Battery cabinet and multi-cluster parallel system

Abstract

The invention discloses a battery cabinet and a multi-cluster parallel system, and relates to the technical field of battery cabinet intelligent control, the battery cabinet comprises a controller, a conduction switching circuit and a plurality of battery modules arranged in series; the first ends of the plurality of battery modules which are arranged in series are connected to a load or a power supply through the conduction switching circuit; the controller is connected to the first end, the second end and the control end of the conduction switching circuit; the controller is also used for detecting a first voltage at a first end position of the conduction switching circuit and a second voltage at a second end position of the conduction switching circuit; and the controller is also used for disconnecting the battery module and a load or a power supply when the voltage difference between the first voltage and the second voltage is greater than a preset threshold value. Therefore, under the condition that the battery module fails, the connection between the failed battery module and the power supply or the load can be directly disconnected, so that the influence on the battery modules in other battery cabinets is avoided.

Description

Technical Field

[0001] This application relates to the field of intelligent control technology for battery cabinets, and in particular to a battery cabinet and a multi-cluster parallel system. Background Technology

[0002] In the early development stages of multi-cluster parallel battery cabinet energy storage systems, traditional contactor solutions had significant limitations in system architecture design due to the limitations of the technology and design concepts at the time. Their charging and discharging links adopted an overall on / off mode, making it impossible to achieve independent control of the charging and discharging processes. This not only resulted in insufficient control precision and reduced the system's ability to manage different battery clusters in a refined manner, but also significantly reduced the system's operational flexibility and response speed, making it difficult to meet the requirements for precise control of the battery cabinet under complex operating conditions.

[0003] When multiple battery clusters are connected in parallel, traditional solutions struggle to meet the independent charging and compensation needs of each cluster, resulting in poor balance in the end battery pack and highlighting the overall system performance bottleneck. Because precise energy management of each battery cluster is impossible, the differences in state of charge (SOC) and state of health (SOH) between different clusters gradually widen. Some batteries may remain in an undercharged or over-discharged state for extended periods, accelerating battery aging, shortening battery life, and consequently affecting the capacity utilization and power output of the entire energy storage system. This limits the system's expansion and application potential in high-performance application scenarios.

[0004] Traditional systems often exhibit a passive approach to fault handling, lacking effective tiered alarm and fault isolation mechanisms. A failure in one battery cluster can impact the entire system, expanding the alarm reach and severely impacting system stability. For instance, during battery cabinet operation, if a battery cluster experiences a sudden failure such as a short circuit or overheating, the entire system may immediately shut down, unable to maintain some functions until manual intervention is required. This significantly affects the system's ability to operate continuously and stably, increasing maintenance costs and downtime. Summary of the Invention

[0005] The main purpose of this application is to provide a battery cabinet and a multi-cluster parallel system, which aims to solve the technical problem that when a conventional battery cabinet uses ordinary contactors, the entire system needs to be cut off when any charging or discharging link alarms, resulting in reduced system availability.

[0006] To achieve the above objectives, this application proposes a battery cabinet, which includes: a controller, a switching circuit, and multiple battery modules arranged in series;

[0007] The first end of the multiple battery modules arranged in series is connected to a load or power source through the switching circuit, and the second end of the multiple battery modules arranged in series is connected to a load or power source; the controller is connected to the first end, the second end and the control end of the switching circuit.

[0008] The controller is also used to detect a first voltage at the first terminal position and a second voltage at the second terminal position of the switching circuit.

[0009] The controller is also configured to send a stop operation signal to the conduction switching circuit when the voltage difference between the first voltage and the second voltage is greater than a preset threshold.

[0010] The switching circuit is used to disconnect the battery module from the load or power source in response to the stop signal.

[0011] Optionally, the switching circuit further includes: a discharge contactor;

[0012] The discharge contactor is connected to the controller, the battery module, and the load, respectively.

[0013] The controller is also used to output a discharge signal to the switching circuit when a load is connected to the switching circuit;

[0014] The discharge contactor is used to connect the battery module to the load when a discharge signal is received, so as to enable the battery module to discharge to the load.

