WO2023226907A1

WO2023226907A1 - Power source circuit, vehicle-mounted power source system, and vehicle

Info

Publication number: WO2023226907A1
Application number: PCT/CN2023/095406
Authority: WO
Inventors: 蒋观峰; 李正军; 金启前
Original assignee: 武汉路特斯汽车有限公司
Priority date: 2022-05-24
Filing date: 2023-05-19
Publication date: 2023-11-30
Also published as: CN117154860A

Abstract

Provided in the present application are a power source circuit, a vehicle-mounted power source system, and a vehicle. The power source circuit comprises a first battery pack, a second battery pack, a positive output end and a negative output end, wherein the first battery pack comprises a first positive-electrode end and a first negative-electrode end; the second battery pack comprises a second positive-electrode end and a second negative-electrode end; and the first negative-electrode end is connected to the second positive-electrode end, the first positive-electrode end is connected to the positive output end, and the second negative-electrode end is connected to the negative output end. By using the power source circuit, the vehicle-mounted power source system and the vehicle, which are provided in the present application, not only can the power source circuit continuously supply power in the case when thermal runaway occurs in a power battery or an open circuit occurs in a certain string of cells in the power battery, but the problem of unbalanced capacities of a first battery pack and a second battery pack resulting from an electric module can also be solved.

Description

A power circuit, a vehicle power supply system and a vehicle

This patent application requires the application number 202210569430. Right, the entire text of the above application is incorporated into this application by reference.

Technical field

This application relates to the technical field of new energy vehicle power batteries, and specifically relates to a power supply circuit, a vehicle power supply system and a vehicle.

Background technique

In the existing new energy vehicle power battery system, when a certain cell in the high-voltage assembled battery experiences thermal runaway or other problems, the high-voltage assembled battery will not be able to supply power normally or even if the high-voltage assembled battery can still supply power, however During the power supply process, the capacity of different cells in the high-voltage combined battery will be unbalanced, which will lead to a decrease in the cruising range and cycle life of the high-voltage combined battery.

Technical solutions

This application provides a power circuit, a vehicle power supply system and a vehicle, which are used to alleviate the problems of the power circuit being unable to continuously supply power and the battery cell capacity being unbalanced when an abnormality occurs in the high-voltage battery.

In one aspect, the present application provides a power circuit. Optionally, the power circuit includes a first battery pack, a second battery pack, a positive output terminal and a negative output terminal;

The first battery pack includes a first positive terminal and a first negative terminal;

The second battery pack includes a second positive terminal and a second negative terminal;

The first negative terminal is connected to the second positive terminal, the first positive terminal is connected to the positive output terminal, and the second negative terminal is connected to the negative output terminal;

The first battery pack includes at least one first cell, and there is at least one first cell that satisfies the following requirements: a first one-way conductive branch is provided between the negative terminal of the first cell and the positive output terminal. path, the conduction direction of the first one-way conduction branch is from one end of the first one-way conduction branch connecting the first cell to the connection direction of the first one-way conduction branch One end of the positive output;

The second battery pack includes at least one second cell, and there is at least one second cell that satisfies the following requirements: a second unidirectional conductive branch is provided between the positive terminal of the second cell and the negative output terminal. path, the conduction direction of the second one-way conduction branch is from one end of the second one-way conduction branch connected to the negative output end to the end of the second one-way conduction branch connected to the second One end of the cell.

Optionally, the first unidirectional conductive branch is provided between the first negative terminal and the positive output terminal in the power circuit.

Optionally, the second unidirectional conductive branch is provided between the second positive terminal and the negative output terminal in the power circuit.

Optionally, the power supply circuit further includes a first power supply interface terminal and a power supply second interface terminal, the power supply first interface terminal is connected to the first positive terminal, and the power supply second interface terminal is connected to the second power supply terminal. Negative terminal connection.

Optionally, the power circuit further includes a first relay unit, and the first interface terminal of the power supply and the first positive terminal are connected through the first relay unit.

Optionally, the power circuit further includes a second relay unit, and the second interface terminal of the power supply and the second negative terminal are connected through the second relay unit.

Optionally, the power circuit further includes a third one-way conduction branch, the first positive terminal and the positive output terminal are connected through the third one-way conduction branch, and the third one-way conduction branch The conduction direction is from the first positive terminal to the positive output terminal.

