Load access identification circuit and energy storage device

Abstract

The present application relates to a load access identification circuit and an energy storage device. The load access identification circuit includes: a signal receiving module and an activation and detection module; the activation and detection module are respectively connected to the signal receiving module, the power supply and the battery management system, and the signal receiving module is also connected to the power supply; the signal receiving module is used to output an electrical signal when an activation trigger signal is received; the activation and detection module is used to output an activation signal to the activation end of the battery management system based on the power supply voltage of the power supply at the first moment after receiving the electrical signal, and output a detection signal to the detection end of the battery management system at the second moment after receiving the electrical signal; the second moment is later than the first moment, and the detection signal is used to characterize the type of the activation trigger signal. The use of this load access identification circuit can realize automatic activation of the battery management system when the load is connected, and accurately identify whether the connected load is online.

Description

Technical Field

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

[0002] With the rapid development and widespread application of energy storage product technology, users have put forward higher requirements for its intelligence level, especially for the activation method of energy storage products.

[0003] Although existing energy storage products can activate the battery management system to provide power based on activation methods such as button triggering, they are unable to automatically activate the battery management system when a load is connected and accurately identify whether the connected load is online, thus affecting subsequent power supply. Summary of the invention

[0004] Based on this, it is necessary to provide a load access identification circuit and an energy storage device.

[0005] In a first aspect, the present application provides a load access identification circuit, the load access identification circuit comprising: a signal receiving module and an activation and detection module;

[0006] The activation and detection modules are respectively connected to the signal receiving module, the power supply and the battery management system, and the signal receiving module is also connected to the power supply;

[0007] The signal receiving module is used to output an electrical signal when receiving an activation trigger signal;

[0008] The activation and detection module is used to output an activation signal to the activation end of the battery management system based on the power supply voltage of the power supply at the first moment after receiving the electrical signal, and to output a detection signal to the detection end of the battery management system at the second moment after receiving the electrical signal; the second moment is later than the first moment, and the detection signal is used to characterize the type of the activation trigger signal.

[0009] In one of the embodiments, the battery management system outputs a driving signal via an enable terminal of the battery management system when receiving an activation signal; the activation and detection module is further configured to continuously output the activation signal when receiving the driving signal.

[0010] In one of the embodiments, the activation and detection module includes: a charge and discharge time window unit, a driving unit and a detection unit;

[0011] The charge and discharge time window unit is respectively connected to the signal receiving module, the driving unit and the detection unit. The driving unit is also used to connect to the power supply and the battery management system. The detection unit is also used to connect to the battery management system.

[0012] The charge and discharge time window unit is used to trigger the driving unit to output an activation signal to the activation end of the battery management system at the first moment after charging starts based on the electrical signal, and to trigger the detection unit to output a detection signal to the detection end of the battery management system at the second moment after charging starts based on the electrical signal.

[0013] In one embodiment, the driving unit includes: a voltage stabilizing diode ZD1 and a first switch unit; the cathode of the voltage stabilizing diode ZD1 is connected to the charge and discharge time window unit, the anode of the voltage stabilizing diode ZD1 is connected to the controlled end of the first switch unit, the controlled end of the first switch unit is also used to connect to the battery management system, the input end of the first switch unit is used to connect to the power supply, and the output end of the first switch unit is used to connect to the battery management system;

[0014] The detection unit includes: a voltage stabilizing diode ZD2 and a second switch unit; the cathode of the voltage stabilizing diode ZD2 is connected to the charge and discharge time window unit, the anode of the voltage stabilizing diode ZD1 is connected to the controlled end of the second switch unit, the input end of the first switch unit is used to connect to a preset voltage, and the output end of the first switch unit is used to connect to a battery management system;

[0015] The reverse breakdown voltage of the Zener diode ZD2 is greater than the reverse breakdown voltage of the Zener diode ZD1.

[0016] In one embodiment, the first switch unit includes: a resistor R5, a switch tube Q4, a switch tube Q3 and a resistor R6; the resistor R5 is connected in series between the anode of the voltage stabilizing diode ZD1 and the base of the switch tube Q4, the resistor R6 is connected in series between the collector of the switch tube Q4 and the base of the switch tube Q3, the emitter of the switch tube Q3 is used to connect to the power supply, the collector of the switch tube Q3 is used to connect to the battery management system, and the emitter of the switch tube Q4 is grounded;

[0017] The second switch unit includes: a resistor R8, a switch tube Q5 and a resistor R9; the resistor R8 is connected in series between the anode of the voltage-stabilizing diode ZD2 and the ground terminal, the base of the switch tube Q5 is connected to the anode of the voltage-stabilizing diode ZD2, the emitter of the switch tube Q5 is grounded, the first end of the resistor R9 is used to access a preset voltage, and the second end of the resistor R9 is respectively connected to the collector of the switch tube Q5 and the battery management system.

[0018] In one embodiment, the driving unit further includes: a diode D3 and a diode D2;

[0019] The anode of the diode D3 is connected to the anode of the voltage stabilizing diode ZD1, the cathode of the diode D3 is connected to the controlled end of the first switch unit, the anode of the diode D2 is connected to the battery management system, and the cathode of the diode D2 is connected to the controlled end of the first switch unit.

[0020] In one embodiment, the detection unit further includes: a resistor R7 and a capacitor C4;

[0021] The resistor R7 is connected in series between the charging and discharging time window unit and the cathode of the voltage zener diode ZD2, and the capacitor C4 is connected in series between the anode of the voltage zener diode ZD2 and the ground terminal.

