Power supply method, power supply circuit, battery system, power utilization device and energy storage device

Abstract

The invention provides a power supply method, a power supply circuit, a battery system, a power utilization device and an energy storage device, and belongs to the technical field of batteries. The power supply method comprises the following steps: acquiring a first voltage of a first battery which supplies power to a load at present and a second voltage of a second battery to be switched; according to the fact that the difference value between the first voltage and the second voltage is larger than 0V, when the first battery is switched to the second battery to supply power to the load, an adjustable power supply is adopted to supply power to the load; wherein in response to the fact that the difference value between the voltage of the adjustable power supply and the first voltage is adjusted to be smaller than a first threshold value, switching from the first battery to the adjustable power supply to supply power to the load is executed, and in response to the fact that the difference value between the voltage of the adjustable power supply and the second voltage is adjusted to be smaller than a second threshold value, switching from the first battery to the load is executed. And switching from the adjustable power supply to the second battery to supply power to the load is executed. According to the power supply method provided by the embodiment of the invention, the problem that circulating current is possibly generated when the first battery and the second battery are switched can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and particularly to a power supply method, a power supply circuit, a battery system, an electrical device, and an energy storage device. Background Art

[0002] Energy conservation and emission reduction are the keys to the sustainable development of society. Rechargeable batteries have the characteristics of storing energy or releasing energy according to needs, and thus are widely used in various electrical devices or energy storage systems, and are an important part of promoting energy transformation and sustainable development. For the new energy industry, battery technology is also an important factor related to its development.

[0003] In the related art, in order to improve the power supply reliability to an electrical device, multiple batteries are usually used for power supply. The multiple batteries can supply power to the battery in parallel or in series, or the multiple batteries can also supply power to the battery separately. In the case where the multiple batteries supply power to the battery separately, the battery needs to be switched. If the voltages of the two switched batteries are inconsistent, a circulating current is likely to be generated. Summary of the Invention

[0004] The present application aims to at least solve one of the technical problems existing in the background art. To this end, an object of the present application is to provide a power supply method, a power supply circuit, a battery system, an electrical device, and an energy storage device to improve the problem of generating a circulating current during battery switching.

[0005] An embodiment of the first aspect of the present application provides a power supply method, including: obtaining a first voltage of a first battery currently supplying power to a load and a second voltage of a second battery to be switched; according to the difference between the first voltage and the second voltage being greater than 0V, during the switching from the first battery to the second battery for supplying power to the load, using an adjustable power supply to supply power to the load; wherein, in response to the voltage of the adjustable power supply being adjusted to a difference less than a first threshold from the first voltage, performing the switching from the first battery to the adjustable power supply for supplying power to the load, and in response to the voltage during the adjustable power supply supplying power to the load being adjusted to a difference less than a second threshold from the second voltage, performing the switching from the adjustable power supply to the second battery for supplying power to the load.

[0006] In the technical solution of the embodiment of the present application, when the difference between the first voltage and the second voltage is greater than 0V, the first battery does not directly switch to the second battery. Instead, the first battery is first switched to the adjustable power supply, and then the adjustable power supply is switched to the second battery, thereby completing the switching from the first battery to the second battery. The voltage of the adjustable power supply can be adjusted. When the voltage of the first battery is close to or the same as the voltage of the adjustable power supply, the first battery is switched to the adjustable power supply. In this way, even if the first battery and the adjustable power supply are briefly connected to the load together when the first battery is switched to the adjustable power supply, the problem of circulating current occurring between the adjustable power supply and the first battery can be greatly improved. Similarly, when the voltage of the adjustable power supply is close to or the same as the voltage of the second battery, the adjustable power supply is switched to the second battery. Even if the adjustable power supply and the second battery are briefly connected to the load together when the adjustable power supply is switched to the second battery, the problem of circulating current occurring between the adjustable power supply and the second battery can be greatly improved. Thus, the problem of relatively serious circulating current generated when the first battery is directly switched to the second battery due to the different voltages of the first battery and the second battery can be improved.

[0007] In some embodiments, in response to the voltage of the adjustable power supply being adjusted to a difference from the first voltage less than the first threshold, performing the switching from the first battery to the adjustable power supply supplying power to the load includes: in response to the voltage of the adjustable power supply being adjusted to a difference from the first voltage less than the first threshold, controlling the adjustable power supply to supply power to the load; during the period when the adjustable power supply supplies power to the load, cutting off the power supply of the first battery to the load. Cutting off the power supply of the first battery to the load only after the adjustable power supply starts to supply power to the load can avoid interruption of the power supply to the load. When the battery is used in a vehicle, power interruption can be avoided, so that battery switching can be performed during vehicle driving and the normal driving of the vehicle will not be affected.

[0008] In some embodiments, in response to the voltage during the period when the adjustable power supply supplies power to the load being adjusted to a difference from the second voltage less than the second threshold, performing the switching from the adjustable power supply to the second battery supplying power to the load includes: in response to the voltage during the period when the adjustable power supply supplies power to the load being adjusted to a difference from the second voltage less than the second threshold, controlling the second battery to supply power to the load; during the period when the second battery supplies power to the load, cutting off the power supply of the adjustable power supply to the load. Thus, interruption of the power supply to the load can be avoided. When the battery is used in a vehicle, power interruption can be avoided, so that battery switching can be performed during vehicle driving and the normal driving of the vehicle will not be affected.

[0009] In some embodiments, the method further includes: according to the first voltage being equal to the second voltage, during the switching from the first battery to the second battery for supplying power to the load, controlling the adjustable power supply to supply power to the load based on a third voltage, the difference between the third voltage and the first voltage being less than a first threshold; wherein, during the adjustable power supply supplying power to the load, cutting off the power supply of the first battery to the load, and controlling the second battery to supply power to the load. Thereby, the problem of power supply interruption during the switching from the first battery to the second battery can be avoided.

[0010] In some embodiments, the method further includes: according to the first voltage being equal to the second voltage, performing a direct switch from the first battery to the second battery for supplying power to the load, wherein, before cutting off the power supply of the first battery to the load, controlling the second battery to supply power to the load. Thereby, there is a period when the first battery and the second battery supply power to the load simultaneously, the power supply interruption to the load can be avoided, and since the first voltage and the second voltage are equal, even if the first battery and the second battery supply power to the load simultaneously, no circulating current will be generated between the first battery and the second battery.

[0011] In some embodiments, the positive electrode of the first battery and the positive electrode of the second battery are connected to a first node, the negative electrode of the first battery and the negative electrode of the second battery are connected to a second node, the first node and the second node are respectively connected to the positive electrode and the negative electrode of the load; the first battery and the second battery are further connected to a switch module, and the switch module is connected to the first node and / or the second node; the method includes: through the switch module, controlling the disconnection between the first battery and the first node and / or the second node to cut off the power supply of the first battery to the load; through the switch module, controlling the connection between the first battery and the first node and the second node to perform the power supply of the first battery to the load; through the switch module, controlling the disconnection between the second battery and the first node and / or the second node to cut off the power supply of the second battery to the load; through the switch module, controlling the connection between the second battery and the first node and the second node to perform the power supply of the second battery to the load. The positive electrode of the first battery and the positive electrode of the second battery are both connected to the first node, the negative electrode of the first battery and the negative electrode of the second battery are both connected to the second node, and the switch module can control the connection and disconnection between the first battery and the first node and / or the second node, and control the connection and disconnection between the second battery and the first node and / or the second node. In this way, through the switch module, the first battery and the second battery can supply power to the load separately or in parallel, thereby being able to meet different power supply requirements of the load and improving the reliability of power supply to the load.

[0012] In some embodiments, the method further includes: under a first operating condition, through a switching module, supplying power to a load by the first battery or the second battery; under a second operating condition, through the switching module, controlling the connection between the first battery and the first and second nodes, and the connection between the second battery and the first and second nodes, to supply power to the load jointly by the first battery and the second battery. Through the switching module, different power supply modes for the load are realized under different operating conditions, meeting different power supply requirements of the load and improving the reliability of power supply to the load.

[0013] In some embodiments, the adjustable power supply includes a bidirectional DC-DC converter and a power supply module. The first end of the bidirectional DC-DC converter is connected to the power supply module to adjust the voltage output by the power supply module, and the second end of the bidirectional DC-DC converter is connected to the load. In response to the voltage of the adjustable power supply being adjusted to a difference less than a first threshold from the first voltage, performing the switching from the first battery to the adjustable power supply to supply power to the load, including: in response to the bidirectional DC-DC converter adjusting the voltage output by the power supply module to a difference less than the first threshold from the first voltage, controlling the power supply module to supply power to the load via the DC-DC converter; in response to the voltage during the adjustable power supply supplying power to the load being adjusted to a difference less than a second threshold from the second voltage, performing the switching from the adjustable power supply to the second battery to supply power to the load, including: in response to the bidirectional DC-DC converter adjusting the voltage output by the power supply module to a difference less than the second threshold from the second voltage, controlling the bidirectional DC-DC converter to charge the power supply module. By forming an adjustable power supply with the bidirectional DC-DC converter and the power supply module, during the switching from the first battery to the second battery, the bidirectional DC-DC converter can adjust the voltage output by the power supply module and then input it to the load to supply power to the load, thereby being able to improve the circulating current problem caused by direct switching when the voltage difference between the first battery and the second battery is too large. Moreover, when the adjustable power supply is not required to supply power to the load, it is only necessary to control the bidirectional DC-DC converter to charge the power supply module, with a simple structure and a relatively simple control method.

[0014] An embodiment of the second aspect of the present application provides a power supply circuit, which includes: a plurality of batteries; an adjustable power supply; a control module configured to: obtain a first voltage of a first battery currently supplying power to a load and a second voltage of a second battery to be switched among the plurality of batteries; according to the difference between the first voltage and the second voltage being greater than 0V, during the switching from the first battery to the second battery for supplying power to the load, use the adjustable power supply to supply power to the load; wherein, the control module, in response to the voltage of the adjustable power supply being adjusted to a difference less than a first threshold from the first voltage, performs the switching from the first battery to the adjustable power supply for supplying power to the load, and, in response to the voltage during the adjustable power supply supplying power to the load being adjusted to a difference less than a second threshold from the second voltage, performs the switching from the adjustable power supply to the second battery for supplying power to the load. When the voltage of the first battery is close to or the same as the voltage of the adjustable power supply, the first battery is switched to the adjustable power supply. Thus, even if the first battery and the adjustable power supply are briefly connected to the load together when the first battery is switched to the adjustable power supply, the problem of circulating current occurring between the adjustable power supply and the first battery can be greatly improved. Similarly, when the voltage of the adjustable power supply is close to or the same as the voltage of the second battery, the adjustable power supply is switched to the second battery. Even if the adjustable power supply and the second battery are briefly connected to the load together when the adjustable power supply is switched to the second battery, the problem of circulating current occurring between the adjustable power supply and the second battery can be greatly improved. Thereby, the problem of relatively serious circulating current generated when the first battery is directly switched to the second battery due to the different voltages of the first battery and the second battery can be improved.

