CN218549532U

CN218549532U - Power supply circuit, power supply system and vehicle

Info

Publication number: CN218549532U
Application number: CN202221845642.8U
Authority: CN
Inventors: 张志国
Original assignee: Zhuhai Cosmx Power Co Ltd
Current assignee: Zhuhai Cosmx Power Co Ltd
Priority date: 2022-07-18
Filing date: 2022-07-18
Publication date: 2023-02-28
Anticipated expiration: 2032-07-18

Abstract

The application provides a power supply circuit, a power supply system and a vehicle. The power supply circuit includes: the power supply system comprises a first battery pack, a second battery pack, a first power supply port, a second power supply port, a first switch circuit, a second switch circuit, a DC/DC converter and a control device, wherein the first battery pack and the second battery pack are connected in series or in parallel; the first power supply port is connected with the first switch circuit in series, the second power supply port is connected with the second switch circuit in series, and the first switch circuit and the second switch circuit are respectively connected with the first battery pack; a DC/DC converter is also connected in series between the first power supply port and the second battery pack, and the DC/DC converter is connected with the first switch circuit in parallel; the control device is respectively connected with the circuit where the first battery pack is located and the circuit where the second battery pack is located. The power supply circuit improves the reliability of power supply of low-voltage electrical equipment and avoids potential safety hazards.

Description

Power supply circuit, power supply system and vehicle

Technical Field

The application relates to the technical field of new energy vehicles, in particular to a power supply circuit, a power supply system and a vehicle.

Background

With the development of science and technology and the progress of society, new energy vehicles with smaller environmental impact than traditional vehicles are increasingly popular, and meanwhile, the requirements of people on new energy vehicles are higher and higher.

In new energy vehicles, a 12V storage battery for supplying power to all low-voltage electrical equipment of the whole vehicle is important. The 12V storage battery can supply power for starting of the internal combustion engine and can also supply power for a plurality of loads such as vehicle light, an electric door lock, an electric brake controller, an electric power steering controller, an automatic driving controller and the like. Therefore, in order to realize the power supply of the 12V secondary battery, the power supply circuit thereof may be distributed over the body of the vehicle. However, when a vehicle is involved in an accident such as a collision, the power supply circuit is provided in the vehicle body, which may cause a short circuit, and the 12V battery cannot supply power to the low-voltage electrical equipment. This can influence the normal work of some important loads, leads to under emergency driver's unable effective control vehicle state, perhaps can't open the door and rescue to lead to serious potential safety hazard.

Therefore, a power supply scheme capable of supplying power to low-voltage electrical equipment in case of power supply abnormality of the 12V battery system is required.

SUMMERY OF THE UTILITY MODEL

The application provides a power supply circuit, power supply system and vehicle for the low pressure electrical equipment power supply of solving current vehicle is unreliable, easily leads to the technical problem of potential safety hazard.

In a first aspect, the present application provides a power supply circuit comprising:

the power supply system comprises a first battery pack, a second battery pack, a first power supply port, a second power supply port, a first switching circuit, a second switching circuit, a DC/DC converter and a control device, wherein the first battery pack is connected with the second battery pack in series or in parallel;

the first power supply port is connected in series with the first switch circuit, the second power supply port is connected in series with the second switch circuit, and the first switch circuit and the second switch circuit are respectively connected with the first battery pack;

the DC/DC converter is also connected in series between the first power supply port and the second battery pack, the DC/DC converter is connected in parallel with the first switching circuit, and the DC/DC converter is used for converting the power supply voltage of the second battery pack or the power supply voltages of the first battery pack and the second battery pack into the power supply voltage corresponding to the first battery pack;

the control device is respectively connected with the circuit where the first battery pack is located and the circuit where the second battery pack is located, and the control device is used for: and when the power supply circuit is detected to have abnormal power supply, the first switch circuit is controlled to be switched off.

In one possible embodiment, the supply voltage of the second battery pack is an integer multiple of the supply voltage of the first battery pack;

alternatively, the first and second electrodes may be,

the second battery pack comprises a plurality of first battery packs, and the power supply voltage of the second battery pack is integral multiple of the power supply voltage of the first battery packs;

alternatively, the first and second liquid crystal display panels may be,

the second battery pack includes a plurality of third battery packs, a supply voltage of the third battery packs is greater than a supply voltage of the first battery pack, and the supply voltage of the third battery packs is an integral multiple of the supply voltage of the first battery pack.

In a possible embodiment, when the first battery pack is connected in series with the second battery pack, the power supply circuit further comprises a voltage control element connected in parallel with the first battery pack, the voltage control element being further connected to the control device.

In one possible embodiment, the method further comprises: the battery pack protection circuit comprises a first current detection device and a second current detection device, wherein the first current detection device is connected with the first battery pack in series, the second current detection device is connected with the second battery pack in series, the first current detection device is used for detecting the current value of the first battery pack, and the second current detection device is used for detecting the current value of the second battery pack.

In one possible implementation, the power supply circuit further includes: a third power supply port connected in series with the second battery pack through a third switch circuit.

In one possible embodiment, the control device comprises:

the acquisition module is used for monitoring the circuit information of the power supply circuit in real time;

and the execution module is used for determining whether the power supply circuit is abnormal in power supply according to the circuit information, and controlling the first switch circuit to be switched off when the power supply circuit is detected to be abnormal in power supply.