Optionally, the power circuit further includes a fourth one-way conduction branch, the second negative terminal is connected to the negative output terminal through the fourth one-way conduction branch, and the fourth one-way conduction branch The conduction direction is from the negative output terminal to the second negative terminal.

Optionally, among the first one-way conduction branch, the second one-way conduction branch, the third one-way conduction branch and the fourth one-way conduction branch in the power circuit At least one of includes at least one of a diode, a field effect transistor, a transistor, and a relay.

Optionally, the power circuit further includes a power module, the power module includes a positive input terminal and a negative input terminal; the positive output terminal is connected to the positive input terminal, and the negative output terminal is connected to the negative input terminal. Input connection.

Optionally, the power module in the power circuit is at least one of a DC-to-DC unit, a DC-to-AC unit, or a power-consuming unit.

Optionally, the first battery pack in the power circuit is connected to at least two of the first one-way conduction branches, and/or the second battery pack is connected to at least two of the second one-way conduction branches. branch road.

On the other hand, this application also provides a power supply circuit. Optionally, the power supply circuit includes a first battery pack, a second battery pack, a positive output terminal and a negative output terminal;

The first battery pack includes at least one first cell, and there is at least one first cell that satisfies the following requirements: a first one-way conductive branch is provided between the negative terminal of the first cell and the positive output terminal. path, the conduction direction of the first one-way conduction branch is from one end of the first one-way conduction branch connecting the first cell to the connection direction of the first one-way conduction branch One end of the positive output.

On the other hand, this application also provides a vehicle power supply system, which optionally includes the power circuit as described above.

On the other hand, the present application also provides a vehicle, optionally including the power supply circuit as described above.

As mentioned above, the power circuit, vehicle power supply system and vehicle provided by this application enable the power circuit to continue to provide power when the power battery experiences thermal runaway or a certain string of cells in the power battery breaks.

Description of the drawings

Figure 1 is a structural diagram of a power supply circuit according to the first embodiment of the present application.

FIG. 2 is an equivalent circuit diagram of the power circuit of the embodiment of FIG. 1 when only the first battery cell is faulty.

FIG. 3 is an equivalent circuit diagram of the power circuit of the embodiment of FIG. 1 when only the second battery cell is faulty.

FIG. 4 is a structural diagram of a power circuit based on FIG. 1 according to the first embodiment of the present application.

FIG. 5 is a structural diagram of the power circuit based on FIG. 4 according to the first embodiment of the present application.

FIG. 6 is a structural diagram of a power supply circuit according to the second embodiment of the present application.

Figure 7 is a structural diagram of a power supply circuit according to the third embodiment of the present application.

The realization of the purpose, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. Through the above-mentioned drawings, clear embodiments of the present application have been shown, which will be described in more detail below. These drawings and text descriptions are not intended to limit the scope of the present application's concepts in any way, but are intended to illustrate the application's concepts for those skilled in the art with reference to specific embodiments.

Implementation Mode of this Application

Exemplary embodiments will be described in detail herein, examples of which are illustrated in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings refer to the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with this application. Rather, they are merely examples of apparatus and methods consistent with aspects of the application as detailed in the appended claims.

It should be noted that, in this document, the terms "comprising", "comprises" or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article or device that includes a series of elements not only includes those elements, It also includes other elements not expressly listed or inherent in the process, method, article or apparatus. Without further limitation, an element defined by the statement "comprises a..." does not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, the application may be implemented differently. Components, features, and elements with the same names in the examples may have the same meaning or may have different meanings. Their specific meanings need to be determined based on their interpretation in the specific embodiment or further combined with the context of the specific embodiment.

It should be understood that the specific embodiments described here are only used to explain the present application and are not used to limit the present application.

First embodiment

In one aspect, the present application provides a power supply circuit. FIG. 1 is a structural diagram of the power supply circuit according to the first embodiment of the present application. Referring to Figure 1, the power circuit includes a first battery pack 10, a second battery pack 20, a positive output terminal S+ and a negative output terminal S-.

The first battery pack 10 includes a first positive terminal and a first negative terminal. The second battery pack 20 includes a second positive terminal and a second negative terminal. The first negative terminal is connected to the second positive terminal, the first positive terminal is connected to the positive output terminal S+, and the second negative terminal is connected to the negative output terminal S-.

