WO2024222917A1

WO2024222917A1 - Power supply system and method of power battery pack, electronic device, and vehicle

Info

Publication number: WO2024222917A1
Application number: PCT/CN2024/090221
Authority: WO
Inventors: 凌和平; 丘国维; 闫磊; 高文; 张俊伟
Original assignee: 比亚迪股份有限公司
Priority date: 2023-04-28
Filing date: 2024-04-26
Publication date: 2024-10-31

Abstract

Provided are a power supply system (100) and power supply method of a power battery pack, an electronic device, and a vehicle. A power battery pack (10) comprises a plurality of battery modules connected in series. A first switching circuit (20) is electrically connected to the plurality of battery modules, and is used for disconnecting at least one battery module among the plurality of battery modules from the outside and connecting at least one battery module to the outside.

Description

Power battery pack power supply system, method, electronic device and vehicle

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the priority of the Chinese patent application filed with the Chinese Patent Office on April 28, 2023, with application number 202310489179.0, and entitled “Power battery pack power supply system, method, electronic device and vehicle”, and the priority of the Chinese patent application filed with the Chinese Patent Office on July 31, 2023, with application number 202322055402.9, and entitled “Power supply circuit and vehicle”, all of which are incorporated by reference in this disclosure.

Technical Field

The present disclosure relates to the field of vehicle circuit technology, and in particular, to a power battery pack power supply system, method, electronic device and vehicle.

Background Art

At present, in the high-voltage system of an electric vehicle, when part or all of the power battery pack fails, the solution is to disconnect the positive and negative contactors of the power battery pack and disconnect the system high voltage of the vehicle.

Summary of the invention

The purpose of the present disclosure is to provide a power battery pack power supply system, method, electronic device and vehicle, which can continue to supply power to the vehicle through the remaining battery modules when some battery modules of the power battery pack power supply system fail.

In order to achieve the above object, the present disclosure provides a power battery pack power supply system, the power battery pack power supply system comprising:

A power battery pack, comprising a plurality of battery modules connected in series;

The first switch circuit is electrically connected to the plurality of battery modules and is used to disconnect at least one of the plurality of battery modules from the outside and to connect at least one of the plurality of battery modules to the outside.

Optionally, the first switch circuit is electrically connected to first ends of the multiple battery modules and second ends of the multiple battery modules, and the first switch circuit is also electrically connected to a node between two adjacent battery modules among the multiple battery modules.

Optionally, the first switch circuit includes a plurality of switches, and the first end and the second end of each battery module in the plurality of battery modules are electrically connected to at least one of the switches.

Optionally, the power battery pack power supply system further includes a second switch circuit, which is electrically connected to the first switch circuit and is used to transmit the electrical signal output by the first switch circuit to an external load.

Optionally, the second switch circuit includes a plurality of switch tubes;

At least one switch tube is electrically connected between the output ends of every two adjacent switches.

Optionally, the switch tube is a diode, and for the same battery module, the switch connected to the negative electrode of the battery module is electrically connected to the anode of the diode, and the switch connected to the positive electrode of the battery module is electrically connected to the cathode of the diode.

Optionally, the first switch circuit further includes:

a first pre-charging module, the first pre-charging module being connected in parallel with a switch connected to a first end of the plurality of battery modules, or being connected in parallel with a switch connected to a second end of the plurality of battery modules, the first pre-charging module being used to pre-charge an external capacitive load; and/or

A second pre-charging module is connected in parallel with a switch connected to a node between the two adjacent battery modules, and the second pre-charging module is used to pre-charge an external capacitive load.

Optionally, the first switch circuit includes the first pre-charging module, and the first pre-charging module includes a resistor and a switch connected in series; or

The first switch circuit includes the second pre-charging module, and the second pre-charging module includes a resistor and a switch connected in series.

Optionally, the power battery pack power supply system further includes:

A voltage stabilizing module is connected to the output end of the second switch circuit and is used to stabilize the voltage output by the second switch circuit.

Optionally, the multiple battery modules include a first battery module and a second battery module, wherein the negative electrode of the first battery module is electrically connected to the positive electrode of the second battery module, and the multiple switches include a first switch, a second switch and a third switch;

The positive electrode of the first battery module is electrically connected to the input end of the first switch, the negative electrode of the first battery module is electrically connected to the input end of the second switch, and the negative electrode of the second battery module is electrically connected to the input end of the third switch.

Optionally, the plurality of switch tubes include a first switch tube and a second switch tube;

The first switch tube is electrically connected between the output end of the first switch and the output end of the second switch, and the second switch tube is electrically connected between the output end of the second switch and the output end of the third switch.

Through the above technical solution, the power battery pack includes a plurality of battery modules connected in series; the first switch circuit is electrically connected to the plurality of battery modules, and is used to disconnect at least one of the plurality of battery modules from the outside, and to connect at least one of the battery modules to the outside. In this way, when some of the plurality of battery modules connected in series fail, the failed battery modules can be isolated from the outside, and the intact battery modules can be connected to the outside, and the intact battery modules supply power to the outside, thereby ensuring that the high-voltage load continues to work, improving the battery utilization rate, and improving the safety of the electric vehicle.

The present disclosure provides a power battery pack power supply system, wherein the power battery pack comprises a first battery module and a second battery module connected in series; the power battery pack is connected to a high voltage load via a first switch circuit;

The power battery pack power supply system also includes:

The controller is used to control the opening and closing of the switch device in the first switch circuit when only one of the first battery module and the second battery module fails, so that the failed battery module is disconnected from the high-voltage load, and the high-voltage load is powered by the battery module that has not failed.

Optionally, the controller is used to:

When only one of the first battery module and the second battery module fails, the opening and closing of the switch device in the first switching circuit is controlled to disconnect the failed battery module from the high-voltage load, and the non-failed battery module supplies power to the high-voltage load with the voltage of the non-failed battery module.

Optionally, the first switch circuit includes a total positive relay, a total negative relay, a sixth switch, a seventh switch and an eighth switch, the positive electrode of the first battery module is connected to the positive electrode of the high-voltage load through the total positive relay, the negative electrode of the second battery module is connected to the negative electrode of the high-voltage load through the total negative relay, the positive electrode of the second battery module is connected to the positive electrode of the high-voltage load through the sixth switch, the negative electrode of the first battery module is connected to the negative electrode of the high-voltage load through the seventh switch, and the positive electrode of the second battery module is connected to the negative electrode of the first battery module through the eighth switch;

The controller is used to:

When the first battery module fails, controlling to disconnect the total positive relay, the seventh switch and the eighth switch, and closing the total negative relay and the sixth switch;

When the second battery module fails, the total negative relay, the sixth switch and the eighth switch are controlled to be disconnected, and the total positive relay and the seventh switch are controlled to be closed.

Optionally, the first switch circuit includes a total positive relay, a total negative relay, a ninth switch and a tenth switch, the positive electrode of the first battery module is connected to the positive electrode of the high-voltage load through the total positive relay, the negative electrode of the second battery module is connected to the negative electrode of the high-voltage load through the total negative relay, the negative electrode of the first battery module is connected to the positive electrode of the high-voltage load through the ninth switch, and the negative electrode of the first battery module is connected to the negative electrode of the high-voltage load through the tenth switch;

The controller is used to:

When the first battery module fails, controlling to disconnect the total positive relay and the tenth switch, and closing the total negative relay and the ninth switch;

When the second battery module fails, the total negative relay and the ninth switch are controlled to be disconnected, and the total positive relay and the tenth switch are controlled to be closed.

Optionally, the system further comprises:

A boost module, wherein the power battery pack is connected to the high-voltage load via the first switch circuit and the boost module in sequence;

The controller is used to:

When only one of the first battery module and the second battery module fails, the opening and closing of the switch device in the first switching circuit is controlled to disconnect the failed battery module from the high-voltage load, and the boost module is controlled to boost the voltage output by the non-failed battery module to supply power to the high-voltage load.

