Flow battery voltage withstanding test system

Abstract

The utility model belongs to the technical field of flow batteries, and particularly relates to a pressure resistance test system for a flow battery. The test system comprises an electric pile (12), a negative electrode liquid storage tank (07) and a positive electrode liquid storage tank (08), a first pipeline (05), a second pipeline (06) and a leakage detection sensor; and the leakage detection sensor is configured to detect the electrolyte leakage condition of the electric pile (12). Compared with a conventional galvanic pile sealing performance test, the galvanic pile sealing performance test device tests the sealing performance of the galvanic pile under a test condition which is worse than an actual use condition, and the sealing performance of the galvanic pile is tested more visually. The test system integrates two tests, can realize alternate dynamic voltage withstanding and static voltage withstanding tests, avoids repeated replacement of the test system for two tests of the battery, saves the test time, and improves the work efficiency.

Description

Technical Field

[0001] The utility model belongs to the technical field of liquid flow batteries, and in particular relates to a liquid flow battery withstand voltage test system. Background Art

[0002] With the rapid development of the liquid flow battery industry and its increasing market applications, the sealing of liquid flow batteries is particularly important to the development and impact of the entire industry. If the battery leaks, it will not only cause damage to the body, but also corrode the surrounding components, and have a great impact on the environment and people. Therefore, the sealing of the battery needs to undergo strict and harsh liquid pressure resistance tests.

[0003] At present, liquid flow batteries mainly use gas to detect stack leakage. Because the pressure shock that the battery is subjected to during use is fundamentally different from that of the medium, the measurement accuracy is not high, so the gas sealing detection cannot be accurately quantified.

[0004] In order to solve the above problems, this application is proposed. Utility Model Content

[0005] The present application provides a test system that can perform static withstand voltage and dynamic withstand voltage tests of a flow battery alternately; it can simulate actual working conditions on site, and even the test conditions are far higher than the actual working conditions. The static and dynamic pressures can be tested between 0 and 0.5 mPa; the test system has a high degree of integration and can quickly and effectively test the battery's withstand voltage capability.

[0006] In a first aspect, the present application provides a flow battery withstand voltage test system, the test system comprising: a battery stack 12, a negative electrode storage tank 07, and a positive electrode storage tank 08;

[0007] The outlet of the negative electrode liquid storage tank 07 is connected to the negative electrode electrolyte inlet of the battery stack 12 through the negative electrode liquid inlet pipeline 01, and the negative electrode electrolyte outlet of the battery stack 12 is connected to the inlet of the negative electrode liquid storage tank 07 through the negative electrode liquid outlet pipeline 02. The negative electrode liquid inlet pipeline 01 is provided with a negative electrode circulation pump 09 located upstream and a negative electrode battery stack liquid inlet valve 1 located downstream, and the negative electrode liquid outlet pipeline 02 is provided with a negative electrode battery stack liquid return valve 3;

[0008] The outlet of the positive electrode liquid storage tank 08 is connected to the positive electrode electrolyte inlet of the battery stack 12 through the positive electrode liquid inlet pipeline 03, and the positive electrode electrolyte outlet of the battery stack 12 is connected to the inlet of the positive electrode liquid storage tank 08 through the positive electrode liquid outlet pipeline 04. The positive electrode liquid inlet pipeline 03 is provided with a positive electrode circulation pump 10 located upstream and a positive electrode battery stack liquid inlet valve 2 located downstream, and the positive electrode liquid outlet pipeline 04 is provided with a positive electrode battery stack liquid return valve 4;

[0009] The test system further comprises: a first pipeline 05, a second pipeline 06 and a leakage detection sensor;

[0010] The upstream end of the first pipeline 05 is connected to the positive electrode liquid inlet pipeline 03 and the connection point is located upstream of the positive electrode circulation pump 10, or the upstream end of the first pipeline 05 is connected to the negative electrode liquid inlet pipeline 01 and the connection point is located upstream of the negative electrode circulation pump 09, and the downstream end of the first pipeline 05 is connected to the middle of the second pipeline 06. The first pipeline 05 is provided with a first pump 11;

[0011] One end of the second pipeline 06 is connected to the negative electrode liquid inlet pipeline 01 and the connection point is located downstream of the negative electrode stack liquid inlet valve 1, and the other end of the second pipeline 06 is connected to the positive electrode liquid inlet pipeline 03 and the connection point is located downstream of the positive electrode stack liquid inlet valve 2;

[0012] The leakage detection sensor is configured to detect electrolyte leakage of the fuel cell stack 12 .

