Compression tool for air tightness test of battery pack

Abstract

The utility model relates to a compaction tool for airtight test of a battery pack, which comprises a compaction square tube assembly with adjustable length, first clamping assemblies and a second clamping assembly, the first clamping assemblies are arranged at two ends of the compaction square tube assembly, and the second clamping assembly is arranged at one end of the first clamping assembly far away from the compaction square tube assembly. The first clamping assembly comprises a first adjusting piece and a connecting screw rod, the two ends of the connecting screw rod are connected with the pressing square pipe assembly and the second clamping assembly respectively, the second clamping assembly comprises a U-shaped fixing block and a second adjusting piece, one end of the connecting screw rod is connected with the U-shaped fixing block, and the second adjusting piece is movably arranged in an opening of the U-shaped fixing block. The second clamping assembly is used for clamping and fixing the second clamping assembly on the two sides of the battery pack, and the first clamping assembly is used for adjusting the distance between the square tube pressing assembly and the second clamping assembly; the adaptability of the battery pack pressing tool can be improved, the clamping stability is improved, and the problem of uneven pressure is avoided.

Description

Technical Field

[0001] This utility model relates to the field of automotive power battery technology, specifically to a clamping fixture for battery pack airtightness testing. Background Technology

[0002] Power batteries are a core component of new energy vehicles, directly affecting the overall safety of the vehicle. Due to the relatively high cost of battery packs, non-destructive testing is necessary. After production or after-sales maintenance, airtightness testing of the power battery is a crucial inspection item to prevent leakage. With increased production capacity and cost control in the battery pack manufacturing industry, traditional water immersion testing methods are no longer sufficient. Using traditional immersion methods may damage the internal structure of the battery pack, making secondary maintenance difficult. Since battery packs typically have pre-drilled waterproof vents, airtightness can be tested by directly inflating them. During testing, gas is injected into the battery pack to increase pressure, and the pressure change over a certain period is observed to determine if the battery manufacturing process meets requirements. However, if the battery pack expands and deforms due to pressure changes during inflation, it severely affects the test results. Therefore, clamping fixtures are needed to reinforce the battery pack to reduce deformation and ensure test accuracy.

[0003] In related technologies, power battery clamping fixtures have simple structures and poor adaptability. They can only be adapted to specific battery pack specifications and are fixed by clamping the battery pack with hooks or baffles at both ends of the clamp. This structure is extremely inconvenient to install, has an unsatisfactory fixing effect, and is prone to loosening or even uneven pressure during use, which affects the test results. Utility Model Content

[0004] In view of this, a clamping fixture for battery pack airtightness testing is provided, which can improve the adaptability of battery pack clamping fixtures, improve clamping stability, and avoid the problem of uneven pressure.

[0005] A clamping fixture for battery pack airtightness testing includes an adjustable-length clamping square tube assembly, a first clamping assembly, and a second clamping assembly. The first clamping assembly is disposed at both ends of the clamping square tube assembly, and the second clamping assembly is disposed at the end of the first clamping assembly away from the clamping square tube assembly. The first clamping assembly includes a first adjusting member and a connecting screw. The two ends of the connecting screw are respectively connected to the clamping square tube assembly and the second clamping assembly. The second clamping assembly includes a U-shaped fixing block and a second adjusting member. One end of the connecting screw is connected to the U-shaped fixing block, and the second adjusting member is movably disposed within the opening of the U-shaped fixing block. The second clamping assembly is used to clamp and fix the second clamping assembly to both sides of the battery pack. The first clamping assembly is used to adjust the distance between the clamping square tube assembly and the second clamping assembly, thereby causing the clamping square tube assembly to abut against the outer shell of the battery pack, reducing the deformation of the battery pack and ensuring test accuracy.

[0006] As a preferred embodiment, the second adjusting component includes a pressure plate and an adjusting screw. The U-shaped fixing block includes a connecting plate and two parallel clamping plates. The two clamping plates are respectively disposed at both ends of the connecting plate. The clamping plates are provided with adjusting screw holes. The adjusting screw is adapted to the adjusting screw holes and is screwed through and engaged in the adjusting screw holes. The pressure plate is disposed at one end of the adjusting screw and is disposed between the two clamping plates.

[0007] As a preferred embodiment, the first adjusting component is an adjusting handwheel, and the end of the connecting screw away from the second clamping assembly is provided with a threaded portion. The threaded portion passes through the clamping square tube assembly, and the adjusting handwheel is screwed onto the threaded portion. The adjusting handwheel is located on the side of the clamping square tube assembly away from the second clamping assembly.

[0008] As a preferred embodiment, the compression square tube assembly includes a compression outer tube and two compression inner tubes. The two compression inner tubes are movably disposed inside the compression outer tube, and one end of each tube extends out of the outer side of the compression outer tube. The connecting screw passes through the compression inner tube.

