Power supply system, vehicle and control method

Abstract

The invention provides a power supply system, a vehicle and a control method. The power supply system comprises a first battery, a first DC / DC, a distribution box, a second DC / DC and a second battery, the first DC / DC is electrically connected with the first battery and a load, the first DC / DC is used for supplying power to the load, the first battery, the distribution box, the second DC / DC and the second battery are electrically connected in sequence, the first battery is configured to charge the second battery through the distribution box and the second DC / DC, and the second battery is used for supplying power to the load. According to the power supply system, power can be supplied to the load through the power supply line from the first battery to the first DC / DC, power can also be directly supplied to the load through the second battery, the situation that the second battery supplies power to the load for a long time can be avoided, the conditions of undervoltage and the like caused by long-time discharging can be prevented, and the service life of the second battery is guaranteed.

Description

Technical Field

[0001] This application relates to the technical field of power supply system testing, and specifically relates to a power supply system, a vehicle, and a control method. Background Art

[0002] The low-voltage electrical system of an electric vehicle mainly consists of a high-voltage battery, a DC / DC conversion module, a 12V low-voltage battery (lead-acid battery or lithium-ion battery), and low-voltage electrical loads. The high-voltage battery steps down the high-voltage direct current to 12V through the DC / DC conversion module to charge the 12V low-voltage battery, while the vehicle's low-voltage loads (such as lighting systems, in-vehicle electronic devices, controllers, etc.) are directly powered by the 12V low-voltage battery.

[0003] In related technologies, due to the limited capacity of the 12V low-voltage battery, long-term discharge easily leads to undervoltage of the low-voltage battery, affecting the battery life. Summary of the Invention

[0004] Embodiments of this application provide a power supply system, a vehicle, and a control method, which can improve the technical problem that long-term discharge of the 12V low-voltage battery easily leads to undervoltage of the low-voltage battery.

[0005] In a first aspect, embodiments of this application provide a power supply system, including:

[0006] A first battery;

[0007] A first DC / DC, the first DC / DC being electrically connected to the first battery and the load, for supplying power to the load; and

[0008] A distribution box, a second DC / DC, and a second battery, the first battery, the distribution box, the second DC / DC, and the second battery being electrically connected in sequence, the first battery being configured to charge the second battery through the distribution box and the second DC / DC, and the second battery being used to supply power to the load.

[0009] In one embodiment, the distribution box includes a first switch module, the first switch module being electrically connected to the second DC / DC and the first battery, and the first DC / DC being connected between the first switch module and the first battery.

[0010] In one embodiment, the power supply system further includes a second switch module, the second switch module being connected between the first battery and the first DC / DC, and the second switch module being used to control the on / off between the first DC / DC and the first battery.

[0011] In one embodiment, the second DC / DC is electrically connected to the load.

[0012] In one embodiment, the first DC / DC is electrically connected to the second battery and the first battery so that the first battery can supply power to the second battery.

[0013] In one embodiment, the power of the first DC / DC is less than the power of the second DC / DC.

[0014] In one embodiment, the power supply system further includes a BMS module, the BMS module is electrically connected to the first DC / DC, and the BMS module is configured to: control the working mode of the first DC / DC based on the voltage of the second battery.

[0015] In one embodiment, the power supply system further includes a battery pack housing, and the first DC / DC is disposed in the battery pack housing; and / or,

[0016] The distribution box has an installation space, and the first DC / DC is disposed in the installation space.

[0017] In a second aspect, an embodiment of the present application provides a vehicle, including the above power supply system.

[0018] In a third aspect, an embodiment of the present application provides a power supply system control method, including:

[0019] Controlling the first DC / DC to supply power to at least one of the second battery and the load.

[0020] In one embodiment, the step of controlling the first DC / DC to supply power to at least one of the second battery and the load includes:

[0021] When the first battery is in a powered-off state, controlling the first DC / DC to supply power to the load.

[0022] In one embodiment, the step of controlling the first DC / DC to supply power to at least one of the second battery and the load includes:

[0023] When the first battery is in a powered-off state, controlling the first DC / DC and the second battery to alternately supply power to the load.

