Power management device, battery device and electric equipment

Abstract

The utility model discloses a power management device, a battery device and electric equipment. The power management device is used for controlling a load power supply system, the load power supply system comprises a main power supply path for supplying power to a load through a first relay and a pre-charging path for performing pre-charging protection on the main power supply path, and the power management device comprises a control unit, a first power supply path and a detection unit, the first power supply path is electrically connected with the power supply and the first relay and is used for supplying power to the first relay under the control of the control unit so as to control the first relay to be closed; the detection unit is electrically connected with the control unit and the first power supply path and is used for detecting the power supply voltage on the first power supply path in the power supply process of the main power supply path; and the control unit is used for controlling the pre-charging path to perform pre-charging protection on the main power supply path in response to the condition that the power supply voltage is lower than or equal to the preset reference voltage. Therefore, the on-load adhesion of the first relay caused by overlarge current can be relieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a power management device, a battery device and an electric equipment. BACKGROUND

[0002] Energy conservation and emission reduction is the key to sustainable development, which promotes the adjustment of energy structure and the development and application of battery technology. The key to the development of battery technology lies in electrochemical energy storage technology, which has been widely used in portable electronics, electric vehicles and energy storage systems due to its high energy density, good cycle ability, high working voltage, environmental protection and low self-discharge.

[0003] The power supply system of the battery often selectively supplies power to the load through the closing and opening of the relay. Specifically, the relay generally includes a control loop and a controlled loop, the control loop is connected to the power management device, and the controlled loop is arranged in the above power supply system. The power management device selectively supplies power to the control loop of the relay to realize the closing and opening of the controlled loop, thereby realizing the purpose of "small current" controlling "large current". However, during the process of the power management device supplying power to the relay, if the voltage abnormally drops, the relay will abnormally open and re-close, and the current acting on the relay will be too large to cause load sticking. CONTENT OF THE UTILITY MODEL

[0004] The main purpose of the present application is to provide a power management device, a battery device and an electric equipment, which aims to solve the above technical problems existing in the prior art.

[0005] In order to solve the above problems, the present application provides a power management device, which is used for controlling a load power supply system, the load power supply system includes a main power supply path for supplying power to a load via a first relay and a pre-charging path for pre-charging protection of the main power supply path, the power management device includes a control unit, a first power supply path and a detection unit, the first power supply path is electrically connected to a power supply and the first relay, and is used for supplying power to the first relay under the control of the control unit, thereby controlling the first relay to close; the detection unit is electrically connected to the control unit and the first power supply path, and is used for detecting the power supply voltage on the first power supply path during the power supply process of the main power supply path; the control unit is used for controlling the pre-charging path to pre-charge the main power supply path in response to the power supply voltage being lower than or equal to a preset reference voltage. Thus, the control unit controls the pre-charging path to pre-charge the main power supply path in response to the power supply voltage being lower than or equal to the preset reference voltage, which can alleviate the load sticking caused by the first relay due to the excessive current of the first relay after the abnormal opening and re-closing of the first relay caused by the drop of the power supply voltage of the first power supply path.

[0006] In some embodiments, the control unit comprises a timing module configured to time a duration that the supply voltage is lower than or equal to the reference voltage, and the control unit is configured to control the pre-charge path to pre-charge protect the main supply path in response to the duration that the supply voltage is lower than or equal to the reference voltage being greater than or equal to a preset time threshold. In this way, the pre-charge path is controlled to pre-charge protect the main supply path when the duration that the supply voltage is lower than or equal to the reference voltage is greater than or equal to the preset time threshold, which effectively alleviates the invalid protection of pre-charge discharge.

[0007] In some embodiments, the first supply path comprises a driving unit, an input terminal of the driving unit is electrically connected to the power supply, an output terminal of the driving unit is electrically connected to the first relay, a control terminal of the driving unit is electrically connected to the control unit, and the detection unit is electrically connected to the input terminal of the driving unit and configured to detect the supply voltage at the input terminal of the driving unit. In this way, the detection unit is used to detect the supply voltage at the input terminal of the driving unit, which can more accurately detect the voltage drop on the first supply path and quickly respond to the voltage drop.

[0008] In some embodiments, the detection unit comprises a comparator, a first input terminal of the comparator is electrically connected to the first supply path to receive the supply voltage, a second input terminal of the comparator receives the reference voltage, and an output terminal of the comparator is electrically connected to the control unit. In this way, the comparator is used to receive the supply voltage and the reference voltage respectively, which can quickly detect the voltage drop on the first supply path and quickly respond to the voltage drop.

[0009] In some embodiments, the comparator is configured to output a first signal in response to the voltage being equal to or lower than the reference voltage, the control unit comprises a timing module configured to time a duration of the first signal, and the control unit is configured to control the pre-charge path to pre-charge protect the main supply path in response to the duration of the first signal being greater than or equal to a preset time threshold. In this way, the timing module is used to time the duration of the first signal in combination with the first signal output by the comparator to control the pre-charge path to pre-charge protect the main supply path, which effectively alleviates the invalid protection of pre-charge discharge.

