CN118017644A

CN118017644A - Control method and device of power supply circuit, vehicle and storage medium

Info

Publication number: CN118017644A
Application number: CN202410176011.9A
Authority: CN
Inventors: 任德强; 李华图
Original assignee: Xiaomi Automobile Technology Co Ltd
Current assignee: Xiaomi Automobile Technology Co Ltd
Priority date: 2024-02-07
Filing date: 2024-02-07
Publication date: 2024-05-10

Abstract

The present disclosure relates to a control method of a power supply circuit, a device, a power supply circuit, a vehicle, and a storage medium, the power supply circuit including a first battery pack, a second battery pack, a first switch pack, a second switch pack, and a target dc converter, the method including: acquiring a first voltage of the first battery pack and a second voltage of the second battery pack; determining that the first voltage and the second voltage meet preset conditions, and controlling the switching states of the first switch group and/or the second switch group; and controlling the target direct current converter to take electricity from the first battery pack and/or the second battery pack in the switch state, wherein the target direct current converter is used for supplying power when the vehicle is in a dormant state. The equalization of the battery pack can be simply and flexibly realized by controlling the first switch group and the second switch group.

Description

Control method and device of power supply circuit, vehicle and storage medium

Technical Field

The disclosure relates to the technical field of power supply, and in particular relates to a control method and device of a power supply circuit, the power supply circuit, a vehicle and a storage medium.

Background

With the development of automobile technology, electrically driven vehicles are becoming popular, and high-grade auxiliary driving technology is also becoming applied. In electrically driven vehicles, there are usually a high-voltage network on board the vehicle for driving the vehicle and a low-voltage network for controlling the functions of the vehicle, lighting, entertainment, etc., wherein both the high-voltage and the low-voltage networks belong to a power supply circuit. Therefore, how to better control the power supply circuit is a technical problem to be solved.

Disclosure of Invention

To overcome the problems in the related art, the present disclosure provides a control method of a power supply circuit, a device, a power supply circuit, a vehicle, and a storage medium.

According to a first aspect of embodiments of the present disclosure, there is provided a control method of a power supply circuit including a first battery pack, a second battery pack, a first switch group, a second switch group, and a target dc converter, the method including:

acquiring a first voltage of the first battery pack and a second voltage of the second battery pack;

Determining that the first voltage and the second voltage meet preset conditions, and controlling the switching states of the first switch group and/or the second switch group;

And controlling the target direct current converter to take electricity from the first battery pack and/or the second battery pack in the switch state, wherein the target direct current converter is used for supplying power when the vehicle is in a dormant state.

Optionally, the determining that the first voltage and the second voltage meet a preset condition, controlling a switch state of the first switch group and/or the second switch group includes:

determining that the first voltage is greater than the second voltage, closing the first switch set, and opening the second switch set;

the controlling the target dc converter to take power from the first battery pack and/or the second battery pack in the switch state includes:

and controlling the target direct current converter to take electricity from the first battery pack.

Optionally, the determining that the first voltage and the second voltage meet a preset condition, controlling a switch state of the first switch group and/or the second switch group, further includes:

determining that the first voltage is less than the second voltage, opening the first switch set, and closing the second switch set;

the controlling the dc converter to take power from the first battery pack and/or the second battery pack in the switch state includes:

And controlling the target direct current converter to take electricity from the second battery pack.

Determining that the first voltage is equal to the second voltage, closing the first switch set, and closing the second switch set;

And controlling the target direct current converter to take electricity from the first battery pack and the second battery pack.

Optionally, the power supply circuit further comprises a break switch;

the determining that the first voltage and the second voltage meet a preset condition, and controlling the switch states of the first switch group and/or the second switch group includes:

Determining that the first voltage and the second voltage meet a preset condition, and opening the circuit breaker, wherein the preset condition comprises that the first voltage is larger than the second voltage or the first voltage is smaller than the second voltage;

and controlling the switching state of the first switch group and/or the second switch group.

Optionally, the first switch group includes a first switch and a second switch, the second switch group includes a third switch and a fourth switch, the method further includes:

determining that the first voltage and the second voltage do not meet preset conditions, and closing the circuit breaker;

Closing the first switch and the fourth switch respectively, and opening the second switch and the third switch respectively;

According to a second aspect of the embodiments of the present disclosure, there is provided a control device of a power supply circuit including a first battery pack, a second battery pack, a first switch group, a second switch group, and a target dc converter, the device including:

An acquisition module configured to acquire a first voltage of the first battery pack and a second voltage of the second battery pack;

The determining module is configured to determine that the first voltage and the second voltage meet a preset condition and control the switching state of the first switch group and/or the second switch group;

And the control module is configured to control the target direct current converter to take electricity from the first battery pack and/or the second battery pack in the switch state.

According to a third aspect of embodiments of the present disclosure, there is provided a power supply circuit including a first battery pack, a second battery pack, a first switch pack, a second switch pack, a target dc converter, and a controller;

The first end of the first switch group is connected with the first battery group, and the second end of the first switch group is connected with the target direct current converter;

the first end of the second switch group is connected with the second battery group, and the second end of the second switch group is connected with the target direct current converter;

The controller is connected with the first battery pack, the second battery pack, the first switch pack and the second switch pack respectively, and is used for controlling the switch state of the first switch pack and/or the second switch pack when the first voltage of the first battery pack and the second voltage of the second battery pack meet preset conditions, and controlling the target direct current converter to take electricity from the first battery pack and/or the second battery pack in the switch state.

