Battery pack air tightness detection tool

Abstract

The utility model provides a battery pack air tightness detection tool, which comprises a base and a pressing assembly arranged above the base, an accommodating space for accommodating a battery pack is formed between the base and the pressing assembly, the pressing assembly comprises a support frame arranged on the base in an up-and-down sliding manner, and the support frame is arranged on the base in an up-and-down sliding manner. The supporting frame is arranged on the base, the mounting plates are arranged on the supporting frame and arranged in the length direction of the base at intervals, each mounting plate is in threaded connection with a plurality of screw rods, the screw rods on each mounting plate are arranged in the width direction of the base at intervals, and one end of each screw rod extends into the containing space and can press the top of the battery pack. The battery pack air tightness detection tool is simple in design structure and can adapt to battery packs of different sizes, and a detection tool does not need to be independently designed for each type of battery pack.

Description

Battery pack airtightness testing fixture Technical Field

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

[0002] With the setting of emission reduction targets globally and in various regions, the new energy vehicle market is showing a rapid growth trend, and the safety of new energy vehicles is also attracting increasing attention from consumers. As the core component of new energy vehicles, the battery pack receives the most attention, and airtightness testing of the battery pack is an essential step in the production process.

[0003] When performing airtightness testing on a battery pack, it is necessary to inflate the inside of the battery pack and observe the pressure difference change. To avoid excessive internal pressure that could cause deformation of the battery pack, the testing fixtures in the existing technology usually press the battery pack tightly.

[0004] However, the existing testing fixtures are relatively complex, which increases the difficulty of processing and installation. Furthermore, when conducting airtightness testing on battery packs of different sizes, it is necessary to design separate testing fixtures for each battery pack, which is not conducive to improving the applicability of the testing fixtures. Summary of the Invention

[0005] In view of this, the present invention aims to provide a battery pack airtightness testing fixture, which has a simple design structure and is conducive to improving the applicability of the testing fixture.

[0006] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0007] A battery pack airtightness testing fixture includes a base and a pressing component disposed above the base, wherein an accommodating space for accommodating the battery pack is formed between the base and the pressing component.

[0008] The pressing assembly includes a support frame that slides up and down on the base, and a plurality of mounting plates on the support frame, wherein the plurality of mounting plates are arranged at intervals along the length direction of the base;

[0009] Each mounting plate is screwed with a plurality of screws, and the plurality of screws on each mounting plate are arranged at intervals along the width direction of the base; one end of each screw extends into the accommodating space and can press the top of the battery pack.

[0010] Furthermore, each of the mounting plates is provided with a plurality of sleeves with threaded holes, and each sleeve on the mounting plate corresponds to a screw, and the screw is screwed into the threaded hole on the corresponding sleeve.

[0011] Furthermore, each of the screws is provided with a vibration damping pad at one end of the accommodating space, and each screw abuts against the battery pack through the vibration damping pad on its own.

[0012] Furthermore, the base is provided with multiple columns, which are arranged at intervals around the edge of the base; multiple first guide structures are provided between the base and the support frame, and each of the multiple first guide structures corresponds to one of the columns; each first guide structure includes a first guide groove provided in the corresponding column and a guide post provided on the support frame, the guide post being inserted into the first guide groove, which can guide the support frame to slide up and down on the base.

[0013] Furthermore, a plurality of transmission structures are provided between the base and the support frame; the plurality of transmission structures correspond one-to-one with the plurality of first guide structures, and each transmission structure includes a gear rotatably disposed relative to the base and a rack disposed on the support frame, wherein the gear and the rack are meshed and connected.

[0014] Furthermore, the rack and the guide post are integrated into one unit, and the gear is rotatably mounted on the column corresponding to the first guide groove.

[0015] Furthermore, it also includes locking components corresponding to each of the gears. Each locking component includes a locking member pivotally connected to the column and an elastic member disposed on the column. The gear and the elastic member are respectively disposed on both sides of the locking member. When the gear rotates in the forward direction, the locking member can compress the elastic member to store energy. When the elastic member releases energy, one end of the locking member can be engaged in any tooth groove of the gear to prevent the gear from rotating in the reverse direction.

