A vehicle power supply system, control method, and vehicle

Abstract

The application relates to the technical field of electric vehicles, and provides a vehicle power supply system, a control method and a vehicle. The vehicle power supply system comprises a power supply, a low-voltage power supply, a charging system and a control unit. The power supply is electrically connected with high-voltage electrical devices through a high-voltage circuit; the low-voltage power supply is connected in series with the power supply and is electrically connected with low-voltage electrical devices through a low-voltage circuit; the charging system, the power supply and the low-voltage power supply are connected in series on a charging circuit, and a first switch is arranged between the power supply and the low-voltage power supply; a switching circuit on the charging circuit is connected with the charging system and the power supply, and is connected in parallel with the first switch and the low-voltage power supply; and the control unit is used for controlling the connection and disconnection of the high-voltage circuit, the charging circuit, the first switch and the switching circuit. The vehicle power supply system is provided with the power supply and the low-voltage power supply which can independently supply power to the high-voltage electrical devices and the low-voltage electrical devices, so that the weight of the whole vehicle is reduced and the manufacturing cost of the whole vehicle is lowered.

Description

Technical Field

[0001] This application relates to the field of electric vehicle technology, specifically to a vehicle power system, control method, and vehicle. Background Technology

[0002] Currently, the power systems of new energy vehicles generally use lead-acid batteries as energy storage devices for the low-voltage power supply system. During normal vehicle operation, the high-voltage power supply system is connected in parallel with the lead-acid battery through a step-down DC / DC converter, thus charging the lead-acid battery while supplying power to the low-voltage electrical components. After the vehicle stops operating, all low-voltage electrical components are powered by the lead-acid battery.

[0003] However, in the aforementioned parallel power circuit structure, the low mass and volumetric energy density of lead-acid batteries can lead to over-discharge during prolonged power supply, resulting in a short battery life and requiring replacement every two to three years. Furthermore, a DC / DC converter is required to efficiently supply power to both high-voltage and low-voltage electrical components simultaneously during vehicle operation. The presence of the DC / DC converter and wiring harnesses in the circuit increases the overall vehicle weight and cost, making it increasingly difficult for the vehicle to meet the demands for lightweight design and compact layout.

[0004] Therefore, there is a need to provide a vehicle power supply system, control method, and vehicle, in which a power supply and a low-voltage power supply are set up independently, and the two supply power to high-voltage and low-voltage electrical devices respectively, so as to reduce the weight of the power supply system and solve the above problems. Summary of the Invention

[0005] In view of the shortcomings of the prior art described above, the present invention provides a vehicle power system, a control method, and a vehicle. The vehicle power system independently sets up a power supply and a low-voltage power supply, eliminating the need for a DC / DC converter and related wiring. This solves the technical problems of existing vehicle power systems, which, in order to efficiently supply power to both high-voltage and low-voltage electrical components simultaneously during vehicle operation, use a DC / DC converter to connect the high-voltage power supply system in parallel with the lead-acid battery. This results in complex overall vehicle power wiring, excessive weight, and low energy density and short service life of the parallel low-voltage power supply system.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] The present invention provides a vehicle power system, the wheel power system comprising a power source, a low-voltage power source, a charging system, and a control unit.

[0008] The system comprises a power supply connected to high-voltage electrical components via a high-voltage circuit; a low-voltage power supply connected in series with the power supply and connected to low-voltage electrical components via a low-voltage circuit; a charging system, the power supply, and the low-voltage power supply connected in series in a charging circuit; a first switch connected between the power supply and the low-voltage power supply; a switching circuit connected to the charging system and the power supply, and connected in parallel with the first switch and the low-voltage power supply; and a control unit controlling the connection and disconnection of the high-voltage circuit, the charging circuit, the first switch, and the switching circuit; so that when the switching circuit is connected to the charging circuit, the charging system charges the power supply alone; and when the switching circuit is disconnected and the charging circuit is connected, the charging system charges both the power supply and the low-voltage power supply simultaneously.

