Battery charging system, charging apparatus, power supply system and method for electrical device

Abstract

The present application pertains to the technical field of batteries, and provides a battery charging system, a charging apparatus, and a power supply system and method for an electrical device. The battery charging system is applied to a battery comprising a first battery pack and a second battery pack connected in series, and the battery charging system comprises: a first charging port, configured to be connected to a positive electrode and a negative electrode of the first battery pack; a second charging port, configured to be connected to a positive electrode and a negative electrode of the second battery pack; a first switch module, configured to connect or disconnect the battery to or from the first charging port and the second charging port; and a first controller, configured to control the first switch module to connect the battery to the first charging port and / or the second charging port, so as to charge the first battery pack and / or the second battery pack via one of the first charging port or the second charging port, or to charge the first battery pack and / or the second battery pack simultaneously via the first charging port and the second charging port. The battery charging system of the present application can improve the diversity of charging modes for charging the battery.

Description

Battery charging system, charging device, power supply system and power supply method for electrical equipment

[0001] Cross-referencing

[0002] This application incorporates Chinese Patent Application No. 202510095819.9, filed on January 21, 2025, entitled “Battery charging system, charging device, power supply system and power supply method for electrical equipment”, which is incorporated herein by reference in its entirety. Technical Field

[0003] This application relates to the field of battery technology, and in particular to a battery charging system, charging device, power supply system and power supply method for electrical equipment. Background Technology

[0004] With the development of electronic technology, electrical devices are increasingly being carried on electrical equipment. Taking vehicles as an example, electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important part of the sustainable development of the automotive industry. The onboard equipment in electric vehicles is powered by batteries, which are then charged by the electrical devices they consume.

[0005] Different electrical devices, or even the same electrical device in different application scenarios, may have different power requirements, thus necessitating the use of different charging modes. Summary of the Invention

[0006] This application aims to at least solve one of the technical problems existing in the background art. Therefore, one object of this application is to provide a battery charging system, charging device, power supply system for electrical equipment, and power supply method to solve the aforementioned problems existing in the related art.

[0007] An embodiment of the first aspect of this application provides a battery charging system. The battery includes a first battery pack and a second battery pack connected in series. The battery charging system includes: a first charging port for connecting the positive and negative terminals of the first battery pack; a second charging port for connecting the positive and negative terminals of the second battery pack; a first switching module for connecting / disconnecting the battery from the first charging port and the second charging port; and a first controller configured to control the first switching module to connect the first charging port and / or the second charging port to the battery, so that the first battery pack and / or the second battery pack can be charged through one of the first charging port or the second charging port, or the first battery pack and / or the second battery pack can be charged simultaneously through the first charging port and the second charging port.

[0008] In the technical solution of this application embodiment, a first charging port and a second charging port are provided in the battery charging system. The first charging port is connected to the positive and negative terminals of the first battery pack, and the second charging port is connected to the positive and negative terminals of the second battery pack. This allows the first battery pack to be charged individually through the first charging port, or the second battery pack to be charged individually through the second charging port, or the first and second battery packs to be charged simultaneously through both ports. Since the first and second battery packs are connected in series, the battery capacity can be increased regardless of whether either the first or second battery pack is charged. This increases the diversity of charging modes, thereby meeting the user's charging needs.

[0009] In some embodiments, the negative terminal of the first battery pack is connected to the positive terminal of the second battery pack. The first switch module includes: a first switch, the first end of which is connected to the negative terminal of the first charging port and the positive terminal of the second charging port, and the second end of which is connected to the connection point of the first battery pack and the second battery pack; a second switch, the first end of which is connected to the positive terminal of the first charging port, and the second end of which is connected to the positive terminal of the first battery pack; and a third switch, the first end of which is connected to the negative terminal of the second charging port, and the second end of which is connected to the negative terminal of the second battery pack. Thus, by closing / closing the first, second, and third switches, different charging modes for the battery can be achieved.

[0010] In some embodiments, the first switch module further includes: a fourth switch, the first end of which is connected to the negative terminal of the first charging port, and the second end of which is connected to the negative terminal of the second battery pack; and a fifth switch, the first end of which is connected to the positive terminal of the second charging port, and the second end of which is connected to the positive terminal of the first battery pack. The fourth switch enables the first charging port to charge the series-connected first and second battery packs, and the fifth switch enables the second charging port to charge the series-connected first and second battery packs. In other words, the fourth and fifth switches further enhance the diversity of charging modes for the batteries, meeting more charging needs.

[0011] In some embodiments, the battery charging system further includes: a first bridge arm, a first end of which is connected to the positive terminal of the battery, and a second end of which is connected to the negative terminal of the battery; a first energy storage circuit, a first end of which is connected to the midpoint of the first bridge arm, and a second end of which is connected to the connection point of the first battery pack and the second battery pack; a first controller is further configured to: alternately discharge from the first battery pack to the first energy storage circuit and from the first energy storage circuit to the second battery pack via the first bridge arm, and / or alternately discharge from the second battery pack to the first energy storage circuit and from the first energy storage circuit to the first battery pack via the first bridge arm. By setting the first bridge arm and the first energy storage circuit, energy transfer between the first battery pack and the second battery pack is realized, thereby enabling low-frequency heating of the battery and improving the charging efficiency of the battery.

[0012] In some embodiments, the battery charging system further includes a capacitor, with a first end connected to the positive terminal of the battery and a second end connected to the negative terminal of the battery. By providing the capacitor, during the discharge of the first battery pack to the first energy storage circuit and the discharge of the first energy storage circuit to the first battery pack, the second battery pack can form a circuit with the capacitor, and / or during the discharge of the first energy storage circuit to the second battery pack and the discharge of the second battery pack to the first energy storage circuit, the first battery pack can form a circuit with the capacitor, ensuring that current always flows through the first and second battery packs. This helps maintain the stability of the current flowing through the first and second battery packs, resulting in more stable performance of the first and second battery packs.

[0013] An embodiment of the second aspect of this application provides a charging device for connecting to a battery via the battery charging system described in the above embodiment to charge the battery. The battery includes a first battery pack and a second battery pack connected in series. The charging device further includes a heating module for connecting to the positive and negative terminals of the battery and the connection point of the first and second battery packs via a first charging port and a second charging port. The charging device is used to: charge at least one of the first or second battery packs via the first charging port and / or the second charging port in response to the battery temperature being greater than or equal to a first threshold; and discharge from the first battery pack to the second battery pack and / or from the second battery pack to the first battery pack via the heating module in response to the battery temperature being less than the first threshold. In other words, by providing a heating module in the charging device, which can be connected to the first and second battery packs respectively, energy transfer between the first and second battery packs can be achieved. This enables the battery to self-heat at low temperatures during charging, rapidly increasing the battery temperature and facilitating the use of a high-rate charging current to charge the battery, thereby increasing the charging rate. Furthermore, since the heating module is located within the charging device, there is no need to install a device for heating the battery in the electrical equipment, thereby reducing the cost of the electrical equipment.

[0014] In some embodiments, the charging device includes: a first output port for connecting to a first charging port; a second output port for connecting to a second charging port; the heating module includes: a second bridge arm, the two ends of which are respectively connected to the first output port and the second output port, so as to be connected to the positive and negative terminals of the battery through the first charging port and the second charging port; a second energy storage circuit, the first end of which is connected to the midpoint of the second bridge arm, and the second end of which is connected to the first output port or the second output port, so as to be connected to the connection point of the first battery pack and the second battery pack through the first charging port or the second charging port. The charging device is used to: alternately perform the discharge of the first battery pack to the second energy storage circuit and the discharge of the second energy storage circuit to the second battery pack through the second bridge arm, so as to discharge the first battery pack to the second battery pack, and / or alternately perform the discharge of the second battery pack to the second energy storage circuit and the discharge of the second energy storage circuit to the first battery pack through the second bridge arm, so as to discharge the second battery pack to the first battery pack. In this way, energy transfer between the first battery pack and the second battery pack can be realized through the second bridge arm and the second energy storage circuit, so that the heating current frequency is low during battery heating, thereby achieving low-frequency heating of the battery. Furthermore, the two ends of the second bridge arm are connected to the positive and negative terminals of the battery through the first charging port and the second charging port, respectively, forming a symmetrical structure. This allows energy transfer between the first and second battery packs to be realized regardless of whether the second end of the second energy storage circuit is connected to the connection point of the first and second battery packs through the first charging port or the second charging port, thus improving the flexibility of the circuit.

[0015] In some embodiments, the positive terminal of the first charging port is connected to the positive terminal of the battery, the negative terminal of the second charging port is connected to the negative terminal of the battery, the connection point of the first battery pack and the second battery pack is connected to the negative terminal of the first charging port and the positive terminal of the second charging port, the first end of the second bridge arm is used to connect to the positive terminal of the first charging port through the first output port, and the second end is used to connect to the negative terminal of the second charging port through the second output port; the second end of the second energy storage circuit is used to connect to the negative terminal of the first charging port or the positive terminal of the second charging port through the first output port or the second output port. This allows both ends of the second bridge arm and the second end of the second energy storage circuit to be connected to the battery through the first and second charging ports, enabling the second bridge arm and the second energy storage circuit to respectively form a discharge circuit from the first battery pack to the second battery pack and a discharge circuit from the second battery pack to the first battery pack, thereby realizing energy transfer between the first and second battery packs.

[0016] In some embodiments, the heating module further includes a third bridge arm, with its two ends connected to a first output port and a second output port, respectively. The first end of the third bridge arm is used to connect to the negative terminal of the first charging port via the first output port, and the second end is used to connect to the positive terminal of the second charging port via the second output port. The second end of the second energy storage circuit is connected to the midpoint of the third bridge arm. The charging device is further configured to control the second end of the second energy storage circuit to connect either to the negative terminal of the first charging port or to the positive terminal of the second charging port via the third bridge arm. The third bridge arm allows the second end of the second energy storage circuit to be selectively connected to either the connection point of the first and second battery packs via the negative terminal of the first charging port or via the positive terminal of the second charging port, thus improving the practicality of the charging device.

[0017] In some embodiments, the heating module further includes a sixth switch, the first end of which is connected to the second end of the second energy storage circuit, and the second end of which is connected to either the first output port or the second output port, such that the second end of the second energy storage circuit is connected to the negative terminal of the first charging port or the positive terminal of the second charging port. The sixth switch controls the connection between the second energy storage circuit and the first or second charging port, thereby disconnecting the second energy storage circuit from the first / second charging port when the charging device is charging the battery, improving charging safety.

[0018] In some embodiments, the charging device further includes: a power module connected to a first output port and a second output port to charge at least one of a first battery pack or a second battery pack through the first charging port and the second charging port; a second switch module connected between the power module and the first output port and the second output port to enable connection / disconnection between the power module and the first output port and the second output port; two ends of a second bridge arm connected to the second switch module to be connected to the first output port and the second output port respectively through the second switch module; and a second end of a second energy storage circuit connected to the second switch module to be connected to either the first output port or the second output port through the second switch module. This allows the charging device to connect the power module, the second bridge arm, and the second energy storage circuit to the first charging port and the second charging port through the second switch module, the first output port, and the second output port, enabling the charging device to simultaneously perform charging and heating functions, thus simplifying the circuit structure of the charging device.

[0019] In some embodiments, the charging device further includes: a seventh switch, wherein the first end of the second bridge arm is connected to the second switch module via the seventh switch; and an eighth switch, wherein the second end of the second bridge arm is connected to the second switch module via the eighth switch. By using the seventh and eighth switches, when the battery does not require heating, the seventh and eighth switches can be controlled to disconnect, thereby disconnecting the heating module from the first charging port and the second charging port, reducing safety hazards when the charging device charges the battery.

[0020] An embodiment of the third aspect of this application provides a power supply system for an electrical device, comprising: a battery; a battery charging system as described in the above embodiment; and a charging device as described in the above embodiment, the charging device being connected to the battery via the battery charging system to charge the battery, and a heating module of the charging device being connected to the positive terminal, negative terminal, and connection point of the first battery pack and the second battery pack via a first charging port and a second charging port; the charging device being configured to: charge at least one of the first battery pack or the second battery pack via the first charging port and / or the second charging port in response to a battery temperature greater than or equal to a first threshold; and discharge from the first battery pack to the second battery pack and / or discharge from the second battery pack to the first battery pack via the heating module in response to a battery temperature less than the first threshold.

[0021] An embodiment of the fourth aspect of this application provides a power supply method for an electrical device, applied to the power supply system of the electrical device described in the above embodiments, comprising: connecting the positive and negative terminals of a first battery pack to a first charging port, and connecting the positive and negative terminals of a second battery pack to a second charging port; acquiring the temperature of the battery; in response to the battery temperature being greater than or equal to a first threshold, controlling the first charging port and / or the second charging port to charge at least one of the first battery pack and the second battery pack; in response to the battery temperature being less than the first threshold, controlling a heating module to connect to the positive and negative terminals of the battery and the connection point of the first and second battery packs through the first and second charging ports, and through the heating module, performing discharge from the first battery pack to the second battery pack, and / or performing discharge from the second battery pack to the first battery pack. Thus, during the charging of the battery by the charging device, the battery achieves self-heating at a low temperature, rapidly increasing the battery temperature, facilitating the use of a high-rate charging current to charge the battery, and improving the battery charging rate.

[0022] In some embodiments, the heating module includes a second bridge arm and a second energy storage circuit. The two ends of the second bridge arm are respectively connected to the positive and negative terminals of the battery via a first charging port and a second charging port. The first end of the second energy storage circuit is connected to the midpoint of the second bridge arm, and the second end of the second energy storage circuit is connected to the connection point of the first battery pack and the second battery pack via the first charging port or the second charging port. Discharging from the first battery pack to the second battery pack includes: alternately discharging from the first battery pack to the second energy storage circuit and from the second energy storage circuit to the second battery pack via the second bridge arm; discharging from the second battery pack to the first battery pack includes: alternately discharging from the second battery pack to the second energy storage circuit and from the second energy storage circuit to the first battery pack via the second bridge arm. This allows energy transfer between the first and second battery packs to be achieved through the second bridge arm and the second energy storage circuit, resulting in a lower heating current frequency during battery heating and achieving low-frequency battery heating.