[0015] Optionally, the discharge contactor includes: a first contactor and a first diode;

[0016] The first end of the first contactor is connected to the negative terminal of the first diode, the second end of the first contactor is connected to the load, and the positive terminal of the first diode is connected to the battery module and the controller, respectively.

[0017] Optionally, the switching circuit includes: a charging contactor;

[0018] The charging contactor is connected to the controller, the battery module, and the power source, respectively.

[0019] The controller is also used to output a charging signal to the switching circuit when the switching circuit is connected to a power source;

[0020] The charging contactor is used to connect the battery module to the power source when it receives a charging signal, so as to enable the power source to charge the battery module.

[0021] Optionally, the charging contactor includes: a second contactor and a second diode;

[0022] The first end of the second contactor is connected to the battery module and the controller respectively, the second end of the second contactor is connected to the negative terminal of the second diode respectively, and the positive terminal of the second diode is connected to the power supply respectively.

[0023] Optionally, the battery cabinet further includes: a pre-charging circuit;

[0024] The pre-charging circuit is connected to the power supply, the controller, and the battery module, respectively.

[0025] The controller is also configured to send a pre-charge signal to the pre-charge circuit;

[0026] The pre-charging circuit is used to pre-charge the battery module through the power supply when a pre-charging signal is received.

[0027] Optionally, the pre-charging circuit includes: a third contactor and a first resistor;

[0028] The first end of the first resistor is connected to the battery module and the controller respectively, the second end of the first resistor is connected to the first end of the third contactor, and the second end of the third contactor is connected to the power supply respectively.

[0029] Optionally, the battery cabinet further includes: a voltage conversion module;

[0030] The voltage conversion module is connected to the battery module, the switching circuit and the controller respectively;

[0031] The voltage conversion module is used to convert the AC voltage signal of the power supply into a DC voltage signal and send it to the battery module when the battery module is connected to the power supply.

[0032] Optionally, the battery cabinet further includes: a current detection module;

[0033] The current detection module is connected to the battery module, the switching circuit and the controller respectively;

[0034] The current detection module is used to detect the current during the charging and discharging of the battery module and send it to the controller;

[0035] The controller is configured to send a stop signal to the switching circuit when the current is greater than a preset current, so as to stop the switching circuit from operating.

[0036] In addition, to achieve the above objectives, this application also proposes a multi-cluster parallel system, which includes a switch, a multi-cluster parallel module, and a battery cabinet as described above.

[0037] The switch is connected to the multi-cluster parallel module, the controller in each battery cabinet, and the conduction switching circuit.

[0038] One or more technical solutions proposed in this application have at least the following effects:

[0039] This application discloses a battery cabinet and a multi-cell parallel system. The battery cabinet includes a controller, a switching circuit, and multiple battery modules connected in series. The first end of each battery module is connected to a load or power source via the switching circuit, and the second end of each battery module is also connected to the load or power source. The controller is connected to the first end, the second end, and a control terminal of the switching circuit. The controller is further configured to detect a first voltage at the first end and a second voltage at the second end of the switching circuit. The controller is also configured to send a stop signal to the switching circuit when the voltage difference between the first and second voltages exceeds a preset threshold. The switching circuit disconnects the battery modules from the load or power source in response to the stop signal. The controller can monitor the voltage difference across the switching circuit in real time. When the voltage difference exceeds the preset threshold, it quickly sends a stop signal, causing the switching circuit to disconnect the battery modules from the load or power source. Therefore, in the event of a battery module failure, the connection between the faulty battery module and the power source or load can be directly disconnected, thus avoiding impact on battery modules in other battery cabinets. Through the controller's monitoring and control functions, the system can respond quickly and disconnect in abnormal situations, thereby improving the overall system safety. This design reduces the risk of accidents caused by battery failure, ensuring the safety of equipment and personnel. The coordinated operation of the controller and the switching circuit enables intelligent control of the battery cabinet, optimizing the battery charging and discharging process and improving system stability and reliability. This intelligent control system facilitates refined management of the battery cabinet, enhancing overall system performance. When a battery module or switching circuit fails, the system can promptly isolate the faulty part, preventing the fault from spreading to other battery modules or the entire system, reducing the impact of the fault on system operation. Through effective voltage monitoring and fault isolation mechanisms, the system can maintain the normal operation of other parts even when some components malfunction, improving system availability and continuous operation capability. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 This is a schematic diagram of the structure of the first embodiment of the battery cabinet proposed in this application;

[0042] Figure 2 This is a schematic diagram of the structure of the second embodiment of the battery cabinet proposed in this application;

[0043] Figure 3 This is a circuit diagram of the second embodiment of the battery cabinet proposed in this application.

