Battery management system and device

Abstract

The present invention discloses a battery management system, including a first battery connection terminal, a fuse, an overcharge protection unit, a first charging power connection terminal, a second battery connection terminal, a second charging power connection terminal, a DC power module, a high voltage module and an AC power supply; the first battery connection terminal is connected to the first end of the fuse, the second end of the fuse is connected to one end of the overcharge protection unit, and the other end of the overcharge protection unit is connected to the first charging power connection terminal; the second battery connection terminal is respectively connected to the second charging power connection terminal and the first output terminal of the DC power module, the input terminal of the DC power module is connected to the positive output terminal of the high voltage module, and the positive battery terminal of the high voltage module is connected to the overcharge protection unit; the AC power supply is connected to the first input terminal of the high voltage module. The present invention also provides a battery management device. The present invention can meet the matching use between batteries and all types of UPS.

Description

Technical Field

[0001] The present invention belongs to the field of battery technology, and in particular relates to a battery management system and device. Background Art

[0002] With the growing demand for high-performance technologies such as AI, cloud computing, and big data, data centers will become larger and more complex. As the core part of the data center, the reliability of the uninterruptible power supply (UPS) and batteries is directly related to the normal operation of the data center. UPS lithium batteries have the advantages of safety, reliability, long service life, small footprint, and simple operation and maintenance. UPS manufacturers on the market have begun to widely use new lithium batteries, and UPS lithium batteries are increasingly used in data centers.

[0003] UPS lithium batteries are equipped with a built-in battery management system (BMS), which can provide monitoring and maintenance functions such as automatic internal battery status, fault monitoring, battery balancing and external communication. The battery management system enables data center operation and maintenance engineers to more easily monitor the battery's operating time and health status, reduce labor and maintenance costs, and significantly reduce the risk of battery pack failure.

[0004] In the existing battery management system, when the mains power is off, the UPS supplies power to the lithium battery. After the lithium battery is discharged, if the mains power is not restored, the UPS cannot replenish the lithium battery in time. Due to the power consumption of the BMS, the battery voltage continues to decrease until the battery shuts down. After the mains power is restored, the UPS cannot charge the battery because the battery has been shut down. It needs to be turned on manually, and at this time, the UPS needs to have a strong charging function to charge the battery. Summary of the invention

[0005] The embodiments of the present invention provide a battery management system and a battery management system, which are intended to solve the problem that if a lithium battery is not charged in time after being discharged, the voltage of the lithium battery will continue to decrease due to the power consumption of the BMS, and the lithium battery will eventually shut down (or trigger a secondary protection trip). The operation and maintenance personnel need to perform manual operation to restart the lithium battery, and the UPS is required to have a strong charging function to charge the lithium battery.

[0006] To achieve the above-mentioned object, on the one hand, an embodiment of the present invention provides a battery management system, including a first battery connection terminal, a fuse, an overcharge protection unit, a first charging power connection terminal, a second battery connection terminal, a second charging power connection terminal, a DC power module, a high voltage module and an AC power supply;

[0007] The first battery connection end is connected to the first end of the fuse, the second end of the fuse is connected to one end of the overcharge protection unit, and the other end of the overcharge protection unit is connected to the first charging power connection end;

[0008] The second battery connection terminal is respectively connected to the second charging power connection terminal and the first output terminal N of the DC power module, the input terminal of the DC power module is connected to the positive electrode of the output terminal of the high-voltage module, and the positive electrode of the battery terminal of the high-voltage module is connected to the overcharge protection unit;

[0009] The AC power source is connected to the first input terminal of the high voltage module.

[0010] Optionally, the output end of the DC power supply module is connected to the second input end of the high voltage module.

[0011] Optionally, the battery management system further includes a Hall element, and the Hall element is connected between the overcharge protection unit and the first charging power supply connection terminal.

[0012] Optionally, the battery management system further includes a communication display adapter board, and the communication display adapter board is connected to the first output terminal of the high-voltage module.