[0009] In one embodiment of the present invention, the power source includes a plurality of power batteries connected in series, and the low-voltage power source includes a plurality of lithium batteries connected in series; within the vehicle's driving range, the voltage of each individual lithium battery in the low-voltage power source is greater than or equal to the voltage of each individual power battery in the power source.

[0010] In one embodiment of the present invention, during the charging process, when the voltage of the power battery is less than the voltage of the lithium battery, the control unit controls the charging circuit and the switching circuit to connect, so as to drive the charging system to connect with the power source, and the charging system charges the power source; when the voltage of the power battery is equal to the voltage of the lithium battery, the control unit controls the charging circuit to connect and the switching circuit to disconnect, so as to drive the charging system to connect with the power source and the low-voltage power source, and the charging system charges the power source and the low-voltage power source.

[0011] In one embodiment of the present invention, the charging circuit connected between the charging system and the positive terminal of the power supply includes a first circuit and a second circuit connected in parallel. The first circuit is connected in series with a second switch, and the second circuit is connected in series with a third switch and a protection resistor.

[0012] In one embodiment of the present invention, the high-voltage circuit is connected in series with a third switch and a protective resistor on the second circuit.

[0013] In one embodiment of the present invention, when the charging system charges the power source and / or low-voltage power source, the control unit first controls the third switch to be turned on, and then the control unit controls the second switch to be turned on.

[0014] In one embodiment of the present invention, a fourth switch is provided on the switching circuit, and a fifth switch is provided on the charging circuit connected between the charging system and the negative terminal of the low-voltage power supply.

[0015] In one embodiment of the present invention, the control unit acquires the voltage of each individual lithium battery in the low-voltage power supply through a signal acquisition circuit. The signal acquisition circuit is connected to the positive and negative terminals of the low-voltage power supply. The signal acquisition circuit connects multiple equalizing resistors in series between the positive and negative terminals of the low-voltage power supply, and connects the multiple equalizing resistors sequentially to the corresponding terminals of the lithium battery through a switching circuit.

[0016] On the other hand, the present invention provides a control method for a vehicle power system, the control method for the vehicle power system comprising:

[0017] During charging:

[0018] When the control unit detects that the voltage of a single power battery in the power source is lower than the voltage of a single lithium battery in the low-voltage power source, the control unit controls the connection of the charging circuit and the switching circuit, drives the charging system to connect with the power source through the charging circuit and the switching circuit, and enables the charging system to charge the power source.

[0019] When the control unit monitors that the voltage of a single power battery in the power source is equal to the voltage of a single lithium battery in the low-voltage power source, the control unit adjusts the charging circuit to be turned on and the switching circuit to be turned off, driving the charging system to be connected to the power source and the low-voltage power source through the charging circuit, and enabling the charging system to charge the power source and the low-voltage power source until the power source and the low-voltage power source are fully charged.

[0020] On the other hand, the present invention provides a vehicle in which a vehicle power system as described in any of the above embodiments is provided.

[0021] The beneficial effects of the present invention are as follows: The vehicle power supply system, control method and vehicle provided by the present invention have a power supply and a low voltage power supply connected in series in the vehicle power supply system. When the vehicle is running, the power supply and the low voltage power supply are used to independently supply power to the high voltage electrical components and the low voltage electrical components, respectively.

[0022] Furthermore, during the charging process, the control unit regulates the on / off state of the charging circuit and the switching circuit on the charging circuit based on the voltage of the individual batteries in the power supply and the low-voltage power supply, driving the charging system to charge the power supply alone, or driving the charging system to charge the power supply and the low-voltage power supply together when the individual batteries in the power supply and the low-voltage power supply are at the same voltage, thereby realizing safe and efficient charging of the power supply system in series with the power supply and the low-voltage power supply.

