Power board with monitoring function

Abstract

The utility model discloses a power board with a monitoring function, and relates to the technical field of power boards. An input pin of the positive electrode input unit is connected with a positive electrode of the battery pack, an output pin of the positive electrode input unit is connected with the DC / DC converter, the positive electrode relay and the pre-charging unit, and the positive electrode relay and the pre-charging unit are both connected with the positive electrode output unit; an input pin of the cathode input unit is connected with a cathode of the battery pack, an output pin of the cathode input unit is respectively connected with the DC / DC converter and the cathode relay through the current sensor, and the cathode relay is respectively connected with the cathode output unit and the heating control unit; the power amplifier board can control energy conversion in an energy storage system and has the advantage of being small in size.

Description

Technical Field

[0001] The utility model relates to the technical field of power boards, and particularly relates to a power board with a monitoring function. Background Technique

[0002] A power energy storage system is a new type of energy storage system composed of multiple battery packs, a BMS, a PCS, and a power distribution module. In this energy storage system, generally, the BMS module is responsible for managing and controlling the operation of multiple battery packs, the power distribution module is responsible for reasonably distributing and regulating the power, and the PCS controls the charging and discharging of the battery packs; among them, as the "brain" of the electrical system, the main function of the power distribution module is to reasonably distribute and regulate the power of each battery pack in the energy storage system;

[0003] The traditional power distribution module uses a PDU power distribution unit. Although the PDU has the function of power distribution, that is, it can distribute multiple power outputs from a main power input to meet the needs of multiple devices, and the PDU can provide real-time monitoring of the power usage, helping users understand the energy consumption of each device, and supporting remote monitoring and control. The status can be queried and the power on and off operations can be performed through the network. Moreover, the PDU also includes safety features such as overload protection, lightning protection, and surge suppression to protect the connected devices from damage;

[0004] However, since the PUD is mainly used for power distribution, but various functions of the PUD need to be completed by external control devices, resulting in a large space occupancy rate of the overall power energy storage system. And the PUD generally uses physical means such as fuses and relays to achieve the circuit protection function, but such physical devices will cause the PUD to occupy too much area, affecting the overall volume of the power energy storage system;

[0005] Therefore, we propose a power distribution module that can control the energy conversion in the energy storage system and has a small volume. Content of the Utility Model

[0006] In order to overcome the deficiencies in the background technique, the utility model discloses a power board with a monitoring function.

[0007] To achieve the above-mentioned invention purpose, the utility model adopts the following technical scheme:

[0008] A power board with a monitoring function includes a positive input unit, a DC / DC converter, a positive relay, a pre-charging unit, a negative input unit, a negative relay, a negative output unit, a heating control unit, a voltage acquisition unit, and a temperature acquisition unit;

[0009] The input pin of the positive electrode input unit is electrically connected to the positive electrode of the battery pack. The output pins of the positive electrode input unit are respectively electrically connected to the DC / DC converter, the positive electrode relay, and the pre-charge unit. Both the positive electrode relay and the pre-charge unit are electrically connected to the positive electrode output unit;

[0010] The input pin of the negative electrode input unit is electrically connected to the negative electrode of the battery pack. The output pins of the negative electrode input unit are respectively electrically connected to the DC / DC converter and the negative electrode relay through a current sensor. The negative electrode relay is respectively electrically connected to the negative electrode output unit and the heating control unit;

[0011] The output pin of the DC / DC converter is electrically connected to the power input pin of the BMS system. The positive electrode output unit and the negative electrode output unit are respectively electrically connected to the positive electrode and the negative electrode of the PCS system;

[0012] The signal output pin of the voltage acquisition unit is electrically connected to the BMS system. The signal input pins of the voltage acquisition unit are respectively electrically connected to the DC / DC converter, the positive electrode input unit, and the negative electrode input unit;

[0013] The signal input pin of the temperature acquisition unit is electrically connected to the BMS system. The signal output pins of the temperature acquisition unit are respectively electrically connected to the positive electrode relay, the negative electrode relay, the pre-charge unit, and the heating control unit.

[0014] Preferably, the DC / DC converter includes a filter circuit, a switching circuit, a feedback circuit, and an isolation circuit. Among them, the filter circuit is electrically connected to the positive electrode input unit, the filter circuit is electrically connected to the switching circuit, and the switching circuit can receive the acquisition signal of the voltage acquisition unit and control the power-on and power-off operations of the battery pack according to the acquisition signal;

[0015] The switching circuit is respectively electrically connected to the isolation circuit and the feedback circuit. Among them, the isolation circuit is electrically connected to the voltage acquisition unit, and the feedback circuit is electrically connected to the temperature acquisition unit.

