Test fixture for square battery

Abstract

The utility model provides a test fixture for a square battery, which comprises a fixture base, a limiting block and a limiting cover plate, a part of the surface of the fixture base is recessed to form a bearing groove, and the bearing groove is used for placing the square battery. A first groove wall surface and a second groove wall surface which are adjacent in the bearing groove are respectively used for limiting a first outer wall surface and a second outer wall surface which are adjacent in the square battery; wherein at least the third groove wall surface of the bearing groove is provided with a first avoiding gap for avoiding a third outer wall surface, provided with a tab, of the square battery, so as to adapt to the square batteries with different lengths; the limiting block is arranged at the bearing groove and is used for limiting the fourth outer wall surface of the square battery; and the limiting cover plate covers the notch of the bearing groove and is used for limiting the thickness direction of the square battery. According to the utility model, the problem of poor universality of the test fixture in the prior art is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery testing, in particular to a testing fixture for square batteries. Background Art

[0002] In an era of rapid iteration of electronic products, the increase in R&D costs and the demand for rapid development continue to accelerate. The rapid development of batteries in handheld electronic devices is also gradually being put on the agenda. High-temperature stress testing of batteries is an indispensable part of this.

[0003] In the prior art, a single fixture is usually developed for a specific battery model to perform battery clamping testing. The fixture development cost is high and the development cycle is long, which increases the battery testing cost. Utility Model Content

[0004] The main purpose of the utility model is to provide a test fixture for square batteries, so as to solve the problem of poor versatility of the test fixture in the prior art.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a test fixture for square batteries, including a fixture base, a limit block and a limit cover plate. Part of the surface of the fixture base is recessed to form a bearing groove, which is used to place the square battery, and the adjacent first groove wall surface and the second groove wall surface in the bearing groove are respectively used to limit the adjacent first outer wall surface and the second outer wall surface in the square battery; wherein, at least the third groove wall surface of the bearing groove has a first avoidance gap, which is used to avoid the third outer wall surface of the square battery with a pole ear, so as to adapt to square batteries of different lengths; the limit block is arranged at the bearing groove to limit the fourth outer wall surface of the square battery; the limit cover plate is arranged at the notch of the bearing groove to limit the thickness direction of the square battery.

[0006] In an exemplary embodiment, the limiting block is detachably connected to the clamp base; and / or the limiting cover is detachably connected to the clamp base.

[0007] In an exemplary embodiment, the limiting block is slidably disposed at the bearing groove, so that the distance between the second groove wall and the limiting block can be adjusted by sliding the limiting block, so as to adapt to square batteries of different widths.

[0008] In an exemplary embodiment, a waist-shaped hole is provided on the limit block, and the waist-shaped hole extends along a first direction, and the first direction is perpendicular to the wall surface of the second groove. A limit hole is provided on the bottom surface of the bearing groove, and the test fixture also includes a first fastener, and the first fastener has a disc-shaped head and a columnar tail; the limit block has a sliding state and a limiting state, wherein, when the limit block is in the sliding state, the columnar tail of the first fastener is passed through the waist-shaped hole; when the limit block is in the limiting state, the columnar tail passes through the waist-shaped hole and extends into the limiting hole, and the disc-shaped head is interference fit with the hole wall surface of the waist-shaped hole.

[0009] In an exemplary embodiment, there are multiple limiting holes, and the multiple limiting holes are arranged at intervals along the second direction, and the second direction is parallel to the second groove wall surface, so that the distances between each limiting hole and the second groove wall surface are equal; there are multiple waist-shaped holes, and the multiple waist-shaped holes are arranged at intervals along the second direction; there are multiple first fasteners, and the multiple first fasteners correspond one-to-one to the multiple waist-shaped holes.

[0010] In an exemplary embodiment, the fourth groove wall of the bearing groove has a second avoidance gap, the groove bottom surface of the bearing groove is provided with a guide slide groove, and the guide slide groove extends to the second avoidance gap; a guide rail is protruding from the surface of the limit block facing the side of the clamp base, and the guide rail is slidably engaged with the guide slide groove.

[0011] In an exemplary embodiment, there are multiple guide slots, which are spaced apart along the second direction, and the second direction is parallel to the second slot wall; there are multiple guide rails, which correspond one-to-one to the multiple guide slots.

