Control method of vehicle power supply system, storage medium, and electronic device

Abstract

The application discloses a control method of a vehicle power supply system, and the vehicle power supply system integrates a low-voltage battery module and a high-voltage battery module into a same battery pack, wherein the low-voltage battery module directly supplies power to a low-voltage part of the whole vehicle, and the battery has high efficiency; a bidirectional DCDC converter is arranged between the low-voltage battery module and the high-voltage battery module; and the working mode of the low-voltage battery module, the high-voltage battery module and the DCDC converter is controlled according to the size relationship between the current working condition of the vehicle and the real-time low-voltage SOC and the real-time high-voltage SOC, so that the real-time low-voltage SOC tends to the real-time high-voltage SOC, the low-voltage battery module can contribute to increasing the endurance of the vehicle, the life of the low-voltage battery module is prolonged, and the same life as the high-voltage battery module can be realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicle power supply system, and in particular to a control method of vehicle power supply system, a storage medium and an electronic device. BACKGROUND

[0002] The traditional 12V automobile power supply system is supplied by a single battery pack, and an independent detection and management system needs to be arranged for the 12V battery pack, which has a high system cost. The current mainstream scheme is that the 12V battery pack is a lead-acid battery or a lithium iron phosphate battery. The lead-acid battery has the disadvantages of short service life, high cost and low efficiency. The lithium iron phosphate battery has the disadvantages of high cost, low efficiency and low safety. Moreover, most of the working conditions are supplied by the high-voltage battery through DCDC conversion to the low-voltage system, and the 12V battery directly supplies power to the low-voltage system in few working conditions, which results in low battery efficiency. SUMMARY

[0003] The present application aims to overcome the disadvantages of high cost and low efficiency of the 12V power supply system in the prior art, and provides a control method of vehicle power supply system, a storage medium and an electronic device, which integrates low-voltage cells into high-voltage cells to reduce cost and improve efficiency.

[0004] The technical scheme of the present application provides a control method of vehicle power supply system, the vehicle power supply system comprising a battery pack provided with a low-voltage cell module and a high-voltage cell module, a DCDC converter being connected between the low-voltage cell module and the high-voltage cell module, the low-voltage cell module being used for supplying power to the whole vehicle low-voltage system and charging the high-voltage cell module through the DCDC converter, the high-voltage cell module being used for supplying power to the whole vehicle high-voltage system and charging the low-voltage cell module through the DCDC converter or supplying power to the whole vehicle low-voltage system; the control method comprising:

[0005] obtaining the current working condition of the vehicle, the real-time low-voltage SOC of the low-voltage cell module and the real-time high-voltage SOC of the high-voltage cell module;

[0006] controlling the working mode of the low-voltage cell module, the high-voltage cell module and the DCDC converter according to the current working condition of the vehicle and the size relationship between the real-time low-voltage SOC and the real-time high-voltage SOC, so that the real-time low-voltage SOC tends to the real-time high-voltage SOC.

[0007] Further, the current working condition of the vehicle includes the parking working condition, and the controlling of the working mode of the low-voltage cell module, the high-voltage cell module and the DCDC converter according to the current working condition of the vehicle and the size relationship between the real-time low-voltage SOC and the real-time high-voltage SOC specifically comprises:

[0008] when the current working condition of the vehicle is the parking working condition:

[0009] In response to a vehicle start command, the low-voltage battery module is controlled to supply low-voltage power to the vehicle to start the vehicle.

[0010] The operating modes of the low-voltage battery module, the high-voltage battery module, and the DC-DC converter are controlled based on the relationship between the real-time low-voltage SOC and the real-time high-voltage SOC.

[0011] Furthermore, controlling the operating modes of the low-voltage battery module, the high-voltage battery module, and the DC-DC converter based on the relationship between the real-time low-voltage SOC and the real-time high-voltage SOC specifically includes:

[0012] If the real-time low-voltage SOC is greater than the real-time high-voltage SOC and the SOC difference is greater than the difference threshold, then the low-voltage battery module is controlled to discharge to supply low-voltage power to the whole vehicle, and the DC-DC converter is controlled to output inverter power so that the low-voltage battery module charges the high-voltage battery module.

[0013] If the real-time low-voltage SOC is greater than the real-time high-voltage SOC and the SOC difference is less than or equal to the difference threshold, then the low-voltage battery module is controlled to discharge to supply low-voltage power to the vehicle, and the DC-DC converter and the high-voltage battery module are controlled to not work.

[0014] If the real-time low-voltage SOC is less than the real-time high-voltage SOC, then the DC-DC converter is controlled to output in the positive direction so that the high-voltage battery module charges the low-voltage battery module and supplies low-voltage power to the vehicle.