[0023] In summary, the vehicle power system, control method, and vehicle provided by this invention include a power supply and a low-voltage power supply that can independently supply power to high-voltage and low-voltage electrical components. The power system utilizes a series charging circuit and a parallel switching circuit to achieve efficient and safe charging of the power supply and low-voltage power supply. Compared to existing technologies, this eliminates the need for DC / DC converters and related wiring, effectively increasing the capacity and lifespan of the low-voltage power supply in the power system, reducing the overall vehicle weight, and lowering the overall vehicle manufacturing cost.

[0024] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0025] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. In the drawings:

[0026] Figure 1 This is a schematic diagram of the circuit structure of a vehicle power system, as illustrated in an exemplary embodiment of this application.

[0027] Component designation explanation

[0028] 100 Power supply; 200 Low-voltage power supply; 300 Control unit; 310 Chipset; 320 Signal acquisition circuit; 400 Charging system; 500 High-voltage electrical components; 600 Low-voltage electrical components; 10 High-voltage circuit; 20 Low-voltage circuit; 30 First charging circuit; 31 First circuit; 32 Second circuit; 40 Second charging circuit; 50 Third charging circuit; 60 Switching circuit; S1 First switch; S2 Second switch; S3 Third switch; S4 Fourth switch; S5 Fifth switch; R1 Protective resistor; Rn Equalizing resistor; Qn Switching circuit. Detailed Implementation

[0029] The embodiments of the present invention will be described below with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention and not for limiting the scope of protection of the present invention.

[0030] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0031] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the invention. However, it will be apparent to those skilled in the art that embodiments of the invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the invention.

[0032] Please see Figure 1 This invention provides a vehicle power system, a control method, and a vehicle. The vehicle power system independently sets up a power supply and a low-voltage power supply, eliminating the need for a DC / DC converter and related wiring. This solves the technical problems of existing vehicle power systems that, in order to efficiently supply power to both high-voltage and low-voltage electrical components simultaneously during vehicle operation, use a DC / DC converter to connect the high-voltage power supply system in parallel with the lead-acid battery. This results in complex overall vehicle power wiring, excessive weight, and low energy density and short lifespan of the parallel low-voltage power supply system.

[0033] like Figure 1 As shown, an embodiment of the present invention provides a vehicle power system, which includes: a power supply 100, a low-voltage power supply 200, a charging system 400, and a control unit 300.

[0034] like Figure 1 As shown, in the power supply system, the power supply 100 and the low-voltage power supply 200 are connected in series. A first switch S1 controlled by the control unit 300 is installed between the power supply 100 and the low-voltage power supply 200. The power supply 100 is electrically connected to the high-voltage electrical device 500 through the high-voltage circuit 10, and the low-voltage power supply 200 is electrically connected to the low-voltage electrical device 600 through the low-voltage circuit 20. The power supply 100 is composed of multiple individual power batteries connected in series, and the low-voltage power supply 200 is composed of multiple individual lithium batteries connected in series. The overall voltage of the power supply 100 is set to be greater than the overall voltage of the low-voltage power supply 200, and the voltage of each power battery in the power supply 100 is set to be less than or equal to the voltage of each individual lithium battery in the low-voltage power supply 200.

[0035] like Figure 1As shown, in the power supply system, the power supply 100, the low-voltage power supply 200, and the charging system 400 are connected in series in the charging circuit. The positive terminal of the charging system 400 is electrically connected to the positive terminal of the power supply 100 through a first charging circuit 30. The negative terminal of the power supply 100 is electrically connected to the positive terminal of the low-voltage power supply 200 through a second charging circuit 40. A first switch S1 between the power supply 100 and the low-voltage power supply 200 is located on the second charging circuit 40. The negative terminal of the low-voltage power supply 200 is electrically connected to the negative terminal of the charging system 400 through a third charging circuit 50. Furthermore, a switching circuit 60 is provided in the charging circuit. The switching circuit 60 is connected in series with the power supply 100 and the charging system 400 in the charging circuit, and is connected in parallel with the first switch S1 and the low-voltage power supply 200 in the charging circuit. Specifically, one end of the switching circuit 60 is electrically connected to the second charging circuit 40 between the first switch S1 and the power supply 100, and the other end of the switching circuit 60 is electrically connected to the negative terminal of the charging system 400.

