Helium leak test fixture

Abstract

The utility model provides a kind of airtightness helium detection test tool jig, for detecting the airtightness of product, including support seat and lower die assembly and upper die assembly.Support seat includes base and support.Lower die assembly is set on base, including lower die seat and sealing support piece, lower die seat is internally provided with installation groove, first cavity, detection channel and inflation channel, installation groove is communicated in detection channel, first cavity is communicated in inflation channel, and first cavity is communicated in installation groove.Sealing support piece is internally provided with detection cavity, sealing support piece is installed in installation groove and makes detection cavity be communicated in detection channel, product is placed on sealing support piece to insulate detection cavity and first cavity.Upper die assembly is slidably set on support, including upper die seat, second cavity is internally provided in upper die seat, upper die seat is slidably close to lower die seat and is attached to lower die seat, to make upper die seat and lower die seat between sealed arrangement, and make first cavity and second cavity form inflation cavity that is communicated in inflation channel.

Description

Technical Field

[0001] This utility model relates to the field of battery cell manufacturing technology, and in particular to a gas tightness helium testing fixture. Background Technology

[0002] The battery cell is the core component of a battery, a basic unit system capable of directly converting chemical energy into electrical energy. A battery cell includes internal components such as the positive and negative electrodes, separator, and electrolyte, as well as the outer casing for encapsulation. Generally, in the encapsulation of square steel or aluminum-cased battery cells, after the riveting process of the positive and negative electrode posts on the cover plate, the airtightness of the cell needs to be tested after riveting to ensure that it will not leak during subsequent use and to prevent the ingress of moisture and air, thus enhancing safety.

[0003] In the helium leak testing of battery cells, one side of the product is vacuumed and connected to a helium detector, while the other side is injected with helium at a certain pressure. The detector checks for leaks to determine if the product meets design requirements. Specifically, different products require tooling and fixtures designed to meet their specific leak testing requirements based on their characteristics.

[0004] Currently, most steel / aluminum shell battery cells are relatively large. When designing helium testing fixtures, the structure is typically: test chamber + sealing ring + inflation chamber + sealing ring. Due to the large size, there is sufficient clearance between the sealing ring and the product component, preventing the sealing ring from blocking the tested area and ensuring it doesn't interfere with the test. However, when the product size is very small—for example, when the distance between the edge of the cover plate and the electrode insulation is less than 0.7mm—the above design cannot be used for helium testing fixtures. A 1mm gap is too small, and the sealing ring itself has a certain size (even a 1mm diameter is difficult to achieve). Furthermore, the sealing ring undergoes elastic deformation during mold closing testing. If the existing testing method is still used, there is no gap between the product and the sealing ring, causing the sealing ring to contact the tested area, posing a risk of blockage and making it impossible to effectively detect any airtightness issues.

[0005] Therefore, it is necessary to provide a helium leak detection fixture that can be applied to the leak detection of products of various sizes, especially small-sized products. Utility Model Content

[0006] The purpose of this invention is to provide a helium leak detection fixture suitable for air tightness testing of products of various sizes, especially for air tightness testing of small-sized products.

[0007] To achieve the above objectives, this utility model provides a helium leak testing fixture for detecting the airtightness of products, comprising: A support base, including a base and a bracket mounted on the base; The lower mold assembly, mounted on the base, includes a lower mold base and a sealing support. The lower mold base has an installation groove, a first cavity, a detection channel, and an inflation channel. The installation groove is connected to the detection channel, and the first cavity is connected to the inflation channel and the installation groove. The sealing support has a detection cavity. The sealing support is mounted on the installation groove and connects the detection cavity to the detection channel. The product to be tested is placed on the sealing support to isolate the detection cavity from the first cavity. The upper mold assembly is slidably mounted on the support. The upper mold assembly is located above the lower mold assembly and is coaxially arranged with the lower mold assembly. The upper mold assembly includes an upper mold base, in which a second cavity is opened. The upper mold base slides close to and fits against the lower mold base, so that the upper mold base and the lower mold base are sealed together, and the first cavity and the second cavity form an inflation cavity that communicates with the inflation channel.