[0013] Optionally, the overcharge protection unit includes a first relay, a second relay, a third relay, a first diode, a second diode, and a resistor;

[0014] The first relay and the second relay are connected in series, one end of which is connected to the first battery connection end, and the other end of which is connected to the first charging power connection end;

[0015] The third relay and the resistor are connected in series, one end of which is connected to the first battery connection end, and the other end of which is connected to the first charging power supply connection end;

[0016] One end of the first diode and the second diode connected in series is connected to the first battery connection end, and the other end is connected to the first charging power connection end;

[0017] The second end of the first diode is connected to the first end of the second relay.

[0018] Optionally, the positive electrode of the battery terminal of the high-voltage module is connected between the first relay and the second relay.

[0019] Optionally, the first charging power connection terminal is connected to a first voltage detection terminal of the high voltage module, and the second charging power connection terminal is connected to a second voltage detection terminal of the high voltage module.

[0020] On the other hand, an embodiment of the present invention further provides a battery management device, comprising the battery management system and a charging power supply, wherein the charging power supply is connected to a charging power supply connection terminal of the battery management system.

[0021] Optionally, the charging power supply is an uninterruptible power supply (UPS).

[0022] Optionally, the battery connection terminal of the battery management system is used to connect a lithium battery.

[0023] Optionally, the connection is made via 2-BVR35 wires. The wiring is fixed and flexible, and can be suitable for use with various power devices.

[0024] Implementing the embodiments of the present invention has the following beneficial effects:

[0025] The present invention sets a fuse between the first battery connection terminal and the overcharge protection unit, so that the battery management system of the present application can meet a larger current, and the strong charging function of the UPS is no longer required. The lithium battery using the BMS of the present application can be used in conjunction with a UPS with a higher power level.

[0026] In addition, the present application controls the startup of the battery management unit BMS through an AC power signal, which solves the problem that after the battery is discharged, the BMS shuts down due to power consumption, and needs to be manually turned on when powered on again, and requires the UPS to have a strong charging function. With the battery of the new BMS, after the battery is discharged, the BMS no longer needs to be manually turned on after power is turned off. After the mains power is restored, the BMS automatically starts up, and the UPS can charge the battery. In actual working conditions, the operation of the operation and maintenance personnel is simplified. The present invention can meet the matching use between batteries and all UPS. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic structural diagram of a battery management system according to an embodiment of the present invention;

[0028] Figure 2 is a schematic structural diagram of a battery management system according to another embodiment of the present invention;

[0029] Figure 3 It is a structural schematic diagram of a battery management device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0030] The following will be combined with the 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 described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, top, bottom...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0032] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0033] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0034] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0035] At present, the existing battery management system has the following disadvantages: when the mains power is cut off, the UPS supplies power to the lithium battery. After the lithium battery is discharged, if the mains power is not restored, the UPS cannot replenish the lithium battery in time, and due to the power consumption of the BMS, the battery voltage continues to decrease until the battery shuts down. After the mains power is restored, since the battery has been shut down, the UPS cannot charge the battery and needs to be manually turned on. At this time, the UPS needs to have a strong charging function to charge the battery. In order to solve the above technical problems, the present invention proposes a battery management system, after the mains power is restored, the battery can be automatically turned on, and the UPS can be charged without the need for strong charging requirements.

[0036] Unless otherwise specified, in the present application, except for the first relay, the second relay, etc., which represent the serial numbers of the components, the "first" represents the positive pole and the "second" represents the negative pole.

