Battery charging control method and circuit, battery system, and electric device

Abstract

This application provides a battery charging control method and circuit, a battery system, and an electrical device, belonging to the field of battery technology. The battery is connected to a first switching circuit, which includes a first connection point, a second connection point, and a third connection point interconnected by switching elements. The first connection point is connected to the positive terminal of the battery, and the second connection point is connected to the negative terminal of the battery. A second terminal of a first energy storage circuit is also connected to a first terminal of a second switching circuit. The second terminal of the second switching circuit is connected to the midpoint between a first battery pack and a second battery pack. Either the first or second connection point is also connected to a first terminal of an external energy device. The third connection point is connected to the first terminal of the first energy storage circuit, and the second terminal of the first energy storage circuit is connected to the second terminal of the external energy device. The method includes: through the first switching circuit, executing actions such as charging the first energy storage circuit by the external energy device and jointly charging the battery by the external energy device and the first energy storage circuit.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery charging control method and circuit, a battery system, and an electrical device. Background Technology

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0003] The charging efficiency of a battery is related to the voltage output by the charging device. If the output voltage of the charging device is too low, it may cause a mismatch between the output voltage of the charging device and the voltage of the battery or a slow charging speed, resulting in low charging efficiency of the battery. Summary of the Invention

[0004] This application aims to at least address one of the technical problems existing in the background art. Therefore, one objective of this application is to provide a battery charging control method and circuit, a battery system, and an electrical device to improve battery charging efficiency.

[0005] An embodiment of the first aspect of this application provides a battery charging control method. The battery includes a first battery pack and a second battery pack connected in series. The battery is connected to a first switching circuit. The first switching circuit includes a first connection point, a second connection point, and a third connection point interconnected by switching elements. The first connection point is connected to the positive terminal of the battery, and the second connection point is connected to the negative terminal of the battery. A second terminal of a first energy storage circuit is also connected to a first terminal of a second switching circuit. The second terminal of the second switching circuit is connected to the midpoint between the first battery pack and the second battery pack. The first connection point or the second connection point is also connected to a first terminal of an external energy device. The third connection point is connected to a first terminal of the first energy storage circuit, and the second terminal of the first energy storage circuit is connected to a second terminal of the external energy device. The method includes: through the first switching circuit, executing the external energy device charging the first energy storage circuit and the external energy device and the first energy storage circuit jointly charging the battery.

[0006] In the technical solution of this application embodiment, an external energy device is connected to a switching circuit and a first energy storage circuit. This allows the switching circuit to control the external energy device and the first energy storage circuit to form a loop, charging the first energy storage circuit and enabling it to store energy. The first end of the external energy device can also be connected to the positive or negative terminal of the battery via a first or second connection point. The second end of the external energy device is connected to the first energy storage circuit. Furthermore, by controlling the switching circuit, the external energy device and the first energy storage circuit can be connected in series to form a loop with the battery. Because the first energy storage circuit stores energy, the voltage after the external energy device and the first energy storage circuit are connected in series is higher than the output voltage of the external energy device. Therefore, by controlling the external energy device and the first energy storage circuit to charge the battery together, boost charging of the battery can be achieved, improving the charging efficiency.

[0007] In some embodiments, a voltage regulator circuit is connected in parallel between the first and second terminals of the external energy device. The voltage regulator circuit includes a first capacitor. Before the external energy device charges the first energy storage circuit and the external energy device and the first energy storage circuit jointly charge the battery, the method further includes: charging the first capacitor by the battery through the first switching circuit and the first energy storage circuit. That is, the first capacitor can also be charged by the first energy storage circuit, so that the first capacitor plays a voltage stabilizing role during the external energy device charging the battery, thereby further improving the charging efficiency of the battery.

[0008] In some embodiments, the method further includes: acquiring the temperature of the battery; in response to the battery temperature being greater than or equal to a preset temperature threshold, executing an external energy device charging a first energy storage circuit and the external energy device and the first energy storage circuit jointly charging the battery via a first switching circuit; and in response to the battery temperature being less than the preset temperature threshold, heating the battery via the first switching circuit, a second switching circuit, and the first energy storage circuit. Thus, during charging, if the battery temperature is low, heating the battery can raise its temperature, and charging after the temperature has increased can further improve the battery's charging efficiency.

[0009] In some embodiments, heating the battery in response to its temperature being lower than a preset temperature threshold, via a first switching circuit, a second switching circuit, and a first energy storage circuit, includes: controlling the battery to be in a first heating stage in response to its temperature being lower than the preset temperature threshold, via the first switching circuit, the second switching circuit, and the first energy storage circuit; wherein the first heating stage includes: repeatedly performing the operation of the first battery pack charging the first energy storage circuit and the first energy storage circuit charging the second battery pack N2 times via the first switching circuit and the second switching circuit; N2 is an integer greater than or equal to 1. This not only reduces the current frequency flowing through the first energy storage circuit in the first heating stage and reduces current ripple, but also allows the first heating stage to be maintained for a longer period, improving the heating efficiency of the battery and enabling more efficient charging of the battery.

[0010] In some embodiments, heating the battery in response to its temperature being lower than a preset temperature threshold, via a first switching circuit, a second switching circuit, and a first energy storage circuit, includes: controlling the battery to alternately operate in a first heating stage and a second heating stage via the first switching circuit and the second switching circuit, in response to the battery temperature being lower than the preset temperature threshold; wherein, the first heating stage includes: repeatedly performing the operation of the first battery pack charging the first energy storage circuit and the first energy storage circuit charging the second battery pack N2 times via the first switching circuit and the second switching circuit, where N2 is an integer greater than or equal to 1; the second heating stage includes: repeatedly performing the operation of the second battery pack charging the first energy storage circuit and the first energy storage circuit charging the first battery pack N3 times via the first switching circuit and the second switching circuit, where N3 is an integer greater than or equal to 1. In this way, after heating is completed, the energy balance between the first battery pack and the second battery pack can be maintained, thus maintaining battery stability and further improving the charging efficiency when the battery is recharged after heating is completed.

[0011] In some embodiments, a second energy storage circuit is connected in parallel across the two ends of the battery. The first end of the second energy storage circuit is connected to the positive terminal of the battery, and the second end is connected to the negative terminal. The first heating stage further includes: repeatedly performing the operation of the first battery pack charging the second energy storage circuit and the second energy storage circuit charging the second battery pack N4 times via a first switching circuit and a second switching circuit, where N4 is an integer greater than or equal to 1. The second energy storage circuit can also realize energy transfer from the first battery pack to the second battery pack, further improving the battery's heating efficiency.

[0012] In some embodiments, the first heating stage further includes: simultaneously charging the first energy storage circuit and the second energy storage circuit of the first battery pack via the first switching circuit and the second switching circuit, and simultaneously charging the second energy storage circuit and the first battery pack of the second energy storage circuit via the first switching circuit and the second switching circuit. Thus, during the first heating stage, the first and second energy storage circuits ensure that current always flows through the first and second battery packs, which helps maintain the stability of the current flowing through the first and second battery packs, improving the heating efficiency of the batteries while ensuring relatively stable performance of the first and second battery packs.

[0013] In some embodiments, a second energy storage circuit is connected in parallel across the two ends of the battery. The first end of the second energy storage circuit is connected to the positive terminal of the battery, and the second end is connected to the negative terminal. The first heating stage further includes: repeatedly performing the operation of charging the second energy storage circuit from the first battery pack and charging the second battery pack from the second energy storage circuit N4 times via the first and second switching circuits, where N4 is an integer greater than or equal to 1; and / or the second heating stage further includes: performing the operation of charging the second energy storage circuit from the second battery pack and charging the first battery pack from the second energy storage circuit N5 times via the first and second switching circuits, where N5 is an integer greater than or equal to 1. The second energy storage circuit can also realize energy transfer from the first battery pack to the second battery pack, and / or energy transfer from the second battery pack to the first battery pack, further improving the battery's heating efficiency.

[0014] In some embodiments, the first heating stage further includes: simultaneously charging the first energy storage circuit and the second energy storage circuit of the first battery pack through the first switching circuit and the second switching circuit, and simultaneously charging the second energy storage circuit and the first battery pack of the second energy storage circuit through the first switching circuit and the second switching circuit; and / or the second heating stage further includes: simultaneously charging the first energy storage circuit and the second energy storage circuit of the second battery pack through the first switching circuit and the second switching circuit, and simultaneously charging the first energy storage circuit and the second battery pack of the second energy storage circuit through the first switching circuit and the second switching circuit. Thus, in the first heating stage and / or the second heating stage, the first energy storage circuit and the second energy storage circuit ensure that current always flows through the first battery pack and the second battery pack, which helps maintain the stability of the current flowing through the first battery pack and the second battery pack, improving the heating efficiency of the batteries while making the performance of the first battery pack and the second battery pack more stable.

[0015] In some embodiments, a first end of the external energy device is connected to a second connection point. A first switching circuit includes a bridge arm, comprising an upper bridge arm and a lower bridge arm connected in series. The upper bridge arm is connected to the first connection point, and the lower bridge arm is connected to the second connection point. The node between the upper and lower bridge arms serves as a third connection point. The first switching circuit enables the external energy device to charge the first energy storage circuit and the external energy device and the first energy storage circuit to jointly charge the battery. This includes: controlling the upper bridge arm and the second switching circuit to turn off, and the lower bridge arm to turn on, to enable the external energy device to charge the first energy storage circuit; and controlling the lower bridge arm and the second switching circuit to turn off, and the upper bridge arm to turn on, to enable the external energy device and the first energy storage circuit to jointly charge the battery. By controlling the separate conduction of the upper and lower bridge arms, the external energy device and the first energy storage circuit can perform boost charging of the battery, simplifying the battery charging control method.

[0016] In some embodiments, where a voltage regulator circuit is connected in parallel between the first and second terminals of the external energy device, and the voltage regulator circuit includes a first capacitor, before the external energy device alternately charges the first energy storage circuit and the external energy device and the first energy storage circuit jointly charge the battery via the first switching circuit, the method further includes: controlling the upper bridge arm to turn on and the lower bridge arm to turn off, so as to execute the battery charging the first capacitor. By controlling the bridge arm, the first capacitor can also be charged so that the first capacitor plays a voltage stabilizing role during the external energy device charging the battery, further improving the charging efficiency of the battery while simplifying the battery charging control method.

[0017] In some embodiments, controlling the battery to be in a first heating stage includes: sequentially and alternately executing a first step and a second step. The first step includes: controlling the upper bridge arm and the second switching circuit to be turned on, and the lower bridge arm to be turned off; the second step includes: controlling the lower bridge arm and the second switching circuit to be turned on, and the upper bridge arm to be turned off. By controlling only the bridge arm and the second bridge arm, the switching between battery heating and charging can be achieved, further improving battery charging efficiency while simplifying the charging control method.

[0018] In some embodiments, the method includes controlling the battery to be in the second heating stage in response to the battery temperature being lower than a preset temperature threshold, by controlling the battery to alternately be in a first heating stage and a second heating stage via a first switching circuit and a second switching circuit. The method further includes sequentially and alternately executing the second step and the first step. This simplifies the control method while ensuring energy balance between the first and second battery packs after heating is complete, guaranteeing high charging efficiency during subsequent battery charging.

[0019] An embodiment of the second aspect of this application provides a battery charging control circuit. The battery includes a first battery pack and a second battery pack connected in series. The charging control circuit includes a first switching circuit, comprising a first connection point, a second connection point, and a third connection point interconnected by a switching element. The first connection point is connected to the positive terminal of the battery, and the second connection point is connected to the negative terminal of the battery. The first or second connection point is also used to connect to a first terminal of an external energy device. A second switching circuit is included, with its first terminal connected to a second terminal of a first energy storage circuit and its second terminal connected to the midpoint between the first and second battery packs. A first energy storage circuit is included, with its first terminal connected to the third connection point and its second terminal used to connect to a second terminal of the external energy device. The circuit further includes a controller configured to, via the first switching circuit, execute actions such as charging the first energy storage circuit by the external energy device and jointly charging the battery by the external energy device and the first energy storage circuit. The switching element allows any two of the first, second, and third connection points of the first switching circuit to be connected, thereby selectively connecting only the first energy storage circuit and the external energy device, allowing the external energy device to charge the first energy storage circuit and the first energy storage circuit to store energy. It can also connect the first energy storage circuit, the battery, and the external energy device through the first switching circuit, so that the external energy device can be connected in series with the first energy storage circuit to charge the battery together, realizing boost charging of the battery. That is, boost charging of the battery can be achieved by simply setting the first switching circuit and the first energy storage circuit, simplifying the circuit and improving the charging efficiency of the battery.

[0020] In some embodiments, the charging control circuit further includes a voltage regulator circuit, which includes a first capacitor. A first terminal of the voltage regulator circuit is connected to a second terminal of the first energy storage circuit, and the second terminal of the voltage regulator circuit is connected to either a first connection point or a second connection point. The voltage regulator circuit is used to connect in parallel between the first and second terminals of the external energy device during battery charging. In other words, the first energy storage circuit can not only charge the battery but also charge the first capacitor, enabling the first capacitor to stabilize the voltage during battery charging by the external energy device, thereby further improving the charging efficiency of the battery.

[0021] In some embodiments, the controller is further configured to: acquire the battery temperature; in response to the battery temperature being greater than or equal to a preset temperature threshold, execute, via a first switching circuit, an external energy device charging a first energy storage circuit and the external energy device and the first energy storage circuit jointly charging the battery; and in response to the battery temperature being less than the preset temperature threshold, heat the battery via the first switching circuit, a second switching circuit, and the first energy storage circuit. The second switching circuit enables the first energy storage circuit to also heat the battery, allowing switching to battery heating when the battery temperature is low without increasing circuit complexity, thereby raising the battery temperature before charging, and further improving battery charging efficiency.

[0022] In some embodiments, the charging control circuit further includes a voltage regulator circuit, which includes: a first capacitor; a first switch, wherein the first switch and the first capacitor are connected in series between a second terminal of the first energy storage circuit and a first connection point / second connection point. The voltage regulator circuit is used to be connected in parallel to the first and second terminals of the external energy device during battery charging by the external energy device. The controller is configured to: control the first switch to close in response to a battery temperature greater than or equal to a preset temperature threshold; and control the first switch to close in response to a battery temperature less than the preset temperature threshold. Thus, during battery charging by the external energy device, the first switch is closed, allowing the first capacitor to be connected in parallel to the external energy device, thereby stabilizing the voltage and improving charging efficiency. During battery heating, the first switch is open, disconnecting the voltage regulator circuit from the first energy storage circuit, thus preventing any impact on the current flow in the heating circuit during battery heating via the first switch circuit, the second switch circuit, and the first energy storage circuit, and consequently preventing any adverse effects on battery heating.

