High-voltage box power supply system

Abstract

The utility model relates to a high-voltage box power supply system, which comprises an alternating current input end, a battery cluster, a first switch unit, a second switch unit, a first power supply conversion unit, a second power supply conversion unit and a power supply redundancy unit, the first power conversion unit is electrically connected to the first switch unit, the second power conversion unit is electrically connected to the second switch unit, and the power redundancy unit is electrically connected to the battery management unit and the battery cluster management unit in the high-voltage box. The alternating current input end, the first switch unit, the first power conversion unit and the power redundancy unit form a first power supply path, the battery cluster, the second switch unit, the second power conversion unit and the power redundancy unit form a second power supply path, and the first power supply path and the second power supply path are arranged in parallel. The reliability of the high-voltage box power supply system can be improved, the space and the cost are saved, and the heat dissipation performance of the high-voltage box is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a high-voltage box power supply system. Background Art

[0002] In related technologies, a battery pack consists of several cells connected in series. These cells are then connected to a high-voltage box to form a battery cluster. Outdoor cabinets include the battery cluster, a liquid cooling system, and a fire protection system. However, due to limited space inside outdoor cabinets, a bulky uninterruptible power supply (UPS) cannot be installed, leading to numerous issues with the high-voltage box's power supply.

[0003] The high-voltage box is typically powered by an external power supply within the outdoor cabinet. If the external power supply fails, the high-voltage box loses power as well. Both the master controller within the high-voltage box and the slave controller within the battery pack will cease to function, making it impossible to collect temperature and voltage data within the battery pack. Communication and data transmission are also impossible, making it impossible to obtain data about the battery cells within the battery pack. This results in poor power supply reliability for the high-voltage box.

[0004] To this end, the related art also provides a technical solution for connecting two power supplies in parallel. However, the power supply with a higher output voltage will charge the power supply with a lower output voltage, forming a circulating current. The power supply with a lower output voltage may overheat or even burn out. If two power supplies are connected to diodes separately, the unidirectional conduction characteristics of the diodes solve the circulating current problem, but there are problems such as high power consumption, severe heat generation, the need for a heat sink, and a large footprint. In addition, since the circuit usually flows with high current, the diode is in forward conduction mode most of the time, and the power consumption caused by its voltage drop cannot be ignored. The Schottky diode with the lowest voltage drop has a voltage of 0.45V. At high currents, such as 12A, the power consumption is 5W. The high-voltage box has an IP56 protection level and contains high-power devices such as fuses and pre-charge resistors. Therefore, special attention must be paid to heat dissipation. Utility Model Content

[0005] In view of this, the utility model proposes a high-voltage box power supply system, which can seamlessly switch to battery cluster power supply after the external AC mains power is cut off, so that the battery management unit and battery cluster management unit of the high-voltage box can continue to work, thereby improving the reliability of the high-voltage box power supply system. There is no need to set up an uninterruptible power supply, saving space and cost, and improving the heat dissipation performance of the high-voltage box.

[0006] According to one aspect of the present invention, a high-voltage box power supply system is provided, comprising: an AC input terminal located on an outdoor cabinet for inputting AC power from outside the outdoor cabinet; a battery cluster comprising a plurality of battery packs, each of which comprises a plurality of battery cells; a first switch unit electrically connected to the AC input terminal; a second switch unit electrically connected to the battery cluster; a first power conversion unit electrically connected to the first switch unit; a second power conversion unit electrically connected to the second switch unit; and a power redundancy unit electrically connected to a battery management unit and a battery cluster management unit in the high-voltage box; wherein the AC input terminal, the first switch unit, the first power conversion unit, and the power redundancy unit constitute a first power supply path for supplying power to the battery management unit and the battery cluster management unit of the high-voltage box using the AC input terminal; the battery cluster, the second switch unit, the second power conversion unit, and the power redundancy unit constitute a second power supply path for supplying power to the battery management unit and the battery cluster management unit of the high-voltage box using the battery cluster, the first time period and the second time period are connected in time scale, and the first power supply path and the second power supply path are arranged in parallel.

