Airtightness detection device with multiple gas path branches

Abstract

The utility model discloses a kind of air-tightness detection devices with multiple gas path branch, including gas source and following branch combination: first branch, second branch and third branch;Second branch includes second valve and second pressure sensor;The output end of gas source is connected with second valve, and second pressure sensor is set in the output end of second valve;First branch includes first valve, booster and first pressure sensor;The output end of gas source is sequentially connected with first valve and booster, and first pressure sensor is set in the output end of booster;Third branch includes third valve, pressure reducer and third pressure sensor;The output end of gas source is sequentially connected with third valve and pressure reducer, and third pressure sensor is set in the output end of pressure reducer.Second branch carries out the air-tightness detection of normal air pressure, first branch carries out the air-tightness detection of high pressure, third branch carries out the air-tightness detection of low pressure, improve applicability, and the air-tightness of multiple different components of battery pack can be detected.

Description

Technical Field

[0001] This utility model relates to the field of airtightness testing technology, specifically to an airtightness testing device with multiple air path branches. Background Technology

[0002] Battery packs typically undergo airtightness testing before being installed in vehicles. This testing detects manufacturing defects and reduces potential safety hazards. For example, airtightness tests are performed on the battery pack casing, liquid cooling pipes, and direct cooling pipes. However, the maximum test pressure varies depending on the component being tested.

[0003] The patent with publication number CN223346377U discloses a battery pack airtightness testing device. The operation of the vacuum pump opens another one-way valve, and the pressure value inside the inner box is observed by a pressure gauge. The vacuum pump is turned off after drawing a vacuum into the inner box. The test is performed by negative pressure. It requires a test box and cannot adapt to the test requirements of various pressures. Utility Model Content

[0004] To address the aforementioned technical problems in the existing technology, this utility model provides an airtightness testing device with multiple air path branches, which is applicable to various testing pressures and improves applicability.

[0005] This utility model discloses an airtightness detection device with multiple air path branches, including an air source and a combination of the following branches: a first branch, a second branch, and a third branch; the second branch includes a second valve and a second pressure sensor; the output end of the air source is connected to the second valve, and the second pressure sensor is disposed at the output end of the second valve; the first branch includes a first valve, a booster, and a first pressure sensor; the output end of the air source is sequentially connected to the first valve and the booster, and the first pressure sensor is disposed at the output end of the booster; the third branch includes a third valve, a pressure reducer, and a third pressure sensor; the output end of the air source is sequentially connected to the third valve and the pressure reducer, and the third pressure sensor is disposed at the output end of the pressure reducer.

[0006] Preferably, the output end of the booster, the output end of the pressure reducer, and the output end of the second valve are connected to the first detection end.

[0007] Preferably, the output end of the booster, the output end of the pressure reducer, and the output end of the second valve are respectively provided with a first check valve, a second check valve, and a third check valve;

[0008] The outputs of the first check valve, the second check valve, and the third check valve are connected to the first detection terminal.

[0009] Preferably, the output end of the booster is connected to the first detection end; the output end of the pressure reducer is connected to the third detection end; and the output end of the second valve is connected to the second detection end.

[0010] Preferably, the pressure range of the first branch output is 155-2000 kPa; the pressure range of the second branch output is 50-500 kPa; and the pressure range of the third branch output is 1-10 kPa.

[0011] Preferably, the first branch, the second branch, and the third branch can be disposed inside the housing, and the first detection end, the second detection end, and the third detection end are disposed on the side wall of the housing.

[0012] Preferably, the output end of the gas source is also equipped with a dryer and a pressure gauge.

[0013] Preferably, the pressure reducer is a pressure reducing valve; the dryer is a drying tube.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: the second branch can perform air tightness testing under normal air pressure, the first branch can perform air tightness testing under high pressure, and the third branch can perform air tightness testing under low pressure, thereby improving applicability and enabling air tightness testing of multiple different components / items of the battery pack. Attached Figure Description

[0015] Figure 1 This is a logic block diagram of the airtightness testing device in Example 1;

[0016] Figure 2 This is a logic block diagram of the airtightness detection device in Example 2.

