Battery topology circuit, vehicle and circuit control method

Abstract

The application provides a battery topology circuit, a vehicle and a circuit control method, and belongs to the technical field of battery management. The battery topology circuit comprises a path switching module and a charging interface, the charging interface is used for connecting a charging device; the path switching module is connected with the charging interface, a battery heating load and a power battery respectively, and is used for switching between at least a first state and a second state, wherein the first state is configured to connect the battery heating load and the charging interface, so that the charging device supplies power to the battery heating load, and the second state is configured to connect the power battery and the charging interface, so that the charging device charges the power battery. The battery topology circuit of the application can realize the heating of the power battery and the fast charging of the power battery, so as to effectively prevent lithium precipitation of the battery at low temperature and improve the safety of the battery.

Description

Technical Field

[0001] This application relates to the field of battery management technology, and in particular to a battery topology circuit, a vehicle, and a circuit control method. Background Technology

[0002] With the rapid development of new energy vehicles, users have higher requirements for charging speed, leading to the emergence of fast charging technology. Under the charging logic of fast charging technology, the charging interface in the vehicle's charging circuit, which connects to the charging station, can be directly connected to the power battery via a fast charging relay. By closing the fast charging relay, the higher charging voltage provided by the charging station can be used to quickly charge the power battery.

[0003] However, when the power battery is in a low-temperature environment, the charging current output by the charging pile will flow directly into the power battery when the fast charging relay is closed, which may lead to the risk of lithium plating at low temperatures and affect the safety of the power battery. Summary of the Invention

[0004] To overcome the problems existing in related technologies, this application provides a battery topology circuit, a vehicle, and a circuit control method.

[0005] According to a first aspect of the present application, a battery topology circuit is provided, the battery topology circuit including: a path switching module and a charging interface, the charging interface being used to connect to a charging device; The path switching module is connected to the charging interface, the battery heating load, and the power battery, respectively, and is used at least to switch between the first state and the second state. The first state is configured to connect the battery heating load and the charging interface so that the charging device supplies power to the battery heating load, and the second state is configured to connect the power battery and the charging interface so that the charging device charges the power battery.

[0006] Optionally, the battery topology circuit further includes: a second switching element; The first end of the second switch is connected to the first terminal of the power battery, and the second end of the second switch is connected to the battery heating load; the path switching module is connected to the charging interface, the first terminal of the power battery, and the target node, respectively. The first state is configured to connect the target node and the charging interface, and the second switch is disconnected when the path switching module is in the first state. The target node is the electrical connection point between the second end of the second switch and the battery heating load.

[0007] Optionally, the path switching module includes: a first connector, a second connector, a third connector, and a rotating component; The rotating component is connected to the first connecting component, the second connecting component, and the third connecting component respectively; the first state is configured to switch the rotating component to a first rotating position, and the second state is configured to switch the rotating component to a second rotating position; When the rotating member is in the first rotational position, the first connecting member connects the charging interface and the target node; when the rotating member is in the second rotational position, the second connecting member connects the charging interface and the first pole of the power battery, and the third connecting member connects the target node and the battery heating load.

[0008] Optionally, the path switching module includes: a third switch and a fourth switch; The third switch is connected to the charging interface and the target node respectively, and the fourth switch is connected to the charging interface and the first pole of the power battery respectively. The first state is configured such that the third switch is closed and the fourth switch is open, and the second state is configured such that the third switch is open and the fourth switch is closed.

[0009] Optionally, the battery topology circuit further includes: a fifth switching element; The first end of the fifth switch is connected to the second terminal of the power battery, the second end of the fifth switch is connected to the second terminal interface of the charging interface, and the first terminal of the power battery is connected to the first terminal interface of the charging interface through the path switching module.

[0010] Optionally, the battery topology circuit further includes: a sixth switching element; The first end of the sixth switch is connected to the first end of the fifth switch and the second terminal of the power battery, and the second end of the sixth switch is connected to the battery heating load. When the path switching module is in the first state, both the fifth and sixth switches are closed; when the path switching module is in the second state, the fifth switch is closed and the sixth switch is open.

[0011] Optionally, the battery topology circuit further includes: a seventh switching element; The first end of the seventh switch is connected to the second pole of the power battery, and the second end of the seventh switch is connected to the first end of the fifth switch and the battery heating load, respectively. The fifth switch and the seventh switch close synchronously.

[0012] Optionally, the battery topology circuit further includes: a first switching element; The path switching module is connected to the first terminal interface of the charging interface through the first switch, and the second terminal interface of the charging interface is connected to the power battery and the battery heating load respectively.

[0013] Optionally, the battery topology circuit further includes: a control module; The control module is connected to the path switching module and is used to detect the ambient temperature of the power battery. When the ambient temperature is lower than the low temperature threshold, the control module switches to the first state. When the ambient temperature is not lower than the low temperature threshold, the control module switches to the second state.

[0014] According to a second aspect of the embodiments of this application, a vehicle is provided, the vehicle comprising: a power battery, and a battery topology circuit as described in any of the first aspects.

[0015] According to a third aspect of the embodiments of this application, a circuit control method is provided, applied to any of the battery topology circuits described in the first aspect, or, in the vehicle described in the second aspect, the method comprising: Detect the ambient temperature of the power battery; When the ambient temperature is below the low temperature threshold, the path switching module is controlled to switch to the first state; When the ambient temperature is not lower than the low temperature threshold, the control module switches to the second state.

[0016] The technical solutions provided by the embodiments of this application bring at least the following beneficial effects: In this embodiment, the battery topology circuit includes a path switching module and a charging interface. The path switching module is connected to the charging interface, a battery heating load, and a power battery, and is used at least to switch between a first state and a second state. Specifically, the first state of the path switching module is configured to connect the battery heating load and the charging interface, so that the charging device supplies power to the battery heating load, enabling the battery heating load to heat the power battery. The second state of the path switching module is configured to connect the power battery and the charging interface, so that the charging device directly charges the power battery, enabling fast charging of the power battery.

[0017] Clearly, the battery topology circuit provided in this application can simultaneously achieve both heating and fast charging of the power battery. Therefore, when the power battery is in a low-temperature environment, the path switching module enters the first state to connect the charging interface to the battery heating load. This allows the battery topology circuit to heat the power battery while preventing the charging device connected to the charging interface from supplying power to the battery, thereby effectively preventing lithium plating at low temperatures and improving battery safety.

[0018] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0019] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application, and do not constitute an undue limitation of this application.