[0024] In one embodiment, the step of controlling the first DC / DC and the second battery to alternately supply power to the load includes:

[0025] When the voltage of the second battery is not less than a threshold value, controlling the second battery to supply power to the load;

[0026] When the voltage of the second battery is less than the threshold value, controlling the first DC / DC to supply power to the load.

[0027] In one embodiment, the step of controlling the second battery to supply power to the load includes:

[0028] Controlling the second battery to supply power to the load and controlling the first DC / DC to be in a low power consumption mode.

[0029] In one embodiment, the step of controlling the first DC / DC to supply power to the load includes:

[0030] Controlling the first DC / DC to supply power to the load and controlling the first DC / DC to charge the second battery.

[0031] In one embodiment, after the step of controlling the first DC / DC to supply power to at least one of the second battery and the load, the method further includes:

[0032] When the first battery is in a powered-on state, controlling to disconnect the first DC / DC and the first battery.

[0033] Advantages of the embodiments of the present application:

[0034] In the embodiments of the present application, the power distribution box can distribute the voltage of the first battery to the second DC / DC, and the second DC / DC converts the voltage of the first battery to obtain a voltage matching the second battery, so as to charge the second battery. When supplying power to the load, the second battery can be directly used to supply power to the load, or the first DC / DC can be controlled to work to convert the voltage of the first battery into a voltage matching the load, and then supply power to the load. That is to say, the present application can supply power to the load either through the power supply line from the first battery to the first DC / DC or directly through the second battery, thereby avoiding the second battery from supplying power to the load for a long time, preventing situations such as undervoltage caused by long-term discharge, and ensuring the life of the second battery. Description of the Drawings

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

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

[0037] Figure 2 is one of the schematic structural diagrams of the power supply system provided by the embodiments of the present application;

[0038] Figure 3 It is the second schematic structural diagram of the power supply system provided by the embodiment of the present application;

[0039] Figure 4 It is the flowchart of the power supply system control method provided by the embodiment of the present application. Specific Embodiments

[0040] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present application. In addition, it should be understood that the specific embodiments described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, unless otherwise stated, the orientation words such as "upper" and "lower" generally refer to the upper and lower in the actual use or working state of the device, specifically the drawing direction in the drawings; and "inner" and "outer" refer to the outline of the device.

[0041] Next, in conjunction with Figures 1 to 4 describe the power supply system, vehicle and control method of the present application.

[0042] According to an embodiment of the first aspect of the present application, referring to Figure 2 and Figure 3 , the power supply system includes a first battery 1, a first DC / DC 2, a distribution box 3, a second DC / DC 4 and a second battery 5. The first DC / DC 2 is electrically connected to the first battery 1 and the load 8, and the first DC / DC 2 is used to supply power to the load 8. The first battery 1, the distribution box 3, the second DC / DC 4 and the second battery 5 are electrically connected in sequence. The first battery 1 is configured to charge the second battery 5 through the distribution box 3 and the second DC / DC 4, and the second battery 5 is used to supply power to the load 8.

[0043] For the power supply system according to the embodiment of the present application, the distribution box 3 can distribute the voltage of the first battery 1 to the second DC / DC 4, and the second DC / DC 4 converts the voltage of the first battery 1 to obtain a voltage matching the second battery 5, so as to charge the second battery 5. When supplying power to the load 8, the second battery 5 can be used to directly supply power to the load 8, or the first DC / DC 2 can be controlled to work to convert the voltage of the first battery 1 into a voltage matching the load 8, and then supply power to the load 8. That is to say, the present application can supply power to the load 8 either through the power supply line from the first battery 1 to the first DC / DC 2 or directly through the second battery 5, thereby avoiding the second battery 5 from supplying power to the load 8 for a long time, preventing situations such as undervoltage caused by long-term discharge, and ensuring the service life of the second battery 5.

[0044] In some examples, the voltage of the first battery 1 is greater than the voltage of the second battery 5, that is, the first battery 1 is a high-voltage battery and the second battery 5 is a low-voltage battery. Exemplarily, the second battery 5 is a 12V battery or a 24V battery or a 48V battery.