[0010] In some embodiments, the detection unit further comprises a voltage follower, an input terminal of the voltage follower is electrically connected to an output terminal of the comparator, and an output terminal of the voltage follower is electrically connected to the control unit. In this way, the impedance of the input terminal and the output terminal of the voltage follower is used to improve the driving capability of the comparator.

[0011] In some embodiments, the detection unit further comprises a flip-flop, an input end of the flip-flop is electrically connected to an output end of the comparator, an output end of the flip-flop is electrically connected to the control unit, and a control end of the flip-flop is configured to receive a trigger signal. In this way, the input end of the flip-flop is electrically connected to the output end of the comparator, the output end of the flip-flop is electrically connected to the control unit, and the control end of the flip-flop is configured to receive the trigger signal, so that the trigger signal of the flip-flop can be used to control the control timing of the output result of the comparator to the control unit, thereby improving reliability and anti-interference capability.

[0012] In some embodiments, the power management device further comprises an energy storage unit, the energy storage unit is electrically connected to the first power supply path, and the energy storage unit is configured to store the electric energy of the power supply and provide electric energy for the first power supply path when the power supply abnormally supplies power to the first power supply path. In this way, the energy storage unit is configured to store the electric energy of the power supply and provide electric energy for the first power supply path when the power supply abnormally supplies power to the first power supply path, so that the first relay can be delayed to be disconnected by the energy storage unit, thereby improving reliability.

[0013] In some embodiments, the first power supply path comprises a driving unit, an input end of the driving unit is electrically connected to the power supply and the energy storage unit, an output end of the driving unit is electrically connected to the first relay, a control end of the driving unit is electrically connected to the control unit, and the detection unit is configured to detect the supply voltage of the energy storage unit input to the driving unit. In this way, the detection unit is used to detect the supply voltage of the energy storage unit input to the driving unit, so that the voltage drop on the first power supply path can be more accurately detected, and the voltage drop can be quickly responded to.

[0014] In some embodiments, the control unit is configured to control the pre-charging path to perform pre-charging protection on the main power supply path after being started, and the detection unit is electrically connected to a reset end of the control unit. In this way, the detection unit is electrically connected to the reset end of the control unit, so that the control unit can control the pre-charging path to perform pre-charging protection on the main power supply path after being reset, thereby simplifying the overall circuit structure.

[0015] In some embodiments, the pre-charging path comprises a second relay and a pre-charging resistor, the second relay and the pre-charging resistor are in series with each other, the second relay and the pre-charging resistor in series are further in parallel with the first relay, the first power supply path is electrically connected with the second relay and supplies power to the second relay under the control of the control unit, and the control unit realizes pre-charging protection by controlling the second relay to be closed when the first relay is opened. In this way, the series connection of the second relay and the pre-charging resistor simplifies the specific circuit structure of the pre-charging path, and the control unit realizes pre-charging protection by controlling the second relay to be closed when the first relay is opened, which can alleviate the load sticking caused by the excessive current of the first relay after the first relay is abnormally opened and re-closed due to the drop of the supply voltage of the first power supply path.

[0016] In some embodiments, the power management device further comprises a second power supply path electrically connected with the power supply and the control unit for supplying power to the control unit, wherein the number of adapters on the second power supply path is more than the number of adapters on the first power supply path. In this way, more adapters are arranged on the second power supply path, and the number of adapters on the first power supply path is reduced to improve the stability of the control unit and alleviate the probability of supply voltage drop due to the large number of adapters on the first power supply path.

[0017] To solve the above problems, the application provides a battery device, which comprises the power management device, a battery and a load power supply system electrically connected with the battery.

[0018] To solve the above problems, the application provides a power-using equipment, which comprises the battery device. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0020] Figure 1 is a structural schematic diagram of a vehicle according to one or more embodiments of the present application;

[0021] Figure 2 is a structural schematic diagram of a battery device according to one or more embodiments of the present application;

[0022] Figure 3 is a structural schematic diagram of a load power supply system according to one or more embodiments of the present application;

[0023] Figure 4 is a first structural schematic diagram of a power management device according to one or more embodiments of the present application;

[0024] Figure 5 is a second structural schematic diagram of a power management device according to one or more embodiments of the present application;

[0025] Figure 6 is a third structural schematic diagram of a power management device according to one or more embodiments of the present application;

[0026] Figure 7 is a structural schematic diagram of a detection unit according to one or more embodiments of the present application.

