BMS activation circuit and energy storage device

Abstract

The present application relates to a BMS activation circuit and energy storage device, and the BMS activation circuit includes: a rectifier circuit, a protection circuit and an activation circuit. Among them, the input end of the rectifier circuit is connected to an AC power supply; the input end of the activation circuit is connected to an activation voltage source, and the output end of the activation circuit is connected to the BMS, and the voltage output by the activation voltage source is used to activate the BMS; the protection circuit is connected to the output end of the rectifier circuit and the activation circuit respectively, and is used to control the activation voltage path between the input end and the output end of the activation circuit to be turned on when the voltage output by the rectifier circuit is within the target voltage range, and is used to control the activation voltage path to be turned off when the voltage output by the rectifier circuit is outside the target voltage range. The BMS activation method provided in the embodiment of the present application can be more flexible and convenient.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to a BMS activation circuit and an energy storage device. Background Art

[0002] With the development of battery technology and power electronics technology, energy storage devices (or energy storage products) are favored by more and more users, and more functional requirements are also put forward for energy storage devices, such as alternating current (AC) charging and photovoltaic (PV) charging. Among them, for AC charging function, AC alternating current activation charging is a major advantage of energy storage devices.

[0003] In the related art, when the presence of AC power is detected, the battery management system (BMS) in the energy storage device can be activated by pressing a button, so that the BMS controls the battery in the energy storage device to charge. However, the BMS activation method in the related art is relatively complicated. Summary of the invention

[0004] Based on this, it is necessary to provide a BMS activation circuit and energy storage device that can realize a flexible and convenient BMS activation method.

[0005] In a first aspect, an embodiment of the present application provides a BMS activation circuit, the BMS activation circuit comprising: a rectifier circuit, a protection circuit, and an activation circuit;

[0006] Wherein, the input end of the rectifier circuit is connected to an AC power source;

[0007] The input end of the activation circuit is connected to the activation voltage source, the output end of the activation circuit is connected to the BMS, and the voltage output by the activation voltage source is used to activate the BMS;

[0008] A protection circuit, the protection circuit is connected to the output end of the rectifier circuit and the activation circuit respectively, and is used to control the activation voltage path between the input end and the output end of the activation circuit to be turned on when the voltage output by the rectifier circuit is within the target voltage range, and is used to control the activation voltage path to be turned off when the voltage output by the rectifier circuit is outside the target voltage range.

[0009] In some embodiments, an activation switch is provided on the activation voltage path; the protection circuit includes an undervoltage protection circuit and an overvoltage protection circuit;

[0010] an undervoltage protection circuit, connected to the output end of the rectifier circuit and the activation switch respectively, and configured to output a driving voltage when the voltage output by the rectifier circuit is greater than or equal to the first voltage threshold, wherein the driving voltage is used to drive the activation switch to conduct;

[0011] The overvoltage protection circuit is connected to the output end of the rectifier circuit. The overvoltage protection circuit includes a driving voltage discharge path. The driving voltage discharge path is arranged between the undervoltage protection circuit and the activation switch. The driving voltage discharge path is used to be turned on when the voltage output by the rectifier circuit is greater than the second voltage threshold, so as to discharge the driving voltage through the driving voltage discharge path.

[0012] The first voltage threshold and the second voltage threshold are respectively the lower threshold and the upper threshold of the target voltage range.

[0013] In some embodiments, the undervoltage protection circuit includes a first energy storage circuit, a second energy storage circuit, and an undervoltage protection switch;

[0014] A first energy storage circuit, used for charging with the DC voltage output by the rectifier circuit;

[0015] The undervoltage protection switch is arranged on the energy storage path between the rectifier circuit and the second energy storage circuit, and the undervoltage protection switch is used to be turned on when the output voltage of the first energy storage circuit meets the conduction condition;

[0016] The second energy storage circuit is connected to the activation switch and is used to charge the voltage output by the rectifier circuit through the energy storage path when the undervoltage protection switch is turned on, and to output a driving voltage to the activation switch after charging.

[0017] In some embodiments, the undervoltage protection circuit further includes a first voltage regulator and a third energy storage circuit;

[0018] The first electrode and the second electrode of the undervoltage protection switch are arranged on the energy storage path; the first electrode, the control electrode, the first voltage regulator tube and the third energy storage circuit of the undervoltage protection switch are arranged on the first breakdown path in the undervoltage protection circuit, and the two ends of the first breakdown path are respectively connected to the two ends of the first energy storage circuit;

[0019] When the output voltage of the first energy storage circuit meets the conduction condition, the first voltage regulator tube is broken down and the undervoltage protection switch is turned on;

[0020] The third energy storage circuit is used to charge using the voltage output by the rectifier circuit when the undervoltage protection switch is turned on.

[0021] In some embodiments, the conduction conditions include: the output voltage of the first energy storage circuit is greater than the sum of the breakdown voltage of the second voltage regulator and the control electrode voltage of the undervoltage protection switch, and the third energy storage circuit is in a non-fully charged state.

[0022] In some embodiments, when the third energy storage circuit is in a fully charged state, the undervoltage protection switch is turned off.

[0023] In some embodiments, the undervoltage protection circuit further includes an energy storage discharge path;

[0024] The third energy storage circuit is used to discharge the discharged energy through the energy storage discharge path after the AC power supply is disconnected from output.

[0025] In some embodiments, two ends of the driving voltage discharge path in the overvoltage protection circuit are respectively connected to two ends of the second energy storage circuit; a discharge switch is provided on the driving voltage discharge path;

[0026] The discharge switch is used to be turned on when the voltage output by the rectifier circuit is greater than the second voltage threshold.

[0027] In some embodiments, the overvoltage protection circuit further includes a second voltage regulator and a fourth energy storage circuit;

[0028] The first and second electrodes of the discharge switch are arranged on the driving voltage discharge path;

[0029] The control electrode of the discharge switch, the second voltage regulator tube and the fourth energy storage circuit are arranged on the second breakdown path in the overvoltage protection circuit, and the two ends of the second breakdown path are connected to the output end of the rectifier circuit;

[0030] When the voltage output by the rectifier circuit is greater than the second voltage threshold, the second voltage regulator tube is broken down and the discharge switch is turned on.

[0031] In a second aspect, an embodiment of the present application provides an energy storage device, the energy storage device comprising: a BMS, a battery, and a BMS activation circuit as described in any one of the first aspects above;

[0032] Wherein, the BMS is connected to the BMS activation circuit and the battery respectively.