[0015] In some embodiments, the control module is further configured to: in response to the voltage of the adjustable power supply being adjusted to a difference less than a first threshold from the first voltage, control the adjustable power supply to supply power to the load, and during the adjustable power supply supplying power to the load, cut off the power supply of the first battery to the load to perform the switching from the first battery to the adjustable power supply for supplying power to the load. The control module cuts off the power supply of the first battery to the load only after the adjustable power supply starts to supply power to the load, which can avoid the interruption of power supply to the load. In the case where the battery is used in a vehicle, it can avoid power interruption, so that the battery can be switched during the vehicle's driving process and the normal driving of the vehicle will not be affected.

[0016] In some embodiments, the control module is further configured to: in response to the voltage during the adjustable power supply supplying power to the load being adjusted to a difference less than a second threshold from the second voltage, control the second battery to supply power to the load, and during the second battery supplying power to the load, cut off the power supply of the adjustable power supply to the load to perform the switching from the adjustable power supply to the second battery for supplying power to the load. The control module cuts off the power supply of the adjustable power supply to the load during the second battery supplying power to the load, which can avoid the interruption of power supply to the load. In the case where the battery is used in a vehicle, it can avoid power interruption, so that the battery can be switched during the vehicle's driving process and the normal driving of the vehicle will not be affected.

[0017] In some embodiments, the control module is further configured to: based on the first voltage being equal to the second voltage, during the period of switching from the first battery to the second battery for supplying power to the load, control the adjustable power supply to supply power to the load based on a third voltage, the difference between the third voltage and the first voltage being less than a first threshold; wherein, the control module is configured to cut off the power supply of the first battery to the load during the period when the adjustable power supply supplies power to the load, and control the second battery to supply power to the load. Thereby, the problem of power supply interruption during the switching from the first battery to the second battery can be avoided.

[0018] In some embodiments, the control module is further configured to: based on the first voltage being equal to the second voltage, perform a direct switch from the first battery to the second battery for supplying power to the load, wherein, the control module is configured to control the second battery to supply power to the load before cutting off the power supply of the first battery to the load. Thereby, there is a period when the first battery and the second battery supply power to the load simultaneously, and the power supply interruption to the load can be avoided. And since the first voltage and the second voltage are equal, even if the first battery and the second battery supply power to the load simultaneously, no circulating current will be generated between the first battery and the second battery.

[0019] In some embodiments, among multiple batteries, the positive electrode of each battery is connected to a first node, and the negative electrode of each battery is connected to a second node. The first node and the second node are respectively used for connecting to the positive electrode and the negative electrode of the load; the power supply circuit further includes: a switch module, connected to the batteries, and the switch module is further connected to the first node and / or the second node. The control module is configured to: control the connection and disconnection between the batteries and the first node and / or the second node through the switch module. In this way, through the switch module, the first battery and the second battery can supply power to the load respectively, or supply power to the load in parallel, thereby being able to meet different power supply requirements of the load and improving the reliability of power supply to the load.

[0020] In some embodiments, the switch module includes: multiple switch units, the multiple switch units are respectively connected to the multiple batteries in one-to-one correspondence. Among them, the switch unit is connected to the positive electrode of the battery and the first node, or connected to the negative electrode of the battery and the second node. By setting the switch unit to be connected to the positive electrode of the battery and the first node, or connected to the negative electrode of the battery and the second node, the connection and disconnection between the battery and the first node and the second node are realized, with a simple structure and easy control, thereby being able to improve the reliability of switching from the first battery to the second battery for supplying power to the load.

[0021] In some embodiments, the control module is further configured to: in a first operating condition, through the switching module, perform a switch from the first battery to the second battery to supply power to the load; in a second operating condition, through the switching module, control at least two of the multiple batteries to be connected between the first node and the second node to perform power supply to the load by at least two batteries together. Through the switching module, different power supply modes for the load are realized under different operating conditions, meeting different power supply requirements of the load and improving the reliability of power supply to the load.

[0022] In some embodiments, the adjustable power supply includes a bidirectional DC-DC converter and a power supply module. The first end of the bidirectional DC-DC converter is connected to the power supply module to adjust the voltage output by the power supply module. The second end of the bidirectional DC-DC converter is connected to the load. The control module is configured to: in response to the bidirectional DC-DC converter adjusting the voltage output by the power supply module to a difference less than a first threshold from the first voltage, control the power supply module to supply power to the load via the DC-DC converter; and, in response to the bidirectional DC-DC converter adjusting the voltage output by the power supply module to a difference less than a second threshold from the second voltage, control the bidirectional DC-DC converter to charge the power supply module. By forming an adjustable power supply with the bidirectional DC-DC converter and the power supply module, during the switch from the first battery to the second battery, the bidirectional DC-DC converter can adjust the voltage output by the power supply module and then input it to the load to supply power to the load, thereby being able to improve the circulating current problem caused by a direct switch when the voltage difference between the first battery and the second battery is too large. And, when there is no need for the adjustable power supply to supply power to the load, it is only necessary to control the bidirectional DC-DC converter to charge the power supply module, with a simple structure and a relatively simple control method.

[0023] An embodiment of the third aspect of the present application provides a battery system, including the power supply circuit in the above embodiment.

[0024] An embodiment of the fourth aspect of the present application provides an electrical device, including the battery system in the above embodiment, and the battery system supplies power to the electrical device.

[0025] An embodiment of the fifth aspect of the present application provides an energy storage device, and the energy storage device includes the battery system in the above embodiment, and the battery system is used for storing electrical energy.

[0026] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the specific embodiments of the present application are specifically listed below. Description of the Drawings

[0027] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the several views denote the same or similar components or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings depict only some embodiments disclosed in accordance with the present application and should not be considered as limiting the scope of the present application.

[0028] Figure 1 Schematic structural diagram of a vehicle according to some embodiments of the present application; Figure 2 One of the flowcharts of the power supply method according to some embodiments of the present application; Figure 3 Another flowchart of the power supply method according to some embodiments of the present application; Figure 4 Another flowchart of the power supply method according to some embodiments of the present application; Figure 5 Another flowchart of the power supply method according to some embodiments of the present application; Figure 6 Functional block diagram of a power supply circuit according to some embodiments of the present application; Figure 7 Schematic structural diagram of a power supply circuit according to some embodiments of the present application; Figure 8 Another schematic structural diagram of a power supply circuit according to some embodiments of the present application; Figure 9 Another schematic structural diagram of a power supply circuit according to some embodiments of the present application; Figure 10 Another schematic structural diagram of a power supply circuit according to some embodiments of the present application.

[0029] Explanation of reference numerals: Vehicle 1000, motor controller 1011, vehicle motor 1012, bidirectional DC-DC converter 1021, power supply module 1022, first switch unit 1031, second switch unit 1032; Battery 100, first battery 100a, second battery 100b, load 101, adjustable power supply 102, switch module 103, external charging device 104, control module 105; Vehicle controller 200; Motor 300; Capacitor C1, main relay K1, pre-charge relay K2, charging positive relay K21, charging negative relay K22, first node P1, second node P2. Detailed implementation manners

[0030] The embodiments of the technical solution of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, so they are only examples and cannot be used to limit the protection scope of the present application.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

[0032] In the description of the embodiments of this application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "a plurality" is two or more than two, unless otherwise specifically defined.

[0033] Referring to "embodiments" herein means that the specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The phrase does not necessarily refer to the same embodiment at various positions in the specification, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0034] In the description of the embodiments of this application, the term "and / or" is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0035] In the description of the embodiments of this application, the term "a plurality" refers to two or more (including two).

[0036] In the description of the embodiments of this application, unless otherwise clearly specified and limited, the technical term "connection" is an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to specific circumstances.

[0037] At present, from the perspective of the development of the market situation, rechargeable batteries are more and more widely used. Rechargeable batteries are not only applied to energy storage power systems such as hydraulic, thermal, wind and solar power stations, but also widely used in various electronic devices, such as electric bicycles, electric motorcycles, electric vehicles and other electric transportation tools, as well as military equipment and aerospace and other fields. With the continuous expansion of the application fields of rechargeable batteries, the market demand is also constantly increasing.

[0038] In order to improve the power supply reliability of the electrical device, multiple batteries are usually used for power supply. Multiple batteries can be connected in parallel or in series to supply power to the battery, or multiple batteries can also supply power to the battery separately.

[0039] In the case where multiple batteries supply power to the load separately, it is necessary to switch between the battery currently supplying power to the load and the battery to be switched. When the battery currently supplying power to the load is switched to the battery to be switched, the battery currently supplying power to the load and the battery to be switched may be connected to the load at the same time. If the voltage of the battery currently supplying power to the load is inconsistent with the voltage of the battery to be switched, it is easy to generate a circulating current between the battery currently supplying power to the load and the battery to be switched, and thus potential safety hazards may be generated.

[0040] Based on the above considerations, a power supply method is designed. The method includes: obtaining a first voltage of a first battery currently supplying power to a load and a second voltage of a second battery to be switched; according to the difference between the first voltage and the second voltage being greater than 0V, during the period of switching from the first battery to the second battery supplying power to the load, using an adjustable power supply to supply power to the load; wherein, in response to the voltage of the adjustable power supply being adjusted to a difference less than a first threshold from the first voltage, performing a switch from the first battery to the adjustable power supply supplying power to the load, and in response to the voltage during the period of the adjustable power supply supplying power to the load being adjusted to a difference less than a second threshold from the second voltage, performing a switch from the adjustable power supply to the second battery supplying power to the load.

[0041] That is, when the voltage of the first battery is close to or the same as the voltage of the adjustable power supply, the first battery is switched to the adjustable power supply. In this way, even if the first battery and the adjustable power supply are briefly connected to the load together when the first battery is switched to the adjustable power supply, the problem of circulating current occurring between the adjustable power supply and the first battery can be greatly improved. When the voltage of the adjustable power supply is close to or the same as the voltage of the second battery, the adjustable power supply is switched to the second battery. Even if the adjustable power supply and the second battery are briefly connected to the load together when the adjustable power supply is switched to the second battery, the problem of circulating current occurring between the adjustable power supply and the second battery can be greatly improved. Thus, the problem of relatively serious circulating current generated when the first battery is directly switched to the second battery due to the different voltages of the first battery and the second battery can be improved.

[0042] The battery system disclosed in the embodiments of the present application can be used, but is not limited to, power-consuming devices or energy storage devices such as vehicles, ships, or aircraft. A power supply system for the power-consuming device or energy storage device can be formed using a battery and other components disclosed in the present application.

[0043] The embodiments of the present application provide a power-consuming device using a battery system as a power source. The power-consuming device can be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, an electric vehicle, an electric car, a ship, a spacecraft, and so on. Among them, the electric toy can include stationary or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys, and electric aircraft toys, etc. The spacecraft can include airplanes, rockets, space shuttles, and spaceships, etc.

[0044] The embodiments of the present application also provide an energy storage device using a battery system as a power source. The energy storage device can be, but is not limited to, an energy storage container, an energy storage cabinet, an energy storage power station, an energy storage battery pack, or a portable energy storage system, etc.

[0045] For the convenience of description in the following embodiments, a power-consuming device of an embodiment of the present application, taking a vehicle 1000 as an example, will be described.

