Power supply device, battery management system, power supply system, control method and medium

Abstract

This application provides a power supply device, a battery management system, a power supply system, a control method, and a medium. The method includes: when the vehicle is parked, controlling a first battery pack of the power supply device to supply power to a first load of the vehicle, and controlling the first battery pack and a second battery pack of the power supply device to stop supplying power to a second load of the vehicle (S410); during the process of supplying power to the first load, acquiring the capacity parameters of the first battery pack (S420); if the capacity parameters of the first battery pack are lower than a first preset capacity threshold, controlling a DC-DC converter to transfer electrical energy from the second battery pack to the first battery pack (S430). This method enables a more flexible power supply strategy.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a power supply device, a battery management system, a power supply system, a control method and a medium. Background Art

[0002] With the development of new energy technology, more and more fields are using new energy as a power source. Due to its advantages such as high energy density, rechargeable, safe and environmentally friendly, power batteries are widely used in new energy vehicles, energy storage systems and other fields.

[0003] In the field of new energy vehicles, the power supply strategy of new energy vehicles has gradually attracted public attention. However, in the existing power supply strategy, the battery pack can output 12V voltage, or the 12V output voltage of the battery pack can be converted to 48V through a direct current-direct current (DCDC) converter. The entire power supply strategy is relatively simple. Summary of the invention

[0004] The power supply device, battery management system, power supply system, control method and medium provided in the embodiments of the present application can make the power supply strategy more flexible.

[0005] In a first aspect, an embodiment of the present application provides a control method for a power supply device, which is applied to a battery management system BMS, and the method includes:

[0006] When the vehicle is in a parked state, controlling the first battery pack of the power supply device to supply power to a first load of the vehicle, and controlling the first battery pack and the second battery pack of the power supply device to stop supplying power to a second load of the vehicle;

[0007] In the process of supplying power to the first load, obtaining a capacity parameter of the first battery pack;

[0008] When the capacity parameter of the first battery group is lower than the first preset capacity threshold, the DC converter is controlled to transfer the electric energy of the second battery group to the first battery group.

[0009] The control method of the power supply device of an embodiment of the present invention can utilize the first battery pack to power a first load of the vehicle when the vehicle is in a parked state, and during this power supply process, if the capacity parameter of the first battery pack is lower than a first preset capacity threshold, the DC converter can transfer energy from the second battery pack to the first battery pack, so that during the process of the first battery pack supplying power to the load, the first battery pack can be recharged according to the capacity parameter of the first battery pack, thereby making the power supply strategy more flexible.

[0010] In a second aspect, an embodiment of the present invention provides a control method for a power supply device, which is applied to a battery management system BMS, and the method includes:

[0011] When the vehicle is in a driving state, controlling the first battery pack of the vehicle to supply power to a first load of the vehicle, and controlling the first battery pack and the second battery pack of the vehicle to supply power to a second load;

[0012] In the process of supplying power to the first load and the second load, obtaining capacity parameters of the first battery pack and the second battery pack;

[0013] When the absolute value of the difference between the capacity parameter of the first battery pack and the capacity parameter of the second battery pack is greater than a preset threshold, the DC converter is controlled to transfer the electric energy of the high-capacity battery pack to the low-capacity battery pack.

[0014] Among them, the high-capacity battery pack is a battery pack with a higher capacity parameter among the first battery pack and the second battery pack, and the low-capacity battery pack is a battery pack with a lower capacity parameter among the first battery pack and the second battery pack of the vehicle.

[0015] The control method of the power supply device of the embodiment of the present invention can use the first battery pack to power the first load of the vehicle when the vehicle is in a driving state, and use the first battery pack and the second battery pack to power the second load. In the power supply process, the DC converter can supplement the power between the first battery pack and the second battery pack according to the capacity parameters of the first battery pack and the second battery pack, balancing the power of the two, thereby making the power supply strategy more flexible.

[0016] In a third aspect, an embodiment of the present invention provides a battery management system BMS, which is arranged in a vehicle and includes:

[0017] A first control module is used to control the first battery pack of the power supply device to supply power to a first load of the vehicle, and control the first battery pack and the second battery pack of the power supply device to stop supplying power to a second load of the vehicle when the vehicle is in a parked state;

[0018] A first parameter acquisition module, used to acquire a capacity parameter of the first battery pack in the process of supplying power to the first load;

[0019] The second control module is used to control the DC converter to transfer the electric energy of the second battery group to the first battery group when the capacity parameter of the first battery group is lower than the first preset capacity threshold.

[0020] The battery management system BMS of an embodiment of the present invention can utilize the first battery pack to power a first load of the vehicle when the vehicle is in a parked state, and during this power supply process, if the capacity parameter of the first battery pack is lower than a first preset capacity threshold, the DC converter can transfer energy from the second battery pack to the first battery pack, so that during the process of the first battery pack powering the load, the first battery pack can be recharged according to the capacity parameter of the first battery pack, thereby making the power supply strategy more flexible.

[0021] In a fourth aspect, an embodiment of the present invention provides a battery management system BMS, which is arranged in a vehicle and includes:

[0022] A third control module is used to control the first battery pack of the vehicle to supply power to the first load of the vehicle, and control the first battery pack and the second battery pack of the vehicle to supply power to the second load when the vehicle is in a driving state;

[0023] A second parameter acquisition module, used for acquiring a capacity parameter of the first battery pack and a capacity parameter of the second battery pack in the process of supplying power to the first load and the second load;

[0024] a fourth control module, configured to control the DC converter to transfer electric energy from the high-capacity battery pack to the low-capacity battery pack when the absolute difference between the capacity parameter of the first battery pack and the capacity parameter of the second battery pack is greater than a preset threshold value;

[0025] Among them, the high-capacity battery pack is a battery pack with a higher capacity parameter among the first battery pack and the second battery pack, and the low-capacity battery pack is a battery pack with a lower capacity parameter among the first battery pack and the second battery pack of the vehicle.

[0026] The battery management system BMS of the embodiment of the present invention can use the first battery pack to power the first load of the vehicle when the vehicle is in driving state, and use the first battery pack and the second battery pack to power the second load. In the power supply process, the DC converter can supplement the power between the first battery pack and the second battery pack according to the capacity parameters of the two battery packs, balancing the power of the two, so as to make the power supply strategy more flexible.

[0027] In a fifth aspect, an embodiment of the present invention provides a power supply device, the device comprising:

[0028] A first battery pack, wherein the positive electrode of the first battery pack is connected to the negative electrode of the second battery pack, the positive electrode of the first battery pack is further connected to one end of the first load through the first switch module, the negative electrode of the first battery pack is connected to a first reference potential, and the other end of the first load is connected to a second reference potential;

[0029] A second battery pack, wherein the positive electrode of the second battery pack is connected to one end of a second load through a second switch module, wherein the other end of the second load is connected to a third reference potential;

[0030] A DC converter, one end of the DC converter is connected to the positive electrode of the first battery pack, and the other end of the DC converter is connected to the positive electrode of the second battery pack. The DC converter is used to transfer energy between the first battery pack and the second battery pack according to a control signal.

[0031] The power supply device provided in the embodiment of the present application can realize different power supply schemes through the switch control strategy of the first switch module and the second switch module. For example, when the first switch module is closed and the second switch module is disconnected, power can be supplied to the first load, and when the first switch module and the second switch module are closed, power can be supplied to the first load and the second load at the same time. In addition, energy can be transmitted between the first switch module and the second switch module through a DC converter, which improves the control flexibility and improves the effect of balancing power consumption.

