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

Abstract

The invention discloses a control method of a vehicle power supply system, the vehicle power supply system integrates a low-voltage battery cell module and a high-voltage battery cell module into the same battery pack, the low-voltage battery cell module directly supplies power to low-voltage components of a whole vehicle, the battery efficiency is high, and the reliability is high. A bidirectional DCDC converter is arranged between a low-voltage battery cell module and a high-voltage battery cell module, and the working modes of the low-voltage battery cell module, the high-voltage battery cell module and the DCDC converter are controlled according to the current working condition of a vehicle and the size relation 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. The low-voltage battery cell module can contribute to increase the endurance of the vehicle, the service life of the low-voltage battery cell module is prolonged, and the service life of the low-voltage battery cell module is equal to that of a high-voltage battery cell.

Description

Technical Field

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

[0002] The traditional 12V automotive power supply system is supplied by a separate 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 12V battery pack is a lead-acid battery or a lithium iron phosphate battery. Lead-acid batteries have disadvantages such as short life, high cost, and low efficiency, while lithium iron phosphate batteries have disadvantages such as high cost, low efficiency, and low safety. In addition, in most working conditions, the high-voltage battery supplies power to the low-voltage system through DCDC conversion. In very rare working conditions, the 12V battery directly supplies power to the low-voltage system, resulting in low battery efficiency. Summary of the invention

[0003] The purpose of this application is to overcome the shortcomings of high cost and low efficiency of the 12V power supply system in the prior art, and to provide a control method, storage medium and electronic device for a vehicle power supply system that integrates low-voltage batteries into high-voltage batteries to reduce costs and improve efficiency.

[0004] The technical solution of the present application provides a control method for a vehicle power supply system, wherein the vehicle power supply system includes a battery pack provided with a low-voltage battery cell module and a high-voltage battery cell module, wherein a DCDC converter is connected between the low-voltage battery cell module and the high-voltage battery cell module, wherein the low-voltage battery cell module is used to supply low-voltage power to the entire vehicle and to charge the high-voltage battery cell module through the DCDC converter, and the high-voltage battery cell module is used to supply high-voltage power to the entire vehicle and to charge the low-voltage battery cell module through the DCDC converter or to supply low-voltage power to the entire vehicle; the control method includes:

[0005] Acquire the current operating condition of the vehicle, the real-time low-voltage SOC of the low-voltage battery module, and the real-time high-voltage SOC of the high-voltage battery module;

[0006] The operating modes of the low-voltage battery cell module, the high-voltage battery cell module and the DCDC converter are controlled according to the current operating conditions of the vehicle and the 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] Furthermore, the current operating condition of the vehicle includes a parking condition, and the operating modes of the low-voltage battery module, the high-voltage battery module, and the DCDC converter are controlled according to the current operating condition of the vehicle and the magnitude relationship between the real-time low-voltage SOC and the real-time high-voltage SOC, specifically including:

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

[0009] In response to a vehicle start command, controlling the low-voltage battery module to supply low-voltage power to the entire vehicle to start the vehicle;

[0010] The operating modes of the low-voltage battery cell module, the high-voltage battery cell module and the DCDC converter are controlled according to the magnitude relationship between the real-time low-voltage SOC and the real-time high-voltage SOC.

[0011] Further, controlling the working modes of the low-voltage battery module, the high-voltage battery module and the DCDC converter according to the magnitude 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, the low-voltage battery module is controlled to discharge to supply low-voltage power to the entire vehicle, and the DCDC converter is controlled to invert the output 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, the low-voltage battery module is controlled to discharge to supply low-voltage power to the entire vehicle, and the DCDC converter and the high-voltage battery module are controlled not to work;

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

[0015] Furthermore, the current operating condition of the vehicle includes a running operating condition, and the operating modes of the low-voltage battery module, the high-voltage battery module and the DCDC converter are controlled according to the current operating condition of the vehicle and the magnitude relationship between the real-time low-voltage SOC and the real-time high-voltage SOC, specifically including:

[0016] When the current working condition of the vehicle is the running condition:

[0017] 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 are controlled to discharge at the same rate, and the DCDC converter is controlled to output in a forward direction so that the high-voltage battery module and the low-voltage battery module jointly supply low-voltage power to the entire vehicle.