[0044] Figure 4 This is a schematic diagram of the structure of the multi-cluster parallel system of this application;

[0045] Figure 5 This is a flowchart of the power-on process for the multi-cluster parallel system of this application.

[0046] Explanation of icon numbers:

[0047] label name label name 1 controller 2 Battery Module 2 3 On / off switching circuit 31 Discharge contactor 32 Charging contactor 4 Pre-charging circuit 5 Voltage conversion module 6 Current detection module KM1 First contactor KM2 Second contactor KM3 Third contactor D1 First diode D2 Second diode R First resistor

[0048] The purpose, features, and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0049] It should be understood that the specific embodiments described herein are only used to explain the technical solutions of this application and are not intended to limit this application.

[0050] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0051] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0052] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0053] The main solution of this application embodiment is that the controller 1 can monitor the voltage difference across the switching circuit 3 in real time. When the voltage difference exceeds a preset threshold, it quickly sends a stop signal to disconnect the battery module 2 from the load or power supply. When a battery module 2 or the switching circuit 3 fails, the system can isolate the faulty part in time to prevent the fault from spreading to other battery modules 2 or the entire system, thus reducing the impact of the fault on the system operation.

[0054] This application provides a solution, disclosing a battery cabinet and a multi-cluster parallel system. The battery cabinet includes: a controller 1, a switching circuit 3, and multiple battery modules 2 connected in series. The first end of each battery module 2 is connected to a load or power source via the switching circuit 3, and the second end of each battery module 2 is also connected to the load or power source. The controller 1 is connected to the first end, the second end, and a control terminal of the switching circuit 3. The controller 1 is further configured to detect a first voltage at the first end and a second voltage at the second end of the switching circuit 3. The controller 1 is also configured to send a stop signal to the switching circuit 3 when the voltage difference between the first and second voltages exceeds a preset threshold. The switching circuit 3 disconnects the battery modules 2 from the load or power source in response to the stop signal. The controller 1 can monitor the voltage difference across the switching circuit 3 in real time, and when the voltage difference exceeds the preset threshold, it quickly sends a stop signal, causing the switching circuit 3 to disconnect the battery modules 2 from the load or power source. In the event of a battery module failure, the connection between the faulty battery module and the power supply or load can be directly disconnected, thus preventing impact on battery modules in other battery cabinets. Through the monitoring and control functions of controller 1, the system can respond quickly in abnormal situations and disconnect connections promptly, thereby improving the safety of the entire system. This design reduces the risk of accidents caused by battery failures, ensuring the safety of equipment and personnel. The collaborative work of controller 1 and the switching circuit 3 enables intelligent control of the battery cabinet, optimizing the battery charging and discharging process and improving the stability and reliability of the system. This intelligent control system facilitates refined management of the battery cabinet and enhances the overall performance of the system. When a battery module 2 or the switching circuit 3 fails, the system can promptly isolate the faulty part, preventing the fault from spreading to other battery modules 2 or the entire system, reducing the impact of the fault on system operation. Through effective voltage monitoring and fault isolation mechanisms, the system can maintain the normal operation of other parts even when some components malfunction, improving the system's availability and continuous operation capability.

[0055] Based on this, this application provides a battery cabinet.

[0056] refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of the first embodiment of the battery cabinet proposed in this application.

[0057] Considering. For example. Figure 1 As shown, the battery cabinet in this embodiment includes: a controller 1, a switching circuit 3, and multiple battery modules 2 arranged in series;

[0058] The first end of the multiple battery modules 2 arranged in series is connected to a load or power source through the switching circuit 3, and the second end of the multiple battery modules 2 arranged in series is connected to a load or power source; the controller 1 is connected to the first end, the second end, and the control end of the switching circuit 3.