[0023] In some embodiments, the negative terminal of the first battery pack is connected to the positive terminal of the second battery pack; a first end of the second bridge arm is connected to the positive terminal of the first charging port, and a second end is connected to the negative terminal of the second charging port; a second end of the second energy storage circuit is connected to either the negative terminal of the first charging port or the positive terminal of the second charging port; the first switch module includes: a first switch, the first end of which is connected to the negative terminal of the first charging port and the positive terminal of the second charging port, and the second end of which is connected to the connection point of the first battery pack and the second battery pack; a second switch, the first end of which is connected to the positive terminal of the first charging port, and the second end of which is connected to the positive terminal of the first battery pack; and a third switch, the first end of which is connected to the negative terminal of the second charging port, and the second end of which is connected to the negative terminal of the second battery pack; controlling one of the first charging port or the second charging port to charge the first battery pack or the second battery pack. This includes: controlling the first and second switches to close and the third switch to open, so that the first charging port charges the first battery pack; or controlling the first and third switches to close and the second switch to open, so that the second charging port charges the second battery pack; or controlling the first, second, and third switches to close, so that the first and second charging ports simultaneously charge the first and second battery packs respectively; controlling the heating module to connect to the positive and negative terminals of the battery and the connection points of the first and second battery packs through the first and second charging ports, including: controlling the first, second, and third switches to close; controlling the first end of the second bridge arm to connect to the positive terminal of the first charging port and the second end to connect to the negative terminal of the second charging port; and controlling the second end of the second energy storage circuit to connect to the negative terminal of the first charging port or to the positive terminal of the second charging port. Through the setting of the first, second, and third switches, not only can different charging modes be switched, but they can also be used to connect the heating module to the battery, realizing self-heating during battery charging and improving charging efficiency.

[0024] In some embodiments, the second bridge arm includes a second upper bridge arm and a second lower bridge arm. The second upper bridge arm is used to connect to the positive terminal of the first charging port, and the second lower bridge arm is used to connect to the negative terminal of the second charging port. Through the second bridge arm and the second energy storage circuit, the discharge from the first battery pack to the second battery pack, and / or the discharge from the second battery pack to the first battery pack, includes: sequentially and alternately controlling the second upper bridge arm and the second lower bridge arm to conduct, so that the first battery pack discharges to the second battery pack, and / or sequentially and alternately controlling the second lower bridge arm and the second upper bridge arm to conduct, so that the second battery pack discharges to the first battery pack. This reduces the frequency of the current flowing through the first and second battery packs during the heating process, improving the heating efficiency of the batteries.

[0025] In some embodiments, the first switch module further includes: a fourth switch, the first end of which is connected to the negative terminal of the first charging port, and the second end of which is connected to the negative terminal of the second battery pack; a fifth switch, the first end of which is connected to the positive terminal of the second charging port, and the second end of which is connected to the positive terminal of the first battery pack; controlling the first charging port and / or the second charging port to charge at least one of the first battery pack and the second battery pack further includes performing any one of the following steps: controlling the second switch and the fourth switch to close, and the first switch, the third switch and the fifth switch to open, so that the first charging port charges the first battery pack and the second battery pack; controlling the third switch and the fifth switch to close, and the first switch, the second switch and the fourth ... first switch and the fifth switch to close, and the first switch, the second switch and the fourth switch to open, so that the first charging port charges the first battery pack and the second battery pack; controlling the third switch and the fifth switch to close, and the first switch, the second switch and the fourth switch to open, so that the first charging port charges the first battery pack and the second battery pack; The system can be configured to: 1) Open the first charging port to charge both the first and second battery packs; 2) Close the second, third, fourth, and fifth switches while opening the first switch, allowing both the first and second charging ports to charge both battery packs simultaneously; 3) Close the first, second, third, and fifth switches while opening the fourth switch, allowing both the first and second charging ports to charge both battery packs; 4) Close the first, second, third, and fourth switches while opening the fifth switch, allowing both the first and second charging ports to charge both battery packs simultaneously. This allows for greater diversity in charging modes, meeting a wider range of charging needs.

[0026] In some embodiments, the battery is further connected in parallel with a capacitor. The method further includes: during the discharge of the first battery pack to the second battery pack, simultaneously performing the discharge of the first battery pack to the second energy storage circuit and the discharge of the capacitor to the second battery pack through the second bridge arm; and simultaneously performing the discharge of the second energy storage circuit to the second battery pack and the discharge of the first battery pack to the capacitor through the second bridge arm; and / or during the discharge of the second battery pack to the first battery pack, simultaneously performing the discharge of the second battery pack to the second energy storage circuit and the discharge of the capacitor to the first battery pack through the second bridge arm; and simultaneously performing the discharge of the second energy storage circuit to the first battery pack and the discharge of the second battery pack to the capacitor through the second bridge arm. By setting the capacitor, during the discharge of the first battery pack to the second battery pack and the discharge of the second battery pack to the first battery pack through the second bridge arm and the second energy storage circuit, current is always flowing through the first battery pack and the second battery pack, which helps to maintain the stability of the current flowing through the first battery pack and the second battery pack, making the performance of the first battery pack and the second battery pack more stable.

[0027] In some embodiments, the battery is further connected to a first bridge arm, with the positive terminal of the battery connected to a first end of the first bridge arm, the negative terminal of the battery connected to a second end of the first bridge arm, the midpoint of the first bridge arm connected to a first end of a first energy storage circuit, and the second end of the first energy storage circuit connected to the connection point of the first battery pack and the second battery pack. The method further includes: alternately discharging the first battery pack to the first energy storage circuit and the first energy storage circuit to the second battery pack via the first bridge arm, and / or alternately discharging the second battery pack to the first energy storage circuit and the first energy storage circuit to the first battery pack via the first bridge arm. The first bridge arm and the first energy storage circuit are directly connected to the battery, so that even when the battery is not connected to a charging device, the battery can be heated through the first bridge arm and the first energy storage circuit to meet the battery's heating requirements.

[0028] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0029] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the various drawings denote the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings depict only some embodiments disclosed in this application and should not be construed as limiting the scope of this application.

[0030] Figure 1 is a schematic diagram of the vehicle structure according to some embodiments of this application;

[0031] Figure 2 is a functional block diagram of a battery charging system according to some embodiments of this application;

[0032] Figure 3 is a schematic diagram of the structure of a battery charging system according to some embodiments of this application;

[0033] Figure 4 is a second schematic diagram of the structure of a battery charging system according to some embodiments of this application;

[0034] Figure 5 is a third schematic diagram of the structure of a battery charging system according to some embodiments of this application;

[0035] Figure 6 is a fourth schematic diagram of the structure of a battery charging system according to some embodiments of this application;

[0036] Figure 7 is a fifth schematic diagram of the structure of a battery charging system according to some embodiments of this application;

[0037] Figure 8 is a schematic diagram of the structure of a battery charging system according to some embodiments of this application;

[0038] Figure 9 is a schematic diagram of the structure of a battery charging system according to some embodiments of this application;

[0039] Figure 10 is one of the structural schematic diagrams showing the connection between the charging device and the battery charging system in some embodiments of this application;

[0040] Figure 11 is one of the schematic diagrams of the current path when the heating module charges the battery in the charging device of some embodiments of this application;

[0041] Figure 12 is a second schematic diagram of the current path when the heating module charges the battery in the charging device of some embodiments of this application;

[0042] Figure 13 is a third schematic diagram of the current path when the heating module charges the battery in the charging device of some embodiments of this application;

[0043] Figure 14 is a fourth schematic diagram of the current path of the heating module charging the battery in a charging device according to some embodiments of this application.

[0044] Figure 15 is a current waveform diagram of the battery heating process in some embodiments of this application;

[0045] Figure 16 shows the current waveform during a battery heating process;

[0046] Figure 17 is a second schematic diagram of the connection between the charging device and the battery charging system according to some embodiments of this application;

[0047] Figure 18 is a third schematic diagram of the connection between the charging device and the battery charging system in some embodiments of this application;

[0048] Figure 19 is a fourth schematic diagram of the connection between the charging device and the battery charging system in some embodiments of this application;

[0049] Figure 20 is a fifth schematic diagram of the connection between the charging device and the battery charging system according to some embodiments of this application;

[0050] Figure 21 is a sixth schematic diagram of the connection between the charging device and the battery charging system according to some embodiments of this application;

[0051] Figure 22 is a seventh schematic diagram of the connection between the charging device and the battery charging system according to some embodiments of this application;

[0052] Figure 23 is a flowchart of one of the power supply methods for electrical equipment according to some embodiments of this application;

[0053] Figure 24 is a second flowchart of a power supply method for an electrical device according to some embodiments of this application;

[0054] Figure 25 is a flowchart of a power supply method for an electrical device according to some embodiments of this application;

[0055] Figure 26 is a flowchart of a power supply method for an electrical device according to some embodiments of this application;

[0056] Figure 27 is a flowchart of a power supply method for an electrical device according to some embodiments of this application;

[0057] Figure 28 is a flowchart of a power supply method for an electrical device according to some embodiments of this application;

[0058] Figure 29 is a flowchart of a power supply method for an electrical device according to some embodiments of this application;

[0059] Figure 30 is a flowchart of a power supply method for an electrical device according to some embodiments of this application;

[0060] Figure 31 is a flowchart of a power supply method for an electrical device according to some embodiments of this application. Detailed Implementation

[0061] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0062] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0063] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0064] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0065] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0066] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0067] With technological advancements, different electrical devices, or even the same device in different application scenarios, may have varying power requirements, necessitating different charging modes. For instance, high-power devices typically use larger-capacity batteries, requiring high-power charging current. Devices with smaller-capacity batteries may have lower voltage, thus requiring less power for charging. Alternatively, insufficient charging time necessitates shorter charging times, necessitating high-power charging. Furthermore, a mismatch between the charging power of the device and the power consumption of the device can prevent the charging device from charging the battery, resulting in incompatibility issues.

[0068] Based on the above considerations, to improve the diversity of charging modes for batteries, a battery charging system is designed. The system includes a first charging port 101 and a second charging port 102. The first charging port 101 is connected to the positive and negative terminals of a first battery pack 11, and the second charging port 102 is connected to the positive and negative terminals of a second battery pack 12. A first switch module is used to connect / disconnect the battery from the first and second charging ports, allowing the first battery pack 11 to be charged individually through the first charging port 101, the second battery pack 12 to be charged individually through the second charging port 102, or both the first and second charging ports 101 and 102 to charge simultaneously. Since the first and second battery packs 11 and 12 are connected in series, charging either the first or second battery pack increases the battery's capacity. This enhances the diversity of charging modes, thereby meeting users' charging needs.

[0069] The battery charging system disclosed in this application can be used, but is not limited to, for charging batteries in electrical equipment such as vehicles, ships, or aircraft.

[0070] Electrical devices can include, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0071] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.

[0072] Please refer to Figure 1, which is a schematic diagram of the vehicle structure provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle, etc. A battery 100 is disposed inside the vehicle 1000, and the battery 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery 100 can be used to power the vehicle 1000; for example, the battery 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may 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, to meet the power needs of the vehicle 1000 during startup, navigation, and driving.

[0073] In some embodiments of this application, the battery 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0074] As shown in Figure 2, this application embodiment provides a battery charging system. The battery includes a first battery pack 11 and a second battery pack 12 connected in series. The battery charging system includes: a first charging port 101 for connecting the positive and negative terminals of the first battery pack 11; a second charging port 102 for connecting the positive and negative terminals of the second battery pack 12; a first switch module 103 for connecting / disconnecting the battery with the first charging port 101 and the second charging port 102; and a first controller 104 configured to control the first switch module 103 to connect the battery with the first charging port 101 and / or the second charging port 102, so that the first battery pack 11 and / or the second battery pack 12 can be charged through one of the first charging port 101 or the second charging port 102, or the first battery pack 11 and / or the second battery pack 12 can be charged simultaneously through the first charging port 101 and the second charging port 102.

[0075] The positive terminal of the first battery pack 11 is connected to the positive terminal of the first charging port 101 via the first switch module 103, and the negative terminal of the first battery pack 11 is connected to the negative terminal of the first charging port 101 via the first switch module 103, so as to transfer electrical energy to the first battery pack 11 through the first charging port 101, thereby charging the first battery pack 11. The first switch module 103 can connect / disconnect the connection between the first charging port 101 and the first battery pack 11.

[0076] In this application, "connection" refers to connecting two or more electrical components by means of electrical connection in order to transmit electrical energy or signals. The connection can be a direct connection, that is, directly connecting two electrical components, or it can be an indirect connection, such as forming an electrical connection between two electrical components through other conductors.

[0077] The positive terminal of the second battery pack 12 is connected to the positive terminal of the second charging port 102 via the first switch module 103, and the negative terminal of the second battery pack 12 is connected to the negative terminal of the second charging port 102 via the first switch module 103, so as to transfer electrical energy to the second battery pack 12 through the second charging port 102, thereby charging the second battery pack 12. The first switch module 103 can connect / disconnect the connection between the second charging port 102 and the second battery pack 12.

[0078] In some embodiments, the negative terminal of the first battery pack 11 is connected to the positive terminal of the second battery pack 12, so that the first battery pack 11 and the second battery pack 12 are connected in series. Then, the connection point of the first battery pack 11 and the second battery pack 12 is connected to the negative terminal of the first charging port 101 and the positive terminal of the second charging port 102, respectively.

