Compression tool for air tightness test of battery pack
By combining a profile plate and a pressure sensor, the clamping fixture solves the problems of easy cracking of the cover plate and monitoring of clamping force in battery pack airtightness testing, achieving test consistency and safety, and reducing costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-11
- Publication Date
- 2026-04-14
Smart Images
Figure CN224122128U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of battery pack testing technology, specifically to a clamping fixture for battery pack airtightness testing. Background Technology
[0002] With the development of new energy industries such as electric vehicles and energy storage batteries, lithium battery packs have received widespread attention. Battery packs typically undergo performance testing before leaving the factory; only those that meet the test requirements can be used in various fields. Furthermore, due to the relatively high cost of battery packs, non-destructive testing is usually required to reduce testing costs. Air tightness testing is a crucial part of performance testing. This typically involves directly inflating the battery pack to a set pressure range and then judging its air tightness by the amount of air leakage. However, current battery pack covers, limited by their material and thickness, have poor toughness. This poses a risk of cover cracking during inflation testing. Therefore, a clamping device is needed. The commonly used clamping method is automatic clamping using cylinders, but these devices are expensive and space-consuming. Traditional manual clamping fixtures cannot effectively monitor the clamping force generated by the fixture, easily damaging the cover. Utility Model Content
[0003] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a clamping fixture for testing the airtightness of a battery pack. By setting a contour plate, the fit between the clamping fixture and the cover plate is improved, thereby enabling the clamping force of the clamping fixture to be distributed on the cover plate through the contour plate. By setting a pressure sensor and a pressure digital display, the pressure of the cover plate can be monitored, making it easy to judge whether the clamping force of the clamping fixture on the battery pack is appropriate based on the pressure value, and avoiding pressing the battery pack cover plate.
[0004] The purpose of this utility model is achieved through the following technical measures: a clamping fixture for testing the airtightness of a battery pack, comprising a rectangular frame, with one or more reinforcing rods inside the rectangular frame, each reinforcing rod corresponding to a contour plate, the contour plate being located below the rectangular frame, the reinforcing rods and the contour plate having mounting holes penetrating the reinforcing rods and the contour plate, a pressure sensor being installed in the mounting hole, the pressure sensor being used to detect the pressure of the battery pack cover plate, a pressure digital display head being installed above the mounting hole, the pressure digital display head being connected to the pressure sensor, and a locking mechanism being provided on the rectangular frame, the locking mechanism being used to lock the clamping fixture to the battery pack.
[0005] In some embodiments, at least one of the length and width of the rectangular frame matches the battery pack cover.
[0006] In some embodiments, when the length of the rectangular frame matches the length of the battery pack cover, the reinforcing rod is parallel to the width direction of the rectangular frame; when the width of the rectangular frame matches the width of the battery pack cover, the reinforcing rod is parallel to the length direction of the rectangular frame; when both the width and length of the rectangular frame match the battery pack cover, the reinforcing rod is parallel to either the length or width direction of the rectangular frame.
[0007] In some embodiments, when the length of the rectangular frame matches the length of the battery pack cover, the length of the contour plate matches the width of the battery pack cover; when the width of the rectangular frame matches the width of the battery pack cover, the length of the contour plate matches the length of the battery pack cover; when both the width and length of the rectangular frame match the battery pack cover, the length of the contour plate matches either the length or the width of the battery pack cover.
[0008] In some embodiments, at least one weight-reduction through hole is formed on the contour plate.
[0009] In some embodiments, when there are multiple contouring plates, the distance between two adjacent contouring plates is less than or equal to 10 cm.
[0010] In some embodiments, there are 2-3 reinforcing rods.
[0011] In some embodiments, the locking mechanism includes a latch-type quick clamp disposed on a rectangular frame, wherein a hook is connected to the latch-type quick clamp's buckle.
[0012] In some embodiments, the rectangular frame is further provided with a handle.
[0013] In some embodiments, the conforming plate is made of POM material.
[0014] Compared with existing technologies, the beneficial effects of this utility model are as follows: This utility model improves the fit between the clamping fixture and the cover plate by using a contour plate, thereby distributing the clamping force of the clamping fixture onto the cover plate through the contour plate. The pressure sensor and digital pressure display head enable monitoring of the cover plate pressure, facilitating judgment of whether the clamping force of the clamping fixture on the battery pack is appropriate based on the pressure value, thus preventing damage to the battery pack cover plate. Furthermore, during multiple inflation tests of the battery pack, the pressure value displayed on the digital display head ensures consistent clamping force on the cover plate in each test, preventing cover plate cracking and damage while ensuring consistent test pressure and improving the test pass rate. The rectangular frame's length and width dimensions and the weight-reducing holes on the contour plate reduce the weight of the clamping fixture, facilitating its handling. The addition of handles and latch-type quick-release clamps further enhances the ease of operation of the clamping fixture.