[0007] By using the AC input end and the battery cluster as dual power sources to power the battery management unit and the battery cluster management unit of the high-voltage box, and based on the first switch unit, the second switch unit and the power redundancy unit, the AC input end and the battery cluster are used in turn to power the battery management unit and the battery cluster management unit of the high-voltage box. According to various aspects of the utility model, after the external AC mains power is cut off, it is possible to seamlessly switch to the battery cluster power supply, so that the battery management unit and the battery cluster management unit of the high-voltage box can continue to work, thereby improving the reliability of the high-voltage box power supply system, and eliminating the need to set up an uninterruptible power supply, saving space and cost, and improving the heat dissipation performance of the high-voltage box. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] The technical solutions and other beneficial effects of the present invention will be made apparent by describing in detail the specific embodiments of the present invention in conjunction with the accompanying drawings.

[0009] Figure 1 A first block diagram of a high-voltage box power supply system according to an embodiment of the present utility model is shown.

[0010] Figure 2 A circuit diagram of a high-voltage box power supply system according to an embodiment of the present invention is shown.

[0011] Figure 3 A second block diagram of the high-voltage box power supply system according to an embodiment of the present utility model is shown. DETAILED DESCRIPTION

[0012] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making any creative efforts shall fall within the scope of protection of the present invention.

[0013] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like, indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0014] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections, or mutual communication; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0015] The disclosure below provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplicity and clarity, and does not in itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides examples of various specific processes and materials, but a person of ordinary skill in the art will be aware of the application of other processes and / or the use of other materials. In some instances, methods, means, components and circuits well known to those skilled in the art are not described in detail in order to highlight the subject matter of the present invention.

[0016] Figure 1 The first block diagram of the high voltage box power supply system of the utility model embodiment is shown. Figure 1 As shown, the high-voltage box power supply system of the present invention includes an AC input terminal 101, a battery cluster 102, a first switch unit 201, a second switch unit 202, a first power conversion unit 301, a second power conversion unit 302 and a power redundancy unit 400. The high-voltage box power supply system is used to supply power to a battery management unit (BMU) 501 and a battery cluster management unit (BCMU) 502 in the high-voltage box, so that the battery management unit 501 and the battery cluster management unit 502 of the high-voltage box can maintain normal operation when the external power supply is interrupted.

[0017] In one embodiment, the high-voltage box can be located in an outdoor cabinet and can include multiple battery clusters 102. Each battery cluster 102 includes multiple battery packs, each including multiple battery cells. It is understood that the number and arrangement of the multiple battery cells can be set as needed and are not limited by the present invention.

[0018] Figure 2 The following is a circuit diagram of the high voltage box power supply system of the utility model embodiment. Figure 2 Describe in detail the various parts of the high-voltage box power supply system.

[0019] In one embodiment, the battery management unit 501 includes a first positive input terminal and a first negative input terminal, which are used to receive a DC high-voltage box supply voltage to enable the normal operation of the battery management unit 501. The battery management unit 501 is a primary master control unit and can be used to receive collected battery data such as the voltage and temperature of each battery cell.

[0020] In one embodiment, the positive electrode of the battery cluster may be Figure 2 B+, the negative electrode of the battery cluster can be Figure 2 The battery cluster management unit 502 includes a second positive input and a second negative input, each of which is used to receive a DC high-voltage box supply voltage to enable the battery cluster management unit 502 to operate normally. The second positive input can be electrically connected to the first positive input, and the second negative input can be electrically connected to the first negative input. The battery cluster management unit 502 is a secondary master control unit that can be used to receive battery data such as the voltage and temperature of each battery cell uploaded by the battery management system via a communication channel. Optionally, the communication channel can be a Controller Area Network (CAN) bus.

[0021] In one embodiment, the AC input terminal 101 may be located on the outdoor cabinet, and is used to input mains power from outside the outdoor cabinet. The mains power may be 220V AC power.

[0022] In one embodiment, the first switch unit 201 includes a first circuit breaker QF2 , a first end of the first circuit breaker QF2 is electrically connected to the AC input terminal 101 , and a second end of the first circuit breaker QF2 is electrically connected to the first power conversion unit 301 .

[0023] When the AC input terminal 101 needs to be used to supply power to the battery management unit 501 and the battery cluster management unit 502 of the high-voltage box, the first circuit breaker QF2 is in the on state; when the battery cluster 102 needs to be used to supply power to the battery management unit 501 and the battery cluster management unit 502 of the high-voltage box, the first circuit breaker QF2 is in the off state.