[0033] The above-mentioned BMS activation circuit and energy storage device, the BMS activation circuit may include: a rectifier circuit, a protection circuit and an activation circuit. Among them, the input end of the rectifier circuit can be connected to an AC power supply; the input end of the activation circuit can be connected to an activation voltage source, the output end of the activation circuit can be connected to the BMS, and the voltage output by the activation voltage source is used to activate the BMS; the protection circuit can be connected to the output end of the rectifier circuit and the activation circuit respectively, and is used to control the activation voltage path between the input end and the output end of the activation circuit to be turned on when the voltage output by the rectifier circuit is within the target voltage range, and is used to control the activation voltage path to be turned off when the voltage output by the rectifier circuit is outside the target voltage range. It can be seen that in the embodiment of the present application, the protection circuit can control the activation voltage path in the activation circuit to be turned on when the voltage output by the rectifier circuit is within the target voltage range, and control the activation voltage path to be turned off when the voltage output by the rectifier circuit is outside the target voltage range. This can flexibly control the BMS in the energy storage device to be activated only when the AC voltage belongs to the preset AC voltage range for normal operation of the energy storage device, which is not only beneficial to saving battery energy in the energy storage device, but also beneficial to protecting the battery in the energy storage device. It can be seen that compared with the button activation method in the related art, the BMS activation method provided in the embodiment of the present application can be more flexible and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0035] Figure 1 A schematic diagram of a BMS activation circuit provided in some embodiments of the present application;

[0036] Figure 2 A schematic diagram of a BMS activation circuit provided in some other embodiments of the present application;

[0037] Figure 3 A schematic diagram of a BMS activation circuit provided in some other embodiments of the present application;

[0038] Figure 4 A schematic diagram of a BMS activation circuit provided in some other embodiments of the present application;

[0039] Figure 5 A schematic diagram of a BMS activation circuit provided in some other embodiments of the present application;

[0040] Figure 6A schematic diagram of a BMS activation circuit provided in some other embodiments of the present application;

[0041] Figure 7 A schematic diagram of the structure of a BMS activation circuit provided in some other embodiments of the present application.

[0042] Description of reference numerals:

[0043] Activate voltage source P act , rectifier circuit 10, protection circuit 11, activation circuit 12, current limiting circuit 13, activation voltage path C act ;

[0044] Rectifier bridge DB1, first voltage-dividing resistor R1, third voltage-stabilizing tube ZD3, second voltage-dividing resistor R2;

[0045] Undervoltage protection circuit 110, first energy storage circuit 110A, second energy storage circuit 110B, undervoltage protection switch Q1, first voltage regulator ZD1, third energy storage circuit 110D, first electrode E of undervoltage protection switch Q1 le1 , the second electrode E of the undervoltage protection switch Q1 le2 , the control electrode E of the undervoltage protection switch Q1 le3 , current limiting resistor R3, capacitor C1, energy storage capacitor C2, time-limited on capacitor C3, time-limited on resistor R4;

[0046] Overvoltage protection circuit 111, driving voltage discharge path C dis1 , discharge switch Q2, second voltage regulator ZD2, fourth energy storage circuit 111A, capacitor C4, first electrode E of discharge switch Q2 le1 ', the second pole E of the discharge switch Q2 le2 ', the control electrode E of the discharge switch Q2 le3 ', current limiting resistor R5;

[0047] Activate switch U, current limiting resistor R6, filter capacitor C5, and pull-up resistor R7. DETAILED DESCRIPTION

[0048] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0050] It is understood that the terms "first", "second", etc. used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, without departing from the scope of this application, a first resistor may be referred to as a second resistor, and similarly, a second resistor may be referred to as a first resistor. Both the first resistor and the second resistor are resistors, but they are not the same resistor.

[0051] It can be understood that the “connection” in the following embodiments should be understood as “electrical connection”, “communication connection”, etc. if the connected circuits, modules, units, etc. have electrical signals or data transmission between each other.

[0052] With the development of battery technology and power electronics technology, energy storage devices are favored by more and more users, and more functional requirements are also put forward for energy storage devices, such as AC charging and PV charging. Among them, for AC charging function, AC alternating current activation charging is a major advantage of energy storage devices.

[0053] In the related art, when the presence of AC power is detected, the BMS in the energy storage device can be activated by pressing a button, so that the BMS controls the battery in the energy storage device to charge. However, the BMS activation method in the related art is relatively complicated.

[0054] In view of the problem that the BMS activation method in the related art is relatively cumbersome, the embodiment of the present application proposes that when the AC voltage is detected to be within the preset AC voltage range for normal operation of the energy storage device, the BMS in the energy storage device can be automatically activated to control the battery in the energy storage device to charge. It can be seen that the embodiment of the present application realizes a more flexible and convenient BMS activation method.

[0055] Illustratively, the battery in the embodiments of the present application may include, but is not limited to, any of the following: a lithium battery, a nickel-metal hydride battery, and a lithium polymer battery.

[0056] In some embodiments, Figure 1 A schematic diagram of a BMS activation circuit provided in some embodiments of the present application, such as Figure 1 As shown, the BMS activation circuit of the embodiment of the present application may include: a rectifier circuit 10 , a protection circuit 11 and an activation circuit 12 .

[0057] The input end of the rectifier circuit 10 in the embodiment of the present application can be connected to the AC power source P AC The connection can be used to rectify the AC power output by the AC power supply to obtain DC power. The waveform of DC power can be simply called DC wave (or steamed bun wave).

[0058] For example, the AC power source in the embodiment of the present application may come from a power grid, a self-contained power source (such as a diesel generator or a gas turbine) or a renewable energy source (such as solar energy or wind energy). The AC power source in the embodiment of the present application may include but is not limited to an AC voltage source or an AC current source.

[0059] Exemplarily, the rectifier circuit 10 in the embodiment of the present application may include but is not limited to a full-wave rectifier circuit or a bridge rectifier circuit.

[0060] The input terminal of the activation circuit 12 in the embodiment of the present application can be connected to the activation voltage source P act connection to activate the voltage source P act A voltage can be output to the activation circuit 12, wherein the activation voltage source P act The output voltage can be used to activate the BMS.

[0061] Exemplarily, the activation voltage source P act It may include but is not limited to: the positive electrode of the battery corresponding to the BMS, or a preset voltage source.

[0062] The output end of the activation circuit 12 in the embodiment of the present application can be connected to the BMS. For example, an activation voltage path C can be provided between the input end and the output end of the activation circuit 12. act It should be understood that in activating the voltage path C act In the on state, the voltage source P is activated act The output voltage can be transmitted to the BMS so that the BMS can be activated; in the activation voltage path C act In the off state, activate the voltage source P act The output voltage cannot be transmitted to the BMS.

[0063] The protection circuit 11 in the embodiment of the present application can be connected to the output end of the rectifier circuit 10 and the activation circuit 12 respectively, and is used to control the activation voltage path C between the input end and the output end of the activation circuit 12 when the voltage output by the rectifier circuit 10 is within the target voltage range. act is turned on and is used to control the activation voltage path C when the voltage output by the rectifier circuit 10 is outside the target voltage range. act Shut down.

[0064] The target voltage interval in the embodiment of the present application may be related to a preset AC voltage interval for normal operation of the energy storage device to which the BMS activation circuit belongs.

[0065] Exemplarily, the target voltage range may be a voltage range obtained by rectifying a preset alternating current voltage range.

[0066] As another example, the target voltage range may be a voltage range obtained by further adjusting the voltage range after rectification according to a preset adjustment step.