[0008] By adopting the above technical solution, the airtightness helium testing fixture of this utility model is used to test the airtightness of battery cell covers. It is applicable to battery cell covers of various sizes, has a wider testing range, and provides better testing results. The airtightness helium testing fixture includes a support base and a lower mold assembly and an upper mold assembly mounted on the support base. The lower mold assembly includes a lower mold base and a sealing support. The lower mold base has an installation groove, a first cavity, a detection channel, and an inflation channel. The installation groove is connected to the detection channel, and the first cavity is connected to the inflation channel and the installation groove. The sealing support has a detection cavity. The sealing support is installed in the installation groove and connects the detection cavity to the detection channel. The product to be tested is placed on the sealing support to isolate the detection cavity from the first cavity. The upper mold assembly is located above the lower mold assembly and is coaxially arranged with the lower mold assembly to ensure precise fit and better testing. The upper mold assembly includes an upper mold base with a second cavity inside. The upper mold base slides closer to and fits against the lower mold base, creating a sealed connection between the upper and lower mold bases. This allows the first and second cavities to form an inflation chamber connected to an inflation channel. The product being tested isolates the inflation chamber from the testing chamber. Helium is then injected into the inflation chamber. If helium is detected in the testing channel, the product's sealing performance is deemed unqualified; if no helium is detected, the product's sealing performance is deemed qualified. This utility model's helium leak testing fixture allows for testing where the space around the testing area on the product is small, preventing the testing area from being blocked by the sealing ring. It is applicable to products of various sizes, offering a wider testing range and better testing results.

[0009] Preferably, the sealing support can elastically deform within a preset range to allow the product to fit against the sealing support and form a seal between the product and the sealing support.

[0010] Preferably, a fixing member is also provided inside the lower mold base. The fixing member is installed on the lower mold base and one end protrudes into the mounting groove to press and fix the sealing support member.

[0011] Preferably, the end of the fastener facing the sealing support has a fixing groove that mates with the product, and both ends of the sealing support are provided with fasteners. The product is installed on the sealing support and located in the fixing grooves on both sides.

[0012] Preferably, the upper mold assembly further includes a pressing assembly, which includes a mounting block and a pressing block. The pressing block is mounted on the upper mold base by the mounting block and protrudes from the upper mold base. The upper mold base is fitted against the lower mold base so that the pressing block presses the product, thereby making the product fit against the sealing support.

[0013] Preferably, the pressure block is provided with an air guide groove, through which the product is connected to the inflation chamber.

[0014] Preferably, the pressing assembly is located in the second cavity, and the pressing block has a venting groove. The second cavity and the venting groove cooperate with the first cavity to form an inflation cavity for inflation.

[0015] Preferably, a guide assembly is provided between the upper mold base and the lower mold base. The guide assembly includes a guide post and a guide hole. The guide post and the guide hole cooperate to make the upper mold base and the lower mold base fit together in a preset state. The guide post is provided on the upper mold base and / or the lower mold base, and the guide hole is opened in the lower mold base and / or the upper mold base.

[0016] Preferably, a sealing groove is provided on the upper or lower mold base, and a sealing element is installed in the sealing groove to seal the inflation chamber.

[0017] Preferably, the bracket is provided with a sliding component and a driving component. The upper mold base is connected to the output end of the driving component via the sliding component. The driving component actuates to drive the upper mold base to slide along the sliding component closer to or away from the lower mold base. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a structural diagram of a helium airtightness testing fixture provided in an embodiment of the present invention.

[0020] Figure 2 yes Figure 1 Structural diagram of the lower and middle mold components.

[0021] Figure 3 yes Figure 2 Enlarged view of point A in the middle.

[0022] Figure 4 yes Figure 2 A cross-sectional view at an angle.

[0023] Figure 5 yes Figure 2 Structural diagram of the lower and middle mold base.

[0024] Figure 6 yes Figure 2 Structural diagram of the central sealing support component.