Optionally, the first switch circuit includes a total positive relay, a total negative relay and an eleventh switch, the positive electrode of the first battery module is connected to the positive electrode of the high-voltage load through the total positive relay, and the negative electrode of the second battery module is connected to the negative electrode of the high-voltage load through the total negative relay;

The boost module includes a capacitor, an inverter and a motor, the high-voltage load is connected in parallel with the capacitor, the power battery pack is connected to the motor through the inverter, the inverter includes an M-phase bridge arm, M≥3, the first bus end of the M-phase bridge arm is connected to the positive electrode of the high-voltage load, the second bus end of the M-phase bridge arm is connected to the negative electrode of the high-voltage load, the first end of the M-phase winding of the motor is connected to the midpoint of the M-phase bridge arm one by one, the second end of the M-phase winding is connected in common to form a neutral point, and the neutral point is connected to the negative electrode of the first battery module through the eleventh switch;

The controller is used to:

When the first battery module fails, the total positive relay is controlled to be disconnected, the total negative relay and the eleventh switch are closed, and the upper bridge arm and the lower bridge arm of the first bridge arm are controlled to be alternately turned on, so that the second battery module supplies power to the high-voltage load via the capacitor and the winding corresponding to the first bridge arm, wherein the first bridge arm is any bridge arm of the M-phase bridge arms;

When the second battery module fails, the total negative relay is controlled to be disconnected, the total positive relay and the eleventh switch are closed, and the upper bridge arm and the lower bridge arm of the first bridge arm are controlled to be alternately turned on, so that the second battery module supplies power to the high-voltage load via the capacitor and the winding corresponding to the first bridge arm.

The present disclosure provides a power supply method for a power battery pack, wherein the power battery pack is connected to a high-voltage load through a first switch circuit, and the power battery pack includes a first battery module and a second battery module connected in series, and the method includes:

When only one of the first battery module and the second battery module fails, the opening and closing of the switch device in the first switch circuit is controlled to disconnect the failed battery module from the high-voltage load, and the high-voltage load is powered by the remaining battery module.

Optionally, controlling the opening and closing of the switch device in the first switch circuit so that the failed battery module is disconnected from the high-voltage load, and the high-voltage load is powered by the intact battery module, includes:

The switch device in the first switch circuit is controlled to open and close so that the failed battery module is disconnected from the high-voltage load, and the intact battery module supplies power to the high-voltage load with the voltage of the intact battery module.

The controlling the opening and closing of the switch device in the first switch circuit includes:

Optionally, the power battery pack is connected to the high-voltage load via the first switch circuit and the boost module in sequence;

The controlling the opening and closing of the switch device in the first switch circuit so as to disconnect the failed battery module from the high-voltage load, and the non-failed battery module supplies power to the high-voltage load, comprises:

The switch device in the first switch circuit is controlled to open and close so as to disconnect the failed battery module from the high-voltage load, and the boost module is controlled to boost the voltage output by the intact battery module to supply power to the high-voltage load.

Controlling the opening and closing of the switch device in the first switch circuit to disconnect the failed battery module from the high-voltage load, and controlling the boost module to boost the voltage output by the battery module that has not failed to supply power to the high-voltage load, including:

The present disclosure also provides an electronic device, comprising a processor, wherein the processor is used to execute the above method provided by the present disclosure.

The present disclosure also provides a vehicle, comprising the power battery pack power supply system or electronic device provided by the present disclosure.

Through the above technical solution, the power battery pack includes two battery modules connected in series. When only one of them fails, the opening and closing of the switch device in the first switch circuit is controlled to disconnect the failed battery module from the high-voltage load, and only the non-failed battery module supplies power to the high-voltage load, thereby ensuring that the high-voltage load continues to work and improving the safety of the electric vehicle.

Other features and advantages of the present disclosure will be described in detail in the following detailed description.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

Fig. 1 is a schematic diagram of a power supply system of a power battery pack according to an exemplary embodiment.

FIG. 2 is a schematic diagram of a power supply system of a power battery pack according to another exemplary embodiment.

FIG. 3 is a schematic diagram of a power supply system of a power battery pack according to yet another exemplary embodiment.

FIG. 4 is a schematic diagram of a power supply system of a power battery pack according to yet another exemplary embodiment.

FIG. 5 is a schematic diagram of a power supply system of a power battery pack according to yet another exemplary embodiment.

FIG. 6 is a schematic diagram of a power supply system of a power battery pack according to yet another exemplary embodiment.

FIG. 7 is a schematic diagram of a power supply system of a power battery pack according to yet another exemplary embodiment.

Fig. 8 is a schematic diagram of a power supply system for a power battery pack including two battery modules according to yet another exemplary embodiment.

FIG. 9 is a schematic diagram of current flow in the power battery pack power supply system of FIG. 8 when the first battery module fails.

FIG. 10 is a schematic diagram of current flow in the power battery pack power supply system of FIG. 8 when the second battery module fails.

FIG. 11 is a schematic diagram showing current flow of a power battery pack power supply system including five battery modules according to an exemplary embodiment.

FIG. 12 is a schematic diagram showing current flow of a power battery pack power supply system including five battery modules according to another exemplary embodiment.

FIG. 13 is a block diagram of a power supply system for a power battery pack provided by an exemplary embodiment.

FIG. 14 is a circuit topology diagram of a power battery pack power supply system provided by an exemplary embodiment.

15 and 16 are power supply circuit diagrams of the power battery pack power supply system of FIG. 14 when a single pack fails.

FIG. 17 is a circuit topology diagram of a power battery pack power supply system provided by another exemplary embodiment.

18 and 19 are power supply circuit diagrams of the power battery pack power supply system of FIG. 17 when a single pack fails.

FIG. 20 is a block diagram of a power supply system for a power battery pack provided by another exemplary embodiment.

FIG. 21 is a circuit topology diagram of a power battery pack power supply system provided by yet another exemplary embodiment.

FIG. 22 is a power supply circuit diagram of the power battery pack power supply system of FIG. 21 when the upper half of the pack fails.

Figures 23 and 24 are timing diagrams of the power battery pack power supply system of Figure 21 when the upper half of the pack fails.

FIG. 25 is a power supply circuit diagram of the power supply system of the power battery pack of FIG. 21 when the lower half of the pack fails.

Figures 26 and 27 are timing diagrams of the power battery pack power supply system of Figure 21 when the lower half of the pack fails.

FIG. 28 is a flow chart of a method for supplying power to a power battery pack provided by an exemplary embodiment.

DETAILED DESCRIPTION

The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

At present, in the high-voltage system of electric vehicles, when a part of the battery fails, the other parts that have not failed cannot function because they are connected in series with the failed part. The solution at this time is to treat it as if all the batteries have failed. The solution is to disconnect the positive and negative contactors, disconnect the system high voltage, and all high-voltage loads and motors lose energy and cannot work. The sudden disconnection of the system high voltage during vehicle driving greatly increases the safety risks of electric vehicles.

First of all, it should be noted that the battery module in the embodiment of the present disclosure may include one or more single cells. In the case of including multiple single cells, the multiple single cells may be connected in series or in parallel, or may be a combination of series and parallel connection.

The battery module in the embodiment of the present disclosure may also include one or more battery modules. In the case where the battery module includes multiple battery modules, the multiple battery modules may be connected in series or in parallel, or may be a combination of series and parallel connection.

The battery module in the embodiment of the present disclosure may also include a single cell and a battery module, wherein the single cells and the single cells, the battery module and the battery module The cells and battery modules can be connected in series or in parallel, or in a combination of series and parallel.

Furthermore, the number of cells or battery modules included in different battery modules may be the same or different. The battery modules included in the power battery pack are connected in series. The battery modules in FIG. 2, FIG. 3, FIG. 5, FIG. 6, FIG. 11 and FIG. 12 in the embodiments of the present disclosure are only described by taking a single cell as an example.

Fig. 1 is a schematic diagram of a power battery pack power supply system according to an exemplary embodiment. As shown in Fig. 1 , the power battery pack power supply system 100 includes a power battery pack 10 and a first switch circuit 20 .

The power battery pack 10 includes a plurality of battery modules connected in series. The first switch circuit 20 is electrically connected to the plurality of battery modules and is used to disconnect at least one of the plurality of battery modules from the outside and to connect at least one of the plurality of battery modules to the outside.

The first switch circuit 20 can be connected to a plurality of predetermined nodes in the power battery pack 10. The power battery pack 10 is connected to an external load through the first switch circuit 20. In this way, through the circuit on-off relationship between the first switch circuit 20 and each battery module in the power battery pack 10, and the circuit structure inside the first switch circuit 20, it is possible to disconnect at least one battery module among the plurality of battery modules from the external load, and connect at least one battery module to the external load.

