Direct-current high-voltage control box for energy storage and control method

Abstract

The invention provides a direct-current high-voltage control box for energy storage and a control method. The method comprises the following steps: step 1, electrifying the control box; 2, the control box main chip obtains and stores real-time state information of the battery cluster, the PCS, the air conditioning device and the fire fighting device; step 3, the shunting processing device calls the current state information of the battery cluster in the control box main chip to compare and analyze the current state information with the preset standard state information of the battery cluster in the storage device to obtain a preliminary judgment whether the battery cluster is abnormal at present; step 4, according to the judgment result, the system management platform performs grading processing according to the abnormal reason of the battery cluster; according to the direct-current high-voltage control box for energy storage and the control method, the structure of the control box can be optimized, the control flexibility of the control box on all components needing to be controlled is improved, the control accuracy and reliability of the control box are enhanced, the safety of the control box is guaranteed, and the stability of the internal structure of the control box is improved; and the operation safety of personnel is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage, and in particular to a DC high voltage control box for energy storage and a control method thereof. Background Art

[0002] At present, in electrochemical energy storage systems, DC high-voltage control boxes are widely used, and conventional DC high-voltage control boxes are installed on the battery rack of lithium batteries, and their installation position is at the top or bottom of the battery rack, which makes it very inconvenient for operators both in installation and in operation and maintenance. In particular, when a failure or accident occurs in the energy storage battery container, there is a great safety risk when personnel enter the container to troubleshoot the failure or repair the device. In addition, the high-voltage DC relays commonly used in high-voltage control boxes are only unidirectional and cannot effectively extinguish arcs in both directions. The main contacts are prone to arcing and burning and sticking, which makes them unreliable to use and poses a safety hazard. Therefore, it is of great significance to improve the safety and reliability of DC high-voltage control boxes, enhance the structural stability of the control box, and ensure the safety of operators.

[0003] In patent CN217469215U, a new type of energy storage DC high-voltage control box is disclosed, the control box includes a battery cluster management module, a fuse, a fuse holder, a DC-DC converter, a shunt, a maintenance isolation switch, and a push button switch. The battery cluster management module, the fuse, the fuse holder, the DC-DC converter, the shunt, the maintenance isolation switch and the push button switch are arranged in the inner cavity of the control box, the control box is installed at the external position of the lithium battery battery compartment box, and is structurally isolated from the battery compartment. The control box is installed near the battery cluster and the energy storage converter. The control box can be installed outdoors, with a protection level of IP54 or above. The high-voltage control box is installed nearby together with the battery cluster and the energy storage converter. The high-voltage control box is equipped with overcurrent and short-circuit protection fuses. Professionals can operate outside the container, close or disconnect the system circuit, and repair and replace the components in the high-voltage control box. Placing the control box outside the container can help improve the safety of the control box, but after the control box fails, the safety protection of the batteries in the battery compartment box controlled by it is relatively small. Summary of the invention

[0004] In view of this, the present invention aims to propose a DC high-voltage control box and control method for energy storage, so as to solve the problems of low reliability and safety of the control box in the prior art, and poor control flexibility of the control box over various components; thereby optimizing the structure of the control box, improving the control flexibility of the control box over the components to be controlled, enhancing the accuracy and reliability of the control of the control box, ensuring the safety of the control box, improving the stability of the internal structure of the control box, and improving the safety of personnel operations.

[0005] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0006] The present invention relates to a DC high-voltage control box for energy storage and a control method thereof. The control method of the DC high-voltage control box for energy storage comprises the following steps:

[0007] Step 1: Power on the control box;

[0008] Step 2: The main chip of the control box obtains and stores the real-time status information of the battery cluster, PCS, air conditioning device, and fire protection device;

[0009] Step 3: The shunt processing device compares and analyzes the current status information of the battery cluster in the main chip of the control box with the preset standard status information of the battery cluster in the storage device to obtain a preliminary judgment on whether the battery cluster is currently abnormal;

[0010] Step 4: Based on the judgment result, the control box main chip uploads the preliminary judgment result to the system management platform. After accurate judgment, the system management platform performs graded processing according to the abnormal cause of the battery cluster.