[0037] like Figure 1 As shown, an embodiment of the present invention provides a battery management system, including a first battery connection terminal B+, a fuse FU1, an overcharge protection unit 10, a first charging power connection terminal P+, a second battery connection terminal B-, a second charging power connection terminal P-, a DC power module 20, a high voltage module 30 and an AC power supply;

[0038] The first battery connection terminal B+ is connected to the first end of the fuse FU1, the second end of the fuse FU1 is connected to one end of the overcharge protection unit 10, and the other end of the overcharge protection unit 10 is connected to the first charging power connection terminal P+;

[0039] The second battery connection terminal B- is respectively connected to the second charging power connection terminal P- and the first output terminal N of the DC power module 20, the input terminal L of the DC power module 20 is connected to the positive output terminal C+ terminal of the high-voltage module 30, and the positive battery terminal DC+ terminal of the high-voltage module 30 is connected to the overcharge protection unit 10; the C+ terminal / DC+ terminal is the two ends of a small relay on the high-voltage module (equivalent to a small switch), the two ends are powered on, the relay is closed, and power is supplied to the high-voltage module; when the two ends are powered off, the relay is disconnected.

[0040] The AC power source is connected to the first input terminal L of the high voltage module 30 .

[0041] In the present application, the fuse FU1 is mainly used to prevent the circuit from being damaged due to excessive current, and can meet the needs of the circuit for a larger current. Exemplarily, the output terminal VO+ of the DC power module 20 is connected to the second input terminal 31 of the high voltage module 30 .

[0042] For example, Figure 2As shown, in another embodiment, the battery management system further includes a Hall element, and the Hall element is connected between the overcharge protection unit 10 and the first charging power connection terminal P+. The Hall element is mainly used to detect the on-off status of the current.

[0043] For example, Figure 2 As shown, in this embodiment, the battery management system further includes a communication display adapter board 40, and the communication display adapter board 40 is connected to the first output terminal 32 of the high voltage module 30. The communication display adapter board 40 is used to display and monitor the working status of the battery in real time.

[0044] Specifically, Figure 2 As shown, in this embodiment, the overcharge protection unit includes a first relay KM1, a second relay KM3, a third relay KM5, a first diode VD1, a second diode VD2, and a resistor R1;

[0045] The first relay KM1 and the second relay KM3 are connected in series, one end of which is connected to the first battery connection terminal B+, and the other end of which is connected to the first charging power connection terminal P+;

[0046] The third relay KM5 and the resistor R1 are connected in series, one end of which is connected to the first battery connection terminal B+, and the other end of which is connected to the first charging power connection terminal P+;

[0047] One end of the first diode VD1 and the second diode VD2 connected in series is connected to the first battery connection terminal B+, and the other end is connected to the first charging power connection terminal P+;

[0048] The second end of the first diode VD1 is connected to the first end of the second relay KM3. That is, the second end of the second diode VD2 is connected to the first end of the first relay KM1. In this way, the current at the input end and the current at the output end are respectively introduced into the on-off branches of the first relay KM1 and the second relay KM3 to detect the on-off conditions of the circuit input end and the output end.

[0049] It should be noted that, after the first relay KM1 and the second relay KM3 are connected in series, one end is connected to the first battery connection terminal B+, and the other end is connected to the first charging power connection terminal P+; specifically, in this embodiment, the first end of the first relay KM1 is connected to the first battery connection terminal B+, the second end of the first relay KM1 is connected to the first end of the second relay KM3, and the second end of the second relay KM3 is connected to the first charging power connection terminal P+.

[0050] Alternatively, in other embodiments, the first end of the second relay KM3 is connected to the first battery connection terminal B+, the second end of the second relay KM3 is connected to the first end of the first relay KM1, and the second end of the first relay KM1 is connected to the first charging power connection terminal P+.

[0051] It should be noted that, after the third relay KM5 and the resistor R1 are connected in series, one end is connected to the first battery connection terminal B+, and the other end is connected to the first charging power connection terminal P+; specifically, in this embodiment, the first end of the third relay KM5 is connected to the first battery connection terminal B+, the second end of the third relay KM5 is connected to the first end of the resistor R1, and the second end of the resistor R1 is connected to the first charging power connection terminal P+.

[0052] Alternatively, in other embodiments, the first end of the resistor R1 is connected to the first battery connection terminal B+, the second end of the first resistor R1 is connected to the first end of the third relay KM5, and the second end of the third relay KM5 is connected to the first charging power connection terminal P+.