[0015] Furthermore, the current vehicle operating condition includes the driving condition, and the step of controlling the operating modes of the low-voltage battery module, the high-voltage battery module, and the DC-DC converter based on the current vehicle operating condition and the relationship between the real-time low-voltage SOC and the real-time high-voltage SOC specifically includes:

[0016] When the vehicle is currently in a driving state:

[0017] If the real-time low-voltage SOC is equal to the real-time high-voltage SOC, then the low-voltage battery module and the high-voltage battery module are controlled to discharge at the same rate, and the DC-DC converter is controlled to output in the forward direction so that the high-voltage battery module and the low-voltage battery module jointly supply low-voltage power to the whole vehicle.

[0018] Furthermore, the step of controlling the operating modes of the low-voltage battery module, the high-voltage battery module, and the DC-DC converter based on the current vehicle operating conditions and the relationship between the real-time low-voltage SOC and the real-time high-voltage SOC also includes:

[0019] When the vehicle is currently in a driving state:

[0020] If the real-time low-voltage SOC is greater than the real-time high-voltage SOC, the low-voltage battery cell module is controlled to discharge according to the vehicle low-voltage load power to supply power to the vehicle low-voltage, the high-voltage battery cell module is controlled to discharge according to the vehicle high-voltage load power to supply power to the vehicle high-voltage, and the DCDC converter is controlled to be inoperative.

[0021] Further, the control of the working modes of the low-voltage battery cell module, the high-voltage battery cell module and the DCDC converter according to the vehicle current working condition and the size relationship between the real-time low-voltage SOC and the real-time high-voltage SOC further comprises:

[0022] When the vehicle current working condition is the running working condition:

[0023] If the real-time low-voltage SOC is less than the real-time high-voltage SOC and the vehicle low-voltage load power is greater than or equal to the maximum power of the DCDC converter, the DCDC converter is controlled to output in forward direction at the maximum power to make the high-voltage battery cell module supply power to the vehicle low-voltage, and the low-voltage battery cell module is controlled to discharge to supply power to the vehicle low-voltage;

[0024] If the real-time low-voltage SOC is less than the real-time high-voltage SOC and the vehicle low-voltage load power is less than the maximum power of the DCDC converter, the DCDC converter is controlled to output in forward direction at the maximum power to make the high-voltage battery cell module supply power to the vehicle low-voltage and charge the low-voltage battery cell module at the same time.

[0025] Further, the vehicle current working condition comprises a charging working condition, and the control of the working modes of the low-voltage battery cell module, the high-voltage battery cell module and the DCDC converter according to the vehicle current working condition and the size relationship between the real-time low-voltage SOC and the real-time high-voltage SOC specifically comprises:

[0026] When the vehicle current working condition is the charging working condition:

[0027] If the real-time low-voltage SOC is equal to the real-time high-voltage SOC, the DCDC converter is controlled to output in forward direction, and the low-voltage battery cell module and the high-voltage battery cell module are controlled to charge at the same rate.

[0028] Further, the vehicle current working condition comprises a charging working condition, and the control of the working modes of the low-voltage battery cell module, the high-voltage battery cell module and the DCDC converter according to the vehicle current working condition and the size relationship between the real-time low-voltage SOC and the real-time high-voltage SOC specifically comprises:

[0029] When the vehicle current working condition is the charging working condition:

[0030] If the real-time low-voltage SOC is greater than the real-time high-voltage SOC, the DCDC converter is controlled to be in reverse output, and the low-voltage cell module is controlled to charge the high-voltage cell module.

[0031] Further, the current working condition of the vehicle includes a charging working condition, and the working mode of the low-voltage cell module, the high-voltage cell module and the DCDC converter is controlled according to the current working condition of the vehicle and the size relationship between the real-time low-voltage SOC and the real-time high-voltage SOC, specifically including:

[0032] When the current working condition of the vehicle is the charging working condition:

[0033] If the real-time low-voltage SOC is less than the real-time high-voltage SOC, the DCDC converter is controlled to be in maximum power forward output, and the high-voltage cell module is controlled to charge the low-voltage cell module.

[0034] The technical solution of the present application also provides a storage medium, which stores computer instructions, and when a computer executes the computer instructions, the control method of the vehicle power supply system is executed.

[0035] The technical solution of the present application also provides an electronic device, which includes at least one processor; and,

[0036] a memory in communication connection with the at least one processor; wherein,

[0037] The memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to execute the control method of the vehicle power supply system.