[0020] Figure 1 This is one of the schematic diagrams of the battery topology circuit provided in the embodiments of this application; Figure 2 This is a second schematic diagram of the battery topology circuit provided in the embodiments of this application; Figure 3 This is the third schematic diagram of the battery topology circuit provided in the embodiments of this application; Figure 4 This is the fourth schematic diagram of the battery topology circuit provided in the embodiments of this application; Figure 5 This is the fifth schematic diagram of the battery topology circuit provided in the embodiments of this application; Figure 6 This is one of the enlarged structural schematic diagrams of the path switching module provided in the embodiments of this application; Figure 7 This is the sixth schematic diagram of the battery topology circuit provided in the embodiments of this application; Figure 8 This is a second enlarged schematic diagram of the path switching module provided in the embodiments of this application; Figure 9 This is the seventh schematic diagram of the battery topology circuit provided in the embodiments of this application; Figure 10 This is the eighth schematic diagram of the battery topology circuit provided in the embodiments of this application; Figure 11 This is the ninth schematic diagram of the battery topology circuit provided in the embodiments of this application; Figure 12 This is the tenth schematic diagram of the battery topology circuit provided in the embodiments of this application; Figure 13 This is eleventh of the schematic diagrams of the battery topology circuit provided in the embodiments of this application; Figure 14 This is one of the electrical circuit diagrams of the battery topology circuit provided in the embodiments of this application; Figure 15 This is the second electrical circuit diagram of the battery topology circuit provided in the embodiments of this application; Figure 16This is one of the flowcharts of the circuit control method for the battery topology circuit provided in the embodiments of this application; Figure 17 This is the second flowchart of the circuit control method provided in the embodiments of this application. Detailed Implementation

[0021] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0022] Please refer to Figure 1 This illustrates a schematic diagram of a battery topology circuit provided in an embodiment of this application. Figure 1 As shown, the battery topology circuit 1 includes a path switching module 11 and a charging interface 12. The charging interface 12 is used to connect to the charging device 4. Optionally, the charging device 4 can be a charging pile, a vehicle, or a portable charging device, etc.

[0023] The path switching module 11 is connected to the charging interface 12, the battery heating load 31, and the power battery 2, respectively. The path switching module 11 is used to switch between at least a first state and a second state. Specifically, the first state of the path switching module 11 is configured to connect the battery heating load 31 and the charging interface 12, so that the charging device 4 supplies power to the battery heating load 31. The second state of the path switching module 11 is configured to connect the power battery 2 and the charging interface 12, so that the charging device 4 charges the power battery 2.

[0024] In this embodiment, when the charging interface 12 is connected to the charging device 4, if the path switching module 11 is in the first state, the charging interface 12 and the battery heating load 31 can be connected, so that the charging device 4 forms a circuit loop with the battery heating load 31 through the charging interface 12, and the charging device 4 supplies power to the battery heating load 31 so that the battery heating load 31 heats the power battery 2. If the path switching module 11 is in the second state, the charging interface 12 and the power battery 2 can be connected, so that the charging device 4 forms a circuit loop with the power battery 2 through the charging interface 12, and the charging device 4 supplies power to the power battery 2, so as to realize fast charging of the power battery 2 by utilizing the charging power of the charging device 4.

[0025] In some embodiments, when the ambient temperature of the power battery 2 is not lower than (i.e. equal to or greater than) the low temperature threshold, indicating that the power battery 2 is not in a low temperature environment, the path switching module 11 switches to the second state to connect the charging interface 12 and the power battery 2, so that the charging device 4 can supply power to the power battery 2 independently, thereby realizing fast charging of the power battery 2.

[0026] When the ambient temperature of the power battery 2 is below the low-temperature threshold, indicating that the power battery 2 is in a low-temperature environment, the path switching module 11 switches to the first state to connect the charging interface 12 and the battery heating load 31. This allows the battery heating load 31 to heat the power battery 2 independently, preventing the charging device 4 from supplying power to the power battery 2, thus preventing lithium deposition at low temperatures and improving battery safety. Optionally, when the ambient temperature of the power battery 2 rises due to heating by the battery heating load 31 until it is not lower than the low-temperature threshold, the path switching module 11 can switch from the first state to the second state to switch the connection between the charging interface 12 and the power battery 2, allowing the charging device 4 to directly supply power to the power battery 2, achieving fast charging of the power battery 2.

[0027] For example, the battery topology circuit may also include a control module. The control module is connected to the path switching module 11. The control module is used to detect the ambient temperature of the power battery 2. When the ambient temperature is lower than the low temperature threshold, the control module 11 switches to a first state so that the charging device 4 supplies power to the battery heating load 31 alone. When the ambient temperature is not lower than the low temperature threshold, the control module 11 switches to a second state so that the charging device 4 supplies power to the power battery 2 alone.

[0028] Optionally, the control module may include controllers such as a microcontroller unit (MCU) or a central processing unit (CPU). When the charging device 4 is connected to the charging interface 12, the controller can detect the ambient temperature of the power battery 2 and determine whether the ambient temperature is below a low-temperature threshold to determine if the power battery 2 is in a low-temperature environment. If the ambient temperature of the power battery 2 is below the low-temperature threshold, the controller can control the path switching module 11 to switch to a first state, allowing the battery heating load 31 to heat the power battery 2 independently, and preventing the charging device 4 from supplying power to the power battery 2, thus preventing lithium plating at low temperatures and improving battery safety. If the ambient temperature of the power battery 2 is not below the low-temperature threshold, the controller can control the path switching module 11 to switch to a second state, allowing the charging device 4 to supply power to the power battery 2, achieving fast charging of the power battery 2. Optionally, during the heating process of the power battery 2 by the battery heating load 31, the controller can also detect the ambient temperature of the power battery 2 in real time. When the ambient temperature of the power battery 2 rises until it is not lower than the low temperature threshold, the control path switching module 11 switches from the first state to the second state to switch the connection between the charging interface 12 and the power battery 2, so that the charging device 4 can start supplying power to the power battery 2 for fast charging, ensuring the effective charging of the power battery 2, and effectively balancing the heating and fast charging of the power battery.

[0029] In some embodiments, such as Figure 2 As shown, the battery topology circuit also includes a first switch K1. The path switching module 11 is connected to the first terminal interface of the charging interface 12 via the first switch K1. The second terminal interface of the charging interface 12 is connected to the power battery 2 and the battery heating load 31, respectively. Accordingly, the path switching module 11 is connected to the first switch K1, the battery heating load 31, and the first terminal of the power battery 2, respectively.

[0030] Optionally, the first end of the first switch K1 is connected to the first terminal of the charging interface 12, and the second terminal of the charging interface 12 is connected to the second terminal of the power battery 2 and the battery heating load 31. Correspondingly, the path switching module 11 is connected to the second end of the first switch K1, the battery heating load 31, and the first terminal of the power battery 2. For example, the negative terminal of the charging interface 12 is connected to the negative terminal of the power battery 2 and the battery heating load 31. The path switching module 11 is connected to the second end of the first switch K1, the battery heating load 31, and the positive terminal of the power battery 2. The first end of the first switch K1 is connected to the positive terminal of the charging interface 12.

[0031] In an optional embodiment of this application, when the charging interface 12 is connected to the charging device 4, the first switch K1 can be closed to allow the charging device 4 to supply power to the battery topology circuit. When the first switch K1 is closed, if the path switching module 11 is in the first state, the charging device 4 can supply power to the battery heating load 31 independently, allowing the battery heating load 31 to heat the power battery 2. If the path switching module 11 is in the second state, the charging device 4 can supply power to the power battery 2, enabling fast charging of the power battery 2.