[0018] Furthermore, the control of the working modes of the low-voltage battery module, the high-voltage battery module and the DCDC converter according to the current working condition of the vehicle and the magnitude relationship between the real-time low-voltage SOC and the real-time high-voltage SOC also includes:

[0019] When the current working condition of the vehicle is the running condition:

[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 low-voltage load power of the whole vehicle to supply low voltage to the whole vehicle, the high-voltage battery cell module is controlled to discharge according to the high-voltage load power of the whole vehicle to supply high voltage to the whole vehicle, and the DCDC converter is controlled not to work.

[0021] Furthermore, the control of the working modes of the low-voltage battery module, the high-voltage battery module and the DCDC converter according to the current working condition of the vehicle and the magnitude relationship between the real-time low-voltage SOC and the real-time high-voltage SOC also includes:

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

[0023] If the real-time low-voltage SOC is less than the real-time high-voltage SOC and the low-voltage load power of the whole vehicle is greater than or equal to the maximum power of the DCDC converter, the DCDC converter is controlled to output in a forward direction with maximum power so that the high-voltage battery module supplies low-voltage power to the whole vehicle, and the low-voltage battery module is controlled to discharge so as to supply low-voltage power to the whole vehicle;

[0024] If the real-time low-voltage SOC is less than the real-time high-voltage SOC and the low-voltage load power of the whole vehicle is less than the maximum power of the DCDC converter, the DCDC converter is controlled to output in the maximum forward power so that the high-voltage battery module can simultaneously supply low-voltage power to the whole vehicle and charge the low-voltage battery module.

[0025] Furthermore, the current operating condition of the vehicle includes a charging condition, and the operating modes of the low-voltage battery module, the high-voltage battery module, and the DCDC converter are controlled according to the current operating condition of the vehicle and the magnitude relationship between the real-time low-voltage SOC and the real-time high-voltage SOC, specifically including:

[0026] When the current working condition of the vehicle is the charging 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 a 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] Furthermore, the current operating condition of the vehicle includes a charging condition, and the operating modes of the low-voltage battery module, the high-voltage battery module, and the DCDC converter are controlled according to the current operating condition of the vehicle and the magnitude relationship between the real-time low-voltage SOC and the real-time high-voltage SOC, specifically including:

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

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

[0031] Furthermore, the current operating condition of the vehicle includes a charging condition, and the operating modes of the low-voltage battery module, the high-voltage battery module, and the DCDC converter are controlled according to the current operating condition of the vehicle and the magnitude 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 condition:

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

[0034] The technical solution of the present application also provides a storage medium, which stores computer instructions. When a computer executes the computer instructions, it is used to execute the control method of the vehicle power supply system as described above.

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

[0036] a memory communicatively connected to the at least one processor; wherein,

[0037] The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the control method of the vehicle power supply system as described above.

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

[0039] The present application integrates a low-voltage battery cell module and a high-voltage battery cell module into the same battery pack, wherein the low-voltage battery cell module directly supplies power to the low-voltage components of the entire vehicle, and the battery efficiency is relatively high. A DCDC converter is arranged between the low-voltage battery cell module and the high-voltage battery cell module, and the operating modes of the low-voltage battery cell module, the high-voltage battery cell module and the DCDC converter are controlled according to the current operating conditions of the vehicle and the 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, which enables the low-voltage battery cell module to contribute to increasing the vehicle's endurance and prolonging the life of the low-voltage battery cell module, which can achieve the same life as the high-voltage battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The disclosure of the present application will become easier to understand with reference to the accompanying drawings. It should be understood that these drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present application. In the drawings:

[0041] Figure 1 is a schematic diagram of the structure 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 method for controlling a vehicle power supply system when the vehicle is in a parking condition in one embodiment of the present application;

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

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

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

[0047] The specific implementation of the present application is further described below with reference to the accompanying drawings.

