A battery cover plate helium detection device
The battery cover helium testing device uses helium to test the airtightness between the explosion-proof film and the cover, which solves the leakage problem caused by welding gaps, realizes fast and convenient battery cover quality testing, and improves battery safety and testing efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SUZHOU CHUANGNENG NEW ENERGY IND
- Filing Date
- 2025-10-28
- Publication Date
- 2026-07-31
AI Technical Summary
In the existing technology, there is a gap at the weld between the battery cover and the explosion-proof film, which leads to electrolyte leakage, affecting the safety of battery use, and making detection inconvenient.
A helium detection device for battery cover plates was designed. It uses helium to detect the airtightness between the explosion-proof film and the cover plate, and uses a helium sensor to detect whether helium passes through the gap to judge the welding quality.
It enables rapid and convenient testing of battery cover airtightness, ensuring a firm weld between the explosion-proof film and the cover, thus improving battery safety and testing efficiency.
Smart Images
Figure CN224581079U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of battery technology, and in particular to a helium detection device for battery cover plates. Background Technology
[0002] The battery cover is an important component connecting the positive and negative terminals of the battery. For example... Figure 1 As shown, the circular cover has a central hole for mounting the terminal post. A pressure relief valve, composed of an explosion-proof diaphragm, is typically installed on the cover. When the pressure inside the battery increases and exceeds the pressure resistance of the explosion-proof diaphragm, the diaphragm ruptures, thus releasing pressure and preventing the battery from exploding due to excessive internal pressure, thereby improving battery safety.
[0003] The explosion-proof membrane is welded to the countersunk hole on the cover plate where the pressure relief valve is located. Welding inherently introduces defects, resulting in a certain defect rate. If a gap exists at the weld between the explosion-proof membrane and the cover plate, electrolyte will leak out, affecting battery performance. Therefore, quality inspection of the weld between the cover plate and the explosion-proof membrane is necessary. Utility Model Content
[0004] The purpose of this invention is to solve the above-mentioned problems by designing a helium detection device for battery cover plates, which solves the problem of inconvenient detection during the quality inspection of battery cover plates.
[0005] The technical solution of this utility model to achieve the above objectives is a battery cover helium detection device, wherein the battery cover has a pressure relief port, and an explosion-proof membrane is welded inside the pressure relief port. The device includes: The upper template has at least one helium gas hole for introducing helium gas into the cavity between the upper and lower templates; The lower template has at least one positioning groove on its upper surface for positioning the battery cover. Two sealing rings are placed in the positioning groove. The lower template has a first gas channel inside. The first gas channel extends from the annular area formed by the two sealing rings in the positioning groove to the side or bottom of the lower template. The annular area formed by the two sealing rings corresponds to the position of the explosion-proof film. A helium sensor, wherein the helium sensor is sealed at the outlet of the first gas channel; The lifting mechanism is used to control the upper template to move closer to or further away from the lower template.
[0006] Preferably, the bottom surface of the upper template has at least one groove, the diameter of which is smaller than the outer diameter of the battery cover, and a sealing protrusion is provided in the groove. The helium gas hole is located in the annular area enclosed between the sealing protrusion and the inner wall of the groove.
[0007] Preferably, the upper template has a second gas channel inside, which extends from the side or bottom of the upper template into the helium gas hole.
[0008] Preferably, the positioning groove is provided with two sealing grooves, the air inlet of the first gas channel is located in the annular area formed by the two sealing grooves, and the two sealing rings are respectively placed in the two sealing grooves.
[0009] Preferably, the upper surface of the lower template has clearance grooves on both sides of the positioning groove, and the clearance grooves are connected to the positioning groove through notches.
[0010] Preferably, the lower template is provided with a guide rod, which is slidably connected to the upper template.
[0011] Preferably, the bottom of the lower template has an extraction hole that communicates with the first gas channel.
[0012] Preferably, the bottom of the lower template is connected to an air extraction pipe, the bottom surface of the lower template has an installation groove, the air extraction hole is located in the installation groove, the upper end of the air extraction pipe is embedded in the installation groove and fixedly connected to the lower template by screws, and the air extraction pipe is connected to the air extraction hole.
[0013] Preferably, the device further includes a base plate and a support frame disposed on the base plate, wherein the lifting mechanism is disposed on the support frame and connected to the upper template.
[0014] Preferably, the lifting mechanism is a cylinder, which is vertically fixed on the support frame. The output end of the cylinder is connected to a fixing block, and the fixing block is connected to the upper template through a pressure block.