[0079] In some other embodiments, the positive terminal of the first battery pack 11 is connected to the negative terminal of the second battery pack 12, and the connection point of the first battery pack 11 and the second battery pack 12 is respectively connected to the positive terminal of the first charging port 101 and the negative terminal of the second charging port 102.

[0080] The above connection method enables the first battery pack 11 to be charged separately through the first charging port 101, the second battery pack 12 to be charged separately through the second charging port 102, and the first battery pack 11 and the second battery pack 12 to be charged simultaneously through the first charging port 101 and the second charging port 102.

[0081] It is understandable that, since the first battery pack 11 and the second battery pack 12 are connected in series, the battery capacity can be increased whether the first battery pack 11 or the second battery pack 12 is charged.

[0082] In some cases, during battery use, there may be a voltage imbalance between the first battery pack 11 and the second battery pack 12. In this case, the first battery pack 11 or the second battery pack 12 with the lower voltage can be charged separately through the first charging port 101 or the second charging port 102, so that the voltage of the first battery pack 11 and the second battery pack 12 can be balanced.

[0083] In some embodiments, a charging device 30 can be connected to a first charging port 101 and a second charging port 102 to charge the first battery pack 11 and the second battery pack 12 respectively through the first charging port 101 and the second charging port 102. Exemplarily, the charging device 30 may include, but is not limited to, a charging pile. The charging pile can be a dual-gun charging pile, i.e., it has two charging guns, which can be inserted into the first charging port 101 and the second charging port 102 respectively. The charging pile can also be a single-gun charging pile, i.e., it has one charging gun, and the charging guns of two single-gun charging piles can be inserted into the first charging port 101 and the second charging port 102 respectively, so that the first battery pack 11 and the second battery pack 12 can be charged simultaneously through the first charging port 101 and the second charging port 102.

[0084] In the above technical solution, the first charging port 101 and the second charging port 102 are connected to the first battery pack 11 and the second battery pack 12 respectively, which can improve the diversity of charging modes for charging the battery, thereby meeting the user's charging needs.

[0085] As shown in Figure 3, according to some embodiments of this application, the negative terminal of the first battery pack 11 is connected to the positive terminal of the second battery pack 12. The first switch module 103 includes: a first switch K1, the first end of which is connected to the negative terminal of the first charging port 101 and the positive terminal of the second charging port 102, and the second end of which is connected to the connection point of the first battery pack 11 and the second battery pack 12; a second switch K2, the first end of which is connected to the positive terminal of the first charging port 101, and the second end of which is connected to the positive terminal of the first battery pack 11; and a third switch K3, the first end of which is connected to the negative terminal of the second charging port 102, and the second end of which is connected to the negative terminal of the second battery pack 12.

[0086] The first switch K1 and the second switch K2 are closed, and the third switch K3 is opened, so that the first battery pack 11 can be charged separately through the first charging port 101.

[0087] The first switch K1 and the third switch K3 are closed, and the second switch K2 is opened, so that the second battery pack 12 can be charged separately through the second charging port 102.

[0088] The first switch K1, the second switch K2 and the third switch K3 are closed so that the first battery pack 11 and the second battery pack 12 can be charged simultaneously through the first charging port 101 and the second charging port 102.

[0089] In some embodiments, the first switch K1, the second switch K2, and the third switch K3 may be any of the switching elements that can control the on / off state of the circuit, including but not limited to a relay, a MOS transistor (Metal-Oxide-Semiconductor Field-Effect Transistor), etc.

[0090] In the above technical solution, different charging modes of the battery can be achieved by closing / closing the first switch K1, the second switch K2 and the third switch K3.

[0091] It is understood that in other embodiments, the connection points of the first battery pack 11 and the second battery pack 12 can also be connected to the negative terminal of the first charging port 101 and the positive terminal of the second charging port 102 respectively through two different switches.

[0092] As shown in Figure 4, according to some embodiments of this application, the first switch module 103 further includes: a fourth switch K4, the first end of which is connected to the negative terminal of the first charging port 101, and the second end of which is connected to the negative terminal of the second battery pack 12; and a fifth switch K5, the first end of which is connected to the positive terminal of the second charging port 102, and the second end of which is connected to the positive terminal of the first battery pack 11.

[0093] In other words, by closing the second switch K2 and the fourth switch K4, the positive terminal of the first battery pack 11 and the negative terminal of the second battery pack 12 can be connected to the positive and negative terminals of the first charging port 101, respectively, so that the first battery pack 11 and the second battery pack 12 connected in series can be charged through the first charging port 101.

[0094] By closing the third switch K3 and the fifth switch K5, the positive terminal of the first battery pack 11 and the negative terminal of the second battery pack 12 can be connected to the positive and negative terminals of the second charging port 102, respectively, so that the first battery pack 11 and the second battery pack 12 connected in series can be charged through the second charging port 102.

[0095] It is understandable that during the closing of the second switch K2 and the fourth switch K4, the first switch K1 can be closed so that the first charging port 101 can also charge the first battery pack 11 separately, or the first switch K1 can be opened so that the first charging port 101 can only charge the first battery pack 11 and the second battery pack 12 connected in series.

[0096] During the closing of the third switch K3 and the fifth switch K5, the second switch K2 can be closed so that the second charging port 102 can also charge the second battery pack 12 separately. Alternatively, the first switch K1 can be opened so that the second charging port 102 can only charge the first battery pack 11 and the second battery pack 12 connected in series.

[0097] The second switch K2, the third switch K3, the fourth switch K4, and the fifth switch K5 can also be closed simultaneously, so that the first charging port 101 and the second charging port 102 can charge the first battery pack 11 and the second battery pack 12 connected in series at the same time.

[0098] In some embodiments, the fourth switch K4 and the fifth switch K5 may be any of the switching elements, including but not limited to relays, MOSFETs, etc., that can control the on / off state of the circuit.

[0099] In the above technical solution, the first charging port 101 can charge the first battery pack 11 and the second battery pack 12 connected in series through the fourth switch K4, and the second charging port 102 can charge the first battery pack 11 and the second battery pack 12 connected in series through the fifth switch K5. That is, the fourth switch K4 and the fifth switch K5 can further enhance the diversity of charging modes for charging the batteries and meet more charging needs.

[0100] As shown in Figure 5, according to some embodiments of this application, the battery charging system further includes: a first bridge arm 20, with a first end connected to the positive terminal of the battery and a second end connected to the negative terminal of the battery; a first energy storage circuit 21, with a first end connected to the midpoint of the first bridge arm 20 and a second end connected to the connection point of the first battery pack 11 and the second battery pack 12; the first controller 104 is further configured to: alternately discharge the first battery pack 11 to the first energy storage circuit 21 and discharge the first energy storage circuit 21 to the second battery pack 12 through the first bridge arm 20, and / or alternately discharge the second battery pack 12 to the first energy storage circuit 21 and discharge the first energy storage circuit 21 to the first battery pack 11 through the first bridge arm 20.

[0101] Through the first bridge arm and the first energy storage circuit, energy transfer between the first battery pack 11 and the second battery pack 12 can be realized to enable self-heating of the first battery pack 11 and the second battery pack 12.

[0102] In some embodiments, the first bridge arm 20 can be used to alternately discharge the first battery pack 11 to the first energy storage circuit 21 and the first energy storage circuit 21 to the second battery pack 12.

[0103] In other embodiments, the first bridge arm 20 may be used to alternately discharge the second battery pack 12 to the first energy storage circuit 21 and the first energy storage circuit 21 to the first battery pack 11.

[0104] In other embodiments, the first bridge arm 20 can also alternately perform the discharge of the first battery pack 11 to the first energy storage circuit 21 and the discharge of the first energy storage circuit 21 to the second battery pack 12, as well as the discharge of the second battery pack 12 to the first energy storage circuit 21 and the discharge of the first energy storage circuit 21 to the first battery pack 11. Exemplarily, in the first stage of heating, the discharge of the first battery pack 11 to the first energy storage circuit 21 and the discharge of the first energy storage circuit 21 to the second battery pack 12 can be performed alternately multiple times. In the second stage of heating, the discharge of the second battery pack 12 to the first energy storage circuit 21 and the discharge of the first energy storage circuit 21 to the first battery pack 11 can be performed alternately multiple times.

[0105] Compared to alternating between discharging the first battery pack 11 to the first energy storage circuit 21 and discharging the first energy storage circuit 21 to the second battery pack 12 once, and alternating between discharging the second battery pack 12 to the first energy storage circuit 21 and discharging the first energy storage circuit 21 to the first battery pack 11 once, this method can reduce the current frequency passing through the first energy storage circuit 21, achieve low-frequency heating of the battery, and improve the problem of high-frequency howling when the current frequency is too high.

[0106] The first bridge arm 20 may include a first upper bridge arm and a first lower bridge arm. The first upper bridge arm is connected to the positive terminal of the battery, and the first lower bridge arm is connected to the negative terminal of the battery. The first terminal of the first energy storage circuit 21 is connected to the connection point of the first upper bridge arm and the first lower bridge arm. The first upper bridge arm may include a first upper bridge arm switch V1, and the first lower bridge arm may include a first lower bridge arm switch V2. The types of the first upper bridge arm switch V1 and the first lower bridge arm switch V2 include, but are not limited to, MOSFETs or IGBTs (Insulated-Gate Bipolar Transistors).

[0107] The first energy storage circuit 21 may include at least one inductor.

[0108] In the first stage of heating, the first upper bridge arm is turned on and the first lower bridge arm is turned off. The first battery pack 11, the first upper bridge arm, and the first energy storage circuit 21 form a loop, and the first battery pack 11 discharges into the first energy storage circuit 21, which stores energy. The first lower bridge arm is turned on and the first upper bridge arm is turned off, and the first energy storage circuit 21, the first lower bridge arm, and the second battery pack 12 form a loop, releasing energy to the second battery pack 12. That is, in the first stage of heating, the first upper bridge arm and the first lower bridge arm are turned on alternately and sequentially.

[0109] Similarly, in the second stage of heating, the first lower bridge arm and the first upper bridge arm are alternately controlled to conduct in turn, so as to alternately discharge the second battery pack 12 to the first energy storage circuit 21 and the first energy storage circuit 21 to the first battery pack 11.

[0110] In some embodiments, the first upper bridge arm switch V1 is correspondingly provided with a first freewheeling diode D1, and the first lower bridge arm switch V2 is correspondingly provided with a second freewheeling diode D2. During the interval between controlling the switching of the first upper bridge arm to the first lower bridge arm, current can flow through the first freewheeling diode D1, and during the interval between the switching of the first lower bridge arm to the first upper bridge arm, current can flow through the second freewheeling diode D2. This ensures that current always flows through the inductor throughout the entire heating phase, thereby reducing the rate of change of the current through the inductor and facilitating low-frequency heating of the battery.

[0111] Referring to Figure 6, in some embodiments, there can be multiple first bridge arms 20 connected in parallel. The first energy storage circuit 21 may include multiple first inductors L1, the number of which is the same as the number of first bridge arms 20, and each inductor L1 is connected to one of the first bridge arms 20. For example, there may be three first bridge arms 20 and three first inductors L1. The first end of each first inductor L1 is connected to the midpoint of a first bridge arm 20, and the second end is connected to the connection point of the first battery pack 11 and the second battery pack 12. The multiple first bridge arms 20 may be all the arms in a three-phase bridge arm, and the multiple first inductors L1 may be the three-phase windings of a motor.

[0112] Referring to Figure 7, in some other embodiments, there may be multiple first bridge arms 20 connected in parallel. The first energy storage circuit 21 may include multiple first inductors L1 connected in parallel and a second inductor L2 connected in series with the parallel first inductors L1.

[0113] In one example, the number of first inductors L1 can be the same as the number of first bridge arms 20. The first end of the first inductor L1 is connected to the midpoint of the first bridge arm 20, the second end of the first inductor L1 is connected to the first end of the second inductor L2, and the second end of the second inductor L2 is connected to the connection point of the first battery pack 11 and the second battery pack 12.

[0114] In another example, the multiple first bridge arms 20 are two of the three-phase bridge arms connected in parallel. The first inductor L1 and the second inductor L2 can be three-phase windings of a motor. The second end of the second inductor L2 is also connected to the midpoint of the remaining bridge arm in the three-phase bridge arm. In this way, when the battery is a vehicle battery, the existing three-phase bridge arms and three-phase windings in the vehicle can be used to heat the battery, simplifying the circuit and reducing costs.

[0115] In some embodiments, the second end of the first energy storage circuit 21 can be directly connected to the connection point of the first battery pack 11 and the second battery pack 12. When the battery does not need to be heated, the connection between the first energy storage circuit 21 and the battery can be disconnected by turning off the first bridge arm 20, so as not to affect the normal use of the battery.

[0116] In other embodiments, the second terminal of the first energy storage circuit 21 can also be connected between the first upper bridge arm and the first lower bridge arm via the first switch K1. Exemplarily, the second terminal of the first energy storage circuit 21 can be connected to the first terminal of the first switch K1. Thus, when the battery is not charging, opening the first switch K1 simultaneously disconnects the first charging port 101, the second charging port 102, and the connection between the first energy storage circuit 21 and the battery. When it is necessary to heat the battery, closing the first switch K1 allows the battery to be heated via the first bridge arm 20 and the first energy storage circuit 21.

[0117] Understandably, during battery charging, the first switch K1 is closed. If there is no need to heat the battery, the connection between the first energy storage circuit 21 and the battery can be cut off by turning off the first bridge arm 20.

[0118] It is worth noting that the switching on and off of the first switch K1, the second switch K2, the third switch K3, the fourth switch K4, the fifth switch K5, and the first bridge arm 20 in this embodiment can all be executed by the first controller 104.

[0119] The first controller may include, but is not limited to, the vehicle's MCU (Microcontroller Unit) or the controller in the battery's BMS (Battery Management System).