[0048] It is easy to understand that according to the technical solution of the present application, without changing the essential spirit of the present application, a variety of structural modes and implementation modes that can be replaced by those skilled in the art can be replaced with each other. Therefore, the following specific implementation modes and drawings are only exemplary descriptions of the technical solution of the present application, and should not be regarded as the entirety of the present application or as a limitation or restriction on the technical solution of the application.

[0049] The directional terms such as up, down, left, right, front, back, front, back, top, bottom, etc. mentioned or may be mentioned in this specification are defined relative to the structures shown in the drawings. They are relative concepts and may change accordingly according to their different positions and different usage conditions. Therefore, these or other directional terms should not be interpreted as restrictive terms. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0050] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above-mentioned in this 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 follows Figure 1 As shown, the vehicle power supply system includes a battery pack provided with a low-voltage battery cell module 01 and a high-voltage battery cell module 02, and a DCDC converter 03 is connected between the low-voltage battery cell module 01 and the high-voltage battery cell module 02. The low-voltage battery cell module 01 is used to supply low-voltage power to the entire vehicle and to charge the high-voltage battery cell module 02 through the DCDC converter 03. The high-voltage battery cell module 02 is used to supply high-voltage power to the entire vehicle and to charge the low-voltage battery cell module 01 through the DCDC converter 03 or to supply low-voltage power to the entire vehicle.

[0052] In the vehicle power supply system of the embodiment of the present application, the low-voltage battery cell module 01 and the high-voltage battery cell module 02 are integrated in the same battery pack, and can share a battery management system, which saves costs and has high safety. Among them, the low-voltage battery cell modules 01 can directly supply power to the low-voltage components 04 of the whole vehicle, and the battery efficiency is relatively high. A DCDC converter 03 is set between the low-voltage battery cell module 01 and the high-voltage battery cell module 02. The low-voltage battery cell module 01 can also charge the high-voltage battery cell module 01 through the DCDC converter 03. The low-voltage battery cell module 01 can simultaneously supply power to the low-voltage components 04 of the whole vehicle and charge the high-voltage battery cell module 01; the high-voltage battery cell module 02 directly supplies power to the high-voltage components 05 of the whole vehicle, and can also charge the low-voltage battery cell module 01 or supply power to the low-voltage components 04 of the whole vehicle through the DCDC converter 03. The high-voltage battery cell module 02 can simultaneously perform two or three of the following working conditions: supply power to the high-voltage components 05 of the whole vehicle, charge the low-voltage battery cell module 01, and supply power to the low-voltage components 04 of the whole vehicle.

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

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

[0055] Step S202: Control the working modes of the low-voltage battery module, the high-voltage battery module and the DCDC converter according to the current working condition of the vehicle and the 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 may include parking, driving and charging. The goal of the control method of the embodiment 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 battery module and the high-voltage battery module have different effects on its SOC. For this reason, the embodiment of the present application obtains the current working condition of the vehicle, the real-time low-voltage SOC and the real-time high-voltage SOC, and controls the working modes of the low-voltage battery module, the high-voltage battery module and the DCDC converter in real time according to the current working condition of the vehicle, the size relationship between the current working condition of the vehicle, 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 real-time low-voltage SOC is balanced with the real-time high-voltage SOC, which can make the low-voltage battery module contribute to increase the vehicle's endurance, and extend the life of the low-voltage battery module, and can achieve the same life as the high-voltage battery.

[0057] In one embodiment, when the current working condition of the vehicle is the parking condition, the working modes of the low-voltage battery module, the high-voltage battery module and the DCDC converter are controlled according to the current working condition of the vehicle and the relationship between the real-time low-voltage SOC and the real-time high-voltage SOC, such as Figure 3 As shown, specifically including:

[0058] Step S301: In response to a vehicle start command, control the low-voltage battery module to supply low-voltage power to the entire vehicle to start the vehicle.

