pole single-throw switch. Accordingly, when the first single-pole single-throw switch and the third single-pole single-throw switch are closed, the first battery pack and the second battery pack are connected in parallel, and the working mode of the charging circuit is the parallel charging mode. Similarly, the second target fixed end of the at least one fixed end of the first switch assembly can be the fixed end of the second single-pole single-throw switch, and the second target fixed end of the at least one fixed end of the second switch assembly can be the fixed end of the fourth single-pole single-throw switch. When the second single-pole single-throw switch and the fourth single-pole single-throw switch are closed, the first battery pack and the second battery pack are connected in series, and the working mode of the charging circuit is the series charging mode.

[0052] In another embodiment of the embodiment, the first switch assembly comprises a first single-pole double-throw switch, and / or the second switch assembly comprises a second single-pole double-throw switch.

[0053] Figure 2 is a schematic diagram of a charging circuit according to an exemplary embodiment. As shown in FIG. 1, the charging circuit comprises a first battery pack 100, a second battery pack 200, a charging device 300, a first switch assembly 400, and a second switch assembly 500. Figure 2As shown, assuming the first battery pack is Bank 1, the second battery pack is Bank 2, the first switch assembly includes a first single-pole double-throw switch SPDT1, and the second switch assembly includes a second single-pole double-throw switch SPDT2. The first end of the battery pack is negative, and the second end is positive. The first contact end B1 of the first single-pole double-throw switch SPDT1 is connected to the negative of Bank 2 and the charging device respectively, the second contact end C1 of the first single-pole double-throw switch SPDT1 is connected to the second contact end C2 of the second single-pole double-throw switch SPDT2, and the fixed end A1 of the first single-pole double-throw switch SPDT1 is connected to the negative of Bank 1. The first contact end B2 of the second single-pole double-throw switch SPDT2 is connected to the positive of Bank 1 and the charging device respectively, and the fixed end A2 of the second single-pole double-throw switch SPDT2 is connected to the positive of Bank 2.

[0054] Correspondingly, when the fixed end A1 of the first single-pole double-throw switch SPDT1 is in contact with the first contact end B1 of SPDT1, and the fixed end A2 of the second single-pole double-throw switch SPDT2 is in contact with the first contact end B2 of SPDT2, Bank 1 and Bank 2 are connected in parallel, that is, the charging circuit works in parallel charging mode. When the fixed end A1 of the first single-pole double-throw switch SPDT1 is in contact with the second contact end C1 of SPDT1, and the fixed end A2 of the second single-pole double-throw switch SPDT2 is in contact with the second contact end C2 of SPDT2, Bank 1 and Bank 2 are connected in series, that is, the charging circuit works in series charging mode.

[0055] That is, when it is detected that the voltage specification of the charging device is greater than or equal to the first voltage specification and less than the second voltage specification, the fixed end A1 of the first single-pole double-throw switch SPDT1 is in contact with the first contact end B1 of SPDT1, and the fixed end A2 of the second single-pole double-throw switch SPDT2 is in contact with the first contact end B2 of SPDT2, so that the charging circuit works in parallel charging mode. And when it is detected that the voltage specification of the charging device is greater than or equal to the second voltage specification, the fixed end A1 of the first single-pole double-throw switch SPDT1 is in contact with the second contact end C1 of SPDT1, and the fixed end A2 of the second single-pole double-throw switch SPDT2 is in contact with the second contact end C2 of SPDT2, so that the charging circuit works in series charging mode. For example, the first voltage specification is the voltage specification of the first battery pack or the second battery pack, and the second voltage specification is the sum of the voltage specification of the first battery pack and the voltage specification of the second battery pack.

[0056] In addition, in another embodiment, the first switch assembly includes a first single-pole double-throw switch, and the second switch assembly includes two single-pole single-throw switches. Alternatively, the first switch assembly includes two single-pole single-throw switches, and the first switch assembly includes a second single-pole double-throw switch.

[0057] By using the technical scheme, different connection modes of the first battery pack and the second battery pack are realized by the switch assembly, and on the basis of ensuring that the voltage specification of the battery module can be flexibly adjusted, the convenience of switching the working mode of the charging circuit is improved.

[0058] In addition, in the present disclosure, the charging circuit can also supply power to a high-voltage load. Therefore, in an embodiment, the working mode of the charging circuit can also include a discharging mode. Accordingly, the first battery pack and / or the second battery pack are used to be connected to the high-voltage load for supplying power to the high-voltage load when the charging circuit works in the discharging mode. The high-voltage load can include, but is not limited to, an EDS (Electrical Drive System), a PTC (Positive Temperature Coefficient) heater, and a CCU (Compressor Control Unit).