[0120] In some embodiments, the first controller can acquire the temperatures of the first battery pack and the second battery pack, and in response to the temperature of at least one of the first battery pack and the second battery pack being greater than or equal to a preset temperature threshold, control the first switch K1, the second switch K2, the third switch K3, the fourth switch K4 and the fifth switch K5 to enable an external charging device to charge the first battery pack and / or the second battery pack through at least one of the first charging port and the second charging port.

[0121] In some embodiments, the first controller further responds to the temperature of at least one of the first battery pack and the second battery pack being less than a preset temperature threshold by controlling the on / off state of the first bridge arm to perform heating of the first battery pack and the second battery pack.

[0122] In some embodiments, the first controller is a controller in the BMS, and the battery also has a temperature sensor for detecting the temperature of the first battery pack and the second battery pack. The BMS is used to acquire the temperature information detected by the temperature sensor and send the temperature information to the first controller. The first controller can perform the operation of closing or opening the aforementioned switch in response to the received temperature information.

[0123] In the above technical solution, by setting the first bridge arm 20 and the first energy storage circuit 21, energy transfer between the first battery pack 11 and the second battery pack 12 is realized, thereby enabling low-frequency heating of the battery and improving the charging efficiency of the battery.

[0124] As shown in Figures 8 and 9, according to some embodiments of this application, the battery charging system further includes a capacitor C, with a first end connected to the positive terminal of the battery and a second end connected to the negative terminal of the battery.

[0125] During the discharge of energy from the first battery pack 11 to the first energy storage circuit 21 and vice versa via the first bridge arm 20 and the first energy storage circuit 21, the first upper bridge arm is turned on and the first lower bridge arm is turned off. The first battery pack 11, the first upper bridge arm, and the first energy storage circuit 21 form a circuit, and the first battery pack 11 discharges to the first energy storage circuit 21 to store energy. At this time, the capacitor C forms a circuit with the second battery pack 12 through the first upper bridge arm, the first energy storage circuit 21, and discharges to the second battery pack 12, so that current flows through the second battery pack 12.

[0126] When the first lower bridge arm is turned on and the first upper bridge arm is turned off, the first lower bridge arm, the first energy storage circuit 21, and the second battery pack 12 form a circuit. The first energy storage circuit 21 releases electrical energy to the second battery pack 12. At the same time, the capacitor C forms a circuit through the first lower bridge arm, the first energy storage circuit 21, and the first battery pack 11, so that the first battery pack 11 charges the capacitor C, and current also flows through the first battery pack 11.

[0127] Similarly, during the discharge of the second battery pack 12 to the first energy storage circuit 21, the capacitor C discharges to the first battery pack 11, so that current flows through the first battery pack 11. During the discharge of the first energy storage circuit 21 to the first battery pack 11, the second battery pack 12 charges the capacitor C, so that current flows through the second battery pack 12.

[0128] In the above technical solution, by setting capacitor C, current flows through both the first battery pack 11 and the second battery pack 12 during the entire process of heating the battery through the first bridge arm 20 and the first energy storage circuit 21. This helps to maintain the stability of the current flowing through the first battery pack 11 and the second battery pack 12, making the performance of the first battery pack 11 and the second battery pack 12 more stable.

[0129] As shown in Figure 10, this application embodiment provides a charging device 30. The charging device 30 is used to connect to a battery through the battery charging system in the above embodiment to charge the battery. The battery includes a first battery pack 11 and a second battery pack 12 connected in series. The charging device 30 further includes a heating module 201, which is used to connect to the positive terminal and negative terminal of the battery and the connection point of the first battery pack 11 and the second battery pack 12 through a first charging port 101 and a second charging port 102. The charging device 30 is used to: charge at least one of the first battery pack 11 or the second battery pack 12 through the first charging port 101 and / or the second charging port 102 in response to the battery temperature being greater than or equal to a first threshold; and discharge from the first battery pack 11 to the second battery pack 12 and / or discharge from the second battery pack 12 to the first battery pack 11 through the heating module 201 in response to the battery temperature being less than the first threshold.

[0130] Batteries can be used to power electrical devices, which may include, but are not limited to, vehicles.

[0131] The charging device 30 may include a charging pile, which can be connected to the first charging port 101 and the second charging port 102 of the battery charging system to charge the battery.

[0132] In some embodiments, the first charging port 101 and the second charging port 102 can both be DC charging ports, in which case the output port of the charging pile outputs DC power to the first charging port 101 and the second charging port 102 to charge the battery.

[0133] For a description of charging at least one of the first battery pack 11 or the second battery pack 12 through the first charging port 101 and / or the second charging port 102, please refer to the relevant description in the above embodiments, which will not be repeated below.

[0134] Since the positive and negative terminals of the first battery pack 11 are connected to the first charging port 101, and the positive and negative terminals of the second battery pack 12 are connected to the second charging port 102, and the first battery pack 11 and the second battery pack 12 are connected in series, the connection points of the first battery pack 11 and the second battery pack 12 are respectively connected to the first charging port 101 and the second charging port 102. Therefore, the heating module 201 can be connected to the connection point of the first battery pack 11 and the second battery pack 12 by connecting it to either the first charging port 101 or the second charging port 102.

[0135] Understandably, charging efficiency is higher when the battery temperature is greater than or equal to a first threshold. When the battery temperature is below the first threshold, the battery is in a low-temperature state and cannot be charged with a high current, resulting in lower charging efficiency. Therefore, when the temperature of at least one of the first battery pack 11 and the second battery pack 12 is below the first threshold, the heating module 201 performs discharge from the first battery pack 11 to the second battery pack 12, and / or discharge from the second battery pack 12 to the first battery pack 11, to achieve energy transfer between the first battery pack 11 and the second battery pack 12, thereby heating the first battery pack 11 and the second battery pack 12. Once the temperature rises, the battery can continue to be charged.

[0136] In some embodiments, the temperatures of the first battery pack 11 and the second battery pack 12 can be obtained respectively, and the battery can be charged in response to the temperature of both the first battery pack 11 and the second battery pack 12 being greater than or equal to a first threshold. In response to the temperature of at least one of the first battery pack 11 and the second battery pack 12 being less than the first threshold, the battery can be heated by the heating module 201.

[0137] The first threshold can be adjusted depending on the battery type. One method for setting the first threshold is to test the relationship between the battery's charging rate and temperature beforehand. If the charging rate decreases significantly when the temperature is below a certain value, that value can be determined as the first threshold.

[0138] The heating module 201 can be connected to the positive and negative terminals of the battery via the first charging port 101 and the second charging port 102 only when heating the battery is required, and can also be connected to the connection point of the first battery pack 11 and the second battery pack 12 via either the first charging port 101 or the second charging port 102. During battery charging by the charging device 30, the connection between the heating module 201 and the battery can be disconnected to avoid affecting the battery charging process.

[0139] In some embodiments, the heating module 201 can be used to discharge the first battery pack 11 to the second battery pack 12.

[0140] In other embodiments, the heating module 201 can also be used to discharge the second battery pack 12 to the first battery pack 11.

[0141] In some other embodiments, the heating module 201 can also alternately discharge the first battery pack 11 to the second battery pack 12 and discharge the second battery pack 12 to the first battery pack 11 to maintain the charge balance between the first battery pack 11 and the second battery pack 12.

[0142] In some embodiments, the battery charging system may include a battery management system (BMS), and the charging device 30 may include a second controller. The BMS is used to acquire the temperatures of the first battery pack 11 and the second battery pack 12. In response to a temperature of at least one of the first battery pack 11 and the second battery pack 12 being less than a first threshold, the BMS sends a heating command to the second controller. The second controller, in response to the heating command, controls the heating module 201 to heat the batteries. The BMS also sends a charging command to the second controller in response to a temperature of the first battery pack 11 and the second battery pack 12 being greater than or equal to the first threshold. The second controller, in response to the charging command, controls the charging device 30 to charge the batteries.

[0143] The second controller may include, but is not limited to, an MCU.

[0144] In the above technical solution, a heating module 201 is provided in the charging device 30. The heating module 201 can be connected to the first battery pack 11 and the second battery pack 12 respectively to realize energy transfer between the first battery pack 11 and the second battery pack 12. This enables the battery to self-heat at low temperatures during charging by the charging device 30, rapidly increasing the battery temperature and facilitating the use of a high-rate charging current to charge the battery, thereby improving the charging rate. Furthermore, since the heating module 201 is located within the charging device 30, there is no need to install a separate device for battery heating in the electrical equipment, thus reducing the cost of the electrical equipment.

[0145] As shown in Figures 11 to 14, according to some embodiments of this application, the charging device 30 includes: a first output port 202 for connecting to a first charging port 101; a second output port 203 for connecting to a second charging port 102; the heating module 201 includes: a second bridge arm 22, the two ends of which are respectively connected to the first output port 202 and the second output port 203, so as to be connected to the positive and negative terminals of the battery through the first charging port 101 and the second charging port 102; a second energy storage circuit 23, the first end of which is connected to the midpoint of the second bridge arm 22, and the second end of which is connected to the first output port 202. The charging device 30 is configured to: alternately discharge the first battery pack 11 to the second energy storage circuit 23 and the second energy storage circuit 23 to the second battery pack 12 via the second bridge arm 22, so that the first battery pack 11 discharges to the second battery pack 12, and / or alternately discharge the second battery pack 12 to the second energy storage circuit 23 and the second energy storage circuit 23 to the first battery pack 11 via the second bridge arm 22, so that the second battery pack 12 discharges to the first battery pack 11.

[0146] The positive terminal of the first output port 202 is connected to the positive terminal of the first charging port 101, and the negative terminal is connected to the negative terminal of the first charging port 101. The positive terminal of the second output port 203 is connected to the positive terminal of the second charging port 102, and the negative terminal is connected to the negative terminal of the second charging port 102.

[0147] In some embodiments, the charging device 30 can input electrical energy to the first battery pack 11 through the first output port 202 and the first charging port 101 to charge the first battery pack 11, and input electrical energy to the second battery pack 12 through the second output port 203 and the second charging port 102 to charge the second battery pack 12. In this way, the battery can be heated without disconnecting during the charging process.

[0148] In other embodiments, the charging device 30 may also include a dedicated charging port for connecting the first charging port 101 and the second charging port 102 to charge the battery. When heating is required, the connection between the charging port and the first charging port 101 and the second charging port 102 can be disconnected, and the first charging port 101 and the second charging port 102 can be connected to the first output port 202 and the second output port 203.

[0149] In some embodiments, the two ends of the second bridge arm 22 can be connected to the positive terminal of the first output port 202 and the negative terminal of the second output port 203, respectively, to connect to the positive terminal of the first charging port 101 and the negative terminal of the second charging port 102, so as to form a connection with the positive and negative terminals of the battery.

[0150] In other embodiments, the two ends of the second bridge arm 22 may also be connected to the negative terminal of the first output port 202 and the positive terminal of the second output port 203, respectively, to connect to the negative terminal of the first charging port 101 and the positive terminal of the second charging port 102, so as to form a connection with the positive and negative terminals of the battery.

[0151] When the positive terminal of the first output port 202 and the negative terminal of the second output port 203 are respectively connected to the two ends of the second bridge arm 22, the second end of the second energy storage circuit 23 is used to connect the negative terminal of the first output port 202 / the positive terminal of the second output port 203 to the connection point of the first battery pack 11 and the second battery pack 12.

[0152] With the negative terminal of the first output port 202 and the positive terminal of the second output port 203 connected to the two ends of the second bridge arm 22 respectively, the second end of the second energy storage circuit 23 is used to connect the positive terminal of the first output port 202 / the negative terminal of the second output port 203 to the connection point of the first battery pack 11 and the second battery pack 12.

[0153] The second bridge arm 22 may include a second upper bridge arm and a second lower bridge arm, and the first end of the second energy storage circuit 23 is connected to the connection point of the second upper bridge arm and the second lower bridge arm. The second upper bridge arm may be used to connect to the positive terminal of the first charging port 101, and the second lower bridge arm may be used to connect to the negative terminal of the second charging port 102. Alternatively, the second upper bridge arm may be used to connect to the negative terminal of the first charging port 101, and the second lower bridge arm may be used to connect to the positive terminal of the second charging port 102. The second upper bridge arm may include a second upper bridge arm switching transistor V3, and the second lower bridge arm may include a second lower bridge arm switching transistor V4. The types of the second upper bridge arm switching transistor V3 and the second lower bridge arm switching transistor V4 include, but are not limited to, MOSFETs or IGBTs.

[0154] In some embodiments, when heating the battery is not required, the second bridge arm 22 can be completely turned off. When heating the battery is required, the second upper bridge arm and the second lower bridge arm are controlled to alternately conduct, so as to discharge the first battery pack 11 to the second battery pack 12, and / or the second battery pack 12 to the first battery pack 11.

[0155] The following explanation uses the alternating conduction of the second upper bridge arm and the second lower bridge arm to achieve the discharge of the first battery pack 11 to the second battery pack 12, and the discharge of the second battery pack 12 to the first battery pack 11 as an example.

[0156] In the first stage of heating the battery through the second bridge arm 22 and the second energy storage circuit 23, the first operation and the second operation are executed alternately in sequence to alternately discharge the first battery pack 11 to the second energy storage circuit 23 and discharge the second energy storage circuit 23 to the second battery pack 12.

[0157] As shown in Figure 11, the first operation is performed first, which includes: controlling the second upper bridge arm to be turned on and the second lower bridge arm to be turned off. The first battery pack 11, the second upper bridge arm and the second energy storage circuit 23 form a loop. The first battery pack 11 discharges to the second energy storage circuit 23 and the second energy storage circuit 23 stores energy.

[0158] As shown in Figure 12, the second operation is then performed, which includes: controlling the second lower bridge arm to be turned on, the second upper bridge arm to be turned off, the second energy storage circuit 23, the second lower bridge arm and the second battery pack 12 forming a loop, and the second energy storage circuit 23 releasing energy to the second battery pack 12.

