Battery charging control circuit, battery system and electric device

Abstract

The utility model provides a battery charging control circuit, a battery system and an electric device, and belongs to the technical field of batteries. The charging control circuit comprises a first switching circuit, a first connection point and a second connection point of the first switching circuit are connected with the positive electrode and the negative electrode of the battery respectively, and the first connection point or the second connection point is further used for being connected with the first end of an external energy device; the first end of the second switch circuit is connected with the second end of the first energy storage circuit, and the second end of the second switch circuit is connected to the middle point between the first battery pack and the second battery pack; a first end of the first energy storage circuit is connected with a third connection point of the first switching circuit, and a second end of the first energy storage circuit is used for being connected with a second end of an external energy device; the first switching circuit is configured to connect the first energy storage circuit and the external energy device to form a first charging loop, and connect the battery, the first energy storage circuit and the external energy device to form a second charging loop.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a battery charging control circuit, a battery system and a power consumption device. BACKGROUND

[0002] Energy saving and emission reduction is the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their energy saving and environmental protection advantages. For electric vehicles, battery technology is an important factor for their development.

[0003] The charging efficiency of the battery is related to the voltage output by the charging device to the battery. If the output voltage of the charging device is too small, it may cause the output voltage of the charging device to be unmatched with the voltage of the battery or the charging speed of the battery to be slow, thereby reducing the charging efficiency of the battery. UTILITY MODEL CONTENT

[0004] The present application aims to at least solve one of the technical problems in the background art. To this end, one object of the present application is to provide a battery charging control circuit, a battery system and a power consumption device to improve the charging efficiency of the battery.

[0005] Embodiments of the first aspect of the present application provide a battery charging control circuit, the battery comprising a first battery pack and a second battery pack connected in series, the charging control circuit comprising a first switching circuit comprising a first connection point, a second connection point and a third connection point connected to each other through switching elements; the first connection point is connected to the positive electrode of the battery, the second connection point is connected to the negative electrode of the battery, and the first connection point or the second connection point is further used to connect the first end of an external energy device; a second switching circuit, the first end of the second switching circuit is connected to the second end of a first energy storage circuit, 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, the first end of the first energy storage circuit is connected to the third connection point, and the second end of the first energy storage circuit is used to connect the second end of the external energy device; the first switching circuit is configured to connect the first energy storage circuit and the external energy device to form a first charging loop, so that the external energy device can charge the first energy storage circuit, and connect the battery, the first energy storage circuit and the external energy device to form a second charging loop, so that the external energy device and the first energy storage circuit can jointly charge the battery.

[0006] In the technical solution of the embodiment of the application, the switch element enables any two of the first connection point, the second connection point and the third connection point of the first switch circuit to be connected, thereby enabling the first energy storage circuit and the external energy device to be selectively connected, enabling the external energy device to charge the first energy storage circuit and the first energy storage circuit to store energy. The first energy storage circuit, the battery and the external energy device can also be connected through the first switch circuit, enabling the external energy device and the first energy storage circuit to be connected in series and jointly charge the battery, thereby enabling the battery to be boosted charged. That is, the first switch circuit and the first energy storage circuit can be used to boost charge the battery, thereby simplifying the circuit and improving the charging efficiency of the battery.

[0007] In addition, the second switch circuit is further arranged to connect the second end of the first energy storage circuit and the midpoint between the first battery pack and the second battery pack, enabling the first battery pack and the second battery pack to form a loop with the first energy storage circuit through the second switch circuit, thereby enabling the first battery pack and the second battery pack to exchange energy with the first energy storage circuit, and further enabling the first battery pack and the second battery pack to be heated, and enabling the charging control circuit to further have the function of heating the battery, thereby further improving the charging efficiency of the battery.

[0008] In some embodiments, the charging control circuit further comprises a voltage stabilizing circuit, the voltage stabilizing circuit comprising a first capacitor, the first end of the voltage stabilizing circuit being connected to the second end of the first energy storage circuit, and the second end of the voltage stabilizing circuit being connected to the first connection point or the second connection point, the voltage stabilizing circuit being used to be connected in parallel between the first end and the second end of the energy device during charging of the battery by the energy device. The first capacitor in the voltage stabilizing circuit plays a voltage stabilizing role during charging of the battery by the external energy device, thereby further improving the charging efficiency of the battery.

[0009] In some embodiments, the battery comprises a first battery pack and a second battery pack connected in series, and the first switch circuit and the second switch circuit are configured to enable the first energy storage circuit and the first battery pack / second battery pack to be connected to form a heating loop for the battery. The first energy storage circuit can also heat the battery through the second switch circuit, thereby enabling the battery to be heated when the temperature of the battery is low, and further enabling the temperature of the battery to be increased, and the battery to be charged after the temperature is increased, thereby further improving the charging efficiency of the battery.

[0010] In some embodiments, the charging control circuit further includes a voltage regulator circuit, which includes: a first capacitor; and a first switch. 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 connect in parallel to the first and second terminals of the energy device during battery charging. The first switch enables the switching between the first capacitor and the first energy storage circuit and the first connection point / second connection point. Thus, during battery charging by an 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. This prevents the current flow in the heating circuit from being affected during battery heating via the first switch circuit, the second switch circuit, and the first energy storage circuit, thus avoiding any adverse effects on battery heating.