[0032] In some embodiments, when the ambient temperature of the power battery 2 is not lower than (i.e., equal to or greater than) a low-temperature threshold, indicating that the power battery 2 is not in a low-temperature environment, the first switch K1 closes, and the path switching module 11 switches to the second state to achieve fast charging of the power battery 2. When the ambient temperature of the power battery 2 is lower than the low-temperature threshold, indicating that the power battery 2 is in a low-temperature environment, the first switch K1 closes, and the path switching module 11 switches to the first state, so that the battery heating load 31 heats the power battery 2 independently, and avoids the charging device 4 from supplying power to the power battery 2, preventing lithium deposition at low temperatures and improving battery safety. Further optionally, when the ambient temperature of the power battery 2 rises due to heating by the battery heating load 31 until the ambient temperature of the power battery 2 is not lower than the low-temperature threshold, the path switching module 11 can further switch from the first state to the second state to achieve safe fast charging of the power battery 2.

[0033] For example, when the battery topology circuit 1 includes a control module, the control module can be connected to the first switch K1 and the path switching module 11, respectively. The control module is used to detect the ambient temperature of the power battery 2. When the ambient temperature is lower than the low temperature threshold, it controls the first switch K1 to close and controls the path switching module 11 to switch to the first state, so as to connect the charging interface 12 and the battery heating load 31 to enable the charging device 4 to supply power to the battery heating load 31 independently. When the ambient temperature is not lower than the low temperature threshold, it controls the first switch K1 to close and controls the path switching module 11 to switch to the second state, so as to connect the charging interface 12 and the power battery 2 to enable the charging device 4 to charge the power battery 2.

[0034] In some embodiments, the charging interface 12 can be a DC charging interface or an AC charging interface. A DC charging interface refers to a charging interface that transmits direct current. An AC charging interface refers to a charging interface that transmits alternating current. It should be noted that when the charging interface 12 is an AC charging interface, in the battery topology circuit provided in this application embodiment, a rectifier circuit needs to be provided between the charging interface 12 and the power battery 2 to convert the AC power transmitted by the charging interface 12 into DC power to charge the power battery 2.

[0035] In this embodiment, the battery topology circuit includes a path switching module and a charging interface. The path switching module is connected to the charging interface, a battery heating load, and a power battery, and is used at least to switch between a first state and a second state. Specifically, the first state of the path switching module is configured to connect the battery heating load and the charging interface, so that the charging device supplies power to the battery heating load, enabling the battery heating load to heat the power battery. The second state of the path switching module is configured to connect the power battery and the charging interface, so that the charging device directly charges the power battery, enabling fast charging of the power battery.

[0036] Clearly, the battery topology circuit provided in this application can simultaneously achieve both heating and fast charging of the power battery. Therefore, when the power battery is in a low-temperature environment, the path switching module enters the first state to connect the charging interface to the battery heating load. This allows the battery topology circuit to heat the power battery while preventing the charging device connected to the charging interface from supplying power to the battery, thereby effectively preventing lithium plating at low temperatures and improving battery safety.

[0037] In some embodiments of this application, such as Figure 3 As shown, the battery topology circuit 1 further includes a second switch K2. The first end of the second switch K2 is connected to the first terminal of the power battery 2, and the second end of the second switch K2 is connected to the battery heating load 31. The second switch K2 is used to connect or disconnect the power battery 2 from the battery heating load 31. Optionally, the battery heating load 31 can be located within the vehicle load 3. Correspondingly, the second end of the second switch K2 can be connected to the vehicle load 3 to achieve connection with the battery heating load 31.

[0038] The path switching module 11 is connected to the battery heating load 31, the first terminal of the power battery 2, and the target node O. In its first state, the path switching module 11 is configured to connect the target node O and the charging interface 12, thereby connecting the battery heating load 31 and the charging interface 12, allowing the charging device 4 to supply power to the battery heating load 31. In its second state, the path switching module 11 is configured to connect the power battery 2 and the charging interface 12, allowing the charging device 4 to charge the power battery 2. The target node O is the electrical connection point between the second terminal of the second switch K2 and the battery heating load 31. The second switch K2 is disconnected when the path switching module 11 is in its first state. Optionally, the second switch K2 can also be disconnected when the path switching module 11 is in its second state.

[0039] In an optional embodiment of this application, when the path switching module 11 is connected to the first pole of the power battery 2, the target node O and the charging interface 12 respectively, the path switching module 11 can switch between a first state and a second state to switch the connection between the charging interface 12 and the target node O, so as to connect the charging interface 12 and the battery heating load 31; or, the path switching module 11 is used to switch the connection between the charging interface 12 and the first pole of the power battery 2.

[0040] When the charging interface 12 is connected to the charging device 4, if the second switch K2 is disconnected and the path switching module 11 switches to the first state to connect the charging interface 12 and the target node O, the charging device 4 forms a circuit loop with the battery heating load 31 through the charging interface 12. The charging device 4 supplies power to the battery heating load 31 separately, so that the battery heating load 31 heats the power battery 2. Furthermore, disconnecting the second switch K2 can further ensure a complete physical disconnection between the charging device 4 connected to the charging interface 12 and the power battery 2, thereby effectively preventing the output current of the charging device 4 from flowing into the cell of the power battery 2 through the second switch K2 in this case.

[0041] In some embodiments, when the ambient temperature of the power battery 2 is not lower than the low temperature threshold, indicating that the power battery 2 is not in a low temperature environment, the second switch K2 is disconnected, and the path switching module 11 switches to the second state, which allows the charging device 4 to supply power to the power battery 2, thereby realizing fast charging of the power battery 2.

[0042] When the ambient temperature of the power battery 2 is lower than the low temperature threshold, indicating that the power battery 2 is in a low temperature environment, the second switch K2 is disconnected, and the path switching module 11 switches to the first state, which allows the battery heating load 31 to heat the power battery 2. The second switch K2 is then disconnected to further and effectively ensure a complete physical disconnection between the charging device 4 connected to the charging interface 12 and the power battery 2. This prevents the output current of the charging device 4 from flowing into the power battery 2 through the second switch K2 in the low temperature environment of the battery, prevents lithium deposition at low temperatures, and improves the safety of battery use.

[0043] For example, in a battery topology circuit including a control module and a first switch K1, the control module is connected to the first switch K1 and the path switching module 11, and also to the second switch K2. The control module detects the ambient temperature of the power battery 2. When the ambient temperature is below a low-temperature threshold, it controls the first switch K1 to close, the second switch K2 to open, and controls the path switching module 11 to switch to a first state to connect the charging interface 12 to the battery heating load 31. When the ambient temperature is not lower than the low-temperature threshold, it controls the first switch K1 to close, the second switch K2 to open, and controls the path switching module 11 to switch to a second state to connect the charging interface 12 to the power battery 2.

[0044] Further optional, such as Figure 4 As shown, the path switching module 11 is also connected to the battery heating load 31. The second state of the path switching module 11 is configured to connect the power battery 2 and the charging interface 12, and to connect the target node O and the battery heating load 31.

