Energy storage power supply

Abstract

The utility model provides an energy storage power supply. The charging and discharging circuit comprises a buck-boost circuit, a charging interface, a discharging interface, a first switch piece and a second switch piece. The charging interface is connected with the buck-boost circuit; the discharge interface is connected with the buck-boost circuit; the first switch piece is located between the charging interface and the buck-boost circuit; the second switch piece is located between the discharge interface and the buck-boost circuit; under the condition that the charging interface is connected, the first switch piece is connected, and the second switch piece is disconnected; under the condition that the charging interface and the discharging interface are both connected, the first switch piece is connected, and the second switch piece is disconnected; and under the condition that the discharge interface is connected, the first switch piece is disconnected, and the second switch piece is connected. Thus, the charging function and the discharging function are achieved at the same time by sharing the buck-boost circuit and cooperating with charging and discharging control of the first switch part and the second switch part, compared with the mode that a charging circuit and a discharging circuit are independently arranged, the cost of the charging and discharging circuit is reduced, and therefore the cost of the energy storage power source is reduced.

Description

Technical Field

[0001] This application relates to the technical field of charging and discharging of energy storage power supplies, and particularly relates to an energy storage power supply. Background Art

[0002] Currently, the DC discharge interfaces of current portable energy storage products generally only have the discharge function. For example, USB A, TYPE-C, and car charger interfaces can only supply power and cannot charge the portable energy storage product reversely from the power supply port. DC charging requires an additional charging circuit to be designed and implemented from a dedicated charging port, which not only makes the circuit design relatively complex, but also increases the cost of the energy storage power supply due to the additional designed charging circuit. Summary of the Invention

[0003] An embodiment of this application provides an energy storage power supply.

[0004] An embodiment of this application provides a charging and discharging circuit. The charging and discharging circuit includes a buck-boost circuit, a charging interface, a discharging interface, a first switching element, and a second switching element. The charging interface is connected to the buck-boost circuit; the discharging interface is connected to the buck-boost circuit; the first switching element is located between the charging interface and the buck-boost circuit; the second switching element is located between the discharging interface and the buck-boost circuit;

[0005] When the charging interface is connected, the first switching element conducts and the second switching element disconnects; when both the charging interface and the discharging interface are connected, the first switching element conducts and the second switching element disconnects; when the discharging interface is connected, the first switching element disconnects and the second switching element conducts.

[0006] An embodiment of this application provides an energy storage power supply. The energy storage power supply includes a battery, the above-mentioned charging and discharging circuit, and a control chip. The charging and discharging circuit is connected to the battery; the control chip is connected to the charging and discharging circuit, and the control chip is configured to cooperate with the charging and discharging circuit to control the working conditions of the charging and discharging circuit.

[0007] In the charge and discharge circuit and energy storage power supply of the present application, both the charging interface and the discharging interface are connected to the same buck-boost circuit, that is, the charging interface and the discharging interface share the buck-boost circuit. Then, through the first switching element and the second switching element, the on-off states between the charging interface and the buck-boost circuit, and between the discharging interface and the buck-boost circuit are respectively controlled. When the charging interface is connected, the first switching element conducts and the second switching element disconnects, thereby realizing the charging function; when both the charging interface and the discharging interface are connected, the first switching element conducts and the second switching element disconnects, so as to preferentially realize the charging function while avoiding the conflict of simultaneous charging and discharging; when the discharging interface is connected, the first switching element disconnects and the second switching element conducts, thereby realizing the discharging function. In this way, by sharing the buck-boost circuit and cooperating with the charge and discharge control of the first switching element and the second switching element, the charging function and the discharging function are realized simultaneously. Compared with separately providing a charging circuit and a discharging circuit, at least two buck-boost circuits connected separately for the charging circuit and the discharging circuit, the number of buck-boost circuits is reduced, the cost of the charge and discharge circuit is reduced, and thus the cost of the energy storage power supply is reduced.