[0012] In an exemplary embodiment, a stop lug is protruding from a side surface of the limiting block facing the first avoidance gap, and the stop lug extends into the first avoidance gap.

[0013] In an exemplary embodiment, the fixture base has a positioning boss, the positioning boss forms a bearing groove, and the positioning boss has a first assembly hole, wherein, when the thickness of the square battery is greater than the thickness of the positioning boss, the test fixture also includes a first gasket, the first gasket is used to support the pad on the positioning boss so that the sum of the thickness of the first gasket and the positioning boss is equal to the thickness of the square battery, the limiting cover is covered on the first gasket and the square battery, and a second assembly hole is opened at the position where the limiting cover is opposite to the first assembly hole, the test fixture also includes a second fastener, the second fastener passes through the second assembly hole and extends into the first assembly hole; or, when the thickness of the square battery is less than the thickness of the positioning boss, the test fixture also includes a second gasket, the second gasket is used to support the pad on the square battery so that the sum of the thickness of the second gasket and the square battery is equal to the thickness of the positioning boss, the limiting cover is covered on the second gasket and the square battery, and a second assembly hole is opened at the position where the limiting cover is opposite to the first assembly hole, the test fixture also includes a second fastener, the second fastener passes through the second assembly hole and extends into the first assembly hole.

[0014] In an exemplary embodiment, the test fixture further includes a stop boss, which is protruding from the positioning boss so that a stop surface is formed at the connection between the stop boss and the positioning boss, and the stop surface is used to limit the limiting cover plate.

[0015] By applying the technical solution of the present utility model, a test fixture for square batteries is provided, comprising a fixture base, a limit block and a limit cover plate, wherein part of the surface of the fixture base is recessed to form a bearing groove, the bearing groove is used to place the square battery, and the adjacent first groove wall surface and the second groove wall surface in the bearing groove are respectively used to limit the adjacent first outer wall surface and the second outer wall surface in the square battery; at least the third groove wall surface of the bearing groove has a first avoidance gap, which is used to avoid the third outer wall surface of the square battery with a pole ear, so as to adapt to square batteries of different lengths; the limit block is arranged at the bearing groove to limit the fourth outer wall surface of the square battery; the limit cover plate is arranged at the notch of the bearing groove to limit the thickness direction of the square battery. In this way, the setting of the first avoidance gap can be used to avoid the third outer wall surface of the square battery with the pole ear, so that the test fixture provided by the present application can be used to adapt to square batteries of different lengths, greatly improving the versatility of the test fixture of the present application; in addition, the setting of the limit block plays a role in limiting the width direction of the square battery, ensuring the reliability of the test fixture clamping the square battery, and the setting of the limit cover plays a role in limiting the thickness direction of the square battery, ensuring the reliability of the test fixture clamping the square battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting part of this application are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0017] Figure 1 A schematic structural diagram of a test fixture clamping a square battery according to an optional embodiment of the present utility model is shown;

[0018] Figure 2 Shown Figure 1 Schematic diagram of the structure of the test fixture and square battery in the disassembled state;

[0019] Figure 3 Shown Figure 2 A schematic structural diagram of a fixture base and a limit block of a test fixture;

[0020] Figure 4 Shown Figure 2 Schematic diagram of the structure of the fixture base of the test fixture in FIG.

[0021] The above drawings include the following reference numerals:

[0022] 1. Square battery;

[0023] 10. Clamp base; 11. Load-bearing groove; 111. First groove wall; 112. Second groove wall; 113. First avoidance notch; 114. Limiting hole; 115. Second avoidance notch; 116. Guide groove; 12. Positioning boss; 121. First assembly hole; 122. Positioning protrusion;

[0024] 20. Limit block; 21. Waist-shaped hole; 22. Guide rail; 23. Stop lug;

[0025] 30. Limit cover plate; 31. Second assembly hole; 32. Avoidance hole; 33. Positioning hole;

[0026] 40. First fastener; 41. Disc-shaped head; 42. Columnar tail;

[0027] 50. Second fastener; 60. Stop boss. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] In order to solve the problem of poor versatility of the test fixture in the prior art, the utility model provides a test fixture for square batteries.