In a possible implementation, the circuit information includes current information or voltage information, and the execution module is specifically configured to:

when the first current value detected by the first current detection device is greater than or equal to a first current threshold value, controlling the first switch circuit to be switched off; alternatively, the first and second electrodes may be,

when the second current value detected by the second current detection device is greater than or equal to a second current threshold value, controlling the first switch circuit to be switched off; alternatively, the first and second electrodes may be,

when detecting that the first voltage value of the second power supply port is smaller than or equal to a first voltage threshold value, controlling the first switch circuit to be switched off; alternatively, the first and second electrodes may be,

when detecting that a second voltage value of a component chip of the first battery pack is smaller than or equal to a second voltage threshold, controlling the first switch circuit to be switched off; alternatively, the first and second electrodes may be,

and controlling the first switch circuit to be switched off when detecting that a third current value of a body diode of the voltage control element is larger than or equal to a third current threshold value.

In one possible implementation, the execution module is further configured to:

and after detecting that the third current value is greater than or equal to a third current threshold value, controlling a controllable switch in the voltage control element to be closed and conducted.

In one possible implementation, the execution module is further configured to:

after the first switch circuit is controlled to be switched off, judging whether the power supply circuit still has power supply abnormity;

if not, outputting first abnormal prompt information, wherein the first abnormal prompt information is used for indicating that the power supply abnormality is caused by the abnormality of the internal battery;

and if so, controlling the second switch circuit to be switched off, and outputting second abnormity prompt information, wherein the second abnormity prompt information is used for indicating that the power supply abnormity is caused by the abnormity of the external load.

In a second aspect, the present application provides a power supply system comprising the power supply circuit of any one of the above first aspects and a load; wherein the power supply circuit is used for supplying power to the load.

In a third aspect, the present application provides a vehicle comprising a power supply circuit according to any one of the above first aspects.

According to the power supply circuit, the first battery pack and the second battery pack are connected in series or in parallel to supply power to the load connected with the first power supply port and the second power supply port, even if power supply abnormality occurs to a certain battery pack, the other battery pack can still realize normal power supply to the load, and the reliability of load power supply is improved.

Furthermore, the first power supply port is connected in series with the first switch circuit, the second power supply port is connected in series with the second switch circuit, and the first switch circuit and the second switch circuit are respectively connected with the first battery pack. Through the arrangement, the first battery pack and the second battery pack can respectively provide two relatively independent power supply loops for low-voltage loads in the vehicle, even if a certain load breaks down to cause the power supply loop where the certain load is located to have power supply abnormality, the normal power supply of the other loop is not influenced, and the reliability of the power supply of the load is further improved.

Further, the low voltage load may be divided into a critical load and a non-critical load according to reliability requirements, the first power supply port being connected to the critical load and the second power supply port being connected to the non-critical load. When the vehicle is collided or has a fault to cause the abnormal power supply of the loop where the first battery pack is located, the control device can control the first switch circuit to be disconnected, so that the first battery pack does not continue to independently supply power for the important load connected with the first power supply port any more, the power supply interference of the loop with the abnormal power supply for the important load connected with the first power supply port is avoided, and the fault isolation is realized. In addition, after the first switch circuit is disconnected, even if the first battery pack cannot independently supply power, the second battery pack can still independently supply power or be connected with the first battery pack in series to normally supply power to the important load connected with the first power supply port, so that the reliability of power supply of the important load is further improved, and potential safety hazards possibly caused by abnormal power supply of the important load are avoided.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and, together with the description, serve to explain the principles of the application.

FIG. 1 is a schematic diagram of a prior art power supply circuit for a vehicle;

fig. 2 is a schematic diagram of a power supply circuit according to an embodiment of the present application;

FIG. 3 is a schematic diagram of a power supply circuit according to another embodiment of the present application;

fig. 4 is a schematic structural diagram of a control device of a power supply circuit according to an embodiment of the present disclosure.

Reference numerals: 1. a first battery pack; 2. a second battery pack; 3. a first power supply port; 4. a second power supply port; 5. a first switching circuit; 6. a second switching circuit; 7. a DC/DC converter; 8. a control device; 9. a voltage control element; 10. a first current detection device; 11. a second current detecting device; 12. a third power supply port; 13. a third switch circuit; 81. an acquisition module; 82. and executing the module.

With the above figures, there are shown specific embodiments of the present application, which will be described in more detail below. These drawings and written description are not intended to limit the scope of the inventive concepts in any manner, but rather to illustrate the inventive concepts to those skilled in the art by reference to specific embodiments.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus consistent with certain aspects of the present application, as detailed in the appended claims.

The terms referred to in this application are explained first:

the DC/DC converter, which is a switching power supply chip, can store input electric energy in a capacitor (inductor) by performing high-frequency switching operation through a controllable switch (MOSFET, etc.) using the energy storage characteristics of the capacitor and the inductor, and when the switch is turned off, the electric energy is released to a load to supply energy. The ability to output power or voltage is related to the duty cycle (ratio of switch on time to total switch period), and DC/DC converters can be used for both step-up and step-down.

The voltage control element refers to a metal oxide semiconductor field effect transistor (MOSFET, abbreviated as MOS transistor), and includes a body diode and a controllable switch capable of conducting in a single direction.

In new energy vehicles, a 12V battery for supplying power to all low-voltage electrical devices of the entire vehicle is important. The 12V storage battery can supply power for starting of the internal combustion engine, and can also supply power for a plurality of loads such as vehicle light, an electric door lock, an electric brake controller, an electric power steering controller and an automatic driving controller, and all low-voltage electrical equipment are connected with the 12V storage battery through a 12V power bus. Since the low-voltage electrical equipment is distributed at different positions of the vehicle, in order to realize the power supply of the 12V storage battery, a power supply circuit of the low-voltage electrical equipment can be distributed on the body of the vehicle, and some low-voltage electrical equipment is even arranged outside the body.