[0053] It should be noted that, after the first diode VD1 and the second diode VD2 are connected in series, one end is connected to the first battery connection terminal B+, and the other end is connected to the first charging power connection terminal P+; specifically, in this embodiment, the first end of the first diode VD1 is connected to the first battery connection terminal B+, the second end of the first diode VD1 is connected to the first end of the second diode VD2, and the second end of the second diode VD2 is connected to the first charging power connection terminal P+.

[0054] Alternatively, in other embodiments, the first end of the second diode VD2 is connected to the first battery connection terminal B+, the second end of the second diode VD2 is connected to the first end of the first diode VD1, and the second end of the first diode VD1 is connected to the first charging power connection terminal P+.

[0055] In this embodiment, a current limiting resistor is used to limit the current of the battery management system when it is just turned on and before fault judgment is performed, so as to connect the entire circuit during power-on self-detection and use the resistor to limit the current of the circuit for protection.

[0056] The first diode is used to pass current through the first battery connection terminal to perform fault detection on the battery input terminal, and the second diode is used to pass current through the first charging power supply connection terminal to perform fault detection on the charging power supply output terminal.

[0057] Optionally, the positive battery terminal DC+ terminal of the high voltage module 30 is connected between the first relay KM1 and the second relay KM3 .

[0058] Optionally, the first charging power connection terminal P+ is connected to the first voltage detection terminal of the high voltage module 30, and the second charging power connection terminal P- is connected to the second voltage detection terminal of the high voltage module 30. In this way, the voltage of the bus can be detected when the load is not working.

[0059] On the other hand, Figure 3 As shown, another embodiment of the present invention further provides a battery management device, including the battery management system 100 and a charging power source 200 , wherein the charging power source 200 is connected to a charging power source connection terminal of the battery management system 100 .

[0060] Optionally, the charging power supply 200 is an uninterruptible power supply.

[0061] Optionally, the battery connection terminal of the battery management system 100 is used to connect the lithium battery 300 .

[0062] Optionally, the connection is made through a 2-BVR35 wire connection. The wiring is fixed and flexible, and can be suitable for use with various power devices. The working process and control logic of the circuit of this application are as follows:

[0063] 1. Battery transportation and testing process:

[0064] Press the DC start button switch to start the machine, the power is connected, the indicator light flashes, and the system enters the self-test state. If there is no fault, the relay KM1 / KM3 is energized and the system enters the standby state. If there is a fault, the relay KM1 / KM3 is not energized. (The pre-charge circuit control relay KM5 is first opened when the machine is turned on, and the pre-charge circuit is cut off after the self-test). Press and hold the DC start button switch for more than 5 seconds, the power is disconnected, the indicator light goes out, and the system enters the shutdown state. This method does not connect to AC.

[0065] 2. Working mode between battery and UPS (power on / off control logic):

[0066] Insert AC into the AC port of BMS, connect an AC 220V electrical signal, turn on the battery, connect the power, the indicator light flashes, the system enters the self-test state, if there is no fault, the relay KM1 / KM3 is energized, and the system enters the standby state, if there is a fault, the relay KM1 / KM3 is not energized. (The pre-charge circuit control relay KM5 is first opened when the power is turned on, and the pre-charge circuit is cut off after the self-test). Unplug the AC plug so that the BMS cannot receive the 220V electrical signal, the battery power is disconnected, the indicator light goes out, and the system enters the shutdown state. This method does not connect to DC.

