CN117962684A

CN117962684A - Power supply circuit, power supply system and vehicle

Info

Publication number: CN117962684A
Application number: CN202410176016.1A
Authority: CN
Inventors: 李明远; 李华图
Original assignee: Xiaomi Automobile Technology Co Ltd
Current assignee: Xiaomi Automobile Technology Co Ltd
Priority date: 2024-02-07
Filing date: 2024-02-07
Publication date: 2024-05-03

Abstract

The disclosure relates to a power supply circuit, a power supply system and a vehicle, and relates to the technical field of power supply. Comprising the following steps: the battery comprises a first battery pack, a second battery pack, a first current converter, a second current converter and an isolating switch; the first end of the first current converter is connected with the positive electrode of the first battery pack, and the second end of the first current converter is connected with the negative electrode of the first battery pack; the first end of the second current converter is connected with the positive electrode of the second battery pack, and the second end of the second current converter is connected with the negative electrode of the second battery pack; the two ends of the isolating switch are respectively connected with the third end of the first current converter and the third end of the second current converter, and the isolating switch is closed to balance the electric quantity of the first battery pack and the second battery pack. By using the power supply circuit, the power supply system and the vehicle provided by the disclosure, the electric quantity balance between the first battery pack and the second battery pack can be realized on the basis of adding one isolating switch.

Description

Power supply circuit, power supply system and vehicle

Technical Field

The disclosure relates to the technical field of power supply, in particular to a power supply circuit, a power supply system and a vehicle.

Background

Currently, a vehicle is equipped with a first battery pack and a second battery pack, and when any one of the first battery pack and the second battery pack fails, power can be supplied through the other battery pack that has not failed.

However, the first battery pack and the second battery pack may cause imbalance of the remaining power in the first battery pack and the second battery pack due to factors such as imbalance of charging, imbalance of battery aging, use imbalance or temperature influence, which may further cause conditions such as reduction of the endurance mileage of the vehicle and unstable charging process.

Disclosure of Invention

In order to overcome the problems in the related art, the present disclosure provides a power supply circuit, a power supply system, and a vehicle.

According to a first aspect of embodiments of the present disclosure, there is provided a power supply circuit comprising: the battery comprises a first battery pack, a second battery pack, a first current converter, a second current converter and an isolating switch;

the first end of the first current converter is connected with the positive electrode of the first battery pack, the second end of the first current converter is connected with the negative electrode of the first battery pack, and the third end of the first current converter is used for outputting current to a low-voltage load;

The first end of the second current converter is connected with the positive electrode of the second battery pack, the second end of the second current converter is connected with the negative electrode of the second battery pack, and the third end of the second current converter is used for outputting current to a low-voltage load;

And two ends of the isolating switch are respectively connected with the third end of the first current converter and the third end of the second current converter, and the isolating switch is closed to balance the electric quantity of the first battery pack and the second battery pack.

Optionally, the third end of the first current converter is connected with a first low-voltage power grid and is connected with a second low-voltage power grid through the isolating switch; the third end of the second current converter is connected with a second low-voltage power grid and is connected with the first low-voltage power grid through the isolating switch;

the first low-voltage power network is used for supplying power to a first low-voltage load, and the second low-voltage power network is used for supplying power to a second low-voltage load.

Optionally, the system further comprises a controller;

The controller is configured to control the first current converter to output a first electric quantity to the first low-voltage power grid and the second low-voltage power grid, and control the second current converter to output a second electric quantity to the first low-voltage power grid and the second low-voltage power grid when the electric quantity of the first battery pack is greater than the electric quantity of the second battery pack;

the first electric quantity is larger than the second electric quantity, and the sum of the first electric quantity and the second electric quantity is the target electric quantity required by the low-voltage load.

Optionally, the system further comprises a controller;

The controller is configured to control the first current converter to output a third electric quantity to the first low-voltage power grid and the second low-voltage power grid when the electric quantity of the first battery pack is greater than the electric quantity of the second battery pack;

wherein the third power amount is a target power amount required for the low-voltage load.

Optionally, the system further comprises a controller;

The controller is used for controlling the electric quantity of the first battery pack to be transmitted to the second battery pack through the isolating switch under the condition that the electric quantity of the first battery pack is larger than the electric quantity of the second battery pack.

Optionally, a circuit breaking device is connected between the first battery pack and the second battery pack;

when the circuit breaking device is opened, the first battery pack supplies power to the low-voltage load through the first current converter, and the second battery pack supplies power to the low-voltage load through the second current converter.

Optionally, the system further comprises a controller;

The controller is used for opening the isolating switch under the condition that the first low-voltage power grid and/or the second low-voltage power grid are/is in fault.

Optionally, a low voltage battery is also included;

The positive electrode of the low-voltage battery is connected with a first low-voltage power grid and is connected with a second low-voltage power grid through the isolating switch; the negative electrode of the low-voltage battery is grounded.

Optionally, the first current converter and the second current converter are both bidirectional current converters.

According to a second aspect of embodiments of the present disclosure, there is provided a power supply system comprising the power supply circuit provided by the first aspect of embodiments of the present disclosure.

According to a third aspect of embodiments of the present disclosure, there is provided a vehicle on which the power supply system provided by the second aspect of embodiments of the present disclosure is disposed.