[0059] The controller 1 is also used to detect the first voltage at the first terminal position and the second voltage at the second terminal position of the switching circuit 3.

[0060] The controller 1 is also configured to send a stop operation signal to the conduction switching circuit 3 when the voltage difference between the first voltage and the second voltage is greater than a preset threshold.

[0061] The switching circuit 3 is used to disconnect the battery module 2 from the load or power source when the stop operation signal is received.

[0062] It should be noted that the switching circuit 3 can be a diode contactor, the controller 1 can be a BCU (main control board), and the number of battery modules 2 can be set according to actual needs; this embodiment does not impose any restrictions. In this embodiment, the power supply and load are at the same level, allowing simultaneous charging of battery modules 2. The first voltage at the first terminal position and the second voltage at the second terminal position of the switching circuit 3 are the input and output voltages of the switching circuit 3. The preset threshold can be set according to actual needs; this embodiment does not impose any restrictions.

[0063] In the specific implementation, the controller 1 monitors the voltage difference across the switching circuit 3 in real time, and sends a stop signal in time when the voltage difference exceeds the preset threshold, so that the switching circuit 3 can quickly disconnect the battery module 2 from the load or power supply, thereby effectively preventing the battery module 2 from working under abnormal voltage difference, avoiding battery damage caused by overcharging or over-discharging, extending the battery's service life, improving the safety and reliability of the system, and reducing the risk of failure and maintenance costs.

[0064] Based on the first embodiment of this application, in the second embodiment of this application, the content that is the same as or similar to the first embodiment described above can be referred to the above description, and will not be repeated hereafter. Based on this, please refer to... Figure 2 As shown, Figure 2 This is a schematic diagram of the structure of the second embodiment of the battery cabinet proposed in this application.

[0065] Considering the working principle of the switching circuit 3 during the charging and discharging of battery module 2, such as... Figure 2 As shown, the switching circuit 3 described in this embodiment further includes: a discharge contactor 31;

[0066] The discharge contactor 31 is connected to the controller 1, the battery module 2, and the load, respectively;

[0067] The controller 1 is also used to output a discharge signal to the switching circuit 3 when a load is connected to the switching circuit 3;

[0068] The discharge contactor 31 is used to connect the battery module 2 to the load when a discharge signal is received, so as to realize the discharge of the battery module 2 to the load.

[0069] It should be noted that the discharge signal can be a current signal or a voltage signal, and can also be set according to actual needs. This embodiment does not impose any restrictions.

[0070] Furthermore, the switching circuit 3 includes: a charging contactor 32;

[0071] The charging contactor 32 is connected to the controller 1, the battery module 2, and the power source, respectively.

[0072] The controller 1 is also used to output a charging signal to the switching circuit 3 when the power supply is connected to the switching circuit 3;

[0073] The charging contactor 32 is used to connect the battery module 2 to the power source when it receives a charging signal, so as to enable the power source to charge the battery module 2.

[0074] It should be noted that the charging signal can be a current signal or a voltage signal, and can also be set according to actual needs. This embodiment does not impose any restrictions.

[0075] In the specific implementation, under normal circumstances, both the charging contactor 32 and the discharging contactor 31 are closed. After the battery module 2 is fully charged, the charging contactor 32 is disconnected, the charging is cut off, and the battery waits for the discharge to begin. When switching to discharge, the discharge diode (first diode D1) and the discharge contactor 31 first detect the current and then close the charging contactor 32. After the battery module 2 is fully discharged, the discharge contactor 31 is disconnected, the discharge is cut off, and the battery waits for the charging to begin. When switching to charging, the charging diode (second diode D2) and the charging contactor 32 perform the charging. When the charging current is detected, the discharge diode is closed.

[0076] Furthermore, the battery cabinet also includes: a pre-charging circuit 4;

[0077] The pre-charging circuit 4 is connected to the power supply, the controller 1, and the battery module 2, respectively.

[0078] The controller 1 is also used to send a pre-charge signal to the pre-charge circuit 4;

[0079] The pre-charging circuit 4 is used to pre-charge the battery module 2 through the power supply when a pre-charging signal is received.