[0036] like Figure 1 As shown, in the power system, the control unit 300 monitors the operating parameters of the power supply 100 and the low-voltage power supply 200, and adjusts the connection and disconnection of the high-voltage circuit 10, the charging circuit, the first switch S1, and the switching circuit 60 according to the vehicle's operating requirements and the power supply operating parameters to realize the corresponding power supply and charging functions of the power system. The operating parameters of the power supply 100 and the low-voltage power supply 200 include the overall voltage of the power supply 100, the overall voltage of the low-voltage power supply 200, the voltage of each individual power battery cell in the power supply 100, and the voltage of each individual lithium battery cell in the low-voltage power supply 200.

[0037] When the vehicle is in normal operation without charging, the control unit 300 controls the first switch S1 to open, causing the power supply 100 and low-voltage power supply 200 in the power system to operate as two independent power supply systems. The power supply 100 and low-voltage power supply 200 in the power system provide separate power to the high-voltage electrical components 500 and 600 in the vehicle, respectively. The low-voltage power supply 200 must store enough electricity to meet the power consumption of all low-voltage electrical components 600 in both the vehicle's silent and normal operating states. Specifically, during vehicle operation, the voltage of each lithium-ion cell in the low-voltage power supply 200 must be greater than or equal to the voltage of each power battery cell in the power supply 100. This ensures that even when the power supply 100 is depleted, the low-voltage power supply 200 can still supply power to the low-voltage electrical components 600 in the vehicle, and facilitates simultaneous charging of the power supply 100 and low-voltage power supply 200 via a series connection during charging.

[0038] When the vehicle is charging, after the low-voltage power supply 200 uses its remaining power to supply power to the control unit 300 and the low-voltage electrical components 600, the control unit 300 first performs an insulation test on the power supply 100. After the insulation test passes, the control unit 300 monitors the voltage of each individual battery in the power supply 100 and the low-voltage power supply 200, and controls the connection and disconnection of the first switch S1, the charging circuit and the switching circuit 60 based on the individual voltage parameters of each power battery in the power supply 100 and each lithium battery in the low-voltage power supply 200, so as to drive the charging system 400 to charge the power supply 100 alone or to charge the power supply 100 and the low-voltage power supply 200 together. For example, when the control unit 300 controls the switching circuit 60 and the charging circuit to be connected (i.e., the first charging circuit 30 and the switching circuit 60 are connected, and the first switch S1 is open), the charging system 400 is electrically connected to the power source 100 through the first charging circuit 30 and the switching circuit 60, and the charging system 400 can charge the power source 100 alone; when the control unit 300 controls the switching circuit 60 to be disconnected and the charging circuit to be connected (i.e., the first charging circuit 30, the second charging circuit 40 and the third charging circuit 50 are all connected), the charging system 400 is simultaneously connected in series with the power source 100 and the low-voltage power source 200 through the charging circuit, and the charging system 400 can charge the power source 100 and the low-voltage power source 200 together at the same time.

[0039] Specifically, during the charging process, when the control unit 300 monitors that the voltage of each individual power battery cell in the power source 100 is lower than the voltage of each individual lithium battery cell in the low-voltage power source 200, the control unit 300 controls the first charging circuit 30 and the switching circuit 60 to connect, thereby driving the charging system 400 to be electrically connected to the power source 100 through the first charging circuit 30 and the switching circuit 60, thus enabling the charging system 400 to charge the power source 100 independently; and when the control unit 300 monitors that the voltage of each individual power battery cell in the power source 100 has been charged to be equal to the voltage of each individual lithium battery cell in the low-voltage power source 200, the control unit 300 first controls the charging system 400 to stop charging the power source 100. During charging, the first charging circuit 30 and the switching circuit 60 are disconnected. Then, the control unit 300 controls the first charging circuit 30, the second charging circuit 40, and the third charging circuit 50 to connect, so that the charging system 400 is simultaneously connected in series with the power source 100 and the low-voltage power source 200 through the charging circuit. The charging system 400 can charge the power source 100 and the low-voltage power source 200 at the same time. When the control unit 300 monitors that the power source 100 and the low-voltage power source 200 are fully charged, the control unit 300 controls the charging circuit to disconnect, that is, controls the first charging circuit 30, the second charging circuit 40, and the third charging circuit 50 to disconnect, ending the entire charging process.

