Charging control method, control equipment and vehicle

Abstract

The invention discloses a charging control method and device for a double-battery system and a vehicle. The control method comprises the steps that charging information of a charging power source is obtained; when the charging information of the charging power supply meets a first charging condition, the charging power supply charges a first battery, and the first battery boosts and charges a second battery through a bidirectional DC-DC converter; and when the charging information of the charging power supply meets a second charging condition, the charging power supply charges the second battery, and the second battery carries out voltage reduction charging on the first battery through the bidirectional DC-DC converter. Through cooperation and mutual redundancy of the first battery and the second battery, the endurance mileage and the power performance of the vehicle are improved at the same time, the reliability of the vehicle is further improved, the risk that the vehicle breaks down is reduced, the vehicle can be suitable for direct-current charging piles of different voltage platforms, and the compatibility of vehicle charging is improved.

Description

Technical Field

[0001] The present invention relates to the field of charging technology, and in particular to a charging control method, a control device, and a vehicle. Background Art

[0002] With the development of electric vehicles, people's requirements for electric vehicles are becoming increasingly higher. In addition to requiring long driving range, they also require strong driving performance to meet the motor's rapid acceleration and high torque acceleration specifications. This places high demands on electric vehicle power batteries: On the one hand, to meet the driving range requirements, the power battery needs to have a high energy density, capable of providing the most energy for the entire vehicle under the same volume; on the other hand, to meet the motor's rapid acceleration and high torque specifications, the power battery needs to have a high power density, capable of providing strong power output in an instant, that is, being able to release a large amount of current instantly.

[0003] In order to provide instantaneous high energy output, power batteries often have lower compaction density and surface density to ensure the rapid movement of lithium ions, thereby instantly releasing huge amounts of energy. However, at the same time, under the same volume, this also means that the overall energy of the power battery will be reduced. Energy batteries often have higher compaction density and surface density in order to store more energy under the same volume, but at the same time, this also means greater internal resistance, and the rapid movement of lithium ions is limited, which means that their ability to instantly release large currents is limited. This means that under the same volume and cost, current electric vehicles will sacrifice some power performance if they choose a longer driving range; and they will sacrifice some driving range if they choose higher power performance. Summary of the Invention

[0004] The Summary of the Invention introduces a series of simplified concepts that will be further described in the Detailed Description of the Invention. The Summary of the Invention is not intended to limit the key features and essential features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0005] The present invention provides a charging control method for a dual-battery system, comprising:

[0006] Get charging information of the charging power source;

[0007] When the charging information of the charging power source meets the first charging condition, the charging power source charges the first battery, and the first battery boosts and charges the second battery through the bidirectional DC-DC converter;

[0008] When the charging information of the charging power source meets the second charging condition, the charging power source charges the second battery, and the second battery charges the first battery by reducing the voltage thereof through the bidirectional DC-DC converter.

[0009] Exemplarily, the charging information of the charging power source meeting the first charging condition includes:

[0010] The voltage of the charging power supply is lower than or equal to a threshold voltage; or,

[0011] The voltage of the charging power source is higher than a threshold voltage, and the remaining power of the second battery is greater than or equal to a threshold remaining power.

[0012] Exemplarily, the charging information of the charging power source meeting the second charging condition includes: the voltage of the charging power source is higher than a threshold voltage, and the remaining power of the second battery is less than a threshold remaining power.

[0013] Exemplarily, the first battery comprises an energy battery, and the second battery comprises a power battery.

[0014] Exemplarily, when the charging information of the charging power source meets the first charging condition, the charging power source charges the first battery, and the first battery boosts and charges the second battery through the bidirectional DC-DC converter, including:

[0015] When the charging information of the charging power source meets a first charging condition, closing a first main switch group and a first switch group between the charging power source and the first battery, so that the charging power source charges the first battery, wherein the first battery is also connected to the bidirectional DC-DC converter via the first switch group;

[0016] closing a second switch group between the second battery and the bidirectional DC-DC converter, so that the first battery boosts and charges the second battery through the bidirectional DC-DC converter;

[0017] When the second battery is fully charged, disconnecting the second switch group between the second battery and the bidirectional DC-DC converter;

[0018] The first battery continues to be charged after the second battery is fully charged. When the first battery is fully charged, the first main switch group and the first switch group between the charging power source and the first battery are disconnected.