[0011] In some embodiments, the charging control circuit further includes a second energy storage circuit. 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. A first switching circuit and a second switching circuit are configured to connect the second energy storage circuit to either the first battery pack or the second battery pack to form a heating circuit for the battery. The second energy storage circuit can also transfer energy from the first battery pack to the second battery pack, further improving the battery's heating efficiency.

[0012] 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 a better energy storage capacity 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. This ensures that current always flows through both the first and second battery packs in the battery heating circuit, which helps maintain the stability of the current flowing through them. Simultaneously, it reduces the size and weight of the battery heating circuit, saving costs.

[0013] In some embodiments, the first switching circuit includes a first bridge arm, which includes a first upper bridge arm and a first lower bridge arm connected in series. The first upper bridge arm is connected to a first connection point, the first lower bridge arm is connected to a second connection point, and the node between the first upper bridge arm and the first lower bridge arm serves as a third connection point. The first bridge arm has a simple structure and is easy to control, which simplifies the circuit while improving the reliability of battery heating control.

[0014] In some embodiments, there are multiple first bridge arms connected in parallel. The first energy storage circuit includes multiple first inductors connected in parallel, with each first inductor corresponding to one of the multiple first bridge arms. The multiple first inductors can suppress high-frequency noise in the circuit, making the current more stable and enhancing the battery's self-heating effect.

[0015] In some embodiments, the first switching circuit and the first energy storage circuit are motors connected to the battery, the plurality of first bridge arms are multi-phase bridge arms in the motor, and the plurality of first inductors are motor windings in the motor. In this way, the existing motor in the electrical device can be used to achieve self-heating of the battery without adding additional inductors to the electrical device, resulting in a smaller weight and reduced cost of the electrical device.

[0016] In some embodiments, the first energy storage circuit further includes a second inductor, which is connected in series with a plurality of first inductors that are connected in parallel. By connecting the second inductor in series, the amount of electricity stored in the first energy storage circuit can be increased, thereby enhancing the self-heating effect of the battery.

[0017] An embodiment of the second aspect of this application provides a battery system that includes the battery charging control circuit described in the above embodiments.

[0018] An embodiment of the third 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.

[0019] 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

[0020] 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.

[0021] Figure 1 This is a schematic diagram of the vehicle structure according to some embodiments of this application;

[0022] Figure 2 This is one of the functional block diagrams of a battery charging control circuit according to some embodiments of this application;

[0023] Figure 3 This is a second functional block diagram of a battery charging control circuit according to some embodiments of this application;

[0024] Figure 4This is one of the structural schematic diagrams of a battery charging control circuit according to some embodiments of this application;

[0025] Figure 5 This is a second schematic diagram of the structure of a battery charging control circuit according to some embodiments of this application;

[0026] Figure 6 This is the third schematic diagram of the battery charging control circuit of some embodiments of this application;

[0027] Figure 7 This is a fourth schematic diagram of the battery charging control circuit of some embodiments of this application;

[0028] Figure 8 This is one of the schematic diagrams of the current path forming a heating circuit in the battery charging control circuit of some embodiments of this application;

[0029] Figure 9 This is a second schematic diagram of the current path forming a heating circuit in the battery charging control circuit of some embodiments of this application;

[0030] Figure 10 This is the third schematic diagram of the current path forming the heating circuit in the battery charging control circuit of some embodiments of this application;

[0031] Figure 11 This is the fourth schematic diagram of the current path forming a heating circuit in the battery charging control circuit of some embodiments of this application;

[0032] Figure 12 This is the fifth schematic diagram of the battery charging control circuit of some embodiments of this application;

[0033] Figure 13 This is a current path diagram of the battery charging the first capacitor in the battery charging control circuit of some embodiments of this application;

[0034] Figure 14 This is a current path diagram for forming a first charging loop in a battery charging control circuit of some embodiments of this application;

[0035] Figure 15 This is a current path diagram for forming a second charging loop in the battery charging control circuit of some embodiments of this application;

[0036] Figure 16 This is one of the current path diagrams for forming a heating loop in the battery charging control circuit during the first heating stage of battery heating in some embodiments of this application;

[0037] Figure 17 This is a second current path diagram of the battery charging control circuit forming a heating loop in the first heating stage of battery heating according to some embodiments of this application.

[0038] Figure 18 This is one of the current path diagrams for the battery charging control circuit to form a heating loop in the second heating stage of battery heating according to some embodiments of this application;

[0039] Figure 19 This is a second current path diagram of the battery charging control circuit forming a heating loop in the second heating stage of battery heating according to some embodiments of this application.

[0040] Explanation of reference numerals in the attached figures:

[0041] 1000 vehicles;

[0042] 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;

[0043] Vehicle controller 200;

[0044] Motor 300;

[0045] First battery pack 11, second battery pack 12;

[0046] Current sensor 20, first connector 21, second connector 22, first bridge arm 23;

[0047] First capacitor C1, second capacitor C2, charging positive relay K11, charging negative relay K12, first inductor L1, second inductor L2, first switch V1, second switch V2, first upper bridge arm switch V3, first lower bridge arm switch V4, first connection point P1, second connection point P2, third connection point P3, first resistor R1. Detailed Implementation

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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).

[0054] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used as energy storage modules in hydropower, thermal power, wind power, and solar power plants, but also widely applied 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.

[0055] 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.

[0056] 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.

