Power supply circuit, battery monitoring circuit, and energy storage device

Abstract

To provide a power supply circuit, a battery monitoring circuit, and an energy storage device.SOLUTION: A battery 200 is connected to an external circuit 500 by a safety protection switch 400. A power supply circuit 100 includes a voltage conversion circuit 110, a first line 120, and a second line 130. The voltage conversion circuit 110 is connected to two terminals of a first switch 132 through the first line 120 and the second line 130, respectively. The voltage conversion circuit 110 is used to convert an output voltage of the battery 200 into an operating voltage of a management unit 300 through the first line 120 and supply power to the management unit 300. The second line 130 includes the first switch 132. The first switch 132 is used to be turned off when the safety protection switch 400 is turned off, so as to cause the battery 200 to supply power to the management unit 300 by the voltage conversion circuit 110 via the second line 130.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to the field of battery technology, and more particularly to power supply circuits, battery monitoring circuits and energy storage devices. [Background technology]

[0002] The Cell Monitor Unit (CMU) is responsible for measuring parameters such as the battery voltage, current, and temperature, and transmitting them to the Battery Management Unit (BMU). The BMU evaluates the data transmitted from the CMU, and protects the battery if the data is abnormal. Summary of the Invention [Problem to be solved by the invention]

[0003] In the related art, some types of batteries are generally self-powered, for example, home energy storage batteries are self-powered. In a self-powered type battery, the voltage output from the battery passes through a micro circuit breaker (MCB) and then is output to the CMU to supply power, so that the CMU can operate and monitor the battery. However, after the MCB is manually disconnected or the MCB is disconnected due to a fault, the battery power supply circuit to the CMU is disconnected, and the CMU board does not operate normally. In this way, in the event of a battery failure or safety risk, the CMU cannot monitor the battery, which is likely to cause battery damage or safety problems. [Means for solving the problem]

[0004] An embodiment of the present invention provides a power supply circuit, a battery monitoring circuit, and an energy storage device. The power supply circuit according to the embodiment of the present invention is used to supply power to a management unit of a battery. The battery is connected to an external circuit by a safety protection switch. The power supply circuit includes a voltage conversion circuit, a first line, and a second line. The voltage conversion circuits are connected to both ends of the safety protection switch by the first line and the second line, respectively, and when the first switch is closed, the voltage conversion circuit converts the output voltage of the battery through the first line into an operating voltage of the management unit to supply power to the management unit. The second line includes the first switch, and when the safety protection switch is disconnected, the first switch is closed, so that the battery supplies power to the management unit through the voltage conversion circuit via the second line.

[0005] In some embodiments, the management unit is used to control the disconnection of the first switch when it detects that the operating state of the battery is abnormal.

[0006] In some embodiments, the first switch is a manual switch that allows a user to manually disconnect.

[0007] In some embodiments, the first switch has a first end, a second end and a third end, the first end is connected to the battery, the second end is connected to the first line and the third end is connected to the voltage conversion circuit, and the first switch is selectable to connect the first end to the third end, connect the second end to the third end, or disconnect the first end to the third end and disconnect the second end to the third end.

[0008] In some embodiments, the management unit is used to disconnect the third end from the first end and the second end when it detects that the operating status of the battery is abnormal.

[0009] In some embodiments, the first switch is a single-pole, double-throw switch.

[0010] In some embodiments, the power supply circuit further comprises a third line, the battery is connected to the second line by the third line, the third line comprises a second switch, and when the second switch is disconnected, the connection between the battery and the second line is disconnected.

[0011] In some embodiments, the power supply circuit further comprises a fourth line, the fourth line connecting the first line and the third line, When the second switch is closed, the battery is in communication with the voltage conversion circuit by the third line, the fourth line and the first line.

[0012] In some embodiments, the second switch has a fourth end, a fifth end and a sixth end, where the fourth end is connected to the battery, the fifth end is floating, and the sixth end is connected to the second line, and the second switch selectably connects the fourth end to the sixth end, connects the fifth end to the sixth end, or disconnects the fourth end from the sixth end and disconnects the fifth end from the sixth end.

[0013] In some embodiments, the second switch is a single-pole, double-throw switch.

[0014] In some embodiments, the external circuit includes an energy storage current transformer and an external power source. When the safety protection switch is closed, the external power source charges the battery through the energy storage current transformer. When the safety protection switch is closed, the voltage conversion circuit is used to convert the output voltage of the energy storage current transformer through the first line to an operating voltage of the management unit to power the management unit.

[0015] In some embodiments, the power supply circuit comprises a fifth circuit, the fifth circuit being connected between the energy storage current transformer and the first circuit, the fifth circuit comprising a third switch, the third switch being used to close when the first switch is closed.

