Control circuit of energy storage equipment and energy storage equipment

Abstract

The invention provides a control circuit of energy storage equipment and the energy storage equipment. The control circuit of the energy storage equipment comprises a first direct current voltage reduction module, wherein the input end of the first direct current voltage reduction module is connected with the positive electrode of a battery pack; the input end of the switching circuit is connected with the output end of the first direct current voltage reduction module; the first end of the voltage division circuit is connected with the first output end of the switching circuit, and the second end of the voltage division circuit is grounded; the first end of the first switching tube is connected with the input end of the switching circuit, and the second end of the first switching tube is connected with the second output end of the switching circuit; the micro-control unit is used for controlling the first switch tube to be turned on or turned off according to a first level signal detected on the voltage division circuit when the switch circuit is in the on state, the technical scheme reduces the probability that an arc appears on a contact of the switch circuit, and then the operation safety of the control circuit of the energy storage equipment is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage devices, and in particular to a control circuit of an energy storage device and an energy storage device. Background Art

[0002] In related technologies, such as Figure 1 As shown, the energy storage device 200' includes a battery pack 202' and a control circuit 100' of the energy storage device, wherein the control circuit 100' of the energy storage device includes a voltage conversion module 102', a key switch K', a BMS board 104', an air switch 106', a main relay 108', a pre-charge relay 110' and a pre-charge resistor Rs'.

[0003] The control circuit 100' of the energy storage device uses a key switch K' to directly close and open to realize power-on and power-off.

[0004] The key switch K' is directly connected to the positive electrode of the battery pack. When the output voltage of the battery pack is relatively high, an arc is likely to occur on the key switch K', affecting the safety of electricity use. Summary of the invention

[0005] The present invention aims to at least solve the technical problem existing in the prior art or related art that when the output voltage of the battery pack is relatively high, an arc is easily generated on the key switch, thereby affecting the safety of electricity use.

[0006] To this end, a first aspect of the present invention is to provide a control circuit for an energy storage device.

[0007] A second aspect of the present invention provides an energy storage device.

[0008] In view of this, according to a first aspect of the present invention, the present invention provides a control circuit of an energy storage device, the energy storage device includes a battery pack, and the control circuit of the energy storage device includes: a first DC step-down module, the input end of the first DC step-down module is connected to the positive electrode of the battery pack; a switch circuit, the input end of the switch circuit is connected to the output end of the first DC step-down module; a voltage divider circuit, the first end of the voltage divider circuit is connected to the first output end of the switch circuit, and the second end of the voltage divider circuit is grounded; a first switch tube, the first end of the first switch tube is connected to the input end of the switch circuit, and the second end of the first switch tube is connected to the second output end of the switch circuit; a micro control unit, which is used to control the first switch tube to be turned on or off according to a first level signal detected on the voltage divider circuit when the switch circuit is in an on state.

[0009] The present invention proposes a control circuit of an energy storage device, which includes a first DC step-down module, a switch circuit, a voltage divider circuit, a first switch tube and a microcontroller unit. The first DC step-down module is located between the positive electrode of the battery pack and the switch circuit. Therefore, under the voltage reduction effect of the first DC step-down module, the voltage acting on the switch circuit will be reduced, so that the probability of arcing on the contacts of the switch circuit is reduced during the process of the switch circuit changing from the disconnected state to the on state, thereby improving the safety of the control circuit operation of the energy storage device.

[0010] In addition, in the above technical solution, the switch circuit and the first switch tube are actually connected in parallel, so after the user operates the switch circuit to close and conduct, the first switch tube can be used to keep the battery pack from outputting power. Obviously, in the process of the battery pack supplying power to the outside, there is no need to pass through the switch circuit, that is, there is no need to keep the switch circuit turned on all the time, thus reducing the risk of switch circuit failure, and improving the reliability of the control circuit of the energy storage device without affecting the operation of the control circuit of the energy storage device.

[0011] Specifically, when the switch circuit is turned on, the battery pack can temporarily supply power to the outside, and the microcontroller unit can know the user's intention to operate the switch circuit according to the detected level signal, and control the first switch tube to turn on or off according to the detected intention of the switch circuit. In this process, the switch circuit only plays the role of receiving the user's operation, and it can be disconnected after the user's operation, so that when the first switch tube is turned on, there is no need to keep the switch circuit turned on all the time, thereby reducing the risk of failure of the switch circuit.

[0012] In the above technical solution, the setting of the voltage divider circuit enables the microcontroller unit to sense the opening and closing status of the switch circuit, and can also know the user's intention to operate the switch circuit based on the first level signal detected on the voltage divider circuit, and then control the conduction or cutoff of the first switch tube to achieve power-on and power-off control.

[0013] In addition, the control circuit of the energy storage device proposed by the present invention also has the following additional technical features.

[0014] In some technical schemes, optionally, the switching circuit includes: a first switch, the first end of the first switch is respectively connected to the output end of the first DC step-down module and the first end of the first switch tube, and the second end of the first switch is connected to the first end of the voltage divider circuit; a first diode, the anode of the first diode is connected to the second end of the first switch, and the cathode of the first diode is connected to the second end of the first switch tube; wherein, when the switching circuit is in the on state, the first switch is in the on state.

[0015] In this technical solution, the provision of the first diode can ensure that when the first switch tube is turned on, the voltage at the second end of the first switch tube will not act on the first switch, thereby improving the reliability of the control circuit of the energy storage device.

[0016] In some technical solutions, optionally, the first switch is a spring reset button.

[0017] In some technical schemes, optionally, the switching circuit includes: a dual-channel switch, the first end of the first channel in the dual-channel switch is respectively connected to the output end of the first DC step-down module and the first end of the first switch tube, the second end of the first channel in the dual-channel switch is connected to the second end of the first switch tube, the first end of the second channel in the dual-channel switch is connected to the output end of the first DC step-down module, and the second end of the second channel in the dual-channel switch is connected to the first end of the voltage divider circuit.