[0045] In this optional embodiment, the path switching module 11 is connected to the first terminal of the power battery 2, the target node O, the charging interface 12, and the battery heating load 31, respectively. When the charging interface 12 is connected to the charging device 4, the second switch K2 is disconnected. If the path switching module 11 switches to the first state to connect the charging interface 12 and the target node O, the charging device 4 forms a circuit loop with the battery heating load 31 through the charging interface 12, and the charging device 4 supplies power to the battery heating load 31 to heat the power battery 2. If the path switching module 11 switches to the second state to connect the charging interface 12 and the first terminal of the power battery 2, and connect the target node O and the battery heating load 31, the charging device 4 forms a circuit loop with the power battery 2 through the charging interface 12, and the charging device 4 supplies power to the power battery 2 to achieve fast charging of the power battery 2. In this configuration, when the path switching module 11 connects the charging interface 12 to the first pole of the power battery 2, the target node O and the battery heating load 31 are simultaneously connected, effectively preventing the connection port between the path switching module 11 and the target node O from being left unconnected, thereby effectively ensuring the stability and reliability of the circuit.

[0046] It should be noted that the circuit structure of the path switching module 11 in this application embodiment can be of various types. Two examples are given below for illustrative purposes.

[0047] In the first alternative case, such as Figures 5 to 8 As shown, the path switching module 11 includes a first connector 111, a second connector 112, a third connector 113, and a rotating component (…). Figure 5 and Figure 6(Not shown in the diagram). The rotating component is connected to the first connecting component 111, the second connecting component 112, and the third connecting component 113, respectively. The rotating component is used to switch between a first rotating position and a second rotating position. Specifically, the first state of the path switching module 11 is configured so that the rotating component switches to the first rotating position. The second state of the path switching module 11 is configured so that the rotating component switches to the second rotating position.

[0048] Specifically, when the rotating component is in the first rotational position, the first connecting member 111 connects the charging interface 12 to the target node O. When the rotating component is in the second rotational position, the second connecting member 112 connects the charging interface 12 to the first terminal of the power battery 2, and the third connecting member 113 connects the target node O to the battery heating load 31. That is, when the path switching module 11 is switched to the first state, the rotating component is in the first rotational position. When the path switching module 11 is switched to the second state, the rotating component is in the second rotational position.

[0049] In this optional embodiment, when the charging interface 12 is connected to the charging device 4, the second switch K2 is disconnected. For example... Figure 5 and Figure 6 As shown, if the path switching module 11 switches to the first state, that is, the rotating part switches to the first rotating position, the charging interface 12 can be connected to the target node O through the first connector 111. The charging device 4 forms a circuit loop with the battery heating load 31 through the charging interface 12. The charging device 4 supplies power to the battery heating load 31 separately so that the battery heating load 31 heats the power battery 2. Figure 7 and Figure 8 As shown, if the path switching module 11 switches to the second state, that is, the rotating part switches to the second rotating position, the charging interface 12 can be connected to the first pole of the power battery 2 through the second connector 112, and the target node O is connected to the battery heating load 31 through the third connector 113. Then the charging device 4 forms a circuit loop with the power battery 2 through the charging interface 12, and the charging device 4 supplies power to the power battery 2 to realize fast charging of the power battery 2.

[0050] For example, in a battery topology circuit including a control module and a first switch K1, the control module can be connected to the first switch K1, the second switch K2, and the rotating component in the path switching module 11. The control module detects the ambient temperature of the power battery 2. When the ambient temperature is below a low-temperature threshold, it controls the first switch K1 to close, the second switch K2 to open, and controls the rotating component in the path switching module 11 to switch to a first rotational position so that the battery heating load 31 heats the power battery 2. When the ambient temperature is not lower than the low-temperature threshold, it controls the first switch K1 to close, the second switch K2 to open, and controls the rotating component in the path switching module 11 to switch to a second rotational position so that the charging device 4 provides fast charging for the power battery 2.

[0051] In this optional embodiment, the path switching module 11 includes a first connector 111, a second connector 112, a third connector 113, and a rotating member. The path switching module can switch between a first rotation position and a second rotation position by "rotating" the rotating member, thereby realizing the state switching of the path switching module and achieving efficient switching of electrical connection loops in the battery topology circuit, so as to achieve the purpose of rapid switching between battery heating function and battery fast charging function of the battery topology circuit.

[0052] In the second alternative scenario, such as Figure 9 As shown, the path switching module 11 may include a third switch K3 and a fourth switch K4. The third switch K3 is connected to the charging interface 12 and the target node O, respectively. The fourth switch K4 is connected to the charging interface 12 and the first terminal of the power battery 2, respectively.

[0053] In this configuration, the third switch K3 and the fourth switch K4 are mutually exclusive in their closure. That is, the fourth switch K4 is open when the third switch K3 is closed, and closed when the third switch K3 is open. Specifically, the first state of the path switching module 11 is configured such that the third switch K3 is closed and the fourth switch K4 is open. The second state of the path switching module 11 is configured such that the third switch K3 is open and the fourth switch K4 is closed. That is, in the path switching module 11, closing the third switch K3 and opening the fourth switch K4 causes the path switching module 11 to enter the first state, connecting the charging interface 12 to the target node O; opening the third switch K3 and closing the fourth switch K4 causes the path switching module 11 to enter the second state, connecting the charging interface 12 to the first terminal of the power battery 2.

[0054] In this optional embodiment, when the charging interface 12 is connected to the charging device 4, the second switch K2 can be disconnected, the third switch K3 closed, and the fourth switch K4 disconnected, so that the charging interface 12 is connected to the target node O. The charging device 4 forms a circuit loop with the battery heating load 31 through the charging interface 12, and the charging device 4 supplies power to the battery heating load 31 alone, so that the battery heating load 31 heats the power battery 2. Alternatively, when the charging interface 12 is connected to the charging device 4, the second switch K2 can be disconnected, the third switch K3 disconnected, and the fourth switch K4 closed, so that the charging interface 12 is connected to the first terminal of the power battery 2 through the second connector 112. The charging device 4 forms a circuit loop with the power battery 2 through the charging interface 12, and the charging device 4 supplies power to the power battery 2 to achieve fast charging of the power battery 2.

[0055] For example, in the case where the battery topology circuit includes a control module and a first switch K1, the control module can be connected to the first switch K1, the second switch K2, the third switch K3, and the fourth switch K4. The control module is used to detect the ambient temperature of the power battery 2. When the ambient temperature is lower than the low temperature threshold, it controls the first switch K1 to close, the second switch K2 to open, the third switch K3 to close, and the fourth switch K4 to open, so that the battery heating load 31 heats the power battery 2 alone. When the ambient temperature is not lower than the low temperature threshold, it controls the first switch K1 to close, the second switch K2 to open, the third switch K3 to open, and the fourth switch K4 to close, so that the charging device 4 provides fast charging for the power battery 2.