[0016] In some embodiments, the power supply circuit comprises an internal power supply, the internal power supply being connected to the management unit and used to power the management unit.

[0017] An embodiment of the present invention provides a battery monitoring circuit including the power supply circuit and the management unit according to any of the above embodiments.

[0018] An embodiment of the present invention provides an energy storage device including a battery monitoring circuit and a battery according to any of the above embodiments. Effect of the Invention

[0019] In the power supply circuit, the battery monitoring circuit, and the energy storage device according to the embodiment of the present invention, the power supply circuit supplies power to the management unit through two power supply circuits. One power supply circuit allows the battery voltage to reach the voltage conversion circuit through the safety protection switch and the first line, and the voltage conversion circuit further converts the battery voltage to the operating voltage of the management unit to power the management unit. The other power supply circuit allows the battery voltage to reach the voltage conversion circuit through the second line, and the voltage conversion circuit converts the battery voltage to the operating voltage of the management unit to power the management unit. In this way, when the safety protection switch is disconnected in various situations and the battery cannot be communicated with the first line by the voltage conversion circuit, the first switch is closed and the battery can be communicated with the second line by the voltage conversion circuit, and thus the battery voltage reaches the voltage conversion circuit through the second line, and the voltage conversion circuit converts the battery voltage to the operating voltage of the management unit to power the management unit, so that the management unit can operate normally. In this way, when the safety protection switch is disconnected in various circumstances, causing battery failure or safety risks, the management unit can avoid being unable to monitor the battery, thereby preventing damage to the battery or safety issues from occurring.

[0020] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the present application. [Brief description of the drawings]

[0021] The above and / or additional aspects and advantages of the present invention will become apparent and be easily understood from the following description of the embodiments taken in conjunction with the drawings. [Figure 1] FIG. 2 is a schematic diagram showing a power supply circuit according to an embodiment of the present invention. [Diagram 2] 1 is a schematic circuit diagram showing a power supply circuit according to a first embodiment of the present invention. [Diagram 3] FIG. 4 is another circuit schematic diagram showing the power supply circuit according to the first embodiment of the present invention. [Figure 4]FIG. 4 is a circuit schematic diagram showing a power supply circuit according to a second embodiment of the present invention. [Diagram 5] FIG. 11 is a circuit schematic diagram showing a power supply circuit according to a third embodiment of the present invention. [Figure 6] FIG. 11 is a circuit schematic diagram showing a power supply circuit according to a fourth embodiment of the present invention. [Figure 7] FIG. 11 is another circuit schematic diagram showing the power supply circuit according to the fourth embodiment of the present invention. [Figure 8] FIG. 11 is a circuit schematic diagram showing a power supply circuit according to a fifth embodiment of the present invention. [Figure 9] FIG. 13 is a circuit schematic diagram showing a power supply circuit according to a sixth embodiment of the present invention. [Figure 10] FIG. 13 is a circuit schematic diagram showing a power supply circuit according to a seventh embodiment of the present invention. [Figure 11] FIG. 13 is a circuit schematic diagram showing a power supply circuit according to an eighth embodiment of the present invention. [Figure 12] FIG. 13 is a circuit schematic diagram showing a power supply circuit according to a ninth embodiment of the present invention. [Figure 13] FIG. 2 is a schematic diagram showing a connection between a power supply circuit and an external circuit according to the present invention. [Figure 14] FIG. 23 is a circuit schematic diagram showing a power supply circuit according to a tenth embodiment of the present invention. [Figure 15] FIG. 23 is a circuit schematic diagram showing a power supply circuit according to an eleventh embodiment of the present invention. [Figure 16] FIG. 1 is a schematic diagram illustrating an energy storage device according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] Hereinafter, the embodiments of the present invention shown in the drawings will be described in detail, and in all the drawings, the same or similar reference numerals indicate the same or similar elements or elements having the same or similar functions. The embodiments described through the following reference drawings are illustrative and are for explaining the present invention, and should not be understood as limitations on the present invention.

[0023] In the related technology, a cell monitor unit (CMU) measures parameters such as the voltage, current, and temperature of a battery and transmits them to a battery management unit (BMU). The BMU evaluates the data transmitted from the CMU and, if the data is abnormal, protects the battery by issuing a request to reduce the current or cutting off the charging / discharging circuit to prevent the battery from exceeding the allowable usage conditions, and also manages the battery's electrical charge and temperature.

[0024] In the related art, some types of batteries are generally self-powered, for example, home energy storage batteries are self-powered. In a self-powered type battery, the voltage output from the battery passes through the MCB and then is output to the CMU to supply power, so that the CMU can operate and monitor the battery. However, after the MCB is manually disconnected or the MCB is disconnected due to a fault, the battery power supply circuit to the CMU is disconnected, and the CMU board does not operate normally. In this way, in the event of a battery failure or safety risk, the CMU cannot monitor the battery, which is easy to cause battery damage or safety problems.