[0022] In one embodiment, the charge and discharge time window unit includes: a switch tube Q2, a capacitor C3, a resistor R4, a resistor R3, a capacitor C2, a diode D1 and a resistor R2;

[0023] The emitter of the switch tube Q2 is connected to the signal receiving module, the collector of the switch tube Q2 is connected to the first end of the capacitor C3, the resistor R3 and the capacitor C2 are connected in series between the base of the switch tube Q2 and the ground terminal, the first end of the capacitor C3 is also connected to the first end of the resistor R4, the first end of the resistor R4 is also respectively connected to the driving unit and the detection unit, the second end of the capacitor C3 and the second end of the resistor R4 are both grounded, the anode of the diode D1 is connected between the resistor R3 and the capacitor C2, the cathode of the diode is respectively connected to the first end of the resistor R2 and the signal receiving module, and the second end of the resistor R2 is grounded.

[0024] In one embodiment, the signal receiving module includes: a switch tube Q1, a switch SW1, a capacitor C1 and a resistor R1;

[0025] The emitter of the switch tube Q1 is used to connect to the power supply, the collector of the switch tube is connected to the activation and detection module, the resistor R1 and the switch SW1 are connected in series between the base of the switch tube Q1 and the ground terminal, the first end of the capacitor C1 is used to connect to the power supply, and the second end of the capacitor C1 is connected between the resistor R1 and the switch SW1.

[0026] In a second aspect, the present application also provides an energy storage device, including:

[0027] Power supply;

[0028] Battery management system;

[0029] And the load access identification circuit as in the above embodiment.

[0030] The above-mentioned load access identification circuit and energy storage device have at least the following beneficial effects:

[0031] Based on the settings of the signal receiving module and the activation and detection module, by distinguishing the time sequence of the activation signal and the detection signal, it is possible to ensure that the battery management system is fully started and ready to receive data, so that when the energy storage device detects that a load is connected to its DC output port, it can quickly activate the battery management system and then perform load detection, start working and confirm the load status in the shortest time, which can not only improve the detection accuracy and avoid data misreading or control errors caused by the system not being ready, but also take corresponding power supply control measures in time when it is confirmed that the load is online. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] 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.

[0033] Figure 1 It is one of the structural schematic diagrams of a load access identification circuit in one embodiment;

[0034] Figure 2 This is a second structural diagram of a load access identification circuit in an embodiment;

[0035] Figure 3 The third structural diagram of a load access identification circuit in one embodiment;

[0036] Figure 4 This is a fourth structural diagram of a load access identification circuit in one embodiment;

[0037] Figure 5 This is a fifth structural diagram of a load access identification circuit in one embodiment;

[0038] Figure 6 This is a sixth structural diagram of a load access identification circuit in one embodiment;

[0039] Figure 7 FIG. 7 is a structural schematic diagram of a load access identification circuit in an embodiment. DETAILED DESCRIPTION

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] It can be understood that “at least one” means one or more, “plurality” means two or more, and “at least a portion of an element” means a part or all of an element.

[0045] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" and the like specify the presence of stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. At the same time, the term "and / or" used in this specification includes any and all combinations of the relevant listed items.

[0046] In an exemplary embodiment, Figure 1 As shown, the present application provides a load access identification circuit, including a signal receiving module 2 and an activation and detection module 4. The activation and detection module 4 is respectively connected to the signal receiving module 2, the power supply 300 and the battery management system 500, and the signal receiving module 2 is also connected to the power supply 300; the signal receiving module 2 is used to output an electrical signal when an activation trigger signal is received; the activation and detection module 4 is used to output an activation signal to the activation end of the battery management system 500 based on the power supply voltage of the power supply 300 at the first moment after receiving the electrical signal, and output a detection signal to the detection end of the battery management system 500 at the second moment after receiving the electrical signal; the second moment is later than the first moment, and the detection signal is used to characterize the type of the activation trigger signal.

[0047] Among them, the activation trigger signal may refer to a signal generated when a load is connected to the DC output port of the energy storage device through a connecting line, a converter, etc.; for example, by setting a sensing module at the DC output port of the energy storage device, when a load is connected through a connecting line, a converter, etc., the sensing module may generate an activation trigger signal.

[0048] Exemplarily, after receiving the activation trigger signal, the signal receiving module 2 outputs an electrical signal to the activation and detection module 4 under the action of the power supply voltage of the power supply 300. After receiving the above-mentioned electrical signal, the activation and detection module 4 first outputs an activation signal to the battery management system 500 at a first moment based on the power supply voltage of the power supply 300, so that the battery management system 500 is activated first, and then at a second moment later than the first moment, based on the action of the electrical signal, outputs a detection signal to the battery management system 500, so that the battery management system 500 activated first can be in a working state first, and can detect the detection signal output later, so as to confirm whether there is a load connected to the DC output port of the energy storage device through a connecting line, a converter, etc., that is, to confirm whether the load is online, so as to realize subsequent power supply control.

[0049] The load access identification circuit, based on the settings of the signal receiving module and the activation and detection module, can ensure that the battery management system is fully started and ready to receive data by distinguishing the time sequence of the activation signal and the detection signal, so that when the energy storage device detects that a load is connected to its DC output port, it can quickly activate the battery management system and then perform load detection, start working and confirm the load status in the shortest time, which can not only improve the detection accuracy and avoid data misreading or control errors caused by the system not being ready, but also take corresponding power supply control measures in time when it is confirmed that the load is online.

[0050] In an exemplary embodiment, the power supply 300 may be a power supply provided by a power supply in an energy storage device. For another example, the power supply 300 may be another power supply other than the power supply.