[0080] It should be noted that the pre-charging circuit 4 consists of a contactor and a resistor. When the battery is first powered on, the pre-charging circuit 4 is used to balance the voltage at both ends and pre-charge the battery module 2. After the pre-charging is completed, the contactor in the pre-charging circuit 4 is disconnected, and the charging contactor 32 and the discharging contactor 31 are closed.

[0081] In this embodiment, the pre-charging circuit 4 is designed to allow the battery module 2 to be pre-charged before formal charging, effectively reducing the inrush current during the initial charging of the battery module 2, minimizing damage to the battery, and extending its lifespan. Simultaneously, the precise control of the pre-charging process by the controller 1 improves the safety and reliability of charging, further optimizing the overall charging management strategy of the battery cabinet.

[0082] Furthermore, the battery cabinet also includes: a voltage conversion module 5;

[0083] The voltage conversion module 5 is connected to the battery module 2, the switching circuit 3 and the controller 1 respectively;

[0084] The voltage conversion module 5 is used to convert the AC voltage signal of the power supply into a DC voltage signal and send it to the battery module 2 when the battery module 2 is connected to the power supply.

[0085] It should be noted that the voltage conversion module 5 includes: a rectifier circuit and an inverter circuit (AC / DC module), a boost circuit and a buck circuit (DC / DC module), and can also be configured according to actual needs. This embodiment does not impose any restrictions.

[0086] In a specific implementation, the voltage conversion module 5 is used to convert the AC voltage signal of the power supply into a DC voltage signal and send it to the battery module 2 when the battery module 2 is connected to a power source. The voltage conversion module 5 is also used to convert the DC voltage signal of the battery module 2 into a high-voltage DC signal and send it to the load when the battery module 2 is connected to a load.

[0087] Furthermore, the battery cabinet also includes: a current detection module 6;

[0088] The current detection module 6 is connected to the battery module 2, the conduction switching circuit 3 and the controller 1 respectively;

[0089] The current detection module 6 is used to detect the current of the battery module 2 during charging and discharging, and send it to the controller 1;

[0090] The controller 1 is used to send a stop operation signal to the conduction switching circuit 3 when the current is greater than a preset current, so that the conduction switching circuit 3 stops operating.

[0091] It should be noted that the current detection module 6 can be a sampling resistor or a current sensor, or it can be set according to actual needs; this embodiment does not impose any restrictions. The preset current can be set according to actual needs; this embodiment does not impose any restrictions.

[0092] In the specific implementation, the current detection module 6 monitors the charging and discharging current of the battery module 2 in real time. When the current exceeds the preset threshold, the controller 1 sends a stop operation signal in time, so that the switching circuit 3 stops operating, thereby effectively preventing damage to the battery module 2 or safety accidents caused by overcurrent, improving the safety and reliability of the system, avoiding equipment failure or performance degradation caused by abnormal current, and ensuring that the battery module 2 operates within the safe current range.

[0093] Based on the second embodiment of this application, in the third embodiment of this application, the content that is the same as or similar to the second embodiment described above can be referred to the above description, and will not be repeated hereafter. Based on this, please refer to... Figure 3 , Figure 3 This is a circuit diagram of the second embodiment of the battery cabinet proposed in this application.

[0094] like Figure 3 As shown, the discharge contactor 31 in this embodiment includes: a first contactor KM1 and a first diode D1;

[0095] The first terminal of the first contactor KM1 is connected to the negative terminal of the first diode D1, the second terminal of the first contactor KM1 is connected to the load, and the positive terminal of the first diode D1 is connected to the battery module 2 and the controller 1 respectively.

[0096] It should be noted that the first diode D1 is a discharge diode.

[0097] Furthermore, the charging contactor 32 includes: a second contactor KM2 and a second diode D2;

[0098] The first terminal of the second contactor KM2 is connected to the battery module 2 and the controller 1 respectively, the second terminal of the second contactor KM2 is connected to the negative terminal of the second diode D2 respectively, and the positive terminal of the second diode D2 is connected to the power supply respectively.

