Flow battery test module

Abstract

The utility model belongs to the technical field of liquid flow battery discloses a kind of liquid flow battery test module, preset main test port P1, main test port P1 is electrically connected to the output terminal of battery positive and negative pole, a plurality of electric pile single section voltage monitoring port P2 is preset in battery shell, each electric pile single section voltage monitoring port P2 is electrically connected to the single section battery positive and negative pole terminal of corresponding electric pile inside, for obtaining the single section battery voltage state inside single electric pile.The utility model greatly improves the efficiency of troubleshooting electric pile.

Description

Technical Field

[0001] This utility model belongs to the field of flow battery technology and relates to a flow battery testing module. Background Technology

[0002] The core principle of flow batteries is to store electrical energy through the reversible redox reaction of active materials in the positive and negative electrode electrolytes. The decoupled design of its power unit (stacking unit) and energy unit (electrolyte tank) allows its capacity to be linearly expanded by increasing the electrolyte volume, making it particularly suitable for large-scale, long-term energy storage scenarios. However, key bottlenecks remain between technological maturity and large-scale application. Among these, the standardization and modularization of testing technologies directly affect the industry's progress in cost reduction and efficiency improvement.

[0003] Currently, the common testing method for vanadium redox flow batteries is the single-current-port overall cycling method. This involves connecting the battery module as a whole to the charge / discharge testing equipment and applying power to the entire module for charge / discharge cycle testing only using the main positive and negative input / output terminals (main current port). This method only obtains highly aggregated single performance indicators such as the overall charge / discharge capacity and total energy efficiency of the battery module—that is, the performance data of the entire module. When the overall performance is poor, it is necessary to use independent voltage acquisition equipment to test the open-circuit voltage of each cell in the battery module, and then perform statistical analysis of the data to identify the stacks with large performance differences and individual faulty cells. This requires manual troubleshooting, data collection, and further analysis.

[0004] The key technical limitation of the single-current-port overall cycle testing method lies in its ability to obtain only the overall aggregate performance of the module (such as total capacity and total efficiency). It lacks effective means to quickly acquire specific state information of each component stack within the module, such as differences in open-circuit potential and self-discharge rates. It cannot synchronously and rapidly acquire key state parameters of each stack unit within the module, making it impossible to effectively assess stack consistency or locate individual cells with localized faults. It requires manual acquisition of core performance parameters using external equipment, which is time-consuming, inefficient, and results in delayed data analysis. In large-scale energy storage power stations, the analytical results obtained from this testing method are severely lagging, impacting critical decision-making at the power station. Utility Model Content

[0005] The core technical problem that this utility model urgently needs to solve is: how to provide a method for testing a vanadium redox flow battery module, so that it can quickly, efficiently and safely obtain the overall performance of the module and the status information of its key internal components. This invention provides a high-efficiency testing module for vanadium redox flow batteries. The core of this module lies in utilizing pre-defined interfaces and optimized testing strategies to quickly obtain overall performance and internal stack status. The specific solution is as follows: A flow battery testing module includes a pre-set main test port electrically connected to the output terminals of the positive and negative terminals of the battery. Several stack single-cell voltage monitoring ports are pre-set on the battery casing. Each stack single-cell voltage monitoring port is internally electrically connected to the positive and negative terminals of the corresponding single cell of the stack, for obtaining the voltage state of the single cell inside the single stack.

[0006] Furthermore, the number of voltage monitoring ports per cell in the fuel cell stack is consistent with the number of cells in the battery stack.

[0007] Furthermore, both the main test port and the stack single-cell voltage monitoring port are connected to the main control device, which is used to perform fault diagnosis.

[0008] Furthermore, both the main test port and the stack single-cell voltage monitoring port are connected to a charge-discharge tester.

[0009] The advantages of this utility model compared with the prior art are: This invention greatly improves the efficiency of troubleshooting faulty fuel cells.

[0010] The original testing method required 20 minutes of data acquisition for a single fuel cell stack. Taking a 750kW module as an example, which has 18 fuel cell stacks, if there were doubts about the status of two fuel cell stacks in the 750kW module, it would take 40 minutes to complete the data acquisition and then perform analysis. The present invention provides a testing method that, compared with existing individual testing methods, can complete the status assessment of all energy storage stacks in an energy storage power station in about 20 minutes. Attached Figure Description

[0011] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0012] Figure 1 This is a schematic diagram of the existing technology test module structure before the improvement; Figure 2 This is a schematic diagram of the improved test module structure of this utility model.

