Battery airtightness test equipment and test method

Abstract

The invention provides battery airtightness test equipment and a test method, the battery airtightness test equipment comprises a standard component, a test piece, a standard tank and a tester, the standard component is communicated with the standard tank through a first valve pipe, the first valve pipe is communicated with a first pressure sensor, and the standard component is communicated with the test piece through a second valve pipe; the standard component and the test piece are connected with the tester; according to the invention, when the test piece is tested, the standard component can be subjected to self-inspection preferentially, errors of data generated by the standard component can be avoided, when the test piece is tested, standard data generated by the standard component and the test piece in the same time period and the same environment can be compared and tested, the influence of environmental factors can be avoided, and the test accuracy can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of battery air tightness testing, and in particular to a battery air tightness testing device and a testing method. Background Art

[0002] New energy vehicles are developing rapidly at this stage. One of the three core components of new energy vehicles is the battery device. The battery includes an integral shell and battery cells. Among them, multiple groups of battery cells are installed in the integral shell and combined into a battery pack suitable for vehicle installation. Usually, the battery pack is installed at the bottom of the car. When the car is driving, the battery pack is close to the road surface. In rainy weather, the battery pack may come into contact with rain or even be briefly immersed in water. Rainwater will seriously affect the safe operation of the battery cells inside the battery pack. Therefore, the battery pack needs to ensure good airtightness to cope with rainy weather.

[0003] When testing the air tightness of the battery pack, the change in air pressure is recorded after the test piece is inflated, and the change in air tightness of the test piece is recorded, and the change in air tightness is compared with the standard value. The judgment of this method may be affected by the ambient temperature and air pressure, resulting in the environmental factors of the test piece not corresponding to the standard value when testing, resulting in errors in the judgment of the air tightness of the battery pack, affecting the accuracy of the battery pack air tightness detection. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a battery air tightness testing device and a testing method to solve the problem that the air tightness detection of a battery pack may be affected by environmental factors and the test accuracy.

[0005] Based on the technical problems existing in the background technology, the present invention proposes a battery air tightness testing device, including a standard part, a test part, a standard tank and a tester. The standard part and the standard tank are connected through a first valve tube, and a pressure sensor is connected to the first valve tube. The standard part and the test part are connected through a second valve tube, and both the standard part and the test part are connected to the tester.

[0006] In the above scheme, the test piece, the standard tank and the tester form a whole, which is an integrated instrument. The standard tank is used to perform self-inspection on the standard part, and it can be determined whether the standard part meets the test standard when the standard part is in the pressurized state. When it meets the test standard, the standard part and the test piece are pressurized at the same time to see whether the air tightness of the test piece is within the allowable range, and whether it meets the standard.

[0007] A method for testing a battery air tightness test device, the method comprising the following steps:

[0008] S1: self-check the standard parts through the standard tank;

[0009] S2: Pressurize the test piece and conduct a preliminary test to see if it is qualified;

[0010] S3: Pressurize the standard parts and compare the data with the test parts that have passed the preliminary test to determine whether the value difference is within the range of variation and whether it is good.

[0011] Preferably, the method S1 comprises the following steps:

[0012] S11: Inflate the standard component, connect the first valve pipe to connect the standard component with the standard tank, and determine whether the standard component is normal by observing the pressure sensor.

[0013] Preferably, the method S2 comprises the following steps:

[0014] S21: The test piece and the standard piece are pressurized at the same time, and the air leakage of the test piece is first detected to see if it meets the standard. If it does not meet the standard, it is directly judged as a fault and the alarm system is triggered at the same time. No comparison test is performed with the standard piece. If it is qualified, it is further compared with the standard piece.

[0015] Preferably, the method S3 comprises the following steps:

[0016] S31: The test piece and the standard piece need to be isolated during the test process. Two pressure sensors are used to perform pressure tests on the test piece and the standard piece respectively and record the linear data generated per unit time.

[0017] S32: Subtract the test data of the two pressure sensors to obtain a pressure difference;

[0018] S33: Compare the pressure difference with the specified range. If the pressure difference between the units is within the range, it means it is qualified. If the pressure difference is not within the range, it means it is unqualified.

[0019] Compared with the prior art, the battery air tightness test device and test method proposed in the present invention adopt the above technical solution to achieve the following technical effects:

[0020] When testing the test piece, the present invention can give priority to self-checking the standard part, which can avoid errors in the data generated by the standard part. When testing the test piece, the present invention can produce standard data in the same time period and environment as the test piece for comparison testing, which can avoid the influence of environmental factors and improve the accuracy of the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the connection principle of components of the present invention;

[0022] Figure 2 The figure is a flow chart of the testing method of the present invention.

[0023] In the figure: 1. standard part; 2. test part; 3. standard tank; 4. tester; 5. first valve tube; 6. first pressure sensor. DETAILED DESCRIPTION

[0024] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0026] Example

[0027] Please refer to Figure 1 , Figure 2 The present invention proposes a battery air tightness testing device, including a standard part 1, a test part 2, a standard tank 3 and a tester 4. The standard part 1 is connected to the standard tank 3 through a first valve tube 5, and a first pressure sensor 6 is connected to the first valve tube 5. The standard part 1 is connected to the test part 2 through a second valve tube. Both the standard part 1 and the test part 2 are connected to the tester 4. In the present application, the standard part 1 is connected to the standard tank 3 through the first valve tube 5, and the first pressure sensor 6 on the first valve tube 5 has a pointer, and the pointer can facilitate personnel to observe the test situation between the standard tank 3 and the standard part 1. Before the test, the standard part 1 and the test part 2 will be pressurized at the same time to test whether the test part 2 has obvious leakage and whether the air tightness data of the standard part 1 is accurate. After the inspection of the test part 2 and the standard part 1 is completed, a comparison test will be performed.