[0024] In one embodiment, the second switch unit 202 includes a second circuit breaker QF3 , a first terminal of the second circuit breaker QF3 is electrically connected to the battery cluster 102 , and a second terminal of the second circuit breaker QF3 is electrically connected to the second power conversion unit 302 .

[0025] When the AC input terminal 101 needs to be used to supply power to the battery management unit 501 and the battery cluster management unit 502 of the high-voltage box, the second circuit breaker QF3 is in the disconnected state; when the battery cluster 102 needs to be used to supply power to the battery management unit 501 and the battery cluster management unit 502 of the high-voltage box, the second circuit breaker QF3 is in the connected state.

[0026] In one embodiment, the first power conversion unit 301 includes an AC / DC conversion module (i.e., AC / DC). The AC / DC conversion module PS2 is configured to convert the AC mains power input from the AC input terminal 101 into a DC high-voltage box supply voltage. Optionally, the high-voltage box supply voltage may be 24V DC.

[0027] The AC / DC conversion module PS2 includes a first positive output terminal and a first negative output terminal. The first positive output terminal is electrically connected to the power redundancy unit, and the first negative output terminal is electrically connected to the first negative output terminal of the battery management unit 501 and the second negative output terminal of the battery cluster management unit 502.

[0028] In one embodiment, the second power conversion unit 302 includes a direct current / direct current (DC / DC) conversion module. The DC / DC conversion module PS1 is configured to convert the power voltage of the battery cluster 102 into a high voltage box supply voltage.

[0029] The DC / DC conversion module PS1 includes a second positive output terminal and a second negative output terminal. The second positive output terminal is electrically connected to the power redundancy unit, and the second negative output terminal is electrically connected to the first negative output terminal of the battery management unit 501 and the second negative output terminal of the battery cluster management unit 502.

[0030] The power redundancy unit 400 is electrically connected to the battery management unit 501 and the battery cluster management unit 502 in the high-voltage box, and is configured to be turned on when the AC input terminal 101 is used to supply power to the battery management unit 501 and the battery cluster management unit 502 of the high-voltage box in a first time period, or when the battery cluster 102 is used to supply power to the battery management unit 501 and the battery cluster management unit 502 of the high-voltage box in a second time period.

[0031] The AC input end 101, the first switch unit 201, the first power conversion unit 301, and the power redundancy unit 400 constitute a first power supply path, which is used to use the AC input end 101 to supply power to the battery management unit 501 and the battery cluster management unit 502 of the high-voltage box in a first time period; the battery cluster 102, the second switch unit 202, the second power conversion unit 302, and the power redundancy unit 400 constitute a second power supply path, which is used to use the battery cluster 102 to supply power to the battery management unit 501 and the battery cluster management unit 502 of the high-voltage box in a second time period. The first time period and the second time period are connected in time scale, and the first power supply path and the second power supply path are arranged in parallel.

[0032] In one embodiment, the power redundancy unit 400 includes a first transistor, wherein the gate of the first transistor is electrically connected to the first control terminal, one of the source and drain of the first transistor is electrically connected to the first power conversion unit 301, and the other of the source and drain of the first transistor is electrically connected to the battery management unit 501 and the battery cluster management unit 502. Specifically, one of the source and drain of the first transistor is electrically connected to the first positive output terminal of the first power conversion unit 301.

[0033] In one embodiment, the power redundancy unit 400 further includes a second transistor, wherein the gate of the second transistor is electrically connected to the second control terminal, one of the source and drain of the second transistor is electrically connected to the second power conversion unit 302, and the other of the source and drain of the second transistor is electrically connected to the battery management unit 501 and the battery cluster management unit 502. Specifically, one of the source and drain of the second transistor is electrically connected to the second positive output terminal of the second power conversion unit 302.

[0034] The first control terminal and the second control terminal may be the same control terminal or different control terminals. The first control terminal is used to control the on / off state of the first transistor, and the second control terminal is used to control the on / off state of the second transistor. The other of the source and drain of the first transistor and the other of the source and drain of the second transistor may be interconnected.

