Energy storage battery cluster energy management equipment and method

Abstract

The invention provides energy management equipment and method for an energy storage battery cluster, and the equipment comprises a battery cabinet, a battery, a battery management device, and an energy storage converter PCS, a battery module is disposed in the battery cabinet, the battery module is connected with the battery management device, the energy storage converter PCS, and a power grid through the battery cabinet, and the battery cabinet comprises a cabinet inner shell, a cabinet outer shell, and a cabinet door. The cabinet inner shell is arranged on the inner side of the cabinet outer shell, the left side of the cabinet door is hinged to the cabinet outer shell, the right side of the cabinet door is movably connected with or separated from the cabinet outer shell, a first cavity is formed among the cabinet inner shell, the cabinet outer shell and the cabinet door, and a phase-change material base body and a water pipe are arranged in the first cavity; according to the energy management equipment and method for the energy storage battery cluster, the adaptability of the battery cluster in the environment with the large temperature change amplitude can be effectively improved, the safety and stability of the equipment are enhanced, the cost of the equipment is reduced, the service life of the equipment is prolonged, the heat dissipation capacity in the battery cluster is improved, and the service life of the equipment is prolonged. And the operation stability in the battery cluster is enhanced.

Description

Technical Field

[0001] The present invention relates to the field of energy storage, and in particular to an energy storage battery cluster energy management device and method. Background Art

[0002] In a battery energy storage system, multiple battery cells can form a battery stack. Multiple battery stacks can form a battery cluster, which is usually used in large energy storage systems. Battery clusters connect multiple battery stacks together through connectors to form a larger capacity energy storage unit. However, in existing battery clusters, in order to reduce space occupation, a large number of battery clusters are often arranged in a compact manner, which easily leads to problems such as poor balance and heat dissipation of the battery cluster.

[0003] In addition, the consistency problem within the battery cluster refers to the differences in voltage, capacity, internal resistance, etc. between different battery cells, which leads to inconsistent performance of different battery cells during the charging process. Due to the consistency problem of battery cells during the battery charging process, it is easy for some battery cells in the battery cluster to trigger the overvoltage or overcurrent protection mechanism prematurely during charging and stop charging, while other battery cells are in a state where they can continue to charge. However, due to the protection mechanism, the power of other battery cells cannot continue to increase, which affects the charging power of the entire battery cluster, and further affects the energy utilization rate of the energy storage power station. Therefore, it is of great significance to solve the inconsistency of batteries within the battery cluster on the premise of improving the adaptability of the battery cluster to the environment.

[0004] In patent publication number CN118213663A, a liquid cooling device for a container energy storage system and a temperature balance control method thereof, a liquid cooling device for a container energy storage system and a temperature balance control method thereof are mentioned. In view of the inconsistency of temperature distribution and the inability to balance control during the charging and discharging process of the energy storage system in the prior art, a liquid cooling device is used to send control instructions to the temperature sensor and controller of each battery pack through the main control unit of the high-voltage box battery management system in each cluster, and the opening and closing degree of the electronic expansion valve is controlled to increase or decrease the flow of coolant flowing through the corresponding battery pack, and maintain the pressure difference between the high-pressure side and the low-pressure side of the system, so as to achieve the purpose of dynamically adjusting the temperature of the battery cell, and finally realize the balanced control of the temperature of the entire energy storage container, so as to minimize the temperature rise and temperature difference, ensure the temperature field balance of the container energy storage system, and extend the service life; however, the system structure of this method is relatively complex and the cost is relatively high. Summary of the invention

[0005] In view of this, the present invention aims to propose an energy management device and method for an energy storage battery cluster, so as to solve the problems existing in the prior art that the system structure of the battery cluster energy management device is relatively complex, the cost is relatively high, and the batteries are relatively tightly dispersed, which easily leads to poor battery balancing and heat dissipation effects, as well as the problem that the inconsistency of battery cells in the battery cluster cannot be adjusted; thereby effectively improving the adaptability of the battery cluster in an environment with a large temperature change range, achieving the consistency of the batteries in the battery cluster, enhancing the safety and stability of the equipment, reducing the cost of the equipment, extending the service life of the equipment, improving the heat dissipation capacity within the battery cluster, and enhancing the stability of operation within the battery cluster.

