Polymer battery leak detection device

Abstract

The application belongs to the technical field of lithium ion batteries, and particularly relates to a polymer battery sealing detection device, which comprises a frame cover, an upper cavity mechanism and a lower cavity mechanism; the upper cavity mechanism is arranged on the frame cover, and the lower cavity mechanism is arranged on the frame cover and located below the upper cavity mechanism; the upper cavity mechanism comprises an upper cavity, a first driving assembly for driving the upper cavity to lift, a wedge-shaped block locking assembly and a secondary pressure locking assembly; and the lower cavity mechanism comprises a lower cavity and a second driving assembly for driving the lower cavity to move horizontally. The application can provide great vertical pre-tightening force, effectively eliminate mechanical fitting gaps, prevent the cavity from rebounding and leaking when being inflated at high pressure, ensure the absolute reliability of the sealing environment, and thus significantly improve the detection accuracy and eliminate misjudgment.

Description

Technical Field

[0001] This invention belongs to the field of lithium-ion battery technology, and specifically relates to a polymer battery sealing test device. Background Technology

[0002] Lithium-ion batteries are widely used in consumer electronics and electric vehicles due to their high energy density and long cycle life. In the production of polymer pouch batteries, the cell's sealing is one of the key indicators affecting battery safety. Some cells may have minor damage or pinholes at the packaging edge due to process variations, requiring sealing tests before shipment to remove defective products.

[0003] Currently, the industry mainly uses two methods: manual visual inspection and automated airtightness inspection. Manual inspection is inefficient and difficult to identify minute defects; while existing automated equipment mostly uses single-cylinder pressing or multi-link locking structures, which are prone to leakage of the cavity due to insufficient locking force or gaps in the mechanism during high-pressure inflation. At the same time, it also has problems such as complex structure, high maintenance cost, and cumbersome changeover operation, making it difficult to balance inspection accuracy and production efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide a polymer battery sealing performance testing device to solve the technical problems existing in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a polymer battery sealing performance testing device, comprising a frame outer cover, an upper cavity mechanism, and a lower cavity mechanism; The upper cavity mechanism is disposed on the outer cover of the frame, and the lower cavity mechanism is disposed on the outer cover of the frame and located below the upper cavity mechanism; The upper cavity mechanism includes an upper cavity, a first drive assembly for driving the upper cavity to rise and fall, a wedge block locking assembly, and a secondary pressure locking assembly; The lower cavity mechanism includes a lower cavity and a second drive assembly for driving the lower cavity to move horizontally. The wedge-shaped locking assembly is used to lock the upper cavity and the lower cavity after they are closed by inserting a wedge into the guide structure between them. The secondary clamping assembly is used to apply a secondary clamping force in the vertical direction to the upper cavity after the wedge block locking assembly has been locked.

[0006] Preferably, the wedge block locking assembly includes a standard single-rod double-acting cylinder, a wedge block mounting plate, and a wedge block; The cylinder body of the standard single-rod double-acting cylinder is mounted on the cylinder mounting plate of the frame cover via a cylinder mounting seat. The wedge-shaped mounting plate is connected to the L-shaped connecting seat via a floating joint C, and the L-shaped connecting seat is connected to the piston rod of the standard single-rod double-acting cylinder. The wedge block is fixedly mounted on the wedge block mounting plate; An upper guide block is provided on the upper cavity, and a lower guide block is provided on the lower cavity; The wedge-shaped block is configured to correspond to the mating areas of the upper guide block and the lower guide block.

[0007] Preferably, the wedge-shaped block mounting plate is mounted on the cylinder mounting plate in the X direction via a linear guide rail, and the X-direction of the linear guide rail is parallel to the extension and retraction direction of the standard single-rod double-acting cylinder.

[0008] Preferably, the secondary pressure-locking assembly includes a thin cylinder and a polyurethane pressure block; The cylinder body of the thin cylinder is mounted on the cylinder mounting plate of the frame cover; The polyurethane pressure block is connected to the piston rod of the thin cylinder via a floating joint A; The polyurethane pressure block is correspondingly provided with the connecting plate of the upper cavity or the upper cavity body.