[0035] In one embodiment, the power redundancy unit 400 may further include a switch control chip, on which the first control terminal and the second control terminal are provided. To save costs, if there are surplus chip pins within the battery management system or the battery cluster 102 management system, the chip within the battery management system or the battery cluster 102 management system may be utilized to control the switching state of the first transistor and the switching state of the second transistor. In this case, the first control terminal and the second control terminal may be provided on the chip within the battery management system or the chip within the battery cluster 102 management system.

[0036] When the AC input terminal 101 is needed to supply power to the battery management unit 501 and the battery cluster management unit 502 of the high-voltage box, the switch control chip controls the first transistor to be in the on state and the second transistor to be in the off state to avoid reverse power supply to the second power conversion unit 302; when the battery cluster 102 is needed to supply power to the battery management unit 501 and the battery cluster management unit 502 of the high-voltage box, the switch control chip controls the first transistor to be in the off state and the second transistor to be in the on state to ensure uninterrupted power supply to the battery management unit 501 and the battery cluster management unit 502 of the high-voltage box.

[0037] Figure 3 The second block diagram of the high voltage box power supply system of the utility model embodiment is shown. Figure 3 As shown, the high-voltage box power supply system of the present invention also includes a third switch unit, which is electrically connected to the second switch unit 202 and the battery cluster management unit 502. The third switch unit is used to cut off the external power supply of the battery cluster 102 when the cell voltage of the battery cluster 102 is less than a preset voltage threshold, so as to avoid excessive discharge of each cell of the battery cluster 102.

[0038] The third switch unit includes an intermediate relay KA1 . The battery cluster management unit 502 further includes a data output terminal. The intermediate relay KA1 is electrically connected to the second positive input terminal and the data output terminal.

[0039] The second circuit breaker QF3 includes a shunt module electrically connected to the intermediate relay KA1 and the second negative input terminal. The shunt module utilizes an electromagnetic field generated by a coil to disconnect the circuit in which the second circuit breaker QF3 resides. Due to the shunt function, the embodiment of the present invention improves the response speed of the second circuit breaker QF3 and better prevents excessive discharge of the cells in the battery cluster 102.

[0040] When the cell voltage collected by the battery management system is less than a preset voltage threshold, for example, the voltage of a single cell is less than 2.5V, the battery management system can transmit the collected cell voltage to the battery cluster management unit 502 in the high-voltage box through CAN communication. The battery cluster management unit 502 controls the coil of the intermediate relay KA1 to be energized, and the normally open contact of the intermediate relay KA1 is closed, thereby energizing the shunt module of the second circuit breaker QF3. The second circuit breaker QF3 implements the disconnecting function, cutting off the operation of the second power conversion unit 302, and ultimately preventing the battery cells of the battery cluster 102 from discharging, thereby preventing the battery cells of the battery cluster 102 from being over-discharged and causing irreversible capacity decay.

[0041] See also Figure 2 The high-voltage box of the present invention may also include a shunt, a main negative fuse, a main positive fuse, a main negative contactor, a main positive contactor, a main circuit switch, and other components. These components may be provided for the charging and discharging functions of the battery cluster. It should be understood that the present invention is not limited to other circuits of the high-voltage box.

[0042] In summary, by using the AC input end and the battery cluster as dual power sources to power the battery management unit and the battery cluster management unit of the high-voltage box, and based on the first switch unit, the second switch unit and the power redundancy unit taking turns using the AC input end and the battery cluster to power the battery management unit and the battery cluster management unit of the high-voltage box, the utility model can seamlessly switch to battery cluster power supply after the external AC mains power is cut off, so that the battery management unit and the battery cluster management unit of the high-voltage box can continue to work, thereby improving the reliability of the high-voltage box power supply system, and there is no need to set up an uninterruptible power supply, saving space and cost, and improving the heat dissipation performance of the high-voltage box.