[0018] In this technical solution, a dual-channel switch can be used to replace the first switch and the first diode used in combination. In this process, the dual-channel switch can be used to achieve the same function while reducing the number of components used and the volume of the control circuit of the energy storage device.

[0019] In some technical schemes, optionally, the microcontroller unit is specifically used to: determine based on the first level signal that the detected level is greater than or equal to the first level and the duration is greater than or equal to the first duration, and determine that a power-on signal is detected; when the power-on signal is detected, the microcontroller unit outputs a first control signal, and the first switch tube is in a conductive state in response to the first control signal.

[0020] In this technical solution, when the user operates the switch circuit to turn on, the voltage output from the output end of the first DC step-down module will pass through the voltage divider circuit. At this time, the first level signal detected on the voltage divider circuit will be different according to the user's operation. If the detected level is greater than or equal to the first level and the duration is greater than or equal to the first duration, it is determined that the user's operation intention is to power on the control circuit of the energy storage device. At this time, it is determined that the power-on signal is detected, and when the power-on signal is detected, the first control signal is output to control the first switch tube to turn on.

[0021] In some technical schemes, optionally, a first control signal is output to control the conduction of the first switch tube. The micro control unit is also used to determine that the switch circuit is reset when it detects that the level at the first output end of the switch circuit drops from the first level to the second level. At this time, the first control signal is continuously output so that the micro control unit can remain powered on and work.

[0022] In some technical solutions, optionally, the first duration can be determined according to actual usage needs, which will not be elaborated here.

[0023] Exemplarily, the first duration is 2 seconds.

[0024] In some technical schemes, optionally, the microcontroller unit is specifically used to: determine, based on the first level signal, that the detected level increases from the second level to the first level, and remains greater than or equal to the first level for a duration greater than or equal to a second duration, and determine that a power-off signal is detected; when the microcontroller unit detects the power-off signal, the microcontroller unit stops outputting the first control signal, and outputs the second control signal, and the first switch tube is in an off state in response to the second control signal; wherein the second duration is greater than the first duration.

[0025] In this technical solution, after the control circuit of the energy storage device is powered on, the micro control unit is powered on. If the user operates the switch circuit to turn it on again, obviously, the level on the first output end of the switch circuit will increase.

[0026] Based on this, if the detected level increases from the second level to the first level, and remains greater than or equal to the first level for a duration greater than or equal to the second duration, it is determined that the user's operation intention is to power off the control circuit of the energy storage device. At this time, it is determined that a power-off signal is detected. At this time, the microcontroller stops outputting the first control signal and outputs the second control signal so that the first switch tube can be turned off in response to the second control signal.

[0027] During this process, the switch circuit can be automatically reset after the user's operation. Therefore, after power is off, the switch circuit can remain in the disconnected state, and there is no need to keep the switch circuit turned on all the time. Therefore, the risk of failure of the switch circuit is reduced, and the reliability of the control circuit of the energy storage device is improved without affecting the operation of the control circuit of the energy storage device.

[0028] In some technical solutions, the second duration can be determined according to actual usage needs, which will not be elaborated here.

[0029] Exemplarily, the second duration is 3 seconds.

[0030] In some technical solutions, optionally, the control circuit of the energy storage device also includes a first relay, which is connected in series between the positive electrode and the positive output terminal of the battery pack. The micro control unit is also used to: when the switch circuit is turned on again, determine based on the first level signal that the duration of the detected level being greater than or equal to the first level is greater than or equal to a third duration, and determine that a start signal is detected; when the micro control unit detects the start signal, the micro control unit drives the first relay to turn on; wherein the third duration is greater than the first duration.

[0031] In this technical solution, the first relay will not be turned on at the moment the control circuit of the energy storage device is powered on. Therefore, the risk of short circuit and electric shock in the control circuit of the energy storage device can be reduced, thereby improving the reliability of the control circuit of the energy storage device.

[0032] Specifically, in the related technical solution, the first relay will automatically turn on after the power-on self-test of the control circuit of the energy storage device is completed, thereby causing the battery pack to automatically output voltage to the outside.

[0033] In the technical solution of the present invention, when the switch circuit is turned on again, the micro control unit can draw power from the battery pack and then power on for self-test. If the user operates the switch circuit again, a level greater than or equal to the first level will be detected on the voltage divider circuit. If the duration of the level is greater than or equal to the third duration, it is determined that the user's operation intention is to output power. At this time, it is determined that the start signal is detected, so that the micro control unit responds to the start signal to control the first relay to be turned on, thereby achieving external output voltage.

[0034] During this process, the user can control whether to output power to the outside by operating the switch circuit, reducing the risk of short circuit and electric shock and improving the reliability of the control circuit of the energy storage device.

[0035] In some technical solutions, optionally, the third duration can be determined according to actual usage needs, which will not be described in detail here.

[0036] Exemplarily, the third duration is 2 seconds.

[0037] In some technical solutions, optionally, the control circuit of the energy storage device also includes: a pre-charging relay, a first end of the pre-charging relay is connected to the first end of the first relay; a pre-charging resistor, a first end of the pre-charging resistor is connected to the second end of the pre-charging relay, and the second end of the pre-charging resistor is connected to the second end of the first relay; wherein the microcontroller unit is also used to: control the pre-charging relay to be turned on or off.

[0038] In this technical solution, a pre-charging relay and a pre-charging resistor are provided to form a pre-charging circuit. During this process, the pre-charging circuit can be used for pre-charging, which can extend the service life of the device to be charged connected to the energy storage device, thereby reducing the replacement frequency of the battery in the device to be charged and increasing the service life of the device to be charged.

[0039] In some technical schemes, optionally, the voltage divider circuit includes: a first resistor, a first end of the first resistor is connected to the first output end of the switching circuit; a second resistor, a first end of the second resistor is connected to the second end of the first resistor, and the second end of the second resistor is grounded; wherein the first level signal is the level signal at the first end of the second resistor.