As mentioned above, in the related art, when part of the battery modules connected in series fails, the other parts that have not failed cannot function because they are connected in series with the failed parts. In this solution, when part of the multiple battery modules connected in series fails, the failed battery modules can be isolated from the outside, and the remaining battery modules can be connected to the outside, and the remaining battery modules can supply power to the outside, thereby ensuring that the high-voltage load continues to work, improving battery utilization, and improving the safety of electric vehicles.

Fig. 2 is a schematic diagram of a power battery pack power supply system according to another exemplary embodiment. As shown in Fig. 2, the first switch circuit 20 is electrically connected to the first end a of the plurality of battery modules and the second end b of the plurality of battery modules, and the first switch circuit 20 is also electrically connected to the node between two adjacent battery modules in the plurality of battery modules.

In Figure 2, the first end a of the multiple battery modules is the positive terminal of the power battery pack, and the second end b of the multiple battery modules is the negative terminal of the power battery pack. In other embodiments, the first end of the multiple battery modules may be the negative terminal of the power battery pack, and the second end of the multiple battery modules may be the positive terminal of the power battery pack.

In addition, the node between two adjacent battery modules can be any node between multiple single cells or multiple battery modules included in the power battery pack. For example, the power battery pack includes 1 to n battery modules connected in series, and the first switch circuit 20 can connect the node between the kth battery module and the k+1th battery module. That is, the 1st to kth battery modules are one battery module, and the k+1th electronic module to the nth battery module are another battery module. This example is illustrated by the electrical connection of the first switch unit to a node. In a specific implementation, the first switch circuit 20 can also be connected to multiple nodes between the 1st to nth battery modules. For example, each battery module is regarded as a battery module, and the first switch circuit is connected to the nodes between each two adjacent battery modules.

The first switch circuit 20 is connected to the first ends a of the multiple battery modules and the second ends b of the multiple battery modules, that is, the positive and negative electrodes of the power battery pack are connected. In this way, when all the battery modules in the power battery pack are valid, the positive and negative electrodes of the power battery pack can be directly connected to the load without any voltage conversion.

When any node between the single cells connected in series or between the battery modules connected in series included in the power battery pack is connected to the first switch circuit 20, the first switch circuit 20 can directly control the on-off of the external output route of the node.

The power battery pack includes each single cell connected in series, which can be used as a battery module, or each battery module connected in series can be used as a battery module, and the nodes between each two adjacent battery modules are connected to the first switch circuit 20, so that the first switch circuit 20 can finely control the on-off of more intermediate nodes in the power battery pack to output routes to the outside. Since the first switch circuit 20 can directly control the on-off of both ends of each single cell or both ends of each battery module, in the case of failure of some single cells or battery modules, it is possible to more finely extract some or all of the unfailed single cells or battery modules to continue to supply power, thereby avoiding the isolation of too many unfailed single cells or battery modules and reducing waste.

In yet another embodiment, the first switch circuit 20 may include a plurality of switches, and the first end and the second end of each battery module in the plurality of battery modules are electrically connected to at least one switch.

FIG3 is a schematic diagram of a power battery pack power supply system according to another exemplary embodiment. As shown in FIG3, a first end and a second end of each battery module in a plurality of battery modules are electrically connected to a switch. The switch can open or close the route for the node in the power battery pack connected thereto to output to the outside.

If the two switches connected to the two ends of a battery module are both turned off, the battery module can only supply power to the outside after being connected in series with the adjacent battery module, or the battery module cannot supply power to the outside. If the two switches connected to the two ends of a battery module are both turned on, the battery module can supply power to the outside alone, or together with other battery modules. If the switch connected to one end of a battery module is turned on and the switch connected to the other end is turned off, the battery module can supply power to the outside together with the battery module on the side where its switch is turned off.

In this embodiment, since the first end and the second end of each battery module in the multiple battery modules are electrically connected to a switch, the first switch circuit 20 can finely control the connection and disconnection between the two ends of each battery module and the outside through the corresponding switch. Therefore, in the event that some battery modules fail, part or all of the non-failed battery modules can be extracted more finely to continue to supply power, thereby avoiding isolating too many non-failed battery modules and reducing waste.

Fig. 4 is a schematic diagram of a power battery pack power supply system according to another exemplary embodiment. As shown in Fig. 4, the power battery pack power supply system may further include a second switch circuit 30. The second switch circuit 30 is electrically connected to the first switch circuit 20, and the second switch circuit 30 is used to transmit the electrical signal output by the first switch circuit 20 to an external load.

The second switch circuit 30 can be used to continue to control the flow direction of the electrical signal output by the first switch circuit 20. Through the structure of the second switch circuit 30 combined with the first switch circuit 20, when some battery modules in the power battery pack fail, some battery modules can be carefully selected to be isolated, so that the other battery modules can supply power to the outside together.

In another embodiment, the second switch circuit 30 may include a plurality of switch tubes, and at least one switch tube is electrically connected between the output ends of every two adjacent switches.

In the first switch circuit 20, the input end of each switch is connected to one end of the battery module. Two adjacent switches are two switches connected to the two ends of a battery module. The input ends of two adjacent switches are connected to the two ends of the same battery module, and the output ends are connected to the two ends of the same switch tube. That is, a battery module is connected in parallel with a switch tube in the second switch circuit 30 through two switches in the first switch circuit 20 connected to the positive and negative electrodes of the battery module.

The switch tube may include a diode, a triode, an insulated gate bipolar transistor (IGBT), etc. The switch tube may have a fixed current flow direction, and the switch tube is connected in parallel with the corresponding battery module (through a switch), so the current in the switch tube may be inconsistent with the current flow direction in the corresponding battery module. In this way, on the one hand, when the switches at both ends of the battery module are turned on, the battery module and the corresponding switch tube will not form a loop, and the switch tube will not short-circuit the corresponding battery module. On the other hand, when a battery module fails, the switches connected at both ends of it can be turned on so that the two adjacent battery modules (if they are not failed) can be reconnected in series through the switch tube corresponding to the battery module to supply power to the outside.

In the second switch circuit 30, the switch tube is further set to form a circuit topology in combination with the first switch circuit 20, so as to control the isolation of the failed battery module and enable the battery module that has not failed to continue to supply power to the outside.

Fig. 5 is a schematic diagram of a power battery pack power supply system according to another exemplary embodiment. As shown in Fig. 5, the switch tube is a diode, and for the same battery module, the switch connected to the negative electrode of the battery module is electrically connected to the anode of the diode, and the switch connected to the positive electrode of the battery module is electrically connected to the cathode of the diode.

As mentioned above, the current in the switch tube may not flow in the same direction as the current in the corresponding battery module. When the switch tube is a diode, if the switches at both ends of a battery module are turned on, in the structure where the diode and the battery module are connected in parallel, the diode allows the internal current to flow from the anode to the cathode, while the current at the diode cannot flow from the anode to the cathode when the corresponding battery module is discharged. Therefore, even if the switches at both ends of a battery module are turned on, the corresponding diode will not short-circuit the battery module.

From another perspective, the switch connected to the negative electrode of the battery module is electrically connected to the anode of the diode, and the switch connected to the positive electrode of the battery module is electrically connected to the cathode of the diode. If the switches at both ends of the battery module are turned on, the cathode voltage of the diode is greater than the anode voltage, and there will be no current in the diode. If the battery module is invalid, if the switches at both ends of the battery module are turned on, the current from the negative electrode of the battery module can flow to the positive electrode through the diode, connecting the battery modules (or nodes) on both sides of the failed battery module in series, and isolating the battery module at the same time. See the embodiments in Figures 11 and 12 for details.

In this embodiment, by setting a simple diode, the failed battery module can be reliably isolated, and the non-failed battery modules can be connected in series to supply power externally, and the circuit is simple.

In yet another embodiment, the first switch circuit 20 may further include a first pre-charging module and/or a second pre-charging module.

The first pre-charging module is connected in parallel with a switch connected to a first terminal a of a plurality of battery modules, or connected in parallel with a switch connected to a second terminal b of a plurality of battery modules. The first pre-charging module 21 is used to pre-charge an external capacitive load.

The second pre-charging module 22 is connected in parallel with a switch connected to a node between two adjacent battery modules, and the second pre-charging module 22 is used to pre-charge an external capacitive load.

The first pre-charging module includes a pre-charging module arranged at the positive electrode of the power battery pack, or a pre-charging module at the negative electrode of the power battery pack. The second pre-charging module may include one or more pre-charging modules. The switches connected to the nodes between every two adjacent battery modules are connected in parallel with the second pre-charging module, or the switches connected to a part of the nodes between adjacent battery modules are connected in parallel with the second pre-charging module.