[0009] Preferably, the first drive assembly includes a thin cylinder and a linear guide rail in the Y direction; The linear guide rail is vertically mounted on the upright plate of the frame cover in the Y direction, and the upper cavity is connected to the slider of the linear guide rail in the Y direction. The cylinder body of the thin cylinder is mounted on the cylinder mounting plate of the frame cover. The piston rod of the thin cylinder is connected to the connecting block through the floating joint B. The connecting block is fixedly connected to the connecting plate, and the connecting plate is fixedly connected to the upper cavity.

[0010] Preferably, in the lower cavity mechanism, the lower cavity is detachably connected to the lower cavity connecting plate via a standardized installation interface, and the lower cavity connecting plate is connected to the power output end of the second drive component.

[0011] Preferably, the second drive component is a cylinder, and the cylinder body is fixed to the bottom plate of the frame cover; The lower cavity mechanism also includes a linear guide rail, which is horizontally disposed on the base plate; The lower cavity connecting plate is connected to the piston rod of the cylinder via a connecting plate, and the lower cavity connecting plate is connected to the slider of the linear guide rail.

[0012] Preferably, after the upper cavity and the lower cavity are closed, corresponding slots for alignment observation are opened on their sides.

[0013] Preferably, there are two lower cavities arranged side by side on the lower cavity connecting plate; there are two upper cavities, each corresponding to one of the lower cavities.

[0014] Preferably, it further includes a control system, which is electrically connected to the second drive assembly, the first drive assembly, the wedge block locking assembly, the secondary pressure locking assembly, and the inflation device, and is used to control the complete action process of the lower cavity moving into place, the upper cavity descending and closing, the wedge block locking assembly locking, the secondary pressure locking assembly locking, and inflation detection into the closed cavity.

[0015] The beneficial effects of this invention are as follows: This invention employs a dual-safety structure of wedge-shaped block inclined surface locking and polyurethane pressure block secondary locking. Compared to the traditional single-cylinder pressing method, it can provide a significant vertical pre-tightening force and effectively eliminate mechanical clearance, preventing cavity rebound and leakage during high-pressure inflation, ensuring an absolutely reliable sealing environment, thereby significantly improving detection accuracy and eliminating misjudgments. Simultaneously, through the unique "universal upper cavity + modular lower cavity" design, only the lower cavity needs to be replaced to adapt to all models of polymer batteries. Standardized installation interfaces and fixed external dimensions eliminate the need to adjust sensors or cylinder strokes during the changeover process, reducing changeover time from over 60 minutes to less than 5 minutes, greatly improving the production line's flexible production capabilities. Furthermore, the intuitive alignment slots on the sides of the upper and lower cavities significantly reduce the difficulty of equipment installation, debugging, and changeover. Combined with integrated DIP switch control and automatic locking functions, the detection process is fully automated. Employees only need to handle loading, unloading, and rejecting defective products, effectively reducing labor costs and operational skill requirements. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of a polymer battery sealing performance testing device according to the present invention; Figure 2 This is a schematic diagram of the structure of the frame cover of the present invention; Figure 3 This is a schematic diagram of the upper cavity mechanism of the present invention; Figure 4 This is a side view of the upper cavity mechanism of the present invention; Figure 5 This is a schematic diagram of the lower cavity mechanism of the present invention; In the picture: 1. Frame cover; 101. Base plate; 102. Vertical plate; 103. Column; 104. Cylinder mounting plate; 105. Electrical cover; 106. Positive pressure gauge mounting bracket; 107. Positive pressure gauge; 108. DIP switch (cycle) box; 109. DIP switch (cycle); 110. DIP switch (time) box; 111. DIP switch (time); 112. Knob; 113. Air filter; 114. Connecting plate; 115. Door; 116. Hinge; 117. Bolt; 2; Upper cavity mechanism; 201, First thin cylinder; 202, Second thin cylinder; 203, Floating joint A; 204, Floating joint B; 205, Polyurethane pressure block; 206, Connecting block; 207, Connecting plate; 208, Linear guide rail (X direction); 209, Wedge block mounting plate; 210, Cylinder mounting seat; 211, Standard single-rod double-acting cylinder; 212, Floating joint C; 213, L-shaped connecting seat; 214, Wedge block; 215, Linear guide rail (Y direction); 216, Upper cavity; 217, Lower guide block; 218, Upper guide block; 219, Positive pressure joint; 3. Lower cavity mechanism; 301. Linear guide rail; 302. Cylinder (stroke 300); 303. Connecting plate; 304. Base plate; 305. Lower cavity connecting plate; 306. Lower cavity; 307. Sealing ring; 308. Sensor sensing element; 309. Sensor mount; 310. Groove sensor; 311. Buffer block; 312. Buffer mount; 313. Buffer. Detailed Implementation

