A protective fixture for testing the airtightness of battery packs

Abstract

This utility model relates to the field of battery pack production and testing technology, and in particular to a protective fixture for battery pack airtightness testing, comprising a frame unit and a clamping mechanism; the frame unit includes a protective plate for fitting against the upper cover surface of the battery pack; the clamping mechanism is disposed on at least two sides of the frame unit, and the clamping mechanism includes a connecting unit and a clamping member; the connecting unit is adjustablely disposed on the frame unit to adapt to the clamping and installation of different models of battery packs; the clamping member is hinged to the connecting unit, and the clamping member is configured to clamp or release the lower edge of the battery pack by rotation; this utility model can protect various models of battery packs undergoing airtightness testing, avoiding or reducing deformation during battery pack airtightness testing.

Description

Technical Field

[0001] This utility model relates to the field of battery pack production and testing technology, and in particular to a protective tooling for testing the airtightness of battery packs. Background Technology

[0002] In the production process of new energy power batteries, the airtightness of the entire battery pack needs to be tested after the battery pack is produced to prevent air leakage and water ingress that could cause safety issues.

[0003] During testing, compressed gas needs to be injected into the battery pack, and changes in gas pressure are monitored to determine if there is a leak. However, the inflation process can cause the battery pack cover to bulge and deform. Especially when thin-walled materials (such as SMC and PCM) are used, excessive deformation can cause the cover to crack, increasing the test failure rate and repair costs. Summary of the Invention

[0004] This utility model provides a protective fixture for testing the airtightness of battery packs, which can protect various types of battery packs undergoing airtightness testing and avoid or reduce deformation during the airtightness testing.

[0005] This utility model provides a protective fixture for testing the airtightness of a battery pack, comprising:

[0006] The frame unit includes a protective plate for fitting against the top cover surface of the battery pack;

[0007] A positioning unit is positioned adjustablely within the frame unit to accommodate the positioning of different battery pack models.

[0008] A clamping mechanism is provided at least on both sides of the frame unit, and the clamping mechanism includes:

[0009] The connecting unit is positioned adjustablely within the frame unit to accommodate clamping and mounting of different battery pack models.

[0010] A clamping element, hinged to the connecting unit, is configured to clamp or release the lower edge of the battery pack by rotation.

[0011] In one embodiment of the present invention, a threaded self-locking component is provided on the upper or lower part of the connecting unit;

[0012] The threaded self-locking member is used to move along a first direction to lock the connecting unit to the frame unit, and the clamping member follows the connecting unit to move in the first direction to fit against or move away from the edge of the battery pack, wherein the first direction is the thickness direction of the battery pack.

[0013] In one embodiment of the present invention, a locking unit is provided between the connecting unit and the clamping member, the locking unit being used to lock the clamping member in a released and / or clamped state.

[0014] In one embodiment of the present invention, the locking unit includes:

[0015] A locking hook is provided on the clamping member;

[0016] A limiting member is provided on the connecting unit and cooperates with the locking hook to lock the position of the clamping member when the clamping member is in the released state.

[0017] In one embodiment of the present invention, the connecting unit includes a downwardly extending connecting plate, the connecting plate being provided with a locking through hole, and first holes being provided on both sides of the locking through hole;

[0018] The limiting member is a limiting ball or an elastic protrusion. The limiting member is located in the first hole. The end of the locking hook away from the clamping member is provided with an engaging part. After the locking hook extends into the locking through hole, the engaging part is adapted to limit the locking member. The limiting member is configured such that when the clamping member is driven to rotate, and the rotational driving force that causes the locking hook to disengage from the locking through hole is greater than a preset threshold, the engaging part disengages from the limiting member.

[0019] In one embodiment of the present invention, a stud is provided in the first hole, one end of the stud is threadedly connected to the first hole, the limiting ball is movably embedded in the other end of the stud, and at least a portion of the surface of the limiting ball is exposed outside the stud.