[0040] In this technical solution, the first resistor and the second resistor are connected in series between the first output terminal of the switching circuit and the ground. Therefore, when the switching circuit is turned on, a voltage drop will be formed on the first resistor and the second resistor. When the switching circuit is turned off, the second end of the first switch is not connected to the positive electrode of the battery pack. Therefore, no voltage drop will be formed on the first resistor and the second resistor. Based on this, the current state of the switching circuit can be known according to the level signal at the first end of the second resistor.

[0041] In this process, the user's operating intention can be known based on the user's operation of the switch circuit, thereby achieving precise control of the control circuit of the energy storage device.

[0042] In some technical schemes, optionally, the control circuit of the energy storage device also includes: a driving circuit, which is connected in series between the switch control end of the microcontroller unit and the control end of the first switch tube, and the driving circuit includes: a trigger, the input end of the trigger is connected to the switch control end of the microcontroller unit; a second switch tube, the first end of the second switch tube is connected to the control end of the first switch tube, the second end of the second switch tube is grounded, and the control end of the second switch tube is connected to the output end of the trigger; a third resistor, the first end of the third resistor is connected to the first end of the first switch tube, and the second end of the third resistor is connected to the control end of the first switch tube.

[0043] In this technical solution, by setting a trigger, the microcontroller unit does not need to output the first control signal and the second control signal all the time, which is beneficial to reducing the power consumption of the control circuit of the energy storage device.

[0044] By setting up a second switch tube so that the second switch tube can be used to indirectly control the first switch tube, it is possible to use a smaller drive signal to drive the control of a switch tube with a larger current and a larger voltage. In this process, the requirements for the driving capability of the microcontroller unit can be reduced, thereby reducing the manufacturing cost of the control circuit of the energy storage device.

[0045] In the above technical solution, by setting the third resistor, the second switch tube can meet the control requirements of on and off, thereby realizing the drive control of the first switch tube.

[0046] In some technical solutions, optionally, the driving circuit further includes: a fourth resistor, which is connected in series between the first end of the second switch tube and the control end of the first switch tube.

[0047] In this technical solution, a fourth resistor is provided so as to utilize the fourth resistor to limit the current flowing through the control end of the first switch tube. In this process, the probability of the first switch tube being damaged due to overcurrent can be reduced, thereby improving the reliability of the control circuit of the energy storage device.

[0048] In some technical solutions, optionally, the control circuit of the energy storage device also includes: a second DC step-down module, the input end of the second DC step-down module is connected to the second end of the first switching tube; a low-voltage difference linear regulator, the input end of the low-voltage difference linear regulator is connected to the output end of the second DC step-down module, and the output end of the low-voltage difference linear regulator is used for output power supply.

[0049] In this technical solution, the second DC step-down module and the low-voltage difference linear regulator can further step down the voltage output by the first DC step-down module, and use the low-voltage difference linear regulator to output a stable voltage. In this process, the low-voltage difference linear regulator can be used to output a stable power supply, thereby meeting the power supply needs of the power-consuming modules or equipment in the control circuit of the energy storage device.

[0050] In some technical solutions, optionally, the output end of the low voltage difference linear regulator is connected to the power supply end of the micro control unit, that is, the low voltage difference linear regulator is used to supply power to the micro control unit.

[0051] In some technical schemes, optionally, the control circuit of the energy storage device also includes: a light emitting diode, which is connected to a micro control unit; the micro control unit is also used to: control the light emitting diode to light up based on detecting a power-on signal; control the light emitting diode to flash based on detecting a power-off signal; control the light emitting diode to emit a first color of light based on detecting a power-on signal and passing a self-test; control the light emitting diode to emit a second color of light based on detecting a power-on signal and failing a self-test.

[0052] In this technical solution, the light emitting diodes are able to present different display effects according to different signals detected by the micro control unit.

[0053] During this process, users can determine the status of the energy storage device's control circuit based on whether the LED is always on, flashing, and the color displayed. Operators can use visual information to identify the correctness of the operation and reduce the possibility of misoperation and operational failure.

[0054] In some technical solutions, optionally, the first color is green and the second color is red.

[0055] In some technical schemes, optionally, the control circuit of the energy storage device also includes: an air switch, which is connected in series between the battery pack and the power supply output terminal, the power supply output terminal includes a positive output terminal and a negative output terminal, the first end of the air switch is connected to the positive electrode of the battery pack, the second end of the air switch is connected to the negative electrode of the battery pack, the third end of the air switch is respectively connected to the input end and the positive output end of the first DC step-down module, and the fourth end of the air switch is connected to the negative output end; wherein, the micro control unit is also used to: control the air switch to disconnect when a power-off signal is detected.

[0056] In this technical solution, since the third end of the air switch is connected to the input end of the first DC step-down module, the set air switch can be used to cut off the power output of the battery pack, thereby improving the reliability of the control circuit of the energy storage device.

[0057] According to a second aspect of the present invention, the present invention provides an energy storage device, comprising: a battery pack; and a control circuit of the energy storage device as described above.

[0058] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0060] Figure 1 A schematic diagram of an energy storage device in the related art is shown;

[0061] Figure 2 One of the schematic diagrams of a control circuit of an energy storage device in an embodiment of the present invention is shown;

[0062] Figure 3 A second schematic diagram showing a control circuit of an energy storage device in an embodiment of the present invention;

[0063] Figure 4 A schematic flow chart of a control method of a control circuit of an energy storage device in an embodiment of the present invention is shown;

[0064] Figure 5 A third schematic diagram of a control circuit of an energy storage device in an embodiment of the present invention is shown.

[0065] in, Figure 1 The corresponding relationship between the reference numerals and the component names is as follows:

[0066] 200' energy storage device, 202' battery pack, 100' control circuit of energy storage device, 102' voltage conversion module, 104' BMS board, K' key switch, 106' air switch, 108' main relay, 110' pre-charge relay, Rs' pre-charge resistor.

