Leakage detection system
By designing a leak detection system for the fixed seat and shell, using the partition structure of air injection holes and leakage detection holes, the problem of deformation of the power battery case during the detection process is solved, high sealing and accurate weld detection are achieved, and the battery is improved security.
Patent Information
- Application Number
- CN202323284243.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-01
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2033-12-01
AI Technical Summary
In the prior art, the end surface of the liquid injection hole cannot provide sufficient support force, which causes the power battery shell to deform during the detection process, affecting the accuracy of the sealing nail welding and welding effect detection, especially in the case and top cover with very thin thickness. In case.
Design a leak detection system, including a fixed seat and a shell, with air injection holes installed on the shell, and leak detection holes installed on the fixed seat. The power battery case is placed in the groove to form a closed space, and partition the leak detection holes and air injection holes, and passes through vacuuming. and inject detection gas to detect whether there is leakage in the weld.
The sealing effect without deformation is achieved, and the injection cylinder and detector are prevented from directly contacting the power battery case, preventing the shell from deforming under large pressure, and improving the accuracy and safety of weld detection.
Smart Images
Figure CN222144400U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of battery detection, in particular to a leakage detection system. Background Art
[0002] In the existing leakage detection equipment, especially in power batteries, the square aluminum shell is vacuumed and then gas is injected through the injection hole to detect the welding effect of the weld in the top cover welding and whether there is leakage; this method requires the end face of the injection hole to provide sufficient supporting force to support the gas injection cylinder to inject gas without leakage while keeping the injection hole from deformation, because the deformation of the injection hole will affect the visual positioning of the sealing pin behind.
[0003] With the improvement of manufacturing technology in recent years, steel-shell batteries have improved energy density while taking into account safety performance; especially for 3C consumer batteries, customers have requirements for battery size and weight. If the same energy density as soft packs is required, the shell and top cover thickness must be very thin, about 0.1-1mm. At this time, the injection hole sealing method is no longer applicable, and the end face of the injection hole cannot provide sufficient supporting force, and the injection hole will be deformed to affect the welding of the sealing pin; this brings great difficulties to the detection of the sealing effect of the shell and the top cover.
[0004] Therefore, it is very important for those skilled in the art to design a leak detection system that does not deform and has good sealing effect. Utility Model Content
[0005] The technical problem to be solved by the embodiments of the utility model is to provide a leak detection system that does not deform and has good sealing effect, so as to solve the problem in the prior art that the end face of the injection hole cannot provide sufficient supporting force and the deformation of the injection hole will affect the welding of the sealing pin.
[0006] The utility model discloses a leak detection system for detecting welds of power battery shells, and the scheme is that it comprises: a fixing seat and an outer shell with an inner cavity; the fixing seat is arranged in the inner cavity of the outer shell to fix the power battery shell; the outer shell is provided with an injection hole, the fixing seat is provided with a groove for accommodating the power battery shell, and the groove is provided with a leak detection hole for leak detection; the power battery shell is placed in the groove, and the flange edge of the power battery shell is fitted with the surface of the fixing seat to separate the leak detection hole and the injection hole.
[0007] Optionally, the power battery case includes a shell and a top cover, the shell is provided with a flange edge on the periphery, and the top cover is connected to the shell through the flange edge.
[0008] Optionally, a sealing ring is provided between the surface of the fixing seat and the flange edge of the power battery shell.
[0009] Optionally, the diameter of the sealing ring is larger than the diameter of the groove.
[0010] Optionally, the diameter of the sealing ring is less than or equal to the diameter of the flange edge of the power battery shell.
[0011] Optionally, the outer diameter of the groove is adapted to the shell diameter of the power battery shell.
[0012] Optionally, the bottom of the fixing seat is arranged to fit the bottom of the inner cavity of the shell, and the leak detection hole is arranged at the bottom of the groove and extends to the outside of the shell.
[0013] Optionally, the gas injection hole is arranged on a side of the shell and away from the fixing seat.
[0014] Optionally, it further comprises a gas injection cylinder for injecting the detection gas, and the output end of the gas injection cylinder is connected to the gas injection hole.
