Leak detection device for two-wheeler battery pack

Abstract

The utility model discloses a kind of air tightness leak detection devices for two-wheeled vehicle battery pack, including first valve, gas tank, second valve and tool container;The output end of gas source is sequentially connected with first valve, gas tank and second valve;The output end of second valve is communicated with the containing cavity of tool container;Containing cavity is used to install battery pack;The output end of gas tank is provided with air pressure sensor.Gas is filled into gas tank from gas source, then first valve is closed, second valve is opened, gas in gas tank enters into containing cavity, and according to the volume of containing cavity and battery pack, and pressure change, the air tightness of battery pack is detected.

Description

Technical Field

[0001] This utility model relates to the field of airtightness testing technology, specifically to an airtightness leak detection device for two-wheeled vehicle battery packs. Background Technology

[0002] The waterproof, dustproof, and airtight design of the battery pack casing for new energy two-wheeled vehicles is crucial for the safe operation of the battery pack, and its core lies in meeting the IP67 or higher protection level requirements. While electric vehicle battery packs can undergo airtightness leak testing by injecting gas through an explosion-proof valve, two-wheeled vehicle battery packs lack explosion-proof valves, making it difficult to inject gas into the battery pack for testing.

[0003] CN223346377U discloses a battery pack airtightness testing device. After pressurizing the inner chamber for a specified time, the booster pump stops working, and one of the one-way valves closes. The pressure value on the pressure gauge is recorded at this time, and the pressure value on the pressure gauge is observed through a transparent testing box to see if it drops. If the pressure value drops, it indicates that gas has entered the new energy vehicle battery pack. However, the testing box requires a specific inner chamber, which is structurally complex and costly; moreover, the testing is performed using a constant pressure method, making the testing method relatively simple. Utility Model Content

[0004] In view of the above-mentioned technical problems existing in the prior art, this utility model provides an airtightness leak detection device for two-wheeled vehicle battery packs, which can perform airtightness testing on battery packs through various detection methods.

[0005] This utility model discloses an airtightness leak detection device for a two-wheeled vehicle battery pack, including a first valve, a gas tank, a second valve, and a tooling container; the output end of the gas source is connected to the first valve, the gas tank, and the second valve in sequence; the output end of the second valve is connected to the receiving cavity of the tooling container; the receiving cavity is used to install the battery pack;

[0006] A pressure sensor is installed at the output end of the gas tank.

[0007] Preferably, an oil-water separator is also provided at the input end of the first valve.

[0008] Preferably, the output end of the second valve is provided with a detection port, which is connected to the tooling container through a connecting pipe.

[0009] Preferably, the device also includes a housing, with the oil-water separator, first valve, air tank, air pressure sensor, and second valve housed within the housing; the detection port is located on the side wall of the housing.

[0010] Preferably, the gas source output pressure is 0.5 MPa.

[0011] Preferably, the volume of the gas cylinder is 0.5-0.8L.

[0012] Preferably, it also includes a third valve, the input end of the second valve is connected to the input end of the third valve, and the output end of the third valve is connected to the exhaust port.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: the gas source fills the gas tank with gas, then closes the first valve and opens the second valve, and the gas in the gas tank enters the containment cavity. Based on the volume of the containment cavity and the battery pack, as well as the pressure change, the airtightness of the battery pack is detected. Attached Figure Description

[0014] Figure 1 This is a logic block diagram of the airtightness leak detection device for a two-wheeled vehicle battery pack in Example 1;

[0015] Figure 2 This is a logic block diagram of the airtightness leak detection device in Example 2.

[0016] The markings in the diagram are: 1. Air source; 2. Oil-water separator; 3. First valve; 4. Air tank; 5. Air pressure sensor; 6. Second valve; 7. Third valve; 8. Detection port; 9. Exhaust port; 11. Tooling container; 12. Battery pack; 13. Air tightness leak detection device; 14. Receiving cavity. Detailed Implementation

[0017] 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.

[0018] The present invention will now be described in further detail with reference to the accompanying drawings:

[0019] Example 1 provides an airtightness leak detection device 13 for a two-wheeled vehicle battery pack 12, such as Figure 1 As shown, it includes a first valve 3, a gas tank 4, a second valve 6, and a tooling container 11;

[0020] The output end of the gas source 1 is connected in sequence to the first valve 3, the gas tank 4, and the second valve 6; the output end of the second valve 6 is connected to the receiving cavity 14 of the tooling container 11; the battery pack 12 is installed in the receiving cavity 14.

[0021] A pressure sensor 5 is installed at the output end of the gas tank 4.

[0022] Gas source 1 fills gas tank 4 with gas at a certain pressure, such as 10 kPa gas. Then, the first valve 3 is closed and the second valve 6 is opened. The gas in gas tank 4 enters the receiving cavity 14. The airtightness of the battery pack 12 is tested based on the volume of the receiving cavity 14 and the battery pack 12, as well as the pressure change.