[0056] In this optional embodiment, the path switching module 11 can be composed of a third switch K3 and a fourth switch K4, which can simply and efficiently switch the electrical connection loops in the battery topology circuit through the two switches, thereby realizing the rapid switching of the battery topology circuit between battery heating function and battery fast charging function. Obviously, the path switching module 11 has the characteristics of simple structure and high loop switching efficiency.

[0057] In a third alternative configuration, the path switching module 11 may include a multiplexer switch. A first terminal of the multiplexer switch is connected to the charging interface 12, a second terminal of the multiplexer switch is connected to the target node O, and a third terminal of the multiplexer switch is connected to the first terminal of the power battery 2. The multiplexer switch is used to switch between a first gear and a second gear, thereby allowing the path switching module 11 to switch between a first state and a second state.

[0058] When the multiplexer switch is in the first position, its first and second terminals are connected to connect the charging interface 12 to the target node O. When the multiplexer switch is in the second position, its first and third terminals are connected to connect the charging interface 12 to the first terminal of the power battery 2. Optionally, the multiplexer switch can be a single-pole double-throw switch, a DIP switch, or a switching switch composed of multiple relays or solid-state switches.

[0059] In this optional embodiment, when the charging interface 12 is connected to the charging device 4, the second switch K2 can be disconnected, and the multiplexer can be switched to the first position, allowing the charging device 4 to supply power to the battery heating load 31 independently, so that the battery heating load 31 heats the power battery 2. Alternatively, when the charging interface 12 is connected to the charging device 4, the second switch K2 can be disconnected, and the multiplexer can be switched to the second position, allowing the charging device 4 to supply power to the power battery 2, thereby achieving fast charging of the power battery 2.

[0060] For example, in a battery topology circuit including a control module and a first switch K1, the control module can be connected to the first switch K1, the second switch K2, and a multiplexer. The control module is used to detect the ambient temperature of the power battery 2. When the ambient temperature is below a low temperature threshold, it controls the first switch K1 to close, the second switch K2 to open, and the multiplexer to switch to the first position, so that the battery heating load 31 heats the power battery 2 alone. When the ambient temperature is not lower than the low temperature threshold, it controls the first switch K1 to close, the second switch K2 to open, and the multiplexer to switch to the second position, so that the charging device 4 provides fast charging for the power battery 2.

[0061] In some embodiments of this application, such as Figure 10 As shown, the battery topology circuit 1 also includes a fifth switch K5. The first end of the fifth switch K5 is connected to the second terminal of the power battery 2, and the second end of the fifth switch K5 is connected to the second terminal interface of the charging interface 12. The first terminal of the power battery 2 is connected to the first terminal interface of the charging interface 12 via the path switching module 11. The fifth switch K5 is used to connect or disconnect the second terminal interface of the charging interface 12 from the power battery 2.

[0062] In this optional embodiment, when the charging interface 12 is connected to the charging device 4, the fifth switch K5 is closed to allow the charging device 4 to supply power to the battery topology circuit. Furthermore, when the fifth switch K5 is closed, if the path switching module 11 switches to the first state to connect the charging interface 12 and the battery heating load 31, the charging device 4 forms a circuit loop with the battery heating load 31 through the charging interface 12, and the charging device 4 supplies power to the battery heating load 31 alone, so that the battery heating load 31 heats the power battery 2. If the path switching module 11 switches to the second state to connect the charging interface 12 and the first terminal of the power battery 2, the charging device 4 forms a circuit loop with the power battery 2 through the charging interface 12, and the charging device 4 supplies power to the power battery 2, achieving fast charging of the power battery 2.

[0063] For example, in a battery topology circuit including a control module and a first switch K1, the control module can be connected to the first switch K1, the fifth switch K5, and the path switching module 11. The control module detects the ambient temperature of the power battery 2. When the ambient temperature is below a low-temperature threshold, it controls the first switch K1 to close, the fifth switch K5 to close, and controls the path switching module 11 to switch to a first state to connect the charging interface 12 with the battery heating load 31, so that the battery heating load 31 heats the power battery 2. When the ambient temperature is not lower than the low-temperature threshold, it controls the first switch K1 to close, the fifth switch K5 to close, and controls the path switching module 11 to switch to a second state to connect the charging interface 12 with the power battery 2, so that the charging device 4 provides fast charging for the power battery 2.

[0064] In this optional embodiment, based on the first switch K1 provided between the first terminal of the power battery 2 and the first terminal interface of the charging interface 12, a fifth switch K5 is added between the second terminal of the power battery 2 and the second terminal interface of the charging interface 12. This allows for the simultaneous addition of switches between the two terminals of the power battery 2 and the two terminals of the charging interface 12. Thus, when both the first switch K1 and the fifth switch K5 are disconnected, a complete physical disconnection between the power battery 2 and the charging interface 12 is achieved. Compared to only providing the first switch K1 and disconnecting it to achieve a logical disconnection between the power battery 2 and the charging interface 12, ensuring a complete physical disconnection between the power battery 2 and the charging interface 12 improves the stability and reliability of circuit switching. This enables stable switching of the battery topology circuit between battery heating and battery fast charging functions, ensuring optimal circuit operation.

[0065] In some embodiments of this application, such as Figure 11As shown, the battery topology circuit 1 also includes a sixth switch K6. The first end of the sixth switch K6 is connected to the first end of the fifth switch K5 and the second terminal of the power battery 2, respectively, and the second end of the sixth switch is connected to the battery heating load 31.

[0066] In the first state, when the circuit switching module 11 is in the first state, both the fifth switch K5 and the sixth switch K6 are closed, allowing the charging device 4 to form a circuit loop with the battery heating load 31 through the charging interface 12. The charging device 4 then supplies power to the battery heating load 31, enabling the battery heating load 31 to heat the power battery 2. In the second state, when the circuit switching module 11 is in the second state, the fifth switch K5 is closed and the sixth switch K6 is open, allowing the charging device 4 to form a circuit loop with the power battery 2 through the charging interface 12. The charging device 4 then supplies power to the power battery 2, enabling fast charging of the power battery 2.

[0067] For example, in a battery topology circuit including a control module and a first switch K1, the control module can be connected to the first switch K1, the fifth switch K5, the sixth switch K6, and the path switching module 11. The control module detects the ambient temperature of the power battery 2. When the ambient temperature is below a low-temperature threshold, it controls the first switch K1 to close, the fifth switch K5 to close, and the sixth switch K6 to close, and controls the path switching module 11 to switch to a first state to connect the charging interface 12 with the battery heating load 31, so that the battery heating load 31 heats the power battery 2. When the ambient temperature is not lower than the low-temperature threshold, it controls the first switch K1 to close, the fifth switch K5 to close, and the sixth switch K6 to open, and controls the path switching module 11 to switch to a second state to connect the charging interface 12 with the power battery 2, so that the charging device 4 provides fast charging for the power battery 2.