[0067] in, Figure 2 , Figure 3 and Figure 5 The corresponding relationship between the reference numerals and the component names is as follows:

[0068] 100 control circuit of energy storage device, 102 first DC step-down module, 103 switching circuit, Ks dual-channel switch, 104 voltage divider circuit, 106 micro control unit, 108 first relay, K first switch, 110 pre-charge relay, 112 drive circuit, 1122 trigger, 114 second DC step-down module, 116 air switch, D1 first diode, PACK+ positive output terminal, PACK- negative output terminal, Rs pre-charge resistor, R1 first resistor, R2 second resistor, R3 third resistor, R4 fourth resistor, Q1 first switch tube, Q2 second switch tube, LDO low voltage difference linear regulator, LED light emitting diode, 200 energy storage device, 202 battery pack. DETAILED DESCRIPTION

[0069] In order to more clearly understand the above aspects, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0070] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0071] In one embodiment of the present application, Figure 2 and Figure 5 As shown, a control circuit 100 of an energy storage device is provided, the energy storage device 200 includes a battery pack 202, and the control circuit 100 of the energy storage device includes: a first DC buck module 102, the input end of the first DC buck module 102 is connected to the positive electrode of the battery pack 202; a switch circuit 103, the input end of the switch circuit 103 is connected to the output end of the first DC buck module 102; a first switch K, the first end of the first switch K is connected to the output end of the first DC buck module 102; a first diode D1, the anode of the first diode D1 is connected to the first The second end of the switch K is connected; a voltage divider circuit 104, the first end of the voltage divider circuit 104 is connected to the first output end of the switch circuit 103, and the second end of the voltage divider circuit 104 is grounded; a first switch tube Q1, the first end of the first switch tube Q1 is connected to the input end of the switch circuit 103, and the second end of the first switch tube Q1 is connected to the second output end of the switch circuit 103; a micro control unit 106, which is used to control the first switch tube Q1 to be turned on or off according to the first level signal detected on the voltage divider circuit 104 when the switch circuit 103 is in the on state.

[0072] The present invention proposes a control circuit 100 for an energy storage device, which includes a first DC step-down module 102, a switch circuit 103, a voltage divider circuit 104, a first switch tube Q1, and a microcontroller unit 106. The first DC step-down module 102 is located between the positive electrode of the battery pack 202 and the switch circuit 103. Therefore, under the voltage reduction effect of the first DC step-down module 102, the voltage acting on the switch circuit 103 will be reduced, so that the probability of arcing on the contacts of the switch circuit 103 is reduced during the process of the switch circuit 103 changing from the disconnected state to the conductive state, thereby improving the safety of the operation of the control circuit 100 of the energy storage device.

[0073] In addition, in the above embodiment, the switch circuit 103 and the first switch tube Q1 are actually connected in parallel, so after the user operates the switch circuit 103 to close, the first switch tube Q1 can be used to keep the battery pack 202 from outputting power. Obviously, in the process of the battery pack 202 supplying power to the outside, there is no need to pass through the switch circuit 103, that is, there is no need to keep the switch circuit 103 turned on all the time, thus reducing the risk of failure of the switch circuit 103, and improving the reliability of the control circuit 100 of the energy storage device without affecting the operation of the control circuit 100 of the energy storage device.

[0074] Specifically, when the switch circuit 103 is turned on, the battery pack 202 can temporarily supply power to the outside, and the micro control unit 106 can know the user's intention to operate the switch circuit 103 according to the detected level signal, and control the first switch tube Q1 to turn on or off according to the detected intention of the switch circuit 103. In this process, the switch circuit 103 only plays the role of receiving the user's operation, and it can be disconnected after the user's operation, so that when the first switch tube Q1 is turned on, there is no need to keep the switch circuit 103 turned on all the time, thereby reducing the risk of failure of the switch circuit 103.

[0075] In the above embodiment, the voltage divider circuit 104 is configured so that the microcontroller unit 106 can sense the opening and closing status of the switch circuit 103, and can also know the user's intention to operate the switch circuit 103 based on the first level signal detected on the voltage divider circuit 104, and then control the conduction or cutoff of the first switch tube Q1 to achieve power-on and power-off control.

[0076] In some technical solutions, optionally, as Figure 2As shown, the switch circuit 103 includes: a first switch K, a first end of the first switch K is respectively connected to the output end of the first DC step-down module 102 and the first end of the first switch tube, and a second end of the first switch is connected to the first end of the voltage divider circuit 104; a first diode D1, an anode of the first diode D1 is connected to the second end of the first switch K, and a cathode of the first diode is connected to the second end of the first switch tube Q1; wherein, when the switch circuit 103 is in the on state, the first switch K is in the on state.

[0077] In the above embodiment, the provision of the first diode D1 can ensure that when the first switch tube Q1 is turned on, the voltage at the second end of the first switch tube Q1 will not act on the switch circuit 103, thereby improving the reliability of the control circuit 100 of the energy storage device.

[0078] In some embodiments, optionally, the first switch K is a spring return button.

[0079] In some embodiments, optionally, Figure 5 As shown, the switch circuit 103 includes: a dual-channel switch Ks, wherein the first end of the first channel in the dual-channel switch Ks is respectively connected to the output end of the first DC step-down module 102 and the first end of the first switch tube Q1, the second end of the first channel in the dual-channel switch Ks is connected to the second end of the first switch tube Q1, the first end of the second channel in the dual-channel switch Ks is connected to the output end of the first DC step-down module 102, and the second end of the second channel in the dual-channel switch Ks is connected to the first end of the voltage divider circuit 104.

[0080] In this embodiment, a dual-channel switch Ks can be used to replace the first switch K and the first diode D1 used in combination. In this process, the dual-channel switch Ks can be used to achieve the same function while reducing the number of components used and the volume of the control circuit of the energy storage device.