The first battery pack 10 includes at least one first battery cell 11, and there is at least one first battery cell 11 that satisfies the following requirements: a first unidirectional conductive branch D1 is provided between the negative terminal of the first battery cell 11 and the positive output terminal S+, The conduction direction of the first one-way conduction branch D1 is from one end of the first one-way conduction branch D1 connected to the first battery cell 11 to one end of the first one-way conduction branch D1 connected to the positive output terminal S+.

The second battery pack 20 includes at least one second battery cell 21, and there is at least one second battery cell 21 that satisfies the following requirements: a second unidirectional conductive branch D2 is provided between the positive terminal of the second battery cell 21 and the negative output terminal S-. , the conduction direction of the second one-way conduction branch D2 is from one end of the second one-way conduction branch D2 connected to the negative output terminal S- to one end of the second one-way conduction branch D2 connected to the second battery cell 21 .

For example, this application does not limit the number of the first battery cells 11 in the first battery pack 10 and the second battery cells 21 in the second battery pack 20 . A plurality of first battery cells 11 and second battery cells 12 may be provided according to the power requirements of the automobile. FIG. 1 shows only one first battery cell 11 and one second battery cell 21 . When the first battery core 11 and the second battery core 21 do not malfunction, due to the voltage difference between the two ends of each battery core, the first one-way conduction branch D1 and the second one-way conduction branch D2 cannot conduct, thus causing The cells in the battery pack use the same current to output voltage to the output terminal of the power circuit at the same time, which can avoid the uneven power battery problem caused by the different losses of each cell due to different currents. Optionally, the first battery pack 10 and the second battery pack 20 may be connected through a relay or a fuse to protect the safety of the power supply circuit. The relay or fuse is not shown in FIG. 1 .

The above conduction direction refers to the one-way conduction direction of the first one-way conduction branch D1 and the second one-way conduction branch D2 in the power supply state. In another embodiment, using the circuit principle provided by this application, during reverse charging, at least one conductive branch can also be used to reversely charge the battery core through the reverse conductive branch. It should be noted that the first negative terminal is the negative terminal of the first cell closest to the second battery pack. The first one-way conduction branch D1 or the second one-way conduction branch D2 is not limited to a certain conduction branch. Any one that meets the above conditions can become the first one-way conduction branch D1 or the second one-way conduction branch D2. D2. Through the above power supply circuit, when the first battery pack 10 has a cell failure, the second battery pack 20 can still operate normally, or when the second battery pack 20 has a cell failure, the first battery pack 10 can still operate normally. .

Please refer to Figure 2. For example, when the first battery core 11 fails and the second battery core 21 works normally, the first one-way conduction branch D1 is conductive, and the second one-way conduction branch D2 cannot be conductive. That is, the second battery core 21 can still output voltage to the output terminal of the power circuit, ensuring that the power circuit can continue to provide normal power supply.

Please refer to Figure 3. For example, when the second battery core 21 fails and the first battery core 11 works normally, the first one-way conduction branch D1 cannot conduct, and the second one-way conduction branch D2 conducts. That is, the first battery cell 11 can still output voltage to the output terminal of the power circuit, ensuring that the power circuit can continue to provide normal power supply.

In this embodiment, by adding two one-way conduction branches to the power circuit, it can not only solve the problem of being unable to output voltage normally when the power battery is abnormal, but also solve the problem of unbalanced capacity of the first battery cell 11 and the second battery cell 21 It has the advantages of simple and reliable structural design, low cost and light weight.

Please continue to refer to FIG. 1 . In one embodiment, a first unidirectional conductive branch D1 is provided between the first negative terminal and the positive output terminal S+ in the power circuit.

For example, when the first battery pack 10 fails and causes the power circuit to be powered off, the conduction of the first unidirectional conduction branch D1 can ensure that the second battery pack 20 can still operate normally to output voltage to the output end of the power circuit. .

Please continue to refer to FIG. 1 . In one embodiment, a second unidirectional conductive branch D2 is provided between the second positive terminal and the negative output terminal S- in the power circuit.

For example, when the second battery pack 20 fails and causes the power circuit to be powered off, the conduction of the second unidirectional conduction branch D2 can ensure that the first battery pack 10 can still operate normally to output voltage to the output end of the power circuit. .

Please refer to Figure 4. In one embodiment, the power circuit also includes a first power interface terminal 40 and a second power interface terminal 41. The first power interface terminal 40 is connected to the first positive terminal, and the second power interface terminal 41 is connected to the first positive terminal. The two negative terminals are connected.