[0027] Fig. 1 is a vehicle; Fig. 2 is a battery device; Fig. 3 is a controller; Fig. 4 is a motor; Fig. 10 is a power management device; Fig. 20 is a load power supply system; Fig. 30 is a battery; Fig. 40 is a power supply; Fig. 21 is a first relay; Fig. 22 is a second relay; Fig. 23 is a pre-charge resistor; Fig. 24 is a main power supply path; Fig. 25 is a pre-charge path; Fig. 100 is a first power supply path; Fig. 110 is a driving unit; Fig. 200 is a detection unit; Fig. 210 is a comparator; Fig. 220 is a voltage follower; Fig. 230 is a flip-flop; Fig. 300 is a control unit; Fig. 310 is a timing module; Fig. 400 is an energy storage unit; Fig. 500 is a second power supply path. DETAILED DESCRIPTION

[0028] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0029] 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 the present application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0030] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0031] Reference to“an embodiment” herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase“in an embodiment” in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily all directed to the same embodiment, or to a common embodiment.

[0032] In the description of the embodiments of the present application, the term“and / or” is merely an association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character“ / ” herein generally represents an“or” relationship between the front and rear associated objects.

[0033] In the description of the embodiments of the present application, the term“a plurality of” refers to two or more (including two), and similarly, “a plurality of groups” refers to two or more groups (including two groups), and “a plurality of pieces” refers to two or more pieces (including two pieces).

[0034] In the description of the embodiments of the present application, the technical terms“center”,“longitudinal”,“transverse”,“length”,“width”,“thickness”,“upper”,“lower”,“front”,“rear”,“left”,“right”,“vertical”,“horizontal”,“top”,“bottom”,“inner”,“outer”,“clockwise”,“counterclockwise”,“axial”,“radial”,“circumferential” and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0035] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms“mounting”,“connection”,“connection”,“fixing” and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0036] Energy saving and emission reduction is the key to sustainable development, which promotes the adjustment of energy structure and the development and application of battery technology. The key to the development of battery technology lies in electrochemical energy storage technology, which has been widely used in portable electronics, electric vehicles and energy storage systems due to its high energy density, good cycle ability, high working voltage, environmental protection and low self-discharge.

[0037] The power supply system of a battery often selectively supplies power to a load by closing and opening a relay. Specifically, the relay generally includes a control circuit and a controlled circuit, the control circuit is connected to a power management device, and the controlled circuit is arranged in the power supply system. The power management device selectively supplies power to the control circuit of the relay to realize the closing and opening of the controlled circuit, thereby realizing the purpose of "small current" controlling "large current". However, during the process of the power management device supplying power to the relay, if the voltage abnormally drops, causing the relay to abnormally open and re-close, the phenomenon of load sticking caused by excessive current acting on the relay will occur.

[0038] To solve the technical problems in the related art, the present application provides a power management device for controlling a load power supply system, the load power supply system is used to supply power to a load through a relay, and the power management device can supply power to the relay. After the power supply voltage abnormally drops during the process of the power management device supplying power to the relay, causing the relay to abnormally open and re-close, the power management device can control the pre-charge circuit of the load power supply system to perform pre-charge protection on the main power supply circuit of the power management device, thereby alleviating the load sticking caused by excessive current of the relay.

[0039] Specifically, the present application provides a power consumption device, which can include but is not limited to a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric car, an electric vehicle, a ship, a spacecraft, etc. Among them, the electric toy can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric plane toys, etc. The spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc. Among them, the power consumption device can include a battery device, and the power consumption device can provide electric energy through the battery device to realize the corresponding functions.

[0040] For example, the power consumption device can include an electric vehicle, and the electric vehicle can include a battery device. Referring to Figure 1 , Figure 1 is a structural schematic diagram of a vehicle according to one or more embodiments of the present application.

[0041] The vehicle 1 can be a fuel car, a gas car, or a new energy car, and the new energy car can be a pure electric car, a hybrid car, or a range extended car, etc. The vehicle 1 is internally provided with a battery device 2, which can be arranged at the bottom, head or tail of the vehicle 1. The battery device 2 can be used for power supply of the vehicle 1, for example, the battery device 2 can be used as the power source of the vehicle 1. The vehicle 1 can also include a controller 3 and a motor 4, the controller 3 is used to control the battery device 2 to supply power to the motor 4, for example, for the working power demand of the vehicle 1 during starting, navigation and driving.

[0042] Referring to Figure 2 ,Figure 2 is a structural schematic diagram of a battery device 2 according to one or more embodiments of the present application.

[0043] The battery device 2 comprises a power management device 10, a battery 30, and a load power supply system 20 electrically connected with the battery 30.

[0044] The battery 30 can be a power battery, for example, the battery 30 can be a rechargeable battery, also known as a secondary battery 30 (Secondary Battery) or a secondary cell, a storage battery. The battery 30 can include but is not limited to nickel-hydrogen batteries and lithium-ion batteries, etc. The lithium-ion battery has the advantages of light weight, large capacity (the capacity is 1.5 times to 2 times of the same weight of nickel-hydrogen battery 30), no memory effect, etc., and has very low self-discharge rate, so even if the price is relatively high, it is still widely used. Lithium-ion batteries are currently widely used in pure electric vehicles and hybrid vehicles. The capacity of lithium-ion batteries used for such purposes is relatively low, but has a larger output, charging current, and longer service life, but the cost is higher.