[0016] Preferably, the heating control unit includes a heating control relay, a positive electrode heating control chip, and a negative electrode heating control chip. Among them, the input pin of the heating control relay is electrically connected to the negative electrode relay, the output pin of the heating control relay is electrically connected to the negative electrode heating control chip, and the positive electrode heating control chip is electrically connected to the heating control relay.

[0017] Preferably, a thermistor is respectively arranged outside the positive electrode input unit, the negative electrode input unit, the positive electrode output unit, and the negative electrode output unit, and all four thermistors are electrically connected to the temperature acquisition unit.

[0018] Preferably, the positive electrode input unit is electrically connected to the DC / DC converter, the positive electrode relay, and the pre-charge unit through a fuse.

[0019] Preferably, the current sensor is a shunt resistor.

[0020] Preferably, the current sensor is a Hall sensor.

[0021] Due to the adoption of the above-mentioned technical solution, the utility model has the following beneficial effects:

[0022] A power board with a monitoring function disclosed by the utility model

[0023] 1. Integration: Compared with the traditional PDU control module, the power board integrates multiple control functions, such as relay control, DC / DC converter, and heating control, thus making the electrical system more compact and simple, and reducing system complexity.

[0024] 2. Multifunction: Through fuses and shunt resistors, each control function unit of the power board has an overload protection function, and can quickly cut off in case of abnormal circuit, thus avoiding safety accidents caused by circuit failures.

[0025] 3. Lightweight: Since the unit modules in the power board are all integrated on the PCB board, it has the advantages of small volume, convenient installation and maintenance, and is more advantageous in terms of volume and aesthetics compared with similar energy storage products. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a structural schematic diagram of the utility model;

[0027] Figure 2 is a circuit structural schematic diagram of the positive input unit;

[0028] Figure 3 is a circuit structural schematic diagram of the DC / DC converter;

[0029] Figure 4 is a circuit structural schematic diagram of the negative input unit;

[0030] Figure 5 is a circuit structural schematic diagram of the temperature acquisition unit;

[0031] Figure 6 is a circuit structural schematic diagram of the voltage acquisition unit;

[0032] Figure 7 is a circuit structural schematic diagram of the thermistor.

[0033] In the figure: 1. Positive electrode input unit; 2. DC / DC converter; 21. Filter circuit; 22. Switching circuit; 23. Feedback circuit; 24. Isolation circuit; 3. Positive electrode relay; 4. Pre-charge unit; 5. Positive electrode output unit; 6. Negative electrode input unit; 7. Negative electrode relay; 8. Negative electrode output unit; 9. Heating control unit; 91. Heating control relay; 92. Negative electrode heating control chip; 93. Positive electrode heating control chip; 10. Voltage acquisition unit; 11. Temperature acquisition unit; 12. Fuse; 13. Thermistor. Detailed implementation mode

[0034] Next, the technical solutions of the present invention will be described in conjunction with the accompanying drawings in the embodiments of the present invention. In the description, it should be understood that if there are terms such as "upper", "lower", "front", "rear", "left", "right", etc. indicating the orientation or positional relationship, they are only corresponding to the accompanying drawings of the present invention for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation:

[0035] Combined with the attached Figures 1-7 The described power board with monitoring function includes a positive electrode input unit 1, a DC / DC converter 2, a positive electrode relay 3, a pre-charge unit 4, a negative electrode input unit 6, a negative electrode relay 7, a negative electrode output unit 8, a heating control unit 9, a voltage acquisition unit 10 and a temperature acquisition unit 11;

[0036] The input pin of the positive electrode input unit 1 is electrically connected to the positive electrode of the battery pack, and the output pins of the positive electrode input unit 1 are respectively electrically connected to the DC / DC converter 2, the positive electrode relay 3 and the pre-charge unit 4. Both the positive electrode relay 3 and the pre-charge unit 4 are electrically connected to the positive electrode output unit 5;

[0037] The input pin of the negative electrode input unit 6 is electrically connected to the negative electrode of the battery pack, and the output pin of the negative electrode input unit 6 is electrically connected to the DC / DC converter 2 and the negative electrode relay 7 respectively through a current sensor. The negative electrode relay 7 is respectively electrically connected to the negative electrode output unit 8 and the heating control unit 9;