[0046] Please refer to Figure 1 , Figure 1 , which is a schematic structural diagram of a vehicle provided by some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc. A battery 100 is disposed inside the vehicle 1000. The battery 100 can be disposed at the bottom, head, or tail of the vehicle 1000. The battery 100 can be used for power supply of the vehicle 1000. For example, the battery 100 can be used as an operating power source of the vehicle 1000. The vehicle 1000 can also include a vehicle controller 200 and a motor 300. The vehicle controller 200 is used to control the battery 100 to supply power to the motor 300. For example, it is used for the working power requirements during the start, navigation, and driving of the vehicle 1000.

[0047] In some embodiments of the present application, the battery 100 can not only be used as an operating power source of the vehicle 1000, but also as a driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0048] The embodiments of the present application provide a power supply method. With reference to Figure 1 , the method includes: Step 110, obtaining a first voltage of a first battery currently supplying power to a load and a second voltage of a second battery to be switched. Step 120: When the difference between the first voltage and the second voltage is greater than 0V, during the process of switching from the first battery to the second battery to supply power to the load, an adjustable power supply is used to supply power to the load. Among them, in response to the voltage of the adjustable power supply being adjusted to a difference less than the first threshold from the first voltage, the power supply is switched from the first battery to the adjustable power supply to supply power to the load; in response to the voltage during the adjustable power supply supplying power to the load being adjusted to a difference less than the second threshold from the second voltage, the power supply is switched from the adjustable power supply to the second battery to supply power to the load.

[0049] In other words, when the difference between the first voltage and the second voltage is greater than 0V, the first battery does not directly switch to the second battery. Instead, the first battery is first switched to the adjustable power supply, and then the adjustable power supply is switched to the second battery, thereby completing the switch from the first battery to the second battery.

[0050] In step 110, the first voltage is the current voltage when the first battery is connected to the load. The second battery is the voltage when it is not connected to the load. A voltage sensor can be used to detect the first voltage of the first battery and the second voltage of the second battery to be switched.

[0051] Steps 110 and 120 can be executed when the first battery is overheated, fails (such as an insulation failure), or the SOC (State of Charge) of the first battery is lower than 2%; alternatively, steps 110 and 120 can also be executed based on a change in the optimal drive voltage feedback from the load, so that the power supply for supplying power to the load is switched from the first battery to the second battery, thereby realizing a change in the voltage for supplying power to the load.

[0052] In some embodiments, step 120 may further include detecting the state of the second battery. If the state of the second battery is normal, the power supply is switched from the first battery to the second battery to supply power to the load; otherwise, the first battery continues to supply power to the load.

[0053] In some embodiments, the battery is used to supply power to a vehicle. The BMS (Battery Management System) of the battery can diagnose whether the first battery has overheated, malfunctioned, or its SOC is lower than 2%. The BMS can also diagnose whether the state of the second battery is normal. For example, it can detect whether the second battery has overheated, malfunctioned, or its SOC is lower than 2%, etc. The BMS can also be communicatively connected to a voltage sensor to receive the voltages of the first battery and the second battery. The vehicle controller can be connected to the BMS, and the BMS can send data of the first battery and the second battery to the vehicle controller, including the voltages, temperatures, SOCs, and fault states of the first battery and the second battery. Based on the data indicating that the first battery has overheated, malfunctioned, or its SOC is lower than 2% received by the vehicle controller, steps 110 and 120 are executed; alternatively, the vehicle controller can also monitor the operating state of the vehicle, and according to the change in the optimal drive voltage of the monitored load, execute steps 110 and 120.

[0054] An adjustable power supply refers to a power supply with an adjustable output voltage. In step 120, before switching from the first battery to the adjustable power supply to supply power to the load, the voltage of the adjustable power supply can be detected. If the difference between the voltage of the adjustable power supply and the first voltage is less than the first threshold, the first battery can be directly switched to the adjustable power supply. If the difference between the voltage of the adjustable power supply and the first voltage is greater than or equal to the first threshold, the voltage of the adjustable power supply is adjusted until the difference between the voltage of the adjustable power supply and the first voltage is less than the first threshold, and then the adjustable power supply is controlled to supply power to the load. Exemplarily, if the voltage of the adjustable power supply is greater than the first voltage, the voltage of the adjustable power supply is adjusted downward; if the voltage of the adjustable power supply is less than the first voltage, the voltage of the adjustable power supply is adjusted upward.

[0055] In step 120, during the period when the adjustable power supply supplies power to the load, the voltage of the adjustable power supply is detected in real time. If the difference between the voltage of the adjustable power supply and the second voltage is less than the second threshold, the adjustable power supply can be directly switched to the second battery. If the difference between the voltage of the adjustable power supply and the second voltage is greater than or equal to the second threshold, the voltage of the adjustable power supply is adjusted until the difference between the voltage of the adjustable power supply and the second voltage is less than the second threshold, and then the second battery is controlled to supply power to the load. Exemplarily, if the voltage of the adjustable power supply is greater than the second voltage, the voltage of the adjustable power supply is adjusted downward; if the voltage of the adjustable power supply is less than the second voltage, the voltage of the adjustable power supply is adjusted upward.

[0056] In step 120, before the vehicle controller switches from the first battery to the adjustable power supply to supply power to the load, it can detect the voltage of the adjustable power supply. When the difference between the voltage of the adjustable power supply and the first voltage is greater than or equal to the first threshold, it can adjust the voltage of the adjustable power supply until the difference between the voltage of the adjustable power supply and the first voltage is less than the first threshold. The vehicle controller can also detect the voltage of the adjustable power supply during the process of the adjustable power supply supplying power to the load. When the difference between the voltage of the adjustable power supply and the second voltage is greater than or equal to the second threshold, it can adjust the voltage of the adjustable power supply until the difference between the voltage of the adjustable power supply and the second voltage is less than the second threshold.

[0057] In some embodiments, steps 110 and 120 can be written as code with specific functional logic and algorithms in a manner familiar to those skilled in the art, and the written code can be compiled to generate a binary file that can run on the vehicle controller. Then, the binary file can be downloaded to the vehicle controller through means such as USB, serial port, network, etc., so that the vehicle controller can execute steps 110 and 120.

[0058] The load refers to the device that receives electrical energy, and the load can convert electrical energy into other forms of energy. Exemplarily, as Figure 10 shown, the load can include but is not limited to the vehicle motor 1012. Among them, the battery can supply power to the vehicle motor 1012 through the motor controller 1011. The motor controller 1011 can convert the direct current provided by the battery into alternating current suitable for the operation of the vehicle motor 1012, and according to the load condition of the motor and instructions such as gear position, throttle, and brake, convert the electrical energy of the battery into the electrical energy required to drive the vehicle motor 1012. Exemplarily, the motor controller 1011 can include at least one bridge arm, the bridge arm includes an upper bridge arm and a lower bridge arm, the vehicle motor 1012 can include at least one winding, and the winding is connected between the upper bridge arm and the lower bridge arm. The positive pole of the battery is connected to the upper bridge arm, and the negative pole of the battery is connected to the lower bridge arm.

[0059] The first threshold can be used to characterize the minimum voltage difference when there is a circulating current between the first battery and the adjustable power supply. The first threshold can be the average value obtained by detecting the minimum voltage difference when there is a circulating current between the first battery and the adjustable power supply multiple times. Exemplarily, according to different battery types, the first threshold can be 0.1V or 0.5V, etc.

[0060] The second threshold can be used to characterize the minimum voltage difference when there is a circulating current between the second battery and the adjustable power supply. The second threshold can be the average value obtained by detecting the minimum voltage difference when there is a circulating current between the second battery and the adjustable power supply multiple times. Exemplarily, according to different battery types, the second threshold can be 0.1V or 0.5V, etc.

[0061] In some embodiments, in step 120, in response to the voltage of the adjustable power supply being adjusted to a difference of 0V from the first voltage, perform the switching from the first battery to the adjustable power supply to supply power to the load, and in response to the voltage during the supply of power to the load by the adjustable power supply being adjusted to a difference of 0V from the second voltage, perform the switching from the adjustable power supply to the second battery to supply power to the load. In this way, the probability of circulating current occurring during the switching process can be greatly reduced.

[0062] In the above technical solution, when the voltage of the first battery is close to or the same as the voltage of the adjustable power supply, switch the first battery to the adjustable power supply. Thus, even if the first battery and the adjustable power supply are briefly connected to the load together when the first battery is switched to the adjustable power supply, the problem of circulating current occurring between the adjustable power supply and the first battery can be greatly improved. Similarly, when the voltage of the adjustable power supply is close to or the same as the voltage of the second battery, switch the adjustable power supply to the second battery. Even if the adjustable power supply and the second battery are briefly connected to the load together when the adjustable power supply is switched to the second battery, the problem of circulating current occurring between the adjustable power supply and the second battery can be greatly improved. Therefore, the problem of relatively serious circulating current generated when the first battery is directly switched to the second battery due to the different voltages of the first battery and the second battery can be improved.

[0063] Reference Figure 3 , according to some embodiments of the present application, in response to the voltage of the adjustable power supply being adjusted to a difference less than the first threshold from the first voltage, perform the switching from the first battery to the adjustable power supply to supply power to the load, including: Step 1201, in response to the voltage of the adjustable power supply being adjusted to a difference less than the first threshold from the first voltage, control the adjustable power supply to supply power to the load; Step 1202, during the supply of power to the load by the adjustable power supply, cut off the power supply of the first battery to the load.

[0064] During the execution of step 1201, keep the connection between the first battery and the load. In the state where the first battery is connected to the load, in response to the voltage of the adjustable power supply being adjusted to a difference less than the first threshold from the first voltage, control the adjustable power supply to start supplying power to the load. At this time, the first battery and the adjustable power supply supply power to the load together.

[0065] In step 1202, after the adjustable power supply starts supplying power to the load, cut off the power supply of the first battery to the load, and the adjustable power supply supplies power to the load alone. In this way, the power supply interruption to the load can be avoided. In the case where the battery is used in a vehicle, the power interruption can be avoided, so that the battery can be switched during the vehicle driving process and the normal driving of the vehicle will not be affected.

[0066] It can be understood that in step 1202, after cutting off the power supply from the first battery to the load, the voltage of the adjustable power supply is adjusted so that the difference between the voltage of the adjustable power supply and the second voltage is less than the second threshold. In this way, during the period when the first battery and the adjustable power supply jointly supply power to the load, the voltage of the adjustable power supply remains the same as or close to the voltage of the first battery, reducing the probability of circulating current occurrence.

[0067] In the above technical solution, after the adjustable power supply starts to supply power to the load, the power supply from the first battery to the load is cut off, which can avoid power interruption to the load. In the case where the battery is used in a vehicle, power interruption can be avoided, so that battery switching can be performed during vehicle driving and normal vehicle driving will not be affected.

[0068] Reference Figure 3 , according to some embodiments of the present application, in response to the voltage during the adjustable power supply supplying power to the load being adjusted to a difference less than the second threshold from the second voltage, performing the switching from the adjustable power supply to the second battery supplying power to the load includes: Step 1203, in response to the voltage during the adjustable power supply supplying power to the load being adjusted to a difference less than the second threshold from the second voltage, controlling the second battery to supply power to the load; Step 1204, during the period when the second battery supplies power to the load, cutting off the power supply from the adjustable power supply to the load.