[0057] Based on the above considerations, a battery charging control circuit is designed. The first and second connection points 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 the first energy storage circuit. The first and second terminals of the external energy device are connected to the first / second connection point of the battery and the second terminal of the first energy storage circuit, respectively. The first switching circuit can connect the first energy storage circuit and the external energy device to form a first charging loop, allowing the external energy device to charge the first energy storage circuit. It can also connect the battery, the first energy storage circuit, and the external energy device to form a second charging loop, allowing the external energy device and the first energy storage circuit to charge the battery together. Because the first energy storage circuit stores energy while being charged, 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. 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.

[0058] The battery heating method disclosed in this application can be used, but is not limited to, for heating batteries in electrical devices such as vehicles, ships, or aircraft.

[0059] 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., and spacecraft can include airplanes, rockets, space shuttles, etc.

[0060] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical system according to an embodiment of this application.

[0061] Please refer to Figure 1 , Figure 1 This 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.

[0062] 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.

[0063] refer to Figure 2 as well as Figure 3 This application provides a battery charging control circuit. The battery includes a first battery pack 11 and a second battery pack 12 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, with the first terminal of the second switching circuit 105 connected to the second terminal of a first energy storage circuit 102, and the second terminal of the second switching circuit 105 connected to the first battery pack 103. The midpoint between battery pack 11 and the second battery pack 12; a first energy storage circuit 102, the first end of which is connected to a third connection point P3, and the second end of which is used to connect to the second end of an external energy device 103; a first switching circuit 101 is configured to connect the first energy storage circuit 102 and the external energy device 103 to form a first charging circuit, so that the external energy device 103 can charge the first energy storage circuit 102, and to connect the battery 100, the first energy storage circuit 102 and the external energy device 103 to form a second charging circuit, so that the external energy device 103 and the first energy storage circuit 102 can charge the battery 100 together.

[0064] The first charging circuit first boosts the voltage of the first energy storage circuit 102, and then connects it in series with the external energy device 103, thereby increasing the series voltage. The second charging circuit then boosts the voltage of the battery 100 for charging.

[0065] 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.

[0066] 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.

[0067] It is understandable that the first connection point P1, the second connection point P2, and the third connection point P3 can all be connected.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] like Figure 3 As shown, in some other embodiments, the first end 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 end of the external energy device 103 can be the negative output terminal, and the second end can be the positive output terminal.

[0075] 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.

[0076] 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 102 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.

[0077] In some embodiments, the battery charging control circuit further includes a controller, which can control the first switching circuit 101 and the external energy device 103 according to pre-stored instructions to form a first charging circuit and a second charging circuit. The controller may include, but is not limited to, the vehicle's MCU (Microcontroller Unit) or the controller in the battery 100's BMS (Battery Management System).

[0078] 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 first charging circuit with the external energy device 103 through the first switching circuit 101, and the external energy device 103 charges the first energy storage circuit 102. The first energy storage circuit 102, the external energy device 103, and the battery 100 form a second charging circuit, and the external energy device 103 and the first energy storage circuit 102 jointly charge the battery 100.

[0079] 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.

[0080] In addition, a second switch circuit 105 is provided to connect the second end of the first energy storage circuit 102 and the midpoint between the first battery pack 11 and the second battery pack 12, respectively, so that the first battery pack 11 and the second battery pack 12 can form a circuit with the first energy storage circuit 102 through the second switch circuit 105, so that the first battery pack 11 and the second battery pack 12 can exchange energy with the first energy storage circuit 102, thereby heating the first battery pack 11 and the second battery pack 12, so that the charging control circuit also has the function of heating the battery 100, so as to further improve the charging efficiency of the battery 100.

[0081] refer to Figure 4According 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, the first terminal of the voltage regulator circuit 104 being connected to the second terminal of the first energy storage circuit 102, the second terminal of the voltage regulator circuit 104 being connected to a first connection point P1 or a second connection point P2, and the voltage regulator circuit 104 being used to be connected in parallel between the first terminal and the second terminal of the energy device 103 during the charging of the battery 100 by the energy device 103.

[0082] 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 the two terminals of the external energy device 103.

[0083] 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 the two terminals of the external energy device 103. 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.

[0084] After the first capacitor C1 is charged, it is connected in parallel across the two ends of the external energy device 103, which can reduce the ripple voltage output by the energy device 103, improve stability, filter out high-frequency noise and interference, and play a role in voltage stabilization.

[0085] For example, the battery 100 can first charge the first capacitor C1 through the first switching circuit 101 and the first energy storage circuit 102, and then the first charging circuit 101 can form a first charging circuit to enable the external energy device 103 to charge the first energy storage circuit 102. The first switching circuit 101 can also form a second charging circuit to enable the external energy device 103 and the first energy storage circuit 102 to charge the battery together.

[0086] With the second terminal of the voltage regulator circuit 104 connected to the first connection point P1, the third connection point P3 and the second connection point P2 can be controlled to conduct through a 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. This forms a circuit with the battery 100, the first energy storage circuit 102, and the voltage regulator circuit 104, thereby enabling the battery 100 to charge the first capacitor C1. In some embodiments, the third connection point P3 and the second connection point P2 can be controlled to conduct through a controller.

[0087] 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 a 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, and the second terminal of the voltage regulator circuit 104 is connected to the negative terminal of the battery 100. This forms a circuit with the battery 100, the first energy storage circuit 102, and the voltage regulator circuit 104, thereby enabling the battery 100 to charge the first capacitor C1. In some embodiments, the third connection point P3 and the first connection point P1 can be controlled to conduct through a controller.