[0019] Exemplarily, when the charging information of the charging power source meets the second charging condition, the charging power source charges the second battery, and the second battery charges the first battery by reducing the voltage through the bidirectional DC-DC converter, including:

[0020] When the charging information of the charging power source meets a second charging condition, closing a second main switch group and a second switch group between the charging power source and the second battery, so that the charging power source charges the second battery, wherein the second battery is also connected to the bidirectional DC-DC converter via the second switch group;

[0021] Closing a first switch group between the first battery and the bidirectional DC-DC converter, so that the second battery charges the first battery by reducing the voltage through the bidirectional DC-DC converter;

[0022] When the first battery is fully charged, disconnecting a first switch group between the first battery and the bidirectional DC-DC converter;

[0023] After the first battery is fully charged, the second battery continues to be charged. When the second battery is fully charged, the second main switch group and the second switch group between the charging power source and the second battery are disconnected.

[0024] The present invention also provides a control device, which includes: a memory, a processor, and a computer program stored in the memory and running on the processor. When the processor executes the computer program, it implements the charging control method of the dual battery system described in any one of the above.

[0025] The present invention also provides a vehicle, characterized in that the vehicle includes the control device as described above.

[0026] According to the charging control method, control device and vehicle of the dual-battery system provided by the present invention, a first battery and a second battery are provided. When the charging power supply is sufficient to charge the first battery, the charging power supply directly charges the first battery, and the first battery boosts and charges the second battery through a bidirectional DC-DC converter. When the charging power supply is sufficient to charge the second battery, the charging power supply directly charges the second battery, and the second battery steps down and charges the first battery through a bidirectional DC-DC converter. The first battery and the second battery work together and serve as redundancy to each other, thereby improving the vehicle's cruising range and power performance, further improving the vehicle's reliability, reducing the risk of the vehicle breaking down, and making the vehicle suitable for DC charging piles of different voltage platforms, thereby improving the compatibility of vehicle charging. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The following drawings of the present invention are incorporated herein as part of the present invention for understanding the present invention. The drawings show embodiments of the present invention and the description thereof is used to explain the principle of the present invention.

[0028] In the attached figure:

[0029] Figure 1is a flow chart of a charging control method for a dual battery system according to an embodiment of the present invention;

[0030] Figure 2 2 is a schematic diagram of a circuit structure of a dual-battery system according to an embodiment of the present invention;

[0031] Figure 3 is a working flow diagram of a dual battery system according to an embodiment of the present invention;

[0032] Figure 4 is a schematic block diagram of a control device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0033] In the following description, numerous specific details are provided to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention may be practiced without one or more of these details. In other instances, certain technical features well known in the art are not described to avoid confusion with the present invention.

[0034] It should be understood that the present invention can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to make the disclosure thorough and complete and to fully convey the scope of the invention to those skilled in the art. In the drawings, the dimensions and relative sizes of layers and regions may be exaggerated for clarity. Like reference numerals throughout represent like elements.

[0035] The purpose of the terms used herein is only to describe specific embodiments and is not intended to limit the present invention. When used herein, the singular forms "a", "an", and "the" are intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "comprising" and / or "comprising", when used in this specification, determine the presence of the features, integers, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, parts and / or groups. When used herein, the term "and / or" includes any and all combinations of the relevant listed items.

[0036] In order to fully understand the present invention, detailed steps and detailed structures will be presented in the following description to illustrate the technical solutions proposed by the present invention. Preferred embodiments of the present invention are described in detail below, but in addition to these detailed descriptions, the present invention may also have other implementations.