According to a fourth aspect of embodiments of the present disclosure, there is provided a vehicle comprising:

The power supply circuit comprises a first battery pack, a second battery pack, a first switch group, a second switch group and a target direct current converter;

A processor;

a memory for storing processor-executable instructions;

wherein the processor is configured to:

and controlling the target direct current converter to take electricity from the first battery pack and/or the second battery pack in the switch state.

According to a fifth aspect of embodiments of the present disclosure, there is provided a computer-readable storage medium having stored thereon computer program instructions which, when executed by a processor, implement the steps of the control method of the power supply circuit provided by the first aspect of the present disclosure.

According to a sixth aspect of embodiments of the present disclosure, there is provided a computer program product comprising computer programs/instructions which, when executed by a processor, implement the steps of the method of controlling a power supply circuit provided by the first aspect of the present disclosure.

The equalization control of the battery in the power supply circuit can be simply and effectively achieved by introducing the first switch group and the second switch group, wherein the power supply circuit can comprise the first battery group, the second battery group, the first switch group, the second switch group and the target direct current converter, specifically, the first voltage of the first battery group and the second voltage of the second battery group are obtained, on the basis, the first voltage and the second voltage are determined to meet preset conditions, the on-off state of the first switch group and/or the second switch group is controlled, and the target direct current converter is controlled to take electricity from the first battery group and/or the second battery group in the on-off state, wherein the target direct current converter is used for supplying power when a vehicle is in a dormant state, so that the discharging requirement of the battery can be reduced while the equalization cost of the battery group is reduced.

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

Drawings

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

Fig. 1 is a flowchart illustrating a control method of a power supply circuit according to an exemplary embodiment.

Fig. 2 is a schematic diagram of a power supply circuit in a control method of the power supply circuit according to an exemplary embodiment.

Fig. 3 is a flowchart illustrating another control method of a power supply circuit according to an exemplary embodiment.

Fig. 4 is a schematic diagram of a target dc converter drawing power from a first battery pack in another control method of a power supply circuit according to an exemplary embodiment.

Fig. 5 is a schematic diagram of a target dc converter drawing power from a second battery pack in another control method of a power supply circuit according to an exemplary embodiment.

Fig. 6 is a schematic diagram of a target dc converter drawing power from a first battery pack and a second battery pack in another control method of a power supply circuit according to an exemplary embodiment.

Fig. 7 is a schematic diagram of a target dc converter drawing power from a first battery pack and a second battery pack in another control method of a power supply circuit according to an exemplary embodiment.

Fig. 8 is a block diagram of a control device of a power supply circuit according to an exemplary embodiment.

Fig. 9 is a functional block diagram of a vehicle shown in an exemplary embodiment.

Detailed Description

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

In the description of the present disclosure, terms such as "first," "second," and the like are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. In addition, unless otherwise stated, in the description with reference to the drawings, the same reference numerals in different drawings denote the same elements.

Although operations or steps are described in a particular order in the figures in the disclosed embodiments, it should not be understood as requiring that such operations or steps be performed in the particular order shown or in sequential order, or that all illustrated operations or steps be performed, to achieve desirable results. In embodiments of the present disclosure, these operations or steps may be performed serially; these operations or steps may also be performed in parallel; some of these operations or steps may also be performed.

In the related art, a vehicle can be provided with a redundant low-voltage power grid, and the redundant low-voltage power grid can enable safety related equipment such as braking, steering and illumination of the vehicle to realize double-power-grid redundant power supply, so that the safety of the vehicle can be improved. In other words, the vehicle can be configured with a plurality of vehicle-mounted low-voltage power grids, and through DCDC configuration of different power levels, the vehicle can meet the higher-efficiency electricity consumption requirement in the situations of an inactive state or a static dormant state and the like.

After the vehicle is dormant, the power supply circuit is mainly powered by the low-voltage battery, so that the electric quantity of the low-voltage battery can be consumed, and the electric quantity of the low-voltage battery is gradually reduced. In addition, as the low-voltage battery capacity of the vehicle is configured to be smaller and smaller with the development of the related art, the speed of the power shortage state of the low-voltage battery is increased, so that the vehicle needs to wake up the intelligent power supply system more frequently. Specifically, the vehicle needs to supplement power to the low-voltage battery through a main DCDC (Direct current-Direct current converter) converter, but in the sleep state, the power required by the vehicle is smaller, and the efficiency of the main DCDC is lower.

In some embodiments, the power supply circuit of the vehicle may include a first battery pack and a second battery pack, and may be powered by the other non-failed battery pack when either one of the first battery pack and the second battery pack fails. However, the first battery pack and the second battery pack may cause imbalance of the remaining power in the first battery pack and the second battery pack due to factors such as imbalance of charging, imbalance of battery aging, use imbalance or temperature influence, which may further cause conditions such as reduction of the endurance mileage of the vehicle and unstable charging process.

Fig. 1 is a flowchart illustrating a control method of a power supply circuit according to an exemplary embodiment, and as shown in fig. 1, the method may include the following steps.

In step S11, a first voltage of the first battery pack and a second voltage of the second battery pack are acquired.

In the embodiment of the disclosure, the structure of the power supply circuit may be as shown in fig. 2, and it is known through fig. 2 that the power supply circuit may include: first battery pack VCC1, second battery pack VCC2, first switch pack 110, second switch pack 120, target dc converter DCDC, controller 130, low voltage load 140, and high voltage load 150.

The first battery set VCC1 and the second battery set VCC2 may be high-voltage battery sets, that is, the first battery set VCC1 and the second battery set VCC2 may be power batteries on a vehicle. In addition, the first and second battery packs VCC1 and VCC2 may be used to power the low voltage load 140 in the low voltage power grid, and may also be used to power the high voltage load 150 in the high voltage power grid. In general, the voltage is 1KV or more and is called high voltage, and the voltage is 1KV or less and is called low voltage.