[0059] When the vehicle is in the parking condition, the low-voltage battery module needs to supply power to the low-voltage components of the entire vehicle before the vehicle can be started. Therefore, in the parking condition, after receiving the vehicle start command, the low-voltage battery module is first controlled to supply low-voltage power to the entire vehicle to start the vehicle.

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

[0061] After the vehicle is started, the high-voltage components of the vehicle are not working. At this time, the working modes of the low-voltage battery module, high-voltage battery module and 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 the real-time high-voltage SOC, including:

[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 battery module is controlled to discharge to supply low-voltage power to the entire vehicle, and the DCDC converter is controlled to invert the output so that the low-voltage battery module charges the high-voltage battery 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. The low-voltage battery module should supply power to the low-voltage components of the vehicle. At the same time, in order to make the SOC of the low-voltage battery module and the high-voltage battery module approach to equality as soon as possible, the DCDC converter inverter output is controlled to convert the low voltage of the low-voltage battery module into high voltage and then charge the high-voltage battery module. At this time, the DCDC converter works at maximum power to increase the SOC balancing speed.

[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 low-voltage power to the entire vehicle, and the DCDC converter and the high-voltage battery module are controlled not 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, it is necessary to reduce the SOC of the low-voltage battery module and / or increase the SOC of the high-voltage battery module. Since the difference between the real-time low-voltage SOC and the real-time high-voltage SOC is not large, the low-voltage battery module can be used to supply power to the low-voltage components of the vehicle to reduce the SOC of the low-voltage battery module so that the SOCs of the two tend to be equal. At this time, the low-voltage battery module is controlled to discharge to supply low-voltage power to the vehicle, and the DCDC converter and the high-voltage battery module are controlled not 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 output in a positive direction so that the high-voltage battery module charges the low-voltage battery module and supplies low-voltage power to the entire vehicle.

[0067] When the real-time low-voltage SOC is less than the real-time high-voltage SOC, it is necessary to increase the SOC of the low-voltage battery module and / or reduce the SOC of the high-voltage battery module. The power consumption of the low-voltage battery module should be minimized. At this time, the forward output of the DCDC converter is controlled to allow the high-voltage battery module to charge the low-voltage battery module and supply low-voltage power to the entire vehicle. The DCDC converter operates at maximum power to reduce the SOC of the high-voltage battery module.

[0068] When the vehicle is in a parking condition, the embodiment of the present application receives a vehicle start command, first controls the low-voltage battery cell module to supply low-voltage power to the entire vehicle to start the vehicle, and then controls whether the high-voltage battery cell module or the low-voltage battery cell module supplies low-voltage power to the entire vehicle, and whether charging and discharging are performed between the high-voltage battery cell module and the low-voltage battery cell module, based on the size and difference threshold of the real-time low-voltage SOC and the real-time high-voltage SOC, so that the SOCs of the two tend to be the same.

[0069] In one embodiment, when the current working condition of the vehicle is the running condition, the working modes of the low-voltage battery module, the high-voltage battery module and the DCDC converter are controlled according to the current working condition of the vehicle and the relationship between the real-time low-voltage SOC and the real-time high-voltage SOC, such as Figure 4 As shown, specifically including:

[0070] Step S401: 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 are controlled to discharge at the same rate, and the DCDC 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 entire vehicle.

[0071] When the vehicle is in driving condition, both the low-voltage components and the high-voltage components of the vehicle need to be powered. 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 battery module and the high-voltage battery module discharged at the same rate to maintain the SOC of the two equal. However, the high-voltage demand of the whole vehicle is different from the low-voltage demand of the whole vehicle. For this reason, the positive output of the DCDC converter is controlled so that the high-voltage battery module and the low-voltage battery module jointly supply power to the low voltage of the whole vehicle, and the high-voltage battery module supplies power to the high-voltage components of the whole vehicle. The low-voltage battery module maintains the same discharge rate as the high-voltage battery module. If the low-voltage demand of the whole vehicle is not met, the difference power is provided by the high-voltage battery module through the DCDC converter, thereby keeping 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 battery cell module is controlled to discharge according to the low-voltage load power of the whole vehicle to supply low-voltage power to the whole vehicle, and the high-voltage battery cell module is controlled to discharge according to the high-voltage load power of the whole vehicle to supply high-voltage power to the whole vehicle, and the DCDC converter is controlled not to work.