[0038] After the above technical solution is adopted, the following beneficial effects are achieved:

[0039] In the present application, the low-voltage cell module and the high-voltage cell module are integrated into the same battery pack, the low-voltage cell module directly supplies power to the low-voltage parts of the vehicle, the battery efficiency is high, and the DCDC converter is arranged between the low-voltage cell module and the high-voltage cell module, the working mode of the low-voltage cell module, the high-voltage cell module and the DCDC converter is controlled according to the size relationship between the current working condition of the vehicle and the real-time low-voltage SOC and the real-time high-voltage SOC, so that the real-time low-voltage SOC tends to the real-time high-voltage SOC, the low-voltage cell module can contribute to increasing the vehicle endurance, the life of the low-voltage cell module is prolonged, and the same life as the high-voltage cell can be achieved. BRIEF DESCRIPTION OF DRAWINGS

[0040] The disclosure of the present application will become more apparent from the following description taken in conjunction with the accompanying drawings. It should be understood that the drawings are for purposes of illustration only and are not intended to limit the scope of the present application. In the drawings:

[0041] Figure 1 is a structural schematic diagram of a vehicle power supply system in an embodiment of the present application;

[0042] Figure 2 is a flow chart of a control method of a vehicle power supply system in an embodiment of the present application;

[0043] Figure 3 is a flow chart of a control method of a vehicle power supply system in an embodiment of the present application when the vehicle is in a parking working condition;

[0044] Figure 4 is a flow chart of a control method of a vehicle power supply system in an embodiment of the present application when the vehicle is in a running working condition;

[0045] Figure 5 is a flow chart of a control method of a vehicle power supply system in an embodiment of the present application when the vehicle is in a charging working condition;

[0046] Figure 6 is a hardware structural schematic diagram of an electronic device in an embodiment of the present application. DETAILED DESCRIPTION

[0047] The specific embodiments of the present application will be further described in conjunction with the accompanying drawings.

[0048] It is easy to understand that, according to the technical solution of the present application, a person skilled in the art can replace various structural modes and implementation modes without changing the essential spirit of the present application. Therefore, the following specific embodiments and the accompanying drawings are only exemplary descriptions of the technical solution of the present application, and should not be regarded as the whole or as a limitation or restriction on the technical solution of the application.

[0049] In the present specification, the orientation terms such as up, down, left, right, front, back, front, back, top, bottom, etc. mentioned or possibly mentioned are defined with respect to the structure shown in the drawings, and they are relative concepts, so they can be changed accordingly according to different positions, different use states. Therefore, these or other orientation terms should not be interpreted as restrictive terms. In addition, the terms "first", "second", "third" are only for descriptive purposes, and should not be understood as indicating or implying relative importance.

[0050] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connected" should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or integrally connected; can be mechanically connected, or can be electrically connected; can be directly connected, or indirectly connected through an intermediate medium, or can be the communication inside two components. For those skilled in the art, the above belongs to the specific meaning in the present application can be understood according to the specific circumstances.

[0051] The control method of the vehicle power supply system of the embodiment of the present application is as shown in Figure 1 The vehicle power supply system includes a battery pack provided with a low-voltage cell module 01 and a high-voltage cell module 02, and a DCDC converter 03 connected between the low-voltage cell module 01 and the high-voltage cell module 02. The low-voltage cell module 01 is used to supply power to the low-voltage parts 04 of the whole vehicle and charge the high-voltage cell module 02 through the DCDC converter 03. The high-voltage cell module 02 is used to supply power to the high-voltage parts 05 of the whole vehicle and charge the low-voltage cell module 01 through the DCDC converter 03 or supply power to the low-voltage parts 04 of the whole vehicle.

[0052] The vehicle power supply system of the embodiment of the present application integrates the low-voltage cell module 01 and the high-voltage cell module 02 in the same battery pack, which can share a set of battery management system, saving cost and having high safety. The low-voltage cell module 01 can directly supply power to the low-voltage parts 04 of the whole vehicle, and the battery efficiency is high. The DCDC converter 03 is arranged between the low-voltage cell module 01 and the high-voltage cell module 02. The low-voltage cell module 01 can also charge the high-voltage cell module 01 through the DCDC converter 03. The low-voltage cell module 01 can supply power to the low-voltage parts 04 of the whole vehicle and charge the high-voltage cell module 01 at the same time. The high-voltage cell module 02 directly supplies power to the high-voltage parts 05 of the whole vehicle, and can also charge the low-voltage cell module 01 through the DCDC converter 03 or supply power to the low-voltage parts 04 of the whole vehicle. The high-voltage cell module 02 can simultaneously execute two or three of the following working conditions: supplying power to the high-voltage parts 05 of the whole vehicle, charging the low-voltage cell module 01, and supplying power to the low-voltage parts 04 of the whole vehicle.