In the embodiment of the disclosure, the first battery VCC 1and the second battery VCC2 may form a high-voltage redundancy circuit, and when any one of the first battery VCC 1and the second battery VCC2 fails, power may be continuously supplied through the other battery, so as to ensure operation of the vehicle. The positive pole of the first battery VCC1 can be connected with the high-voltage power network through the total positive relay K6, and the negative pole of the second battery VCC2 can be connected with the high-voltage power network through the total negative relay K7. Here, a low voltage power grid may be used to power at least one low voltage load, such as the first low voltage load 121, and a high voltage power grid may be used to power at least one high voltage load 151.

In some embodiments, a break switch K5 may be connected between the first battery VCC1 and the second battery VCC2, where the break switch K5 may be any one of a fuse and a safety switch, and the safety switch refers to a pyrotechnic switch or an intelligent fuse. Here, the cut-off switch K5 may be used to open when the vehicle is dormant or open when the high-voltage power grid fails. When the disconnecting switch K5 is closed, the negative electrode of the first battery pack VCC1 is connected with the positive electrode of the second battery pack VCC2, and the first battery pack VCC1 and the second battery pack VCC2 form an integral high-voltage battery pack; when the cut-off switch K5 is turned off, the negative electrode of the first battery VCC1 and the negative electrode of the second battery VCC2 are grounded, respectively. The positive electrode of the first battery VCC1 may be connected to the first switch group 110, and the positive electrode of the second battery VCC2 may be connected to the second switch group 120.

Here, the first and second switch groups 110 and 120 may be referred to as control switches, one ends of which may be connected to the first and second battery groups VCC1 and VCC2, respectively, and the other ends of which may be connected to the target dc converter DCDC. The control switch is configured to switch on/off a loop between the first battery VCC1 and the target dc converter DCDC according to a voltage relationship between the first battery VCC1 and the second battery VCC2, and/or switch on/off a loop between the second battery VCC2 and the target dc converter DCDC, where the switch on/off may be controlled by the controller 130 according to a comparison result of the first voltage and the second voltage.

For example, after the loop between the first battery VCC1 and the target dc converter DCDC is turned on, the electric quantity of the first battery VCC1 may be discharged to the fourth low-voltage load 144 through the target dc converter DCDC; after the loop between the second battery VCC2 and the target dc converter DCDC is turned on, the electric quantity of the second battery VCC2 may be discharged to the fourth low-voltage load 144 through the target dc converter DCDC.

In the embodiment of the present disclosure, the target dc converter DCDC may be a DCDC converter, configured to convert the high-voltage dc power of the first battery VCC1 and/or the second battery VCC2 into the low-voltage dc power that may be used by the fourth low-voltage load 144 after receiving the current of the first battery VCC1 and/or the second battery VCC2, so as to supply power to the fourth low-voltage load 144.

Here, the target dc converter DCDC may be a micro dc converter, wherein the power of the micro dc converter is smaller than the preset power, i.e. the power of the micro dc converter is smaller than the power of a conventional dc converter. For example, the power of a miniature dc converter may be less than 100W, whereas conventional dc converters have a power greater than or equal to 100W and less than or equal to 5KW. By configuring the vehicle with one or more micro DCDC, the energy conversion efficiency in the vehicle sleep state can be improved.

The voltage of the low voltage load 140 is typically low voltage such as 12V, 14V or 24V, and the low voltage load 140 may be an independent electrical appliance, or may be some electrical appliance of the first low voltage load 141, the second low voltage load 142, the third low voltage load 143 or the fourth low voltage load 144 shown in fig. 2, which is not limited in this disclosure. Here, the first low voltage load 121 may be a type of low voltage load powered by the power grid 1; the second low voltage load 142 may be a type of low voltage load powered by the power grid 2; the third low voltage load 143 may be a type of low voltage load that is supplied with power by the two networks of the low voltage network 1 and the low voltage network 2 in a redundant manner; the fourth low voltage load 144 may be a type of low voltage load powered by a micro dc converter.

As known from the above description, in the related art, since the capacity configuration of the vehicle to the low-voltage battery VCC3 is smaller, the low-voltage battery VCC3 is frequently depleted, and the vehicle frequently wakes up the intelligent power supplementing system and the main dc converter to supplement power to the low-voltage battery VCC 3. In addition, since the power required for the low-voltage battery VCC3 is low and the main dc converter itself is a high-power converter, the efficiency of the main dc converter is low. For example, after the main dc converter obtains 100 electric power, only 10 electric power is needed to be supplied to the low-voltage battery VCC3, and the remaining 90 electric power converted will be wasted, resulting in lower electric power utilization rate after conversion of the main dc converter.

The embodiment of the disclosure can convert the electric quantity released by the first battery VCC1 and the second battery VCC2 through the target dc converter DCDC when the vehicle is in the sleep state, and then supply the converted current to the low-voltage load 144. In the first aspect, since the target dc converter DCDC is configured to convert the electric quantities of the first battery VCC1 and the second battery VCC2, and further power is supplied to the fourth low-voltage load 144 by the electric quantity converted by the target dc converter DCDC, and the fourth low-voltage load 144 is not required to be supplied with power by the battery VCC3, the situation that the battery VCC3 is frequently deficient in power and frequently wakes up the intelligent power supply system is avoided; in the second aspect, since the target dc converter DCDC is a low-power converter, the efficiency of the target dc converter DCDC is higher. For example, when the target dc converter DCDC obtains 10 electric quantities, all the conversion currents of the 10 electric quantities are provided to the fourth low-voltage load 144, so that the converted electric quantities are less wasted, and the electric quantity utilization rate is higher.