[0037] The present invention provides a charging control method for a dual battery system. Figure 1 As shown, including:

[0038] Step S110: obtaining charging information of the charging power source;

[0039] Step S120: When the charging information of the charging power source meets the first charging condition, the charging power source charges the first battery, and the first battery boosts and charges the second battery through the bidirectional DC-DC converter;

[0040] Step S130: When the charging information of the charging power source meets the second charging condition, the charging power source charges the second battery, and the second battery charges the first battery by reducing the voltage thereof through the bidirectional DC-DC converter.

[0041] First, step S110 is executed to obtain charging information of the charging power source.

[0042] Exemplarily, the charging power source includes a DC charging pile. The dual battery system includes an energy type battery and a power type battery.

[0043] Currently, DC charging includes low-voltage platforms (platforms below DC500V) and high-voltage platforms (platforms above DC500V). The low-voltage platform is compatible with most DC charging piles on the market for DC charging. To be compatible with DC500V DC piles, the high-voltage platform usually requires the addition of a boost charging module. On the one hand, when the DC charging pile is at low voltage, the boost charging module is used for boost charging. On the other hand, when the DC charging pile is at high voltage, the boost charging module is fully open for charging or closed for charging with a direct-connected charging contactor.

[0044] When a vehicle detects that a DC charging gun has been inserted and DC charging is initiated, it first determines the DC charging station's allowable output voltage level. If the DC charging station is a low-voltage platform, only the energy-type battery can be charged. This is because energy-type batteries have low voltages and power-type batteries have high voltages, and low-voltage DC charging stations cannot directly charge power-type batteries. The dual-battery system is compatible with DC charging stations of different voltage platforms on the market, offering excellent compatibility and enabling multiple DC charging methods. Intelligently selecting the DC charging method fully utilizes the capabilities of the vehicle and charging station, achieving the optimal DC charging method and maximum charging power.

[0045] In one embodiment, obtaining charging information of the charging power source includes obtaining the voltage of the DC charging pile and then comparing the voltage with a threshold voltage (e.g., 500 V). It should be noted that the threshold voltage can be set as needed and is not limited in this application.

[0046] Next, step S120 is executed. When the charging information of the charging power source meets the first charging condition, the charging power source charges the first battery, and the first battery boosts and charges the second battery through the bidirectional DC-DC converter.

[0047] Exemplarily, the charging information of the charging power source meeting the first charging condition includes that the voltage of the charging power source is lower than or equal to a threshold voltage.

[0048] Exemplarily, the charging information of the charging power source meeting the first charging condition includes that the voltage of the charging power source is higher than a threshold voltage, and the remaining power of the second battery is greater than or equal to a threshold remaining power.

[0049] Exemplarily, when the charging information of the charging power supply meets a first charging condition, the charging power supply charges the first battery, and the first battery boosts and charges the second battery through the bidirectional DC-DC converter, including: when the charging information of the charging power supply meets the first charging condition, closing the first main switch group and the first switch group between the charging power supply and the first battery, and the charging power supply charges the first battery, wherein the first battery is also connected to the bidirectional DC-DC converter via the first switch group; closing the second switch group between the second battery and the bidirectional DC-DC converter, and the first battery boosts and charges the second battery through the bidirectional DC-DC converter; when the second battery is fully charged, disconnecting the second switch group between the second battery and the bidirectional DC-DC converter; continuing to charge the first battery after the second battery is fully charged, and when the first battery is fully charged, disconnecting the first main switch group and the first switch group between the charging power supply and the first battery.