[0073] If 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. At this time, the low-voltage battery module directly supplies low-voltage power to the entire vehicle, and the high-voltage battery module does not participate in the low-voltage power supply of the entire vehicle, that is, the DCDC converter does not work to consume the power of the low-voltage battery module, so that the SOC of the low-voltage battery module and the high-voltage battery 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 low-voltage load power of the whole 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 with maximum power so that the high-voltage battery module supplies low-voltage power to the whole vehicle, and the low-voltage battery module is controlled to discharge so as to supply low-voltage power to the whole vehicle.

[0075] If the real-time low-voltage SOC is less than the real-time high-voltage SOC, it is necessary to reduce the power of the high-voltage battery module and reduce the power consumption of the low-voltage battery module. When the low-voltage load power of the vehicle is greater than or equal to the maximum power of the DCDC converter, it means that the power supply of the high-voltage battery module through the DCDC converter cannot meet the power supply requirements of the low-voltage components of the vehicle. At this time, it is necessary to control the DCDC converter to output at the maximum power forward so that the high-voltage battery module supplies power to the low voltage of the vehicle, and control the low-voltage battery module to discharge to supply power to the low voltage of the vehicle to provide the difference power.

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

[0077] If the real-time low-voltage SOC is less than the real-time high-voltage SOC, it is necessary to reduce the power of the high-voltage battery module and reduce the power consumption of the low-voltage battery module. When the low-voltage load power of the vehicle is less than the maximum power of the DCDC converter, it means that the power supply of the high-voltage battery module through the DCDC converter has surplus power in addition to meeting the power supply requirements of the low-voltage components of the vehicle. At this time, the DCDC converter is controlled to output in the forward direction with maximum power so that the high-voltage battery module supplies power to the low voltage of the vehicle, and at the same time, the remaining energy is charged to the low-voltage battery module. While reducing the SOC of the high-voltage battery module, the SOC of the low-voltage battery module is increased.

[0078] In the embodiment of the present application, when the vehicle is in a driving condition, the SOC of the high-voltage battery module and the low-voltage battery module are dynamically adjusted according to the above strategy so that the SOC of the high-voltage battery module and the low-voltage battery module tend to be equal.

[0079] In one embodiment, when the current working condition of the vehicle is a charging condition, the working modes of the low-voltage battery module, the high-voltage battery module and the DCDC converter are controlled according to the current working condition of the vehicle and the relationship between the real-time low-voltage SOC and the real-time high-voltage SOC, such as Figure 5 As shown, specifically including:

[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 a 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 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, it is necessary to maintain the low-voltage battery module and the high-voltage battery module to charge at the same rate. The low-voltage battery module needs to be charged by the DCDC converter to invert the voltage charged by the charging pile to the high-voltage battery module into a low voltage, so it is necessary to control the forward output of the DCDC converter.

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

[0083] When the real-time low-voltage SOC is greater than the real-time high-voltage SOC, it is necessary to reduce the power of the low-voltage battery module and increase the power of the high-voltage battery module. At this time, the DCDC converter inverter output is controlled to control the low-voltage battery module to charge the high-voltage battery module. The charging pile and the low-voltage battery module charge the high-voltage battery module at the same time, so that the power 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, the DCDC converter is controlled to output in the forward direction with maximum power, and the high-voltage battery module is controlled 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 output in the maximum forward direction and charge the low-voltage battery module with the maximum power, so that the SOC of the low-voltage battery module increases at the fastest speed and tends to the SOC of the high-voltage battery module.

[0086] In the embodiment of the present application, when the vehicle is in a charging condition, the SOC of the high-voltage battery module and the low-voltage battery module are dynamically adjusted according to the above strategy so that the SOC of the high-voltage battery module and the low-voltage battery module tend to be equal.