[0016] Furthermore, each of the columns is provided with an unlocking component, the unlocking component including an unlocking rod screwed onto the column, and the unlocking rod having an extension section extending out of the column; the elastic element includes a spring disposed in the first guide groove, one end of the spring being disposed on the unlocking rod, and the other end being connected to the locking element.

[0017] Furthermore, the unlocking assembly also includes a screw connector screwed to the unlocking rod, one end of the spring being connected to the screw connector and disposed on the unlocking rod; a second guide structure is provided between the screw connector and the post, the second guide structure including a second guide groove disposed on one of the screw connector and the post, and a guide block disposed on the other, the guide block being embedded in the second guide groove, capable of guiding the screw connector to slide along the axial direction of the unlocking rod.

[0018] Furthermore, each of the columns can be detachably connected to the base.

[0019] Compared with the prior art, this utility model has the following advantages:

[0020] The battery pack airtightness testing fixture of this utility model, through the arrangement of a support frame, mounting plates, and screws on each mounting plate in the pressing assembly, and the support frame sliding up and down on the base, can adapt to battery packs of different heights. At the same time, with the cooperation of multiple screws, it can press battery packs of different lengths and widths. As such, the structure is simple, easy to process and install, and there is no need to design separate testing fixtures for battery packs of different sizes, which helps to improve the applicability of the testing fixture.

[0021] Secondly, the use of sleeves that correspond one-to-one with the screws allows for flexible tightening of the appropriate number of screws to secure the battery packs of different sizes. Furthermore, the standardized design of the sleeves and screws reduces manufacturing costs and simplifies the processing and installation process, facilitating mass production. The inclusion of vibration-damping pads ensures tight contact between the screws and the battery pack, enhancing the reliability of the battery pack's fixation and preventing scratches or abrasions to the battery pack's surface during screw tightening.

[0022] By arranging multiple columns around the edge of the base, even support points are formed, which helps to distribute the weight of the support frame, enhances the stability of the overall structure, and prevents deformation or damage caused by uneven stress. Meanwhile, the first guide structure, composed of a first guide groove and guide columns, provides precise guidance as the support frame slides up and down, preventing deviation or tilting during movement and improving stability and reliability.

[0023] By designing the transmission structure, the support frame can slide up and down more smoothly, which helps to improve the smoothness of the support frame's movement. Furthermore, by corresponding multiple transmission structures with multiple first guide structures one by one, the synchronization of each part of the support frame during up and down sliding can be ensured, which can improve the coordination of the support frame during sliding. In addition, the transmission structure is composed of gears and racks, which is simple in structure, easy to install and maintain, and its high durability reduces the frequency and cost of maintenance.

[0024] Furthermore, integrating the rack and guide post into one unit tightly combines guiding and transmission functions, ensuring the accuracy of the support frame during vertical sliding. This also reduces the number of parts, simplifies the overall structure, and allows for full utilization of the column space, eliminating the need for additional mounting brackets and further optimizing the structural layout. The locking assembly ensures unimpeded forward rotation of the gear and rapid locking when it rotates in the reverse direction, preventing reverse rotation and improving the stability of the support frame. The locking assembly consists of a locking element and a spring element, allowing the locking element to automatically reset under the action of the spring element, automatically entering the locking state when the gear rotates in the reverse direction without additional operation.

[0025] By using the unlocking lever in the unlocking assembly, and the spring connected at one end to the unlocking lever and at the other end to the locking member, the movement of the unlocking lever can be controlled by the extension section, and the movement of the unlocking lever is directly applied to the locking member by the spring. When the extension section is operated to move the unlocking lever, the locking member moves away from the gear, so that the gear is not obstructed by the locking member when rotating in the opposite direction.