The technical scheme provided by the embodiment of the disclosure can comprise the following beneficial effects:

After the isolating switch is closed, the first current converter can drain more electric quantity in the first battery pack to the second battery pack through the isolating switch, the first current converter can drain the redundant electric quantity in the first battery pack to the low-voltage power grid through the isolating switch, and then drain the redundant electric quantity to the low-voltage load through the low-voltage power grid, the isolating switch is used as an electric quantity transmission bridge between the first battery pack and the second battery pack, and an electric quantity drainage bridge between the first battery pack and the low-voltage load, so that the redundant electric quantity in the first battery pack can be drained through the bridge, and the electric quantity in the first battery pack can gradually approach to the electric quantity in the second battery pack, so that the electric quantity of the first battery pack and the second battery pack tends to be balanced. After the electric quantity of the first battery pack and the electric quantity of the second battery pack tend to be balanced, the conditions of reduction of the endurance mileage of the vehicle, unstable charging process and the like can be reduced.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

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

Fig. 1 is a schematic diagram of a power supply circuit, according to an example embodiment.

Fig. 2 is a schematic diagram showing a first battery pack and a second battery pack being simultaneously powered according to an exemplary embodiment.

Fig. 3 is a schematic diagram illustrating a first battery pack bleeding power to a second battery pack according to an exemplary embodiment.

FIG. 4 is a schematic diagram illustrating a high voltage redundant input according to an exemplary embodiment.

Fig. 5 is a schematic diagram illustrating a first low voltage power network alone, according to an exemplary embodiment.

Fig. 6 is a schematic diagram illustrating a second low voltage power network separately powered according to an exemplary embodiment.

Fig. 7 is a schematic diagram illustrating a battery powered schematic according to an exemplary embodiment.

Fig. 8 is a flowchart illustrating steps of a power supply circuit control method according to an exemplary embodiment.

Fig. 9 is a block diagram of a power supply circuit control device according to an exemplary embodiment.

Fig. 10 is a block diagram of a vehicle, according to an exemplary embodiment.

Detailed Description

Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples are not representative of all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present disclosure as detailed in the accompanying claims.

It should be noted that, in the present disclosure, the terms "first", "second", and the like in the specification and claims and the drawings are used for distinguishing similar objects, and are not necessarily to be construed as describing a specific order or sequencing, for example, the first battery VCC1 and the second battery VCC2 in the present disclosure are used for distinguishing two battery packs, the first battery VCC1 in fig. 1 to 7 may be replaced with the second battery VCC2, and the second battery VCC2 may be replaced with the first battery VCC1; as another example, the first current converter DCDC1 and the second current converter DCDC2 in the present disclosure are used for distinguishing two current converters, the first current converter DCDC1 may be replaced by the second current converter DCDC2, and the second current converter DCDC2 may also be replaced by the first current converter DCDC1.

Fig. 1 is a schematic diagram of a power supply circuit according to an exemplary embodiment, the power supply circuit comprising: the battery pack comprises a first battery pack VCC1, a second battery pack VCC2, a first current converter DCDC1, a second current converter DCDC2 and a disconnecting switch S4.

The first battery set VCC1 and the second battery set VCC2 are high-voltage battery sets, and are power batteries on vehicles, and the first battery set VCC1 and the second battery set VCC2 are used for supplying power to high-voltage loads in a high-voltage power grid and also used for supplying power to low-voltage loads in a low-voltage power grid. The first battery pack VCC1 and the second battery pack VCC2 form a high-voltage redundancy circuit, and when any one of the first battery pack VCC1 and the second battery pack VCC2 fails, power can be continuously supplied through the other battery pack, thereby ensuring the operation of the vehicle. The positive electrode of the first battery pack VCC1 is connected with a high-voltage power grid through a total positive relay S2, and the negative electrode of the second battery pack VCC2 is connected with the high-voltage power grid through a total negative relay S3; the high voltage network is used to power at least one high voltage load.

A circuit breaking device S1 is connected between the first battery set VCC1 and the second battery set VCC2, and the circuit breaking device S1 may be any one of a fuse and a safety switch, and the safety switch refers to a pyrotechnic switch or an intelligent safety switch. The circuit breaking device S1 is used to open when the vehicle is dormant or when the high-voltage power network fails. When the circuit breaking device S1 is closed, the negative electrode of the first battery pack VCC1 is connected with the positive electrode of the second battery pack VCC2, and the first battery pack VCC1 and the second battery pack VCC2 form an integral high-voltage battery pack; when the breaking device S1 is turned off, the negative electrode of the first battery VCC1 and the negative electrode of the second battery VCC2 are grounded, and the first battery VCC1 and the second battery VCC2 are two independent high-voltage battery packs.

The first current converter DCDC1 is a bi-directional DCDC converter for converting high voltage direct current of the first battery VCC1 into low voltage direct current for providing to the first low voltage load R1 in the first low voltage grid. The first current converter DCDC1 has a first terminal, a second terminal, a third terminal and a fourth terminal. The first end of the first current converter DCDC1 is connected with the positive electrode of the first battery pack VCC1, the second end of the first current converter DCDC1 is connected with the negative electrode of the first battery pack VCC1, the third end of the first current converter DCDC1 is connected with a first power grid, and the fourth end of the first current converter DCDC1 is grounded.