[0040] Furthermore, in some embodiments, the low-voltage power supply 200 is also electrically connected to an external electrical device via a power cord. When the low-voltage power supply 200 is severely depleted, and the voltage of a single lithium battery cell in the low-voltage power supply 200 is much lower than the voltage of a single power battery cell in the power supply 100, the low-voltage power supply 200 cannot be charged simultaneously with the power supply 100 in series, and the low-voltage power supply 200 needs to be charged separately. This can be achieved by connecting the low-voltage power supply 200 to the power network of an external electrical device via a power cord for independent charging.

[0041] like Figure 1 As shown, in some embodiments, the first charging circuit 30 is used to connect the positive terminal of the charging system 400 and the positive terminal of the power supply 100. The first charging circuit 30 includes a first circuit 31 and a second circuit 32 connected in parallel. A second switch S2 is provided on the first circuit 31, and a third switch S3 and a protection resistor R1 are provided in series on the second circuit 32. A fourth switch S4 is provided on the switching circuit 60. A fifth switch S5 is provided on the third charging circuit 50. In the power system, the control unit 300 controls the connection and disconnection of the corresponding first charging circuit 30, second charging circuit 40, switching circuit 60, and third charging circuit 50 by controlling the closing and opening of the first switch S1, second switch S2, third switch S3, fourth switch S4, and fifth switch S5.

[0042] It should be noted that the switch types of the first switch S1, the second switch S2, the third switch S3, the fourth switch S4, and the fifth switch S5 used in the power supply system are not limited. In one embodiment of the present invention, the first switch S1, the second switch S2, the third switch S3, the fourth switch S4, and the fifth switch S5 are relays.

[0043] like Figure 1As shown, in the above embodiment, when the charging system 400 needs to charge the power supply 100 and / or the low-voltage power supply 200, and the control unit 300 controls the first charging circuit 30 between the charging system 400 and the positive terminal of the power supply 100 to be connected, the control unit 300 first controls the third switch S3 to close, so that the charging system 400 is electrically connected to the power supply 100 through the second circuit 32 equipped with a protective resistor R1, in order to limit the current at the beginning of charging and avoid damage to the power supply caused by the surge in current at the beginning of charging; after the current stabilizes, the control unit 300 controls the third switch S3 to close, so that the charging system 400 is electrically connected to the power supply 100 through the second circuit 32 equipped with a protective resistor R1, thereby limiting the current at the beginning of charging and avoiding .... Unit 300 then controls the second switch S2 to close, connecting the first circuit 31 in parallel with the second circuit 32 that connects the charging system 400 and the positive terminal of the power supply 100. Since there is no resistor on the first circuit 31, the first circuit 31 short-circuits the second circuit 32 when connected in parallel, so that the charging system 400 is connected to the power supply 100 through the first circuit 31, thereby increasing the charging current of the charging circuit. Finally, the control unit 300 controls the third switch S3 to open, so that the first charging circuit 30 is connected to the charging system 400 and the power supply 100 solely through the first circuit 31.

[0044] For example, such as Figure 1 As shown, in the above embodiment, when the control system first controls the charging system 400 to charge the power source 100 separately, the control system first controls the first switch S1 and the fifth switch S5 to open, so as to disconnect the second charging circuit 40 and the third charging circuit 50, and controls the third switch S3 and the fourth switch S4 to close, so as to connect the switching circuit 60 and the second circuit 32 of the first charging circuit 30, so that the charging system 400 is connected to the power source 100 through the switching circuit 60 and the first charging circuit 30; then, after the current of the first charging circuit 30 stabilizes, the control unit 300 controls the second switch S2 to close, so as to connect the first circuit 31 in the first charging circuit 30 to replace the second circuit 32; finally, the control unit 300 controls the third switch S3 to open, so that the first charging circuit 30 is connected to the charging system 400 and the power source 100 separately by the first circuit 31.