[0026] Furthermore, the screw-in connector converts the rotational motion of the unlocking rod into axial movement of the connector, facilitating the spring to pull the locking element away from the gear, releasing the gear and allowing the support frame to slide upwards. Simultaneously, the cooperation of the second guide groove and guide block in the second guide structure restricts the movement direction of the screw-in connector, preventing it from shifting during movement, thus improving structural reliability. The detachable mounting of the column on the base facilitates assembly between the column and base, saving time on column installation and disassembly. Furthermore, manufacturing the column and base separately simplifies the processing and reduces manufacturing costs. Attached Figure Description

[0027] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0028] Figure 1 is a schematic diagram of the overall structure of the battery pack airtightness testing fixture according to Embodiment 1 of this utility model;

[0029] Figure 2 is an enlarged view of the structure shown at point A in Figure 1;

[0030] Figure 3 is an enlarged view of the structure shown at point B in Figure 1;

[0031] Figure 4 is a structural schematic diagram of the column described in Embodiment 1 of this utility model;

[0032] Figure 5 is a structural schematic diagram of the locking component and unlocking component according to Embodiment 1 of this utility model;

[0033] Figure 6 is an enlarged view of the structure shown at point C in Figure 5;

[0034] Figure 7 is a schematic diagram of the connection between the unlocking rod and the screw connector according to Embodiment 1 of this utility model;

[0035] Explanation of reference numerals in the attached figures:

[0036] 1. Base; 11. Column; 111. Threaded section;

[0037] 2. Pressing assembly; 21. Support frame; 211. Handle; 22. Mounting plate; 221. Screw; 2211. Vibration damping pad; 222. Sleeve; 2221. Threaded hole;

[0038] 3. Storage space; 31. Battery pack;

[0039] 4. First guide structure; 41. First guide groove; 42. Guide post;

[0040] 5. Transmission structure; 51. Gear; 52. Rack;

[0041] 6. Locking assembly; 61. Locking element; 611. Rotating shaft; 62. Elastic element; 621. Spring;

[0042] 7. Unlocking component; 71. Unlocking lever; 711. Extension section; 72. Screw connector;

[0043] 8. Second guide structure; 81. Second guide groove; 82. Guide block. Detailed Implementation

[0044] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0045] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," and "back," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0046] Taking the battery pack airtightness testing fixture described in this utility model as an example, the directional terms used in the embodiments, such as "up, down, left, right, front, and back", are defined based on the up-down direction (also known as the height direction), the left-right direction (also known as the length direction), and the front-back direction (also known as the width direction) as shown in Figure 1.

[0047] Furthermore, in the description of this utility model, unless otherwise explicitly defined, the terms "installation," "connection," "joining," and "connector" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model in light of the specific circumstances.

[0048] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0049] Example 1

[0050] This embodiment relates to a battery pack airtightness testing fixture, which has a simple design and can adapt to battery packs of different sizes, thereby improving the applicability of the testing fixture.

[0051] In terms of overall structure, as shown in Figures 1 to 7, the battery pack airtightness testing fixture of this embodiment includes a base 1 and a pressing component 2 disposed above the base 1. An accommodating space 3 for accommodating the battery pack 31 is formed between the base 1 and the pressing component 2.

[0052] The pressing assembly 2 includes a support frame 21 that slides vertically on the base 1, and multiple mounting plates 22 mounted on the support frame 21. The mounting plates 22 are spaced apart along the length of the base 1. Each mounting plate 22 is screwed with multiple screws 221, and the screws 221 on each mounting plate 22 are spaced apart along the width of the base 1. One end of each screw 221 extends into the receiving space 3 and can press the top of the battery pack 31.

[0053] At this time, with the above configuration, the support frame 21 in the pressing component 2, each mounting plate 22, and the screws 221 on each mounting plate 22 are arranged, and the support frame 21 slides up and down on the base 1, which can accommodate battery packs 31 of different heights. At the same time, with the cooperation of multiple screws 221, battery packs 31 of different lengths and widths are pressed together. This configuration is simple in structure, easy to process and install, and eliminates the need to design separate testing fixtures for battery packs 31 of different sizes, which helps to improve the applicability of testing fixtures.

[0054] In the specific structure, the support frame 21 in this embodiment consists of two long strips arranged at intervals along the length and width of the base 1. Each long strip is provided with a handle 211, and the two ends of each mounting plate 22 are respectively fixed to the two long strips.

[0055] In practice, the battery pack 31 is placed in the accommodating space 3, and the handle 211 is operated to make the support frame 21 slide down, so that the screws 221 on each mounting plate 22 contact the battery pack 31. According to the length and width of the battery pack 31, the corresponding number of screws 221 are turned down to press the battery pack 31. Then, air is injected into the battery pack 31 and the pressure difference is observed.