The second current converter DCDC2 is a bi-directional DCDC converter for converting the high voltage direct current of the second battery VCC2 into a low voltage direct current for supply to the second low voltage load R2 in the second low voltage grid. The second current converter DCDC2 has a first terminal, a second terminal, a third terminal and a fourth terminal. The first end of the second current converter DCDC2 is connected with the positive electrode of the second battery set VCC2, the second end of the second current converter DCDC2 is connected with the negative electrode of the second battery set VCC2, the third end of the second current converter DCDC2 is connected with the second power grid, and the fourth end of the second current converter DCDC2 is grounded.

Because the first current converter DCDC1 and the second current converter DCDC2 are bidirectional DCDC converters, the first current converter DCDC1 and the second current converter DCDC2 can convert high-voltage direct current into low-voltage direct current, and can also convert the low-voltage direct current into high-voltage direct current, thereby supporting the electric quantity balance between the following first battery set VCC1 and the following second battery set VCC2, and also supporting the following first battery set VCC1 to discharge electric quantity for the second battery set VCC 2.

The isolating switch S4 is disposed between the first current converter DCDC1 and the second current converter DCDC2, and two ends of the isolating switch S4 are respectively connected with the third end of the first current converter DCDC1 and the third end of the second current converter DCDC 2. When the electric quantity of the first battery pack VCC1 is larger than that of the second battery pack VCC2, the isolating switch S4 is closed, and the electric quantity discharged by the first battery pack VCC1 can be discharged to the second battery pack VCC2 through the isolating switch S4 so as to realize electric quantity balance of the first battery pack VCC1 and the second battery pack VCC 2; some electric quantity that the first group of batteries VCC1 was released does not pass through isolator S4 and releases for first low-voltage network, and another part of electric quantity is released for the second low-voltage network through isolator S4, also can release more electric quantity than the second group of batteries VCC2 in the first group of batteries VCC1 to accomplish the electric quantity equilibrium between first group of batteries VCC1 and the second group of batteries VCC 2.

Through the above technical scheme, after the isolating switch S4 is closed, the first current converter DCDC1 can drain more electric quantity in the first battery VCC1 than the second battery VCC2 to the second battery VCC2 through the isolating switch S4, the first current converter DCDC1 can drain the surplus electric quantity in the first battery VCC1 to the low-voltage power grid through the isolating switch S4, and then drain the surplus electric quantity to the low-voltage load through the low-voltage power grid, the isolating switch S4 is used as an electric quantity transmission bridge between the first battery VCC1 and the second battery VCC2, and an electric quantity drainage bridge between the first battery VCC1 and the low-voltage load, so that the surplus electric quantity in the first battery VCC1 can be drained through the bridge, and the electric quantity in the first battery VCC1 can gradually approach the second battery VCC2, so that the electric quantity of the first battery VCC1 and the second battery VCC2 tend to be balanced.

In addition, in the related art, besides the first current converter DCDC1 and the second current converter DCDC2, an additional bidirectional current converter is required to be set and started to realize the electric quantity balance between the first battery set VCC1 and the second battery set VCC2, and the disclosure closes the isolating switch S4 to realize the release of the redundant electric quantity in the first battery set VCC1, so that the additional configuration and starting of the bidirectional current converter are not required, and the electric quantity balance cost is lower.

An example embodiment of the above-described power supply circuit is described below.

As can be seen from fig. 2, the third terminal of the first current converter DCDC1 is connected to the first low voltage network, and the third terminal of the first current converter DCDC1 is also connected to the second low voltage network via the isolating switch S4. In this way, the first current converter DCDC1 converts the high-voltage dc power received from the first battery VCC1 into the low-voltage dc power, and then supplies the low-voltage dc power to the first low-voltage power grid and the second low-voltage power grid at the same time.

Likewise, the third terminal of the second current converter DCDC2 is connected to the second low voltage network, and the third terminal of the second current converter DCDC2 is also connected to the first low voltage network through the isolating switch S4. In this way, the second current converter DCDC2 converts the high-voltage dc power received from the second battery VCC2 into the low-voltage dc power, and then supplies the low-voltage dc power to the first low-voltage power grid and the second low-voltage power grid at the same time.

The power supply circuit may further supply a third low voltage load R3, the third low voltage load R3 being a low voltage load commonly supplied between the first low voltage grid and the second low voltage grid. The first input end of the third low-voltage load R3 is connected with the first low-voltage power grid, and the second input end of the third low-voltage load R3 is connected with the second voltage power grid; the output end of the third low-voltage load R3 is grounded. In this way, the first low-voltage power network can supply power not only to the first low-voltage load R1 but also to the third low-voltage load R3; the second low-voltage network may supply not only the second low-voltage load R2 but also the third low-voltage load R3.

