Battery charging circuit, method, device, and storage medium

Abstract

The embodiment of the application provides a battery charging circuit, which is applied to an electric vehicle, and the battery charging circuit comprises: a bidirectional vehicle-mounted charging module; a first loop switch module, which is used for electrically connecting a direct-current charging interface of a charging pile and a first end of the bidirectional vehicle-mounted charging module and electrically connecting a second end of the bidirectional vehicle-mounted charging module and a battery pack of the electric vehicle in a conducting state when the electric vehicle is charged by the charging pile; a second loop switch module, which is used for electrically connecting the direct-current charging interface of the charging pile and the battery pack of the electric vehicle in a conducting state when the electric vehicle is charged by the charging pile; the bidirectional vehicle-mounted charging module is used for boosting a direct-current voltage output by the charging pile to be higher than a preset voltage; and a control module, which is used for controlling the first loop switch module to be conducted or controlling the second loop switch module to be conducted according to the direct-current voltage of the charging pile.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery charging circuit, method, apparatus and storage medium. Background Technology

[0002] With the development of new energy technologies, batteries are being used more and more widely, especially in new energy vehicles. To achieve fast battery charging, new energy vehicle manufacturers have gradually strengthened the construction of battery charging platforms, leading to the emergence of high-voltage charging platforms. However, charging piles compatible with high-voltage platforms are not yet fully widespread; therefore, vehicle batteries need to be compatible with charging piles of various voltage platform specifications available on the market.

[0003] Most existing charging stations are low-voltage platforms, such as 400V, with relatively low output charging voltage. However, current electric vehicles typically use high-voltage systems, such as 800V. To enable high-voltage electric vehicles to connect to low-voltage charging stations, one solution is to install a boost module between the electric vehicle's charging port and the battery pack to increase the charging station's voltage. However, to ensure compatibility with low-voltage charging stations, a separate boost module needs to be installed within the electric vehicle, increasing overall vehicle cost. Furthermore, the additional module also increases the complexity of the battery management system. Summary of the Invention

[0004] This application provides a battery charging circuit, method, device, and storage medium to address the problem of increased costs caused by installing a boost module to increase the voltage of a charging pile in electric vehicles.

[0005] In a first aspect, this application provides a battery charging circuit for use in electric vehicles, the battery charging circuit comprising:

[0006] Two-way vehicle charging module;

[0007] The first circuit switch module is used to electrically connect the DC charging interface of the charging pile to the first end of the bidirectional on-board charging module and the second end of the bidirectional on-board charging module to the battery pack of the electric vehicle when the charging pile is charging the electric vehicle.

[0008] The second circuit switch module is used to electrically connect the DC charging interface of the charging pile to the battery pack of the electric vehicle when the charging pile is charging the electric vehicle in the on state.

[0009] The bidirectional on-board charging module is used to boost the DC voltage output by the charging pile to a level higher than the preset voltage;

[0010] The control module is used to control the first circuit switch module to turn on or the second circuit switch module to turn on based on the DC voltage of the charging pile.

[0011] By using the boost function in the bidirectional on-board charging module to boost the DC voltage of the charging pile, when the electric vehicle is connected to a low-voltage charging platform, the first circuit switch module is activated, allowing the bidirectional on-board charging module to boost the low-voltage DC voltage and charge the battery pack. When the electric vehicle is connected to a high-voltage charging platform, the second circuit switch module is activated, allowing the electric vehicle's battery pack to directly receive high-voltage DC for charging. This eliminates the need for an additional boost module, enabling the electric vehicle to be charged on both high-voltage and low-voltage charging platforms, thus making it compatible with different charging platforms. Furthermore, avoiding the need for an additional boost module reduces the overall cost of the electric vehicle and simplifies the complexity of the battery management system.

[0012] In one optional implementation, the bidirectional on-board charging module includes an AC / DC conversion module and a DC / DC conversion module connected in series, the AC / DC conversion module including a DC boost submodule; the first terminal of the bidirectional on-board charging module is the input terminal or output terminal of the AC / DC conversion module;

[0013] The bidirectional on-board charging module specifically detects the input and output voltages of the AC / DC converter module, and then turns the DC boost submodule of the AC / DC converter module on or off based on these voltages. By detecting the input and output voltages of the AC / DC converter module, the module can control the DC boost submodule to turn on or off depending on whether the AC / DC converter module is connected to the boost circuit, thus achieving compatibility and adaptation of the bidirectional on-board charging module under different topologies.

[0014] In one optional implementation, the input terminal of the AC / DC conversion module is used to connect to the DC charging interface of the charging pile, the output terminal of the AC / DC conversion module is connected to the input terminal of the DC / DC conversion module, and the output terminal of the DC / DC conversion module is connected to the battery pack of the electric vehicle through the first circuit switch module.

[0015] The bidirectional on-board charging module detects the input and output voltages of the AC / DC converter module. When both the input and output voltages are below a preset voltage, the DC-DC boost submodule and the DC / DC converter module sequentially boost the DC voltage. When both the input and output voltages are detected to be below the preset voltages, it can be determined that the AC / DC converter module is connected to the boost circuit, and the DC-DC boost submodule and the DC / DC converter module are controlled to perform two voltage boosts.

[0016] In one optional implementation, the input terminal of the DC / DC conversion module is used to connect to the DC charging interface of the charging pile, the input terminal of the DC / DC conversion module is connected to the output terminal of the AC / DC conversion module, and the output terminal of the DC / DC conversion module is connected to the battery pack of the electric vehicle through the first circuit switch module.

[0017] The bidirectional on-board charging module detects the input and output voltages of the AC / DC converter module. When the input voltage is zero and the output voltage is lower than a preset voltage, the DC / DC converter module boosts the DC voltage. If the input voltage is zero and the output voltage is lower than the preset voltage, it indicates that the AC / DC converter module is not connected to the boost circuit, and the DC / DC converter module can be controlled to perform boosting independently.