[0011] Further, step three includes:

[0012] Step S31: sequentially label the m battery cells in the n battery clusters, and each battery cell is denoted as Aij;

[0013] Step S32: The temperature information Tij of each battery cell in the battery cluster in the main chip of the control box is retrieved by the shunt processing device, and the actual temperature variance value Si^2 of each battery cluster is calculated to be Si^2=[(T-Ti1

[0014] )^2+(T-Ti2)^2+...+(T-Tij)^2+...+(T-Tim)^2] / m;

[0015] Step S33: determine whether the actual temperature variance value Si^2 of each battery cluster is greater than S0. If yes, the battery cluster is abnormal and step 4 is executed; if no, the battery cluster is normal and the process returns to step 2.

[0016] Furthermore, T is the average temperature of m battery cells in each battery cluster, that is, T=(Ti1+Ti2+...+Tij+...+Tim) / m.

[0017] Furthermore, S0 is a preset battery cluster temperature variance value.

[0018] Furthermore, i represents the battery cluster number of the battery cell, and j represents the row number of the battery cell in the same battery cluster; wherein, 1≤i≤n, 1≤j≤m.

[0019] A DC high-voltage control box for energy storage, the control box applies the control method of a DC high-voltage control box for energy storage, the control box comprises a box body, a control box main chip, a battery cluster management module, an isolation module, and a DC / DC conversion device, the control box main chip, the battery cluster management module, the isolation module, and the DC / DC conversion device are all arranged inside the box body, the control box main chip is respectively connected to one end of the battery cluster management module, the isolation module, and the DC / DC conversion device, the other ends of the battery cluster management module and the isolation module are connected in parallel and then connected to the battery cluster, and the other end of the DC / DC conversion device is connected to other components that need to be controlled by the control box.

[0020] Furthermore, other components include any one or more of a PCS, an air conditioning device, and a fire fighting device.

[0021] Furthermore, the control box also includes a protection module, which is arranged in the box body and between the main chip of the control box and the battery cluster management module.

[0022] Furthermore, the protection module adopts a protection circuit including any one or more components of a fuse, a relay, and a circuit breaker.

[0023] Furthermore, the control box also includes a storage device, a shunt processing device and a monitoring device, and the storage device, the shunt processing device and the monitoring device are all connected to the main chip of the control box.

[0024] Compared with the prior art, the DC high voltage control box and control method for energy storage described in the present invention have the following beneficial effects:

[0025] By setting the control box, the structure of the control box can be optimized, the control flexibility of the control box on the components to be controlled can be improved, the accuracy and reliability of the control of the control box can be enhanced, the safety of the control box can be guaranteed, the stability of the internal structure of the control box can be improved, and the safety of personnel operation can be improved. By setting the control method, the control box can more accurately regulate the output voltage and current parameters of each component, which is also conducive to reducing the cost of the control box and enhancing the regulation efficiency of the control box. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings, which constitute part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations of the present invention.

[0027] In the figure:

[0028] Figure 1 This is a schematic diagram of the overall structure of the control box;

[0029] Figure 2 The internal structure of the control box and the overall structure diagram of the energy storage system in which it is located;

[0030] Figure 3 It is a schematic diagram of the internal structure of the energy storage system;

[0031] Figure 4 It is a schematic diagram of the control method flow chart.

[0032] Explanation of the reference numerals: 1. Box body; 2. Control box main chip; 3. Battery cluster management module; 4. Isolation module; 5. DC / DC conversion device; 6. Protection module. DETAILED DESCRIPTION

[0033] The inventive concepts of the present disclosure will be described below using terms commonly used by those skilled in the art to convey the essence of their work to other persons skilled in the art. However, these inventive concepts can be embodied in many different forms and should not be considered limited to the embodiments described herein.