[0051] In an exemplary embodiment, Figure 2 As shown, the battery management system 500 outputs a driving signal via the enable terminal of the battery management system 500 when receiving the activation signal; the activation and detection module 4 is also used to continuously output the activation signal when receiving the driving signal.

[0052] Exemplarily, after the battery management system 500 completes activation, the battery management system 500 can output a driving signal to the activation and detection module 4. Even if the electrical signal output by the signal receiving module 2 disappears, the activation and detection module 4 can continue to output an activation signal to the battery management system 500 based on the power supply voltage of the power supply 300 after receiving the driving signal, so as to ensure that the battery management system 500 is in a stable activation state, so as to realize subsequent power supply monitoring or control. That is to say, after the battery management system 500 completes activation, the battery management system 500 can take over the subsequent activation control by itself, without being limited to the control of the electrical signal output by the signal receiving module 2. For example, even if the electrical signal output by the signal receiving module 2 disappears, but the load is always in the connected state, the battery management system 500 can be combined with the power detection circuit to determine whether to continue to enable the DC module circuit. For example, if the device connected to the USB-A port is fully charged and the DC module circuit has no output power, the battery management system 500 can choose to shut down and power off to minimize the power consumption of the energy storage device itself.

[0053] In this embodiment, the battery management system can independently maintain its activation state after initial activation and is not affected by changes in front-end signals, thereby ensuring the continuity and reliability of system operation and maintaining stable power supply management and monitoring functions even when external conditions change.

[0054] In an exemplary embodiment, Figure 3 As shown, the activation and detection module 4 includes a charge and discharge time window unit 42, a drive unit 44 and a detection unit 46. The charge and discharge time window unit 42 is connected to the signal receiving module 2, the drive unit 44 and the detection unit 46 respectively, the drive unit 44 is also used to connect to the power supply 300 and the battery management system 500, and the detection unit 46 is also used to connect to the battery management system 500; the charge and discharge time window unit 42 is used to trigger the drive unit 44 to output an activation signal to the activation end of the battery management system 500 at the first moment after charging starts based on the electrical signal, and trigger the detection unit 46 to output a detection signal to the detection end of the battery management system 500 at the second moment after charging starts based on the electrical signal.

[0055] Exemplarily, after receiving the activation trigger signal, the signal receiving module 2 outputs an electrical signal to the charging time window unit. After receiving the electrical signal, the charging time window unit starts continuous charging and timing. At the first moment after starting charging, based on the connection with the driving unit 44, the driving unit 44 is triggered to output an activation signal to the activation end of the battery management system 500 to activate the battery management system 500. At the second moment after starting charging, based on the connection with the detection unit 46, the detection unit 46 is triggered to output a detection signal to the battery management system 500, so that the battery management system 500, which is already in an activated state at the first moment, can receive and detect the detection signal output by the detection unit 46, thereby confirming whether there is a load connected to the DC output port of the energy storage device through a connecting line, a converter, etc., that is, confirming whether the load is online, so as to realize subsequent power supply control.

[0056] Among them, the driving unit 44 is also used to connect to the battery management system 500. After the battery management system 500 completes activation, the battery management system 500 can output a driving signal to the driving unit 44. Even if the signal output by the charging time window unit disappears, the driving unit 44 can continue to output an activation signal to the battery management system 500 based on the power supply voltage of the power supply 300 after receiving the driving signal, so as to ensure that the battery management system 500 is in a stable activation state.

[0057] In this embodiment, the charging timing method of the charge and discharge time window unit is used to accurately control the time sequence of activation and detection, ensuring that the battery management system can receive the activation signal and the detection signal in sequence according to the preset time intervals, so that the battery management system can respond quickly and accurately detect the load status when the load is connected, thereby optimizing the power supply control process.

[0058] In an exemplary embodiment, Figure 4 As shown, the driving unit 44 includes: a Zener diode ZD1 and a first switch unit 442; the cathode of the Zener diode ZD1 is connected to the charge and discharge time window unit 42, the anode of the Zener diode ZD1 is connected to the controlled end of the first switch unit 442, the controlled end of the first switch unit 442 is also used to connect to the battery management system 500, the input end of the first switch unit 442 is used to connect to the power supply 300, and the output end of the first switch unit 442 is used to connect to the battery management system 500; the detection unit 46 includes: a Zener diode ZD2 and a second switch unit 462; the cathode of the Zener diode ZD2 is connected to the charge and discharge time window unit 42, the anode of the Zener diode ZD1 is connected to the controlled end of the second switch unit 462, the input end of the first switch unit 442 is used to connect to a preset voltage, and the output end of the first switch unit 442 is used to connect to the battery management system 500; the reverse breakdown voltage of the Zener diode ZD2 is greater than the reverse breakdown voltage of the Zener diode ZD1.

[0059] Exemplarily, at the first moment after the charge and discharge time window unit 42 starts charging based on the electrical signal, the voltage output by the charging time window unit is greater than the reverse breakdown voltage of the Zener diode ZD1, and the Zener diode ZD1 is turned on. The voltage output by the charging time window unit at the first moment is output to the controlled end of the first switch unit 442 via the Zener diode ZD1. The first switch unit 442 is turned on after receiving the voltage output by the charging time window unit at the first moment, so that the current provided by the power supply voltage of the power supply 300 is input to the battery management system 500 through the input end and the output end of the first switch unit 442 (i.e., an activation signal is output to the battery management system 500), so that the battery management system 500 is electrically activated. At the second moment after the charge and discharge time window unit 42 starts charging based on the electrical signal, the voltage output by the charging time window unit is greater than the reverse breakdown voltage of the voltage stabilizing diode ZD2, and the voltage stabilizing diode ZD2 is turned on. The voltage output by the charging time window unit at the second moment is output to the controlled end of the second switch unit 462 via the voltage stabilizing diode ZD2. The second switch unit 462 is turned on after receiving the voltage output by the charging time window unit at the second moment, so that the current provided by the preset voltage is input to the battery management system 500 through the input end and the output end of the second switch unit 462 (i.e., the detection signal is output to the battery management system 500). By setting the reverse breakdown voltage of the voltage stabilizing diode ZD2 to be greater than the reverse breakdown voltage of the voltage stabilizing diode ZD1, the first switch unit 442 and the second switch unit 462 are turned on at different moments, thereby realizing that the battery management system 500 is activated first and then detected.