[0159] In the second stage of heating the battery via the second bridge arm 22 and the second energy storage circuit 23, the third and fourth operations are performed alternately in sequence to alternately discharge the second battery pack 12 to the second energy storage circuit 23 and discharge the second energy storage circuit 23 to the first battery pack 11.

[0160] As shown in Figure 13, the third operation is performed first. The third operation includes: controlling the second lower bridge arm to be turned on and the second upper bridge arm to be turned off. The second battery pack 12, the second upper bridge arm and the second energy storage circuit 23 form a loop. The second battery pack 12 discharges to the second energy storage circuit 23 and the second energy storage circuit 23 stores energy.

[0161] As shown in Figure 14, the fourth operation is then performed, which includes: controlling the second upper bridge arm to be turned on, the second lower bridge arm to be turned off, the second energy storage circuit 23, the second upper bridge arm and the first battery pack 11 forming a loop, and the second energy storage circuit 23 releasing energy to the first battery pack 11.

[0162] In some embodiments, during the first stage of heating the battery via the second bridge arm 22 and the second energy storage circuit 23, the first and second operations can be performed alternately multiple times, and during the second stage of heating, the third and fourth operations can be performed alternately multiple times. This significantly reduces the current frequency through the second energy storage circuit 23 compared to the first heating stage where the first and second operations are performed alternately only once, and the second heating stage where the third and fourth operations are performed alternately only once. This achieves low-frequency heating of the battery and mitigates the problem of high-frequency whistling when the current frequency is too high.

[0163] For example, as shown in FIG15, FIG15 shows the waveform of the current through the second energy storage circuit 23 when multiple first and second operations are alternately performed in the first stage of heating, and multiple third and fourth operations are alternately performed in the second stage of heating.

[0164] During the first stage of heating, a first operation is performed: the first battery pack 11 discharges into the second energy storage circuit 23, and the current in the second energy storage circuit 23 gradually increases from 0 to a positive first current I. up In the second operation, the second energy storage circuit 23 releases energy to the second battery pack 12. Since the direction of current flow through the second energy storage circuit 23 remains unchanged, the current in the second energy storage circuit 23 changes from the positive first current I. up The second current I gradually decreases to a positive value. down .

[0165] Alternating between the first and second operations, the current in the second energy storage circuit 23 is in the positive first current I. up and the positive second current I down The current alternates between these states until the final second operation ends, at which point the current in the second energy storage circuit 23 becomes 0.

[0166] In the second stage of heating, the third operation is performed: the second battery pack 12 discharges into the second energy storage circuit 23. The current flowing through the second energy storage circuit 23 reverses direction, and the current in the second energy storage circuit 23 gradually increases from 0 to a negative first current -I. up In the fourth operation, the second energy storage circuit 23 releases energy to the first battery pack 11. The current flowing through the second energy storage circuit 23 is still in the opposite direction, so the current in the second energy storage circuit 23 changes from the negative first current -I. up The second current -I gradually decreases to negative. down .

[0167] The third and fourth operations are performed alternately, and the current in the second energy storage circuit 23 is in the negative first current -I. up and the negative second current -I down They alternate between each other.

[0168] Figure 16 shows the waveform of the current through the second energy storage circuit 23 when the first heating stage only alternates between the first operation and the second operation, the second heating stage only alternates between the third operation and the fourth operation, and the battery is controlled to alternate between the first heating stage and the second heating stage.

[0169] In the first stage of heating, the first operation is performed, and the current in the second energy storage circuit 23 gradually increases from 0 to a positive first current I. up The second operation is performed, and the current in the second energy storage circuit 23 changes from the positive first current I. up Gradually decrease to 0.

[0170] In the second stage of heating, the third operation is performed, and the current in the second energy storage circuit 23 gradually increases from 0 to a negative first current -I. up The fourth operation is performed, and the current in the second energy storage circuit 23 changes from the negative first current -I. up Gradually decrease to 0.

[0171] It is not difficult to see that, in the case shown in Figure 15, during the first heating stage and the second heating stage, the current through the second energy storage circuit 23 is in the positive first current I. up and the positive second current I down Alternating between, or in the negative first current -I up and the negative second current -I down The current alternates between these states. In the case shown in Figure 16, the current through the second energy storage circuit 23 is in the positive first current I. up and the negative first current -I up The current changes between the two. It can be seen that the rate of change of the current through the second energy storage circuit 23 in the case shown in Figure 16 is much greater than the rate of change of the current through the second energy storage circuit 23 in the case shown in Figure 15, and thus the frequency of the current through the second energy storage circuit 23 is much greater than the frequency of the current through the second energy storage circuit 23 in the case shown in Figure 15.

[0172] In some embodiments, the second energy storage circuit 23 may be a third inductor.

[0173] In some embodiments, the battery charging system further includes a capacitor C, with its first end connected to the positive terminal of the battery and its second end connected to the negative terminal. During the first operation, capacitor C can discharge to the second battery pack 12, as shown by the dashed line in FIG11. During the second operation, the first battery pack 11 can discharge to capacitor C, as shown by the dashed line in FIG12. During the third operation, capacitor C can discharge to the first battery pack 11, as shown by the dashed line in FIG13. During the fourth operation, the second battery pack 12 can discharge to capacitor C, as shown by the dashed line in FIG14. This ensures that current flows through both the first battery pack 11 and the second battery pack 12 during battery heating, which helps maintain the stability of the current flowing through the first battery pack 11 and the second battery pack 12, resulting in more stable performance of the first battery pack 11 and the second battery pack 12.

[0174] In the above technical solution, energy transfer between the first battery pack 11 and the second battery pack 12 can be achieved through the second bridge arm 22 and the second energy storage circuit 23, resulting in a lower heating current frequency during battery heating and achieving low-frequency heating of the battery. Furthermore, the two ends of the second bridge arm 22 are connected to the positive and negative terminals of the battery through the first charging port 101 and the second charging port 102, respectively, forming a symmetrical structure. This ensures that regardless of whether the second end of the second energy storage circuit 23 is connected to the connection point of the first battery pack 11 and the second battery pack 12 through the first charging port 101 or the second charging port 102, energy transfer between the first battery pack 11 and the second battery pack 12 can be achieved, improving the flexibility of the circuit.

[0175] As shown in Figures 11 to 14, according to some embodiments of this application, the positive terminal of the first charging port 101 is connected to the positive terminal of the battery, the negative terminal of the second charging port 102 is connected to the negative terminal of the battery, the connection point of the first battery pack 11 and the second battery pack 12 is connected to the negative terminal of the first charging port 101 and the positive terminal of the second charging port 102, the first end of the second bridge arm 22 is used to connect to the positive terminal of the first charging port 101 through the first output port 202, and the second end is used to connect to the negative terminal of the second charging port 102 through the second output port 203; the second end of the second energy storage circuit 23 is used to connect to the negative terminal of the first charging port 101 or the positive terminal of the second charging port 102 through the first output port 202 or the second output port 203.

[0176] The two ends of the second bridge arm 22 can be connected to the positive terminal of the first output port 202 and the negative terminal of the second output port 203, respectively, to connect to the positive terminal of the first charging port 101 and the negative terminal of the second charging port 102, respectively. The second end of the second energy storage circuit 23 is used to connect to the negative terminal of the first output port 202 / the positive terminal of the second output port 203, to connect to the connection point of the first battery pack 11 and the second battery pack 12.

[0177] When the first end of the second bridge arm 22 is connected to the positive terminal of the first charging port 101, it can be connected to the positive terminal of the battery. When the second end of the second bridge arm 22 is connected to the negative terminal of the second charging port 102, it can be connected to the negative terminal of the battery.

[0178] In the above technical solution, both ends of the second bridge arm 22 and the second end of the second energy storage circuit 23 can be connected to the battery through the first charging port 101 and the second charging port 102, so that the second bridge arm 22 and the second energy storage circuit 23 can be used to form a circuit for discharging from the first battery pack 11 to the second battery pack 12 and a circuit for discharging from the second battery pack 12 to the first battery pack 11, respectively, thereby realizing the energy transfer between the first battery pack 11 and the second battery pack 12.

[0179] As shown in Figure 17, according to some embodiments of this application, the heating module 201 further includes: a third bridge arm 24, the two ends of which are respectively connected to the first output port 202 and the second output port 203. The first end of the third bridge arm 24 is used to connect to the negative terminal of the first charging port 101 through the first output port 202, and the second end is used to connect to the positive terminal of the second charging port 102 through the second output port 203. The second end of the second energy storage circuit 23 is connected to the midpoint of the third bridge arm 24. The charging device 30 is also used to: control the second end of the second energy storage circuit 23 to connect to the negative terminal of the first charging port 101 or to the positive terminal of the second charging port 102 through the third bridge arm 24.

[0180] The first end of the third bridge arm 24 is connected to the negative terminal of the first output port 202, and the second end is connected to the positive terminal of the second output port 203.

[0181] The third bridge arm 24 includes a third upper bridge arm and a third lower bridge arm. The third upper bridge arm includes a third upper bridge arm switch V5, and the third lower bridge arm includes a third lower bridge arm switch V6. Exemplarily, the third upper bridge arm switch and the third lower bridge arm switch may include, but are not limited to, MOSFETs or IGBTs.

[0182] The second terminal of the second energy storage circuit 23 is connected to the connection point of the third upper bridge arm and the third lower bridge arm. Controlling the third upper bridge arm to be on and the third lower bridge arm to be off, so that the second terminal of the second energy storage circuit 23 is connected to the negative terminal of the first charging port 101, and then to the connection point of the first battery pack 11 and the second battery pack 12. Controlling the third upper bridge arm to be off and the third lower bridge arm to be on, so that the second terminal of the second energy storage circuit 23 is connected to the positive terminal of the second charging port 102, and then to the connection point of the first battery pack 11 and the second battery pack 12.

[0183] In the above technical solution, the third bridge arm 24 allows the second end of the second energy storage circuit 23 to be connected to the connection point of the first battery pack 11 and the second battery pack 12 either through the negative terminal of the first charging port 101 or through the positive terminal of the second charging port 102, thereby improving the practicality of the charging device 30.

[0184] As shown in Figure 18, according to some embodiments of this application, the heating module 201 further includes: a sixth switch K6, the first end of the sixth switch K6 is connected to the second end of the second energy storage circuit 23, and the second end of the sixth switch K6 is connected to the first output port 202 or the second output port 203, so that the second end of the second energy storage circuit 23 is connected to the negative terminal of the first charging port 101 or the positive terminal of the second charging port 102.

[0185] In some embodiments, the second end of the sixth switch K6 is connected to the negative terminal of the first output port 202. Then, the sixth switch K6 can control the second end of the second energy storage circuit 23 to be connected or disconnected from the first output port 202, thereby controlling the connection or disconnection between the second energy storage circuit 23 and the negative terminal of the first charging port 101.

[0186] In some other embodiments, the second end of the sixth switch K6 is connected to the positive terminal of the second output port 203. Then, the sixth switch K6 can control the second end of the second energy storage circuit 23 to be connected or disconnected from the second output port 203, thereby controlling the connection or disconnection between the second energy storage circuit 23 and the positive terminal of the second charging port 102.

[0187] In some embodiments, the sixth switch K6 may include, but is not limited to, a relay. Relays have higher safety and, compared to switching transistors, can greatly reduce the risk of the sixth switch K6 being damaged, thereby improving the reliability of the sixth switch K6.

[0188] In the above technical solution, the sixth switch K6 can control the connection between the second energy storage circuit 23 and the first charging port 101 or the second charging port 102, thereby disconnecting the connection between the second energy storage circuit 23 and the first charging port 101 / second charging port 102 when the charging device 30 is charging the battery, thus improving the safety of charging.

[0189] It is understood that, as shown in Figures 11 to 14, in some embodiments, the second end of the second energy storage circuit 23 can also be directly connected to the first output port 202 or the second output port 203. By switching the second bridge arm 22 on and off, the connection between the second energy storage circuit 23 and the first charging port 101 / second charging port 102 can be disconnected when the charging device 30 is charging the battery.

[0190] As shown in Figures 19 and 20, according to some embodiments of this application, the charging device 30 further includes: a power module 204 connected to a first output port 202 and a second output port 203, for charging at least one of the first battery pack 11 or the second battery pack 12 through the first charging port 101 and the second charging port 102; a second switch module 205 connected between the power module 204 and the first output port 202 and the second output port 203, for enabling connection / disconnection between the power module 204 and the first output port 202 and the second output port 203; both ends of the second bridge arm 22 are respectively connected to the second switch module 205, for connecting to the first output port 202 and the second output port 203 respectively through the second switch module 205; and the second end of the second energy storage circuit 23 is connected to the second switch module 205, for connecting to either the first output port 202 or the second output port 203 through the second switch module 205.

[0191] The power module 204 is used to regulate the voltage and current output by the charging device 30 to match the charging requirements of the battery.

[0192] In some embodiments, if both the first charging port 101 and the second charging port 102 are DC charging ports, the power module 204 can also convert AC power to DC power.

[0193] The power module 204 may include a first positive terminal, a first negative terminal, a second positive terminal, and a second negative terminal. The first positive terminal is connected to the positive terminal of the first output port 202, the first negative terminal is connected to the negative terminal of the first output port 202, the second positive terminal is connected to the positive terminal of the second output port 203, and the second negative terminal is connected to the negative terminal of the second output port 203. The charging current of the power module 204 is output from the first positive terminal to the positive terminal of the battery and then flows back to the power module 204 from the first negative terminal. The charging current of the power module 204 is output from the second positive terminal to the positive terminal of the battery and then flows back to the power module 204 from the second negative terminal.

[0194] The second switch module 205 is connected between the power module 204 and the first output port 202, controlling the on / off state between the power module 204 and the first output port 202. It is also connected between the power module 204 and the second output port 203, controlling the on / off state between the power module 204 and the second output port 203.