[0045] In the related art, referring to Figure 1 , after the high-voltage battery (i.e., the first battery 1) is powered off, generally only the low-voltage battery (i.e., the second battery 5) supplies power to the load 8. However, due to the limited capacity of the low-voltage battery, long-term discharge is likely to cause the low-voltage battery to be under-voltage. In this application, by providing a first DC / DC 2 electrically connected to the first battery 1 and the load 8, after the first battery 1 is powered off, the load 8 can still be powered by the first DC / DC 2. Compared with only the second battery 5 supplying power to the load 8, the problem of under-voltage caused by the long-term discharge of the second battery 5 can be effectively avoided.

[0046] In some examples, after the first battery 1 is powered off, the first DC / DC 2 can convert the voltage of the first battery 1 and supply power to the load 8.

[0047] In some examples, before the first battery 1 is powered off, the power supply of the second battery 5 to the load 8 can be disconnected, and the first DC / DC 2 can convert the voltage of the first battery 1 and supply power to the load 8.

[0048] In some embodiments, referring to Figure 2 and Figure 3 , the power distribution box 3 includes a first switch module 31. The first switch module 31 is electrically connected to the second DC / DC 4 and the first battery 1, and the first DC / DC 2 is connected between the first switch module 31 and the first battery 1.

[0049] It can be understood that the on / off of the first battery 1 and the second DC / DC 4 can be controlled through the first switch module 31, that is, the first battery 1 can be switched between the powered-on state and the powered-off state. Connecting the first DC / DC 2 between the first switch module 31 and the first battery 1 can avoid the first switch module 31 affecting the first DC / DC 2. That is to say, even when the first switch module 31 is in the off state, the first DC / DC 2 can still be connected to the first battery 1. Furthermore, when the first battery 1 is in the powered-off state, the first DC / DC 2 can convert the voltage of the first battery 1 and supply power to the load 8, which can avoid the situation where only the second battery 5 supplies power to the load 8 after the first battery 1 is powered off, and effectively prevent the second battery 5 from being under-voltage due to long-term discharge.

[0050] It can be understood that when the vehicle is turned off or in the sentry mode, etc., the first battery 1 will be in the powered-off state.

[0051] In some examples, the first switch module 31 includes a relay, a MOS transistor, or any other suitable switching element.

[0052] In some embodiments, referring to Figure 3 , the power supply system further includes a second switch module 6. The second switch module 6 is connected between the first battery 1 and the first DC / DC 2, and the second switch module 6 is used to control the on / off between the first DC / DC 2 and the first battery 1.

[0053] It can be understood that if the first DC / DC 2 is directly connected to the first battery 1, the first DC / DC 2 will always be in the working mode. That is to say, even if the first DC / DC 2 is not used to supply power to other components, the first DC / DC 2 will cause loss to the first battery 1.

[0054] In this embodiment, the second switch module 6 can control the on / off between the first DC / DC 2 and the first battery 1. When it is necessary to use the first DC / DC 2 to output voltage to supply power to other components, the second switch module 6 is electrically connected to the first DC / DC 2 and the first battery 1. When it is not necessary for the first DC / DC 2 to output voltage to supply power to other components, the second switch module 6 is disconnected to disconnect the first DC / DC 2 and the first battery 1. That is to say, by setting the second switch module 6, it is possible to avoid the first DC / DC 2 being always electrically connected to the first battery 1, reduce the loss caused to the first battery 1, and avoid situations such as undervoltage of the first battery 1.

[0055] In some examples, the second switch module 6 includes a relay, a MOS transistor, or any other suitable switching element.

[0056] In some embodiments, the second DC / DC 4 is electrically connected to the load 8.

[0057] It can be understood that by electrically connecting the second DC / DC 4 and the load 8, the second DC / DC 4 can directly supply power to the load 8 after converting the voltage of the first battery 1, or can charge the second battery 5.