[0050] In one embodiment, referring to Figure 2 and Figure 3As shown, the charging gun is inserted into the DC charging port to start DC charging. When the voltage of the DC charging pile is lower than or equal to the threshold voltage (for example, 500V), or when the voltage of the DC charging pile is higher than the threshold voltage (for example, 500V) and the remaining capacity (SOC) of the power type battery is greater than or equal to the threshold remaining capacity, the first charging condition is met. When the first charging condition is met, the Kb-, Kb+, K5b, and K6 contactors are first energized, wherein the K5b and K6 contactors are the first main switch groups between the DC charging port and the first battery, and the Kb- and Kb+ contactors are the first switch groups between the DC charging port and the first battery. When the first main switch group K5b and K6 are closed and the first switch group Kb- and Kb+ are closed, the first battery is also connected to the bidirectional DC-DC converter. The first battery is an energy type battery, also referred to as an energy pack in this application. When the Kb-, Kb+, K5b, and K6 contactors are energized, the DC charging pile directly charges the energy type battery. Next, the Ka- and Ka+ contactors are energized. The Ka- and Ka+ contactors are the second switch group between the bidirectional DC-DC converter and the second battery. The second battery is a power battery, also referred to as a power pack in this application. When the Ka- and Ka+ contactors are energized, the energy battery charges the power battery through the bidirectional DC-DC converter. During charging, the power battery is first fully charged. When the power battery is fully charged, the Ka- and Ka+ contactors are disconnected, the bidirectional DC-DC converter stops working, and the DC charging pile continues to charge the energy battery. When the energy battery is also fully charged, the Kb-, Kb+, K5b, and K6 contactors are disconnected, and the charging gun is pulled out to end DC charging. This charging method is compatible with low-voltage DC charging piles for DC charging of the entire vehicle, and can charge energy batteries and power batteries at the same time, thereby increasing the charging power of the entire vehicle.

[0051] In the embodiment of the present application, since the capacity of the power battery itself is relatively small, when the remaining power of the power battery is high, the DC charging pile may charge the power battery quickly directly, and it cannot fully exert its high-rate charging performance. Therefore, when the remaining power of the power battery is high, an energy battery is used to charge the power battery through a bidirectional DC-DC converter, and the control strategy is relatively simple.

[0052] In the embodiment of the present application, since the energy type battery is directly connected to the DC charging pile, if the energy type battery is fully charged first, then the DC charging pile will be difficult to control when charging the power type battery, and may cause the energy type battery to be overcharged. Therefore, it is more appropriate to adopt a control method of fully charging the power type battery first and then fully charging the energy type battery.

[0053] Next, step S130 is executed. When the charging information of the charging power source meets the second charging condition, the charging power source charges the second battery, and the second battery charges the first battery by reducing the voltage thereof through the bidirectional DC-DC converter.

[0054] Exemplarily, the charging information of the charging power source meeting the second charging condition includes that the voltage of the charging power source is higher than a threshold voltage, and the remaining power of the second battery is less than a threshold remaining power.

[0055] Exemplarily, when the charging information of the charging power source meets a second charging condition, the charging power source charges the second battery, and the second battery reduces the voltage of the first battery by charging the first battery through the bidirectional DC-DC converter. The method includes: when the charging information of the charging power source meets the second charging condition, closing the second main switch group and the second switch group between the charging power source and the second battery, and the charging power source charges the second battery, wherein the second battery is also connected to the bidirectional DC-DC converter via the second switch group; closing the first switch group between the first battery and the bidirectional DC-DC converter, and the second battery reduces the voltage of the first battery by charging the first battery through the bidirectional DC-DC converter; when the first battery is fully charged, disconnecting the first switch group between the first battery and the bidirectional DC-DC converter; and continuing to charge the second battery after the first battery is fully charged. When the second battery is fully charged, disconnecting the second main switch group and the second switch group between the charging power source and the second battery.