[0017] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings and preferred embodiments.

[0018] like Figure 1 As shown, the detection device includes a frame cover, an upper cavity mechanism, and a lower cavity mechanism. The frame cover serves as the supporting foundation for the entire device. The upper cavity mechanism is located on the upper part of the frame cover, and the lower cavity mechanism is located on the frame cover and below the upper cavity mechanism.

[0019] like Figures 1 to 3As shown, the frame enclosure includes a base plate 101, a vertical plate 102, a column 103, a cylinder mounting plate 104, an electrical cover 105, a positive pressure gauge mounting bracket 106, a positive pressure gauge 107, a DIP switch (time) box 108, a DIP switch (time) box 109, a DIP switch (time) box 110, a DIP switch (time) box 111, a knob 112, an air filter 113, a connecting plate 114, a door 115, a hinge 116, and a latch 117. The upright plate 102, column 103, and connecting plate 114 are installed on the base plate 101. The cylinder mounting plate 104 is connected to the upright plate 102 and column 103. The electrical cover 105 is connected to the base plate 101 and cylinder mounting plate 104. The positive pressure gauge mounting bracket 106 and air filter 113 are installed on the electrical cover 105. The positive pressure gauge 107 is installed on the positive pressure gauge mounting bracket 106. The DIP switch (time) box 108 and DIP switch (time) box 110 are installed on the cylinder mounting plate 104. The DIP switch (time) 109 and knob 112 are installed on the DIP switch (time) box 108. The DIP switch (time) 111 and knob 112 are installed on the DIP switch (time) box 110. The door 115, hinge 116, and latch 117 are interconnected, and the door 115 can be opened for easy installation and debugging.

[0020] like Figure 2 and Figure 3 As shown, the upper cavity mechanism includes an upper cavity 216, a first drive assembly for driving the upper cavity 216 to rise and fall, a wedge block locking assembly, and a secondary pressure locking assembly.

[0021] Specifically, the first driving assembly includes a second thin cylinder 202 and a linear guide rail Y-axis 215. The linear guide rail Y-axis 215 is vertically mounted on the upright plate 102, and the upper cavity 216 is connected to the slider of the linear guide rail Y-axis 215, thereby achieving vertical guidance of the upper cavity 216. The cylinder body of the second thin cylinder 202 is mounted on the cylinder mounting plate 104, and the piston rod of the second thin cylinder 202 is connected to the connecting block 206 through the floating joint B204. The connecting block 206 is fixedly connected to the connecting plate 207, and the connecting plate 207 is fixedly connected to the upper cavity 216. When the second thin cylinder 202 is activated, it drives the upper cavity 216 to rise and fall along the linear guide rail Y-axis 215 through the floating joint B204, the connecting block 206, and the connecting plate 207. In this embodiment, the second thin cylinder 202 is a cylinder with a diameter of 12 mm, and there are two sets of them.