[0008] Additional aspects and advantages of the embodiments of the present application will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0010] Figure 1 is a schematic circuit structure diagram of the energy storage power supply of some embodiments of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0011] The embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the drawings, in which the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary only for explaining the embodiments of the present application and should not be construed as limiting the embodiments of the present application.

[0012] In the present application, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0013] In addition, the terms "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one feature. In the description of this application, "a plurality" means at least two, such as two or three, unless otherwise specifically defined.

[0014] Please refer to Figure 1 , the charge and discharge circuit of this application includes a buck-boost circuit, a charging interface, a discharging interface, a first switch, and a second switch. The charging interface is connected to the buck-boost circuit; the discharging interface is connected to the buck-boost circuit; the first switch is located between the charging interface and the buck-boost circuit; the second switch is located between the discharging interface and the buck-boost circuit;

[0015] When the charging interface is connected, the first switch conducts and the second switch disconnects; when both the charging interface and the discharging interface are connected, the first switch conducts and the second switch disconnects; when the discharging interface is connected, the first switch disconnects and the second switch conducts.

[0016] Among them, a DC-to-DC converter is a circuit or electromechanical device for power conversion that can convert a DC power supply into a DC (or approximate DC) power supply with a different voltage. Its power range can range from very small (small batteries) to very large (high-voltage power conversion).

[0017] DC-DC converters have various topologies, such as the three basic topologies of BUCK (step-down), BOOST (step-up), and BUCK-BOOST (buck-boost).

[0018] The BUCK circuit is a step-down circuit that achieves step-down output; the BOOST circuit is a step-up circuit that achieves step-up output.

[0019] The buck-boost circuit (such as Figure 1 the DC-DC BUCK-BOOST shown) includes both a step-down circuit and a step-up circuit and can output either step-down or step-up.

[0020] Among them, the charging interface is an interface for charging through an external power source (such as a public power grid, other energy storage power sources, etc.). The charging interface can be an MP8020 interface (such as Figure 1 the 8020 interface shown), a TYPE-C interface, etc.

[0021] MP8020 is an Ethernet Power over Ethernet (PoE) powered device (PD) interface that is compatible with IEEE802.3af / at / bt. The PD interface provides all IEEE802.3af / at / bt functions, including detection, event classification, and input current control. It also has a built-in 100V hot-swap MOSFET. The charging power when using the MP8020 interface for charging is greater than when using interfaces such as the TYPE-C interface, etc., which can meet the charging requirements of high power and achieve fast charging.

[0022] Among them, the discharge interface is an interface for supplying power to external devices. The discharge interface can be a car charger interface, a USB interface, a TYPE-C interface, etc. The car charger interface is an interface in an in-vehicle type energy storage power supply that specifically supplies power to the electronic components of a vehicle.

[0023] Optionally, the discharge interface is a car charger interface (such as Figure 1 the car charger interface shown), and the boost-buck circuit of the car charger interface is reused for the charging interface, thereby realizing the reuse of charging and discharging.

[0024] Optionally, both the charging interface and the discharge interface can include one or more. The interface types of multiple charging interfaces can be the same or different, and the interface types of multiple discharge interfaces can also be the same or different, which can be set according to actual needs. One or more charging interfaces and discharge interfaces are respectively connected to the boost-buck circuit.

[0025] Among them, the switch is used to control the on and off of the line where it is located. The operating conditions of the switch include the conducting state and the off state; for example, the first switch is on the line between the charging interface and the boost-buck circuit (such as Figure 1 the MOS located between the 8020 interface and the boost-buck circuit shown), when the first switch is conducting, the charging interface and the boost-buck circuit are conducting, and when the first switch is off, the charging interface and the boost-buck circuit are off; for example, the second switch is on the line between the discharge interface and the boost-buck circuit (such as Figure 1 the MOS located between the car charger interface and the boost-buck circuit shown), when the second switch is conducting, the discharge interface and the boost-buck circuit are conducting, and when the second switch is off, the discharge interface and the boost-buck circuit are off.