[0058] In some embodiments, the first DC / DC 2 is electrically connected to the second battery 5 and the first battery 1 so that the first battery 1 can supply power to the second battery 5.

[0059] It can be understood that the first DC / DC 2 is connected to the second battery 5, and then the first DC / DC 2 can convert the voltage of the first battery 1 and supply power to the second battery 5 to realize charging the second battery 5 with the first battery 1.

[0060] It is understandable that after the first battery 1 is powered off, the power distribution box 3 disconnects the first battery 1 and the second DC / DC 4, and the second DC / DC 4 no longer supplies power to the second battery 5. However, the first DC / DC 2 can be used to supply power to the second battery 5, ensuring that the second battery 5 has sufficient power and preventing the second battery 5 from experiencing undervoltage.

[0061] In some examples, the first DC / DC converter 2 can power both the second battery 5 and the load 8, and the second battery 5 can also power the load 8. Furthermore, the first DC / DC converter 2 and the second battery 5 can alternately power the load 8. When the voltage of the second battery 5 is not less than a threshold, the first DC / DC converter 2 is controlled to operate in a low-power mode, and the second battery 5 is used to power the load 8. When the voltage of the second battery 5 is less than the threshold, the first DC / DC converter 2 is controlled to operate in a normal mode, and the first DC / DC converter 2 is used to supplement the power of the second battery 5. This enables intermittent operation of the first DC / DC converter 2, which helps reduce the occurrence of random failures and energy consumption.

[0062] In some embodiments, the power of the first DC / DC 2 is less than the power of the second DC / DC 4 .

[0063] It is understandable that when the vehicle is in sentry mode or ignition off mode, only a small part of the load 8 needs to work, so the power demand of the load 8 at this time is relatively low. In order to meet the power demand of all the loads 8, the power of the second DC / DC 4 is generally larger. At this time, if the second DC / DC 4 is still used to power the load 8, it is easy for the DC / DC to have low working efficiency and large losses.

[0064] In this embodiment, the power of the first DC / DC 2 is less than the power of the second DC / DC 4. When the vehicle is in a sentry mode or an ignition-off mode, the first DC / DC 2 can be used to power the load 8. Since the power of the first DC / DC 2 is more closely matched with the power requirement of the load 8 at this time, it is beneficial to improve the working efficiency of the DC / DC and reduce losses.

[0065] It is understandable that in the related art, when only a small portion of the load 8 needs to be operated and the second battery 5 is undervoltage and the second DC / DC 4 needs to be activated to replenish the second battery 5, the load 8 of the second DC / DC 4 is relatively low at this time, resulting in low operating efficiency of the second DC / DC 4, causing significant losses and affecting the endurance of the first battery 1. The present application adds a first DC / DC 2 with lower power than the second DC / DC 4. The first DC / DC 2 can be more adaptable to low load 8 situations to reduce losses.

[0066] In some examples, the power of the first DC / DC is, for example, 200W or 300W.

[0067] In some embodiments, referring to Figure 2 and Figure 3 , the power supply system further includes a BMS module 7. The BMS module 7 is electrically connected to the first DC / DC 2 and is configured to control the working mode of the first DC / DC 2 based on the voltage of the second battery 5.

[0068] It can be understood that by comparing the voltage of the second battery 5 with a threshold value, when the voltage of the second battery 5 is not less than the threshold value, it indicates that the second battery 5 has sufficient power at this time and can supply power to the load 8. Therefore, the second battery 5 is controlled to supply power to the load 8. When the voltage of the second battery 5 is less than the threshold value, it indicates that the second battery 5 has insufficient power, and the first DC / DC 2 is controlled to supply power to the load 8 to avoid situations such as undervoltage when the second battery 5 supplies power to the load 8 for a long time.

[0069] In some examples, when controlling the second battery 5 to supply power to the load 8, the first DC / DC 2 can be controlled to be in a low-power consumption mode to reduce the consumption of the first DC / DC 2 on the first battery 1.