[0015] Optionally, a leak detector for gas leakage detection is further included, and an input end of the leak detector is connected to the leak detection hole.
[0016] Compared with the prior art, the beneficial effect of the leak detection system provided by the embodiment of the utility model is that: by designing a leak detection system with a fixed seat and a shell, and arranging an injection hole on the shell, and arranging a leak detection hole on the fixed seat, and then placing the power battery shell in the groove of the fixed seat, a closed space is formed between the groove and the power battery shell to separate the leak detection hole and the gas injection hole, and then after the inner cavity of the shell and the groove are evacuated, the detection gas is injected into the inner cavity of the shell, and by detecting whether the detection gas passes through the power battery shell into the closed space and then enters the leak detection hole, it can be effectively detected whether the power battery shell is leaking, thereby detecting whether there is a weld in the welding of the power battery shell; in this detection method, not only is the sealing good, but the gas injection cylinder and the detector will not directly contact the power battery shell, and there is no need to seal the injection hole of the power battery shell, which effectively prevents the power battery shell from deforming under high pressure. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] The technical solution of the utility model will be further described in detail below with reference to the accompanying drawings and embodiments, in which:
[0018] Figure 1 It is a structural schematic diagram of a leak detection system provided by an embodiment of the utility model;
[0019] Figure 2 It is a structural schematic diagram of a fixing base provided in an embodiment of the utility model;
[0020] Figure 3 It is a schematic diagram of the structure of a power battery case provided by an embodiment of the utility model. DETAILED DESCRIPTION
[0021] 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. Now, in conjunction with the accompanying drawings, a preferred embodiment of the present utility model is described in detail.
[0022] like Figures 1 to 3 As shown, the utility model provides a specific embodiment of a leak detection system.
[0023] A leak detection system for detecting the weld seam of a power battery shell 3, reference Figure 1 and Figure 3 The leak detection system includes: a fixing seat 1 and a shell 2 with an inner cavity 21; the fixing seat 1 is arranged in the inner cavity 21 of the shell 2 to fix the power battery shell 3; the shell 2 is provided with a gas injection hole 22, and the fixing seat 1 is provided with a groove 11 for accommodating the power battery shell 3, and the groove 11 is provided with a leak detection hole 12 for leak detection; the power battery shell 3 is placed in the groove 11, and the flange edge 31 of the power battery shell 3 is in contact with the surface of the fixing seat 1 to separate the leak detection hole 12 and the gas injection hole 22.
[0024] Specifically, refer to Figure 1 and Figure 3 The power battery is an important component for storing and releasing electrical energy for use in electric vehicles or hybrid vehicles; the power battery shell 3 will be subjected to weld inspection before leaving the factory. The quality and reliability of the weld are crucial to the performance and safety of the battery. The power battery shell 3 includes a shell 32, a top cover 33 and a flange 31. The top cover 33 is welded to the shell 32 through the flange 31; the weld inspection is mainly to inspect and evaluate the welds on the top cover 33 of the power battery shell 3; the above-mentioned leak detection system is mainly used for weld inspection of the power battery shell 3.
[0025] Further, refer to Figure 1 and Figure 3 The outer shell 2 is provided with an inner cavity 21 for accommodating the fixing seat 1. The fixing seat 1 is fixedly arranged in the inner cavity 21. The outer shell 2 is also provided with a gas injection hole 22. The gas injection hole 22 is arranged away from the fixing seat 1, that is, the gas injection hole 22 is only connected with the inner cavity 21 of the outer shell 2, but not with the fixing seat 1. The gas injection hole 22 is mainly used for evacuating the inner cavity 21 of the outer shell 2 and injecting detection gas into the inner cavity 21 of the outer shell 2.
[0026] Further, refer to Figure 1 and Figure 3The fixing seat 1 is mainly used to fix the power battery shell 3. The fixing seat 1 is provided with a groove 11 for accommodating the power battery shell 3. When the weld of the power battery shell 3 is detected, the power battery shell 3 is placed in the groove 11, and the flange edge 31 of the power battery shell 3 is fitted with the surface of the fixing seat 1, so that a closed space is formed between the power battery shell 3 and the groove 11; the fixing seat 1 is also provided with a leak detection hole 12, and the leak detection hole 12 is not connected with the inner cavity 21 of the outer shell 2, so as to evacuate the closed space between the power battery shell 3 and the groove 11 and detect whether the gas injected into the inner cavity 21 of the outer shell 2 passes through the power battery shell 3 and enters the closed space, so as to determine whether there is a weld in the power battery shell 3.