[0009] As a preferred embodiment, the inner compression tube is provided with a first through groove, which extends along the length of the inner compression tube, and the connecting screw passes through the upper and lower ends of the first through groove.

[0010] As a preferred embodiment, the outer clamping tube is provided with two second through grooves, which extend along the length direction of the outer clamping tube and the length axes of the two second through grooves are on the same straight line. The inner clamping tube is provided with a limiting block, which is disposed in the second through groove and moves along the extension direction of the second through groove. The outer clamping tube is provided with a receiving fastener, which is used to fix the two limiting blocks in the two second through grooves at a position close to each other.

[0011] As a preferred embodiment, the outer compression tube is provided with a receiving screw, the receiving fastener includes a U-shaped fastener and a receiving nut, the middle part of the U-shaped fastener is sleeved on the receiving screw, the receiving nut is screwed on the receiving screw, the limiting block is provided with a limiting recess, and the U-shaped fastener is provided with a limiting protrusion corresponding to the limiting recess.

[0012] As a preferred embodiment, the lower end of the compression square tube assembly is provided with several buffer pads.

[0013] The aforementioned clamping fixture for battery pack airtightness testing features an adjustable-length clamping square tube assembly to accommodate battery packs of different specifications, enhancing its adaptability. A second clamping assembly ensures the fixture is more securely fixed to the battery pack, preventing loosening during use and improving both the pack's stability and the fixture's hold. Furthermore, adjusting the first adjusting pieces at both ends allows the clamping square tube assembly to abut against the battery pack's outer shell, ensuring even force distribution and preventing uneven pressure, thus improving testing results. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the assembly structure of an embodiment of the present utility model;

[0015] Figure 2 This is a front view structural diagram of an embodiment of the present utility model;

[0016] Figure 3 This is an exploded structural diagram of an embodiment of the present utility model;

[0017] Figure 4 This is an embodiment of the present utility model. Figure 3 Enlarged view of point A in the middle;

[0018] Figure 5 This is a schematic diagram illustrating the operation of pressing the battery pack according to an embodiment of the present invention.

[0019] Explanation of reference numerals in the attached figures:

[0020] 100. Pressing square tube assembly; 110. Pressing outer tube; 111. Second through groove; 112. Receiving screw; 120. Pressing inner tube; 121. First through groove; 122. Limiting block; 123. Limiting recess; 130. Buffer pad;

[0021] 200. First clamping assembly; 210. First adjusting component; 211. Adjusting handwheel; 220. Connecting screw; 221. Threaded part;

[0022] 300. Second clamping assembly; 310. U-shaped fixing block; 311. Connecting plate; 312. Clamping plate; 313. Adjusting screw hole; 320. Second adjusting component; 321. Pressure plate; 322. Adjusting screw;

[0023] 400. Storage fastener; 410. U-shaped fastener; 411. Limiting protrusion; 420. Storage nut. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all 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 protection scope of the present utility model.

[0025] Please see Figures 1-5 This illustration shows a clamping fixture for battery pack airtightness testing, comprising an adjustable-length clamping square tube assembly 100, a first clamping assembly 200, and a second clamping assembly 300. The first clamping assembly 200 is disposed at both ends of the clamping square tube assembly 100, and the second clamping assembly 300 is disposed at the end of the first clamping assembly 200 away from the clamping square tube assembly 100. The first clamping assembly 200 includes a first adjusting member 210 and a connecting screw 220, the two ends of which are respectively connected to the adjustable-length clamping square tube assembly 100 and the second clamping assembly 300. Next, the second clamping assembly 300 includes a U-shaped fixing block 310 and a second adjusting member 320. One end of the connecting screw 220 is adjustablely connected to the U-shaped fixing block 310. The second adjusting member 320 is movably disposed in the opening of the U-shaped fixing block 310. The second clamping assembly 300 is used to clamp and fix the second clamping assembly 300 on both sides of the battery pack. The first clamping assembly 200 is used to adjust the distance between the pressing square tube assembly 100 and the second clamping assembly 300, so that the pressing square tube assembly 100 is abutted against the outer shell of the battery pack, reducing the deformation of the battery box and ensuring test accuracy.

[0026] In this embodiment, the second adjusting member 320 includes a pressure plate 321 and an adjusting screw 322. The U-shaped fixing block 310 includes a connecting plate 311 and two parallel clamping plates 312. The two clamping plates 312 are respectively disposed at both ends of the connecting plate 311. The clamping plates 312 are provided with adjusting screw holes 313. The adjusting screw 322 is adapted to the adjusting screw holes 313 and is screwed into the adjusting screw holes 313. The pressure plate 321 is disposed at one end of the adjusting screw 322 and is disposed between the two clamping plates 312, and is parallel to the clamping plates 312. By rotating the adjusting screw 322, the distance between the pressure plate 321 and the clamping plates 312 is adjusted. When the distance between the pressure plate 321 and the clamping plates 312 is adjusted to be the same as the thickness of the side flange of the battery pack, the second clamping assembly 300 can be clamped and fixed on both sides of the battery pack.