[0020] In one embodiment of this utility model, the frame unit is provided with multiple lifting rings.

[0021] In one embodiment of the present invention, the frame unit includes a plurality of interconnected crossbeams and longitudinal beams, and the protective plate is fixed to the bottom of the crossbeams and longitudinal beams.

[0022] In one embodiment of the present invention, the battery pack airtightness testing protective fixture further includes a positioning unit disposed on the frame unit, the positioning unit being used to be adapted to and positioned with the positioning holes on the edge of the battery pack.

[0023] In one embodiment of this utility model, the threaded self-locking component is a spur bolt.

[0024] The beneficial effects of this utility model are as follows: By attaching the protective plate to the surface of the battery pack cover and hooking the edge of the battery pack bottom shell after the clamping member rotates, the protective plate is limited. This can suppress the bulging and deformation of the battery pack cover during airtightness testing when the battery pack is inflated, thereby reducing the risk of cracking of thin-walled materials. The connecting unit can be adjusted independently so that the clamping member avoids external protrusions or interfaces of the battery pack. This allows the airtightness testing protective fixture of the battery pack in this invention to be adapted to battery packs of different sizes or models, and has a wide range of applications. Attached Figure Description

[0025] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. Attached image description:

[0027] Figure 1 This is a schematic diagram of the protective tooling structure for testing the airtightness of a battery pack according to an embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram of the bottom structure of the battery pack airtightness testing protective fixture provided in one embodiment of the present invention;

[0029] Figure 3 This is a schematic diagram of the structure of the battery pack airtightness testing protective fixture installed on the battery in one embodiment of the present invention, wherein part of the clamping mechanism is in the released state and the other part of the clamping mechanism is in the clamping state.

[0030] Figure 4 This is a schematic diagram of the battery pack structure provided in one embodiment of the present invention;

[0031] Figure 5 This is a schematic diagram of the clamping mechanism in the released state according to one embodiment of the present invention;

[0032] Figure 6 This is a schematic diagram of the clamping mechanism in a clamping state provided in one embodiment of the present invention;

[0033] Figure 7 This is a schematic diagram of one side of the clamping mechanism provided in one embodiment of the present invention;

[0034] Figure 8 This is a structural cross-sectional view of the clamping mechanism provided in one embodiment of the present invention;

[0035] The attached figures are labeled as follows: battery pack 100, top cover 101, positioning hole 102, frame unit 1, protective plate 11, crossbeam 12, longitudinal beam 13, angle steel 14, positioning unit 2, positioning pin 21, clamping part 3, connecting unit 4, connecting plate 41, locking through hole 411, threaded self-locking part 5, locking unit 6, locking hook 61, engaging part 611, limiting part 62, limiting ball 621, stud 622, lifting ring 7, first direction A. Detailed Implementation

[0036] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0037] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0038] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the present invention. However, it will be apparent to those skilled in the art that embodiments of the present invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the present invention.

[0039] Please see Figures 1 to 4 This utility model provides a protective fixture for testing the airtightness of a battery pack, including a frame unit 1 and a clamping mechanism. The frame unit 1 includes a protective plate 11, which is used to fit the surface of the upper cover 101 of the battery pack 100. The clamping mechanism is provided on at least two sides of the frame unit 1, and includes a connecting unit 4 and a clamping member 3. The connecting unit 4 is positionally adjustable in the frame unit 1 to adapt to clamping and installing different models of battery packs 100. The clamping member 3 is hinged to the connecting unit 4, and the clamping member 3 is configured to clamp or release the lower edge of the battery pack 100 by rotation.