[0034] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0035] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0036] The control box of this embodiment is similar to a conventional control box in that the overall structure is composed of a box body, wires, and switches.

[0037] In order to solve the problems of low reliability and safety of the control box in the prior art, and poor control flexibility of the control box to each component; this embodiment proposes a DC high-voltage control box for energy storage and a control method, wherein the DC high-voltage control box for energy storage includes a box body 1, a control box main chip 2, a battery cluster management module 3, an isolation module 4, and a DC / DC conversion device 5. The control box main chip 2, the battery cluster management module 3, the isolation module 4, and the DC / DC conversion device 5 are all arranged inside the box body 1, and the control box main chip 2 is respectively connected to one end of the battery cluster management module 3, the isolation module 4, and the DC / DC conversion device 5. The other ends of the battery cluster management module 3 and the isolation module 4 are connected in parallel and connected to the battery cluster, and the other end of the DC / DC conversion device 5 is connected to other components required to be controlled by the control box. Among them, the other components include any one or more of PCS, air conditioning device, and fire fighting device. The isolation module 4 is used to bypass the battery cluster management module 3 when it is abnormal, and then perform maintenance, so as to ensure that the circuit can operate normally without interruption. The control box is arranged in parallel with the rack of the battery cluster, and there is a certain gap between the control box and the rack. The control box is arranged near the door of the container to facilitate maintenance and replacement by the staff, and to protect the safety of the operators as much as possible. It can prevent the battery cluster failure from affecting the normal operation of the control box, and prevent the control box failure from affecting the safety of the battery cluster.

[0038] Through the setting of the control box, the structural stability of the DC high-voltage control box can be effectively improved, the safety and reliability of the control box can be enhanced, the control strategy of the control box can be optimized, and the occurrence of abnormal and unpreventable phenomena in the components controlled by the control box after a control box failure can be prevented, thereby ensuring the safety of operators or maintenance personnel.

[0039] The control box also includes a protection module 6, which is arranged in the box body 1. The protection module 6 is arranged between the control box main chip 2 and the battery cluster management module 3. When the battery cluster management module 3 is detected to be abnormal, the circuit is disconnected in time, and the bypass circuit where the isolation module 4 is located is switched through the control box main chip 2 to ensure that the battery cluster can operate stably and continuously, and reduce the energy and cost loss caused by downtime. Among them, the protection module 6 adopts a protection circuit including any one or more components of fuses, relays, and circuit breakers. The box body 1 also includes a fan, which is connected to the system management platform signal in the energy storage system. Under the action of the system management platform in the energy storage system, the fan can be turned on and off, thereby playing a role in cooling the inside of the control box.

[0040] By providing the protection module 6, the stability and safety of the internal circuit of the control box can be effectively improved. While improving the protection of the battery cluster, it is also beneficial to enable the circuit to work uninterruptedly and improve the operational reliability of the circuit.

[0041] The control box also includes a storage device, a shunt processing device and a monitoring device, and the storage device, the shunt processing device and the monitoring device are all connected to the control box main chip 2. The storage device, the shunt processing device and the monitoring device are all arranged in the box body 1. The storage device, the shunt processing device and the monitoring device are integrated with the control box main chip 2 to increase the space occupied by the components in the control box. The storage device is used to store the information collected by the control box main chip 2. The shunt processing device is used to integrate and process the information collected by the control box main chip 2, and after comparing the collected information with the instruction information issued by the system management platform, it is fed back to the control box main chip 2, and the control box main chip 2 accurately controls the voltage, circuit and other parameters that need to be output by different components.

[0042] By setting up storage devices and diversion devices, the control box can effectively realize accurate detection and control of each component. The setting up of monitoring devices is also helpful to ensure the safety of the control box itself.