Fig. 1 is a schematic diagram of a power supply circuit of a vehicle in the prior art, as shown in fig. 1, a 12V battery is connected to a power supply port through a power bus, the power supply port is connected to a plurality of loads, so as to provide 12V power for the loads, and all low-voltage loads are connected to the 12V battery through a power bus.

However, when an accident such as a collision of the vehicle occurs, the collision may cause an electric circuit provided on the vehicle body to be opened or cause an electric circuit to be short-circuited, so that the 12V battery can no longer supply power to the low-voltage electric devices. This can influence some important loads, for example the normal work of equipment such as electric brake controller, electric power assisted steering controller, autopilot controller, leads to under the emergency driver can't effective control vehicle state, perhaps can't open the door and rescue to lead to serious potential safety hazard.

Therefore, the present application provides a new power supply circuit for solving the above technical problems of the existing power supply circuit. In the power supply circuit provided by the application, the first battery pack and the second battery pack are connected in series or in parallel to supply power for the load connected with the first power supply port or the second power supply port, even if a certain battery pack is abnormal in power supply, the other battery pack can still realize normal power supply for the load, and the reliability of load power supply is improved. Furthermore, the first power supply port is connected in series with the first switch circuit, the second power supply port is connected in series with the second switch circuit, and the first switch circuit and the second switch circuit are respectively connected with the first battery pack. Through the arrangement, the first battery pack and the second battery pack can respectively provide two relatively independent power supply loops for low-voltage loads in the vehicle, even if a certain load breaks down to cause the power supply loop where the certain load is located to have power supply abnormality, the normal power supply of the other loop is not influenced, and the reliability of the power supply of the load is further improved. Further, the low voltage load may be divided into a critical load and a non-critical load according to reliability requirements, the first power supply port being connected to the critical load and the second power supply port being connected to the non-critical load. When the vehicle is collided or has a fault to cause the abnormal power supply of the loop where the first battery pack is located, the control device can control the first switch circuit to be disconnected, so that the first battery pack does not continue to supply power for the important load connected with the first power supply port any more, the power supply interference of the loop with the abnormal power supply for the important load connected with the first power supply port is avoided, and the fault isolation is realized. In addition, after the first switch circuit is disconnected, even if the first battery pack cannot supply power, the second battery pack can still normally supply power to the important load connected with the first power supply port, so that the power supply reliability of the important load is further improved, and potential safety hazards possibly caused by abnormal power supply of the important load are avoided.

The following describes the technical solutions of the present application and how to solve the above technical problems with specific embodiments. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments. Embodiments of the present application will be described below with reference to the accompanying drawings.

Example one

Fig. 2 is a schematic diagram of a power supply circuit according to an embodiment of the present disclosure, and as shown in fig. 2, the power supply circuit may include:

the device comprises a first battery pack 1, a second battery pack 2, a first power supply port 3, a second power supply port 4, a first switch circuit 5, a second switch circuit 6, a DC/DC converter 7 and a control device 8, wherein the first battery pack 1 is connected with the second battery pack 2 in series.

The first power supply port 3 is connected with the first switch circuit 5 in series, the second power supply port 4 is connected with the second switch circuit 6 in series, and the first switch circuit 5 and the second switch circuit 6 are respectively connected with the first battery pack 1; a DC/DC converter 7 is also connected in series between the first power supply port 3 and the second battery pack 2, the DC/DC converter 7 is connected with the first switch circuit 5 in parallel, and the DC/DC converter 7 is used for converting the power supply voltages of the first battery pack 1 and the second battery pack 2 into the power supply voltage corresponding to the first battery pack 1;

control device 8 is connected to the circuit of first battery 1 and the circuit of second battery 2, and control device 8 may be configured to: when the power supply circuit is detected to have power supply abnormality, the first switch circuit 5 is controlled to be switched off.

In this embodiment, please refer to the third embodiment for the detailed structure of the control device 8.

In the present embodiment, when the control device 8 does not detect the power supply abnormality of the power supply circuit, both the first switch circuit 5 and the second switch circuit 6 are in the closed conduction state.

In the present embodiment, the DC/DC converter 7 may be a 48v &12v DC/DC converter capable of converting a 48V voltage into a 12V voltage.

In the present embodiment, the first battery pack 1 may be a 12V battery pack, and as shown in fig. 2, the first battery pack 1 may provide 12V voltage for the load connected to the first power supply port 3 and the second power supply port 4 through the first switch circuit 5 and the second switch circuit 6, respectively.

The second battery pack 2 may be a 36V battery pack, and as shown in fig. 2, the second battery pack 2 may be connected in series with the first battery pack 1 to form a 48V battery pack, so as to provide a 48V voltage, and after the 48V voltage provided by the second battery pack is converted into a 12V voltage by the DC/DC converter 7, the 48V voltage may supply power to a load connected to the first power supply port 3, or supply power to a load connected to the second power supply port 4 through the first switching circuit 5 and the second switching circuit 6.

In the present embodiment, the loads connected to the first power supply port 3 may be important loads with high reliability requirements, such as electric door locks, power steering controllers, and other loads, which play an important role in emergency operation when a vehicle collides, and must be able to operate normally, that is, the power supply circuit must ensure power supply to these loads. Therefore, the loads connected with the first power supply port 3 can be reduced and refined, and related circuits are not arranged on or outside the vehicle body as much as possible, so that the reliability of power supply is improved, and the power supply of important loads is prevented from being influenced when the vehicle collides.