[0032] In a sixth aspect, a battery management system BMS is provided, comprising: a memory for storing a program;

[0033] A processor is used to run a program stored in a memory to execute the control method of the power supply device provided by the first aspect, any optional implementation of the first aspect, the second aspect, or any optional implementation of the second aspect.

[0034] In the seventh aspect, a computer storage medium is provided, on which computer program instructions are stored. When the computer program instructions are executed by a processor, the control method of the power supply device provided by the first aspect, any optional implementation of the first aspect, the second aspect, or any optional implementation of the second aspect is implemented. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without paying creative work.

[0036] Figure 1 It is a structural schematic diagram of a battery power supply system in the related art;

[0037] Figure 2 is a structural schematic diagram of a power supply device provided in an embodiment of the present application;

[0038] Figure 3 is a structural schematic diagram of another power supply device provided in an embodiment of the present application;

[0039] Figure 4 It is a flow chart of a control method of a power supply device provided in an embodiment of the present application;

[0040] Figure 5 is a flow chart of another control method of a power supply device provided in an embodiment of the present application;

[0041] Figure 6 It is a structural schematic diagram of a BMS provided in an embodiment of the present application;

[0042] Figure 7 is a schematic diagram of the structure of another BMS provided in an embodiment of the present application;

[0043] Figure 8 A schematic diagram of the hardware structure of a BMS provided in an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0044] The following detailed description and drawings of the embodiments of the present application are used to illustrate the principles of the present application, but cannot be used to limit the scope of the present application, that is, the present application is not limited to the described embodiments.

[0045] In the description of the present application, it should be noted that, unless otherwise specified, "multiple" means more than two; the terms "upper", "lower", "left", "right", "inside", "outside", etc., indicating the orientation or positional relationship, are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not strictly vertical, but is within the allowable error range. "Parallel" is not strictly parallel, but is within the allowable error range.

[0046] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of this application. In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0047] In some cases, a battery powered system is provided. Figure 1The figure is a schematic diagram of the structure of a battery power supply system in the related art. Figure 1 As shown, the battery power supply system specifically includes: a battery pack 10, a first direct current-direct current (DCDC) converter 20, a second DCDC converter 30, a load 40, a switch K1, a switch K2, a switch K3, and a diode D1 connected in parallel at both ends of the switch K3. The battery pack 10 includes a lithium iron phosphate battery 11 and a lithium iron phosphate battery 12.

[0048] Among them, the positive electrode of the lithium iron phosphate battery 11 outputs a voltage of 12V, that is, the voltage at point b is 12V. After the lithium iron phosphate battery 11 and the lithium iron phosphate battery 12 are connected in series, the voltage of the positive electrode of the lithium iron phosphate battery 12 is 48V, that is, the voltage at point c is 48V. The input end of the first DCDC converter 20 is connected to the positive electrode of the lithium iron phosphate battery 12 through the switch K1, and the output end of the first DCDC converter 20 is connected to the load 40. The input end of the second DCDC converter 30 is connected to the positive electrode of the lithium iron phosphate battery 12 through the switch K2, and the output end of the second DCDC converter 30 is connected to the positive electrode of the lithium iron phosphate battery 11 through the switch K3.

[0049] Specifically, when the electric vehicle stops working, the switch K1 is closed, the first DCDC converter 20 works, and outputs a first voltage, which can supply power to a low-power load 40 such as an alarm. The first voltage can range from 30V to 60V.

[0050] When the electric vehicle starts, the switch K2 is closed, the second DCDC converter 30 works, and the second DCDC converter 30 converts the 48V voltage into a 14V voltage, and uses the 14V voltage to power the load 40. At this time, since 14V is higher than the positive electrode voltage of the first battery pack 12V, the diode D1 is not turned on, and the 14V cannot charge the first battery pack.

[0051] During the driving of the electric vehicle, the switch K2 and the switch K3 are closed, the second DCDC converter 30 is working, and the voltage output from the second DCDC converter 30 not only supplies power to the load 40, but also charges the lithium iron phosphate battery 11. At this time, if the second DCDC converter 30 fails, the diode D1 is turned on, and the lithium iron phosphate battery 11 supplies power to the low-voltage electrical appliance to ensure the normal operation of the load 40.

[0052] However, in this power supply strategy, the first DCDC converter 20 and the second DCDC converter 30 are only used to change the output voltage of the power supply. When replenishing the lithium iron phosphate battery 11, K3 is controlled to be closed, so that the 14V voltage output by the second DCDC converter 30 is greater than the 12V voltage of the positive electrode of the lithium iron phosphate battery 11, thereby charging the lithium iron phosphate battery 11. The flexibility of the power supply strategy is relatively single, and the design of multiple DCDC converters also makes the power supply strategy inefficient.

[0053] In order to solve the problems of the prior art, an embodiment of the present invention provides a power supply solution that can be applied to a scenario where a vehicle is in a parked state. The voltage of the first battery pack can be used to power the first load, and when the capacity parameter of the first battery pack is lower than the first preset capacity threshold, the DC converter is used to transfer the electric energy of the second battery pack to the first battery pack, thereby supplementing the power of the first battery pack, thereby improving the flexibility of the power supply solution.

[0054] The embodiment of the present application also provides another power supply scheme, which can be applied to the scenario where the vehicle is in driving state. The first battery pack can be used to power the first load, and the first battery pack and the second battery pack connected in series can be used to power the second load. Between the first battery pack and the second battery pack, the battery pack with higher capacity parameters can be used to supplement the battery pack with lower capacity parameters, thereby improving the flexibility of the power supply scheme.

[0055] First, in order to facilitate understanding of the embodiments of the present application, the following section will first specifically explain concepts such as battery packs, capacity parameters, battery management systems, and DCDC converters.

[0056] (1)Battery pack.

[0057] In terms of scale, the battery pack in the embodiment of the present application can be a battery cell, a battery module or a battery pack, which is not limited here. For example, the voltage of the first battery pack can be 12V, and the voltage of the second battery pack can be 36V. Accordingly, the voltage of the first battery pack and the second battery pack connected in series is 48V.

[0058] In terms of application scenarios, battery packs can be used in power devices such as automobiles and ships. For example, it can be used in electric vehicles to power the motor of electric vehicles as a power source for electric vehicles. The battery can also power other electrical devices in electric vehicles, such as in-car air conditioners, car players, etc. Exemplarily, the battery pack in the embodiment of the present application is applied to a hybrid electric vehicle, which is a pack-free design (i.e., no high-voltage battery pack). At this time, the first battery pack and the second battery pack can be used as a power source for the hybrid electric vehicle, and can also power low-voltage electrical devices in the hybrid electric vehicle.

[0059] In terms of types, the battery pack in the embodiment of the present application may be a lithium-ion battery, a lithium metal battery, a lead-acid battery, a nickel-cathode battery, a nickel-metal hydride battery, a lithium-sulfur battery, a lithium-air battery or a sodium-ion battery, etc., which is not limited here. In one embodiment, the battery pack in the embodiment of the present application may be a ternary lithium battery. Compared with the solution of selecting lithium iron phosphate battery as the battery pack in the above-mentioned related technology, the ternary lithium battery has a higher low-voltage platform, a larger specific capacity, and a higher energy density, and in a low temperature environment, such as -30°C to -10°C, the ternary lithium battery can ensure normal battery capacity. In another embodiment, the battery pack in the embodiment of the present application may be composed of different types of batteries. For example, the first battery pack may be a lithium iron phosphate battery, and the second battery pack may be a ternary battery, so that the power supply device can take into account the advantages of the long life of the lithium iron phosphate battery and the good low temperature performance of the ternary battery.