[0025] Referring to FIG. 1, an embodiment of the present invention provides a power supply circuit 100. The power supply circuit 100 is used to supply power to a management unit 300 of a battery 200. The battery 200 is connected to an external circuit 500 by a safety protection switch 400. The power supply circuit 100 includes a voltage conversion circuit 110, a first line 120, and a second line 130. The voltage conversion circuit 110 is connected to both ends of the second line 130 and the safety protection switch 400 by the first line 120, respectively, and the voltage conversion circuit 110 is used to convert the output voltage of the battery 200 to the operating voltage of the management unit 300 through the first line 120 to supply power to the management unit 300 when the safety protection switch 400 is closed. The second line 130 includes a first switch 132, and the first switch 132 is closed when the safety protection switch 400 is disconnected, and the voltage conversion circuit 110 is used to supply power to the management unit 300 through the second line 130.

[0026] Specifically, the power supply circuit 100 has two power supply circuits. In one power supply circuit, the battery 200 reaches the voltage conversion circuit 110 via the safety protection switch 400 and the first line 120, and the voltage conversion circuit 110 converts the output voltage of the battery 200 to the operating voltage of the management unit 300 and supplies power to the management unit 300. In the other power supply circuit, the battery 200 reaches the voltage conversion circuit 110 via the second line 130, and the voltage conversion circuit 110 converts the output voltage of the battery 200 to the operating voltage of the management unit 300 and supplies power to the management unit 300.

[0027] The safety switch 400 is used to control the on / off of the battery 200 and the external circuit 500, and the battery 200 exchanges power with the safety switch 400 and the external circuit 500. When the safety switch 400 is closed, the battery 200 can be discharged to the external circuit 500, and the external circuit 500 can also be charged to the battery 200.

[0028] The safety protection switch 400 may be a micro circuit breaker (MCB), and the MCB may be manually disconnected or disconnected due to a fault. For example, when the battery 200 is connected to the external circuit 500, if the input or output current of the battery 200 is relatively large, the MCB will be disconnected due to an overcurrent fault.

[0029] When the safety protection switch 400 is disconnected, the voltage of the battery 200 cannot be connected to the voltage conversion circuit 110 via the first line 120. At this time, the first switch 132 is closed, and the voltage of the battery 200 can be connected to the voltage conversion circuit 110 via the second line 130, thereby realizing power supply to the management unit 300 and allowing the management unit 300 to operate normally. The first switch 132 is a manually controlled button switch, and when the safety protection switch 400 is disconnected, the first switch 132 can be manually controlled to be closed, allowing the management unit 300 to operate normally.

[0030] 2 , the BAT+ terminal can be used to connect to the positive pole of the battery 200, and the BAT- terminal can be used to connect to the negative pole of the battery 200. The PCS+ can be used to connect to the positive pole of the external circuit 500, and the PCS- can be used to connect to the negative pole of the external circuit 500. The B+ terminal can be used to connect to the positive pole of the voltage conversion circuit 110, and the B- terminal can be used to connect to the negative pole of the voltage conversion circuit 110.

[0031] The safety protection switch 400 may include a switch S1, and the first switch 132 may include a switch S2. The first line 120 may be a connection line between the third node N3 and the B-end, and the second line 130 may be a connection line between the fourth node N4 and the B-end. The BAT+ end may be connected to the B+ end by the first node N1, and the BAT- end may be connected to the B-end by the first line 120 or the second line 130.

[0032] When the switch S1 is closed, the BAT- terminal can be connected to the B- terminal by the third node N3, that is, the BAT- terminal can be connected to the B- terminal by the first line 120. At the same time, the BAT+ terminal is connected to the B+ terminal by the first node N1, and at this time, the output voltage of the battery 200 is applied to the voltage conversion circuit 110. The voltage conversion circuit 110 can convert the output voltage of the battery 200 into the operating voltage of the management unit 300 to supply power to the management unit 300.

[0033] 3, when the switch S1 is disconnected, the connection between the BAT+ terminal and the third node N3 is cut off, and the BAT- terminal cannot be connected to the B- terminal by the third node N3, that is, the BAT+ terminal cannot be connected to the B- terminal by the first line 120. At this time, by controlling the closing of the switch S2, the BAT- terminal can be connected to the B- terminal by the fourth node N4, that is, the BAT- terminal can be connected to the B- terminal by the second line 130. At the same time, the BAT+ terminal is connected to the B+ terminal by the first node N1, and at this time, the output voltage of the battery 200 is applied to the voltage conversion circuit 110. The voltage conversion circuit 110 can convert the output voltage of the battery 200 into the operating voltage of the management unit 300 to supply power to the management unit 300.