[0013] Preferably, the negative electrode liquid outlet pipeline 02 and the positive electrode liquid outlet pipeline 04 are both provided with a temperature sensor and a pressure sensor.

[0014] Preferably, a first temperature sensor and a first pressure sensor are provided on the negative electrode liquid inlet pipeline 01 , and both the first temperature sensor and the first pressure sensor are located downstream of the connection point between the second pipeline 06 and the negative electrode liquid inlet pipeline 01 .

[0015] Preferably, a second temperature sensor and a second pressure sensor are provided on the positive electrode liquid inlet pipeline 03 , and the second temperature sensor and the second pressure sensor are both located downstream of the connection point between the second pipeline 06 and the positive electrode liquid inlet pipeline 03 .

[0016] Preferably, the first pump 11 is a diaphragm pump, the positive electrode circulation pump 10 is a magnetic circulation pump, and the negative electrode circulation pump 09 is a magnetic circulation pump.

[0017] Preferably, a first valve 5 is provided on the first pipeline 05 .

[0018] A second aspect of the present application provides a flow battery withstand voltage test method, the test method comprising: one or both of a static withstand voltage test method and a dynamic withstand voltage test method;

[0019] The static withstand voltage test method comprises the following steps:

[0020] Close the negative electrode circulation pump 09 and the positive electrode circulation pump 10, close the negative electrode stack liquid return valve 3 and the positive electrode stack liquid return valve 4, open the negative electrode stack liquid inlet valve 1 and the positive electrode stack liquid inlet valve 2 to make the battery stack 12 a closed space, turn on the first pump 11, and continuously increase the pressure at a fixed time. During this process, the electrolyte in the positive electrode storage tank 08 or the negative electrode storage tank 07 flows through the first pump 11, the first pipeline 05, and the second pipeline 06 in sequence and flows to the battery stack 12, and increases the pressure in the battery stack 12. At the same time, the leakage detection sensor is used to test the leakage sealing of the battery stack 12;

[0021] The dynamic withstand voltage test method comprises the following steps:

[0022] Open the negative electrode stack liquid inlet valve 1, the positive electrode stack liquid inlet valve 2, the negative electrode stack liquid return valve 3, and the positive electrode stack liquid return valve 4, close the first pump 11, and start the negative electrode circulation pump 09 and the positive electrode circulation pump 10, so that the electrolyte in the negative electrode storage tank 07 and the positive electrode storage tank 08 flows and circulates in the battery stack 12, and use the leakage detection sensor to test the leakage sealing of the battery stack 12.

[0023] In this application, the electrolyte flow direction in the pipeline is recorded as from upstream to downstream.

[0024] Compared with the prior art, this application has the following beneficial effects:

[0025] 1. Compared with conventional fuel cell stack sealing tests, this application tests the sealing of the fuel cell stack under test conditions that are more severe than actual use conditions, and tests the sealing of the fuel cell stack more intuitively.

[0026] 2. A test system of the present application integrates two tests, which can realize alternating dynamic withstand voltage test and static withstand voltage test, avoiding the need to change the test system back and forth for the battery to undergo the two tests, saving test time and improving work efficiency.

[0027] 3. The alternating test items of dynamic withstand voltage and static withstand voltage share most of the hardware and software systems, which greatly saves costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic structural diagram of the first embodiment of the liquid flow battery pressure test system of the present application.

[0029] List of reference numerals:

[0030] 01. Negative electrode liquid inlet pipeline, 02. Negative electrode liquid outlet pipeline, 03. Positive electrode liquid inlet pipeline, 04. Positive electrode liquid outlet pipeline, 05. First pipeline, 06. Second pipeline, 07. Negative electrode storage tank, 08. Positive electrode storage tank, 09. Negative electrode circulation pump, 10. Positive electrode circulation pump, 11. First pump, 1. Negative electrode stack liquid inlet valve, 2. Positive electrode stack liquid inlet valve, 3. Negative electrode stack liquid return valve, 4. Positive electrode stack liquid return valve, 5. First valve, T, temperature sensor, P, pressure sensor, L, leakage detection sensor. DETAILED DESCRIPTION

[0031] The present application is further described in detail below in conjunction with embodiments.

[0032] Those skilled in the art will appreciate that the following examples are only used to illustrate the present application and should not be considered to limit the scope of the present application. If no specific techniques or conditions are specified in the examples, the techniques or conditions described in the literature in the art or the product specifications are used. If the manufacturer of the materials or equipment used is not specified, they are all conventional products that can be purchased.