[0068] In this optional embodiment, the fifth switch K5 and the sixth switch K6 share a common terminal connected to the power battery 2. Therefore, the fifth switch K5 and the sixth switch K6 can be considered as a parallel high-voltage power distribution architecture under fast charging logic. Furthermore, since the output power of the charging device 4 is typically much greater than the output power of the power battery 2, and there is no need to close the sixth switch K6 during the process of the charging device 4 supplying power to the power battery 2, the fifth switch K5 and the sixth switch K6 do not need to use the same specification to both carry the larger circuit power. Compared to the fifth switch K5, the sixth switch K6 can use a lower specification switch, reducing circuit costs.

[0069] In other embodiments of this application, such as Figure 12As shown, the battery topology circuit 1 also includes a seventh switch K7. The first terminal of the seventh switch K7 is connected to the second terminal of the power battery 2, and the second terminal of the seventh switch K7 is connected to the first terminal of the fifth switch K5 and the battery heating load 31, respectively. The fifth switch K5 and the seventh switch K7 close synchronously.

[0070] In this optional embodiment, when the path switching module 11 is in the first state and the second state, the fifth switch K5 and the seventh switch K7 need to be closed synchronously so that the charging device 4 and the battery topology circuit form different electrical connection circuits, thereby achieving both heating of the power battery and fast charging of the power battery.

[0071] Optionally, when the charging interface 12 is connected to the charging device 4, the fifth switch K5 and the seventh switch K7 are closed to allow the charging device 4 to supply power to the battery topology circuit. Furthermore, when both the fifth switch K5 and the seventh switch K7 are closed, if the path switching module 11 switches to the first state to connect the charging interface 12 and the battery heating load 31, the charging device 4 forms a circuit loop with the battery heating load 31 through the charging interface 12, and the charging device 4 supplies power to the battery heating load 31 alone, allowing the battery heating load 31 to heat the power battery 2. If the path switching module 11 switches to the second state to connect the charging interface 12 and the first terminal of the power battery 2, the charging device 4 forms a circuit loop with the power battery 2 through the charging interface 12, and the charging device 4 supplies power to the power battery 2, achieving fast charging of the power battery 2.

[0072] For example, in a battery topology circuit including a control module and a first switch K1, the control module can be connected to the first switch K1, the fifth switch K5, the seventh switch K7, and the path switching module 11. The control module detects the ambient temperature of the power battery 2. When the ambient temperature is below a low-temperature threshold, it controls the first switch K1 to close, the fifth switch K5 to close, and the seventh switch K7 to close, and controls the path switching module 11 to switch to a first state to connect the charging interface 12 and the battery heating load 31, so that the battery heating load 31 heats the power battery 2. When the ambient temperature is not lower than the low-temperature threshold, it controls the first switch K1 to close, the fifth switch K5 to close, and the seventh switch K7 to close, and controls the path switching module 11 to switch to a second state to connect the charging interface 12 and the power battery 2, so that the charging device 4 provides fast charging for the power battery 2.

[0073] In this optional embodiment, the seventh switch K7 is connected to the power battery 2 through the fifth switch K5. Therefore, the fifth switch K5 and the seventh switch K7 constitute a series high-voltage power distribution architecture under the fast charging logic. This allows the battery topology circuit to achieve both heating and fast charging of the power battery, while enriching the circuit connection methods and ensuring the flexibility of the circuit structure.

[0074] It should be noted that in some embodiments, the switching components in the battery topology circuit (such as one or more of the first switching component K1 to the seventh switching component K7) can be relays, or solid-state switches such as Metal Oxide Semiconductor Field Effect Transistors (MOS) and Insulated-Gate Bipolar Transistors (IGBTs), or mechanical switches such as push-button switches and push-pull switches, or mechanical electronic switches composed of mechanical switches and corresponding electronic control components. This application does not limit the specific type of switch. In a mechanical electronic switch, the mechanical switch acts as an actuating component controlled by its corresponding electronic control component to achieve gear switching.

[0075] In this embodiment, the battery topology circuit includes a path switching module and a charging interface. The path switching module is connected to the charging interface, a battery heating load, and a power battery, and is used at least to switch between a first state and a second state. Specifically, the first state of the path switching module is configured to connect the battery heating load and the charging interface, so that the charging device supplies power to the battery heating load, enabling the battery heating load to heat the power battery. The second state of the path switching module is configured to connect the power battery and the charging interface, so that the charging device directly charges the power battery, enabling fast charging of the power battery.

[0076] Clearly, the battery topology circuit provided in this application can simultaneously achieve both heating and fast charging of the power battery. Therefore, when the power battery is in a low-temperature environment, the path switching module enters the first state to connect the charging interface to the battery heating load. This allows the battery topology circuit to heat the power battery while preventing the charging device connected to the charging interface from supplying power to the battery, thereby effectively preventing lithium plating at low temperatures and improving battery safety.

[0077] To facilitate a better understanding of the technical solutions of this application, the following examples provide further illustrative descriptions of the battery topology circuits provided in the embodiments of this application. For instance... Figure 13As shown, the battery topology circuit includes: a first switch K1, a path switching module 11, a charging interface 12, a second switch K2, a fifth switch K5, a sixth switch K6, and a controller module.

[0078] Specifically, the first end of the first switch K1 is connected to the positive terminal (i.e., the first pole) of the charging interface 12, and the first end of the first switch K1 is also connected to the path switching module 11. The first end of the second switch K2 is connected to the positive terminal (i.e., the first pole) of the power battery 2, and the second end of the second switch K2 is connected to the battery heating load 31. The path switching module 11 is also connected to the target node O, the positive terminal (i.e., the first pole) of the power battery 2, and the battery heating load 31, respectively.

[0079] The first end of the fifth switch K5 is connected to the negative terminal (i.e., the second terminal) of the power battery 2, and the second end of the fifth switch K5 is connected to the negative terminal interface (i.e., the second terminal interface) of the charging interface 12. The first end of the sixth switch K6 is connected to both the first end of the fifth switch K5 and the negative terminal (i.e., the second terminal) of the power battery 2, and the second end of the sixth switch K6 is connected to the battery heating load 31. The battery heating load 31 is included. The path switching module 11 includes a first connector 111, a second connector 112, a third connector 113, and a rotating component. When the rotating component is in the first rotation position, the first connector 111 connects the second end of the first switch K1 to the target node O. When the rotating component is in the second rotation position, the second connector 112 connects the second end of the first switch K1 to the positive terminal (i.e., the first terminal) of the power battery 2, and the third connector 113 connects the target node O to the battery heating load 31.

[0080] The control module is connected to the first switch K1, the second switch K2, the fifth switch K5, the sixth switch K6, and the rotating component in the path switching module 11. The control module is used to detect the ambient temperature of the power battery 2 when the charging interface 12 is connected to the charging pile 4. If the ambient temperature is below a low-temperature threshold, such as... Figure 14 As shown, the control module closes the first switch K1, opens the second switch K2, closes the fifth switch K5, and closes the sixth switch K6. It also controls the rotating component to switch to the first rotating position, connecting the second end of the first switch K1 to the battery heating load 31 via the first connector 111. This allows the charging pile 4 to form a circuit loop with the battery heating load 31 through the charging interface 12 using the first connector 111. The charging pile 4 supplies power to the battery heating load 31 independently, enabling the battery heating load 31 to heat the power battery 2. The control module is also used when the ambient temperature is not lower than a low-temperature threshold, such as... Figure 15As shown, the first switch K1 is closed, the second switch K2 is open, the fifth switch K5 is closed, and the sixth switch K6 is open. The rotating component is also controlled to switch to the second rotating position to connect the second end of the first switch K1 with the first pole of the power battery 2. This allows the charging pile 4 to form a circuit with the power battery 2 through the charging interface 12 and the second connector 112. The charging pile 4 then charges the power battery 2 to achieve fast charging of the power battery 2.