[0030] like Figures 1 to 4 As shown, the test fixture for square batteries includes a fixture base 10, a limit block 20 and a limit cover 30, wherein a portion of the surface of the fixture base 10 is recessed to form a bearing groove 11, the bearing groove 11 is used to place the square battery 1, and the adjacent first groove wall 111 and second groove wall 112 in the bearing groove 11 are respectively used to limit the adjacent first outer wall and second outer wall in the square battery 1; wherein, at least the third groove wall of the bearing groove 11 has a first avoidance gap 113, which is used to avoid the third outer wall of the square battery 1 with the pole ear, so as to adapt to square batteries 1 of different lengths; the limit block 20 is arranged at the bearing groove 11, which is used to limit the fourth outer wall of the square battery 1; the limit cover 30 is covered at the notch of the bearing groove 11, which is used to limit the thickness direction of the square battery 1.

[0031] By applying the technical solution of the present invention, a test fixture for square batteries is provided, comprising a fixture base 10, a limit block 20 and a limit cover 30, wherein a portion of the surface of the fixture base 10 is recessed to form a bearing groove 11, the bearing groove 11 is used to place the square battery 1, and the adjacent first groove wall 111 and second groove wall 112 in the bearing groove 11 are respectively used to limit the adjacent first outer wall and second outer wall in the square battery 1; at least the third groove wall of the bearing groove 11 has a first avoidance gap 113, which is used to avoid the third outer wall of the square battery 1 with the pole ear, so as to adapt to square batteries 1 of different lengths; the limit block 20 is arranged at the bearing groove 11 to limit the fourth outer wall of the square battery 1; the limit cover 30 is covered at the notch of the bearing groove 11 to limit the thickness direction of the square battery 1. In this way, the setting of the first avoidance gap 113 can be used to avoid the third outer wall surface of the square battery 1 with the pole ear, so that the test fixture provided by the present application can be used to adapt to square batteries 1 of different lengths, which greatly improves the versatility of the test fixture of the present application; in addition, the setting of the limit block 20 plays a role in limiting the width direction of the square battery 1, ensuring the reliability of the test fixture clamping the square battery 1, and the setting of the limit cover 30 plays a role in limiting the thickness direction of the square battery 1, ensuring the reliability of the test fixture clamping the square battery 1.

[0032] It should be noted that in the present application, the limit block 20 is detachably connected to the clamp base 10; and / or the limit cover 30 is detachably connected to the clamp base 10. This ensures that the limit block 20 and the clamp base 10 are easily assembled and disassembled, and that the limit cover 30 and the clamp base 10 are easily assembled and disassembled.

[0033] It should be noted that, in the present application, the limit block 20 is slidably disposed at the bearing groove 11, so that the distance between the second groove wall 112 and the limit block 20 can be adjusted by sliding the limit block 20, so as to adapt to square batteries 1 of different widths. In this way, by setting the limit block 20 in a slidable structure, the test fixture provided in the present application can be applied to square batteries 1 of different lengths and widths, further improving the applicability of the test fixture.

[0034] like Figures 2 to 4As shown, a waist-shaped hole 21 is provided on the limit block 20, and the waist-shaped hole 21 extends along a first direction, and the first direction is perpendicular to the second groove wall 112. A limiting hole 114 is provided on the bottom surface of the bearing groove 11, and the test fixture also includes a first fastener 40, and the first fastener 40 has a disc-shaped head 41 and a columnar tail 42; the limit block 20 has a sliding state and a limiting state, wherein, when the limit block 20 is in the sliding state, the columnar tail 42 of the first fastener 40 is passed through the waist-shaped hole 21; when the limit block 20 is in the limiting state, the columnar tail 42 passes through the waist-shaped hole 21 and extends into the limiting hole 114, and the disc-shaped head 41 is interference fit with the hole wall of the waist-shaped hole 21. In this way, the setting of the waist-shaped hole 21 and the limiting hole 114 ensures the sliding reliability of the limiting block 20. In addition, when the columnar tail 42 is passed through the waist-shaped hole 21, it plays a sliding guiding role for the limiting block 20, ensuring the sliding reliability of the limiting block 20. Furthermore, the disc-shaped head 41 has an interference fit with the hole wall of the waist-shaped hole 21, ensuring that the disc-shaped head 41 can limit the limiting block 20 on the clamp base 10, thereby ensuring the limiting reliability of the limiting block 20.