[0056] It should be noted that the number of mounting plates 22 in this embodiment is five. Of course, the specific number of mounting plates 22 can also be designed and adjusted according to actual needs, such as four, six or seven. At the same time, the number of screws 221 on each mounting plate 22 can be nine, and their number can also be designed and adjusted according to actual needs, such as eight or ten.

[0057] Based on the above overall introduction, in this embodiment, as a preferred implementation, referring to Figures 1 and 2, each mounting plate 22 is provided with a plurality of sleeves 222 having threaded holes 2221. Each sleeve 222 on the mounting plate 22 corresponds to a screw 221, and the screw 221 is screwed into the threaded hole 2221 on the corresponding sleeve 222.

[0058] Here, by setting up sleeves 222 that correspond one-to-one with screws 221, the corresponding number of screws 221 can be flexibly screwed to press the battery pack 31 according to different sizes of battery pack 31. Furthermore, the standardized design of sleeves 222 and screws 221 helps to reduce manufacturing costs and simplifies the processing and installation process, thereby facilitating mass production.

[0059] Furthermore, in this embodiment, as a preferred implementation, as shown in FIG2, each screw 221 is provided with a vibration damping pad 2211 at one end of the accommodating space 3, and each screw 221 abuts against the battery pack 31 through its own vibration damping pad 2211.

[0060] The advantage of this design is that the damping pad 2211 ensures close contact between the screw 221 and the battery pack 31, enhancing the fixation reliability of the battery pack 31. At the same time, it can also prevent the surface of the battery pack 31 from being scratched or worn when the screw 221 presses against the battery pack 31.

[0061] In practice, according to the length and width of the battery pack 31, the corresponding number of screws 221 are screwed to rotate in the threaded hole 2221 of the sleeve 222, so as to move downward and make the vibration damping pad 2211 on the screw 221 press against the battery pack 31 to ensure the stability of the battery pack 31.

[0062] It should be noted that the vibration damping pad 2211 in this embodiment can be made using vibration damping materials well known to those skilled in the art, such as rubber or polyurethane.

[0063] Furthermore, in this embodiment, as a preferred implementation, as shown in Figures 1 and 3, the base 1 is provided with a plurality of columns 11, which are arranged around the edge of the base 1 at intervals. A plurality of first guide structures 4 are provided between the base 1 and the support frame 21, and each of the first guide structures 4 corresponds one-to-one with a column 11.

[0064] Here, multiple columns 11 are spaced around the edge of the base 1 to form uniform support points, which helps to distribute the weight of the support frame 21, enhance the stability of the overall structure, and prevent deformation or damage caused by uneven stress.

[0065] Meanwhile, each of the first guide structures 4 includes a first guide groove 41 provided in the corresponding column 11 and a guide post 42 provided on the support frame 21. The guide post 42 is inserted into the first guide groove 41 and can guide the support frame 21 to slide up and down on the base 1.

[0066] It is understood that the first guide structure 4 consists of a first guide groove 41 and a guide post 42. This configuration enables precise guidance when the support frame 21 slides up and down, preventing the support frame 21 from shifting or tilting during movement, and improving the stability and reliability of the movement.

[0067] It should be noted that in this embodiment, there are four columns 11, which are respectively arranged at the four top corners of the base 1. Of course, in addition to setting four columns 11, the specific number can also be designed and adjusted according to actual needs, such as six or eight.

[0068] It is worth mentioning that the upper half of the column 11 is a rectangular structure and the lower half of the column 11 is a cylindrical structure. In the specific structure, the first guide groove 41 is set in the upper half of the column 11. In specific implementation, the support frame 21 is moved downward by operating the handle 211, so that each guide column 42 is inserted into the corresponding first guide groove 41 to guide the sliding of the support frame 21.

[0069] Meanwhile, in this embodiment, as a preferred implementation, as shown in Figures 3 and 5, multiple transmission structures 5 are provided between the base 1 and the support frame 21. Each of the multiple transmission structures 5 corresponds one-to-one with a multiple first guide structure 4. Each transmission structure 5 includes a gear 51 rotatably disposed relative to the base 1 and a rack 52 disposed on the support frame 21, with the gear 51 and rack 52 meshing together.