[0081] Furthermore, in some embodiments, the battery topology circuit 1 is located within the vehicle. The charging device is a charging station. For example... Figure 16 As shown, the control module is used to detect the ambient temperature of the power battery 2 through the BMS of the power battery 2 when the charging interface 12 is connected to the charging pile 4, that is, when the vehicle user inserts the charging gun of the charging pile into the vehicle, and to determine whether the ambient temperature of the power battery 2 is lower than the low temperature threshold (also known as the fast charging temperature), so as to determine whether the power battery 2 is in a low temperature state.

[0082] The control module is also used to control the battery topology circuit 1 to enter mode one when the ambient temperature of the power battery 2 is lower than the low temperature threshold. This involves closing the first switch K1, opening the second switch K2, closing the fifth switch K5, and closing the sixth switch K6. It also controls the rotating component to switch to the first rotation position, allowing the charging pile 4 to supply power to the battery heating load 31 alone. This heats the power battery 2 until the ambient temperature of the power battery 2 reaches the low temperature threshold. Then, a charging pause command is sent to the charging pile to stop outputting charging current to the vehicle. Subsequently, the battery topology circuit 1 is switched to mode two, where the first switch K1 is closed, the second switch K2 is open, the fifth switch K5 is closed, and the sixth switch K6 is open. The rotating component is then switched to the second rotation position, and a fast charging command is sent to the charging pile to output fast charging current to the vehicle, enabling the charging pile 4 to charge the power battery 2 and achieve fast charging.

[0083] The control module is also used to control the battery topology circuit 1 to switch to mode two when the ambient temperature of the power battery 2 is not lower than the low temperature threshold. That is, to control the first switch K1 to close, the second switch K2 to open, the fifth switch K5 to close, and the sixth switch K6 to open, and to control the rotating component to switch to the second rotating position so that the charging pile 4 can charge the power battery 2 and realize fast charging of the power battery 2.

[0084] In this embodiment, the battery topology circuit includes a path switching module and a charging interface. The path switching module is connected to the charging interface, a battery heating load, and a power battery, and is used at least to switch between a first state and a second state. Specifically, the first state of the path switching module is configured to connect the battery heating load and the charging interface, so that the charging device supplies power to the battery heating load, enabling the battery heating load to heat the power battery. The second state of the path switching module is configured to connect the power battery and the charging interface, so that the charging device directly charges the power battery, enabling fast charging of the power battery.

[0085] Clearly, the battery topology circuit provided in this application can simultaneously achieve both heating and fast charging of the power battery. Therefore, when the power battery is in a low-temperature environment, the path switching module enters the first state to connect the charging interface to the battery heating load. This allows the battery topology circuit to heat the power battery while preventing the charging device connected to the charging interface from supplying power to the battery, thereby effectively preventing lithium plating at low temperatures and improving battery safety.

[0086] This application also provides a vehicle. The vehicle includes a power battery 2 and any of the battery topology circuits provided in this application embodiment. In the vehicle provided in this application embodiment, the battery topology circuit includes a path switching module and a charging interface. The path switching module is connected to the charging interface, a battery heating load, and the power battery, and is used at least to switch between a first state and a second state. Specifically, the first state of the path switching module is configured to connect the battery heating load and the charging interface, so that the charging device supplies power to the battery heating load, enabling the battery heating load to heat the power battery. The second state of the path switching module is configured to connect the power battery and the charging interface, so that the charging device directly charges the power battery, enabling fast charging of the power battery.

[0087] Clearly, the battery topology circuit provided in this application can simultaneously achieve both heating and fast charging of the power battery. Therefore, when the power battery is in a low-temperature environment, the path switching module enters the first state to connect the charging interface to the battery heating load. This allows the battery topology circuit to heat the power battery while preventing the charging device connected to the charging interface from supplying power to the battery, thereby effectively preventing lithium plating at low temperatures and improving battery safety.

[0088] Please refer to Figure 17 This document illustrates a flowchart of a circuit control method provided in an embodiment of this application. The circuit control method is applied to any battery topology circuit provided in the embodiments of this application, or to any vehicle provided in the embodiments of this application. Optionally, the circuit control method can be executed by a control module in the battery topology circuit or the vehicle. Figure 16As shown, the circuit control method includes: Step 1601: Detect the ambient temperature of the power battery.

[0089] Step 1602: When the ambient temperature is below the low temperature threshold, the control path switching module switches to the first state.

[0090] Step 1603: When the ambient temperature is not lower than the low temperature threshold, the control path switching module switches to the second state.

[0091] In this embodiment, when the power battery is in a low-temperature environment, the path switching module can switch to the first state to connect the charging interface and the battery heating load. The battery topology circuit can heat the power battery while preventing the charging device 4 connected to the charging interface from supplying power to the power battery, thereby effectively preventing lithium deposition at low temperatures and improving battery safety.

[0092] In some embodiments, the battery topology circuit 1 further includes a first switch K1. The circuit control method further includes: controlling the first switch to close when the ambient temperature is below a low temperature threshold; and controlling the first switch to close when the ambient temperature is not below the low temperature threshold.

[0093] In some embodiments, the battery topology circuit 1 further includes a second switch K2. The circuit control method further includes: controlling the second switch to open when the ambient temperature is below a low temperature threshold; and controlling the second switch to open when the ambient temperature is not below the low temperature threshold.

[0094] In some embodiments, the path switching module 11 is connected to the first terminal of the power battery 2, the target node O, the second terminal of the first switch K1, and the battery heating load 31, respectively. The process of controlling the path switching module to switch to the first state further includes: controlling the path switching module to connect the charging interface and the target node. Correspondingly, optionally, the process of controlling the path switching module to switch to the second state further includes: controlling the path switching module to connect the charging interface and the first terminal of the power battery, and the target node and the battery heating load.

[0095] In some embodiments, the path switching module 11 includes a first connector 111, a second connector 112, a third connector 113, and a rotating member. The process of controlling the path switching module to switch to the first state further includes controlling the rotating member to switch to a first rotation position to connect the charging interface and the target node via the first connector. Correspondingly, optionally, the process of controlling the path switching module to switch to the second state further includes controlling the rotating member to switch to a second rotation position to connect the charging interface and the first terminal of the power battery via the second connector, and the third connector to connect the target node and the battery heating load.