[0070] In some examples, when controlling the first DC / DC 2 to supply power to the load 8, the first DC / DC 2 is controlled to charge the second battery 5 to increase the power of the second battery 5. When the voltage of the second battery 5 is not less than the threshold value, the second battery 5 is controlled to supply power to the load 8 again to achieve the rotation of the second battery 5 and the first DC / DC 2 to supply power to the load 8.

[0071] In some embodiments, the power supply system further includes a battery pack housing, and the first DC / DC 2 is disposed inside the battery pack housing.

[0072] It can be understood that disposing the first DC / DC 2 inside the battery pack housing improves the integration degree of the power supply system.

[0073] In some examples, the first battery 1 and a distribution box 3 are disposed inside the battery pack housing, that is, the battery pack includes the first battery 1 and the distribution box 3.

[0074] In some embodiments, the distribution box 3 has an installation space, and the first DC / DC 2 is disposed inside the installation space.

[0075] It can be understood that disposing the first DC / DC 2 inside the installation space of the distribution box 3 improves the space utilization rate of the distribution box 3.

[0076] According to an embodiment of the second aspect of the present application, a vehicle includes the above-mentioned power supply system.

[0077] For a vehicle according to an embodiment of the present application, the power distribution box 3 can distribute the voltage of the first battery 1 to the second DC / DC 4, and the second DC / DC 4 converts the voltage of the first battery 1 to obtain a voltage matching the second battery 5, so as to charge the second battery 5. When powering the load 8, the second battery 5 can be directly used to power the load 8, or the first DC / DC 2 can be controlled to work to convert the voltage of the first battery 1 into a voltage matching the load 8, and then power the load 8. That is to say, the present application can power the load 8 either through the power supply line from the first battery 1 to the first DC / DC 2 or directly through the second battery 5, thereby avoiding the second battery 5 from powering the load 8 for a long time, preventing situations such as undervoltage caused by long-term discharge, and ensuring the life of the second battery 5.

[0078] In some examples, the vehicle can be a fuel vehicle, a plug-in hybrid vehicle, a new energy vehicle, etc., and the present application does not make specific limitations on this.

[0079] According to an embodiment of the third aspect of the present application, refer to Figure 4 , a power supply system control method, including:

[0080] Step 101, control the first DC / DC 2 to supply power to at least one of the second battery 5 and the load 8.

[0081] According to the power supply system control method of the present application, by controlling the first DC / DC 2 to supply power to the second battery 5, the power of the second battery 5 can be increased, the second battery 5 can be replenished, and situations such as undervoltage of the second battery 5 can be avoided. By controlling the first DC / DC 2 to supply power to the load 8, the second battery 5 can stop supplying power to the load 8, avoiding the situation of undervoltage caused by the second battery 5 supplying power for a long time.

[0082] Exemplarily, the real-time state of the first battery 1 is obtained. When the first battery 1 is in the powered-on state, it indicates that at this time, a circuit is formed among the first battery 1, the power distribution box 3, the second DC / DC 4, and the second battery 5. The second DC / DC 4 can convert the output voltage of the first battery 1 and then charge the second battery 5. Therefore, at this time, the first DC / DC 2 can be controlled to be in a low-power state or not working. When the first battery 1 is in the powered-off state, it indicates that the connection between the second DC / DC 4 and the first battery 1 is disconnected at this time. The second DC / DC 4 cannot obtain the voltage of the first battery 1 and thus cannot charge the second battery 5. At this time, the first DC / DC 2 can be controlled to be in the normal working state, so that the first DC / DC 2 can supply power to the load 8. That is to say, the present application can control the operation of the first DC / DC 2 according to the state of the first battery 1, so that the first DC / DC 2 can convert the voltage of the first battery 1 and supply power to the load 8 when the first battery 1 is in the powered-off state, which can avoid the second battery 5 supplying power to the load 8 for a long time, prevent situations such as undervoltage caused by long-term discharge, and ensure the service life of the second battery 5.

[0083] In some embodiments, the step of controlling the first DC / DC 2 to supply power to at least one of the second battery 5 and the load 8 includes:

[0084] When the first battery 1 is in the powered-off state, control the first DC / DC 2 to supply power to the load 8.