[0038] Among them, between the circuits where the positive electrode input unit 1 and the negative electrode input unit 6 are located are two parallel circuits, and the positive electrode input unit 1 and the negative electrode input unit 6 are respectively connected to the positive electrode and the negative electrode of the battery pack, that is, the power input end of this power board. The positive electrode relay 3 and the negative electrode relay 7 are used to control the conduction of the positive electrode circuit and the negative electrode circuit. The DC / DC converter 2 converts the voltages of the positive electrode input unit 1 and the negative electrode input unit 6 into low-voltage electricity and then outputs it to the BMS system to supply power to it;

[0039] It should be noted that the ultra-wide input voltage range of the DC / DC converter 2 is: 80 - 750 VDC, the output voltage is: 24 VDC, and the DC / DC converter 2 has functions such as input undervoltage, reverse connection protection, output short circuit, overcurrent, and overvoltage protection, which can ensure safe power supply to the BMS system;

[0040] In addition, the pre-charge unit 4 is responsible for slowly applying the voltage of the high-voltage battery to the capacitor on the power board to prevent instantaneous large current impact. This process is called pre-charging, which can protect the battery and the capacitor on this power board from damage. If the temperature acquisition unit 11 obtains a stable temperature of the pre-charge unit 4 through the BMS system, it indicates that the pre-charging process is not required. Thus, the temperature acquisition unit 11 will send a control signal to the pre-charge unit 4 to cut off the operation of the pre-charge unit 4 and allow this power board to operate normally;

[0041] The output pins of the DC / DC converter 2 are electrically connected to the power input pins of the BMS system, and the positive output unit 5 and the negative output unit 8 are respectively electrically connected to the positive and negative poles of the PCS system;

[0042] The signal output pins of the voltage acquisition unit 10 are electrically connected to the BMS system, and the signal input pins of the voltage acquisition unit 10 are respectively electrically connected to the DC / DC converter 2, the positive input unit 1, and the negative input unit 6;

[0043] The signal input pins of the temperature acquisition unit 11 are electrically connected to the BMS system, and the signal output pins of the temperature acquisition unit 11 are respectively electrically connected to the positive relay 3, the negative relay 7, the pre-charge unit 4, and the heating control unit 9;

[0044] Among them, when the BMS system detects that the current input to the battery pack is too large, it controls a large current with a small current through a circuit to achieve the switching operation of electrical equipment, avoiding the dangerous consequences caused by directly controlling and adjusting the large current in the battery pack;

[0045] When the BMS system detects that the charging voltage of the battery pack is too high, the BMS system will control the voltage acquisition unit 10 to sample the contact P+ between the positive input unit 1 and the positive relay 3, and the contact B+ between the positive relay 3 and the positive output unit 5. And the voltage acquisition unit 10 will report the sampling result to the PCS to reduce the charging power of the battery pack and prevent overvoltage faults in the battery pack;

[0046] If the BMS system collects that the ambient temperature outside the battery pack is too low, the BMS system will control the temperature acquisition unit 11 to send a heating signal to the heating control unit 9, and the heating control unit 9 will control the battery pack to increase the output power, thereby increasing the temperature of the battery pack itself to resist the low temperature outside.

[0047] Embodiment 2 is as follows:

[0048] Based on Embodiment 1, the DC / DC converter 2 is further defined. That is, the DC / DC converter 2 includes an isolation circuit 24, a filtering circuit 21, a switching circuit 2, and a feedback circuit 23. Among them, the filtering circuit 21 is electrically connected to the positive input unit 1, the filtering circuit 21 is electrically connected to the switching circuit 2, and the switching circuit 2 can receive the acquisition signal of the voltage acquisition unit 10 and control the power-on and power-off operations of the battery pack according to the acquisition signal;

[0049] The switching circuit 2 is electrically connected to the isolation circuit 24 and the feedback circuit 23 respectively. Among them, the isolation circuit 24 is electrically connected to the voltage acquisition unit 10, and the feedback circuit 23 is electrically connected to the temperature acquisition unit 11;

[0050] Among them, the filtering circuit 21 is used to filter the input voltages of the positive input unit 1 and the negative input unit 6, eliminate the noise in the input voltages, and perform a step-down operation on the input voltages to ensure a stable output of 24 VDC to the BMS system;

[0051] The switching circuit 22 has a load control function and can control the power-on of the BMS system through two pins, SW1 and SW2, that is, supply power to the BMS system through SW1 and SW2;