[0069] During the execution of step 1203, the power supply from the adjustable power supply to the load is maintained. In the state where the adjustable power supply supplies power to the load, in response to the voltage of the adjustable power supply being adjusted to a difference less than the second threshold from the second voltage, the second battery is controlled to start supplying power to the load. At this time, the second battery and the adjustable power supply jointly supply power to the load.

[0070] In step 1204, after the second battery starts to supply power to the load, the power supply from the adjustable power supply to the load is cut off, and the second battery supplies power to the load alone.

[0071] In the above technical solution, power interruption to the load can be avoided. In the case where the battery is used in a vehicle, power interruption can be avoided, so that battery switching can be performed during vehicle driving and normal vehicle driving will not be affected.

[0072] Reference Figure 4 , according to some embodiments of the present application, the method further includes: Step 130, according to the first voltage being equal to the second voltage, during the switching from the first battery to the second battery supplying power to the load, controlling the adjustable power supply to supply power to the load based on the third voltage, and the difference between the third voltage and the first voltage is less than the first threshold.

[0073] In step 130, during the adjustable power supply supplying power to the load, the power supply from the first battery to the load is cut off, and the second battery is controlled to supply power to the load.

[0074] Controlling the adjustable power supply to supply power to the load based on the third voltage means that during the adjustable power supply supplying power to the load, the output voltage of the adjustable power supply is maintained at the third voltage. Exemplarily, the third voltage can be equal to the first voltage.

[0075] In step 130, in response to the voltage of the adjustable power supply being adjusted to the third voltage, the power supply to the load is switched from the first battery to the adjustable power supply. Before performing the switch from the first battery to the adjustable power supply to supply power to the load, the voltage of the adjustable power supply can be detected. If the voltage of the adjustable power supply reaches the third voltage, the first battery can be directly switched to the adjustable power supply. If the voltage of the adjustable power supply does not reach the third voltage, the voltage of the adjustable power supply is adjusted until the voltage of the adjustable power supply reaches the third voltage, and then the adjustable power supply is controlled to supply power to the load.

[0076] Step 130 can also be executed by the vehicle controller. The difference between step 130 and step 120 is that step 130 is executed based on the difference between the first voltage and the second voltage being 0V, step 120 is executed based on the difference between the first voltage and the second voltage being greater than 0V, and in step 130, during the adjustable power supply supplying power to the load, the voltage of the adjustable power supply is not adjusted, while in step 120, during the adjustable power supply supplying power to the load, the voltage of the adjustable power supply is adjusted to make the voltage of the adjustable power supply approach the second voltage of the second battery.

[0077] In step 130, in response to the voltage of the adjustable power supply being adjusted to the third voltage, the adjustable power supply is controlled to start supplying power to the load. During a period of time when the adjustable power supply just starts to supply power to the load, the first battery continues to supply power to the load, that is, the adjustable power supply and the first battery supply power to the load together for a period of time. After that, the power supply from the first battery to the load is disconnected, and while maintaining the adjustable power supply supplying power to the load, the second battery is controlled to supply power to the load. Among them, while maintaining the adjustable power supply supplying power to the load, the step of disconnecting the power supply from the first battery to the load and the step of controlling the second battery to supply power to the load can be executed simultaneously, or the step of disconnecting the power supply from the first battery to the load can be executed first, and then the step of controlling the second battery to supply power to the load can be executed, or the step of controlling the second battery to supply power to the load can be executed first, and then the step of disconnecting the power supply from the first battery to the load can be executed. After the second battery starts to supply power to the load, the power supply from the adjustable power supply to the load is disconnected, so that the power supply interruption to the load can be avoided.

[0078] In the above technical solution, when the first voltage is equal to the second voltage, during the period of switching from the first battery to the second battery to supply power to the load, the adjustable power supply is controlled to supply power to the load based on the third voltage, and during the period when the adjustable power supply supplies power to the load, the power supply of the first battery to the load is cut off, and the second battery is controlled to supply power to the load, which can avoid the problem of power supply interruption during the switching from the first battery to the second battery.

[0079] Reference Figure 5 , according to some embodiments of the present application, the method further includes: Step 140, according to the first voltage being equal to the second voltage, perform a direct switch from the first battery to the second battery to supply power to the load.

[0080] In step 140, before cutting off the power supply of the first battery to the load, the second battery is controlled to supply power to the load.

[0081] Performing a direct switch from the first battery to the second battery to supply power to the load means that during the switching between the first battery and the second battery, the adjustable power supply is not used to supply power to the load.

[0082] In step 140, while maintaining the state of the first battery supplying power to the load, the second battery is controlled to supply power to the load, and after the second battery supplies power to the load, the power supply of the first battery to the load is then disconnected, which can avoid power supply interruption to the load.

[0083] It can be understood that when the first voltage is equal to the second voltage, it is possible to choose to execute step 130 to switch the first battery to be powered by the second battery, or choose to execute step 140 to switch the first battery to be powered by the second battery.

[0084] Step 140 can be executed by the vehicle controller, and the vehicle controller can choose to execute step 120 or step 140 based on whether the difference between the first voltage and the second voltage is 0V.

[0085] In the above technical solution, while maintaining the state of the first battery supplying power to the load, the second battery is controlled to supply power to the load, and after the second battery supplies power to the load, the power supply of the first battery to the load is then disconnected, that is, there is a period when the first battery and the second battery supply power to the load simultaneously, which can avoid power supply interruption to the load. And because the first voltage and the second voltage are equal, even if the first battery and the second battery supply power to the load simultaneously, there will be no circulating current between the first battery and the second battery.

[0086] Reference Figure 7 And Figure 8, According to some embodiments of the present application, the positive electrode of the first battery 100a and the positive electrode of the second battery 100b are connected to the first node P1, the negative electrode of the first battery 100a and the negative electrode of the second battery 100b are connected to the second node P2, and the first node P1 and the second node P2 are respectively connected to the positive electrode and the negative electrode of the load 101; the first battery 100a and the second battery 100b are also connected to the switch module 103, and the switch module 103 is connected to the first node P1 and / or the second node P2. The method includes: Controlling, through the switch module 103, to disconnect between the first battery 100a and the first node P1 and / or the second node P2 to cut off the power supply from the first battery 100a to the load 101; Controlling, through the switch module 103, to connect between the first battery 100a and the first node P1 and the second node P2 to supply power from the first battery 100a to the load 101; Controlling, through the switch module 103, to disconnect between the second battery 100b and the first node P1 and / or the second node P2 to cut off the power supply from the second battery 100b to the load 101; Controlling, through the switch module 103, to connect between the second battery 100b and the first node P1 and the second node P2 to supply power from the second battery 100b to the load 101.

[0087] The first node P1 is connected to the positive electrode of the load 101, and the second node P2 is connected to the negative electrode of the load 101. When the first battery 100a is connected to the first node P1 and the second node P2, the first battery 100a can supply power to the load 101. When the second battery 100b is connected to the first node P1 and the second node P2, the second battery 100b can supply power to the load 101.

[0088] The switch module 103 is used to implement the on / off between the positive electrode of the first battery 100a and the first node P1; or the switch module 103 is used to implement the on / off between the negative electrode of the first battery 100a and the second node P2; or the switch module 103 is used to implement the on / off between the positive electrode of the first battery 100a and the first node P1, and is used to implement the on / off between the negative electrode of the first battery 100a and the second node P2.

[0089] The switch module 103 is further used to implement the on / off between the positive electrode of the second battery 100b and the first node P1; or the switch module 103 is used to implement the on / off between the negative electrode of the second battery 100b and the second node P2; or the switch module 103 is used to implement the on / off between the positive electrode of the second battery 100b and the first node P1, and is used to implement the on / off between the negative electrode of the second battery 100b and the second node P2.

[0090] Exemplarily, as Figure 7As shown, the switch module 103 can connect the positive electrode of the first battery 100a to the first node P1, and connect the positive electrode of the second battery 100b to the first node P2. As Figure 8 shown, the switch module 103 can also connect the negative electrode of the first battery 100a to the second node P2, and connect the negative electrode of the second battery 100b to the second node P2.

[0091] It can be understood that when the positive electrode of the load 101 is connected to the first node P1 and the negative electrode of the load 101 is connected to the second node P2, the switch module 103 is used to control the disconnection between the first battery 100a and the first node P1 and / or the second node P2, so that the first battery 100a is disconnected from the battery, and thus the power supply from the first battery 100a to the load 101 can be cut off. Similarly, the switch module 103 is used to control the disconnection between the second battery 100b and the first node P1 and / or the second node P2, so that the second battery 100b is disconnected from the battery, and thus the power supply from the second battery 100b to the load 101 can be cut off.

[0092] During the execution of steps 1201, 1202, 1203, 1204, 130, and 140, the switch module 103 can be used to supply power from the first battery 100a or the second battery 100b to the load 101, or cut off the power supply from the first battery 100a or the second battery 100b to the load 101.

[0093] In some embodiments, the switch module 103 includes a first switch unit and a second switch unit. The first switch unit connects the positive electrode of the first battery 100a to the first node P1; or the first switch unit connects the negative electrode of the first battery 100a to the second node P2. The second switch unit connects the positive electrode of the second battery 100b to the first node P1; or the second switch unit connects the negative electrode of the second battery 100b to the second node P2. The first switch unit and the second switch unit can include, but are not limited to, switch elements such as relays. As an example, Figure 9 and Figure 10 illustrates the case where the first switch unit 1031 connects the negative electrode of the first battery 100a to the second node P2, and the second switch unit 1032 connects the negative electrode of the second battery 100b to the second node P2.

[0094] It should be noted that when the first switching unit connects the positive electrode of the first battery 100a and the first node P1, the negative electrode of the first battery 100a can be directly connected to the second node P2. When the first switching unit connects the negative electrode of the first battery 100a and the second node P2, the positive electrode of the first battery 100a can be directly connected to the first node P1. When the second switching unit connects the positive electrode of the second battery 100b and the first node P1, the negative electrode of the second battery 100b can be directly connected to the second node P2. When the second switching unit connects the negative electrode of the second battery 100b and the second node P2, the positive electrode of the second battery 100b can be directly connected to the first node P1.

[0095] As Figure 10 shown, in some embodiments, the first node P1 can also be connected to the main relay K1. The first node P1 is connected to the positive electrode of the load through the main relay K1, and the second node P2 can be directly connected to the negative electrode of the load. Wherein, the first end of the main relay K1 is connected to the first node P1, and the second end of the main relay K1 is connected to the positive electrode of the load. When the main relay K1 is closed, it controls the first node P1 to be connected to the positive electrode of the load. It can be understood that the main relay K1 is closed before starting to supply power to the load, and during the entire power supply process, including the period when the first battery 100a is switched to the second battery 100b, the main relay K1 always remains closed so that the first node P1 and the second node P2 remain connected to the load. In this way, only by controlling the on / off of the first battery 100a and the first node P1 / second node P2 through the switch module 103, and controlling the on / off of the second battery 100b and the first node P1 / second node P2, the on / off of the first battery 100a supplying power to the load and the on / off of the second battery 100b supplying power to the load can be realized.