[0060] Among them, the controlled end of the first switch unit 442 is also used to connect the battery management system 500. After the battery management system 500 completes activation, the battery management system 500 can output a driving signal to the controlled end of the first switch unit 442. Even if the signal output by the charging time window unit disappears or the voltage output by the charging time window unit at the first moment is less than the reverse breakdown voltage of the Zener diode ZD1, the first switch unit 442 can continue to output an activation signal to activate the battery management system 500 based on the power supply voltage of the power supply 300 after receiving the driving signal, so as to ensure that the battery management system 500 is in a stable activation state.

[0061] In this embodiment, by using Zener diodes with different reverse breakdown voltages and combining the characteristic that the output voltage of the charge and discharge time window unit gradually increases with the passage of time, the Zener diode ZD1 and the Zener diode ZD2 are broken down successively at different times to control the time sequence of activation and detection, thereby ensuring that the battery management system can be activated first and then detected, which not only achieves precise time control and avoids signal conflicts, but also improves the accuracy of signal detection.

[0062] In an exemplary embodiment, Figure 4 As shown, the first switch unit 442 includes: a resistor R5, a switch tube Q4, a switch tube Q3 and a resistor R6; the resistor R5 is connected in series between the anode of the voltage-stabilizing diode ZD1 and the base of the switch tube Q4, the resistor R6 is connected in series between the collector of the switch tube Q4 and the base of the switch tube Q3, the emitter of the switch tube Q3 is used to connect to the power supply 300, the collector of the switch tube Q3 is used to connect to the battery management system 500, and the emitter of the switch tube Q4 is grounded; the second switch unit 462 includes: a resistor R8, a switch tube Q5 and a resistor R9; the resistor R8 is connected in series between the anode of the voltage-stabilizing diode ZD2 and the ground terminal, the base of the switch tube Q5 is connected to the anode of the voltage-stabilizing diode ZD2, the emitter of the switch tube Q5 is grounded, the first end of the resistor R9 is used to access the preset voltage, and the second end of the resistor R9 is respectively connected to the collector of the switch tube Q5 and the battery management system 500.

[0063] The switch tubes Q4 and Q5 may be NPN transistors, and the switch tube Q3 may be a PNP transistor.

[0064] Exemplarily, when the voltage-stabilizing diode ZD1 is in the on state, the voltage output by the charge and discharge time window unit 42 at the first moment is applied to the base of the switch tube Q4 through the resistor R5, the potential of the base of the switch Q4 is pulled high, the switch tube Q4 is turned on, the potential of the base of the switch tube Q3 is pulled to the ground, and under the action of the power supply voltage of the power supply 300, the switch tube Q3 is turned on, and the current provided by the power supply voltage of the power supply 300 passes through the emitter and collector of the switch tube Q3 and is input to the battery management system 500 (i.e., an activation signal is output to the battery management system 500), so that the battery management system 500 is electrically activated. When the voltage-stabilizing diode ZD2 is in the on state, the voltage output by the charge and discharge time window unit 42 at the second moment is applied to the base of the switch tube Q5, the potential of the base of the switch tube Q5 is pulled up, the switch tube Q5 is turned on, and the current provided by the preset voltage flows to the ground terminal through the resistor R9 and the collector and emitter of the switch tube Q5. The loop formed by the resistor R9 and the switch tube Q5 is turned on, and the current provided by the preset voltage is simultaneously input to the battery management system 500 through the resistor R9 (that is, the detection signal is output to the battery management system 500).

[0065] Among them, one end of the resistor R5 is also used to connect the battery management system 500. After the battery management system 500 is activated, the battery management system 500 can output a driving signal and input it to the base of the switch tube Q4 through the resistor R5. Even if the signal output by the charging time window unit disappears or the voltage output by the charging time window unit at the first moment is less than the reverse breakdown voltage of the Zener diode ZD1, the switch tube Q4 can still be turned on after receiving the driving signal, so that the switch tube Q3 is turned on and based on the power supply voltage of the power supply 300, it continues to output an activation signal to the battery management system 500 to ensure that the battery management system 500 is in a stable activation state.

[0066] In this embodiment, by using Zener diodes with different reverse breakdown voltages in conjunction with switch tubes, orderly activation and detection of the battery management system is achieved, ensuring rapid response and stable operation when a load is connected.

[0067] In an exemplary embodiment, Figure 4 As shown, the driving unit 44 further includes a diode D3 and a diode D2. The anode of the diode D3 is connected to the anode of the voltage-stabilizing diode ZD1, the cathode of the diode D3 is connected to the controlled end of the first switch unit 442, the anode of the diode D2 is connected to the battery management system 500, and the cathode of the diode D2 is connected to the controlled end of the first switch unit 442.

[0068] For example, by adding a diode D2, the voltage output by the charge and discharge time window unit 42 can be prevented from being injected into the battery management system 500, causing damage to the electronic components in the battery management system 500. The addition of a diode D3 can prevent the drive signal output by the battery management system 500 from flowing to the charge and discharge time window unit 42 through the voltage regulator diode ZD1, thereby avoiding affecting the output of the detection signal.