[0067] The input end of the protection circuit 11 in the embodiment of the present application can be connected to the output end of the rectifier circuit 10, and the output end of the protection circuit 11 can be connected to the activation voltage path C in the activation circuit 12. act The control end is connected to the rectifier circuit 10 so that the activation voltage path C can be controlled according to the voltage output by the rectifier circuit 10 and the target voltage interval. act On / off status.

[0068] In a possible implementation, when the voltage output by the rectifier circuit 10 is within the target voltage range, the protection circuit 11 can control the activation voltage path C in the activation circuit 12. act turns on, activating the voltage source P act The output voltage can be transmitted to the BMS, so as to activate the BMS. The voltage signal transmitted to the BMS can be called an activation signal (WAKE_UP).

[0069] In another possible implementation, when the voltage output by the rectifier circuit 10 is outside the target voltage range, the protection circuit 11 can control the activation voltage path C act turns off, so that the activation voltage source P act The output voltage cannot be transmitted to the BMS, so the BMS cannot be activated.

[0070] It should be noted that, when the voltage output by the rectifier circuit 10 is within the target voltage range, the AC voltage belongs to the preset AC voltage range for normal operation of the energy storage device. When the voltage output by the rectifier circuit 10 is outside the target voltage range, the AC voltage does not belong to the preset AC voltage range for normal operation of the energy storage device.

[0071] For example, when the voltage output by the rectifier circuit 10 is less than the lower threshold of the target voltage range, the protection circuit 11 can control the activation voltage path C act turns off, so that the activation voltage source P act The output voltage cannot be transmitted to the BMS, so the BMS cannot be activated, which can prevent the BMS in the energy storage device from being ineffectively activated when the AC voltage is lower than the lower threshold of the preset AC voltage range, which is beneficial to saving battery energy in the energy storage device.

[0072] For another example, when the voltage output by the rectifier circuit 10 is greater than the upper threshold of the target voltage range, the protection circuit 11 can control the activation voltage path C act turns off, so that the activation voltage source P actThe output voltage cannot be transmitted to the BMS, so the BMS cannot be activated, which can prevent the BMS in the energy storage device from being activated when the AC voltage is higher than the upper threshold of the preset AC voltage range, thereby helping to protect the battery in the energy storage device.

[0073] In summary, the BMS activation circuit in the embodiment of the present application may include: a rectifier circuit, a protection circuit and an activation circuit. Among them, the input end of the rectifier circuit can be connected to an AC power supply; the input end of the activation circuit can be connected to an activation voltage source, the output end of the activation circuit can be connected to a BMS, and the voltage output by the activation voltage source is used to activate the BMS; the protection circuit can be connected to the output end of the rectifier circuit and the activation circuit respectively, and is used to control the activation voltage path between the input end and the output end of the activation circuit when the voltage output by the rectifier circuit is within the target voltage interval, and is used to control the activation voltage path to be turned off when the voltage output by the rectifier circuit is outside the target voltage interval. It can be seen that in the embodiment of the present application, the protection circuit can control the activation voltage path in the activation circuit to be turned on when the voltage output by the rectifier circuit is within the target voltage interval, and control the activation voltage path to be turned off when the voltage output by the rectifier circuit is outside the target voltage interval. The BMS in the energy storage device can be flexibly controlled to be activated only when the AC voltage belongs to the preset AC voltage interval for normal operation of the energy storage device, which is not only beneficial to saving battery energy in the energy storage device, but also beneficial to protecting the battery in the energy storage device. It can be seen that compared with the button activation method in the related art, the BMS activation method provided in the embodiment of the present application can be more flexible and convenient.

[0074] In some embodiments, Figure 2 This is a schematic diagram of the structure of the BMS activation circuit provided in some other embodiments of the present application. In the embodiments of the present application, the activation voltage path C act The relevant contents of the protection circuit 11 are described as examples. Figure 2 As shown, the activation voltage path C of the embodiment of the present application act An activation switch U may be provided on the circuit board so that the activation voltage path C can be adjusted. act It should be understood that when the activation switch U is in the on state, the activation voltage path C act In the on state; when the activation switch U is in the off state, the activation voltage path C act In the off state.

[0075] For example, considering the requirement for reinforced insulation design between AC and BMS, the activation switch U in the embodiment of the present application may be an electrical isolation (or signal isolation) device. For example, the activation switch U may include but is not limited to any of the following: an optocoupler insulation isolation switch, a magnetic coupling switch, a relay, and a solid-state relay.

[0076] The protection circuit 11 of the embodiment of the present application may include an undervoltage protection circuit 110 and an overvoltage protection circuit 111. The undervoltage protection circuit 110 is connected to the output end of the rectifier circuit 10 and the activation switch U respectively, and can be used to output a driving voltage when the voltage output by the rectifier circuit 10 is greater than or equal to the first voltage threshold, and the driving voltage can be used to drive the activation switch U to turn on. The first voltage threshold may be the lower limit threshold of the target voltage interval.

[0077] Exemplarily, the undervoltage protection circuit 110 can be used to output a driving voltage when the voltage output by the rectifier circuit 10 is greater than or equal to the first voltage threshold, wherein the driving voltage can refer to the voltage required for the activation switch U to be turned on, so that the activation switch U can be turned on, that is, the activation voltage path C in the activation circuit 12 is turned on. act turns on, activating the voltage source P act The output voltage can be transmitted to the BMS, so that the BMS can be activated.

[0078] It should be understood that the "A and B are connected" involved in the embodiments of the present application may include but is not limited to: A and B are directly connected, or A and B are indirectly connected (for example, A can be indirectly connected to B through C).

[0079] Exemplarily, the undervoltage protection circuit 110 in the embodiment of the present application can be directly connected to the output end of the rectifier circuit 10, or the undervoltage protection circuit 110 can be connected to the output end of the rectifier circuit 10 through a current limiting circuit. Among them, the current limiting circuit can be used to limit the output current of the rectifier circuit 10 to reduce the input voltage transmitted to the protection circuit 11, which can avoid the subsequent circuit from being damaged by the high voltage as much as possible, which is conducive to protecting the subsequent circuit.

[0080] As another example, the undervoltage protection circuit 110 in the embodiment of the present application may be directly connected to the activation switch U, or the undervoltage protection circuit 110 may be connected to the activation switch U through the overvoltage protection circuit 111 .

[0081] The overvoltage protection circuit 111 in the embodiment of the present application can be connected to the output end of the rectifier circuit 10. The overvoltage protection circuit 111 can include a driving voltage discharge path C dis1 , driving voltage discharge path C dis1 It can be set between the undervoltage protection circuit 110 and the activation switch U to drive the voltage discharge path C dis1 It can be used to conduct when the voltage output by the rectifier circuit 111 is greater than the second voltage threshold, so as to discharge the voltage through the driving voltage discharge path C dis1 Discharge driving voltage. The second voltage threshold may be an upper threshold of the target voltage interval.