[0018] In one optional implementation, the first terminal of the bidirectional on-board charging module is connected to the first terminal of the DC charging interface of the charging pile, and the second terminal of the first terminal of the bidirectional on-board charging module is connected to the second terminal of the DC charging interface of the charging pile. The positive and negative terminals of the first terminal of the bidirectional on-board charging module can be connected to the positive and negative terminals of the DC charging interface respectively to receive the DC voltage output by the DC charging interface.

[0019] In one alternative implementation, the first circuit switch module includes:

[0020] The first contactor connects the first pole of the first end of the bidirectional on-board charging module to the first pole of the DC charging interface of the charging pile.

[0021] The first relay connects the first terminal of the second end of the bidirectional on-board charging module to the first terminal of the battery pack.

[0022] The second relay connects the second terminal of the second end of the bidirectional on-board charging module to the second terminal of the battery pack.

[0023] When the first circuit switch module is turned on, the first contactor, the first relay, and the second relay are closed. By controlling the closing of the corresponding relays and contactors, the first circuit switch module can be turned on, so that the DC voltage output from the DC charging interface can be boosted by the bidirectional on-board charging module to charge the battery pack.

[0024] In one optional implementation, the second circuit switch module includes:

[0025] The second contactor connects the first terminal of the DC charging interface of the charging pile to the first terminal of the battery pack.

[0026] The second relay connects the second terminal of the DC charging interface of the charging pile to the second terminal of the battery pack.

[0027] When the second circuit switch module is turned on, the second contactor and the second relay are closed. By reusing the relay in the first circuit switch module, the number of components in both circuit switch modules can be reduced while enabling the second circuit switch module to turn on, thereby reducing the component cost of electric vehicles.

[0028] Secondly, embodiments of this application provide a battery charging method, applied to a control module of the battery charging circuit described above, the method comprising:

[0029] When the charging station is charging the electric vehicle, obtain the DC voltage output from the DC charging interface of the charging station;

[0030] When the DC voltage is lower than the preset voltage, a boost charging request is sent to the bidirectional on-board charging module, and the first circuit switch module is turned on so that the bidirectional on-board charging module boosts the DC voltage to charge the battery pack.

[0031] When the DC voltage exceeds a preset voltage, the second-circuit switch module is activated to charge the battery pack using the DC voltage. By boosting the DC voltage of the charging station through the boost function in the bidirectional on-board charging module, the battery pack can be charged via the boost function of the first-circuit switch module when the electric vehicle is connected to a low-voltage charging platform, without the need for an additional boost module. When the electric vehicle is connected to a high-voltage charging platform, the battery pack can be directly charged by the second-circuit switch module. The electric vehicle can be charged on both high-voltage and low-voltage charging platforms, making it compatible with different charging platforms. Furthermore, eliminating the need for an additional boost module reduces the overall cost of the electric vehicle and simplifies the complexity of the battery management system.

[0032] Thirdly, embodiments of this application provide a battery charging method, applied to a bidirectional on-board charging module of the battery charging circuit described above, the method comprising:

[0033] Receive boost charging request sent by the control module;

[0034] When the first end of the bidirectional on-board charging module is the input end of the AC / DC conversion module, the DC voltage output from the DC charging interface of the charging pile is sequentially boosted through the DC boost submodule of the AC / DC conversion module and the DC / DC conversion module.

[0035] When the first end of the bidirectional on-board charging module is the output end of the AC / DC conversion module, the DC voltage output from the DC charging interface of the charging pile is boosted through the DC / DC conversion module. By detecting whether the AC / DC conversion module is located in the boost circuit, the bidirectional on-board charging module can enable the DC voltage boosting function of bidirectional on-board charging modules with different topologies, thereby achieving compatibility with bidirectional on-board charging modules with different topologies.

[0036] In one optional implementation, when the first end of the bidirectional on-board charging module is the input end of the AC / DC conversion module, before sequentially boosting the DC voltage output from the DC charging interface of the charging pile through the DC boost submodule of the AC / DC conversion module and the DC / DC conversion module, the method further includes:

[0037] Obtain the input and output voltages of the AC / DC converter module;

[0038] When the input voltage is lower than the preset voltage and the output voltage is lower than the preset voltage, the first terminal of the bidirectional on-board charging module is determined to be the input terminal of the AC / DC conversion module.

[0039] When the input voltage is zero and the output voltage is lower than a preset voltage, the first terminal of the bidirectional on-board charging module is the output terminal of the AC / DC conversion module. When different topologies exist for the bidirectional on-board charging module, the corresponding topology can be determined by detecting the voltage signal, thus enabling adaptation of the bidirectional on-board charging module.

[0040] Fourthly, embodiments of this application provide a battery charging device, which includes: a processor and a memory storing computer program instructions;

[0041] When the processor executes computer program instructions, it enables the battery charging device to perform the battery charging method described above.

[0042] Fifthly, embodiments of this application provide a computer storage medium storing computer program instructions, which, when executed by an electronic device, cause the electronic device to implement the battery charging method described above.

[0043] The battery charging circuit provided in this application embodiment uses a bidirectional on-board charging module to boost the DC voltage of the charging pile. The control module can acquire the DC voltage of the charging pile when it is connected to the charging port of the electric vehicle. When the DC voltage of the charging pile meets the charging voltage requirements of the electric vehicle, the DC charging interface of the charging pile can be directly connected to the battery pack for charging. When the DC voltage of the charging pile does not meet the charging voltage requirements of the electric vehicle, the DC voltage can be boosted using the bidirectional on-board charging module to charge the battery pack. Through the boost function in the bidirectional on-board charging module, the DC voltage can be boosted when it is lower than a preset voltage, thus enabling normal charging of low-voltage charging piles. When the electric vehicle already has a bidirectional on-board charging module, the need for an additional boost module can be avoided, thereby reducing the overall vehicle cost. Furthermore, avoiding an additional module also prevents an increase in the complexity of the battery management system. Attached Figure Description

[0044] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

[0045] Figure 1 A schematic diagram of the module structure of a battery charging circuit provided in an embodiment of this application;

[0046] Figure 2 A schematic diagram of the circuit structure of a battery charging circuit provided in an embodiment of this application;

[0047] Figure 3 A schematic diagram of the circuit structure of a battery charging circuit provided in another embodiment of this application;

[0048] Figure 4 A schematic flowchart of a battery charging method provided in an embodiment of this application;

[0049] Figure 5 A schematic flowchart illustrating a battery charging method provided in another embodiment of this application;

[0050] Figure 6 A schematic flowchart of a battery charging method provided in another embodiment of this application;

[0051] Figure 7 This is a schematic diagram of the structure of a battery charging device provided in an embodiment of this application.