[0087] The technical solution of the present application also provides a storage medium, which stores computer instructions. When a computer executes the computer instructions, it is used to execute the control method of the vehicle power supply system in any of the aforementioned embodiments.

[0088] Figure 6 An electronic device of the present application is shown, comprising:

[0089] at least one processor 601; and,

[0090] A memory 602 is communicatively connected to the at least one processor 601; wherein,

[0091] The memory 602 stores instructions that can be executed by the at least one processor 601, and the instructions are executed by the at least one processor 601 so that the at least one processor 601 can execute all steps of the vehicle power supply system control method in any of the aforementioned method embodiments.

[0092] Figure 6 Take a processor 602 as an example:

[0093] The electronic device may 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 may be connected via a bus or other means, and the figure takes the connection via a bus as an example.

[0095] The memory 602 is a non-volatile computer-readable storage medium that 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 embodiment of the present application, for example, Figure 2-Figure 5 The processor 601 executes various functional 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 embodiment.

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

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

[0098] The one or more modules are stored in the memory 602 , and 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 description is only the principle and preferred embodiment of the present application. It should be pointed out that for ordinary technicians in this field, the implementation methods obtained by appropriately combining the technical solutions disclosed in different embodiments are also included in the technical scope of the present invention. On the basis of the principle of the present application, several other variations can be made, which should also be regarded as the protection scope of the present application.

Claims

1. A control method for a vehicle power supply system, characterized in that: The vehicle power supply system includes a battery pack provided with a low-voltage battery cell module and a high-voltage battery cell module, a DCDC converter is connected between the low-voltage battery cell module and the high-voltage battery cell module, the low-voltage battery cell module is used to supply low-voltage power to the whole vehicle and charge the high-voltage battery cell module through the DCDC converter, and the high-voltage battery cell module is used to supply high-voltage power to the whole vehicle and charge the low-voltage battery cell module through the DCDC converter or supply low-voltage power to the whole vehicle; the control method includes: Acquire the current operating condition of the vehicle, the real-time low-voltage SOC of the low-voltage battery module, and the real-time high-voltage SOC of the high-voltage battery module; The operating modes of the low-voltage battery cell module, the high-voltage battery cell module and the DCDC converter are controlled according to the current operating conditions of the vehicle and the 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.

2. The control method of the vehicle power supply system according to claim 1, characterized in that: The current working condition of the vehicle includes a parking condition, and the working modes of the low-voltage battery module, the high-voltage battery module and the DCDC converter are controlled according to the current working condition of the vehicle and the magnitude relationship between the real-time low-voltage SOC and the real-time high-voltage SOC, specifically including: When the current working condition of the vehicle is the parking condition: In response to a vehicle start command, controlling the low-voltage battery module to supply low-voltage power to the entire vehicle to start the vehicle; The operating modes of the low-voltage battery cell module, the high-voltage battery cell module and the DCDC converter are controlled according to the magnitude relationship between the real-time low-voltage SOC and the real-time high-voltage SOC.

3. The control method of the vehicle power supply system according to claim 2, characterized in that: The controlling the working modes of the low-voltage battery module, the high-voltage battery module and the DCDC converter according to the magnitude relationship between the real-time low-voltage SOC and the real-time high-voltage SOC specifically includes: 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 battery module is controlled to discharge to supply low-voltage power to the entire vehicle, and the DCDC converter is controlled to invert the output so that the low-voltage battery module charges the high-voltage battery module; 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 low-voltage power to the entire vehicle, and the DCDC converter and the high-voltage battery module are controlled not to work; If the real-time low-voltage SOC is less than the real-time high-voltage SOC, the DCDC converter is controlled to output in a forward direction so that the high-voltage battery cell module charges the low-voltage battery cell module and supplies low-voltage power to the entire vehicle.