[0034] In this way, the battery 200 can be connected to the voltage conversion circuit 110 by two power supply circuits. When the safety protection switch 400 is disconnected, the output voltage of the battery 200 may be further connected to the voltage conversion circuit 110 by the first switch 132, so that the voltage conversion circuit 110 supplies power to the management unit 300. The management unit 300 can still operate normally and play the role of monitoring the battery 200, so as to prevent the management unit 300 from being unable to monitor the battery 200 in the event of a failure or safety risk of the battery 200, which is likely to cause damage to the battery 200 or safety problems.

[0035] 4, in some embodiments, the management unit 300 is used to detect the operating state of the battery 200. When the management unit 300 detects that the operating state of the battery 200 is abnormal, the management unit 300 controls the disconnection of the first switch 132, thereby disconnecting the connection between the voltage conversion circuit 110 and the battery 200.

[0036] Specifically, the management unit 300 can measure parameters such as the voltage, current, and temperature of the battery 200, and determine the operating state of the battery 200 based on the measured values. If the operating state of the battery 200 is abnormal, the management unit 300 can stop the operation of the battery 200 to protect the battery 200. After the fault is removed, the management unit 300 controls the operation of the battery 200.

[0037] When the battery 200 stops working, the battery 200 simultaneously cuts off the discharge path, and the output voltage of the battery 200 no longer supplies power to the management unit 300 of the battery 200. At this time, the safety protection switch 100 is in a cut-off state, that is, the switch S1 is in a cut-off state. At this time, if the switch S2 is controlled to be cut off, the voltage conversion circuit 110 cannot be connected to the battery 200 by the second line 130. By cutting off the connection between the voltage conversion circuit 110 and the battery 200, the power supply to the management unit 300 of the battery 200 is stopped.

[0038] When the power of the battery 200 is insufficient, the battery 200 also needs to cut off the discharge path. For example, when the charging device charges the battery 200, the battery 200 needs to cut off the discharge path, and the safety protection switch 100 is in the cut-off state. At this time, when the cut-off of the switch S2 is controlled, as described above, the connection between the voltage conversion circuit 110 and the battery 200 is cut off, thereby stopping the power supply from the battery 200 to the management unit 300.

[0039] In this way, when the operation of the battery 200 is abnormal, the battery 200 needs to cut off the discharge path. At this time, the management unit 300 controls the first switch 132 to be cut off, and the power supply to the management unit 300 of the battery 200 is stopped.

[0040] Referring to FIG. 5, in some embodiments, the first switch 132 is a manual switch.

[0041] Specifically, the first switch 132 may include the switch S2 in FIG. 5, and the switch S2 may be a manual switch. The user can manually disconnect the first switch 132 according to the actual situation. For example, when the management unit detects that the working state of the battery is abnormal, the management unit will send a corresponding alarm notification signal to notify the user. At this time, the safety protection switch 100 is in a disconnected state, that is, the switch S1 is in a disconnected state.

[0042] The user can control the disconnection of switch S2 to cut off the discharge path to the management unit of battery 200, and the output voltage of battery 200 will no longer supply power to management unit 300 of battery 200. At this time, by controlling the disconnection of switch S2, the connection between the BAT- terminal and the B- terminal is cut off. At this time, the connection between voltage conversion circuit 110 and battery 200 is cut off, so that the power supply to management unit 300 of battery 200 is stopped.

[0043] When the management unit detects that the battery power is insufficient, it may issue a corresponding alarm notification signal to notify the user. The user can control the disconnection of the switch S2 to cut off the discharge path of the battery 200 to the management unit, and the output voltage of the battery 200 will not supply power to the management unit 300 of the battery 200.

[0044] Referring to FIG. 6 , in some embodiments, the first switch 132 includes a first end, a second end and a third end, the first end is connected to the first line 120, the second end is connected to the second line 130, and the third end is connected to the voltage conversion circuit 110, and the first switch 132 is used to selectably connect the first end and the third end, connect the second end and the third end, or disconnect the first end and the third end and disconnect the second end and the third end.

[0045] Specifically, the first switch 132 may include the switch S2 in Fig. 6. A first end of the switch S2 is connected to the third node N3, a second end of the switch S2 is connected to the fourth node N4, and a third end of the switch S2 is connected to the B-end.

[0046] If the first end is connected to the third end, the third node N3 can be connected to the B-end by a first line 120.

[0047] When the switch S1 is closed, the BAT- terminal can be connected to the third node N3, and is connected to the B- terminal by the third node N3 and the switch S3. At the same time, the BAT+ terminal is connected to the B+ terminal by the first node N1, and at this time, the output voltage of the battery 200 is applied to the voltage conversion circuit 110. The voltage conversion circuit 110 can convert the output voltage of the battery 200 into the operating voltage of the management unit 300 and supply power to the management unit 300.