[0052] The accompanying drawings are not drawn to scale.

[0053] The reference numerals in the detailed embodiments are as follows:

[0054] 10. Bidirectional on-board charging module; 11. AC / DC conversion module; 12. DC / DC conversion module; 20. First circuit switch module; 30. Second circuit switch module; 40. Control module; 50. DC charging interface; 60. Battery pack; K1. First contactor; K2. Second contactor; S1. First relay; S2. Second relay. Detailed Implementation

[0055] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0056] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0057] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0058] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0059] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0060] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0061] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0062] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0063] In the field of new energy, power batteries serve as the primary power source for electrical devices (such as vehicles, ships, or spacecraft), while energy storage batteries serve as the charging source for these devices; the importance of both is self-evident. As an example, and not a limitation, in some applications, power batteries can refer to the batteries within electrical devices, and energy storage batteries can refer to the batteries within charging devices. For ease of description, both power batteries and energy storage batteries will be referred to as batteries in the following text.

[0064] Currently, most batteries on the market are rechargeable rechargeable batteries, the most common being lithium batteries, such as lithium-ion batteries or lithium-ion polymer batteries. When a battery is installed in an electrical device, if the remaining battery power is insufficient, it needs to be connected to a charging device to recharge the battery.

[0065] It should be noted that, in order to achieve fast battery charging, the maximum voltage supported by the battery charging platforms is becoming increasingly higher. For example, 800-volt high-voltage charging platforms already exist in current electrical devices. However, the construction of charging equipment is a gradual process of popularization. In a commercial environment, the construction of charging equipment supporting high-voltage charging platforms is far behind the production of electrical devices.

[0066] Therefore, after the electrical device is connected to the charging device, the two devices will match the charging voltage to confirm whether the charging voltage of the charging device is lower than the minimum charging voltage of the battery in the electrical device. When the charging voltage of the charging device is lower than the minimum charging voltage, the charging device cannot charge the electrical device.

[0067] Since early charging stations were mostly low-voltage charging platforms, and these early charging stations were mostly located in urban centers and major traffic nodes, when electric vehicles with high-voltage platforms were driving in areas with high coverage of low-voltage charging platforms, in order to improve the charging convenience of electric vehicles, it was necessary to enable electric vehicles with high-voltage platforms to charge normally on low-voltage charging platforms.

[0068] To address this issue, related technologies incorporate a boost module into the charging device. When the charging device supports a low-voltage charging platform, the boost module amplifies the input charging voltage to a voltage signal compatible with the high-voltage platform before charging the battery. However, this method requires an additional boost module within the electric vehicle to amplify the DC voltage. Adding this extra module not only increases the size of the battery management system but also increases its complexity. Therefore, in related technologies, adding an additional boost module within the electric vehicle to enable compatibility with charging stations across various voltage platforms increases the size and complexity of the internal battery management system.

[0069] To address the aforementioned technical problems, embodiments of this application provide a battery charging circuit, method, apparatus, and storage medium. The battery charging circuit provided in this application embodiment will be described first below.

[0070] Figure 1 A schematic diagram of the module structure of a battery charging circuit according to an embodiment of this application is shown. The battery charging circuit includes a bidirectional on-board charging module 10, a first circuit switch module 20, a second circuit switch module 30, and a control module 40.

[0071] The first circuit switch module 20 can connect the DC charging interface 50 of the charging pile to the first end of the bidirectional on-board charging module 10 and the second end of the bidirectional on-board charging module 10 to the battery pack 60 of the electric vehicle when the charging pile is charging the electric vehicle.

[0072] The second circuit switch module 30 can electrically connect the DC charging interface 50 of the charging pile to the battery pack 60 of the electric vehicle when the charging pile is charging the electric vehicle, in the on state.

[0073] The bidirectional on-board charging module 10 can receive the DC voltage output by the charging pile and boost the DC voltage to a level higher than a preset voltage.

[0074] The control module 40 can detect the DC voltage output by the charging pile when the charging pile is charging the electric vehicle. Based on the magnitude of the DC voltage, it can control the first circuit switch module 20 to turn on or control the second circuit switch module 30 to turn on.

[0075] The aforementioned control module 40 can, after detecting the DC voltage output by the charging pile, control the first circuit switch module 20 or the second circuit switch module 30 to conduct based on whether the DC voltage meets the preset charging conditions of the battery pack 60. For example, the control module 40 can control the second circuit switch module 30 to conduct when the DC voltage meets the preset charging conditions of the battery pack 60; and control the first circuit switch module 20 to conduct when the DC voltage does not meet the preset charging conditions of the battery pack 60. It is understood that the first circuit switch module 20 and the second circuit switch module 30 cannot be conducted simultaneously.

[0076] When the second circuit switch module 30 is turned on, the DC charging interface 50 of the charging pile can directly output DC voltage to charge the battery pack 60 of the electric vehicle.

[0077] When the first circuit switch module 20 is turned on, the DC charging interface 50 of the charging pile is connected to the battery pack 60 of the electric vehicle through the bidirectional on-board charging module 10. After the bidirectional on-board charging module 10 boosts the DC voltage output by the charging pile, it can charge the battery pack 60 through the boosted DC voltage.

