Battery-powered protection device and battery-powered system

Abstract

The application discloses a battery-powered protection device and a battery-powered system. The battery-powered protection device is used for controlling a power supply circuit for supplying power to a battery management system (BMS) and a battery, and comprises: an acquisition unit, which is used for acquiring at least one of a power supply voltage of the power supply circuit and a power supply current of the power supply circuit; a driving control unit, which is connected to the acquisition unit and is used for generating a driving signal based on the at least one of the power supply voltage and the power supply current; and an execution unit, which is connected to the driving control unit in series with the power supply circuit and is used for controlling, under the driving of the driving control unit, a power supply state of the power supply circuit to the BMS and the battery. Thus, when the power supply voltage and / or the power supply current is abnormal, the power supply of the power supply circuit to the BMS and the battery can be disconnected, and the safety protection of the BMS and the battery in the charging and discharging process can be realized, the reliability is high, and the battery failure caused by the BMS failure can be effectively avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of battery control, in particular to a battery power supply protection device and a battery power supply system. BACKGROUND

[0002] In the related art, the battery is often protected from charging and discharging based on a battery management system (BMS). For example, by collecting and calculating parameters such as voltage, current, temperature, and SOC (state of charge), the charging and discharging process of the battery is controlled to protect the battery. If the BMS internal power device is damaged due to external abnormally high voltage, the BMS will fail, which will also cause the battery to fail.

[0003] In the related art, considering that the BMS cannot withstand high voltage during operation, an isolated power supply circuit is often used to supply power to the BMS and the battery. However, the isolated power supply circuit needs to use a transformer, which is difficult to apply in space-limited scenarios. In addition, the magnetic core of the transformer may be saturated, or high voltage may be coupled to the back end after the insulation withstand voltage fails, thereby causing the BMS and the battery to fail. SUMMARY

[0004] Therefore, the embodiments of the present application provide a battery power supply protection device and a battery power supply system, which are designed to effectively protect the BMS and the battery.

[0005] The technical solutions of the embodiments of the present application are as follows:

[0006] The embodiments of the present application provide a battery power supply protection device for controlling a power supply circuit that supplies power to a battery management system (BMS) and a battery. The battery power supply protection device comprises:

[0007] An acquisition unit is configured to acquire at least one of a power supply voltage of the power supply circuit and a power supply current of the power supply circuit.

[0008] A drive control unit is connected to the acquisition unit and is configured to generate a drive signal based on at least one of the power supply voltage and the power supply current.

[0009] An execution unit is connected to the drive control unit and is configured to control the power supply state of the power supply circuit to the BMS and the battery under the drive of the drive control unit.

[0010] In some embodiments, the execution unit comprises at least one of the following:

[0011] A first execution unit is connected to the drive control unit and is located on a positive power supply branch of the power supply circuit.

[0012] The second execution unit is connected to the drive control unit and is located on a negative power supply branch of the power supply circuit.

[0013] In some embodiments, the drive control unit comprises:

[0014] The controller is connected to the acquisition unit and is configured to acquire at least one of the power supply voltage and the power supply current, and generate a control instruction based on a preset threshold value;

[0015] The drive circuit is connected to the controller and is configured to output a drive signal based on the control instruction.

[0016] In some embodiments, the drive control unit further comprises:

[0017] The voltage conversion circuit is connected to the power supply circuit and is configured to convert the power supply voltage of the power supply circuit into a target voltage for supplying the controller and the drive circuit.

[0018] In some embodiments, the execution unit comprises a first execution unit and a second execution unit, and the drive circuit is a half-bridge driver having a first drive terminal connected to the first execution unit and a second drive terminal connected to the second execution unit.

[0019] In some embodiments, if the controller determines that at least one of the following conditions is met: the power supply voltage is greater than or equal to a preset voltage threshold value, and the power supply current is greater than or equal to a first preset current threshold value, a first control instruction indicating to disconnect at least one of the first execution unit and the second execution unit is generated; accordingly, the drive circuit controls at least one of the first execution unit and the second execution unit to be disconnected based on the first control instruction.

[0020] In some embodiments, the acquisition unit comprises: a first acquisition circuit configured to acquire the power supply voltage of the power supply circuit; and an output terminal of the first acquisition circuit connected to the drive control unit.