[0043] The control box also includes a strap setting, at least one strap is set, the wires inside the control box are regulated by the strap, there is a certain gap between the strap and the back plate of the control box, or the strap is fixed on the inner side of the box body 1 of the control box, and the wires pass through the strap setting. By setting the strap, the neatness of the internal circuit of the control box can be improved, and the occurrence of adhesion caused by the intersection of wires can be prevented. The aesthetics of the interior of the control box can be improved, and the safety of the wiring of the control box can be improved. A wire through hole is set on the outside of the control box, and the wire through hole is used to connect the modules in the control box with the modules outside the control box. A film that can be opened and closed is set on the inside of the wire through hole, and the center position of the film is a cross-shaped opening, which can facilitate the passage of wires and is dust-proof, waterproof and dust-proof.

[0044] The control box is applied to an energy storage system, which includes a system management platform, which is respectively connected to the battery cluster, the monitoring device, the PCS, the air conditioning device and the fire fighting device in communication. The control box is used to monitor the real-time information of each component in real time through the system management platform, and then respond in time when an abnormality occurs in each component.

[0045] The system management platform includes a main controller, a processor, a first memory and a second memory. The processor, the first memory and the second memory are all connected to the main controller. The first memory is used to store the real-time status information in the control box obtained by the monitoring device, and the second memory is used to store the real-time status information of other components in the system. On the one hand, the main controller can store the preset values ​​corresponding to different components in the corresponding memory. On the other hand, it can also be used to receive the detected real-time information, store the received real-time information in the corresponding storage area, call the preset value and compare it with the actual value, and feedback the real-time status information of each component to the main controller based on the comparison result. After the main controller analyzes it, it issues different types of instructions to the control box, thereby realizing intelligent monitoring of the control box and ensuring the stable operation of the energy storage system.

[0046] The energy storage system management platform can store the detected information separately, which is helpful to prevent data disorder and improve the accuracy and efficiency of the system management platform's control over the control box. The setting of the processor can help enhance the accuracy of the system management platform's processing of the detected information.

[0047] The monitoring device includes a temperature sensor and a humidity sensor, and the temperature sensor and the humidity sensor are respectively connected to the control box main chip 2 and the system management platform. At least two temperature sensors are set. At least one humidity sensor is set. When two temperature sensors are set, one temperature sensor is set at the location of the control box main chip 2 of the control box, and the other temperature sensor is set outside the control box. The system management platform can preliminarily determine whether the internal circuit of the control box is operating normally by comparing the difference in temperature inside and outside the control box. If the temperature is too high, it proves that there is an abnormality. Under the control of the system management platform, the shunt processing device is mobilized for shunt processing to reduce the frequency of use of the position where the temperature of the control box is too high, and then the temperature is physically cooled in time. It can also start the fan in the control box to adjust the temperature in the control box. In addition, the humidity sensor is used to detect the change of humidity in the control box. According to the detection of the humidity change of the control box in different time periods by the system management platform, it can timely detect whether the control box is flooded, so as to arrange the operator to perform maintenance operations in time.

[0048] By communicating with the system management platform through the monitoring device, the real-time status of the control box can be effectively uploaded, which is beneficial to ensuring the safety of the control box and improving the reliability of the energy storage system.

[0049] There are n battery clusters, and all of them are connected to the battery cluster management module 3. Under the action of the control box main chip 2, the battery cluster management module 3 is controlled to collect information of each battery cell in different battery clusters, and to summarize and analyze the information in time. It can also perform flexible scheduling according to the state change of the battery cluster to ensure the stable operation of the battery cluster. There are m battery cells in each battery cluster, and n and m are both positive integers. When the battery cluster is in an overcharge or over-discharge state, the control box main chip 2 can realize the discharge or charge operation of the battery cluster by controlling the access or disconnection of the PCS. It can also call the air conditioning device to increase or decrease the temperature of the space where the battery cluster is located when the battery cluster is overheated. In addition, when a fire occurs in a dangerous situation in the battery cluster, the fire-fighting device is called in time to handle the abnormality. Among them, the fire-fighting device includes any one or more of a mobile fire-fighting device and a sprinkler device. It is used to carry out fire extinguishing in a corresponding manner according to the level of the dangerous situation.