[0026] The switch can be a Field Effect Transistor (FET), simply called a field effect tube. There are mainly two types: junction FET (JFET) and metal-oxide semiconductor FET (abbreviated as MOS-FET).

[0027] Specifically, the buck-boost circuit, the first switching element, and the charging interface are connected in sequence to form a charging branch, and the buck-boost circuit, the second switching element, and the discharging interface are connected in sequence to form a discharging branch.

[0028] During charging, when the charging interface is connected (for example, when the power supply interface of an external power supply contacts the charging interface, it is determined that the charging interface is connected), the first switching element can be controlled to conduct and the second switching element to disconnect at this time. That is to say, the charging branch is conducted and the discharging branch is disconnected. At this time, the voltage input from the charging interface sequentially passes through the first switching element and the buck-boost circuit, and then enters the battery connected to the buck-boost circuit to achieve the charging function.

[0029] During discharging, when the discharging interface is connected (for example, when the charging interface of an external device contacts the discharging interface, it is determined that the discharging interface is connected), the first switching element can be controlled to disconnect and the second switching element to conduct at this time. That is to say, the discharging branch is conducted and the charging branch is disconnected. At this time, the voltage output from the battery is stepped up or down by the buck-boost circuit, and then passes through the second switching element and is output to the external device through the discharging interface to achieve the discharging function.

[0030] Since both the charging interface and the discharging interface are provided, but they share the same buck-boost circuit, it is difficult to discharge while charging. Therefore, when both the charging interface and the discharging interface are connected, the charging function is preferentially realized (that is, the first switching element conducts and the second switching element disconnects), which can avoid charging and discharging conflicts.

[0031] In the charge-discharge circuit of the embodiment of the present application, both the charging interface and the discharging interface are connected to the same buck-boost circuit, that is, the charging interface and the discharging interface share the buck-boost circuit. Then, through the first switching element and the second switching element, the on-off between the charging interface and the buck-boost circuit, and between the discharging interface and the buck-boost voltage are respectively controlled. When the charging interface is connected, the first switching element conducts and the second switching element disconnects, thereby realizing the charging function; when both the charging interface and the discharging interface are connected, the first switching element conducts and the second switching element disconnects, thereby preferentially realizing the charging function while avoiding simultaneous charge-discharge conflicts; when the discharging interface is connected, the first switching element disconnects and the second switching element conducts, thereby realizing the discharging function. In this way, by sharing the buck-boost circuit and cooperating with the charge-discharge control of the first switching element and the second switching element, the charging function and the discharging function are simultaneously realized. Compared with separately providing a charging circuit and a discharging circuit, at least two buck-boost circuits connected separately for the charging circuit and the discharging circuit, the number of buck-boost circuits is reduced, the cost of the charge-discharge circuit is reduced, and thus the cost of the energy storage power supply is reduced.

[0032] Please refer to Figure 1, in some embodiments, the charge and discharge circuit further includes a charging detection component. The charging detection component is connected between the first switching component and the charging interface to detect the voltage of the charging interface; when the voltage is greater than a preset threshold, the charging interface is turned on.

[0033] Among them, the charging detection component can be a detection resistor, and the detection resistor is connected to the charging detection point, and the charging detection point is located between the first switching component and the charging interface.

[0034] Specifically, when the charging interface is not turned on, the voltage of the charging detection point (such as Figure 1 the shown Vin) and the charging detection component is always at a low level (such as 0), and when the charging interface is turned on, the voltage of the charging detection point becomes a high level (such as greater than 0). At this time, there is a detection voltage across the two ends of the detection resistor. By obtaining the detection voltage of the detection resistor, the voltage of the charging interface can be determined. When the voltage of the charging interface is greater than a preset threshold (such as the preset threshold is greater than 0 and is an empirical value), it can be accurately determined that the charging interface is turned on.