In the related art, in order to balance the electric power of the first battery VCC1 and the second battery VCC2, a controller and two high-power bidirectional dc converters are additionally configured to control the electric power of the first battery VCC1 and the second battery VCC2 to reach balance, however, each time the electric power balance is performed, two high-power bidirectional dc converters need to be started, which definitely results in higher electric power balance cost.

According to the embodiment of the disclosure, the switching states of the first switch group and/or the second switch group are controlled through the voltage magnitude relation between the first battery group VCC1 and the second battery group VCC2 so as to conduct or break a loop between at least one battery group in the first battery group VCC1 and the second battery group VCC2 and the target direct current converter DCDC, thereby realizing electric quantity release in the first battery group VCC1 and/or the second battery group VCC2, and further enabling the electric quantity between the first battery group VCC1 and the second battery group VCC2 to tend to be balanced. In this process, since the embodiment of the disclosure configures the first switch group, the second switch group and the target dc converter DCDC, the electric quantity equalization between the two battery groups can be achieved, and two high-power dc converters are not required to be configured, so that the electric quantity equalization cost is lower.

In the embodiment of the disclosure, one end of the first switch group 110 may be connected to the first battery group VCC1, the other end of the first switch group 110 may be connected to the target dc converter DCDC, and the first switch group 110 is configured to switch on/off a loop between the first battery group VCC1 and the target dc converter DCDC; one end of the second switch group 120 is connected to the second battery group VCC2, the other end of the second switch group 120 is connected to the target dc converter DCDC, and the second switch group 120 is used to turn on/off the loop between the second battery group VCC2 and the target dc converter DCDC. Here, the on/off of the first and second switch groups 110 and 110 may be controlled by the controller 130.

As is known from the above description, the power supply circuit may include the controller 130 in addition to the first and second battery packs VCC1 and VCC2, and the controller 130 may include the first, second, and third controllers 131, 132, and 133. Wherein the first controller 131 may be a Master controller (controller-Master), and the second controller 132 and the third controller 133 may be slave controllers.

Specifically, the embodiment of the present disclosure may sample the voltage of the first battery VCC1 through the second controller 132 to obtain the first voltage, and sample the voltage of the second battery VCC2 through the third controller 133 to obtain the second voltage. The first controller 131 may receive voltage sampling signals of the second controller 132 and the third controller 133, that is, receive the first voltage and the second voltage, and on the basis of this, the first controller 131 may analyze and compare the first voltage and the second voltage to obtain a comparison result, and based on the comparison result, the first controller may control the power and the electricity output by the dc converter.

In summary, the first controller 131 of the controller 130 may receive the voltage sampling signals of the second controller 132 and the third controller 133, and compare the two voltage sampling signals to obtain a comparison result. Based on this, the first controller 131 may transmit a control instruction of closing/opening to the second controller 132 and the third controller 133 according to the comparison result. At this time, the second controller 132 and the third controller 133 may control the first switch group 110/the second switch group 120 to perform the on/off command after receiving the control command.

In this process, the second controller 132 may sample the voltage of the first battery pack VCC1 and may control the on-off of the first switch pack 110. Here, the first switch group 110 may include a first switch K1 and a second switch K2, and the first switch K1 and the second switch K2 may be relays, and the embodiment of the present disclosure may control the on/off of the first power taking circuit based on the first switch K1 and the second switch K2. The first power taking loop may be a loop in which the target dc converter DCDC takes power from the first battery VCC 1.

Alternatively, the third controller 133 may sample the voltage of the second battery pack VCC2 and may control the on-off of the second switch pack 120. Here, the second switch group 120 may include a third switch K3 and a fourth switch K4, and the third switch K3 and the fourth switch K4 may be relays, and the embodiment of the present disclosure may control the on/off of the second power taking circuit based on the third switch K3 and the fourth switch K4. The second power taking loop may be a loop in which the target dc converter DCDC takes power from the second battery VCC 2.

In addition, the charging circuit may further include a precharge relay K8 and a precharge resistor R.

As an alternative, the embodiment of the present disclosure may acquire the first voltage of the first battery VCC1 and acquire the second voltage of the second battery VCC 2. On the basis of this, it is determined whether the first voltage and the second voltage satisfy a preset condition. Here, the first voltage of the first battery pack VCC1 may be an amount of electricity or a remaining amount of electricity of the first battery pack VCC1, and the second voltage of the second battery pack VCC2 may be an amount of electricity or a remaining amount of electricity of the second battery pack VCC 2.

In step S12, it is determined that the first voltage and the second voltage satisfy the preset condition, and the switching states of the first switch group and/or the second switch group are controlled.

Alternatively, the first voltage of the first battery pack and the second voltage of the second battery pack are obtained. The embodiment of the disclosure can determine whether the first voltage and the second voltage meet the preset conditions, and if the first voltage and the second voltage meet the preset conditions, control the switch states of the first switch group and/or the second switch group based on the preset conditions.

Here, the preset condition may be that the first voltage is greater than the second voltage, or that the first voltage is less than the second voltage, or that the first voltage is equal to the second voltage, and if the preset conditions are different, the control of the switch states of the first switch group and/or the second switch group is also different. That is, the embodiments of the present disclosure may switch the switching state of the first switch group and/or the second switch group to the target state according to a preset condition when it is determined that the first voltage and the second voltage satisfy the preset condition.

In step S13, the control target dc converter takes power from the first battery pack and/or the second battery pack in the on-off state.

As an alternative, after controlling the switching states of the first and/or second switch groups, embodiments of the present disclosure may control the target dc converter to draw power from the first and/or second battery groups in the target state. In other words, the target dc converter is controlled to draw power from the first battery pack and/or the second battery pack when the first switch pack and/or the second switch pack is in the target state.