[0023] Specifically, after inflation, the gas pressure of the gas tank 4 is P1, and the volume of the gas tank 4 is V0; the stable pressure of the gas after entering the containment cavity 14 is P2; the volume of the containment cavity 14 is V1, the volume of the battery pack 12 is V2, and the empty volume of the containment cavity 14 is V3 = V1 - V2.

[0024] According to the law of conservation of mass and the ideal gas equation PV=nRT, if nRT remains constant during the test, we know that: P1*V0=P2*(V0+V3+V5).

[0025] The leakage volume V5 is calculated as follows: V5 = P1 * V0 / P2 - V0 - V3.

[0026] When V5 exceeds the threshold, an air leak is detected. The volume of the leak can be determined through airtightness testing.

[0027] This invention can also perform constant pressure testing: First valve 3 and second valve 6 are opened, and gas is introduced into the gas tank 4 and tooling container 11 through the gas source 1; after inflation, first valve 3 is closed, and the gas pressure value P3 is recorded; after a certain period of time, the gas pressure value P4 is recorded, and the airtightness of the battery pack 12 is judged based on the pressure difference (P3-P4). The judgment standard is determined according to the actual test conditions; a large leak results in a large difference, while a minor leak results in a very small difference. After the test, the gas in the tooling container 11 is removed.

[0028] The first valve 3 has an oil-water separator 2 at its input end; the second valve 6 has a detection port 8 at its output end, which is connected to the tooling container 11 via a connecting pipe. Specifically, the output pressure of the air source 1 is 0.1-0.5 MPa, and the volume of the air tank 4 is 0.5-0.8 L, but not limited to these values. The air source 1 output may also be equipped with a pressure reducing valve; specifically, the output end of the air source 1 is connected sequentially to the oil-water separator 2, the pressure reducing valve, the first valve 3, and the air tank 4.

[0029] The airtightness leak detection device 13 also includes a housing, an oil-water separator 2, a first valve 3, an air tank 4, an air pressure sensor 5, and a second valve 6, all housed inside the housing; the detection port 8 is located on the side wall of the housing.

[0030] Example 2, as Figure 2As shown, it also includes an exhaust gas path: the input end of the second valve 6 is connected to the input end of the third valve 7, and the output end of the third valve 7 is connected to the exhaust port 9. During the airtightness test, the third valve 7 is closed; after the test, the third valve 7 is opened to release the internal high-pressure gas.

[0031] In one specific embodiment, the tooling container 11 includes a main body and a cover detachably mounted on the main body, with a sealing gasket provided between the cover and the main body to improve the seal between the cover and the main body. However, the structure of the tooling container 11 is not limited to this. The main body of the tooling container 11 can be uniform, and it is not necessary to manufacture different tooling containers 11 according to different battery packs.

[0032] The leak volume can be detected first, followed by a constant pressure test, enabling both qualitative and quantitative airtightness testing. This invention has the advantage of simple operation, reducing the learning cost for users.

[0033] 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. A leak detection device for a two-wheeled vehicle battery pack, characterized in that, It includes a first valve (3), a gas tank (4), a second valve (6), and a tooling container (11); The output end of the gas source (1) is connected in sequence to the first valve (3), the gas tank (4), and the second valve (6); the output end of the second valve (6) is connected to the receiving cavity (14) of the tooling container (11); the receiving cavity (14) is used to install the battery pack (12); A pressure sensor (5) is installed at the output end of the gas tank (4).

2. The airtightness leak detection device according to claim 1, characterized in that, An oil-water separator (2) is also provided at the input end of the first valve (3).

3. The airtightness leak detection device according to claim 2, characterized in that, The output end of the second valve (6) is provided with a detection port (8), which is connected to the tooling container (11) through a connecting pipe.

4. The airtightness leak detection device according to claim 3, characterized in that, It also includes a housing, an oil-water separator (2), a first valve (3), a gas tank (4), a pressure sensor (5), and a second valve (6) installed inside the housing; a detection port (8) is installed on the side wall of the housing.

5. The airtightness leak detection device according to claim 1, characterized in that, The output pressure of the gas source (1) is 0.5 MPa.

6. The airtightness leak detection device according to claim 1, characterized in that, The volume of the gas tank (4) is 0.5-0.8L.

7. The airtightness leak detection device according to any one of claims 1-6, characterized in that, It also includes a third valve (7), the input end of the second valve (6) is connected to the input end of the third valve (7), and the output end of the third valve (7) is connected to the exhaust port (9).

8. The airtightness leak detection device according to claim 7, characterized in that, It also includes a pressure reducing valve, and the output end of the gas source is connected in sequence to the oil-water separator, the pressure reducing valve, the first valve and the gas tank.

Images