[0059] In this embodiment, the high-voltage load can be connected to only the first battery pack or only the second battery pack to be powered by the first battery pack or the second battery pack. Alternatively, the high-voltage load can be connected to both the first battery pack and the second battery pack to be powered by both the first battery pack and the second battery pack. In an implementation, the first battery pack and / or the second battery pack are directly connected to the high-voltage load, i.e., the first battery pack and / or the second battery pack always supply power to the high-voltage load. For example, as shown in the charging circuit, one end of the high-voltage load can be connected to the positive electrode of Bank2, and the other end of the high-voltage load can be connected to the negative electrode of Bank2. Alternatively, one end of the high-voltage load can be connected to the positive electrode of Bank1, and the other end of the high-voltage load can be connected to the negative electrode of Bank1. For another example, one end of the high-voltage load can be connected to the positive electrode of Bank1, and the other end of the high-voltage load can be connected to the negative electrode of Bank2. In this way, the voltage after the series connection of Bank1 and Bank2 can be used to supply power to the high-voltage load. Figure 2

[0060] It is considered that the charging circuit is used to supply power to the high-voltage load only when the high-voltage load needs to be used. For example, the charging circuit is used to supply power to the high-voltage load only when the vehicle is driving or when the battery pack needs to be cooled or heated during charging. When the high-voltage load does not need to be powered, the electrical connection between the charging circuit and the high-voltage load can be disconnected. Therefore, the control of whether to charge the high-voltage load can also be realized by the switching module. In another implementation, the switching module can also include a third switch assembly, and the first battery pack and / or the second battery pack are connected to the high-voltage load through the third switch assembly.

[0061] ​In this embodiment, the third switch assembly can be a single-pole single-throw switch. When the high-voltage load is connected to the first battery pack, the single-pole single-throw switch can be disposed between the first battery pack and the high-voltage load. When the high-voltage load is connected to the second battery pack, the single-pole single-throw switch can be disposed between the second battery pack and the high-voltage load. When the high-voltage load is connected to the first battery pack and the second battery pack, the single-pole single-throw switch can be disposed between the second battery pack and the high-voltage load or can be disposed between the first battery pack and the high-voltage load, which is not specifically limited in the present disclosure.

[0062] In this embodiment, the first switch assembly can include the first switch K1 and / or the second switch K2. The first switch K1 is connected between the positive electrode of the battery pack and the high-voltage load, and the second switch K2 is connected between the negative electrode of the battery pack and the high-voltage load. In one possible way, the first switch assembly includes the first switch K1. The first switch K1 can be connected between the positive electrode of the first battery pack or the positive electrode of the second battery pack and one end of the high-voltage load. The first battery pack or the second battery pack is used to supply power to the high-voltage load when the first switch K1 is closed. The first battery pack or the second battery pack is prohibited from supplying power to the high-voltage load when the first switch K1 is open.

[0063] In another possible way, the first switch assembly includes the second switch K2. The second switch K2 can be connected between the negative electrode of the first battery pack or the negative electrode of the second battery pack and one end of the high-voltage load. The first battery pack or the second battery pack is used to supply power to the high-voltage load when the second switch K2 is closed. The first battery pack or the second battery pack is prohibited from supplying power to the high-voltage load when the second switch K2 is open.

[0064] In yet another possible way, the first switch assembly includes the first switch K1 and the second switch K2. For example, Figure 3 is a schematic diagram of another charging circuit according to an exemplary embodiment. As shown in Figure 3 It is assumed that the high-voltage load is connected to the second battery pack, the positive electrode of the second battery pack Bank2 is connected to one end of the high-voltage load through the first switch K1. For example, the positive electrode of the second battery pack Bank2 is connected to one end of the high-voltage load through the first switch K1, and the other end of the high-voltage load is connected to the negative electrode of the second battery pack Bank2 through the second switch K2.