Through the above description, it is known that the target dc converter may be a micro dc converter, and when the vehicle is in a sleep state, the micro dc converter is used to supply power to the load, so that not only can the power required by the low-power electrical appliance be provided, but also the main dc converter with low use efficiency in low power can be avoided, thereby improving the power supply efficiency.

The embodiment of the disclosure can simply and effectively realize the balance control of the battery in the power supply circuit by introducing the first switch group and the second switch group, wherein the power supply circuit can comprise the first battery group, the second battery group, the first switch group, the second switch group and the target direct current converter, specifically, the first voltage of the first battery group and the second voltage of the second battery group are obtained, on the basis, the first voltage and the second voltage are determined to meet the preset conditions, the switch state of the first switch group and/or the second switch group is controlled, and the target direct current converter is controlled to take electricity from the first battery group and/or the second battery group under the switch state. Here, the target dc converter is used for supplying power when the vehicle is in a dormant state, so that the requirement of discharging the battery pack can be reduced while the equalization cost of the battery pack is reduced, namely, the load is supplied with power through the miniature dc converter when the vehicle is dormant, the requirement of charging and discharging the battery pack can be reduced, and the service life of the battery can be prolonged.

Fig. 3 is a flowchart illustrating another control method of a power supply circuit according to an exemplary embodiment, which may include the following steps, as shown in fig. 3.

In step S21, a first voltage of the first battery pack and a second voltage of the second battery pack are acquired.

The foregoing embodiments of the specific implementation manner of step S21 have been described in detail, and will not be described herein.

In step S22, it is determined that the first voltage is greater than the second voltage, the first switch group is closed, and the second switch group is opened.

As an alternative, after the first voltage of the first battery pack and the second voltage of the second battery pack are obtained, if it is determined that the first voltage is greater than the second voltage, the embodiments of the present disclosure may close the first switch pack and open the second switch pack. That is, the controller may switch the switching state of the first switching group to the closed state and switch the switching state of the second switching group to the open state. On the basis of this, the control target dc converter takes power from the first battery pack, i.e., proceeds to step S23.

In step S23, the control target dc converter takes power from the first battery pack.

In the embodiment of the disclosure, when the switch state of the first switch group is the closed state and the switch state of the second switch group is the open state, the target dc converter may draw power from the first battery group, and a specific power-drawing circuit may be as shown in fig. 4. As is known from fig. 4, when the first voltage of the first battery VCC1 is greater than the second voltage of the second battery VCC2, the first controller 131 may control the first switch group 110 to be closed through the second controller 132 and the second switch group 120 to be opened through the third controller 133, so that the target dc converter DCDC may be powered from the first battery VCC 1.

As a specific embodiment, the first controller 131 determines that U1 > U2 by comparing after receiving the voltage sampling signals U1 and U2 transmitted from the second controller 132 and the third controller 133. At this time, the first controller 131 may transmit an instruction to close the relay to the second controller 132, and transmit an instruction to open the relay to the third controller 133. The second controller 132 may close the first switch group 110, i.e., close the first switch K1 and the second switch K2, after receiving the closing instruction. Meanwhile, the third controller 133 may turn off the third switch K3 and/or the fourth switch K4, such as turning off the third switch K3, after receiving the off command. On this basis, the target dc converter DCDC may take power from the first battery VCC 1.

It should be noted that, in the process of taking power from the first battery pack by the target dc converter, the controller may monitor the first voltage of the first battery pack and the second voltage of the second battery pack to determine whether the first voltage and the second voltage tend to be equal, and if so, may close the second switch group to enable the target dc converter to take power from the first battery pack and the second battery pack.

As shown in fig. 4, the first controller 131 may monitor the voltages of the first and second battery packs VCC1 and VCC2 in real time. That is, the first controller 131 may receive the voltage sampling signals U1 and U2 transmitted from the second controller 132 and the third controller 133 and compare the collected voltage signals. If U1≡U2 is determined, the first controller 131 may send an instruction to close the relay to the third controller 133, through which third controller 133 the second switch group 120 may be closed, so that the target DC converter may be powered from the first battery group VCC1 and the second battery group VCC 2.

In step S24, it is determined that the first voltage is smaller than the second voltage, the first switch group is opened, and the second switch group is closed.

As an alternative, after the first voltage of the first battery pack and the second voltage of the second battery pack are obtained, if it is determined that the first voltage is less than the second voltage, the embodiments of the present disclosure may close the second switch pack and open the first switch pack. That is, the controller may switch the switching state of the second switching group to the closed state and switch the switching state of the first switching group to the open state. On the basis of this, the control target dc converter takes power from the second battery pack, i.e., proceeds to step S25.

In step S25, the control target dc converter takes power from the second battery pack.

In the embodiment of the disclosure, when the switch state of the second switch group is the closed state and the switch state of the first switch group is the open state, the target dc converter may draw power from the second battery group, and a specific power-drawing circuit may be as shown in fig. 5. As is known from fig. 5, when the first voltage of the first battery VCC1 is less than the second voltage of the second battery VCC2, the first controller 131 may control the first switch group 110 to be opened through the second controller 132, and the second switch group 120 to be closed through the third controller 133, so that the target dc converter DCDC may be powered from the second battery VCC 2.

As a specific embodiment, the first controller 131 determines U1< U2 by comparing after receiving the voltage sampling signals U1 and U2 transmitted from the second controller 132 and the third controller 133. At this time, the first controller 131 may transmit an instruction to open the relay to the second controller 132, and an instruction to close the relay to the third controller 133. The second controller 132 may open the first switch group 110, i.e. open the first switch K1 and/or the second switch K2, such as the second switch K2, after receiving the opening command. Meanwhile, the third controller 133 may close the third switch K3 and the fourth switch K4 after receiving the closing instruction. On this basis, the target dc converter DCDC may take power from the second battery VCC 2.