[0035] It should be noted that in the present application, there are multiple limiting holes 114, and the multiple limiting holes 114 are spaced apart along the second direction, which is parallel to the second groove wall surface 112, so that the distances between each limiting hole 114 and the second groove wall surface 112 are equal; there are multiple waist-shaped holes 21, and the multiple waist-shaped holes 21 are spaced apart along the second direction; there are multiple first fasteners 40, and the multiple first fasteners 40 correspond one-to-one with the multiple waist-shaped holes 21. In this way, the sliding of the limiting block 20 through the one-to-one correspondence between the multiple waist-shaped holes 21 and the multiple first fasteners 40 is ensured, thereby ensuring the smooth sliding of the limiting block 20, and preventing the limiting block 20 from shaking or rotating during the sliding process.

[0036] Preferably, if Figures 2 to 4 As shown, there are two limiting holes 114, which are spaced apart along the second direction; there are two waist-shaped holes 21, which are spaced apart along the second direction; there are two first fasteners 40, which correspond one-to-one to the multiple waist-shaped holes 21.

[0037] like Figures 2 to 4As shown, the fourth groove wall surface of the bearing groove 11 has a second avoidance notch 115, and the groove bottom surface of the bearing groove 11 is provided with a guide groove 116, which extends to the second avoidance notch 115. A guide rail 22 is protruding from the surface of the limit block 20 facing the fixture base 10, and the guide rail 22 slides in conjunction with the guide groove 116. In this way, the provision of the second avoidance notch 115 plays a role in avoiding the limit block 20, ensuring that the limit block 20 will not interfere with the fourth groove wall surface of the bearing groove 11 during its sliding process. In addition, the guide rail 22 slides in conjunction with the guide groove 116 to ensure the sliding reliability of the limit block 20.

[0038] It should be noted that, in the present application, there are multiple guide slots 116, which are spaced apart along the second direction, and the second direction is parallel to the second slot wall 112. There are multiple guide rails 22, and the multiple guide rails 22 correspond one-to-one with the multiple guide slots 116. In this way, the sliding reliability and smoothness of the limit block 20 are ensured by the sliding cooperation between the multiple guide rails 22 and the multiple guide slots 116.

[0039] like Figures 2 to 4 As shown, there are two guide slots 116 and two guide rails 22 , and the two guide rails 22 correspond one to one with the two guide slots 116 .

[0040] like Figure 4 As shown, the two limiting holes 114 are respectively located on the same side of the two guiding slots 116 .

[0041] like Figures 1 to 4As shown, the fixture base 10 has a positioning boss 12, the positioning boss 12 surrounds the bearing groove 11, and the positioning boss 12 has a first assembly hole 121, wherein, when the thickness of the square battery 1 is greater than the thickness of the positioning boss 12, the test fixture further includes a first gasket, the first gasket is used to support the positioning boss 12, so that the sum of the thickness of the first gasket and the positioning boss 12 is equal to the thickness of the square battery 1, the limiting cover 30 is covered on the first gasket and the square battery 1, and the limiting cover 30 is provided with a second assembly hole 31 at a position opposite to the first assembly hole 121, and the test fixture further includes a second fastener 50, the second fastener The fastener 50 passes through the second assembly hole 31 and extends into the first assembly hole 121; or, when the thickness of the square battery 1 is less than the thickness of the positioning boss 12, the test fixture further includes a second gasket, which is used to support the square battery 1 so that the sum of the thickness of the second gasket and the square battery 1 is equal to the thickness of the positioning boss 12, and the limiting cover 30 is covered on the second gasket and the square battery 1, and the limiting cover 30 is provided with a second assembly hole 31 at a position opposite to the first assembly hole 121. The test fixture further includes a second fastener 50, which passes through the second assembly hole 31 and extends into the first assembly hole 121. In this way, by providing the first gasket and the second gasket, the test fixture provided in the present application can be applied to square batteries 1 of different thicknesses, which greatly improves the versatility of the test fixture of the present application.

[0042] like Figure 1 and Figure 2 As shown, an avoidance hole 32 is formed at a position of the limiting cover plate 30 opposite to the limiting hole 114 .

[0043] like Figures 2 to 4 As shown, a positioning protrusion 122 is protruded from the partially L-shaped positioning boss 12, and a positioning hole 33 for cooperating with the positioning protrusion 122 is provided at a position opposite to the positioning protrusion 122 of the limiting cover plate 30, thereby ensuring the positioning reliability of the limiting cover plate 30 when installed on the clamp base 10.

