Leak detection system and leak detection method for improving leak detection precision of battery pack
By injecting buffer into the vacuum box system, the problem of low accuracy in the existing battery pack leak detection technology is solved, and higher leakage detection accuracy and system reliability are achieved.
Patent Information
- Application Number
- CN202411244268.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-06
- Publication Date
- 2024-12-13
AI Technical Summary
In the existing battery pack leak detection technology, the airtight leak detection method has limited ability to detect small holes, the vacuum box method is costly and has low accuracy, and the sucking gun accumulation method system is simple but the accuracy is not high, making it difficult to achieve high accuracy. Minimal cavity volume.
A leak detection system including a vacuum box system is adopted, and the liquid storage tank is connected through a liquid valve and a liquid pump. Buffer is injected into the vacuum box to gather leaking gas and improve accuracy. The specific steps include placing the workpiece in the vacuum box, evacuating to a predetermined pressure, injecting the buffer, conducting leakage detection, and recovering the buffer after completion, and taking out the workpiece.
By filling the ineffective volume of the box, the leaked gas is gathered in a smaller cavity, which significantly improves the accuracy of leakage detection and the reliability of the system.
Smart Images
Figure FT_1
Abstract
Description
Technical Field
[0001] The present invention relates to a leakage detection technology, and in particular to a leakage detection system and a leakage detection method for improving the leakage detection accuracy of a battery pack. Background Art
[0002] The battery pack leak detection methods usually include airtightness leak detection, vacuum box helium detection, and sniffing gun accumulation helium detection. Among them, the airtightness leak detection method is limited by the characteristics of the package and the sensitivity of the leak detection equipment, and its ability to detect tiny leaks is quite limited. The vacuum box method requires the box to be evacuated to a lower pressure, while at the same time maintaining the internal pressure of the workpiece and the box pressure not too high to prevent damage to the workpiece, resulting in a high cost for the vacuum box system. The sniffing gun accumulation method system is simple, but due to the irregularity of the package, it is difficult to make the accumulation cavity volume very small, resulting in low accuracy of the accumulation method. Summary of the invention
[0003] In order to solve the above-mentioned deficiencies in the prior art, an object of the present invention is to provide a leak detection system and a leak detection method for improving the leak detection accuracy of a battery pack.
[0004] The technical solution adopted by the present invention to solve the technical problem is: a leak detection system for improving the leak detection accuracy of a battery pack, comprising a vacuum box system, wherein the vacuum box system is connected to a liquid storage tank via a liquid valve and a liquid pump;
[0005] The vacuum box system comprises a vacuum box, the vacuum box is connected to a leak detector via a leak detection valve, the vacuum box is connected to a vacuum pump via an evacuation valve, and the vacuum box is connected to a helium filling system via a workpiece valve.
[0006] Optionally, the vacuum box is also connected to a vent valve.
[0007] Based on the above leak detection system, the present invention also provides a leak detection method, which comprises the following steps:
[0008] S1. Open the vacuum box, put the workpiece into the vacuum box, and connect the air filling pipeline of the workpiece;
[0009] S2, close the vacuum box, open the evacuation valve, pump the pressure in the vacuum box to a predetermined pressure through the vacuum pump, and then close the vacuum pump and the evacuation valve;
[0010] S3, open the liquid valve, inject buffer into the vacuum box, and make the buffer reach a predetermined liquid level;
[0011] S4, close the liquid valve, open the leak detection valve, and the leak detector completes the leak detection on the workpiece;
[0012] S5. After the leak detection is completed, close the leak detection valve, open the vent valve and the liquid valve, and recover the buffer solution into the liquid storage tank through the liquid pump;
[0013] S6. Open the vacuum box, remove the connecting pipes, and take out the workpiece.
[0014] By adopting the above technical solution, the present invention fills the ineffective volume of the box body, so that the gas leaked from the workpiece can be gathered into a smaller cavity, thereby improving the accuracy of leak detection. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a structural schematic diagram of the leak detection system of the present invention. DETAILED DESCRIPTION
[0016] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant invention, rather than to limit the invention. It is also necessary to explain that, for ease of description, only the parts related to the invention are shown in the accompanying drawings.
[0017] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.