[0081] In some embodiments, optionally, the micro control unit 106 is specifically used to: determine based on the first level signal that the detected level is greater than or equal to the first level and the duration is greater than or equal to the first duration, and determine that a power-on signal is detected; when the power-on signal is detected, the micro control unit 106 outputs a first control signal, and the first switch tube Q1 is in the on state in response to the first control signal.

[0082] In this embodiment, when the user operates the switch circuit 103 to turn on, the voltage output from the output end of the first DC step-down module 102 will pass through the voltage divider circuit 104. At this time, the first level signal detected on the voltage divider circuit 104 will be different according to the user's operation. If the detected level is greater than or equal to the first level and the duration is greater than or equal to the first duration, it is determined that the user's operation intention is to power on the control circuit 100 of the energy storage device. At this time, it is determined that the power-on signal is detected, and when the power-on signal is detected, the first control signal is output to control the first switch tube Q1 to turn on.

[0083] In some embodiments, optionally, a first control signal is output to control the first switch tube Q1 to be turned on. The micro control unit 106 is also used to determine that the switch circuit 103 is reset when it detects that the level at the first output terminal of the switch circuit 103 decreases from the first level to the second level. At this time, the first control signal is continuously output so that the micro control unit 106 can remain powered on and work.

[0084] In some embodiments, optionally, the first duration can be determined according to actual usage needs, which will not be described in detail here.

[0085] Exemplarily, the first duration is 2 seconds.

[0086] In some embodiments, optionally, the microcontroller unit 106 is specifically used to: determine based on the first level signal that the detected level increases from the second level to the first level, and remains greater than or equal to the first level for a duration greater than or equal to a second duration, and determine that a power-off signal is detected; when the microcontroller unit 106 detects the power-off signal, the microcontroller unit 106 stops outputting the first control signal, and outputs the second control signal, and the first switch tube Q1 is in the off state in response to the second control signal; wherein the second duration is greater than the first duration.

[0087] In this embodiment, after the control circuit 100 of the energy storage device is powered on, the micro control unit 106 is powered on. If the user operates the switch circuit 103 to turn it on again, obviously, the level on the first output terminal of the switch circuit 103 will increase.

[0088] Based on this, if the detected level increases from the second level to the first level, and remains greater than or equal to the first level for a duration greater than or equal to the second duration, it is determined that the user's operation intention is to power off the control circuit 100 of the energy storage device. At this time, it is determined that a power-off signal is detected. At this time, the micro control unit 106 stops outputting the first control signal and outputs the second control signal so that the first switch tube Q1 can be turned off in response to the second control signal.

[0089] During this process, the switch circuit 103 can be automatically reset after the user's operation. Therefore, after power is off, the switch circuit 103 can remain in the disconnected state, and there is no need to keep the switch circuit 103 turned on all the time. Therefore, the risk of failure of the switch circuit 103 is reduced, and the reliability of the control circuit 100 of the energy storage device is improved without affecting the operation of the control circuit 100 of the energy storage device.

[0090] In some embodiments, the second duration can be determined based on actual usage needs, which will not be further elaborated here.

[0091] Exemplarily, the second duration is 3 seconds.

[0092] In some embodiments, optionally, the control circuit 100 of the energy storage device also includes a first relay 108, which is connected in series between the positive electrode of the battery pack 202 and the positive output terminal PACK+, and the micro control unit 106 is also used for: when the switch circuit 103 is turned on again, determining based on the first level signal that the duration of the detected level being greater than or equal to the first level is greater than or equal to the third duration, and determining that a start signal is detected; when the micro control unit 106 detects the start signal, the micro control unit 106 drives the first relay 108 to turn on; wherein the third duration is less than the first duration.

[0093] In this embodiment, the first relay 108 will not be turned on at the moment the control circuit 100 of the energy storage device is powered on, thereby reducing the risk of short circuit and electric shock in the control circuit 100 of the energy storage device, thereby improving the reliability of the control circuit 100 of the energy storage device.

[0094] Specifically, in the relevant embodiment, the first relay 108 will automatically turn on after the power-on self-test of the control circuit 100 of the energy storage device is completed, thereby causing the battery pack 202 to automatically output voltage to the outside.

[0095] In an embodiment of the present invention, when the switch circuit 103 is turned on again, the micro control unit 106 can draw power from the battery pack 202 and then power on for self-test. If the user operates the switch circuit 103 again, a level greater than or equal to the first level will be detected on the voltage divider circuit 104. If the duration of the level is greater than or equal to the third duration, it is determined that the user's operation intention is to output power. At this time, it is determined that the start signal is detected, so that the micro control unit 106 responds to the start signal to control the first relay 108 to be turned on, thereby outputting voltage to the outside.

[0096] During this process, the user can control whether to output power to the outside by operating the switch circuit 103, thereby reducing the risk of short circuit and electric shock and improving the reliability of the control circuit 100 of the energy storage device.

[0097] In some embodiments, optionally, the third duration can be determined according to actual usage needs, which will not be described in detail here.

[0098] Exemplarily, the third duration is 2 seconds.

[0099] In some embodiments, optionally, the control circuit 100 of the energy storage device also includes: a pre-charging relay 110, wherein the first end of the pre-charging relay 110 is connected to the first end of the first relay 108; a pre-charging resistor Rs, wherein the first end of the pre-charging resistor Rs is connected to the second end of the pre-charging relay 110, and the second end of the pre-charging resistor Rs is connected to the second end of the first relay 108; wherein the microcontroller unit 106 is also used to: control the pre-charging relay 110 to be turned on or off.

[0100] In this embodiment, a pre-charging relay 110 and a pre-charging resistor Rs are provided to form a pre-charging circuit. During this process, the pre-charging circuit can be used for pre-charging, which can extend the service life of the device to be charged connected to the energy storage device 200, thereby reducing the replacement frequency of the battery in the device to be charged and increasing the service life of the device to be charged.