[0006] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0007] The present invention relates to an energy storage battery cluster energy management device and method. The energy storage battery cluster energy management device comprises a battery cabinet, a battery, a battery management device, and an energy storage converter PCS. A battery module is arranged in the battery cabinet. The battery module is respectively connected to the battery management device, the energy storage converter PCS, and a power grid through the battery cabinet. The battery cabinet comprises a cabinet inner shell, a cabinet outer shell, and a cabinet door. The cabinet inner shell is arranged on the inner side of the cabinet outer shell. The left side of the cabinet door is hinged to the cabinet outer shell. The right side of the cabinet door is connected to or separated from the cabinet outer shell in a movable manner. A first cavity is formed between the cabinet inner shell, the cabinet outer shell, and the cabinet door. A phase change material matrix and a water pipe are arranged in the first cavity. The battery modules are arranged in n×m numbers, where n and m are both positive integers. After every n battery modules are arranged in series and / or in parallel, a battery cluster is formed. The n battery modules in each battery cluster are arranged in a linear arrangement inside the battery cabinet. The m battery clusters are arranged in series and / or in parallel, and the m battery clusters are arranged in a linear arrangement. By configuring the device, the safety and stability of the device can be enhanced, the cost of the device can be reduced, the service life of the device can be extended, the heat dissipation capacity within the battery cluster can be improved, and the operation stability within the battery cluster can be enhanced.

[0008] Furthermore, the battery module is connected to the battery management device, the energy storage converter PCS, and the power grid through the electronic switch assembly; the electronic switch assembly is provided with n×m, and the n×m electronic switch assemblies are connected to the n×m battery modules one by one; the battery cabinet is provided with a backup power interface, a control interface, and a main power interface, and the backup power interface, the control interface, and the main power interface are respectively set on the cabinet door; the power input end of the electronic switch assembly is connected to the energy storage converter PCS, the battery management device, and the power grid through the backup power interface, the control interface, and the main power interface; the battery management device includes a main control chip, a processor, a memory, and a collector, and the main control chip is connected to the processor, the memory, and the collector respectively. The setting of the electronic switch is conducive to improving the service life of the electronic switch, reducing the power consumption of the electronic switch, and enhancing the flexibility of the electronic switch setting.

[0009] A management method for an energy storage battery cluster energy management device, the method is applied to the energy storage battery cluster energy management device, the method comprises the following steps:

[0010] Step 1: Numbering: Number the battery modules in the battery cabinet separately and group them;

[0011] Step 2: Manage the internal energy of the battery module according to the real-time monitoring information;

[0012] Step 3: Manage the temperature of the battery cells in the battery module according to the real-time monitoring information. By setting the method, the dual management of the battery power state and the temperature of the battery cells can help improve the accuracy of the equipment's battery cluster energy management, reduce the occurrence of errors, and improve the reliability of battery cluster energy management.

[0013] Compared with the prior art, the energy storage battery cluster energy management device and method described in the present invention have the following beneficial effects:

[0014] Through the device, the adaptability of the battery cluster in an environment with a large temperature change can be effectively improved, the consistency of the batteries in the battery cluster can be achieved, and the problem of inconsistent performance of different battery cells during the charging and discharging process can be avoided, the safety and stability of the equipment can be enhanced, the cost of the equipment can be reduced, the service life of the equipment can be extended, the heat dissipation capacity within the battery cluster can be improved, and the stability of operation within the battery cluster can be enhanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] 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.

[0016] In the figure:

[0017] Figure 1It is a schematic diagram of the overall structure of the equipment;

[0018] Figure 2 It is a schematic diagram of the structure of the left water pipe and phase change material in the first cavity of the device;

[0019] Figure 3 It is a schematic diagram of the management method flow chart.