[0021] In some embodiments, the acquisition unit comprises: a second acquisition circuit configured to acquire the power supply current of the power supply circuit; and an output terminal of the second acquisition circuit connected to the drive control unit.

[0022] In some embodiments, the second acquisition circuit comprises:

[0023] The current acquisition resistor is connected in series to the power supply circuit and is configured to acquire the power supply current.

[0024] The voltage bias branch is configured to output a bias voltage.

[0025] The operational amplifier has a first input terminal connected to the current acquisition resistor, a second input terminal connected to the voltage bias branch, and an output terminal connected to the drive control unit, so as to transmit a signal representing the power supply current to the drive control unit.

[0026] The application further provides a battery power supply system, comprising the power supply circuit and the battery power supply protection device.

[0027] In some embodiments, the power supply circuit is a non-isolated power supply circuit.

[0028] The application provides the technical scheme, because the acquisition unit can acquire at least one of the power supply voltage and the power supply current of the power supply circuit, the driving control unit is connected with the acquisition unit, can generate the driving signal based on at least one of the power supply voltage and the power supply current, and the execution unit can control the power supply state of the power supply circuit to the BMS and the battery under the driving of the driving control unit, so that the power supply circuit can be disconnected to the BMS and the battery when the power supply voltage and / or the power supply current are abnormal, and the safety protection of the BMS and the battery in the charging and discharging process can be realized, the reliability is high, and the battery failure caused by the BMS failure can be effectively avoided. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of the battery power supply protection device of the application;

[0030] Figure 2 It is a structural schematic diagram of the acquisition unit and the driving control unit in the application;

[0031] Figure 3 It is a structural schematic diagram of the battery power supply system of the application embodiment one;

[0032] Figure 4 It is a structural schematic diagram of the battery power supply system of the application embodiment two;

[0033] Figure 5 It is a structural schematic diagram of the battery power supply system of the application embodiment three;

[0034] Figure 6 It is a structural schematic diagram of the battery power supply system of the application embodiment four;

[0035] Figure 7 It is a structural schematic diagram of the battery power supply system of the application embodiment five.

[0036] BRIEF DESCRIPTION OF DRAWINGS

[0037] 101, rectifier unit;

[0038] 102, power supply conversion unit; 201, acquisition unit; 2011, first acquisition circuit; 2012, second acquisition circuit;

[0039] 202, driving control unit; 2021, controller; 2022, driving circuit; 2023, voltage conversion circuit;

[0040] 203、execution unit; 2031, first execution unit; 2032, second execution unit;

[0041] 3、BMS and battery. DETAILED DESCRIPTION

[0042] The application will be described in further detail below with reference to the drawings and embodiments.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application.

[0044] In the description of the present application, the terms "first", "second", and the like are merely used to distinguish similar objects, and do not represent a specific order or sequence of the objects. It is understood that the terms "first", "second", and the like can be interchangeable under certain circumstances, and the specific order or sequence of the embodiments of the present application described herein can be implemented in other sequences other than those illustrated or described herein. Unless otherwise specified, the meaning of "a plurality" is at least two.

[0045] In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are merely for the convenience of describing 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 present application.

[0046] In the description of the present application, it is to be understood that unless otherwise specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; 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 communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0047] In the related art, the BMS is often used to protect the battery from overcharging and discharging. If there is an abnormal phenomenon such as overvoltage impact in the power supply circuit supplying power to the BMS and the battery, the internal power device of the BMS may be damaged, and the BMS may be disabled or even the battery may be disabled.

[0048] Based on this, in various embodiments of the present application, the power supply circuit for supplying power to the BMS and the battery is monitored for abnormalities, and the power supply state of the power supply circuit to the BMS and the battery is controlled, thereby realizing safety protection of the BMS and the battery during charging and discharging.

[0049] As shown in Figure 1 , in an example embodiment of the present application, the power supply circuit can convert alternating current input from the mains into direct current to supply power to the BMS and the battery 3, and the power supply circuit includes a rectifier unit 101 and a power supply conversion unit 102, wherein the rectifier unit 101 is used to convert alternating current input from L (live wire) and N (neutral wire) into first direct current, and the power supply conversion unit 102 can be a buck circuit, which is used to convert the first direct current into suitable second direct current to supply power to the BMS and the battery 3.