[0052] The feedback circuit 23 is used to feedback the voltage information of the DC / DC converter 2 itself, that is, the voltage information output to the BMS system, to the voltage acquisition unit 10 and output it to the BMS system to maintain data interaction, so that the BMS system can understand the working states of the circuits where the positive input unit 1 and the negative input unit 6 are located, and thus timely adjust the output voltage and output power of the battery pack;

[0053] The isolation circuit 24 is used to receive the dangerous signal sent by the BMS system. If the BMS system sends signals such as short circuit or open circuit representing dangerous situations of the energy storage system, the switching circuit 22 will disconnect, cutting off the power supply to the BMS system, which will cause the entire energy storage system to be cut off.

[0054] Embodiment 3 is as follows:

[0055] Based on Embodiment 1, the heating control unit 9 is further defined. That is, the heating control unit 9 includes a heating control relay 91, a positive heating control chip 93, and a negative heating control chip 92. Among them, the input pin of the heating control relay 91 is electrically connected to the negative relay 7, the output pin of the heating control relay 91 is electrically connected to the negative heating control chip 92, and the positive heating control chip 93 is electrically connected to the heating control relay 91;

[0056] Among them, the heating control relay 91 is used to receive the heating signal from the heating acquisition unit 11. After the heating control relay 91 is closed, the positive heating control chip 93 and the negative heating control chip 92 transmit the heating signal to the PCS, and the PCS controls the charging or discharging power of the battery pack to increase the temperature of the battery pack to resist the external low temperature and prevent the battery pack from malfunctioning in a low temperature environment.

[0057] Embodiment 4 is as follows:

[0058] On the basis of Embodiment 1, a thermistor 13 is respectively provided outside the positive input unit 1, the negative input unit 6, the positive output unit 5, and the negative output unit 8, and the four thermistors 13 are all electrically connected to the temperature acquisition unit 11;

[0059] As can be seen from the appendix Figures 5-7 The four thermistors 13 are all connected to the temperature acquisition unit 11. Two of the thermistors 13 are used to collect the reliability of the battery input end, that is, the connection reliability of the positive input unit 1 and the negative input unit 6, and the other two thermistors 13 are used to collect the reliability of the battery output end, that is, the connection reliability of the positive output unit 5 and the negative output unit 8;

[0060] When the temperature acquisition unit collects that the temperature signal of the thermistor 13 is too high, it means that the power board outputs overcurrent and overload and generates too much heat. Then the temperature acquisition unit 11 reports the temperature information to the BMS system, and the BMS system reduces the load of the battery pack to reduce the temperature of the power board.

[0061] Embodiment 5 is as follows:

[0062] On the basis of Embodiment 1, the positive input unit 1 is electrically connected to the DC / DC converter 2, the positive relay 3, and the pre-charge unit 4 through a fuse 12. The fuse 12 has the functions of overload and short-circuit protection and can disconnect when the current input to the battery is too large or short-circuited, thereby protecting the subsequent DC / DC converter 2, positive relay 3, and pre-charge unit 4 from being damaged.

[0063] Embodiment 6 is as follows:

[0064] On the basis of Embodiment 1, the current sensor is a shunt; in addition, the current sensor can also be a Hall sensor;

[0065] For the shunt and the Hall sensor, the two can exist on this power board at the same time, but only one of them performs current acquisition work during operation;

[0066] The advantages of the shunt include:

[0067] 1. Simple structure and easy to use: The shunt calculates the current value by measuring the voltage drop across the current detection resistor of known resistance. This method is economical, accurate, effective, and theoretically has unlimited bandwidth;

[0068] 2. High reliability: Due to its simple structure, the shunt is not prone to failure and maintenance is relatively convenient;

[0069] 3. Widely used: It has the characteristics of high precision and fast response in low-frequency and small current measurement, and is often used in DC panels, excitation cabinets and other occasions;

[0070] However, the shunt also has the following disadvantages:

[0071] Limited accuracy: The accuracy of the shunt is affected by the temperature coefficient. Under high current conditions, the resistor heating may cause large errors.