[0045] The load power supply system 20 can be electrically connected with the battery 30 and the load respectively, so that the battery 30 supplies power to the load through the load power supply system 20. The power management device 10 can be used to control the load power supply system 20, for example, the power management device 10 can be electrically connected with the relay of the load power supply system 20, and can control the load power supply system 20 by supplying power to the relay.

[0046] Referring to Figure 3 , Figure 3 is a structural schematic diagram of a load power supply system 20 according to one or more embodiments of the present application.

[0047] The load power supply system 20 comprises a main power supply path 24 for supplying power to the load via a first relay 21, and a pre-charging path 25 for pre-charging protection of the main power supply path 24. The main power supply path 24 and the pre-charging path 25 are in parallel, and both are electrically connected with the load and the battery 30, so that the battery 30 can supply power to the load through the main power supply path 24 and / or the pre-charging path 25. The power supply power of the main power supply path 24 is greater than that of the pre-charging path 25. Since the load has a parasitic capacitor, if the amount of electricity in the parasitic capacitor is low, directly using the main power supply path 24 to supply power to the load will generate a larger instantaneous pulse impact surge, which will cause the first relay 21 to appear. In this case, the load can be pre-charged by the pre-charging path 25, and at this time, due to the current limiting effect of the pre-charging resistor 23 in the pre-charging path 25, the impact surge of the instantaneous pulse can be effectively reduced. When the amount of electricity in the parasitic capacitor of the load is sufficient, the load is supplied with power through the main power supply path 24 to provide power supply efficiency.

[0048] Further, when the main power supply path 24 supplies power to the load through the first relay 21, if the first relay 21 is abnormally opened for a period of time, abnormal discharge of the parasitic capacitor will occur. At this time, when the first relay 21 is closed again, the main power supply path 24 will supply power to the load through the first relay 21 again, and a large instantaneous pulse surge will also be generated, causing the first relay 21 to have a load sticking phenomenon. In order to alleviate this phenomenon, the power management device 10 can be controlled by the load power supply system 20 to pre-charge the main power supply path 24 through the pre-charge path 25 for protection.

[0049] Specifically referring to Figure 3 and Figure 4 , Figure 4 is a first structural schematic diagram of the power management device 10 according to one or more embodiments of the present application.

[0050] The power management device 10 includes a control unit 300, a first power supply path 100, and a detection unit 200. The first power supply path 100 is electrically connected to the power supply 40 and the first relay 21, and is used to supply power to the first relay 21 under the control of the control unit 300, thereby controlling the first relay 21 to be closed. The detection unit 200 is electrically connected to the control unit 300 and the first power supply path 100, and is used to detect the supply voltage on the first power supply path 100 during the power supply of the main power supply path 24. The control unit 300 is used to control the pre-charge path 25 to pre-charge the main power supply path 24 in response to the supply voltage being lower than or equal to a preset reference voltage.

[0051] The control unit 300 can be a microprogrammed control unit (MCU), or can also be a battery management system (BMS), or can also be a central control platform of the vehicle 1, etc. The relay can be an electric control device, which is a kind of electric appliance that makes the controlled quantity have a predetermined step change in the electrical output circuit when the change of the input quantity (excitation quantity) reaches the specified requirement. The relay usually has a control system (also called control loop) and a controlled system (also called controlled loop), and is usually applied to the control circuit of automation. It controls the closing and opening of the controlled loop by supplying power to the control loop. It is actually a kind of "automatic switch" that controls "large current" operation with "small current", so the relay plays the role of automatic adjustment, safety protection, and conversion of circuit in the circuit.

[0052] The power supply 40 can include, but is not limited to, a lead-acid battery, etc. The power supply 40 can provide two independent voltage outputs, one of which can supply power to the first relay 21 through the first power supply path 100, and the other of which can supply power to the control unit 300. When the power supply 40 abnormally supplies power to the first relay 21, it does not affect the power supply 40 supplying power to the control unit 300, so that after the first relay 21 is opened, the control unit 300 can control the first relay 21 to be powered through the first power supply path 100, thereby controlling the first relay 21 to be closed.