[0099] It should be noted that the second diode D2 is a charging diode.

[0100] Furthermore, the pre-charging circuit 4 includes: a third contactor KM3 and a first resistor R;

[0101] The first end of the first resistor R is connected to the battery module 2 and the controller 1 respectively, the second end of the first resistor R is connected to the first end of the third contactor KM3, and the second end of the third contactor KM3 is connected to the power supply respectively.

[0102] It should be noted that the first resistor R is used for voltage division.

[0103] In the specific implementation, controller 1 realizes the discharge link between battery module 2 and load by controlling the opening and closing of the first contactor KM1, controller 1 realizes the charging link between battery module 2 and power source by controlling the opening and closing of the second contactor KM2, and controller 1 realizes the pre-charging of battery module 2 by controlling the opening and closing of the third contactor KM3.

[0104] In addition, such as Figure 4 As shown, in order to achieve the above objectives, this application also proposes a multi-cluster parallel system, which includes a switch, a multi-cluster parallel module and a battery cabinet as described above.

[0105] The switch is connected to the multi-cluster parallel module, the controller 1 in each battery cabinet, and the conduction switching circuit 3.

[0106] It should be noted that the battery cabinet communicates with the switch via CAN bus / Ethernet, and the switch communicates with the multi-cluster parallel modules via Ethernet. The multi-cluster parallel modules are also connected to the Energy Management System (EMS) and the Power Processing System (PCS). The multi-cluster parallel modules communicate with the EMS via Ethernet, and with the PCS via CAN bus. The communication cycle is 200ms. The switch is also connected to the Human-Machine Interface (HMI), which integrates battery cabinet-level data in real time to form a system-level parameter matrix.

[0107] It is understandable that in the charging link, the charging contactor 32 closes, and the power supply charges battery module 2; in the discharging link, the discharging contactor 31 closes, and battery module 2 discharges to the load. The multi-cluster parallel system implements a four-quadrant control strategy based on the battery cabinet link status. When the status code is S0, both the charging and discharging links are in normal state, and the system response strategy is full-function operation mode; when the status code is S1, the charging link is in disabled state, the discharging link is in normal state, and the system response strategy is dedicated discharging mode (charging isolation); when the status code is S2, both the charging and discharging links are in disabled state, and the system response strategy is dedicated charging mode (discharging isolation); when the status code is S3, both the charging and discharging links are in disabled state, and the system response strategy is safety lockout mode.

[0108] It should be noted that, as Figure 5As shown, the typical operation flow of a multi-cluster parallel system includes: power-on process, cluster control (charging cluster and discharging cluster), and power-off process. Power-on process: Battery cabinet self-test, state matrix determination, distributed pre-charging, system ready. Charging cluster: Verify S0 / S2 states, perform voltage balancing, and close charging contactor 32. Discharging cluster: Verify S0 / S1 states, perform voltage balancing, and close discharging contactor 31. Power-off process: Current reduction request, distributed link disconnection, system standby.

[0109] Understandably, the forced charging mode (emergency handling, command control) of the multi-cluster parallel system adopts a 5-dimensional state decision model. When the forced mode is F0, both the charging and discharging links are in normal state, and the system response strategy is a normal charging process. When the forced mode is F1, the charging link is in a prohibited state, while the discharging link is in a normal state, and the system response strategy is to either not charge or force contactor charging (manual maintenance). When the forced mode is F2, the charging link is in a normal state, while the discharging link is in an undervoltage prohibited state, and the system response strategy is to perform pre-charge compensation and then initiate forced charging. When the forced mode is F3, the charging link is in a normal state, while the discharging link is in a non-undervoltage prohibited state, and the system response strategy is to either not charge or force contactor charging (manual maintenance). When the forced mode is F4, both the charging and discharging links are in a prohibited state, and the system response strategy is to either not charge or force contactor charging (manual maintenance).

[0110] It should be noted that the multi-cluster parallel system, through topology optimization and control algorithm improvements, increases the availability of the multi-cluster battery cabinet system by 40%, reduces the fault impact range by 75%, and increases the end battery charging rate to over 98%.