[0050] The present application provides a battery power supply protection device for controlling the power supply circuit for supplying power to the BMS and the battery 3, as shown in Figure 1 , the battery power supply protection device includes a collection unit 201, a drive control unit 202 and an execution unit 203; wherein the collection unit 201 is used to collect at least one of the power supply voltage and the power supply current of the power supply circuit; the drive control unit 202 is connected to the collection unit 201, and is used to generate a drive signal based on at least one of the power supply voltage and the power supply current; the execution unit 203 is connected in series to the power supply circuit and is connected to the drive control unit 202, and is used to control the power supply state of the power supply circuit to the BMS and the battery 3 under the drive of the drive control unit 202.

[0051] Since the collection unit 201 can collect at least one of the power supply voltage and the power supply current of the power supply circuit, the drive control unit 202 is connected to the collection unit 201 and can generate a drive signal based on at least one of the power supply voltage and the power supply current, and the execution unit 203 can control the power supply state of the power supply circuit to the BMS and the battery 3 under the drive of the drive control unit 202, so that the power supply of the power supply circuit to the BMS and the battery 3 can be disconnected when the power supply voltage and / or the power supply current is abnormal, thereby realizing safety protection of the BMS and the battery during charging and discharging, and having high reliability and can effectively avoid battery failure caused by BMS failure.

[0052] It can be understood that the execution unit 203 can include, as Figure 1At least one of the first execution unit 2031 and the second execution unit 2032 is shown, wherein the first execution unit 2031 is connected to the driving control unit 202 and located on the positive power supply branch of the power supply circuit, and the second execution unit 2032 is connected to the driving control unit 202 and located on the negative power supply branch of the power supply circuit. In this way, as long as the driving control unit 202 controls at least one of the first execution unit 2031 and the second execution unit 2032 to be disconnected, the power supply circuit can be disconnected to supply power to the BMS and the battery 3.

[0053] Here, the first execution unit 2031 or the second execution unit 2032 can be a switch tube such as a MOS tube (metal-oxide semiconductor field effect transistor) or an IGBT tube (insulated gate bipolar transistor), which is convenient for driving control by the driving control unit 202.

[0054] In some embodiments, as shown, Figure 2 The driving control unit 202 includes a controller 2021 and a driving circuit 2022, wherein the controller 2021 is connected to the acquisition unit 201 to obtain at least one of the power supply voltage and the power supply current, and generate a control instruction based on a preset threshold value; the driving circuit 2022 is connected to the controller 2021 to output a driving signal based on the control instruction to drive the first execution unit 2031 and / or the second execution unit 2032 to act.

[0055] In some embodiments, the driving control unit further includes a voltage conversion circuit 2023 connected to the power supply circuit to convert the power supply voltage of the power supply circuit into a target voltage for supplying power to the controller 2021 and the driving circuit 2022. In this way, the power supply of the power supply circuit can be used to supply power to the controller 2021 and the driving circuit 2022.

[0056] In some embodiments, the first execution unit 2031 can be arranged on the positive power supply branch of the power supply circuit, and the second execution unit 2032 can be arranged on the negative power supply branch of the power supply circuit. In this way, even if any one of the first execution unit 2031 and the second execution unit 2032 fails, the other one can still be driven by the driving control unit 202 to protect the BMS and the battery 3. Here, the driving circuit 2022 can be a half-bridge driver having a first driving terminal connected to the first execution unit 2031 and a second driving terminal connected to the second execution unit 2032. The half-bridge driver can be an optical coupling gate driver structure, i.e., two optical couplers and two gate drivers are used to realize isolation between the first driving terminal and the second driving terminal, or a pulse transformer gate driver structure or a digital isolator gate driver structure, which is not limited in the present application.