[0053] As shown in Figure 2 The control method of the vehicle power supply system includes:

[0054] Step S201: acquiring the current working condition of the vehicle, the real-time low-voltage SOC of the low-voltage cell module, and the real-time high-voltage SOC of the high-voltage cell module;

[0055] Step S202: controlling the working mode of the low-voltage cell module, the high-voltage cell module, and the DCDC converter according to the current working condition of the vehicle and the size relationship between the real-time low-voltage SOC and the real-time high-voltage SOC, so that the real-time low-voltage SOC tends to the real-time high-voltage SOC.

[0056] The current working condition of the vehicle can include parking, walking and charging, and the target of the control method of the embodiments of the present application is to make the real-time low-voltage SOC and the real-time high-voltage SOC tend to be equal. When the vehicle is in different working conditions, the working modes of the low-voltage cell module and the high-voltage cell module have different influences on the SOC. To this end, the embodiments of the present application obtain the current working condition of the vehicle, the real-time low-voltage SOC and the real-time high-voltage SOC, and control the working modes of the low-voltage cell module, the high-voltage cell module and the DCDC converter according to the current working condition of the vehicle and the size relationship between the real-time low-voltage SOC and the real-time high-voltage SOC, so as to make the real-time low-voltage SOC tend to the real-time high-voltage SOC. The real-time low-voltage SOC and the real-time high-voltage SOC are kept in balance, which can increase the contribution of the low-voltage cell module to the vehicle's endurance and prolong the life of the low-voltage cell module, and the same life as the high-voltage cell can be realized.

[0057] In one of the embodiments, when the current working condition of the vehicle is the parking working condition, the working modes of the low-voltage cell module, the high-voltage cell module and the DCDC converter are controlled according to the current working condition of the vehicle and the size relationship between the real-time low-voltage SOC and the real-time high-voltage SOC, as shown in FIG. 3, which specifically includes: Figure 3

[0058] Step S301: In response to a vehicle start instruction, the low-voltage cell module is controlled to supply power to the low-voltage parts of the vehicle to start the vehicle.

[0059] When the vehicle is in the parking working condition, the low-voltage cell module needs to supply power to the low-voltage parts of the vehicle to start the vehicle, so when the vehicle is in the parking working condition, the low-voltage cell module is controlled to supply power to the low-voltage parts of the vehicle to start the vehicle after receiving the vehicle start instruction.

[0060] Step S302: The working modes of the low-voltage cell module, the high-voltage cell module and the DCDC converter are controlled according to the size relationship between the real-time low-voltage SOC and the real-time high-voltage SOC.

[0061] After the vehicle is started, the high-voltage parts of the vehicle are in an inactive state, and the working modes of the low-voltage cell module, the high-voltage cell module and the DCDC converter are controlled according to the size relationship between the real-time low-voltage SOC and the real-time high-voltage SOC to adjust the real-time low-voltage SOC to tend to the real-time high-voltage SOC, which specifically includes:

[0062] Step S321: If the real-time low-voltage SOC is greater than the real-time high-voltage SOC and the SOC difference is greater than the difference threshold, the low-voltage cell module is controlled to discharge to supply power to the low-voltage parts of the vehicle, and the DCDC converter is controlled to inverter output to make the low-voltage cell module charge the high-voltage cell module.

[0063] ​When the real-time low-voltage SOC is greater than the real-time high-voltage SOC and the SOC difference is greater than the difference threshold, the real-time low-voltage SOC is much greater than the real-time high-voltage SOC, at this time, it is necessary to reduce the SOC of the low-voltage battery module and / or increase the SOC of the high-voltage battery module, and the low-voltage battery module should supply power to the low-voltage parts of the vehicle, and at the same time, in order to make the SOCs of the low-voltage battery module and the high-voltage battery module tend to be equal as soon as possible, the DCDC converter is controlled to inversely output to convert the low voltage of the low-voltage battery module into high voltage to charge the high-voltage battery module, at this time, the DCDC converter works at maximum power to increase the balancing speed of the SOC.

[0064] Step S322: If the real-time low-voltage SOC is greater than the real-time high-voltage SOC and the SOC difference is less than or equal to the difference threshold, the low-voltage battery module is controlled to discharge to supply power to the low-voltage parts of the vehicle, and the DCDC converter and the high-voltage battery module are not controlled to work.