[0056] In one embodiment, referring to Figure 2 and Figure 3As shown, the charging gun is inserted into the DC charging port to start DC charging. When the voltage of the DC charging pile is higher than the threshold voltage (for example, 500V) and the remaining capacity (SOC) of the power battery is less than the threshold remaining capacity, the second charging condition is met. When the second charging condition is met, the Ka-, Ka+, K5a, and K6 contactors are first energized, wherein the K5a and K6 contactors are the second main switch groups between the DC charging port and the second battery, and the Ka- and Ka+ contactors are the second switch groups between the DC charging port and the second battery. When the second main switch groups K5a and K6 are closed and the second switch groups Ka- and Ka+ are closed, the second battery is also connected to the bidirectional DC-DC converter. The second battery is a power battery, also referred to as a power pack in this application. When the Ka-, Ka+, K5a, and K6 contactors are energized, the DC charging pile directly charges the power battery. Next, the Kb- and Kb+ contactors are energized. The Kb- and Kb+ contactors are the first switch group between the bidirectional DC-DC converter and the first battery. The first battery is an energy-type battery, also referred to as an energy pack in this application. When the Kb- and Kb+ contactors are energized, the power-type battery charges the energy-type battery by stepping down the voltage through the bidirectional DC-DC converter. During charging, the energy-type battery is first fully charged. When the energy-type battery is fully charged, the Kb- and Kb+ contactors are disconnected, the bidirectional DC-DC converter stops working, and the DC charging pile continues to charge the power-type battery. When the power-type battery is also fully charged, the Ka-, Ka+, K5a, and K6 contactors are disconnected, and the charging gun is pulled out to end the DC charging.

[0057] In the embodiments of the present application, since the charging rate of the power battery is significantly greater than that of the energy battery, the use of a DC charging pile directly connected to the power battery can fully utilize the charging capacity of the high-voltage DC charging pile and further improve the charging efficiency of the entire vehicle.

[0058] In the embodiment of the present application, since the power type battery is directly connected to the DC charging pile, if the power type battery is fully charged first, then the DC charging pile will not be easy to control when charging the energy type battery, and may cause the power type battery to be overcharged. Therefore, it is more appropriate to adopt a control method of fully charging the energy type battery first and then fully charging the power type battery.

[0059] Optionally, it further comprises a first pre-filling circuit arranged in parallel with the first switch group, and / or a second pre-filling circuit arranged in parallel with the second switch group. Figure 2 As shown, the Kay contactor is connected in series with a resistor and then in parallel with the Ka+ contactor, forming a pre-charge circuit for the high-voltage circuit of the power battery. In addition, the Kby contactor is connected in series with a resistor and then in parallel with the Kb+ contactor, forming a pre-charge circuit for the high-voltage circuit of the energy battery.

[0060] In one embodiment, the charging system also includes a drive assembly and a high-voltage load arranged in parallel. Preferably, the power battery provides energy for the drive assembly, while the energy battery supplies power to low-power, high-voltage loads, including but not limited to DC-DC converters, onboard chargers (OBCs), and compressors. The energy battery and the power battery are connected via a bidirectional DC-DC converter, enabling energy flow and transfer between the two battery packs, making the two battery packs redundant.

[0061] By combining both power batteries and energy packs in a dual-battery system, the advantages of both power and energy batteries can be combined while mitigating their respective disadvantages. For example, power batteries can provide instantaneous high energy output, while energy batteries have a higher energy density and can store and provide a larger amount of power. Power batteries have a high voltage platform and a low charge capacity, reducing cost and weight while offering high-rate charge and discharge capabilities, thus meeting the vehicle's acceleration performance and charging power requirements. Energy batteries have a low voltage platform and a high charge capacity, continuously providing energy to the vehicle and improving range. They can also utilize stable, inexpensive low-voltage power devices, effectively reducing high-voltage load costs. Furthermore, the synergistic and redundant nature of the power and energy batteries improves vehicle reliability. If one battery pack fails, the other can still operate to maintain basic vehicle functionality, reducing the risk of vehicle breakdown and avoiding financial losses and personal injury.

[0062] Figure 4 FIG2 is a schematic block diagram of a control device 400 according to an embodiment of the present invention. The control device 400 includes a memory 410 and a processor 420 .

[0063] The memory 410 stores program codes for implementing corresponding steps in the charging control method 300 for a dual-battery system according to an embodiment of the present invention.

[0064] The processor 420 is configured to run the program code stored in the memory 410 to execute corresponding steps of the charging control method 300 for a dual-battery system according to an embodiment of the present invention.