[0020] Explanation of the accompanying drawings: 1. Battery cabinet; 11. Cabinet inner shell; 12. Cabinet outer shell; 13. Cabinet door; 14. Backup power supply interface; 15. Management and control interface; 16. Main power supply interface; 2. Battery module; 3. Battery management device; 4. Energy storage inverter PCS; 5. Power grid. DETAILED DESCRIPTION

[0021] 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.

[0022] 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.

[0023] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0024] In order to solve the problems in the prior art that the system structure of the battery cluster energy management device is relatively complex, the cost is high, and the batteries are relatively closely dispersed, which easily leads to poor battery balancing and heat dissipation effects, as well as the problem that the inconsistency of battery cells in the battery cluster cannot be adjusted; this embodiment proposes an energy storage battery cluster energy management device and method, the device includes a battery cabinet 1, a battery module 2, a battery management device 3, and an energy storage inverter PCS4. The battery module 2 is arranged in the battery cabinet 1. The battery module 2 is connected to the battery management device 3, the energy storage inverter PCS4, and the power grid 5 through the battery cabinet 1. The battery management device 3 is connected to the power grid 5 through the power grid 5. The real-time operation status of the battery module 2 is monitored and analyzed, and the energy storage converter PCS4 and / or the power grid 5 are controlled to supply power to the battery module 2. The battery cabinet 1 includes an inner cabinet shell 11, an outer cabinet shell 12, and a cabinet door 13. The inner cabinet shell 11 is arranged on the inner side of the cabinet shell 12. The left side of the cabinet door 13 is hinged to the cabinet shell 12. The right side of the cabinet door 13 is connected or separated from the cabinet shell 12 in a movable manner. A first cavity is formed between the inner cabinet shell 11, the cabinet shell 12, and the cabinet door 13. A phase change material matrix and a water pipe are arranged in the first cavity to facilitate the dual action of the phase change material and the water pipe to avoid the battery module 2 from being affected by the rise and fall of the external environment temperature. In this embodiment, the water pipes are evenly distributed in the first cavity, and the box-change material matrix is ​​distributed outside the water pipes in the first cavity. The water pipe includes a water inlet and a water outlet. The water inlet and the water outlet of the water pipe are connected to the water tank at the bottom of the battery cabinet 1 for circulating water supply.

[0025] Through the setting of the device, the adaptability of the battery cluster in an environment with a large temperature change can be effectively improved, the consistency of the batteries in the battery cluster can be achieved, the safety and stability of the equipment can be enhanced, the cost of the equipment can be reduced, the service life of the equipment can be extended, the heat dissipation capacity within the battery cluster can be improved, and the stability of operation within the battery cluster can be enhanced.

[0026] The battery modules 2 are arranged in n×m numbers, where n and m are both positive integers. After every n battery modules 2 are arranged in series and / or in parallel, a battery cluster is formed. There are m battery clusters. The n battery modules 2 in each battery cluster are arranged in a linear arrangement inside the battery cabinet 1. The m battery clusters are connected in series and / or in parallel with each other, and the m battery clusters are arranged in a linear arrangement, which is used to reduce the floor space of the battery cabinet 1 and facilitate the transportation and installation of the battery cabinet 1. The battery modules 2 in the m battery clusters are distributed in the form of an m×n matrix; wherein the matrix is ​​an m×n matrix, m is the number of rows, and n is the number of columns. The battery modules 2 are connected to the battery management device 3, the energy storage converter PCS4, and the power grid 5 respectively through the electronic switch assembly, and the electronic switch assembly can realize the function of connecting the corresponding battery module 2 to the battery cluster or isolating and disconnecting it. There are n×m electronic switch assemblies, and the n×m electronic switch assemblies are connected to the n×m battery modules 2 one by one. The electronic switch assembly includes a main electronic switch, a main resistor and a bypass electronic switch. The main electronic switch is connected to the positive electrode of the battery module 2 through the main resistor. The negative electrode of the battery module 2 is respectively connected to the adjacent battery module 2 and / or one end of the bypass electronic switch. The other end of the bypass electronic switch is connected in parallel with the end of the main electronic switch away from the main resistor, and then connected to the adjacent battery module 2. The main electronic switch, the main resistor and the bypass electronic switch are all set in n×m. In this embodiment, the connection mode between the n×m battery modules 2 is specifically set as required. The main electronic switch and the bypass electronic switch are both bidirectional thyristor electronic switches.