[0088] In the above technical solution, the first capacitor C1 in the voltage regulator circuit 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.

[0089] According to some embodiments of this application, the first switching circuit 101 and the second switching circuit 105 are configured to connect the first energy storage circuit 102 and the first battery pack 11 / second battery pack 12 to form a heating circuit for the battery 100.

[0090] 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.

[0091] When the first connection point P1 and the third connection point P3 of the first switching circuit 101 are connected, and the second switching circuit 105 is connected, the first switching circuit 101, the second switching circuit 105 and the first energy storage circuit 102 can form a heating circuit with the first battery pack 11, so that the first battery pack 11 and the first energy storage circuit 102 can exchange energy. For example, the first battery pack 11 charges the first energy storage circuit 102, or the first energy storage circuit 102 charges the first battery pack 11 to heat the first battery pack 11.

[0092] When the second connection point P2 and the third connection point P3 of the first switching circuit 101 are connected, and the second switching circuit 105 is connected, the first switching circuit 101, the second switching circuit 105 and the first energy storage circuit 102 can form a heating circuit with the second battery pack 12, so that the second battery pack 12 and the first energy storage circuit 102 can exchange energy. For example, the second battery pack 12 charges the first energy storage circuit 102, or the first energy storage circuit 102 charges the second battery pack 12 to heat the second battery pack 12.

[0093] When the battery needs to be charged, the second switch circuit 105 can be turned off, and the first switch circuit 101 can be used to form a first charging circuit and a second charging circuit to boost the battery 100.

[0094] In some embodiments, the controller can control the first switching circuit 101 and the second switching circuit 105 to connect the first energy storage circuit 102 and the first battery pack 11 / second battery pack 12 to form a heating circuit for the battery 100, or to form a first charging circuit and a second charging circuit.

[0095] For example, the controller is configured to control the first switching circuit 101 and the second switching circuit 105 to form a heating circuit for the battery in 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; and to control the first switching circuit 101 and the second switching circuit 105 to form a first charging circuit and a second charging circuit in response to the temperature of at least one of the first battery pack 11 and the second battery pack 12 being less than the preset temperature threshold.

[0096] In the above technical solution, only the second switching circuit 105 is added, which 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, so as 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.

[0097] refer to Figure 5 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 V1, the first switch V1 and the first capacitor C1 being connected in series between the second terminal of the first energy storage circuit 102 and the first connection point P1 / second connection point P2. The voltage regulator circuit 104 is used to be connected in parallel to the first and second terminals of the energy device 103 during the charging of the battery 100 by the energy device 103.

[0098] In some embodiments, where the first end of the voltage regulator circuit 104 is 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, the voltage regulator circuit 104 may also 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.

[0099] During the period when the first switch circuit 101 and the second switch circuit 105 connect the first energy storage circuit 102 and the first battery pack 11 / second battery pack 12 to form a heating circuit for the battery 100, the first switch V1 is turned off to prevent the first capacitor C1 from affecting the current flow in the heating circuit.

[0100] When the battery 100 needs to be charged, the first switch V1 can be closed and the second switch circuit 105 can be opened. Through the first switch circuit 101 and the first energy storage circuit 102, the battery 100 charges the first capacitor C1. Then, during the period when the first switch circuit 101 connects the first energy storage circuit 102 and the external energy device 103 to form a first charging circuit, and connects the first energy storage circuit 102, the battery 100, and the external energy device 103 to form a second charging circuit, the first switch V1 remains closed. This allows the first capacitor C1 to be connected in parallel across the external energy device 103 during discharge, thus providing voltage regulation.

[0101] In the above technical solution, the first switch V1 can realize the switching between the first capacitor C1 and the first energy storage circuit 102 and the first connection point P1 / second connection point P2. In this way, during the heating of the battery 100, the first switch V1 is turned off, so that the voltage regulator circuit 104 is disconnected from the first energy storage circuit 102. Therefore, the current flow in the heating circuit will not be 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 will not have an adverse effect on the heating of the battery 100.

[0102] refer to Figure 6 According to some embodiments of this application, the charging control circuit further includes a second energy storage circuit 106. 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 switch circuit 101 and the second switch circuit 105 are configured to connect the second energy storage circuit 106 with the first battery pack 11 or the second battery pack 12 to form a heating circuit for the battery 100.

[0103] 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 with the first energy storage circuit 102. In this way, the second energy storage circuit 106 can be connected to the midpoint between 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. Thus, the second energy storage circuit 106 can be connected to the first battery pack 11 and the second battery pack 12 through the first switching circuit 101 and the first energy storage circuit 102 respectively, so that the second energy storage circuit 106 can exchange energy with the first battery pack 11 and the second battery pack 12 respectively, so as to further heat the first battery pack 11 and the second battery pack 12.

[0104] In some embodiments, the first battery pack 11 can form a loop 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, or the second energy storage circuit 106 charges the first battery pack 11.

[0105] The second battery pack 12 can form a loop 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 battery pack 12 charges the second energy storage circuit 106, or the second energy storage circuit 106 charges the second battery pack 12.

[0106] In some embodiments, 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 and the second energy storage circuit 106 can simultaneously charge the second battery pack 12; and / or, 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 and the second energy storage circuit 106 can simultaneously charge the second battery pack 12. Both the first energy storage circuit 102 and the second energy storage circuit 106 can be inductors.