[0082] For example, the driving voltage discharge path C of the embodiment of the present application dis1 The rectifier circuit 111 can be turned on when the voltage outputted by the rectifier circuit 111 is greater than the second voltage threshold, so as to discharge the voltage through the driving voltage discharge path C dis1 The driving voltage output by the undervoltage protection circuit 110 is discharged so that the voltage transmitted to the activation switch U through the overvoltage protection circuit 111 cannot meet the voltage required for the activation switch U to be turned on, so that the activation switch U cannot be turned on, that is, the activation voltage path C in the activation circuit 12 act turns off, so that the activation voltage source P act The output voltage cannot be transmitted to the BMS, so the BMS cannot be activated.

[0083] In summary, in the embodiments of the present application, on the one hand, the undervoltage protection circuit in the protection circuit outputs a driving voltage when the voltage output by the rectifier circuit is greater than or equal to the first voltage threshold, so as to drive the activation switch to turn on, so that the BMS in the energy storage device can be activated when the AC voltage is greater than or equal to the lower threshold of the preset AC voltage interval, so as to control the battery in the energy storage device to charge effectively. On the other hand, the overvoltage protection circuit in the protection circuit is turned on when the voltage output by the rectifier circuit is greater than the second voltage threshold, so as to discharge the driving voltage through the driving voltage discharge path, so that the BMS in the energy storage device cannot be activated when the AC voltage is greater than the upper threshold of the preset AC voltage interval, thereby facilitating the protection of the battery in the energy storage device.

[0084] In some embodiments, Figure 3 This is a schematic diagram of the structure of the BMS activation circuit provided in some other embodiments of the present application. The embodiments of the present application provide an exemplary introduction to the relevant contents of the above-mentioned undervoltage protection circuit 110. Figure 3 As shown, the undervoltage protection circuit 110 of the embodiment of the present application may include: a first energy storage circuit 110A, a second energy storage circuit 110B and an undervoltage protection switch Q1. Exemplarily, the undervoltage protection switch Q1 in the embodiment of the present application may include but is not limited to any of the following: a triode, a metal oxide semiconductor (MOS) tube, and an insulated gate bipolar transistor (IGBT).

[0085] The first energy storage circuit 110A in the embodiment of the present application can be connected to the output end of the rectifier circuit 10 to be charged using the DC voltage output by the rectifier circuit 10 .

[0086] The undervoltage protection switch Q1 in the embodiment of the present application can be arranged on the energy storage path between the rectifier circuit 10 and the second energy storage circuit 110B. The undervoltage protection switch Q1 can be used to be turned on when the output voltage of the first energy storage circuit 110A meets the conduction condition, so that the voltage output by the rectifier circuit 10 can be used to charge the second energy storage circuit 110B. Among them, the conduction condition in the embodiment of the present application may include but is not limited to the conduction condition of the undervoltage protection switch Q1. For example, the conduction condition of the undervoltage protection switch Q1 may include but is not limited to the output voltage of the first energy storage circuit 110A being greater than the voltage required for the undervoltage protection switch Q1 to be turned on.

[0087] The second energy storage circuit 110B in the embodiment of the present application can be connected to the activation switch U, and can be used to charge the voltage output by the rectifier circuit 10 through the energy storage path when the undervoltage protection switch Q1 is turned on, and can be used to output a driving voltage to the activation switch U after charging to drive the activation switch U to turn on.

[0088] For example, when the voltage output by the second energy storage circuit 110B is greater than the driving voltage (or the voltage required for the activation switch U to turn on), the driving voltage can be output to the activation switch U to drive the activation switch U to turn on, so that the activation voltage source P act The output voltage can be transmitted to the BMS, so that the BMS can be activated.

[0089] It should be noted that, when the voltage output by the rectifier circuit 10 is greater than or equal to the first voltage threshold, the output voltage of the first energy storage circuit 110A can meet the conduction condition of the undervoltage protection switch Q1, so that the second energy storage circuit 110B can be charged using the voltage output by the rectifier circuit 10, and after charging, it can output a driving voltage to the activation switch U.

[0090] In summary, in the embodiment of the present application, the undervoltage protection circuit may include a first energy storage circuit, a second energy storage circuit and an undervoltage protection switch. The first energy storage circuit is charged with the DC voltage output by the rectifier circuit, and the undervoltage protection switch is turned on when the output voltage of the first energy storage circuit meets the turn-on condition, so that the second energy storage circuit is charged with the voltage output by the rectifier circuit through the energy storage path, and outputs a driving voltage to the activation switch after charging. This achieves the ability to accurately and flexibly adjust the on-off state of the activation switch according to the voltage output by the rectifier circuit, thereby accurately and flexibly controlling the activation state of the BMS.

[0091] In some embodiments, Figure 4 This is a schematic diagram of the structure of the BMS activation circuit provided in some other embodiments of the present application. The embodiments of the present application further introduce and explain the relevant contents of the above-mentioned undervoltage protection circuit 110. Figure 4As shown, the undervoltage protection circuit 110 of the embodiment of the present application may further include a first voltage regulator tube ZD1 and a third energy storage circuit 110D.

[0092] The first electrode E of the undervoltage protection switch Q1 in the embodiment of the present application le1 and the second pole E le2 It can be set on the energy storage path; the first pole E of the undervoltage protection switch Q1 le1 , control electrode E le3 , the first voltage regulator tube ZD1 and the third energy storage circuit 110D can be arranged on the first breakdown path in the undervoltage protection circuit 110, and the two ends of the first breakdown path can be connected to the two ends of the first energy storage circuit 110A respectively.

[0093] Among them, when the output voltage of the first energy storage circuit 110A meets the conduction condition, the first voltage regulator ZD1 is broken down and the undervoltage protection switch Q1 is turned on, not only can the voltage output by the rectifier circuit 10 be used to charge the second energy storage circuit 110B, but also the voltage output by the rectifier circuit 10 can be used to charge the third energy storage circuit 110D.

[0094] Exemplarily, the conduction conditions in the embodiment of the present application may include but are not limited to: the output voltage of the first energy storage circuit 110A may be greater than the sum of the breakdown voltage of the first voltage regulator ZD1 and the control electrode voltage of the undervoltage protection switch Q1, and the third energy storage circuit 110D is in a non-fully charged state. Among them, the third energy storage circuit 110D being in a non-fully charged state may include but is not limited to the third energy storage circuit 110D being in a non-charging state, or the third energy storage circuit 110D being in a charging state but not yet reaching a fully charged state.

[0095] It should be understood that when the first voltage regulator tube ZD1 is just broken down and the undervoltage protection switch Q1 is just turned on, the voltage across the third energy storage circuit 110D is zero. As the first voltage regulator tube ZD1 is broken down and the duration of the undervoltage protection switch Q1 being turned on increases, the voltage output by the rectifier circuit 10 is used to charge the third energy storage circuit 110D (i.e., the third energy storage circuit 110D is in a charging state), so that the voltage across the third energy storage circuit 110D will also increase accordingly.