In this embodiment, the load connected to the second power supply port 4 may be other than important loads, such as vehicle lights, audio equipment, a camera, a cigarette lighter, etc., which are not important in emergency operation when a vehicle collision occurs, and do not substantially work, so that the power supply reliability is not required.

In the present embodiment, when the control device detects that the power supply circuit has power supply abnormality, the control device controls the first switch circuit 5 to be turned off, so that the first battery pack 1 can not independently supply power to the load connected to the first power supply port 3, but is connected in series with the second battery pack 2 to supply power to the load connected to the first power supply port 3. The circuit formed by connecting the first battery pack 1 and the second battery pack 2 in series is generally arranged in a carriage, is not easily damaged even if a vehicle collides, and can normally supply power.

It should be noted that the operating voltage range of the 48v &12v DC/DC converter is generally 24V to 52V, and even if the first battery pack 1 cannot normally supply power, resulting in a low loop voltage, the 48v &12v DC/DC converter can still normally operate as long as the total voltage of the first battery pack 1 and the second battery pack 2 connected in series is within the range of 24V to 52V, thereby ensuring that the load connected to the first power supply port 3 can obtain a stable 12V voltage. Meanwhile, an external 48V power supply can also provide power for the 48v &12v DC/DC converter, and simultaneously charge the first battery pack 1 and the second battery pack 2, further ensuring the load voltage to be stable.

In a possible embodiment, the second battery pack 2 may include a plurality of first battery packs 1, and the supply voltage of the second battery pack 2 is an integral multiple of the supply voltage of the first battery packs 1.

In the present embodiment, when the second battery pack 2 is a 36V battery pack, the second battery pack 2 may be composed of three first battery packs 1 connected in series. Since the 12V battery pack is a basic power source in the low-voltage power supply system, the 36V second battery pack 2 can be simply and conveniently obtained by connecting a plurality of 12V battery packs in series.

In one possible embodiment, as shown in fig. 2, when the first battery pack 1 is connected in series with the second battery pack 2, the power supply circuit may further include: and a voltage control element 9, wherein the voltage control element 9 is connected with the first battery pack 1 in parallel, and the voltage control element 9 is also connected with the control device 8.

In this embodiment, the voltage control element 9 comprises a body diode and a controllable switch, and when the first battery pack 1 is able to discharge, the controllable switch in the voltage control element 9 is off and the circuit in which the voltage control element 9 is located cannot conduct. When the first battery 1 cannot discharge, the control device 8 controls the controllable switch in the voltage control element 9 to close, so that the circuit in which the voltage control element 9 is located is conductive.

In this embodiment, there are many reasons for power supply abnormality of the power supply circuit, which may be that an open circuit occurs inside the first battery pack 1 or a failure that the first battery pack cannot discharge occurs, and in order to avoid the open circuit occurring in the circuit where the first battery pack 1 is located and the second battery pack 2 cannot discharge, a voltage control element 9 connected in parallel with the first battery pack 1 may be provided, so that the second battery pack 2 can normally supply power to the load connected to the first power supply port 3.

In one possible implementation, as shown in fig. 2, the power supply circuit may further include: the battery pack comprises a first current detection device 10 and a second current detection device 11, wherein the first current detection device 10 is connected with the first battery pack 1 in series, the second current detection device 11 is connected with the second battery pack 2 in series, the first current detection device 10 is used for detecting the current value of the first battery pack 1, and the second current detection device 11 is used for detecting the current value of the second battery pack 2.

In the present embodiment, the first current detection device 10 and the second current detection device 11 may be shunts.

In the present embodiment, the first current detection means 10 connected in series with the first battery pack 1 is capable of detecting the current flowing through the first battery pack 1, and the second current detection means 11 connected in series with the second battery pack 2 is capable of detecting the current flowing through the second battery pack 2, so that the control means 8 determines whether or not the power supply abnormality occurs in the power supply circuit based on the detected current value.

In one possible implementation, as shown in fig. 2, the power supply circuit may further include: and a third power supply port 12, wherein the third power supply port 12 is connected in series with the second battery pack 2 through a third switching circuit 13, so that the second battery pack 2 can be connected in series with the first battery pack 1 to supply power to a load connected with the third power supply port 12. Preferably, the second battery pack 2 is connected in series with the first battery pack 1 to provide 48V for the load connected to the third power supply port 12.

In the present embodiment, the load connected to the third power supply port 12 is a 48V high-voltage load, for example, an in-vehicle air conditioner, an electric turbocharger, or the like. Since these devices are typically located inside the vehicle cabin, the circuitry associated with the 48V power supply is also located inside the vehicle cabin and is not susceptible to damage.

In this embodiment, the first battery pack may independently supply power to a load connected to the first power supply port and the second power supply port, and the first battery pack may also be connected in series with the second battery pack and supply power to the load connected to the first power supply port and the second power supply port after voltage conversion by the DC/DC converter.