[0015] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the clamping fixture when the upper surface of the battery pack cover is flat or nearly flat. Figure 1 .
[0017] Figure 2 This is a schematic diagram of the clamping fixture when the upper surface of the battery pack cover is flat or nearly flat. Figure 2 .
[0018] Figure 3 This is a schematic diagram of the clamping fixture when the upper surface of the battery pack cover is flat or nearly flat. Figure 3 .
[0019] Figure 4 This is an assembly drawing of the clamping fixture and the battery pack when the upper surface of the battery pack cover is near a plane.
[0020] The components include: 1. rectangular frame; 2. reinforcing rod; 3. contour plate; 4. digital pressure display head; 5. weight-reducing through hole; 6. handle; 7. latch-type quick clamp; 8. hook; and 9. pressure sensor. Detailed Implementation
[0021] like Figures 1 to 4As shown, a clamping fixture for battery pack airtightness testing includes a rectangular frame 1. The rectangular frame 1 contains one or more reinforcing rods 2, and each reinforcing rod 2 corresponds to a contour plate 3. Specifically, the bottom surface of the contour plate 3 matches the upper surface of the battery pack cover. That is, when the clamping fixture is positioned above the battery pack cover, the bottom surface of the contour plate 3 is in contact with the upper surface of the battery pack cover, facilitating the distribution of the clamping force of the clamping fixture onto the cover through the contour plate 3. It should be noted that when the groove depth and width of the upper surface of the battery pack cover are shallow, the upper surface of the cover can be considered approximately flat, and the bottom surface of the contour plate 3 can be set as a plane. Whether it is approximately flat can be determined based on the actual situation. For example, when the groove depth is less than 3cm and the width is less than 10cm, the upper surface of the cover can be considered approximately flat. The contour plate 3 is located below the rectangular frame 1. The reinforcing rod 2 and the contour plate 3 have mounting holes that pass through them. A pressure sensor 9 is installed in the mounting hole. The pressure sensor 9 is used to detect the pressure on the battery pack cover. Specifically, the detection surface of the pressure sensor 9 is flush with the bottom surface of the mounting hole. When the clamping fixture is placed above the battery pack cover, the pressure sensor 9 can detect the pressure on the battery pack cover. A pressure digital display 4 is located above the mounting hole. The pressure digital display 4 is connected to the pressure sensor 9 and is used to display the pressure detected by the pressure sensor 9. The rectangular frame 1 also has a locking mechanism for locking the clamping fixture to the battery pack. Specifically, during an airtightness test, the clamping fixture is fixed to the battery pack using the locking mechanism. Before filling the battery pack with test gas, the pressure value displayed on the pressure digital display 4 is observed, and the appropriate clamping force of the clamping fixture on the battery pack is determined based on the pressure value. Specifically, if the pressure value on the pressure display 4 reaches the same as the pressure generated by the weight of the clamping fixture itself before the battery pack is inflated, the clamping force can be considered appropriate. Furthermore, during multiple inflation tests of the battery pack, the pressure value is tested before each inflation. Maintaining the pressure value displayed on the pressure display 4 ensures consistency in the clamping force on the cover plate during each test. This prevents the cover plate from cracking or being damaged, while also ensuring consistent test pressure and improving the test pass rate.
[0022] In some embodiments, at least one of the length and width of the rectangular frame 1 matches the battery pack cover. Specifically, when the length of the rectangular frame 1 matches the length of the battery pack cover, the locking mechanism may be located at both ends in the length direction of the rectangular frame 1. When the width direction of the rectangular frame 1 matches the width of the cover, the locking mechanism may be located at both ends in the width direction of the rectangular frame 1. In practical use, the size of the rectangular frame 1 can be reduced by shortening its length or width, thereby reducing the weight of the rectangular frame 1.
[0023] In some embodiments, when the length of the rectangular frame 1 matches the length of the battery pack cover, the reinforcing rod 2 is parallel to the width direction of the rectangular frame 1. When the width of the rectangular frame 1 matches the width of the battery pack cover, the reinforcing rod 2 is parallel to the length direction of the rectangular frame 1. When both the width and length of the rectangular frame 1 match the battery pack cover, the reinforcing rod 2 is parallel to either the length or width direction of the rectangular frame 1.
