Charge and discharge control circuit, system, control board and battery system

Abstract

This utility model discloses a charging and discharging control circuit, system, control board, and battery system. The charging and discharging control circuit includes a first switching circuit for connecting a secondary battery module, a charging and discharging interface, and a charging interface, and for turning on or off the charging and discharging interface and the secondary battery module, and / or turning on or off the charging interface and the secondary battery module. A second switching circuit is connected to the charging and discharging interface and the secondary battery module to cooperate with the second switching circuit to achieve synchronous charging and discharging. A main control circuit is connected to the secondary battery module, the charging and discharging interface, the charging interface, the first switching circuit, and the second switching circuit, and is used to control the operation of the first switching circuit and the second switching circuit according to the battery information of the secondary battery module, the charging and discharging information of the charging and discharging interface, and the charging information of the charging interface, thereby achieving multi-interface charging while meeting the requirements of synchronous charging and discharging.

Description

Technical Field

[0001] This utility model relates to the field of charging and discharging technology, and in particular to a charging and discharging control circuit, system, control board and battery system. Background Technology

[0002] The rechargeable battery to dry cell battery chip is a power management chip specifically designed for rechargeable battery to dry cell battery applications. Its core functions include step-down conversion, charging management, battery status monitoring, and simulating the power characteristics of dry cell batteries.

[0003] like Figure 1 The image shows an existing secondary battery to dry cell battery, which includes a casing, positive and negative terminals on the casing, and a control board and electrolyte inside the casing. It mainly uses the same-port charging and discharging method, supports only a single charging method, and cannot achieve synchronous charging and discharging. Utility Model Content

[0004] This utility model provides a charging and discharging control circuit, system, control board, and battery system to solve the problem that existing secondary battery to dry cell batteries only support a single charging method and cannot achieve synchronous charging and discharging.

[0005] A charging and discharging control circuit includes a first switching circuit, a second switching circuit, and a main control circuit;

[0006] The first switching circuit is used to connect the secondary battery module, the charging / discharging interface, and the charging interface, and is used to turn on or off the charging / discharging interface and the secondary battery module, and / or to turn on or off the charging interface and the secondary battery module;

[0007] The second switching circuit is used to connect the charging / discharging interface and the secondary battery module, and is used to turn the charging / discharging interface and the secondary battery module on or off.

[0008] The main control circuit is connected to the secondary battery module, the charging and discharging interface, the charging interface, the first switch circuit, and the second switch circuit, and is used to control the first switch circuit and the second switch circuit to work according to the battery information of the secondary battery module, the charging and discharging information of the charging and discharging interface, and the charging information of the charging interface.

[0009] Furthermore, the first switching circuit includes a first transistor and a second transistor;

[0010] The first terminal of the first transistor is connected to the charging and discharging interface, the second terminal of the first transistor is connected to the secondary battery module, and the third terminal of the first transistor is connected to the main control circuit.

[0011] The first terminal of the second transistor is connected to the charging interface, the second terminal of the second transistor is connected to the secondary battery module, and the third terminal of the second transistor is connected to the main control circuit.

[0012] Furthermore, the second switching circuit includes a third transistor;

[0013] The first terminal of the third transistor is connected to the charging and discharging interface, the second terminal of the third transistor is connected to the secondary battery module, and the third terminal of the third transistor is connected to the main control circuit.

[0014] Furthermore, the main control circuit includes a power management unit.

[0015] A charging and discharging control system includes a charging and discharging interface, a charging interface, a voltage conversion circuit, and the aforementioned charging and discharging control circuit.

[0016] The charging and discharging interface is connected to the first switching circuit and the second switching circuit, and is used to connect the first charging device and the electrical load.

[0017] The charging interface is connected to the first switching circuit and is used to connect to the second charging device;

[0018] The voltage conversion circuit is connected to the second switching circuit and the secondary battery module, and is used to convert the battery voltage output by the secondary battery module when the second switching circuit is turned on, and output the converted voltage to the charging and discharging interface.

[0019] Furthermore, the charging interface includes a USB Type-C interface.

[0020] Furthermore, the voltage conversion circuit includes a Buck circuit.

[0021] A charge / discharge control board includes a substrate and the aforementioned charge / discharge control system; the charge / discharge control system is disposed on the substrate.

[0022] A battery system includes a secondary battery module and the aforementioned charge / discharge control board;

[0023] The secondary battery module is connected to the charge / discharge control board.

[0024] Furthermore, the secondary battery module includes a lithium-ion battery module or a sodium-ion battery module.