[0027] The existing power battery shell weld detection method is a liquid injection hole sealing method. After the shell cover of the power battery shell is sealed, the power battery shell is placed in the cavity, and the inside of the power battery shell is evacuated and injected with detection gas through the liquid injection hole of the power battery shell. Whether there is a weld in the power battery shell is determined by whether there is detection gas leaking in the cavity; this method requires the liquid injection hole of the power battery shell 3 to be sealed to prevent the detection gas from leaking from the connection of the liquid injection hole to the cavity and causing misjudgment, and when sealing the liquid injection hole, a sufficiently large pressure is required to make the rubber plug fit more closely to the liquid injection hole to ensure the sealing. In this way, for some relatively thin power battery shells, under the action of large pressure, the liquid injection hole of the power battery shell is easily deformed to affect the welding of the sealing nail; this brings great difficulties to the sealing effect detection of the power battery, which will directly affect the safety of the power battery.
[0028] In this embodiment, a leak detection system with a fixed seat and a shell is designed, and an injection hole is arranged on the shell, and a leak detection hole is arranged on the fixed seat, and then a power battery shell is placed in the groove of the fixed seat, so that a closed space is formed between the groove and the power battery shell to separate the leak detection hole and the injection hole, and then the inner cavity of the shell and the groove are evacuated, and then a detection gas is injected into the inner cavity of the shell, and by detecting whether the detection gas passes through the power battery shell into the closed space and then enters the leak detection hole, it can be effectively detected whether the power battery shell is leaking, thereby detecting whether there is a weld in the welding of the power battery shell; in this detection method, not only is the sealing good, but the injection cylinder and the detector will not directly contact the power battery shell, and there is no need to seal the injection hole of the power battery shell, which effectively prevents the power battery shell from deforming under high pressure.
[0029] In one of the embodiments, the detection gas is helium; however, it should be noted that the detection gas is not limited to helium, but may also be other gases that can be used for detection.
[0030] In one embodiment, reference Figure 2A sealing ring 13 is provided between the surface of the fixing seat 1 and the flange edge 31 of the power battery shell 3 .
[0031] Specifically, refer to Figures 1 to 3 When the power battery is placed in the groove 11 of the fixing seat 1 and the flange edge 31 of the power battery shell 3 is fitted with the surface of the fixing seat 1, a gap is likely to exist between the flange edge 31 of the power battery shell 3 and the fixing seat 1, and there is a risk of detection gas leakage in the gap. By providing a sealing ring 13 between the power battery shell 3 and the surface of the fixing seat 1, the sealing of the enclosed space formed between the power battery shell 3 and the groove 11 of the fixing seat 1 can be effectively improved, thereby further ensuring the accuracy of the detection result.
[0032] In one embodiment, reference Figure 2 The sealing ring 13 and the fixing seat 1 are detachably arranged.
[0033] Specifically, refer to Figures 1 to 3 In order to improve the practicality of the leak detection system and enable the leak detection system to adapt to more different types of power battery shells 3, in this embodiment, the sealing ring 13 is set to be detachable, and a sealing ring 13 of a corresponding size can be selected for assembly according to the position and size of the flange edge 31 of the power battery shell 3 to be detected.
[0034] In one embodiment, reference Figure 3 , the diameter of the sealing ring 13 is greater than the diameter of the groove 11 ; and the diameter of the sealing ring 13 is less than or equal to the diameter of the flange edge 31 of the power battery shell 3 .
[0035] Specifically, refer to Figures 1 to 3 If the diameter of the sealing ring 13 is too large or too small, there will be a gap between the sealing ring 13 and the flange edge 31, which may easily lead to poor sealing effect and difficulty in sealing.