It should be noted that, in the process of taking power from the second battery pack by the target dc converter, the controller may monitor the first voltage of the first battery pack and the second voltage of the second battery pack to determine whether the first voltage and the second voltage tend to be equal, and if so, may close the first switch group to enable the target dc converter to take power from the first battery pack and the second battery pack.

As shown in fig. 5, the first controller 131 may monitor the voltages of the first and second battery packs VCC1 and VCC2 in real time. That is, the first controller 131 may receive the voltage sampling signals U1 and U2 transmitted from the second controller 132 and the third controller 133 and compare the collected voltage signals. If U1≡U2 is determined, the first controller 131 may send an instruction to close the relay to the second controller 132, through which the second controller 132 may close the first switch group 110, so that the target DC converter may draw power from the first battery group VCC1 and the second battery group VCC 2.

In step S26, it is determined that the first voltage is equal to the second voltage, the first switch group is closed, and the second switch group is closed.

As an alternative, after the first voltage of the first battery pack and the second voltage of the second battery pack are obtained, if the first voltage is determined to be approximately equal to the second voltage, the embodiments of the present disclosure may close the first switch pack and the second switch pack. That is, the controller may switch the switching state of the first switching group to the closed state and switch the switching state of the second switching group to the closed state. On the basis of this, the control target dc converter takes power from the first battery pack and the second battery pack, i.e., proceeds to step S27.

In step S27, the control target dc converter takes power from the first battery pack and the second battery pack.

In the embodiment of the disclosure, when the switch states of the first battery pack and the second switch pack are both closed states, the target dc converter may draw power from the first battery pack and the second battery pack, and a specific power-drawing circuit may be shown in fig. 6. As is known from fig. 6, when the first voltage of the first battery VCC1 is approximately equal to the second voltage of the second battery VCC2, the first controller 131 may control the first switch group 110 to be closed through the second controller 132, and control the second switch group 120 to be closed through the third controller 133, so that the target dc converter DCDC may take power from the first battery VCC1 and the second battery VCC 2.

As a specific embodiment, the first controller 131 determines u1≡u2 by comparing after receiving the voltage sampling signals U1 and U2 transmitted from the second controller 132 and the third controller 133. At this time, the first controller 131 may transmit an instruction to close the relay to the second controller 132, and transmit an instruction to close the relay to the third controller 133. The second controller 132 may close the first switch group 110, i.e., close the first switch K1 and the second switch K2, after receiving the closing instruction. Meanwhile, the third controller 133 may close the third switch K3 and the fourth switch K4 after receiving the closing instruction. On this basis, the target dc converter DCDC may take power from the first and second battery packs VCC1 and VCC 2.

It should be noted that, in the embodiment of the present disclosure, the first voltage and the second voltage are equal, and the difference between the first voltage and the second voltage may be less than a preset value. That is, when it is determined that the voltage difference between the first voltage and the second voltage is less than the preset value, it is determined that the first voltage and the second voltage are equal. Here, the voltage difference between the first voltage and the second voltage may be an absolute difference value. For example, if it is determined that the voltage difference |U1-U2| between the first voltage U1 and the second voltage U2 is 2V, it is determined that the first voltage and the second voltage are equal, and the preset value at this time is 2V.

As an alternative, after the first voltage and the second voltage are obtained, if it is determined that the first voltage and the second voltage meet a preset condition, the embodiment of the disclosure may open the circuit breaker, where the preset condition may include that the first voltage is greater than the second voltage, or that the first voltage is less than the second voltage. That is, upon determining that the voltage difference between the first voltage and the second voltage is greater than the preset difference, the embodiments of the present disclosure may open the circuit breaker. On the basis of this, the switching state of the first switch group and/or the second switch group is controlled.

Specifically, when it is determined that the voltage difference between the first voltage and the second voltage is greater than a preset difference and it is determined that the first voltage is greater than the second voltage, the embodiment of the present disclosure may open the circuit breaker switch and the second switch group and close the first switch group to control the target dc converter to draw power from the first battery group.

Optionally, when it is determined that the voltage difference between the first voltage and the second voltage is greater than the preset difference and it is determined that the first voltage is less than the second voltage, the embodiment of the disclosure may open the circuit breaker switch and the first switch group and close the second switch group to control the target dc converter to draw power from the second battery group.

As another alternative, embodiments of the present disclosure may close the disconnect switch if it is determined that the first voltage and the second voltage do not meet the preset condition. That is, the embodiment of the present disclosure may close the open circuit switch when it is determined that the voltage difference between the first voltage and the second voltage is less than the preset difference. On the basis, the first switch and the fourth switch are respectively closed, the second switch and the third switch are respectively opened, and the target direct current converter is controlled to take electricity from the first battery pack and the second battery pack, as shown in fig. 7 in detail, at the moment, the first battery pack and the second battery pack form a loop.

In other words, upon determining that the first voltage and the second voltage are approximately equal, embodiments of the present disclosure may close the disconnect switch as well as open the disconnect switch. The circuit for opening the circuit breaker may be as shown in fig. 6, and the circuit for closing the circuit breaker may be as shown in fig. 7.

Referring to fig. 7, when the breaking switch is closed, the first controller 131 determines u1≡u2 by comparing after receiving the voltage sampling signals U1 and U2 transmitted from the second controller 132 and the third controller 133. At this time, the first controller 131 may transmit a control instruction of the relay to the second controller 132 and the third controller 133. The second controller 132 may close the first switch K1 and open the second switch after receiving the control instruction. Meanwhile, the third controller 133 may close the fourth switch K4 and open the third switch K3 after receiving the control instruction. On this basis, the target dc converter DCDC may take power from the first and second battery packs VCC1 and VCC 2.