[0111] In practical implementation, when a battery module 2 or the switching circuit 3 malfunctions, the system can isolate the faulty part in a timely manner to prevent the fault from spreading to other battery modules 2 or the entire system, thereby reducing the impact of the fault on the system operation.

[0112] The above are merely preferred embodiments of this application and do not limit the scope of this application. Any equivalent structural or procedural transformations made based on the description and drawings of this application, or direct or indirect applications in other related technical fields, are similarly included within the protection scope of this application.

Claims

1. A battery cabinet, characterized in that, The battery cabinet includes: a controller, a switching circuit, and multiple battery modules arranged in series; The first end of the multiple battery modules arranged in series is connected to a load or power source through the switching circuit, and the second end of the multiple battery modules arranged in series is connected to a load or power source; the controller is connected to the first end, the second end and the control end of the switching circuit. The controller is also used to detect a first voltage at the first terminal position and a second voltage at the second terminal position of the switching circuit. The controller is also configured to send a stop operation signal to the conduction switching circuit when the voltage difference between the first voltage and the second voltage is greater than a preset threshold. The switching circuit is used to disconnect the battery module from the load or power source in response to the stop signal.

2. The battery cabinet as described in claim 1, characterized in that, The switching circuit further includes: a discharge contactor; The discharge contactor is connected to the controller, the battery module, and the load, respectively. The controller is also used to output a discharge signal to the switching circuit when a load is connected to the switching circuit; The discharge contactor is used to connect the battery module to the load when a discharge signal is received, so as to enable the battery module to discharge to the load.

3. The battery cabinet as described in claim 2, characterized in that, The discharge contactor includes: a first contactor and a first diode; The first end of the first contactor is connected to the negative terminal of the first diode, the second end of the first contactor is connected to the load, and the positive terminal of the first diode is connected to the battery module and the controller, respectively.

4. The battery cabinet as described in claim 1, characterized in that, The switching circuit includes: a charging contactor; The charging contactor is connected to the controller, the battery module, and the power source, respectively. The controller is also used to output a charging signal to the switching circuit when the power supply is connected to the switching circuit; The charging contactor is used to connect the battery module to the power source when it receives a charging signal, so as to enable the power source to charge the battery module.

5. The battery cabinet as described in claim 4, characterized in that, The charging contactor includes: a second contactor and a second diode; The first end of the second contactor is connected to the battery module and the controller respectively, the second end of the second contactor is connected to the negative terminal of the second diode respectively, and the positive terminal of the second diode is connected to the power supply respectively.

6. The battery cabinet as described in claim 1, characterized in that, The battery cabinet also includes: a pre-charging circuit; The pre-charging circuit is connected to the power supply, the controller, and the battery module, respectively. The controller is also configured to send a pre-charge signal to the pre-charge circuit; The pre-charging circuit is used to pre-charge the battery module through the power supply when a pre-charging signal is received.

7. The battery cabinet as described in claim 6, characterized in that, The pre-charging circuit includes: a third contactor and a first resistor; The first end of the first resistor is connected to the battery module and the controller respectively, the second end of the first resistor is connected to the first end of the third contactor, and the second end of the third contactor is connected to the power supply respectively.

8. The battery cabinet as described in claim 1, characterized in that, The battery cabinet also includes: a voltage conversion module; The voltage conversion module is connected to the battery module, the switching circuit and the controller respectively; The voltage conversion module is used to convert the AC voltage signal of the power supply into a DC voltage signal and send it to the battery module when the battery module is connected to the power supply.

9. The battery cabinet as described in claim 1, characterized in that, The battery cabinet also includes: a current detection module; The current detection module is connected to the battery module, the switching circuit and the controller respectively; The current detection module is used to detect the current during the charging and discharging of the battery module and send it to the controller; The controller is configured to send a stop signal to the switching circuit when the current is greater than a preset current, so as to stop the switching circuit from operating.

10. A multi-cluster parallel system, characterized in that, The multi-cluster parallel system includes a switch, a multi-cluster parallel module, and a battery cabinet as described in any one of claims 1 to 9; The switch is connected to the multi-cluster parallel module, the controller in each battery cabinet, and the conduction switching circuit.

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