[0015] Its advantages over existing technologies are: The battery cover helium testing device provided by this utility model has the advantages of simple structure, convenient operation and high testing efficiency. This fixture needs to be used in conjunction with other auxiliary mechanisms to quickly complete the airtightness test of the explosion-proof film on the battery cover.
[0016] After the battery cover is placed in the positioning groove on the lower template, the upper and lower templates are opened and closed by the lifting mechanism. The two sealing rings form an annular sealing area at the bottom of the lower template. The air inlet of the first gas channel is located in this sealing area. The gas in the first gas channel is extracted by the external vacuum mechanism to create a negative pressure. Then, helium is injected into the mold through the helium hole on the upper template. The helium will enter the space above the battery cover. If there is a gap between the explosion-proof film and the cover, the helium will quickly enter the first gas channel through the gap. After the helium sensor detects the helium, it indicates that the explosion-proof film is indeed not firmly welded to the battery cover. This allows for rapid quality inspection of the battery cover and is suitable for batch product testing. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the helium detection device for the battery cover. Figure 2 This is a schematic diagram of the upper and lower molds in the battery cover helium detector. Figure 3 This is a schematic diagram of the bottom structure of the upper mold; Figure 4 This is a cross-sectional structural diagram of the upper mold; Figure 5 This is a schematic diagram of the structure when a sealing ring is placed in one of the positioning grooves on the lower mold. Figure 6 This is a schematic diagram of the bottom structure of the lower mold; Figure 7 This is a cross-sectional structural diagram of the lower mold; Figure 8 This is a schematic diagram of the structure when a battery cover is placed in one of the positioning slots on the lower mold. Figure 9 This is a schematic diagram showing a square sealing ring placed inside a square sealing groove.
[0018] In the diagram, 1. Upper template; 101. Second gas channel; 1011. Helium gas port; 102. Groove; 103. Sealing protrusion; 2. Lower template; 201. Positioning groove; 202. First gas channel; 203. First sealing groove; 204. Second sealing groove; 205. Clearance groove; 206. Mounting groove; 207. Ejection port; 208. Square sealing groove; 3. Cylinder; 4. Base plate; 5. Support frame; 6. Fixing block; 7. Pressure block; 8. Bracket; 9. Ejection pipe; 10. Guide rod; 11. First sealing ring; 12. Second sealing ring; 13. Battery cover; 14. Explosion-proof membrane; 15. Square sealing ring. Detailed Implementation
[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.
[0020] A preferred embodiment of this utility model provides a battery cover helium detection device. This device works in conjunction with a helium filling mechanism and a vacuuming mechanism to detect the airtightness, thereby determining the welding quality of the explosion-proof film 14 and whether there is a gap between the battery cover 13 and the explosion-proof film 14.
[0021] See Figure 1 The battery cover 13 is circular in shape and has a pressure relief port. A countersunk hole is provided inside the pressure relief port, and an explosion-proof membrane 14 is welded into the countersunk hole. The explosion-proof membrane 14 and the pressure relief port constitute a pressure relief valve. When the internal pressure of the battery rises and exceeds the maximum pressure that the explosion-proof membrane 14 can withstand, the explosion-proof membrane 14 will rupture and release pressure, preventing the battery from exploding due to excessive internal pressure.
[0022] Specifically, such as Figure 2 As shown, the device mainly includes components such as a base plate 4, a support frame 5, a cylinder 3, an upper template 1, a lower template 2, an extraction pipe 9, and a helium sensor (not shown in the figure).
[0023] The base plate 4 is a flat plate. The support frame 5 serves as the component for mounting and fixing the cylinder 3, and it is fixedly mounted on the base plate 4 with bolts. The cylinder 3 is vertically fixedly mounted on the support frame 5.
[0024] Cylinder 3, as a pneumatic control component, is used to control the up and down movement of the upper template 1 to realize the opening and closing of the upper template 1 and the lower template 2.
[0025] The output end of cylinder 3 faces downwards and is connected to the fixing block 6. The lower surface of the fixing block 6 is in close contact with the upper surface of the upper template 1. Two pressure blocks 7, which are inverted U-shaped, are provided on the upper surface of the upper template 1. The two pressure blocks 7 are located at both ends of the fixing block 6 and are used to press and limit the fixing block 6 onto the upper template 1. The two ends of the pressure blocks 7 are fixedly connected to the upper template 1 by screws. A bracket 8 is provided on the base plate 4, and the lower template 2 is fixed on the bracket 8.
[0026] like Figure 3 As shown, the lower template 2 is located directly below the upper template 1. A guide rod 10 is provided on the lower template 2, and a corresponding guide hole is provided on the upper template 1. The guide rod 10 can slide up and down in the guide hole to guide the up and down movement of the upper template 1, so as to ensure that the upper template 1 and the lower template 2 can fit together completely and accurately.