[0023] In some embodiments, the controller is configured to: in response to the battery temperature being lower than a preset temperature threshold, control the battery to be in a first heating stage via a first switching circuit, a second switching circuit, and a first energy storage circuit to heat the battery; wherein, the first heating stage includes: repeatedly performing the operation of the first battery pack charging the first energy storage circuit and the first energy storage circuit charging the second battery pack N2 times via the first switching circuit and the second switching circuit, where N2 is an integer greater than or equal to 1. This not only reduces the current frequency flowing through the first energy storage circuit in the first heating stage and reduces current ripple, but also allows the first heating stage to be maintained for a longer period, improving the heating efficiency of the battery and enabling more efficient charging of the battery.

[0024] In some embodiments, the charging control circuit further includes a second energy storage circuit, a first terminal of which is connected to the positive terminal of the battery, and a second terminal of which is connected to the negative terminal of the battery. The controller is further configured to, during the first heating phase, repeatedly execute the operation of the first battery pack charging the second energy storage circuit and the second energy storage circuit charging the second battery pack N4 times via a first switching circuit and a second switching circuit, where N4 is an integer greater than or equal to 1. The second energy storage circuit can also realize energy transfer from the first battery pack to the second battery pack, further improving the heating efficiency of the battery.

[0025] In some embodiments, the controller is configured to: during the first heating phase, simultaneously execute the charging of the first energy storage circuit by the first battery pack and the charging of the second energy storage circuit by the second energy storage circuit via the first switching circuit and the second switching circuit; and simultaneously execute the charging of the second energy storage circuit by the first energy storage circuit and the charging of the second energy storage circuit by the first battery pack via the first switching circuit and the second switching circuit. Thus, during the first heating phase, the first and second energy storage circuits ensure that current always flows through the first and second battery packs, which helps maintain the stability of the current flowing through the first and second battery packs, improving the heating efficiency of the batteries while ensuring relatively stable performance of the first and second battery packs.

[0026] In some embodiments, the controller is configured to: in response to the battery temperature being lower than a preset temperature threshold, control the battery to alternately enter a first heating stage and a second heating stage via a first switching circuit and a second switching circuit to heat the battery; wherein, the first heating stage includes: repeatedly performing the operation of the first battery pack charging the first energy storage circuit and the first energy storage circuit charging the second battery pack N2 times via the first switching circuit and the second switching circuit, where N2 is an integer greater than or equal to 1; the second heating stage includes: repeatedly performing the operation of the second battery pack charging the first energy storage circuit and the first energy storage circuit charging the first battery pack N3 times via the first switching circuit and the second switching circuit, where N3 is an integer greater than or equal to 1. The second energy storage circuit can also realize energy transfer from the first battery pack to the second battery pack, and / or energy transfer from the second battery pack to the first battery pack, further improving the battery heating efficiency.

[0027] In some embodiments, a second energy storage circuit is connected in parallel across the two ends of the battery. The first end of the second energy storage circuit is connected to the positive terminal of the battery, and the second end is connected to the negative terminal. The controller is further configured to: during the first heating phase, repeatedly execute the operation of the first battery pack charging the second energy storage circuit and the second energy storage circuit charging the second battery pack N4 times via the first and second switching circuits, where N4 is an integer greater than or equal to 1; and / or during the second heating phase, execute the operation of the second battery pack charging the second energy storage circuit and the second energy storage circuit charging the first battery pack N5 times via the first and second switching circuits, where N5 is an integer greater than or equal to 1. The second energy storage circuit can also realize energy transfer from the first battery pack to the second battery pack, and / or energy transfer from the second battery pack to the first battery pack, further improving the battery's heating efficiency.

[0028] In some embodiments, the controller is configured to: during a first heating phase, simultaneously execute the charging of the first battery pack to the first energy storage circuit and the charging of the second energy storage circuit to the second battery pack via the first and second switching circuits, and simultaneously execute the charging of the first energy storage circuit to the second battery pack and the charging of the first battery pack to the second energy storage circuit via the first and second switching circuits; and / or during a second heating phase, simultaneously execute the charging of the second battery pack to the first energy storage circuit and the charging of the second energy storage circuit to the first battery pack via the first and second switching circuits, and simultaneously execute the charging of the first energy storage circuit to the first battery pack and the charging of the second battery pack to the second energy storage circuit via the first and second switching circuits. Thus, during the first heating phase and / or the second heating phase, current flows through the first and second energy storage circuits, which helps maintain the stability of the current flowing through the first and second battery packs, improving the heating efficiency of the batteries while ensuring relatively stable performance of the first and second battery packs.

[0029] In some embodiments, the first energy storage circuit includes at least one inductor, and the second energy storage circuit includes a second capacitor. Inductors have better energy storage capabilities than capacitors, enabling higher energy transfer efficiency between the first and second battery packs. Capacitors are smaller than inductors and can achieve rapid charging and discharging, ensuring that current always flows through the first and second battery packs during the first heating phase. Ensuring that current always flows through the first and second battery packs during the first and / or second heating phases helps maintain the stability of the current flowing through them, while also reducing the size and weight of the battery heating circuit and saving costs.

[0030] In some embodiments, the first switching circuit includes a bridge arm, which includes an upper bridge arm and a lower bridge arm connected in series. The upper bridge arm is connected to a first connection point, and the lower bridge arm is connected to a second connection point. The node between the upper and lower bridge arms serves as a third connection point. By controlling only the upper and lower bridge arms, the external energy device and the first energy storage circuit can perform boost charging of the battery, simplifying the structure of the charging control circuit and the control method.

[0031] An embodiment of the third aspect of this application provides a battery system that includes the charging control circuit described in the above embodiments.

[0032] An embodiment of the fourth aspect of this application provides an electrical device that includes the battery system described in the above embodiments, the battery system being used to provide electrical energy.

[0033] 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

[0034] 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.

[0035] Figure 1 This is a schematic diagram of the vehicle structure according to some embodiments of this application;

[0036] Figure 2 This is one of the functional block diagrams of a battery charging control circuit according to some embodiments of this application;

[0037] Figure 3 This is a second functional block diagram of a battery charging control circuit according to some embodiments of this application;

[0038] Figure 4 This is one of the structural schematic diagrams of a battery charging control circuit according to some embodiments of this application;

[0039] Figure 5 This is one of the flowcharts for a battery charging control method according to some embodiments of this application;

[0040] Figure 6 This is a second flowchart of a battery charging control method according to some embodiments of this application;

[0041] Figure 7 This is a second schematic diagram of the structure of a battery charging control circuit according to some embodiments of this application;

[0042] Figure 8 This is the third flowchart of a battery charging control method according to some embodiments of this application;

[0043] Figure 9 The diagram shows the current waveform of the battery in the first heating stage in the battery charging control method of some embodiments of this application.

[0044] Figure 10 A current waveform diagram for controlling the battery in the first heating stage in a battery charging control method;

[0045] Figure 11 This is the fourth flowchart of a battery charging control method according to some embodiments of this application;

[0046] Figure 12 This is the third schematic diagram of the battery charging control circuit of some embodiments of this application;

[0047] Figure 13 This is a fourth schematic diagram of the battery charging control circuit of some embodiments of this application;

[0048] Figure 14 This is one of the schematic diagrams of the current path for controlling the battery to be in the first heating stage in the battery charging control method of some embodiments of this application;

[0049] Figure 15 This is a second schematic diagram of the current path for controlling the battery to be in the first heating stage in a battery charging control method according to some embodiments of this application.

[0050] Figure 16 This is one of the schematic diagrams of the current path for controlling the battery to be in the second heating stage in the battery charging control method of some embodiments of this application;

[0051] Figure 17 This is a second schematic diagram of the current path for controlling the battery to be in the second heating stage in a battery charging control method according to some embodiments of this application.

[0052] Figure 18 This is the fifth schematic diagram of the battery charging control circuit of some embodiments of this application;

[0053] Figure 19 This is a schematic diagram of the current path for controlling the battery to charge the first capacitor in a battery charging control method of some embodiments of this application;

[0054] Figure 20 A schematic diagram of the current path for controlling an external energy device to charge a first energy storage circuit in a battery charging control method according to some embodiments of this application;

[0055] Figure 21This is a schematic diagram of the current path for controlling an external energy device and a first energy storage circuit to charge a battery in a battery charging control method according to some embodiments of this application.

[0056] Figure 22 A schematic diagram of the current path for performing the first step to put the battery into a first heating stage in a battery charging control method of some embodiments of this application;

[0057] Figure 23 A schematic diagram of the current path for performing the second step to put the battery into a first heating stage in a battery charging control method of some embodiments of this application;

[0058] Figure 24 A schematic diagram of the current path for performing the second step to put the battery into a second heating stage in a battery charging control method of some embodiments of this application;

[0059] Figure 25 This is a schematic diagram of the current path for performing the first step to put the battery into a second heating stage in a battery charging control method according to some embodiments of this application.

[0060] Explanation of reference numerals in the attached figures:

[0061] 1000 vehicles;

[0062] Battery 100, first switching circuit 101, first energy storage circuit 102, energy device 103, voltage regulator circuit 104, second switching circuit 105, second energy storage circuit 106;

[0063] Vehicle controller 200;

[0064] Motor 300;

[0065] First battery pack 11, second battery pack 12;

[0066] Current sensor 20, first connector 21, second connector 22, bridge arm 23;

[0067] First capacitor C1, second capacitor C2, charging positive relay K11, charging negative relay K12, first inductor L1, second inductor L2, upper bridge arm switch V3, lower bridge arm switch V4, first connection point P1, second connection point P2, third connection point P3, first resistor R1, first switch V1, second switch V2. Detailed Implementation

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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).

[0074] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of power battery applications, market demand is also constantly increasing.

[0075] The charging efficiency of a battery is related to the voltage output by the charging device. If the output voltage of the charging device is too low, it may lead to a voltage mismatch with the battery or a slow charging speed, resulting in low charging efficiency.

[0076] For example, before charging a vehicle's battery, a boost module installed in the vehicle is used to increase the battery's voltage to improve charging efficiency. If the charging station's output voltage is lower than the battery's voltage, it may result in insufficient charging current or failure to charge the battery, leading to low charging efficiency.

[0077] Based on the above considerations, a battery charging control method is designed. The battery is connected to a first switching circuit. The first connection point and the second connection point of the first switching circuit are connected to the positive and negative terminals of the battery, respectively. The third connection point of the first switching circuit is connected to the first terminal of a first energy storage circuit. The first and second terminals of an external energy device are connected to the second terminal of the first energy storage circuit and the first connection point / second connection point, respectively. This allows the external energy device to form a circuit with the first energy storage circuit to charge it. Furthermore, the switching circuit can be controlled so that the external energy device is connected to the battery through the first connection point / second connection point, forming a circuit with the first energy storage circuit and the battery. Because the first energy storage circuit is charged and stores energy, the voltage of the external energy device and the first energy storage circuit connected in series is higher than the output voltage of the external energy device. Thus, by controlling the external energy device and the first energy storage circuit to charge the battery together, boost charging of the battery can be achieved, improving the charging efficiency.

[0078] The battery charging control method disclosed in this application can be used, but is not limited to, for charging batteries in electrical devices such as vehicles, ships, or aircraft.

[0079] 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.

[0080] 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.

[0081] Please refer to Figure 1 , Figure 1This is a schematic diagram of the structure of a vehicle 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.

[0082] 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.

[0083] like Figure 2 and Figure 3 As shown, this application provides a battery charging control method. The battery 100 includes a first battery pack 11 and a second battery pack 12 connected in series. The battery is connected to a first switching circuit 101. The first switching circuit 101 includes a first connection point P1, a second connection point P2, and a third connection point P3 connected to each other through switching elements. The first connection point P1 is connected to the positive terminal of the battery 100, and the second connection point P2 is connected to the negative terminal of the battery 100. The second end of the first energy storage circuit 102 is also connected to the first end of the second switching circuit 105. The second end of the second switching circuit 105 is connected to the midpoint between the first battery pack 11 and the second battery pack 12. The first connection point P1 or the second connection point P2 is also connected to the first end of an external energy device 103. The third connection point P3 is connected to the first end of the first energy storage circuit 102, and the second end of the first energy storage circuit 102 is connected to the second end of the external energy device 103.

[0084] The methods include:

[0085] The first switching circuit 101 enables the external energy device 103 to charge the first energy storage circuit 102 and the external energy device 103 and the first energy storage circuit 102 to charge the battery 100 together.

[0086] The step of charging the first energy storage circuit 102 by the external energy device 103 precedes the step of charging the battery 100 by the external energy device 103 and the first energy storage circuit 102 together, so that after the first energy storage circuit 102 is boosted, it is connected in series with the external energy device 103, thereby increasing the series voltage to boost the charging of the battery 100.

[0087] The first connection point P1 can be the node connecting the first switching circuit 101 and the positive terminal of the battery 100, the second connection point P2 can be the node connecting the first switching circuit 101 and the negative terminal of the battery 100, and the third connection point P3 can be the node connecting the first energy storage circuit 102 and the first switching circuit 101.

[0088] The first connection point P1, the second connection point P2, and the third connection point P3 are interconnected by a switching element. That is, any two of the first connection point P1, the second connection point P2, and the third connection point P3 can be connected by a switching element. For example, when the first connection point P1 and the second connection point P2 are connected by a switching element, a path is formed between the first connection point P1 and the second connection point P2.

[0089] It is understandable that the first connection point P1, the second connection point P2, and the third connection point P3 can all be connected.

[0090] In some embodiments, the switching element may include, but is not limited to, a MOS transistor (Metal-Oxide-Semiconductor Field-Effect Transistor), an IGBT transistor (Insulated-Gate Bipolar Transistor), or a relay, or other elements capable of controlling the on / off state of a circuit.

[0091] like Figure 2 As shown, in some embodiments, the first end of the external power device 103 can be connected to the first connection point P1, that is, connected to the positive terminal of the battery 100.

[0092] Since the first terminal of the first energy storage circuit 102 is connected to the third connection point P3, when the first connection point P1 and the third connection point P3 are connected through a switching element, the first terminal of the first energy storage circuit 102 can be connected in series with the external energy device 103 through the first switching circuit 101, thereby enabling the external energy device 103 to charge the first energy storage circuit 102. After the first energy storage circuit 102 is charged, it stores energy, causing the voltage across the first energy storage circuit 102 to increase.