[0067] In this application, AC 220V is an electrical signal, which is used to control the start of the BMS, rather than charging the BMS. After the battery is discharged, if it is not charged in time, the BMS power consumption will continue to consume the battery power. When the battery power or voltage reaches a certain value, the BMS will shut down; when the BMS is shut down, the positive and negative terminals of the battery cannot detect the voltage; after the mains power is restored, the UPS needs to charge the battery. Since the UPS cannot detect the battery voltage, it cannot charge the battery. Only a UPS with a strong charging function can charge the battery when it cannot detect the battery voltage. This application uses AC220V as an electrical signal. After the mains power is restored, the BMS automatically turns on after receiving the AC 220V signal. At this time, the battery has voltage. The UPS detects the battery voltage and can charge the battery; therefore, even if the UPS of this application does not have a strong charging function, the battery can be charged.

[0068] 3. Fault determination:

[0069] The protection caused by the fault during the charging process disconnects the KM1 relay, the protection caused by the fault during the discharging process disconnects the KM3 relay, and the protection caused by the fault in the standby state disconnects all relays.

[0070] 4. In the UPS and battery working mode, after the battery is discharged, the AC power is cut off, triggering the BMS to power off and protect the battery. After the mains power is restored, the AC signal is connected to the BMS, the battery automatically turns on, and the UPS can charge the battery. This logic is suitable for all models of UPS and does not require the UPS to have a strong charging function.

[0071] The present invention solves the problem that after the battery is discharged, the BMS shuts down due to power consumption, and needs to be manually turned on when powered on again, and requires the UPS to have a strong charging function. With the battery of the new BMS, after the battery is discharged, the BMS is powered off, and after the mains power is restored, the BMS automatically turns on, and the UPS can charge the battery. In actual working conditions, the operation of the operation and maintenance personnel is simplified. The present invention no longer requires the strong charging function of the UPS, and can meet the matching use between the battery and all UPS.

[0072] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery management system, characterized in that: It includes a first battery connection terminal, a fuse, an overcharge protection unit, a first charging power connection terminal, a second battery connection terminal, a second charging power connection terminal, a DC power module, a high voltage module and an AC power supply; The first battery connection end is connected to the first end of the fuse, the second end of the fuse is connected to one end of the overcharge protection unit, and the other end of the overcharge protection unit is connected to the first charging power connection end; The second battery connection end is respectively connected to the second charging power connection end and the first output end of the DC power module, the input end of the DC power module is connected to the positive electrode of the output end of the high-voltage module, and the positive electrode of the battery end of the high-voltage module is connected to the overcharge protection unit; The AC power source is connected to the first input terminal of the high voltage module; The overcharge protection unit includes a first relay, a second relay, a third relay, a first diode, a second diode, and a resistor; The first relay and the second relay are connected in series, one end of which is connected to the first battery connection end, and the other end of which is connected to the first charging power connection end; The third relay and the resistor are connected in series, one end of which is connected to the first battery connection end, and the other end of which is connected to the first charging power supply connection end; One end of the first diode and the second diode connected in series is connected to the first battery connection end, and the other end is connected to the first charging power connection end; The second end of the first diode is connected to the first end of the second relay; The first charging power connection terminal is connected to the first voltage detection terminal of the high voltage module, and the second charging power connection terminal is connected to the second voltage detection terminal of the high voltage module.

2. The battery management system according to claim 1, characterized in that: The output end of the DC power module is connected to the second input end of the high voltage module.

3. The battery management system according to claim 1, characterized in that: The battery management system further includes a Hall element connected between the overcharge protection unit and the first charging power supply connection terminal.

4. The battery management system according to claim 2, characterized in that: The battery management system further includes a communication display adapter board, and the communication display adapter board is connected to the first output end of the high voltage module.

5. The battery management system according to claim 1, characterized in that: The positive electrode of the battery terminal of the high voltage module is connected between the first relay and the second relay.

6. A battery management device, characterized in that: It comprises the battery management system and a charging power supply as described in any one of claims 1 to 4, wherein the charging power supply is connected to the charging power supply connection terminal of the battery management system.

7. The battery management device according to claim 6, characterized in that: The charging power supply is an uninterruptible power supply.

8. The battery management device according to claim 7, characterized in that: The battery connection terminal of the battery management system is used to connect the lithium battery.

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