[0050] A control method for a DC high-voltage control box for energy storage, the method is applied to the DC high-voltage control box for energy storage, the method comprises the following steps:

[0051] Step 1: Power on the control box;

[0052] Step 2: The control box main chip 2 obtains the real-time status information of the battery cluster, PCS, air conditioning device, and fire protection device, and stores it;

[0053] Step 3: The current diversion processing device compares and analyzes the current status information of the battery cluster in the control box main chip 2 with the preset standard status information of the battery cluster in the storage device to obtain a preliminary judgment on whether the battery cluster is currently abnormal.

[0054] Step 4: Based on the judgment result, the control box main chip 2 uploads the preliminary judgment result to the system management platform. After accurate judgment, the system management platform performs graded processing according to the abnormal cause of the battery cluster.

[0055] In step 2, the battery cluster information obtained by the control box main chip 2 includes any one or more of the current, voltage, and temperature of the battery cells in the battery cluster. The control box main chip 2 obtains PCS information including obtaining any one or more of the current, voltage, charge and discharge status, and power percentage in the PCS. The control box main chip 2 obtains air conditioning device information including any one or more of the air volume, air speed, air volume, air speed, temperature, and air conditioning device switch status. The fire protection device information obtained by the control box main chip 2 includes the switch status information of the fire protection device.

[0056] Through the method, the control box can more accurately regulate the output voltage and current parameters of each component, and it is also beneficial to reduce the cost of the control box and enhance the regulation efficiency of the control box.

[0057] Step three includes:

[0058] Step S31: sequentially number the m battery cells in the n battery clusters, each battery cell is denoted as Aij, i represents the battery cluster number of the battery cell, and j represents the row number of the battery cell in the same battery cluster, wherein 1≤i≤n, 1≤j≤m.

[0059] Step S32: The temperature information Tij of each battery cell in the battery cluster in the control box main chip 2 is retrieved by the shunting processing device, and the actual temperature variance value Si^2 of each battery cluster is calculated to be Si^2=[(T-Ti1

[0060] )^2+(T-Ti2)^2+...+(T-Tij)^2+...+(T-Tim)^2] / m; wherein T is the average temperature of the m battery cells in each battery cluster, that is, T=(Ti1+Ti2+...+Tij+...+Tim) / m.

[0061] Step S33: respectively determine whether the actual temperature variance value Si^2 of each battery cluster is greater than S0. If yes, the battery cluster is abnormal and step 4 is executed; if no, the battery cluster is normal and step 2 is returned. S0 is a preset battery cluster temperature variance value.

[0062] Through the setting of step three, the control box's preliminary judgment on the battery cluster can quickly pre-judge the real-time status of the battery cluster, which is beneficial to improving the control box's detection efficiency of whether the battery cluster has abnormalities, and is also beneficial to reducing the control cost of the control box and improving the control accuracy of the control box.

[0063] Step 4 includes:

[0064] Step S41: After the system management platform obtains the judgment result of the control box main chip 2 on the battery cluster, it recalculates the various information of the battery cluster detected by itself, and compares and judges whether the results are consistent. If yes, the control box is normal, and step S42 is executed; if no, the control box is abnormal, the control box is powered off, and the operator performs control box maintenance, and then returns to step 1;

[0065] Step S42: The system management platform re-labels the abnormal battery cluster as k, where k is a positive integer, 0≤k≤n; the system management platform determines whether U1≤the voltage value of each battery cell Ukj≤U2 in the k abnormal battery clusters one by one. If yes, the battery cell is normal, and the next battery cell is determined; if no, the battery cell is overcharged or over-discharged, and the control box main chip 2 controls the PCS access to charge or discharge the battery cell. Among them, U1 is the lowest value of the abnormal battery cell voltage, and U2 is the highest value of the abnormal battery cell voltage.

[0066] Through the re-judgment of the system management platform in step 4, the calculation error caused by the abnormality of the control box can be eliminated, which is beneficial to improve the accuracy of the control box control, and is also beneficial to speed up the detection of abnormal batteries and enhance the reliability and safety of the control box's regulation of various components.