[0060] (2) Capacity parameter of the battery pack. In the embodiments of the present application, the capacity parameter of the battery pack refers to a parameter that can measure the capacity of the battery pack. In some embodiments, the capacity parameter of the battery pack can be at least one of the capacity value of the battery pack, the output voltage of the battery pack, and the battery state of charge (SOC) of the battery pack. Among them, SOC is the ratio of the remaining power of the battery at a certain discharge rate to the rated capacity under the same conditions.

[0061] (3) Battery Management System (BMS). It has the function of collecting / calculating battery parameters, as well as the function of managing the functional modules in the power supply device and the battery pack. For example, it can control the energy transmission direction of the DCDC converter, determine whether the capacity parameter of the battery pack is greater than a preset threshold, determine the size of the capacity parameter between two battery packs, and calculate SOC, etc.

[0062] (4) DCDC converter. It is used for DC voltage conversion, for example, it can convert an input first DC voltage into a second DC voltage for output. In one embodiment, the DCDC converter can be a bidirectional DCDC converter, that is, it can perform both step-up conversion and step-down conversion. Exemplarily, the DCDC converter can convert a 12V voltage into a 48V voltage, or it can convert a 48V voltage into a 12V voltage.

[0063] Secondly, before introducing the control scheme of the power supply device, the present application embodiment first combines Figure 2 The power supply device in the embodiment of the present application is described in detail.

[0064] Figure 2 Schematic diagram of a power supply device provided in an embodiment of the present application. Figure 2 As shown, the power supply device 50 includes a first battery pack 51 , a second battery pack 52 and a third DCDC converter 53 .

[0065] The following parts of this application will explain in detail the structure and working logic of the power supply device 50 in turn.

[0066] 1. Connection structure of power supply device 50:

[0067] The positive electrode DC1+ of the first battery pack 51 is connected to the negative electrode DC2- of the second battery pack 22, and the positive electrode DC1+ of the first battery pack 51 is also connected to one end of the first load 71 through the first switch module 61, and the negative electrode DC1- of the first battery pack 51 is connected to the first reference potential. The other end of the first load 71 is connected to the second reference potential GND2. For example, Figure 2 As shown, the first reference potential and the second reference potential may be ground terminals. Accordingly, the first reference potential may be represented as GND1, and the second reference potential may be represented as GND2.

[0068] The positive electrode DC2+ of the second battery pack 52 is connected to one end of the second load 72 through the second switch module 62. The other end of the second load 72 is connected to the third reference potential. Figure 2 , the third reference potential can be a ground terminal, and accordingly, the third reference potential can be expressed as GND3.

[0069] One end of the third DCDC converter 53 is connected to the positive electrode DC1+ of the first battery pack 51, and the other end of the third DCDC converter 53 is connected to the positive electrode DC2+ of the second battery pack 52. The third DCDC converter 53 is used to transfer energy between the first battery pack 51 and the second battery pack 52 according to a control signal. In some embodiments, the control signal may be sent by a BMS.

[0070] In some embodiments, see Figure 2 , the number of DCDC in the power supply device 50 is 1, that is, the DCDC in the power supply device 50 only includes the third DCDC converter 53. Figure 1 Compared with the circuit shown in the figure, the number of DCDCs is reduced, and only one DCDC is used to power the load and charge the battery pack, making the power supply strategy more efficient.

[0071] The power supply device 50 provided in the embodiment of the present application can realize different power supply schemes through the switch control strategy of the first switch module 61 and the second switch module 62. For example, when the first switch module 61 is closed and the second switch module 62 is disconnected, the first battery pack 51 can be used to power the first load 71, and when the first switch module and the second switch module are closed, the first battery pack 51 and the second battery pack 52 connected in series can be used to power the first load 71 and the second load 72. In addition, energy can be transmitted between the first battery pack 51 and the second battery pack 52 through the third DCDC converter 53, which improves the control flexibility and improves the effect of balancing power consumption.

[0072] In some embodiments, the first switch module 61 and the second switch module 62 in the embodiments of the present application can each be implemented as: at least one mechanical switch, at least one semiconductor switch, or a hybrid switch consisting of at least one mechanical switch and at least one semiconductor switch.

[0073] The mechanical switch may be a relay or other mechanical switch, without limitation. The semiconductor switch refers to a switch made of semiconductor. For example, the semiconductor switch may be implemented as at least one of a triode, a metal-oxide-semiconductor field-effect transistor (MOSFET), an insulated gate bipolar transistor (IGBT), etc., without limitation on the specific type of the semiconductor switch.

[0074] In some embodiments, the first switch module 61 and / or the second switch module 62 each include two transistors connected in series, and the sources of the two transistors connected in series are connected. Each transistor is connected to a body diode, the source of each transistor is connected to the anode of the corresponding body diode, and the drain of each transistor is connected to the cathode of the corresponding body diode.

[0075] In this embodiment, the switch module is set as a transistor with a common source connection, which can perform anti-reverse protection, improve the safety of the switch module, and prevent damage to the battery pack even if the switch module is misoperated due to human reasons.

[0076] In order to facilitate understanding of the specific structure of the switch module, the present application embodiment will be combined with Figure 3 This is explained. Figure 3 It is a structural schematic diagram of another power supply device provided in an embodiment of the present application.

[0077] like Figure 3As shown, the first switch module 61 and the first switch module 62 can be implemented as N-MOSFET tubes. The first switch module 61 includes a first MOS tube SW1 and a second MOS tube SW2. The source S1 of the first MOS tube SW1 and the second MOS tube SW2 are connected, the drain D1 of the first MOS tube SW1 is connected to the positive electrode DC2+ of the second battery pack 52, and the drain D2 of the second MOS tube SW2 is connected to one end of the second load 72. The second switch module 62 includes a third MOS tube SW3 and a fourth MOS tube SW4. The source S3 of the third MOS tube SW3 and the fourth MOS tube SW4 are connected, the drain D3 of the third MOS tube SW3 is connected to the positive electrode DC1+ of the first battery pack 51, and the drain D4 of the fourth MOS tube SW4 is connected to one end of the first load 71.

[0078] It should be noted that the two switch modules can also be implemented as P-MOSFET tubes, and the principle thereof is similar to that of N-MOSFET tubes, which will not be described in detail here.

[0079] In some embodiments, the power supply device 50 may further include a BMS 54 for controlling each module of the power supply device. Figure 3 , BMS54 can be connected to the control terminals of MOS tubes SW1 to SW4, that is, gates G1 to G4. BMS54 can output pulse signals to control the on and off of each MOS tube.

[0080] Furthermore, the BMS 54 may also collect battery status parameters such as voltage from the first battery pack 51 and the second battery pack 52 .

[0081] In addition, the BMS 54 can also control the energy transmission mode of the third DCDC converter 53. For example, the third DCDC converter 53 can be controlled to obtain electric energy from the second battery pack 54, and then step down the electric energy to supplement the first battery pack 51. Alternatively, the third DCDC converter 53 can be controlled to obtain electric energy from the first battery pack 51, and then step up the electric energy to supplement the second battery pack 52.