[0107] In other embodiments, while the first battery pack 11 charges the first energy storage circuit 102, the second energy storage circuit 106 charges the second battery pack 12; while the first energy storage circuit 102 charges the second battery pack 12, the first battery pack 11 charges the second energy storage circuit 106; and / or, while the second battery pack 11 charges the first energy storage circuit 102, the second energy storage circuit 106 charges the first battery pack 11; and while the first energy storage circuit 102 charges the first battery pack 11, the second battery pack 12 charges the second energy storage circuit 106. The first energy storage circuit 102 may include an inductor, and the second energy storage circuit 106 may include a capacitor.

[0108] 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.

[0109] refer to Figure 7 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.

[0110] 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.

[0111] For example, the first energy storage circuit 102 may also include multiple 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.

[0112] Both the inductor and the second capacitor C2 have charging and discharging functions, enabling simultaneous charging and discharging of the first battery pack 11 and the second capacitor C2 in the battery heating circuit via the first switch circuit 101 and the second switch circuit 105, and simultaneously charging the second battery pack 12 with the inductor and the second capacitor C2 with the first battery pack 11 via the first switch circuit 101 and the second switch circuit 105. Furthermore, it also enables simultaneous charging of the second battery pack 12 and the inductor, and charging of the first battery pack 11 with the second capacitor C2 via the first switch circuit 101 and the second switch circuit 105, and simultaneously charging of the first battery pack 11 with the inductor and the second capacitor C2 with the second battery pack 12 via the first switch circuit 101 and the second switch circuit 105.

[0113] like Figure 8 As shown, the second capacitor C2 is connected in parallel across the two ends of the battery 100. The first battery pack 11 forms a heating 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 for the 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 8 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.

[0114] like Figure 9As 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 9 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.

[0115] Similarly, through the first switch circuit 101 and the second switch circuit 105, the second battery pack 12 can charge the first energy storage circuit 102 and the second energy storage circuit 106 can charge the first battery pack 11 simultaneously, and through the switch circuit, the first energy storage circuit 102 can charge the first battery pack 11 and the second battery pack 12 can charge the second energy storage circuit 106 simultaneously. Figure 10 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 11 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.

[0116] 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 a constant current flow in both the first and second battery packs. This helps maintain the stability of the current flowing through the first and second battery packs, while also making the battery heating circuit smaller, reducing circuit weight and saving costs.

[0117] refer to Figure 12 According to some embodiments of this application, the first switching circuit 101 includes a first bridge arm 23, which includes a first upper bridge arm and a first lower bridge arm connected in series. The first upper bridge arm is connected to a first connection point P1, the first lower bridge arm is connected to a second connection point P2, and the node between the first upper bridge arm and the first lower bridge arm serves as a third connection point P3.

[0118] The first upper bridge arm includes a first upper bridge arm switch V3, and the first lower bridge arm includes a first lower bridge arm switch V4. By turning the first upper bridge arm switch V3 on / off, the first upper bridge arm can be turned on / off; similarly, by turning the first lower bridge arm switch V4 on / off, the first lower bridge arm can be turned on / off. The types of the first upper bridge arm switch V3 and the first lower bridge arm switch V4 include, but are not limited to, MOSFETs or IGBTs. In some embodiments, the on / off state of the first upper bridge arm switch V3 and the first lower bridge arm switch V4 can be controlled by a controller.

[0119] It is understood that the first upper bridge arm switch V3 and the first lower bridge arm switch V4 can be the switching elements in the above embodiments.

[0120] 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.

[0121] The first end of the first upper bridge arm is connected to the first connection point P1 for connection to the positive terminal of the battery 100, and the first end of the first lower bridge arm is connected to the second connection point P2 for connection to the negative terminal of the battery 100. The second ends of the first upper bridge arm and the second ends of the first lower bridge arm are connected, and the node between the first upper bridge arm and the first lower bridge arm serves as the third connection point P3, connected 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.

[0122] In some embodiments, when the battery 100 needs to be charged, the controller can control the second switching circuit 105 to disconnect and control the first bridge arm 23 to form a first charging circuit and a second charging circuit.

[0123] For example, when the battery 100 needs to be charged, the controller controls the second switch circuit 105 to disconnect.

[0124] The battery charging control circuit also includes a voltage regulator circuit 104. When 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, as follows... Figure 13As shown, before forming the first charging circuit and the second charging circuit, the controller first controls the first upper bridge arm and the first switch V1 to be turned on, and the first lower bridge arm to be turned off. The first terminal of the first energy storage circuit 102 is connected to the positive terminal of the battery 100 through the first 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 first upper bridge arm, the first energy storage circuit 102, and the voltage regulator circuit 104, enabling the battery 100 to charge the first capacitor C1. It is worth noting that when the second energy storage circuit 106 is the second capacitor C2, the battery 100 charges the second capacitor C2 simultaneously with the first capacitor C1. Figure 13 As shown, Figure 13 The solid line with arrows in the middle represents the current path of the battery charging the first capacitor C1 and the second capacitor C2.