[0044] like Figure 3 As shown, a portion of the positioning boss 12 is provided between the first avoidance notch 113 and the second avoidance notch 115 , and a first assembly hole 121 is provided on the positioning boss 12 . The other portion of the positioning boss 12 is L-shaped.

[0045] like Figure 2 and Figure 3As shown, a stop lug 23 is provided on one side of the limit block 20 facing the first avoidance notch 113. The stop lug 23 extends into the first avoidance notch 113. Thus, as the stop lug 23 slides with the limit block 20, the stop lug 23 and the positioning boss 12 located between the first avoidance notch 113 and the second avoidance notch 115 function as a stop, preventing the limit block 20 from sliding off the fixture base 10.

[0046] Preferably, the limiting block 20 and the stopping lug 23 are integrally formed.

[0047] like Figures 2 to 4 As shown, the test fixture further includes a stop boss 60, which protrudes from the positioning boss 12 so that the connection between the stop boss 60 and the positioning boss 12 forms a stop surface, which is used to limit the position of the limit cover plate 30. In this way, the stop boss 60 plays a role in abutting and limiting the position of the limit cover plate 30, and the limit cover plate 30 can also play a role in positioning the limit cover plate 30.

[0048] It should be noted that in this application, the materials of the clamp base 10, the limit block 20, and the limit cover 30 are all made of stainless steel, the first fastener 40 and the second fastener 50 are both made of stainless steel, and the first gasket and the second gasket are both made of PET or stainless steel.

[0049] By applying the technical solution of the present invention, a test fixture for square batteries is provided, comprising a fixture base 10, a limit block 20 and a limit cover 30, wherein a portion of the surface of the fixture base 10 is recessed to form a bearing groove 11, the bearing groove 11 is used to place the square battery 1, and the adjacent first groove wall 111 and second groove wall 112 in the bearing groove 11 are respectively used to limit the adjacent first outer wall and second outer wall in the square battery 1; at least the third groove wall of the bearing groove 11 has a first avoidance gap 113, which is used to avoid the third outer wall of the square battery 1 with the pole ear, so as to adapt to square batteries 1 of different lengths; the limit block 20 is arranged at the bearing groove 11 to limit the fourth outer wall of the square battery 1; the limit cover 30 is covered at the notch of the bearing groove 11 to limit the thickness direction of the square battery 1. In this way, the setting of the first avoidance gap 113 can be used to avoid the third outer wall surface of the square battery 1 with the pole ear, so that the test fixture provided by the present application can be used to adapt to square batteries 1 of different lengths, which greatly improves the versatility of the test fixture of the present application; in addition, the setting of the limit block 20 plays a role in limiting the width direction of the square battery 1, ensuring the reliability of the test fixture clamping the square battery 1, and the setting of the limit cover 30 plays a role in limiting the thickness direction of the square battery 1, ensuring the reliability of the test fixture clamping the square battery 1.

[0050] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0051] Unless otherwise specifically stated, the relative arrangement of the parts and steps, the numerical expressions and the numerical values set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values should be interpreted as being merely exemplary and not as limitations. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0052] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0053] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, tasks, devices, components and / or combinations thereof.

[0054] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0055] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A test fixture for square batteries, characterized in that: include: A clamp base (10), wherein a portion of the surface of the clamp base (10) is recessed to form a bearing groove (11), the bearing groove (11) is used to place a square battery (1), and adjacent first groove wall surfaces (111) and second groove wall surfaces (112) in the bearing groove (11) are respectively used to limit adjacent first outer wall surfaces and second outer wall surfaces in the square battery (1); Wherein, at least the third groove wall surface of the carrying groove (11) has a first avoidance gap (113) for avoiding the third outer wall surface of the square battery (1) with the tab, so as to adapt to the square batteries (1) of different lengths; a limiting block (20), the limiting block (20) being arranged at the carrying slot (11) to limit the fourth outer wall surface of the square battery (1); A limiting cover plate (30) is provided on the notch of the carrying slot (11) to limit the thickness direction of the square battery (1).

2. The test fixture according to claim 1, wherein: The limiting block (20) is detachably connected to the clamp base (10); and / or, The limiting cover plate (30) is detachably connected to the clamp base (10).