[0101] In some embodiments, optionally, the voltage divider circuit 104 includes: a first resistor R1, a first end of the first resistor R1 is connected to the first output end of the switch circuit 103; a second resistor R2, a first end of the second resistor R2 is connected to the second end of the first resistor R1, and the second end of the second resistor R2 is grounded; wherein the first level signal is a level signal at the first end of the second resistor R2.

[0102] In this embodiment, the first resistor R1 and the second resistor R2 are connected in series between the first output terminal of the switch circuit 103 and the ground. Therefore, when the switch circuit 103 is turned on, a voltage drop will be formed on the first resistor R1 and the second resistor R2. When the switch circuit 103 is turned off, the second end of the switch circuit 103 is not connected to the positive electrode of the battery pack 202. Therefore, no voltage drop will be formed on the first resistor R1 and the second resistor R2. Based on this, the current state of the switch circuit 103 can be known according to the level signal at the first end of the second resistor R2.

[0103] In this process, the user's operation intention can be known based on the user's operation on the switch circuit 103, thereby achieving precise control of the control circuit 100 of the energy storage device.

[0104] In some embodiments, optionally, the control circuit 100 of the energy storage device also includes: a driving circuit 112, which is connected in series between the switch control end of the micro control unit 106 and the control end of the first switch tube Q1, and the driving circuit 112 includes: a trigger 1122, and the input end of the trigger 1122 is connected to the switch control end of the micro control unit 106; a second switch tube Q2, a first end of the second switch tube Q2 is connected to the control end of the first switch tube Q1, a second end of the second switch tube Q2 is grounded, and the control end of the second switch tube Q2 is connected to the output end of the trigger 1122; a third resistor R3, a first end of the third resistor R3 is connected to the first end of the first switch tube Q1, and a second end of the third resistor R3 is connected to the control end of the first switch tube Q1.

[0105] In this embodiment, by setting the trigger 1122, the micro control unit 106 does not need to output the first control signal and the second control signal all the time, which is helpful to reduce the power consumption of the control circuit 100 of the energy storage device.

[0106] By setting the second switch tube Q2 so as to use the second switch tube Q2 to achieve indirect control of the first switch tube Q1, it is possible to use a smaller drive signal to drive the control of a switch tube with a larger current and a larger voltage. In this process, the requirements for the driving capability of the microcontroller unit 106 can be reduced, thereby reducing the manufacturing cost of the control circuit 100 of the energy storage device.

[0107] In the above embodiment, by setting the third resistor R3, the second switch tube Q2 can meet the control requirements of on and off, thereby realizing the drive control of the first switch tube Q1.

[0108] In some embodiments, optionally, the driving circuit 112 further includes: a fourth resistor R4, which is connected in series between the first end of the second switch tube Q2 and the control end of the first switch tube Q1.

[0109] In this embodiment, the fourth resistor R4 is provided so as to utilize the fourth resistor R4 to limit the current flowing through the control end of the first switch tube Q1. In this process, the probability of the first switch tube Q1 being damaged due to overcurrent can be reduced, thereby improving the reliability of the control circuit 100 of the energy storage device.

[0110] In some embodiments, optionally, the control circuit 100 of the energy storage device also includes: a second DC step-down module 114, the input end of the second DC step-down module 114 is connected to the second end of the first switch tube Q1; a low voltage difference linear regulator LDO, the input end of the low voltage difference linear regulator LDO is connected to the output end of the second DC step-down module 114, and the output end of the low voltage difference linear regulator LDO is used for output power supply.

[0111] In this embodiment, the second DC step-down module 114 and the low voltage difference linear regulator LDO can further step down the voltage output by the first DC step-down module 102, and use the low voltage difference linear regulator LDO to output a stable voltage. In this process, the low voltage difference linear regulator LDO can be used to output a stable power supply, thereby meeting the power supply needs of the power-consuming module or equipment in the control circuit 100 of the energy storage device.

[0112] In some embodiments, optionally, the output end of the low-dropout linear regulator LDO is connected to the power supply end of the micro control unit 106 , that is, the micro control unit 106 is powered by the low-dropout linear regulator LDO.

[0113] In some embodiments, optionally, the control circuit 100 of the energy storage device also includes: a light emitting diode LED, which is connected to the micro control unit 106; the micro control unit 106 is also used to: control the light emitting diode LED to light up based on detecting a power-on signal; control the light emitting diode LED to flash based on detecting a power-off signal; control the light emitting diode LED to emit a first color of light based on detecting a power-on signal and passing a self-test; control the light emitting diode LED to emit a second color of light based on detecting a power-on signal and failing a self-test.

[0114] In this embodiment, the light emitting diode LED can present different display effects according to different signals detected by the micro control unit 106 .

[0115] During this process, the user can determine the status of the control circuit 100 of the energy storage device based on whether the light-emitting diode LED is always on, flashing, and the displayed color. The operator can use the visual information to identify the correctness of the operation and reduce the possibility of misoperation and operation failure.

[0116] In some embodiments, optionally, the first color is green and the second color is red.

[0117] In some embodiments, optionally, the control circuit 100 of the energy storage device also includes: an air switch 116, which is connected in series between the battery pack 202 and the power supply output end, the power supply output end includes a positive output end PACK+ and a negative output end PACK-, a first end of the air switch 116 is connected to the positive pole of the battery pack 202, a second end of the air switch 116 is connected to the negative pole of the battery pack 202, a third end of the air switch 116 is respectively connected to the input end and the positive output end PACK+ of the first DC step-down module 102, and a fourth end of the air switch 116 is connected to the negative output end PACK-; wherein the micro control unit 106 is also used to: when a power-off signal is detected, control the air switch 116 to disconnect.

[0118] In this embodiment, since the third end of the air switch 116 is connected to the input end of the first DC step-down module 102, the air switch 116 can be used to cut off the power output of the battery pack 202, thereby improving the reliability of the control circuit 100 of the energy storage device.