[0195] As shown in Figure 20, in some embodiments, the second switch module 205 may include a first main positive relay K11, a first main negative relay K21, a second main positive relay K12, and a second main negative relay K22. The first main positive relay K11 is connected between the first positive terminal of the power module 204 and the positive terminal of the first output port 202, and the first main negative relay K21 is connected between the first negative terminal of the power module 204 and the negative terminal of the first output port 202. The second main positive relay K12 is connected between the second positive terminal of the power module 204 and the positive terminal of the second output port 203, and the second main negative relay K22 is connected between the second negative terminal of the power module 204 and the negative terminal of the second output port 203.

[0196] The first end of the second bridge arm 22 is connected to either end of the first main positive relay K11, the second end of the second bridge arm 22 is connected to either end of the second main negative relay K22, and the second end of the second energy storage circuit 23 is connected to either end of the first main negative relay K21 or either end of the second main positive relay K12.

[0197] When charging the first battery pack 11, both the first main positive relay K11 and the first main negative relay K21 are closed. When charging the second battery pack 12, both the second main positive relay K12 and the second main negative relay K22 are closed. To avoid interference from the heating module during charging, the second upper bridge arm and the second lower bridge arm of the second bridge arm 22 can be turned off during charging, thereby disconnecting the heating module 201 from the first output port 202 and the second output port 203.

[0198] When battery heating is required, the first main positive relay K11 and the second main negative relay K22 are closed, so that the two ends of the second bridge arm 22 are respectively connected to the positive terminal of the first charging port 101 and the negative terminal of the second charging port 102. One of the first main negative relay K21 and the second main positive relay K12 connected to the second terminal of the second energy storage circuit 23 is closed, while the other is open, so that the second terminal of the second energy storage circuit 23 is connected to the connection point of the first battery pack 11 and the second battery pack 12 through either the first charging port 101 or the second charging port 102.

[0199] In the above technical solution, the charging device 30 can connect the power module 204, the second bridge arm 22, and the second energy storage circuit 23 to the first charging port 101 and the second charging port 102 through the second switch module, the first output port 202, and the second output port 203, so that the charging device 30 can have both charging and heating functions at the same time, simplifying the circuit structure of the charging device 30.

[0200] As shown in Figure 21, according to some embodiments of this application, the charging device 30 further includes: a seventh switch K7, through which the first end of the second bridge arm 22 is connected to the second switch module. The charging device 30 further includes: an eighth switch K8, through which the second end of the second bridge arm 22 is connected to the second switch module.

[0201] The seventh switch K7 can be connected between the first main positive relay K11 and the first end of the second bridge arm 22, and the eighth switch K8 can be connected between the second main negative relay K22 and the second end of the second bridge arm 22.

[0202] Among them, the seventh switch K7 can be connected to either end of the first main positive relay K11, and the eighth switch K8 can be connected to either end of the second main negative relay K22.

[0203] In some embodiments, the seventh switch K7 and the eighth switch K8 may include, but are not limited to, relays. Relays have higher safety and, compared to switching transistors, can greatly reduce the risk of breakdown of the first upper bridge arm switching transistor and the first lower bridge arm switching transistor of the first bridge arm 20, thereby improving the reliability of the seventh switch K7 and the eighth switch K8.

[0204] As shown in Figure 22, in some embodiments where the heating module 201 further includes a third bridge arm 24, the charging device 30 may also include a ninth switch K9 and a tenth switch K10. The ninth switch K9 is connected between the first end of the third bridge arm 24 and the first main negative relay K21, and the tenth switch K10 is connected between the second end of the third bridge arm 24 and the second main positive relay K12. The ninth switch K9 and the tenth switch K10 may include, but are not limited to, relays. Through the ninth switch K9 and the tenth switch K10, the connection and disconnection between the third bridge arm 24 and the first output port 202 or the second output port 203 can be controlled. When the battery does not need to be heated, disconnecting the ninth switch K9 and the tenth switch K10 can reduce the risk of the third upper bridge arm switch and the third lower bridge arm switch of the third bridge arm 24 being damaged.

[0205] In some embodiments, when the second energy storage circuit 23 is connected to the sixth switch K6, the sixth switch K6 is connected between the second terminal of the second energy storage circuit 23 and the first main negative relay K21 or the second main positive relay K12.

[0206] It is worth noting that the closing and opening of the second bridge arm 22, the third bridge arm 24, the sixth switch K6, the seventh switch K7, the eighth switch K8, the ninth switch K9, the tenth switch K10, and the second switch module 205 of the charging device 30 in this embodiment can all be executed by the second controller.

[0207] In the above technical solution, the seventh switch K7 and the eighth switch K8 can be controlled to disconnect when the battery does not require heating, thereby disconnecting the heating module 201 from the first charging port 101 and the second charging port 102, reducing the safety hazards when the charging device 30 charges the battery.

[0208] It is understood that, as shown in Figure 20, in some embodiments, the first and second ends of the second bridge arm 22 can also be directly connected to the first main positive relay K11 and the second main negative relay K22, and the second end of the second energy storage circuit 23 can also be directly connected to the first main negative relay K21 or the second main positive relay K12.

[0209] As shown in Figure 10, this application embodiment provides a power supply system for an electrical device, which includes: a battery; a battery charging system as described in the above embodiment; and a charging device 30 as described in the above embodiment. The charging device 30 is used to connect to the battery through the battery charging system to charge the battery. The heating module 201 of the charging device 30 is used to connect to the positive terminal and negative terminal of the battery, as well as the connection point of the first battery pack 11 and the second battery pack 12, through a first charging port 101 and a second charging port 102. The charging device 30 is used to: charge at least one of the first battery pack 11 or the second battery pack 12 through the first charging port 101 and / or the second charging port 102 in response to the battery temperature being greater than or equal to a first threshold; and discharge from the first battery pack 11 to the second battery pack 12 and / or discharge from the second battery pack 12 to the first battery pack 11 through the heating module 201 in response to the battery temperature being less than the first threshold.

[0210] The structure of the charging device 30, the structure of the battery charging system, the method of connecting the charging device 30 to the battery through the battery charging system, and the method of charging at least one of the first battery pack 11 or the second battery pack 12 through the first charging port 101 and / or the second charging port 102, and the alternating discharge of the first battery pack 11 to the second battery pack 12 and the discharge of the second battery pack 12 to the first battery pack 11 by the heating module 201, can be referred to the relevant descriptions in the above embodiments, and will not be repeated below.

[0211] A heating module 201 is provided in the charging device 30, which enables the battery to self-heat in a low-temperature state during the charging process of the charging device 30, quickly raising the battery temperature, facilitating the use of a high-rate charging current to charge the battery, and improving the charging rate of the battery.

[0212] Referring to Figures 23 and 10, this application embodiment provides a power supply method for electrical equipment, applied to the power supply system of the electrical equipment in the above embodiments, including:

[0213] Step 110: Connect the positive and negative terminals of the first battery pack 11 to the first charging port 101, and connect the positive and negative terminals of the second battery pack 12 to the second charging port 102, respectively.

[0214] Step 120: Obtain the battery temperature;

[0215] Step 130: In response to the battery temperature being greater than or equal to a first threshold, control the first charging port 101 and / or the second charging port 102 to charge at least one of the first battery pack 11 and the second battery pack 12.

[0216] Step 140: In response to the battery temperature being lower than the first threshold, the control heating module 201 is connected to the positive and negative terminals of the battery and the connection point of the first battery pack 11 and the second battery pack 12 through the first charging port 101 and the second charging port 102, and the heating module 201 is used to discharge the first battery pack 11 to the second battery pack 12 and / or discharge the second battery pack 12 to the first battery pack 11.

[0217] In step 110, the connection between the first battery pack 11 and the first charging port 101, and the connection between the second battery pack 12 and the second charging port 102, can be referred to the relevant descriptions in the above embodiments, and will not be repeated below.

[0218] In step 120, a temperature sensor can be installed in the electrical equipment to detect the temperature of the first battery pack 11 and the second battery pack 12.

[0219] In step 130, when the temperatures of both the first battery pack 11 and the second battery pack 12 are greater than or equal to the first threshold, the batteries are charged. Temperature data can be sent to the BMS, and the BMS, in response to the received temperature data indicating that the temperatures of both the first battery pack 11 and the second battery pack 12 are greater than the first threshold, sends a charging command to the charging device 30.

[0220] In step 140, when the temperature of at least one of the first battery pack 11 and the second battery pack 12 is lower than the first threshold, the battery is heated. In response to the received temperature data indicating that the temperature of at least one of the first battery pack 11 and the second battery pack 12 is lower than the first threshold, the BMS sends a heating command to the charging device 30.

[0221] It is worth noting that in step 140, the positive terminal of the control battery is connected to the first charging port 101, the negative terminal of the battery is connected to the second charging port 102, and the connection points of the first battery pack 11 and the second battery pack 12 are respectively connected to the first charging port 101 and the second charging port 102.

[0222] The method for selecting the first threshold can be found in the relevant descriptions in the above embodiments, and will not be repeated hereafter.

[0223] For details regarding step 140, please refer to the relevant descriptions in the above embodiments, which will not be repeated hereafter.

[0224] In the above technical solution, during the charging of the battery by the charging device 30, the battery can be self-heated at low temperature, which can quickly increase the battery temperature, making it easier to use a high-rate charging current to charge the battery and improve the charging rate of the battery.

[0225] As shown in Figures 11 to 14, according to some embodiments of this application, the heating module includes: a second bridge arm 22 and a second energy storage circuit 23. The two ends of the second bridge arm 22 are respectively used to connect to the positive and negative terminals of the battery through the first charging port 101 and the second charging port 102. The first end of the second energy storage circuit 23 is used to connect to the midpoint of the second bridge arm 22, and the second end of the second energy storage circuit 23 is used to connect to the connection point of the first battery pack 11 and the second battery pack 12 through the first charging port 101 or the second charging port 102.

[0226] The discharge of the first battery pack 11 to the second battery pack 12 includes: alternately discharging the first battery pack 11 to the second energy storage circuit 23 and discharging the second energy storage circuit 23 to the second battery pack 12 through the second bridge arm 22.

[0227] The discharge of the second battery pack 12 to the first battery pack 11 includes: alternately discharging the second battery pack 12 to the second energy storage circuit 23 and discharging the second energy storage circuit 23 to the first battery pack 11 through the second bridge arm 22.

[0228] The structure of the second bridge arm 22 and the second energy storage circuit 23 can be referred to the relevant description in the above embodiments, and will not be repeated below.

[0229] In some embodiments, the charging device 30 includes a first output port 202 and a second output port 203. The two ends of the second bridge arm 22 are respectively connected to the first output port 202 and the second output port 203 to connect to the first charging port 101 and the second charging port 102, respectively. The second end of the second energy storage circuit 23 is connected to either the first output port 202 or the second output port 203 to connect to either the first charging port 101 or the second charging port 102. The manner in which the second bridge arm 22 and the second energy storage circuit 23 are connected to the first charging port 101 and the second charging port 102 via the first output port 202 and the second output port 203 can be referred to the relevant descriptions in the above embodiments, and will not be repeated below.

[0230] In some embodiments, during the discharge of the first battery pack 11 to the second battery pack 12, the steps of the first battery pack 11 discharging to the second energy storage circuit 23 and the second energy storage circuit 23 discharging to the second battery pack 12 can be alternately performed once or multiple times via the second bridge arm 22. During the discharge of the second battery pack 12 to the first battery pack 11, the steps of the second battery pack 12 discharging to the second energy storage circuit 23 and the second energy storage circuit 23 discharging to the first battery pack 11 can be alternately performed once or multiple times via the second bridge arm 22.

[0231] The methods for alternately discharging the first battery pack 11 to the second energy storage circuit 23 and the second energy storage circuit 23 to the second battery pack 12 via the second bridge arm 22, and the methods for alternately discharging the second battery pack 12 to the second energy storage circuit 23 and the second energy storage circuit 23 to the first battery pack 11 via the second bridge arm 22, can be referred to the relevant descriptions in the above embodiments, and will not be repeated below.

[0232] In the above technical solution, energy transfer between the first battery pack 11 and the second battery pack 12 can be achieved through the second bridge arm 22 and the second energy storage circuit 23, so that the heating current frequency is low during battery heating, thereby achieving low-frequency heating of the battery.

[0233] As shown in Figures 3 and 11 to 14, according to some embodiments of this application, the negative terminal of the first battery pack 11 is connected to the positive terminal of the second battery pack 12; the first end of the second bridge arm 22 is used to connect to the positive terminal of the first charging port 101, and the second end is used to connect to the negative terminal of the second charging port 102; the second end of the second energy storage circuit 23 is used to connect to the negative terminal of the first charging port 101 or the positive terminal of the second charging port 102; the first switch module 103 includes: a first switch K1, the first end of which is connected to the negative terminal of the first charging port 101 and the positive terminal of the second charging port 102, and the second end of which is connected to the connection point of the first battery pack 11 and the second battery pack 12; a second switch K2, the first end of which is connected to the positive terminal of the first charging port 101, and the second end of which is connected to the positive terminal of the first battery pack 11; and a third switch K3, the first end of which is connected to the negative terminal of the second charging port 102, and the second end of which is connected to the negative terminal of the second battery pack 12.

[0234] When the first switch module includes a first switch K1, a second switch K2 and a third switch K3, as shown in Figures 24 to 26, step 130 may include: controlling the first switch K1 and the second switch K2 to close and the third switch K3 to open, so that the first charging port 101 charges the first battery pack 11.

[0235] Alternatively, step 130 may also include: controlling the first switch K1 and the third switch K3 to close, and the second switch K2 to open, so that the second charging port 102 charges the second battery pack 12.

[0236] Alternatively, step 130 may also include: controlling the first switch K1, the second switch K2 and the third switch K3 to close, so that the first charging port 101 and the second charging port 102 simultaneously charge the first battery pack 11 and the second battery pack 12 respectively.