[0033] Those skilled in the art will appreciate that, unless expressly stated otherwise, the singular forms "a", "an", "said" and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification of the present application refers to the presence of the features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof. It should be understood that when we refer to an element as being "connected" to another element, it may be directly connected to the other element, or there may be intermediate elements. In addition, the "connection" used herein may include wireless connections.

[0034] In the description of this application, unless otherwise specified, "plurality" means two or more. The terms "inside", "upper", "lower", etc. indicate positions or state relationships based on the positions or state relationships shown in the drawings, which are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operate in a specific position, and therefore cannot be understood as limiting this application.

[0035] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "provided with" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application are understood according to specific circumstances.

[0036] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein, including technical and scientific terms, have the same meaning as those generally understood by those skilled in the art to which this application belongs. It should also be understood that terms such as those defined in common dictionaries should be understood to have meanings consistent with the meanings in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless defined as herein.

[0037] The "range" disclosed in the present application is defined in the form of a lower limit and an upper limit, and a given range is defined by selecting a lower limit and an upper limit, and the selected lower limit and upper limit define the boundaries of the particular range. The range defined in this way can be inclusive or exclusive of the end values, and can be arbitrarily combined, that is, any lower limit can be combined with any upper limit to form a range. For example, if a range of 60 to 120 and 80 to 110 is listed for a particular parameter, it is understood that a range of 60 to 110 and 80 to 120 is also expected. In addition, if the minimum range values ​​1 and 2 are listed, and if the maximum range values ​​3, 4 and 5 are listed, the following ranges can all be expected: 1 to 3, 1 to 4, 1 to 5, 2 to 3, 2 to 4 and 2 to 5. In the present application, unless otherwise specified, the numerical range "a to b" represents an abbreviation of any real number combination between a and b, where a and b are both real numbers. For example, the numerical range "0-5" means that all real numbers between "0-5" are listed in this document, and "0-5" is just an abbreviation of these numerical combinations. In addition, when a parameter is expressed as an integer ≥ 2, it is equivalent to disclosing that the parameter is, for example, an integer of 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0038] If not otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution. If not otherwise specified, all technical features and optional technical features of the present application can be combined with each other to form a new technical solution. If not otherwise specified, all steps of the present application can be performed sequentially or randomly, preferably sequentially. For example, the method includes steps (a) and (b), indicating that the method may include steps (a) and (b) performed sequentially, or may include steps (b) and (a) performed sequentially. For example, the method may further include step (c), indicating that step (c) may be added to the method in any order, for example, the method may include steps (a), (b) and (c), or may include steps (a), (c) and (b), or may include steps (c), (a) and (b), etc.

[0039] If there is no special explanation, the "include" and "comprising" mentioned in this application represent open-ended or closed-ended expressions. For example, the "include" and "comprising" may represent that other components not listed may also be included or only the listed components may be included or only the listed components may be included.

[0040] If not specifically stated, in this application, the term "or" is inclusive. For example, the phrase "A or B" means "A, B, or both A and B".

[0041] A flow battery withstand voltage test system, the test system comprising: a battery stack 12, a negative electrode storage tank 07, and a positive electrode storage tank 08;

[0042] The outlet of the negative electrode liquid storage tank 07 is connected to the negative electrode electrolyte inlet of the battery stack 12 through the negative electrode liquid inlet pipeline 01, and the negative electrode electrolyte outlet of the battery stack 12 is connected to the inlet of the negative electrode liquid storage tank 07 through the negative electrode liquid outlet pipeline 02. The negative electrode liquid inlet pipeline 01 is provided with a negative electrode circulation pump 09 located upstream and a negative electrode battery stack liquid inlet valve 1 located downstream, and the negative electrode liquid outlet pipeline 02 is provided with a negative electrode battery stack liquid return valve 3;

[0043] The outlet of the positive electrode liquid storage tank 08 is connected to the positive electrode electrolyte inlet of the battery stack 12 through the positive electrode liquid inlet pipeline 03, and the positive electrode electrolyte outlet of the battery stack 12 is connected to the inlet of the positive electrode liquid storage tank 08 through the positive electrode liquid outlet pipeline 04. The positive electrode liquid inlet pipeline 03 is provided with a positive electrode circulation pump 10 located upstream and a positive electrode battery stack liquid inlet valve 2 located downstream, and the positive electrode liquid outlet pipeline 04 is provided with a positive electrode battery stack liquid return valve 4;

[0044] The test system further comprises: a first pipeline 05, a second pipeline 06 and a leakage detection sensor;