[0043] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0044] The above is a detailed introduction to the high-voltage box power supply system provided by the embodiments of the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the technical solutions and core ideas of the present invention. Ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high-voltage box power supply system, characterized in that: include: AC input terminal, located on the outdoor cabinet, is used to input AC power from outside the outdoor cabinet; A battery cluster, comprising a plurality of battery packs, each of which comprises a plurality of battery cells; A first switch unit, electrically connected to the AC input terminal; a second switch unit, electrically connected to the battery cluster; a first power conversion unit, electrically connected to the first switch unit; a second power conversion unit, electrically connected to the second switch unit; A power redundancy unit electrically connected to the battery management unit and the battery cluster management unit in the high-voltage box; Among them, the AC input end, the first switch unit, the first power conversion unit and the power redundancy unit constitute a first power supply path, which is used to use the AC input end to supply power to the battery management unit and the battery cluster management unit of the high-voltage box; the battery cluster, the second switch unit, the second power conversion unit and the power redundancy unit constitute a second power supply path, which is used to use the battery cluster to supply power to the battery management unit and the battery cluster management unit of the high-voltage box, and the first power supply path and the second power supply path are arranged in parallel.

2. The high-voltage box power supply system according to claim 1, characterized in that: The first switch unit includes: A first circuit breaker, wherein a first end of the first circuit breaker is electrically connected to the AC input end, and a second end of the first circuit breaker is electrically connected to the first power conversion unit.

3. The high-voltage box power supply system according to claim 1, characterized in that: The second switch unit includes: a second circuit breaker, wherein a first end of the second circuit breaker is electrically connected to the battery cluster, and a second end of the second circuit breaker is electrically connected to the second power conversion unit; The second circuit breaker includes a shunt module, and the shunt module is used to cut off the circuit where the second circuit breaker is located by utilizing the electromagnetic field generated by the coil.

4. The high-voltage box power supply system according to claim 3, characterized in that: The first power conversion unit includes: An AC / DC conversion module, configured to convert the AC mains power input from the AC input terminal into a DC high-voltage box supply voltage; The AC / DC conversion module includes a first positive output terminal and a first negative output terminal. The first positive output terminal is electrically connected to the power redundancy unit, and the first negative output terminal is electrically connected to the first negative output terminal of the battery management unit and the second negative output terminal of the battery cluster management unit.

5. The high-voltage box power supply system according to claim 4, characterized in that: The second power conversion unit includes: a DC / DC conversion module, configured to convert the power supply voltage of the battery cluster into a high-voltage box power supply voltage; The DC / DC conversion module includes a second positive output terminal and a second negative output terminal, the second positive output terminal is electrically connected to the power redundancy unit, and the second negative output terminal is electrically connected to the first negative output terminal of the battery management unit and the second negative output terminal of the battery cluster management unit.

6. The high-voltage box power supply system according to claim 5, characterized in that: The battery management unit includes a first positive input terminal and a first negative input terminal, the battery cluster management unit includes a second positive input terminal and a second negative input terminal, the second negative input terminal is electrically connected to the shunt module, and the power redundancy unit includes at least two transistors, wherein the first positive input terminal and the second positive input terminal are respectively electrically connected to different transistors of the power redundancy unit, and the first negative input terminal is electrically connected to the second negative input terminal.

7. The high-voltage box power supply system according to claim 6, characterized in that: The power redundancy unit comprises: a first transistor, wherein a gate of the first transistor is electrically connected to a first control terminal, one of a source and a drain of the first transistor is electrically connected to a first positive output terminal of the first power conversion unit, and the other of the source and the drain of the first transistor is electrically connected to the battery management unit and the battery cluster management unit.

8. The high-voltage box power supply system according to claim 6, characterized in that: The power redundancy unit further includes: a second transistor, wherein the gate of the second transistor is electrically connected to the second control terminal, one of the source and the drain of the second transistor is electrically connected to the second positive output terminal of the second power conversion unit, and the other of the source and the drain of the second transistor is electrically connected to the battery management unit and the battery cluster management unit.

9. The high-voltage box power supply system according to claim 6, characterized in that: The high-voltage box power supply system also includes: A third switch unit is electrically connected to the second switch unit and the battery cluster management unit, and is used to cut off the external power supply of the battery cluster when the cell voltage of the battery cluster is lower than a preset voltage threshold.

10. The high-voltage box power supply system according to claim 9, characterized in that: The third switch unit includes: An intermediate relay, the battery cluster management unit further includes a data output end, and the intermediate relay is electrically connected to the second positive input end, the shunt module and the data output end.

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