[0082] In some embodiments, the first load 71 may include low-voltage electrical devices in the vehicle. Regardless of whether the vehicle is started or not, the first load 71 requires a power supply device to provide it with electrical energy. For example, the first load 71 may be a window controller, a cigarette lighter, a dashboard, a smoke alarm, etc. of the vehicle. Compared with the second load 72, the power supply voltage required by the first load 71 may be a smaller value, such as 12V. It should be noted that the 12V voltage is only a feasible example. The embodiment of the present application does not limit the specific value of the first load 71, and it can be set according to the specific scenario and actual needs.

[0083] In some embodiments, the second load 72 may include a motor of the vehicle and an engine of the vehicle. The first load 72 requires a power supply device to provide it with electrical energy when the vehicle starts. For example, the second load 72 may be a power device of the vehicle, such as a motor, a generator, etc. Compared with the first load 71, the power supply voltage required by the second load 72 may be a larger value, such as 48V. It should be noted that the 48V voltage is only a feasible example. The embodiment of the present application does not limit the specific value of the second load 72, and it can be set according to the specific scenario and actual needs.

[0084] 2. Working logic of the power supply device 50:

[0085] Continue with Figure 2 For example, when the first switch module 61 is closed, the first battery group 51 and the first load 71 are connected, and the first battery group 51 supplies power to the first load 71. When the first switch module 51 and the second switch module 52 are both closed, the first battery group 51 supplies power to the first load 71, and the first battery group 51 and the second battery group 52 are connected in series to supply power to the second load 72.

[0086] When the first switch module 61 is closed and the second switch module 62 is open, the first battery pack 51 is in a power consumption state and the second battery pack 52 is in a static state. The third DCDC converter 53 can use the second battery pack 52 to supplement power for the first battery pack 51 .

[0087] When the first switch module 61 and the second switch module 62 are closed, the first battery group 51 and the second battery group 52 are both in a power consumption state. At this time, energy balancing operation can be performed on the two according to their capacity parameters.

[0088] After introducing the power supply device in detail, the following part of the embodiment of the present application will specifically explain a method provided by the embodiment of the present application for controlling the power supply device when the vehicle is in a parked state in combination with the drawings.

[0089] Figure 4 1 is a flow chart of a control method for a power supply device provided in an embodiment of the present application. Figure 4 As shown, the control method 400 of the power supply device includes S410 to S430. The execution subject of each step of the control method 400 of the power supply device may be a BMS.

[0090] S410, when the vehicle is in a parked state, controlling the first battery pack of the power supply device to supply power to a first load of the vehicle, and controlling the first battery pack and the second battery pack of the power supply device to stop supplying power to a second load of the vehicle.

[0091] In some embodiments, the parking state in the embodiments of the present application may represent the whole vehicle being turned off.

[0092] In some embodiments, if the power supply module further includes a first switch module and a second switch module. Figure 3 The specific implementation of S410 may include: controlling the first switch module 61 to be closed and the second switch module 62 to be opened.

[0093] In some embodiments, if the first switch module and the second switch module each include two transistors connected in series, a specific implementation of S410 may include: controlling the two transistors in the first switch module to be turned on, and controlling the two transistors in the second switch module to be turned off.

[0094] For example, continue to refer to the above Figure 4 The specific implementation of S410 may include: controlling the first MOS transistor SW1 and the second MOS transistor SW2 to be closed, and controlling the third MOS transistor SW3 and the fourth MOS transistor SW4.

[0095] In this embodiment, when the first MOS transistor SW1 and the second MOS transistor SW2 are both in a closed state, current can pass through the source and drain of the two MOS transistors, thereby reducing the energy loss of the body diode and improving the power supply efficiency.

[0096] In some embodiments, the BMS can obtain the vehicle status through the vehicle controller.

[0097] At this time, the specific implementation of S410 may include:

[0098] Step 1: Receive notification information sent by the vehicle controller of the vehicle.

[0099] In some embodiments, the vehicle controller can determine whether the vehicle is in a parking state or a driving state, and inform the BMS of the vehicle's state in the form of a notification message. Specifically, the vehicle controller and the BMS can be connected by wire or wirelessly. Exemplarily, the vehicle controller and the BMS can be connected in a controller area network (CAN) bus communication mode. Accordingly, the specific form of the notification information can be a CAN message.

[0100] Step 2: When the notification information indicates that the vehicle is in a parked state, in response to the notification information, the first battery pack is controlled to supply power to the first load, and the first battery pack and the second battery pack are controlled to stop supplying power to the second load.

[0101] The specific content of step 2 is similar to the implementation of S410 and will not be repeated here.

[0102] S420, in the process of supplying power to the first load, obtaining a capacity parameter of the first battery pack.

[0103] Among them, the specific content of the capacity parameter can be found in the relevant description of the above part of this application, and will not be repeated here.

[0104] In some embodiments, in order to reasonably control the power supply device, the capacity parameters of the first battery pack may be obtained at intervals of a preset time.

[0105] In some embodiments, if the capacity parameter is the capacity of the first battery pack, the BMS may obtain the voltage of the first battery pack, and then determine the capacity of the first battery pack according to the corresponding relationship between the voltage and the capacity.

[0106] In other embodiments, if the capacity parameter is the SOC of the first battery pack, the BMS may obtain the voltage of the first battery pack, and then estimate the SOC of the first battery pack by a discharge test method, an ampere-hour integration method, a Kalman filter method, a neural network method, or the like.

[0107] S430 , when the capacity parameter of the first battery pack is lower than a first preset capacity threshold, control the third DCDC converter to transfer the electric energy of the second battery pack to the first battery pack.

[0108] The size of the first preset capacity threshold can be set according to specific scenarios and actual needs, and there is no limitation on this.

[0109] The control method of the power supply device of an embodiment of the present invention can utilize the first battery pack to power the first load of the vehicle when the vehicle is in a parked state, and during the power supply process, if the capacity parameter of the first battery pack is lower than the first preset capacity threshold, the third DCDC converter can transfer the energy of the second battery pack to the first battery pack, so that when the first battery pack is powering the load, the first battery pack can be supplemented according to the capacity parameter of the first battery pack, thereby making the power supply strategy more flexible.

[0110] In some embodiments, in order to take into account the safety of the power supply device and reduce energy consumption, the BMS can be awakened at a preset interval to execute the above steps S410-S430. In other words, the BMS is in a dormant state by default. If a wake-up signal is received, the BMS is powered on and executes the above steps. After the execution is completed, the BMS enters the dormant state again.

[0111] In some embodiments, in order to further improve the flexibility of the power supply scheme, the control method of the power supply device further includes:

[0112] When the capacity parameter of the first battery pack is greater than or equal to the first preset capacity threshold, the third DCDC converter is controlled to stop working.

[0113] In one example, the third DCDC converter may be controlled to stop operating.

[0114] In addition, in addition to a method for controlling a power supply system when a vehicle is parked, the embodiment of the present application also provides a method for controlling a power supply device when the vehicle is driving. The following section will specifically describe the method in conjunction with the accompanying drawings.

[0115] Figure 5 FIG. 1 is a flow chart of another control method for a power supply device provided in an embodiment of the present application. Figure 5 As shown, the control method 500 of the power supply device includes S510 to S530. The execution subject of each step of the control method 500 of the power supply device can be a BMS.

[0116] S510, when the vehicle is in driving state, controlling the first battery pack of the vehicle to supply power to a first load of the vehicle, and controlling the first battery pack and the second battery pack of the vehicle to supply power to a second load.

[0117] In some embodiments, the driving status in the embodiments of the present application may indicate that the vehicle is in a normal driving state.