For example, the first power interface terminal 40 and the second power interface terminal 41 form a power interface circuit by connecting the first battery group 10 and the second battery group 20 to provide power to the first battery group 10 and the second battery group 20 . The power interface circuit is an external power supply circuit, and the external power supplies power to the first battery pack 10 and the second battery pack 20 through the first power interface terminal 40 and the second power interface terminal 41 . It should be noted that this application does not limit the size of the power supply voltage at the power interface. The size of the power supply voltage can be selected from any value larger than the output voltage of the output terminal of the power circuit.

For example, the first power interface terminal 40 and the second power interface terminal 41 may be respectively a positive bus terminal and a negative bus terminal connected to the high-voltage circuit.

Please continue to refer to FIG. 4 . In one embodiment, the power circuit further includes a first relay unit 50 . The first interface terminal 40 of the power supply and the first positive terminal are connected through the first relay unit 50 .

Please continue to refer to FIG. 4 . In one embodiment, the power circuit further includes a second relay unit 51 , and the second interface terminal 41 of the power supply and the second negative terminal are connected through the second relay unit 51 .

For example, the first relay unit 50 and the second relay unit 51 are used to control on/off of the power interface circuit to protect the safety of the power interface circuit. The first relay unit 50 also includes a precharge relay and a precharge resistor, which are not shown in FIG. 4 . The precharge circuit plays a role in protecting the first relay unit 50 during the early stages of charging and discharging of the power interface circuit. By controlling the on/off of the first relay unit 50 and the second relay unit 51, the power interface circuit can be implemented to supply power to the first battery pack 10 and the second battery pack 20 or not.

Please continue to refer to Figure 4. In one embodiment, the power circuit further includes a third one-way conduction branch D3. The first positive terminal and the positive output terminal S+ are connected through the third one-way conduction D3. The third one-way conduction branch The conduction direction of D3 is from the first positive terminal to the positive output terminal S+.

Please continue to refer to Figure 4. In one embodiment, the power circuit further includes a fourth one-way conduction branch D4. The second negative terminal and the negative output terminal S- are connected through the fourth one-way conduction D4. The fourth one-way conduction branch D4 The conduction direction of branch D4 is from the negative output terminal S- to the second negative terminal.

For example, when the first one-way conduction branch D1 and/or the second one-way conduction branch D2 fails and causes a short circuit in the power circuit, through the third one-way conduction branch D3 and the fourth one-way conduction branch D3 provided in the power circuit One-way conduction branch D4 can ensure the stability and reliability of the power circuit.

In an embodiment, at least one of the first unidirectional conduction branch D1, the second unidirectional conduction branch D2, the third unidirectional conduction branch D3 and the fourth unidirectional conduction branch D4 in the power circuit includes At least one of a diode, a field effect transistor, a transistor, and a relay.

It should be noted that in the above embodiment, the first one-way conduction branch D1, the second one-way conduction branch D2, the third one-way conduction branch D3 and the fourth one-way conduction branch D4 are at the output of the power circuit. When the terminal outputs voltage, it is a one-way conduction direction. The first one-way conduction branch D1, the second one-way conduction branch D2, the third one-way conduction branch D3, and the fourth one-way conduction branch D4 may be selected from at least one of a diode, a field effect transistor, a transistor, and a relay. A sort of. This application does not limit the type of one-way branch road. Switching devices such as diode circuits, field effect tube circuits, transistor circuits, and relay circuits can all meet the requirements of continuous normal power supply and stable operation of power circuits under appropriate control.

In one embodiment, please continue to refer to FIG. 4 , the power circuit further includes a power module 30 . The power module 30 includes a positive input terminal and a negative input terminal. The positive output terminal S+ is connected to the positive input terminal, and the negative output terminal S- is connected to the negative input terminal. Optionally, the power module 30 may be a load unit or a power conversion unit. For example, the load unit is a power-consuming unit, which can be configured as an electronic device, a battery pack, or other power-consuming device. The power conversion unit is a DC-to-DC unit or a DC-to-AC unit. In the power battery system of new energy vehicles, the DC conversion module is the core component of the power supply circuit of new energy vehicles. The 12V/24V/48V electrical equipment of new energy vehicles mainly relies on the DC conversion module to provide stable and reliable energy, especially in When an abnormality occurs in the high-voltage combined battery, the power circuit provided by the embodiment of the present application can effectively ensure that the DC conversion module can also operate normally.