[0027] Through the connection between each battery module 2, the flexibility of battery setting in the battery cluster can be effectively enhanced. It is also beneficial that when an abnormality occurs in different battery modules 2, the abnormal battery module 2 can be disconnected in time through the battery management device 3, and a normal backup battery can be connected to maintain the overall power of the battery cluster. Through the setting of the electronic switch, it is beneficial to improve the service life of the electronic switch, reduce the power consumption of the electronic switch, and enhance the flexibility of the electronic switch setting.

[0028] The battery cabinet 1 is provided with a backup power interface 14, a control interface 15, and a main power interface 16. The backup power interface 14, the control interface 15, and the main power interface 16 are respectively arranged on the cabinet door 13 to facilitate the connection between the battery module 2 and other components in the device. The power input end of the electronic switch component corresponding to the battery module 2 is connected to the energy storage inverter PCS4, the battery management device 3, and the power grid 5 through the backup power interface 14, the control interface 15, and the main power interface 16. In addition, a second cavity is formed between the cabinet inner shell 11 and the cabinet door 13 of the battery cabinet 1. The battery module 2 is arranged in the second cavity to protect the battery module 2, isolate the phase change material from the battery module 2, and provide a stable installation space for the battery module 2. In addition, a fan can also be arranged in the battery cabinet 1 to cool down the temperature when the temperature in the second cavity is too high, thereby protecting the battery module 2 and preventing the occurrence of danger.

[0029] By setting the backup power interface 14, the management interface 15, and the main power interface 16 on the cabinet door 13, it is beneficial to avoid affecting the airtightness of the first cavity inside the battery cabinet 1, improve the control of the battery temperature by the phase change material, reduce the consumption of electric energy, extend the service life of the battery, and improve the impact of the battery on the rapid changes in ambient temperature.

[0030] The battery management device 3 includes a main control chip, a processor, a memory, and a collector. The main control chip is connected to the processor, the memory, and the collector respectively. The collector is used for real-time status information of each battery module 2 and uploads it to the main control chip. Under the action of the main control chip, the processor processes and analyzes it, stores the processing results in the memory, and issues instructions through the collector to control the electronic switch component to connect or disconnect the abnormal battery module 2. Among them, the status information includes any one or more information of the current, voltage, and temperature of the battery module 2.

[0031] The setting of the battery management device 3 is beneficial to improving the management efficiency of the equipment for each battery module 2, enhancing the abnormal prevention of the battery module 2, enhancing the operational reliability and stability of the battery module 2, and also beneficial to ensuring the operational safety and adjustment flexibility of the battery module 2, thereby extending the service life of the battery module 2.

[0032] A management method for an energy storage battery cluster energy management device, the method is applied to the energy storage battery cluster energy management device, the method comprises the following steps:

[0033] Step 1: Numbering: Number the battery modules 2 in the battery cabinet 1 respectively and group them;

[0034] Step 2: manage the internal energy of the battery module 2 according to the real-time monitoring information;

[0035] Step 3: manage the temperature of the battery cells in the battery module 2 according to the real-time monitoring information.

[0036] Step one includes:

[0037] Step S11: numbering each battery module 2 accordingly according to the arrangement order of the n battery modules 2 in an m×n matrix in the battery cabinet 1;

[0038] Step S12: grouping the numbered battery modules 2 in rows / columns; when grouping in rows, the number of groups is m, and when grouping in columns, the number of groups is n.