[0065] Referring to Figure 3When the first switch K1 and the second switch K2 are both closed, the second battery pack Bank2 is used to supply power to the high-voltage load. When the first switch K1 and / or the second switch K2 is open, the supply of power to the high-voltage load is prohibited. For example, when the fixed terminal A1 of the SPDT1 is in contact with the first contact terminal B1 of the SPDT1, the fixed terminal A2 of the SPDT2 is in contact with the first contact terminal B2 of the SPDT2, and the first switch K1 and the second switch K2 are closed, the charging circuit is in the parallel charging mode and the discharging mode. That is, while the charging device is charging the first battery pack Bank1 and / or the second battery pack Bank2, the first battery pack Bank1 or the second battery pack Bank2 supplies power to the high-voltage load. When the fixed terminal A1 of the SPDT1 is in contact with the second contact terminal C1 of the SPDT1, the fixed terminal A2 of the SPDT2 is in contact with the second contact terminal C2 of the SPDT2, and the first switch K1 and the second switch K2 are closed, the charging circuit is in the series charging mode and the discharging mode. That is, while the charging device is charging the first battery pack Bank1 and the second battery pack Bank2, the second battery pack Bank2 supplies power to the high-voltage load. When the SPDT1 and the SPDT2 are both open and the first switch K1 and the second switch K2 are closed, the second battery pack Bank2 can be used to supply power to the high-voltage load without charging.

[0066] It should be understood that the high-voltage load can also be connected to the first battery pack Bank1 through the first switch K1 and the second switch K2, for example, the positive electrode of the first battery pack Bank1 is connected to one end of the high-voltage load through the first switch K1, and the negative electrode of the first battery pack Bank1 is connected to the other end of the high-voltage load through the second switch K2, so that the first battery pack Bank1 is used to supply power to the high-voltage load when the first switch K1 and the second switch K2 are both closed.

[0067] With the above technical solution, the high-voltage load can be supplied with power when the third switch assembly is closed, and the supply of power to the high-voltage load is stopped when the third switch assembly is open, so that whether to supply power to the high-voltage load can be controlled through the third switch assembly.

[0068] In an embodiment, when the charging circuit supplies power to the high-voltage load, whether the charging device charges the battery modules in the charging circuit can also be controlled. Accordingly, the switching module can further include a fourth switch assembly located between the battery modules and the charging device. For example, the first battery pack and / or the second battery pack are connected to the charging device through the fourth switch assembly. When the first battery pack and the second battery pack are connected in series or connected in parallel, and the third switch assembly is closed, whether the charging device charges the first battery pack and the second battery pack while the charging circuit supplies power to the high-voltage load can be determined by controlling the on-off of the fourth switch assembly.

[0069] In this embodiment, the fourth switch assembly can include a third switch K3 and / or a fourth switch K4. The third switch K3 is a switch arranged between the charging device and the positive electrode of the battery pack, and the fourth switch K4 is a switch arranged between the charging device and the negative electrode of the battery pack.

[0070] In one possible way, the fourth switch assembly can include the third switch K3. One end of the third switch K3 is connected to the positive electrode of the charging device, and the other end of the third switch K3 is connected to the positive electrode of the first battery pack and the first contact end B2 of the SPDT2. When the third switch K3 is closed, the fixed end A1 of the SPDT1 is in contact with the first contact end B1 of the SPDT1, the fixed end A2 of the SPDT2 is in contact with the first contact end B2 of the SPDT2, and the third switch assembly is closed, the first battery pack and the second battery pack are connected in parallel, and the charging circuit is in the parallel charging mode and the parallel discharging mode. When the third switch K3 is open, the fixed end A1 of the SPDT1 is in contact with the first contact end B1 of the SPDT1, the fixed end A2 of the SPDT2 is in contact with the first contact end B2 of the SPDT2, and the third switch assembly is closed, the first battery pack and the second battery pack are connected in parallel, and the charging circuit is in the parallel discharging mode. Similarly, when the fixed end A1 of the SPDT1 is in contact with the second contact end C1 of the SPDT1, the fixed end A2 of the SPDT2 is in contact with the second contact end C2 of the SPDT2, and the third switch assembly is closed, if the third switch K3 is closed, the charging circuit is in the series charging mode and the discharging mode. When the fixed end A1 of the SPDT1 is in contact with the second contact end C1 of the SPDT1, the fixed end A2 of the SPDT2 is in contact with the second contact end C2 of the SPDT2, and the third switch assembly is closed, if the third switch K3 is open, the charging circuit is only in the discharging mode. If the connection structure of the high-voltage load and the charging circuit is as shown in FIG. 6, the discharging mode at this time can mean that the first battery pack and the second battery pack are connected in series, and the second battery pack is used to supply power to the high-voltage load. Figure 3

[0071] In another possible way, the fourth switch assembly can include the fourth switch K4. One end of the fourth switch K4 is connected to the negative electrode of the second battery pack, and the other end of the fourth switch K4 is connected to the charging device. The working modes of the charging circuit are as shown above, and will not be described here.