[0065] When the real-time low-voltage SOC is greater than the real-time high-voltage SOC and the SOC difference is less than or equal to the difference threshold, at this time, it is necessary to reduce the SOC of the low-voltage battery module and / or increase the SOC of the high-voltage battery module, and since the difference between the real-time low-voltage SOC and the real-time high-voltage SOC is not large, the SOC of the low-voltage battery module can be reduced by supplying power to the low-voltage parts of the vehicle to make the SOCs of the two tend to be equal. At this time, the low-voltage battery module is controlled to discharge to supply power to the low-voltage parts of the vehicle, and the DCDC converter and the high-voltage battery module are not controlled to work.

[0066] Step S323: If the real-time low-voltage SOC is less than the real-time high-voltage SOC, the DCDC converter is controlled to forward output to make the high-voltage battery module charge the low-voltage battery module and supply power to the low-voltage parts of the vehicle.

[0067] When the real-time low-voltage SOC is less than the real-time high-voltage SOC, at this time, it is necessary to increase the SOC of the low-voltage battery module and / or reduce the SOC of the high-voltage battery module, and the consumption of the power of the low-voltage battery module should be reduced as much as possible, at this time, the DCDC converter is controlled to forward output to make the high-voltage battery module charge the low-voltage battery module and supply power to the low-voltage parts of the vehicle, and the DCDC converter works at maximum power to reduce the SOC of the high-voltage battery module.

[0068] The embodiment of the application receives a vehicle starting instruction when the vehicle is in the parking working condition, controls the low-voltage battery module to supply power to the low-voltage parts of the vehicle to start the vehicle, and then controls whether the high-voltage battery module or the low-voltage battery module supplies power to the low-voltage parts of the vehicle and whether the high-voltage battery module and the low-voltage battery module perform charging and discharging according to the size of the real-time low-voltage SOC and the real-time high-voltage SOC and the difference threshold, so that the SOCs of the two tend to be equal.

[0069] In one of the embodiments, when the current working condition of the vehicle is the walking working condition, the working modes of the low-voltage cell module, the high-voltage cell module and the DCDC converter are controlled according to the current working condition of the vehicle and the size relationship between the real-time low-voltage SOC and the real-time high-voltage SOC, as shown in the following table, which specifically includes: Figure 4

[0070] Step S401: If the real-time low-voltage SOC is equal to the real-time high-voltage SOC, the low-voltage cell module and the high-voltage cell module are controlled to discharge at the same rate, and the DCDC converter is controlled to output in the forward direction to make the high-voltage cell module and the low-voltage cell module supply power to the low-voltage of the vehicle together.

[0071] When the vehicle is in the walking working condition, the low-voltage parts of the vehicle and the high-voltage parts of the vehicle need to be powered, and when the real-time low-voltage SOC is equal to the real-time high-voltage SOC, it is only necessary to keep the low-voltage cell module and the high-voltage cell module discharging at the same rate to maintain the SOC of the two equal. However, the high-voltage demand of the vehicle and the low-voltage demand of the vehicle are not the same, and therefore the DCDC converter is controlled to output in the forward direction to make the high-voltage cell module and the low-voltage cell module supply power to the low-voltage of the vehicle together, and the high-voltage cell module supplies power to the high-voltage parts of the vehicle. The low-voltage cell module keeps discharging at the same rate as the high-voltage cell module, and if the low-voltage demand of the vehicle is not met, the difference in power is provided by the high-voltage cell module through the DCDC converter, so as to keep the real-time low-voltage SOC equal to the real-time high-voltage SOC.

[0072] Step S402: If the real-time low-voltage SOC is greater than the real-time high-voltage SOC, the low-voltage cell module is controlled to discharge according to the load power of the low-voltage of the vehicle to supply power to the low-voltage of the vehicle, the high-voltage cell module is controlled to discharge according to the load power of the high-voltage of the vehicle to supply power to the high-voltage of the vehicle, and the DCDC converter is controlled to be not working.

[0073] If the real-time low-voltage SOC is greater than the real-time high-voltage SOC, the power of the low-voltage cell module needs to be reduced, and at this time the low-voltage cell module directly supplies power to the low-voltage of the vehicle, and the high-voltage cell module does not participate in the power supply to the low-voltage of the vehicle, i.e. the DCDC converter does not work, so as to consume the power of the low-voltage cell module, thereby making the SOC of the low-voltage cell module and the high-voltage cell module tend to be equal.

[0074] Step S403: If the real-time low-voltage SOC is less than the real-time high-voltage SOC and the load power of the low-voltage of the vehicle is greater than or equal to the maximum power of the DCDC converter, the DCDC converter is controlled to output in the forward direction at the maximum power to make the high-voltage cell module supply power to the low-voltage of the vehicle, and the low-voltage cell module is controlled to discharge to supply power to the low-voltage of the vehicle.