[0119] In some embodiments, optionally, Figure 3 As shown, the components in the control circuit 100 of the energy storage device except the switch circuit 103, the first DC buck module 102, the first relay 108, the pre-charge relay 110, the air switch 116 and the pre-charge resistor Rs are arranged on the battery management system board.

[0120] In some embodiments, optionally, specifically, the control circuit 100 of the energy storage device is arranged in a battery management system (BMS), the switch circuit 103 is a spring reset button, that is, a key switch, and the trigger 1122 is a D trigger, such as Figure 4 As shown, the control method for the control circuit of the energy storage device includes:

[0121] Step 402: The air switch is closed.

[0122] Step 404, long press the switch button for 3 seconds to turn on the device.

[0123] Step 406 , whether the self-check is normal, if the result is yes, execute step 408 , if the result is no, execute step 410 .

[0124] Step 408: Long press the button switch for 2 seconds to close the first relay.

[0125] Step 410, control the light emitting diode to light up red as an alarm.

[0126] Step 412, long press the switch button for 5 seconds to shut down.

[0127] Step 414, opening and closing.

[0128] Step 416, automatically shut down after 10 minutes.

[0129] Specifically, a first switch tube Q1 is provided in the control circuit 100 of the energy storage device, and a contact button, namely, a first switch K, is incorporated at both ends of the first switch tube Q1. At the same time, a first voltage-dividing resistor R1, a second resistor R2, and a first diode D1 that plays an anti-reverse role are added to the S pole of the first switch tube Q1. The voltage on the resistor that plays a voltage-dividing role is collected by the microcontroller unit 106. The microcontroller unit 106 determines the key state by collecting the voltage value after the voltage is divided by the first resistor R1 and the second resistor R2. When the key is not pressed, the microcontroller unit 106 collects a 0V voltage. When the key is pressed, the microcontroller unit 106 collects a 3.3V voltage.

[0130] ① When the air switch 116 of the battery pack 202 is closed, the first DC step-down module 102 directly outputs a 12V voltage, and the power supply of the entire BMS is provided by this 12V. Long press the button and release it after 3S. The LED light is on, indicating that the BMS is powered on;

[0131] ②After power-on, the battery pack 202 will self-check within 10 seconds. The result of the self-check will be displayed by the light-emitting diode (LED). When the light-emitting diode (LED) lights up red, it is a fault light, indicating that the battery pack 202 is faulty. The battery pack 202 will automatically shut down after 10 minutes, and thus requires professional maintenance; when the battery pack 202 self-checks without fault, the light-emitting diode (LED) lights up green;

[0132] ③ When the self-check is OK, long press the button, then the voltage divider circuit 104 composed of the first resistor R1 and the second resistor R2 will generate a voltage to the micro control unit 106 (normally when the button is not pressed, the voltage divider circuit 104 composed of the first resistor R1 and the second resistor R2 has no voltage). Release it after 2S, and the micro control unit 106 starts the black start function through the received voltage of about 2S. The micro control unit 106 sends a command to close the main circuit relay, that is, the first relay 108, so that power can be supplied to the outside;

[0133] Black start refers to the process in which a generator set with self-starting capability is started after the power system stops operating due to a fault, without external power supply, thereby driving other units in the system to gradually resume operation of the entire system. Black start service is an auxiliary service provided by generator sets to the power system to restore power supply to the system when there is a major power outage.

[0134] ④ Long press the button. At this time, the voltage divider circuit 104 composed of the first resistor R1 and the second resistor R2 will generate a voltage to the micro control unit 106. (When the button is not pressed normally, the voltage divider circuit 104 composed of the first resistor R1 and the second resistor R2 has no voltage). Release it after 5S. The micro control unit 106 shuts down through the received voltage of about 5S. The micro control unit 106 sends a command to the D trigger 1122 to turn off the first switch tube Q1. At the same time, the light emitting diode LED flashes. After 3S, the BMS is powered off and shut down. At the same time, the first relay 108 will also be disconnected, and the battery pack 202 can no longer supply power to the outside.

[0135] In some embodiments, optionally, the first switch tube Q1 is an N-type metal oxide semiconductor (Negative channel-Metal-Oxide-Semiconductor, NMOS).

[0136] In this embodiment, only one button is used to realize the power on, power off and black start functions, the control interface of the battery pack is simpler, only one button is set inside the battery pack, the internal available space is larger, and the number of wiring harnesses is reduced. Overall, it has comprehensive functions, simpler appearance, less internal space, and lower material and labor costs.

[0137] In one embodiment, the present invention provides an energy storage device, comprising: a battery pack; and a control circuit of the energy storage device as described in any one of the first aspects.

[0138] The term "first" or "second" in the specification and claims of the present application may include one or more of the features explicitly or implicitly. In the textual description of the present invention, unless otherwise specified, "plurality" means two or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally means that the objects connected before and after are in an "or" relationship.

[0139] In the text description of the present invention, it is understood that, except for explicit provisions and limitations, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be fixed connection, detachable connection, or integral connection; it can be mechanical structure connection or electrical connection; it can be direct connection between the two, or indirect connection between the two through an intermediate medium, or it can be internal communication between two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0140] In the claims, specification and drawings of the present invention, the description of the terms "one embodiment", "some embodiments", "specific embodiments" and the like 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 invention. In the claims, specification and drawings of the present invention, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0141] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A control circuit for an energy storage device, characterized in that: The energy storage device includes a battery pack, and the control circuit of the energy storage device includes: a first DC step-down module, wherein an input end of the first DC step-down module is connected to the positive electrode of the battery pack; A switch circuit, wherein an input end of the switch circuit is connected to an output end of the first DC step-down module; A voltage divider circuit, wherein a first end of the voltage divider circuit is connected to the first output end of the switch circuit, and a second end of the voltage divider circuit is grounded; a first switch tube, wherein a first end of the first switch tube is connected to an input end of the switch circuit, and a second end of the first switch tube is connected to a second output end of the switch circuit; The micro control unit is used to control the first switch tube to be turned on or off according to the first level signal detected on the voltage divider circuit when the switch circuit is in the on state.