As another alternative, after determining that the first voltage and the second voltage do not meet the preset conditions and closing the circuit breaker, the embodiment of the disclosure may monitor whether the first switch or the fourth switch fails, and if the first switch or the fourth switch fails, and when the current cannot pass, the embodiment of the disclosure may open the circuit breaker, so as to ensure the effectiveness and flexibility of charging of the target dc charger.

As an example, after determining that the voltage difference between the first voltage and the second voltage is smaller than the preset difference and closing the shutdown switch, it is detected that the fourth switch fails, and at this time, the shutdown switch may be controlled to be opened and the target dc converter may be controlled to draw power from the first battery pack.

As another example, after determining that the voltage difference between the first voltage and the second voltage is smaller than the preset difference and closing the disconnect switch, it is detected that the first switch fails, and at this time, the disconnect switch may be controlled to be opened and the target dc converter may be controlled to draw power from the second battery pack.

When the vehicle is in the sleep state, the disconnection switch between the first battery pack and the first battery pack may be in the closed state or may be in the open state. For example, when the vehicle is dormant, the disconnection switch may be closed when the voltage difference between the first voltage of the first battery pack and the second voltage of the second battery pack is less than a preset difference. For another example, when the vehicle is dormant, the disconnection switch may be turned off when the voltage difference between the first voltage of the first battery pack and the second voltage of the second battery pack is greater than a preset difference.

According to the embodiment of the disclosure, through the four relay matrixes (the first switch and the second switch group) at the input end of the miniature direct-current converter, the first battery group and the second battery group can be driven to supply power in turn, so that unbalance of voltage/State of Charge (SOC) can be avoided, and active equalization is realized.

The embodiment of the disclosure can simply and effectively realize balanced control of the battery in the power supply circuit by introducing the first switch group and the second switch group, wherein the power supply circuit can comprise the first battery group, the second battery group, the first switch group, the second switch group and the target direct current converter, specifically, the first voltage of the first battery group and the second voltage of the second battery group are obtained, on the basis, the first voltage and the second voltage are determined to meet the preset conditions, the on-off state of the first switch group and/or the second switch group is controlled, and the target direct current converter is controlled to take power from the first battery group and/or the second battery group in the on-off state, wherein the target direct current converter is used for supplying power when a vehicle is in a dormant state, so that the discharging requirement of the battery can be reduced while the balanced cost of the battery groups is reduced. In addition, the miniature direct current converter in the embodiment of the disclosure can realize alternate power supply of the first battery pack and/or the second battery pack through a loop formed by four relays, namely, the first battery pack and/or the second battery pack are powered by the battery pack with high voltage, and the first battery pack and/or the second battery pack are powered alternately or simultaneously, so that active equalization of the first battery pack and/or the second battery pack can be realized.

Fig. 8 is a block diagram of a control apparatus of a power supply circuit according to an exemplary embodiment, wherein the power supply circuit includes a first battery pack, a second battery pack, a first switch pack, a second switch pack, and a target dc converter. Referring to fig. 8, the control 300 of the power supply circuit includes an acquisition module 310, a determination module 320, and a control module 330.

The acquisition module 310 is configured to acquire a first voltage of the first battery pack and a second voltage of the second battery pack;

The determining module 320 is configured to determine that the first voltage and the second voltage meet a preset condition, and control a switching state of the first switch group and/or the second switch group;

The control module 330 is configured to control the target dc converter to draw power from the first battery pack and/or the second battery pack in the switch state.

In some implementations, the determination module 320 can include:

A first determination submodule configured to determine that the first voltage is greater than the second voltage, close the first switch set, and open the second switch set;

The control module 330 may include:

And the first control submodule is configured to control the target direct current converter to take electricity from the first battery pack.

In some implementations, the determination module 320 can further include:

a second determination submodule configured to determine that the first voltage is less than the second voltage, open the first switch set, and close the second switch set;

The control module 330 may include:

And a second control sub-module configured to control the target DC converter to draw power from the second battery pack.

In some implementations, the determination module 320 can further include:

a third determination submodule configured to determine that the first voltage is equal to the second voltage, close the first switch bank, and close the second switch bank;

The control module 330 may include:

And a third control sub-module configured to control the target dc converter to draw power from the first battery pack and the second battery pack.

In some embodiments, the power supply circuit further includes a break switch determining module 320 may be further configured to determine that the first voltage and the second voltage satisfy a preset condition including the first voltage being greater than the second voltage, or the first voltage being less than the second voltage, to open the break switch; and controlling the switching state of the first switch group and/or the second switch group.

In some embodiments, the first switch group includes a first switch and a second switch, the second switch group includes a third switch and a fourth switch, and the determining module 320 may further include:

A fourth determination submodule configured to determine that the first voltage and the second voltage do not meet a preset condition and close the disconnect switch; closing the first switch and the fourth switch respectively, and opening the second switch and the third switch respectively;

The control module 330 may include:

And a fourth control sub-module configured to control the target dc converter to draw power from the first battery pack and the second battery pack.

The embodiment of the disclosure can simply and effectively realize balanced control of the battery in the power supply circuit by introducing the first switch group and the second switch group, wherein the power supply circuit can comprise the first battery group, the second battery group, the first switch group, the second switch group and the target direct current converter, specifically, the first voltage of the first battery group and the second voltage of the second battery group are obtained, on the basis, the first voltage and the second voltage are determined to meet the preset conditions, the on-off state of the first switch group and/or the second switch group is controlled, and the target direct current converter is controlled to take power from the first battery group and/or the second battery group in the on-off state, wherein the target direct current converter is used for supplying power when a vehicle is in a dormant state, so that the discharging requirement of the battery can be reduced while the balanced cost of the battery groups is reduced.