[0027] like Figure 4As shown, there are two circular grooves 102 on the bottom surface of the upper mold 1. The diameter of the grooves 102 is adapted to the outer diameter of the battery cover plate 13. When the upper and lower molds are closed, the battery cover plate 13 located on the lower mold 2 is in close contact with the bottom surface of the lower mold 2 and cooperates with the grooves 102 to form a cavity.
[0028] Each groove 102 has a sealing protrusion 103, which is annular and has an inner diameter not less than the inner diameter of the central hole in the battery cover 13. The outer diameter of the groove 102 is smaller than the outer diameter of the battery cover 13. In this way, when the upper template 1 is pressed against the battery cover 13, an annular cavity is formed above the battery cover 13 between the inner wall of the groove 102 and the sealing protrusion 103, which allows the helium gas port 1011 to be connected to the explosion-proof membrane 14.
[0029] See Figure 5 An air passage, namely the second gas channel 101, is formed inside the upper template 1. Correspondingly, each groove 102 on the lower surface of the upper template 1 has a helium gas hole 1011, and the outlet end of the second gas channel 101 is connected to two helium gas holes 1011 respectively. The inlet end of the second gas channel 101 extends to the side of the upper template 1 for connection with an external helium gas source. After helium enters the second gas channel 101, it will exit from the helium gas hole 1011 and enter the annular cavity formed between the battery cover plate 13 and the groove 102 on the bottom surface of the upper template 1.
[0030] like Figure 6 As shown, two positioning grooves 201 are formed on the upper surface of the lower template 2, which are used to position the two battery cover plates 13 respectively. Within each positioning groove 201, two sealing grooves of different diameters are formed, namely a first sealing groove 203 and a second sealing groove 204. The diameter of the first sealing groove 203 is larger than the diameter of the second sealing groove 204.
[0031] The two sealing grooves will enclose an annular area within the positioning groove 201, which is located directly below the explosion-proof film 14 on the battery cover 13. In other words, when the battery cover 13 is placed in the positioning groove 201, the explosion-proof film 14 is exactly within this annular area.
[0032] A first sealing ring 11 and a second sealing ring 12 are respectively placed in the first sealing groove 203 and the second sealing groove 204. When the battery cover 13 is placed in the positioning groove 201, the lower surface of the battery cover 13 will be in close contact with the first sealing ring 11 and the second sealing ring 12. The first sealing ring 11 and the second sealing ring 12 will isolate the inner and outer circumferences of the battery cover 13, forming an annular sealing gap under the battery cover 13.
[0033] On the upper surface of the lower template 2, on both sides of the two positioning grooves 201, there is a clearance groove 205. The clearance groove 205 is connected to the positioning groove 201 through a notch. When the battery cover 13 is placed in the positioning groove 201, part of the battery cover 13 extends into the clearance groove 205 so that the inspection personnel can manually remove the battery cover 13.
[0034] See also Figure 6 A square sealing groove 208 is also provided on the upper surface of the lower template 2. The square sealing groove 208 is located around the two clearance grooves 205 and the two positioning grooves 201.
[0035] like Figure 9 As shown, a square sealing ring 15 is placed in the square sealing groove 208. When the upper mold plate 1 and the lower mold plate 2 are closed, the square sealing ring 15 will be in close contact with the bottom surface of the upper mold plate 1 to enhance the sealing performance and prevent helium from escaping.
[0036] like Figure 8 As shown, a gas channel, namely a first gas channel 202, is also formed inside the lower template 2. This first gas channel 202 extends from a certain position within the annular region between the first sealing groove 203 and the second sealing groove 204 in the positioning groove 201 to the side of the lower template 2. That is, the inlet end of the first gas channel 202 is located within the annular region between the first sealing groove 203 and the second sealing groove 204 in the positioning groove 201, while the other end is located on the side of the lower template 2, and this end is not the outlet end. A helium sensor is installed at this end, and the helium sensor is sealed to this end. The helium sensor detects the presence or absence of helium in the first gas channel 202.
[0037] Each of the two positioning slots 201 has an air inlet, which is connected to the air inlet end of the first gas channel 202.
[0038] See Figure 7 A mounting groove 206 is provided in the middle area of the lower surface of the lower template 2. An air extraction hole 207 is provided in the mounting groove 206, which is connected to the first gas channel 202. The air extraction hole 207 is the air outlet of the first gas channel 202.
[0039] The upper end of the extraction pipe 9 is embedded into the mounting groove 206 and fixed with bolts. The extraction pipe 9 is connected to the extraction port 207 (see...). Figure 2 The other end of the extraction pipe 9 is connected to a vacuum mechanism, which is used to extract the gas in the first gas channel 202 to the outside, so that a negative pressure is generated in the first gas channel 202.