[0075] ​If the real-time low-voltage SOC is less than the real-time high-voltage SOC, the power of the high-voltage battery module needs to be reduced, and the power consumption of the low-voltage battery module needs to be reduced. When the vehicle low-voltage load power is greater than or equal to the maximum power of the DCDC converter, it indicates that the power supplied by the high-voltage battery module through the DCDC converter cannot meet the power demand of the vehicle low-voltage parts, at this time, the DCDC converter needs to be controlled to output at the maximum power in the forward direction to make the high-voltage battery module supply power to the vehicle low-voltage parts, and the low-voltage battery module needs to be controlled to discharge to supply power to the vehicle low-voltage parts to provide the difference in power.

[0076] Step S404: If the real-time low-voltage SOC is less than the real-time high-voltage SOC and the vehicle low-voltage load power is less than the maximum power of the DCDC converter, the DCDC converter is controlled to output at the maximum power in the forward direction to make the high-voltage battery module supply power to the vehicle low-voltage parts and charge the low-voltage battery module at the same time.

[0077] If the real-time low-voltage SOC is less than the real-time high-voltage SOC, the power of the high-voltage battery module needs to be reduced, and the power consumption of the low-voltage battery module needs to be reduced. When the vehicle low-voltage load power is less than the maximum power of the DCDC converter, it indicates that the power supplied by the high-voltage battery module through the DCDC converter has a surplus in addition to meeting the power demand of the vehicle low-voltage parts, at this time, the DCDC converter is controlled to output at the maximum power in the forward direction to make the high-voltage battery module supply power to the vehicle low-voltage parts, and the surplus energy is charged to the low-voltage battery module. At the same time, the SOC of the low-voltage battery module is increased while the SOC of the high-voltage battery module is reduced.

[0078] The embodiment of the present application adjusts the SOC of the high-voltage battery module and the low-voltage battery module dynamically according to the above strategy when the vehicle is in the running working condition, so that the SOC of the high-voltage battery module and the low-voltage battery module tends to be equal.

[0079] In one of the embodiments, when the current working condition of the vehicle is the charging working condition, the working mode of the low-voltage battery module, the high-voltage battery module and the DCDC converter is controlled according to the current working condition of the vehicle and the size relationship between the real-time low-voltage SOC and the real-time high-voltage SOC, as shown in the following table: Figure 5 Specifically, the method comprises the following steps:

[0080] Step S501: If the real-time low-voltage SOC is equal to the real-time high-voltage SOC, the DCDC converter is controlled to output in the forward direction, and the low-voltage battery module and the high-voltage battery module are controlled to charge at the same rate.

[0081] When the vehicle is in the charging working condition, the charging pile only charges the high-voltage battery module, if the real-time low-voltage SOC is equal to the real-time high-voltage SOC, the low-voltage battery module and the high-voltage battery module need to be charged at the same rate, and the low-voltage battery module needs to be charged by inverting the voltage supplied by the charging pile to the high-voltage battery module through the DCDC converter, therefore, the DCDC converter needs to be controlled to output in the forward direction.

[0082] Step S502: If the real-time low-voltage SOC is greater than the real-time high-voltage SOC, control the DCDC converter to inversely output, and control the low-voltage battery module to charge the high-voltage battery module.

[0083] When the real-time low-voltage SOC is greater than the real-time high-voltage SOC, the power of the low-voltage battery module needs to be reduced and the power of the high-voltage battery module needs to be increased. At this time, the DCDC converter is controlled to inversely output, and the low-voltage battery module is controlled to charge the high-voltage battery module. The charging pile and the low-voltage battery module simultaneously charge the high-voltage battery module, so that the powers of the high-voltage battery module and the low-voltage battery module tend to be equal.

[0084] Step S503: If the real-time low-voltage SOC is less than the real-time high-voltage SOC, control the DCDC converter to positively output at maximum power, and control the high-voltage battery module to charge the low-voltage battery module.

[0085] When the real-time low-voltage SOC is less than the real-time high-voltage SOC, the SOC of the low-voltage battery module needs to be increased. At this time, the DCDC converter is controlled to positively output at maximum power, and the low-voltage battery module is charged at maximum power, so that the SOC of the low-voltage battery module rises at the fastest speed and tends to be equal to the SOC of the high-voltage battery module.

[0086] The embodiment of the application adjusts the SOCs of the high-voltage battery module and the low-voltage battery module according to the above strategy when the vehicle is in the charging working condition, so that the SOCs of the high-voltage battery module and the low-voltage battery module tend to be equal.

[0087] The technical solution of the application further provides a storage medium, which stores computer instructions. When a computer executes the computer instructions, the computer instructions are used to execute the control method of the vehicle power supply system in any one of the foregoing embodiments.