Fig. 6 is a schematic diagram of a power battery pack power supply system according to another exemplary embodiment. As shown in Fig. 6, the first pre-charging module 21 is connected in parallel with the switch connected to the first terminal a of the plurality of battery modules, and the switch connected to the node between each two adjacent battery modules is connected in parallel with the second pre-charging module 22.

When the failed battery module is isolated and the new power supply battery module combination formed by connecting the non-failed battery modules in series supplies power to the outside, if the new power supply battery module combination as a whole has one end (positive or negative) connected to an external load through a switch in the first switch circuit 20, the first pre-charging module or the second pre-charging module connected in parallel with the switch can be used to pre-charge the external capacitive load. See Figure 9 for details.

In this embodiment, by providing a pre-charging module connected in parallel with the switch in the first switch circuit 20, the external capacitive load can still be pre-charged when the battery module is reassembled to supply power externally. The provision of the pre-charging module can prevent damage to electronic devices due to excessive current at the moment of power-on, thereby ensuring the safety and stability of power supply.

In one embodiment, the first switch circuit 20 includes a first pre-charging module 21, which includes a resistor and a switch connected in series. In another embodiment, the first switch circuit 20 includes a second pre-charging module 22, which includes a resistor and a switch connected in series.

That is, the resistor and the switch are connected in series as the first pre-charging module or the second pre-charging module, and connected in parallel with the corresponding switch. The circuit structure is simple and has high reliability.

Fig. 7 is a schematic diagram of a power battery pack power supply system according to another exemplary embodiment. As shown in Fig. 7 , the power battery pack power supply system 100 may further include a voltage stabilizing module 8 .

The voltage stabilizing module 8 is connected to the output end of the second switch circuit 30 and is used for stabilizing the voltage output by the second switch circuit 30 .

The voltage stabilizing module 8 can be configured by using the structure in the related art. For example, the voltage stabilizing module 8 can be a capacitor connected in parallel between the positive output terminal and the negative output terminal of the second switch circuit 30 .

After some battery modules fail, when the method in this solution is used to continue to supply power, the voltage may change greatly. In this embodiment, by setting a voltage stabilizing module, the voltage in the power supply system of the power battery pack can be stabilized to eliminate voltage fluctuations and noise.

Fig. 8 is a schematic diagram of a power battery pack power supply system including two battery modules according to another exemplary embodiment. As shown in Fig. 8, the plurality of battery modules include a first battery module 1 and a second battery module 2, wherein the negative electrode of the first battery module 1 is electrically connected to the positive electrode of the second battery module 2, and the plurality of switches include a first switch 3, a second switch 4 and a third switch 5.

The positive electrode of the first battery module 1 is electrically connected to the input end of the first switch 3 , the negative electrode of the first battery module 1 is electrically connected to the input end of the second switch 4 , and the negative electrode of the second battery module 2 is electrically connected to the input end of the third switch 5 .

In FIG8 , the plurality of switch tubes include a first switch tube 6 and a second switch tube 7. The first switch tube 6 is electrically connected between the output end of the first switch 3 and the output end of the second switch 4, and the second switch tube 7 is electrically connected between the output end of the second switch 4 and the output end of the third switch 5. The first switch tube 6 and the second switch tube 7 are diodes.

The power battery pack power supply system 100 can be applied to a vehicle, and the first battery module 1 and the second battery module 2 connected in series in the power battery pack power supply system 100 can supply power to a motor, a high-voltage load, etc. The high-voltage load may include, for example, an on-board charger (OBC), a compressor, a positive temperature coefficient (PTC) heater, etc.

In FIG8 , the first switch circuit 20 further includes a first pre-charging module connected in parallel with the first switch 3 , the first pre-charging module including a first resistor 9 and a fourth switch 11 connected in series, for pre-charging when the first battery module 1 is not failed.

One end of the first resistor 9 is connected to the output end of the first switch 3, the other end of the first resistor 9 is connected to one end of the fourth switch 11, and the other end of the fourth switch 11 is connected to the input end of the first switch 3. In the case where the first battery module 1 is not failed and the second battery module 2 is failed, if the power battery pack power supply system 100 supplies power to the high-voltage load, the fourth switch 11 can be turned on for pre-charging, and after the pre-charging is completed, the fourth switch 11 can be turned off and the first switch 3 can be turned on.

In Figure 8, the first switching circuit 20 also includes a second pre-charging module connected in parallel with the second switch 4, and the second pre-charging module includes a second resistor 13 and a fifth switch 12 connected in series, which is used for pre-charging when the first battery module 1 fails and the second battery module 2 does not fail.

One end of the second resistor 13 is connected to the output end of the second switch 4, the other end of the second resistor 13 is connected to one end of the fifth switch 12, and the other end of the fifth switch 12 is connected to the input end of the second switch 4. In the case where the second battery module 2 is not failed and the first battery module 1 is failed, if the power battery pack power supply system 100 supplies power to the high-voltage load, the fifth switch 12 can be turned on for pre-charging, and after the pre-charging is completed, the fifth switch 12 can be turned off and the second switch 4 can be turned on.

FIG9 is a schematic diagram of the current flow direction of the power battery pack power supply system of FIG8 when the first battery module fails. When the first battery module 1 fails and the second battery module 2 does not fail, the second switch 4 is turned on, the first switch 3 is turned off, and the third switch 5 is turned on. The direction of the current is from the positive electrode of the second battery module 2 through the second switch 4, the first switch tube 6, the high-voltage load, the third switch 5 to the negative electrode of the second battery module 2. In FIG8, FIG9 and FIG10, a motor controller with a three-phase bridge arm is connected in parallel with the voltage stabilizing module 8, and the power battery pack power supply system 100 can be used to power a three-phase motor. In FIG9 and FIG10, the direction of the arrow is the direction of the current.

FIG10 is a schematic diagram of the current flow direction of the power battery pack power supply system of FIG8 when the second battery module fails. When the second battery module 2 fails and the first battery module 1 does not fail, the second switch 4 is turned on, the third switch 5 is turned off, and the first switch 3 is turned on. The current direction is from the positive electrode of the first battery module 1 through the first switch 3, the high-voltage load, the second switch tube 7, the second switch 4 to the negative electrode of the first battery module 1.

In this solution, when the first battery module 1 fails and the second battery module 2 does not fail, the switch in the first switching circuit 20 can be controlled so that the second battery module 2 that has not failed continues to supply power to the load; when the first battery module 1 does not fail and the second battery module 2 fails, the switch in the first switching circuit 20 can be controlled so that the first battery module 1 that has not failed continues to supply power to the load.

If the first battery module 1 and the second battery module 2 have the same voltage, the battery module that has not failed can provide half the voltage of the entire battery module to supply the load. The method in the related art can be applied to determine whether the battery module is failed, and this solution has no method improvement.

In this embodiment, the power battery pack includes two battery modules connected in series. When only one of them fails, the failed battery module can be isolated and only the remaining battery module is used for power supply, thereby ensuring that the high-voltage load continues to work, improving battery utilization, and improving the safety of the electric vehicle.

FIG11 is a schematic diagram of the current flow of a power battery pack power supply system including five battery modules according to an exemplary embodiment. As shown in FIG11 , the power battery pack includes five battery modules connected in series. Among them, the 2nd and 4th battery modules fail, and the 1st, 3rd and 5th battery modules do not fail. Then, all the switches in the first switch circuit 20 can be turned on by controlling, and a current as shown by the arrow in FIG11 can be formed through the first switch circuit 20 and the second switch circuit 30, and the 2nd and 4th battery modules are isolated, and the 1st, 3rd and 5th battery modules are connected in series to form a new power supply battery module combination to supply power to the outside.

FIG12 is a schematic diagram of the current flow of a power battery pack power supply system including five battery modules according to another exemplary embodiment. As shown in FIG12, the power battery pack includes five battery modules connected in series. Among them, the 2nd and 3rd battery modules fail, and the 1st, 4th and 5th battery modules do not fail. Then, by controlling the on and off of the switch in the first switch circuit 20, a current as shown by the arrow in FIG12 can be formed through the first switch circuit 20 and the second switch circuit 30, the 2nd and 3rd battery modules are isolated, and the 1st, 4th and 5th battery modules are connected in series to form a new power supply battery module combination to supply power to the outside.