[0069] In this embodiment, by adding diodes D2 and D3, the battery management system is effectively protected from damage by reverse voltage, and it is ensured that the driving signal output by the battery management system will not interfere with the operation of the charge and discharge time window unit, thereby ensuring the accurate output of the detection signal.

[0070] In an exemplary embodiment, Figure 4 As shown, the detection unit 46 also includes a resistor R7 and a capacitor C4. The resistor R7 is connected in series between the charge and discharge time window unit 42 and the cathode of the voltage zener diode ZD2, and the capacitor C4 is connected in series between the anode of the voltage zener diode ZD2 and the ground.

[0071] In this embodiment, setting the resistor R7 and the capacitor C4 helps to smooth the voltage output by the charge and discharge time window unit. The resistor R7 limits the current to prevent the instantaneous large current from impacting the Zener diode ZD2, while the capacitor C4 can filter out the high-frequency noise in the voltage to ensure that the Zener diode ZD2 reaches a breakdown state under stable conditions, thereby improving the stability and reliability of the detection signal output.

[0072] In an exemplary embodiment, Figure 5 As shown, the charge and discharge time window unit 42 includes: a switch tube Q2, a capacitor C3, a resistor R4, a resistor R3, a capacitor C2, a diode D1 and a resistor R2. The emitter of the switch tube Q2 is connected to the signal receiving module 2, the collector of the switch tube Q2 is connected to the first end of the capacitor C3, the resistor R3 and the capacitor C2 are connected in series between the base of the switch tube Q2 and the ground terminal, the first end of the capacitor C3 is also connected to the first end of the resistor R4, the first end of the resistor R4 is also connected to the driving unit 44 and the detection unit 46 respectively, the second end of the capacitor C3 and the second end of the resistor R4 are both grounded, the anode of the diode D1 is connected between the resistor R3 and the capacitor C2, the cathode of the diode is respectively connected to the first end of the resistor R2 and the signal receiving module 2, and the second end of the resistor R2 is grounded.

[0073] The switch tube Q2 may be a PNP transistor.

[0074] Exemplarily, when the signal receiving module 2 receives the activation trigger signal, it outputs an electrical signal to the emitter of the switch tube Q2, the switch tube Q2 is turned on, and the capacitor C3 starts to charge under the action of the electrical signal. At the first moment after the charging starts, the voltage BAT+0 of the capacitor C3 reaches the voltage threshold that triggers the drive unit 44 to output the activation signal. Based on the connection between the capacitor C3 and the drive unit 44, under the action of the voltage BAT+0 of the capacitor C3, the drive unit 44 outputs the activation signal to the battery management system 500 to activate the battery management system 500 at the first moment; and after the charging starts At the second moment, the voltage BAT+0 of the capacitor C3 reaches the voltage threshold for triggering the detection unit 46 to output an activation signal. Based on the connection between the capacitor C3 and the detection unit 46, under the action of the voltage BAT+0 of the capacitor C3, the detection unit 46 outputs a detection signal to the battery management system 500, so that the battery management system 500, which is already in an activated state at the first moment, can receive and detect the detection signal output by the detection unit 46, thereby confirming whether there is a load connected to the DC output port of the energy storage device through a connecting line, a converter, etc., that is, confirming whether the load is online, so as to realize subsequent power supply control.

[0075] When the switch tube Q2 receives the electrical signal output by the signal receiving module 2 and is turned on, it not only charges the capacitor C3, but also charges the capacitor C2 through the resistor R3. After the capacitor C2 is fully charged, the switch tube Q2 is turned off. In this way, regardless of whether the signal receiving module 2 receives the activation trigger signal (i.e., regardless of whether the load is connected to the DC output port of the energy storage device through a connecting line, an adapter, etc.), the subsequent circuit (such as the drive unit 44 or the detection unit 46) is in a non-working state, achieving zero loss. Moreover, after the switch tube Q2 is turned off, the capacitor C3 can be discharged through the resistor R4, and the voltage of the capacitor C3 gradually decreases and cannot reach the voltage threshold for triggering the drive unit 44 to output the activation signal. In this way, regardless of whether the signal receiving module 2 receives the activation trigger signal (i.e., regardless of whether the load is connected to the DC output port of the energy storage device through a connecting line, an adapter, etc.), the output of the activation signal in the drive unit 44 is no longer controlled, so that the battery management system 500 can be powered off and shut down freely. By configuring the parameters of the capacitor C2 and the resistor R3, the charging time constant of the capacitor C2 can be adjusted, thereby obtaining a desired time window length to control the charging time of the capacitor C3.

[0076] The charge and discharge time window unit 42 further includes a reset circuit composed of a diode D1 and a resistor R2, so that after the load is disconnected from the DC output port of the energy storage device, the signal receiving module 2 stops outputting the electrical signal, and at this time, the capacitor C2 can be discharged by the resistor R2 through the diode D1, so that when the load is connected to the DC output port of the energy storage device next time, the capacitor C3 can be charged again under the action of the electrical signal output by the signal receiving module 2, thereby re-triggering the drive unit 44 to output the activation signal and the triggering detection unit 46 to output the detection signal. By configuring the parameters of the capacitor C2 and the resistor R2, the discharge time constant of the capacitor C2 can be adjusted to set the reset time after the load is unplugged from the DC output port of the energy storage device.