[0093] When the second connection point P2 and the third connection point P3 are connected through a switching element, the first terminal of the external energy device 103 is connected to the positive terminal of the battery 100, and the second terminal is connected to the second terminal of the first energy storage circuit 102. The first terminal of the first energy storage circuit 102 is connected to the negative terminal of the battery 100 through the first switching circuit 101, so that the external energy device 103, the first energy storage circuit 102, and the battery 100 are connected in series. The voltage of the external energy device 103 and the first energy storage circuit 102 connected in series increases, and they discharge together to the battery 100, thus boosting and charging the battery 100. The voltage of the external energy device 103 and the first energy storage circuit 102 connected in series is higher than the voltage of the battery 100, thus charging the battery 100.

[0094] It is understood that when the first end of the external energy device 103 is connected to the first connection point P1 to connect to the positive terminal of the battery 100, in order to ensure that the external energy device 103 can charge the battery 100, the first end of the external energy device 103 can be a positive output terminal, and the second end can be a negative output terminal. The external energy device 103 outputs current through the positive output terminal, and the negative output terminal is used to form a current loop. In some embodiments, the external energy device 103 further includes a positive charging relay K11 and a negative charging relay K12. The positive charging relay K11 is connected to the positive output terminal, and the negative charging relay K12 is connected to the negative output terminal. The first energy storage circuit 102 and the first switching circuit 101 can be connected to the corresponding positive and negative output terminals through the positive charging relay K11 and the negative charging relay K12. During charging, the positive charging relay K11 and the negative charging relay K12 are closed, and when not charging, the positive charging relay K11 and the negative charging relay K12 are open.

[0095] In some embodiments, the external energy device 103 may include, but is not limited to, a charging pile, and the positive and negative output terminals may be the charging gun of the charging pile. The battery 100 may be the vehicle's battery, and the charging gun may be connected to the first energy storage circuit 102 and the first connection point P1 / second connection point P2 through the vehicle's charging port.

[0096] like Figure 3 As shown, in some other embodiments, the first terminal of the external energy device 103 can also be connected to the second connection point P2, that is, connected to the negative terminal of the battery 100. The first terminal of the external energy device 103 can be the negative output terminal, and the second terminal can be the positive output terminal.

[0097] When the second connection point P2 and the third connection point P3 are connected through a switching element, the first end of the first energy storage circuit 102 can be connected in series with the external energy device 103 through the first switching circuit 101, thereby enabling the external energy device 103 to charge the first energy storage circuit 102.

[0098] When the first connection point P1 and the third connection point P3 are connected through a switching element, the first end of the first energy storage circuit is connected to the positive terminal of the battery 100 through the first switching circuit 101, the second end of the external energy device 103 is connected to the second end of the first energy storage circuit 102, and the first end of the external energy device 103 is connected to the negative terminal of the battery 100, so that the external energy device 103, the first energy storage circuit 102 and the battery 100 are connected in series. The voltage of the external energy device 103 and the first energy storage circuit 102 after being connected in series increases, and they discharge together to the battery 100, which plays the role of boosting and charging the battery 100.

[0099] In some embodiments, the charging control method may further include: repeatedly performing N1 operations of the external energy device 103 charging the first energy storage circuit 102 and the external energy device 103 and the first energy storage circuit 102 jointly charging the battery 100, where N1 is an integer greater than 1. This enables continuous energy transfer to the battery 100 through the first energy storage circuit 102 and the external energy device 103, thereby improving charging efficiency.

[0100] In other words, the steps of external energy device 103 charging the first energy storage circuit 102 and external energy device 103 and first energy storage circuit 102 charging the battery 100 are alternately repeated N1 times.

[0101] It is understandable that after the first energy storage circuit 102 stores energy through the external energy device 103, its voltage rises. After the first energy storage circuit 102 discharges, its voltage decreases. In order to maintain the boost charging of the battery 100, the operation of the external energy device 103 charging the first energy storage circuit 102 and the operation of the external energy device 103 and the first energy storage circuit 102 jointly charging the battery 100 are repeated N1 times, so that the external energy device 103 can replenish the energy of the first energy storage circuit 102 and keep the voltage across the first energy storage circuit 102 high.

[0102] The value of N1 can be determined based on the capacity of the battery 100 and the capacity of the first energy storage circuit 102. In some embodiments, experiments can be conducted in advance, repeatedly performing the operation of the external energy device 103 charging the first energy storage circuit 102 and the operation of the external energy device 103 and the first energy storage circuit 102 jointly charging the battery 100 until the battery 100 is fully charged. The number of times this operation is repeated can be used as the value of N1.

[0103] In some embodiments, the above method can be executed by a controller. The controller can control the first switching circuit 101 and the external energy device 103 according to pre-stored instructions to execute the above method. The controller may include, but is not limited to, the MCU (Microcontroller Unit) of the vehicle, or the controller in the BMS (Battery Management System) of the battery 100.

[0104] In some embodiments, the controller is a controller in a BMS, and the external energy device 103 is a charging pile. The controller can send a charging message to the charging pile. After receiving the message, the charging pile controls the positive charging relay K11 and the negative charging relay K12 to close and outputs a charging voltage. At the same time, the controller controls the first switching circuit 101 according to a preset instruction, so that the first energy storage circuit 102 forms a loop with the external energy device 103 through the first switching circuit 101. The external energy device 103 charges the first energy storage circuit 102, and the first energy storage circuit 102, the external energy device 103, and the battery 100 form a loop. The external energy device 103 and the first energy storage circuit 102 together charge the battery 100.

[0105] In the above technical solution, since the external energy device 103 charges the first energy storage circuit 102, the first energy storage circuit 102 stores energy. After the external energy device 103 and the first energy storage circuit 102 form a loop, the external energy device 103 and the first energy storage circuit 102 are connected in series, and the voltage after the series connection is higher than the output voltage of the external energy device 103. Thus, by controlling the external energy device 103 and the first energy storage circuit 102 to charge the battery 100 together, boost charging of the battery 100 can be achieved, improving the charging efficiency of the battery 100.

[0106] like Figure 4 and Figure 5 As shown, according to some embodiments of this application, a voltage regulator circuit 104 is connected in parallel between the first and second terminals of the external energy device 103. The voltage regulator circuit 104 includes a first capacitor C1. Through the first switching circuit 101, the method further includes:

[0107] Step 110: The battery 100 charges the first capacitor C1 through the first switching circuit 101 and the first energy storage circuit 102.

[0108] Step 120: The external energy device 103 charges the first energy storage circuit 102, and the external energy device 103 and the first energy storage circuit 102 jointly charge the battery 100.

[0109] Step 110 is performed before step 120.

[0110] The first end of the voltage regulator circuit 104 can be connected to the second end of the first energy storage circuit 102, and the second end of the voltage regulator circuit 104 can be connected to the first connection point P1 or the second connection point P2 of the first switching circuit 101, so that the voltage regulator circuit 104 can be connected in parallel to the two ends of the external energy device 103.

[0111] In step 110, when the second terminal of the voltage regulator circuit 104 is connected to the first connection point P1, the third connection point P3 and the second connection point P2 can be controlled to conduct through the switching element. In this way, the second terminal of the voltage regulator circuit 104 is connected to the positive terminal of the battery 100, the first terminal of the voltage regulator circuit 104 is connected to the second terminal of the first energy storage circuit 102, and the first terminal of the first energy storage circuit 102 is connected to the negative terminal of the battery 100, so that the battery 100, the first energy storage circuit 102 and the voltage regulator circuit 104 form a circuit, thereby enabling the battery 100 to charge the first capacitor C1.

[0112] When the first terminal of the external energy device 103 is connected to the first connection point P1, the second terminal of the voltage regulator circuit 104 is connected to the first connection point P1, so that the voltage regulator circuit 104 can be connected in parallel to both ends of the external energy device.

[0113] When the first terminal of the external energy device 103 is connected to the second connection point P2, the second terminal of the voltage regulator circuit 104 is connected to the second connection point P2, so that the voltage regulator circuit 104 can be connected in parallel to both ends of the external energy device. As an example, Figure 4 The diagram shows the structure where the second terminal of the voltage regulator circuit 104 is connected to the second connection point P2.

[0114] With the second terminal of the voltage regulator circuit 104 connected to the second connection point P2, the third connection point P3 and the first connection point P1 can be controlled to conduct through the switching element. In this way, the first terminal of the first energy storage circuit 102 is connected to the positive terminal of the battery 100, the second terminal is connected to the first terminal of the voltage regulator circuit 104, the second terminal of the voltage regulator circuit 104 is connected to the negative terminal of the battery 100, and the first terminal of the first energy storage circuit 102 is connected to the negative terminal of the battery 100, so that the battery 100, the first energy storage circuit 102 and the voltage regulator circuit 104 form a loop, thereby enabling the battery 100 to charge the first capacitor C1.

[0115] After the first capacitor C1 is charged, it can reduce the ripple voltage output by the energy device 103, improve stability, and filter out high-frequency noise and interference.

[0116] In the above technical solution, the first energy storage circuit 102 can also charge the first capacitor C1, so that the first capacitor C1 can play a voltage stabilizing role during the charging of the battery 100 by the external energy device 103, thereby further improving the charging efficiency of the battery 100.

[0117] like Figure 6 As shown, according to some embodiments of this application, the method further includes:

[0118] Step 1101: Obtain the temperature of battery 100;

[0119] Step 1102: In response to the temperature of the battery 100 being greater than or equal to a preset temperature threshold, the first switching circuit 101 performs the following actions: the external energy device 103 charges the first energy storage circuit 102 and the external energy device 103 and the first energy storage circuit 102 jointly charge the battery 100.

[0120] Step 1103: In response to the temperature of the battery 100 being lower than a preset temperature threshold, the battery 100 is heated by the first switching circuit 101, the second switching circuit 105, and the first energy storage circuit 102.

[0121] In other words, the switching between steps 1102 and 1103 is based on the temperature of battery 100. When the temperature of battery 100 is low, the charging efficiency of battery 100 is low. Therefore, if the temperature of battery 100 is detected to be lower than a preset temperature threshold, step 1103 is executed. When the temperature of battery 100 is greater than or equal to the preset temperature threshold, step 1102 is executed again until battery 100 is fully charged.

[0122] During step 1103, the external energy device 103 can be controlled to disconnect from the first energy storage circuit 102 and the first switching circuit 101. During step 1101, the external energy device 103 can be controlled to connect to the first energy storage circuit 102 and the first switching circuit 101. During step 1102, the second switching circuit 105 can be controlled to disconnect. During step 1103, the second switching circuit 105 can be controlled to turn on.

[0123] In step 1101, obtaining the temperature of battery 100 may include obtaining the temperatures of the first battery pack 11 and the second battery pack 12. The temperature of battery 100 can be obtained using a temperature sensor. In some embodiments, the temperature sensor is communicatively connected to the BMS, and the controller in the BMS can receive the temperature information of the first battery pack 11 and the second battery pack 12 detected by the temperature sensor.

[0124] In step 1102, the response to the temperature of battery 100 being greater than or equal to a preset temperature threshold can be the response to the temperature of the first battery pack 11 and the second battery pack 12 being greater than or equal to a preset temperature threshold. Step 1102 can be executed by a controller. In step 1102, the operation of external energy device 103 charging the first energy storage circuit 102 and external energy device 103 and the first energy storage circuit 102 jointly charging battery 100 can be repeated multiple times to improve charging efficiency.

[0125] In step 1103, the response that the temperature of battery 100 is less than a preset temperature threshold can be the response that the temperature of at least one of the first battery pack 11 and the second battery pack 12 is less than the preset temperature threshold. Step 1103 can be executed by the controller.

[0126] In some embodiments, the negative terminal of the first battery pack 11 is connected to the positive terminal of the second battery pack 12, the first connection point P1 of the first switching circuit 101 is connected to the positive terminal of the first battery pack 11, the second connection point P2 is connected to the negative terminal of the second battery pack 12, and the second terminal of the second switching circuit 105 is connected to the negative terminal of the first battery pack 11 and the positive terminal of the second battery pack 12.

[0127] The first terminal of the second switching circuit 105 is connected to the second terminal of the first energy storage circuit 102. The second terminal of the second switching circuit 105 is connected to the midpoint between the first battery pack 11 and the second battery pack 12. The first switching circuit 101 is connected to the positive and negative terminals of the battery 100. That is, when the first connection point P1 and the third connection point P3 of the first switching circuit 101 are connected, the first switching circuit 101, the second switching circuit 105, and the first energy storage circuit 102 can form a circuit with the first battery pack 11. When the second connection point P2 and the third connection point P3 of the first switching circuit 101 are connected, the first switching circuit 101, the second switching circuit 105, and the first energy storage circuit 102 can form a circuit with the second battery pack 12. This allows the first battery pack 11 or the second battery pack 12 to release energy to the first energy storage circuit 102 through the corresponding circuit when the temperature of either the first battery pack 11 or the second battery pack 12 is lower than a preset temperature threshold. During the energy release process, heat is generated, which can then be used for heating.

[0128] In some embodiments, step 1102 may further include: before the external energy device charges the first energy storage circuit and the external energy device and the first energy storage circuit jointly charge the battery, the first switching circuit and the first energy storage circuit control the battery to charge the first capacitor.

[0129] like Figure 7As shown, in some embodiments, where the first terminal of the voltage regulator circuit 104 is connected to the second terminal of the first energy storage circuit 102, and the second terminal of the voltage regulator circuit 104 can be connected to the first connection point P1 or the second connection point P2 of the first switching circuit 101, the voltage regulator circuit 104 may further include a first switch V1, which is connected in series with the first capacitor C1 to control the on / off state of the voltage regulator circuit 104. During step 1102, the first switch V1 can be closed, so that the voltage regulator circuit 104 is connected in parallel across the external energy device 103 to achieve voltage regulation. During step 1103, the first switch V1 can be opened to avoid affecting the current flow direction during battery heating, thereby avoiding affecting the heating step of the battery 100.

[0130] In the above technical solution, if the temperature of the battery 100 is low during charging, the battery 100 can be heated to increase its temperature. Charging after the temperature rises further improves the charging efficiency of the battery 100. Furthermore, the first energy storage circuit 102 not only enables boost charging of the battery 100 but also heats it, significantly improving the charging efficiency of the battery 100 while maintaining a simple circuit structure and reducing costs.

[0131] like Figure 8 As shown, according to some embodiments of this application, step 1103 includes:

[0132] Step 11031: In response to the temperature of the battery 100 being lower than a preset temperature threshold, the battery 100 is controlled to be in the first heating stage through the first switching circuit 101, the second switching circuit 105 and the first energy storage circuit 102.