[0039] Step 2 includes:

[0040] Step S21: real-time monitoring and analysis: according to the data of each battery module 2 monitored in real time in the battery management device 3, the total energy value of each group of battery modules 2 is calculated, and the energy curve of each group of battery modules 2 corresponding to the group is drawn;

[0041] Step S22: Correction: Correcting the energy curves of different groups;

[0042] Step S23: Determine abnormality by group: compare the corrected energy curve of the battery module 2 of the selected group with the preset energy curve f0 to determine whether the battery module 2 of the current group is abnormal. If yes, execute step S24; if no, select the energy curve of the battery module 2 of the next group and repeat step S23;

[0043] Step S24: Accurate judgment and processing: Analyze all battery modules 2 in the abnormal group to determine whether the energy value Socmn of each battery module 2 is between the preset energy range Soc1-Soc2. If yes, judge the next battery. If not, judge the cause of the abnormal battery module 2 and process it.

[0044] Through the method, it is possible to effectively achieve accurate positioning of the battery module 2 in the battery stack by first making a preliminary judgment and then making an accurate judgment, thereby avoiding the occurrence of misjudgment, which is beneficial to improving the accuracy and reliability of equipment management and improving the stability and safety of battery stack operation.

[0045] Step S23 includes:

[0046] Step S231: preset a standard energy curve f0;

[0047] Step S232: set m=1 or n=1;

[0048] Step S233: Selecting the energy curve fm / n of the battery module 2 of the m / nth group;

[0049] Step S234: compare fm / n and f0 to determine whether the battery module 2 of the current group is abnormal. If yes, execute step S24; if no, execute step S235;

[0050] Step S235: Let m=m+1 or n=n+1, and determine whether m>n / n or n>n / m? If yes, all the battery modules 2 in the battery cabinet 1 are normal at the current time, and the process returns to step 2 to monitor the status of the battery modules 2 in the next time period; if no, the process returns to step S233 to determine the abnormality of the next group of battery modules 2. It should be noted that m or n on the left side of the equal sign represents a variable, and n / n and n / m represent the total number of rows or columns, respectively, which are both numbers and have no other suggestive meanings.

[0051] By grouping the battery modules 2 in step 1, the efficiency of screening abnormal battery modules 2 is improved, and confusion is avoided. The preliminary screening of abnormal battery modules 2 in step S23 is helpful to reduce the workload of judging abnormal battery modules 2.

[0052] Step S24 includes:

[0053] Step S241: Analyze all battery modules 2 in the abnormal group, setting n=1 or m=1;

[0054] Step S242: determine whether the energy value Socmn of each battery module 2 is within the preset energy range Soc1-Soc2, if yes, execute step S243; if no, execute step S244;

[0055] Step S243: Let n=n+1 or m=m+1, and determine whether n>n / m or m>n / n? If yes, all battery modules 2 in the current abnormal group are normal, and return to step 2; if no, return to step S242, and perform abnormal determination on the next battery module 2 in the current group;

[0056] Step S244: Determine whether the screened abnormal battery module 2 has Socmn<Soc1. If so, the energy value of the battery module 2 is low, and the battery management device 3 sends a battery isolation and power supply instruction, charges the isolated battery through the power grid 5, and performs an equivalent replacement of the battery through the energy storage inverter PCS4 until the battery module 2 is normally connected. If not, the energy value of the battery module 2 is high, and the battery management device 3 sends a battery isolation and discharge instruction, discharges the isolated battery through the power grid 5, and performs an equivalent replacement of the battery through the energy storage inverter PCS4 until the battery module 2 is normally connected.

[0057] By judging the battery modules 2 in the abnormal group one by one and performing corresponding processing, it is beneficial to improve the flexibility of battery stack adjustment, improve the operating stability of the battery stack, enhance the safety factor of the battery stack, and also help to extend the service life of the battery stack.

[0058] Step three includes:

[0059] Step S31: Calculate the temperature standard deviation S in each battery cluster based on the detected temperature information of the n battery modules 2 in each battery cluster. T ;

[0060] Step S32: Compare the temperature difference values ​​S of different battery clusters T and the preset upper limit T1 of the standard temperature in the battery cluster to determine whether S T >T1? If yes, open the water inlet of the water pipe through the battery management device 3 to perform primary cooling of the battery cabinet 1; if no, use phase change material to cool down and execute step S33;

[0061] Step S33: Compare whether the temperature value of each battery in the abnormal battery cluster is greater than the upper limit value t0 of the preset battery temperature standard value. If yes, turn on the fan corresponding to the battery module 2 through the battery management device 3 to perform accurate triple cooling to ensure the operation safety in the battery cluster; if no, judge the abnormal temperature of the battery module 2 in the next group of abnormal battery clusters, and perform corresponding processing until the processing is completed, and return to step S31. In this embodiment, the specific values ​​of Soc1, Soc2, T1, and t0 are set according to the needs.