[0078] The preset charging condition for the battery pack 60 can be that the DC voltage is greater than the minimum charging voltage of the battery pack 60. That is, when the DC voltage output by the charging pile is lower than the charging voltage of the battery pack 60, the control module 40 can control the DC voltage to be boosted by the bidirectional on-board charging module 10 to generate a DC voltage higher than the preset voltage to charge the battery pack 60. Conversely, when the DC voltage output by the charging pile is higher than the charging voltage of the battery pack 60, the control module 40 can control the DC voltage to directly charge the battery pack 60. For example, the battery pack 60 of the electric vehicle can be an 800V battery pack, and the charging pile can be a high-voltage charging platform or a low-voltage charging platform. When the charging pile is a high-voltage charging platform, the DC voltage output by the charging pile can be 800V, which meets the minimum charging voltage of the battery pack 60, thus enabling direct charging of the battery pack 60. When the charging pile is a low-voltage charging platform, the DC voltage output by the charging pile can be 400V, which does not meet the minimum charging voltage of the battery pack 60, therefore it needs to be boosted before charging the battery pack 60. Understandably, the preset voltage can be set to a value higher than the minimum charging voltage of the battery pack 60, so that the DC voltage boosted by the bidirectional on-board charging module 10 can charge the battery pack 60. For example, the preset voltage can be set to 750V.

[0079] In this embodiment, by providing a bidirectional on-board charging module 10, the control module 40 can determine whether to boost the DC voltage output by the charging pile when charging the battery pack 60. When boosting the DC voltage is required, the control module 40 can control the first circuit switch module 20 to conduct, so that the DC voltage is boosted through the bidirectional on-board charging module 10. When boosting the DC voltage is not required, the control module 40 can control the second circuit switch module 30 to conduct, so that the DC voltage output by the charging pile directly charges the battery pack 60. Since the bidirectional on-board charging module 10 is a pre-installed on-board module inside the electric vehicle... By boosting the DC voltage of the charging pile through the boost function of the bidirectional on-board charging module 10, the battery pack can be charged via the boost DC voltage boosted by the bidirectional on-board charging module 10 when the electric vehicle is connected to a low-voltage charging platform, through the conduction of the first circuit switch module 20. When the electric vehicle is connected to a high-voltage charging platform, the battery pack of the electric vehicle can be directly charged by receiving the DC high voltage through the conduction of the second circuit switch module 30. The electric vehicle can be charged under both high-voltage and low-voltage charging platforms, making it compatible with different charging platforms. Furthermore, not adding an additional boost module can reduce the overall cost of the electric vehicle and reduce the complexity of the battery management system.

[0080] Understandably, a fuse can also be installed in the charging circuit of the battery pack 60. The fuse can blow when the current increases abnormally, thereby disconnecting the charging circuit of the battery pack 60.

[0081] Please refer to Figure 2 and Figure 3 In some embodiments, the bidirectional on-board charging module 10 may include an AC / DC conversion module 11 and a DC / DC conversion module 12 connected in series. The AC / DC conversion module 11 includes a DC boost submodule (not shown), and the first terminal of the bidirectional on-board charging module 10 may be the input terminal or the output terminal of the AC / DC conversion module 11.

[0082] The bidirectional on-board charging module 10 can detect the input voltage and output voltage of the AC / DC conversion module 11, and control the DC boost submodule of the AC / DC conversion module 11 to turn on or off based on the input voltage and output voltage.

[0083] In the bidirectional on-board charging module 10, the DC charging interface 50 of the charging pile can be connected to the input terminal of the AC / DC conversion module 11 or the output terminal of the AC / DC conversion module 11. Figure 2 This shows that the first end of the bidirectional on-board charging module 10 is the input end of the AC / DC conversion module 11. Figure 3 The first end of the bidirectional on-board charging module 10 is shown to be the output end of the AC / DC conversion module 11.

[0084] In order to confirm the topological connection method between the DC charging interface 50 of the charging pile and the bidirectional vehicle charging module 10, the control module 40 needs to detect the input voltage and output voltage of the AC / DC conversion module 11 to determine which method is used to connect the DC charging interface 50 of the charging pile and the bidirectional vehicle charging module 10.

[0085] After the bidirectional on-board charging module 10 detects the input and output voltages of the AC / DC conversion module 11, if it is determined that the DC charging interface 50 of the charging pile is connected to the input of the AC / DC conversion module 11, the DC boost submodule of the AC / DC conversion module 11 can be turned on. After the DC boost submodule performs a first boost, the DC / DC conversion module 12 performs a second boost, ultimately boosting the DC voltage of the charging pile to a DC voltage higher than the preset voltage.

[0086] If it is determined that the DC charging interface 50 of the charging pile is connected to the output terminal of the AC / DC conversion module 11, the DC boost submodule of the AC / DC conversion module 11 can be controlled to be turned off, and the DC voltage of the charging pile can be boosted to a DC voltage higher than the preset voltage only through the DC / DC conversion module 12.

[0087] In bidirectional vehicle charging modules 10 with different topology connection methods, the actual topology of the bidirectional vehicle charging module 10 can be determined by detecting the input voltage and output voltage of the AC / DC conversion module 11, and the DC boost submodule of the AC / DC conversion module 11 can be turned on or off accordingly, thereby adapting to bidirectional vehicle charging modules 10 with different topologies.

[0088] Please refer to Figure 2 In some embodiments, the input terminal of the AC / DC conversion module 11 can be connected to the DC charging interface 50 of the charging pile, the output terminal of the AC / DC conversion module 11 is connected to the input terminal of the DC / DC conversion module 12, and the output terminal of the DC / DC conversion module 12 is connected to the battery pack 60 of the electric vehicle through the first circuit switch module 20.