[0133] The first heating stage includes: repeatedly performing the operation of the first battery pack 11 charging the first energy storage circuit 102 and the first energy storage circuit 102 charging the second battery pack 12 N2 times through the first switching circuit 101 and the second switching circuit 105; N2 is an integer greater than or equal to 1.

[0134] In some embodiments, the value of N2 can be set according to the value of a preset temperature threshold and the type of battery 100. The operation of the first battery pack 11 charging the first energy storage circuit 102 and the first energy storage circuit 102 charging the second battery pack 12 can be performed multiple times in advance until the temperature of the first battery pack 11 and the second battery pack 12 is greater than or equal to the preset temperature threshold. The number of times this is performed is used as the value of N2.

[0135] In the first heating stage, the first connection point P1 and the third connection point P3 are connected, and the first battery pack 11 forms a circuit through the first switching circuit 101, the second switching circuit 105, and the first energy storage circuit 102, so that the first battery pack 11 charges the first energy storage circuit 102, and the first energy storage circuit 102 stores energy. Afterwards, the second connection point P2 and the third connection point P3 are connected, and the second battery pack 12 forms a circuit through the first switching circuit 101, the second switching circuit 105, and the first energy storage circuit 102, so that the first energy storage circuit 102 releases the stored energy to charge the second battery pack 12. Thus, during the first heating stage, current flows between the first battery pack 11 and the second battery pack 12, thereby heating both the first battery pack 11 and the second battery pack 12. Repeating the above process allows the first battery pack 11 to maintain a longer discharge time and the second battery pack 12 to maintain a longer charging time. Furthermore, compared to performing the above process only once, repeating the above process can reduce the rate of change of current flowing through the first energy storage circuit 102, thereby reducing the current frequency, reducing current ripple, improving the problem of high-frequency whistling in the battery heating circuit, and achieving low-frequency heating of the battery 100 to improve the heating efficiency of the battery 100.

[0136] Furthermore, such as Figure 9 As shown, Figure 9 The diagram shows the waveform of the current through the first energy storage circuit 102 when the first battery pack 11 charges the first energy storage circuit 102 and the first energy storage circuit 102 charges the second battery pack 12 repeatedly during the first heating phase T1.

[0137] like Figure 9 As shown, during the charging of the first energy storage circuit 102 by the first battery pack 11, the current in the first energy storage circuit 102 gradually increases from 0 to a positive first current I. up When the first energy storage circuit 102 is charging the second battery pack 12, the direction of current flow through the first energy storage circuit 102 remains unchanged. However, because the first energy storage circuit 102 releases energy, the current in the first energy storage circuit 102 changes from the positive first current I. up The second current I gradually decreases to a positive value. down .

[0138] The current in the first energy storage circuit 102 decreases to a positive second current I. down At any given time, the above process is repeated, that is, the first battery pack 11 charges the first energy storage circuit 102 again, causing the current in the first energy storage circuit 102 to rise to I again. up This ensures that the current in the first energy storage circuit 102 is at a positive first current I. up and the positive second current I downThe current alternates between these states until the first heating stage ends, at which point the current in the first energy storage circuit 102 becomes 0.

[0139] Figure 10 The diagram shows the waveform of the current through the first energy storage circuit 102 when the first heating phase T1 alternately performs the charging of the first energy storage circuit 102 by the first battery pack 11 and the charging of the second battery pack 12 by the first energy storage circuit 102.

[0140] like Figure 10 As shown, during the charging of the first energy storage circuit 102 by the first battery pack 11, the current in the first energy storage circuit 102 gradually increases from 0 to a positive first current I. up When the first energy storage circuit 102 is charging the second battery pack 12, the current in the first energy storage circuit 102 changes from a positive first current I. up As the first energy storage circuit 102 is charged by the first battery pack 11 only once during the first heating phase, the first energy storage circuit 102 will continue to release energy until the current in the first energy storage circuit 102 decreases to 0.

[0141] As can be seen from the above, in Figure 9 In the case shown, during the first heating stage, the current through the first energy storage circuit 102 is a positive first current I. up and the positive second current I down The changes between them, and Figure 10 In the case shown, during the first heating stage, the current through the first energy storage circuit 102 is a positive first current I. up It varies between 0 and 0. That is, Figure 9 In the case shown, the rate of change of current through the first energy storage circuit 102 is much smaller than Figure 10 The rate of change of the current through the first energy storage circuit 102 in the case shown reduces the frequency of the current.

[0142] The above technical solution can not only reduce the frequency of the current flowing through the first energy storage circuit 102 in the first heating stage and reduce the current ripple, but also make the first heating stage last for a longer time, thereby improving the heating efficiency of the battery 100 and charging the battery 100 more efficiently.

[0143] like Figure 11 As shown, according to some embodiments of this application, step 1103 includes:

[0144] Step 11032: In response to the temperature of battery 100 being lower than a preset temperature threshold, the battery 100 is controlled to alternately enter the first heating stage and the second heating stage through the first switching circuit 101 and the second switching circuit 105 until the temperature of battery 100 is greater than or equal to the preset temperature threshold.

[0145] The first heating stage includes: repeatedly performing the operation of the first battery pack 11 charging the first energy storage circuit 102 and the first energy storage circuit 102 charging the second battery pack 12 N2 times through the first switch circuit 101 and the second switch circuit 105, where N2 is an integer greater than or equal to 1.

[0146] The second heating stage includes: repeatedly performing the operation of the second battery pack 12 charging the first energy storage circuit 102 and the first energy storage circuit 102 charging the first battery pack 11 N3 times through the first switch circuit 101 and the second switch circuit 105, where N3 is an integer greater than or equal to 1.

[0147] The values ​​of N2 and N3 can be the same or different. The values ​​of N2 and N3 can be set according to the preset temperature threshold and the type of battery 100. The operation of the first battery pack 11 charging the first energy storage circuit 102 and the first energy storage circuit 102 charging the second battery pack 12, as well as the operation of the second battery pack 12 charging the first energy storage circuit 102 and the first energy storage circuit 102 charging the first battery pack 11, can be performed multiple times in advance until the temperature of the first battery pack 11 and the second battery pack 12 are both greater than or equal to the preset temperature threshold. At this time, the number of times the first heating stage is performed and the number of times the second heating stage is performed can be used as the number of times N2 and N3 are respectively.

[0148] In some embodiments, the battery 100 may be controlled to be in a second heating stage in response to the temperature of one of the first battery pack 11 and the second battery pack 12 being lower than a preset temperature threshold.

[0149] In other embodiments, the battery 100 may be controlled to be in a second heating stage in response to the fact that the temperatures of the first battery pack 11 and the second battery pack 12 are both lower than a preset temperature threshold.

[0150] In the second heating stage, the second battery pack 12 charges the first energy storage circuit 102 to store energy. Subsequently, the first energy storage circuit 102 releases the stored energy to charge the first battery pack 11. Repeating the above process reduces the rate of change of current flowing through the first energy storage circuit 102, thereby reducing the current frequency and achieving low-frequency heating of the battery 100. The reason is as described above in the relevant description of the first heating stage, and will not be repeated below.

[0151] In the above technical solution, since the first heating stage and the second heating stage are carried out alternately, the first battery pack 11 and the second battery pack 12 exchange energy. After the heating is completed, the energy balance of the first battery pack 11 and the second battery pack 12 can be maintained, the stability of the battery 100 can be maintained, and the charging efficiency of the battery 100 can be further improved when the battery 100 is recharged after the heating is completed.

[0152] like Figure 12 As shown, according to some embodiments of this application, a second energy storage circuit 106 is also connected in parallel across the two ends of the battery 100. The first end of the second energy storage circuit 106 is connected to the positive terminal of the battery 100, and the second end of the second energy storage circuit 106 is connected to the negative terminal of the battery 100. The first heating stage also includes: repeatedly performing the operation of the first battery pack 11 charging the second energy storage circuit 106 and the second energy storage circuit 106 charging the second battery pack 12 N4 times through the first switch circuit 101 and the second switch circuit 105, where N4 is an integer greater than or equal to 1.

[0153] The second energy storage circuit 106 is connected in parallel across the two ends of the battery 100, and the first switching circuit 101 is also connected in parallel across the two ends of the battery 100. That is, the second energy storage circuit 106 is connected in parallel with the first switching circuit 101, and the first switching circuit 101 is connected to the first energy storage circuit 102. This allows the second energy storage circuit 106 to be connected to the midpoint of the first battery pack 11 and the second battery pack 12 through the first switching circuit 101, the second switching circuit 105, and the first energy storage circuit 102, thereby enabling the repeated operation of the first battery pack 11 charging the second energy storage circuit 106 and the second energy storage circuit 106 charging the second battery pack 12 N4 times. The value of N4 can be the same as or different from the value of N2.

[0154] During the first heating stage, the first battery pack 11 can form a circuit with the second energy storage circuit 106 through the first switching circuit 101, the second switching circuit 105, and the first energy storage circuit 102, so that the first battery pack 11 charges the second energy storage circuit 106, and the second energy storage circuit 106 stores energy. The second battery pack 12 can also form a circuit with the second energy storage circuit 106 through the first switching circuit 101, the second switching circuit 105, and the first energy storage circuit 102, so that the second energy storage circuit 106 releases energy to charge the second battery pack 12.

[0155] In some embodiments, during the first heating stage, the first battery pack 11 can simultaneously charge the first energy storage circuit 102 and the second energy storage circuit 106, and the first energy storage circuit 102 can simultaneously charge the second battery pack 12 and the second energy storage circuit 106 can simultaneously charge the second battery pack 12.

[0156] The second energy storage circuit 106 may include, but is not limited to, components with charging and discharging functions such as inductors or capacitors.

[0157] For example, the first switching circuit 101 may include a bridge arm 23, which includes an upper bridge arm and a lower bridge arm. The upper bridge arm is connected to a first connection point P1, the lower bridge arm is connected to a second connection point P2, and the node between the upper and lower bridge arms serves as a third connection point P3. The first energy storage circuit 102 and the second energy storage circuit 106 may both include inductors.

[0158] During the first heating stage, the second switching circuit 105 is turned on, and the operation of turning on the lower bridge arm and the operation of turning on the upper bridge arm are alternately repeated.

[0159] During the conduction of the lower bridge arm, the first battery pack 11, the second energy storage circuit 106, the lower bridge arm, the first energy storage circuit 102, and the second switching circuit 105 form a loop. Current flows out from the positive terminal of the first battery pack 11, flows through the second energy storage circuit 106, the lower bridge arm, the first energy storage circuit 102, and the second switching circuit 105 in sequence, and then flows back to the negative terminal of the first battery pack 11, so that the first battery pack 11 simultaneously charges the first energy storage circuit 102 and the second energy storage circuit 106.

[0160] During the conduction of the upper bridge arm, the second energy storage circuit 106, the upper bridge arm, the first energy storage circuit 102, the second switching circuit 105, and the second battery pack 12 form a loop. The second energy storage circuit 106 and the first energy storage circuit 102 release energy to the second battery pack 12. Current flows from the second energy storage circuit 106 and the first energy storage circuit 102 to the positive terminal of the second battery pack 12 and flows out from the negative terminal of the second battery pack 12, so that the second energy storage circuit 106 and the first energy storage circuit 102 simultaneously charge the second battery pack 12.

[0161] It is understood that in some other embodiments, during the first heating stage, the charging of the first energy storage circuit 102 by the first battery pack 11 and the charging of the second energy storage circuit 106 by the first battery pack 11 may not be performed simultaneously, and the charging of the second battery pack 12 by the first energy storage circuit 102 and the charging of the second battery pack 12 by the second energy storage circuit 106 may also not be performed simultaneously.

[0162] In the above technical solution, the second energy storage circuit 106 can also realize the energy transfer from the first battery pack 11 to the second battery pack 12, further improving the heating efficiency of the battery.

[0163] like Figure 12As shown, according to some embodiments of this application, the first heating stage further includes: simultaneously charging the first energy storage circuit 102 with the first battery pack 11 and charging the second energy storage circuit 106 with the second battery pack 12 through the first switching circuit 101 and the second switching circuit 105, and simultaneously charging the second battery pack 12 with the first energy storage circuit 102 and charging the second energy storage circuit 106 with the first battery pack 11 through the first switching circuit 101 and the second switching circuit 105.

[0164] In other words, while the first battery pack 11 is charging the first energy storage circuit 102 by forming a loop with the first switch circuit 101 and the second switch circuit 105, the second energy storage circuit 106 can also form a loop with the second battery pack 12 by forming a loop with the first switch circuit 101 and the second switch circuit 105, thereby charging the second battery pack 12 and allowing current to flow through the second battery pack 12.

[0165] While the first energy storage circuit 102 is charging the second battery pack 12, it forms a circuit with the second battery pack 12 through the first switch circuit 101 and the second switch circuit 105. At the same time, the second energy storage circuit 106 is able to form a circuit with the first battery pack 11 through the first switch circuit 101 and the second switch circuit 105, so that the first battery pack 11 charges the second energy storage circuit 106, thereby allowing current to flow through the first battery pack 11.

[0166] In the above technical solution, during the first heating stage, the first energy storage circuit 102 and the second energy storage circuit 106 ensure that current always flows 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. This improves the heating efficiency of the battery 100 and makes the performance of the first battery pack 11 and the second battery pack 12 more stable.

[0167] like Figure 12 As shown, according to some embodiments of this application, when step 1103 includes step 11032, a second energy storage circuit 106 is also connected in parallel across the two ends of the battery 100, wherein the first end of the second energy storage circuit 106 is connected to the positive terminal of the battery 100, and the second end of the second energy storage circuit 106 is connected to the negative terminal of the battery 100.

[0168] The first heating stage further includes: repeatedly performing the operation of the first battery pack 11 charging the second energy storage circuit 106 and the second energy storage circuit 106 charging the second battery pack 12 N4 times through the first switching circuit 101 and the second switching circuit 105, where N4 is an integer greater than or equal to 1; and / or, the second heating stage further includes: performing the operation of the second battery pack 12 charging the second energy storage circuit 106 and the second energy storage circuit 106 charging the first battery pack 11 N5 times through the first switching circuit 101 and the second switching circuit 105, where N5 is an integer greater than or equal to 1.

[0169] The first heating stage also includes: the method of repeatedly performing the operation of charging the second energy storage circuit 106 by the first switch circuit 101 and the second switch circuit 105 for N4 times can be referred to the relevant description in the above embodiments, and will not be repeated below.