Further, the low voltage load may be divided into a critical load and a non-critical load according to reliability requirements, the first power supply port being connected to the critical load and the second power supply port being connected to the non-critical load. When the vehicle is collided or has a fault to cause that the power supply of the loop where the first battery pack is positioned is abnormal, the first battery pack can not independently supply power for each load or supply power abnormally, the control device can control the first switch circuit to be disconnected, so that the circuit that the first battery pack independently supplies power for the first power supply port is disconnected, the power supply interference of the loop which supplies power abnormally to the important load connected with the first power supply port is avoided, and the fault isolation is realized. In addition, after the first switch circuit is disconnected, the circuit formed by connecting the first battery pack and the second battery pack in series can still normally supply power to the important load connected with the first power supply port, so that the power supply reliability of the important load is further improved, and potential safety hazards possibly caused by abnormal power supply of the important load are avoided.

Example two

Fig. 3 is a schematic diagram of a power supply circuit according to another embodiment of the present application, and as shown in fig. 3, the power supply circuit may include:

the device comprises a first battery pack 1, a second battery pack 2, a first power supply port 3, a second power supply port 4, a first switch circuit 5, a second switch circuit 6, a DC/DC converter 7 and a control device 8, wherein the first battery pack 1 is connected with the second battery pack 2 in parallel.

The first power supply port 3 is connected with the first switch circuit 5 in series, the second power supply port 4 is connected with the second switch circuit 6 in series, and the first switch circuit 5 and the second switch circuit 6 are respectively connected with the first battery pack 1; a DC/DC converter 7 is also connected in series between the first power supply port 3 and the second battery pack 2, the DC/DC converter 7 is connected with the first switch circuit 5 in parallel, and the DC/DC converter 7 is used for converting the power supply voltage of the second battery pack 2 into the power supply voltage corresponding to the first battery pack 1;

In this embodiment, please refer to embodiment three for the detailed structure of the control device 8.

In the present embodiment, the first battery pack 1 may be a 12V battery pack, and as shown in fig. 3, the first battery pack 1 may provide 12V voltage for the load connected to the first power supply port 3 and the second power supply port 4 through the first switch circuit 5 and the second switch circuit 6, respectively.

The second battery pack 2 may be a 48V battery pack, and as shown in fig. 3, after the 48V voltage provided by the second battery pack 2 is converted into 12V voltage by the DC/DC converter 7, the load connected to the first power supply port 3 may be powered, or the load connected to the second power supply port 4 may be powered through the first switch circuit 5 and the second switch circuit 6.

In the present embodiment, the loads connected to the first power supply port 3 may be important loads with high reliability requirements, such as electric door locks, power steering controllers, and other loads, which play an important role in emergency operation when a vehicle collides, and must be able to operate normally, that is, the power supply circuit must ensure power supply to these loads. Therefore, the loads connected with the first power supply port 3 can be reduced and refined, and related circuits are not arranged on the vehicle body or outside the vehicle body as much as possible, so that the reliability of power supply is improved, and the power supply of important loads is prevented from being influenced when the vehicle collides.

In this embodiment, when the control device detects that the power supply circuit has power supply abnormality, the control device controls the first switch circuit 5 to be turned off, so that the first battery pack 1 can no longer supply power to the load connected to the first power supply port 3, and the second battery pack 2 can continue to supply power to the load connected to the first power supply port 3. Since the circuit in which the second battery pack 2 supplying the 48V power is located is generally disposed inside the vehicle compartment and is not easily damaged even in a vehicle collision, the second battery pack 2 can normally supply power to the load connected to the first power supply port 3 after the first switching circuit 5 is turned off.

It should be noted that the operating voltage range of the 48v &12v DC/DC converter is generally 24V to 52V, and as long as the voltage of the second battery pack 2 is within the range of 24V to 52V, the 48v &12v DC/DC converter can still normally operate, so as to ensure that the load connected to the first power supply port 3 can obtain a stable 12V voltage. Meanwhile, an external 48V power supply can also provide power for the 48V and 12V DC/DC converter, so that the load voltage is further ensured to be stable.

In one possible embodiment, the supply voltage of the second battery 2 is an integer multiple of the supply voltage of the first battery 1.

In the present embodiment, the second battery pack 2 may be a battery capable of providing 48V, so as to reduce the number of batteries in the battery pack and avoid a connection structure between the batteries, thereby improving the stability of power supply of the second battery pack 2.

Alternatively, the second battery pack 2 includes a plurality of first battery packs 1, and the supply voltage of the second battery pack 2 is an integral multiple of the supply voltage of the first battery packs 1.

In the present embodiment, when the second assembled battery 2 is a 48V assembled battery, the second assembled battery 2 may be composed of four first assembled batteries 1 connected in series. Since the 12V battery pack is a basic power source in the low voltage power supply system, the 48V second battery pack 2 can be easily and conveniently obtained by connecting a plurality of 12V battery packs in series.

Alternatively, the second battery pack 2 comprises a plurality of third battery packs, the supply voltage of which is greater than the supply voltage of the first battery pack 1, the supply voltage of which is an integer multiple of the supply voltage of the first battery pack 1.

In the present embodiment, the third battery pack may be a 24V battery, and when the second battery pack 2 is a 48V battery pack, the second battery pack 2 may also be formed by connecting two 24V battery packs in series, so as to reduce the number of batteries in the battery pack and simplify the connection structure between the batteries, thereby improving the stability of power supply of the second battery pack.

In the present embodiment, the specific structure of the second battery pack 2 is not limited herein, and those skilled in the art can flexibly set the structure as long as the second battery pack 2 can provide a voltage of 48V.

In one possible embodiment, as shown in fig. 3, the power supply circuit may further include: the battery pack comprises a first current detection device 10 and a second current detection device 11, wherein the first current detection device 10 is connected with the first battery pack 1 in series, the second current detection device 11 is connected with the second battery pack 2 in series, the first current detection device 10 is used for detecting the current value of the first battery pack 1, and the second current detection device 11 is used for detecting the current value of the second battery pack 2.