[0118] In some embodiments, if the power supply device further includes a first switch module and a second switch module. Figure 3 The specific implementation of S510 may include: controlling the first switch module 61 to be closed and the second switch module 62 to be closed.

[0119] In some embodiments, if the first switch module and the second switch module each include two transistors connected in series, a specific implementation of S510 may include: controlling two transistors in the second switch module to be turned on, and controlling the first transistor in the first switch module to be turned on.

[0120] For example, continue to refer to the above Figure 4 , a specific implementation of S510 may include: the third MOS transistor SW3 and the fourth MOS transistor SW4 are closed.

[0121] By controlling the conduction of the two transistors in the second switch module, a two-way flow of energy can be achieved. When the second load of the vehicle stops working under driving conditions, the electric energy output by the battery pack can flow back to the battery pack from the second load, thereby realizing energy recovery and improving the efficiency of electric energy utilization. For example, if the vehicle brakes or goes downhill during driving, the energy of the motor or generator can be returned to the battery pack, improving the utilization rate of electric energy.

[0122] In one embodiment, the closing mode of the first switch module can be further determined according to whether there is an external power supply device for supplying power to the first load. Exemplarily, the external charging device can be a charging device such as a charging pile or a vehicle charger. In a feasible implementation, it can be determined whether there is an external power supply device for supplying power to the first load by determining whether a charging gun is plugged into the charging port of the first load.

[0123] Specifically, the specific control steps of the first switch module may include the following step 1 and step 2.

[0124] Step 1: when it is determined that there is an external power supply device supplying power to the first load 71 , control the first transistor in the first switch module 61 to be turned on and the second transistor in the first switch module to be turned off.

[0125] For example, continue to refer to the above Figure 4 The specific implementation of S510 may include: controlling the first MOS transistor SW1 to be closed, and controlling the second MOS transistor SW2 to be opened.

[0126] In this example, the first transistor can be unidirectionally conducted, that is, current can flow from the first battery pack to the first load, but cannot flow from the first load to the first battery pack. Through this example, when the external power supply device charges the first load, the current of the external power supply device will not flow into the first battery pack, thereby ensuring the safety of the first battery pack. When the external power supply device fails, the current of the first battery pack can pass through the drain-source electrode of the first transistor of the first switch module and the body diode of the second transistor in sequence to supply power to the first load. Thus, even when the external power supply device fails, the normal operation of the vehicle can be guaranteed, thereby improving the safety of the vehicle.

[0127] Step 2: When it is determined that there is no external power supply device to supply power to the first load, control the first transistor and the second transistor in the first switch module to be turned on.

[0128] For example, continue to refer to the above Figure 4 The specific implementation of S510 may include: controlling the first MOS transistor SW1 and the second MOS transistor SW2 to be closed.

[0129] In this embodiment, when the first transistor and the second transistor in the first switch module are both in a closed state, current can pass through the source and drain of the two transistors, thereby reducing energy loss of the body diode and improving power supply efficiency.

[0130] Accordingly, through the above two steps, the corresponding switch control strategy can be selected according to whether there is an external power supply device for powering the first load, thereby ensuring the safety of the vehicle while taking into account the power supply efficiency, thereby improving the flexibility of the overall control scheme.

[0131] In some embodiments, the BMS can obtain the vehicle status through the vehicle controller.

[0132] At this time, the specific implementation of S510 may include:

[0133] Step 3: Receive notification information sent by the vehicle controller of the vehicle.

[0134] It should be noted that the implementation of step three is similar to the specific content of step one in S410, and will not be repeated here.

[0135] Step 4: If the notification information indicates that the vehicle is in a driving state, in response to the notification information, the first battery pack is controlled to supply power to the first load, and the first battery pack and the second battery pack are controlled to stop supplying power to the second load.

[0136] The specific content of step 4 is similar to the above-mentioned specific implementation of S510 and will not be repeated here.

[0137] S520, in the process of supplying power to the first load and the second load, obtaining a capacity parameter of the first battery pack and a capacity parameter of the second battery pack.

[0138] The specific implementation of S520 is similar to that of S420 and will not be repeated here.

[0139] S530, when the absolute value of the difference between the capacity parameter of the first battery pack and the capacity parameter of the second battery pack is greater than a preset threshold, control the third DCDC converter to transfer the electric energy of the high-capacity battery pack to the low-capacity battery pack. The high-capacity battery pack is the battery pack with a higher capacity parameter between the first battery pack and the second battery pack, and the low-capacity battery pack is the battery pack with a lower capacity parameter between the first battery pack and the second battery pack of the vehicle.

[0140] That is to say, there are two situations for S530:

[0141] In the first case, if the capacity parameter of the first battery pack is greater than the capacity parameter of the second battery pack, and the difference between the two is greater than a preset threshold, the third DCDC converter is controlled to transfer the electric energy of the first battery pack to the second battery pack.

[0142] In the second case, if the capacity parameter of the second battery pack is greater than the capacity parameter of the first battery pack, and the difference between the two is greater than a preset threshold, the third DCDC converter is controlled to transfer the electric energy of the first battery pack to the second battery pack.

[0143] For example, during vehicle driving, the capacity of the first battery pack is greater than that of the second battery pack, and the power of the second battery pack is often consumed faster. When the BMS determines that the difference in capacity parameters between the first battery pack and the second battery pack is greater than a preset threshold, the first battery pack can be used to supplement the power of the second battery pack.

[0144] The control method of the power supply device of the embodiment of the present invention can use the first battery pack to power the first load of the vehicle when the vehicle is in a driving state, and use the first battery pack and the second battery pack to power the second load. In the power supply process, the third DCDC converter can supplement the power between the first battery pack and the second battery pack according to the capacity parameters of the first battery pack and the second battery pack, balancing the power of the two, thereby making the power supply strategy more flexible.

[0145] In some embodiments, in order to further improve the flexibility of the power supply scheme, the control method of the power supply device further includes:

[0146] When the absolute difference is less than or equal to the preset threshold, the third DCDC converter is controlled to stop working.

[0147] In one example, the third DCDC converter may be controlled to stop operating.

[0148] Based on the same application concept, in addition to providing a control method for a power supply device used when a vehicle is in a parked state, the embodiment of the present application also provides a corresponding BMS.

[0149] The BMS according to the embodiment of the present application is described in detail below with reference to the accompanying drawings.

[0150] Figure 6 Schematic diagram of the structure of a BMS provided in the embodiment of the present application. Figure 6 As shown, the BMS 54 includes a first control module 541 , a first parameter acquisition module 542 and a second control module 543 .

[0151] The first control module 541 is used to control the first battery pack of the power supply device to supply power to the first load of the vehicle, and control the first battery pack and the second battery pack of the power supply device to stop supplying power to the second load of the vehicle when the vehicle is in a parked state;

[0152] A first parameter acquisition module 542, used to acquire a capacity parameter of the first battery pack in the process of supplying power to the first load;

[0153] The second control module 543 is used to control the third DCDC converter to transfer the electric energy of the second battery pack to the first battery pack when the capacity parameter of the first battery pack is lower than the first preset capacity threshold.

[0154] In some embodiments of the present application, the first load includes low-voltage electrical components of the vehicle; the second load includes a motor of the vehicle and / or an engine of the vehicle.

[0155] In some embodiments of the present application, the first control module 541 specifically includes:

[0156] A receiving unit, used for receiving notification information sent by a vehicle controller of the vehicle;

[0157] The control unit is used to control the first battery pack to supply power to the first load and control the first battery pack and the second battery pack to stop supplying power to the second load in response to the notification information when the notification information indicates that the vehicle is in a parked state.