[0057] In some embodiments, as shown,Figure 2 As shown, the acquisition unit 201 comprises a first acquisition circuit 2011 for acquiring the supply voltage of the power supply circuit; and an output terminal of the first acquisition circuit 2011 is connected to the driving control unit 202. In this way, the driving control unit 202 can acquire the supply voltage of the power supply circuit on line, so as to determine whether the power supply circuit is abnormal based on the acquired supply voltage on line. Here, the first acquisition circuit 2011 can adopt a structure of a voltage dividing resistor, so as to output a signal representing the voltage between the positive supply branch and the negative supply branch of the power supply circuit.

[0058] In some embodiments, as shown in FIG. 2, the acquisition unit 201 comprises a second acquisition circuit 2012 for acquiring the supply current of the power supply circuit; and an output terminal of the second acquisition circuit 2012 is connected to the driving control unit 202. In this way, the driving control unit 202 can acquire the supply current of the power supply circuit on line, so as to determine whether the power supply circuit is abnormal based on the acquired supply current on line. Figure 2

[0059] In some embodiments, the second acquisition circuit 2012 comprises a current acquisition resistor, a voltage bias branch and an operational amplifier, wherein the current acquisition resistor is connected in series to the power supply circuit, for acquiring the supply current; the voltage bias branch is for outputting a bias voltage; and a first input terminal of the operational amplifier is connected to the current acquisition resistor, a second input terminal of the operational amplifier is connected to the voltage bias branch, and an output terminal of the operational amplifier is connected to the driving control unit 202, so as to transmit a signal representing the supply current to the driving control unit 202. It can be understood that the second acquisition circuit 2012 can also be a Hall sensing element for acquiring the current.

[0060] In some embodiments, the aforementioned controller 2021 can be implemented by an Application Specific Integrated Circuit (ASIC), a DSP, a Programmable Logic Device (PLD), a Complex Programmable Logic Device (CPLD), an FPGA, a general-purpose processor, a Micro Controller Unit (MCU), a Microprocessor, or other electronic elements.

[0061] ​In some embodiments, if the controller 2021 determines that at least one of the following conditions is met: the supply voltage is greater than or equal to a preset voltage threshold, and the supply current is greater than or equal to a first preset current threshold, a first control instruction is generated to indicate that at least one of the first execution unit 2031 and the second execution unit 2032 is disconnected; accordingly, the driving circuit 2022 controls at least one of the first execution unit 2031 and the second execution unit 2032 to be disconnected based on the first control instruction.

[0062] Here, the preset voltage threshold is a basis for determining whether the supply circuit is subjected to an overvoltage impact, which can be reasonably determined according to experiments. If the controller 2021 determines that the supply voltage is greater than or equal to the preset voltage threshold based on the signal output by the first acquisition circuit 2011, it is determined that the supply circuit is abnormal, and the supply circuit is controlled to be disconnected from the BMS and the battery 3, for example, the driving circuit 2022 is instructed to disconnect the first execution unit 2031 and / or the second execution unit 2032.

[0063] Here, the first preset current threshold is a basis for determining whether the supply circuit is subjected to current overcurrent during the charging and discharging process, which can be reasonably determined according to experiments. If the controller 2021 determines that the supply current is greater than or equal to the first preset current threshold based on the signal output by the second acquisition circuit 2012, it is determined that there is an abnormality of current overcurrent, and the supply circuit is controlled to be disconnected from the BMS and the battery 3, for example, the driving circuit 2022 is instructed to disconnect the first execution unit 2031 and / or the second execution unit 2032.

[0064] The embodiments of the present application also provide a battery supply system, which comprises a supply circuit for supplying power to a BMS and a battery 3 and the battery supply protection device of the embodiments of the present application.

[0065] In some embodiments, the supply circuit is a non-isolated power supply circuit, which is beneficial to reduce the space occupied by the circuit. As shown in Figure 1 The supply circuit comprises a rectifier unit 101 and a power supply conversion unit 102, wherein the rectifier unit 101 is used to convert alternating current input by L (live wire) and N (neutral wire) into first direct current, and the power supply conversion unit 102 can be a buck circuit, which is used to convert the first direct current into appropriate second direct current to supply power to the BMS and the battery 3.