[0067] In the present invention, any control box may include a DC high-voltage control box structure for energy storage described in this embodiment, and based on the relevant structures and assembly relationships of the shunt processing device and the monitoring device provided in this embodiment, the control box also includes conventional components including a box body 1, wires, switches and other structures; since they are all prior art, they will not be described in detail here.

[0068] 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, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A control method for a DC high voltage control box for energy storage, characterized in that: The method comprises the following steps: Step 1: Power on the control box; Step 2: The control box main chip (2) obtains and stores the real-time status information of the battery cluster, PCS, air conditioning device, and fire protection device; Step 3: The current diversion processing device compares and analyzes the current status information of the battery cluster in the control box main chip (2) with the preset standard status information of the battery cluster in the storage device to obtain a preliminary judgment on whether the battery cluster is currently abnormal; Step 4: Based on the judgment result, the control box main chip (2) uploads the preliminary judgment result to the system management platform. After accurate judgment, the system management platform performs graded processing according to the abnormal cause of the battery cluster.

2. The control method of a DC high voltage control box for energy storage according to claim 1, characterized in that: The step three comprises: Step S31: sequentially label the m battery cells in the n battery clusters, and each battery cell is denoted as Aij; Step S32: retrieve the temperature information Tij of each battery cell in the battery cluster in the control box main chip (2) through the shunting processing device, and calculate the actual temperature variance value Si^2 of each battery cluster = [(T-Ti1)^2+(T-Ti2)^2+...+(T-Tij)^2+...+(T-Tim)^2] / m; Step S33: determine whether the actual temperature variance value Si^2 of each battery cluster is greater than S0. If yes, the battery cluster is abnormal and step 4 is executed; if no, the battery cluster is normal and the process returns to step 2.

3. The control method of a DC high voltage control box for energy storage according to claim 2 is characterized in that: The T is the average temperature of m battery cells in each battery cluster, that is, T=(Ti1+Ti2+...+Tij+...+Tim) / m.

4. The control method of a DC high voltage control box for energy storage according to claim 2, characterized in that: The S0 is a preset battery cluster temperature variance value.

5. The control method of a DC high voltage control box for energy storage according to claim 2, characterized in that: The i represents the battery cluster number of the battery cell, and j represents the row number of the battery cell in the same battery cluster; wherein 1≤i≤n, 1≤j≤m.

6. A DC high voltage control box for energy storage, characterized in that: The control box applies a control method for a DC high-voltage control box for energy storage as described in any one of claims 1 to 5, wherein the control box comprises a box body (1), a control box main chip (2), a battery cluster management module (3), an isolation module (4), and a DC / DC conversion device (5), wherein the control box main chip (2), the battery cluster management module (3), the isolation module (4), and the DC / DC conversion device (5) are all arranged inside the box body (1), the control box main chip (2) is respectively connected to one end of the battery cluster management module (3), the isolation module (4), and the DC / DC conversion device (5), the other ends of the battery cluster management module (3) and the isolation module (4) are connected in parallel and then connected to the battery cluster, and the other end of the DC / DC conversion device (5) is connected to other components required to be controlled by the control box.

7. A DC high voltage control box for energy storage according to claim 6, characterized in that: The other components include any one or more of a PCS, an air conditioning device, and a fire fighting device.

8. A DC high voltage control box for energy storage according to claim 7, characterized in that: The control box further comprises a protection module (6), which is arranged in the box body (1) and between the control box main chip (2) and the battery cluster management module (3).

9. A DC high voltage control box for energy storage according to claim 8, characterized in that: The protection module (6) adopts a protection circuit including any one or more components of a fuse, a relay, and a circuit breaker.

10. A DC high voltage control box for energy storage according to claim 7, characterized in that: The control box also includes a storage device, a flow distribution processing device and a monitoring device, and the storage device, the flow distribution processing device and the monitoring device are all connected to the control box main chip (2).

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