[0072] The advantages of Hall sensors include:

[0073] 1. High sensitivity: Based on the Hall effect, the Hall sensor can detect tiny changes in the magnetic field and achieve high-precision measurement of the magnetic field;

[0074] 2. Fast response speed: The output of the Hall sensor can change in real time with the change of the magnetic field, and has good dynamic response performance;

[0075] 3. Non-contact measurement: no contact with the object being measured is required, and no damage will be caused to the object being measured;

[0076] 4. Good durability: simple structure, no mechanical parts, not susceptible to mechanical damage;

[0077] However, Hall sensors also have certain disadvantages:

[0078] 1. Temperature drift: The output signal of the Hall sensor will be affected by temperature and there will be a certain temperature drift phenomenon;

[0079] 2. Poor linearity: The relationship between the output signal of the Hall sensor and the magnetic field is not completely linear, and there is a certain nonlinear error;

[0080] Therefore, the choice of current sensor needs to be determined based on actual conditions.

[0081] The parts of the present invention that are not described in detail are prior art. It is obvious to those skilled in the art that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is limited by the attached claims rather than the above description. Therefore, it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the present invention, and any figure marks in the claims should not be regarded as limiting the claims involved.

Claims

1. A power board with monitoring function, characterized in that: It comprises a positive input unit (1), a DC / DC converter (2), a positive relay (3), a pre-charging unit (4), a negative input unit (6), a negative relay (7), a negative output unit (8), a heating control unit (9), a voltage collection unit (10) and a temperature collection unit (11); The input pin of the positive input unit (1) is electrically connected to the positive electrode of the battery pack, the output pin of the positive input unit (1) is electrically connected to the DC / DC converter (2), the positive relay (3) and the pre-charging unit (4), respectively, and the positive relay (3) and the pre-charging unit (4) are both electrically connected to the positive output unit (5); The input pin of the negative electrode input unit (6) is electrically connected to the negative electrode of the battery pack, the output pin of the negative electrode input unit (6) is electrically connected to the DC / DC converter (2) and the negative electrode relay (7) through a current sensor, and the negative electrode relay (7) is electrically connected to the negative electrode output unit (8) and the heating control unit (9) respectively; The output pin of the DC / DC converter (2) is electrically connected to the power input pin of the BMS system, and the positive output unit (5) and the negative output unit (8) are electrically connected to the positive and negative electrodes of the PCS system respectively; The signal output pin of the voltage acquisition unit (10) is electrically connected to the BMS system, and the signal input pin of the voltage acquisition unit (10) is electrically connected to the DC / DC converter (2), the positive input unit (1) and the negative input unit (6) respectively; The signal input pin of the temperature acquisition unit (11) is electrically connected to the BMS system, and the signal output pin of the temperature acquisition unit (11) is electrically connected to the positive relay (3), the negative relay (7), the pre-charging unit (4) and the heating control unit (9), respectively.

2. The power board with monitoring function as claimed in claim 1, characterized in that: The DC / DC converter (2) comprises a filter circuit (21), a switch circuit (22), a feedback circuit (23) and an isolation circuit (24), wherein the filter circuit (21) is electrically connected to the positive input unit (1), the filter circuit (21) is electrically connected to the switch circuit (22), and the switch circuit (22) is capable of receiving a collection signal from a voltage collection unit (10) and controlling the power-on and power-off operations of the battery pack according to the collection signal; The switch circuit (22) is electrically connected to the isolation circuit (24) and the feedback circuit (23) respectively, wherein the isolation circuit (24) is electrically connected to the voltage acquisition unit (10), and the feedback circuit (23) is electrically connected to the temperature acquisition unit (11).

3. The power board with monitoring function as claimed in claim 1, characterized in that: The heating control unit (9) comprises a heating control relay (91), a positive electrode heating control chip (93) and a negative electrode heating control chip (92), wherein an input pin of the heating control relay (91) is electrically connected to the negative electrode relay (7), an output pin of the heating control relay (91) is electrically connected to the negative electrode heating control chip (92), and the positive electrode heating control chip (93) is electrically connected to the heating control relay (91).

4. The power board with monitoring function as claimed in claim 1, characterized in that: The positive input unit (1), the negative input unit (6), the positive output unit (5) and the negative output unit (8) are each provided with a thermistor (13) outside, and the four thermistors (13) are all electrically connected to the temperature acquisition unit (11).

5. The power board with monitoring function as claimed in claim 1, characterized in that: The positive input unit (1) is electrically connected to the DC / DC converter (2), the positive relay (3) and the pre-charging unit (4) via a fuse (12).

6. The power board with monitoring function as claimed in claim 1, characterized in that: The current sensor is configured as a shunt.

7. The power board with monitoring function as claimed in claim 1, characterized in that: The current sensor is configured as a Hall sensor.

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