[0045] The upstream end of the first pipeline 05 is connected to the positive electrode liquid inlet pipeline 03 and the connection point is located upstream of the positive electrode circulation pump 10, or the upstream end of the first pipeline 05 is connected to the negative electrode liquid inlet pipeline 01 and the connection point is located upstream of the negative electrode circulation pump 09, and the downstream end of the first pipeline 05 is connected to the middle of the second pipeline 06. The first pipeline 05 is provided with a first pump 11 and a first valve 5;

[0046] One end of the second pipeline 06 is connected to the negative electrode liquid inlet pipeline 01 and the connection point is located downstream of the negative electrode stack liquid inlet valve 1, and the other end of the second pipeline 06 is connected to the positive electrode liquid inlet pipeline 03 and the connection point is located downstream of the positive electrode stack liquid inlet valve 2;

[0047] The leakage detection sensor is configured to detect electrolyte leakage of the fuel cell stack 12 .

[0048] The negative electrode liquid outlet pipeline 02 and the positive electrode liquid outlet pipeline 04 are both provided with a temperature sensor and a pressure sensor.

[0049] The negative electrode liquid inlet pipeline 01 is provided with a temperature sensor and a pressure sensor, and both the temperature sensor and the pressure sensor are located downstream of the connection point between the second pipeline 06 and the negative electrode liquid inlet pipeline 01 .

[0050] The positive electrode liquid inlet pipeline 03 is provided with a temperature sensor and a pressure sensor, and both the temperature sensor and the pressure sensor are located downstream of the connection point between the second pipeline 06 and the positive electrode liquid inlet pipeline 03 .

[0051] The first pump 11 is a diaphragm pump, the positive electrode circulation pump 10 is a magnetic circulation pump, and the negative electrode circulation pump 09 is a magnetic circulation pump.

[0052] The first implementation of the flow battery withstand voltage test system of the present application is as follows Figure 1 As shown, the system is also equipped with pressure, temperature, flow, liquid level sensors and data acquisition system.

[0053] Install the battery stack to be tested on the battery stack support platform and fix it, then install the corresponding battery stack pipeline interface of the system, and make sure that the battery stack and the test system pipeline form a closed loop. Turn on the data acquisition system, make sure that all sensors are in normal working condition, the magnetic circulation pump and diaphragm pump are in standby state, and there is no leakage or seepage in the pipeline valves and connections. Then start the test.

[0054] Of course, other pumps can be used instead of magnetic circulation pumps / diaphragm pumps, as long as they meet the pressure requirements and are corrosion-resistant and acid-resistant and can be replaced.

[0055] The test is done as follows:

[0056] The static withstand voltage test method includes the following steps:

[0057] Close the negative electrode circulation pump 09 and the positive electrode circulation pump 10, close the negative electrode stack return valve 3 and the positive electrode stack return valve 4, open the negative electrode stack inlet valve 1 and the positive electrode stack inlet valve 2 to make the stack 12 a closed space, turn on the first pump 11, and continuously increase the pressure at a fixed time. During this process, the electrolyte in the positive electrode storage tank 08 or the negative electrode storage tank 07 flows through the first pump 11, the first pipeline 05, and the second pipeline 06 in sequence and flows to the stack 12, and the pressure is increased in the stack 12. At the same time, the leakage detection sensor is used to test the leakage sealing of the stack 12. The test results are shown in Table 1. In this process, the electrolyte flows to: storage tank 08 / storage tank 07-diaphragm pump 11-pipeline 05---pipeline 06---stack 12.

[0058] The dynamic withstand voltage test method includes the following steps:

[0059] Open the negative electrode stack liquid inlet valve 1, the positive electrode stack liquid inlet valve 2, the negative electrode stack liquid return valve 3, and the positive electrode stack liquid return valve 4, close the first pump 11, and start the negative electrode circulation pump 09 and the positive electrode circulation pump 10, so that the electrolyte in the negative electrode storage tank 07 and the positive electrode storage tank 08 flows and circulates in the battery stack 12, and use the leakage detection sensor to test the leakage sealing of the battery stack 12.

[0060] Electrolyte flow direction:

[0061] Positive electrode: positive electrode liquid storage tank 08---positive electrode circulation pump 10---positive electrode liquid inlet pipeline 03---electrical stack 12---positive electrode liquid outlet pipeline 04---positive electrode liquid storage tank 08

[0062] Negative electrode: Negative electrode liquid storage tank 07---negative electrode circulation pump 09---negative electrode liquid inlet pipeline 01---cell stack 12--negative electrode liquid outlet pipeline 02---negative electrode liquid storage tank 07

[0063] Static withstand voltage test and dynamic withstand voltage test can be carried out alternately.