3. The test fixture according to claim 1, wherein: The limiting block (20) is slidably arranged at the bearing groove (11), so that the distance between the second groove wall (112) and the limiting block (20) can be adjusted by sliding the limiting block (20), so as to adapt to square batteries (1) of different widths.

4. The test fixture according to claim 3, wherein: The limiting block (20) is provided with a waist-shaped hole (21), the waist-shaped hole (21) extends along a first direction, the first direction is perpendicular to the second groove wall (112), and a limiting hole (114) is provided on the groove bottom surface of the bearing groove (11). The test fixture further includes a first fastener (40), the first fastener (40) having a disc-shaped head (41) and a columnar tail (42); The limit block (20) has a sliding state and a limiting state, wherein when the limit block (20) is in the sliding state, the columnar tail (42) of the first fastener (40) is inserted into the waist-shaped hole (21); When the limiting block (20) is in the limiting state, the columnar tail (42) passes through the waist-shaped hole (21) and extends into the limiting hole (114), and the disc-shaped head (41) is interference-fitted with the wall surface of the waist-shaped hole (21).

5. The test fixture according to claim 4, wherein: There are a plurality of the limiting holes (114), and the plurality of the limiting holes (114) are spaced apart along a second direction, and the second direction is parallel to the second groove wall surface (112), so that the distances between each of the limiting holes (114) and the second groove wall surface (112) are equal; There are a plurality of waist-shaped holes (21), and the plurality of waist-shaped holes (21) are spaced apart along the second direction; There are a plurality of the first fasteners (40), and the plurality of the first fasteners (40) correspond one-to-one to the plurality of the waist-shaped holes (21).

6. The test fixture according to claim 3, wherein: The fourth groove wall surface of the bearing groove (11) has a second avoidance notch (115), the groove bottom surface of the bearing groove (11) is provided with a guide groove (116), and the guide groove (116) extends to the second avoidance notch (115); A guide rail (22) is protruding from the surface of the limit block (20) on the side facing the clamp base (10), and the guide rail (22) is slidably matched with the guide slot (116).

7. The test fixture according to claim 6, wherein: There are a plurality of guide slots (116), and the plurality of guide slots (116) are spaced apart along a second direction, wherein the second direction is parallel to the second slot wall surface (112); There are multiple guide rails (22), and the multiple guide rails (22) correspond one-to-one to the multiple guide slots (116).

8. The test fixture according to claim 7, wherein: A stop lug (23) is provided on a side surface of the limit block (20) facing the first avoidance gap (113), and the stop lug (23) extends into the first avoidance gap (113).

9. The test fixture according to any one of claims 1 to 8, characterized in that: The fixture base (10) has a positioning boss (12), the positioning boss (12) surrounds the bearing groove (11), and the positioning boss (12) has a first assembly hole (121), wherein, When the thickness of the square battery (1) is greater than the thickness of the positioning boss (12), the test fixture further comprises: a first gasket, the first gasket being used for supporting and padding on the positioning boss (12), so that the sum of the thickness of the first gasket and the positioning boss (12) is equal to the thickness of the square battery (1); the limiting cover (30) is covered on the first gasket and the square battery (1), and a second assembly hole (31) is formed at a position of the limiting cover (30) opposite to the first assembly hole (121); the test fixture further comprises a second fastener (50), the second fastener (50) passes through the second assembly hole (31) and extends into the first assembly hole (121); or, When the thickness of the square battery (1) is less than the thickness of the positioning boss (12), the test fixture further comprises: A second gasket is used for supporting and padding the square battery (1) so that the sum of the thickness of the second gasket and the square battery (1) is equal to the thickness of the positioning boss (12); the limiting cover (30) is covered on the second gasket and the square battery (1), and a second assembly hole (31) is opened at a position of the limiting cover (30) opposite to the first assembly hole (121); the test fixture further comprises a second fastener (50), the second fastener (50) passes through the second assembly hole (31) and extends into the first assembly hole (121).

10. The test fixture according to claim 9, wherein: The test fixture further comprises: A stop boss (60) is provided protruding from the positioning boss (12) so that a stop surface is formed at the connection between the stop boss (60) and the positioning boss (12), and the stop surface is used to limit the limiting cover plate (30).

Images