In the present embodiment, the first current detection device 10 and the second current detection device 11 may be current dividers.

In one possible embodiment, as shown in fig. 3, the power supply circuit may further include: a third power supply port 12, wherein the third power supply port 12 is connected in series with the second battery pack 2 through a third switch circuit 13, so that the second battery pack 2 can supply power to the load connected with the third power supply port 12. Preferably, the second battery pack 2 may provide 48V to a load connected to the third power supply port 12.

In the present embodiment, the load connected to the third power supply port 12 is a 48V high-voltage load, for example, an in-vehicle air conditioner, an electric turbocharger, or the like. Since these devices are generally disposed inside the vehicle cabin, the circuitry associated with the 48V power supply is also disposed inside the vehicle cabin and is not susceptible to damage.

In this embodiment, the first battery pack may supply power to a load connected to the first power supply port and the second power supply port, and the second battery pack connected in parallel to the first battery pack may also supply power to a load connected to the first power supply port and the second power supply port after voltage conversion by the DC/DC converter, so that even if a certain battery pack has power supply abnormality, another battery pack may still supply power to the load normally, thereby improving reliability of power supply to the load.

Further, the low voltage load may be divided into a critical load and a non-critical load according to reliability requirements, the first power supply port being connected to the critical load and the second power supply port being connected to the non-critical load. When the vehicle is collided or has a fault to cause that the power supply of the loop where the first battery pack is positioned is abnormal, the first battery pack can not supply power for each load or supply power abnormally, the control device can control the first switch circuit to be disconnected, so that the circuit for supplying power to the first power supply port by the first battery pack is disconnected, the power supply interference of the important load connected with the first power supply port by the loop with abnormal power supply is avoided, and the fault isolation is realized. In addition, after the first switch circuit is disconnected, even if the first battery pack cannot supply power, the second battery pack can still normally supply power to the important load connected with the first power supply port, so that the power supply reliability of the important load is further improved, and potential safety hazards possibly caused by abnormal power supply of the important load are avoided.

The structure of the control device in the first and second embodiments will be explained in detail using the third embodiment.

EXAMPLE III

Fig. 4 is a schematic structural diagram of a control device of a power supply circuit according to an embodiment of the present application, and as shown in fig. 4, the control device of the power supply circuit may include: an acquisition module 81 and an execution module 82.

The acquisition module 81 may be configured to monitor circuit information of the power supply circuit in real time.

The execution module 82 may be configured to determine whether a power supply abnormality occurs in the power supply circuit according to the circuit information; when the power supply circuit is detected to have power supply abnormality, the first switch circuit 5 is controlled to be switched off.

In this embodiment, the circuit information may be current information or voltage information, and of course, may also include other circuit information, which is not limited herein.

In this embodiment, the control device 8 may be a Battery Management System (BMS) in a vehicle, the collecting module 81 may be a battery sampling chip (AFE), and the executing module 82 may be a Micro Controller Unit (MCU). The control device 8 may detect the first battery pack 1, the second battery pack 2, and the voltage information of the battery cells of the battery packs through the battery sampling chip AFE, may also detect the charge/discharge current information of the first battery pack 1 through the first current detection device 10 in the power supply circuit, and detect the charge/discharge current information of the second battery pack 2 through the second current detection device 11.

In the present embodiment, since the circuit of the 48V power source in which the second battery pack 2 is located is generally disposed inside the vehicle cabin and is not easily damaged even in a vehicle collision, the second battery pack 2 can supply power to the load connected to the first power supply port independently or in series with the first battery pack after the first switching circuit 5 is turned off.

In one possible implementation, the execution module 82 may be configured to: when the first current value detected by the first current detecting device 10 is greater than or equal to the first current threshold value, the first switch circuit 5 is controlled to be turned off.

In this embodiment, the first battery pack 1 is a 12V battery pack, which is independent or connected in series with the second battery pack 2 to supply power to the load connected to the first power supply port 3 and the second power supply port 4, and when the load connected to the second power supply port 4 is overloaded or short-circuited, the current of the first battery pack 1 connected to the load is too large, which results in abnormal power supply of the first battery pack 1. Therefore, it is possible to simply and accurately determine whether or not the power supply circuit has a power supply abnormality by detecting the first current value of the first battery pack 1.

Alternatively, the execution module 82 may also be configured to: when the second current value detected by the second current detecting means 11 is greater than or equal to the second current threshold value, the first switch circuit 5 is controlled to be turned off.

In this embodiment, the second battery pack 2 and the first battery pack 1 are connected in series or in parallel to supply power to the load connected to the first power supply port 3 and the second power supply port 4, and when the load connected to the second power supply port 4 is overloaded or short-circuited, the current of the first battery pack 1 connected to the load is too large, so that the current of the second battery pack 2 is increased, and the power supply of the first battery pack 1 is abnormal. Therefore, it is possible to simply and accurately determine whether or not the power supply circuit has a power supply abnormality by detecting the second current value of the second battery pack 2.

In the present embodiment, the first current threshold may be a maximum current value flowing through the first battery pack 1 during normal power supply, and the second current threshold may be a maximum current value flowing through the second battery pack 2 during normal power supply. The specific values of the first current threshold and the second current threshold can be flexibly set by those skilled in the art, and are not limited herein. The first current threshold and the second current threshold may be the same or different, and when the second battery pack 2 is connected in series with the first battery pack 1, since the currents flowing through the second battery pack 2 and the first battery pack 1 are the same, the first current threshold and the second current threshold are the same; when the second battery pack 2 is connected in parallel with the first battery pack 1, since the currents flowing through the second battery pack 2 and the first battery pack 1 may be different, the first current threshold value and the second current threshold value may also be different.