[0045] When the control system switches the charging system 400 to charge the power source 100 and the low-voltage power source 200 together, the control unit 300 first controls the second switch S2 and the fourth switch S4 to open, thereby disconnecting the first charging circuit 30 and the switching circuit 60. Then, the control unit 300 controls the first switch S1, the third switch S3, and the fifth switch S5 to close, so that the entire charging circuit is connected in series (i.e., the first charging circuit 30, the second charging circuit 40, and the third charging circuit 50 are connected in series), thereby driving the charging system 400 to be connected in series with the power source 100 and the low-voltage power source 200 through the charging circuit. Subsequently, after the current in the first charging circuit 30 stabilizes, the control unit 300 controls the second switch S2 to close, so that the connection of the first circuit 31 in the first charging circuit 30 replaces the connection of the second circuit 32. Finally, the control unit 300 controls the third switch S3 to open, so that the first charging circuit 30 is connected to the charging system 400 and the power source 100 solely by the first circuit 31.

[0046] When the charging process is finished, the control unit 300 controls the first switch S1, the second switch S2, and the fifth switch S5 to open, so that the power supply 100 and the low-voltage power supply 200 independently supply power to the high-voltage electrical device 500 and the low-voltage electrical device 600, respectively.

[0047] like Figure 1 As shown, in the above embodiment, the high-voltage circuit 10 is connected in series with the third switch S3 and the protection resistor R1 on the second circuit 32. This allows the control unit 300 to control the connection and disconnection of the high-voltage circuit 10 by controlling the closing and opening of the third switch S3 when power is supplied, and enables the power supply 100 to protect the circuit through the protection resistor R1 when it is electrically connected to the high-voltage electrical device 500 through the high-voltage circuit 10.

[0048] like Figure 1 As shown, in some embodiments, the control unit 300 includes a chipset 310. The chipset 310, within the control unit 300, monitors the parameters of each individual battery cell in the power supply 100 and the low-voltage power supply 200. These battery parameters include the current, voltage, and temperature of each individual battery cell. The chipset 310 is connected in series across the power supply 100 to monitor the battery parameters of each power battery in the power supply 100. Simultaneously, the chipset 310 can also monitor the battery parameters of each lithium battery in the low-voltage power supply 200 via an external differential acquisition circuit.

[0049] Specifically, chipset 310 can be an AFE chipset 310. The individual AFE chips within the AFE chipset 310 communicate via a bidirectional daisy chain, with the first and last AFE chips connected to a bridge chip. The bridge chip is connected to the positive and negative terminals of the low-voltage power supply 200 via GPIO and signal acquisition circuit 320. Chipset 310 can monitor battery parameters and perform voltage balancing control on each individual lithium battery in the low-voltage power supply 200 through signal acquisition circuit 320. The two ends of signal acquisition circuit 320 are connected to the positive and negative terminals of low-voltage power supply 200, respectively. Multiple balancing resistors Rn are connected in series between the two ends of signal acquisition circuit 320 and low-voltage power supply 200. Each individual lithium battery in low-voltage power supply 200 has its positive and negative terminals connected in series with a balancing resistor Rn on signal acquisition circuit 320 via switching circuit Qn.