[0070] Therefore, the transmission structure 5 ensures smoother up-and-down sliding of the support frame 21, improving the fluidity of its movement. Furthermore, the one-to-one correspondence between multiple transmission structures 5 and multiple first guide structures 4 ensures the synchronization of all parts of the support frame 21 during up-and-down sliding, enhancing its coordination. The transmission structure 5, composed of gears 51 and racks 52, is simple in structure, easy to install and maintain, and its high durability reduces maintenance frequency and cost. In practical implementation, when the support frame 21 slides downwards, the rack 52 meshes with the gear 51, ensuring the smoothness of the support frame 21's sliding.

[0071] Specifically, in this embodiment, as a preferred implementation, as shown in FIG5, the corresponding rack 52 and guide post 42 are integrated into one piece, and the gear 51 is rotatably mounted on the column 11 corresponding to the first guide groove 41.

[0072] Here, the rack 52 and the guide post 42 are integrated into one unit, which can tightly combine the guiding and transmission functions, ensuring the accuracy of the support frame 21 when sliding up and down. At the same time, it can also reduce the number of parts, simplify the overall structure, and set the gear 51 on the column 11, which can make full use of the space of the column 11, avoid additional mounting brackets, and further optimize the structural layout.

[0073] In the specific structure, the gear 51 is rotatably disposed in the first guide groove 41. When the support frame 21 slides downward, the rack 52 is inserted into the first guide groove 41 and meshes with the gear 51, which can ensure the stable sliding of the support frame 21 and guide the sliding of the support frame 21.

[0074] In addition, as a preferred embodiment, as shown in FIG5, the battery pack airtightness testing fixture of this embodiment also includes a locking component 6 corresponding to each gear 51. Each locking component 6 includes a locking member 61 pivotally connected to the column 11 and an elastic member 62 provided on the column 11.

[0075] In this configuration, gear 51 and elastic element 62 are respectively placed on both sides of locking element 61. When gear 51 rotates in the forward direction, locking element 61 can compress elastic element 62 to store energy, and elastic element 62 releases energy, so that one end of locking element 61 can be locked in any tooth groove of gear 51 to prevent gear 51 from rotating in the reverse direction.

[0076] Therefore, by setting the locking component 6, the gear 51 is not obstructed when rotating in the forward direction, and is quickly locked when rotating in the reverse direction to prevent the gear 51 from rotating in the reverse direction, thereby improving the stability of the support frame 21. Furthermore, the locking component 6 consists of a locking element 61 and an elastic element 62, which allows the locking element 61 to automatically reset under the action of the elastic element 62, automatically entering the locked state when the gear 51 rotates in the reverse direction, without requiring additional operation.

[0077] It should be noted that the elastic element 62 in this embodiment can be an elastic product well known to those skilled in the art, such as a spring or spring sheet.

[0078] In the specific structure, a rotating shaft 611 is provided in the first guide groove 41, and the locking member 61 rotates on the rotating shaft 611. The two ends of the elastic member 62 are respectively connected to the locking member 61 and the first guide groove 41. When the support frame 21 slides downward, the rack 52 meshes with the gear 51, causing the gear 51 to rotate in the forward direction (i.e., in the counterclockwise direction) and come into contact with the locking member 61, compressing the elastic member 62. Secondly, when the gear 51 tends to rotate in the reverse direction, the locking member 61 can be locked in the tooth groove of the gear 51 under the pushing action of the elastic member 62, preventing the gear 51 from rotating in the reverse direction, thereby limiting the upward sliding of the rack 52 and ensuring the stability of the support frame 21.

[0079] Furthermore, in this embodiment, as a preferred implementation, referring to Figure 5, each column 11 is provided with an unlocking component 7. The unlocking component 7 includes an unlocking rod 71 screwed onto the column 11, and the unlocking rod 71 has an extension section 711 extending outside the column 11. The elastic member 62 includes a spring 621 disposed in the first guide groove 41, one end of the spring 621 is disposed on the unlocking rod 71, and the other end is connected to the locking member 61.