[0040] It should be noted that the frame unit 1 includes a protective plate 11, which is used to directly adhere to the surface of the top cover 101 of the battery pack 100. The protective plate 11 can be made of metal, engineering plastic, or composite material, and its surface can be provided with a buffer layer (such as a rubber pad or silicone layer) to avoid scratching the battery pack 100. Clamping mechanisms are distributed at least on both sides of the frame unit 1, including a connecting unit 4 and a clamping member 3. The connecting unit 4 is adjustablely mounted to the frame unit 1 via a sliding groove, guide rail, or adjusting bracket, so that the clamping point can be adapted to the edge structure of different battery pack 100 models. The connecting unit 4 can be an L-shaped bracket, a slider base, or a universal adjusting member. The clamping member 3 is hinged to the connecting unit 4, and clamping or releasing actions are achieved by rotating around an axis. Its clamping end can be designed as a hook, L-shaped, or with a roller structure for hooking or supporting the lower edge of the bottom shell of the battery pack 100.

[0041] The fixture in this case uses a protective plate 11 to adhere to the surface of the top cover 101 of the battery pack 100, directly limiting the bulging deformation of the top cover 101 during inflation. The clamping member 3 rotates and hooks onto the edge of the bottom shell of the battery pack 100, thereby limiting the position of the protective plate 11 and preventing displacement due to the expansion of the battery pack 100. This suppresses the bulging deformation of the battery pack 100 and reduces the risk of cracking of the thin-walled material of the top cover 101. The position of the connecting unit 4 is adjustable, using a mechanical structure to adjust the position and edge contour of the positioning hole 102 to adapt to different battery packs 100, achieving universal protection.

[0042] When the battery pack 100 is inflated for airtightness testing, the top cover 101 of the battery pack 100 is prone to bulging and deformation, especially the thin-walled battery pack 100, which is prone to cracking due to excessive stress during testing. Furthermore, if a fixed battery pack airtightness testing protective fixture is used, it cannot accommodate battery packs 100 of different sizes, with different positioning hole 102 positions, and different edge structures, leading to frequent replacements of the battery pack airtightness testing protective fixture on the production line. Therefore, in this case, the protective plate 11 is used to attach the battery pack 100. The surface of the top cover 101 is hooked onto the edge of the bottom shell of the battery pack 100 by the rotating clamping member 3 to limit the protective plate 11. This can suppress the bulging and deformation of the top cover 101 of the battery pack 100 when the battery pack 100 is inflated for air tightness testing, thereby reducing the risk of cracking of thin-walled materials. The connecting unit 4 is independently adjustable so that the clamping member 3 avoids external protrusions or interfaces of the battery pack 100, so that the air tightness testing protective fixture of the battery pack in this case can adapt to battery packs 100 of different sizes or models.

[0043] Please see Figure 1 , Figures 5 to 6 As an optional embodiment of this utility model, the upper or lower part of the connecting unit 4 is provided with a threaded self-locking member 5;

[0044] The threaded self-locking member 5 is used to move along the first direction A to lock the connecting unit 4 to the frame unit 1. The clamping member 3 follows the connecting unit 4 to move in the first direction A to fit against or move away from the edge of the battery pack 100, wherein the first direction A is the thickness direction of the battery pack 100.

[0045] It should be noted that a threaded self-locking component 5 is configured on the upper or lower part of the connecting unit 4 to achieve locking and fine-tuning of the position of the connecting unit 4. The threaded self-locking component 5 can be a screw bolt, a wing nut, or a hand screw, which generates axial displacement through the rotation of the threaded pair. The threaded self-locking component 5 moves along the thickness direction (first direction A) of the battery pack 100, generating friction by abutting against the surface of the frame unit 1, thereby locking and fixing the connecting unit 4; when the threaded self-locking component 5 is rotated, its axial displacement causes the connecting unit 4 and the clamping component 3 to move synchronously along the thickness direction, so that the clamping component 3 is in contact with or away from the edge of the battery pack 100, eliminating assembly gaps.