Alternatively, the execution module 82 may also be configured to: when detecting that the first voltage value of the second power supply port 4 is less than or equal to the first voltage threshold, controlling the first switch circuit 5 to be switched off.

In this embodiment, the first voltage threshold may be a minimum voltage value that can ensure normal power supply of the load of the second power supply port 4, and a specific value of the first voltage threshold may be flexibly set by a person skilled in the art, and is not limited herein, and generally, the first voltage threshold may be 12V.

In the present embodiment, when the load connected to the second power supply port 4 is overloaded or short-circuited, the voltage value of the second power supply port 4 is also pulled down, so that the voltage value of the first battery pack 1 is pulled down, which causes abnormal power supply to the first battery pack 1. Therefore, whether the power supply circuit has power supply abnormality can be simply and accurately determined by detecting the first voltage value of the second power supply port 4.

Alternatively, the execution module 82 may also be configured to: when detecting that the second voltage value of the constituent chip of the first battery pack 1 is less than or equal to the second voltage threshold, the first switch circuit 5 is controlled to be turned off.

In this embodiment, the second voltage threshold may be a minimum voltage value when the constituent cells of the first battery pack 1 are normally discharged, and a specific value of the second voltage threshold may be flexibly set by a person skilled in the art, without any limitation herein, and generally, the second voltage threshold may be 3V.

In this embodiment, if a short circuit or a low voltage fault occurs in a battery cell in the first battery pack 1, the voltage value of the battery cell may be reduced, or the battery cell may not discharge, so that the voltage value of the first battery pack 1 is reduced, and the power supply of the first battery pack 1 is abnormal. For example, a 12V battery pack generally includes 4 battery cells connected in series, each battery cell is 3V, and if a certain battery cell cannot discharge, the 12V battery pack can only discharge 9V, and cannot normally supply power to a load. Therefore, it is possible to simply and accurately determine whether or not a power supply abnormality occurs in the power supply circuit by detecting the second voltage values of the constituent cells of the first battery pack 1.

Alternatively, the execution module 82 may also be configured to: when detecting that the third current value of the body diode of the voltage control element 9 is greater than or equal to the third current threshold value, the first switch circuit 5 is controlled to be turned off.

In the present embodiment, the third current threshold may be a maximum current value flowing through the body diode of the voltage control element 9 when the first battery pack 1 is normally discharged, and a specific value of the third current threshold may be flexibly set by a person skilled in the art, which is not limited herein.

In the present embodiment, if the first battery pack 1 is normally discharged, the current value flowing through the body diode is small at this time; if the first battery pack 1 is open or unable to discharge, the circuit thereof cannot be conducted, which may result in an increase in the current value of the body diode connected in parallel therewith. Therefore, whether or not the power supply circuit has a power supply abnormality can be determined simply and accurately by detecting the third current value of the body diode.

The above several embodiments exemplarily illustrate a specific implementation process for determining whether the power supply circuit has the power supply abnormality according to the current information or the voltage information, and do not represent all technical solutions, and all technical solutions for determining whether the power supply circuit has the power supply abnormality according to the current information or the voltage information of the power supply circuit may fall within the protection scope of the present application.

In one possible embodiment, the execution module 82 may be further configured to: after detecting that the third current value is greater than or equal to the third current threshold value, the controllable switch in the control voltage control element 9 is controlled to be closed and conductive.

In this embodiment, the execution module 82 can control the controllable switch in the voltage control element 9 to be turned on and off, so as to ensure that the circulation loop is turned on, and reduce heat generation of the device.

In the present embodiment, if it is detected that the third current value is greater than or equal to the third current threshold, it indicates that the first battery pack 1 has an open circuit or a failure that cannot discharge, and the circuit in which the first battery pack is located cannot be conducted. Therefore, in order to ensure the normal power supply of the second battery pack 2, the controllable switch in the voltage control element 9 can be controlled to be closed and conducted, and even if the circuit in which the first battery pack 1 is located cannot be conducted, the current can complete the whole circulation loop from the circuit in which the voltage control element 9 is located in parallel connection with the current.

In one possible implementation, the execution module 82 may be further configured to: after the first switch circuit 5 is controlled to be switched off, whether the power supply circuit still has power supply abnormity is judged; if not, outputting first abnormal prompt information, wherein the first abnormal prompt information is used for indicating that the power supply abnormality is caused by the abnormality of the internal battery; if yes, the second switch circuit 6 is controlled to be switched off, and second abnormity prompt information is output and used for indicating that the power supply abnormity is caused by the abnormity of the external load.

In the present embodiment, the power supply abnormality may be caused by an internal failure of the battery pack or an abnormality of an external load to which the second power supply port 4 is connected, and the first power supply port 3 has been isolated from the first battery pack 1 in which the power supply failure may occur after the first switching circuit 5 is controlled to be turned off. And then, the circuit information of the power supply circuit can be continuously monitored in real time so as to judge whether the power supply abnormality is caused by the external load abnormality or not. Specifically, if there is no power supply abnormality in the power supply circuit after the first switch circuit 5 is turned off, the power supply abnormality is caused by an abnormality in the internal battery, and the first abnormality prompt information can be output regardless of the load; if the power supply circuit still has power supply abnormality after the first switch circuit 5 is disconnected, the power supply abnormality is caused by the abnormality of the external load, and the second switch circuit 6 can be controlled to be disconnected to isolate the fault load connected with the second power supply port 4 and output second abnormality prompt information.