[0080] Here, by setting up the unlocking rod 71 in the unlocking assembly 7, and the spring 621 with one end connected to the unlocking rod 71 and the other end connected to the locking member 61, the movement of the unlocking rod 71 can be controlled by the extension section 711, and the movement of the unlocking rod 71 can be directly applied to the locking member 61 by the spring 621. When the extension section 711 is operated to drive the unlocking rod 71 to move, the locking member 61 moves away from the gear 51, so that the gear 51 is not obstructed by the locking member 61 when it rotates in the opposite direction.

[0081] After the battery pack 31 is inspected and needs to be removed, the support frame 21 is slid upwards. At this time, by rotating the extension section 711, the unlocking rod 71 screwed onto the column 11 moves outwards along its own axis. This allows the locking member 61 to rotate around the pivot 611 and move away from the gear 51 by pulling the spring 621. As a result, the gear 51 is no longer locked by the locking member 61 and can rotate in the opposite direction, allowing the rack 52 to move upwards, thus enabling the support frame 21 to slide upwards.

[0082] Meanwhile, in this embodiment, as a preferred implementation, as shown in Figures 5 and 7, the unlocking component 7 further includes a screw connector 72 that is screwed to the unlocking rod 71, and one end of the spring 621 is connected to the screw connector 72 and disposed on the unlocking rod 71.

[0083] Furthermore, a second guide structure 8 is provided between the screw connector 72 and the post 11. The second guide structure 8 includes a second guide groove 81 provided on one of the screw connector 72 and the post 11, and a guide block 82 provided on the other. The guide block 82 is embedded in the second guide groove 81 and can guide the screw connector 72 to slide along the axial direction of the unlocking rod 71.

[0084] Therefore, the screw connector 72 converts the rotational motion of the unlocking rod 71 into the axial movement of the screw connector 72, which facilitates the spring 621 to pull the locking member 61 away from the gear 51, releasing the lock on the gear 51 and allowing the support frame 21 to slide upward. Simultaneously, the cooperation between the second guide groove 81 and the guide block in the second guide structure 8 restricts the direction of movement of the screw connector 72, preventing it from deviating during movement, thereby improving the reliability of the structure.

[0085] It should be noted that in this embodiment, both the gear 51 and the locking member 61 are rotatably disposed in the first guide groove 41 inside the column 11. At the same time, the unlocking rod 71 is also screwed onto the side wall of the upper half of the column 11, with one end extending into the first guide groove 41 and screwed onto the screw member 72.

[0086] In the specific structure, the guide block 82 extends axially along the unlocking rod 71 and is arranged in the first guide groove 41. Meanwhile, the second guide groove 81 is formed on the screw connector 72 and extends axially along the unlocking rod 71. Of course, in other embodiments, the second guide groove 81 can be disposed in the first guide groove 41, and the guide block 82 can be disposed on the screw connector 72.

[0087] In practice, the operation extension section 711 causes the unlocking rod 71 to rotate relative to the screw connector 72. At this time, the screw connector 72 moves along the axial direction of the unlocking rod 71 under the action of the guide block 82 and the second guide groove 81, and pulls the spring 621. In turn, the spring 621 pulls the locking member 61 to release the lock on the gear 51.

[0088] In addition, in this embodiment, as a preferred implementation, as shown in FIG4, each column 11 can be detachably connected to the base 1.

[0089] The advantage of this design is that the column 11 is detachably mounted on the base 1, making the assembly between the column 11 and the base 1 more convenient and saving time in installing and disassembling the column 11. At the same time, manufacturing the column 11 and the base 1 separately simplifies the processing technology and reduces manufacturing costs.

[0090] In the specific structure, each column 11 has a threaded section 111 at the end near the base 1, and each column 11 is screwed onto the base 1 through the threaded section 111. Of course, in addition to screwing, other common detachable connection methods, such as snap-fit, can also be used to connect the column 11 and the base 1.

[0091] In this embodiment, the battery pack airtightness testing fixture can be adjusted according to the actual height of the battery pack 31 by meshing the gear 51 and rack 52, so that the damping pads 2211 on each screw 221 abut against the battery pack 31. Next, based on the actual length and width dimensions of the battery pack 31, the corresponding screws 221 are rotated to press the battery pack 31 tightly, and then air is injected into the battery pack 31 to observe the pressure difference change. Therefore, compared to existing testing fixtures, the design structure is simple, and there is no need to design a separate testing fixture for each battery pack 31, improving the applicability of this testing fixture.