[0096] In some embodiments, a precharge control circuit is connected in parallel at both ends of the main relay K1. Before closing the main relay K1, the precharge control circuit is connected in series with the first battery 100a to form a precharge loop. The precharge control circuit can include a series-connected precharge relay K2 and a precharge resistor R.

[0097] Exemplarily, before starting to supply power to the load, first close the precharge relay K2 and the first switching unit, and disconnect the main relay K1 and the second switching unit, so that the precharge control circuit is connected in series with the first battery 100a to form a precharge loop. Through the precharge loop, the capacitor C1 connected in parallel with the load can be precharged, avoiding the problem of damage to the battery caused by a large charging current generated instantaneously when the first battery 100a and the load are connected. After the capacitor C1 is precharged through the precharge loop, close the main relay K1, disconnect the precharge relay K2, and keep the first switching unit closed and the second switching unit disconnected, so that the first battery 100a starts to supply power to the load.

[0098] When the first battery 100a experiences overheating, a fault, or the state of charge (SOC) of the first battery 100a is lower than 2%, or the optimal drive voltage feedback based on the load 101 changes, steps 110 and 120 are executed.

[0099] Exemplarily, during the execution of step 1201, the first switch unit 1031 is kept closed and the second switch unit 1032 is kept open to maintain the state where the first battery 100a supplies power to the load alone.

[0100] During the execution of step 1202, after the adjustable power supply 102 starts to supply power to the load, the first switch unit 1031 is disconnected and the second switch unit 1032 is kept open so that the adjustable power supply 102 supplies power to the load alone.

[0101] During the execution of step 1203, while maintaining the supply of power from the adjustable power supply 102 to the load, the second switch unit 1032 is closed and the first switch unit 1031 is kept open so that the second battery 100b is connected to the load and supplies power to the load 101.

[0102] During the execution of step 1204, the second switch unit 1032 is kept closed and the first switch unit 1031 is kept open. While maintaining the state where the second battery 100b supplies power to the load, the supply of power from the adjustable power supply 102 to the load is cut off so that the second battery 100b supplies power to the load alone.

[0103] In some embodiments, the first node P1 is also connected to the charging positive relay K21, and the second node P2 is also connected to the charging negative relay K22. The charging positive relay K21 is used to connect to the positive pole of the external charging device 104, and the charging negative relay K22 is used to connect to the negative pole of the external charging device 104. The external charging device 104 may include, but is not limited to, charging piles, chargers, and other devices capable of charging the battery.

[0104] When both the first switch unit and the second switch unit are closed, closing the positive charging relay K21 and the negative charging relay K22 enables the external charging device 104 to charge the parallel-connected first battery 100a and second battery 100b. When the first switch unit is closed and the second switch unit is open, closing the positive charging relay K21 and the negative charging relay K22 causes the external charging device 104 to charge the first battery 100a alone. When the first switch unit is open and the second switch unit is closed, closing the positive charging relay K21 and the negative charging relay K22 causes the external charging device 104 to charge the second battery 100b alone. That is to say, through the first switch unit and the second switch unit, multiple charging methods can be achieved. When the first battery 100a and the second battery 100b are charged separately, there will be no mutual influence, and thus it will not affect the full charge and full discharge of the separately charged first battery 100a or second battery 100b, improving the charging efficiency.

[0105] In the above technical solution, the positive electrodes of the first battery 100a and the second battery 100b are both connected to the first node P1, and the negative electrodes of the first battery 100a and the second battery 100b are both connected to the second node P2. Moreover, the switch module 103 can control the on / off between the first battery 100a and the first node P1 and / or the second node P2, and control the on / off between the second battery 100b and the first node P1 and / or the second node P2. In this way, through the switch module 103, the first battery 100a and the second battery 100b can supply power to the load 101 separately or in parallel, and thus can meet the different power supply requirements of the load 101, improving the reliability of power supply to the load 101.

[0106] According to some embodiments of the present application, the method further includes: Under the first working condition, through the switch module 103, supply power to the load 101 by the first battery 100a or the second battery 100b; Under the second working condition, through the switch module 103, control the connection between the first battery 100a and the first node P1 and the second node P2, and the connection between the second battery 100b and the first node P1 and the second node P2, so as to supply power to the load 101 jointly by the first battery 100a and the second battery 100b.

[0107] The first working condition may be a situation where the separate power supply of the first battery 100a or the second battery 100b is sufficient to meet the requirements of the load 101, that is, a situation where the current required by the load 101 is small. The second working condition may be a situation where the current required by the load 101 is large and the voltages of the first battery 100a and the second battery 100b are the same.

[0108] In the first working condition, the power supply to the load 101 can be switched from the first battery 100a to the second battery 100b by the above-mentioned steps 110 and 120, or can be switched from the first battery 100a to the second battery 100b to supply power to the load 101 by the above-mentioned steps 110 and 130, or the first battery 100a can be switched to the second battery 100b to supply power to the load 101 by the above-mentioned steps 110 and 140.

[0109] In the second working condition, the first switch unit and the second switch unit can be controlled to be closed so that the first battery 100a and the second battery 100b are in parallel. Before starting to supply power to the load 101, the pre-charge relay K2, the first switch unit and the second switch unit can be first closed so that the pre-charge control circuit is connected in series with the first battery 100a and the second battery 100b in parallel to form a pre-charge loop. After the pre-charge is completed, the main relay K1 is closed, the pre-charge relay K2 is disconnected, and the first switch unit and the second switch unit are kept closed, so that the first battery 100a and the second battery 100b are in parallel to supply power to the load 101.

[0110] In the above technical solution, through the switch module 103, different modes of power supply to the load 101 are realized under different working conditions, meeting the different power supply requirements of the load 101 and improving the reliability of power supply to the load 101.

[0111] Reference Figure 10 , according to some embodiments of the present application, the adjustable power supply 102 includes a bidirectional DC-DC (Direct Current - Direct Current) converter and a power supply module 1022. The first end of the bidirectional DC-DC converter 1021 is connected to the power supply module 1022 to adjust the voltage output by the power supply module 1022, and the second end of the bidirectional DC-DC converter 1021 is connected to the load.

[0112] In response to the voltage of the adjustable power supply 102 being adjusted to a difference less than the first threshold from the first voltage, performing the switching from the first battery 100a to the adjustable power supply 102 to supply power to the load, including: in response to the bidirectional DC-DC converter 1021 adjusting the voltage output by the power supply module 1022 to a difference less than the first threshold from the first voltage, controlling the power supply module 1022 to supply power to the load via the DC-DC converter.

[0113] In response to the voltage during power supply to the load by the adjustable power supply 102 being regulated to a difference from the second voltage that is less than the second threshold, perform the switching from the adjustable power supply 102 to the second battery 100b for power supply to the load, including: in response to the bidirectional DC-DC converter 1021 regulating the voltage output by the power supply module 1022 to a difference from the second voltage that is less than the second threshold, control the bidirectional DC-DC converter 1021 to charge the power supply module 1022.

[0114] The bidirectional DC-DC converter 1021 can regulate the voltage transmitted by the external power supply and then transmit it to the power supply module 1022, or can regulate the voltage output by the power supply module 1022 and then output it to the load.

[0115] The power supply module 1022 refers to a device capable of outputting electric energy. Exemplarily, the power supply module 1022 can include but is not limited to a low-voltage battery. Exemplarily, the low-voltage battery can be a low-voltage storage battery, and the low-voltage storage battery can include but is not limited to a 12V lithium battery or a 12V lead-acid battery, etc. The bidirectional DC-DC converter 1021 can be connected to the positive and negative electrodes of the low-voltage battery to regulate the voltage output by the low-voltage battery.

[0116] In the case where the first battery 100a and the second battery 100b are used for vehicle power supply, the vehicle controller can control the bidirectional DC-DC converter 1021 to output the voltage output by the power supply module 1022 to the load 101, or control the bidirectional DC-DC converter 1021 to output a voltage to the power supply module 1022 to charge the power supply module 1022. In the case of controlling the bidirectional DC-DC converter 1021 to charge the power supply module 1022, the power supply module 1022 stops supplying power to the load 101 through the bidirectional DC-DC converter 1021, and thus disconnects the power supply from the adjustable power supply 102 to the load 101. It should be noted that since the vehicle controller can control the direction of the voltage output by the bidirectional DC-DC converter 1021 to achieve power supply from the adjustable power supply 102 to the load 101 or cut off the power supply from the adjustable power supply 102 to the load 101, the state of the second end of the bidirectional DC-DC converter 1021 connected to the load 101 can be kept unchanged.

[0117] Exemplarily, in the step of performing the switching from the first battery 100a to the adjustable power supply 102 for power supply to the load 101, the vehicle controller controls the bidirectional DC-DC converter 1021 to receive the voltage output by the power supply module 1022 and regulate the voltage output by the power supply module 1022. The vehicle controller also controls the bidirectional DC-DC converter 1021 to output the regulated voltage output by the power supply module 1022 to the load 101 in response to the bidirectional DC-DC converter 1021 regulating the voltage output by the power supply module 1022 to a difference from the first voltage that is less than the first threshold.

[0118] In the step of switching from the adjustable power supply 102 to the second battery 100b to supply power to the load 101, in response to the bidirectional DC-DC converter 1021 adjusting the voltage output by the power supply module 1022 to be less than the second threshold value from the second voltage, the vehicle controller controls the bidirectional DC-DC converter 1021 to transmit the voltage to the power supply module 1022.

[0119] It can be understood that in the embodiment of the present application, after the second battery 100b starts to supply power to the load 101, the bidirectional DC-DC converter 1021 is controlled to charge the power supply module 1022. At this time, the second battery 100b is connected to the positive and negative electrodes of the load 101, and the second terminal of the bidirectional DC-DC converter 1021 is connected to the positive and negative electrodes of the load 101. Therefore, the second terminal of the bidirectional DC-DC converter 1021 is equivalent to being connected to the positive and negative electrodes of the second battery 100b, and the voltage output by the second battery 100b will also be transmitted to the second terminal of the bidirectional DC-DC converter 1021. The bidirectional DC-DC converter 1021 can adjust the voltage output by the second battery 100b and then transmit it to the power supply module 1022 to charge the power supply module 1022.

[0120] In the above technical solution, an adjustable power supply 102 is formed by the bidirectional DC-DC converter 1021 and the power supply module 1022, so that during the switching from the first battery 100a to the second battery 100b, the bidirectional DC-DC converter 1021 can adjust the voltage output by the power supply module 1022 and then input it to the load 101 to supply power to the load 101, thereby being able to improve the circulating current problem caused by direct switching when the voltage difference between the first battery 100a and the second battery 100b is too large. Moreover, when there is no need for the adjustable power supply 102 to supply power to the load 101, it is only necessary to control the bidirectional DC-DC converter 1021 to charge the power supply module 1022. The structure is simple, and the control method is relatively simple.