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

The present disclosure also provides a power supply circuit, which may be illustrated in fig. 2, and which may include a first battery pack VCC1, a second battery pack VCC2, a first switch group 110, a second switch group 120, a target dc converter DCC1, and a controller 130, as illustrated in fig. 2.

Wherein, a first end of the first switch group 110 may be connected to the first battery group VCC1, and a second end of the first switch group 120 is connected to the target dc converter DCDC; a first terminal of the second switch group 120 may be connected to the second battery group VCC2, and a second terminal of the second switch group 120 may be connected to the target direct current converter DCDC.

The controller 130 may be connected to the first battery VCC1, the second battery VCC2, the first switch group 110 and the second switch group 120, respectively, and the controller 130 is configured to control a switching state of the first switch group 110 and/or the second switch group 120 when a first voltage of the first battery VCC1 and a second voltage of the second battery VCC2 meet preset conditions, and to control the target dc converter DCDC to draw power from the first battery VCC1 and/or the second battery VCC2 in the switching state.

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

Fig. 9 is a block diagram of a vehicle 600, according to an exemplary embodiment. For example, vehicle 600 may be a hybrid vehicle, but may also be a non-hybrid vehicle, an electric vehicle, a fuel cell vehicle, or other type of vehicle. The vehicle 600 may be an autonomous vehicle, a semi-autonomous vehicle, or a non-autonomous vehicle.

Referring to fig. 9, a vehicle 600 may include various subsystems, such as an infotainment system 610, a perception system 620, a decision control system 630, a drive system 640, and a computing platform 650. Wherein the vehicle 600 may also include more or fewer subsystems, and each subsystem may include multiple components. In addition, interconnections between each subsystem and between each component of the vehicle 600 may be achieved by wired or wireless means.

In some embodiments, the infotainment system 610 may include a communication system, an entertainment system, a navigation system, and the like.

The perception system 620 may include several sensors for sensing information of the environment surrounding the vehicle 600. For example, the sensing system 620 may include a global positioning system (which may be a GPS system, a beidou system, or other positioning system), an inertial measurement unit (inertial measurement unit, IMU), a lidar, millimeter wave radar, an ultrasonic radar, and a camera device.

Decision control system 630 may include a computing system, a vehicle controller, a steering system, a throttle, and a braking system.

The drive system 640 may include components that provide powered movement of the vehicle 600. In one embodiment, the drive system 640 may include an engine, an energy source, a transmission, and wheels. The engine may be one or a combination of an internal combustion engine, an electric motor, an air compression engine. The engine is capable of converting energy provided by the energy source into mechanical energy.

Some or all of the functions of the vehicle 600 are controlled by the computing platform 650. The computing platform 650 may include at least one processor 651 and memory 652, the processor 651 may execute instructions 653 stored in the memory 652.

The processor 651 may be any conventional processor, such as a commercially available CPU. The processor may also include, for example, an image processor (Graphic Process Unit, GPU), a field programmable gate array (Field Programmable GATE ARRAY, FPGA), a System On Chip (SOC), an Application SPECIFIC INTEGRATED Circuit (ASIC), or a combination thereof.

The memory 652 may be implemented by any type or combination of volatile or nonvolatile memory devices such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disk.

In addition to instructions 653, memory 652 may store data such as road maps, route information, vehicle location, direction, speed, and the like. The data stored by memory 652 may be used by computing platform 650.

In an embodiment of the present disclosure, the processor 651 may execute the instructions 653 to complete all or part of the steps of the control method of the power supply circuit described above.

In another exemplary embodiment, a computer program product is also provided, which comprises a computer program executable by a programmable apparatus, the computer program having code portions for performing the above-mentioned control method of a power supply circuit when being executed by the programmable apparatus.

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

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

Claims

1. A control method of a power supply circuit, wherein the power supply circuit includes a first battery pack, a second battery pack, a first switch group, a second switch group, and a target dc converter, the method comprising:

2. The method according to claim 1, wherein the determining that the first voltage and the second voltage satisfy a preset condition, controlling a switching state of the first switch group and/or the second switch group, includes:

3. The method according to claim 1, wherein the determining that the first voltage and the second voltage satisfy a preset condition controls a switching state of the first switch group and/or the second switch group, further comprising:

4. The method according to claim 1, wherein the determining that the first voltage and the second voltage satisfy a preset condition controls a switching state of the first switch group and/or the second switch group, further comprising:

5. The method of controlling a power supply circuit according to claim 1, wherein the power supply circuit further comprises a cut-off switch;

6. The method of controlling a power supply circuit according to claim 5, wherein the first switch group includes a first switch and a second switch, the second switch group includes a third switch and a fourth switch, the method further comprising:

7. A control device for a power supply circuit, the power supply circuit comprising a first battery pack, a second battery pack, a first switch pack, a second switch pack, and a target dc converter, the device comprising:

8. The power supply circuit is characterized by comprising a first battery pack, a second battery pack, a first switch group, a second switch group, a target direct current converter and a controller;

9. A vehicle, characterized by comprising:

A processor;

a memory for storing processor-executable instructions;

wherein the processor is configured to:

10. A computer readable storage medium having stored thereon computer program instructions, which when executed by a processor, implement the steps of the method of any of claims 1 to 6.

11. A computer program product comprising computer programs/instructions which, when executed by a processor, implement the steps of the method of any of claims 1 to 6.