[0028] Please refer to Figure 1 , Figure 2 , a method for testing a battery airtightness testing device, the method comprising the following steps:

[0029] S1: Perform self-inspection on standard part 1 through standard tank 3; open the first valve tube 5 to connect standard tank 3 with standard part 1, pressurize standard part 1, perform self-inspection on standard part 1, and check whether standard part 1 meets the range. Furthermore, while standard part 1 is pressurized, test piece 2 is also undergoing a pressurization test to detect whether the leakage of test piece 2 is too obvious. If it is too obvious, the test piece 2 can be directly discharged to reduce the workload of the instrument and improve the test efficiency.

[0030] S2: Pressurize the test piece 2 and conduct a preliminary test to see if it is qualified; the pressurization test of the test piece 2 and the pressurization calibration test of the standard piece 1 are carried out simultaneously.

[0031] S3: Compare the data of the pressurized standard part 1 with the test part 2 that has passed the preliminary test to determine whether the numerical difference is within the range of variation and whether it is good. After the test part 2 and the standard part 1 are tested, the pressurization of both is carried out at the same time. Therefore, the environmental factors of the test part 2 and the standard part 1 during the pressurization process and the post-pressurization process are the same at every moment. The test of the test part 2 and the standard part 1 will not be affected by the environmental factors. Subtract the difference between the standard part 1 and the test part 2, and record the difference at each time point. If the difference is within the range of variation, it means that the test part 2 meets the standard. If it is not within the range of variation, it does not meet the standard.

[0032] In a specific implementation manner, refer to Figure 1 , Figure 2 , wherein method S1 comprises the following steps:

[0033] S11: Inflate the standard part 1, connect the first valve tube 5 to connect the standard part 1 with the standard tank 3, and judge whether the standard part 1 is normal by observing the first pressure sensor 6. When the standard part 1 is pressurized, the standard part 1 needs to be pressurized to the same pressure as the standard tank 3, and then tested and observed by the first pressure sensor 6.

[0034] In a specific implementation manner, refer to Figure 1 , Figure 2 , wherein method S2 comprises the following steps:

[0035] S21: Test piece 2 and standard piece 1 are pressurized at the same time, and the leakage of test piece 2 is first detected to see if it meets the standard. If it does not meet the standard, it is directly judged as a fault and the alarm system is triggered at the same time. No comparison test is performed with standard piece 1. If it is qualified, it is further compared with standard piece 1. When the test piece 2 is preliminarily tested, after the test piece 2 is pressurized, if the leakage is too obvious, it will be directly judged as unqualified and an alarm will be triggered. The leakage data is judged by the pressure drop per unit time.

[0036] In a specific implementation manner, refer to Figure 1 , Figure 2 , wherein method S3 comprises the following steps:

[0037] S31: The test piece 2 and the standard piece 1 need to be isolated during the test process, and the two second pressure sensors on the tester 4 perform pressure tests on the test piece 2 and the standard piece 1 respectively and record the linear data formed per unit time;

[0038] S32: subtracting the test data of the two second pressure sensors to obtain a pressure difference;

[0039] S33: Compare the pressure difference with the specified range. If the pressure difference between the units is within the range, it means it is qualified. If the pressure difference is not within the range, it means it is unqualified.

[0040] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A battery air tightness testing device, characterized in that: The invention comprises a standard part (1), a test part (2), a standard tank (3) and a tester (4); the standard part (1) and the standard tank (3) are connected via a first valve tube (5); a first pressure sensor (6) is connected to the first valve tube (5); the standard part (1) and the test part (2) are connected via a second valve tube; and both the standard part (1) and the test part (2) are connected to the tester (4).

2. A method for testing a battery air tightness test device, the method comprising the following steps: S1: self-checking the standard component (1) through the standard tank (3); S2: Pressurize the test piece (2) and conduct a preliminary test to determine whether it is qualified; S3: Pressurize the standard part (1) and compare the data with the test part (2) that has passed the preliminary test to determine whether the value difference is within the variation range and whether it is good.

3. The method for testing the battery airtightness testing device according to claim 2, wherein method S1 comprises the following steps: S11: Inflate the standard component (1), connect the first valve pipe (5) to allow the standard component (1) to communicate with the standard tank (3), and determine whether the standard component (1) is normal by observing the first pressure sensor (6).

4. The method for testing the battery air tightness testing device according to claim 2, wherein method S2 comprises the following steps: S21: The test piece (2) and the standard piece (1) are pressurized simultaneously, and the air leakage of the test piece (2) is first detected to see whether it meets the standard. If it does not meet the standard, it is directly judged as a fault and the alarm system is triggered at the same time. No comparison test is performed with the standard piece (1). If it meets the standard, a comparison test is further performed with the standard piece (1).

5. The method for testing the battery airtightness testing device according to claim 2, wherein method S3 comprises the following steps: S31: The test piece (2) and the standard piece (1) need to be isolated during the test process, and the two second pressure sensors on the tester (4) are used to perform pressure tests on the test piece (2) and the standard piece (1) respectively and record the linear data generated per unit time; S32: subtracting the test data of the two second pressure sensors to obtain a pressure difference; S33: Compare the pressure difference with the specified range. If the pressure difference between the units is within the range, it means it is qualified. If the pressure difference is not within the range, it means it is unqualified.

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