[0013] In the diagram: P1. Main test port, P2. Single-cell voltage test port of fuel cell stack, 3. Main controller, 4. Charge and discharge tester. Detailed Implementation

[0014] The present invention will now be described in detail through specific embodiments, but this does not limit the scope of protection of the present invention.

[0015] Example 1 1. Key improvements in module design 1) Retain the original main test port P1: Preset and connect it to the main output terminal (main positive and negative terminals) of the battery module for overall voltage / current measurement.

[0016] 2) Added single-cell voltage monitoring port P2: 16 voltage acquisition ports are pre-installed on the battery module casing. Each port is directly and reliably connected to the positive and negative terminals of the corresponding single cell in the battery stack through internal wiring to obtain the voltage status of the single cell inside the single battery stack. 2. Optimize testing strategies 1) Retain the original testing plan, which involves applying power to the entire battery module and performing charge-discharge cycle tests. Obtain the overall charge-discharge capacity and total energy efficiency performance indicators of the battery module.

[0017] 2) The newly added main control device 3 performs fault diagnosis: a. Rapid detection of self-discharge After the battery completes charging and discharging and receives the shutdown command, the main circuit between the battery module and the charge / discharge tester 3 is disconnected. The battery module is simultaneously connected through the main test port P1 and the single cell voltage monitoring port P2. The total voltage of the module and the voltage of all single cells in the stack are recorded. After 20 minutes, the consistency of the stack voltage drop is analyzed, and stacks with voltage drops exceeding the average value by 20% are reported as abnormal stacks.

[0018] b. Single-cell open-circuit voltage difference detection After the battery completes charging and discharging and receives the shutdown command, the main circuit between the battery module and the charge / discharge tester 3 is disconnected. The battery module is simultaneously connected through the main test port P1 and the single cell voltage monitoring port P2. The total voltage of the module and the voltage of each single cell of the stack are recorded. After 20 minutes, the voltage difference of each single cell of the stack is analyzed. Stacks with a voltage difference > 100mV are identified as abnormal stacks, and the abnormal cell is indicated as the cell number of that stack.

[0019] Example 2 A 6.5MW flow battery energy storage power station has been in operation for 2 years and is charged and discharged more than once a day. The performance of several modules in the power station has deteriorated. Two of the battery modules were selected.

[0020] Battery Module #1: 500kW system, 16 battery stacks, each stack containing n batteries. Features a main test port P1 and a single-cell voltage monitoring port P2, and includes an automatic fault diagnosis strategy.

[0021] Battery module #2: 500kW system, 16 stacks, each stack contains n batteries. Only main test port P1 is available.

[0022] Test conditions: Shutdown at SOC 50%, electrolyte temperature is the same.

[0023] Battery module #1 is assessed through the main test port P1 and the single-cell voltage monitoring port P2. An abnormal battery stack is reported after 20 minutes.

[0024] For battery module #2, data from 16 battery stacks was collected using existing external equipment, and it took 5 hours to analyze and identify the abnormal battery stack.

[0025] Example 1 and Example 2 are illustrated using 20 minutes as an example. In actual applications, tests can be conducted at different intervals as needed.

[0026] The embodiments described above are merely preferred embodiments of this utility model, and not all feasible embodiments of this utility model. For those skilled in the art, any obvious modifications made without departing from the principles and spirit of this utility model should be considered to be included within the scope of protection of the claims of this utility model.

Claims

1. A flow battery testing module, characterized in that, A main test port (P1) is pre-set, which is electrically connected to the output terminals of the positive and negative terminals of the battery. Several single-cell voltage monitoring ports (P2) are pre-set on the battery casing. Each single-cell voltage monitoring port (P2) is electrically connected to the positive and negative terminals of the single cell of the corresponding battery stack to obtain the voltage status of the single cell inside the single battery stack.

2. The flow battery testing module according to claim 1, characterized in that, The number of voltage monitoring ports (P2) per cell of the battery stack is consistent with the number of cells in the battery stack.

3. The flow battery testing module according to claim 1, characterized in that, The main test port (P1) and the stack single-section voltage monitoring port (P2) are both connected to the main control device (3), which is used to perform fault judgment.

4. The flow battery testing module according to claim 1, characterized in that, The main test port (P1) and the single-cell voltage monitoring port (P2) of the fuel cell stack are both connected to the charge-discharge tester (4).

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