[0089] After detecting the input and output voltages of the AC / DC conversion module 11, the bidirectional vehicle module can control the DC boost submodule of the AC / DC conversion module 11 to turn on if the input voltage is lower than the preset voltage and the output voltage is lower than the preset voltage. This allows the DC voltage output by the charging pile to be boosted sequentially through the DC boost submodule of the AC / DC conversion module 11 and the DC / DC conversion module 12.

[0090] It is understandable that the condition for the first circuit switch module 20 to be turned on is that the DC voltage output by the charging pile is lower than the minimum charging voltage of the battery pack 60. Since the preset voltage is higher than the minimum charging voltage, the DC voltage output by the charging pile is also lower than the preset fast charging voltage. When the first circuit switch module 20 is turned on, the DC charging interface 50 of the charging pile is connected to the bidirectional on-board charging module 10, allowing the input or output voltage of the AC / DC conversion module 11 to be detected. When both the input and output voltages of the AC / DC conversion module 11 are detected to be lower than the preset voltage, it can be determined that the DC charging interface 50 of the charging pile is connected to the input of the AC / DC conversion module 11. At this time, the DC boost submodule of the AC / DC conversion module 11 can be activated to achieve two voltage boosts through the DC boost submodule and the DC / DC conversion module 12.

[0091] Please refer to Figure 3 In some embodiments, the input terminal of the DC / DC conversion module 12 can be connected to the DC charging interface 50 of the charging pile, the output terminal of the AC / DC conversion module 11 is connected to the input terminal of the DC / DC conversion module 12, and the output terminal of the DC / DC conversion module 12 is connected to the battery pack 60 of the electric vehicle through the first circuit switch module 20.

[0092] After detecting the input and output voltages of the AC / DC conversion module 11, if the input voltage is zero and the output voltage is lower than the preset voltage, the bidirectional vehicle module can shut down the DC boost submodule of the AC / DC conversion module 11 so that the DC voltage output by the charging pile can be boosted separately through the DC / DC conversion module 12.

[0093] Similarly, when the first circuit switch module 20 is turned on, the DC charging interface 50 of the charging pile is connected to the bidirectional on-board charging module 10, so that the input voltage or output voltage of the AC / DC conversion module 11 can be detected. When the input voltage of the AC / DC conversion module 11 is detected to be zero, and the output voltage of the AC / DC conversion module 11, that is, the input voltage of the DC / DC conversion module 12, is lower than the preset voltage, it can be determined that the DC charging interface 50 of the charging pile is connected to the input of the DC / DC conversion module 12. At this time, the DC boost submodule of the AC / DC conversion module 11 can be turned off, and the boost is achieved only through the DC / DC conversion module 12.

[0094] In some embodiments, the first pole of the first end of the bidirectional vehicle charging module 10 is connected to the first pole of the DC charging interface 50 of the charging pile, and the second pole of the first end of the bidirectional vehicle charging module 10 is connected to the second pole of the DC charging interface 50 of the charging pile.

[0095] The DC charging interface 50 of the charging pile includes a positive terminal and a negative terminal, which are respectively connected to the positive terminal and the negative terminal of the first end of the bidirectional vehicle charging module 10 to output DC voltage to the bidirectional vehicle charging module 10. For example, the first terminal of the DC charging interface 50 is positive and the second terminal is negative; the first terminal of the first end of the bidirectional vehicle charging module 10 is positive and the second terminal is negative.

[0096] In some embodiments, the first circuit switch module 20 may include a first contactor K1, a first relay S1, and a second relay S2.

[0097] The first terminal of the bidirectional vehicle charging module 10 can be connected to the first terminal of the DC charging interface 50 of the charging pile through the first contactor K1. The first terminal of the second terminal of the bidirectional vehicle charging module 10 can be connected to the first terminal of the battery pack 60 through the first relay S1. The second terminal of the second terminal of the bidirectional vehicle charging module 10 can be connected to the second terminal of the battery pack 60 through the second relay S2.

[0098] The control module 40 can close the first contactor K1, the first relay S1 and the second relay S2 to enable the first circuit switch module 20 to conduct.

[0099] When the first contactor K1 is closed, the positive and negative terminals of the first end of the bidirectional vehicle charging module 10 are connected to the positive and negative terminals of the DC charging interface 50 of the charging pile, and the bidirectional vehicle charging module 10 can receive the DC voltage output by the DC charging interface 50 of the charging pile.

[0100] When the first relay S1 and the second relay S2 are closed, the positive and negative terminals of the second end of the bidirectional on-board charging module 10 are connected to the positive and negative terminals of the battery pack 60. The bidirectional on-board charging module 10 can boost the DC voltage and output the boosted DC voltage to power the battery pack 60.

[0101] In some embodiments, the second circuit switch module 30 may include a second contactor K2 and a second relay S2. The first terminal of the DC charging interface 50 of the charging pile is connected to the first terminal of the battery pack 60 through the second contactor K2, and the second terminal of the DC charging interface 50 of the charging pile is connected to the second terminal of the battery pack 60 through the second relay S2.

[0102] The control module 40 can close the second contactor K2 and the second relay S2 to enable the second circuit switch module 30 to conduct.

[0103] When the second contactor K2 and the second relay S2 are closed, the positive and negative terminals of the DC charging interface 50 of the charging pile are connected to the positive and negative terminals of the battery pack 60, and the DC voltage output by the DC charging interface 50 of the charging pile can directly charge the battery pack 60. By multiplexing the relays in the first circuit switching module, the second circuit switching module 30 can be turned on while reducing the cost of components.

[0104] This application also provides a battery charging method, applied to the control module of the battery charging circuit in the above embodiments, such as... Figure 4 As shown, the battery charging method includes:

[0105] S410: When the charging station is charging an electric vehicle, it acquires the DC voltage output from the DC charging interface of the charging station.

[0106] S420 sends a boost charging request to the bidirectional vehicle charging module when the DC voltage is lower than the preset voltage, and controls the first circuit switch module to turn on so that the bidirectional vehicle charging module boosts the DC voltage to charge the battery pack.