[0170] In some embodiments, during the second heating stage, the second battery pack 12 can simultaneously charge the first energy storage circuit 102 and the second energy storage circuit 106, and the first energy storage circuit 102 can simultaneously charge the first battery pack 11 and the second energy storage circuit 106 can simultaneously charge the first battery pack 11.

[0171] For example, the first switching circuit 101 may include a bridge arm 23, and both the first energy storage circuit 102 and the second energy storage circuit 106 include inductors.

[0172] During the second heating stage, the second switching circuit 105 is turned on, and the operation of turning on the upper bridge arm and the operation of turning on the lower bridge arm are alternately and repeatedly executed.

[0173] During the conduction of the upper bridge arm, the second battery pack 12, the second switching circuit 105, the first energy storage circuit 102, the upper bridge arm, and the second energy storage circuit 106 form a loop. Current flows out from the positive terminal of the second battery pack 12, flows through the second switching circuit 105, the first energy storage circuit 102, the upper bridge arm, and the second energy storage circuit 106 in sequence, and then flows back to the negative terminal of the second battery pack 12, so that the second battery pack 12 simultaneously charges the first energy storage circuit 102 and the second energy storage circuit 106.

[0174] During the conduction of the lower bridge arm, the first battery pack 11, the second switching circuit 105, the first energy storage circuit 102, the lower bridge arm, and the second energy storage circuit 106 form a loop. The first energy storage circuit 102 and the second energy storage circuit 106 release energy to the first battery pack 11. Current flows from the first energy storage circuit 102 and the second energy storage circuit 106 to the positive terminal of the first battery pack 11 and flows out from the negative terminal of the first battery pack 11, so that the first energy storage circuit 102 and the second energy storage circuit 106 simultaneously charge the first battery pack 11.

[0175] In other embodiments, during the second heating stage, the charging of the first energy storage circuit 102 by the second battery pack 12 and the charging of the second energy storage circuit 106 by the second battery pack 12 may not be performed simultaneously, and the charging of the first battery pack 11 by the first energy storage circuit 102 and the charging of the first battery pack 11 by the second energy storage circuit 106 may also not be performed simultaneously.

[0176] In the above technical solution, the second energy storage circuit 106 can also realize the energy transfer from the first battery pack 11 to the second battery pack 12, and / or the energy transfer from the second battery pack 12 to the first battery pack 11, while maintaining a relatively balanced energy between the first battery pack 11 and the second battery pack 12, and further improving the heating efficiency of the battery 100.

[0177] like Figure 13 As shown, according to some embodiments of this application, the first heating stage further includes: simultaneously charging the first energy storage circuit 102 with the first battery pack 11 and charging the second energy storage circuit 106 with the second battery pack 12 through the first switching circuit 101 and the second switching circuit 105, and simultaneously charging the first energy storage circuit 102 with the second battery pack 12 and charging the first battery pack 11 with the second energy storage circuit 106 through the first switching circuit 101 and the second switching circuit 105; and / or, the second heating stage further includes: simultaneously charging the first energy storage circuit 102 with the second battery pack 102 and charging the first battery pack 11 with the second energy storage circuit 106 through the first switching circuit 101 and the second switching circuit 105, and simultaneously charging the first energy storage circuit 102 with the first battery pack 11 and charging the second battery pack 12 with the second energy storage circuit 106 through the first switching circuit 101 and the second switching circuit 105.

[0178] In other words, during the first heating stage, current always flows through the first battery pack 11 and the second battery pack 12 through the second energy storage circuit 106.

[0179] During the second heating phase, while the second battery pack 12 is charging the first energy storage circuit 102 via the first switching circuit 101, the second switching circuit 105, and the first energy storage circuit 102, the second energy storage circuit 106 can also be charging the first battery pack 11 via the first switching circuit 101 and the second switching circuit 105, thus allowing current to flow through the first battery pack 11. Similarly, while the first battery pack 11 is charging the first energy storage circuit 102 via the first switching circuit 101, the second switching circuit 105, and the first energy storage circuit 102, the second battery pack 12 can also be charging the second energy storage circuit 106 via the first switching circuit 101 and the second switching circuit 105, thus allowing current to flow through the second battery pack 12. This ensures that current continuously flows through both the first battery pack 11 and the second battery pack 12 during the second heating phase.

[0180] In some embodiments, the first energy storage circuit 102 may include at least one inductor, and the second energy storage circuit 106 may include a second capacitor C2.

[0181] For example, the first energy storage circuit 102 may include a plurality of inductors, which may be connected in parallel or in series, or some of the inductors may be connected in parallel and then connected in series with the remaining inductors.

[0182] Both the inductor and the second capacitor C2 have charging and discharging functions, enabling the following simultaneous actions during the first heating stage: the first battery pack 11 charges the inductor and the second capacitor C2 charges the second battery pack 12 via the first switching circuit 101 and the second switching circuit 105; and the inductor charges the second battery pack 12 and the first battery pack 11 charges the second capacitor C2 via the first switching circuit 101 and the second switching circuit 105. Furthermore, during the second heating stage, the following simultaneous actions are also enabled: the second battery pack 12 charges the inductor and the second capacitor C2 charges the first battery pack 11 via the first switching circuit 101 and the second switching circuit 105; and the inductor charges the first battery pack 11 and the second battery pack 12 charges the second capacitor C2 via the first switching circuit 101 and the second switching circuit 105.

[0183] like Figure 14As shown, the second capacitor C2 is connected in parallel across the two ends of the battery 100. The first battery pack 11 forms a circuit with the first switch circuit 101, the second switch circuit 105, and the inductor. During the charging of the inductor, the second capacitor C2 can act as a substitute power source. Since the first switch circuit 101, the second switch circuit 105, and the inductor are connected, the second capacitor C2 can form a circuit with the second battery pack 12 through the first switch circuit 101, the second switch circuit 105, and the inductor. The current in this circuit charges the second battery pack 12 because it flows in the direction of the current in the first switch circuit 101, the second switch circuit 105, and the inductor. Figure 14 The solid line with arrows shows the current path for the first battery pack 11 to charge the inductor, and the dashed line with arrows shows the current path for the second capacitor C2 to charge the second battery pack 12.

[0184] like Figure 15 As shown, the second battery pack 12 forms a circuit through the first switch circuit 101, the second switch circuit 105, and the inductor, so that during the charging of the second battery pack 12 by the inductor, since the first switch circuit 101, the second switch circuit 105, and the inductor are connected, the second capacitor C2 can form a circuit with the first battery pack 11 through the first switch circuit 101, the second switch circuit 105, and the inductor, and the current in this circuit, due to the current flow in the first switch circuit 101, the second switch circuit 105, and the inductor, causes the first battery pack 11 to charge the second capacitor C2. Figure 15 The solid line with arrows shows the current path of the inductor charging the second battery pack 12, and the dashed line with arrows shows the current path of the first battery pack 11 charging the second capacitor C2.

[0185] Similarly, when the battery 100 is in the second heating stage, the first switch circuit 101 and the second switch circuit 105 can simultaneously charge the second battery pack 12 to the first energy storage circuit 102 and the second energy storage circuit 106 to the first battery pack 11, and the switch circuit can simultaneously charge the first energy storage circuit 102 to the first battery pack 11 and the second battery pack 12 to the second energy storage circuit 106. Figure 16 The solid line with arrows shows the current path for the second battery pack 12 to charge the inductor, and the dashed line with arrows shows the current path for the second capacitor C2 to charge the first battery pack 11. Figure 17 The solid line with arrows shows the current path for the inductor to charge the first battery pack 11, and the dashed line with arrows shows the current path for the second battery pack 12 to charge the second capacitor C2.

[0186] In some embodiments, when step 1103 includes step 11032, the inductance of the battery 100 satisfies the volt-second product balance when the battery 100 is in a heated state.

[0187] In the context of battery heating, the inductance satisfying the volt-second product balance means that, in the continuous first heating stage and the second heating stage, the volt-second product of the inductance in the first heating stage is equal to the volt-second product in the second heating stage.

[0188] The volt-second product refers to the voltage applied across the inductor multiplied by the conduction time. The volt-second product of the inductor in the first heating stage is the voltage applied across the inductor during the first heating stage multiplied by the duration of the first heating stage, and the volt-second product of the inductor in the second heating stage is the voltage applied across the inductor during the second heating stage multiplied by the duration of the second heating stage.

[0189] The volt-second product can be used to characterize the amount of energy transferred through inductance. When the volt-second product is balanced, the energy transferred through inductance in the first heating stage is the same as the energy transferred through inductance in the second heating stage, thereby maintaining the energy balance between the first battery pack 11 and the second battery pack 12.

[0190] In the above technical solution, during the first heating stage and / or the second heating stage, the first energy storage circuit 102 and the second energy storage circuit 106 ensure that current always flows 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. This improves the heating efficiency of the battery 100 and makes the performance of the first battery pack 11 and the battery pack more stable.

[0191] like Figures 18 to 21 As shown, according to some embodiments of this application, the first end of the external energy device 103 is connected to the second connection point P2, the first switching circuit 101 includes a bridge arm 23, the bridge arm 23 includes an upper bridge arm and a lower bridge arm connected in series, the upper bridge arm is connected to the first connection point P1, the lower bridge arm is connected to the second connection point P2, and the node between the upper bridge arm and the lower bridge arm serves as the third connection point P3.

[0192] Step 120 (or step 1102) may include: controlling the upper bridge arm and the second switch circuit 105 to turn off and the lower bridge arm to turn on, so as to execute the external energy device 103 to charge the first energy storage circuit 102; controlling the lower bridge arm and the second switch circuit 105 to turn off and the upper bridge arm to turn on, so as to execute the external energy device 103 and the first energy storage circuit 102 to charge the battery 100 together.

[0193] The upper bridge arm includes an upper bridge arm switch V3, and the lower bridge arm includes a lower bridge arm switch V4. Turning the upper bridge arm on / off via the upper bridge arm switch V3 enables the upper bridge arm to be turned on / off, and turning the lower bridge arm on / off via the lower bridge arm switch V4 enables the lower bridge arm to be turned on / off. The types of the upper bridge arm switch V3 and the lower bridge arm switch V4 include, but are not limited to, MOSFETs or IGBTs.

[0194] It is understood that the upper bridge arm switch V3 and the lower bridge arm switch V4 can be the switching elements in the above embodiments.

[0195] In one example, the first switching circuit 101 may include three bridge arms 23, and the first energy storage circuit 102 may include three first inductors L1 connected in parallel and a second inductor L2 connected in series with the first inductors L1 connected in parallel. The three first inductors L1 are connected to the three bridge arms 23 in a one-to-one correspondence. The first end of the second inductor L2 is connected to the first inductor L1, and the second end of the second inductor L2 is connected to the first end of the second switching circuit 105.

[0196] The second switching circuit 105 may include a second switch V2, which is used to control the on / off state of the second switching circuit 105. The second switch V2 may include, but is not limited to, a MOSFET or an IGBT.

[0197] The first end of the upper bridge arm is connected to the first connection point P1 to connect to the positive terminal of the battery 100, and the first end of the lower bridge arm is connected to the second connection point P2 to connect to the negative terminal of the battery 100. The second ends of the upper and lower bridge arms are connected, and the node between the upper and lower bridge arms is connected to the third connection point P3 to connect to the first terminal of the first energy storage circuit 102. The first terminal of the external energy device 103 is the negative output terminal, and the second terminal is the positive output terminal.

[0198] When the upper bridge arm is off and the lower bridge arm is on, the first connection point P1 and the third connection point P3 are disconnected, while the second connection point P2 and the third connection point P3 are on. This allows the external energy device 103 to connect to the first end of the first energy storage circuit 102 via the lower bridge arm, thereby forming a loop with the first energy storage circuit 102 to charge it. Figure 20 As shown, Figure 20 The solid line with arrows in the middle represents the current path through which the external energy device 103 charges the first energy storage circuit 102.

[0199] With the lower bridge arm off and the upper bridge arm on, the second connection point P2 and the third connection point P3 are disconnected, while the first connection point P1 and the third connection point P3 are on. The first terminal of the first energy storage circuit 102 is connected to the positive terminal of the battery 100 through the upper bridge arm, and the second terminal of the first energy storage circuit 102 is connected to the second terminal of the external energy device 103. The first terminal of the external energy device 103 is connected to the negative terminal of the battery 100, thus forming a circuit through the external energy device 103, the first energy storage circuit 102, and the battery 100, allowing the first energy storage circuit 102 and the external energy device 103 to jointly charge the battery 100. Figure 21 As shown, Figure 21 The solid line with the arrow in the middle represents the current path through which the external energy device 103 and the first energy storage circuit 102 charge the battery 100.

[0200] like Figures 18 to 21 As shown, the charging control circuit also includes a third switch K3 and a fourth switch K4. The first terminal of the first switch K1 is connected to the positive terminal of the battery 100, and the second terminal of the third switch K3 is connected to the upper bridge arm, used to control the connection / disconnection between the positive terminal of the battery 100 and the upper bridge arm. The first terminal of the fourth switch K4 is connected to the negative terminal of the battery 100, and the second terminal of the fourth switch K4 is connected to the lower bridge arm, used to control the connection / disconnection between the negative terminal of the battery 100 and the lower bridge arm. Thus, when the battery 100 needs to be heated, the connection between the battery 100 and the bridge arm 23 can be controlled via the third switch K3 and the fourth switch K4; when the battery 100 does not need to be heated, the connection between the battery 100 and the bridge arm 23 can be controlled via the third switch K3 and the fourth switch K4, thereby not affecting the normal performance of the battery 100.

[0201] In some embodiments, the third switch K3 can be connected to the upper bridge arm via the first connector 21, and the fourth switch K4 can be connected to the lower bridge arm via the second connector 22.

[0202] In some embodiments, the charging control circuit further includes a fifth switch K5 connected in parallel with the fourth switch K4 and a first resistor R1 connected in series to provide current limiting protection.

[0203] In some embodiments, the charging control circuit further includes a current sensor 20, which is connected between the battery 100 and the switching circuit 101. For example, it can be connected between the positive terminal of the battery 100 and the third switch to detect the current output by the battery 100, so as to facilitate the regulation of the current used in the charging control circuit.

[0204] In some embodiments, the third switch K3, the fourth switch K4, and the fifth switch K5 may include, but are not limited to, relays.

[0205] In the above technical solution, the external energy device 103 and the first energy storage circuit 102 can be used to boost the battery 100 by controlling the separate conduction of the upper and lower bridge arms, thus simplifying the control method for charging the battery 100.