[0040] After the battery cover 13 is placed in the positioning groove 201 on the lower template 2, the cylinder 3 controls the upper template 1 to move downwards, and the upper template 1 and lower template 2 close together. At this time, the vacuum mechanism extracts the gas from the first gas channel 202 in the lower template 2, creating a negative pressure. Then, helium gas is introduced into the second gas channel 101 in the upper template 1. The helium gas enters the area above the battery cover 13, and the entire annular area above the battery cover 13 is under pressure, simulating the pressure situation when the cover is installed on the battery. If there is a gap between the explosion-proof film 14 and the cover, and they are not properly welded, and the first gas channel 202 is under negative pressure, helium gas will quickly enter the first gas channel 202 through the gap. When the helium gas sensor detects the helium gas, it indicates that the explosion-proof film 14 is indeed not firmly welded to the battery cover 13. Otherwise, the quality of the battery cover 13 is qualified.
[0041] After the inspection is completed, the mold is opened, and the battery cover 13 is removed, the residual helium in the first gas channel 202 is extracted by the vacuuming mechanism to prevent the helium sensor from misjudging when inspecting the next batch of battery cover 13.
[0042] The above technical solution only embodies the preferred technical solution of this utility model. Any changes that may be made by those skilled in the art to certain parts of it embody the principle of this utility model and fall within the protection scope of this utility model.
Claims
1. A battery cover plate helium detection device, the battery cover plate (13) having a pressure relief port, a rupture disc (14) being welded in the pressure relief port, characterized in that, The device includes: The upper template (1) has at least one helium gas hole (1011) for introducing helium gas into the cavity between the upper template (1) and the lower template (2); The lower template (2) has at least one positioning groove (201) on its upper surface for positioning the battery cover (13). Two sealing rings are placed in the positioning groove (201). The lower template (2) has a first gas channel (202) inside. The first gas channel (202) extends from the annular area formed between the two sealing rings in the positioning groove (201) to the side or bottom of the lower template (2). The annular area formed between the two sealing rings corresponds to the position of the explosion-proof film (14). A helium sensor, wherein the helium sensor is sealed at the outlet of the first gas channel (202); The lifting mechanism is used to control the upper template (1) to move closer to or further away from the lower template (2).
2. The battery lid helium detection apparatus of claim 1, wherein, The bottom surface of the upper template (1) has at least one groove (102), the diameter of the groove (102) is smaller than the outer diameter of the battery cover (13), a sealing protrusion (103) is provided in the groove (102), and the helium gas hole (1011) is located in the annular area enclosed between the sealing protrusion (103) and the inner wall of the groove (102).
3. The battery lid helium detection apparatus of claim 1, wherein, The upper template (1) has a second gas channel (101) inside, which extends from the side or bottom of the upper template (1) into the helium hole (1011).
4. The battery lid helium detection apparatus of claim 1, wherein, The positioning groove (201) is provided with two sealing grooves. The air inlet of the first gas channel (202) is located in the annular area formed by the two sealing grooves. The two sealing rings are placed in the two sealing grooves respectively.
5. The battery cover helium detection device according to claim 1, characterized in that, The upper surface of the lower template (2) is provided with clearance grooves (205) on both sides of the positioning groove (201), and the clearance grooves (205) and the positioning groove (201) are connected by a notch.
6. The battery lid helium detection apparatus of claim 1, wherein, The lower template (2) is provided with a guide rod (10), which is slidably connected to the upper template (1).
7. The battery lid helium detection apparatus of claim 1, wherein, The bottom of the lower template (2) has an air extraction hole (207) that communicates with the first gas channel (202).
8. The battery lid helium detection apparatus of claim 7, wherein, The bottom of the lower template (2) is connected to an air extraction pipe (9). The bottom surface of the lower template (2) has an installation groove (206). The air extraction hole (207) is located in the installation groove (206). The upper end of the air extraction pipe (9) is embedded in the installation groove (206) and fixedly connected to the lower template (2) by screws. The air extraction pipe (9) is connected to the air extraction hole (207).
9. The battery lid helium detection apparatus of claim 1, wherein, The device also includes a base plate (4) and a support frame (5) on the base plate (4), and the lifting mechanism is mounted on the support frame (5) and connected to the upper template (1).
10. The battery lid helium detection apparatus of claim 9, wherein, The lifting mechanism uses a cylinder (3), which is vertically fixed on the support frame (5). The output end of the cylinder (3) is connected to a fixing block (6), which is connected to the upper template (1) through a pressure block (7).