[0050] The chipset 310 of the control unit 300 monitors and balances the individual lithium battery voltages in the low-voltage power supply 200 by traversing the switching circuit Qn. The control unit 300 sequentially closes the switching circuit Qn across the positive and negative terminals of each individual lithium battery in the low-voltage power supply 200, connecting each individual lithium battery in the low-voltage power supply 200 to its corresponding balancing resistor Rn, thereby achieving voltage acquisition and passive balancing of each lithium battery in the low-voltage power supply 200. Specifically, the chipset 310 acquires the voltage of each lithium battery connected to the corresponding balancing resistor Rn through the signal acquisition circuit 320 to obtain the actual voltage of each lithium battery; furthermore, the control unit 300 calculates the average voltage V of all individual batteries, including those in the power supply 100 and the low-voltage power supply 200. 均 The circuit controls the connection of the switching circuit Qn across each of the 200 lithium batteries in the low-voltage power supply, thereby controlling the voltage of all individual batteries at V. 均 The control target is within the range of ±△V.

[0051] Furthermore, through CANFD communication via the bridge chip in chipset 310, control unit 300 can communicate with an external central domain controller. This means the power system connects to the outside world only through one set of power positive and negative wiring harnesses and one set of CANFD communication wiring harnesses, reducing vehicle weight and overall vehicle cost. Moreover, this communication method eliminates the need for an MCU chip in control unit 300, further reducing manufacturing costs.

[0052] In one embodiment of the present invention, the present invention also provides a control method for the vehicle power system described in any of the above embodiments, the control method comprising:

[0053] During the power supply process, the control unit 300 controls the first switch S1 to open and controls the high-voltage circuit 10 and the low-voltage circuit 20 to connect, so that the power supply 100 and the low-voltage power supply 200 independently supply power to the high-voltage electrical device 500 and the low-voltage electrical device 600 in the vehicle.

[0054] During the charging process, the control unit 300 adjusts the connection and disconnection of the first switch S1, the charging circuit and the switching circuit 60 based on the individual voltage parameters of each power battery in the power supply 100 and each lithium battery in the low-voltage power supply 200, so as to drive the charging system 400 to charge the power supply 100 alone or to charge the power supply 100 and the low-voltage power supply 200 together.

[0055] Specifically, when the control unit 300 monitors that the voltage of a single power battery in the power supply 100 is lower than the voltage of a single lithium battery in the low-voltage power supply 200, the control unit 300 controls the charging circuit and the switching circuit 60 to connect, thereby driving the charging system 400 to the power supply 100 through the charging circuit and the switching circuit 60, and causing the charging system 400 to charge the power supply 100.

[0056] When the control unit 300 monitors that the voltage of a single power battery in the power source 100 is equal to the voltage of a single lithium battery in the low-voltage power source 200, the control unit 300 controls the charging circuit to be turned on and the switching circuit 60 to be turned off, driving the charging system 400 to connect to the power source 100 and the low-voltage power source 200 through the charging circuit, and causing the charging system 400 to charge the power source 100 and the low-voltage power source 200 until the power source 100 and the low-voltage power source 200 are fully charged.

[0057] In one embodiment of the present invention, the present invention also provides a vehicle equipped with the vehicle power system described in any of the above embodiments, wherein the vehicle can independently supply power to the high-voltage electrical components and low-voltage electrical components inside the vehicle during operation.

[0058] The vehicle power system, control method, and vehicle provided by this invention have a power supply and a low-voltage power supply connected in series in the vehicle power system. When the vehicle is running, the power supply and the low-voltage power supply independently supply power to the high-voltage electrical components and the low-voltage electrical components, respectively.

[0059] Furthermore, during the charging process, the control unit regulates the on / off state of the charging circuit and the switching circuit on the charging circuit based on the voltage of the individual batteries in the power supply and the low-voltage power supply, driving the charging system to charge the power supply alone, or driving the charging system to charge the power supply and the low-voltage power supply together when the individual batteries in the power supply and the low-voltage power supply are at the same voltage, thereby realizing safe and efficient charging of the power supply system in series with the power supply and the low-voltage power supply.

[0060] In summary, the vehicle power system, control method, and vehicle provided by this invention include a power supply and a low-voltage power supply that can independently supply power to high-voltage and low-voltage electrical components. The power system utilizes a series charging circuit and a parallel switching circuit to achieve efficient and safe charging of the power supply and low-voltage power supply. Compared to existing technologies, this eliminates the need for DC / DC converters and related wiring, effectively increasing the capacity and lifespan of the low-voltage power supply in the power system, reducing the overall vehicle weight, and lowering the overall vehicle manufacturing cost.