[0025] This utility model provides a charging and discharging control circuit, system, control board, and battery system. The charging and discharging control circuit includes a first switching circuit, a second switching circuit, and a main control circuit. By connecting the first switching circuit to the secondary battery module, the charging and discharging interface, and the charging interface, it is used to turn the charging and discharging interface and the secondary battery module on or off, and / or turn the charging interface and the secondary battery module on or off, to achieve multi-interface charging. The second switching circuit is connected to the charging and discharging interface and the secondary battery module, and is used to turn the charging and discharging interface and the secondary battery module on or off, so as to cooperate with the second switching circuit to achieve synchronous charging and discharging. The main control circuit is connected to the secondary battery module, the charging and discharging interface, the charging interface, the first switching circuit, and the second switching circuit, and is used to control the operation of the first switching circuit and the second switching circuit according to the battery information of the secondary battery module, the charging and discharging information of the charging and discharging interface, and the charging information of the charging interface, so as to achieve multi-interface charging while meeting the requirements of synchronous charging and discharging. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of a secondary battery to dry cell conversion in the background technology of this utility model;

[0028] Figure 2 This is a schematic diagram of a charging and discharging control system in one embodiment of the present invention.

[0029] In the diagram: 1. Charging / discharging interface; 2. Charging interface; 3. Voltage conversion circuit; 4. Charging / discharging control circuit; 41. First switch circuit; 42. Second switch circuit; 43. Main control circuit; 5. Secondary battery module. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model.

[0031] It should be understood that this invention can be embodied in various forms and should not be construed as being limited to the embodiments set forth herein. Rather, providing these embodiments will make the disclosure thorough and complete, and will fully convey the scope of this invention to those skilled in the art. In the drawings, for clarity, the dimensions of layers and regions, as well as their relative dimensions, may be exaggerated. The same reference numerals denote the same elements throughout.

[0032] It should be understood that when an element or layer is referred to as "on," "adjacent to," "connected to," or "coupled to" other elements or layers, it may be directly on, adjacent to, connected to, or coupled to other elements or layers, or there may be intervening elements or layers. Conversely, when an element is referred to as "directly on," "directly adjacent to," "directly connected to," or "directly coupled to" other elements or layers, there are no intervening elements or layers. It should be understood that although the terms first, second, third, etc., may be used to describe various elements, components, areas, layers, and / or portions, these elements, components, areas, layers, and / or portions should not be limited by these terms. These terms are only used to distinguish one element, component, area, layer, or portion from another element, component, area, layer, or portion. Therefore, without departing from the teachings of this utility model, the first element, component, area, layer, or portion discussed below may be referred to as the second element, component, area, layer, or portion.

[0033] Spatial relation terms such as “below,” “under,” “below,” “under,” “above,” “above,” etc., are used herein for convenience of description to describe the relationship between one element or feature shown in the figure and other elements or features. It should be understood that, in addition to the orientation shown in the figure, spatial relation terms are intended to also include different orientations of the device in use and operation. For example, if the device in the figure is flipped, then the element or feature described as “below,” “under,” or “below” other elements or features will be oriented “above” other elements or features. Therefore, the exemplary terms “below” and “under” can include both above and below orientations. The device may be otherwise oriented (rotated 90 degrees or otherwise) and the spatial descriptive terms used herein will be interpreted accordingly.

[0034] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. When used herein, the singular forms “a,” “an,” and “ / the” are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising” and / or “comprising,” when used in this specification, identify the presence of features, integers, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups. When used herein, the term “and / or” includes any and all combinations of the associated listed items.

[0035] To fully understand this utility model, detailed structures and steps will be presented in the following description to illustrate the technical solution proposed by this utility model. Preferred embodiments of this utility model are described in detail below; however, in addition to these detailed descriptions, this utility model may have other embodiments.

[0036] This embodiment provides a charge / discharge control circuit 4, applied in a battery system. Exemplarily, the battery system is disposed within a secondary battery-to-dry cell, which includes a casing and the battery system itself. The battery system includes a secondary battery module 5 and a charge / discharge control board. The secondary battery module 5 and the charge / discharge control board are disposed within the casing.

[0037] Optionally, the charge / discharge control board includes a substrate and a charge / discharge control system; such as Figure 2 As shown, the charge / discharge control system is mounted on the substrate. Understandably, this charge / discharge control system can also be integrated into a charge / discharge control chip. The substrate is preferably a PCB board.