[0158] In some embodiments of the present application, the device further comprises:

[0159] The fifth control module is used to control the third DCDC converter to stop working when the capacity parameter of the first battery pack is greater than or equal to a first preset capacity threshold.

[0160] In some embodiments of the present application, the power supply device further includes: a first switch module and a second switch module,

[0161] The positive electrode of the first battery pack is connected to the negative electrode of the second battery pack, the positive electrode of the first battery pack is also connected to one end of the first load through the first switch module, the negative electrode of the first battery pack is connected to the first reference potential, and the other end of the first load is connected to the second reference potential.

[0162] The positive electrode of the second battery pack is connected to one end of the second load through the second switch module, wherein the other end of the second load is connected to the third reference potential.

[0163] One end of the third DCDC converter is connected to the positive electrode of the first battery pack, and the other end of the third DCDC converter is connected to the positive electrode of the second battery pack.

[0164] Accordingly, the first control module 541 is specifically configured to:

[0165] The first switch module is controlled to be turned on, and the second switch module is controlled to be turned off.

[0166] In some embodiments of the present application, the first switch module and the second switch module each include two transistors connected in series, and the sources of the two transistors connected in series are connected; wherein each transistor is connected to a body diode, the source of each transistor is connected to the anode of the corresponding body diode, and the drain of each transistor is connected to the cathode of the corresponding body diode, wherein the drain of the first transistor is connected to the positive electrode of the first battery pack;

[0167] Correspondingly, the first control module 541 is specifically used to control the two transistors in the first switch module to be turned on, and control the two transistors in the second switch module to be turned off.

[0168] The battery management system of an embodiment of the present invention can utilize the first battery pack to power a first load of the vehicle when the vehicle is in a parked state, and during this power supply process, if the capacity parameter of the first battery pack is lower than a first preset capacity threshold, the third DCDC converter can transfer energy from the second battery pack to the first battery pack, so that during the process of the first battery pack powering the load, the first battery pack can be recharged according to the capacity parameter of the first battery pack, thereby making the power supply strategy more flexible.

[0169] Other details of the BMS according to the embodiment of the present application are combined with the above Figure 4 The control method of the power supply device described in the example shown is similar and can achieve its corresponding technical effect. For the sake of brevity, it will not be repeated here.

[0170] Based on the same application concept, in addition to providing a control method for a power supply device used when a vehicle is in a driving state, the embodiment of the present application also provides a corresponding BMS.

[0171] The BMS according to the embodiment of the present application is described in detail below with reference to the accompanying drawings.

[0172] Figure 7 Schematic diagram of another BMS structure provided by the embodiment of the present application. Figure 7 As shown, the BMS 54 includes a third control module 544 , a second parameter acquisition module 545 and a fourth control module 546 .

[0173] The third control module 544 is used to control the first battery pack of the vehicle to supply power to the first load of the vehicle, and control the first battery pack and the second battery pack of the vehicle to supply power to the second load when the vehicle is in a driving state;

[0174] A second parameter acquisition module 545, used to acquire the capacity parameter of the first battery pack and the capacity parameter of the second battery pack in the process of supplying power to the first load and the second load;

[0175] The fourth control module 546 is used to control the third DCDC converter to transfer the electric energy of the high-capacity battery pack to the low-capacity battery pack when the absolute difference between the capacity parameter of the first battery pack and the capacity parameter of the second battery pack is greater than a preset threshold value,

[0176] Among them, the high-capacity battery pack is a battery pack with a higher capacity parameter among the first battery pack and the second battery pack, and the low-capacity battery pack is a battery pack with a lower capacity parameter among the first battery pack and the second battery pack of the vehicle.

[0177] In some embodiments of the present application, the first load includes low-voltage electrical components of the vehicle; the second load includes a motor of the vehicle and / or an engine of the vehicle.

[0178] In some embodiments of the present application, the third control module 544 specifically includes:

[0179] A receiving unit, used for receiving notification information sent by the vehicle controller;

[0180] The first control unit is used to control the first battery pack to supply power to the first load and control the first battery pack and the second battery pack to supply power to the second load in response to the notification information if the notification information indicates that the vehicle is in a driving state.

[0181] In some embodiments of the present application, the device further comprises:

[0182] The sixth control module is used to control the third DCDC converter to stop working when the absolute difference is less than or equal to a preset threshold.

[0183] In some embodiments of the present application, the power supply device further includes: a first switch module and a second switch module,

[0184] The positive electrode of the first battery pack is connected to the negative electrode of the second battery pack, the positive electrode of the first battery pack is also connected to one end of the first load through the first switch module, the negative electrode of the first battery pack is connected to the first reference potential, and the other end of the first load is connected to the second reference potential.

[0185] The positive electrode of the second battery pack is connected to one end of the second load through the second switch module, wherein the other end of the second load is connected to the third reference potential.

[0186] One end of the third DCDC converter is connected to the positive electrode of the first battery pack, and the other end of the third DCDC converter is connected to the positive electrode of the second battery pack;

[0187] Correspondingly, the third control module 544 is specifically used to control the first switch module to be turned on, and control the second switch module to be turned on.

[0188] In some embodiments of the present application, the first switch module and the second switch module each include two transistors connected in series, and the sources of the two transistors connected in series are connected; wherein each transistor is connected to a body diode, the source of each transistor is connected to the anode of the corresponding body diode, and the drain of each transistor is connected to the cathode of the corresponding body diode, wherein the drain of the first transistor is connected to the positive electrode of the first battery pack;

[0189] Correspondingly, the third control module 544 is specifically used to control the two transistors in the second switch module to be turned on, and control the first transistor in the first switch module to be turned on.

[0190] In some embodiments of the present application, the third control module 544 specifically includes:

[0191] The second control unit is used to control the first transistor in the first switch module to be turned on and the second transistor in the first switch module to be turned off when it is determined that there is an external power supply device to supply power to the first load.

[0192] The third control unit is used to control the first transistor in the first switch module to be turned on and the second transistor to be turned off when it is determined that there is no external power supply device to supply power to the first load.

[0193] The BMS of the embodiment of the present invention can use the first battery pack to power the first load of the vehicle when the vehicle is in driving state, and use the first battery pack and the second battery pack to power the second load. In the power supply process, the third DCDC converter can supplement power between the two battery packs according to the capacity parameters of the first battery pack and the capacity parameters of the second battery pack, and balance the power of the two, so as to make the power supply strategy more flexible.

[0194] Other details of the BMS according to the embodiment of the present application are combined with the above Figure 5 The control method of the power supply device described in the example shown is similar and can achieve its corresponding technical effect. For the sake of brevity, it will not be repeated here.

[0195] Figure 8 A schematic diagram of the hardware structure of a BMS provided in an embodiment of the present invention is shown.

[0196] The BMS may include a processor 801 and a memory 802 storing computer program instructions.

[0197] Specifically, the processor 801 may include a central processing unit (CPU), or an application specific integrated circuit (ASIC), or may be configured to implement one or more integrated circuits of the embodiment of the present invention.

[0198] The memory 802 may include a large capacity memory for data or instructions. By way of example and not limitation, the memory 802 may include a hard disk drive (HDD), a floppy disk drive, a flash memory, an optical disk, a magneto-optical disk, a tape, or a universal serial bus (USB) drive, or a combination of two or more of these. Where appropriate, the memory 802 may include a removable or non-removable (or fixed) medium. Where appropriate, the memory 802 may be inside or outside the BMS. In a particular embodiment, the memory 302 is a non-volatile solid-state memory.