[0048] When the switch S1 is disconnected, the BAT- terminal cannot be connected to the third node N3, and the connection between the BAT- terminal and the B- terminal is cut off. By cutting the connection between the voltage conversion circuit 110 and the battery 200, the power supply from the battery 200 to the management unit 300 is stopped.

[0049] Further, reference can be made to Fig. 7. When the second end is connected to the third end, the second node N2 can be connected to the B- end by the second line 130. The BAT- end can be connected to the B- end by the second node N2, and at the same time, the BAT+ end can be connected to the B+ end by the first node N1, and at this time, the output voltage of the battery 200 is applied to the voltage conversion circuit 110. The voltage conversion circuit 110 can convert the output voltage of the battery 200 into the operating voltage of the management unit 300 to supply power to the management unit 300.

[0050] Further, refer to Fig. 8. When the first end and the third end are disconnected and the second end and the third end are disconnected, the B-end cannot be connected to the BAT-end by the first line 120 and the second line 130, and the connection between the BAT-end and the B-end is cut off. By cutting the connection between the voltage conversion circuit 110 and the battery 200, the power supply to the management unit 300 of the battery 200 is stopped.

[0051] Referring to FIG. 8, in some embodiments, the management unit 300 detects the operating status of the battery 200, and if it detects that the operating status of the battery 200 is abnormal, disconnects the third end from the first end and the second end.

[0052] Specifically, the management unit 300 can control the connection state of the switch S3. When the management unit 300 detects that the operating state of the battery 200 is abnormal, the battery 200 cuts off the charge / discharge path and cuts off the connection with the external circuit 500. At this time, the first end and the third end are cut off, and the second end and the third end are cut off, the B-end cannot be connected to the BAT-end by the first line 120 and the second line 130, and the connection between the BAT-end and the B-end is cut off. By cutting off the connection between the voltage conversion circuit 110 and the battery 200, the power supply to the management unit 300 of the battery 200 is stopped.

[0053] Referring to FIG. 9, in some embodiments, the first switch 132 is a single-pole, double-throw switch.

[0054] Specifically, the switch S2 may be a manual single-pole double-throw switch, and the user can selectably connect the first end and the third end, connect the second end and the third end, or disconnect the first end and the third end, and disconnect the second end and the third end according to actual needs.

[0055] When the second terminal is connected to the third terminal, as described above, the voltage conversion circuit 110 can convert the output voltage of the battery 200 into the operating voltage of the management unit 300 and supply power to the management unit 300.

[0056] When the first end and the third end are disconnected and the second end and the third end are disconnected, as described above, the connection between the voltage conversion circuit 110 and the battery 200 is cut off, thereby stopping the power supply to the management unit 300 of the battery 200.

[0057] 10, in some embodiments, the power supply circuit 100 further includes a third line 140. The battery 200 is connected to the second line 130 by the third line 140. The third line 140 includes a second switch 142, and when the second switch 142 is disconnected, the connection between the battery 200 and the second line 130 is disconnected.

[0058] When the second switch 142 is disconnected, the connection between the battery 200 and the second line 130 is cut off, and the voltage conversion circuit 110 cannot supply power to the management unit 300 via the second line 130.

[0059] Specifically, the third line 140 may be a connection line between the second node N2 and the fourth node N4, and the second switch 142 may include a switch S3.

[0060] When the switch S3 is disconnected, the connection between the second node N2 and the fourth node N4 is cut off, and the BAT- terminal cannot be connected to the fourth node N4 by the second node N2. Furthermore, the BAT- terminal cannot be connected to the B- terminal by the second node N2, the fourth node N4 and the switch S2, that is, the BAT- terminal cannot be connected to the B- terminal by the third line 140 and the second line 130.

[0061] As described above, when switch S1 is disconnected, the BAT- terminal cannot be connected to the B- terminal by the first line 120. Therefore, when switches S1 and S3 are disconnected at the same time, the BAT- terminal cannot be connected to the B- terminal by the first line 120, and the BAT- terminal cannot be connected to the B- terminal by the second line 130. By disconnecting the connection between the voltage conversion circuit 110 and the battery 200, the power supply to the management unit 300 of the battery 200 is stopped.

[0062] 11, in some embodiments, the power supply circuit further includes a fourth line 150. The fourth line 150 connects to the first line 120 and the third line 140, and when the second switch 142 is closed, the battery 200 is in communication with the voltage conversion circuit 110 through the third line 140, the fourth line 150 and the first line 120.

[0063] Specifically, the fourth line 150 may be a connection line between a fourth node N4 and a fifth node N5. The fourth line 150 is connected to the first line 120 by the fifth node N5, and the fourth line 150 is connected to the third line 140 by the fourth node N4.