[0121] Reference Figure 6, embodiments of the present application provide a power supply circuit, which includes: multiple batteries, an adjustable power supply 102, and a control module 105. The control module 105 is configured to: obtain a first voltage of a first battery 100a that currently supplies power to a load 101 and a second voltage of a second battery 100b to be switched among the multiple batteries; according to the difference between the first voltage and the second voltage being greater than 0V, during the period of switching from the first battery 100a to the second battery 100b to supply power to the load 101, use the adjustable power supply 102 to supply power to the load 101; wherein, the control module 105 responds to the voltage of the adjustable power supply 102 being adjusted to a difference less than a first threshold with the first voltage, and executes switching from the first battery 100a to the adjustable power supply 102 to supply power to the load 101, and, responds to the voltage during the period of the adjustable power supply 102 supplying power to the load 101 being adjusted to a difference less than a second threshold with the second voltage, and executes switching from the adjustable power supply 102 to the second battery 100b to supply power to the load 101.

[0122] The number of the multiple batteries can be 2, 3, 4 or more, and each battery can be connected to the load 101 to supply power to the load 101. When the number of batteries is 2, the battery that currently supplies power to the load 101 is the first battery 100a, and the remaining other battery is the second battery 100b to be switched. When the number of batteries is greater than 2, the battery that currently supplies power to the load 101 is the first battery 100a, and the battery to be switched among the remaining batteries is the second battery 100b. The adjustable power supply 102 refers to a power supply with an adjustable output voltage.

[0123] As Figure 10 shown, the load may include, but is not limited to, a vehicle motor 1012. Wherein, the battery can supply power to the vehicle motor 1012 through a motor controller 1011, and the motor controller 1011 can convert the direct current provided by the battery into alternating current suitable for the operation of the vehicle motor 1012, and convert the electrical energy of the battery into the electrical energy required to drive the vehicle motor 1012 according to instructions such as gear position, throttle, and brake according to the load condition of the motor.

[0124] The control module 105 can be a vehicle controller, which can be connected to the BMS. The BMS can diagnose whether the first battery 100a has overheated, malfunctioned, or its SOC is lower than 2%. The BMS can also diagnose whether the status of the second battery 100b is normal. For example, it can detect whether the second battery 100b has overheated, malfunctioned, or its SOC is lower than 2%, etc. The BMS can also obtain the voltages of the first battery 100a and the second battery 100b. The BMS can send the data of the first battery 100a and the second battery 100b to the vehicle controller, including the voltages, temperatures, SOCs, and fault statuses of the first battery 100a and the second battery 100b. Based on the data received that the first battery 100a has overheated, malfunctioned, or its SOC is lower than 2%, the vehicle controller detects the status of the second battery 100b. If the status of the second battery 100b is normal, and according to the difference between the first voltage and the second voltage being greater than 0V, it executes the switch from the first battery 100a to the second battery 100b to supply power to the load 101. During the switch from the first battery 100a to the second battery 100b to supply power to the load 101, the adjustable power supply 102 is used to supply power to the load 101. If the vehicle controller detects that the status of the second battery 100b is abnormal, it controls the first battery 100a to continue to supply power to the load 101. The method for the control module 105 to execute the switch from the first battery 100a to the second battery 100b to supply power to the load 101 can refer to the relevant descriptions in the above embodiments and will not be elaborated here.

[0125] In the above technical solution, when the voltage of the first battery 100a is close to or the same as the voltage of the adjustable power supply 102, the first battery 100a is switched to the adjustable power supply 102. In this way, even if the first battery 100a and the adjustable power supply 102 are briefly connected to the load 101 together when the first battery 100a is switched to the adjustable power supply 102, the problem of circulating current occurring between the adjustable power supply 102 and the first battery 100a can be greatly improved. Similarly, when the voltage of the adjustable power supply 102 is close to or the same as the voltage of the second battery 100b, the adjustable power supply 102 is switched to the second battery 100b. Even if the adjustable power supply 102 and the second battery 100b are briefly connected to the load 101 together when the adjustable power supply 102 is switched to the second battery 100b, the problem of circulating current occurring between the adjustable power supply 102 and the second battery 100b can be greatly improved. Thus, the problem of relatively serious circulating current generated when the first battery 100a is directly switched to the second battery 100b due to the different voltages of the first battery 100a and the second battery 100b can be improved.

[0126] According to some embodiments of the present application, the control module 105 is further configured to: in response to the voltage of the adjustable power supply 102 being adjusted to a difference less than a first threshold from a first voltage, control the adjustable power supply 102 to supply power to the load 101, and during the period when the adjustable power supply 102 supplies power to the load 101, cut off the power supply from the first battery 100a to the load 101, so as to perform the switching from the first battery 100a to the adjustable power supply 102 to supply power to the load 101.

[0127] That is to say, the control module 105 can perform step 1201 and step 1202 in the above embodiments. The methods for performing step 1201 and step 1202 can refer to the relevant descriptions in the above embodiments and will not be elaborated here.

[0128] In the above technical solution, after the adjustable power supply 102 starts to supply power to the load 101, the control module 105 cuts off the power supply from the first battery 100a to the load 101, which can avoid the interruption of power supply to the load 101. In the case where the battery is used in a vehicle, it can avoid the interruption of power, so that the battery can be switched during the vehicle driving process and will not affect the normal driving of the vehicle.

[0129] According to some embodiments of the present application, the control module 105 is further configured to: in response to the voltage during the period when the adjustable power supply 102 supplies power to the load 101 being adjusted to a difference less than a second threshold from a second voltage, control the second battery 100b to supply power to the load 101, and during the period when the second battery 100b supplies power to the load 101, cut off the power supply from the adjustable power supply 102 to the load 101, so as to perform the switching from the adjustable power supply 102 to the second battery 100b to supply power to the load 101.

[0130] That is to say, the control module 105 can perform step 1203 and step 1204 in the above embodiments. The methods for performing step 1203 and step 1204 can refer to the relevant descriptions in the above embodiments and will not be elaborated here.

[0131] In the above technical solution, during the period when the second battery 100b supplies power to the load 101, the control module 105 cuts off the power supply from the adjustable power supply 102 to the load 101, which can avoid the interruption of power supply to the load 101. In the case where the battery is used in a vehicle, it can avoid the interruption of power, so that the battery can be switched during the vehicle driving process and will not affect the normal driving of the vehicle.

[0132] According to some embodiments of the present application, the control module 105 is further configured to: based on the first voltage being equal to the second voltage, during the period of switching from the first battery 100a to the second battery 100b to supply power to the load 101, control the adjustable power supply 102 to supply power to the load 101 based on a third voltage, the difference between the third voltage and the first voltage being less than a first threshold; wherein, the control module 105 is configured to cut off the power supply of the first battery 100a to the load 101 during the period when the adjustable power supply 102 supplies power to the load 101, and control the second battery 100b to supply power to the load 101.

[0133] That is to say, the control module 105 can execute step 130 in the above embodiments. The method of executing step 130 can refer to the relevant descriptions in the above embodiments and will not be elaborated here.

[0134] In the above technical solution, when the control module 105 detects that the first voltage is equal to the second voltage, during the period of switching from the first battery 100a to the second battery 100b to supply power to the load 101, it controls the adjustable power supply 102 to supply power to the load 101 based on the third voltage, and during the period when the adjustable power supply 102 supplies power to the load 101, cuts off the power supply of the first battery 100a to the load 101 and controls the second battery 100b to supply power to the load 101, which can avoid the problem of power supply interruption during the switching from the first battery 100a to the second battery 100b.

[0135] According to some embodiments of the present application, the control module 105 is further configured to: based on the first voltage being equal to the second voltage, perform a direct switch from the first battery 100a to the second battery 100b to supply power to the load 101, wherein the control module 105 is configured to control the second battery 100b to supply power to the load 101 before cutting off the power supply of the first battery 100a to the load 101.

[0136] That is to say, the control module 105 can also execute step 140 in the above embodiments. The method of executing step 140 can refer to the relevant descriptions in the above embodiments and will not be elaborated here. It should be noted that when the control module 105 detects that the first voltage is equal to the second voltage, it can choose to execute either step 130 or step 140 to achieve the switching of the power supply from the first battery 100a to the second battery 100b to the load 101.

[0137] In the above technical solution, when the control module 105 controls the first battery 100a to supply power to the load 101, it controls the second battery 100b to supply power to the load 101. After the second battery 100b supplies power to the load 101, the power supply of the first battery 100a to the load 101 is then disconnected. That is, there is a period when the first battery 100a and the second battery 100b supply power to the load 101 simultaneously, which can avoid power interruption to the load 101. And because the first voltage and the second voltage are equal, even if the first battery 100a and the second battery 100b supply power to the load 101 simultaneously, there will be no circulating current between the first battery 100a and the second battery 100b.

[0138] According to some embodiments of the present application, among multiple batteries, the positive electrode of each battery is connected to the first node P1, and the negative electrode of each battery is connected to the second node P2. The first node P1 and the second node P2 are respectively used to connect to the positive electrode and the negative electrode of the load 101; the power supply circuit further includes: a switch module, connected to the battery, and the switch module is also connected to the first node P1 and / or the second node P2. The control module 105 is configured to: control the on / off between the battery and the first node P1 and / or the second node P2 through the switch module.

[0139] The switch module 103 can be used to achieve the on / off between the positive electrode of the battery and the first node P1; or the switch module 103 is used to achieve the on / off between the negative electrode of the battery and the second node P2; or the switch module 103 is used to achieve the on / off between the positive electrode of the battery and the first node P1, and is used to achieve the on / off between the negative electrode of the battery and the second node P2.

[0140] Exemplarily, as Figure 7 shown, the switch module 103 can connect the positive electrode of the first battery 100a and the first node P1, and connect the positive electrode of the second battery 100b and the first node P2. As Figure 8 shown, the switch module 103 can also connect the negative electrode of the first battery 100a and the second node P2, and connect the negative electrode of the second battery 100b and the second node P2. Figure 7 and Figure 8 As a schematic illustration, the connection of the first battery and the second battery to the switch module is shown. In the case where the number of batteries is greater than 2, the connection manner of the remaining batteries to the switch module can be the same as the connection manner of the first battery and the second battery to the switch module.

[0141] For multiple batteries, the switch module 103 can be used to achieve the on / off between the positive electrode of each battery and the first node P1; or the switch module 103 is used to achieve the on / off between the negative electrode of each battery and the second node P2; or the switch module 103 is used to achieve the on / off between the positive electrodes of some of the multiple batteries and the first node P1, and is used to achieve the on / off between the negative electrodes of the remaining part of the multiple batteries and the second node P2.

[0142] In other words, the switch module 103 can be used to control the connection and disconnection between each battery and the first node P1 and the second node P2. When the number of batteries is 3 or more, when no switching is required, the switch module 103 can control the first battery 100a that is currently supplying power to be connected to the first node P1 and the second node P2, and the remaining batteries are disconnected from the first node P1 and the second node P2. When switching is required, the switch module 103 can switch the connection and disconnection between the first battery 100a and the second battery 100b and the first node P1 and the second node P2, and keep the remaining batteries other than the first battery 100a and the second battery 100b among the multiple batteries disconnected from the first node P1 and the second node P2.

[0143] In the above technical solution, the positive electrodes of the first battery 100a and the second battery 100b are both connected to the first node P1, the negative electrodes of the first battery 100a and the second battery 100b are both connected to the second node P2, and the switch module 103 can control the connection and disconnection between the first battery 100a and the first node P1 and / or the second node P2, and control the connection and disconnection between the second battery 100b and the first node P1 and / or the second node P2. In this way, through the switch module 103, the first battery 100a and the second battery 100b can supply power to the load 101 respectively, or supply power to the load 101 in parallel, thereby being able to meet different power supply requirements of the load 101 and improving the reliability of power supply to the load 101.