[0027] Further, the first adjusting member 210 is an adjusting handwheel 211. The end of the connecting screw 220 away from the second clamping assembly 300 is provided with a threaded portion 221. The threaded portion 221 passes through the clamping square tube assembly 100, and the adjusting handwheel 211 is screwed onto the threaded portion 221. The adjusting handwheel 211 is located on the side of the clamping square tube assembly 100 away from the second clamping assembly 300. During installation, by rotating the adjusting handwheel 211, it can be made to abut against one side of the clamping square tube assembly 100, thereby causing the clamping square tube assembly 100 to tightly abut against the battery pack.

[0028] Furthermore, the clamping square tube assembly 100 includes a clamping outer tube 110 and two clamping inner tubes 120. The two clamping inner tubes 120 are movably disposed within the clamping outer tube 110, with one end extending beyond the outer side of the clamping outer tube 110. The connecting screw 220 passes through the clamping inner tubes 120. The clamping outer tube 110 and the clamping inner tubes 120 are adapted to each other. By extending and retracting the two clamping inner tubes 120 along the length of the clamping outer tube 110, battery packs of different widths can be accommodated, and the volume of the clamping fixture can be reduced for easy storage.

[0029] Furthermore, the inner clamping tube 120 is provided with a first through groove 121, which extends along the length of the inner clamping tube 120. The connecting screw 220 passes through the upper and lower ends of the first through groove 121. The through groove facilitates adjustment of the length of the battery pack held by the clamping square tube assembly 100 to accommodate battery packs of different widths.

[0030] Furthermore, the outer compression tube 110 is provided with two second through grooves 111, which extend along the length of the outer compression tube 110 and the length axes of the two second through grooves 111 are on the same straight line. The inner compression tube 120 is provided with a limiting block 122, which is disposed in the second through groove 111 and moves along the extension direction of the second through groove 111. The outer compression tube 110 is provided with a storage fastener 400, which is used to fix the two limiting blocks 122 in a position close to each other in the two second through grooves 111, thereby preventing the inner compression tube 120 from moving during storage and improving the stability of storage.

[0031] Furthermore, the outer compression tube 110 is provided with a receiving screw 112, and the receiving fastener 400 includes a U-shaped fastener 410 and a receiving nut 420. The middle part of the U-shaped fastener 410 is sleeved on the receiving screw 112, and the receiving nut 420 is screwed on the receiving screw 112. The limiting block 122 is provided with a limiting recess 123, and the U-shaped fastener 410 is provided with a limiting protrusion 411 corresponding to the limiting recess 123. During storage, the two inner compression tubes 120 are slid together inside the outer compression tube 110 in a direction that brings them closer to each other, so that the two limiting blocks 122 are positioned close to each other in the two second through grooves 111. Then, the limiting protrusions 411 of the U-shaped fastener 410 are respectively embedded into the limiting recesses 123 of the two limiting blocks 122. Then, by rotating the storage nut 420, the U-shaped fastener 410 is fixed on the storage screw 112, thereby storing the compression square tube assembly 100 and reducing the space occupied by the compression square tube assembly 100.

[0032] Furthermore, the lower end of the compression square tube assembly 100 is provided with several buffer pads 130. The buffer pads 130 are made of PU polyurethane and are fixed to the lower end of the compression square tube assembly 100 by screws. The buffer pads 130 are the parts that directly contact the metal shell of the battery pack and have a certain degree of softness and elasticity to ensure that the battery pack shell is not damaged while pressure is applied.

[0033] The operation process of this embodiment is as follows:

[0034] 1. Unscrew the storage buckle 400, unlock the clamping inner tube 120, and pull the clamping inner tube 120 to both ends of the battery pack to ensure that the U-shaped fixing block 310 can cover the lower edge of the battery pack;

[0035] 2. Insert the two U-shaped fixing blocks 310 into the lower edges of the battery pack on both sides respectively, and tighten the adjusting screws 322 on the U-shaped fixing blocks 310 to press them with appropriate torque so that the second clamping assembly 300 is fixed on the lower edges of the battery pack on both sides.

[0036] 3. After checking whether the buffer pad 130 is flat against the battery pack shell, rotate the adjusting handwheels 211 on both sides to press the entire clamping square tube assembly 100 against the battery pack.