[0096] In some embodiments, when the voltage output by the rectifier circuit 10 is in the fully charged state of the third energy storage circuit 110D, since no current flows through the third energy storage circuit 110D at this time, the third energy storage circuit 110D is equivalent to being in an open circuit state, that is, the control electrode E of the third energy storage circuit 110D, the first voltage regulator tube ZD1 and the undervoltage protection switch Q1 le3The path is in an open circuit state, so that the undervoltage protection switch Q1 is turned off (or cut off), and the voltage output by the rectifier circuit 10 cannot be used to continue to charge the second energy storage circuit 110B, so that the second energy storage circuit 110B starts to discharge, and when the electric energy stored in the second energy storage circuit 110B is less than the driving voltage, the driving voltage cannot be continued to be output to the activation switch U, so that the activation switch U is switched from the on state to the off state, and the BMS cannot be activated.

[0097] In one possible implementation, when the charging time for charging the third energy storage circuit 110D using the voltage output by the rectifier circuit 10 is greater than or equal to a preset time threshold (which may include but is not limited to the charging time required for the third energy storage circuit 110D to reach a fully charged state), the third energy storage circuit 110D is in a fully charged state.

[0098] In another possible implementation, when the voltage across the third energy storage circuit 110D is greater than or equal to a preset voltage threshold (which may include but is not limited to the voltage across the third energy storage circuit 110D corresponding to the third energy storage circuit 110D reaching a fully charged state), the third energy storage circuit 110D is in a fully charged state.

[0099] Of course, the third energy storage circuit 110D may also determine whether it is in a fully charged state in other ways.

[0100] It can be seen that in the embodiment of the present application, by setting the first voltage regulator and the third energy storage circuit in the undervoltage protection circuit, and when the output voltage of the first energy storage circuit meets the conduction condition, the first voltage regulator is broken down, and the undervoltage protection switch is turned on. When the voltage output by the rectifier circuit is greater than the first voltage threshold, the duration of the activation switch being in the on state can be controlled to control the duration of the BMS being activated, thereby avoiding the BMS from being in the activated state all the time, so that the BMS can be powered off normally when it needs to be powered off, which is beneficial to protecting the BMS and the energy storage equipment.

[0101] In some embodiments, in order to ensure that the undervoltage protection switch Q1 can be normally turned on in the subsequent process, such as Figure 4 As shown, the undervoltage protection circuit 110 of the embodiment of the present application may also include an energy storage discharge path C dis2 Among them, the third energy storage circuit 110D can be used to discharge the energy through the energy storage discharge path C after the AC power supply is disconnected. dis2 The discharge energy can reduce the voltage across the third energy storage circuit 110D to zero, which is beneficial for the output voltage of the first energy storage circuit to meet the conduction condition during the next AC power activation of the BMS, so that the first voltage regulator ZD1 can be broken down and the undervoltage protection switch can be turned on.

[0102] In some embodiments, Figure 5 This is a schematic diagram of the structure of the BMS activation circuit provided in some other embodiments of the present application. The embodiments of the present application provide an exemplary introduction to the relevant contents of the above-mentioned overvoltage protection circuit 111. Figure 5 As shown, the driving voltage discharge path C in the overvoltage protection circuit 111 in the embodiment of the present application dis1 The two ends of the drive voltage discharge path C can be connected to the two ends of the second energy storage circuit 110B respectively; dis1 A discharge switch Q2 is disposed on the upper portion. Exemplarily, the discharge switch Q2 in the embodiment of the present application may include but is not limited to any one of the following: a triode, a MOS tube, and an IGBT.

[0103] The discharge switch Q2 in the embodiment of the present application can be used to be turned on when the voltage output by the rectifier circuit 10 is greater than the second voltage threshold to discharge the electric energy stored in the second energy storage circuit 110B, so that the second energy storage circuit 110B cannot continue to output the driving voltage to the activation switch U, so that the activation switch U is in the off state, thereby failing to activate the BMS.

[0104] It can be seen that in the embodiment of the present application, a discharge switch is provided on the driving voltage discharge path, and the discharge switch is turned on when the voltage output by the rectifier circuit is greater than the second voltage threshold, so as to discharge the electric energy stored in the second energy storage circuit. In this way, when the AC voltage is greater than the upper threshold of the preset AC voltage range, the BMS in the energy storage device can be flexibly adjusted to an inactivated state, thereby facilitating the protection of the energy storage device.

[0105] It should be understood that when the discharge switch Q2 is in the on state, the driving voltage discharge path C dis1 In the on state; when the discharge switch Q2 is in the off state, the driving voltage discharge path C dis1 In the off state.

[0106] In some embodiments, Figure 6 This is a schematic diagram of the structure of the BMS activation circuit provided in some other embodiments of the present application. The embodiments of the present application further introduce and illustrate the relevant contents of the above-mentioned overvoltage protection circuit 111. Figure 6 As shown, the overvoltage protection circuit 111 of the embodiment of the present application may further include a second voltage regulator tube ZD2 and a fourth energy storage circuit 111A.

[0107] The first electrode E of the discharge switch Q2 in the embodiment of the present application le1 ' and the second pole E le2 'Can be set in the drive voltage discharge path C dis1 Upper; control electrode E of discharge switch Q2 le3', the second voltage regulator tube ZD2 and the fourth energy storage circuit 111A can be arranged on the second breakdown path in the overvoltage protection circuit 111, and the two ends of the second breakdown path can be connected to the output end of the rectifier circuit 10, so that the on-off state of the second voltage regulator tube ZD2 and the discharge switch Q2 can be adjusted in time according to the voltage output by the rectifier circuit 10.

[0108] Among them, when the voltage output by the rectifier circuit 10 is greater than the second voltage threshold, the second voltage regulator ZD2 is broken down, and the discharge switch Q2 is turned on to discharge the electric energy stored in the second energy storage circuit 110B, so that the second energy storage circuit 110B can no longer output the driving voltage to the activation switch U, so that the activation switch U is in the off state, thereby failing to activate the BMS.

[0109] It should be noted that other devices may be provided on any path involved in the embodiments of the present application according to actual needs, and examples will not be given one by one in the embodiments of the present application.

[0110] In some embodiments, Figure 7 The schematic diagram of the structure of the BMS activation circuit provided in some other embodiments of the present application is based on the above embodiments. In the embodiments of the present application, the rectifier circuit 10 is a full-wave rectifier circuit, the undervoltage protection switch Q1 is a PNP transistor, the discharge switch Q2 is an NPN transistor, the activation switch U is an optocoupler insulation isolation switch, and the activation voltage source P is used. act Taking the positive electrode of the battery corresponding to the BMS as an example, the BMS activation circuit is described in detail. Figure 7 As shown, the BMS activation circuit of the embodiment of the present application may include: a rectifier circuit 10, a current limiting circuit 13, a protection circuit 11 and an activation circuit 12. Among them, the protection circuit 11 may include an undervoltage protection circuit 110 and an overvoltage protection circuit 111, and the current limiting circuit 13 may be arranged between the rectifier circuit 10 and the undervoltage protection circuit 110.