[0125] After that, as Figure 14 As shown, the controller can control the first upper bridge arm to turn off, the first lower bridge arm and the first switch V1 to turn on, and control the charging positive relay K11 and the charging negative relay K12 to close. When the first upper bridge arm is off and the first lower bridge arm is on, the first connection point P1 and the third connection point P3 are disconnected, and the second connection point P2 and the third connection point P3 are connected, allowing the external energy device 103 to connect to the first terminal of the first energy storage circuit 102 through the first lower bridge arm, thereby forming a first charging circuit with the first energy storage circuit 102 to charge the first energy storage circuit 102. Figure 14 As shown, Figure 14 The solid line with an arrow in the middle represents the current path through which the external energy device 103 charges the first energy storage circuit 102. For example... Figure 15 As shown, the controller then controls the first upper bridge arm and the first switch to be turned on, the first lower bridge arm to be turned off, and the charging positive relay K11 and the charging negative relay K12 to be closed. With the first lower bridge arm off and the first upper bridge arm on, the second connection point P2 and the third connection point P3 are disconnected, and the first connection point P1 and the third connection point P3 are turned on. The first terminal of the first energy storage circuit 102 is connected to the positive terminal of the battery 100 through the first 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, so that the external energy device 103, the first energy storage circuit 102, and the battery 100 form a circuit through the first upper bridge arm, allowing the first energy storage circuit 102 and the external energy device 103 to jointly charge the battery 100. Figure 15 As shown, Figure 15 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.

[0126] When it is necessary to heat the battery 100, the controller controls the second switching circuit 105 to be turned on, controls the charging positive relay K11 and the charging negative relay K12 to be turned off, and alternately repeats the operation of turning on the first lower bridge arm and the operation of turning on the first upper bridge arm to form a heating circuit for the first battery pack 11 and a heating circuit for the second battery pack 12, respectively.

[0127] In some embodiments, heating the battery 100 may include a first heating stage and a second heating stage. In the first heating stage, the controller sequentially and alternately controls the first upper bridge arm and the first lower bridge arm to be turned on. In the second heating stage, the controller sequentially and alternately controls the first lower bridge arm and the first upper bridge arm to be turned on.

[0128] In the first heating stage, such as Figure 16 As shown, the controller first controls the first upper bridge arm to be turned on and the first lower bridge arm to be turned off. The first battery pack 11, the first upper bridge arm, the second switching circuit 105 and the first energy storage circuit 102 form a loop. The current flows from the positive terminal of the first battery pack 11 through the first upper bridge arm, the first energy storage circuit 102 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 16 The solid line with arrows shows the current path of the first battery pack 11 charging the first energy storage circuit 102.

[0129] In the first heating stage, such as Figure 17 As shown, the controller then controls the first lower bridge arm to be turned on. When the first upper bridge arm is turned off, the first lower bridge arm, the first energy storage circuit 102, the second switching circuit 105, and the second battery pack 12 form a loop. The current flows from the first energy storage circuit 102 through the positive terminal of the second battery pack 12, the negative terminal of the second battery pack 12, and the first lower bridge arm before flowing back to the first energy storage circuit 102. That is, the first energy storage circuit 102 releases energy to the second battery pack 12. Figure 17 The solid line with arrows shows the current path of the first energy storage circuit 102 charging the second battery pack 12.

[0130] like Figure 18 As shown, in the second heating stage, the controller first controls the first lower bridge arm to be turned on and the first upper bridge arm to be turned off. The second battery pack 12, the second switching circuit 105, the first lower bridge arm and the first energy storage circuit 102 form a loop. The current flows from the positive terminal of the second battery pack 12 through the first energy storage circuit 102 and the first lower bridge arm, and then flows back to the negative terminal of the second battery pack 12. The first energy storage circuit 102 stores energy. Figure 18 The solid line with arrows shows the current path of the second battery pack 12 charging the first energy storage circuit 102.

[0131] like Figure 19As shown, in the second heating stage, the controller then controls the first upper bridge arm to be turned on and the first lower bridge arm to be turned off. The first energy storage circuit 102, the first upper bridge arm, the first battery pack 11 and the second switching circuit 105 form a loop. The current flows from the first energy storage circuit 102 through the first upper bridge arm, the positive terminal of the first battery pack 11 and the negative terminal of the first battery pack 11 and then flows back to the first energy storage circuit 102. That is, the first energy storage circuit 102 releases energy to the first battery pack 11. Figure 19 The solid line with arrows shows the current path of the first energy storage circuit 102 charging the first battery pack 11.

[0132] like Figures 16 to 19 As shown, the first energy storage circuit 102 may include an inductor.

[0133] In some embodiments, a second capacitor C2 is connected in parallel across the two ends of the battery 100.

[0134] like Figure 16 As shown, the first upper bridge arm is turned on, the first lower bridge arm is turned off, and the second capacitor C2 forms a circuit with the second battery pack 12 through the first upper bridge arm and the inductor to charge the second battery pack 12. Figure 16 The dashed line with arrows shows the current path through which the second capacitor C2 charges the second battery pack 12.

[0135] It is worth noting that, such as Figure 13 As shown, during the period when the battery 100 is charging the first capacitor C1, the first upper bridge arm is turned on and the first 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 12 to charge the second battery pack 12.

[0136] like Figure 17 As shown, the first lower bridge arm is turned on, the first upper bridge arm is turned off, and the second capacitor C2 forms a circuit with the first battery pack 11 through the first lower bridge arm and the inductor, so that the first battery pack 11 charges the inductor. Figure 17 The dashed line with arrows shows the current path of the first battery pack 11 charging the second capacitor C2.