[0035] Optionally, the charging detection component includes two detection resistors connected in sequence. One of the detection resistors (such as Figure 1 resistor 1 in Figure 1 ) is connected to the charging detection point, and the other detection resistor (such as resistor 2 in

[0036] ) is grounded, and the detection voltage is determined by collecting the voltage of any contact on the line between the two detection resistors. In this way, by using two detection resistors to achieve voltage division detection, the accuracy of the voltage detection of the charging interface can be improved.

[0037]

[0038] In some embodiments, the charge and discharge circuit further includes a discharging detection component. The discharging detection component is connected between the second switching component and the discharging interface to detect the voltage of the discharging interface; when the voltage is greater than a preset threshold, the discharging interface is turned on.

[0039] It can be understood that the preset threshold corresponding to the charging detection and the preset threshold corresponding to the discharging detection can be the same or different, and can be set according to actual requirements.

[0040] The energy storage power supply of the present application includes a battery, a control chip, and the charge-discharge circuit of any one of the above embodiments.

[0041] The battery is connected to the charge-discharge circuit. During discharging, the battery outputs current to the charge-discharge circuit, and the charge-discharge circuit supplies power to an external device through the discharge interface; during charging, the voltage output by an external power supply is output to the battery through the charge-discharge circuit.

[0042] The control chip (such as Figure 1 the MCU shown) is connected to the charge-discharge circuit, and the control chip can communicate with the charge-discharge circuit to achieve the working condition control of the charge-discharge circuit.

[0043] Among them, the working conditions of the charge-discharge circuit include a charging working condition, a discharging working condition, a stop charging working condition, a stop discharging working condition, etc.

[0044] Optionally, the control chip communicates with the buck-boost circuit of the charge-discharge circuit through a two-wire bidirectional synchronous serial bus (abbreviated as the I2C bus).

[0045] When the charging interface is connected or the control chip receives a charging instruction, the control chip communicates with the buck-boost circuit, so as to control the working condition of the charge-discharge circuit to switch to the charging working condition through the buck-boost circuit.

[0046] Among them, the control chip is connected to the charging detection component of the charge-discharge circuit to obtain the voltage collected by the charging detection component, so as to determine the voltage of the charging interface. Then, the control chip can determine whether the charging interface is connected according to whether the voltage of the charging interface is greater than the preset threshold.

[0047] When the charge-discharge circuit is in the charging working condition, the control chip communicates with the buck-boost circuit to control the first switching element to conduct and the second switching element to disconnect;

[0048] When the discharge interface is connected or the control chip receives a discharge instruction, the control chip communicates with the buck-boost circuit, so as to control the working condition of the charge-discharge circuit to switch to the discharging working condition through the buck-boost circuit.

[0049] Among them, the control chip can also be connected to the discharging detection component of the charge-discharge circuit to obtain the voltage collected by the discharging detection component, so as to determine the voltage of the discharge interface. Then, the control chip can determine whether the discharge interface is connected according to whether the voltage of the discharge interface is greater than the preset threshold.

[0050] When the charge-discharge circuit is in a discharge state, the control chip communicates with the buck-boost circuit to control the first switch to be disconnected and the second switch to be turned on.

[0051] It can be understood that when the control chip determines that both the charging interface and the discharging interface are connected, due to the shared buck-boost circuit, charging and discharging can only be achieved in time, and charging and discharging cannot be performed at the same time. Therefore, the operating condition of the charging and discharging circuit can be switched to the charging condition first, and priority is given to ensuring that the energy storage power supply has sufficient power.

[0052] Optionally, when the charging interface is connected or a charging instruction is received, the control chip switches the operating state of the charging and discharging circuit to the charging state and does not respond to the discharging instruction until the charging interface is no longer connected, and then responds to the discharging instruction, thereby avoiding simultaneous charging and discharging when charging and discharging multiplexing is realized.