[0111] For ease of understanding, the following embodiments of the present application first provide an exemplary introduction to the relevant structural contents of each circuit in the BMS activation circuit.

[0112] 1) Rectifier circuit 10

[0113] The input end of the rectifier circuit 10 in the embodiment of the present application can be connected to the AC power source P AC The connection can be used to rectify the AC power output by the AC power supply to obtain DC power.

[0114] Exemplarily, the rectifier circuit 10 of the embodiment of the present application is a full-wave rectifier circuit, wherein the full-wave rectifier circuit may include but is not limited to a rectifier bridge DB1.

[0115] 2) Current limiting circuit 13

[0116] The current limiting circuit 13 of the embodiment of the present application may be connected to the output end of the rectifier circuit 10 to limit the output current of the rectifier circuit 10 so as to reduce the input voltage transmitted to the protection circuit 11 .

[0117] Exemplarily, the current limiting circuit 13 may include but is not limited to a first voltage-dividing resistor R1, a third voltage-regulating tube ZD3, and a second voltage-dividing resistor R2. The first end of the first voltage-dividing resistor R1 is connected to the output end of the rectifier circuit 10, the second end of the first voltage-dividing resistor R1 is connected to the negative electrode of the third voltage-regulating tube ZD3, the positive electrode of the third voltage-regulating tube ZD3 and the first end of the second voltage-dividing resistor R2 are both connected to the first end of the first energy storage circuit 110A in the undervoltage protection circuit 110, and the second end of the second voltage-dividing resistor R2 is connected to the second end of the first energy storage circuit 110A. The first energy storage circuit 110A may include but is not limited to a capacitor C1, and the capacitor C1 has not only an energy storage function, but also a filtering function.

[0118] In the embodiment of the present application, the output current of the rectifier circuit 10 can be current limited after passing through the first voltage-dividing resistor R1 and the third voltage-dividing resistor ZD3, wherein the third voltage-dividing resistor ZD3, the first voltage-dividing resistor R1 and the second voltage-dividing resistor R2 can respectively divide part of the voltage, which can reduce the input voltage of the protection circuit 11, and is beneficial to protect the subsequent circuit from being damaged by high voltage.

[0119] 3) Undervoltage protection circuit 110

[0120] The undervoltage protection circuit 110 in the embodiment of the present application may include but is not limited to: a first energy storage circuit 110A, a second energy storage circuit 110B, an undervoltage protection switch Q1, a first voltage regulator ZD1, a third energy storage circuit 110D, and an energy storage discharge path. Among them, the second energy storage circuit 110B may include but is not limited to an energy storage capacitor C2, and the third energy storage circuit 110D may include but is not limited to a time-limited conduction capacitor C3; the energy storage discharge path C may include but is not limited to a diode D1 and a second voltage-dividing resistor R2 in the current limiting circuit 13.

[0121] For example, the first terminal of the first energy storage circuit 110A can be connected to the first electrode E of the undervoltage protection switch Q1. le1 Connect the second pole E of the undervoltage protection switch Q1 le2 The current limiting resistor R3 and the second electrode E of the discharge switch Q2 in the overvoltage protection circuit 111 can be connected. le2 'Connected. The first end of the second energy storage circuit 110B can be connected to the second electrode E of the undervoltage protection switch Q1. le2 The second end of the second energy storage circuit 110B is connected to the current limiting resistor R3, and the second end of the second energy storage circuit 110B can be connected to the second end of the first energy storage circuit 110A.

[0122] For example, the control electrode E of the undervoltage protection switch Q1 le3 The cathode of the first voltage regulator ZD1 is connected to the cathode of the first voltage regulator ZD1, the anode of the first voltage regulator ZD1 can be connected to the first end of the third energy storage circuit 110D through the time-limited on resistor R4, and the second end of the third energy storage circuit 110D can be connected to the second end of the first energy storage circuit 110A. The anode of the diode D1 can be connected to the first end of the third energy storage circuit 110D, and the cathode of the diode D1 can be connected to the first end of the first energy storage circuit 110A.

[0123] For example, when the undervoltage protection switch Q1 is a PNP transistor, the first electrode E of the undervoltage protection switch Q1 le1 It can be the emitter, the second pole E of the undervoltage protection switch Q1 le2 It can be the collector, the control electrode E of the undervoltage protection switch Q1 le3 Can be the base.

[0124] For example, when the discharge switch Q2 is an NPN transistor, the first electrode E of the discharge switch Q2 le1 ' can be the emitter, the second pole E of the discharge switch Q2 le2 ' can be the collector, the control electrode E of the discharge switch Q2 le3 ' can be the base.

[0125] 4) Overvoltage protection circuit 111

[0126] The overvoltage protection circuit 111 in the embodiment of the present application may include but is not limited to a discharge switch Q2, a second voltage regulator ZD2 and a fourth energy storage circuit 111A arranged on the driving voltage discharge path. The fourth energy storage circuit 111A may include but is not limited to a capacitor C4.

[0127] For example, the second electrode E of the discharge switch Q2 le2 ' can be connected to the current limiting resistor R3 and the activation circuit 12 respectively, and the first electrode E of the discharge switch Q2 le1 The cathode of the second voltage regulator tube ZD2 can be connected to the first electrode E of the undervoltage protection switch Q1. le1 The anode of the second voltage regulator tube ZD2 can be connected to the control electrode E of the discharge switch Q2 through the current limiting resistor R5. le3 ' is connected to the first end of the fourth energy storage circuit 111A.

[0128] 5) Activate circuit 12

[0129] The input end of the activation circuit 12 in the embodiment of the present application can be connected to the activation voltage source P through the pull-up resistor R7. actThe output end of the activation circuit 12 can be connected to the BMS, and an activation switch U can be provided between the input end and the output end of the activation circuit 12. act It may include but is not limited to the positive electrode of the battery corresponding to the BMS; the activation switch U may include but is not limited to an optocoupler insulation isolation switch.

[0130] For example, the first terminal of the activation switch U can be connected to the second terminal E of the discharge switch Q2 through the current limiting resistor R6. le2 'Connection, the second end of the activation switch U can be connected to the first pole E of the discharge switch Q2 le1 In addition, the output end of the activation switch U can also be grounded through the filter capacitor C5.

[0131] It should be noted that the function of the current limiting resistor R6 may include but is not limited to: when the discharge switch Q2 is turned on, it is necessary to ensure that the voltage between the second electrode and the first electrode of the discharge switch Q2 cannot meet the driving voltage of the activation switch U, so that the activation switch U can be reliably turned off.

[0132] The following embodiments of the present application provide an exemplary introduction and description of the related control processes of each circuit in the BMS activation circuit.