[0053] The detection unit 200 is electrically connected to the control unit 300 and the first power supply path 100, and can detect the power supply voltage on the first power supply path 100 during the power supply of the main power supply path 24 and transmit the detection result to the control unit 300. In a specific embodiment, the detection result is the power supply voltage, and the control unit 300 compares the power supply voltage with a preset reference voltage. When the power supply voltage is lower than or equal to the reference voltage, it indicates that the first power supply path 100 has a power supply abnormality (i.e., power supply voltage drop) and may have caused the first relay 21 to be abnormally opened. At this time, if the power supply of the first power supply path 100 is restored to normal, directly closing the first relay 21 will generate a large instantaneous pulse surge, causing the first relay 21 to have a load sticking phenomenon. Therefore, the control unit 300 can control the pre-charge path 25 to perform pre-charge protection on the main power supply path 24 in response to the power supply voltage being lower than or equal to the preset reference voltage. The preset reference voltage can be set according to actual conditions. In another specific embodiment, the detection result can be a trigger signal generated by the detection unit 200 in response to the power supply voltage being lower than or equal to the reference voltage. At this time, the control unit 300 only needs to respond to the trigger signal to perform the above-mentioned pre-charge protection action.

[0054] Through the above-mentioned embodiments, the control unit 300 controls the pre-charge path 25 to perform pre-charge protection on the main power supply path 24 in response to the power supply voltage being lower than or equal to the preset reference voltage, which can alleviate the load sticking phenomenon of the first relay 21 caused by the excessive current after the first relay 21 is abnormally opened and then re-closed due to the power supply voltage drop of the first power supply path 100.

[0055] In some embodiments, as Figure 3As shown, the pre-charge path 25 includes the second relay 22 and the pre-charge resistor 23, the second relay 22 and the pre-charge resistor 23 are connected in series with each other, and the series-connected second relay 22 and pre-charge resistor 23 are further connected in parallel with the first relay 21. The first power supply path 100 is electrically connected to the second relay 22 and supplies power to the second relay 22 under the control of the control unit 300. The control unit 300 realizes pre-charge protection by controlling the second relay 22 to be closed when the first relay 21 is open. The series-connected second relay 22 and pre-charge resistor 23 are connected in parallel with the first relay 21, so that the battery 30 can supply power to the load through the first relay 21 of the main power supply path 24 or through the pre-charge resistor 23 and the second relay 22 of the pre-charge path 25. By setting the resistance value of the pre-charge resistor 23 according to the actual application scenario, the instantaneous pulse surge can be effectively reduced when power is supplied through the pre-charge path 25. The first relay 21 connected by the first power supply path 100 and the second relay 22 connected by the first power supply path 100 are connected in parallel, so that the power supply 40 can independently supply power to the first relay 21 and the second relay 22. When the first relay 21 is in an open state, and the supply voltage on the first power supply path 100 detected during the power supply of the main power supply path 24 is lower than or equal to the preset reference voltage, the control unit 300 can control the second relay 22 to be closed, so that the battery 30 pre-supplies power to the load through the pre-charge resistor 23 and the second relay 22, thereby realizing pre-charge protection for the main power supply path 24. In this way, the series connection of the second relay 22 and the pre-charge resistor 23 simplifies the specific circuit structure of the pre-charge path 25, and the control unit 300 realizes pre-charge protection by controlling the second relay 22 to be closed when the first relay 21 is open, which can alleviate the load sticking caused by the excessive current of the first relay 21 after the first relay 21 is abnormally opened and re-closed due to the drop of the supply voltage of the first power supply path 100. It is worth noting that the pre-charge path 25 can also be realized by other circuits.

[0056] Further, as Figure 4As shown, the control unit 300 comprises a timing module 310 for timing the duration that the supply voltage is lower than or equal to the reference voltage, and the control unit 300 controls the pre-charge path 25 to perform pre-charge protection on the main supply path 24 in response to the duration that the supply voltage is lower than or equal to the reference voltage being greater than or equal to a preset time threshold. The preset time threshold can be set according to actual conditions. When the duration that the supply voltage is lower than or equal to the reference voltage is greater than or equal to the preset time threshold, it indicates that the duration that the supply voltage is lower than or equal to the reference voltage is relatively long, indicating that the parasitic capacitance of the load has been discharged for a long time, and directly closing the first relay 21 is more likely to produce a larger instantaneous pulse impact surge, causing the first relay 21 to exhibit a phenomenon of load sticking. When the duration that the supply voltage is lower than or equal to the reference voltage is less than the preset time threshold, it indicates that the duration that the supply voltage is lower than or equal to the reference voltage is relatively short, and the discharge amount of the parasitic capacitance of the load is small, and directly closing the first relay 21 will not produce a larger instantaneous pulse impact surge. Thus, when the duration that the supply voltage is lower than or equal to the reference voltage is greater than or equal to the preset time threshold, the control unit 300 controls the pre-charge path 25 to perform pre-charge protection on the main supply path 24, which can effectively alleviate the invalid protection of pre-charge discharge.