[0088] Figure 6 An electronic device of the application is shown, which comprises:

[0089] at least one processor 601; and

[0090] a memory 602 connected in communication with the at least one processor 601; wherein

[0091] The memory 602 stores instructions executable by the at least one processor 601, and the instructions are executed by the at least one processor 601 to enable the at least one processor 601 to perform all steps of the control method of the vehicle power supply system in any one of the foregoing method embodiments.

[0092] Figure 6 Taking the processor 602 as an example:

[0093] The electronic device can further include an input device 603 and an output device 604.

[0094] The processor 601, the memory 602, the input device 603, and the output device 604 can be connected by a bus or other means, and are connected by a bus in the figure.

[0095] The memory 602, as a non-volatile computer readable storage medium, can be used to store non-volatile software programs, non-volatile computer executable programs, and modules, such as program instructions / modules corresponding to the control method of the vehicle power supply system in the embodiments of the present application, for example, Figures 2-5 The method flowchart shown. The processor 601 executes various function applications and data processing by running the non-volatile software programs, instructions and modules stored in the memory 602, that is, implements the control method of the vehicle power supply system in the above embodiments.

[0096] The memory 602 can include a program storage area and a data storage area, wherein the program storage area can store an operating system and application programs required by at least one function; the data storage area can store data created according to the use of the control method of the vehicle power supply system, etc. In addition, the memory 602 can include a high-speed random access memory, and can also include a non-volatile memory, such as at least one magnetic disk storage device, a flash memory device, or other non-volatile solid-state storage device. In some embodiments, the memory 602 can optionally include a memory remotely arranged with respect to the processor 601, which can be connected to the device executing the control method of the vehicle power supply system through a network. Examples of the above network include but are not limited to the Internet, an intranet, a local area network, a mobile communication network, and a combination thereof.

[0097] The input device 603 can receive input user clicks and generate signal inputs related to user settings and function control of the control method of the vehicle power supply system. The output device 604 can include a display device such as a display screen.

[0098] When the one or more modules are stored in the memory 602, when executed by the one or more processors 601, the control method of the vehicle power supply system in any of the above method embodiments is executed.

[0099] The above only describes the principles and preferred embodiments of the present application. It should be noted that for those skilled in the art, the technical solutions disclosed in different embodiments can be appropriately combined to obtain embodiments, which are also included in the technical scope of the present application, and on the basis of the principles of the present application, several other variations can also be made, which should be regarded as the protection scope of the present application.

Claims

1. A control method of a vehicle power supply system, characterized by, The vehicle power supply system comprises a battery pack provided with a low-voltage cell module and a high-voltage cell module, a DCDC converter is connected between the low-voltage cell module and the high-voltage cell module, the low-voltage cell module is used for supplying power to the whole vehicle at low voltage and charging the high-voltage cell module through the DCDC converter, and the high-voltage cell module is used for supplying power to the whole vehicle at high voltage and charging the low-voltage cell module through the DCDC converter or supplying power to the whole vehicle at low voltage; the control method comprises: obtaining the current working condition of the vehicle, the real-time low-voltage SOC of the low-voltage cell module and the real-time high-voltage SOC of the high-voltage cell module; controlling the working modes of the low-voltage cell module, the high-voltage cell module and the DCDC converter according to the current working condition of the vehicle and the size relationship between the real-time low-voltage SOC and the real-time high-voltage SOC, so that the real-time low-voltage SOC tends to the real-time high-voltage SOC, specifically comprising: when the current working condition of the vehicle is the parking working condition: in response to a vehicle starting instruction, controlling the low-voltage cell module to supply power to the whole vehicle at low voltage to start the vehicle; controlling the working modes of the low-voltage cell module, the high-voltage cell module and the DCDC converter according to the size relationship between the real-time low-voltage SOC and the real-time high-voltage SOC, specifically comprising: if the real-time low-voltage SOC is greater than the real-time high-voltage SOC and the SOC difference value is greater than the difference threshold value, controlling the low-voltage cell module to discharge to supply power to the whole vehicle at low voltage, and controlling the DCDC converter to output in reverse to make the low-voltage cell module charge the high-voltage cell module; if the real-time low-voltage SOC is greater than the real-time high-voltage SOC and the SOC difference value is less than or equal to the difference threshold value, controlling the low-voltage cell module to discharge to supply power to the whole vehicle at low voltage, and controlling the DCDC converter and the high-voltage cell module to be inactive; if the real-time low-voltage SOC is less than the real-time high-voltage SOC, controlling the DCDC converter to output in forward to make the high-voltage cell module charge the low-voltage cell module and supply power to the whole vehicle at low voltage.