[0036] In one embodiment, reference Figures 1 to 3 The outer diameter of the groove 11 is adapted to the diameter of the shell 32 of the power battery shell 3 .
[0037] Specifically, refer to Figures 1 to 3 By setting the outer diameter of the groove 11 to be compatible with the diameter of the shell 32 of the power battery shell 3, the gap between the inner wall of the groove 11 and the shell 32 of the power battery shell 3 can be effectively reduced, and the gas injection hole 22 and the leak detection hole 12 can be better isolated, thereby improving the detection quality.
[0038] In one embodiment, reference Figures 1 to 3 The bottom of the fixing seat 1 is fitted with the bottom of the inner cavity 21 of the outer shell 2 , and the leak detection hole 12 is arranged at the bottom of the groove 11 and extends to the outside of the outer shell 2 .
[0039] Specifically, refer to Figures 1 to 3 By setting the leak detection hole 12 at the bottom of the groove 11 and setting the bottom of the fixing base 1 to fit with the bottom of the inner cavity 21 of the shell 2, the gap between the leak detection hole 12 and the inner cavity 21 of the shell 2 can be effectively eliminated to prevent the detection gas from entering the leak detection hole 12 from the inner cavity 21, thereby improving the detection quality.
[0040] In one embodiment, reference Figure 1 The air injection hole 22 is arranged on the side of the shell 2 and away from the fixing seat 1.
[0041] Specifically, refer to Figure 1 The gas injection hole 22 is arranged away from the fixing seat 1. When the power battery shell 3 is placed in the groove 11, the gas injection hole 22 and the leak detection hole 12 can be effectively isolated, thereby improving the detection quality.
[0042] In one embodiment, the leak detection system further includes a gas injection cylinder for injecting the detection gas, and the output end of the gas injection cylinder is connected to the gas injection hole 22 .
[0043] In one embodiment, the leak detection system further includes a leak detector for leak detection, and an input end of the leak detector is connected to the leak detection hole 12 .
[0044] It should be understood that the above embodiments are only used to illustrate the technical solutions of the present utility model rather than to limit it. For those skilled in the art, the technical solutions described in the above embodiments can be modified, or some of the technical features therein can be replaced by equivalents; and all these modifications and replacements should fall within the scope of protection of the claims attached to the present utility model.
Claims
1. A leak detection system for detecting the weld of a power battery shell, characterized in that: include: A fixing seat and an outer shell with an inner cavity; the fixing seat is arranged in the inner cavity of the outer shell to fix the power battery shell; the outer shell is provided with an injection hole, the fixing seat is provided with a groove for accommodating the power battery shell, and the groove is provided with a leak detection hole for leak detection; the power battery shell is placed in the groove, and the flange edge of the power battery shell is fitted with the surface of the fixing seat to separate the leak detection hole and the gas injection hole.
2. The leak detection system according to claim 1, characterized in that: A sealing ring is arranged between the surface of the fixing seat and the flange edge of the power battery shell.
3. The leak detection system according to claim 2, characterized in that: The sealing ring and the fixing seat are detachably arranged.
4. The leak detection system according to claim 2, characterized in that: The diameter of the sealing ring is greater than the diameter of the groove.
5. The leak detection system according to claim 3, characterized in that: The diameter of the sealing ring is less than or equal to the diameter of the flange edge of the power battery shell.
6. The leak detection system according to claim 5, characterized in that: The outer diameter of the groove is adapted to the shell diameter of the power battery shell.
7. The leak detection system according to claim 1, characterized in that: The bottom of the fixing seat is arranged in close contact with the bottom of the inner cavity of the shell, and the leak detection hole is arranged at the bottom of the groove and extends to the outside of the shell.
8. The leak detection system according to claim 1, characterized in that: The air injection hole is arranged on the side of the shell and avoids the fixing seat.
9. The leak detection system according to claim 1, characterized in that: It also includes a gas injection cylinder for injecting detection gas, and the output end of the gas injection cylinder is connected to the gas injection hole.
10. The leak detection system according to claim 1, characterized in that: It also includes a leak detector for gas leakage detection, and the input end of the leak detector is connected to the leak detection hole.