[0133] 1) After the AC power output by the AC power source passes through the rectifier circuit 10 and the current limiting circuit 13, a voltage can be established across the capacitor C1 in the first energy storage circuit 110A. When the voltage across the capacitor C1 (i.e., the output voltage of the first energy storage circuit 110A) is greater than the sum of the breakdown voltage of the first voltage regulator ZD1 and the control electrode voltage of the undervoltage protection switch Q1 (i.e., the output voltage of the first energy storage circuit 110A meets the conduction condition), the first voltage regulator ZD1 is broken down and the undervoltage protection switch Q1 is turned on. On the one hand, the current can pass through the control electrode E of the undervoltage protection switch Q1. le3 , the first voltage regulator tube ZD1 and the time-limited conduction resistor R4 charge the time-limited conduction capacitor C3 in the third energy storage circuit 110D. On the other hand, the current can pass through the second electrode E of the undervoltage protection switch Q1. le2 The energy storage capacitor C2 in the second energy storage circuit 110B is charged.

[0134] For example, the parameters of the first voltage-dividing resistor R1 and the third voltage-stabilizing tube ZD3 in the embodiment of the present application can be selected and designed according to the preset voltage requirements across the capacitor C1 in the first energy storage circuit 110A.

[0135] 2) When the voltage across the energy storage capacitor C2 (i.e., the voltage output by the second energy storage circuit 110B) is greater than or equal to the driving voltage of the activation switch U (or the voltage required for the activation switch U to turn on), the driving voltage can be output to the activation switch U to drive the activation switch U to turn on, so that the activation voltage source Pact The output voltage (i.e., the active signal on the battery side) can be transmitted to the BMS, thereby activating the BMS. The voltage signal transmitted to the BMS can be called an activation signal (WAKE_UP).

[0136] It should be noted that, when the voltage output by the rectifier circuit 10 is greater than or equal to the lower threshold value of the target voltage interval (i.e., the first voltage threshold value), the output voltage of the first energy tank circuit 110A can meet the conduction condition, the first voltage regulator tube ZD1 can be broken down, and the undervoltage protection switch Q1 can be turned on, so that the energy storage capacitor C2 in the second energy tank circuit 110B can be charged by the voltage output by the rectifier circuit 10, and after charging, it can output a driving voltage to the activation switch U. When the voltage output by the rectifier circuit 10 is less than the lower threshold value of the target voltage interval (i.e., the first voltage threshold value), the output voltage of the first energy tank circuit 110A cannot meet the conduction condition, the first voltage regulator tube ZD1 cannot be broken down, and the undervoltage protection switch Q1 is turned off, that is, the activation switch U cannot be turned on, so that the activation voltage source P act The output voltage cannot be transmitted to the BMS, so the BMS cannot be activated, which can prevent the BMS in the energy storage device from being ineffectively activated when the AC voltage is lower than the preset AC voltage range, which is beneficial to saving battery energy in the energy storage device.

[0137] For example, the parameters of the first voltage regulator ZD1 and the time-limited on-resistor R4 in the embodiment of the present application can be selected and designed according to the preset minimum AC voltage for normal operation of the energy storage device (i.e., the lower limit threshold of the preset AC voltage range). When the AC voltage is lower than the preset minimum AC voltage for normal operation of the energy storage device, the first voltage regulator ZD1 cannot be broken down and the undervoltage protection switch Q1 is turned off, so that the subsequent circuit cannot be powered and the BMS cannot be activated, thereby preventing the BMS in the energy storage device from being ineffectively activated when the AC voltage is lower than the preset minimum AC voltage for normal operation of the energy storage device, which is beneficial to saving battery energy in the energy storage device.

[0138] 3) When the time-limited conduction capacitor C3 in the third energy storage circuit 110D is in a fully charged state, since no current will flow through the time-limited conduction capacitor C3 at this time, the time-limited conduction capacitor C3 is equivalent to being in an open circuit state, that is, the time-limited conduction capacitor C3, the first voltage regulator tube ZD1 and the control electrode E of the undervoltage protection switch Q1 are le3The path is in an open circuit state, so that the undervoltage protection switch Q1 is turned off, and the voltage output by the rectifier circuit 10 cannot be used to continue to charge the energy storage capacitor C2 in the second energy storage circuit 110B, so that the energy storage capacitor C2 in the second energy storage circuit 110B starts to discharge, and when the voltage output by the second energy storage circuit 110B is less than the driving voltage of the activation switch U, it is impossible to continue to output the driving voltage to the activation switch U, so that the activation switch U switches from the on state to the off state, and thus the BMS cannot be activated. It can be seen that the embodiment of the present application can control the duration of the activation switch U being in the on state when the voltage output by the rectifier circuit is greater than the first voltage threshold, so as to control the duration of the BMS being activated, thereby avoiding the BMS from being in the activated state all the time, so that the BMS can be powered off normally when it needs to be powered off, which is beneficial to protecting the BMS and the energy storage device.

[0139] Exemplarily, the parameters of the time-limited on-resistance R4, the time-limited on-capacitor C3 and the energy storage capacitor C2 in the embodiment of the present application can be selected and designed according to the duration of the activation of the BMS.

[0140] It should be noted that after the AC power is disconnected, when the voltage across the capacitor C1 in the first energy storage circuit 110A is lower than the voltage across the time-limited conduction capacitor C3, the time-limited conduction capacitor C3 can be discharged through the diode D1 using the second voltage-dividing resistor R2 to prepare for the next AC power input activation. In addition, after the AC power is disconnected, the capacitor C1 in the energy storage circuit 110A can also be discharged using the second voltage-dividing resistor R2 to prepare for the next AC power input activation.

[0141] 4) When the voltage output by the rectifier circuit 10 is greater than the upper threshold value of the target voltage range (i.e., the second voltage threshold value), the second voltage regulator tube ZD2 is broken down, and the discharge switch Q2 is turned on to discharge the electric energy stored in the second energy storage circuit 110B through the driving voltage discharge path, so that the second energy storage circuit 110B cannot continue to output the driving voltage to the activation switch U, so that the activation switch U is in the off state, thereby failing to activate the BMS, which can prevent the BMS in the energy storage device from being activated when the AC voltage is higher than the preset AC voltage range, and is beneficial to protecting the energy storage device.

[0142] For example, the parameters of the second voltage regulator tube ZD2 and the current limiting resistor R5 in the embodiment of the present application can be selected and designed according to the preset maximum AC voltage (i.e., the upper threshold of the preset AC voltage range) for the normal operation of the energy storage device. When the AC voltage is higher than the preset maximum AC voltage for the normal operation of the energy storage device, the second voltage regulator tube ZD2 can be broken down and the discharge switch Q2 can be turned on to prohibit the activation switch U from being turned on, and the BMS cannot be activated, thereby preventing the BMS in the energy storage device from being activated when the AC voltage is higher than the preset maximum AC voltage for the normal operation of the energy storage device, which is beneficial to protecting the energy storage device.