For example, this application does not limit the type of the power module 30 . It can be set as a DC-to-DC unit, a DC-to-AC unit or a power consumption unit according to the vehicle's power demand.

In one embodiment, the first battery pack 10 in the power circuit is connected to at least two first unidirectional conduction branches D1. It should be noted that, among at least two first unidirectional conduction branches D1, one first unidirectional conduction branch D1 must be disposed between the first negative terminal of the first battery pack 10 and the positive output terminal S+. When the first battery pack 10 fails and the power circuit is cut off, at least one first unidirectional conduction branch D1 is conductive to ensure that the second battery pack 20 can still operate normally and supply power to the power module 30 .

In one embodiment, the second battery pack 20 in the power circuit is connected to at least two second unidirectional conductive branches D2. It should be noted that, among at least two second unidirectional conduction branches D2, one second unidirectional conduction branch D2 must be disposed between the second positive terminal of the second battery pack 20 and the negative output terminal S-. For example, when the second battery pack 20 fails and the power circuit is cut off, at least one second unidirectional conduction branch D2 is conductive to ensure that the first battery pack 10 can still operate normally and supply power to the power module 30 .

In one embodiment, the power circuit includes a plurality of first battery cells 11 and a plurality of second battery cells 21 . A first unidirectional conductive branch D1 is provided between the negative terminal of at least two first battery cells 11 among the plurality of first battery cells 11 and the positive output terminal S+, and at least two second second battery cells among the plurality of second battery cells 21 A second unidirectional conductive branch D2 is provided between the positive terminal of the battery core 21 and the negative output terminal S-. This application does not limit the specific number of the first one-way branch D1 and the second one-way branch D2. By arranging a plurality of first battery cells 11 and a second battery core 21 and a corresponding plurality of first unidirectional conduction branches D1 and second unidirectional conduction branches D2, the stability and reliability of the power circuit can be increased. Please refer to Figure 5. Figure 5 shows a plurality of first battery cells 111, 112,... 11A, a plurality of second battery cells 211, 212,..., 21B, and a plurality of first unidirectional conductive branches D11, D12,...,D1M, multiple second one-way conduction branches D21, D22,...,D2N, where A, B, M and N are integers greater than 2.

For example, at least one first battery cell 11 in the first battery group 10 fails, at least one second battery cell 21 in the second battery group 20 fails, and at least one first unidirectional conduction branch D1 exists. There is at least one second unidirectional conduction branch D2 that is conductive, that is, the normally working first battery cell 11 in the first battery pack 10 and the normally working second battery cell 21 in the second battery pack 20 can still pass through the first battery pack 10 and the second battery pack 20 . The first conductive branch D1 and the second conductive branch D2 provide voltage to the power module 30 to ensure that the power module 30 can continue to operate normally.

In this embodiment, by setting different numbers of the first one-way conduction branches D1 and the second one-way conduction branches D2, the stability and reliability of the power conversion of the power supply circuit can be increased while the cost and cost of the power supply circuit can be reduced. weight. The power circuit can also be designed based on multiple one-way conduction branches to ensure that the power module 30 can still work stably when individual battery cells fail and the power interface circuit is cut off.

Second embodiment

On the other hand, the present application also provides a power supply circuit. FIG. 6 is a structural diagram of the power supply circuit according to the second embodiment of the present application.

Referring to FIG. 6 , in one embodiment, the power circuit includes a first battery pack 10 , a second battery pack 20 , a positive output terminal S+ and a negative output terminal S-.

Illustratively, at least one first battery cell 11 in the first battery group 10 fails, all the second battery cells 21 in the second battery group 20 work normally, and at least one first unidirectional conduction branch D1 is conductive. , that is, the second battery pack 20 can still output voltage to the output terminal of the power circuit, ensuring that the power circuit can continue to provide normal power supply.

In one embodiment, the power circuit includes a plurality of first battery cells 11 and a plurality of second battery cells 21 . A first unidirectional conductive branch D1 is provided between the negative terminal of at least two of the plurality of first battery cells 11 and the positive output terminal S+. This application does not limit the specific number of the first one-way communication branches D1. By arranging multiple first battery cells 11 and second battery cells 21 and corresponding multiple first unidirectional conduction branches D1, the stability and reliability of the power circuit can be increased. Please refer to Figure 6. Figure 6 shows a plurality of first battery cells 111, 112,... 11A, a plurality of second battery cells 211, 212,..., 21B, and a plurality of first unidirectional conductive branches D11, D12,...,D1M, where A, B and M are integers greater than 2.

