A power supply circuit of a high-voltage data center lithium battery management system

Abstract

The utility model relates to lithium battery management system power supply technical field especially relates to a kind of power supply circuit of high-voltage data center lithium battery management system, including ac input power supply circuit and battery input power supply circuit, ac input power supply circuit includes ac input end, AC / DC converter and first diode, and battery input power supply circuit includes battery voltage input end, DC / DC converter, first relay, second relay and second diode;The utility model makes on-off control switch satisfy high-voltage resistance requirement, reduces on-off control switch cost, and the on-off of two relays can be directly driven through control module, is convenient for control, and in the case where sticking occurs in any relay, lithium battery management system still can reliably shut down, guarantee the security when using;Two power supply circuits formed by ac input power supply circuit and battery input power supply circuit guarantee the reliability when using.

Description

Technical Field

[0001] This utility model relates to the field of power supply technology for lithium battery management systems, and in particular to a power supply circuit for a high-voltage data center lithium battery management system. Background Technology

[0002] In data centers where cost, reliability, and certification requirements are increasingly stringent, conventional lithium battery management systems (BMS) for lithium battery projects typically have two power supplies. One supply powers the DC / DC converter via the lithium battery system itself, which in turn powers the entire lithium battery system. The other supply powers the AC / DC converter via alternating current, which in turn powers the entire lithium battery system. Currently, in this power circuit where the lithium battery system itself powers the DC / DC converter, a miniature circuit breaker or a push-button switch-like device is usually added between the positive and negative terminals of the lithium battery system and the DC / DC input to control the on / off state of the DC / DC input. However, high-voltage miniature circuit breakers are almost never UL certified, and push-button switches and similar devices cannot meet the high-voltage resistance requirements.

[0003] Therefore, designing a power supply circuit in a high-voltage data center lithium battery management system that reduces the cost of on / off control switches while ensuring the safety of the lithium battery system, and achieves reliable DC power supply so that the system meets UL certification requirements, is a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a power supply circuit for a high-voltage data center lithium battery management system.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a power supply circuit for a high-voltage data center lithium battery management system, comprising an AC input power supply circuit and a battery input power supply circuit;

[0006] The AC input power supply circuit includes an AC input terminal, an AC / DC converter, and a first diode. The AC input terminal is connected to the input terminal of the AC / DC converter, and the anode of the first diode is connected to the positive output terminal of the AC / DC converter.

[0007] The battery input power supply circuit includes a battery voltage input terminal, a DC / DC converter, a first relay, a second relay, and a second diode. The battery voltage input terminal is connected to the input terminal of the DC / DC converter. The first relay is connected between the positive input terminal of the battery voltage input terminal and the positive input terminal of the DC / DC converter. The anode of the second diode is connected to the positive output terminal of the DC / DC converter. The second relay is connected between the positive output terminal of the DC / DC converter and the anode of the second diode.

[0008] Optionally, the first relay is a high-voltage, low-current relay, and the rated voltage of the first relay is not lower than the highest input voltage of the battery voltage input terminal.

[0009] Optionally, the rated voltage of the second relay is matched with the output voltage of the DC / DC converter.

[0010] Optionally, the control module is located outside the battery input power supply circuit, and the control module outputs drive signals to the first relay and the second relay.

[0011] Optionally, the control terminals of the first relay and the second relay are respectively provided with drive coils, which can receive drive signals; the drive coils control the first relay and the second relay to close when the drive signal is maintained, and control the first relay and the second relay to open when the drive signal is interrupted.

[0012] Optionally, the positive output terminal of the AC input power supply circuit is connected to the positive output terminal of the battery input power supply circuit and both are connected to the lithium battery management system, and the negative output terminal of the AC input power supply circuit is connected to the negative output terminal of the battery input power supply circuit and both are connected to the lithium battery management system.

[0013] Optionally, the voltage output to the lithium battery management system from both the AC input power supply circuit and the battery input power supply circuit is a 24V DC voltage.

[0014] The beneficial effects of this utility model are:

[0015] 1. This utility model uses a high-voltage low-current relay and a low-voltage medium-current relay at the input and output ends of the DC / DC converter to replace the traditional miniature circuit breaker, so that the on / off control switch meets the high voltage resistance requirement and reduces the cost of the on / off control switch. The on / off of the two relays can be directly driven by the control module, which is convenient for control. In addition, the lithium battery management system can still reliably shut down even if any relay sticks together, ensuring safety during use.

[0016] 2. This utility model outputs 24V DC voltage to the lithium battery management system through two power supply circuits formed by the AC input power supply circuit and the battery input power supply circuit. Even if the AC side loses power, the battery voltage input on the DC side can still keep the relays at both ends of the DC / DC converter closed, so that the battery input power supply circuit can normally supply power to the lithium battery management system, ensuring reliability during use. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 This is a schematic diagram of the circuit structure of this utility model.

[0019] In the diagram: 1. AC input power supply circuit, 2. Battery input power supply circuit, K1. First relay, K2. Second relay, D1. First diode, D2. Second diode. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. It should be noted that, unless otherwise explicitly specified and limited, the terms "access", "connection", and "setting" should be interpreted broadly. For those skilled in the art, the specific meaning of the above terms in this patent can be understood according to the specific circumstances.

[0021] like Figure 1 As shown, a power supply circuit for a high-voltage data center lithium battery management system includes an AC input power supply circuit 1 and a battery input power supply circuit 2. The AC input power supply circuit 1 includes an AC input terminal, an AC / DC converter, and a first diode D1. The AC input terminal is connected to the input terminal of the AC / DC converter, and the anode of the first diode D1 is connected to the positive output terminal of the AC / DC converter. The battery input power supply circuit 2 includes a battery voltage input terminal, a DC / DC converter, a first relay K1, a second relay K2, and a second diode D2. The battery voltage input terminal is connected to the input terminal of the DC / DC converter. The first relay K2 is connected between the positive input terminal of the battery voltage input terminal and the positive input terminal of the DC / DC converter. The anode of the second diode D2 is connected to the positive output terminal of the DC / DC converter, and the second relay K2 is connected between the positive output terminal of the DC / DC converter and the anode of the second diode D2.