[0046] Traditional bolt tightening requires additional tools and is difficult to control the clamping force, easily leading to gaps or overpressure between the clamping component 3 and the battery pack 100. Simultaneously, fixed clamping mechanisms cannot accommodate the manufacturing tolerances of the battery pack 100's shell thickness, affecting deformation suppression. In this case, however, the rotating threaded self-locking component 5 can simultaneously complete the locking of the connecting unit 4 and the fine-tuning of the clamping component 3's position, simplifying the operation. Manual operation requires no tools, improving production line changeover efficiency. The adjustable stroke of the clamping component 3 along the thickness direction adapts to different battery pack 100 shell thickness tolerances, ensuring that the protective fixture always fits tightly against the edge of the battery pack 100, preventing constraint failure due to gaps during inflation testing. The threaded self-locking component 5 maintains locking force even under vibration, preventing displacement of the clamping mechanism during testing.

[0047] Please see Figure 1 , Figures 7 to 8 As an optional embodiment of this utility model, a locking unit 6 is provided between the connecting unit 4 and the clamping member 3, and the locking unit 6 is used to lock the clamping member 3 in the released and / or clamped state.

[0048] It should be noted that the locking unit 6 can be a mechanical buckle, a magnetic component, or a flexible pin. Its function is to prevent the clamping member 3 from accidentally rotating and damaging the battery pack 100. For example, during the process of installing the battery pack airtightness testing protective fixture onto the battery pack 100, if the clamping member 3 suddenly rotates and scratches the surface of the battery pack 100, the locking unit 6 can lock the current state of the clamping member 3 to avoid the problem of the clamping member 3 damaging the battery pack 100.

[0049] As an optional embodiment of this utility model, the locking unit 6 is, for example, a screw. When the screw connects the connecting unit 4 and the clamping member 3, it can lock the clamping member 3 in a released or clamped state.

[0050] Please see Figure 1 , Figures 7 to 8 As an optional embodiment of this utility model, the locking unit 6 includes a locking hook 61 and a limiting member 62; the locking hook 61 is disposed on the clamping member 3; the limiting member 62 is disposed on the connecting unit 4 and cooperates with the locking hook 61 to lock the position of the clamping member 3 when the clamping member 3 is in the released state, so as to prevent the clamping member 3 from swinging.

[0051] It should be noted that the locking hook 61 is integrally formed with the clamping member 3 or is connected separately. Its structural form can be an L-shaped hook (right-angle hook), a barbed hook (one-way anti-detachment), or a hook with a bevel (guide engagement). The function of the locking hook 61 is to form a mechanical interlock with the limiting member 62. The limiting member 62 is fixedly or adjustablely installed on the connecting unit 4 and physically cooperates with the locking hook 61. When the clamping member 3 is in the released state (i.e., non-working position), the locking hook 61 engages with the limiting member 62, restricting the swing of the clamping member 3 around the hinge axis, preventing the clamping member 3 from falling and swinging and damaging the battery pack 100 due to external vibration, collision, gravity, or inertia, and avoiding the random swinging of the unlocked clamping member 3 during manual handling, which would interfere with the operation process and pose a risk of bumping during handling.

[0052] Please see Figure 1 , Figures 7 to 8 As an optional embodiment of the present utility model, the connecting unit 4 includes a downwardly extending connecting plate 41, the connecting plate 41 is provided with a locking through hole 411, and the locking through hole 411 is provided with first holes on both sides.

[0053] The limiting member 62 is a limiting ball 621 or an elastic protrusion, the elastic protrusion being made of an elastic material, such as rubber. When the limiting member 62 is a limiting ball 621, the limiting ball 621 is movably limited within the first hole. The locking hook 61 has a locking part 611 at one end away from the clamping member 3. After the locking hook 61 extends into the locking through hole 411, the locking part 611 is adapted to limit the limiting member 62. The limiting member 62 is configured such that when the clamping member 3 is driven to rotate, and the rotational driving force that causes the locking hook 61 to disengage from the locking through hole 411 is greater than a preset threshold, the locking part 611 disengages from the limiting member 62.