[0022] The wedge-shaped locking assembly is used to lock the upper cavity 216 and lower cavity 306 after they are closed, by inserting a wedge-shaped block 214 into the guide structure between them. Specifically, the wedge-shaped locking assembly includes a standard single-rod double-acting cylinder 211, a wedge-shaped block mounting plate 209, and a wedge-shaped block 214. The cylinder body of the standard single-rod double-acting cylinder 211 is mounted on the cylinder mounting plate 104 via a cylinder mounting seat 210. The wedge-shaped block mounting plate 209 is connected to an L-shaped connecting seat 213 via a floating joint C212, and the L-shaped connecting seat 213 is connected to the piston rod of the standard single-rod double-acting cylinder 211. The wedge-shaped block 214 is fixedly mounted on the wedge-shaped block mounting plate 209. An upper guide block 218 is provided on the upper cavity 216, and a lower guide block 217 is provided on the lower cavity 306. The mating areas of the wedge-shaped block 214, the upper guide block 218, and the lower guide block 217 are correspondingly arranged. To ensure smooth movement of the wedge block 214, the wedge block mounting plate 209 is mounted on the cylinder mounting plate 104 via a linear guide rail X-direction 208. The guiding direction of the linear guide rail X-direction 208 is parallel to the extension and retraction direction of the standard single-rod double-acting cylinder 211. In this embodiment, there are two sets of the standard single-rod double-acting cylinder 211, the wedge block 214, and related components, each corresponding to one of the two upper cavities 216.

[0023] The secondary pressure-locking assembly is used to apply a secondary vertical clamping force to the upper cavity 216 after the wedge block locking assembly has locked. Specifically, the secondary pressure-locking assembly includes a first thin cylinder 201 and a polyurethane pressure block 205. The cylinder body of the first thin cylinder 201 is mounted on the cylinder mounting plate 104. The polyurethane pressure block 205 is connected to the piston rod of the first thin cylinder 201 via a floating joint A203. The polyurethane pressure block 205 is correspondingly arranged with the connecting plate 207 of the upper cavity 216. When the first thin cylinder 201 is activated, it drives the polyurethane pressure block 205 to move downward, pressing the connecting plate 207, thereby applying an additional vertical locking force to the upper cavity 216. In this embodiment, the first thin cylinder 201 is a cylinder with a diameter of 16 mm.

[0024] like Figure 3 and Figure 4 As shown, the lower cavity mechanism includes a lower cavity 306 and a second drive assembly for driving the lower cavity 306 to move horizontally. The lower cavity 306 is detachably connected to a lower cavity connecting plate 305 via a standardized mounting interface, and the lower cavity connecting plate 305 is connected to the power output end of the second drive assembly. This modular design allows for easy testing of different battery models; only the lower cavity 306 with the corresponding cavity type needs to be replaced, without adjusting other components.

[0025] In this embodiment, the second driving component is a cylinder 302, and the cylinder body of the cylinder 302 is fixed on the base plate 101. The lower cavity mechanism also includes a linear guide rail 301, which is horizontally arranged on the base plate 101. The lower cavity connecting plate 305 is connected to the piston rod of the cylinder 302 through a connecting plate 303, and the lower cavity connecting plate 305 is connected to the slider of the linear guide rail 301. When the cylinder 302 is actuated, it drives the lower cavity connecting plate 305 and the lower cavity 306 mounted thereon to move horizontally along the linear guide rail 301 through the connecting plate 303. To improve detection efficiency, there are two lower cavities 306, which are arranged side by side on the lower cavity connecting plate 305; correspondingly, there are two upper cavities 216, which are arranged one-to-one with the lower cavities 306.

[0026] In addition, the lower cavity mechanism also includes a sensor assembly and a buffer assembly for precisely controlling the movement position of the lower cavity 306. Specifically, a sensor sensing piece 308 is installed on one side of the lower cavity connecting plate 304, and a sensor seat 309 and a grooved sensor 310 are installed at corresponding positions on the base plate 101; a buffer block 311 is installed on the other side of the lower cavity connecting plate 304, and a buffer seat 312 and a buffer 313 are installed at corresponding positions on the base plate 101. When the cylinder 302 drives the lower cavity 306 to move back and forth, the sensor sensing piece 308 senses the position of the grooved sensors 310 at both ends, and the buffer block 311 contacts the buffers 313 at both ends for buffering, thereby precisely controlling the cylinder stroke.