FIG13 is a block diagram of a power battery pack power supply system provided by an exemplary embodiment. As shown in FIG13 , the power battery pack power supply system 100 may include a power battery pack 10 , a first switch circuit 20 , and a controller 50 .

The power battery pack 10 includes a first battery module 1 and a second battery module 2 connected in series. The power battery pack 10 is connected to a high voltage load 40 via a first switch circuit 20 .

The controller 50 is used to: when only one of the first battery module 1 and the second battery module 2 fails, control the opening and closing of the switch device in the first switch circuit 20 to disconnect the failed battery module from the high-voltage load 40, and the high-voltage load 40 is powered by the remaining battery module.

The power battery pack 10 can be used in a vehicle to supply power to a high voltage load 40, a motor, etc. The power battery pack 10 includes a first battery module 1 and a second battery module 2 connected in series, that is, the power battery pack 10 can include two half packs connected in series, namely, the first battery module 1 and the second battery module 2.

In the related art, the positive and negative electrodes of the power battery pack are connected to the two ends of the high-voltage load through the total positive relay and the total negative relay respectively. When one half pack fails, the other half pack that has not failed cannot function because it is connected in series with the failed half pack, which is equivalent to the complete failure of the battery. The high-voltage load 40 may include, for example, an on-board charger (OBC), a compressor, a positive temperature coefficient (PTC) heater, etc.

In this solution, the power battery pack 10 is connected to the high-voltage load 40 through the first switch circuit 20. The first switch circuit 20 may include a plurality of switch devices, and the on and off of these switch devices are controlled to isolate the failed battery module from the high-voltage load, and only the battery module that has not failed supplies power to the high-voltage load. Among them, the method in the relevant technology can be applied to determine whether the battery module is failed, which will not be repeated here.

Through the above technical solution, the power battery pack includes two battery modules connected in series. When only one of them fails, the opening and closing of the switch device in the first switch circuit is controlled to disconnect the failed battery module from the high-voltage load, and only the non-failed battery module supplies power to the high-voltage load, thereby ensuring that the high-voltage load continues to work, improving the safety of the electric vehicle, and achieving safety redundancy.

In another embodiment, the controller 50 is used to: when only one of the first battery module 1 and the second battery module 2 fails, control the opening and closing of the switching device in the first switching circuit 20 to disconnect the failed battery module from the high-voltage load 40, and the non-failed battery module supplies power to the high-voltage load 40 with the voltage of the non-failed battery module.

The first battery module 1 and the second battery module 2 may have the same voltage or different voltages. The failed battery module may be isolated from the high-voltage load by controlling some of the switching devices in the first switch circuit 20, and the non-failed battery module supplies power to the high-voltage load 40 with its own voltage. For example, by controlling the first switch circuit 20, the positive and negative electrodes of the non-failed battery module are directly connected to the positive and negative electrodes of the high-voltage load 40 for power supply. If the first battery module 1 and the second battery module 2 have the same voltage, the non-failed battery module can supply the high-voltage load with half the voltage of the power battery pack 10.

In this embodiment, the voltage of the intact battery module is directly controlled to supply power to the high-voltage load without the need for voltage boosting, which can maintain the basic functions of the high-voltage load and has simple circuits, simple control strategies, fast processing speed and high reliability.

FIG14 is a circuit topology diagram of a power battery pack power supply system provided by an exemplary embodiment. As shown in FIG14, the first switch circuit 20 includes a total positive relay K+, a total negative relay K-, a sixth switch 14, a seventh switch 15, and an eighth switch 16. The positive electrode of the first battery module 1 is connected to the positive electrode of the high-voltage load 40 through the total positive relay K+, and the negative electrode of the second battery module 2 is connected to the negative electrode of the high-voltage load 40 through the total negative relay K-. The positive electrode of the second battery module 2 is connected to the positive electrode of the high-voltage load 40 through the sixth switch 14, the negative electrode of the first battery module 1 is connected to the negative electrode of the high-voltage load 40 through the seventh switch 15, and the positive electrode of the second battery module 2 is connected to the negative electrode of the first battery module 1 through the eighth switch 16.

In the circuit of FIG14 , a high voltage load 40 is connected in parallel with a capacitor C1 , and the circuit also includes an inverter 51 and a motor 52 . The power battery pack 10 is also used to supply power to the motor 52 through the inverter 51 .

FIG15 is a power supply circuit diagram when the first battery module 1 fails. The controller 50 is used to control the disconnection of the total positive relay K+, the seventh switch 15 and the eighth switch 16, and the closing of the total negative relay K- and the sixth switch 14 when the first battery module 1 fails. In FIG15 and other figures mentioned below, the direction of the arrow is the direction of the current.

16 is a power supply circuit diagram when the second battery module 2 fails. The controller 50 is used to control the disconnection of the total negative relay K-, the sixth switch 14 and the eighth switch 16, and the closing of the total positive relay K+ and the seventh switch 15 when the second battery module 2 fails.

FIG17 is a circuit topology diagram of a power battery pack power supply system provided by another exemplary embodiment. As shown in FIG17 , the first switch circuit 20 includes a total positive relay K+, a total negative relay K-, a ninth switch 17, and a tenth switch 18. The positive electrode of the first battery module 1 is connected to the positive electrode of the high-voltage load 40 through the total positive relay K+, and the negative electrode of the second battery module 2 is connected to the negative electrode of the high-voltage load 40 through the total negative relay K-. The negative electrode of the first battery module 1 is connected to the positive electrode of the high-voltage load 40 through the ninth switch 17, and the negative electrode of the first battery module 1 is connected to the negative electrode of the high-voltage load 40 through the tenth switch 18.

18 is a power supply circuit diagram when the first battery module 1 fails. The controller 50 is used to control the disconnection of the total positive relay K+ and the tenth switch 18 and the closing of the total negative relay K− and the ninth switch 17 when the first battery module 1 fails.

19 is a power supply circuit diagram when the second battery module 2 fails. The controller 50 is used to control the disconnection of the total negative relay K- and the ninth switch 17 and the closing of the total positive relay K+ and the tenth switch 18 when the second battery module 2 fails.

FIG20 is a block diagram of a power battery pack power supply system provided by another exemplary embodiment. As shown in FIG20 , based on FIG1 , the power battery pack power supply system 100 further includes a boost module 60. The power battery pack 10 is connected to the high voltage load 40 through the first switch circuit 20 and the boost module 60 in sequence. The controller 50 is connected to the boost module 60.

The controller 50 is used to: when only one of the first battery module 1 and the second battery module 2 fails, control the opening and closing of the switching device in the first switching circuit 20 to disconnect the failed battery module from the high-voltage load 40, and control the boost module 60 to boost the voltage output by the non-failed battery module to supply power to the high-voltage load 40.

In this embodiment, the controller 50 controls the opening and closing of the switch device in the first switch circuit 20 to isolate the failed battery module and retain the battery module that has not failed. On the other hand, it controls the boost module 60 to boost the voltage output by the battery module that has not failed and supply it to the high-voltage load. In this embodiment, the voltage output by the battery module that has not failed is boosted, which reduces the impact of the invalid single-pack battery on the operation of the high-voltage load.

FIG21 is a circuit topology diagram of a power battery pack power supply system provided by another exemplary embodiment. As shown in FIG21 , the first switch circuit 20 includes a total positive relay K+, a total negative relay K- and an eleventh switch K6, the positive electrode of the first battery module 1 is connected to the positive electrode of the high-voltage load 40 through the total positive relay K+, and the negative electrode of the second battery module 2 is connected to the negative electrode of the high-voltage load 40 through the total negative relay K-.

The boost module 60 includes a capacitor C1, an inverter 51 and a motor 52. The high-voltage load 40 is connected in parallel with the capacitor C1, and the power battery pack 10 is connected to the motor 52 through the inverter 51. The inverter 51 includes an M-phase bridge arm, M≥3 (in Figure 21, M＝3). The first bus terminal of the M-phase bridge arm is connected to the positive pole of the high-voltage load 40, and the second bus terminal of the M-phase bridge arm is connected to the negative pole of the high-voltage load 40. The first end of the M-phase winding of the motor 52 is connected to the midpoint of the M-phase bridge arm one by one, and the second end of the M-phase winding is connected in common to form a neutral point, and the neutral point is connected to the negative pole of the first battery module 1 through the eleventh switch K6.