[0024] In some embodiments, when the length of the rectangular frame 1 matches the length of the battery pack cover, the length of the contour plate 3 matches the width of the battery pack cover. When the width of the rectangular frame 1 matches the width of the battery pack cover, the length of the contour plate 3 matches the length of the battery pack cover. When both the width and length of the rectangular frame 1 match the battery pack cover, the length of the contour plate 3 matches either the length or the width of the battery pack cover.
[0025] It should be noted that the matching length and matching width mentioned in this utility model refer to the relationship that the length and width are equal, slightly larger, or slightly smaller than each other, and can be determined according to actual needs.
[0026] In some embodiments, at least one weight-reducing through hole 5 is formed on the contour plate 3.
[0027] In some embodiments, when there are multiple contour plates 3, the spacing between two adjacent contour plates 3 is less than or equal to 10 cm, and more preferably, the spacing is between 5 and 10 cm.
[0028] In some embodiments, the reinforcing rod 2 consists of 2-3 rods, more preferably 3 rods.
[0029] In some embodiments, the locking mechanism includes a latch-type quick clamp 7 mounted on a rectangular frame 1. A hook 8 is connected to the retaining ring of the latch-type quick clamp 7, and the hook 8 is used to hook the battery pack. It should be noted that the latch-type quick clamp 7 in this invention can be a structure well-known to those skilled in the art, such as the Jiagang CH-40380 model latch-type quick clamp 7. In actual use, the distance between the retaining ring and the quick clamp column can be adjusted by adjusting the position of the nut on the retaining ring relative to the retaining ring, thereby adjusting the distance between the hook 8 and the rectangular frame 1, thus achieving adjustment of the clamping force between the clamping fixture and the cover plate.
[0030] In some embodiments, the rectangular frame 1 is further provided with a handle 6.
[0031] In some embodiments, the contour plate 3 is made of POM material.
[0032] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.
[0033] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0034] In this utility model, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.
[0035] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.
Claims
1. A clamping fixture for testing the airtightness of a battery pack, characterized in that: The device includes a rectangular frame with one or more reinforcing rods inside. Each reinforcing rod corresponds to a contour plate located below the rectangular frame. The reinforcing rods and contour plates have mounting holes that pass through them. A pressure sensor is installed in the mounting hole to detect the pressure of the battery pack cover. A digital pressure display is located above the mounting hole and is connected to the pressure sensor. The rectangular frame also has a locking mechanism for locking the clamping fixture to the battery pack.
2. The clamping fixture for battery pack airtightness testing according to claim 1, characterized in that: At least one of the length and width of the rectangular frame matches the battery pack cover.
3. The clamping fixture for battery pack airtightness testing according to claim 2, characterized in that: When the length of the rectangular frame matches the length of the battery pack cover, the reinforcing rod is parallel to the width direction of the rectangular frame; when the width of the rectangular frame matches the width of the battery pack cover, the reinforcing rod is parallel to the length direction of the rectangular frame; when both the width and length of the rectangular frame match the battery pack cover, the reinforcing rod is parallel to either the length or width direction of the rectangular frame.
4. The clamping fixture for battery pack airtightness testing according to claim 3, characterized in that: When the length of the rectangular frame matches the length of the battery pack cover, the length of the contour plate matches the width of the battery pack cover; when the width of the rectangular frame matches the width of the battery pack cover, the length of the contour plate matches the length of the battery pack cover; when both the width and length of the rectangular frame match the battery pack cover, the length of the contour plate matches either the length or the width of the battery pack cover.
5. The clamping fixture for battery pack airtightness testing according to claim 1, characterized in that: At least one weight-reducing through hole is provided on the conformal plate.
6. The clamping fixture for battery pack airtightness testing according to claim 1, characterized in that: When there are multiple templates, the distance between two adjacent templates is less than or equal to 10cm.
7. The clamping fixture for battery pack airtightness testing according to claim 1, characterized in that: There are 2-3 reinforcing rods.
8. The clamping fixture for battery pack airtightness testing according to claim 1, characterized in that: The locking mechanism includes a latch-type quick clamp mounted on a rectangular frame, with a hook connected to the latch-type quick clamp's buckle.
9. The clamping fixture for battery pack airtightness testing according to claim 1, characterized in that: The rectangular frame is also equipped with handles.
10. The clamping fixture for battery pack airtightness testing according to claim 1, characterized in that: The profile plate is made of POM material.