[0066] In the embodiment of the present application, since the acquisition unit 201 can acquire at least one of the supply voltage and the supply current of the power supply circuit, the driving control unit 202 is connected to the acquisition unit 201, can generate a driving signal based on at least one of the supply voltage and the supply current, and the execution unit 203 can control the power supply state of the power supply circuit to the BMS and the battery 3 under the driving of the driving control unit 202, so that the power supply of the power supply circuit to the BMS and the battery 3 can be disconnected when the supply voltage and / or the supply current is abnormal, thereby realizing the safety protection of the BMS and the battery 3 in the charging and discharging process, having high reliability, and effectively avoiding the battery failure caused by the failure of the BMS.

[0067] The present application will be further described in detail below in combination with application examples.

[0068] Application Example One

[0069] As shown in Figure 3 , in the present application, the commercial power is rectified by the rectification unit 101, filtered by the inductor L0 and the capacitor C0, and then supplied to the BMS and the battery 3 after being stepped down and converted by the power conversion unit 102. Among them, one end of the inductor L0 is connected to the positive terminal of the rectification unit 101, and the capacitor C0 is located at the other end of the inductor L0 and connected to the negative terminal of the rectification unit 101. The power conversion unit 102 includes a switching tube Q1, a filter circuit composed of an inductor L1 and a capacitor C1, and a freewheeling diode D1. By controlling the conduction and cutoff of the switching tube Q1, the direct current voltage is converted into a pulse voltage, and then the pulse voltage is filtered by the filter circuit composed of the inductor L1 and the capacitor C1 to convert into a direct current voltage output, and connected to the BMS and the battery 3 through the positive terminal V+ and the negative terminal V-.

[0070] As shown in Figure 3 , the voltage conversion circuit 2023 is connected to both ends of the capacitor C0, for stepping down and converting the voltage at both ends of the capacitor C0 to supply power to the controller 2021 and the driving circuit 2022. The first acquisition circuit 2011 includes a resistor R6 and a resistor R7 connected to both ends of the capacitor C0, wherein the connection of the resistor R6 and the resistor R7 is electrically connected to the controller 2021, so that the controller 2021 can acquire the voltage at the sampling point PO1', and determine whether the power supply circuit is abnormal based on the voltage at PO1'.

[0071] In this application embodiment, a second execution unit 2032 is provided on the negative terminal V- side (i.e., the negative power supply branch). The second execution unit 2032 includes a switch Q2, a resistor R4, and a resistor R5. Exemplarily, the output terminal of the drive circuit 2022 is connected to the negative power supply branch of the power supply circuit via resistors R5 and R4 in sequence. The collector and emitter of the switch Q2 are connected to this negative power supply branch, and its base is connected between resistors R5 and R4. It is used to turn on or off under the drive signal output by the drive circuit 2022, thereby realizing the switching between the power supply circuit and the BMS and battery 3. Here, the switch Q2 can be an NPN type MOSFET or an NPN type IGBT.

[0072] After the power supply circuit is powered on, the controller 2021 determines that the power supply voltage is overvoltage based on the voltage at the sampling point PO1', and then outputs the pulse width modulation signal PWM1 to the drive circuit 2022, so that the drive circuit 2022 outputs the pulse width modulation signal PWM1' used to turn off the switching transistor Q2.

[0073] Application Example 2

[0074] like Figure 4 As shown, this application example is in Figure 3 Based on the application embodiment shown, the first acquisition circuit 2011 is replaced with the second acquisition circuit 2012. That is, the controller 2021 determines whether the power supply circuit is abnormal based on the signal acquired by the second acquisition circuit 2012, so as to protect the BMS and battery 3 in time when there is an abnormality.

[0075] like Figure 4 As shown, the second acquisition circuit 2012 includes: a current acquisition resistor Rs, a voltage bias branch, and an operational amplifier IC1. The voltage bias branch includes: a power supply VCC, resistors R10 and R11. The power supply VCC is connected to the negative power supply branch via resistors R10 and R11. The connection between resistors R10 and R11 is electrically connected to the non-inverting input terminal of the operational amplifier IC1. The current acquisition resistor Rs is connected to the negative power supply branch and is used to acquire the current flowing through the negative power supply branch. The terminal of the current acquisition resistor Rs furthest from GND (ground) is connected to the inverting input terminal of the operational amplifier IC1 via resistor R12. The output terminal of the operational amplifier IC1 is connected to the controller 2021. Optionally, a negative feedback resistor Rf is also connected in series between the output terminal and the inverting input terminal of the operational amplifier IC1. It is understandable that the operational amplifier IC1 can convert the voltage value input to the inverting input terminal, which is proportional to the supply current, and output it to the controller 2021. That is, the controller 2021 can determine whether there is an abnormal current in the power supply circuit based on the output signal at the sampling point PO1'.