4. The control method of the vehicle power supply system according to claim 1, characterized in that: The current working condition of the vehicle includes a running working condition, and the working modes of the low-voltage battery module, the high-voltage battery module and the DCDC converter are controlled according to the current working condition of the vehicle and the magnitude relationship between the real-time low-voltage SOC and the real-time high-voltage SOC, specifically including: When the current working condition of the vehicle is the running condition: 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 are controlled to discharge at the same rate, and the DCDC converter is controlled to output in a forward direction so that the high-voltage battery module and the low-voltage battery module jointly supply low-voltage power to the entire vehicle.

5. The control method of the vehicle power supply system according to claim 4, characterized in that: The method of controlling the working modes of the low-voltage battery module, the high-voltage battery module and the DCDC converter according to the current working condition of the vehicle and the magnitude relationship between the real-time low-voltage SOC and the real-time high-voltage SOC also includes: When the current working condition of the vehicle is the running condition: 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 low-voltage load power of the whole vehicle to supply low voltage to the whole vehicle, the high-voltage battery cell module is controlled to discharge according to the high-voltage load power of the whole vehicle to supply high voltage to the whole vehicle, and the DCDC converter is controlled not to work.

6. The control method of the vehicle power supply system according to claim 5, characterized in that: The method of controlling the working modes of the low-voltage battery module, the high-voltage battery module and the DCDC converter according to the current working condition of the vehicle and the magnitude relationship between the real-time low-voltage SOC and the real-time high-voltage SOC also includes: When the current working condition of the vehicle is the running condition: If the real-time low-voltage SOC is less than the real-time high-voltage SOC and the low-voltage load power of the whole vehicle is greater than or equal to the maximum power of the DCDC converter, the DCDC converter is controlled to output in a forward direction with maximum power so that the high-voltage battery module supplies low-voltage power to the whole vehicle, and the low-voltage battery module is controlled to discharge so as to supply low-voltage power to the whole vehicle; If the real-time low-voltage SOC is less than the real-time high-voltage SOC and the low-voltage load power of the whole vehicle is less than the maximum power of the DCDC converter, the DCDC converter is controlled to output in the maximum forward power so that the high-voltage battery module can simultaneously supply low-voltage power to the whole vehicle and charge the low-voltage battery module.

7. The control method of the vehicle power supply system according to claim 1, characterized in that: The current working condition of the vehicle includes a charging working condition, and the working modes of the low-voltage battery module, the high-voltage battery module and the DCDC converter are controlled according to the current working condition of the vehicle and the magnitude relationship between the real-time low-voltage SOC and the real-time high-voltage SOC, specifically including: When the current working condition of the vehicle is the charging 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 a forward direction, and the low-voltage battery cell module and the high-voltage battery cell module are controlled to charge at the same rate.

8. The control method of the vehicle power supply system according to claim 7, characterized in that: The current working condition of the vehicle includes a charging working condition, and the working modes of the low-voltage battery module, the high-voltage battery module and the DCDC converter are controlled according to the current working condition of the vehicle and the magnitude relationship between the real-time low-voltage SOC and the real-time high-voltage SOC, specifically including: When the current working condition of the vehicle is the charging condition: If the real-time low-voltage SOC is greater than the real-time high-voltage SOC, the DCDC converter is controlled to invert and output, and the low-voltage battery cell module is controlled to charge the high-voltage battery cell module.

9. The control method of the vehicle power supply system according to claim 8, characterized in that: The current working condition of the vehicle includes a charging working condition, and the working modes of the low-voltage battery module, the high-voltage battery module and the DCDC converter are controlled according to the current working condition of the vehicle and the magnitude relationship between the real-time low-voltage SOC and the real-time high-voltage SOC, specifically including: When the current working condition of the vehicle is the charging 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 a forward direction with maximum power, and the high-voltage battery cell module is controlled to charge the low-voltage battery cell module.

10. A storage medium, characterized in that: The storage medium stores computer instructions, and when a computer executes the computer instructions, it is used to execute the control method of the vehicle power supply system as described in any one of claims 1-9.

11. An electronic device, characterized in that: comprising at least one processor; and, a memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the control method of the vehicle power supply system as described in any one of claims 1-9.

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