[0025] Figure 7 yes Figure 1 Structural diagram of the upper and middle module components.

[0026] Figure 8 yes Figure 7 Enlarged view of point B in the middle.

[0027] Figure 9 yes Figure 7 Structural diagram of the medium-pressure material assembly.

[0028] Explanation of reference numerals in the attached figures: 100. Helium leak test fixture; 101. Support base; 1011. Base; 1012. Bracket; 102. Product; 10. Lower mold assembly; 11. Lower mold base; 110. Mounting groove; 111. First cavity; 112. Detection channel; 113. Inflation channel; 114. Sealing groove; 12. Sealing support; 121. Detection cavity; 122. Through hole; 13. Fixing component; 131. Fixing groove; 14. Sealing component; 20. Upper mold assembly; 21. Upper mold base; 211. Second cavity; 212. Mounting cavity; 213. Groove; 22. Pressing assembly; 221. Pressing block; 2211. Air guide groove; 2212. Vent groove; 2213. Mating groove; 222. Mounting block; 2221. Mounting hole; 2222. Groove; 30. Guide assembly; 31. Guide post; 32. Guide hole; 40. Sliding component; 50. Driving component. Detailed Implementation

[0029] To explain the technical content and structural features of this utility model in detail, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0030] Please see Figure 1This utility model provides a helium airtightness testing fixture 100 for testing the airtightness of a product 102, which can be a battery cell cover. After the positive and negative terminals of the battery cell cover are riveted together, when the distance between the edge of the cover and the insulating adhesive of the terminal is small, it is difficult to test it using existing testing devices. The helium airtightness testing fixture 100 of this utility model includes a support base 101 and a lower mold assembly 10 and an upper mold assembly 20 disposed on the support base 101. The support base 101 includes a base 1011 and a bracket 1012 disposed on the base 1011. The lower mold assembly 10 is disposed on the base 1011 and includes a lower mold seat 11 and a sealing support member 12. The lower mold seat 11 has an installation groove 110, a first cavity 111, a testing channel 112, and an inflation channel 113. The mounting groove 110 is connected to the detection channel 112, and the first cavity 111 is connected to the inflation channel 113, and the first cavity 111 can also be connected to the mounting groove 110. A detection cavity 121 is provided inside the sealing support 12. The sealing support 12 is installed in the mounting groove 110 and the detection cavity 121 is connected to the detection channel 112 through the through hole 122. The product 102 to be tested is placed on the sealing support 12 to isolate the detection cavity 121 and the first cavity 111, thereby determining whether the sealing performance of the product 102 meets the requirements. The sealing support 12 can be used to place and support the product 102 and provides a sealing function. On the other hand, the upper mold assembly 20 is slidably disposed on the bracket 1012. The upper mold assembly 20 is located above the lower mold assembly 10 and coaxially disposed with the lower mold assembly 10, that is, the upper mold assembly 20 is located directly above the lower mold assembly 10. The upper mold assembly 20 includes an upper mold base 21, within which a second cavity 211 is formed. The upper mold base 21 slides close to and fits against the lower mold base 11, thereby sealing the upper mold base 21 and the lower mold base 11. The first cavity 111 and the second cavity 211 form an inflation chamber communicating with the inflation channel 113. The inflation chamber is used to fill with helium, and the detection channel 112 is used to detect whether helium leaks through the product 102 from the detection chamber 121, thereby determining whether the airtightness of the product 102 is qualified.