[0137] like Figure 18 As shown, the first lower bridge arm is turned on, the first upper bridge arm is turned off, and the second capacitor C2 forms a circuit with the first battery pack 11 through the first lower bridge arm and the inductor to charge the first battery pack 11. Figure 18 The dashed line with arrows shows the current path through which the second capacitor C2 charges the first battery pack 11.

[0138] like Figure 19As shown, the first upper bridge arm is turned on, the first lower bridge arm is turned off, and the second capacitor C2 forms a circuit with the second battery pack 12 through the first upper bridge arm and the inductor, so that the second battery pack 12 charges the inductor. Figure 19 The dashed line with an arrow shows the current path for the second battery pack 12 to charge the second capacitor C2.

[0139] In some embodiments, the first upper bridge arm switch V3 is equipped with a first freewheeling diode D1, and the first lower bridge arm switch V4 is equipped with a second freewheeling diode D2. When the first upper bridge arm switches from on to off, current can flow through the first freewheeling diode D1, ensuring a constant current flow in the inductor. Similarly, when the first upper bridge arm switches from off to on, current can flow through the second freewheeling diode D2. Thus, in the heating circuit, current always flows through the inductor, resulting in a smaller rate of change of the current through the inductor and a lower frequency of current flowing through the inductor. This improves the stability of the current in the circuit, thereby increasing the heating efficiency of the battery 100.

[0140] In some embodiments, the charging control circuit further includes a third switch K3 and a fourth switch K4. The first end of the third switch K3 is connected to the positive terminal of the battery 100, and the second end of the third switch K3 is connected to the first upper bridge arm, used to control the connection and disconnection between the positive terminal of the battery 100 and the first upper bridge arm. The first end of the fourth switch K4 is connected to the negative terminal of the battery 100, and the second end of the fourth switch K4 is connected to the first lower bridge arm, used to control the connection and disconnection between the negative terminal of the battery 100 and the first lower bridge arm. Thus, when the battery 100 needs to be heated, the connection between the battery 100 and the first bridge arm 23 can be controlled by 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 first bridge arm 23 can be controlled by the third switch K3 and the fourth switch K4, thereby not affecting the normal performance of the battery 100.

[0141] In some embodiments, the third switch K3 can be connected to the first upper bridge arm via the first connector 21, and the fourth switch K4 can be connected to the first lower bridge arm via the second connector 22.

[0142] 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.

[0143] 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 K3 to detect the current output by the battery 100, so as to facilitate the regulation of the current used in the charging control circuit.

[0144] In some embodiments, the third switch K3, the fourth switch K4, and the fifth switch K5 may include, but are not limited to, relays.

[0145] In the above technical solution, the structure of the first bridge arm 23 is simple and easy to control. While simplifying the circuit, it can improve the reliability of heating control of the battery 100.

[0146] like Figure 12 As shown, according to some embodiments of this application, there are multiple first bridge arms 23, and the multiple first bridge arms 23 are connected in parallel. The first energy storage circuit 102 includes multiple first inductors L1 connected in parallel, and the multiple first inductors L1 and the multiple first bridge arms 23 are connected in a one-to-one correspondence.

[0147] In some embodiments, the first switching circuit 101 may include a plurality of parallel first bridge arms 23, and the corresponding first energy storage circuit 102 includes a plurality of parallel first inductors L1, each of which is connected to a corresponding parallel first bridge arm 23. The plurality of parallel first bridge arms 23 may be three-phase bridge arms.

[0148] In some embodiments, the number of first bridge arms 23 is three, and the three first bridge arms 23 are multiplexed from the three-phase inductance of the motor. When the battery 100 is applied to an electrical device, the motor can be a motor in the electrical device. For example, the electrical device can be a vehicle, and the motor can be a motor in the vehicle. In this way, the multiple first bridge arms can reuse the three-phase bridge arms of the motor in the vehicle.

[0149] In the above technical solution, multiple first inductors L1 can suppress high-frequency noise in the circuit, making the current more stable and enhancing the self-heating effect of the battery 100.

[0150] According to some embodiments of this application, the first switching circuit 101 and the first energy storage circuit 102 are motors connected to the battery 100, the plurality of first bridge arms 23 are multi-phase bridge arms in the motor, and the plurality of first inductors L1 are motor windings in the motor.

[0151] In some embodiments, the plurality of first inductors L1 can be three-phase motor windings in a motor.

[0152] In some embodiments, the plurality of first bridge arms 23 may be three-phase bridge arms in a motor.

[0153] In some embodiments, when the battery 100 is applied to an electrical device, the motor can be a motor in the electrical device. For example, the electrical device can be a vehicle, and the motor can be a motor in the vehicle, so that multiple first inductors can reuse the three-phase inductance of the motor in the vehicle.

[0154] In the above technical solution, when heating the battery 100 in the electrical device, the existing motor in the electrical device can be used to heat the battery 100, reducing costs and keeping the weight of the electrical device relatively small.

[0155] According to some embodiments of this application, the first energy storage circuit 102 further includes a first inductor L2, which is connected in series with a plurality of first inductors L1 connected in parallel.

[0156] In some embodiments, 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 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.

[0157] In the above technical solution, by connecting the first inductor L2 in series, the amount of electricity stored in the first energy storage circuit 102 can be increased, thereby enhancing the self-heating effect of the battery 100.

[0158] This application provides a battery system that includes the battery charging control circuit described in the above embodiments.