[0076] Here, after the power supply circuit is powered on, the controller 2021 determines that the power supply current is overcurrent based on the output signal at the sampling point PO2', and then outputs the pulse width modulation signal PWM2 to the drive circuit 2022, so that the drive circuit 2022 outputs the pulse width modulation signal PWM2' used to turn off the switching transistor Q2.

[0077] Application Example 3

[0078] like Figure 5 As shown, this application example is in Figure 3 Based on the application embodiment shown, the second execution unit 2032 is replaced with the first execution unit 2031 located on the positive terminal V+ side (i.e., the positive power supply branch).

[0079] like Figure 5 As shown, the first execution unit 2031 includes a switching transistor Q3, resistors R8 and R9, and a capacitor C2. Exemplarily, the output of the drive circuit 2022 is connected sequentially to the positive power supply branch of the power supply circuit (e.g., connected to the connection point of inductor L1 and capacitor C1) via resistors R9 and R8. The collector and emitter of the switching transistor Q3 are connected to this positive power supply branch, and its base is connected between resistors R9 and R8. A storage capacitor C2 is also provided across resistor R8. Thus, the switching transistor Q3 can be turned on or off under the drive signal output by the drive circuit 2022, thereby switching the power supply circuit on or off with the BMS and battery 3. Here, the switching transistor Q3 can be an NPN MOSFET or an NPN IGBT.

[0080] Application Example 4

[0081] like Figure 6 As shown, this application example is in Figure 4 Based on the application embodiment shown, the second execution unit 2032 is replaced by the first execution unit 2031 located on the positive terminal V+ side (i.e., the positive power supply branch). For details, please refer to the relevant descriptions of the aforementioned application embodiment one, application embodiment two, and application embodiment three, which will not be repeated here.

[0082] Application Example 5

[0083] like Figure 7 As shown, this application example is in Figure 3 Based on the application embodiment shown, a second acquisition circuit 2012 for power supply current detection is added, and a first execution unit 2031 is added, which is located on the positive terminal V+ side (i.e., the positive power supply branch). Here, the second acquisition circuit 2012 can be referred to the relevant description of the aforementioned application embodiment two, and the first execution unit 2031 can be referred to the relevant description of the aforementioned application embodiment three, and will not be repeated here.

[0084] It can be understood that the controller 2021 is connected with the first acquisition circuit 2011 and the second acquisition circuit 2012, so that the controller can control the power supply circuit based on the power supply voltage and the power supply current, so that when any one of the power supply voltage and the power supply current is abnormal, the power supply can be reliably disconnected, thereby realizing double protection of the BMS and the battery 3.

[0085] Here, the controller 2021 can output PWM1 to the driving circuit 2022, so that the driving circuit 2022 outputs PWM1' to the first execution unit 2031; the controller can output PWM2 to the driving circuit 2022, so that the driving circuit 2022 outputs PWM2' to the second execution unit 2032. Wherein, the driving circuit 2022 adopts a half-bridge driver, the first driving terminal of the half-bridge driver outputs PWM1' to the first execution unit 2031, and the second driving terminal outputs PWM2' to the second execution unit 2032. It can be understood that if the power supply circuit is working normally, PWM1' makes the first execution unit 2031 conduct, and PWM2' makes the second execution unit 2032 conduct, if the power supply circuit has abnormal power supply voltage and / or power supply current, the controller 2021 can instruct the half-bridge driver to disconnect the first execution unit 2031 and / or the second execution unit 2032. Preferably, the half-bridge driver can be controlled to disconnect the first execution unit 2031 and the second execution unit 2032 at the same time when the abnormality occurs, thereby improving the reliability of protection.