[0061] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A vehicle power supply system, characterized in that, include: The power source is electrically connected to high-voltage electrical components via a high-voltage circuit. A low-voltage power supply is connected in series with the power supply and electrically connected to the low-voltage electrical components through a low-voltage circuit. A charging system, wherein the charging system, the power supply and the low-voltage power supply are connected in series in the charging circuit, and a first switch is provided between the power supply and the low-voltage power supply; the charging circuit is also provided with a switching circuit, which is electrically connected to the charging system and the power supply, and is connected in parallel with the first switch and the low-voltage power supply. The control unit is used to control the connection and disconnection of the high-voltage circuit, the charging circuit, the first switch, and the switching circuit; so that when the switching circuit is connected to the charging circuit, the charging system charges the power source separately; and when the switching circuit is disconnected and the charging circuit is connected, the charging system charges the power source and the low-voltage power source simultaneously. During the charging process, when the control unit monitors that the voltage of a single power battery in the power source is lower than the voltage of a single lithium battery in the low-voltage power source, the control unit activates the charging circuit and the switching circuit, causing the charging system to connect to the power source through the charging circuit and the switching circuit, and enabling the charging system to charge the power source; when the control unit monitors that the voltage of a single power battery in the power source is equal to the voltage of a single lithium battery in the low-voltage power source, the control unit activates the charging circuit and deactivates the switching circuit, causing the charging system to connect to the power source and the low-voltage power source through the charging circuit, and enabling the charging system to charge the power source and the low-voltage power source until they are fully charged.

2. The vehicle power system according to claim 1, characterized in that, The power source includes multiple power batteries connected in series, and the low-voltage power source includes multiple lithium batteries connected in series; within the vehicle's driving range, the voltage of each individual lithium battery in the low-voltage power source is greater than or equal to the voltage of each individual power battery in the power source.

3. The vehicle power system according to claim 2, characterized in that, During the charging process, when the voltage of the power battery is lower than the voltage of the lithium battery, the control unit controls the charging circuit and the switching circuit to connect, thereby driving the charging system to connect with the power source, and the charging system charges the power source; when the voltage of the power battery is equal to the voltage of the lithium battery, the control unit controls the charging circuit to connect and the switching circuit to disconnect, thereby driving the charging system to connect with the power source and the low-voltage power source, and the charging system charges the power source and the low-voltage power source.

4. The vehicle power system according to claim 1, characterized in that, The charging circuit connected between the charging system and the positive terminal of the power source includes a first circuit and a second circuit connected in parallel. The first circuit is connected in series with a second switch, and the second circuit is connected in series with a third switch and a protective resistor.

5. The vehicle power system according to claim 4, characterized in that, The high-voltage circuit is connected in series with the third switch and the protective resistor on the second circuit.

6. The vehicle power system according to claim 4, characterized in that, When the charging system charges the power source and / or low-voltage power source, the control unit first controls the third switch to be turned on, and then the control unit controls the second switch to be turned on.

7. The vehicle power system according to claim 1, characterized in that, The switching circuit is equipped with a fourth switch, and the charging circuit connecting the charging system to the negative terminal of the low-voltage power supply is equipped with a fifth switch.

8. The vehicle power system according to claim 2, characterized in that, The control unit acquires the voltage of each individual lithium battery in the low-voltage power supply through a signal acquisition circuit. The signal acquisition circuit is connected to the positive and negative terminals of the low-voltage power supply. The signal acquisition circuit connects multiple equalizing resistors in series between the positive and negative terminals of the low-voltage power supply, and connects the multiple equalizing resistors to the corresponding terminals of the lithium battery in sequence through a switching circuit.

9. A vehicle, characterized in that, The vehicle includes the vehicle power system as described in any one of claims 1 to 8.

Images