2. The control method of the vehicle power supply system according to claim 1, characterized by The current working condition of the vehicle comprises the walking working condition, and the control of the working modes of the low-voltage cell module, the high-voltage cell module and the DCDC converter according to the current working condition of the vehicle and the size relationship between the real-time low-voltage SOC and the real-time high-voltage SOC, specifically comprising: when the current working condition of the vehicle is the walking working condition: if the real-time low-voltage SOC is equal to the real-time high-voltage SOC, controlling the low-voltage cell module and the high-voltage cell module to discharge at the same rate, and controlling the DCDC converter to output in forward to make the high-voltage cell module and the low-voltage cell module jointly supply power to the whole vehicle at low voltage.

3. The control method of the vehicle power supply system according to claim 2, characterized by The control of the working modes of the low-voltage cell module, the high-voltage cell module and the DCDC converter according to the current working condition of the vehicle and the size relationship between the real-time low-voltage SOC and the real-time high-voltage SOC further comprises: when the current working condition of the vehicle is the walking working condition: If the real-time low-voltage SOC is greater than the real-time high-voltage SOC, the low-voltage cell module is controlled to discharge according to the whole vehicle low-voltage load power to supply power to the whole vehicle low-voltage, the high-voltage cell module is controlled to discharge according to the whole vehicle high-voltage load power to supply power to the whole vehicle high-voltage, and the DCDC converter is controlled to be inoperative.

4. The control method of the vehicle power supply system according to claim 3, characterized by The control of the working mode of the low-voltage cell module, the high-voltage cell module and the DCDC converter according to the current working condition of the vehicle and the size relationship between the real-time low-voltage SOC and the real-time high-voltage SOC further comprises: When the current working condition of the vehicle is the walking working condition: If the real-time low-voltage SOC is less than the real-time high-voltage SOC and the whole vehicle low-voltage load power is greater than or equal to the maximum power of the DCDC converter, the DCDC converter is controlled to output in forward direction at the maximum power to make the high-voltage cell module supply power to the whole vehicle low-voltage, and the low-voltage cell module is controlled to discharge to supply power to the whole vehicle low-voltage; If the real-time low-voltage SOC is less than the real-time high-voltage SOC and the whole vehicle low-voltage load power is less than the maximum power of the DCDC converter, the DCDC converter is controlled to output in forward direction at the maximum power to make the high-voltage cell module supply power to the whole vehicle low-voltage and charge the low-voltage cell module at the same time.

5. The control method of the vehicle power supply system according to claim 1, characterized by The current working condition of the vehicle comprises the charging working condition, and the control of the working mode of the low-voltage cell module, the high-voltage cell module and the DCDC converter according to the current working condition of the vehicle and the size relationship between the real-time low-voltage SOC and the real-time high-voltage SOC specifically comprises: When the current working condition of the vehicle is the charging working condition: If the real-time low-voltage SOC is equal to the real-time high-voltage SOC, the DCDC converter is controlled to output in forward direction, and the low-voltage cell module and the high-voltage cell module are controlled to charge at the same rate.

6. The control method of the vehicle power supply system according to claim 5, characterized by The current working condition of the vehicle comprises the charging working condition, and the control of the working mode of the low-voltage cell module, the high-voltage cell module and the DCDC converter according to the current working condition of the vehicle and the size relationship between the real-time low-voltage SOC and the real-time high-voltage SOC specifically comprises: When the current working condition of the vehicle is the charging working condition: If the real-time low-voltage SOC is greater than the real-time high-voltage SOC, the DCDC converter is controlled to output in reverse direction, and the low-voltage cell module is controlled to charge the high-voltage cell module.

7. The control method of the vehicle power supply system according to claim 6, characterized by The current working condition of the vehicle comprises the charging working condition, and the control of the working mode of the low-voltage cell module, the high-voltage cell module and the DCDC converter according to the current working condition of the vehicle and the size relationship between the real-time low-voltage SOC and the real-time high-voltage SOC specifically comprises: When the current working condition of the vehicle is the charging working condition: If the real-time low-voltage SOC is less than the real-time high-voltage SOC, the DCDC converter is controlled to output in forward direction at the maximum power, and the high-voltage cell module is controlled to charge the low-voltage cell module.

8. A storage medium, characterized by The storage medium stores computer instructions, when the computer executes the computer instructions, the computer instructions are used to execute the control method of the vehicle power supply system as claimed in any one of claims 1-7.

9. An electronic device, comprising: comprise at least one processor; and a memory in communication with the at least one processor; wherein the memory has stored instructions executable by the at least one processor, the instructions being executable by the at least one processor to enable the at least one processor to perform the method of controlling a power supply system of a vehicle as claimed in any one of claims 1-7.

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