[0077] In this embodiment, the charging and discharging characteristics of capacitor C3 are used to determine the timing of activation and detection, ensuring that the battery management system can be activated and detected in an orderly manner and automatically shut down when necessary. Through resistor R3 and capacitor C2, the subsequent circuit is put into a low-power non-working state under no-load conditions, and the battery management system can be quickly powered off and shut down after the load is removed, reducing unnecessary energy consumption. In addition, through the reset circuit composed of diode D1 and resistor R2, capacitor C2 can be quickly reset after the load is disconnected, ensuring that the system can be accurately restarted when the load is connected next time, and by adjusting the parameters of capacitor C2 and resistor R2, the reset time can be flexibly controlled, thereby improving the response speed and reliability of the system.

[0078] In an exemplary embodiment, Figure 6As shown, the signal receiving module 2 includes a switch tube Q1, a switch SW1, a capacitor C1 and a resistor R1. The emitter of the switch tube Q1 is used to connect to the power supply 300, the collector of the switch tube is connected to the activation and detection module 4, the resistor R1 and the switch SW1 are connected in series between the base of the switch tube Q1 and the ground terminal, the first end of the capacitor C1 is used to connect to the power supply 300, and the second end of the capacitor C1 is connected between the resistor R1 and the switch SW1.

[0079] The switch tube Q1 may be a PNP transistor.

[0080] Exemplarily, the DC output ports of the energy storage device include a USB-A port, a USB-C port, a cigarette lighter port, a 5521 interface, and a 7909 interface, etc. Taking the USB-A port as an example, when there is no load connected to the USB-A port through a connecting line, a converter, etc., the sensing module arranged at the USB-A port has no activation trigger signal generated, and the switch SW1 is in a disconnected state. When there is a load connected to the USB-A port through a connecting line, a converter, etc., the sensing module arranged at the USB-A port generates an activation trigger signal, the switch SW1 is short-circuited, and the current provided by the power supply voltage BAT+ of the power supply 300 flows through the base of the switch tube Q1, the resistor R1, and the switch SW1, and the switch tube Q1 is turned on, thereby outputting an electrical signal to the activation and detection module 4, so that after receiving the electrical signal, the activation and detection module 4 outputs an activation signal and a detection signal to the battery management system 500.

[0081] In this embodiment, by integrating the switch SW1 and related components in the signal receiving module, the load connection can be accurately detected, and the electrical signal can be quickly output to activate the battery management system, ensuring the timeliness and accuracy of the system's response to the load.

[0082] In order to describe the technical solution of the present application in more detail, Figure 7 Describe it in detail. Figure 7 As shown, the load connection identification circuit of the present application includes a signal receiving module 2 and an activation and detection module 4. The activation and detection module 4 includes a charge and discharge time window unit 42, a driving unit 44 and a detection unit 46.

[0083] The DC port of the energy storage device generally includes various types of ports, such as USB-A port, USB-C port, cigarette lighter port, 5521 port, 7909 port, etc. Taking the USB-A port as an example, when there is no load connected to the USB-A port through a connecting line, a converter, etc., the sensing module set at the USB-A port has no activation trigger signal, and the switch SW1 is in a disconnected state; when a connecting line, a converter, etc. is connected to the USB-A port, the sensing module set at the USB-A port generates an activation trigger signal, the switch SW1 is short-circuited, and the current provided by the power supply voltage BAT+ of the power supply 300 flows through the base of the PNP transistor Q1, the resistor R1 and the switch SW1, and the PNP transistor Q1 is turned on; the power supply voltage BAT+ of the power supply 300 charges the capacitor C2 through the emitter and collector of the PNP transistor Q1, the base of the PNP transistor Q2 and the resistor R3, and a current loop is formed during the charging process. The PNP transistor Q2 is turned on, and the power supply voltage BAT+ of the power supply 300 charges the capacitor C3 through the emitter and collector of the PNP transistor Q1, and the emitter and collector of the PNP transistor Q2, and the voltage across the capacitor C3 gradually rises.

[0084] Among them, a Zener diode ZD1 is designed in the driving unit 44, and a Zener diode ZD2 is designed in the detection unit 46. When selecting, the reverse breakdown voltage value of the Zener diode ZD1 should be lower than the reverse breakdown voltage value of the Zener diode ZD2. When the voltage across the capacitor C3 gradually rises, the Zener diode ZD1 is broken down first, and the voltage across the capacitor C3 flows through the base of the NPN transistor Q4 through the Zener diode ZD1, the diode D3, and the resistor R5. The NPN transistor Q4 is turned on, and the current provided by the power supply voltage BAT+ of the power supply 300 flows through the base of the PNP transistor Q3 and the resistor R6 through the collector and emitter of the NPN transistor Q4. The PNP transistor Q3 is turned on, AUX_VCC is powered, the battery management system 500 is powered on and starts working, and the energy storage device is activated. After the battery management system 500 is powered on and started, it can preferentially send out a driving signal PW_EN (high level valid), which is input to the base of the NPN transistor Q4 through the diode D2 and the resistor R5 to maintain the conduction of the NPN transistor Q4 and ensure that the battery management system 500 continues to work normally.

[0085] By designing a Zener diode ZD1 in the driving unit 44 and a Zener diode ZD2 in the detection unit 46, the reverse breakdown voltage value of the Zener diode ZD1 should be lower than the reverse breakdown voltage value of the Zener diode ZD2 during selection, so that the driving unit 44 and the detection unit 46 have a logical sequence in timing. When the load is connected through a connecting line, a converter, etc., the PNP transistor Q3 in the driving unit 44 will be turned on first, and the PNP transistor Q3 is turned on, and the battery management system 500 is powered on to start working; when selecting the Zener diode, the breakdown voltage value of the Zener diode ZD2 is higher than the breakdown voltage value of the Zener diode ZD1. While the voltage BAT+0 across the capacitor C3 continues to rise, the voltage BAT+0 across the capacitor C3 is charged to the capacitor C4 in the detection unit 46 through the resistor R7. Therefore, the breakdown of the Zener diode ZD2 lags behind the breakdown time of the Zener diode ZD1, so that when the load is connected through a connecting line, a converter, etc., the battery management system 500 is activated first, and then the detection signal (DC_EN signal) is output, so that the battery management system 500 can correctly determine whether the DC output interface of the energy storage device is loaded online based on the detection signal.