[0017] The diagram shows: 1. Air source; 11. Dryer; 12. Pressure gauge; 15. Housing.

[0018] 2. First branch; 21. First valve; 22. Intensifier; 25. First pressure sensor; 26. First check valve; 27. First detection end;

[0019] 3. Second branch; 31. Second valve; 35. Second pressure sensor; 36. Second check valve; 37. Second detection end;

[0020] 4. Third branch; 41. Third valve; 42. Pressure reducer; 45. Third pressure sensor; 46. Third check valve; 47. Third detection end. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0022] The present invention will now be described in further detail with reference to the accompanying drawings:

[0023] Example 1 provides an airtightness testing device with multiple air path branches, such as Figure 1 As shown, it includes gas source 1 and a combination of the following branches: second branch 3, first branch 2 and third branch 4;

[0024] The second branch 3 includes a second valve 31 and a second pressure sensor 35; the output end of the gas source 1 is connected in sequence to the second valve 31 and the second detection end 37, and the second pressure sensor 35 is set at the output end of the second valve 31.

[0025] The first branch 2 includes a first valve 21, a booster 22 and a first pressure sensor 25; the output end of the air source 1 is connected in sequence to the first valve 21, the booster 22 and the first detection end 27, and the first pressure sensor 25 is located at the output end of the booster 22;

[0026] The third branch 4 includes a third valve 41, a pressure reducer 42, and a third pressure sensor 45; the output end of the gas source 1 is connected in sequence to the third valve 41, the pressure reducer 42, and the third detection end 47, and the third pressure sensor 45 is located at the output end of the pressure reducer 42.

[0027] The second branch 3 can perform airtightness testing at normal pressures, the first branch 2 performs airtightness testing at high pressures, and the third branch 4 performs airtightness testing at low pressures, improving applicability and enabling airtightness testing of multiple different components / items of the battery pack. It can meet the requirements of various air pressures.

[0028] The pressure range of the first detection end 27 of the first branch 2 is 155-2000 kPa, which can be used for direct cooling pipeline testing; the pressure range of the output of the second branch 3 is 50-500 kPa, which can be used for liquid cooling pipeline testing; and the pressure range of the output of the third detection end 47 of the third branch 4 is 1-10 kPa, which can be used for battery pack casing testing.

[0029] There are four main cooling methods for battery packs: natural cooling, air cooling, liquid cooling, and direct cooling.

[0030] Liquid cooling is the mainstream cooling method used in electric vehicles. It removes heat from the battery through the circulation of coolant, resulting in high heat dissipation efficiency. However, liquid cooling has a complex structure, high cost, and requires regular maintenance of the coolant.

[0031] Direct cooling (refrigerant direct cooling) uses air conditioning refrigerant to directly cool the battery pack, with a heat dissipation efficiency more than three times that of liquid cooling. It is also smaller in size and relatively cheaper. It is especially suitable for high-performance electric vehicles or fast charging scenarios, but the system pressure is high and the technical requirements are stringent.

[0032] The output end of the gas source 1 is also equipped with a dryer 11 and a pressure gauge 12. The pressure reducer 42 can be a pressure reducing valve; the dryer 11 is a drying tube. The first branch 2, the second branch 3 and the third branch 4 can be set inside the housing 15, and the first detection end 27, the second detection end 37 and the third detection end 47 are set on the side wall of the housing 15.

[0033] The first pressure sensor 25, the second pressure sensor 35, and the third pressure sensor 45 have different ranges and are adapted to the pressure range of their respective branches.

[0034] The specific workflow includes the following steps:

[0035] Step 101: Connect the gas lines of the battery pack. Connect the corresponding test ports according to the test object.

[0036] Step 102: Select the appropriate test parameters and start the gas source.

[0037] Step 103: Based on the test, open the corresponding valves and detection ports to inject gas into the test object.

[0038] Step 104: After the gas injection is completed, wait for the gas pressure to stabilize.