The controller 50 is used to: when the first battery module 1 fails, control the disconnection of the total positive relay K+, close the total negative relay K- and the eleventh switch K6, and control the upper bridge arm and the lower bridge arm of the first bridge arm to be alternately turned on, so that the second battery module 2 supplies power to the high-voltage load 40 via the capacitor C1 and the winding corresponding to the first bridge arm, wherein the first bridge arm is any bridge arm in the M-phase bridge arm;

When the second battery module 2 fails, the total negative relay K- is controlled to be disconnected, the total positive relay K+ and the eleventh switch K6 are closed, and the upper bridge arm and the lower bridge arm of the first bridge arm are controlled to be alternately turned on, so that the second battery module 2 supplies power to the high-voltage load 40 via the capacitor C1 and the winding corresponding to the first bridge arm.

Fig. 22 is a power supply circuit diagram of the power battery pack power supply system of Fig. 21 when the upper half pack (first battery module 1) fails. If the first battery module 1 fails, the controller 50 may alternately cycle the control in the first sequence and the control in the second sequence.

Figures 23 and 24 are timing diagrams of the power battery pack power supply system of Figure 21 when the upper half pack fails. In Figure 23, the inverter 51 includes three-phase six half-bridge arms V1-V6, and the motor 52 includes three-phase windings A, B, and C. In the first timing shown in Figure 23, the upper bridge arm of the first bridge arm is controlled to be turned on (bridge arm V1 is turned on in Figure 23), and the lower bridge arm of the first bridge arm is turned off (bridge arm V4 is turned off in Figure 23), so that the second battery module 2 and the winding A corresponding to the first bridge arm are powered to the capacitor C1 and the high-voltage load 40; in the second timing shown in Figure 24, the upper bridge arm of the first bridge arm is controlled to be turned off (bridge arm V1 is turned off in Figure 24), and the lower bridge arm of the first bridge arm is turned on (bridge arm V4 is turned on in Figure 24), so that the second battery module 2 is charged to the winding A corresponding to the first bridge arm, and the capacitor C1 is powered to the high-voltage load 40.

FIG25 is a power supply circuit diagram of the power battery pack power supply system of FIG21 when the lower half pack (second battery module 2) fails. The controller 50 may alternately cycle the control in the first sequence and the control in the second sequence.

Figures 26 and 27 are timing diagrams of the power battery pack power supply system of Figure 21 when the lower half pack fails. In the first timing shown in Figure 26, the upper bridge arm of the first bridge arm is controlled to be turned off (bridge arm V1 is turned off in Figure 26), and the lower bridge arm of the first bridge arm is turned on (bridge arm V4 is turned on in Figure 26), so that the first battery module 1 and the winding A corresponding to the first bridge arm supply power to the capacitor C1 and the high-voltage load 40; in the second timing shown in Figure 27, the upper bridge arm of the first bridge arm is controlled to be turned on (bridge arm V4 is turned off in Figure 27), and the lower bridge arm of the first bridge arm is turned off (bridge arm V1 is turned on in Figure 27), so that the first battery module 1 charges the winding A corresponding to the first bridge arm, and the capacitor C1 supplies power to the high-voltage load 40.

In this embodiment, the original capacitors, inverters and motors in the vehicle are reused as devices in the boost module, and no new devices for boosting are added, which reduces the space occupied in the vehicle. In addition, the topology of the boost module uses the thyristor in the motor controller (inverter), which enhances the degree of system integration. When the vehicle is driven by multiple motors, this embodiment can ensure that one motor is used for boosting and the other motors work normally, reducing the risk of the vehicle breaking down.

By setting the proportion of the duration in the two time sequences, the voltage of the battery module that has not failed can be boosted to the voltage of the original power battery pack 10 before failure. In this way, when a battery module fails, the voltage provided to the high-voltage load will not be reduced, thereby achieving normal high-voltage power supply using only a part of the entire power battery pack, thereby achieving the purpose of ensuring that the high-voltage load continues to work.

Based on the same inventive concept, the present disclosure also provides a power battery pack power supply method. The power battery pack 10 is connected to the high-voltage load 40 through the first switch circuit 20, and the power battery pack 10 includes a first battery module 1 and a second battery module 2 connected in series. FIG. 28 is a flow chart of a power battery pack power supply method provided by an exemplary embodiment. As shown in FIG. 28, the method may include step S101.

In step S101, when only one of the first battery module 1 and the second battery module 2 fails, the opening and closing of the switch device in the first switch circuit 20 is controlled to disconnect the failed battery module from the high-voltage load 40, and the high-voltage load 40 is powered by the remaining battery module.

Optionally, controlling the opening and closing of the switch device in the first switch circuit 20 so that the failed battery module is disconnected from the high-voltage load 40, and the high-voltage load 40 is powered by the battery module that is not failed, includes:

The switch devices in the first switch circuit 20 are controlled to be opened and closed so that the failed battery module is disconnected from the high-voltage load 40, and the remaining battery modules supply power to the high-voltage load 40 at the voltage of the remaining battery modules.

Optionally, the first switching circuit 20 includes a total positive relay K+, a total negative relay K-, a sixth switch 14, a seventh switch 15 and an eighth switch 16, the positive electrode of the first battery module 1 is connected to the positive electrode of the high-voltage load 40 through the total positive relay K+, the negative electrode of the second battery module 2 is connected to the negative electrode of the high-voltage load 40 through the total negative relay K-, the positive electrode of the second battery module 2 is connected to the positive electrode of the high-voltage load 40 through the sixth switch 14, the negative electrode of the first battery module 1 is connected to the negative electrode of the high-voltage load 40 through the seventh switch 15, and the positive electrode of the second battery module 2 is connected to the negative electrode of the first battery module 1 through the eighth switch 16.

Controlling the opening and closing of the switch device in the first switch circuit 20 includes:

When the first battery module 1 fails, the total positive relay K+, the seventh switch 15 and the eighth switch 16 are controlled to be disconnected, and the total negative relay K- and the sixth switch 14 are closed;

When the second battery module 2 fails, the control is to disconnect the total negative relay K−, the sixth switch 14 and the eighth switch 16 , and to close the total positive relay K+ and the seventh switch 15 .

Optionally, the first switching circuit 20 includes a total positive relay K+, a total negative relay K-, a ninth switch 17 and a tenth switch 18, the positive electrode of the first battery module 1 is connected to the positive electrode of the high-voltage load 40 through the total positive relay K+, the negative electrode of the second battery module 2 is connected to the negative electrode of the high-voltage load 40 through the total negative relay K-, the negative electrode of the first battery module 1 is connected to the positive electrode of the high-voltage load 40 through the ninth switch 17, and the negative electrode of the first battery module 1 is connected to the negative electrode of the high-voltage load 40 through the tenth switch 18.

When the first battery module 1 fails, the control disconnects the total positive relay K+ and the tenth switch 18, and closes the total negative relay K- and the ninth switch 17;

When the second battery module 2 fails, the control disconnects the total negative relay K− and the ninth switch 17 , and closes the total positive relay K+ and the tenth switch 18 .

Optionally, the power battery pack 10 is connected to the high-voltage load 40 via the first switch circuit 20 and the boost module 60 in sequence.

Controlling the opening and closing of the switch device in the first switch circuit 20 to disconnect the failed battery module from the high-voltage load 40, and the high-voltage load 40 is powered by the battery module that is not failed, including:

The switch components in the first switch circuit 20 are controlled to be turned on and off to disconnect the failed battery module from the high-voltage load 40 , and the boost module 60 is controlled to boost the voltage output by the non-failed battery module to supply power to the high-voltage load 40 .

Optionally, the first switching circuit 20 includes a total positive relay K+, a total negative relay K- and an eleventh switch K6, the positive electrode of the first battery module 1 is connected to the positive electrode of the high-voltage load 40 through the total positive relay K+, and the negative electrode of the second battery module 2 is connected to the negative electrode of the high-voltage load 40 through the total negative relay K-.

The boost module 60 includes a capacitor C1, an inverter 51 and a motor 52. The high-voltage load 40 is connected in parallel with the capacitor C1. The power battery pack 10 is connected to the motor 52 through the inverter 51. The inverter 51 includes an M-phase bridge arm, M≥3. The first bus terminal of the M-phase bridge arm is connected to the positive electrode of the high-voltage load 40, and the second bus terminal of the M-phase bridge arm is connected to the negative electrode of the high-voltage load 40. The first end of the M-phase winding of the motor 52 is connected to the midpoint of the M-phase bridge arm one by one, and the second end of the M-phase winding is connected to the midpoint of the M-phase bridge arm one by one. The neutral point is connected to the negative electrode of the first battery module 1 through the eleventh switch K6.