[0064] When the dynamic and static pressure withstand tests of the battery stack are performed alternately, it is only necessary to switch the corresponding pipelines and turn on or off the corresponding magnetic circulation pump / diaphragm pump to quickly switch between the two pressure withstand tests. The acquisition system can detect the changes in the pressure values ​​at the inlet and outlet of the battery stack 12 in real time.

[0065] When electrolyte leakage occurs in the battery stack during the alternating test, the leakage detection sensor will send a command to the acquisition system and quickly shut down and issue an alarm. This avoids unnecessary losses and safety risks after the test is still carried out even if the leakage is large.

[0066] Table 1 Static withstand voltage test of battery stack

[0067]

[0068] Table 2 Dynamic withstand voltage test of battery stack

[0069]

Claims

1. A flow battery withstand voltage test system, characterized in that: The test system comprises: a battery stack (12), a negative electrode liquid storage tank (07), and a positive electrode liquid storage tank (08); The outlet of the negative electrode liquid storage tank (07) is connected to the negative electrode electrolyte inlet of the battery stack (12) through a negative electrode liquid inlet pipeline (01), and the negative electrode electrolyte outlet of the battery stack (12) is connected to the inlet of the negative electrode liquid storage tank (07) through a negative electrode liquid outlet pipeline (02), the negative electrode liquid inlet pipeline (01) is provided with a negative electrode circulation pump (09) located upstream and a negative electrode battery stack liquid inlet valve (1) located downstream, and the negative electrode liquid outlet pipeline (02) is provided with a negative electrode battery stack liquid return valve (3); The outlet of the positive electrode liquid storage tank (08) is connected to the positive electrode electrolyte inlet of the battery stack (12) through the positive electrode liquid inlet pipeline (03), and the positive electrode electrolyte outlet of the battery stack (12) is connected to the inlet of the positive electrode liquid storage tank (08) through the positive electrode liquid outlet pipeline (04). The positive electrode liquid inlet pipeline (03) is provided with a positive electrode circulation pump (10) located upstream and a positive electrode battery stack liquid inlet valve (2) located downstream, and the positive electrode liquid outlet pipeline (04) is provided with a positive electrode battery stack liquid return valve (4); The test system further comprises: a first pipeline (05), a second pipeline (06) and a leakage detection sensor; The upstream end of the first pipeline (05) is connected to the positive electrode liquid inlet pipeline (03) and the connection point is located upstream of the positive electrode circulation pump (10); or the upstream end of the first pipeline (05) is connected to the negative electrode liquid inlet pipeline (01) and the connection point is located upstream of the negative electrode circulation pump (09); the downstream end of the first pipeline (05) is connected to the middle of the second pipeline (06); and the first pipeline (05) is provided with a first pump (11) and a first valve (5); One end of the second pipeline (06) is connected to the negative electrode liquid inlet pipeline (01) and the connection point is located downstream of the negative electrode stack liquid inlet valve (1), and the other end of the second pipeline (06) is connected to the positive electrode liquid inlet pipeline (03) and the connection point is located downstream of the positive electrode stack liquid inlet valve (2); The leakage detection sensor is configured to detect electrolyte leakage of the battery stack (12).

2. The flow battery withstand voltage test system according to claim 1, characterized in that: The negative electrode liquid outlet pipeline (02) and the positive electrode liquid outlet pipeline (04) are both provided with a temperature sensor and a pressure sensor.

3. The flow battery withstand voltage test system according to claim 1, characterized in that: The negative electrode liquid inlet pipeline (01) is provided with a first temperature sensor and a first pressure sensor, and the first temperature sensor and the first pressure sensor are both located downstream of the connection point between the second pipeline (06) and the negative electrode liquid inlet pipeline (01).

4. The flow battery withstand voltage test system according to claim 1, characterized in that: A second temperature sensor and a second pressure sensor are provided on the positive electrode liquid inlet pipeline (03), and the second temperature sensor and the second pressure sensor are both located downstream of the connection point between the second pipeline (06) and the positive electrode liquid inlet pipeline (03).

5. The flow battery withstand voltage test system according to claim 1, characterized in that: The first pump (11) is a diaphragm pump, the positive electrode circulation pump (10) is a magnetic circulation pump, and the negative electrode circulation pump (09) is a magnetic circulation pump.

6. The flow battery withstand voltage test system according to claim 1, characterized in that: The first pipeline (05) is provided with a first valve (5).

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