[0199] The memory may include read-only memory (ROM), random access memory (RAM), magnetic disk storage media devices, optical storage media devices, flash memory devices, electrical, optical or other physical / tangible memory storage devices. Thus, typically, the memory includes one or more tangible (non-transitory) computer-readable storage media (e.g., memory devices) encoded with software including computer-executable instructions, and when the software is executed (e.g., by one or more processors), it is operable to perform the operations described with reference to the method according to an aspect of the present disclosure.

[0200] The processor 801 implements any one of the control methods for the power supply device in the above embodiments by reading and executing the computer program instructions stored in the memory 802 .

[0201] In one example, the BMS may further include a communication interface 803 and a bus 810. Figure 8 As shown, the processor 801, the memory 802, and the communication interface 803 are connected via a bus 810 and communicate with each other.

[0202] The communication interface 803 is mainly used to implement communication between various modules, devices, units and / or equipment in the embodiment of the present invention.

[0203] Bus 810 includes hardware, software or both, and the components of online data flow billing equipment are coupled to each other. For example, but not limitation, bus may include accelerated graphics port (AGP) or other graphics bus, enhanced industrial standard architecture (EISA) bus, front-side bus (FSB), hypertransport (HT) interconnection, industrial standard architecture (ISA) bus, infinite bandwidth interconnection, low pin count (LPC) bus, memory bus, micro channel architecture (MCA) bus, peripheral component interconnection (PCI) bus, PCI-Express (PCI-X) bus, serial advanced technology attachment (SATA) bus, video electronics standard association local (VLB) bus or other suitable bus or two or more of these combinations. In appropriate cases, bus 310 may include one or more buses. Although the embodiment of the present invention describes and shows a specific bus, the present invention considers any suitable bus or interconnection.

[0204] The BMS can execute the control method of the power supply device in the embodiment of the present invention, thereby realizing the combination Figure 4 and Figure 7 A control method for a power supply device and a BMS are described.

[0205] In addition, in combination with the control method of the power supply device in the above embodiment, the embodiment of the present invention can provide a computer storage medium for implementation. The computer storage medium stores computer program instructions; when the computer program instructions are executed by the processor, any of the control methods of the power supply device in the above embodiment is implemented.

[0206] It should be clear that the present invention is not limited to the specific configuration and processing described above and shown in the figures. For the sake of simplicity, a detailed description of the known method is omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of the present invention is not limited to the specific steps described and shown, and those skilled in the art can make various changes, modifications and additions, or change the order between the steps after understanding the spirit of the present invention.

[0207] The functional blocks shown in the above block diagram can be implemented as hardware, software, firmware or a combination thereof. When implemented in hardware, it can be, for example, an electronic circuit, an application specific integrated circuit (ASIC), appropriate firmware, a plug-in, a function card, etc. When implemented in software, the elements of the present invention are programs or code segments that are used to perform the required tasks. Programs or code segments can be stored in machine-readable media, or transmitted on a transmission medium or a communication link by a data signal carried in a carrier wave. "Machine-readable media" can include any medium capable of storing or transmitting information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, optical fiber media, radio frequency (RF) links, etc. Code segments can be downloaded via computer networks such as the Internet, intranets, etc.

[0208] It should also be noted that the exemplary embodiments mentioned in the present invention describe some methods or systems based on a series of steps or devices. However, the present invention is not limited to the order of the above steps, that is, the steps can be performed in the order mentioned in the embodiments, or in a different order from the embodiments, or several steps can be performed simultaneously.

[0209] Aspects of the present disclosure are described above with reference to the flowchart and / or block diagram of the method, device, equipment and computer program product according to the embodiment of the present disclosure. It should be understood that each box in the flowchart and / or block diagram and the combination of each box in the flowchart and / or block diagram can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device to produce a machine so that these instructions executed by the processor of the computer or other programmable data processing device enable the implementation of the function / action specified in one or more boxes of the flowchart and / or block diagram. Such a processor can be, but is not limited to, a general-purpose processor, a special-purpose processor, a special application processor, or a field programmable logic circuit. It can also be understood that each box in the block diagram and / or flowchart and the combination of boxes in the block diagram and / or flowchart can also be implemented by dedicated hardware that performs a specified function or action, or can be implemented by a combination of dedicated hardware and computer instructions.

[0210] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A control method for a power supply device, characterized in that: The power supply device includes a first battery pack, a second battery pack and a DC converter; The control method is applied to a battery management system BMS of a vehicle, comprising: When the vehicle is in a parked state, controlling the first battery pack to supply power to a first load of the vehicle, and controlling the first battery pack and the second battery pack to stop supplying power to a second load of the vehicle; In the process of supplying power to the first load, obtaining a capacity parameter of the first battery pack; When the capacity parameter of the first battery group is lower than a first preset capacity threshold, the DC converter is controlled to transfer the electric energy of the second battery group to the first battery group, and the first battery group is controlled to supply power to the first load.

2. The method according to claim 1, characterized in that: The first load includes low-voltage electrical components of the vehicle; The second load includes an electric machine of the vehicle and / or an engine of the vehicle.

3. The method according to claim 1, characterized in that The controlling the first battery pack to supply power to the first load of the vehicle, and controlling the first battery pack and the second battery pack to stop supplying power to the second load of the vehicle specifically includes: Receiving notification information sent by a vehicle controller of the vehicle; When the notification information indicates that the vehicle is in a parked state, in response to the notification information, the first battery pack is controlled to supply power to the first load, and the first battery pack and the second battery pack are controlled to stop supplying power to the second load.

4. The method according to claim 1, characterized in that After obtaining the capacity parameter of the first battery pack, the method further includes: When the capacity parameter of the first battery pack is greater than or equal to a first preset capacity threshold, the DC converter is controlled to stop working.

5. The method according to claim 1, characterized in that The power supply device further includes: a first switch module and a second switch module, wherein the positive electrode of the first battery pack is connected to the negative electrode of the second battery pack, the positive electrode of the first battery pack is also connected to one end of the first load through the first switch module, the negative electrode of the first battery pack is connected to a first reference potential, wherein the other end of the first load is connected to a second reference potential, The positive electrode of the second battery pack is connected to one end of the second load through the second switch module, wherein the other end of the second load is connected to a third reference potential. One end of the DC converter is connected to the positive electrode of the first battery pack, and the other end of the DC converter is connected to the positive electrode of the second battery pack; The controlling the first battery pack of the power supply device to supply power to the first load of the vehicle, and controlling the first battery pack and the second battery pack of the power supply device to stop supplying power to the second load of the vehicle, comprises: The first switch module is controlled to be turned on, and the second switch module is controlled to be turned off.

6. The method according to claim 5, characterized in that The first switch module and the second switch module each include two transistors connected in series, and the sources of the two transistors connected in series are connected; wherein each of the transistors is connected to a body diode, the source of each of the transistors is connected to the anode of the corresponding body diode, and the drain of each of the transistors is connected to the cathode of the corresponding body diode, wherein the drain of the first transistor in the first switch module is connected to the positive electrode of the first battery pack; The controlling the first switch module to be turned on and the controlling the second switch module to be turned off specifically includes: The two transistors in the first switch module are controlled to be turned on, and the two transistors in the second switch module are controlled to be turned off.

7. The method according to any one of claims 1 to 6, characterized in that: The number of the DC converter in the power supply device is 1.