[0143] It should be noted that the sampling point of the overvoltage protection circuit 111 of this embodiment is set at the first electrode E of the undervoltage protection switch Q1. le1 The protection point of the overvoltage protection circuit 111 is set at the second end of the current limiting resistor R3 (ie, the second electrode E of the discharge switch Q2). le2 ' is connected to one end of the rectifier circuit 10 so that when the voltage output by the rectifier circuit 10 is greater than the upper threshold of the target voltage interval (i.e., the second voltage threshold), the undervoltage protection switch Q1 and the discharge switch Q2 can be turned on, so that the input voltage can be discharged through the undervoltage protection switch Q1 and the discharge switch Q2, which is beneficial to protecting the subsequent circuit. However, when the time-limited conduction capacitor C3 in the third energy storage circuit 110D is fully charged, the undervoltage protection switch Q1 is turned off, that is, the first electrode E of the discharge switch Q2 is turned off. le1 ', the second voltage dividing resistor R2, the current limiting resistor R3 and the second electrode E of the discharge switch Q2 le2 The formed discharge loop is in an open circuit state, so the overvoltage protection circuit 111 will not continue to work, thereby saving power loss.

[0144] In summary, the BMS activation circuit of the embodiment of the present application can, on the basis of realizing the function of automatically activating the BMS by AC power, control the BMS in the energy storage device to be activated when the AC voltage belongs to the preset AC voltage interval for normal operation of the energy storage device through the undervoltage protection circuit, the overvoltage protection circuit and the activation circuit. This can not only prevent the BMS in the energy storage device from being ineffectively activated when the AC voltage is lower than the preset minimum AC voltage for normal operation of the energy storage device, but also effectively reduce the power consumption of the BMS activation circuit, thereby facilitating saving battery energy in the energy storage device, and also prevent the BMS in the energy storage device from being activated when the AC voltage is higher than the preset maximum AC voltage for normal operation of the energy storage device, thereby facilitating protecting the energy storage device. Furthermore, the embodiment of the present application can also effectively control the duration of the BMS being activated, thereby facilitating protecting the BMS and the energy storage device.

[0145] In some embodiments, the embodiments of the present application may also provide an energy storage device, which may include but is not limited to: a BMS, a battery, and a BMS activation circuit; wherein the BMS may be connected to the BMS activation circuit and the battery, respectively. It should be noted that the implementation method of the BMS activation circuit can refer to the relevant content in the above-mentioned BMS activation circuit embodiment of the present application, which will not be repeated here.

[0146] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0147] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A BMS activation circuit, characterized in that: The BMS activation circuit includes: a rectifier circuit, a protection circuit and an activation circuit; Wherein, the input end of the rectifier circuit is connected to an AC power supply; The input end of the activation circuit is connected to an activation voltage source, the output end of the activation circuit is connected to a BMS, and the voltage output by the activation voltage source is used to activate the BMS; a protection circuit, the protection circuit being connected to the output end of the rectifier circuit and the activation circuit respectively, and being used to control the activation voltage path between the input end and the output end of the activation circuit to be turned on when the voltage output by the rectifier circuit is within the target voltage interval, and being used to control the activation voltage path to be turned off when the voltage output by the rectifier circuit is outside the target voltage interval; Wherein, an activation switch is provided on the activation voltage path; the protection circuit includes an undervoltage protection circuit; The undervoltage protection circuit is connected to the output end of the rectifier circuit and the activation switch respectively, and is used to output a driving voltage when the voltage output by the rectifier circuit is greater than or equal to a first voltage threshold, and the driving voltage is used to drive the activation switch to turn on; wherein the first voltage threshold is a lower limit threshold of the target voltage range; Wherein, the undervoltage protection circuit includes a first energy storage circuit, a second energy storage circuit and an undervoltage protection switch; The first energy storage circuit is used to charge using the DC voltage output by the rectifier circuit; The undervoltage protection switch is arranged on the energy storage path between the rectifier circuit and the second energy storage circuit, and the undervoltage protection switch is used to be turned on when the output voltage of the first energy storage circuit meets the conduction condition; The second energy storage circuit is connected to the activation switch, and is used to charge the voltage output by the rectifier circuit through the energy storage path when the undervoltage protection switch is turned on, and to output the driving voltage to the activation switch after charging.

2. The BMS activation circuit according to claim 1, characterized in that: The protection circuit also includes an overvoltage protection circuit; The overvoltage protection circuit is connected to the output end of the rectifier circuit, and the overvoltage protection circuit includes a driving voltage discharge path, which is arranged between the undervoltage protection circuit and the activation switch, and the driving voltage discharge path is used to be turned on when the voltage output by the rectifier circuit is greater than a second voltage threshold, so as to discharge the driving voltage through the driving voltage discharge path; The second voltage threshold is an upper threshold of the target voltage range.

3. The BMS activation circuit according to claim 1 or 2, characterized in that: The undervoltage protection circuit also includes a first voltage regulator and a third energy storage circuit; The first electrode and the second electrode of the undervoltage protection switch are arranged on the energy storage path; the first electrode, the control electrode, the first voltage regulator tube and the third energy storage circuit of the undervoltage protection switch are arranged on the first breakdown path in the undervoltage protection circuit, and the two ends of the first breakdown path are respectively connected to the two ends of the first energy storage circuit; Wherein, when the output voltage of the first energy storage circuit meets the conduction condition, the first voltage regulator is broken down, and the undervoltage protection switch is turned on; The third energy storage circuit is used to charge using the voltage output by the rectifier circuit when the undervoltage protection switch is turned on.

4. The BMS activation circuit according to claim 3, characterized in that: The conduction condition includes: the output voltage of the first energy storage circuit is greater than the sum of the breakdown voltage of the first voltage regulator and the control electrode voltage of the undervoltage protection switch, and the third energy storage circuit is in a non-fully charged state.

5. The BMS activation circuit according to claim 4, characterized in that: When the third energy storage circuit is in a fully charged state, the undervoltage protection switch is turned off.

6. The BMS activation circuit according to claim 3, characterized in that: The undervoltage protection circuit also includes an energy storage discharge path; The third energy storage circuit is used to discharge the electric energy through the energy storage discharge path after the AC power supply is disconnected from output.

7. The BMS activation circuit according to claim 2, characterized in that: Two ends of the driving voltage discharge path in the overvoltage protection circuit are respectively connected to two ends of the second energy storage circuit; a discharge switch is provided on the driving voltage discharge path; The discharge switch is used to be turned on when the voltage output by the rectifier circuit is greater than the second voltage threshold.

8. The BMS activation circuit according to claim 7, characterized in that: The overvoltage protection circuit also includes a second voltage regulator tube and a fourth energy storage circuit; The first electrode and the second electrode of the discharge switch are arranged on the driving voltage discharge path; The control electrode of the discharge switch, the second voltage regulator tube and the fourth energy storage circuit are arranged on a second breakdown path in the overvoltage protection circuit, and both ends of the second breakdown path are connected to the output end of the rectifier circuit; When the voltage output by the rectifier circuit is greater than the second voltage threshold, the second voltage regulator tube is broken down and the discharge switch is turned on.

9. The BMS activation circuit according to claim 1 or 2, characterized in that: The activation switch is an electrical isolation device.

10. An energy storage device, characterized in that: The energy storage device comprises: a BMS, a battery and a BMS activation circuit as claimed in any one of claims 1 to 9; Wherein, the BMS is connected to the BMS activation circuit and the battery respectively.

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