[0085] It can be understood that when it is determined that the first battery 1 is in the powered-off state, it indicates that the connection between the second DC / DC 4 and the first battery 1 is disconnected at this time. The second DC / DC 4 cannot obtain the voltage of the first battery 1 and thus cannot charge the second battery 5. Furthermore, the first DC / DC 2 can be controlled to supply power to the load 8, so that the second battery 5 no longer supplies power to the load 8 or reduces the power supply frequency / quantity of the second battery 5, in order to avoid the second battery 5 supplying power to the load 8 for a long time, prevent situations such as undervoltage caused by long-term discharge, and ensure the service life of the second battery 5.

[0086] In some embodiments, the step of controlling the first DC / DC 2 to supply power to at least one of the second battery 5 and the load 8 includes:

[0087] When the first battery 1 is in the powered-off state, control the first DC / DC 2 and the second battery 5 to supply power to the load 8 alternately.

[0088] It can be understood that when it is determined that the first battery 1 is in the power-down state, it means that the connection between the second DC / DC 4 and the first battery 1 is disconnected at this time. The second DC / DC 4 cannot obtain the voltage of the first battery 1 and thus cannot charge the second battery 5. At this time, the first DC / DC 2 and the second battery 5 are used to supply power to the load 8 alternately. When the voltage of the second battery 5 is not less than the threshold, the first DC / DC 2 is controlled to be in the low-power mode, and the second battery 5 is used to supply power to the load 8. When the voltage of the second battery 5 is less than the threshold, the first DC / DC 2 is controlled to be in the normal working mode, and the first DC / DC 2 is used to supply power to the load 8. Thus, the intermittent operation of the first DC / DC 2 is realized, which is beneficial to reducing the occurrence of random failure rate and reducing energy consumption.

[0089] In some examples, the first DC / DC 2 is connected to the second battery 5, and thus the first DC / DC 2 can be used to replenish the power of the second battery 5 to ensure that the second battery 5 has sufficient power and avoid the situation of undervoltage of the second battery 5.

[0090] In some embodiments, the step of controlling the first DC / DC 2 and the second battery 5 to supply power to the load 8 alternately includes:

[0091] When the voltage of the second battery 5 is not less than the threshold, control the second battery 5 to supply power to the load 8;

[0092] When the voltage of the second battery 5 is less than the threshold, control the first DC / DC 2 to supply power to the load 8.

[0093] It can be understood that when controlling the first DC / DC 2 and the second battery 5 to supply power to the load 8 alternately, the voltage of the second battery 5 is compared with the threshold. When the voltage of the second battery 5 is not less than the threshold, it means that the second battery 5 has sufficient power at this time and can supply power to the load 8. Therefore, the second battery 5 is controlled to supply power to the load 8. When the voltage of the second battery 5 is less than the threshold, it means that the second battery 5 has insufficient power at this time, and the first DC / DC 2 is controlled to supply power to the load 8 to avoid situations such as undervoltage when the second battery 5 supplies power to the load 8 for a long time.

[0094] Specifically, the step of controlling the second battery 5 to supply power to the load 8 includes:

[0095] Control the second battery 5 to supply power to the load 8 and control the first DC / DC 2 to be in the low-power mode.

[0096] It can be understood that when controlling the second battery 5 to supply power to the load 8, the first DC / DC 2 is controlled to be in the low-power mode to reduce the consumption of the first DC / DC 2 on the first battery 1.

[0097] Specifically, the step of controlling the first DC / DC 2 to supply power to the load 8 includes:

[0098] Control the first DC / DC2 to supply power to the load 8 and control the first DC / DC2 to charge the second battery 5.

[0099] It can be understood that when controlling the first DC / DC2 to supply power to the load 8, the first DC / DC2 is controlled to charge the second battery 5 to increase the power of the second battery 5. When the voltage of the second battery 5 is not less than the threshold, the second battery 5 is controlled again to supply power to the load 8, so as to realize that the second battery 5 and the first DC / DC2 supply power to the load 8 in turn.