[0206] It is understood that when the first end of the external energy device 103 is connected to the first connection point P1, the first end of the external energy device 103 is the positive output terminal, and the second end is the negative output terminal. Step 120 (or step 1102) may include: controlling the lower bridge arm to turn off and the upper bridge arm to turn on, so as to execute the external energy device 103 to charge the first energy storage circuit 102; controlling the lower bridge arm to turn on and the upper bridge arm to turn off, so as to execute the external energy device 103 and the first energy storage circuit 102 to charge the battery 100 together.

[0207] like Figure 19 As shown, according to some embodiments of this application, the first end of the external energy device 103 is connected to the second connection point P2, and a voltage regulator circuit 104 is connected in parallel between the first end and the second end of the external energy device 103. In the case that the voltage regulator circuit 104 includes a first capacitor C1, before executing step 120 (or executing step 1102), the method further includes: controlling the upper bridge arm to be turned on and the lower bridge arm to be turned off, so as to enable the battery 100 to charge the first capacitor C1.

[0208] The first terminal of the voltage regulator circuit 104 is connected to the second terminal of the first energy storage circuit 102, and the second terminal of the voltage regulator circuit 104 is connected to the second connection point P2.

[0209] During the period when the upper bridge arm is on and the lower bridge arm is off, the first terminal of the first energy storage circuit 102 is connected to the positive terminal of the battery 100 through the upper bridge arm, the first terminal of the voltage regulator circuit 104 is connected to the second terminal of the first energy storage circuit 102, and the second terminal of the voltage regulator circuit 104 is connected to the negative terminal of the battery 100 through the second connection point P2. This allows the battery 100 to form a circuit through the upper bridge arm, the first energy storage circuit 102, and the voltage regulator circuit 104, so that the battery 100 can charge the first capacitor C1.

[0210] In the above technical solution, by controlling the bridge arm 23, the first capacitor C1 can also be charged so that the first capacitor C1 plays a voltage stabilizing role during the charging of the battery 100 by the external energy device 103. This further improves the charging efficiency of the battery 100 and simplifies the control method for charging the battery 100.

[0211] It is understood that when the first end of the external energy device 103 is connected to the first connection point P1, before executing step 120 (or executing step 1102), the method further includes: controlling the lower bridge arm to be turned on and the lower bridge arm to be turned off, so as to enable the battery 100 to charge the first capacitor C1.

[0212] like Figures 22 to 23 As shown, according to some embodiments of this application, in step 1103, controlling the battery 100 to be in the first heating stage includes: sequentially and alternately executing the first step and the second step. The first step includes: controlling the upper bridge arm and the second switch circuit to be turned on, and the lower bridge arm to be turned off; the second step includes: controlling the lower bridge arm and the second switch circuit to be turned on, and the upper bridge arm to be turned off.

[0213] In other words, by setting up the first energy storage circuit 102, it is possible to boost the charging of the battery 100, transfer energy between the first battery pack 11 and the second battery pack 12, and charge the first capacitor C1. This can greatly improve the charging efficiency of the battery 100 while keeping the circuit structure relatively simple.

[0214] It is easy to see that during step 120 (or step 1102), the second switching circuit is turned off, preventing charging current from flowing through it and thus not affecting the boost charging of the battery by the first energy storage circuit 102 and the external energy device 103. During step 1103, the second switching circuit is closed, allowing the first battery pack 11 and the second battery pack 12 to form loops with the first energy storage circuit 102 through the second switching circuit 105, enabling energy exchange between them and achieving self-heating. In other words, the first and second switching circuits enable switching between the battery charging and heating states.

[0215] In some embodiments, the voltage regulator circuit 104 further includes a first switch connected in series with the first capacitor C1, which controls the first switch to close during the execution of steps 110 and 120 (or step 1102) and controls the first switch to open during the execution of step 1103.

[0216] In step 1103, the first step and the second step can be executed alternately and repeatedly to put the battery 100 into the first heating stage.

[0217] In some embodiments, the first energy storage circuit 102 includes at least one inductor. For example... Figure 22 As shown, the first step is executed first. The first battery pack 11, the upper bridge arm, the second switching circuit 105 and the inductor form a loop. The current flows from the positive terminal of the first battery pack 11 through the upper bridge arm, the inductor and the second switching circuit 105, and then flows back to the negative terminal of the first battery pack 11. The inductor stores energy. Figure 22 The solid line with arrows shows the current path for the first battery pack 11 to charge the inductor.

[0218] like Figure 23 As shown, the second step is then performed. The lower bridge arm, inductor, second switching circuit 105 and second battery pack 12 form a loop. The current flows from the inductor through the positive terminal of the second battery pack 12, the negative terminal of the second battery pack 12 and the lower bridge arm and then back to the inductor. That is, the inductor releases energy to the second battery pack 12. Figure 23 The solid line with arrows shows the current path for the inductor to charge the second battery pack 12.

[0219] In some embodiments, the upper bridge arm switch V3 is equipped with a first freewheeling diode D1, and the lower bridge arm switch V4 is equipped with a second freewheeling diode D2. During the transition from the first step to the second step, i.e., when the upper bridge arm switches from on to off, current can flow through the first freewheeling diode D1, ensuring a continuous current flow through the inductor during the transition. Similarly, during the transition from the second step to the first step, current can flow through the second freewheeling diode D2. Thus, throughout the entire first heating stage, current flows through the inductor, resulting in a smaller rate of change of current through the inductor and a lower frequency of current flowing through it. When there are multiple inductors, and these inductors form the motor windings in the motor, this significantly improves the problem of high-frequency whistling caused by excessive current flowing through the motor, maintaining stable motor performance and improving the heating efficiency of the battery 100.

[0220] In some embodiments, a second capacitor C2 is connected in parallel across the two ends of the battery 100.

[0221] like Figure 22 As shown, when the first step is performed, the upper bridge arm is turned on and the lower bridge arm is turned off. The second capacitor C2 forms a circuit with the second battery pack 12 through the upper bridge arm and the inductor to charge the second battery pack 12. Figure 22 The dashed line with arrows shows the current path through which the second capacitor C2 charges the second battery pack 12.

[0222] It is worth noting that, such as Figure 19 As shown, during the charging of the first capacitor C1 by the battery, the upper bridge arm is turned on and the lower bridge arm is turned off. The first battery pack 11 and the second battery pack 12 also charge the second capacitor C2. In this way, the second capacitor C2 can release energy to the second battery pack to charge the second battery pack during the execution of the first step.

[0223] like Figure 23 As shown, in the second step, the lower bridge arm is turned on and the upper bridge arm is turned off. The second capacitor C2 forms a circuit with the first battery pack 11 through the lower bridge arm and the inductor, so that the first battery pack 11 charges the inductor. Figure 23 The solid line with an arrow in the middle shows the current path of the first battery pack 11 charging the second capacitor C2.

[0224] In the above technical solution, the switching between heating and charging of battery 100 can be achieved by controlling bridge arm 23 and the second switching circuit, which further improves the charging efficiency of battery 100 and simplifies the charging control method.

[0225] like Figures 24 to 25As shown, according to some embodiments of this application, in the case of step 11032, the method of controlling the battery 100 to be in the second heating stage includes: sequentially and alternately performing the second step and the first step.

[0226] The first energy storage circuit 102 may include at least one inductor. For example... Figure 24 As shown, the second step is executed first. The second battery pack 12, the second switching circuit 105, the lower bridge arm and the inductor form a circuit. The current flows from the positive terminal of the second battery pack 12 through the lower bridge arm and the inductor and then flows back to the negative terminal of the second battery pack 12. The inductor stores energy. Figure 25 The solid line with arrows shows the current path for the second battery pack 12 to charge the inductor.

[0227] like Figure 25 As shown, the first step is then executed: the upper bridge arm is turned on and the lower bridge arm is turned off. The first energy storage circuit 102, the upper bridge arm, the first battery pack 11, and the second switching circuit 105 form a loop. The current flows from the inductor through the positive terminal of the first battery pack 11, the negative terminal of the first battery pack 11, and the upper bridge arm before flowing back to the inductor. In other words, the inductor releases energy to the first battery pack 11. Figure 24 The solid line with arrows shows the current path for the inductor to charge the first battery pack 11.

[0228] In some embodiments, a second capacitor C2 is connected in parallel across the two ends of the battery 100.

[0229] like Figure 24 As shown, in the second step, the second capacitor C2 forms a circuit with the first battery pack 11 through the lower bridge arm and the inductor to charge the first battery pack 11. Figure 24 The dashed line with arrows shows the current path through which the second capacitor C2 charges the first battery pack 11.

[0230] like Figure 25 As shown, in the first step, the second capacitor C2 forms a circuit with the second battery pack 12 through the upper bridge arm and the inductor, so that the second battery pack 12 charges the inductor. Figure 25 The dashed line with an arrow shows the current path for the second battery pack 12 to charge the second capacitor C2.

[0231] In some embodiments, the method for transitioning from the first heating stage to the second heating stage may include:

[0232] The first and second steps are executed alternately and repeatedly to put battery 100 into the first heating stage. In the last step of the second stage, the inductor continuously releases energy to the second battery pack 12 until all the energy in the inductor is released and the current flowing through the inductor is zero. The second step remains unchanged until the second battery pack 12 begins to charge the inductor. At this time, the current flows from the positive terminal of the second battery pack 12 to the inductor, and the current in the inductor begins to reverse, and battery 100 enters the second heating stage. After the inductor has stored all the energy, the first step is executed. The inductor, the first energy storage circuit 102, the upper bridge arm, and the first battery pack 11 form a loop, and the current flows from the inductor through the positive terminal of the first battery pack 11 to charge the first battery pack 11. Thus, the transition from the first heating stage to the second heating stage is completed.

[0233] The method for switching from the second heating stage to the first heating stage is the same as the method for switching from the first heating stage to the second heating stage. The only difference is that in the last step of the second heating stage, after the inductor energy is released, the first step remains unchanged, so that the current starts to reverse and the battery enters the first heating stage.

[0234] In some embodiments, the duration of the first heating phase and the second heating phase can be set according to different battery types and preset temperature threshold values. For example, the duration of the first heating phase and the second heating phase can be 1 second.

[0235] The above technical solution simplifies the control method while ensuring energy balance between the first battery pack 11 and the second battery pack 12 after heating, thus guaranteeing high charging efficiency when recharging the battery 100.

[0236] This application provides a charging control circuit. The battery includes a first battery pack and a second battery pack connected in series. The charging control circuit includes a first switching circuit 101, which includes a first connection point P1, a second connection point P2, and a third connection point P3 interconnected by switching elements. The first connection point P1 is connected to the positive terminal of the battery 100, and the second connection point P2 is connected to the negative terminal of the battery 100. The first connection point P1 or the second connection point P2 is also used to connect to the first terminal of an external energy device 103. A second switching circuit 105 is provided, and the first terminal of the second switching circuit 105 is connected to a first energy storage device. The second terminal of circuit 102 and the second terminal of the second switching circuit 105 are connected to the midpoint of the first battery pack 11 and the second battery pack 12; the first energy storage circuit 102 has its first terminal connected to the third connection point P3, and its second terminal is used to connect to the second terminal of the external energy device 103; the circuit also includes a controller configured to: through the first switching circuit 101, execute the external energy device 103 to charge the first energy storage circuit 102 and the external energy device 103 and the first energy storage circuit 102 to charge the battery 100 together.

[0237] The structure of the first switching circuit 101, the second switching circuit 105, the external energy device 103, and the first energy storage circuit 102, as well as their connection relationship with the battery 100, can be referred to the relevant descriptions in the above embodiments, and will not be repeated below.

[0238] The structure of the controller and the method by which the controller, through the first switching circuit 101, executes the charging of the first energy storage circuit 102 by the external energy device 103 and the charging of the battery 100 by the external energy device 103 and the first energy storage circuit 102 together can be referred to the relevant description in the above embodiments, and will not be repeated below.

[0239] In the above technical solution, the first energy storage circuit 102, the battery 100, and the external energy device 103 can be connected through the first switching circuit 101, so that the external energy device 103 can be connected in series with the first energy storage circuit 102 to charge the battery 100, thereby achieving boost charging of the battery 100. That is, boost charging of the battery 100 can be achieved simply by setting the first switching circuit 101 and the first energy storage circuit 102, simplifying the circuit and improving the charging efficiency of the battery 100.

[0240] According to some embodiments of this application, the charging control circuit further includes: a voltage regulator circuit 104, the voltage regulator circuit 104 including a first capacitor C1, a first terminal of the voltage regulator circuit 104 connected to a second terminal of the first energy storage circuit 102, and a second terminal of the voltage regulator circuit 104 connected to a first connection point P1 or a second connection point P2. The voltage regulator circuit 104 is used to be connected in parallel between the first terminal and the second terminal of the external energy device 103 during the charging of the battery 100 by the external energy device 103.

[0241] The structure and function of the voltage regulator circuit 104 can be found in the descriptions in the above embodiments, and will not be repeated hereafter.

[0242] In the above technical solution, the first energy storage circuit 102 can not only charge the battery 100, but also charge the first capacitor C1, so that the first capacitor C1 plays a voltage stabilizing role during the charging of the battery 100 by the external energy device 103, thereby further improving the charging efficiency of the battery 100.

[0243] According to some embodiments of this application, the controller is further configured to: acquire the temperature of the battery 100; in response to the temperature of the battery 100 being greater than or equal to a preset temperature threshold, execute, via the first switching circuit 101, the external energy device 103 charging the first energy storage circuit 102 and the external energy device 103 and the first energy storage circuit 102 jointly charging the battery 100; and in response to the temperature of the battery 100 being less than the preset temperature threshold, heat the battery 100 via the first switching circuit 101, the second switching circuit 105, and the first energy storage circuit 102.

[0244] That is, the controller can execute steps 1101, 1102, and 1103. The controller can pre-store the corresponding instructions to execute the above steps. The method and principle of the controller performing the above operations can be referred to the relevant description in the above embodiments, and will not be repeated below.

[0245] In the above technical solution, the second switching circuit 105 enables the first energy storage circuit 102 to also heat the battery 100. Without increasing the complexity of the circuit, it can switch to heating the battery 100 when the battery 100 temperature is low to increase the temperature of the battery 100. After the temperature rises, the battery 100 is charged to further improve the charging efficiency of the battery 100.