[0057] Further, the first supply path 100 comprises a driving unit 110, an input end of the driving unit 110 is electrically connected to the power supply 40, an output end of the driving unit 110 is electrically connected to the first relay 21, a control end of the driving unit 110 is electrically connected to the control unit 300, and the detection unit 200 is electrically connected to the input end of the driving unit 110 and is configured to detect the supply voltage of the input end of the driving unit 110. The input end of the driving unit 110 is respectively electrically connected to the detection unit 200 and the power supply 40, that is, the supply voltage of the first supply path 100 can be detected through the detection unit 200, and the control end of the driving unit 110 is electrically connected to the control unit 300, so that the control unit 300, upon receiving the supply voltage, inputs a control signal to the driving unit 110 through the control end of the driving unit 110 in response to the supply voltage being lower than or equal to the preset reference voltage, to control the pre-charge path 25 to perform pre-charge protection on the main supply path 24. Since the driving unit 110 is closer to the first relay 21 on the first supply path 100, the supply voltage of the input end of the driving unit 110 detected by the detection unit 200 can more accurately detect the voltage drop on the first supply path 100, and can respond quickly to the voltage drop.

[0058] In some embodiments, the control unit 300 is configured to control the pre-charge path 25 to pre-charge protect the main power supply path 24 after starting, and the detection unit 200 is electrically connected to the reset end of the control unit 300. The detection unit 200 is electrically connected to the reset end of the control unit 300, so that no additional interface needs to be added to the control unit 300 for electrical connection with the detection unit 200, thereby simplifying the overall structure of the control unit 300. When the supply voltage is lower than or equal to the preset reference voltage, the control unit 300 is only reset by the detection unit 200, so that the control pre-charge path 25 can pre-charge protect the main power supply path 24. Thus, through a relatively simple design, pre-charge protection during the starting process of the electrical equipment 1 can be achieved, and pre-charge protection when the supply voltage of the first power supply path 100 drops during normal operation of the electrical equipment 1 can also be achieved.

[0059] Referring to Figure 5 , Figure 5 is a second structural schematic diagram of the power management device 10 according to one or more embodiments of the present application.

[0060] The power management device 10 further includes a second power supply path 500 electrically connected to the power supply 40 and the control unit 300, for supplying power to the control unit 300, wherein the number of adapters on the second power supply path 500 is greater than the number of adapters on the first power supply path 100. The second power supply path 500 is electrically connected to the power supply 40 and the control unit 300, so that the power supply 40 can independently supply power to the first relay 21 through the first power supply path 100, and independently supply power to the control unit 300 through the second power supply path 500, so that when the power supply 40 abnormally supplies power to the first relay 21, it does not affect the power supply 40 supplying power to the control unit 300. The adapter refers to a connecting component for connecting two disconnected lines, such as a plug socket and the like. The adapter may be accidentally disconnected when subjected to vibration or impact, and power supply abnormalities may occur. Therefore, in the case where an adapter needs to be provided, the adapter is preferably arranged on the second power supply path 500 to reduce the number of adapters on the first power supply path 100, thereby improving the stability of the control unit 300. At the same time, due to the pre-charge protection mechanism described above in the case of abnormal disconnection of the first relay 21, the adverse effects caused by the large number of adapters on the first power supply path 100 can be alleviated.

[0061] Referring to Figure 6 , Figure 6 is a third structural schematic diagram of the power management device 10 according to one or more embodiments of the present application.

[0062] The power management device 10 further comprises an energy storage unit 400, which is electrically connected to the first power supply path 100. The energy storage unit 400 is configured to store the power of the power supply 40 and provide power to the first power supply path 100 when the power supply 40 fails to supply power to the first power supply path 100. The energy storage unit 400 can be a large-capacitance energy storage capacitor, which includes but is not limited to an electrolytic capacitor. The electrolytic capacitor is a type of capacitor, in which a metal foil is the positive electrode (aluminum or tantalum), an oxide film (aluminum oxide or tantalum pentoxide) that is in close contact with the positive electrode is the dielectric, and the negative electrode includes conductive material, electrolyte (which can be liquid or solid), and other materials. The energy storage unit 400 is electrically connected to the first power supply path 100, so that the power supply 40 can supply power to the energy storage unit 400 through the first power supply path 100 to store the power of the power supply 40 in the energy storage unit 400. When the power supply 40 fails to supply power to the first power supply path 100, the energy storage unit 400 can provide power to the first power supply path 100. For example, when the power supply 40 fails to supply power to the first relay 21, the energy storage unit 400 can maintain power supply to the first relay 21 through the first power supply path 100, so that the first relay 21 is delayed in being turned off by the energy storage unit 400, thereby improving reliability.