[0086] As the power supply voltage BAT+ of the power supply 300 charges the capacitor C3 through the emitter and collector of the PNP transistor Q1 and the emitter and collector of the PNP transistor Q2, the voltage BAT+0 across the capacitor C3 continues to rise, while the voltage BAT+0 across the capacitor C3 charges the capacitor C4 through the resistor R7. When the voltage across the capacitor C4 reaches the breakdown voltage of the Zener diode ZD2, the Zener diode ZD2 is broken down, and the current provided by the voltage BAT+0 across the capacitor C3 flows through the resistor R7 and the Zener diode ZD2 and the base of the NPN transistor Q5. The NPN transistor Q5 is turned on, and the detection The detection signal (DC_EN signal) is pulled down to a low level. The I / O port of the MCU in the battery management system 500 can be configured to detect that when the detection signal (DC_EN signal) is pulled down to a low level, it is determined that there is a load online at one of the DC output ports of the energy storage device, and the DC module circuit is enabled, and the DC output port outputs the designed voltage value; the MCU in the battery management system 500 is designed to detect the detection signal (DC_EN signal) and can reliably determine that the battery management system 500 is activated by the load connected through a connecting line, a converter, etc.; otherwise, it is determined to be a battery management system 500 activated by other means.

[0087] At the same time, when the voltage BAT+0 across the capacitor C3 is zero, the driving signal (PW_EN signal) issued by the battery management system 500 maintains the conduction of the NPN transistor Q4. Even if the load is connected, the energy storage device can combine the power detection circuit output by the DC module circuit to determine whether to continue to enable the DC module circuit. For example, if the load connected to the USB-A port is fully charged and the DC module circuit has no output power, the battery management system 500 can choose to shut down and power off to minimize the power consumption of the energy storage device itself.

[0088] It should be noted that setting the detection unit 46 at the rear stage of the driving unit 44 can further reduce the power consumption of the energy storage device. When a load is connected to the DC output port of the energy storage device through a connecting line, a converter, etc., the capacitor C3 is charged; when the capacitor C2 is finally fully charged, the PNP transistor Q2 is cut off, and the rear-stage circuit of the transistor Q2 is in a non-working state, that is, zero loss, regardless of whether the load is connected through a connecting line, a converter, etc.; at the same time, after the DC output port is connected with a load through a connecting line, a converter, etc., the voltage BAT+0 across the capacitor C3 is discharged to 0V by the resistor R4, regardless of whether the load is connected, It no longer affects the conduction state of the NPN transistor Q4, so that the energy storage device can be freely shut down and powered off.

[0089] The charge and discharge time window unit 42 is designed with a reset function composed of a diode D1 and a resistor R2. When the connecting wire, converter, etc. are unplugged, the activation trigger signal disappears, the switch SW1 is disconnected, the PNP transistor Q1 is disconnected, and the voltage across the capacitor C2 is discharged by the resistor R2 through the diode D1. By configuring the parameters of the capacitor C2 and the resistor R3, the charging time constant of the capacitor C2 can be adjusted to obtain the desired time window length; by configuring the parameters of the capacitor C2 and the resistor R2, the discharge time constant of the capacitor C2 can be adjusted to set the reset time after the connecting wire, converter, etc. are unplugged.

[0090] Among them, the load access identification circuit of the present application is further explained as follows: resistor R1 is a current limiting resistor, which can limit the current flowing through the base of the PNP transistor Q1; capacitor C1 is a filter capacitor, which can prevent the PNP transistor Q1 from being mis-conducted; diode D2 can prevent the BAT+0 voltage from being injected into electronic devices such as MCU in the battery management system 500, causing damage to the MCU, etc.; diode D3 can prevent the drive signal (PW_EN signal) from flowing to capacitor C3 through the voltage regulator diode ZD1.

[0091] In this embodiment, the battery management system is effectively activated when the load is connected through a connecting line, a converter, etc., and at the same time, it can cleverly and accurately determine whether the battery management system is activated by the connecting line, the converter, etc. In addition, when the load is continuously online, after the circuit works for more than the set time window, the load connection identification circuit of the present application can stop working, so that the activation signal disappears, so that the battery management system can be shut down normally; even if the load is in the connected state, the energy storage device can combine the power detection circuit output by the DC module circuit to determine whether to continue to enable the DC module circuit, thereby reducing its own consumption and effectively improving the battery life of the energy storage product.

[0092] In an exemplary embodiment, the present application further provides an energy storage device, including a power supply, a battery management system, and a load access identification circuit as in the above embodiment.

[0093] In this embodiment, by integrating an efficient load access identification circuit, the energy storage device can quickly activate the battery management system when detecting load access and accurately execute the detection program, thereby improving the response speed and management accuracy of the device, ensuring stable and reliable power supply performance, and optimizing energy utilization efficiency.

[0094] In the description of this specification, the description with reference to the terms "some embodiments", "other embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic description of the above terms does not necessarily refer to the same embodiment or example.

[0095] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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.