[0246] According to some embodiments of this application, the charging control circuit further includes a voltage regulator circuit 104, which includes: a first capacitor C1; a first switch, wherein the first switch and the first capacitor C1 are connected in series between the second terminal of the first energy storage circuit 102 and the first connection point P1 / second connection point P2, and the voltage regulator circuit 104 is used to be connected in parallel to the first and second terminals of the external energy device 103 during the charging of the battery 100 by the external energy device 103; wherein the controller is configured to: control the first switch to close in response to the temperature of the battery 100 being greater than or equal to a preset temperature threshold; and control the first switch to close in response to the temperature of the battery 100 being less than the preset temperature threshold.

[0247] The connection relationship between the first switch, the first capacitor C1, and the battery 100, as well as the control method of the first switch, can be found in the relevant descriptions in the above embodiments, and will not be repeated hereafter.

[0248] In the above technical solution, during the heating of the battery 100, the first switch is turned off, causing the voltage regulator circuit 104 to disconnect from the first energy storage circuit 102. This prevents the current flow in the heating circuit from being affected during the heating of the battery 100 through the first switch circuit 101, the second switch circuit 105, and the first energy storage circuit 102, and thus prevents any adverse effect on the heating of the battery 100.

[0249] According to some embodiments of this application, the controller is configured to: in response to the temperature of the battery 100 being lower than a preset temperature threshold, control the battery 100 to be in a first heating stage through the first switching circuit 101, the second switching circuit 105, and the first energy storage circuit 102 to heat the battery 100; wherein, the first heating stage includes: repeatedly performing the operation of the first battery pack 11 charging the first energy storage circuit 102 and the first energy storage circuit 102 charging the second battery pack 12 N2 times through the first switching circuit 101 and the second switching circuit 105, where N2 is an integer greater than or equal to 1.

[0250] The method and principle of controlling the battery 100 to be in the first heating stage through the first switching circuit 101, the second switching circuit 105 and the first energy storage circuit 102 can be referred to the relevant description in the above embodiments, and will not be repeated below.

[0251] The above technical solution can not only reduce the frequency of the current flowing through the first energy storage circuit 102 in the first heating stage and reduce the current ripple, but also make the first heating stage last for a longer time, thereby improving the heating efficiency of the battery 100 and charging the battery 100 more efficiently.

[0252] According to some embodiments of this application, the charging control circuit further includes: a second energy storage circuit 106, a first terminal of the second energy storage circuit 106 connected to the positive terminal of the battery 100, a second terminal of the second energy storage circuit 106 connected to the negative terminal of the battery 100, and the controller is further configured to: in the first heating stage, repeatedly perform the operation of the first battery pack 11 charging the second energy storage circuit 106 and the second energy storage circuit 106 charging the second battery pack 12 N4 times through the first switch circuit 101 and the second switch circuit 105, where N4 is an integer greater than or equal to 1.

[0253] The structure of the second energy storage circuit 106 and the method and principle of performing the above operations through the second energy storage circuit 106 can be referred to the relevant description in the above embodiments, and will not be repeated below.

[0254] In the above technical solution, the second energy storage circuit 106 can also realize the energy transfer from the first battery pack 11 to the second battery pack 12, further improving the heating efficiency of the battery 100.

[0255] According to some embodiments of this application, the controller is configured to: in a first heating phase, simultaneously execute the first battery pack 11 charging the first energy storage circuit 102 and the second energy storage circuit 106 charging the second battery pack 12 via the first switching circuit 101 and the second switching circuit 105; and in the first heating phase, simultaneously execute the first energy storage circuit 102 charging the second battery pack 12 and the first battery pack 11 charging the second energy storage circuit 106 via the first switching circuit 101 and the second switching circuit 105.

[0256] The methods and principles for performing the above operations through the first switching circuit 101, the second switching circuit 105, the first energy storage circuit 102, and the second energy storage circuit 106 can be found in the relevant descriptions in the above embodiments, and will not be repeated hereafter.

[0257] In the above technical solution, during the first heating stage, the first energy storage circuit 102 and the second energy storage circuit 106 ensure that current always flows 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. This improves the heating efficiency of the battery 100 and makes the performance of the first battery pack 11 and the second battery pack 12 more stable.

[0258] According to some embodiments of this application, the controller is configured to: in response to the temperature of the battery 100 being lower than a preset temperature threshold, control the battery 100 to alternately enter a first heating stage and a second heating stage via a first switching circuit 101 and a second switching circuit 105 to heat the battery 100; wherein, the first heating stage includes: repeatedly performing the operation of the first battery pack 11 charging the first energy storage circuit 102 and the first energy storage circuit 102 charging the second battery pack 12 N2 times via the first switching circuit 101 and the second switching circuit 105, where N2 is an integer greater than or equal to 1; the second heating stage includes: repeatedly performing the operation of the second battery pack 12 charging the first energy storage circuit 102 and the first energy storage circuit 102 charging the first battery pack 11 N3 times via the first switching circuit 101 and the second switching circuit 105, where N3 is an integer greater than or equal to 1.

[0259] The execution methods and principles of the above operations can be found in the relevant descriptions in the above embodiments, and will not be repeated below.

[0260] In the above technical solution, the second energy storage circuit 106 can also realize the energy transfer from the first battery pack 11 to the second battery pack 12, and / or the energy transfer from the second battery pack 12 to the first battery pack 11, further improving the heating efficiency of the battery 100.

[0261] According to some embodiments of this application, a second energy storage circuit 106 is also connected in parallel across the two ends of the battery 100. The first end of the second energy storage circuit 106 is connected to the positive terminal of the battery 100, and the second end of the second energy storage circuit 106 is connected to the negative terminal of the battery 100. The controller is further configured to: in the first heating stage, repeatedly perform the operation of charging the second energy storage circuit 106 by the first switch circuit 101 and the second switch circuit 105 for N4 times, where N4 is an integer greater than or equal to 1; and / or in the second heating stage, perform the operation of charging the second energy storage circuit 106 by the second energy storage circuit 106 and the second energy storage circuit 106 by the second switch circuit 101 and the second switch circuit 105 for N5 times, where N5 is an integer greater than or equal to 1.

[0262] The execution methods and principles of the above operations can be found in the relevant descriptions in the above embodiments, and will not be repeated below.

[0263] In the above technical solution, the second energy storage circuit 106 can also realize the energy transfer from the first battery pack 11 to the second battery pack 12, and / or the energy transfer from the second battery pack 12 to the first battery pack 11, further improving the heating efficiency of the battery 100.

[0264] According to some embodiments of this application, the controller is configured to: in a first heating phase, simultaneously execute the charging of the first battery pack 11 to the first energy storage circuit 102 and the charging of the second energy storage circuit 106 to the second battery pack 12 via the first switching circuit 101 and the second switching circuit 105, and simultaneously execute the charging of the first energy storage circuit 102 to the second battery pack 12 and the charging of the first battery pack 11 to the second energy storage circuit 106 via the first switching circuit 101 and the second switching circuit 105; and / or in a second heating phase, simultaneously execute the charging of the second battery pack 12 to the first energy storage circuit 102 and the charging of the second energy storage circuit 106 to the first battery pack 11 via the first switching circuit 101 and the second switching circuit 105, and simultaneously execute the charging of the first energy storage circuit 102 to the first battery pack 11 and the charging of the second battery pack 12 to the second energy storage circuit 106 via the first switching circuit 101 and the second switching circuit 105.

[0265] The execution methods and principles of the above operations can be found in the relevant descriptions in the above embodiments, and will not be repeated below.

[0266] In the above technical solution, during the first heating stage and / or the second heating stage, the first energy storage circuit 102 and the second energy storage circuit 106 ensure that current always flows 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. This improves the heating efficiency of the battery 100 and makes the performance of the first battery pack 11 and the battery pack more stable.

[0267] According to some embodiments of this application, the first energy storage circuit 102 includes at least one inductor, and the second energy storage circuit 106 includes a second capacitor C2.

[0268] In some embodiments, the first energy storage circuit 102 may include an inductor.

[0269] In other embodiments, the first energy storage circuit 102 may also include multiple inductors, which may be connected in parallel or in series, or some of the multiple inductors may be connected in parallel and then connected in series with the remaining inductors.

[0270] The principle and method by which the controller uses inductors and capacitors to put the battery 100 into the first heating stage and the second heating stage can be referred to the relevant descriptions above, and will not be repeated below.

[0271] In the above technical solution, the inductor has a better energy storage capacity than the capacitor, enabling higher energy transfer efficiency between the first battery pack 11 and the second battery pack 12. The capacitor is smaller than the inductor and can achieve rapid charging and discharging, ensuring that current always flows through the first battery pack 11 and the second battery pack 12 during the first heating stage. Ensuring that current always flows through the first battery pack 11 and the second battery pack 12 during the first and / or second heating stages helps maintain the stability of the current flowing through them. Simultaneously, it reduces the size and weight of the battery heating circuit, saving costs.

[0272] According to some embodiments of this application, the first switching circuit 101 includes a bridge arm 23, which includes an upper bridge arm and a lower bridge arm connected in series. The upper bridge arm is connected to a first connection point P1, the lower bridge arm is connected to a second connection point P2, and the node between the upper bridge arm and the lower bridge arm serves as a third connection point P3.

[0273] The method of charging the first energy storage circuit 102 by the external energy device 103 through the bridge arm 23, and charging the battery 100 by the external energy device 103 and the first energy storage circuit 102 together, as well as charging the first capacitor C1, and controlling the battery 100 to be in the first heating stage and the second heating stage, can be referred to the relevant description in the above embodiments, and will not be repeated below.

[0274] The structure of the bridge arm 23 can be referred to the relevant description in the above embodiments, and will not be repeated below.

[0275] In some embodiments, the first switching circuit 101 may include a plurality of parallel bridge arms 23, and the corresponding first energy storage circuit 102 includes a plurality of parallel inductors, each of which is connected to a corresponding parallel bridge arm 23. The parallel inductors can be motor windings in a motor, for example, three-phase motor windings. The parallel bridge arms 23 can be three-phase bridge arms in a motor. Thus, when heating the vehicle's battery 100, the existing motor in the vehicle can be used to heat the battery 100, reducing costs and keeping the vehicle's weight relatively low.

[0276] In the above technical solution, the external energy device 103 and the first energy storage circuit 102 can be used to boost the charging of the battery 100 by controlling only the upper and lower bridge arms, which simplifies the structure of the charging control circuit and the control method.

[0277] This application provides a battery system that includes the charging control circuit described in the above embodiments.

[0278] The battery system includes a battery 100, which is connected to a charging control circuit. The battery system has the beneficial effects of the charging control circuit provided in the embodiments of this application; for details, please refer to the specific descriptions of the charging control circuit in the above embodiments, which will not be repeated here.

[0279] This application provides an electrical device that includes the battery system described in the above embodiments, the battery system being used to provide electrical energy.

[0280] The electrical devices can be referred to the relevant descriptions in the above embodiments, and will not be repeated below.

[0281] The first switching circuit 101 may include three bridge arms 23. The first energy storage circuit 102 may include three parallel first inductors L1 and a second inductor L2 connected in series with the parallel first inductors L1. The three first inductors L1 are connected to the three bridge arms 23 in a one-to-one correspondence. The first end of the second inductor L2 is connected to the first inductor L1, and the second end of the second inductor L2 is connected to the first end of the second switching circuit 105. The second switching circuit 105 includes a second switch, which may include a MOSFET.

[0282] This application provides a battery charging control method. A battery 100 includes a first battery pack 11 and a second battery pack 12 connected in series. The negative terminal of the first battery pack 11 is connected to the positive terminal of the second battery pack 12. The battery 100 is connected to a first switching circuit 101. The first switching circuit 101 includes a bridge arm 23, which has an upper bridge arm and a lower bridge arm. The upper bridge arm is connected to the positive terminal of the first battery pack 11, and the lower bridge arm is connected to the negative terminal of the second battery pack 12. The node between the upper and lower bridge arms is connected to a first terminal of a first energy storage circuit 102. The second terminal of the first energy storage circuit 102 is connected to a first terminal of a second switching circuit 105. The second terminal of the second switching circuit 105 is connected to the midpoint between the first battery pack 11 and the second battery pack 12. The second terminal of the first energy storage circuit 102 is also connected to the positive output terminal of an external energy device 103, and the negative output terminal of the external energy device 103 is connected to the negative terminal of the second battery pack 12. The second terminal of the first energy storage circuit 102 is also connected to the first terminal of the voltage regulator circuit 104, and the second terminal of the voltage regulator circuit 104 is connected to the negative terminal of the second battery pack 12. The voltage regulator circuit 104 includes a first capacitor C1 and a first switch connected in series.

[0283] Battery charging control methods include:

[0284] Obtain the temperature of battery 100;

[0285] In response to the temperature of battery 100 being greater than or equal to a preset temperature threshold, the upper bridge arm is controlled to turn on and the lower bridge arm is turned off, so as to perform charging of the first capacitor C1 by battery 100, and

[0286] The upper bridge arm is turned off and the lower bridge arm is turned on, so that the external energy device 103 charges the first energy storage circuit 102, and

[0287] The lower bridge arm is turned off and the upper bridge arm is turned on to perform the operation of external energy device 103 and first energy storage circuit 102 charging battery 100 together; wherein, the operation of external energy device 103 charging first energy storage circuit 102 and external energy device 103 and first energy storage circuit 102 charging battery 100 together is repeated N1 times, and N1 is an integer greater than 1.

[0288] The battery charging control method may further include: in response to the temperature of the battery 100 being less than a preset temperature threshold, controlling the battery 100 to alternately be in a first heating stage and a second heating stage through a first switching circuit 101 and a second switching circuit 105 until the temperature of the battery 100 is greater than or equal to the preset temperature threshold.

[0289] The first heating stage includes: sequentially and alternately executing the first step and the second step to repeat the operation of the first battery pack 11 charging the first energy storage circuit 102 and the first energy storage circuit 102 charging the second battery pack 12 N2 times, where N2 is an integer greater than or equal to 1.

[0290] The second heating stage includes: sequentially and alternately performing the second step and the first step to repeat the operation of the second battery pack 12 charging the first energy storage circuit 102 and the first energy storage circuit 102 charging the first battery pack 11 N3 times, where N3 is an integer greater than or equal to 1.

[0291] The first step includes: controlling the upper bridge arm and the second switch circuit 105 to be turned on, and the lower bridge arm to be turned off; the second step includes: controlling the lower bridge arm and the second switch circuit 105 to be turned on, and the upper bridge arm to be turned off.

[0292] Understandably, after the battery is connected to an external energy device, the battery temperature can be monitored in real time. If the battery temperature is detected to be greater than or equal to a preset temperature threshold, the battery will charge the first capacitor, and the operation of the external energy device charging the first energy storage circuit and the operation of the external energy device and the first energy storage circuit charging the battery together will be repeated N1 times.