[0237] As shown in Figure 27, step 140 includes:

[0238] Step 1401: Control the first switch K1, the second switch K2, and the third switch K3 to close;

[0239] Step 1402: Control the first end of the second bridge arm 22 to connect to the positive terminal of the first charging port 101, and the second end to connect to the negative terminal of the second charging port 102; and control the second end of the second energy storage circuit 23 to connect to the negative terminal of the first charging port 101 or to the positive terminal of the second charging port 102.

[0240] It is understood that in step 130, the heating module 201 is disconnected from the first charging port 101 and the second charging port 102, so as not to affect the normal charging of the battery. For example, the second upper bridge arm switch and the second lower bridge arm switch of the second bridge arm 22 can be turned off to disconnect the connection between the second bridge arm 22, the second energy storage circuit 23 and the first charging port 101 and the second charging port 102.

[0241] Steps 1401 and 1402 can be executed simultaneously or sequentially. This application embodiment does not impose a specific limitation on the execution order of steps 1401 and 1402.

[0242] In step 1402, the second upper bridge arm is connected to the positive terminal of the first battery pack 11 through the positive terminal of the first charging port 101, and the second lower bridge arm is connected to the negative terminal of the second battery pack 12 through the negative terminal of the second charging port 102; the second terminal of the second energy storage circuit 23 is connected to the connection point of the first battery pack 11 and the second battery pack 12 through the first charging port 101 or the second charging port 102.

[0243] The description of the method for step 1402 can be found in the relevant descriptions in the above embodiments, and will not be repeated below.

[0244] In some embodiments, the battery charging system includes a BMS, and the charging device 30 includes a second controller. The BMS is used to acquire the temperatures of the first battery pack 11 and the second battery pack 12. In response to the temperature of the first battery pack 11 and the second battery pack 12 being greater than or equal to a first threshold, the BMS sends a charging command to the second controller to cause the charging device 30 to perform step 130. In response to the temperature of at least one of the first battery pack 11 and the second battery pack 12 being less than the first threshold, the BMS sends a heating command to the second controller to cause the charging device 30 to perform step 140.

[0245] In the above technical solution, by setting the first switch K1, the second switch K2 and the third switch K3, not only can different charging modes be switched, but they can also be used to connect the heating module 201 with the battery, realize self-heating during the battery charging process and improve charging efficiency.

[0246] As shown in Figures 11 to 14, according to some embodiments of this application, the second bridge arm 22 includes a second upper bridge arm and a second lower bridge arm. The second upper bridge arm is used to connect to the positive terminal of the first charging port 101, and the second lower bridge arm is used to connect to the negative terminal of the second charging port 102.

[0247] As shown in Figures 28 and 29, the discharge of the first battery pack 11 to the second battery pack 12 and / or the discharge of the second battery pack 12 to the first battery pack 11 via the second bridge arm 22 and the second energy storage circuit 23 includes:

[0248] Execute step 1403, sequentially and alternately control the second upper bridge arm to conduct and the second lower bridge arm to conduct, so that the first battery pack 11 discharges to the second battery pack 12, and / or execute step 1404, sequentially and alternately control the second lower bridge arm to conduct and the second upper bridge arm to conduct, so that the second battery pack 12 discharges to the first battery pack 11.

[0249] You may execute either step 1403 or step 1404, or you may execute steps 1403 and 1404 alternately.

[0250] In step 1403, the steps of controlling the second upper bridge arm to conduct and the second lower bridge arm to conduct can be performed alternately once or multiple times.

[0251] In step 1404, the steps of controlling the second lower bridge arm to conduct and the second upper bridge arm to conduct can be performed alternately once or multiple times.

[0252] The methods for steps 1403 and 1404 can be referred to the relevant descriptions in the above embodiments, and will not be repeated hereafter.

[0253] The above technical solution can reduce the frequency of the current flowing through the first battery pack 11 and the second battery pack 12 during the heating process, thereby improving the heating efficiency of the battery.

[0254] According to some embodiments of this application, the first switch module 103 further includes: a fourth switch K4, the first end of which is connected to the negative terminal of the first charging port 101, and the second end of which is connected to the negative terminal of the second battery pack 12; and a fifth switch K5, the first end of which is connected to the positive terminal of the second charging port 102, and the second end of which is connected to the positive terminal of the first battery pack 11.

[0255] Step 130 also includes performing any of the following steps:

[0256] The second switch K2 and the fourth switch K4 are closed, and the first switch K1, the third switch K3 and the fifth switch K5 are opened, so that the first charging port 101 can charge the first battery pack 11 and the second battery pack 12.

[0257] The third switch K3 and the fifth switch K5 are closed, and the first switch K1, the second switch K2 and the fourth switch K4 are opened, so that the second charging port 102 can charge the first battery pack 11 and the second battery pack 12.

[0258] The second switch K2, the third switch K3, the fourth switch K4 and the fifth switch K5 are closed, and the first switch K1 is opened, so that the first charging port 101 and the second charging port 102 can charge the first battery pack 11 and the second battery pack 12 simultaneously.

[0259] Control the first switch K1, the second switch K2, the third switch K3 and the fifth switch K5 to close, and the fourth switch K4 to open, so that the first charging port 101 charges the first battery pack 11, and the second charging port 102 charges the first battery pack 11 and the second battery pack 12.

[0260] The first switch K1, the second switch K2, the third switch K3 and the fourth switch K4 are closed, and the fifth switch K5 is opened, so that the first charging port 101 charges the first battery pack 11 and the second battery pack 12, and the second charging port 102 charges the second battery pack 12.

[0261] In this embodiment of the application, the on / off states of the first switch K1, the second switch K2, the third switch K3, the fourth switch K4, the fifth switch K5, and the first bridge arm 20 can all be executed by the first controller 104.

[0262] The first controller 104 can communicate with the BMS. The first controller 104 responds to the instructions issued by the BMS to perform the operation of closing or opening the above-mentioned switch. The instructions issued by the BMS can be a pre-set program.

[0263] The above technical solutions can improve the diversity of charging modes for charging batteries and meet more charging needs.

[0264] As shown in Figures 11 to 14, according to some embodiments of this application, the battery is also connected in parallel with a capacitor C, and the method further includes:

[0265] During the discharge of the first battery pack 11 to the second battery pack 12, the discharge of the first battery pack 11 to the second energy storage circuit 23 and the discharge of capacitor C to the second battery pack 12 are simultaneously performed through the second bridge arm 22, and the discharge of the second energy storage circuit 23 to the second battery pack 12 and the discharge of the first battery pack 11 to capacitor C are simultaneously performed through the second bridge arm 22, and / or during the discharge of the second battery pack 12 to the first battery pack 11, the discharge of the second battery pack 12 to the second energy storage circuit 23 and the discharge of capacitor C to the first battery pack 11 are simultaneously performed through the second bridge arm 22, and the discharge of the second energy storage circuit 23 to the first battery pack 11 and the discharge of the second battery pack 12 to capacitor C are simultaneously performed through the second bridge arm 22.

[0266] As shown in Figures 11 to 14, the first end of capacitor C is connected to the positive terminal of the battery, and the second end is connected to the negative terminal of the battery.

[0267] The capacitor C has the function of storing electrical energy. During the discharge of the first battery pack 11 to the second energy storage circuit 23, the first battery pack 11, the second energy storage circuit 23 and the second upper bridge arm constitute the circuit for the first battery pack 11 to discharge to the first energy storage circuit 21, and the capacitor C, the second upper bridge arm, the second energy storage circuit 23 and the second battery pack 12 constitute the circuit for the capacitor C to discharge to the second battery pack 12.

[0268] During the discharge of the second energy storage circuit 23 to the second battery pack 12, the second battery pack 12, the second energy storage circuit 23 and the second lower bridge arm constitute the discharge loop of the first energy storage circuit 21 to the second battery pack 12, and the capacitor C, the second lower bridge arm, the second energy storage circuit 23 and the first battery pack 11 constitute the discharge loop of the first battery pack 11 to the capacitor C.

[0269] Similarly, during the discharge of the second battery pack 12 to the second energy storage circuit 23, capacitor C, the second lower bridge arm, the second energy storage circuit 23, and the first battery pack 11 constitute a circuit for capacitor C to discharge to the first battery pack 11. During the discharge of the second energy storage circuit 23 to the first battery pack 11, capacitor C, the second upper bridge arm, the second energy storage circuit 23, and the second battery pack 12 constitute a circuit for the second battery pack 12 to discharge to capacitor C.

[0270] In the above technical solution, by setting capacitor C, during the discharge of the first battery pack 11 to the second battery pack 12 and the discharge of the second battery pack 12 to the first battery pack 11 through the second bridge arm 22 and the second energy storage circuit 23, current is always flowing through the first battery pack 11 and the second battery pack 12, which helps to maintain the stability of the current flowing through the first battery pack 11 and the second battery pack 12 and extend the service life of the first battery pack 11 and the second battery pack 12.

[0271] As shown in Figure 5, according to some embodiments of this application, the battery is also connected to the first bridge arm 20, the positive terminal of the battery is connected to the first end of the first bridge arm 20, the negative terminal of the battery is connected to the second end of the first bridge arm 20, the midpoint of the first bridge arm 20 is connected to the first end of the first energy storage circuit 21, and the second end of the first energy storage circuit 21 is connected to the connection point of the first battery pack 11 and the second battery pack 12.

[0272] As shown in Figures 30 and 31, the method also includes:

[0273] Step 151 is executed, through the first bridge arm 20, the first battery pack 11 is alternately discharged to the first energy storage circuit 21 and the first energy storage circuit 21 is alternately discharged to the second battery pack 12, and / or step 152 is executed, through the first bridge arm 20, the second battery pack 12 is alternately discharged to the first energy storage circuit 21 and the first energy storage circuit 21 is alternately discharged to the first battery pack 11.

[0274] The structure of the first bridge arm 20 and the first energy storage circuit 21 can be referred to the relevant description in the above embodiments, and will not be repeated below.

[0275] In some embodiments, step 151 or step 152 may be performed in response to the temperature of either the first battery pack 11 or the second battery pack 12 being less than a first threshold.

[0276] The execution methods for steps 151 and 152 can be found in the relevant descriptions in the above embodiments, and will not be repeated hereafter.

[0277] In the above technical solution, the first bridge arm 20 and the first energy storage circuit 21 are directly connected to the battery. In this way, even when the battery is not connected to the charging device 30, the battery can still be heated through the first bridge arm 20 and the first energy storage circuit 21 to meet the battery's heating requirements.

[0278] This application provides a power supply system for an electrical device. Referring to Figures 17 to 22, the power supply system includes a battery, a battery charging system, and a charging device 30. The battery includes a first battery pack 11 and a second battery pack 12 connected in series. The battery charging system includes a first charging port 101 for connecting the positive and negative terminals of the first battery pack 11; a second charging port 102 for connecting the positive and negative terminals of the second battery pack 12; a first switch module 103 for controlling the connection / disconnection of the battery with the first charging port 101 and / or the second charging port 102; and a first controller 104 configured to control the first switch module 103 to connect the battery with the first charging port and / or the second charging port, so that the first battery pack and / or the second battery pack can be charged through one of the first charging port or the second charging port, or the first battery pack and / or the second battery pack can be charged simultaneously through the first charging port and the second charging port.

[0279] The charging device 30 is connected to the first charging port 101 and the second charging port 102. The charging device 30 is used to charge at least one of the first battery pack 11 or the second battery pack 12 through the first charging port 101 and / or the second charging port 102 in response to the battery temperature being greater than or equal to a first threshold.

[0280] The negative terminal of the first battery pack 11 is connected to the positive terminal of the second battery pack 12. The first switch module 103 includes: a first switch K1, the first end of which is connected to the negative terminal of the first charging port 101 and the positive terminal of the second charging port 102, and the second end of which is connected to the connection point of the first battery pack 11 and the second battery pack 12; a second switch K2, the first end of which is connected to the positive terminal of the first charging port 101, and the second end of which is connected to the positive terminal of the first battery pack 11; and a third switch K3, the first end of which is connected to the negative terminal of the second charging port 102, and the second end of which is connected to the negative terminal of the second battery pack 12.

[0281] The first switch module 103 further includes: a fourth switch K4, the first end of which is connected to the negative terminal of the first charging port 101, and the second end of which is connected to the negative terminal of the second battery pack 12; and a fifth switch K5, the first end of which is connected to the positive terminal of the second charging port 102, and the second end of which is connected to the positive terminal of the first battery pack 11.

[0282] The battery charging system further includes: a first bridge arm 20, with a first end connected to the positive terminal of the battery and a second end connected to the negative terminal of the battery; a first energy storage circuit 21, with a first end connected to the midpoint of the first bridge arm 20 and a second end connected to the connection point of the first battery pack 11 and the second battery pack 12; and a first controller 104 is further configured to: alternately discharge the first battery pack 11 to the first energy storage circuit 21 and the first energy storage circuit 21 to the second battery pack 12 via the first bridge arm 20, and alternately discharge the second battery pack 12 to the first energy storage circuit 21 and the first energy storage circuit 21 to the first battery pack 11 via the first bridge arm 20.

[0283] The battery charging system also includes a capacitor C, with one end of the capacitor C connected to the positive terminal of the battery and the other end connected to the negative terminal of the battery.

[0284] The charging device 30 also includes a heating module 201, which includes a second bridge arm 22. The two ends of the second bridge arm 22 are connected to the positive and negative terminals of the battery through a first charging port 101 and a second charging port 102, respectively. The second energy storage circuit 23 has a first end connected to the midpoint of the second bridge arm 22 and a second end connected to the connection point of the first battery pack 11 and the second battery pack 12 through the first charging port 101 or the second charging port 102.