Controlling the opening and closing of the switch device in the first switch circuit 20 to disconnect the failed battery module from the high-voltage load 40, and controlling the boost module 60 to boost the voltage output by the battery module that is not failed to supply power to the high-voltage load 40, including:

When the first battery module 1 fails, the total positive relay K+ is controlled to be disconnected, the total negative relay K- and the eleventh switch K6 are closed, and the upper bridge arm and the lower bridge arm of the first bridge arm are controlled to be alternately turned on, so that the second battery module 2 supplies power to the high-voltage load 40 via the capacitor C1 and the winding corresponding to the first bridge arm, wherein the first bridge arm is any bridge arm in the M-phase bridge arm;

The present disclosure also provides a vehicle, comprising the above-mentioned power battery pack power supply system or electronic device provided by the present disclosure.

Regarding the method in the above embodiment, the specific manner of executing the operation in each step has been described in detail in the embodiment of the system, and will not be elaborated here.

The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

A power battery pack power supply system (100), characterized in that the power battery pack power supply system (100) comprises:

A power battery pack (10), comprising a plurality of battery modules connected in series;

The first switch circuit (20) is electrically connected to the plurality of battery modules and is used to disconnect at least one of the plurality of battery modules from the outside and to connect at least one of the plurality of battery modules to the outside.
The power battery pack power supply system (100) according to claim 1 is characterized in that the first switch circuit (20) is electrically connected to the first end (a) of the multiple battery modules and the second end (b) of the multiple battery modules, and the first switch circuit (20) is also electrically connected to a node between two adjacent battery modules among the multiple battery modules.
The power battery pack power supply system (100) according to claim 1 or 2 is characterized in that the first switch circuit (20) comprises a plurality of switches, and the first end and the second end of each battery module in the plurality of battery modules are electrically connected to at least one of the switches.
The power battery pack power supply system (100) according to claim 3 is characterized in that the power battery pack power supply system also includes a second switch circuit (30), and the second switch circuit (30) is electrically connected to the first switch circuit (20) and is used to transmit the electrical signal output by the first switch circuit (20) to an external load.
The power battery pack power supply system (100) according to claim 4, characterized in that the second switch circuit (30) comprises a plurality of switch tubes;

At least one switch tube is electrically connected between the output ends of every two adjacent switches.
The power battery pack power supply system (100) according to claim 5 is characterized in that the switch tube is a diode, and for the same battery module, the switch connected to the negative electrode of the battery module is electrically connected to the anode of the diode, and the switch connected to the positive electrode of the battery module is electrically connected to the cathode of the diode.
The power battery pack power supply system (100) according to any one of claims 3 to 6, characterized in that the first switch circuit (20) further comprises:

a first pre-charging module (21), the first pre-charging module (21) being connected in parallel with a switch connected to a first end (a) of the plurality of battery modules, or being connected in parallel with a switch connected to a second end (b) of the plurality of battery modules, the first pre-charging module (21) being used to pre-charge an external capacitive load; and/or

A second pre-charging module (22), the second pre-charging module (22) is connected in parallel with a switch connected to a node between the two adjacent battery modules, and the second pre-charging module (22) is used to pre-charge an external capacitive load.
The power battery pack power supply system (100) according to claim 7, characterized in that the first switch circuit (20) comprises the first pre-charging module (21), and the first pre-charging module (21) comprises a resistor and a switch connected in series; or

The first switch circuit (20) comprises the second pre-charging module (22), and the second pre-charging module (22) comprises a resistor and a switch connected in series.
The power battery pack power supply system (100) according to any one of claims 4 to 8, characterized in that the power battery pack power supply system (100) further comprises:

A voltage stabilizing module (8) is connected to the output end of the second switch circuit (30) and is used to stabilize the voltage output by the second switch circuit (30).
The power battery pack power supply system (100) according to any one of claims 1 to 9, characterized in that the multiple battery modules include a first battery module (1) and a second battery module (2), wherein the negative electrode of the first battery module (1) is electrically connected to the positive electrode of the second battery module (2), and the multiple switches include a first switch (3), a second switch (4) and a third switch (5);

The positive electrode of the first battery module (1) is electrically connected to the input end of the first switch (3), the negative electrode of the first battery module (1) is electrically connected to the input end of the second switch (4), and the negative electrode of the second battery module (2) is electrically connected to the input end of the third switch (5).
The power battery pack power supply system (100) according to claim 10, characterized in that the plurality of switch tubes include a first switch tube (6) and a second switch tube (7);

A first switch tube (6) is electrically connected between the output end of the first switch (3) and the output end of the second switch (4), and a second switch tube (7) is electrically connected between the output end of the second switch (4) and the output end of the third switch (5).
The power battery pack power supply system (100) according to any one of claims 1 to 11, characterized in that the power battery pack (10) comprises a first battery module (1) and a second battery module (2) connected in series; the power battery pack (10) is connected to a high-voltage load (40) via the first switch circuit (20);

The power battery pack power supply system (100) further includes:

A controller (50) is used to control the opening and closing of a switch device in the first switch circuit (20) when only one of the first battery module (1) and the second battery module (2) fails, so that the failed battery module is disconnected from the high-voltage load (40), and the high-voltage load (40) is powered by the remaining battery module.
The power battery pack power supply system (100) according to claim 12, characterized in that the controller (50) is used to:

When only one of the first battery module (1) and the second battery module (2) fails, the opening and closing of the switch device in the first switch circuit (20) is controlled so that the failed battery module is disconnected from the high-voltage load (40), and the non-failed battery module supplies power to the high-voltage load (40) at the voltage of the non-failed battery module.
The power battery pack power supply system (100) according to claim 13 is characterized in that the first switch circuit (20) comprises a total positive relay (K+), a total negative relay (K-), a sixth switch (14), a seventh switch (15) and an eighth switch (16), the positive electrode of the first battery module (1) is connected to the positive electrode of the high-voltage load (40) through the total positive relay (K+), the negative electrode of the second battery module (2) is connected to the negative electrode of the high-voltage load (40) through the total negative relay (K-), the positive electrode of the second battery module (2) is connected to the positive electrode of the high-voltage load (40) through the sixth switch (14), the negative electrode of the first battery module (1) is connected to the negative electrode of the high-voltage load (40) through the seventh switch (15), and the positive electrode of the second battery module (2) is connected to the negative electrode of the first battery module (1) through the eighth switch (16);

The controller (50) is used to:

When the first battery module (1) fails, controlling to disconnect the total positive relay (K+), the seventh switch (15) and the eighth switch (16), and closing the total negative relay (K-) and the sixth switch (14);

When the second battery module (2) fails, the total negative relay (K-), the sixth switch (14) and the eighth switch (16) are controlled to be disconnected, and the total positive relay (K+) and the seventh switch (15) are closed.
The power battery pack power supply system (100) according to claim 13 is characterized in that the first switch circuit (20) comprises a total positive relay (K+), a total negative relay (K-), a ninth switch (17) and a tenth switch (18), the positive electrode of the first battery module (1) is connected to the positive electrode of the high-voltage load (40) through the total positive relay (K+), the negative electrode of the second battery module (2) is connected to the negative electrode of the high-voltage load (40) through the total negative relay (K-), the negative electrode of the first battery module (1) is connected to the positive electrode of the high-voltage load (40) through the ninth switch (17), and the negative electrode of the first battery module (1) is connected to the negative electrode of the high-voltage load (40) through the tenth switch (18);

The controller (50) is used to:

When the first battery module (1) fails, controlling to disconnect the total positive relay (K+) and the tenth switch (18), and closing the total negative relay (K-) and the ninth switch (17);

When the second battery module (2) fails, the total negative relay (K-) and the ninth switch (17) are controlled to be disconnected, and the total positive relay (K+) and the tenth switch (18) are closed.
The power battery pack power supply system (100) according to any one of claims 12 to 15, characterized in that the system further comprises:

A boost module (60), the power battery pack (10) is connected to the high-voltage load (40) in sequence through the first switch circuit (20) and the boost module (60) connect;

The controller (50) is used to:

When only one of the first battery module (1) and the second battery module (2) fails, the switch device in the first switch circuit (20) is controlled to be opened and closed so that the failed battery module is disconnected from the high-voltage load (40), and the boost module (60) is controlled to boost the voltage output by the non-failed battery module to supply power to the high-voltage load (40).
The power battery pack power supply system (100) according to claim 16, characterized in that the first switch circuit (20) comprises a total positive relay (K+), a total negative relay (K-) and an eleventh switch (19), the positive electrode of the first battery module (1) is connected to the positive electrode of the high-voltage load (40) through the total positive relay (K+), and the negative electrode of the second battery module (2) is connected to the negative electrode of the high-voltage load (40) through the total negative relay (K-);

The boost module (60) comprises a capacitor (C1), an inverter (61) and a motor (62); the high-voltage load (40) is connected in parallel with the capacitor (C1); the power battery pack (10) is connected to the motor (62) via the inverter (61); the inverter (61) comprises an M-phase bridge arm, M≥3; the first bus end of the M-phase bridge arm is connected to the positive electrode of the high-voltage load (40); the second bus end of the M-phase bridge arm is connected to the negative electrode of the high-voltage load (40); the first end of the M-phase winding of the motor (62) is connected to the midpoint of the M-phase bridge arm in a one-to-one correspondence; the second end of the M-phase winding is connected in common to form a neutral point; the neutral point is connected to the negative electrode of the first battery module (1) via the eleventh switch (19);

The controller (50) is used to:

When the first battery module (1) fails, the total positive relay (K+) is controlled to be disconnected, the total negative relay (K-) and the eleventh switch (19) are closed, and the upper bridge arm and the lower bridge arm of the first bridge arm are controlled to be alternately turned on, so that the second battery module (2) supplies power to the high-voltage load (40) via the capacitor (C1) and the winding corresponding to the first bridge arm, wherein the first bridge arm is any bridge arm among the M-phase bridge arms;

When the second battery module (2) fails, the total negative relay (K-) is controlled to be disconnected, the total positive relay (K+) and the eleventh switch (19) are closed, and the upper bridge arm and the lower bridge arm of the first bridge arm are controlled to be alternately turned on, so that the second battery module (2) supplies power to the high-voltage load (40) via the capacitor (C1) and the winding corresponding to the first bridge arm.
A power battery pack power supply method, characterized in that the power battery pack (10) is connected to a high-voltage load (40) via a first switch circuit (20), and the power battery pack (10) comprises a first battery module (1) and a second battery module (2) connected in series;

The method comprises: when only one of the first battery module (1) and the second battery module (2) fails, controlling the opening and closing of a switch device in the first switch circuit (20) so that the failed battery module is disconnected from a high-voltage load (40), and the high-voltage load (40) is powered by the remaining battery module.
The method according to claim 18, characterized in that the controlling the opening and closing of the switch device in the first switch circuit (20) so as to disconnect the failed battery module from the high-voltage load (40) and to supply power to the high-voltage load (40) from the intact battery module comprises:

The switch components in the first switch circuit (20) are controlled to open and close so that the failed battery module is disconnected from the high-voltage load (40), and the non-failed battery module supplies power to the high-voltage load (40) at the voltage of the non-failed battery module.
The method according to claim 19, characterized in that the first switch circuit (20) comprises a total positive relay (K+), a total negative relay (K-), a sixth switch (14), a seventh switch (15) and an eighth switch (16), the positive electrode of the first battery module (1) is connected to the positive electrode of the high-voltage load (40) through the total positive relay (K+), the negative electrode of the second battery module (2) is connected to the negative electrode of the high-voltage load (40) through the total negative relay (K-), the positive electrode of the second battery module (2) is connected to the positive electrode of the high-voltage load (40) through the sixth switch (14), the negative electrode of the first battery module (1) is connected to the negative electrode of the high-voltage load (40) through the seventh switch (15), and the positive electrode of the second battery module (2) is connected to the negative electrode of the first battery module (1) through the eighth switch (16);

The controlling the opening and closing of the switch device in the first switch circuit (20) comprises:

When the first battery module (1) fails, controlling to disconnect the total positive relay (K+), the seventh switch (15) and the eighth switch (16), and closing the total negative relay (K-) and the sixth switch (14);

When the second battery module (2) fails, the total negative relay (K-), the sixth switch (14) and the eighth switch (16) are controlled to be disconnected, and the total positive relay (K+) and the seventh switch (15) are closed.
The method according to claim 19 is characterized in that the first switch circuit (20) comprises a total positive relay (K+), a total negative relay (K-), a ninth switch (17) and a tenth switch (18), the positive electrode of the first battery module (1) is connected to the positive electrode of the high-voltage load (40) through the total positive relay (K+), the negative electrode of the second battery module (2) is connected to the negative electrode of the high-voltage load (40) through the total negative relay (K-), the negative electrode of the first battery module (1) is connected to the positive electrode of the high-voltage load (40) through the ninth switch (17), and the negative electrode of the first battery module (1) is connected to the negative electrode of the high-voltage load (40) through the tenth switch (18);

The controlling the opening and closing of the switch device in the first switch circuit (20) comprises:

When the first battery module (1) fails, controlling to disconnect the total positive relay (K+) and the tenth switch (18), and closing the total negative relay (K-) and the ninth switch (17);

When the second battery module (2) fails, the total negative relay (K-) and the ninth switch (17) are controlled to be disconnected, and the total positive relay (K+) and the tenth switch (18) are closed.
The method according to any one of claims 18 to 21, characterized in that the power battery pack (10) is connected to the high-voltage load (40) via the first switch circuit (20) and the boost module (60) in sequence;

The controlling of the opening and closing of the switch device in the first switch circuit (20) so as to disconnect the failed battery module from the high-voltage load (40), and the non-failed battery module supplies power to the high-voltage load (40), comprises:

The switch components in the first switch circuit (20) are controlled to open and close so that the failed battery module is disconnected from the high-voltage load (40), and the boost module (60) is controlled to boost the voltage output by the non-failed battery module to supply power to the high-voltage load (40).
The method according to claim 22, characterized in that the first switch circuit (20) comprises a total positive relay (K+), a total negative relay (K-) and an eleventh switch (19), the positive electrode of the first battery module (1) is connected to the positive electrode of the high-voltage load (40) through the total positive relay (K+), and the negative electrode of the second battery module (2) is connected to the negative electrode of the high-voltage load (40) through the total negative relay (K-);

The boost module (60) comprises a capacitor (C1), an inverter (61) and a motor (62); the high-voltage load (40) is connected in parallel with the capacitor (C1); the power battery pack (10) is connected to the motor (62) via the inverter (61); the inverter (61) comprises an M-phase bridge arm, M≥3; the first bus end of the M-phase bridge arm is connected to the positive electrode of the high-voltage load (40); the second bus end of the M-phase bridge arm is connected to the negative electrode of the high-voltage load (40); the first end of the M-phase winding of the motor (62) is connected to the midpoint of the M-phase bridge arm in a one-to-one correspondence; the second end of the M-phase winding is connected in common to form a neutral point; the neutral point is connected to the negative electrode of the first battery module (1) via the eleventh switch (19);

Controlling the opening and closing of the switch device in the first switch circuit (20) to disconnect the failed battery module from the high-voltage load (40), and controlling the boost module (60) to boost the voltage output by the intact battery module to supply power to the high-voltage load (40), comprising:

When the first battery module (1) fails, the total positive relay (K+) is controlled to be disconnected, the total negative relay (K-) and the eleventh switch (19) are closed, and the upper bridge arm and the lower bridge arm of the first bridge arm are controlled to be alternately turned on, so that the second battery module (2) supplies power to the high-voltage load (40) via the capacitor (C1) and the winding corresponding to the first bridge arm, wherein the first bridge arm is any bridge arm among the M-phase bridge arms;

When the second battery module (2) fails, the total negative relay (K-) is controlled to be disconnected, the total positive relay (K+) and the eleventh switch (19) are closed, and the upper bridge arm and the lower bridge arm of the first bridge arm are controlled to be alternately turned on, so that the second battery module (2) supplies power to the high-voltage load (40) via the capacitor (C1) and the winding corresponding to the first bridge arm.
An electronic device, characterized in that it comprises a processor, wherein the processor is used to execute the method described in any one of claims 18-23.
A vehicle, characterized by comprising a power battery pack power supply system according to any one of claims 1 to 17 or an electronic device according to claim 24.