[0293] If the battery temperature is detected to be lower than the preset temperature threshold before charging begins, the BMS controls the battery to alternate between the first heating stage and the second heating stage until the battery temperature is greater than or equal to the preset temperature threshold. The BMS then sends a charging message to the external energy device to control the external energy device to charge the battery.

[0294] If the battery temperature is detected to be lower than the preset temperature threshold during charging, the BMS can send a message to the external energy device to stop charging and control the battery to alternate between the first heating stage and the second heating stage until the battery temperature is greater than or equal to the preset temperature threshold. Then, the BMS sends a message to the external energy device to charge the battery until the battery is fully charged.

[0295] 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 control method, characterized in that, The battery includes a first battery pack and a second battery pack connected in series. The battery is connected to a first switching circuit, wherein the first switching circuit includes a first connection point, a second connection point, and a third connection point interconnected by switching elements. The first connection point is connected to the positive terminal of the battery, the second connection point is connected to the negative terminal of the battery, a second terminal of a first energy storage circuit is also connected to a first terminal of a second switching circuit, a second terminal of the second switching circuit is connected to the midpoint between the first battery pack and the second battery pack, and either the first connection point or the second connection point is also connected to a first terminal of an external energy device. The third connection point is connected to the first terminal of the first energy storage circuit, and the second terminal of the first energy storage circuit is connected to the second terminal of the external energy device. The method includes: The first switching circuit enables the external energy device to charge the first energy storage circuit and the external energy device and the first energy storage circuit to charge the battery together.

2. The method according to claim 1, characterized in that, A voltage regulator circuit is connected in parallel between the first and second terminals of the external energy device. The voltage regulator circuit includes a first capacitor. Before the first switching circuit is used to charge the first energy storage circuit via the external energy device and to charge the battery together via the external energy device and the first energy storage circuit, the following steps are also included: The battery charges the first capacitor via the first switching circuit and the first energy storage circuit.

3. The method according to claim 1 or 2, characterized in that, The method further includes: Obtain the temperature of the battery; In response to the battery temperature being greater than or equal to a preset temperature threshold, the first switching circuit performs the charging of the first energy storage circuit by the external energy device and the charging of the battery by the external energy device and the first energy storage circuit together. In response to the battery temperature being lower than the preset temperature threshold, the battery is heated through the first switching circuit, the second switching circuit, and the first energy storage circuit.

4. The method according to claim 3, characterized in that, The step of heating the battery in response to the battery temperature being lower than the preset temperature threshold includes: In response to the battery temperature being lower than the preset temperature threshold, the battery is controlled to be in a first heating stage through the first switching circuit, the second switching circuit, and the first energy storage circuit. The first heating stage includes: repeatedly performing the operation of the first battery pack charging the first energy storage circuit and the first energy storage circuit charging the second battery pack N2 times through the first switching circuit and the second switching circuit; N2 is an integer greater than or equal to 1.

5. The method according to claim 3, characterized in that, The step of heating the battery in response to the battery temperature being lower than the preset temperature threshold includes: In response to the battery temperature being lower than the preset temperature threshold, the battery is controlled to alternately enter a first heating stage and a second heating stage via the first switching circuit and the second switching circuit. The first heating stage includes: repeatedly performing the operation of the first battery pack charging the first energy storage circuit and the first energy storage circuit charging the second battery pack N2 times through the first switching circuit and the second switching circuit, where N2 is an integer greater than or equal to 1. The second heating stage includes: repeatedly performing the operation of the second battery pack charging the first energy storage circuit and the first energy storage circuit charging the first battery pack N3 times through the first switching circuit and the second switching circuit, where N3 is an integer greater than or equal to 1.

6. The method according to claim 4 or 5, characterized in that, A second energy storage circuit is also connected in parallel across the two ends of the battery. The first end of the second energy storage circuit is connected to the positive terminal of the battery, and the second end of the second energy storage circuit is connected to the negative terminal of the battery. The first heating stage further includes: Through the first switching circuit and the second switching circuit, the operation of the first battery pack charging the second energy storage circuit and the second energy storage circuit charging the second battery pack are repeated N4 times, where N4 is an integer greater than or equal to 1.

7. The method according to claim 6, characterized in that, The first heating stage also includes: Through the first switching circuit and the second switching circuit, the first battery pack charges the first energy storage circuit and the second energy storage circuit charges the second battery pack simultaneously. The first switching circuit and the second switching circuit simultaneously perform the charging of the second battery pack by the first energy storage circuit and the charging of the second energy storage circuit by the first battery pack.

8. The method according to claim 5, characterized in that, A second energy storage circuit is connected in parallel across the two ends of the battery. The first end of the second energy storage circuit is connected to the positive terminal of the battery, and the second end of the second energy storage circuit is connected to the negative terminal of the battery. The first heating stage also includes: Through the first switching circuit and the second switching circuit, the operation of the first battery pack charging the second energy storage circuit and the second energy storage circuit charging the second battery pack are repeated N4 times, where N4 is an integer greater than or equal to 1; and / or The second heating stage also includes: Through the first switching circuit and the second switching circuit, the operation of charging the second energy storage circuit with the second battery pack and charging the first battery pack with the second energy storage circuit is performed N5 times, where N5 is an integer greater than or equal to 1.

9. The method according to claim 8, characterized in that, The first heating stage also includes: Simultaneously, through the first switching circuit and the second switching circuit, the first battery pack charges the first energy storage circuit and the second energy storage circuit charges the second battery pack; and simultaneously, through the first switching circuit and the second switching circuit, the first energy storage circuit charges the second battery pack and the first battery pack charges the second energy storage circuit; and / or The second heating stage also includes: The first switch circuit and the second switch circuit simultaneously perform the charging of the first energy storage circuit by the second battery pack and the charging of the first battery pack by the second energy storage circuit, and the first energy storage circuit simultaneously perform the charging of the first battery pack by the first energy storage circuit and the charging of the second energy storage circuit by the second battery pack by the first switch circuit and the second switch circuit.

10. The method according to any one of claims 1-9, characterized in that, The first end of the external energy device is connected to the second connection point. The first switching circuit includes a bridge arm, which includes an upper bridge arm and a lower bridge arm connected in series. The upper bridge arm is connected to the first connection point, and the lower bridge arm is connected to the second connection point. The node between the upper bridge arm and the lower bridge arm serves as the third connection point. The step of charging the first energy storage circuit by the external energy device and charging the battery together by the external energy device and the first energy storage circuit through the first switching circuit includes: The upper bridge arm and the second switching circuit are turned off, and the lower bridge arm is turned on, so as to enable the external energy device to charge the first energy storage circuit. The lower bridge arm and the second switching circuit are turned off, and the upper bridge arm is turned on, so that the external energy device and the first energy storage circuit can charge the battery together.

11. The method according to claim 10, characterized in that, When a voltage regulator circuit is connected in parallel between the first and second terminals of the external energy device, and the voltage regulator circuit includes a first capacitor, the process of alternately charging the first energy storage circuit by the external energy device and charging the battery by the external energy device and the first energy storage circuit together via the first switching circuit further includes: The upper bridge arm is turned on and the lower bridge arm is turned off to enable the battery to charge the first capacitor.

12. The method according to claim 11, characterized in that, Controlling the battery to be in the first heating stage includes: sequentially and alternately performing the first step and the second step. The first step includes: controlling the upper bridge arm and the second switching circuit to be turned on, and the lower bridge arm to be turned off; The second step includes: controlling the lower bridge arm and the second switching circuit to be turned on, and the upper bridge arm to be turned off.

13. The method according to claim 12, characterized in that, The method includes controlling the battery to be in the second heating stage in response to the battery temperature being lower than a preset temperature threshold, wherein the battery is controlled to alternately be in a first heating stage and a second heating stage via the first switching circuit and the second switching circuit. The second step and the first step are performed alternately in sequence.

14. A battery charging control circuit, characterized in that, The battery includes a first battery pack and a second battery pack connected in series, and the charging control circuit includes: The first switching circuit includes a first connection point, a second connection point, and a third connection point that are interconnected by switching elements; the first connection point is connected to the positive terminal of the battery, the second connection point is connected to the negative terminal of the battery, and the first connection point or the second connection point is also used to connect to the first terminal of an external energy device; A second switching circuit, wherein the first end of the second switching circuit is connected to the second end of the first energy storage circuit, and the second end of the second switching circuit is connected to the midpoint between the first battery pack and the second battery pack; A first energy storage circuit, wherein a first end of the first energy storage circuit is connected to the third connection point, and a second end of the first energy storage circuit is used to connect to the second end of the external energy device; The circuit also includes: The controller is configured as follows: The first switching circuit enables the external energy device to charge the first energy storage circuit and the external energy device and the first energy storage circuit to charge the battery together.

15. The charging control circuit according to claim 14, characterized in that, The charging control circuit also includes: A voltage regulator circuit, comprising a first capacitor, a first terminal of the voltage regulator circuit being connected to a second terminal of the first energy storage circuit, and a second terminal of the voltage regulator circuit being connected to either the first connection point or the second connection point. The voltage regulator circuit is used to be connected in parallel between the first and second terminals of the external energy device during the charging of the battery by the external energy device.

16. The charging control circuit according to claim 14 or 15, characterized in that, The controller is also configured to: Obtain the temperature of the battery; In response to the battery temperature being greater than or equal to a preset temperature threshold, the first switching circuit performs the charging of the first energy storage circuit by the external energy device and the charging of the battery by the external energy device and the first energy storage circuit together. In response to the battery temperature being lower than the preset temperature threshold, the battery is heated through the first switching circuit, the second switching circuit, and the first energy storage circuit.

17. The charging control circuit according to claim 16, characterized in that, The charging control circuit further includes a voltage regulator circuit, which includes: First capacitor; The first switch and the first capacitor are connected in series between the second terminal of the first energy storage circuit and the first connection point / second connection point. The voltage regulator circuit is used to be connected in parallel to the first terminal and the second terminal of the external energy device during the charging of the battery by the external energy device. The controller is configured as follows: In response to the battery temperature being greater than or equal to a preset temperature threshold, the first switch is controlled to close. In response to the battery temperature being lower than the preset temperature threshold, the first switch is controlled to turn off.

18. The charging control circuit according to claim 16 or 17, characterized in that, The controller is configured to: In response to the battery temperature being lower than the preset temperature threshold, the battery is controlled to be in a first heating stage through the first switching circuit, the second switching circuit, and the first energy storage circuit to heat the battery. The first heating stage includes: repeatedly performing the operation of the first battery pack charging the first energy storage circuit and the first energy storage circuit charging the second battery pack N2 times through the first switching circuit and the second switching circuit, where N2 is an integer greater than or equal to 1.

19. The charging control circuit according to claim 18, characterized in that, The charging control circuit also includes: A second energy storage circuit, wherein a first terminal of the second energy storage circuit is connected to the positive terminal of the battery, and a second terminal of the second energy storage circuit is connected to the negative terminal of the battery, and the controller is further configured to: During the first heating phase, the operation of the first battery pack charging the second energy storage circuit and the second energy storage circuit charging the second battery pack is repeatedly performed N4 times through the first switching circuit and the second switching circuit, where N4 is an integer greater than or equal to 1.

20. The charging control circuit according to claim 19, characterized in that, The controller is configured to: During the first heating phase, the first switching circuit and the second switching circuit simultaneously perform the charging of the first energy storage circuit by the first battery pack and the charging of the second battery pack by the second energy storage circuit. During the first heating phase, the first energy storage circuit charges the second battery pack and the first battery pack charges the second energy storage circuit simultaneously through the first switching circuit and the second switching circuit.

21. The charging control circuit according to claim 16 or 17, characterized in that, The controller is configured to: In response to the battery temperature being lower than the preset temperature threshold, the battery is controlled to alternately enter a first heating stage and a second heating stage through the first switching circuit and the second switching circuit to heat the battery. The first heating stage includes: repeatedly performing the operation of the first battery pack charging the first energy storage circuit and the first energy storage circuit charging the second battery pack N2 times through the first switching circuit and the second switching circuit, where N2 is an integer greater than or equal to 1. The second heating stage includes: repeatedly performing the operation of the second battery pack charging the first energy storage circuit and the first energy storage circuit charging the first battery pack N3 times through the first switching circuit and the second switching circuit, where N3 is an integer greater than or equal to 1.

22. The charging control circuit according to claim 21, characterized in that, A second energy storage circuit is also connected in parallel across the two ends of the battery, wherein a first end of the second energy storage circuit is connected to the positive terminal of the battery, and a second end of the second energy storage circuit is connected to the negative terminal of the battery. The controller is further configured to: During the first heating phase, the operation of the first battery pack charging the second energy storage circuit and the second energy storage circuit charging the second battery pack are repeatedly performed N4 times via the first switching circuit and the second switching circuit, where N4 is an integer greater than or equal to 1; and / or During the second heating stage, the operation of charging the second energy storage circuit with the second battery pack and charging the first battery pack with the second energy storage circuit is performed N5 times through the first switching circuit and the second switching circuit, where N5 is an integer greater than or equal to 1.

23. The charging control circuit according to claim 22, characterized in that, The controller is configured to: During the first heating phase, the first battery pack charges the first energy storage circuit and the second energy storage circuit charges the second battery pack simultaneously via the first switching circuit and the second switching circuit; and the first energy storage circuit charges the second battery pack and the first battery pack charges the second energy storage circuit simultaneously via the first switching circuit and the second switching circuit; and / or During the second heating stage, the second battery pack charges the first energy storage circuit and the second energy storage circuit charges the first battery pack simultaneously via the first switching circuit and the second switching circuit, and the first energy storage circuit charges the first battery pack and the second battery pack charges the second energy storage circuit simultaneously via the first switching circuit and the second switching circuit.

24. The charging control circuit according to any one of claims 19, 20, 22 or 23, characterized in that, The first energy storage circuit includes at least one inductor, and the second energy storage circuit includes a second capacitor.

25. The charging control circuit according to any one of claims 14-24, characterized in that, The first switching circuit includes a bridge arm, which includes an upper bridge arm and a lower bridge arm connected in series. The upper bridge arm is connected to the first connection point, and the lower bridge arm is connected to the second connection point. The node between the upper bridge arm and the lower bridge arm serves as the third connection point.

26. A battery system, characterized in that, Includes the charging control circuit according to any one of claims 14-25.

27. An electrical appliance, characterized in that, Includes the battery system of claim 26, wherein the battery system supplies power to the electrical device.

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