[0054] It should be noted that the preset threshold, for example, exceeds 1.5 times the weight of the clamping component 3, to ensure that manual unlocking is possible and that locking remains in a vibration environment. The connecting plate 41 is a plate-like structure extending downward from the connecting unit 4, and is provided with a locking through hole 411 and first holes symmetrically distributed on both sides of the through hole. The connecting plate 41 can be a metal stamping part, a casting part, or an engineering plastic part. The limiting component 62 is a limiting ball 621, which is movably embedded in the first hole and can be a steel ball, a ceramic ball, or a polymer sphere. The limiting ball 621 partially protrudes from the surface of the first hole, forming a limiting protrusion. The engaging part 611 of the locking hook 61 is a groove, a tapered flare, or an annular groove provided at the end of the locking hook 61, which is adapted to the shape of the protruding part of the limiting ball 621. When the locking hook 61 extends into the locking through hole 411, the engaging part 611 and the limiting ball 621 engage to form a three-dimensional constraint. When the driving force of the rotating clamping member 3 exceeds the preset threshold (such as manual operation force), the inclined surface of the engaging part 611 presses against the limiting ball 621, causing the limiting ball 621 to retract radially into the first hole, thus releasing the lock. When the engaging part 611 moves to the corresponding position of the limiting ball 621, the limiting ball 621 resets under the action of elasticity or gravity, embedding into the groove of the engaging part 611 to form a mechanical interlock. The force of the preset threshold is generally a force that is easy to operate manually, but it is generally enough to keep the holding block locked under the action of gravity, vibration, etc. The guiding design of the limiting ball 621 and the inclined surface of the engaging part 611 in this case allows the locking to be automatically triggered during the insertion of the locking hook 61 into the locking through hole 411 without manual intervention; the limiting ball 621 is triggered to disengage simultaneously when the clamping member 3 is rotated, realizing the synchronous completion of the locking release and clamping action; the two limiting balls 621 are symmetrically distributed on both sides of the locking through hole 411 to resist vibration and impact in any direction.

[0055] Please see Figure 8 As an optional embodiment of this utility model, a stud 622 is provided in the first hole, one end of the stud 622 is threadedly connected to the first hole, the limiting ball 621 is movably embedded in the other end of the stud 622, and at least a portion of the surface of the limiting ball 621 is exposed outside the stud 622.

[0056] It should be noted that rotating the stud 622 changes its screw-in depth, thereby adjusting the height of the limiting ball 621 protruding from the surface of the first hole. The protrusion height of the limiting ball 621 directly determines the threshold force for the engaging part 611 to disengage, adapting to the locking requirements of clamping parts 3 of different weights. The floating space of the limiting ball 621 within the cavity of the stud 622 allows for radial micro-movement, compensating for the assembly tolerance between the locking hook 61 and the locking through hole 411. When the limiting ball 621 is compressed and retracts, it rolls along the inclined surface, reducing wear on the engaging part 611. Since the fixed limiting component 62 cannot adapt to the weight differences of different clamping components 3, it may result in insufficient locking or excessive operating resistance. However, this invention can change the protrusion height of the limiting ball 621 by turning the stud 622, thereby adjusting the operating torque for disengaging the lock and adapting to the full range of needs from light to heavy-duty battery packs 100. This invention reduces the frictional wear of the locking hook 611 by using the rolling contact design of the limiting ball 621, thus extending the life of key components. The floating design of the limiting ball 621 compensates for the cumulative manufacturing tolerances of the connecting plate 41 and the locking hook 61, ensuring consistent locking reliability of the tooling in mass production.

[0057] Please see Figure 1 As an optional embodiment of this utility model, the frame unit 1 is provided with a plurality of lifting rings 7, and the position of the lifting rings 7 on the frame unit 1 is adjustable.

[0058] It should be noted that fixing the position of the lifting ring 7 causes the center of gravity to shift when lifting large tooling, which may lead to swaying or even falling risks. In this case, the position of the lifting ring 7 is adjusted so that the line connecting the lifting points coincides with the vertical line of the tooling's center of gravity, avoiding tilting during lifting. Moving the position of the lifting ring 7 can accommodate the center of gravity shift of battery pack airtightness testing protective tooling with different structures, ensuring lifting stability and improving handling safety.