[0096] In some embodiments, the path switching module 11 includes a third switch K3 and a fourth switch K4. The process of controlling the path switching module to switch to the first state further includes: controlling the third switch K3 to close and the fourth switch K4 to open, so as to connect the charging interface and the target node. Correspondingly, optionally, the process of controlling the path switching module to switch to the second state further includes: controlling the third switch K3 to open and the fourth switch K4 to close, so as to connect the charging interface and the first terminal of the power battery, and the third connector to connect the target node and the battery heating load.

[0097] In some embodiments, the battery topology circuit 1 further includes a fifth switch K5. The circuit control method further includes controlling the fifth switch to close.

[0098] In some embodiments, the battery topology circuit 1 further includes a sixth switch K6. The circuit control method further includes: controlling the sixth switch to close when the ambient temperature is below a low temperature threshold; and controlling the sixth switch to open when the ambient temperature is not below the low temperature threshold.

[0099] In some embodiments, the battery topology circuit 1 further includes a seventh switch K7. The circuit control method further includes controlling the seventh switch to close.

[0100] For example, in battery topology circuit 1, Figure 13 In the case of the battery topology circuit 1 shown, the circuit control method includes: when the charging interface is connected to a charging pile, detecting the ambient temperature of the power battery; when the ambient temperature is below a low temperature threshold, controlling the first switch to close, the second switch to open, the fifth switch to close, and the sixth switch to close; and controlling the rotating component to switch to a first rotation position, so as to connect the second end of the first switch to the battery heating load through the first connector, so that the charging device forms a circuit loop with the battery heating load through the charging interface using the first connector, and the charging device supplies power to the battery heating load separately, so that the battery heating load heats the power battery. When the ambient temperature is not lower than the low temperature threshold, controlling the first switch to close, the second switch to open, the fifth switch to close, and the sixth switch to open; and controlling the rotating component to switch to a second rotation position, so as to connect the second end of the first switch to the first terminal of the power battery, so that the charging device forms a circuit loop with the power battery through the charging interface using the second connector, and the charging device charges the power battery to achieve fast charging of the power battery.

[0101] It should be noted that the explanation and implementation of each step in the method embodiment of this application can refer to the relevant information in the foregoing embodiments, and will not be repeated here.

[0102] In this embodiment, the battery topology circuit can switch the path switching module to the first state when the power battery is in a low-temperature environment. The battery topology circuit can heat the power battery while preventing the charging device connected to the charging interface from supplying power to the power battery, thereby effectively preventing lithium deposition at low temperatures and improving battery safety.

[0103] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A battery topology circuit, characterized in that, The battery topology circuit (1) includes: a path switching module (11) and a charging interface (12), wherein the charging interface (12) is used to connect to a charging device; The path switching module (11) is connected to the charging interface (12), the battery heating load (31), and the power battery (2) respectively, and is used at least to switch between the first state and the second state. The first state is configured to connect the battery heating load (31) and the charging interface (12) so that the charging device supplies power to the battery heating load (31), and the second state is configured to connect the power battery (2) and the charging interface (12) so that the charging device charges the power battery (2).

2. The battery topology circuit according to claim 1, characterized in that, The battery topology circuit (1) also includes: a second switching element (K2); The first end of the second switch (K2) is connected to the first pole of the power battery (2), and the second end of the second switch (K2) is connected to the battery heating load (31); the path switching module (11) is connected to the charging interface (12), the first pole of the power battery (2), and the target node, respectively. The first state is configured to connect the target node and the charging interface (12), and the second switch (K2) is disconnected when the path switching module (11) is in the first state. The target node is the electrical connection point between the second end of the second switch (K2) and the battery heating load (31).

3. The battery topology circuit according to claim 2, characterized in that, The path switching module (11) includes: a first connector (111), a second connector (112), a third connector (113), and a rotating component; The rotating component is connected to the first connecting component (111), the second connecting component (112), and the third connecting component (113) respectively; the first state is configured to switch the rotating component to a first rotating position, and the second state is configured to switch the rotating component to a second rotating position; When the rotating member is in the first rotating position, the first connecting member (111) connects the charging interface (12) and the target node; when the rotating member is in the second rotating position, the second connecting member (112) connects the charging interface (12) and the first pole of the power battery (2), and the third connecting member (113) connects the target node and the battery heating load (31).

4. The battery topology circuit according to claim 2, characterized in that, The path switching module (11) includes: a third switch (K3) and a fourth switch (K4); The third switch (K3) is connected to the charging interface (12) and the target node, respectively, and the fourth switch (K4) is connected to the charging interface (12) and the first pole of the power battery (2), respectively. The first state is configured such that the third switch (K3) is closed and the fourth switch (K4) is open, and the second state is configured such that the third switch (K3) is open and the fourth switch (K4) is closed.

5. The battery topology circuit according to any one of claims 1 to 4, characterized in that, The battery topology circuit also includes: a fifth switching element (K5); The first end of the fifth switch (K5) is connected to the second pole of the power battery (2), the second end of the fifth switch (K5) is connected to the second pole interface of the charging interface (12), and the first pole of the power battery (2) is connected to the first pole interface of the charging interface (12) through the path switching module (11).

6. The battery topology circuit according to claim 5, characterized in that, The battery topology circuit also includes: a sixth switch (K6). The first end of the sixth switch (K6) is connected to the first end of the fifth switch (K5) and the second terminal of the power battery (2), and the second end of the sixth switch is connected to the battery heating load (31). When the path switching module (11) is in the first state, both the fifth switch (K5) and the sixth switch (K6) are closed; when the path switching module (11) is in the second state, the fifth switch (K5) is closed and the sixth switch (K6) is open.

7. The battery topology circuit according to claim 5, characterized in that, The battery topology circuit also includes: a seventh switch (K7). The first end of the seventh switch (K7) is connected to the second pole of the power battery (2), and the second end of the seventh switch (K7) is connected to the first end of the fifth switch (K5) and the battery heating load (31) respectively. The fifth switch (K5) and the seventh switch (K7) close synchronously.

8. The battery topology circuit according to any one of claims 1 to 4, characterized in that, The battery topology circuit also includes: a first switching element (K1); The path switching module (11) is connected to the first pole interface of the charging interface (12) through the first switch (K1), and the second pole interface of the charging interface (12) is connected to the power battery (2) and the battery heating load (31) respectively.

9. The battery topology circuit according to any one of claims 1 to 4, characterized in that, The battery topology circuit also includes: a control module; The control module is connected to the path switching module (11) and is used to detect the ambient temperature of the power battery (2). When the ambient temperature is lower than the low temperature threshold, the control module (11) is switched to the first state. When the ambient temperature is not lower than the low temperature threshold, the control module (11) is switched to the second state.

10. A vehicle, characterized in that, The vehicle includes: a power battery, and a battery topology circuit as described in any one of claims 1 to 9.

11. A circuit control method, characterized in that, Applied to the battery topology circuit of any one of claims 1 to 9, or to the vehicle of claim 10, the method comprises: Detect the ambient temperature of the power battery; When the ambient temperature is below the low temperature threshold, the path switching module is controlled to switch to the first state; When the ambient temperature is not lower than the low temperature threshold, the control module switches to the second state.

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