[0039] Step 105: Record the air pressure value P1 at the start of the test and record the air pressure value P2 at the end of the test time T to obtain the pressure difference P1-P2.

[0040] Step 106: Determine whether the test result passes or fails based on the set leakage flow rate range.

[0041] The volumetric leakage flow rate under operating conditions is expressed as: ΔP=P1-P2

[0042] P represents the absolute gas pressure in Pa, obtained from the corresponding pressure sensor; V represents the volume of the battery pack being measured (m³). 3 Assuming the mass remains constant, leakage leads to a decrease in mass, and the negative sign indicates that the mass inside the container is decreasing; Δt represents the duration of the test.

[0043] Example 2, as Figure 2Unlike Embodiment 1, only one detection end is provided: a first detection end 27, the output end of the booster 22, the output end of the second valve 31 and the output end of the pressure reducer 42 are connected to the first detection end 27.

[0044] When performing a test, only one branch is opened, while the valves of the other branches are closed.

[0045] The first pressure sensor 25 is provided with a first check valve 26 downstream; the second pressure sensor 35 is provided with a second check valve 36 downstream; and the third pressure sensor 45 is provided with a third check valve 46 downstream, which can prevent damage to the pressure sensors when switching branches and pressures.

[0046] This invention features three branches equipped with pressure sensors of different ranges, ensuring the safety and accuracy of the gas path branches. A pre-dryer 11 / drying tube filters out moisture from the gas source 1, reducing its impact on the measured object. It offers an ultra-wide range of gas pressure output and detection capabilities. In one specific embodiment, the housing 15 is convenient for carrying and transporting. The direct pressure detection principle reduces the size and operational complexity of the equipment.

[0047] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An airtightness testing device with multiple air path branches, characterized in that, It includes a gas source (1) and a combination of the following branches: first branch (2), second branch (3) and third branch (4); The second branch (3) includes a second valve (31) and a second pressure sensor (35); the output end of the air source (1) is connected to the second valve (31), and the second pressure sensor (35) is located at the output end of the second valve (31); The first branch (2) includes a first valve (21), a booster (22) and a first pressure sensor (25); the output end of the air source (1) is connected to the first valve (21) and the booster (22) in sequence, and the first pressure sensor (25) is located at the output end of the booster (22); The third branch (4) includes a third valve (41), a pressure reducer (42) and a third pressure sensor (45); the output end of the gas source (1) is connected to the third valve (41) and the pressure reducer (42) in sequence, and the third pressure sensor (45) is set at the output end of the pressure reducer (42).

2. The airtightness testing device according to claim 1, characterized in that, The output ends of the booster (22), the pressure reducer (42), and the second valve (31) are connected to the first detection end (27).

3. The airtightness testing device according to claim 2, characterized in that, The output ends of the booster (22), the pressure reducer (42), and the second valve (31) are respectively provided with a first check valve (26), a second check valve (36), and a third check valve (46); The output terminals of the first check valve (26), the second check valve (36), and the third check valve (46) are connected to the first detection terminal (27).

4. The airtightness testing device according to claim 1, characterized in that, The output end of the booster (22) is connected to the first detection end (27); the output end of the pressure reducer (42) is connected to the third detection end (47); and the output end of the second valve (31) is connected to the second detection end (37).

5. The airtightness testing device according to claim 1, characterized in that, The pressure range of the first branch (2) is 155-2000 kPa; the pressure range of the second branch (3) is 50-500 kPa; and the pressure range of the third branch (4) is 1-10 kPa.

6. The airtightness testing device according to claim 1, characterized in that, The first branch (2), the second branch (3) and the third branch (4) can be set inside the housing (15), and the first detection end (27), the second detection end (37) and the third detection end (47) are set on the side wall of the housing (15).

7. The airtightness testing device according to claim 1, characterized in that, A dryer (11) and a pressure gauge (12) are also provided at the output end of the gas source (1).

8. The airtightness testing device according to claim 7, characterized in that, The pressure reducer (42) is a pressure reducing valve; the dryer (11) is a drying tube.

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