[0038] As an example, the charging and discharging control system includes a charging and discharging interface 1, a charging interface 2, a voltage conversion circuit 3, and the aforementioned charging and discharging control circuit 4. Exemplarily, the charging and discharging control circuit 4 is connected to the charging and discharging interface 1, the charging interface 2, and the secondary battery module 5 to realize simultaneous charging and discharging and separate charging and discharging of the secondary battery module 5.

[0039] In this context, "same-port charging and discharging" refers to charging and discharging the secondary battery module 5 solely through charging and discharging interface 1. "Separate-port charging and discharging" refers to charging the secondary battery module 5 through charging interface 2 and discharging it through charging and discharging interface 1. Understandably, during separate-port charging and discharging, charging can be performed solely through charging interface 2, and discharging can be performed solely through charging and discharging through charging and discharging interface 1, or simultaneously through charging interface 2 and charging and discharging interface 1.

[0040] The charging / discharging interface 1 is used to connect a first charging device and an electrical load. The first charging device can be a battery system charging dock. The electrical load is an electronic device that powers the battery system. The charging interface 2 is used to connect a second charging device. The second charging device can be a charger.

[0041] The voltage conversion circuit 3 is used to convert the battery voltage output by the secondary battery module 5 and send the converted voltage to the charging and discharging interface 1 to supply power to the electrical load.

[0042] This embodiment provides a charge / discharge control circuit 4, such as Figure 2As shown, the circuit includes a first switch circuit 41, a second switch circuit 42, and a main control circuit 43. The first switch circuit 41 is used to connect the secondary battery module 5, the charging / discharging interface 1, and the charging interface 2, and is used to turn the charging / discharging interface 1 and the secondary battery module 5 on or off, and / or, to turn the charging interface 2 and the secondary battery module 5 on or off. The second switch circuit 42 is used to connect the charging / discharging interface 1 and the secondary battery module 5, and is used to turn the charging / discharging interface 1 and the secondary battery module 5 on or off. The main control circuit 43 is connected to the secondary battery module 5, the charging / discharging interface 1, the charging interface 2, the first switch circuit 41, and the second switch circuit 42, and is used to control the operation of the first switch circuit 41 and the second switch circuit 42 according to the battery information of the secondary battery module 5, the charging / discharging information of the charging / discharging interface 1, and the charging information of the charging interface 2.

[0043] As an example, when the secondary battery module 5 is charging, the first switch circuit 41 connects the charging / discharging interface 1 and the secondary battery module 5, and the second switch circuit 42 disconnects the charging / discharging interface 1 and the secondary battery module 5, allowing the secondary battery module 5 to charge. When the secondary battery module 5 is discharging, the first switch circuit 41 disconnects the charging / discharging interface 1 and the secondary battery module 5, and the second switch circuit 42 connects the charging / discharging interface 1 and the secondary battery module 5, allowing the secondary battery module 5 to discharge. The voltage conversion circuit 3 converts the battery voltage output by the secondary battery module 5 and sends the converted voltage to the charging / discharging interface 1 to supply power to the electrical load.

[0044] As another example, when charging and discharging at separate ports, if the secondary battery module 5 is charging, the first switching circuit 41 connects the charging port 2 and the secondary battery module 5, and disconnects the charging / discharging port 1 and the secondary battery module 5; the second switching circuit 42 disconnects the charging / discharging port 1 and the secondary battery module 5. When the secondary battery module 5 is discharging, the first switching circuit 41 disconnects the charging port 2 and the secondary battery module 5, and the second switching circuit 42 connects the charging / discharging port 1 and the secondary battery module 5. When the secondary battery module 5 is simultaneously charging and discharging, the first switching circuit 41 connects the charging port 2 and the secondary battery module 5, disconnects the charging / discharging port 1 and the secondary battery module 5, and the second switching circuit 42 connects the charging / discharging port 1 and the secondary battery module 5.

[0045] As an example, the main control circuit 43 can determine whether to perform simultaneous charging / discharging or separate charging / discharging based on the battery information of the secondary battery module 5, the charging / discharging information of the charging / discharging interface 1, and the charging information of the charging interface 2, thereby controlling the operation of the first switching circuit 41 and the second switching circuit 42. Exemplarily, the battery information includes the battery voltage of the secondary battery module 5. The charging / discharging information includes the first charging device access information and the electrical load access information. The charging information includes the second charging device access information. The main control circuit 43 determines whether to perform simultaneous charging / discharging or separate charging / discharging based on the first charging device access information, the electrical load access information, and the second charging device access information. Based on the battery voltage, it determines whether the secondary battery module 5 should be charged or discharged.