[0059] As an optional embodiment of the present invention, the frame unit 1 includes a plurality of interconnected crossbeams 12 and longitudinal beams 13, and the protective plate 11 is fixed to the bottom of the crossbeams 12 and longitudinal beams 13.

[0060] It should be noted that the non-uniform frame structure causes local stress concentration in the protective plate 11, reducing the deformation suppression effect. In this case, the cross beams 13 intersect to form a high-rigidity grid to resist the bending stress during the inflation test. The protective plate 11 completely covers the bottom of the frame, ensuring that each area of ​​the battery pack 100 cover 101 is evenly compressed.

[0061] Please see Figure 1 As an optional embodiment of this utility model, the crossbeam 12 and the longitudinal beam 13 are connected by bolts and angle steel 14, so that the crossbeam 12 and the longitudinal beam 13 are vertically connected.

[0062] Please see Figure 3As an optional embodiment of the present invention, it further includes a positioning unit 2 disposed on the frame unit 1, the positioning unit 2 being used to be adapted and positioned to fit the positioning hole 102 on the edge of the battery pack 100.

[0063] Please see Figure 1 As an optional embodiment of this utility model, the positioning unit 2 is positioned adjustablely on the frame unit 1 to adapt to the positioning of different battery packs 100.

[0064] It should be noted that the installation of the battery pack airtightness testing protective fixture relies on repeated manual adjustments to its position, affecting the consistency of the testing cycle. In this case, the positioning unit 2 is adjustablely installed on the frame unit 1 via a slide rail, slot, or connecting hole to adapt to the lifting holes or positioning features of different battery pack models 100. For a specific battery pack model 100, the corresponding battery pack airtightness testing protective fixture only needs to be adjusted once to meet the testing requirements of that battery pack 100. For example, the positioning unit 2 can be a positioning pin 21, a guide post, or an alignment block, and its position on the frame unit 1 can be adjusted by bolt tightening, slider locking, or elastic buckle. The adjustable position of the positioning unit 2 accurately matches the positioning hole 102 position of different battery packs 100, significantly reducing the risk of positioning failure caused by model differences. In addition, the adjustable positioning unit 2 can be inserted and cooperate with the positioning hole 102 of the battery pack 100 to achieve rapid hard positioning, reduce manual adjustment time, and improve testing efficiency.

[0065] Please see Figure 1 As an optional embodiment of this utility model, the positioning unit 2 is a positioning pin 21, which is used to fit and position itself in the positioning hole 102 on the edge of the battery pack 100. The positioning pin 21 can be a cylindrical pin, a tapered pin, or a stepped pin, which is inserted into the positioning hole 102 (lifting hole, process hole) on the edge of the battery pack 100. The positioning pin 21 is inserted into the positioning hole 102 of the battery pack 100 to achieve axial constraint and eliminate horizontal displacement.

[0066] As an optional embodiment of this utility model, the threaded self-locking member 5 is a spur bolt. The wing-shaped head of the spur bolt of the threaded self-locking member 5 provides a manual tightening operation surface. After passing through the connecting unit 4, the threaded self-locking member 5 cooperates with the frame unit 1. Rotating the wing-shaped head drives the bolt to move axially, thereby realizing the locking of the connecting unit 4 and the fine adjustment of the position of the clamping member 3.