Third embodiment

On the other hand, the present application also provides a power supply circuit. FIG. 7 is a structural diagram of a power supply circuit according to a third embodiment of the present application.

Referring to FIG. 7 , in one embodiment, the power circuit includes a first battery pack 10 , a second battery pack 20 , a positive output terminal S+ and a negative output terminal S-.

Illustratively, at least one second battery cell 21 in the second battery group 20 fails, all the first battery cells 11 in the first battery group 10 work normally, and at least one second unidirectional conduction branch D2 is conductive. , that is, the first battery pack 10 can still output voltage to the output terminal of the power circuit, ensuring that the power circuit can continue to provide normal power supply.

In one embodiment, the power circuit includes a plurality of first battery cells 11 and a plurality of second battery cells 21 . A second unidirectional conductive branch D2 is provided between the positive terminal of at least two of the plurality of second battery cells 21 and the negative output terminal S-. This application does not limit the specific number of the second one-way communication branches D2. By arranging multiple first battery cells 11 and second battery cells 21 and corresponding multiple second unidirectional conduction branches D2, the stability and reliability of the power circuit can be increased. Please refer to Figure 7. Figure 7 shows a plurality of first cells 111, 112,... 11A, a plurality of second cells 211, 212,..., 21B, and a plurality of second unidirectional conductive branches D21, D22,...,D2N, where A, B and N are integers greater than 2.

Fourth embodiment

On the other hand, the present application also provides a vehicle power supply system, which in one embodiment includes the power supply circuit as described in the first embodiment, the second embodiment, and the third embodiment.

Fifth embodiment

On the other hand, the present application also provides a vehicle, which in one embodiment includes the power supply circuit as described in the first embodiment, the second embodiment and the third embodiment.

It should be noted that each conduction branch in the above embodiment can be an integral control circuit. As long as it has a one-way conduction function, it falls within the protection scope of this application. In the above embodiment, each conductive branch conducts in one direction in the power supply state. Using the circuit principle provided by this application, during reverse charging, at least one conductive branch can also be used to reversely charge the battery core through the reverse conductive branch.

The embodiments of the vehicle power supply system and the vehicle provided by this application include all the technical features of the above-mentioned embodiments of the power circuit. The expansion and explanation content of the description are basically the same as those of the embodiments of the above-mentioned method, and will not be described again here.

As mentioned above, the power circuit, vehicle power system and vehicle provided by this application not only solve the problem of being unable to supply power to the power module when the power battery is abnormal by adding several components, but also solve the problem of internal imbalance of the power battery. Problem, it has the advantages of simple and reliable circuit design, low cost and light weight.

The above serial numbers of the embodiments of the present application are only for description and do not represent the advantages or disadvantages of the embodiments.

In this application, the same or similar terms, concepts, technical solutions and/or application scenario descriptions are generally only described in detail the first time they appear. When they appear again later, for the sake of simplicity, they are generally not described again. When understanding the technical solutions and other content of this application, for the same or similar term concepts, technical solutions and/or application scenario descriptions that are not described in detail later, you can refer to the relevant previous detailed descriptions.

The technical features of the technical solution of the present application can be combined in any way. In order to simplify the description, all possible combinations of the technical features in the above embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, all possible combinations can be used. It should be considered to be within the scope of description in this application.

The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the description and drawings of the present application may be directly or indirectly used in other related technical fields. , are all equally included in the patent protection scope of this application.

Claims

A power supply circuit, characterized in that the power supply circuit includes a first battery pack, a second battery pack, a positive output terminal and a negative output terminal;

The first battery pack includes a first positive terminal and a first negative terminal;

The second battery pack includes a second positive terminal and a second negative terminal;

The first negative terminal is connected to the second positive terminal, the first positive terminal is connected to the positive output terminal, and the second negative terminal is connected to the negative output terminal;

The first battery pack includes at least one first cell, and there is at least one first cell that satisfies the following requirements: a first one-way conductive branch is provided between the negative terminal of the first cell and the positive output terminal. path, the conduction direction of the first one-way conduction branch is from one end of the first one-way conduction branch connecting the first cell to the connection direction of the first one-way conduction branch One end of the positive output;