8. A control method for a power supply device, characterized in that: The power supply device includes a first battery pack, a second battery pack and a DC converter; The control method is applied to a battery management system BMS of a vehicle, comprising: When the vehicle is in a driving state, controlling the first battery pack to supply power to a first load of the vehicle, and controlling the first battery pack and the second battery pack to supply power to a second load of the vehicle; In the process of supplying power to the first load and the second load, obtaining a capacity parameter of the first battery pack and a capacity parameter of the second battery pack; When the absolute value of the difference between the capacity parameter of the first battery pack and the capacity parameter of the second battery pack is greater than a preset threshold, the DC converter is controlled to transfer the electric energy of the high-capacity battery pack to the low-capacity battery pack, The high-capacity battery pack is a battery pack having a higher capacity parameter between the first battery pack and the second battery pack, and the low-capacity battery pack is a battery pack having a lower capacity parameter between the first battery pack and the second battery pack of the vehicle.

9. The method according to claim 8, characterized in that The first load includes low-voltage electrical components of the vehicle; The second load includes an electric machine of the vehicle and / or an engine of the vehicle.

10. The method according to claim 8, characterized in that The controlling the first battery pack of the vehicle to supply power to a first load of the vehicle, and controlling the first battery pack and the second battery pack of the vehicle to supply power to a second load, comprises: Receive notification information sent by the vehicle controller; If the notification information indicates that the vehicle is in a driving state, in response to the notification information, the first battery pack is controlled to supply power to the first load, and the first battery pack and the second battery pack are controlled to supply power to the second load.

11. The method according to claim 8, characterized in that After acquiring the capacity parameter of the first battery pack and the capacity parameter of the second battery pack, the method further includes: When the absolute difference is less than or equal to the preset threshold, the DC converter is controlled to stop working.

12. The method according to claim 8, characterized in that The power supply device further includes: a first switch module and a second switch module, The positive electrode of the first battery pack is connected to the negative electrode of the second battery pack, the positive electrode of the first battery pack is also connected to one end of the first load through the first switch module, the negative electrode of the first battery pack is connected to a first reference potential, and the other end of the first load is connected to a second reference potential. The positive electrode of the second battery pack is connected to one end of the second load through the second switch module, wherein the other end of the second load is connected to a third reference potential. One end of the DC converter is connected to the positive electrode of the first battery pack, and the other end of the DC converter is connected to the positive electrode of the second battery pack; The controlling the first battery pack of the vehicle to supply power to a first load of the vehicle, and controlling the first battery pack and the second battery pack of the vehicle to supply power to a second load, comprises: The first switch module is controlled to be turned on, and the second switch module is controlled to be turned on.

13. The method according to claim 12, characterized in that The first switch module and the second switch module each include two transistors connected in series, and the sources of the two transistors connected in series are connected; wherein each of the transistors is connected to a body diode, the source of each of the transistors is connected to the anode of the corresponding body diode, and the drain of each of the transistors is connected to the cathode of the corresponding body diode, wherein the drain of the first transistor in the first switch module is connected to the positive electrode of the first battery pack; The controlling the first switch module to be turned on and the controlling the second switch module to be turned on specifically include: The two transistors in the second switch module are controlled to be turned on, and the first transistor in the first switch module is controlled to be turned on.

14. The method according to claim 13, characterized in that The controlling the first transistor in the first switch module to be turned on specifically includes: When it is determined that there is an external power supply device supplying power to the first load, controlling the first transistor in the first switch module to be turned on and the second transistor in the first switch module to be turned off; When it is determined that there is no external power supply device to supply power to the first load, the first transistor in the first switch module is controlled to be turned on and the second transistor is controlled to be turned off.

15. The method according to any one of claims 8 to 14, characterized in that: The number of the DC converter in the power supply device is 1.

16. A battery management system BMS, characterized in that: The BMS is arranged in a vehicle, and the BMS comprises: a first control module, configured to control the first battery pack of the power supply device to supply power to a first load of the vehicle, and control the first battery pack and the second battery pack of the power supply device to stop supplying power to a second load of the vehicle when the vehicle is in a parked state; A first parameter acquisition module, used for acquiring a capacity parameter of the first battery pack in the process of supplying power to the first load; The second control module is used to control the DC converter to transfer the electric energy of the second battery group to the first battery group when the capacity parameter of the first battery group is lower than a first preset capacity threshold, and control the first battery group to supply power to the first load.

17. A battery management system BMS, characterized in that: The BMS is arranged in a vehicle, and the BMS comprises: A third control module is used to control the first battery pack of the vehicle to supply power to the first load of the vehicle, and control the first battery pack and the second battery pack of the vehicle to supply power to the second load when the vehicle is in a driving state; A second parameter acquisition module, used to acquire a capacity parameter of the first battery pack and a capacity parameter of the second battery pack in the process of supplying power to the first load and the second load; a fourth control module, configured to control the DC converter to transfer electric energy of the high-capacity battery pack to the low-capacity battery pack when the absolute difference between the capacity parameter of the first battery pack and the capacity parameter of the second battery pack is greater than a preset threshold, The high-capacity battery pack is a battery pack having a higher capacity parameter between the first battery pack and the second battery pack, and the low-capacity battery pack is a battery pack having a lower capacity parameter between the first battery pack and the second battery pack of the vehicle.

18. A power supply device, characterized in that: The device comprises: A first battery pack, wherein the positive electrode of the first battery pack is connected to the negative electrode of the second battery pack, the positive electrode of the first battery pack is further connected to one end of a first load through a first switch module, the negative electrode of the first battery pack is connected to a first reference potential, and the other end of the first load is connected to a second reference potential; The second battery pack, the positive electrode of the second battery pack is connected to one end of the second load through the second switch module, wherein the other end of the second load is connected to a third reference potential; a DC converter, one end of which is connected to the positive electrode of the first battery pack, and the other end of which is connected to the positive electrode of the second battery pack, and the DC converter is used to transfer energy between the first battery pack and the second battery pack according to a control signal; Wherein, when the vehicle is in a parked state and the capacity parameter of the first battery pack is lower than a first preset capacity threshold, the DC converter transmits the electric energy of the second battery pack to the first battery pack, and controls the first battery pack to supply power to the first load; When the vehicle is in a driving state and the absolute value of the difference between the capacity parameter of the first battery pack and the capacity parameter of the second battery pack is greater than a preset threshold, the DC converter transmits electric energy from the high-capacity battery pack to the low-capacity battery pack, wherein the high-capacity battery pack is the battery pack with a higher capacity parameter between the first battery pack and the second battery pack, and the low-capacity battery pack is the battery pack with a lower capacity parameter between the first battery pack and the second battery pack of the vehicle.

19. The device according to claim 18, characterized in that The first switch module and / or the second switch module each include two transistors connected in series, and the sources of the two transistors connected in series are connected; Each of the transistors is connected to a corresponding body diode, the source of each of the transistors is connected to the anode of the corresponding body diode, and the drain of each of the transistors is connected to the cathode of the corresponding body diode.

20. The device according to claim 18 or 19, characterized in that The number of the DC converter in the power supply device is 1.

21. A battery management system BMS, characterized in that: The battery management system comprises: A processor and a memory storing computer program instructions; when the processor executes the computer program instructions, the control method according to any one of claims 1 to 15 is implemented.

22. A computer storage medium, characterized in that The computer storage medium stores computer program instructions, and when the computer program instructions are executed by the processor, the control method according to any one of claims 1 to 15 is implemented.

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