[0037] The aforementioned clamping fixture for battery pack airtightness testing features an adjustable-length clamping square tube assembly 100 to accommodate battery packs of different specifications, thus improving its adaptability. A second clamping assembly 300 ensures the clamping fixture is more securely fixed to the battery pack, preventing loosening during use and enhancing both the pack's stability and the fixture's fixation. Furthermore, adjusting the first adjusting members 210 at both ends allows the clamping square tube assembly 100 to abut against the battery pack's outer shell, ensuring uniform force distribution and preventing uneven pressure, thereby improving testing results.

[0038] It should be noted that this utility model is not limited to the above-described embodiments. Based on the inventive spirit of this utility model, those skilled in the art can make other changes, and these changes made based on the inventive spirit of this utility model should be included within the scope of protection claimed by this utility model.

Claims

1. A clamping fixture for battery pack airtightness testing, characterized in that, The device includes an adjustable-length clamping square tube assembly (100), a first clamping assembly (200), and a second clamping assembly (300). The first clamping assembly (200) is disposed at both ends of the clamping square tube assembly (100), and the second clamping assembly (300) is disposed at the end of the first clamping assembly (200) away from the clamping square tube assembly (100). The first clamping assembly (200) includes a first adjusting member (210) and a connecting screw (220). The two ends of the connecting screw (220) are respectively connected to the clamping square tube assembly (100) and the second clamping assembly. The first clamping assembly (200) is connected to the second clamping assembly (300), which includes a U-shaped fixing block (310) and a second adjusting member (320). One end of the connecting screw (220) is connected to the U-shaped fixing block (310), and the second adjusting member (320) is movably disposed in the opening of the U-shaped fixing block (310). The second clamping assembly (300) is used to clamp and fix the second clamping assembly (300) on both sides of the battery pack. The first clamping assembly (200) is used to adjust the distance between the pressing square tube assembly (100) and the second clamping assembly (300).

2. The clamping fixture for battery pack airtightness testing as described in claim 1, characterized in that, The second adjusting component (320) includes a pressure plate (321) and an adjusting screw (322). The U-shaped fixing block (310) includes a connecting plate (311) and two parallel clamping plates (312). The two clamping plates (312) are respectively disposed at both ends of the connecting plate (311). The clamping plates (312) are provided with adjusting screw holes (313). The adjusting screw (322) is adapted to the adjusting screw hole (313) and the adjusting screw (322) is threaded and screwed into the adjusting screw hole (313). The pressure plate (321) is disposed at one end of the adjusting screw (322) and is disposed between the two clamping plates (312).

3. The clamping fixture for battery pack airtightness testing as described in claim 1, characterized in that, The first adjusting member (210) is an adjusting handwheel (211). The end of the connecting screw (220) away from the second clamping assembly (300) is provided with a threaded part (221). The threaded part (221) passes through the pressing square tube assembly (100). The adjusting handwheel (211) is screwed into the threaded part (221). The adjusting handwheel (211) is located on the side of the pressing square tube assembly (100) away from the second clamping assembly (300).

4. The clamping fixture for battery pack airtightness testing as described in claim 1, characterized in that, The clamping square tube assembly (100) includes a clamping outer tube (110) and two clamping inner tubes (120). The two clamping inner tubes (120) are movably disposed inside the clamping outer tube (110), and one end of each tube extends out of the outer side of the clamping outer tube (110). The connecting screw (220) passes through the clamping inner tube (120).

5. The clamping fixture for battery pack airtightness testing as described in claim 4, characterized in that, The inner compression tube (120) is provided with a first through groove (121), which extends along the length of the inner compression tube (120), and the connecting screw (220) passes through the upper and lower ends of the first through groove (121).

6. The clamping fixture for battery pack airtightness testing as described in claim 4, characterized in that, The outer compression tube (110) is provided with two second through grooves (111), which extend along the length of the outer compression tube (110). The inner compression tube (120) is provided with a limiting block (122), which is disposed in the second through groove (111) and moves along the extension direction of the second through groove (111). The outer compression tube (110) is provided with a storage fastener (400), which is used to fix the two limiting blocks (122) in a position close to each other in the two second through grooves (111).

7. The clamping fixture for battery pack airtightness testing as described in claim 6, characterized in that, The outer compression tube (110) is provided with a receiving screw (112), and the receiving fastener (400) includes a U-shaped fastener (410) and a receiving nut (420). The middle part of the U-shaped fastener (410) is sleeved on the receiving screw (112), and the receiving nut (420) is screwed on the receiving screw (112). The limiting block (122) is provided with a limiting recess (123), and the U-shaped fastener (410) is provided with a limiting protrusion (411) corresponding to the limiting recess (123).

8. The clamping fixture for battery pack airtightness testing as described in claim 1, characterized in that, The lower end of the compression square tube assembly (100) is provided with a buffer pad (130).

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