[0053] Optionally, the discharge instruction can be provided by a discharge control button preset by the energy storage power supply (such as Figure 1 In the case 1) shown in the figure, the control chip is connected to the discharge control button. When the user presses the discharge control button, the control chip receives the discharge control instruction. The control chip controls the working condition of the charge and discharge circuit according to the discharge instruction.

[0054] The discharge control instruction includes a discharge instruction and a stop discharge instruction. When the discharge control button is pressed, the discharge control instruction switches between the discharge instruction and the stop discharge instruction. For example, when the user presses the discharge control button for the 2N-1th time, the discharge control instruction is the discharge instruction. When the user presses the discharge control button for the 2Nth time, the discharge control instruction is the stop discharge control instruction, and N is a positive integer.

[0055] When the control chip receives a discharge instruction, it can communicate with the buck-boost circuit to control the charge-discharge circuit to switch to a discharge condition, at which time the first switch is disconnected and the second switch is turned on. When the control chip receives a stop-discharge instruction, it can communicate with the buck-boost circuit to control the charge-discharge circuit to switch to a stop-discharge condition, at which time the second switch is disconnected.

[0056] In this way, discharge control can be achieved through the discharge control button, and since the frequency of use of the car charging interface is generally low, the cost of the discharge control button is lower than that of setting up a discharge detection component with higher cost to cooperate with the control chip to realize the connection detection of the discharge interface.

[0057] In some embodiments, the energy storage power supply further includes a communication module configured to receive charge and discharge control signals from a connected terminal, and the control chip is further configured to control at least one of the first switch and the second switch to switch to a target state through the buck-boost circuit, where the target state matches the charge and discharge control signals, and the target state includes being conductive or disconnected.

[0058] Among them, the communication module can be a wired communication module (such as achieving wired communication by connecting to the terminal through a data cable), or a wireless communication module (such as achieving wireless communication through a wifi communication module or a Bluetooth communication module, etc.).

[0059] Specifically, the communication module can communicate with the terminal in a wired or wireless manner, so as to obtain the charge and discharge control signals sent by the terminal (the user can generate charge and discharge control signals by operating the application on the terminal).

[0060] Among them, the charge and discharge control signals include at least one of a charging signal and a discharging signal.

[0061] When the control chip receives a charging signal, it controls the working condition of the charge and discharge circuit to switch to the charging working condition, that is, controls the first switch and the second switch to switch to the target state through the buck-boost circuit. At this time, the target state is that the first switch is conductive and the second switch is disconnected.

[0062] When the control chip receives a discharging signal, it controls the working condition of the charge and discharge circuit to switch to the discharging working condition, that is, controls the first switch and the second switch to switch to the target state through the buck-boost circuit. At this time, the target state is that the first switch is disconnected and the second switch is conductive.

[0063] Optionally, the charge and discharge control signals may further include a stop charging signal and a stop discharging signal.

[0064] When the control chip receives a stop charging signal, it controls the working condition of the charge and discharge circuit to switch to the stop charging working condition, that is, controls the first switch to switch to the target state through the buck-boost circuit. At this time, the target state is that the first switch is disconnected.

[0065] When the control chip receives a stop discharging signal, it controls the working condition of the charge and discharge circuit to switch to the stop discharging working condition, that is, controls the second switch to switch to the target state through the buck-boost circuit. At this time, the target state is that the second switch is disconnected.

[0066] In some embodiments, the control chip is further configured to:

[0067] When the charging interface is connected and the voltage of the charging interface is greater than a first preset voltage, control the buck-boost circuit to switch to a boost mode to boost the charging voltage to the first preset voltage, where the first preset voltage is determined according to the functional parameters of the battery;

[0068] When the charging interface is connected and the voltage of the charging interface is less than the first preset voltage, control the buck-boost circuit to switch to a buck mode to reduce the charging voltage to the first preset voltage.