When the isolating switch S4 is not provided, the first current converter DCDC1 can only supply power to the first low-voltage network and the second current converter DCDC2 can only supply power to the second low-voltage network. In the driving process of the vehicle, the required electric quantity of the first low-voltage load R1 and the second low-voltage load R2 may be different, for example, the left turn signal of the vehicle is the first low-voltage load R1, the right turn signal of the vehicle is the second low-voltage load R2, and the left and right turn signals may cause the electric quantity consumed by the left turn signal to be different from the electric quantity consumed by the right turn signal due to the process, the service life and the like, so the required electric quantity of the first low-voltage load R1 may be different from the required electric quantity of the second low-voltage load R2.

Assuming that the power required by the first low-voltage load R1 is 150W and the power required by the second low-voltage load R2 is 50W, since the power of the low-voltage direct currents converted by the first current converter DCDC1 and the second current converter DCDC2 are the same, if the power of the low-voltage direct currents output by the first current converter DCDC1 and the second current converter DCDC2 after conversion is 100W, the power of 100W is provided to the first low-voltage load R1 and the second low-voltage load R2. The power required by the first low-voltage load R1 is 150W, and the power provided by the first current converter DCDC1 is 100W, which obviously cannot meet the power requirement of the first low-voltage load R1; the amount of power required by the second low voltage load R2 is 50W, and the amount of power provided by the second current converter DCDC2 is 100W, so that a portion of the low voltage dc power converted by the second current converter DCDC2 cannot be consumed by the second low voltage load R2.

In the disclosure, after the isolating switch S4 is set, the low-voltage direct current converted by the first current converter DCDC1 is not only output to the first low-voltage network, but also output to the second low-voltage network through the isolating switch S4, and since the first low-voltage network supplies power to the first low-voltage load R1 and the second low-voltage network supplies power to the second low-voltage load R2, the low-voltage direct current output by the first current converter DCDC1 is simultaneously supplied to the first low-voltage load R1 and the second low-voltage load R2; similarly, the low-voltage direct current converted by the second current converter DCDC2 is not only output to the second low-voltage power grid, but also output to the first low-voltage power grid through the isolating switch S4, so that the low-voltage direct current output by the second current converter DCDC2 is also simultaneously supplied to the first low-voltage load R1 and the second low-voltage load R2.

For example, if the low-voltage direct currents output by the first current converter DCDC 1and the second current converter DCDC2 after conversion are both 100W, the sum of the low-voltage direct currents output by the first current converter DCDC 1and the second current converter DCDC2 is 200W, and the sum of the low-voltage direct currents required by the first low-voltage load R1 and the second low-voltage load R2 is 200W, the low-voltage direct currents output by the two current converters after conversion can meet the power requirements of the two low-voltage loads. Therefore, after the isolating switch S4 is set, the first low-voltage load R1 and the second low-voltage load R2 compete for the low-voltage direct current output by the two current converters together, so as to meet the power requirements of the first low-voltage load R1 and the second low-voltage load R2.

The following describes a scenario in which the controller controls the first current converter DCDC1 and the second current converter DCDC2 to achieve different power balancing.

In a first scenario, the controller is configured to control the first current converter DCDC1 to output a first electric quantity to the first low-voltage power grid and the second low-voltage power grid, and control the second current converter DCDC2 to output a second electric quantity to the first low-voltage power grid and the second low-voltage power grid when the electric quantity of the first battery set VCC1 is greater than the electric quantity of the second battery set VCC 2; the first electric quantity is larger than the second electric quantity, and the sum of the first electric quantity and the second electric quantity is the target electric quantity required by the low-voltage load.

The first power supply ratio between the first electric quantity and the target electric quantity is larger than the second power supply ratio between the second electric quantity and the target electric quantity.

Referring to fig. 2, the power output from the first low voltage network may be transmitted to the first low voltage load R1 and the third low voltage load R3, the power output from the second low voltage network may be transmitted to the second low voltage load R2 and the third low voltage load R3, and then the total power required by the first low voltage load R1, the second low voltage load R2 and the third low voltage load R3 is the target power required by the low voltage loads.

Assuming that the target power is 200W, the first power supply ratio is 70%, the second power supply ratio is 30%, the first current converter DCDC1 converts 140W of low-voltage direct current to supply to the first low-voltage power grid after receiving the high-voltage direct current output by the first battery pack VCC1, and the second current converter DCDC2 converts 60W of low-voltage direct current to supply to the second low-voltage power grid after receiving the high-voltage direct current output by the second battery pack VCC2, so as to satisfy the total 200W of power required by the first low-voltage load R1 to the third low-voltage load R3.

Of course, the first power supply ratio and the second power supply ratio may be changed according to practical situations, which is not limited in the disclosure.

For example, the value of the first power supply ratio may be changed according to the voltage difference between the first battery VCC1 and the second battery VCC2, and when the voltage difference is larger, the first power supply ratio is larger, the corresponding second power supply ratio is smaller, that is, the voltage difference is larger, the first power amount is larger, and the corresponding second power amount is smaller, that is, the first power amount is larger. Therefore, when the electric quantity of the first battery pack VCC1 is larger, the first battery pack VCC1 supplies more electric quantity to the first low-voltage power grid and the second low-voltage power grid, and the first battery pack VCC1 supplies less electric quantity, so that the electric quantity of the first battery pack VCC1 and the electric quantity of the second battery pack VCC2 can reach balance more quickly.