[0285] The charging device 30 is configured to: in response to the temperature of at least one of the first battery pack 11 and the second battery pack 12 being less than a first threshold, control the two ends of the second bridge arm 22 to be connected to the positive and negative terminals of the battery respectively through the first charging port 101 and the second charging port 102, and control the second end to be connected to the connection point of the first battery pack 11 and the second battery pack 12 through the first charging port 101 or the second charging port 102, and alternately execute the steps of the first battery pack 11 discharging to the second energy storage circuit 23 and the second energy storage circuit 23 discharging to the second battery pack 12 through the second bridge arm 22, so that the first battery pack 11 discharges to the second battery pack 12, and alternately execute the steps of the second battery pack 12 discharging to the second energy storage circuit 23 and the second energy storage circuit 23 discharging to the first battery pack 11 through the second bridge arm 22, so that the second battery pack 12 discharges to the first battery pack 11.

[0286] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery charging system, the battery comprising a first battery pack and a second battery pack connected in series, the battery charging system comprising: The first charging port is used to connect the positive and negative terminals of the first battery pack. The second charging port is used to connect the positive and negative terminals of the second battery pack. The first switch module is used to connect / disconnect the battery from the first charging port and the second charging port; The first controller is configured as follows: The first switch module controls the connection of the battery to the first charging port and / or the second charging port, so that the first battery pack and / or the second battery pack can be charged through one of the first charging port or the second charging port. The first battery pack and / or the second battery pack can be charged simultaneously through the first charging port and the second charging port.

2. The battery charging system according to claim 1, wherein, The negative terminal of the first battery pack is connected to the positive terminal of the second battery pack, and the first switch module includes: A first switch, the first end of which is connected to the negative terminal of the first charging port and the positive terminal of the second charging port, and the second end of which is connected to the connection point of the first battery pack and the second battery pack; The second switch has a first end connected to the positive terminal of the first charging port and a second end connected to the positive terminal of the first battery pack. The third switch has its first end connected to the negative terminal of the second charging port and its second end connected to the negative terminal of the second battery pack.

3. The battery charging system according to claim 2, wherein, The first switch module also includes: The fourth switch has its first end connected to the negative terminal of the first charging port and its second end connected to the negative terminal of the second battery pack. The fifth switch has its first end connected to the positive terminal of the second charging port and its second end connected to the positive terminal of the first battery pack.

4. The battery charging system according to any one of claims 1-3, wherein, The battery charging system also includes: The first bridge arm has a first end connected to the positive terminal of the battery and a second end connected to the negative terminal of the battery. A first energy storage circuit, wherein a first end of the first energy storage circuit is connected to the midpoint of the first bridge arm, and a second end is connected to the connection point of the first battery pack and the second battery pack; The first controller is also configured to: Through the first bridge arm, the discharge of the first battery pack to the first energy storage circuit and the discharge of the first energy storage circuit to the second battery pack are performed alternately, and / or The second battery pack discharges to the first energy storage circuit and the first energy storage circuit discharges to the first battery pack alternately via the first bridge arm.

5. The battery charging system according to claim 4, wherein, The battery charging system further includes a capacitor, with a first end connected to the positive terminal of the battery and a second end connected to the negative terminal of the battery.

6. A charging device for connecting to a battery via a battery charging system according to any one of claims 1-5 to charge the battery, the battery comprising a first battery pack and a second battery pack connected in series, the charging device comprising: A heating module is used to connect to the positive and negative terminals of the battery and the connection point of the first and second battery packs via a first charging port and a second charging port. The charging device is used for: In response to the battery temperature being greater than or equal to a first threshold, at least one of the first battery pack or the second battery pack is charged through the first charging port and / or the second charging port; In response to the battery temperature being lower than the first threshold, the heating module performs the discharge of the first battery pack to the second battery pack and / or the discharge of the second battery pack to the first battery pack.

7. The charging device according to claim 6, wherein, The charging device includes: The first output port is used to connect to the first charging port; The second output port is used to connect to the second charging port; The heating module includes: The second bridge arm has its two ends connected to the first output port and the second output port, respectively, so as to be connected to the positive and negative terminals of the battery through the first charging port and the second charging port. A second energy storage circuit has its first terminal connected to the midpoint of the second bridge arm, and its second terminal connected to either the first or second output port, so as to be connected to the connection point of the first and second battery packs via either the first or second charging port. The charging device is used for: Through the second bridge arm, the discharge of the first battery pack to the second energy storage circuit and the discharge of the second energy storage circuit to the second battery pack are alternately performed, so that the first battery pack discharges to the second battery pack, and / or The second bridge arm alternately discharges the second battery pack to the second energy storage circuit and the second energy storage circuit discharges to the first battery pack, so that the second battery pack discharges to the first battery pack.

8. The charging device according to claim 7, wherein, The positive terminal of the first charging port is connected to the positive terminal of the battery, and the negative terminal of the second charging port is connected to the negative terminal of the battery. The connection point between the first battery pack and the second battery pack is connected to the negative terminal of the first charging port and the positive terminal of the second charging port. The first end of the second bridge arm is used to connect to the positive terminal of the first charging port through the first output port, and the second end is used to connect to the negative terminal of the second charging port through the second output port. The second terminal of the second energy storage circuit is used to connect to the negative terminal of the first charging port or the positive terminal of the second charging port through the first output port or the second output port.

9. The charging device according to claim 8, wherein, The heating module also includes: The third bridge arm has its two ends connected to the first output port and the second output port, respectively. The first end of the third bridge arm is used to connect to the negative terminal of the first charging port through the first output port, and the second end is used to connect to the positive terminal of the second charging port through the second output port. The second end of the second energy storage circuit is connected to the midpoint of the third bridge arm. The charging device is also used for: The third bridge arm controls the second terminal of the second energy storage circuit to be connected to the negative terminal of the first charging port, or to the positive terminal of the second charging port.

10. The charging device according to claim 8, wherein, The heating module also includes: A sixth switch, the first end of which is connected to the second end of the second energy storage circuit, and the second end of which is connected to the first output port or the second output port, so that the second end of the second energy storage circuit is connected to the negative terminal of the first charging port or the positive terminal of the second charging port.

11. The charging device according to any one of claims 7-10, wherein, The charging device further includes: A power module is connected to the first output port and the second output port to charge at least one of the first battery pack or the second battery pack through the first charging port and the second charging port. The second switch module is connected between the power module and the first output port and the second output port, and is used to realize the connection / disconnection between the power module and the first output port and the second output port; The two ends of the second bridge arm are respectively connected to the second switch module, so as to be connected to the first output port and the second output port respectively through the second switch module; The second terminal of the second energy storage circuit is connected to the second switching module, so as to be connected to either the first output port or the second output port through the second switching module.

12. The charging device according to claim 11, wherein, The charging device further includes: The seventh switch connects the first end of the second bridge arm to the second switch module. The eighth switch connects the second end of the second bridge arm to the second switch module.

13. A power supply system for electrical equipment, comprising: Battery; The battery charging system according to any one of claims 1-5; The charging device according to any one of claims 6-12 is used to connect to the battery through the battery charging system to charge the battery, and the heating module of the charging device is used to connect to the positive terminal, negative terminal and connection point of the battery, and the first battery pack and the second battery pack through the first charging port and the second charging port. The charging device is used to: in response to the temperature of the battery being greater than or equal to a first threshold, charge at least one of the first battery pack or the second battery pack through the first charging port and / or the second charging port; In response to the battery temperature being lower than the first threshold, the heating module performs the discharge of the first battery pack to the second battery pack and / or the discharge of the second battery pack to the first battery pack.

14. A method for supplying power to an electrical device, applied to the power supply system of the electrical device as described in claim 13, the method comprising: Connect the positive and negative terminals of the first battery pack to the first charging port, and connect the positive and negative terminals of the second battery pack to the second charging port, respectively. Obtain the temperature of the battery; In response to the battery temperature being greater than or equal to a first threshold, the first charging port and / or the second charging port are controlled to charge at least one of the first battery pack and the second battery pack; In response to the battery temperature being lower than the first threshold, the control heating module is connected to the positive and negative terminals of the battery and the connection point of the first and second battery packs through the first and second charging ports, and performs the discharge of the first battery pack to the second battery pack and / or the discharge of the second battery pack to the first battery pack through the heating module.

15. The method according to claim 14, wherein, The heating module includes a second bridge arm and a second energy storage circuit. The two ends of the second bridge arm are respectively connected to the positive and negative terminals of the battery via the first charging port and the second charging port. The first end of the second energy storage circuit is connected to the midpoint of the second bridge arm, and the second end of the second energy storage circuit is connected to the connection point of the first battery pack and the second battery pack via either the first charging port or the second charging port. The process of discharging the first battery pack to the second battery pack includes: The second bridge arm alternately performs the discharge of the first battery pack to the second energy storage circuit and the discharge of the second energy storage circuit to the second battery pack. The process of discharging the second battery pack into the first battery pack includes: The second bridge arm alternately performs the discharge of the second battery pack to the second energy storage circuit and the discharge of the second energy storage circuit to the first battery pack.

16. The method according to claim 15, wherein, The negative terminal of the first battery pack is connected to the positive terminal of the second battery pack. The first end of the second bridge arm is connected to the positive terminal of the first charging port, and the second end is connected to the negative terminal of the second charging port. The second end of the second energy storage circuit is connected to either the negative terminal of the first charging port or the positive terminal of the second charging port. The first switch module includes: a first switch, the first end of which is connected to the negative terminal of the first charging port and the positive terminal of the second charging port, and the second end of which is connected to the connection point of the first battery pack and the second battery pack; a second switch, the first end of which is connected to the positive terminal of the first charging port, and the second end of which is connected to the positive terminal of the first battery pack; and a third switch, the first end of which is connected to the negative terminal of the second charging port, and the second end of which is connected to the negative terminal of the second battery pack. Controlling one of the first charging port or the second charging port to charge the first battery pack or the second battery pack includes: Control the first and second switches to close, and the third switch to open, so that the first charging port charges the first battery pack; or Control the first switch and the third switch to close, and the second switch to open, so that the second charging port charges the second battery pack; or Control the first switch, the second switch and the third switch to close, so that the first charging port and the second charging port can charge the first battery pack and the second battery pack simultaneously, respectively; The control heating module is connected to the positive and negative terminals of the battery, as well as the connection points of the first and second battery packs, via a first charging port and a second charging port, including: Control the first switch, the second switch, and the third switch to close; The system controls the first end of the second bridge arm to be connected to the positive terminal of the first charging port, and the second end to be connected to the negative terminal of the second charging port. It also controls the second end of the second energy storage circuit to be connected to either the negative terminal of the first charging port or the positive terminal of the second charging port.

17. The method according to claim 16, wherein, The second bridge arm includes a second upper bridge arm and a second lower bridge arm. The second upper bridge arm is used to connect to the positive terminal of the first charging port, and the second lower bridge arm is used to connect to the negative terminal of the second charging port. The process of discharging the first battery pack to the second battery pack and / or discharging the second battery pack to the first battery pack via the second bridge arm and the second energy storage circuit includes: The second upper bridge arm and the second lower bridge arm are alternately controlled to conduct in sequence, so that the first battery pack discharges to the second battery pack, and / or The second lower bridge arm and the second upper bridge arm are alternately turned on in sequence, so that the second battery pack discharges to the first battery pack.

18. The method according to claim 16 or 17, wherein, The first switch module further includes: a fourth switch, the first end of which is connected to the negative terminal of the first charging port and the second end of which is connected to the negative terminal of the second battery pack; and a fifth switch, the first end of which is connected to the positive terminal of the second charging port and the second end of which is connected to the positive terminal of the first battery pack. The step of controlling the first charging port and / or the second charging port to charge at least one of the first battery pack and the second battery pack further includes performing any of the following steps: The second and fourth switches are closed, while the first, third, and fifth switches are open, so that the first charging port charges the first and second battery packs. The third and fifth switches are closed, while the first, second, and fourth switches are open, so that the second charging port charges the first and second battery packs. The second switch, the third switch, the fourth switch, and the fifth switch are closed, and the first switch is opened, so that the first charging port and the second charging port can charge the first battery pack and the second battery pack simultaneously. The first switch, the second switch, the third switch, and the fifth switch are closed, and the fourth switch is open, so that the first charging port charges the first battery pack, and the second charging port charges the first battery pack and the second battery pack. The first switch, the second switch, the third switch, and the fourth switch are controlled to be closed, and the fifth switch is opened, so that the first charging port charges the first battery pack and the second battery pack, and the second charging port charges the second battery pack.

19. The method according to any one of claims 15-18, wherein, The battery is also connected in parallel with a capacitor, and the method further includes: During the discharge of the first battery pack to the second battery pack, the discharge of the first battery pack to the second energy storage circuit and the discharge of the capacitor to the second battery pack are simultaneously performed via the second bridge arm. Through the second bridge arm, the second energy storage circuit simultaneously discharges to the second battery pack and the first battery pack discharges to the capacitor, and / or During the discharge of the second battery pack to the first battery pack, the second bridge arm simultaneously discharges the second battery pack to the second energy storage circuit and the capacitor to the first battery pack. The second bridge arm simultaneously enables the second energy storage circuit to discharge to the first battery pack and the second battery pack to discharge to the capacitor.

20. The method according to any one of claims 14-18, wherein, The battery is also connected to a first bridge arm, with the positive terminal of the battery connected to a first end of the first bridge arm and the negative terminal of the battery connected to a second end of the first bridge arm. The midpoint of the first bridge arm is connected to a first end of a first energy storage circuit, and the second end of the first energy storage circuit is connected to the connection point of the first battery pack and the second battery pack. The method further includes: Through the first bridge arm, the discharge of the first battery pack to the first energy storage circuit and the discharge of the first energy storage circuit to the second battery pack are performed alternately, and / or The second battery pack discharges to the first energy storage circuit and the first energy storage circuit discharges to the first battery pack alternately via the first bridge arm.

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