[0046] For example, when the second charging device connected is a TYPE-C charger, the main control circuit 43 detects the input voltage of the charging interface 2 and controls the first switching circuit 41 to turn on the charging interface 2 and the secondary battery module 5 to charge the secondary battery module 5. If the electrical load is connected to the charging / discharging interface 1 at this time, and the battery voltage is greater than 3V, the second switching circuit 42 is simultaneously controlled to turn on the charging / discharging interface 1 and the secondary battery module 5. After the secondary battery module 5 is fully charged, the first switching circuit 41 is controlled to disconnect the charging interface 2 and the secondary battery module 5, while the second switching circuit 42 remains on until the battery voltage drops below 3V, thereby achieving synchronous charging and discharging.

[0047] In this embodiment, the charge / discharge control circuit 4 includes a first switch circuit 41, a second switch circuit 42, and a main control circuit 43. The first switch circuit 41 is connected to the secondary battery module 5, the charge / discharge interface 1, and the charging interface 2 to enable or disable the charge / discharge interface 1 and the secondary battery module 5, and / or enable or disable the charging interface 2 and the secondary battery module 5, thereby achieving multi-interface charging. The second switch circuit 42 is connected to the charge / discharge interface 1 and the secondary battery module 5 to enable or disable the charge / discharge interface 1 and the secondary battery module 5, thus cooperating with the second switch circuit 42 to achieve synchronous charging and discharging. The main control circuit 43 is connected to the secondary battery module 5, the charge / discharge interface 1, the charging interface 2, the first switch circuit 41, and the second switch circuit 42. It controls the operation of the first switch circuit 41 and the second switch circuit 42 based on the battery information of the secondary battery module 5, the charge / discharge information of the charge / discharge interface 1, and the charging information of the charging interface 2, thereby achieving multi-interface charging while meeting the requirements of synchronous charging and discharging.

[0048] In one embodiment, the first switching circuit 41 includes a first transistor Q1 and a second transistor Q2; the first terminal of the first transistor Q1 is connected to the charging / discharging interface 1, the second terminal of the first transistor Q1 is connected to the secondary battery module 5, and the third terminal of the first transistor Q1 is connected to the main control circuit 43; the first terminal of the second transistor Q2 is connected to the charging interface 2, the second terminal of the second transistor Q2 is connected to the secondary battery module 5, and the third terminal of the second transistor Q2 is connected to the main control circuit 43.

[0049] Optionally, the first transistor Q1 and the second transistor Q2 can be field-effect transistors, bipolar junction transistors, or insulated gate bipolar transistors.

[0050] As an example, the first transistor Q1 and the second transistor Q2 are metal-oxide-semiconductor field-effect transistors (MOSFETs) to ensure a fast switching speed. Exemplarily, the first terminal of the first transistor Q1 is the source, the second terminal is the drain, and the third terminal is the gate. The first terminal of the second transistor Q2 is the source, the second terminal is the drain, and the third terminal is the gate. The main control circuit 43 is connected to the gates of the first transistor Q1 and the second transistor Q2 respectively to control the first transistor Q1 and the second transistor Q2 to be turned on or off.

[0051] In this embodiment, a first switching circuit 41 is formed by the first transistor Q1 and the second transistor Q2. The circuit structure is simple, the cost is low, and the switching response speed is fast.

[0052] In one embodiment, the second switching circuit 42 includes a third transistor Q3; the first terminal of the third transistor Q3 is connected to the charging / discharging interface 1, the second terminal of the third transistor Q3 is connected to the secondary battery module 5, and the third terminal of the third transistor Q3 is connected to the main control circuit 43.

[0053] Optionally, the third transistor Q3 can be a field-effect transistor, a bipolar junction transistor (BJT), or an insulated-gate bipolar transistor (IGBT). As an example, the third transistor Q3 is a metal-oxide-semiconductor field-effect transistor (MOSFET) to ensure a faster switching speed. Exemplarily, the first terminal of the third transistor Q3 is the source, the second terminal is the drain, and the third terminal is the gate. The main control circuit 43 is connected to the gate of the third transistor Q3 to control the third transistor Q3 to turn on or off.

[0054] In this embodiment, the second switching circuit 42 is formed by the third transistor Q3. The circuit structure is simple, the cost is low, and the switching response speed is fast.

[0055] In one embodiment, the main control circuit 43 includes a power management unit (PMU). The power management unit provides unified, efficient, and intelligent management of the power supply to the charging / discharging interface 1 and the charging interface 2, ensuring stable system operation and optimizing energy consumption.