In the first scenario, the electric power of the first battery VCC1 and the second battery VCC2 are changed in real time, so the electric power of the second battery VCC2 may be larger than the electric power of the first battery VCC1, and in this case, the electric power of the second battery VCC2 discharged to the low voltage load may be larger than the electric power of the first battery VCC1 discharged to the low voltage load by using the control flow, so as to ensure the electric power balance between the first battery VCC1 and the second battery VCC 2.

In a second scenario, the controller is configured to control the first current converter DCDC1 to output a third electric power to the first low-voltage power grid and the second low-voltage power grid when the electric power of the first battery VCC1 is greater than the electric power of the second battery VCC 2; wherein the third power amount is a target power amount required for the low-voltage load.

Referring to fig. 2, when the power of the first battery VCC1 is greater than the power of the second battery VCC2, the first current converter DCDC1 may be controlled to output a third power to the first low-voltage power grid and the second low-voltage power grid, so as to supply power to the first low-voltage load R1, the second low-voltage load R2 and the third low-voltage load R3, and the second current converter DCDC2 is controlled to be inactive, so that the power of the first battery VCC1 is gradually consumed by the low-voltage loads in the low-voltage power grid, and the power of the second battery VCC2 is kept unchanged, so that the power of the first battery VCC1 may be gradually discharged to be close to the first battery VCC1, so as to ensure that the power of the first battery VCC1 and the second battery VCC2 is balanced.

It is understood that the third power amount is the total target power amount required by the first low voltage load R1, the second low voltage load R2 and the third low voltage load R3.

In the second scenario, the electric power of the first battery VCC1 and the second battery VCC2 are changed in real time, so that the electric power of the second battery VCC2 may be larger than the electric power of the first battery VCC1, and in this case, the control flow may also be used to let the electric power of the second battery VCC2 bleed off to the low voltage load, so that the electric power of the second battery VCC2 gradually approaches the electric power of the first battery VCC1, so as to ensure electric power balance between the first battery VCC1 and the second battery VCC 2.

In a third scenario, the controller is configured to control, when the electric quantity of the first battery VCC1 is greater than the electric quantity of the second battery VCC2, the electric quantity of the first battery VCC1 to be transmitted to the second battery VCC2 through the isolating switch S4.

Referring to fig. 3, two ends of the isolation switch S4 are respectively connected to the third terminal of the first current converter DCDC1 and the third terminal of the second current converter DCDC 2. The first current converter DCDC1 may be controlled to operate in a buck mode and the second current converter DCDC2 may be controlled to operate in a boost mode, and a power transmission bridge between the first current converter DCDC1 and the second current converter DCDC2 may be established through the isolating switch S4.

The first current converter DCDC1 converts high-voltage direct current of the first battery pack VCC1 into low-voltage direct current in a buck mode and inputs the low-voltage direct current into a first power grid; the first low-voltage power grid transmits low-voltage direct current to the second low-voltage power grid through the isolating switch S4, and the second low-voltage power grid transmits low-voltage direct current to the second current converter DCDC2; the second current converter DCDC2 converts the low-voltage direct current into the high-voltage direct current and transmits the high-voltage direct current to the second battery VCC2 in the boost mode. In this way, the first battery pack VCC1 is used for supplying power to the second battery pack VCC2, the first battery pack VCC1 supplements the released electric quantity to the second battery pack VCC2, the electric quantity of the first battery pack VCC1 is gradually reduced, and the electric quantity of the second battery pack VCC2 is gradually increased, so that the electric quantity of the first battery pack VCC1 and the electric quantity of the second battery pack VCC2 tend to be balanced. In this process, the isolating switch S4 functions as a power transfer channel to transfer the power of the first battery VCC1 into the second battery VCC2.

In the third scenario, the electric power of the first battery VCC1 and the second battery VCC2 are changed in real time, so the electric power of the second battery VCC2 may be larger than the electric power of the first battery VCC1, and in this case, the above control procedure may be used to transfer part of the electric power of the second battery VCC2 into the first battery VCC1 through the isolating switch S4, so that the electric power of the first battery VCC1 and the electric power of the second battery VCC2 tend to be balanced.

Through the technical scheme, through the scheme in the first scene, the first battery pack VCC1 and the second battery pack VCC2 can supply power to the low-voltage load at the same time, and the power supplied by the first battery pack VCC1 is larger than that supplied by the second battery pack VCC2, and on the basis that the power of the first battery pack VCC1 and the power of the second battery pack VCC2 tend to be balanced, the service lives of the first battery pack VCC1 and the second battery pack VCC2 are identical because the first battery pack VCC1 and the second battery pack VCC2 operate at the same time, and the service lives of the first battery pack VCC1 and the second battery pack VCC2 are more consistent, so that the problem of unbalanced power caused by different service lives of the first battery pack VCC1 and the second battery pack VCC2 is further reduced; through the scheme in the second scene, the first battery pack VCC1 can independently supply power for the low-voltage load, the electric quantity of the first battery pack VCC1 can be discharged more quickly, and the electric quantity of the first battery pack VCC1 and the electric quantity of the second battery pack VCC2 tend to be balanced more quickly; through the scheme under the third scene, the electric quantity of the first battery pack VCC1 can be transferred to the second battery pack VCC2, so that the electric quantity of the first battery pack VCC1 is gradually reduced, the electric quantity of the second battery pack VCC2 is gradually increased, the electric quantity of the first battery pack VCC1 and the electric quantity of the second battery pack VCC2 are balanced finally, the electric quantity of the first battery pack VCC1 and the electric quantity of the second battery pack VCC2 are not required to be consumed by a low-voltage load, and the electric quantity of the second battery pack VCC2 can be balanced. Among the above three schemes, the first two schemes require the low-voltage load to consume the electric quantity of the first battery pack VCC1, which belongs to passive electric quantity balancing, and the latter scheme does not require the low-voltage load to consume the electric quantity, and can realize electric quantity balancing between the first battery pack VCC1 and the second battery pack VCC2, which belongs to active electric quantity balancing.