[0062] The configuration of step three is helpful to improve the management and scheduling of each battery module 2 in the battery cluster by the battery management device 3, and is helpful to prevent excessive temperature from affecting the service life of the battery. In addition, the triple functions of phase change materials, water pipes and fans are helpful to improve the stability of the equipment, enhance the safety of the equipment, and ensure the safety of personnel.

[0063] 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. An energy storage battery cluster energy management device, It is characterized in that The invention comprises a battery cabinet (1), a battery (2), a battery management device (3), and an energy storage converter PCS (4). A battery module (2) is arranged in the battery cabinet (1). The battery module (2) is connected to the battery management device (3), the energy storage converter PCS (4), and a power grid (5) through the battery cabinet (1). The battery cabinet (1) comprises an inner cabinet shell (11), an outer cabinet shell (12), and a cabinet door (13). The inner cabinet shell (11) is arranged on the inner side of the cabinet shell (12). The left side of the cabinet door (13) is hinged to the cabinet shell (12). The right side of the cabinet door (13) is connected to or separated from the cabinet shell (12) in a movable manner. A first cavity is formed between the inner cabinet shell (11), the outer cabinet shell (12), and the cabinet door (13). A phase change material matrix and a water pipe are arranged in the first cavity.

2. An energy storage battery cluster energy management device according to claim 1, It is characterized in that The battery modules (2) are arranged in n×m numbers, where n and m are both positive integers, and every n battery modules (2) are arranged in series and / or in parallel to form a battery cluster.

3. An energy storage battery cluster energy management device according to claim 2, It is characterized in that The n battery modules (2) in each battery cluster are arranged in a linear arrangement inside the battery cabinet (1).

4. An energy storage battery cluster energy management device according to claim 3, It is characterized in that The number of battery clusters is m, and the m battery clusters are connected in series and / or in parallel with each other, and the m battery clusters are arranged in a linear manner.

5. The energy management device for energy storage battery cluster according to claim 2, It is characterized in that The battery module (2) is respectively connected to the battery management device (3), the energy storage converter PCS (4), and the power grid (5) through an electronic switch assembly.

6. The energy storage battery cluster energy management device according to claim 5, It is characterized in that The electronic switch components are arranged in n×m numbers, and the n×m electronic switch components are connected to the n×m battery modules (2) in a one-to-one correspondence.

7. The energy management device for energy storage battery cluster according to claim 6, It is characterized in that The battery cabinet (1) is provided with a backup power supply interface (14), a control interface (15), and a main power supply interface (16); the backup power supply interface (14), the control interface (15), and the main power supply interface (16) are respectively arranged through the cabinet door (13).

8. An energy storage battery cluster energy management device according to claim 7, It is characterized in that The power input end of the electronic switch assembly is connected to the energy storage converter PCS (4), the battery management device (3) and the power grid (5) respectively through the backup power interface (14), the control interface (15) and the main power interface (16).

9. The energy storage battery cluster energy management device according to claim 2, It is characterized in that The battery management device (3) comprises a main control chip, a processor, a memory, and a collector, and the main control chip is connected to the processor, the memory, and the collector respectively.

10. A management method for an energy storage battery cluster energy management device, It is characterized in that The method is applied to an energy storage battery cluster energy management device according to any one of claims 1 to 9, and the method comprises the following steps: Step 1: Numbering: Numbering the battery modules (2) in the battery cabinet (1) respectively and grouping them; Step 2: managing the internal energy of the battery module (2) according to the real-time monitoring information; Step 3: managing the temperature of the battery cells in the battery module (2) according to the real-time monitoring information.

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