[0063] Further, the first power supply path 100 comprises a driving unit 110, an input end of the driving unit 110 is electrically connected with the power supply 40 and the energy storage unit 400, an output end of the driving unit 110 is electrically connected with the first relay 21, a control end of the driving unit 110 is electrically connected with the control unit 300, and the detection unit 200 is configured to detect a power supply voltage of the energy storage unit 400 input to the driving unit 110. The input end of the driving unit 110 is electrically connected with the power supply 40 and the energy storage unit 400, the output end of the driving unit 110 is electrically connected with the first relay 21, and the control end of the driving unit 110 is electrically connected with the control unit 300, so that the control unit 300 can selectively supply power to the first relay 21 through the power supply 40 or the energy storage unit 400 through the driving unit 110. When the power supply 40 can normally supply power to the first relay 21, the control unit 300 can supply power to the first relay 21 through the power supply 40 through the driving unit 110, when the power supply 40 cannot normally supply power to the first relay 21, and the energy storage unit 400 can supply power to the first relay 21, the control unit 300 can supply power to the first relay 21 through the energy storage unit 400 through the driving unit 110, at this time, the detection unit 200 can be configured to detect the power supply voltage of the energy storage unit 400 input to the driving unit 110, so that the control unit 300 can control the pre-charging protection of the main power supply path 24 by the pre-charging path 25 in response to the power supply voltage being lower than or equal to a preset reference voltage, thereby being able to more accurately detect the voltage drop on the first power supply path 100, and being able to quickly respond to the voltage drop.

[0064] Referring to Figure 7 , Figure 7 is a structural schematic diagram of a detection unit according to one or more embodiments of the present application.

[0065] The detection unit 200 includes a comparator 210, a first input terminal of the comparator 210 is electrically connected with the first power supply path 100 to receive the power supply voltage, a second input terminal of the comparator 210 receives a reference voltage, and an output terminal of the comparator 210 is electrically connected with the control unit 300. The comparator 210 receives the power supply voltage and the reference voltage respectively, and can be used to compare the power supply voltage and the reference voltage, and then output the comparison result to the control unit 300 through the output terminal of the comparator 210. For example, when the power supply voltage is less than or equal to the reference voltage, the comparator 210 can output a first signal to the control unit 300, and when the power supply voltage is greater than the reference voltage, the comparator 210 can output a second signal to the control unit 300. The control unit 300 can determine whether the pre-charge path 25 needs to control the pre-charge protection of the main power supply path 24 according to the received signal. In specific embodiments, the first signal can be one of a high-level signal and a low-level signal, and the second signal can be the other one of the high-level signal and the low-level signal. When the control unit 300 triggers the above-mentioned pre-charge protection mechanism in response to the first signal. In this way, the comparator 210 receives the power supply voltage and the reference voltage respectively, and generates a detection result, which not only has a simple circuit structure, but also can quickly detect the voltage drop on the first power supply path 100, and facilitate a quick response to the voltage drop.

[0066] Further, the comparator 210 outputs the first signal in response to the power supply voltage being equal to or lower than the reference voltage, the control unit 300 includes a timing module 310 for timing the duration of the first signal, and the control unit 300 controls the pre-charge protection of the main power supply path 24 by the pre-charge path 25 in response to the duration of the first signal being greater than or equal to a preset time threshold. The purpose of setting the time threshold has been described in detail above, and will not be described here again. In this way, the duration of the first signal is timed by the timing module 310, and the pre-charge protection of the main power supply path 24 by the pre-charge path 25 is controlled in combination with the first signal output by the comparator 210, which can effectively alleviate the invalid protection of pre-charge and discharge.

[0067] In some embodiments, the detection unit 200 further includes a voltage follower 220, an input terminal of the voltage follower 220 is electrically connected with an output terminal of the comparator 210, and an output terminal of the voltage follower 220 is electrically connected with the control unit 300. The voltage follower 220 is electrically connected between the output terminal of the comparator 210 and the control unit 300, and can improve the driving capability of the comparator 210 by using the impedance change of the input terminal and the output terminal of the voltage follower 220.

[0068] In some embodiments, the detection unit 200 further comprises a flip-flop 230, an input end of the flip-flop 230 being electrically connected to an output end of the comparator 210, an output end of the flip-flop 230 being electrically connected to the control unit 300, and a control end of the flip-flop 230 being used for receiving a trigger signal. The input end of the flip-flop 230 is electrically connected to the output end of the comparator 210, the output end of the flip-flop 230 is electrically connected to the control unit 300, and the control end of the flip-flop 230 is used for receiving a trigger signal, so that the trigger signal of the flip-flop 230 can be used to control the control timing of the output result of the comparator 210 to the control unit 300, thereby improving the reliability and anti-interference capability. For example, the trigger signal can be generated according to the specific working condition of the electrical equipment, or the trigger signal can be realized according to the actual on-off state of the first relay 21. It should be noted that in Figure 6 the detection unit 200 is shown to simultaneously comprise the voltage follower 220 and the flip-flop 230, but in actual application, selection can be made according to specific conditions.