[0064] The fourth node N4 is connected to the fifth node N5, and the fifth node N5 is connected to the BAT- terminal. Furthermore, the fourth node N4 is connected to the B- terminal. When the switch S3 is closed, the BAT- terminal can be connected to the fourth node N4 by the second node N2, and the fourth node N4 is connected to the B- terminal, so that the BAT- terminal can be connected to the B- terminal by the fourth node N4. At this time, the battery 200 is communicated with the voltage conversion circuit 110, and the voltage conversion circuit 110 can convert the output voltage of the battery 200 into the operating voltage of the management unit 300 to supply power to the management unit 300.

[0065] Referring to FIG. 10 , in some embodiments, the second switch 142 includes a fourth end, a fifth end, and a sixth end, where the fourth end is connected to the battery, the fifth end is floating, and the sixth end is connected to the second line, and the second switch 142 selectably connects the fourth end and the sixth end, connects the fifth end and the sixth end, or disconnects the fourth end and the sixth end and disconnects the fifth end and the sixth end.

[0066] Specifically, the second switch 142 may include a switch S3, where a fourth end of the switch S3 is connected to the second node N2, a fifth end of the switch S3 is floating, and a sixth end of the switch S3 is connected to the fourth node N4.

[0067] When the fourth end and the sixth end are disconnected, the connection between the second node N2 and the fourth node N4 is disconnected, and the BAT- end cannot be connected to the fourth node N4 by the second node N2. Furthermore, the BAT- end cannot be connected to the B- end by the second node N2, the fourth node N4 and the switch S2, that is, the BAT- end cannot be connected to the B- end by the third line 140 and the second line 130. By disconnecting the connection between the voltage conversion circuit 110 and the battery 200, the supply of power from the battery 200 to the management unit 300 is stopped.

[0068] Further, reference can be made to FIG. 12. When the fourth end and the sixth end are communicated, the second node N2 can be connected to the fourth node N4 by the second line 142. When the switch S2 is closed, the fourth node N4 is connected to the B-end, and the BAT-end can be connected to the B-end by the second node N2 and the fourth node N4. At this time, the battery 200 is communicated to the voltage conversion circuit 110, and the voltage conversion circuit 110 can convert the output voltage of the battery 200 into the operating voltage of the management unit 300 to supply power to the management unit 300.

[0069] Referring to FIG. 12, in some embodiments, the second switch 142 is a single-pole, double-throw switch.

[0070] Specifically, the second switch 142 may be a manual single-pole double-throw switch, and the user can selectably connect the fourth end and the sixth end, connect the fifth end and the sixth end, or disconnect the fourth end and the sixth end, and disconnect the fifth end and the sixth end according to actual needs.

[0071] When the fourth terminal is connected to the sixth terminal and the switch S2 is closed, as described above, the voltage conversion circuit 110 can convert the output voltage of the battery 200 into the operating voltage of the management unit 300 to power the management unit 300.

[0072] When the fourth terminal and the sixth terminal are disconnected and the switch S1 is turned off, as described above, the connection between the voltage conversion circuit 110 and the battery 200 is cut off, thereby stopping the power supply from the battery 200 to the management unit 300.

[0073] Referring to FIG. 13, in some embodiments, the external circuit 500 includes an energy storage current transformer 510 and an external power source 520, and when the safety protection switch 400 is closed, the external power source 520 charges the battery via the energy storage current transformer 510, and the voltage conversion circuit 110 is used to convert the output voltage of the energy storage current transformer 510 to the operating voltage of the management unit 300 via the first line 120 to power the management unit 300 when the safety protection switch 400 is closed.

[0074] Specifically, when the battery 200 is running low on power, the energy storage current transformer 510 can power the battery 200 by inputting the voltage of the external power source 520. The battery can power a load connected to the external circuit 500 by the energy storage current transformer 510.

[0075] The energy storage current transformer 510 can power the management unit 300 by inputting the voltage of an external power source 520. When the battery 200 is running out of power, the external power source 520 can power the battery 200.

[0076] When the external power source 520 charges the battery 200 through the energy storage current transformer 510, the management unit 300 of the battery 200 needs to monitor the charging process of the battery 200. Because the power of the battery 200 is insufficient, the battery 200 cannot output a voltage to supply power to the management unit 300 of the battery 200. At this time, the energy storage current transformer 510 can supply power to the management unit 300 of the battery 200 by inputting the voltage of the external power source 520, and the management unit 300 can monitor the charging operation of the battery 200.

[0077] Referring to FIG. 14, in some embodiments, the power supply circuit 100 further includes a fifth circuit 160, which is connected between the energy storage current transformer and the first circuit 120, and the fifth circuit 160 includes a third switch 152, which is used to close when the safety protection switch 400 is closed.