[0031] After adopting the above technical solution, the airtightness helium testing fixture 100 of this utility model can be applied to the testing of battery cell covers of various sizes, with a wider testing range and better testing results. The airtightness helium testing fixture 100 includes a support base 101 and a lower mold assembly 10 and an upper mold assembly 20 disposed on the support base 101. The lower mold assembly 10 includes a lower mold base 11 and a sealing support member 12. The lower mold base 11 has an installation groove 110, a first cavity 111, a detection channel 112 and an inflation channel 113. The installation groove 110 is connected to the detection channel 112, the first cavity 111 is connected to the inflation channel 113, and the first cavity 111 is connected to the installation groove 110. A detection cavity 121 is formed within the sealing support 12. The sealing support 12 is installed in the mounting groove 110, and the detection cavity 121 is connected to the detection channel 112. The product 102 to be tested is placed on the sealing support 12 to isolate the detection cavity 121 from the first cavity 111. The upper mold assembly 20 is located above the lower mold assembly 10 and is coaxially arranged with the lower mold assembly 10 to ensure precise fit and better testing. The upper mold assembly 20 includes an upper mold base 21, in which a second cavity 211 is formed. The upper mold base 21 slides close to and fits against the lower mold base 11, so that the upper mold base 21 and the lower mold base 11 are sealed together, and the first cavity 111 and the second cavity 211 form an inflation cavity connected to the inflation channel 113. By isolating the inflation chamber and the detection chamber 121 of the product under test 102, helium is filled into the inflation chamber. If helium is detected in the detection channel 112, it proves that the product under test 102 is not airtight; if no helium is detected in the detection channel 112, it proves that the product under test 102 is airtight. The airtightness helium testing fixture 100 of this utility model can prevent the tested area from being blocked by the sealing ring when the space around the detection area on the product 102 is small. It can be applied to products 102 of various sizes, with a wider testing range and better testing results.

[0032] Please see Figures 1 to 6 In some optional embodiments, the sealing support 12 can elastically deform within a preset range. The sealing support 12 is made of rubber material with relatively high hardness and relatively small deformation, but it can form a good sealing effect when in contact with the flat product 102. That is, under the pressure of the pressure block 221 in the upper mold assembly 20, the product 102 can be made to fit against the sealing support 12 and be sealed between them, forming a good sealing test environment.

[0033] Please see Figures 1 to 5In some optional embodiments, a fixing member 13 is also provided in the lower mold base 11. The fixing member 13 is installed on the lower mold base 11 and one end protrudes into the mounting groove 110 to press and fix the sealing support member 12. The fixing member 13 allows the sealing support member 12 to be better installed in the mounting groove 110, and makes one side of the sealing support member 12 seal against the mounting groove 110 to isolate the detection channel 112 and the inflation chamber. The fixing member 13 has a fixing groove 131 that mates with the product 102 at one end facing the sealing support member 12. The sealing support member 12 is provided with fixing members 13 at both ends to fix the sealing support member 12 from both ends, making the overall structure more stable. The product 102 is installed on the sealing support member 12 and located in the fixing grooves 131 on both sides. The product 102 can be slidably placed on the sealing support member 12 along the fixing grooves 131 on both sides.

[0034] Please see Figures 7 to 9In some optional embodiments, the upper mold assembly 20 further includes a pressing assembly 22, which includes a mounting block 222 and a pressing block 221. The mounting block 222 and the pressing block 221 can be integrally formed. The pressing block 221 is mounted on the upper mold base 21 via the mounting block 222, and the pressing block 221 protrudes from the upper mold base 21. The mounting block 222 has mounting holes 2221 for fixing the mounting block 222. When the upper mold base 21 slides down to fit against the lower mold base 11, the pressing block 221 presses against the product 102, causing the product 102 to fit against the sealing support member 12, resulting in a better overall sealing effect. The pressing assembly 22 is located within the second cavity 211. The second cavity 211 is an inwardly recessed cavity within the lower mold base 11, and a mounting cavity 212 for mounting the pressing assembly 22 is also provided within the second cavity 211. The pressing assembly 22 is installed in the mounting cavity 212, causing the pressing block 221 to protrude from the upper mold base 21. Specifically, a groove 213 communicating with the mounting cavity 212 is also provided within the second cavity 211, and a venting groove 2212 is provided within the pressing block 221. The second cavity 211, the groove 213, and the venting groove 2212 cooperate with the first cavity 111 to form an inflation cavity for inflation. The venting groove 2212 penetrates the pressing block 221 and is connected to the groove 213. On the other hand, a mating groove 2213 is provided on the pressing block 221 to mate with the electrode post of the battery cell cover plate. The electrode post protrudes from the cover plate, and the mating groove 2213 is inwardly recessed to better mate with the electrode post, thereby enabling better airtightness testing. A venting groove 2211 is also provided around the periphery of the mating groove 2213, through which the product 102 is connected to the inflation chamber. Furthermore, a recessed groove 2222 is provided on the surface of the mounting block 222 away from the pressure block 221, corresponding to the ventilation groove 2212. With the groove 2222 provided, the ventilation groove 2212 can better connect to the groove body 213. It is understandable that the venting groove 2211 is provided to prevent the entire pressure block 221 from blocking the electrode portion of the product 102 to be tested. The venting grooves 2211 and 2212 allow inflation from all sides of the part of the product 102 to be tested, thereby enabling better airtightness testing of the tested part and resulting in better testing results.