[0022] The first relay K1 is a high-voltage, low-current relay, and its rated voltage is not lower than the highest input voltage at the battery voltage input terminal. The second relay K2 is a low-voltage, medium-current relay, and its rated voltage matches the output voltage of the DC / DC converter. Both the high-voltage, low-current and low-voltage, medium-current relays meet UL certification requirements and are less expensive than miniature circuit breakers. Therefore, by replacing traditional miniature circuit breakers with the first relay K2 and the second relay K2 at the input and output terminals of the DC / DC converter respectively, the on / off control switch can meet high-voltage resistance requirements and reduce its cost.

[0023] The control terminals of the first relay K1 and the second relay K2 are respectively connected to a control module located outside the battery input power supply circuit 2, which outputs drive signals to the first relay K1 and the second relay K2. Each of the control terminals of the first relay K1 and the second relay K2 is equipped with a drive coil. The drive coil receives the drive signal, causing the first relay K1 and the second relay K2 to close when the drive signal is maintained and to open when the drive signal is interrupted, facilitating control.

[0024] The positive output terminal of AC input power supply circuit 1 is connected to the positive output terminal of battery input power supply circuit 2, and both are connected to the lithium battery management system. The negative output terminal of AC input power supply circuit 1 is connected to the negative output terminal of battery input power supply circuit 2, and both are connected to the lithium battery management system, thus outputting two 24V DC voltages to the lithium battery management system. Even if AC input power supply circuit 1 is de-energized, the DC input of battery input power supply circuit 2 can still maintain the closure of the relays at both ends of the DC / DC converter, ensuring that battery input power supply circuit 2 can normally supply power to the lithium battery management system and guaranteeing reliability during use.

[0025] The power supply principle of this utility model is as follows: When the high-voltage data center lithium battery management system is first powered on, the AC input power supply circuit 1 provides the power required for the operation of the lithium battery management system. After the system power-on self-test is normal, the control module outputs a drive signal to the control terminals of the first relay K1 and the second relay K2. After receiving the drive signal, the drive coils of the first relay K1 and the second relay K2 control terminals control the first relay K1 and the first relay K2 to close. At this time, the battery input power supply circuit 2 can also provide the power required for the operation of the lithium battery management system. Even if the AC power fails, normal power supply can still be achieved, continuously ensuring the backup power needs of the data center. Once the lithium battery itself has a low power level and cannot meet the backup power needs, the control module interrupts the output of the drive signal, thereby disconnecting the first relay K1 and the second relay K2, reducing further power consumption of the system when the lithium battery power is low. Disconnecting either the first relay K1 or the second relay K2 can cut off the output of the battery input power supply circuit 2, thereby effectively ensuring that the lithium battery management system can still reliably power down even if either the first relay K1 or the second relay K2 sticks together, avoiding the lithium battery from being discharged due to its own system power consumption, and ensuring safety during use.

[0026] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A power supply circuit for a high-voltage data center lithium battery management system, characterized in that, Includes AC input power supply circuitry and battery input power supply circuitry; The AC input power supply circuit includes an AC input terminal, an AC / DC converter, and a first diode. The AC input terminal is connected to the input terminal of the AC / DC converter, and the anode of the first diode is connected to the positive output terminal of the AC / DC converter. The battery input power supply circuit includes a battery voltage input terminal, a DC / DC converter, a first relay, a second relay, and a second diode. The battery voltage input terminal is connected to the input terminal of the DC / DC converter. The first relay is connected between the positive input terminal of the battery voltage input terminal and the positive input terminal of the DC / DC converter. The anode of the second diode is connected to the positive output terminal of the DC / DC converter. The second relay is connected between the positive output terminal of the DC / DC converter and the anode of the second diode.

2. The power supply circuit for a high-voltage data center lithium battery management system according to claim 1, characterized in that, The first relay is a high-voltage, low-current relay, and the rated voltage of the first relay is not lower than the highest input voltage of the battery voltage input terminal.

3. The power supply circuit for a high-voltage data center lithium battery management system according to claim 1, characterized in that, The second relay is a low-voltage, small-current relay, and its rated voltage is matched with the output voltage of the DC / DC converter.

4. The power supply circuit for a high-voltage data center lithium battery management system according to claim 1, characterized in that, The control terminals of the first relay and the second relay are respectively connected to the control module, which is located outside the battery input power supply circuit. The control module outputs drive signals to the first relay and the second relay.

5. The power supply circuit for a high-voltage data center lithium battery management system according to claim 4, characterized in that, The control terminals of the first relay and the second relay are respectively provided with drive coils, which can receive drive signals; the drive coils control the first relay and the second relay to close when the drive signal is maintained, and control the first relay and the second relay to open when the drive signal is interrupted.

6. The power supply circuit for a high-voltage data center lithium battery management system according to claim 1, characterized in that, The positive output terminal of the AC input power supply circuit is connected to the positive output terminal of the battery input power supply circuit and is jointly connected to the lithium battery management system. The negative output terminal of the AC input power supply circuit is connected to the negative output terminal of the battery input power supply circuit and is jointly connected to the lithium battery management system.

7. The power supply circuit for a high-voltage data center lithium battery management system according to claim 6, characterized in that, The voltage output from both the AC input power supply circuit and the battery input power supply circuit to the lithium battery management system is 24V DC.

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