[0107] S430 controls the second circuit switch module to turn on when the DC voltage is greater than the preset voltage, so as to charge the battery pack through the DC voltage.

[0108] In this embodiment, the control module can detect the DC voltage output by the DC charging interface when the charging pile is charging the electric vehicle. When the DC voltage is greater than a preset voltage, the second circuit switch module can be turned on, allowing the DC charging interface to output DC voltage to the battery pack for charging through the second circuit switch module. When the DC voltage is less than the preset voltage, the first circuit switch module can be turned on, allowing the DC charging interface to connect to the bidirectional on-board charging module through the first circuit switch module, and the battery pack will be charged after the bidirectional on-board charging module boosts the DC voltage. By boosting the DC voltage of the charging pile through the boost function in the bidirectional on-board charging module, without adding an additional boost module, when the electric vehicle is connected to a low-voltage charging platform, the bidirectional on-board charging module can boost the low DC voltage to charge the battery pack through the first circuit switch module; when the electric vehicle is connected to a high-voltage charging platform, the battery pack of the electric vehicle can directly receive high DC voltage for charging through the second circuit switch module. The electric vehicle can be charged under both high-voltage and low-voltage charging platforms, making the electric vehicle suitable for different charging platforms. Furthermore, not adding an extra boost module can reduce the overall cost of electric vehicles and reduce the complexity of the battery management system.

[0109] In the S410, the charging station can be connected to the charging port of the electric vehicle via a charging gun, and output DC voltage to the charging port of the electric vehicle via the DC charging interface of the charging station.

[0110] In the S420, when the DC charging interface of the charging pile outputs a DC voltage, the control module of the battery charging circuit can detect the magnitude of this DC voltage and determine whether it is less than a preset voltage. If the DC voltage is less than the preset voltage, the control module can determine that the charging pile is a low-voltage charging platform. When the electric vehicle is a high-voltage platform, the electric vehicle's battery pack cannot be charged by directly connecting to the DC charging interface of the charging pile. At this time, the control module can send a boost charging request to the bidirectional on-board charging module and control the first-loop switch module to turn on. The bidirectional on-board charging module can be electrically connected to the electric vehicle's battery pack through the first-loop switch module. After receiving the boost charging request, the bidirectional on-board charging module can receive the DC voltage output from the DC charging interface and boost that DC voltage to charge the battery pack.

[0111] In S430, when the control module detects a DC voltage output from the charging pile's DC charging interface, if this DC voltage is greater than a preset voltage, the control module can control the second-loop switch module to turn on. The charging pile's DC charging interface can then be directly connected to the battery pack through this second-loop switch module, outputting a DC voltage to charge the battery pack.

[0112] This application also provides a battery charging method, applied to a bidirectional vehicle-mounted charging module of the battery charging circuit described in the above embodiments, such as... Figure 5 As shown, the battery charging method includes:

[0113] S510 receives a boost charging request sent by the control module;

[0114] When the first end of the bidirectional on-board charging module is the input end of the AC / DC conversion module, the DC voltage output from the DC charging interface of the charging pile is sequentially boosted through the DC boost submodule of the AC / DC conversion module and the DC / DC conversion module.

[0115] When the first end of the S530 bidirectional on-board charging module is the output end of the AC / DC conversion module, the DC voltage output from the DC charging interface of the charging pile is boosted by the DC / DC conversion module.

[0116] In this embodiment, the bidirectional on-board charging module can receive a boost charging request sent by the control module and determine whether the AC / DC conversion module is located within the boost circuit. When the AC / DC conversion module is within the boost circuit, it can control the DC boost submodule of the AC / DC conversion module to turn on, so that the DC voltage is boosted sequentially through the DC boost submodule and the DC / DC conversion module. When the AC / DC conversion module is outside the boost circuit, it can control the DC boost submodule of the AC / DC conversion module to turn off, so that the DC voltage is boosted independently through the DC / DC conversion module. By detecting whether the AC / DC conversion module is within the boost circuit, the bidirectional on-board charging module can enable bidirectional on-board charging modules with different topologies to achieve the DC voltage boosting function, thereby achieving compatibility between bidirectional on-board charging modules with different topologies.

[0117] In the S510, the bidirectional on-board charging module can receive a boost charging request from the control module while powered on. For example, when the vehicle starts, a wake-up signal can be sent to the bidirectional on-board charging module, which can then perform a low-voltage power-on self-test based on this signal. When the bidirectional on-board charging module receives a boost charging request, it can detect its topology to determine whether its first terminal is the input or output of the AC / DC converter module.

[0118] In S520, when the bidirectional on-board charging module determines that its first terminal is the input terminal of the AC / DC conversion module, it indicates that both the AC / DC conversion module and the DC / DC conversion module are located in the boost circuit. At this time, the bidirectional on-board charging module can control the DC boost submodule of the AC / DC conversion module to turn on, so that the DC voltage output from the DC charging interface of the charging pile is sequentially boosted through the DC boost submodule and the DC / DC conversion module. The DC voltage after two boosts is then output to the battery pack for charging.

[0119] In S530, when the bidirectional on-board charging module determines that its first terminal is the output terminal of the AC / DC conversion module, it indicates that only the DC / DC conversion module is located in the boost circuit, and the AC / DC conversion module is not connected to the boost circuit. At this time, the bidirectional on-board charging module can control the DC boost submodule of the AC / DC conversion module to shut down, so as to boost the DC voltage output from the DC charging interface of the charging pile through the DC / DC conversion module. The boosted DC voltage is then output to the battery pack for charging.

[0120] As an optional embodiment, please refer to Figure 6 Before step S520, the following may also be included:

[0121] S610, obtains the input and output voltages of the AC / DC conversion module;

[0122] S620, when the input voltage is lower than the preset voltage and the output voltage is lower than the preset voltage, the first terminal of the bidirectional vehicle charging module is determined to be the input terminal of the AC / DC conversion module;

[0123] S630: When the input voltage is zero and the output voltage is lower than the preset voltage, the first terminal of the bidirectional vehicle charging module is the output terminal of the AC / DC conversion module.