[0100] In some embodiments, after the step of controlling the first DC / DC2 to supply power to at least one of the second battery 5 and the load 8, it further includes:

[0101] When the first battery 1 is in the powered-on state, control to disconnect the first DC / DC2 and the first battery 1.

[0102] It can be understood that when the first battery 1 is in the powered-on state, it means that at this time, the second DC / DC can be directly used to supply power to the second battery 5 and / or the load 8. Furthermore, the first DC / DC2 and the first battery 1 can be controlled to be disconnected to avoid the consumption of the first battery 1 by the first DC / DC2 and is beneficial to reducing the random failure rate of the first DC / DC2.

[0103] The embodiments of the present application have been introduced in detail above. Specific examples are used in this article to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application; at the same time, for those skilled in the art, according to the idea of the present application, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present application.

Claims

1. A power supply system, characterized in that, Comprising: A first battery; A first DC / DC, the first DC / DC being electrically connected to the first battery and the load for powering the load; And A power distribution box, a second DC / DC, and a second battery, the first battery, the power distribution box, the second DC / DC, and the second battery being electrically connected in sequence, the first battery being configured to charge the second battery through the power distribution box and the second DC / DC, and the second battery being used to power the load.

2. The power supply system according to claim 1, wherein The power distribution box includes a first switch module, the first switch module being electrically connected to the second DC / DC and the first battery, and the first DC / DC being connected between the first switch module and the first battery.

3. The power supply system according to claim 1, wherein The power supply system further includes a second switch module, the second switch module being connected between the first battery and the first DC / DC, and the second switch module being used to control the on / off between the first DC / DC and the first battery.

4. The power supply system according to any one of claims 1 to 3, characterized in that The second DC / DC is electrically connected to the load.

5. The power supply system according to any one of claims 1 to 3, characterized in that The first DC / DC is electrically connected to the second battery and the first battery so that the first battery can power the second battery.

6. The power supply system according to any one of claims 1 to 3, characterized in that, The power of the first DC / DC is less than the power of the second DC / DC.

7. The power supply system according to any one of claims 1 to 3, characterized in that, The power supply system further includes a BMS module, the BMS module being electrically connected to the first DC / DC, and the BMS module being configured to: control the working mode of the first DC / DC based on the voltage of the second battery.

8. The power supply system according to any one of claims 1 to 3, characterized in that, The power supply system further includes a battery pack housing, and the first DC / DC is disposed within the battery pack housing; and / or, The power distribution box has an installation space, and the first DC / DC is disposed within the installation space.

9. A vehicle, characterized in that, Comprising the power supply system according to any one of claims 1 to 8.

10. A power supply system control method based on the power supply system according to any one of claims 1 to 8, characterized in that, Comprising: Controlling the first DC / DC to power at least one of the second battery and the load.

11. The power supply system control method according to claim 10, wherein The step of controlling the first DC / DC to power at least one of the second battery and the load includes: When the first battery is in a power-off state, controlling the first DC / DC to power the load.

12. The power supply system control method according to claim 10, characterized in that, The step of controlling the first DC / DC to power at least one of the second battery and the load includes: When the first battery is in a power-off state, controlling the first DC / DC and the second battery to alternately power the load.

13. The power supply system control method according to claim 12, characterized in that, The step of controlling the first DC / DC and the second battery to alternately power the load includes: When the voltage of the second battery is not less than a threshold value, controlling the second battery to power the load; When the voltage of the second battery is less than the threshold value, controlling the first DC / DC to power the load.

14. The power supply system control method according to claim 13, wherein The step of controlling the second battery to power the load includes: Controlling the second battery to power the load and controlling the first DC / DC to be in a low power consumption mode.

15. The power supply system control method according to claim 13, characterized in that, The step of controlling the first DC / DC to power the load includes: Controlling the first DC / DC to power the load and controlling the first DC / DC to charge the second battery.

16. The power supply system control method according to any one of claims 10 to 15, characterized in that, After the step of controlling the first DC / DC to supply power to at least one of the second battery and the load, the method further includes: When the first battery is in the powered-on state, controlling to disconnect the first DC / DC and the first battery.

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