[0159] The battery system includes a battery 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.

[0160] 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.

[0161] The electrical devices can be referred to the relevant descriptions in the above embodiments, and will not be repeated below.

[0162] This application provides a battery charging control circuit, referencing... Figure 12 The battery includes a first battery pack 11 and a second battery pack 12 connected in series, with the negative terminal of the first battery pack 11 connected to the positive terminal of the second battery pack 12. The charging control circuit includes a first switching circuit 101, a second switching circuit 105, a first energy storage circuit 102, and a voltage regulator circuit 104.

[0163] The first switching circuit 101 includes three parallel first bridge arms 23. Each first bridge arm 23 includes a first upper bridge arm and a first lower bridge arm. The first upper bridge arm is connected to the positive terminal of the first battery pack 11, and the first lower bridge arm is connected to the negative terminal of the second battery pack 12.

[0164] The second switching circuit 105 includes a second switch V2. The first energy storage circuit 102 includes three first inductors L1 connected in parallel. The first end of each first inductor L1 is connected to the node between the first upper bridge arm and the first lower bridge arm. The second end of each first inductor L1 is connected to the first end of the second switch V2. The second end of the second switch V2 is connected to the midpoint between the first battery pack 11 and the second battery pack 12. The second end of the first inductor L1 is also connected to the positive output terminal of the external energy device 103. The negative output terminal of the external energy device 103 is connected to the negative terminal of the second battery pack 12. The second end of the first inductor L1 is also connected to the first end of the voltage regulator circuit 104. The second end 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 V1 connected in series.

[0165] 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 charge control circuit for a battery, characterized by comprising: The battery includes a first battery pack and a second battery pack connected in series, and the charging control circuit includes: a first switch circuit including a first connection point, a second connection point and a third connection point connected to each other through a switching element; the first connection point is connected to the positive electrode of the battery, the second connection point is connected to the negative electrode of the battery, and the first connection point or the second connection point is also used to connect the first end of the external energy device; a second switch circuit, the first end of the second switch circuit is connected to the second end of the first energy storage circuit, and the second end of the second switch circuit is connected to the midpoint between the first battery pack and the second battery pack; a first energy storage circuit, the first end of the first energy storage circuit is connected to the third connection point, and the second end of the first energy storage circuit is used to be connected to the second end of the external energy device; The first switch circuit is configured to connect the first energy storage circuit and the external energy device to form a first charging loop, so that the external energy device can charge the first energy storage circuit, and connect the battery, the first energy storage circuit and the external energy device to form a second charging loop, so that the external energy device and the first energy storage circuit can jointly charge the battery.

2. The charge control circuit according to claim 1, characterized by The charging control circuit further includes a voltage stabilizing circuit, the voltage stabilizing circuit includes a first capacitor, the first end of the voltage stabilizing circuit is connected to the second end of the first energy storage circuit, and the second end of the voltage stabilizing circuit is connected to the first connection point or the second connection point, and the voltage stabilizing circuit is used to be connected between the first end and the second end of the energy device in parallel during charging the battery by the energy device.

3. The charge control circuit according to claim 1, characterized by The first switch circuit and the second switch circuit are configured to be able to connect the first energy storage circuit and the first battery pack / second battery pack to form a heating loop for the battery.

4. The charge control circuit according to claim 3, characterized by The charging control circuit further includes a voltage stabilizing circuit, the voltage stabilizing circuit includes: a first capacitor, a first switch connected in series with the first capacitor and connected between the second end of the first energy storage circuit and the first connection point / second connection point, and the voltage stabilizing circuit is used to be connected between the first end and the second end of the energy device in parallel during charging the battery by the energy device.

5. The charge control circuit according to claim 3, characterized by Further comprising: a second energy storage circuit, the first end of the second energy storage circuit is connected to the positive electrode of the battery, and the second end of the second energy storage circuit is connected to the negative electrode of the battery, The first switch circuit and the second switch circuit are configured to be able to connect the second energy storage circuit and the first battery pack or the second battery pack to form a heating loop for the battery.

6. The charge control circuit according to claim 5, characterized by The first energy storage circuit includes at least one inductor, and the second energy storage circuit includes a second capacitor.

7. The charging control circuit according to any one of claims 1 to 6, characterized by, The first switch circuit includes a first bridge arm, the first bridge arm includes a first upper bridge arm and a first lower bridge arm connected in series, the first upper bridge arm is connected to the first connection point, the first lower bridge arm is connected to the second connection point, and the node between the first upper bridge arm and the first lower bridge arm serves as the third connection point.

8. The charge control circuit according to claim 7, characterized by The number of the first bridge arms is multiple, the multiple first bridge arms are connected in parallel, the first energy storage circuit comprises multiple first inductors connected in parallel, and the multiple first inductors and the multiple first bridge arms are connected one by one.

9. The charge control circuit according to claim 8, characterized by The first switch circuit and the first energy storage circuit are a motor connected with the battery, the multiple first bridge arms are multiple-phase bridge arms in the motor, and the multiple first inductors are motor windings in the motor.

10. The charge control circuit according to claim 8 or 9, characterized by The first energy storage circuit further comprises: A second inductor connected in series with the multiple first inductors connected in parallel.

11. A battery system characterized by, The charging control circuit comprises any one of claims 1-10.

12. An electrical device, characterized by The battery system of claim 11 supplies power to the electrical device.

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