[0144] According to some embodiments of the present application, the switch module 103 includes: a plurality of switch units, and the plurality of switch units are connected to the plurality of batteries in one-to-one correspondence, wherein the switch unit is connected to the positive electrode of the battery and the first node P1, or connected to the negative electrode of the battery and the second node P2.

[0145] The control module 105 can control the closing or opening of the switch unit to realize the connection and disconnection between the battery and the first node P1 and / or the second node P2. When the switch unit is connected to the positive electrode of the battery and the first node P1, the negative electrode of the battery is directly connected to the second node P2. When the switch unit is connected to the negative electrode of the battery and the second node P2, the positive electrode of the battery is directly connected to the first node P1. The switch units corresponding to some of the multiple batteries can be connected to the positive electrode of the battery and the first node P1, and the switch units corresponding to the remaining part of the batteries can be connected to the negative electrode of the battery and the second node P2. The switch unit can include, but is not limited to, switch elements such as relays.

[0146] The switch unit connected to the first battery 100a can be denoted as the first switch unit, and the switch unit connected to the second battery 100b can be denoted as the second switch unit. As an example, Figure 9 and Figure 10The figure shows a situation where the first switch unit 1031 connects the negative electrode of the first battery 100a and the second node P2, and the second switch unit 1032 connects the negative electrode of the second battery 100b and the second node P2.

[0147] When switching is not required, the control module 105 can control the first switch unit to close and the second switch unit and the other switch units to turn off, so that the currently power - supplying first battery 100a is connected to the first node P1 and the second node P2, and the other batteries are disconnected from the first node P1 and / or the second node P2.

[0148] When switching is required, the control module 105 controls the first switch unit and the second switch unit to switch on, and the other switch units remain off.

[0149] When performing the above - mentioned steps 1201, step 1202, step 1203, step 1204, step 130, and step 140, the first battery 100a or the second battery 100b can supply power to the load 101 through the first switch unit and the second switch unit, or the power supply from the first battery 100a or the second battery 100b to the load 101 can be cut off. The method of performing the above - mentioned steps 1201, step 1202, step 1203, step 1204, step 130, and step 140 through the first switch unit and the second switch unit can refer to the relevant descriptions in the above - mentioned embodiments and will not be elaborated here.

[0150] Reference Figure 10 , in some embodiments, the circuit may further include a main relay K1. The first node P1 may also be connected to the main relay K1. The first node P1 is connected to the positive electrode of the load 101 through the main relay K1, and the second node P2 may be directly connected to the negative electrode of the load 101. Among them, the first end of the main relay K1 is connected to the first node P1, and the second end of the main relay K1 is connected to the positive electrode of the load 101.

[0151] In some embodiments, a pre - charge control circuit is connected in parallel at both ends of the main relay K1. Before closing the main relay K1, the pre - charge control circuit is connected in series with the first battery 100a to form a pre - charge loop. The pre - charge control circuit may include a series - connected pre - charge relay K2 and a pre - charge resistor R.

[0152] In some embodiments, the circuit may further include a charging positive relay K21 and a charging negative relay K22. The first node P1 is also connected to the charging positive relay K21, and the second node P2 is also connected to the charging negative relay K22. The charging positive relay K21 is used to connect to the positive electrode of the external charging device 104, and the charging negative relay K22 is used to connect to the negative electrode of the external charging device 104.

[0153] For the functions and usage methods of the main relay K1, pre-charge control circuit, charging positive relay K21, and charging negative relay K22, reference can be made to the relevant descriptions in the above embodiments, which will not be elaborated here.

[0154] In the above technical solution, by setting the switch unit to connect the positive electrode of the battery to the first node P1 or connect the negative electrode of the battery to the second node P2, the on-off between the battery and the first node P1 and the second node P2 is realized. The structure is simple and easy to control, thereby improving the reliability of switching the first battery 100a to the second battery 100b to supply power to the load 101.

[0155] According to some embodiments of the present application, the control module 105 is further configured to: in the first working condition, switch from the first battery 100a to the second battery 100b to supply power to the load 101 through the switch module 103; in the second working condition, control at least two of the multiple batteries to be connected to the first node P1 and the second node P2 through the switch module 103 to supply power to the load 101 jointly by at least two batteries.

[0156] The definitions of the first working condition and the second working condition can refer to the relevant descriptions in the above embodiments, which will not be elaborated here.

[0157] In the first working condition, the control module 105 can switch from the first battery 100a to the second battery 100b to supply power to the load 101 by executing the above step 110 and step 120, or can switch from the first battery 100a to the second battery 100b to supply power to the load 101 by executing the above step 110 and step 130, or can also execute switching from the first battery 100a to the second battery 100b to supply power to the load 101 by executing the above step 110 and step 140.

[0158] In the second working condition, the control module 105 can control at least two batteries to be connected in parallel to supply power to the load 101 jointly. Exemplarily, the first battery 100a and the second battery 100b can be connected in parallel to supply power to the load 101 jointly, or all the batteries can be connected in parallel to supply power to the load 101. The number of parallel-connected batteries can be adjusted according to the power consumption requirements of the load 101.

[0159] In the above technical solution, through the switch module 103, different modes of power supply to the load 101 are realized under different working conditions, meeting the different power supply requirements of the load 101 and improving the reliability of power supply to the load 101.

[0160] Reference Figure 10, according to some embodiments of the present application, the adjustable power supply 102 includes a bidirectional DC-DC converter 1021 and a power supply module 1022. The first end of the bidirectional DC-DC converter 1021 is connected to the power supply module 1022 to adjust the voltage output by the power supply module 1022. The second end of the bidirectional DC-DC converter 1021 is connected to the load 101. The control module 105 is configured to: in response to the bidirectional DC-DC converter 1021 adjusting the voltage output by the power supply module 1022 such that the difference from the first voltage is less than the first threshold, control the power supply module 1022 to supply power to the load 101 via the DC-DC converter; and, in response to the bidirectional DC-DC converter 1021 adjusting the voltage output by the power supply module 1022 such that the difference from the second voltage is less than the second threshold, control the bidirectional DC-DC converter 1021 to charge the power supply module 1022.

[0161] That is to say, the above steps 120 and the above step 130 can be executed by the bidirectional DC-DC converter 1021 and the power supply module 1022. The method of executing the above steps 120 and step 130 by the bidirectional DC-DC converter 1021 and the power supply module 1022 can refer to the relevant descriptions in the above embodiments and will not be elaborated here.

[0162] The power supply module 1022 refers to a device capable of outputting electric energy. Exemplarily, the power supply module 1022 may include, but is not limited to, a low-voltage battery. Exemplarily, the low-voltage battery may be a 12V lithium battery or a 12V lead-acid battery.

[0163] In the above technical solution, the adjustable power supply 102 is formed by the bidirectional DC-DC converter 1021 and the power supply module 1022, such that during the switching from the first battery 100a to the second battery 100b, the bidirectional DC-DC converter 1021 can adjust the voltage output by the power supply module 1022 and then input it to the load 101 to supply power to the load 101, thereby being able to improve the circulating current problem caused by directly switching when the voltage difference between the first battery 100a and the second battery 100b is too large. And, when there is no need for the adjustable power supply 102 to supply power to the load 101, it is only necessary to control the bidirectional DC-DC converter 1021 to charge the power supply module 1022. The structure is simple and the control method is relatively simple.

[0164] The embodiment of the present application provides a battery system including the power supply circuit in the above embodiment.

[0165] The battery system may include a BMS. The battery system has the beneficial effects of the power supply circuit provided by the embodiment of the present application. For the specific description of the power supply circuit, reference can be made to the above embodiments and will not be elaborated here.

[0166] An embodiment of the present application provides an electrical device, which includes the battery system in the above embodiment, and the battery system supplies power to the electrical device.

[0167] The electrical device may have a load, and the battery system is used to supply power to the load. The electrical device may refer to the relevant descriptions in the above embodiments and will not be elaborated here.

[0168] An embodiment of the present application provides an energy storage device, which includes the battery system in the above embodiment, and the battery system is used to store electrical energy.

[0169] The energy storage device has the beneficial effects of the battery system provided by the embodiment of the present application. Specifically, reference can be made to the specific descriptions of the battery system in the above embodiments and will not be elaborated here.

[0170] An embodiment of the present application provides a power supply method, and the method includes: Step 110, obtaining a first voltage of a first battery 100a currently supplying power to a load 101 and a second voltage of a second battery 100b to be switched; Step 120, according to the difference between the first voltage and the second voltage being greater than 0V, during the period of switching from the first battery 100a to the second battery 100b to supply power to the load 101, using an adjustable power supply 102 to supply power to the load 101, wherein, in response to the voltage of the adjustable power supply 102 being adjusted to a difference less than a first threshold from the first voltage, performing the switching from the first battery 100a to the adjustable power supply 102 to supply power to the load 101; in response to the voltage of the adjustable power supply 102 during the period of supplying power to the load 101 being adjusted to a difference less than a second threshold from the second voltage, performing the switching from the adjustable power supply 102 to the second battery 100b to supply power to the load 101.

[0171] In response to the voltage of the adjustable power supply 102 being adjusted to a difference less than a first threshold from the first voltage, performing the switching from the first battery 100a to the adjustable power supply 102 to supply power to the load 101 includes: Step 1201, in response to the voltage of the adjustable power supply 102 being adjusted to a difference less than a first threshold from the first voltage, controlling the adjustable power supply 102 to supply power to the load 101; Step 1202, during the period when the adjustable power supply 102 supplies power to the load 101, cutting off the power supply of the first battery 100a to the load 101.

[0172] In response to the voltage of the adjustable power supply 102 during the period of supplying power to the load 101 being adjusted to a difference less than a second threshold from the second voltage, performing the switching from the adjustable power supply 102 to the second battery 100b to supply power to the load 101 includes: Step 1203: In response to the voltage difference between the voltage during the power supply of the adjustable power supply 102 to the load 101 and the second voltage being less than the second threshold, control the second battery 100b to supply power to the load 101. Step 1204: During the power supply of the second battery 100b to the load 101, cut off the power supply of the adjustable power supply 102 to the load 101.

[0173] The adjustable power supply 102 includes a bidirectional DC-DC converter 1021 and a power supply module 1022. The first end of the bidirectional DC-DC converter 1021 is connected to the power supply module 1022 to adjust the voltage output by the power supply module 1022, and the second end of the bidirectional DC-DC converter 1021 is connected to the load 101.

[0174] Step 1201 includes: In response to the voltage difference between the voltage output by the power supply module 1022 adjusted by the bidirectional DC-DC converter 1021 and the first voltage being less than the first threshold, control the power supply module 1022 to supply power to the load 101 via the DC-DC converter.

[0175] Step 1202 includes: In response to the voltage difference between the voltage output by the power supply module 1022 adjusted by the bidirectional DC-DC converter 1021 and the second voltage being less than the second threshold, control the bidirectional DC-DC converter 1021 to charge the power supply module 1022.