[0065] Furthermore, according to an embodiment of the present invention, a computer-readable storage medium is provided, on which program instructions are stored. When the program instructions are executed by a computer or processor, the program instructions are used to execute the corresponding steps of the dual-battery system charging control method 300 according to an embodiment of the present invention. The computer-readable storage medium may include, for example, a tablet computer storage component, a personal computer hard disk, a read-only memory (ROM), an erasable programmable read-only memory (EPROM), a portable compact disk read-only memory (CD-ROM), a USB memory, or any combination of the above storage media. The computer-readable storage medium may be any combination of one or more computer-readable storage media, for example, one computer-readable storage medium may contain computer-readable program code for randomly generating a sequence of action instructions, while another computer-readable storage medium may contain computer-readable program code for controlling crystal growth.

[0066] In addition, the present invention further provides a vehicle, which is equipped with the aforementioned control device 400. The vehicle in the present invention includes a dual battery system, which includes at least an energy battery and a power battery.

[0067] According to the charging control method, control device and vehicle of the dual-battery system provided by the present invention, a first battery and a second battery are provided. When the charging power supply is sufficient to charge the first battery, the charging power supply directly charges the first battery, and the first battery boosts and charges the second battery through a bidirectional DC-DC converter. When the charging power supply is sufficient to charge the second battery, the charging power supply directly charges the second battery, and the second battery steps down and charges the first battery through a bidirectional DC-DC converter. The first battery and the second battery work together and serve as redundancy to each other, thereby improving the vehicle's cruising range and power performance, further improving the vehicle's reliability, reducing the risk of the vehicle breaking down, and making the vehicle suitable for DC charging piles of different voltage platforms, thereby improving the compatibility of vehicle charging.

[0068] Although example embodiments have been described herein with reference to the accompanying drawings, it should be understood that the above example embodiments are merely illustrative and are not intended to limit the scope of the present application. Various changes and modifications may be made therein by those skilled in the art without departing from the scope and spirit of the present application. All such changes and modifications are intended to be included within the scope of the present application as required by the appended claims.

[0069] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0070] In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units described is merely a logical function division. In actual implementation, other division methods may be used, such as combining or integrating multiple units or components into another device, or ignoring or not performing some features.

[0071] In the description provided herein, a large number of specific details are described. However, it is understood that the embodiments of the present application can be practiced without these specific details. In some instances, well-known methods, structures, and techniques are not shown in detail so as not to obscure the understanding of this description.

[0072] Similarly, it should be understood that in order to streamline the present application and aid in understanding one or more of the various inventive aspects, in the description of the exemplary embodiments of the present application, the various features of the present application are sometimes grouped together into a single embodiment, figure, or description thereof. However, this approach of the present application should not be interpreted as reflecting the intention that the application claimed for protection requires more features than those explicitly recited in each claim. More precisely, as reflected in the corresponding claims, the inventive point is that the corresponding technical problem can be solved with fewer features than all the features of a single disclosed embodiment. Therefore, the claims following the detailed description are hereby expressly incorporated into the detailed description, with each claim itself serving as a separate embodiment of the present application.

[0073] It will be understood by those skilled in the art that, except where mutually exclusive, all features disclosed in this specification (including the accompanying claims, abstract, and drawings) and all processes or units of any method or apparatus disclosed herein may be combined in any combination. Unless expressly stated otherwise, each feature disclosed in this specification (including the accompanying claims, abstract, and drawings) may be replaced by an alternative feature providing the same, equivalent, or similar purpose.

[0074] Furthermore, those skilled in the art will appreciate that although some embodiments described herein include certain features included in other embodiments but not other features, combinations of features from different embodiments are intended to be within the scope of this application and to form different embodiments. For example, in the claims, any of the claimed embodiments may be used in any combination.