In this embodiment, the specific implementation of the execution module 82 for determining whether the power supply circuit still has the power supply abnormality is the same as the foregoing abnormality determination method, and is not described herein again.

In the embodiment, after the first switch circuit 5 is controlled to be switched off, whether the power supply circuit has power supply abnormality is judged, so that the reason of the power supply abnormality can be simply and accurately determined, and the prompt information is output to prompt a driver to take relevant measures in time, thereby avoiding potential safety hazards. Further, if the power supply abnormality is caused by an external load abnormality, the second switch circuit 6 may be controlled to be turned off to stop supplying power to the faulty load connected to the second power supply port 4, thereby avoiding the presence of the faulty load from affecting the power supply to the load connected to the first power supply port 3.

In this embodiment, when the vehicle is collided or has a fault, which causes the abnormal power supply of the loop where the first battery pack is located, the first battery pack can not supply power for each load any more or the power supply is abnormal. When the control device determines that the power supply circuit has power supply abnormality through the current information or the voltage information of the power supply circuit, the first switch circuit can be controlled to be switched off, so that the circuit for supplying power to the first power supply port by the first battery pack is switched off, power supply interference caused by an important load connected with the first power supply port by a loop of abnormal power supply is avoided, and fault isolation is realized. In addition, after the first switch circuit is switched off, even if the first battery pack cannot normally supply power, the second battery pack still can normally supply power to the important load connected with the first power supply port, so that the reliability of power supply of the important load is further improved, and potential safety hazards possibly caused by abnormal power supply of the important load are avoided.

The application of the power supply circuit of the present application is explained below with a specific embodiment.

Example four

In a specific embodiment, a driver drives a new energy vehicle to run on a highway, in the process, a battery control device of the vehicle monitors current information or voltage information of a power supply circuit in real time and controls the power supply circuit to be closed or opened according to the current information or the voltage information, and the specific application process of the power supply circuit is as follows:

the method comprises the steps that firstly, a control device obtains a first current value of a first battery pack in real time through a first current detection device, obtains a second current value of a second battery pack in real time through a second current detection device, obtains a first voltage value of a second power supply port in real time, obtains a second voltage value of a battery core formed by the first battery pack in real time, obtains a third current value of a body diode flowing through a voltage control element in real time, determines that a power supply circuit supplies power normally according to current information or voltage information, and keeps a first switch circuit closed and conducted so that the first battery pack and the second battery pack are connected in series or in parallel to supply power for a load connected with a first power supply port and a second power supply port.

And secondly, the vehicle suddenly collides with the front vehicle to cause a short circuit of a circuit arranged on the front vehicle body, and at the moment, the control device judges that the power supply circuit has abnormal power supply if the first current value of the first battery pack is detected to be overlarge by the first current detection device.

And thirdly, the control device controls the first switch circuit to be disconnected, the first battery pack is disconnected from a circuit for supplying power to the first power supply port, the second battery pack is connected with the first battery pack in series, or the second battery pack independently supplies power to a load connected with the first power supply port, so that the load connected with the first power supply port is ensured to supply power normally, the electric door lock of the new energy vehicle works normally, and a driver can open the electric door lock to ask for help.

An embodiment of the present application further provides a power supply system, which includes the power supply circuit and the load in any of the above embodiments; the power supply circuit is used for supplying power to the load.

An embodiment of the present application further provides a vehicle, which includes the power supply circuit in any one of the above embodiments.

Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.

It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.

Claims

1. A power supply circuit, comprising: the power supply system comprises a first battery pack, a second battery pack, a first power supply port, a second power supply port, a first switching circuit, a second switching circuit, a DC/DC converter and a control device, wherein the first battery pack is connected with the second battery pack in series or in parallel;

the control device is respectively connected with the circuit where the first battery pack is located and the circuit where the second battery pack is located, and is used for: and when the power supply circuit is detected to have abnormal power supply, the first switch circuit is controlled to be switched off.

2. The power supply circuit of claim 1, further comprising a voltage control element connected in parallel with the first battery pack when the first battery pack is connected in series with the second battery pack, the voltage control element further connected to the control device.

3. The power supply circuit of claim 2, further comprising: the battery pack comprises a first current detection device and a second current detection device, wherein the first current detection device is connected with the first battery pack in series, the second current detection device is connected with the second battery pack in series, the first current detection device is used for detecting the current value of the first battery pack, and the second current detection device is used for detecting the current value of the second battery pack.

4. The power supply circuit of claim 1, further comprising: a third power supply port connected in series with the second battery pack through a third switching circuit.

5. The power supply circuit according to claim 3, wherein the control means comprises:

6. The power supply circuit of claim 5, wherein the circuit information includes current information or voltage information, and the execution module is specifically configured to:

7. The power supply circuit of claim 6, wherein the execution module is further configured to:

8. The power supply circuit of claim 7, wherein the execution module is further configured to:

if not, outputting first abnormity prompt information, wherein the first abnormity prompt information is used for indicating that the power supply abnormity is caused by the abnormity of the internal battery;

9. A power supply system comprising a power supply circuit and a load as claimed in any one of claims 1 to 8;

wherein the power supply circuit is used for supplying power to the load.

10. A vehicle, characterized in that it comprises a supply circuit according to any one of the preceding claims 1-8.