[0078] Specifically, the third switch 152 may be switch S4, and the circuit from switch S1 to PCS- is the fifth circuit 160. PCS+ can be used to connect to the positive terminal of the energy storage current transformer 510, and PCS- can be used to connect to the negative terminal of the energy storage current transformer 510.

[0079] BAT+ is connected to PCS+ by switch S1, and BAT- is connected to PCS- by switch S1 and switch S4. When switch S1 is closed, switch S4 is closed at the same time, so that BAT+ is connected to PCS+ and BAT- is connected to PCS-. At this time, the energy storage current transformer 510 is connected to the battery 200, and the external circuit 500 can power the battery 200 through the energy storage current transformer 510, or the battery 200 can power the external circuit 500 through the energy storage current transformer 510.

[0080] 14 , in some embodiments, the power supply circuit 100 further includes a sixth circuit 170. The positive terminal of the battery 200 is connected to the voltage conversion circuit 110 by the sixth circuit 170, the negative terminal of the battery 200 is connected to the voltage conversion circuit 110 by the second circuit 130 and the third circuit 140, and the negative terminal of the battery 200 is further connected to the voltage conversion circuit 110 by the first circuit 120.

[0081] Specifically, the connection line between the first node N1 and the B+ end may be the sixth connection line. The B+ end may be directly connected to the BAT+ by the sixth line 170.

[0082] 15, in some embodiments, the power supply circuit 100 includes an internal power supply 180 that is connected to the management unit 300 and is used to power the management unit 300.

[0083] Specifically, the management unit 300 of the battery 200 has a corresponding internal power source 180, and when the power of the battery 200 is insufficient, the internal power source 180 can supply power to the management unit 300. When the charging device charges the battery 200, the power of the battery 200 is insufficient and the management unit 300 cannot be supplied with power, and the internal power source 180 can supply power to the management unit 300. The internal power source 180 supplies power to the management unit 300, so that the management unit 300 can operate normally and monitor the operating status of the charging of the battery 200.

[0084] An embodiment of the present invention provides a battery monitoring circuit including the power supply circuit 100 and the management unit 300 described in any of the above embodiments.

[0085] Specifically, while the battery 200 is operating, the power supply circuit 100 maintains power supply to the management unit 300, allowing the management unit to constantly monitor the operating status of the battery 200. In the event of a malfunction or safety risk in the battery 200, protection can be activated in a timely manner, thereby improving the safety of the battery 200.

[0086] For the embodiments of the power supply circuit 100 and the management unit 300, reference can be made to the above embodiments, and the beneficial effects of the battery monitoring circuit include all the beneficial effects of the power supply circuit 100 and the management unit 300, which will not be described here one by one.

[0087] Referring to FIG. 16, an embodiment of the present invention provides an energy storage device 1000 including a battery monitoring circuit and a battery 200 as described in any of the above embodiments.

[0088] For the battery monitoring circuit and the battery 200, reference can be made to the above embodiments, and the beneficial effects of the energy storage device 1000 have all the beneficial effects of the battery monitoring circuit, which will not be described here one by one.

[0089] Regarding the power supply circuit 100, the battery monitoring circuit, and the energy storage device 1000 according to the embodiment of the present invention, the power supply circuit 100 is used to control the battery 200 to supply power to the management unit 300 of the battery 200. In one power supply circuit, the voltage of the battery 200 reaches the voltage conversion circuit 110 via the safety protection switch 400 and the first line 120, and the voltage conversion circuit 110 converts the voltage of the battery 200 to the operating voltage of the management unit 300 and supplies power to the management unit 300. In the other power supply circuit, the voltage of the battery 200 reaches the voltage conversion circuit 110 via the second line 130, and the voltage conversion circuit 110 converts the voltage of the battery 200 to the operating voltage of the management unit 300 and supplies power to the management unit 300. When the safety protection switch 400 is disconnected, the battery 200 cannot be connected to the voltage conversion circuit 110 by the first line 120, at this time, the first switch 132 is closed, and the battery 200 can be connected to the voltage conversion circuit 110 by the second line 130, thus the voltage of the battery 200 reaches the voltage conversion circuit 110 through the second line 130, and the voltage conversion circuit 110 can convert the voltage of the battery 200 into the operating voltage of the management unit 300 to supply power to the management unit 300, so that the management unit 300 can operate normally. In this way, when the battery 200 fails or there is a safety risk, the management unit 300 cannot monitor the battery 200, which can prevent the battery 200 from being easily damaged or causing a safety problem.

[0090] In the description of this specification, the reference terms such as "one embodiment", "some embodiments", "exemplary embodiments", "examples", "specific examples", or "some examples" refer to specific features, structures, materials, or characteristics described in combination with the examples or examples that are included in at least one embodiment or example of the present invention. In this specification, the exemplary descriptions of the above terms do not necessarily refer to the same embodiment or example. It should be noted that, if not in conflict with each other, a person skilled in the art can combine and combine different embodiments or examples and features of different embodiments or examples described in this specification.