[0035] Please see Figure 2 and Figure 7In some optional embodiments, a guide assembly 30 is provided between the upper mold base 21 and the lower mold base 11. The guide assembly 30 includes a guide post 31 and a guide hole 32. The guide post 31 and the guide hole 32 cooperate to make the upper mold base 21 and the lower mold base 11 fit together in a preset state. The guide post 31 can be provided on the upper mold base 21, or on the lower mold base 11, or both the upper mold base 21 and the lower mold base 11 may have guide posts 31. Correspondingly, the guide hole 32 cooperating with the guide post 31 can be formed in the lower mold base 11, or in the upper mold base 21, or both the upper mold base 21 and the lower mold base 11 may have guide holes 32. The key is that the guide post 31 and the guide hole 32 cooperate to ensure a good fit between the upper mold base 21 and the lower mold base 11.

[0036] Please see Figure 2 In some optional embodiments, a sealing groove 114 is provided on the upper mold base 21 or the lower mold base 11, and a sealing element 14 is installed in the sealing groove 114 to seal the inflation chamber. In this embodiment, the sealing groove 114 is provided on the lower mold base 11, and the sealing element 14 is installed in the sealing groove 114. When the upper mold base 21 slides down and fits against the lower mold base 11, the sealing element 14 seals the inflation chamber between the upper mold base 21 and the lower mold base 11.

[0037] Please see Figure 1 In some optional embodiments, the bracket 1012 is provided with a sliding component 40 and a driving component 50. The upper mold base 21 is connected to the output end of the driving component 50 via the sliding component 40. The driving component 50 actuates to drive the upper mold base 21 to slide along the sliding component 40 closer to or away from the lower mold base 11. The driving component 50 can be manually driven or automatically driven. For example, the driving component 50 can be a quick clamp, or the driving component 50 can be a motor, etc.

[0038] like Figures 1 to 9As shown, the airtightness helium testing fixture 100 of this utility model is applicable to the testing of battery cell covers of various sizes, with a wider testing range and better testing results. The airtightness helium testing fixture 100 includes a support base 101 and a lower mold assembly 10 and an upper mold assembly 20 disposed on the support base 101. The lower mold assembly 10 includes a lower mold base 11 and a sealing support member 12. The lower mold base 11 has an installation groove 110, a first cavity 111, a detection channel 112 and an inflation channel 113. The installation groove 110 is connected to the detection channel 112, the first cavity 111 is connected to the inflation channel 113, and the first cavity 111 is connected to the installation groove 110. A detection cavity 121 is formed within the sealing support 12. The sealing support 12 is installed in the mounting groove 110, and the detection cavity 121 is connected to the detection channel 112. The product 102 to be tested is placed on the sealing support 12 to isolate the detection cavity 121 from the first cavity 111. The upper mold assembly 20 is located above the lower mold assembly 10 and is coaxially arranged with the lower mold assembly 10 to ensure precise fit and better testing. The upper mold assembly 20 includes an upper mold base 21, which has a second cavity 211. The upper mold base 21 slides close to and fits against the lower mold base 11. A pressure block 221 presses against the product 102, and the upper mold base 21 and the lower mold base 11 are sealed together. The first cavity 111 and the second cavity 211 form an inflation cavity connected to the inflation channel 113. An air guide groove 2211 and a ventilation groove 2212 connected to the inflation cavity are formed on the pressure block 221 to improve the testing effect of the product 102. The product 102 is isolated from the inflation cavity and the testing cavity 121. Helium is filled into the inflation cavity. If helium is detected in the testing channel 112, it proves that the product 102's sealing performance is unqualified; if no helium is detected in the testing channel 112, it proves that the product 102's sealing performance is qualified. This utility model's airtightness helium testing fixture 100, when the space around the testing area on the product 102 is small, will not be blocked by the sealing ring. It is applicable to products 102 of various sizes, has a wider testing range, and provides better testing results.