[0027] A sealing ring 307 is embedded in the internal groove of the lower cavity 306 to seal the cavity when the upper cavity 216 and the lower cavity 306 are closed. A positive pressure connector 219 is provided on the upper cavity 216 to fill the closed cavity with compressed air.

[0028] To facilitate installation, debugging, and equipment maintenance, the upper cavity 216 and lower cavity 306 have corresponding slots on their sides for alignment observation after they are closed. Operators can directly judge the alignment accuracy of the upper and lower cavities by observing whether the slots are aligned.

[0029] The working process of the polymer battery sealing test device according to an embodiment of the present invention will be described in detail below.

[0030] Initially, the upper cavity 216 is in the raised position, and the lower cavity 306 is in the extended position. The operator places the polymer battery to be tested into the cavity of the lower cavity 306.

[0031] After the detection is initiated, the control system controls the cylinder 302 to move, causing the lower cavity 306 to move backward to the detection station. Once the lower cavity 306 is in position, the accurate position is confirmed by the cooperation of the sensor sensing plate 308 and the grooved sensor 310.

[0032] Subsequently, the control system controls the second thin cylinder 202 to move, which, through the floating joint B204, connecting block 206, and connecting plate 207, drives the upper cavity 216 to descend along the linear guide rail Y direction 215, closing with the lower cavity 306. The sealing ring 307 on the lower cavity 306 is compressed, forming a preliminary seal.

[0033] After the upper cavity 216 is closed in place, the control system controls the standard single-rod double-acting cylinder 211 to move. Through the floating joint C212 and L-shaped connecting seat 213, the wedge block mounting plate 209 moves horizontally along the linear guide rail X-axis 208, causing the wedge block 214 to insert into the mating area between the upper guide block 218 and the lower guide block 217. Utilizing the self-locking principle of the wedge block's inclined surface, the upper cavity 216 and lower cavity 306 are further locked together, eliminating mechanical clearance.

[0034] After the wedge block is locked, the control system controls the first thin cylinder 201 to move, which drives the polyurethane pressure block 205 to move downward, presses the connecting plate 207, and applies a second vertical pressing force to the upper cavity 216 to further ensure the airtightness of the upper and lower cavities.

[0035] At this point, the double locking is complete. The control system injects compressed air at a set pressure into the closed cavity through the positive pressure connector 219. If the battery surface is damaged, gas will enter the battery through the damaged area, causing bulges on the battery surface; if the battery is well sealed, there will be no change on the battery surface.

[0036] After the pressure holding test is completed, the control system controls the first thin cylinder 201 to retract, releasing the secondary pressure lock; controls the standard single-rod double-acting cylinder 211 to retract, driving the wedge block 214 to exit and releasing the lock; controls the second thin cylinder 202 to move, driving the upper cavity 216 to rise and reset; controls the cylinder 302 to move, driving the lower cavity 306 to extend forward to the initial position.

[0037] Operators observe the battery surface and reject defective products with bulging, while good products proceed to the next process. DIP switches (number of tests) 109 and (time) 111 can be used to set parameters such as the number of tests and the holding time.

[0038] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A polymer battery tightness detection device, characterized by, It includes a frame outer cover (1), an upper cavity mechanism (2), and a lower cavity mechanism (3); The upper cavity mechanism (2) is disposed on the outer cover of the frame (1), and the lower cavity mechanism (3) is disposed on the outer cover of the frame (1) and located below the upper cavity mechanism (2); The upper cavity mechanism (2) includes an upper cavity (216), a first drive assembly for driving the upper cavity (216) to rise and fall, a wedge block locking assembly, and a secondary pressure locking assembly; The lower cavity mechanism (3) includes a lower cavity (306) and a second drive assembly for driving the lower cavity (306) to move horizontally; The wedge-shaped locking assembly is used to lock the upper cavity (216) and the lower cavity (306) after they are closed by inserting a wedge-shaped block (214) into the guide structure between them. The secondary pressure locking assembly is used to apply a secondary pressure force in the vertical direction to the upper cavity (216) after the wedge block locking assembly has been locked.