The second battery pack includes at least one second cell, and there is at least one second cell that satisfies the following requirements: a second unidirectional conductive branch is provided between the positive terminal of the second cell and the negative output terminal. path, the conduction direction of the second one-way conduction branch is from one end of the second one-way conduction branch connected to the negative output end to the end of the second one-way conduction branch connected to the second One end of the cell.
The power circuit of claim 1, wherein the first one-way conductive branch is provided between the first negative terminal and the positive output terminal.
The power circuit of claim 1 or 2, wherein the second unidirectional conductive branch is provided between the second positive terminal and the negative output terminal.
The power supply circuit according to any one of claims 1 to 3, characterized in that the power supply circuit further includes a first power supply interface terminal and a second power supply interface terminal, and the first power supply interface terminal is connected to the first positive power supply interface. terminal connection, the second interface terminal of the power supply is connected to the second negative terminal.
The power supply circuit of claim 4, wherein the power supply circuit further includes a first relay unit, and the first interface terminal of the power supply and the first positive terminal are connected through the first relay unit.
The power circuit according to claim 4 or 5, characterized in that the power circuit further includes a second relay unit, and the second interface terminal of the power supply and the second negative terminal are connected through the second relay unit. connect.
The power circuit according to any one of claims 1 to 6, characterized in that the power circuit further includes a third unidirectional conduction branch, and the first positive terminal and the positive output terminal pass through the third One-way conduction connection, the conduction direction of the third one-way conduction branch is from the first positive terminal to the positive output terminal.
The power circuit according to any one of claims 1 to 7, characterized in that the power circuit further includes a fourth unidirectional conduction branch, and the second negative terminal is connected to the negative output terminal through the third Four one-way conduction connections, the conduction direction of the fourth one-way conduction branch is from the negative output terminal to the second negative terminal.
The power circuit according to any one of claims 1 to 8, characterized in that the first unidirectional conduction branch, the second unidirectional conduction branch, the third unidirectional conduction branch, the At least one of the fourth unidirectional conduction branches includes at least one of a diode, a field effect transistor, a transistor, and a relay.
The power supply circuit according to any one of claims 1 to 9, characterized in that the power supply circuit further includes a power module, and the power module includes a positive input terminal and a negative input terminal; the positive output terminal and the The positive input terminal is connected, and the negative output terminal is connected to the negative input terminal.
The power circuit of claim 10, wherein the power module is at least one of a DC-to-DC unit, a DC-to-AC unit, or a power-consuming unit.
The power circuit according to any one of claims 1 to 11, characterized in that the first battery pack is connected to at least two of the first unidirectional conduction branches, and/or the second battery pack is connected to at least Two of the second one-way conductive branches.
A power supply circuit, characterized in that the power supply circuit includes a first battery pack, a second battery pack, a positive output terminal and a negative output terminal;

The first battery pack includes a first positive terminal and a first negative terminal;

The second battery pack includes a second positive terminal and a second negative terminal;

The first negative terminal is connected to the second positive terminal, the first positive terminal is connected to the positive output terminal, and the second negative terminal is connected to the negative output terminal;

The first battery pack includes at least one first cell, and there is at least one first cell that satisfies the following requirements: a first one-way conductive branch is provided between the negative terminal of the first cell and the positive output terminal. path, the conduction direction of the first one-way conduction branch is from one end of the first one-way conduction branch connecting the first cell to the connection direction of the first one-way conduction branch One end of the positive output.
A power supply circuit, characterized in that the power supply circuit includes a first battery pack, a second battery pack, a positive output terminal and a negative output terminal;

The first battery pack includes a first positive terminal and a first negative terminal;

The second battery pack includes a second positive terminal and a second negative terminal;

The first negative terminal is connected to the second positive terminal, the first positive terminal is connected to the positive output terminal, and the second negative terminal is connected to the negative output terminal;

The second battery pack includes at least one second cell, and there is at least one second cell that satisfies the following requirements: a second unidirectional conductive branch is provided between the positive terminal of the second cell and the negative output terminal. path, the conduction direction of the second one-way conduction branch is from one end of the second one-way conduction branch connected to the negative output end to the end of the second one-way conduction branch connected to the second One end of the cell.
A vehicle power supply system, characterized by comprising the power circuit according to any one of claims 1 to 14.
A vehicle, characterized by comprising the power circuit according to any one of claims 1 to 14.