[0124] In this embodiment, the bidirectional on-board charging module can determine whether the AC / DC conversion module is connected to the boost circuit by detecting the input and output voltages of the AC / DC conversion module. When different topologies exist for the bidirectional on-board charging module, the corresponding topology can be determined by detecting the voltage signal, thereby achieving adaptation of the bidirectional on-board charging module.

[0125] In the S610, when the bidirectional on-board charging module receives a boost charging request, it can detect the input and output voltages of the AC / DC conversion module.

[0126] In S620, when the bidirectional vehicle charging module detects voltage at both the input and output terminals of the AC / DC conversion module, and both the input and output voltages are lower than the preset voltage, it can be determined that the topology of the bidirectional vehicle charging module is connected to the DC charging interface through the input terminal of the AC / DC conversion module, that is, the first terminal of the bidirectional vehicle charging module is the input terminal of the AC / DC conversion module.

[0127] In S630, when the bidirectional on-board charging module does not detect voltage at the input terminal of the AC / DC conversion module, but detects voltage at the two output terminals, and the output voltage is lower than the preset voltage, it can be determined that the topology of the bidirectional on-board charging module is connected to the DC charging interface through the input terminal of the DC / DC conversion module, that is, the first terminal of the bidirectional on-board charging module is the output terminal of the AC / DC conversion module.

[0128] Figure 7 A schematic diagram of the hardware structure of the battery charging device provided in an embodiment of this application is shown.

[0129] The battery charging device may include a processor 701 and a memory 702 storing computer program instructions.

[0130] Specifically, the processor 701 may include a central processing unit (CPU), an application-specific integrated circuit (ASIC), or one or more integrated circuits that can be configured to implement the embodiments of this application.

[0131] Memory 702 may include mass storage for data or instructions. For example, and not limitingly, memory 702 may include a hard disk drive (HDD), floppy disk drive, flash memory, optical disk, magneto-optical disk, magnetic tape, or Universal Serial Bus (USB) drive, or a combination of two or more of these. Where appropriate, memory 702 may include removable or non-removable (or fixed) media. Where appropriate, memory 702 may be internal or external to the integrated gateway disaster recovery device. In a particular embodiment, memory 702 is non-volatile solid-state memory.

[0132] Memory may include read-only memory (ROM), random access memory (RAM), disk storage media devices, optical storage media devices, flash memory devices, and electrical, optical, or other physical / tangible memory storage devices. Therefore, typically, memory includes one or more tangible (non-transitory) readable storage media (e.g., memory devices) encoded with software including computer-executable instructions, and when the software is executed (e.g., by one or more processors), it is operable to perform the operations described with reference to the methods according to one aspect of this disclosure.

[0133] The processor 701 reads and executes computer program instructions stored in the memory 702 to implement any of the battery swapping control methods in the above embodiments.

[0134] In one example, the battery charging device may also include a communication interface 703 and a bus 710. As shown in Figure 10, the processor 701, memory 702, and communication interface 703 are connected via the bus 710 and communicate with each other.

[0135] The communication interface 703 is mainly used to realize communication between various modules, devices, units and / or equipment in the embodiments of this application.

[0136] Bus 710 includes hardware, software, or both, that couples components of a battery charging device together. For example, and not limitingly, the bus may include an Accelerated Graphics Port (AGP) or other graphics bus, an Enhanced Industry Standard Architecture (EISA) bus, a Front Side Bus (FSB), HyperTransport (HT) interconnect, an Industry Standard Architecture (ISA) bus, an Infinite Bandwidth Interconnect, a Low Pin Count (LPC) bus, a memory bus, a Microchannel Architecture (MCA) bus, a Peripheral Component Interconnect (PCI) bus, a PCI-Express (PCI-X) bus, a Serial Advanced Technology Attachment (SATA) bus, a Video Electronics Standards Association Local (VLB) bus, or other suitable buses, or combinations of two or more of these. Where appropriate, bus 710 may include one or more buses. Although specific buses are described and illustrated in embodiments of this application, any suitable bus or interconnect is contemplated herein.

[0137] The battery charging device can be based on the battery power supply system described above, thereby realizing the battery swapping control method described in conjunction with Figures 8 to 9.

[0138] Furthermore, in conjunction with the battery swapping control methods in the above embodiments, this application embodiment can provide a computer storage medium for implementation. The computer storage medium stores computer program instructions; when these computer program instructions are executed by a processor, they implement any of the battery swapping control methods in the above embodiments.

[0139] The functional blocks shown in the above-described structural diagram can be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, they can be, for example, electronic circuits, application-specific integrated circuits (ASICs), appropriate firmware, plug-ins, function cards, etc. When implemented in software, the elements of this application are programs or code segments used to perform the required tasks. Programs or code segments can be stored on a machine-readable medium or transmitted over a transmission medium or communication link via data signals carried on a carrier wave. "Machine-readable medium" can include any medium capable of storing or transmitting information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, radio frequency (RF) links, etc. Code segments can be downloaded via computer networks such as the Internet, intranets, etc.

[0140] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0141] This document uses specific examples to illustrate the principles and implementation methods of this application. The examples are merely for the purpose of helping to understand the method and core ideas of this application. The above are only preferred embodiments of this application. It should be noted that due to the limitations of written expression, and the existence of an infinite number of specific structures, those skilled in the art can make several improvements, modifications, or changes without departing from the principles of this application, and can also combine the above technical features in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the concept and technical solution of this application to other situations without modification, should all be considered within the scope of protection of this application.