[0086] In an application example, the protection control process of the battery power supply system is as follows:

[0087] The battery power supply system is powered on to charge the BMS and the battery 3. The controller 2021 judges whether there is a voltage overrun and / or a current overrun, for example, the controller 2021 can perform voltage detection of the power supply circuit based on the signal collected by the first acquisition circuit 2011, and the controller 2021 can perform current detection of the power supply circuit based on the signal collected by the first acquisition circuit 2011. If the controller 2021 determines that at least one of the current and the voltage of the power supply circuit reaches or exceeds the threshold value, the controller 2021 controls the switch tube Q2 and the switch tube Q3 to be disconnected, so that the V+ and the V- of the power supply circuit are disconnected, thereby realizing protection of the BMS and the battery 3. If the controller 2021 determines that the current and the voltage of the power supply circuit are normal, the controller 2021 controls the power supply circuit to operate normally, that is, the switch tube Q2 and the switch tube Q3 remain conductive.

[0088] In this way, when the power supply voltage and / or the power supply current is abnormal, the power supply circuit can be disconnected to supply power to the BMS and the battery 3, thereby realizing safety protection of the BMS and the battery 3 during charging and discharging, and the reliability is high, which can effectively avoid battery failure caused by BMS failure.

[0089] It should be noted that "first", "second", etc. are used to distinguish similar objects, and do not necessarily have to describe a specific order or sequence.

[0090] In addition, the technical solutions described in the embodiments of the present application can be combined arbitrarily without conflict.

[0091] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A battery powered protection device, characterized in that, The application relates to a battery power supply protection device for controlling a power supply circuit for supplying power to a battery management system (BMS) and a battery, wherein the power supply circuit is a non-isolated power supply circuit. The battery power supply protection device comprises: a collection unit configured to collect at least one of a power supply voltage of the power supply circuit and a power supply current of the power supply circuit; a drive control unit connected to the collection unit and configured to generate a drive signal based on the at least one of the power supply voltage and the power supply current; an execution unit connected to the drive control unit and configured to control a power supply state of the power supply circuit to the BMS and the battery under the drive of the drive control unit; wherein the execution unit comprises: a first execution unit connected to the drive control unit and located on a positive power supply branch of the power supply circuit; a second execution unit connected to the drive control unit and located on a negative power supply branch of the power supply circuit; the drive control unit comprises: a controller connected to the collection unit and configured to acquire the at least one of the power supply voltage and the power supply current, and generate a control instruction based on a preset threshold value; a drive circuit connected to the controller and configured to output the drive signal based on the control instruction; a voltage conversion circuit connected to the power supply circuit and configured to convert the power supply voltage of the power supply circuit into a target voltage for supplying power to the controller and the drive circuit; 2. The battery powered protection device of claim 1, wherein, if the controller determines that at least one of the power supply voltage is greater than or equal to a preset voltage threshold value and the power supply current is greater than or equal to a first preset current threshold value, a first control instruction indicating that the first execution unit and the second execution unit are disconnected is generated; accordingly, the drive circuit controls the first execution unit and the second execution unit to be disconnected based on the first control instruction.

3. The battery powered protection device of claim 1, wherein, The drive circuit is a half-bridge driver having a first drive terminal connected to the first execution unit and a second drive terminal connected to the second execution unit.

4. The battery powered protection device of claim 1, wherein, The collection unit comprises a first collection circuit configured to collect the power supply voltage of the power supply circuit, and an output end of the first collection circuit is connected to the drive control unit.

5. The battery powered protection device of claim 4, wherein, The collection unit comprises a second collection circuit configured to collect the power supply current of the power supply circuit, and an output end of the second collection circuit is connected to the drive control unit. The second collection circuit comprises: a current collection resistor connected to the power supply circuit and configured to collect the power supply current; a voltage bias branch configured to output a bias voltage; 6. A battery powered system, characterized by an operational amplifier having a first input end connected to the current collection resistor, a second input end connected to the voltage bias branch, and an output end connected to the drive control unit, so as to transmit a signal representing the power supply current to the drive control unit. The application further relates to a battery power supply protection device for supplying power to a BMS and a battery, and the battery power supply protection device comprises the power supply circuit and any one of the battery power supply protection devices according to claims 1 to 5. The power supply circuit is a non-isolated power supply circuit.

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