Some operation scenarios of the power supply circuit without power equalization are described below.

Referring to fig. 4, in a first operation scenario, when the high-voltage power network is normal, the circuit breaking device S1 is in a closed state, the first battery VCC1 and the second battery VCC2 are in a series state, and the first battery VCC1 and the second battery VCC2 operate independently, the first battery VCC1 inputs the output electric quantity to the first current converter DCDC1, and the second battery VCC2 inputs the output electric quantity to the second current converter DCDC2.

When the high-voltage power grid is abnormal, the circuit breaking device S1 is in an off state, at this time, the first battery set VCC1 and the second battery set VCC2 are not in a series state, and the first battery set VCC1 also inputs electric quantity to the first current converter DCDC1, and the second battery set VCC2 also inputs electric quantity to the second current converter DCDC2, so as to supply power to the low-voltage load.

In the related art, the first current converter DCDC1 and the second current converter DCDC2 are connected in parallel to two ends of the high-voltage load on the right side, when the breaking device S1 is disconnected, the first current converter DCDC1 and the second current converter DCDC2 are powered off, so that the first current converter DCDC1 and the second current converter DCDC2 cannot normally operate, and at this time, the first current converter DCDC1 and the second current converter DCDC2 cannot convert low-voltage direct current to supply to the low-voltage power grid, which results in that the low-voltage load in the low-voltage power grid cannot operate.

In the disclosure, referring to fig. 4, a first current converter DCDC1 is distributed and connected to the left side of a first high-voltage battery set and connected to a first low-voltage power grid, a second current converter DCDC2 is distributed and connected to the left side of a second high-voltage battery set and connected to a second low-voltage power grid, even if the circuit breaking device S1 is disconnected, the first current converter DCDC1 can receive the high-voltage direct current input by the first battery set VCC1 and convert it into the low-voltage direct current to supply to the first low-voltage power grid, and the second current converter DCDC2 can also receive the high-voltage direct current input by the second battery set VCC2 and convert it into the low-voltage direct current to supply to the second low-voltage power grid, so that the low-voltage loads connected to the first low-voltage power grid and the second low-voltage power grid have the same low-voltage direct current input, and these low-voltage loads can also operate normally.

In the second working scenario, when the isolating switch S4 is closed, the first low-voltage power grid and the second low-voltage power grid are in grid-connected operation, and when at least one of the first current converter DCDC1 and the second current converter DCDC2 works, the low-voltage system can normally operate.

For example, if the first current converter DCDC1 works alone, the first current converter DCDC1 outputs the output low-voltage direct current to the first low-voltage power grid, and outputs the output low-voltage direct current to the second low-voltage power grid through the isolating switch S4, so as to ensure the normal operation of the low-voltage system.

If the second current converter DCDC2 works independently, the second current converter DCDC2 outputs the output low-voltage direct current to the second low-voltage power grid, and outputs the output low-voltage direct current to the first low-voltage power grid through the isolating switch S4, so that the normal operation of the low-voltage system is ensured.

When the first low-voltage power grid and/or the second low-voltage power grid fail, the controller turns off the isolating switch S4, thereby rapidly isolating the failed low-voltage power grid.

For example, referring to fig. 5, if the second low-voltage power network fails, after the isolating switch S4 is turned off, the current output from the first current converter DCDC1 is output to the first low-voltage power network, but not to the second low-voltage power network, and the first low-voltage power network supplies power to the first low-voltage load R1 and the third low-voltage load R3.

Referring to fig. 6, if the first low-voltage power network fails, after the isolating switch S4 is turned off, the current output from the second current converter DCDC2 is output to the second low-voltage power network, but not to the first low-voltage power network, and the second low-voltage power network supplies power to the second low-voltage load R2 and the third low-voltage load R3.

When the high voltage system fails, the circuit breaking device S1 is opened, and the high voltage system failure may be any failure of the high voltage power grid and the high voltage load. Taking the high-voltage load short circuit as an example, after the high-voltage load short circuit, the resistance of the circuit where the high-voltage load is located is almost 0, and the voltages at the two ends of the high-voltage load are 0 at the moment, so that the voltages at the two ends of the first battery set VCC1 and the second battery set VCC2 are also 0, and under the condition that the first battery set VCC1 and the second battery set VCC2 cannot output high-voltage direct current, the first current converter DCDC1 and the second current converter DCDC2 cannot output low-voltage direct current, so that the low-voltage power grid cannot be normally supplied, and the low-voltage battery VCC3 can be controlled to supply power for the low-voltage load at the moment.