[0069] Specifically, when the charge-discharge circuit is in a charging condition, due to different specifications of external power supplies, the charging voltage is also different. Therefore, when the control chip detects the voltage of the charging interface, it can determine whether the voltage of the charging interface is greater than the first preset voltage (such as determined according to the rated charging voltage of the battery) to determine whether to boost or buck the voltage input to the battery.

[0070] If the voltage of the charging interface is greater than (or equal to) the first preset voltage, it is necessary to buck the charging voltage. At this time, the control chip can communicate with the buck-boost circuit to control the buck-boost circuit to work in a buck mode to buck the charging voltage to the first preset voltage, thereby ensuring charging safety and extending the battery life.

[0071] If the voltage of the charging interface is less than (or equal to) the first preset voltage, it is necessary to boost the charging voltage. At this time, the control chip can communicate with the buck-boost circuit to control the buck-boost circuit to work in a boost mode to boost the charging voltage to the first preset voltage, thereby ensuring charging safety and extending the battery life.

[0072] In some embodiments, the control chip is further configured to:

[0073] When the discharge interface is connected, control the buck-boost circuit to switch to a buck mode to reduce the discharge voltage to a second preset voltage.

[0074] Specifically, when the vehicle charger interface is discharging, the supply voltage required by the electronic components of the vehicle is generally less than the rated discharge voltage of the battery of the energy storage power supply. Therefore, when the charge-discharge circuit is in a discharging condition, it is generally necessary to buck the discharge voltage. At this time, the control chip can control the buck-boost circuit to switch to a buck mode to reduce the discharge voltage to the second preset voltage (the second preset voltage is the supply voltage required by the electronic components of the vehicle).

[0075] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials, or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of the present application. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiments or examples. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples.

[0076] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present application.

Claims

1. An energy storage power supply, characterized in that, Comprising: A battery; A charge and discharge circuit, which is connected to the battery; And A control chip, which is connected to the charge and discharge circuit, and the control chip is configured to control the operating conditions of the charge and discharge circuit; Wherein, the charge and discharge circuit includes: A buck-boost circuit; A charging interface, which is connected to the buck-boost circuit; A discharging interface, which is connected to the buck-boost circuit; A first switch element, which is located between the charging interface and the buck-boost circuit; A second switch element, which is located between the discharging interface and the buck-boost circuit; When the charging interface is connected, the first switch element conducts and the second switch element disconnects; when both the charging interface and the discharging interface are connected, the first switch element conducts and the second switch element disconnects; when the discharging interface is connected, the first switch element disconnects and the second switch element conducts; A charging detection component, which includes two detection resistors connected in sequence, one of the detection resistors is connected to a charging detection point, and the other detection resistor is grounded, and the charging detection point is located between the first switch element and the charging interface.

2. The energy storage power supply according to claim 1, characterized in that, Further comprising: The charging detection component is used to detect the voltage of the charging interface, and when the voltage is greater than a preset threshold, the charging interface is connected.

3. The energy storage power supply according to claim 1, characterized in that Further comprising: A discharging detection component, which is connected between the second switch element and the discharging interface to detect the voltage of the discharging interface; When the voltage is greater than a preset threshold, the discharging interface is connected.

4. The energy storage power supply according to claim 1, wherein The control chip is connected to the charging detection component of the charge and discharge circuit to obtain the voltage collected by the charging detection component.

5. The energy storage power supply according to claim 1, characterized in that, Further comprising a discharging control button, which is connected to the control chip, and when the discharging control button is pressed, the operating conditions of the charge and discharge circuit are switched to a discharging operating condition or a stop discharging operating condition; When the charge and discharge circuit is in the discharging operating condition, the first switch element disconnects and the second switch element conducts; When the charge and discharge circuit is in the stop discharging operating condition, the second switch element disconnects.

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