[0069] It should be noted that in Figure 6 the detection unit 200 is shown to simultaneously comprise the voltage follower 220 and the flip-flop 230, and an output end of the flip-flop 230 is electrically connected to an input end of the voltage follower 220, i.e., the output end of the flip-flop 230 is electrically connected to the control unit 300 through the voltage follower 220. However, in actual application, selection can be made according to specific conditions, for example, when only the flip-flop 230 is needed to be used, the output end of the flip-flop 230 can be directly electrically connected to the control unit 300.

[0070] In summary, the control unit 300 controls the pre-charging path 25 to perform pre-charging protection on the main power supply path 24 in response to the power supply voltage being lower than or equal to the preset reference voltage, so that the load sticking caused by the first relay 21 due to the excessively large current after the first relay 21 is abnormally opened and then re-closed due to the power supply voltage drop of the first power supply path 100 can be alleviated.

[0071] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: the technical solutions recorded in the foregoing embodiments can still be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the description of the present application. In particular, the technical features mentioned in each embodiment can be combined in any way as long as there is no structural conflict. The present 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 power management device, characterized by, A power management device for controlling a load power supply system, the load power supply system comprising a main power supply path for supplying power to a load via a first relay and a pre-charge path for pre-charge protection of the main power supply path, the power management device comprising: a control unit; a first power supply path electrically connecting a power supply and the first relay and configured to supply power to the first relay under the control of the control unit to thereby control the first relay to be closed; a detection unit electrically connecting the control unit and the first power supply path and configured to detect a supply voltage on the first power supply path during power supply of the main power supply path; the control unit being configured to control the pre-charge path to perform pre-charge protection of the main power supply path in response to the supply voltage being lower than or equal to a preset reference voltage.

2. The power management device of claim 1, wherein, the control unit comprising a timing module configured to time a duration for which the supply voltage is lower than or equal to the reference voltage, the control unit being configured to control the pre-charge path to perform pre-charge protection of the main power supply path in response to the duration for which the supply voltage is lower than or equal to the reference voltage being greater than or equal to a preset time threshold.

3. The power management device of claim 1, wherein, the first power supply path comprising a drive unit having an input electrically connected to the power supply, an output electrically connected to the first relay, and a control terminal electrically connected to the control unit, the detection unit being electrically connected to the input of the drive unit and configured to detect the supply voltage at the input of the drive unit.

4. The power management apparatus according to any one of claims 1 to 3, characterized by the detection unit comprising a comparator having a first input electrically connected to the first power supply path to receive the supply voltage, a second input to receive the reference voltage, and an output electrically connected to the control unit.

5. The power management device of claim 4, wherein, the comparator being configured to output a first signal in response to the supply voltage being equal to or lower than the reference voltage, the control unit comprising a timing module configured to time a duration for which the first signal is output, the control unit being configured to control the pre-charge path to perform pre-charge protection of the main power supply path in response to the duration for which the first signal is output being greater than or equal to a preset time threshold.

6. The power management device of claim 4, wherein, the detection unit further comprising a voltage follower having an input electrically connected to the output of the comparator and an output electrically connected to the control unit.

7. The power management device of claim 4, wherein, the detection unit further comprising a flip-flop having an input electrically connected to the output of the comparator, an output electrically connected to the control unit, and a control terminal configured to receive a trigger signal.

8. The power management device of claim 1, wherein, the power management device further comprising an energy storage unit electrically connected to the first power supply path, the energy storage unit being configured to store electrical energy from the power supply and to supply electrical energy to the first power supply path in the event of a power supply abnormality of the power supply to the first power supply path.

9. The power management device of claim 8, wherein, The first power supply path comprises a driving unit, an input end of the driving unit being electrically connected with the power supply and the energy storage unit, an output end of the driving unit being electrically connected with the first relay, a control end of the driving unit being electrically connected with the control unit, and the detection unit being used for detecting the power voltage inputted from the energy storage unit to the driving unit.

10. The power management device of claim 1, wherein, The control unit is arranged to control the pre-charging path to perform pre-charging protection on the main power supply path after being started, and the detection unit is electrically connected with a reset end of the control unit.

11. The power management device of claim 1, wherein, The pre-charging path comprises a second relay and a pre-charging resistor, the second relay and the pre-charging resistor are connected with each other in series, the series-connected second relay and pre-charging resistor are further connected with the first relay in parallel, the first power supply path is electrically connected with the second relay, and the control unit is used for supplying power to the second relay, and the pre-charging protection is realized by controlling the second relay to be closed when the first relay is opened.

12. The power management device of claim 1, wherein, The power management device further comprises a second power supply path, the second power supply path is electrically connected with the power supply and the control unit, and is used for supplying power to the control unit, wherein the number of switches on the second power supply path is more than the number of switches on the first power supply path.

13. A battery device characterized by comprising: The battery device comprises the power management device, the battery and the load power supply system electrically connected with the battery according to any one of claims 1-12.

14. An electrical device, characterized by The power utilization equipment comprises the battery device according to claim 13. The power utilization equipment comprises the battery device according to claim 13.

Images