2. The polymer battery tightness detection device according to claim 1, characterized by, The wedge block locking assembly includes a standard single-rod double-acting cylinder (211), a wedge block mounting plate (209), and a wedge block (214); The cylinder body of the standard single-rod double-acting cylinder (211) is mounted on the cylinder mounting plate (104) of the frame outer cover (1) via a cylinder mounting seat (210); The wedge-shaped mounting plate (209) is connected to the L-shaped connecting seat (213) via a floating joint C (212), and the L-shaped connecting seat (213) is connected to the piston rod of the standard single-rod double-acting cylinder (211). The wedge block (214) is fixedly mounted on the wedge block mounting plate (209); An upper guide block (218) is provided on the upper cavity (216), and a lower guide block (217) is provided on the lower cavity (306); The wedge block (214) is configured to correspond to the mating areas of the upper guide block (218) and the lower guide block (217).

3. The polymer battery tightness detection device according to claim 2, characterized by, The wedge-shaped block mounting plate (209) is mounted on the cylinder mounting plate (104) via a linear guide rail X (208), and the guiding direction of the linear guide rail X (208) is parallel to the extension and retraction direction of the standard single-rod double-acting cylinder (211).

4. The polymer battery tightness detection device according to claim 1, characterized by, The secondary pressure-locking assembly includes a thin cylinder (201) and a polyurethane pressure block (205); The cylinder body of the thin cylinder (201) is mounted on the cylinder mounting plate (104) of the frame cover (1); The polyurethane pressure block (205) is connected to the piston rod of the thin cylinder (201) via a floating joint A (203); The polyurethane pressure block (205) is correspondingly provided with the connecting plate (207) of the upper cavity (216) or the body of the upper cavity (216).

5. The polymer battery tightness detection device according to claim 1, characterized by, The first drive assembly includes a thin cylinder (202) and a linear guide rail (215) in the Y direction; The linear guide rail Y-direction (215) is vertically disposed on the upright plate (102) of the frame outer cover (1), and the upper cavity (216) is connected to the slider of the linear guide rail Y-direction (215); The cylinder body of the thin cylinder (202) is mounted on the cylinder mounting plate (104) of the frame cover (1). The piston rod of the thin cylinder (202) is connected to the connecting block (206) through the floating joint B (204). The connecting block (206) is fixedly connected to the connecting plate (207). The connecting plate (207) is fixedly connected to the upper cavity (216).

6. The polymer battery tightness detection device according to claim 1, characterized by, In the lower cavity mechanism (3), the lower cavity (306) is detachably connected to the lower cavity connecting plate (305) through a standardized installation interface, and the lower cavity connecting plate (305) is connected to the power output end of the second drive component.

7. The polymer battery tightness detection device according to claim 6, characterized by The second drive component is a cylinder (302), and the cylinder body of the cylinder (302) is fixed on the bottom plate (101) of the frame cover (1); The lower cavity mechanism (3) further includes a linear guide rail (301), which is arranged horizontally on the base plate (101); The lower cavity connecting plate (305) is connected to the piston rod of the cylinder (302) through the connecting plate (303), and the lower cavity connecting plate (305) is connected to the slider of the linear guide rail (301).

8. The polymer battery sealing performance testing device according to claim 1, characterized in that, After the upper cavity (216) and the lower cavity (306) are closed, corresponding slots for alignment observation are opened on their sides.

9. The polymer battery sealing performance testing device according to claim 1, characterized in that, There are two lower cavities (306), which are arranged side by side on the lower cavity connecting plate (305); there are two upper cavities (216), which are arranged one-to-one with the lower cavities (306).

10. The polymer battery sealing performance testing device according to claim 1, characterized in that, It also includes a control system, which is electrically connected to the second drive assembly, the first drive assembly, the wedge block locking assembly, the secondary pressure locking assembly and the inflation device, and is used to control the complete action process of the lower cavity (306) moving into place, the upper cavity (216) descending and closing, the wedge block locking assembly locking, the secondary pressure locking assembly locking, and inflation detection into the closed cavity.

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