Referring to fig. 7, the positive electrode of the low-voltage battery VCC3 is connected to the first low-voltage network, and is connected to the second low-voltage network through a disconnecting switch S4, and the negative electrode of the low-voltage battery VCC3 is grounded. In this way, the low-voltage direct current output from the low-voltage battery VCC3 may be output to the first and second low-voltage power grids, thereby supplying power to the first, second, and third low-voltage loads R1, R2, and R3.

When at least one of the first battery set VCC1 and the second battery set VCC2 recovers the electric quantity, at least one of the first current converter DCDC1 and the second current converter DCDC2 can output low-voltage direct current, and at this time, the low-voltage direct current output by at least one of the first current converter DCDC1 and the second current converter DCDC2 can be controlled to supply power to the low-voltage load without the need of the low-voltage battery VCC 3.

Fig. 8 is a power supply circuit control method according to an exemplary embodiment, the method including the steps of:

In step S11, the electric quantity of the first battery pack and the electric quantity of the second battery pack are determined.

The charge of the first battery pack refers to the voltage or the remaining charge of the first battery pack, and the charge of the second battery pack refers to the voltage or the remaining charge of the second battery pack.

In step S21, in the case where the electric quantity of the first battery pack is larger than the electric quantity of the second battery pack, any one of the following (1), (2) and (3) is performed:

(1) And controlling the first current converter, discharging the electric quantity of the first battery pack to the second current converter through the isolating switch, and controlling the second current converter to discharge the electric quantity of the first battery pack to the second battery pack.

The method may include controlling the first battery pack to discharge electric quantity to the second battery pack, so that the electric quantity of the first battery pack is reduced, and when the electric quantity of the first battery pack is monitored to be equal to the electric quantity of the second battery pack, stopping controlling the first current converter to output the electric quantity of the first battery pack to the second current converter, and stopping controlling the second current converter to output the electric quantity of the first battery pack to the second battery pack.

(2) And controlling the first electric quantity of the first battery pack discharged by the first current converter to be larger than the second electric quantity of the second battery pack discharged by the second current converter.

The first electric quantity of the first battery pack discharged to the low-voltage load is controlled to be larger than the second electric quantity of the second battery pack discharged to the low-voltage load, and when the electric quantity of the first battery pack and the electric quantity of the second battery pack are monitored to be equal, the first battery pack and the second battery pack are controlled to be supplied to the low-voltage load with the same electric quantity.

(3) And controlling the first current converter to discharge the electric quantity of the first battery pack to a low-voltage load.

The first battery pack may be controlled to discharge electric quantity to the low-voltage load, and the second battery pack may not be controlled to discharge electric quantity to the low-voltage load.

Through the control method of the power supply circuit, when the electric quantity of the first battery pack is larger than that of the second battery pack, the electric quantity of the first battery pack is discharged to the second battery pack, or the electric quantity of the first battery pack is discharged to the low-voltage load, or the electric quantity of the first battery pack discharged to the low-voltage load is larger than that of the second battery pack discharged to the low-voltage load, so that the electric quantity of the first battery pack is gradually reduced to be close to that of the second battery pack, and the electric quantities of the first battery pack and the second battery pack are balanced.

Optionally, in case of a fault of the first low voltage grid and/or the second voltage grid, the disconnecting switch is controlled to be opened.

Under the condition that any one of the first low-voltage power grid and the second low-voltage power grid fails, the isolating switch can be controlled to be disconnected, so that the failure low-voltage power grid is prevented from affecting the normal operation of the low-voltage power grid.

Optionally, in the case that the first battery pack and the second battery pack cannot output electric quantity, controlling the first low-voltage power supply network to supply power to the second low-voltage power supply network through the isolating switch.

When the high-voltage system faults cause the breaking device to break, the first battery pack and the second battery pack cannot output electric quantity at the moment, so that the first low-voltage power grid and the second low-voltage power grid can be controlled to be continuously supplied with power, and the low-voltage load can still normally run when the breaking device breaks.

Fig. 9 is a block diagram of a power supply circuit control device according to an exemplary embodiment. Referring to fig. 9, the power supply circuit control device 900 includes: the determination module 910 and the control module 920.

A determination module 910 configured to determine an amount of power of the first battery pack and an amount of power of the second battery pack;

A control module 920 configured to perform any one of the following in case the electric quantity of the first battery pack is greater than the electric quantity of the second battery pack:

Controlling the first current converter, discharging the electric quantity of the first battery pack to the second current converter through the isolating switch, and controlling the second current converter to discharge the electric quantity of the first battery pack to the second battery pack;

controlling a first electric quantity of the first battery pack discharged by the first current converter to be larger than a second electric quantity of the second battery pack discharged by the second current converter;

and controlling the first current converter to discharge the electric quantity of the first battery pack to a low-voltage load.