[0176] The method may further include: Step 130: According to the first voltage being equal to the second voltage, during the switching from the first battery 100a to the second battery 100b to supply power to the load 101, control the adjustable power supply 102 to supply power to the load 101 based on a third voltage, and the voltage difference between the third voltage and the first voltage is less than the first threshold.

[0177] In step 130, during the power supply of the adjustable power supply 102 to the load 101, cut off the power supply of the first battery 100a to the load 101, and control the second battery 100b to supply power to the load 101.

[0178] The method may further include: Step 140: According to the first voltage being equal to the second voltage, perform a direct switch from the first battery 100a to the second battery 100b to supply power to the load 101.

[0179] In step 140, before cutting off the power supply of the first battery 100a to the load 101, control the second battery 100b to supply power to the load 101.

[0180] The positive electrode of the first battery 100a and the positive electrode of the second battery 100b are connected to the first node P1, the negative electrode of the first battery 100a and the negative electrode of the second battery 100b are connected to the second node P2, and the first node P1 and the second node P2 are respectively connected to the positive electrode and the negative electrode of the load 101. The first switch unit connects the negative electrode of the first battery 100a and the second node P2, and the second switch unit connects the negative electrode of the second battery 100b and the second node P2. The positive electrode of the first battery 100a can be directly connected to the first node P1, and the positive electrode of the second battery 100b can be directly connected to the first node P1. The closing or opening of the first switch unit and the second switch unit can be controlled to realize the connection or disconnection between the first battery 100a and the second battery 100b and the load 101, and further, the power supply of the first battery 100a and the second battery 100b to the load 101 can be controlled or the power supply of the first battery 100a and the second battery 100b to the load 101 can be switched.

[0181] The first node P1 can also be connected to the main relay K1. The first node P1 is connected to the positive electrode of the load 101 through the main relay K1, and the second node P2 can be directly connected to the negative electrode of the load 101. Among them, the first end of the main relay K1 is connected to the first node P1, the second end of the main relay K1 is connected to the positive electrode of the load 101, and when the main relay K1 is closed, the first node P1 is controlled to be connected to the positive electrode of the load 101. It can be understood that the main relay K1 is closed before starting to supply power to the load 101, and during the entire power supply process, including the period when the first battery 100a is switched to the second battery 100b, the main relay K1 always remains closed so that the first node P1 and the second node P2 maintain the connection with the load 101. A pre-charge control circuit is connected in parallel at both ends of the main relay K1. Before closing the main relay K1, the pre-charge control circuit is connected in series with the first battery 100a to form a pre-charge loop. The pre-charge control circuit can include a series-connected pre-charge relay K2 and a pre-charge resistor R.

[0182] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered by the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A power supply method, characterized in that, Including: Obtaining a first voltage of a first battery currently supplying power to a load and a second voltage of a second battery to be switched; According to the difference between the first voltage and the second voltage being greater than 0V, during the period of switching from the first battery to the second battery to supply power to the load, using an adjustable power supply to supply power to the load; wherein, In response to the voltage of the adjustable power supply being adjusted to a difference less than a first threshold from the first voltage, performing the switching from the first battery to the adjustable power supply to supply power to the load, In response to the voltage during the period when the adjustable power supply supplies power to the load being adjusted to a difference less than a second threshold from the second voltage, performing the switching from the adjustable power supply to the second battery to supply power to the load.

2. The method according to claim 1, wherein The performing the switching from the first battery to the adjustable power supply to supply power to the load in response to the voltage of the adjustable power supply being adjusted to a difference less than a first threshold from the first voltage includes: In response to the voltage of the adjustable power supply being adjusted to a difference less than a first threshold from the first voltage, controlling the adjustable power supply to supply power to the load; During the period when the adjustable power supply supplies power to the load, cutting off the power supply of the first battery to the load.

3. The method according to claim 1, wherein The performing the switching from the adjustable power supply to the second battery to supply power to the load in response to the voltage during the period when the adjustable power supply supplies power to the load being adjusted to a difference less than a second threshold from the second voltage includes: In response to the voltage during the period when the adjustable power supply supplies power to the load being adjusted to a difference less than a second threshold from the second voltage, controlling the second battery to supply power to the load; During the period when the second battery supplies power to the load, cutting off the power supply of the adjustable power supply to the load.

4. The method according to claim 1, wherein The method further includes: according to the first voltage being equal to the second voltage, during the period of switching from the first battery to the second battery to supply power to the load, controlling the adjustable power supply to supply power to the load based on a third voltage, the difference between the third voltage and the first voltage being less than the first threshold; wherein, During the period when the adjustable power supply supplies power to the load, cutting off the power supply of the first battery to the load and controlling the second battery to supply power to the load.

5. The method according to claim 1, wherein The method further includes: according to the first voltage being equal to the second voltage, performing the direct switching from the first battery to the second battery to supply power to the load, wherein, Before cutting off the power supply of the first battery to the load, controlling the second battery to supply power to the load.

6. The method according to any one of claims 1-5, characterized in that, The positive electrode of the first battery and the positive electrode of the second battery are connected to a first node, the negative electrode of the first battery and the negative electrode of the second battery are connected to a second node, the first node and the second node are respectively connected to the positive electrode and the negative electrode of the load; the first battery and the second battery are further connected to a switch module, and the switch module connects the first node and / or the second node; the method includes: Controlling, through the switch module, the disconnection between the first battery and the first node and / or the second node to cut off the power supply of the first battery to the load; Through the switch module, control the connection between the first battery and the first node and the second node to supply power from the first battery to the load; Through the switch module, control the disconnection between the second battery and the first node and / or the second node to cut off the power supply from the second battery to the load; Through the switch module, control the connection between the second battery and the first node and the second node to supply power from the second battery to the load.

7. The method according to claim 6, wherein The method further includes: Under a first working condition, through the switch module, supply power to the load from the first battery or the second battery; Under a second working condition, through the switch module, control the connection between the first battery and the first node and the second node, and the connection between the second battery and the first node and the second node, to supply power to the load jointly by the first battery and the second battery.

8. The method according to any one of claims 1-5, characterized in that, The adjustable power supply includes a bidirectional DC-DC converter and a power supply module. The first end of the bidirectional DC-DC converter is connected to the power supply module to adjust the voltage output by the power supply module, and the second end of the bidirectional DC-DC converter is connected to the load; The execution of switching from the first battery to the adjustable power supply to supply power to the load in response to the voltage of the adjustable power supply being adjusted to a difference less than a first threshold from the first voltage includes: In response to the bidirectional DC-DC converter adjusting the voltage output by the power supply module to a difference less than a first threshold from the first voltage, control the power supply module to supply power to the load via the DC-DC converter; The execution of switching from the adjustable power supply to the second battery to supply power to the load in response to the voltage during the adjustable power supply supplying power to the load being adjusted to a difference less than a second threshold from the second voltage includes: In response to the bidirectional DC-DC converter adjusting the voltage output by the power supply module to a difference less than a second threshold from the second voltage, control the bidirectional DC-DC converter to charge the power supply module.

9. A power supply circuit, characterized in that, Includes: Multiple batteries; An adjustable power supply; A control module configured to: Obtain the first voltage of the first battery that is currently supplying power to the load and the second voltage of the second battery to be switched among multiple batteries; According to the difference between the first voltage and the second voltage being greater than 0V, during the switching from the first battery to the second battery to supply power to the load, use the adjustable power supply to supply power to the load; wherein, The control module executes switching from the first battery to the adjustable power supply to supply power to the load in response to the voltage of the adjustable power supply being adjusted to a difference less than a first threshold from the first voltage, and executes switching from the adjustable power supply to the second battery to supply power to the load in response to the voltage during the adjustable power supply supplying power to the load being adjusted to a difference less than a second threshold from the second voltage.

10. The power supply circuit according to claim 9, wherein, The control module is further configured to: in response to the difference between the voltage of the adjustable power supply and the first voltage being less than a first threshold, control the adjustable power supply to supply power to the load, and during the period when the adjustable power supply supplies power to the load, cut off the power supply from the first battery to the load, so as to perform the switching from the first battery to the adjustable power supply to supply power to the load.

11. The power supply circuit according to claim 9, wherein The control module is further configured to: in response to the difference between the voltage during the period when the adjustable power supply supplies power to the load and the second voltage being less than a second threshold, control the second battery to supply power to the load, and during the period when the second battery supplies power to the load, cut off the power supply from the adjustable power supply to the load, so as to perform the switching from the adjustable power supply to the second battery to supply power to the load.

12. The power supply circuit according to claim 9, wherein The control module is further configured to: According to the first voltage being equal to the second voltage, during the switching from the first battery to the second battery to supply power to the load, control the adjustable power supply to supply power to the load based on a third voltage, the difference between the third voltage and the first voltage being less than the first threshold; wherein, The control module is configured to cut off the power supply from the first battery to the load during the period when the adjustable power supply supplies power to the load, and control the second battery to supply power to the load.

13. The power supply circuit according to claim 9, wherein The control module is further configured to: according to the first voltage being equal to the second voltage, perform the direct switching from the first battery to the second battery to supply power to the load, wherein, The control module is configured to control the second battery to supply power to the load before cutting off the power supply from the first battery to the load.

14. The power supply circuit according to any one of claims 9-13, characterized in that, Among multiple batteries, the positive electrode of each battery is connected to a first node, and the negative electrode of each battery is connected to a second node. The first node and the second node are respectively used for connecting to the positive electrode and the negative electrode of the load; the power supply circuit further includes: A switch module, connected to the battery, and the switch module is further connected to the first node and / or the second node. The control module is configured to: Control the connection and disconnection between the battery and the first node and / or the second node through the switch module.

15. The power supply circuit according to claim 14, characterized in that, The switch module includes: Multiple switch units, the multiple switch units are respectively connected to the multiple batteries in one-to-one correspondence. Among them, the switch unit is connected to the positive electrode of the battery and the first node, or connected to the negative electrode of the battery and the second node.

16. The power supply circuit according to claim 14, wherein The control module is further configured to: Under a first working condition, perform the switching from the first battery to the second battery to supply power to the load through the switch module; Under a second working condition, control at least two of the multiple batteries to be connected to the first node and the second node through the switch module, so as to perform at least two batteries to jointly supply power to the load.

17. The power supply circuit according to any one of claims 9-13, characterized in that, The adjustable power supply includes a bidirectional DC-DC converter and a power supply module. The first end of the bidirectional DC-DC converter is connected to the power supply module to adjust the voltage output by the power supply module. The second end of the bidirectional DC-DC converter is connected to the load. The control module is configured to: In response to the bidirectional DC-DC converter adjusting the voltage output by the power supply module to a difference less than a first threshold from the first voltage, control the power supply module to supply power to the load via the DC-DC converter; And, In response to the bidirectional DC-DC converter adjusting the voltage output by the power supply module to a difference less than a second threshold from the second voltage, control the bidirectional DC-DC converter to charge the power supply module.

18. A battery system, characterized in that, Comprising the power supply circuit according to any one of claims 9-14.

19. An electrical device, characterized in that, Comprising the battery system according to claim 18, and the battery system supplies power to the electrical device.

20. An energy storage device, characterized in that, The energy storage device includes the battery system according to claim 18, and the battery system is used for storing electrical energy.

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