[0091] It should be noted that the term "connected" should be understood in a broad sense, and may refer to, for example, a fixed connection, a detachable connection, or an integral connection, a direct connection, or an indirect connection through an intermediate medium, or an internal communication between two elements. Those skilled in the art can understand the specific meanings of these terms in the present application according to specific circumstances.

[0092] It should be noted that the terms "first", "second" and the like are for explanatory purposes only and cannot be considered as indicating or implying relative importance or the number of technical features. Thus, a feature defined as "first" or "second" can be expressly or implying that it includes one or more of the feature, and in the description of the present invention, unless otherwise clearly and specifically limited, the concept of "plurality" is at least two, e.g., two or three.

[0093] Any process or method description in a flowchart or otherwise described herein can be understood as representing one or more modules, fragments, or portions that contain executable instruction code for implementing custom logic functions or process steps, and the scope of the preferred embodiments of the present application includes other implementations that may not necessarily perform the functions in the order shown or discussed, including performing functions essentially simultaneously or in reverse order based on the functionality involved, as should be understood by one of ordinary skill in the art.

[0094] Although the embodiments of the present invention have been presented and described, the above embodiments are illustrative and should not be construed as limiting the present invention. It will be understood by those skilled in the art that various changes, modifications, substitutions and variations are possible in the above embodiments within the scope of the present invention.

Claims

1. A power supply circuit for supplying power to a management unit of a battery, comprising: The battery is connected to an external circuit by a safety switch; the power supply circuit includes a voltage conversion circuit, a first line and a second line, the voltage conversion circuit is connected to both ends of the safety protection switch via the first line and the second line, respectively, and the voltage conversion circuit is used to convert the output voltage of the battery into an operating voltage of the management unit to supply power to the management unit; The second circuit includes a first switch, and when the safety protection switch is disconnected, the first switch closes, causing the battery to power the management unit via the second circuit through the voltage conversion circuit.

2. 2. The power supply circuit according to claim 1, wherein the management unit is used to control the disconnection of the first switch when it detects that the operating state of the battery is abnormal.

3. 2. The power supply circuit of claim 1, wherein the first switch is a manual switch that allows a user to manually disconnect the power supply circuit.

4. 2. The power supply circuit according to claim 1, wherein the first switch has a first end, a second end and a third end, the first end being connected to the battery, the second end being connected to the first line, and the third end being connected to the voltage conversion circuit, and the first switch is selectable to connect the first end and the third end, connect the second end and the third end, or disconnect the first end and the third end, and disconnect the second end and the third end.

5. 5. The power supply circuit according to claim 4, wherein the management unit is used to disconnect the third end from the first end and the second end when the management unit detects that the operating state of the battery is abnormal.

6. 5. The power supply circuit of claim 4, wherein the first switch is a single-pole, double-throw switch.

7. 2. The power supply circuit according to claim 1, further comprising a third line, the battery being connected to the second line by the third line, the third line comprising a second switch, and when the second switch is disconnected, the connection between the battery and the second line is disconnected.

8. 8. The power supply circuit according to claim 7, further comprising a fourth line, the fourth line being connected to the first line and the third line, and when the second switch is closed, the battery is connected to the voltage conversion circuit by the third line, the fourth line and the first line.

9. 8. The power supply circuit of claim 7, wherein the second switch has a fourth end, a fifth end and a sixth end, the fourth end being connected to the battery, the fifth end being floating, and the sixth end being connected to the second line, and the second switch selectably connects the fourth end to the sixth end, connects the fifth end to the sixth end, or disconnects the fourth end to the sixth end and disconnects the fifth end to the sixth end.

10. 10. The power supply circuit of claim 9, wherein the second switch is a single-pole, double-throw switch.

11. 2. The power supply circuit according to claim 1, wherein the external circuit comprises an energy storage current transformer and an external power source, and when the safety protection switch is closed, the external power source charges the battery through the energy storage current transformer, and when the safety protection switch is closed, the voltage conversion circuit is used to convert the output voltage of the energy storage current transformer through the first line to an operating voltage of the management unit to power the management unit.

12. 2. The power supply circuit of claim 1, wherein the power supply circuit comprises a fifth line, the fifth line being connected between the energy storage current transformer and the first line, and the fifth line comprises a third switch, the third switch being used to close when the first switch is closed.

13. 2. The power supply circuit according to claim 1, wherein the power supply circuit comprises an internal power supply, the internal power supply being connected to the management unit and used to power the management unit.

14. A battery monitoring circuit comprising the power supply circuit and a management unit according to any one of claims 1 to 13.

15. An energy storage device comprising the battery monitoring circuit of claim 14 and a battery.

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