[0067] In use, the first step is to use a crane to move the battery pack airtightness testing protective fixture directly above the battery pack 100 when the battery pack 100 needs to undergo a full-pack airtightness test. The positioning pins 21 are aligned with the positioning holes 102 around the battery pack 100 and then lowered to the bottom. The second step involves releasing the four clamping mechanisms installed on the battery pack airtightness testing protective fixture. Figure 5 and Figure 8 As shown, the locking hook 61 on the clamping mechanism is engaged between the two limiting balls 621 to prevent the clamping parts 3 from falling and damaging the appearance of the battery pack 100; in the third step, after the four clamping parts 3 move from the released state to the clamped state, the clamping parts 3 are engaged on the edge of the bottom shell of the battery pack 100, as shown. Figure 3 As shown, some clamping mechanisms are already in the clamping state; at this time, a certain amount of gas is injected into the battery pack 100, and the expansion inside the battery pack 100 will cause the top cover 101 of the battery pack 100 to bulge; however, the cooperation of the protective plate 11 and the clamping parts 3 of the battery pack airtightness testing protective fixture will prevent the top cover 101 of the battery pack 100 from bulging and deforming; in the fourth step, after the airtightness test is completed, as Figure 5 As shown, rotate the four clamping parts 3 and lock the hook 61 into the middle of the limiting ball 621 to complete this airtightness test; the fifth step, as shown... Figure 3 As shown, a crane is used to move the protective fixture for testing the airtightness of the battery pack to another battery pack 100 to be tested for airtightness to perform the above-mentioned operations.

[0068] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A battery pack air tightness detection protection tool, characterized in that, include: The frame unit includes a protective plate for fitting against the top cover surface of the battery pack; A clamping mechanism is provided at least on both sides of the frame unit, and the clamping mechanism includes: The connecting unit is positioned adjustablely within the frame unit to accommodate clamping and mounting of different battery pack models. A clamping element, hinged to the connecting unit, is configured to clamp or release the lower edge of the battery pack by rotation.

2. The battery pack air tightness detection guard tool according to claim 1, wherein, The upper or lower part of the connecting unit is provided with a threaded self-locking component; The threaded self-locking member is used to move along a first direction to lock the connecting unit to the frame unit, and the clamping member follows the connecting unit to move in the first direction to fit against or move away from the edge of the battery pack, wherein the first direction is the thickness direction of the battery pack.

3. The battery pack air tightness detection guard tool according to claim 1, wherein, A locking unit is provided between the connecting unit and the clamping member, the locking unit being used to lock the clamping member in a released and / or clamped state.

4. The battery pack air tightness detection guard tool of claim 3, wherein, The locking unit includes: A locking hook is provided on the clamping member; A limiting member is provided on the connecting unit and cooperates with the locking hook to lock the position of the clamping member when the clamping member is in the released state.

5. The battery pack air tightness detection guard tool of claim 4, wherein, The connecting unit includes a downwardly extending connecting plate, the connecting plate being provided with a locking through hole, and first holes being provided on both sides of the locking through hole; The limiting member is a limiting ball or an elastic protrusion. The limiting member is located in the first hole. The end of the locking hook away from the clamping member is provided with an engaging part. After the locking hook extends into the locking through hole, the engaging part is adapted to limit the locking member. The limiting member is configured such that when the clamping member is driven to rotate, and the rotational driving force that causes the locking hook to disengage from the locking through hole is greater than a preset threshold, the engaging part disengages from the limiting member.

6. The protective fixture for testing the airtightness of a battery pack according to claim 5, characterized in that, A stud is provided in the first hole, one end of the stud is threaded to the first hole, and a limiting ball is movably embedded in the other end of the stud, with at least a portion of the surface of the limiting ball exposed outside the stud.

7. The battery pack air tightness detection guard tool of claim 1, wherein, The frame unit is equipped with multiple lifting rings.

8. The battery pack air tightness detection guard tool of claim 1, wherein, The frame unit includes multiple interconnected crossbeams and longitudinal beams, and the protective plate is fixed to the bottom of the crossbeams and longitudinal beams.

9. The battery pack air tightness detection guard tool of claim 1, wherein, It also includes a positioning unit disposed on the frame unit, the positioning unit being used to be positioned in conjunction with a positioning hole on the edge of the battery pack.

10. The battery pack air tightness detection guard tool of claim 2, wherein, The threaded self-locking component is a screw bolt.

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