[0039] The above-disclosed examples are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the claims of the present utility model shall fall within the scope of the present utility model.

Claims

1. A helium leak testing fixture for detecting the air tightness of a product, characterized in that, include: The support includes a base and a bracket disposed on the base; A lower mold assembly, disposed on the base, includes a lower mold base and a sealing support. The lower mold base has an installation groove, a first cavity, a detection channel, and an inflation channel. The installation groove is connected to the detection channel, and the first cavity is connected to the inflation channel and the installation groove. The sealing support has a detection cavity. The sealing support is installed in the installation groove and the detection cavity is connected to the detection channel. The product to be tested is placed on the sealing support to isolate the detection cavity from the first cavity. The upper mold assembly is slidably disposed on the bracket. The upper mold assembly is located above the lower mold assembly and is coaxially disposed with the lower mold assembly. The upper mold assembly includes an upper mold base, in which a second cavity is formed. The upper mold base slides close to and fits against the lower mold base, so that the upper mold base and the lower mold base are sealed together, and the first cavity and the second cavity form an inflation cavity communicating with the inflation channel.

2. The gas tightness helium testing fixture according to claim 1, characterized in that, The sealing support can elastically deform within a preset range so that the product fits into the sealing support and is sealed between the product and the sealing support.

3. The gas tightness helium testing fixture according to claim 1, characterized in that, The lower mold base is also provided with a fixing member, which is installed on the lower mold base and one end protrudes into the mounting groove to press and fix the sealing support member.

4. The gas tightness helium testing fixture according to claim 3, characterized in that, The fixing member has a fixing groove at one end facing the sealing support member that mates with the product. The fixing member is provided at both ends of the sealing support member. The product is installed on the sealing support member and located in the fixing grooves on both sides.

5. The gas tightness helium testing fixture according to claim 1, characterized in that, The upper mold assembly further includes a pressing assembly, which includes a mounting block and a pressing block. The pressing block is mounted on the upper mold base by the mounting block and protrudes from the upper mold base. The upper mold base is fitted to the lower mold base so that the pressing block presses the product, thereby making the product fit against the sealing support.

6. The gas tightness helium testing fixture according to claim 5, characterized in that, The pressure block has an air guide groove, which allows the product to be connected to the inflation chamber.

7. The gas tightness helium testing fixture according to claim 5, characterized in that, The pressing assembly is located in the second cavity, and the pressing block has a venting groove. The second cavity and the venting groove cooperate with the first cavity to form the inflation cavity for inflation.

8. The gas tightness helium testing fixture according to claim 1, characterized in that, A guide assembly is provided between the upper mold base and the lower mold base. The guide assembly includes a guide post and a guide hole. The guide post cooperates with the guide hole to make the upper mold base and the lower mold base fit together in a preset state. The guide post is disposed on the upper mold base and / or the lower mold base, and the guide hole is opened in the lower mold base and / or the upper mold base.

9. The gas tightness helium testing fixture according to claim 1, characterized in that, A sealing groove is provided on the upper mold base or the lower mold base, and a sealing element is installed in the sealing groove to seal the inflation chamber.

10. The gas tightness helium testing fixture according to claim 1, characterized in that, The bracket is provided with a sliding component and a driving component. The upper mold base is connected to the output end of the driving component via the sliding component. The driving component is activated to drive the upper mold base to slide along the sliding component closer to or away from the lower mold base.

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