[0018] like Figure 1 As shown, the present invention discloses a leak detection system for improving the leak detection accuracy of a battery pack, including a vacuum box system, wherein the vacuum box system is connected to a liquid storage tank 100 via a liquid valve 110 and a liquid pump 120 .
[0019] Specifically, the vacuum box system includes a vacuum box 200, the upper part of the vacuum box 200 is connected to the leak detector 300 through a leak detection valve 310, the upper part of the vacuum box 200 is also connected to the vacuum pump 400 through an evacuation valve 410, and the vacuum box 200 is connected to the helium filling system 500 through a workpiece valve 510. In addition, the vacuum box 200 is also connected to a vent valve 210, and the vent valve 210 is used to break the vacuum box 200.
[0020] In the present invention, the bottom of the vacuum box 200 is connected to the above-mentioned liquid valve 110 through a liquid pipeline, the rear pipeline of the liquid valve 110 is connected to the liquid pump 120, and the rear pipeline of the liquid pump 120 is connected to the liquid storage tank 100, and the liquid storage tank 100 is filled with buffer solution.
[0021] Based on the above leak detection system, the present invention also provides a leak detection method, which comprises the following steps:
[0022] S1. Open the vacuum box 200, put the workpiece into the vacuum box 200, and connect the air filling pipeline of the workpiece.
[0023] S2, close the vacuum box 200, open the evacuation valve 410, and evacuate the pressure in the vacuum box 200 to a predetermined pressure through the vacuum pump 400, and then close the vacuum pump 200 and the evacuation valve 410.
[0024] S3. Open the liquid valve 110, inject buffer solution into the vacuum box 200, and make the buffer solution reach a predetermined liquid level.
[0025] S4, close the liquid valve 110, open the leak detection valve 310, and the leak detector 300 completes the leak detection on the workpiece.
[0026] S5 , after the leak detection is completed, the leak detection valve 310 is closed, the vent valve 210 and the liquid valve 110 are opened, and the buffer solution is recovered into the liquid storage tank 200 through the liquid pump 120 .
[0027] S6. Open the vacuum box 200, remove the connecting pipeline, and take out the workpiece.
[0028] In the present invention, in order to prevent the buffer solution from entering the vacuum pipeline or the leak detection pipeline, a gas-liquid separation device and a liquid level sensor can be added to the pipeline to improve the reliability of the entire system. In addition, when the buffer solution is injected into the vacuum box 200, the volume of the buffer solution injected into the vacuum box 200 can be measured by a flow meter, so that the liquid level of the buffer solution can be accurately controlled, further improving the leak detection accuracy.
[0029] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with (but not limited to) technical features with similar functions disclosed in the present application.
[0030] Except for the technical features described in the specification, the remaining technical features are known technologies to those skilled in the art. In order to highlight the innovative features of the present invention, the remaining technical features will not be described here in detail.
Claims
1. A leak detection system for improving the leak detection accuracy of a battery pack, characterized in that: It includes a vacuum box system, wherein the vacuum box system is connected to a liquid storage tank via a liquid valve and a liquid pump; The vacuum box system comprises a vacuum box, the vacuum box is connected to a leak detector via a leak detection valve, the vacuum box is connected to a vacuum pump via an evacuation valve, and the vacuum box is connected to a helium filling system via a workpiece valve.
2. The leak detection system for improving the leak detection accuracy of a battery pack according to claim 1, characterized in that: The vacuum box is also connected with a vent valve.
3. A leak detection method for a leak detection system for improving the leak detection accuracy of a battery pack as claimed in claim 2, characterized in that: The following steps are included: S1. Open the vacuum box, put the workpiece into the vacuum box, and connect the air filling pipeline of the workpiece; S2, close the vacuum box, open the evacuation valve, pump the pressure in the vacuum box to a predetermined pressure through the vacuum pump, and then close the vacuum pump and the evacuation valve; S3, open the liquid valve, inject buffer into the vacuum box, and make the buffer reach a predetermined liquid level; S4, close the liquid valve, open the leak detection valve, and the leak detector completes the leak detection on the workpiece; S5. After the leak detection is completed, close the leak detection valve, open the vent valve and the liquid valve, and recover the buffer solution into the liquid storage tank through the liquid pump; S6. Open the vacuum box, remove the connecting pipes, and take out the workpiece.