[0096] The above-described 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 load access identification circuit, characterized in that: The load access identification circuit includes: a signal receiving module and an activation and detection module; The activation and detection modules are respectively connected to the signal receiving module, the power supply and the battery management system, and the signal receiving module is also connected to the power supply; The signal receiving module is used to output an electrical signal when receiving an activation trigger signal; The activation and detection module is used to output an activation signal to the activation end of the battery management system based on the power supply voltage of the power supply at a first moment after receiving the electrical signal, and output a detection signal to the detection end of the battery management system at a second moment after receiving the electrical signal; the second moment is later than the first moment, and the detection signal is used to characterize the type of the activation trigger signal; Wherein, the activation and detection module includes: a charge and discharge time window unit, a drive unit and a detection unit; The charge and discharge time window unit is respectively connected to the signal receiving module, the driving unit and the detection unit, the driving unit is also used to be correspondingly connected to the power supply and the battery management system, and the detection unit is also used to be connected to the battery management system; The charge and discharge time window unit is used to trigger the driving unit to output the activation signal to the activation end of the battery management system at the first moment after charging starts based on the electrical signal, and to trigger the detection unit to output the detection signal to the detection end of the battery management system at the second moment after charging starts based on the electrical signal.

2. The load connection identification circuit according to claim 1, characterized in that The battery management system outputs a driving signal via the enabling terminal of the battery management system when receiving the activation signal; the activation and detection module is also used to continuously output the activation signal when receiving the driving signal.

3. The load connection identification circuit according to claim 1, characterized in that: The driving unit includes: a voltage stabilizing diode ZD1 and a first switch unit; the cathode of the voltage stabilizing diode ZD1 is connected to the charge and discharge time window unit, the anode of the voltage stabilizing diode ZD1 is connected to the controlled end of the first switch unit, the controlled end of the first switch unit is also used to connect to the battery management system, the input end of the first switch unit is used to connect to the power supply, and the output end of the first switch unit is used to connect to the battery management system; The detection unit includes: a voltage stabilizing diode ZD2 and a second switch unit; the cathode of the voltage stabilizing diode ZD2 is connected to the charge and discharge time window unit, the anode of the voltage stabilizing diode ZD1 is connected to the controlled end of the second switch unit, the input end of the second switch unit is used to access a preset voltage, and the output end of the second switch unit is used to connect to the battery management system; The reverse breakdown voltage of the Zener diode ZD2 is greater than the reverse breakdown voltage of the Zener diode ZD1.

4. The load connection identification circuit according to claim 3, characterized in that: The first switch unit includes: a resistor R5, a switch tube Q4, a switch tube Q3 and a resistor R6; the resistor R5 is connected in series between the anode of the voltage stabilizing diode ZD1 and the base of the switch tube Q4, the resistor R6 is connected in series between the collector of the switch tube Q4 and the base of the switch tube Q3, the emitter of the switch tube Q3 is used to connect to the power supply, the collector of the switch tube Q3 is used to connect to the battery management system, and the emitter of the switch tube Q4 is grounded; The second switch unit includes: a resistor R8, a switch tube Q5 and a resistor R9; the resistor R8 is connected in series between the anode of the voltage stabilizing diode ZD2 and the ground terminal, the base of the switch tube Q5 is connected to the anode of the voltage stabilizing diode ZD2, the emitter of the switch tube Q5 is grounded, the first end of the resistor R9 is used to access a preset voltage, and the second end of the resistor R9 is respectively connected to the collector of the switch tube Q5 and the battery management system.

5. The load connection identification circuit according to claim 3, characterized in that: The driving unit further includes: a diode D3 and a diode D2; The anode of the diode D3 is connected to the anode of the voltage regulator diode ZD1, the cathode of the diode D3 is connected to the controlled end of the first switch unit, the anode of the diode D2 is connected to the battery management system, and the cathode of the diode D2 is connected to the controlled end of the first switch unit.

6. The load connection identification circuit according to claim 3, characterized in that: The detection unit also includes: a resistor R7 and a capacitor C4; The resistor R7 is connected in series between the charging and discharging time window unit and the cathode of the voltage stabilizing diode ZD2, and the capacitor C4 is connected in series between the cathode of the voltage stabilizing diode ZD2 and the ground.

7. The load connection identification circuit according to claim 1, characterized in that: The charge and discharge time window unit includes: a switch tube Q2, a capacitor C3, a resistor R4, a resistor R3, a capacitor C2, a diode D1 and a resistor R2; The emitter of the switch tube Q2 is connected to the signal receiving module, the collector of the switch tube Q2 is connected to the first end of the capacitor C3, the resistor R3 and the capacitor C2 are connected in series between the base of the switch tube Q2 and the ground terminal, the first end of the capacitor C3 is also connected to the first end of the resistor R4, the first end of the resistor R4 is also respectively connected to the driving unit and the detection unit, the second end of the capacitor C3 and the second end of the resistor R4 are both grounded, the anode of the diode D1 is connected between the resistor R3 and the capacitor C2, the cathode of the diode is respectively connected to the first end of the resistor R2 and the signal receiving module, and the second end of the resistor R2 is grounded.

8. The load connection identification circuit according to claim 1, characterized in that: The signal receiving module includes: a switch tube Q1, a switch SW1, a capacitor C1 and a resistor R1; The emitter of the switch tube Q1 is used to connect to the power supply, the collector of the switch tube is connected to the activation and detection module, the resistor R1 and the switch SW1 are connected in series between the base of the switch tube Q1 and the ground terminal, the first end of the capacitor C1 is used to connect to the power supply, and the second end of the capacitor C1 is connected between the resistor R1 and the switch SW1.

9. An energy storage device, characterized in that: include: Power supply; Battery management system; And a load access identification circuit as described in any one of claims 1 to 8.

Images