[0092] After the battery pack 31 is inspected, the corresponding screw 221 is rotated to release the pressure on the battery pack 31, and the extension section 711 is operated to rotate the unlocking rod 71. This causes the screwed member 72 to move axially along the unlocking rod 71, which in turn pulls the spring 621, causing the spring 621 to pull the locking member 61 away from the gear 51, thus releasing the lock on the gear 51. As a result, the support frame 21 can move upward via the rack 52, making it easier to remove the inspected battery pack 31.

[0093] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A tooling for testing the airtightness of a battery pack, characterized in that: The device includes a base and a pressing assembly disposed above the base, with an accommodating space for accommodating a battery pack formed between the base and the pressing assembly. The pressing assembly includes a support frame that slides vertically on the base and multiple mounting plates disposed on the support frame, the multiple mounting plates being spaced apart along the length direction of the base. Each mounting plate is screwed with multiple screws, and the multiple screws on each mounting plate are spaced apart along the width direction of the base. One end of each screw extends into the accommodating space and is capable of pressing the top of the battery pack.

2. The battery pack airtightness testing fixture according to claim 1, characterized in that: Each of the mounting plates is provided with a plurality of sleeves with threaded holes, and each sleeve on the mounting plate corresponds to a screw, and the screw is screwed into the threaded hole on the corresponding sleeve.

3. The battery pack airtightness testing fixture according to claim 1, characterized in that: Each screw has a vibration damping pad at one end located in the accommodating space, and each screw presses against the battery pack through the vibration damping pad on its own.

4. The battery pack airtightness testing fixture according to any one of claims 1-3, characterized in that: The base is provided with multiple columns, which are arranged at intervals around the edge of the base. Multiple first guide structures are provided between the base and the support frame, and each of the first guide structures corresponds to one of the columns. Each first guide structure includes a first guide groove provided in the corresponding column and a guide post provided on the support frame. The guide post is inserted into the first guide groove and can guide the support frame to slide up and down on the base.

5. The battery pack airtightness testing fixture according to claim 4, characterized in that: Multiple transmission structures are provided between the base and the support frame; each of the multiple transmission structures corresponds one-to-one with a multiple of the first guide structures, and each transmission structure includes a gear rotatably disposed relative to the base and a rack disposed on the support frame, wherein the gear and the rack are meshed and connected.

6. The battery pack airtightness testing fixture according to claim 5, characterized in that: The corresponding rack and the guide post are integrated into one piece, and the gear is rotatably mounted on the column corresponding to the first guide groove.

7. The battery pack airtightness testing fixture according to claim 6, characterized in that: It also includes locking components corresponding to each of the gears, each locking component including a locking member pivotally connected to the column and an elastic member disposed on the column; the gear and the elastic member are disposed on opposite sides of the locking member, the gear rotates in the forward direction, the locking member can compress the elastic member to store energy; the elastic member releases energy, and one end of the locking member can be engaged in any tooth groove of the gear to prevent the gear from rotating in the reverse direction.

8. The battery pack airtightness testing fixture according to claim 7, characterized in that: Each of the columns is provided with an unlocking component, the unlocking component including an unlocking rod screwed onto the column, and the unlocking rod having an extension section extending out of the column; the elastic element includes a spring disposed in the first guide groove, one end of the spring being disposed on the unlocking rod, and the other end being connected to the locking element.

9. The battery pack airtightness testing fixture according to claim 8, characterized in that: The unlocking assembly further includes a screw connector that is screwed to the unlocking rod. One end of the spring is connected to the screw connector and is disposed on the unlocking rod. A second guide structure is provided between the screw connector and the post. The second guide structure includes a second guide groove disposed on one of the screw connector and the post, and a guide block disposed on the other. The guide block is embedded in the second guide groove and can guide the screw connector to slide along the axial direction of the unlocking rod.

10. The battery pack airtightness testing fixture according to claim 4, characterized in that: Each of the columns can be detachably connected to the base.

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