2. The control circuit of the energy storage device according to claim 1, characterized in that: The switch circuit comprises: A first switch, wherein a first end of the first switch is respectively connected to the output end of the first DC step-down module and the first end of the first switch tube, and a second end of the first switch is connected to the first end of the voltage divider circuit; a first diode, wherein an anode of the first diode is connected to the second end of the first switch, and a cathode of the first diode is connected to the second end of the first switch tube; Wherein, when the switch circuit is in the on state, the first switch is in the on state.

3. The control circuit of the energy storage device according to claim 1, characterized in that: The switch circuit comprises: A dual-channel switch, wherein the first end of the first channel in the dual-channel switch is respectively connected to the output end of the first DC step-down module and the first end of the first switch tube, the second end of the first channel in the dual-channel switch is connected to the second end of the first switch tube, the first end of the second channel in the dual-channel switch is connected to the output end of the first DC step-down module, and the second end of the second channel in the dual-channel switch is connected to the first end of the voltage divider circuit.

4. The control circuit of the energy storage device according to claim 1, characterized in that: The micro control unit is specifically used for: Determine based on the first level signal that the duration for which the detected level is greater than or equal to the first level is greater than or equal to the first duration, and determine that a power-on signal is detected; When the micro control unit detects the power-on signal, it outputs a first control signal, and the first switch tube is in a conducting state in response to the first control signal.

5. The control circuit of the energy storage device according to claim 4, characterized in that: The micro control unit is specifically used for: Determining based on the first level signal that the detected level increases from the second level to the first level and remains greater than or equal to the first level for a duration greater than or equal to a second duration, determining that a power-off signal is detected; When the micro control unit detects the power-off signal, the micro control unit stops outputting the first control signal and outputs the second control signal, and the first switch tube is in an off state in response to the second control signal; The second duration is greater than the first duration.

6. The control circuit of the energy storage device according to claim 5, characterized in that: The control circuit of the energy storage device further includes a first relay, which is connected in series between the positive electrode and the positive electrode output terminal of the battery pack, and the micro control unit is further used for: When the switch circuit is turned on again, determining based on the first level signal that the duration for which the detected level is greater than or equal to the first level is greater than or equal to a third duration, and determining that a start signal is detected; When the micro control unit detects the start signal, the micro control unit drives the first relay to conduct; The third duration is shorter than the first duration.

7. The control circuit of the energy storage device according to claim 6, characterized in that: The control circuit of the energy storage device also includes: a pre-charging relay, a first end of the pre-charging relay being connected to a first end of the first relay; A pre-charging resistor, wherein a first end of the pre-charging resistor is connected to a second end of the pre-charging relay, and a second end of the pre-charging resistor is connected to a second end of the first relay; Wherein, the micro control unit is also used to control the pre-charging relay to be turned on or off.

8. The control circuit of the energy storage device according to any one of claims 1 to 7, characterized in that: The voltage divider circuit comprises: a first resistor, wherein a first end of the first resistor is connected to a first output end of the switch circuit; a second resistor, a first end of the second resistor being connected to a second end of the first resistor, and a second end of the second resistor being grounded; The first level signal is a level signal at the first end of the second resistor.

9. The control circuit of the energy storage device according to any one of claims 1 to 7, characterized in that: The control circuit of the energy storage device also includes: A driving circuit is connected in series between the switch control terminal of the micro control unit and the control terminal of the first switch tube, and the driving circuit includes: A trigger, wherein an input terminal of the trigger is connected to a switch control terminal of the micro control unit; a second switch tube, wherein a first end of the second switch tube is connected to a control end of the first switch tube, a second end of the second switch tube is grounded, and the control end of the second switch tube is connected to an output end of the trigger; A third resistor, wherein a first end of the third resistor is connected to the first end of the first switch tube, and a second end of the third resistor is connected to the control end of the first switch tube.

10. The control circuit of the energy storage device according to claim 9, characterized in that: The driving circuit further includes: A fourth resistor is connected in series between the first end of the second switch tube and the control end of the first switch tube.

11. The control circuit of the energy storage device according to any one of claims 1 to 7, characterized in that: The control circuit of the energy storage device also includes: A second DC step-down module, wherein an input end of the second DC step-down module is connected to a second end of the first switch tube; A low voltage dropout linear regulator, wherein the input end of the low voltage dropout linear regulator is connected to the output end of the second DC step-down module, and the output end of the low voltage dropout linear regulator is used for outputting power supply.

12. The control circuit of the energy storage device according to claim 6, characterized in that: The control circuit of the energy storage device also includes: A light emitting diode, wherein the light emitting diode is connected to the micro control unit; The micro control unit is also used for: Based on detecting the power-on signal, controlling the light-emitting diode to light up; Based on detecting the power-off signal, controlling the light emitting diode to flash; Based on the detection of the power-on signal and the passing of the self-test, controlling the light emitting diode to emit light of a first color; Based on the detection of the power-on signal and in the case that the self-test fails, the light emitting diode is controlled to emit light of a second color.

13. The control circuit of the energy storage device according to any one of claims 1 to 7, characterized in that: The control circuit of the energy storage device also includes: An air switch is connected in series between the battery pack and the power supply output end, the power supply output end includes a positive output end and a negative output end, the first end of the air switch is connected to the positive electrode of the battery pack, the second end of the air switch is connected to the negative electrode of the battery pack, the third end of the air switch is respectively connected to the input end of the first DC step-down module and the positive output end, and the fourth end of the air switch is connected to the negative output end; Wherein, the micro control unit is also used for: controlling the air switch to disconnect when a power-off signal is detected.

14. An energy storage device, characterized in that: include: Battery pack; A control circuit for an energy storage device as claimed in any one of claims 1 to 13.

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