Claims

1. A battery charging circuit, characterized by, The battery charging circuit, used in electric vehicles, includes: Two-way vehicle charging module; The first circuit switch module includes at least one switch device independent of the bidirectional on-board charging module, which is used to electrically connect the DC charging interface of the charging pile to the first end of the bidirectional on-board charging module and the second end of the bidirectional on-board charging module to the battery pack of the electric vehicle when the charging pile is charging the electric vehicle. The second circuit switch module is used to electrically connect the DC charging interface of the charging pile to the battery pack of the electric vehicle when the charging pile is charging the electric vehicle in the on state. The bidirectional on-board charging module is used to boost the DC voltage output by the charging pile to a level higher than a preset voltage; The control module is used to control the first circuit switch module to turn on or control the second circuit switch module to turn on based on the DC voltage of the charging pile. The bidirectional on-board charging module includes an AC / DC conversion module and a DC / DC conversion module connected in series, and the AC / DC conversion module includes a DC boost submodule; The bidirectional on-board charging module is used to detect the input voltage and output voltage of the AC / DC conversion module, so as to determine the actual topology of the bidirectional on-board charging module based on the input voltage and the output voltage, and then turn the DC boost submodule of the AC / DC conversion module on or off according to the actual topology.

2. The battery charging circuit of claim 1, wherein, The first end of the bidirectional vehicle-mounted charging module is either the input or output end of the AC / DC conversion module.

3. The battery charging circuit of claim 2, wherein, The input terminal of the AC / DC conversion module is used to connect to the DC charging interface of the charging pile, the output terminal of the AC / DC conversion module is connected to the input terminal of the DC / DC conversion module, and the output terminal of the DC / DC conversion module is connected to the battery pack of the electric vehicle through the first circuit switch module. The bidirectional vehicle-mounted charging module is used to detect the input voltage and output voltage of the AC / DC conversion module. When the input voltage is lower than a preset voltage and the output voltage is lower than a preset voltage, the DC voltage is sequentially boosted by the DC boost submodule of the AC / DC conversion module and the DC / DC conversion module.

4. The battery charging circuit of claim 2, wherein, The input terminal of the DC / DC conversion module is used to connect to the DC charging interface of the charging pile, the input terminal of the DC / DC conversion module is connected to the output terminal of the AC / DC conversion module, and the output terminal of the DC / DC conversion module is connected to the battery pack of the electric vehicle through the first circuit switch module. The bidirectional vehicle-mounted charging module is used to detect the input voltage and output voltage of the AC / DC conversion module. When the input voltage is zero and the output voltage is lower than a preset voltage, the DC voltage is boosted by the DC / DC conversion module.

5. The battery charging circuit of claim 1, wherein, The first terminal of the bidirectional vehicle-mounted charging module is connected to the first terminal of the DC charging interface of the charging pile, and the second terminal of the first terminal of the bidirectional vehicle-mounted charging module is connected to the second terminal of the DC charging interface of the charging pile.

6. The battery charging circuit of claim 5, wherein, The first circuit switch module includes: The first contactor connects the first pole of the first end of the bidirectional vehicle-mounted charging module to the first pole of the DC charging interface of the charging pile. The first relay connects the first terminal of the second end of the bidirectional on-board charging module to the first terminal of the battery pack. The second relay connects the second terminal of the second end of the bidirectional on-board charging module to the second terminal of the battery pack. When the first circuit switch module is turned on, the first contactor, the first relay, and the second relay are closed.

7. The battery charging circuit of claim 6, wherein, The second circuit switch module includes: The second contactor connects the first terminal of the DC charging interface of the charging pile to the first terminal of the battery pack. The second relay connects the second terminal of the DC charging interface of the charging pile to the second terminal of the battery pack. When the second circuit switch module is turned on, the second contactor and the second relay are closed.

8. A battery charging method, characterized by, The method, applied to a control module of a battery charging circuit as described in any one of claims 1-7, comprises: When the charging pile is charging an electric vehicle, the DC voltage output by the DC charging interface of the charging pile is obtained; When the DC voltage is less than the preset voltage, a boost charging request is sent to the bidirectional vehicle charging module, and the first circuit switch module is controlled to be turned on, so that the bidirectional vehicle charging module boosts the DC voltage to charge the battery pack. When the DC voltage is greater than the preset voltage, the second circuit switch module is turned on to charge the battery pack using the DC voltage.

9. A method of charging a battery, characterized by, The bidirectional on-board charging module applied to the battery charging circuit as described in any one of claims 1-7, the method comprising: Receive boost charging request sent by the control module; When the first end of the bidirectional on-board charging module is the input end of the AC / DC conversion module, the DC voltage output from the DC charging interface of the charging pile is sequentially boosted by the DC boost submodule of the AC / DC conversion module and the DC / DC conversion module. When the first end of the bidirectional on-board charging module is the output end of the AC / DC conversion module, the DC voltage output by the DC charging interface of the charging pile is boosted by the DC / DC conversion module.

10. The battery charging method of claim 9, wherein, When the first end of the bidirectional on-board charging module is the input end of the AC / DC conversion module, before sequentially boosting the DC voltage output from the DC charging interface of the charging pile through the DC boost submodule of the AC / DC conversion module and the DC / DC conversion module, the method further includes: Obtain the input voltage and output voltage of the AC / DC conversion module; When the input voltage is lower than a preset voltage and the output voltage is lower than a preset voltage, the first terminal of the bidirectional vehicle charging module is determined to be the input terminal of the AC / DC conversion module. When the input voltage is zero and the output voltage is lower than a preset voltage, the first terminal of the bidirectional vehicle charging module is the output terminal of the AC / DC conversion module.

11. A battery charging apparatus, characterized by comprising: The battery charging device includes: a processor and a memory storing computer program instructions; When the processor executes the computer program instructions, it causes the battery charging device to implement the battery charging method as described in any one of claims 8 to 10.

12. A computer storage medium, characterized in that The computer storage medium stores computer program instructions, which, when executed by the electronic device, cause the electronic device to implement the battery charging method as described in any one of claims 8 to 10.

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