[0075] The various component embodiments of the present application can be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. It should be understood by those skilled in the art that a microprocessor or digital signal processor (DSP) can be used in practice to implement some or all of the functions of some modules in the article analysis device according to the embodiment of the present application. The application can also be implemented as a device program (e.g., computer program and computer program product) for executing a part or all of the methods described herein. Such a program implementing the present application can be stored on a computer-readable medium, or can have the form of one or more signals. Such a signal can be downloaded from an Internet website, or provided on a carrier signal, or provided in any other form.

[0076] It should be noted that the above embodiments illustrate rather than limit the present application, and that a person skilled in the art may devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference symbols placed between brackets should not be construed as limiting the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The present application may be implemented by means of hardware comprising several different elements and by means of appropriately programmed computers. In a unit claim enumerating several means, several of these means may be embodied by the same item of hardware. The use of the words first, second, and third etc. does not indicate any order. These words may be interpreted as names.

[0077] The above description is merely a specific embodiment or illustration of a specific embodiment of the present application, and the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present application should be included in the scope of protection of the present application. The scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A charging control method for a dual battery system, characterized in that: include: Get charging information of the charging power source; When the charging information of the charging power source meets the first charging condition, the charging power source charges the first battery, and the first battery boosts and charges the second battery through the bidirectional DC-DC converter; When the charging information of the charging power source meets the second charging condition, the charging power source charges the second battery, and the second battery charges the first battery by reducing the voltage thereof through the bidirectional DC-DC converter.

2. The control method according to claim 1, wherein: The charging information of the charging power supply meeting the first charging condition includes: The voltage of the charging power supply is lower than or equal to a threshold voltage; or, The voltage of the charging power source is higher than a threshold voltage, and the remaining power of the second battery is greater than or equal to a threshold remaining power.

3. The control method according to claim 1, wherein: The charging information of the charging power supply meeting the second charging condition includes: The voltage of the charging power source is higher than a threshold voltage, and the remaining power of the second battery is less than a threshold remaining power.

4. The control method according to claim 1, wherein: The first battery comprises an energy battery, and the second battery comprises a power battery.

5. The control method according to claim 1, wherein: When the charging information of the charging power source meets the first charging condition, the charging power source charges the first battery, and the first battery boosts and charges the second battery through the bidirectional DC-DC converter, including: When the charging information of the charging power source meets a first charging condition, closing a first main switch group and a first switch group between the charging power source and the first battery, so that the charging power source charges the first battery, wherein the first battery is also connected to the bidirectional DC-DC converter via the first switch group; closing a second switch group between the second battery and the bidirectional DC-DC converter, so that the first battery boosts and charges the second battery through the bidirectional DC-DC converter; When the second battery is fully charged, disconnecting the second switch group between the second battery and the bidirectional DC-DC converter; The first battery continues to be charged after the second battery is fully charged. When the first battery is fully charged, the first main switch group and the first switch group between the charging power source and the first battery are disconnected.

6. The control method according to claim 1, wherein: When the charging information of the charging power source meets the second charging condition, the charging power source charges the second battery, and the second battery charges the first battery by reducing the voltage through the bidirectional DC-DC converter, including: When the charging information of the charging power source meets a second charging condition, closing a second main switch group and a second switch group between the charging power source and the second battery, so that the charging power source charges the second battery, wherein the second battery is also connected to the bidirectional DC-DC converter via the second switch group; Closing a first switch group between the first battery and the bidirectional DC-DC converter, so that the second battery charges the first battery by reducing the voltage through the bidirectional DC-DC converter; When the first battery is fully charged, disconnecting a first switch group between the first battery and the bidirectional DC-DC converter; After the first battery is fully charged, the second battery continues to be charged. When the second battery is fully charged, the second main switch group and the second switch group between the charging power source and the second battery are disconnected.

7. A control device, characterized in that: The control device includes: A memory, a processor, and a computer program stored in the memory and running on the processor, wherein when the processor executes the computer program, the charging control method for the dual battery system according to any one of claims 1 to 6 is implemented.

8. A vehicle, characterized in that: The vehicle includes the control device according to claim 7.

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