Optionally, the control module 920 includes:

A first control sub-module configured to control the first current converter to discharge a first electric quantity to a first low-voltage power grid and a second low-voltage power grid and control the second current converter to discharge a second electric quantity to the first low-voltage power grid and the second low-voltage power grid when the electric quantity of the first battery pack is larger than the electric quantity of the second battery pack;

The first electric quantity is larger than the second electric quantity, the first low-voltage power network is used for supplying power to a first low-voltage load, and the second low-voltage power network is used for supplying power to a second low-voltage load.

Optionally, the power supply circuit control device 900 includes:

and the switch control module is configured to control the disconnecting switch to be opened under the condition that the first low-voltage power grid and/or the second voltage power grid are/is in fault.

Optionally, the power supply circuit control device 900 includes:

and the power supply control module is configured to control the battery to supply power to the first low-voltage power grid and supply power to the second low-voltage power grid through the isolating switch under the condition that the first battery pack and the second battery pack cannot output electric quantity.

The specific manner in which the various modules perform the operations in the apparatus of the above embodiments have been described in detail in connection with the embodiments of the method, and will not be described in detail herein.

The present disclosure also provides a computer readable storage medium having stored thereon computer program instructions which, when executed by a processor, implement the steps of the power supply circuit control method provided by the present disclosure.

The disclosure further provides a power supply system, which comprises the power supply circuit.

Fig. 10 is a block diagram of a vehicle 1000, according to an exemplary embodiment. For example, the vehicle 1000 may be a hybrid vehicle, or may be a non-hybrid vehicle, an electric vehicle, a fuel cell vehicle, or other type of vehicle. The vehicle 1000 may be an autonomous vehicle, a semi-autonomous vehicle, or a non-autonomous vehicle.

Referring to fig. 10, a vehicle 1000 may include various subsystems, such as an infotainment system 1010, a perception system 1020, a decision control system 1030, a drive system 1040, and a computing platform 1050. Wherein the vehicle 1000 may also include more or fewer subsystems, and each subsystem may include multiple components. In addition, interconnections between each subsystem and between each component of the vehicle 1000 may be achieved by wired or wireless means.

In some embodiments, the infotainment system 1010 may include a communication system, an entertainment system, a navigation system, and the like.

The sensing system 1020 may include several sensors for sensing information of the environment surrounding the vehicle 1000. For example, the sensing system 1020 may include a global positioning system (which may be a GPS system, a beidou system, or other positioning system), an inertial measurement unit (inertial measurement unit, IMU), a lidar, millimeter wave radar, an ultrasonic radar, and a camera device.

Decision control system 1030 may include a computing system, a vehicle controller, a steering system, a throttle, and a braking system.

The drive system 1040 may include components that provide powered movement of the vehicle 1000. In one embodiment, the drive system 1040 may include an engine, an electrical power source, a transmission, and wheels. The engine may be one or a combination of an internal combustion engine, an electric motor, an air compression engine. The engine is capable of converting the electrical power provided by the electrical power source into mechanical electrical power.

Some or all of the functions of the vehicle 1000 are controlled by the computing platform 1050. The computing platform 1050 may include at least one processor 1051 and memory 1052, the processor 1051 may execute instructions 1053 stored in the memory 1052.

Processor 1051 may be any conventional processor, such as a commercially available CPU. The processor may also include, for example, an image processor (Graphic Process Unit, GPU), a field programmable gate array (Field Programmable GATE ARRAY, FPGA), a System On Chip (SOC), an Application SPECIFIC INTEGRATED Circuit (ASIC), or a combination thereof.

Memory 1052 may be implemented by any type of volatile or nonvolatile memory device or combination thereof, such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disk.

In addition to instructions 1053, memory 1052 may store data such as road maps, route information, vehicle position, direction, speed, and the like. The data stored by memory 1052 may be used by computing platform 1050.

In an embodiment of the present disclosure, processor 1051 may execute instructions 1053 to perform all or part of the steps of the power circuit control method described above.

It is appreciated that a power supply system may be configured on the vehicle 1000 that may power the low voltage loads and low voltage loads in the infotainment system 1010, the perception system 1020, the decision control system 1030, and the drive system 1040 to ensure operation of the vehicle 1000.

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

It is to be understood that the present disclosure is not limited to the precise arrangements and instrumentalities shown in the drawings, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A power supply circuit, comprising: the battery comprises a first battery pack, a second battery pack, a first current converter, a second current converter and an isolating switch;

2. The power supply circuit of claim 1, wherein a third terminal of the first current converter is connected to a first low voltage network and to a second low voltage network through the isolation switch; the third end of the second current converter is connected with a second low-voltage power grid and is connected with the first low-voltage power grid through the isolating switch;

3. The power supply circuit of claim 2, further comprising a controller;

4. The power supply circuit of claim 2, further comprising a controller;

5. The power supply circuit of claim 1, further comprising a controller;

6. The power supply circuit of claim 1, wherein a circuit breaking device is connected between the first battery pack and the second battery pack;

7. The power supply circuit of claim 2, further comprising a controller;

8. The power supply circuit of claim 2, further comprising a low voltage battery;

9. The power supply circuit according to any one of claims 1 to 8, wherein the first current converter and the second current converter are both bidirectional current converters.

10. A power supply system, characterized in that the power supply system comprises a power supply circuit as claimed in any one of claims 1 to 9.

11. A vehicle, characterized in that the vehicle is provided with the power supply system according to claim 10.