[0056] This embodiment provides a charging and discharging control system, including a charging and discharging interface 1, a charging interface 2, a voltage conversion circuit 3, and the aforementioned charging and discharging control circuit 4; the charging and discharging interface 1 is connected to a first switching circuit 41 and a second switching circuit 42, and is used to connect a first charging device and an electrical load; the charging interface 2 is connected to the first switching circuit 41, and is used to connect a second charging device; the voltage conversion circuit 3 is connected to the second switching circuit 42 and a secondary battery module 5, and is used to convert the battery voltage output by the secondary battery module 5 when the second switching circuit 42 is turned on, and output the converted voltage to the charging and discharging interface 1.

[0057] In one embodiment, the charging interface 2 includes a USB Type-C interface, which facilitates charging and improves charging capability.

[0058] In one embodiment, the voltage conversion circuit 3 includes a Buck circuit. In this embodiment, the Buck circuit steps down the battery voltage output from the secondary battery module 5, converts the output voltage to a voltage that is then sent to the charge / discharge interface 1 to supply power to the electrical load, thereby ensuring that the output battery conversion voltage meets the discharge curve of the dry cell battery.

[0059] This embodiment provides a charge / discharge control board, including a substrate and the aforementioned charge / discharge control system; the charge / discharge control system is disposed on the substrate.

[0060] This embodiment provides a battery system, including a secondary battery module 5 and the aforementioned charge / discharge control board; the secondary battery module 5 is connected to the charge / discharge control board.

[0061] In one embodiment, the secondary battery module 5 includes a lithium-ion battery module or a sodium-ion battery module to accommodate different types of battery cells.

[0062] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model 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 of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, and should all be included within the protection scope of this utility model.

Claims

1. A charging and discharging control circuit, characterized in that, It includes a first switching circuit, a second switching circuit, and a main control circuit; The first switching circuit is used to connect the secondary battery module, the charging / discharging interface, and the charging interface, and is used to turn on or off the charging / discharging interface and the secondary battery module, and / or to turn on or off the charging interface and the secondary battery module; The second switching circuit is used to connect the charging / discharging interface and the secondary battery module, and is used to turn the charging / discharging interface and the secondary battery module on or off. The main control circuit is connected to the secondary battery module, the charging and discharging interface, the charging interface, the first switch circuit, and the second switch circuit, and is used to control the first switch circuit and the second switch circuit to work according to the battery information of the secondary battery module, the charging and discharging information of the charging and discharging interface, and the charging information of the charging interface.

2. The charging and discharging control circuit as described in claim 1, characterized in that, The first switching circuit includes a first transistor and a second transistor; The first terminal of the first transistor is connected to the charging and discharging interface, the second terminal of the first transistor is connected to the secondary battery module, and the third terminal of the first transistor is connected to the main control circuit. The first terminal of the second transistor is connected to the charging interface, the second terminal of the second transistor is connected to the secondary battery module, and the third terminal of the second transistor is connected to the main control circuit.

3. The charging and discharging control circuit as described in claim 1, characterized in that, The second switching circuit includes a third transistor; The first terminal of the third transistor is connected to the charging and discharging interface, the second terminal of the third transistor is connected to the secondary battery module, and the third terminal of the third transistor is connected to the main control circuit.

4. The charging and discharging control circuit as described in claim 1, characterized in that, The main control circuit includes a power management unit.

5. A charging and discharging control system, characterized in that, It includes a charging / discharging interface, a charging interface, a voltage conversion circuit, and a charging / discharging control circuit as described in any one of claims 1 to 4; The charging and discharging interface is connected to the first switching circuit and the second switching circuit, and is used to connect the first charging device and the electrical load. The charging interface is connected to the first switching circuit and is used to connect to the second charging device; The voltage conversion circuit is connected to the second switching circuit and the secondary battery module, and is used to convert the battery voltage output by the secondary battery module when the second switching circuit is turned on, and output the converted voltage to the charging and discharging interface.

6. The charging and discharging control system as described in claim 5, characterized in that, The charging interface includes a USB Type-C interface.

7. The charging and discharging control system as described in claim 5, characterized in that, The voltage conversion circuit includes a Buck circuit.

8. A charge / discharge control board, characterized in that, It includes a substrate and a charge / discharge control system as described in any one of claims 5 to 7; the charge / discharge control system is disposed on the substrate.

9. A battery system, characterized in that, Includes a secondary battery module and a charge / discharge control board as described in claim 8; The secondary battery module is connected to the charge / discharge control board.

10. The battery system as claimed in claim 9, characterized in that, The secondary battery module includes a lithium-ion battery module or a sodium-ion battery module.

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