[0072] In yet another possible way, the fourth switch assembly can include the third switch K3 and the fourth switch K4. For example, Figure 4 is a schematic diagram of a charging circuit according to an exemplary embodiment. In this embodiment, the fourth switch assembly can include the third switch K3 and / or the fourth switch K4. Figure 4 ​In the specific connection mode of the third switch K3 and the fourth switch K4, when both the third switch K3 and the fourth switch K4 are closed, the fourth switch assembly is considered to be closed and conductive. When at least one of the third switch K3 and the fourth switch K4 is open, the fourth switch assembly is considered to be open.

[0073] Referring to Figure 4 In the case where the first battery pack and the second battery pack are connected in series or in parallel, and the third switch assembly is closed, if both the third switch K3 and the fourth switch K4 are closed, the first battery pack and / or the second battery pack is charged by the charging device while the high-voltage load is powered by the first battery pack and / or the second battery pack. If at least one of the third switch K3 and the fourth switch K4 is open, the first battery pack and / or the second battery pack is prohibited from being charged by the charging device while the high-voltage load is powered by the first battery pack and / or the second battery pack.

[0074] In this way, the flexibility of the control of the working mode of the charging circuit is further improved, and the requirements of different working modes can be met.

[0075] In an embodiment, in the case where the battery module includes a plurality of battery packs, one of the battery packs can also be selected to be charged. Accordingly, the switching module can further include a fifth switching assembly arranged between the second end of the first battery pack and the first contact end of the second switching assembly.

[0076] Figure 5 is a schematic diagram of another charging circuit according to an exemplary embodiment. As Figure 5 As shown, the fifth switching assembly can include a fifth switch K5. One end of the fifth switch K5 is connected to the positive electrode of the first battery pack Bank1, and the other end of the fifth switch K5 is connected to the first contact end B2 of the SPDT2. When the fifth switch K5 is open, the third switch K3 and the fourth switch K4 are closed, and the fixed end A2 of the SPDT2 is in contact with the first contact end B2 of the SPDT2, the charging device only charges the second battery pack Bank2. When the fifth switch K5, the third switch K3, and the fourth switch K4 are all closed, and the fixed end A1 of the SPDT1 is in contact with the first contact end B1 of the SPDT1, and the fixed end A2 of the SPDT2 is in contact with the first contact end B2 of the SPDT2, the working mode of the charging circuit is parallel charging. When the fifth switch K5, the third switch K3, and the fourth switch K4 are all closed, and the fixed end A1 of the SPDT1 is in contact with the second contact end C1 of the SPDT1, and the fixed end A2 of the SPDT2 is in contact with the second contact end C2 of the SPDT2, the working mode of the charging circuit is series charging.

[0077] In this way, the flexibility of the control of the working mode of the charging circuit is further improved.

[0078] In addition, in order to ensure charging safety, when the first battery pack and the second battery pack are connected in parallel, the voltages of the two should be the same, therefore, in the present disclosure, in order to ensure charging safety, the charging circuit can further comprise a plurality of converters. Wherein, the number of converters can be the same as the number of battery packs included in the battery module. Therefore, the charging circuit further comprises at least a first converter and a second converter, the first converter is connected with the first battery pack, and the second converter is connected with the second battery pack. The first converter is connected with the second converter, and is used to balance the first battery pack and the second battery pack.

[0079] For example, Figure 6 is a schematic diagram of another charging circuit according to an exemplary embodiment. As Figure 6 indicated, the first converter can be a DCDC converter 1. The second converter can be a DCDC converter 2. The DCDC converter 1 and the DCDC converter 2 cooperate to balance the voltages of the first battery pack Bank1 and the second battery pack Bank2, so as to ensure that the voltages of the two are the same when they are connected in parallel.

[0080] The charging circuit provided by the present disclosure can also supply power to a low-voltage load. Accordingly, the first converter is used to be connected with the low-voltage load, so that the first battery pack supplies power to the low-voltage load via the first converter; and / or, the second converter is also used to be connected with the low-voltage load, so that the second battery pack supplies power to the low-voltage load via the second converter.

[0081] Wherein, the first converter is used to convert the voltage of the first battery pack into the voltage required by the low-voltage load, and the second converter is used to convert the voltage of the second battery pack into the voltage required by the low-voltage load.

[0082] For example, in order to ensure that another battery pack can be used to supply power to the low-voltage load when one battery pack is abnormal, as Figure 6 indicated, the DCDC converter 1 and the DCDC converter 2 are respectively connected with the low-voltage load, so that the first battery pack Bank1 supplies power to the low-voltage load via the DCDC converter 1 and / or the second battery pack Bank2 supplies power to the low-voltage load via the DCDC converter 2.

[0083] With the above technical solution, the charging circuit further comprises at least a first converter and a second converter, thus, the purpose of using the first battery pack and / or the second battery pack to supply power to the low-voltage load can be achieved, and the first converter and the second converter can be used to balance the first battery pack and the second battery pack when the two are connected in parallel, so as to ensure charging safety.

[0084] Based on the same concept, the present disclosure further provides an electric device, which can comprise the charging circuit provided by the present disclosure.

[0085] By way of example, the electrically powered device can be a vehicle, a watercraft, or an aircraft, and the first and second battery packs can be power batteries.

[0086] Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure. Variations and modifications of the embodiments disclosed herein can be made based on the description set forth herein, without departing from the scope and spirit of the disclosure. The application is intended to cover any variations, uses or adaptations of the disclosure including such departures from the present disclosure as come within known or customary practice in the art to which the disclosure pertains. The specification and examples are to be regarded as exemplary only, and the true scope and spirit of the disclosure are indicated by the following claims.

[0087] It should be understood that the present disclosure is not limited to the precise structures herein described and illustrated in the drawings, and that various modifications and changes can be made without departing from the scope of the present disclosure. The scope of the present disclosure is limited only by the claims that follow.

Claims

1. A charging circuit, characterized in that, The charging circuit includes a switching module and a battery module, wherein the battery module includes at least a first battery pack and a second battery pack. The battery module is used to connect to the charging device via the switching module; The switching module can switch the operating mode of the charging circuit by switching the connection method of the first battery pack and the second battery pack. The operating mode includes parallel charging mode and series charging mode.

2. The charging circuit according to claim 1, characterized in that, The switching module includes: a first switch assembly and a second switch assembly, wherein both the first switch assembly and the second switch assembly include at least two contact ends and at least one fixed end; The first contact terminal of the first switch assembly is connected to the first terminal of the second battery pack and the charging device, respectively; the second contact terminal of the first switch assembly is connected to the second contact terminal of the second switch assembly; and at least one fixed terminal of the first switch assembly is connected to the first terminal of the first battery pack. The first contact end of at least two contact ends of the second switch assembly is connected to the second end of the first battery pack and the charging device, respectively, and at least one fixed end of the second switch assembly is connected to the second end of the second battery pack.

3. The charging circuit according to claim 2, characterized in that, The first switching assembly includes a first single-pole double-throw switch, and / or the second switching assembly includes a second single-pole double-throw switch.

4. The charging circuit according to claim 1, characterized in that, The charging circuit also includes a discharging mode. The first battery pack and / or the second battery pack are used to connect to a high-voltage load and to supply power to the high-voltage load when the charging circuit is operating in the discharge mode.

5. The charging circuit according to claim 4, characterized in that, The switching module further includes a third switching assembly, through which the first battery pack and / or the second battery pack are connected to the high-voltage load; When the third switch assembly is closed, the charging circuit operates in the discharging mode.

6. The charging circuit according to claim 5, characterized in that, The switching module further includes a fourth switching component, through which the first battery pack and / or the second battery pack are connected to the charging device; When the first battery pack and the second battery pack are connected in series or in parallel, and the third switch assembly is closed, the on / off state of the fourth switch assembly is controlled to determine whether the charging device is used to charge the first battery pack and the second battery pack while the charging circuit is supplying power to the high-voltage load.

7. The charging circuit according to claim 2, characterized in that, The switching module further includes a fifth switching component, which is disposed between the second end of the first battery pack and the first contact end of at least two contact ends of the second switching component.

8. The charging circuit according to claim 1, characterized in that, The charging circuit further includes at least a first converter and a second converter, wherein the first converter is connected to the first battery pack and the second converter is connected to the second battery pack; The first converter is connected to the second converter and is used to balance the first battery pack and the second battery pack.

9. The charging circuit according to claim 8, characterized in that, The first converter is also configured to connect to a low-voltage load so that the first battery pack supplies power to the low-voltage load via the first converter; and / or The second converter is also configured to connect to the low-voltage load so that the second battery pack supplies power to the low-voltage load via the second converter.

10. An electric device, characterized in that, The electric device includes a charging circuit as described in any one of claims 1-9.

11. The electric device according to claim 10, characterized in that, The electric equipment is a vehicle, ship, or aircraft, and the first battery pack and the second battery pack are power batteries.

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