Lithium battery module plastic steel belt strength test fixing clamp and test device
By designing a fixing fixture for testing the strength of plastic steel strips in lithium battery modules, and using upper and lower pins to support the plastic steel strips to form a quadrilateral structure, the problem of testing errors caused by unstable clamping in existing testing devices is solved, and accurate measurement of the strength of plastic steel strips is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-31
- Publication Date
- 2026-03-13
AI Technical Summary
Existing lithium battery module plastic steel strip strength testing devices cannot break the strip when the clamping force is insufficient, and the measured tensile force value is significantly lower than the actual strength when the clamping force is too tight, resulting in inaccurate test results.
A strength testing fixture for a lithium battery module plastic steel strip is designed, including an upper fixture and a lower fixture spaced apart. Two upper pins and two lower pins pass through the inside of the plastic steel strip to form a quadrilateral structure to support the plastic steel strip to be tested. The adjustable pin holes and pins simulate the actual stress state to ensure stable clamping.
It effectively prevents the plastic steel strip from shifting, sliding, and breaking abnormally during the stretching process, accurately simulates the actual stress state, obtains the maximum load of the plastic steel strip, and improves testing accuracy and production efficiency.
Smart Images
Figure CN223992757U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of lithium battery module production technology, specifically to a lithium battery module plastic steel strip strength testing fixture and testing device. Background Technology
[0002] In the production of lithium battery modules, the welding and forming of plastic-coated steel strips is a key process in module assembly. Current technology typically uses a packaging machine to complete the welding according to preset process parameters, and then controls the welding quality through first-piece quality inspection. The specific operation process is as follows: the plastic-coated steel strip is cut with a pre-existing tensile clamping distance on both sides of the joint; a tensile testing machine is used to perform a tensile test on the welded joint; and the welding strength is assessed by measuring the breaking tensile force value to determine whether it meets the process standards.
[0003] Existing tensile testing devices have the following technical defects:
[0004] When the clamping force is insufficient, the clamping section of the plastic steel strip specimen is prone to slippage during the increase of tensile force, resulting in the phenomenon that the welded joint cannot be broken during the test.
[0005] Under excessively tight clamping conditions, localized stress concentration occurs in the contact area between the clamping surface and the plastic steel strip, causing the specimen to fracture and fail in the non-welded area, resulting in a measured tensile force value that is significantly lower than the true strength of the welded joint. Utility Model Content
[0006] The purpose of this utility model is to provide a fixing fixture and testing device for testing the strength of plastic steel strips of lithium battery modules, so as to solve the technical problems mentioned in the background art, where existing tensile testing devices cannot break the plastic steel strips of lithium battery modules when the clamping force is insufficient, and the measured tensile force value is significantly lower than the actual strength when the clamping force is too tight.
[0007] To achieve the above objectives, the technical solution provided by this utility model is as follows:
[0008] First aspect
[0009] This application provides a strength testing fixture for a lithium battery module plastic steel strip, including an upper fixture and a lower fixture that are used together and spaced apart vertically;
[0010] The upper clamp is provided with two upper pins that are spaced apart from each other and arranged in parallel.
[0011] The lower clamp is provided with two lower pins that are spaced apart from each other and arranged in parallel.
[0012] The two upper pins and two lower pins all pass through the inside of the plastic steel strip to be tested and support the plastic steel strip, so that the plastic steel strip has a quadrilateral structure.
[0013] Furthermore, the width between the two upper pins and the two lower pins is consistent with the width of the end plate of the battery module corresponding to the plastic steel strip to be tested.
[0014] Furthermore, the width between the two upper pins and the two lower pins is adjustable.
[0015] Furthermore, the upper clamp is provided with two sets of obliquely and symmetrically arranged upper pin holes. Each set of upper pin holes includes multiple upper pin holes at different height positions. The two upper pin shafts are respectively installed on the two upper pin holes at corresponding height positions in the two sets.
[0016] The lower clamp is provided with two sets of obliquely and symmetrically arranged lower pin holes. Each set of lower pin holes includes multiple lower pin holes at different height positions. The two lower pin shafts are respectively installed on the two lower pin holes at corresponding height positions in the two sets.
[0017] Furthermore, the upper clamp includes two upper fixing plates that are spaced apart from each other. Each upper fixing plate is provided with two sets of upper pin holes, and the positions of the upper pin holes on the two upper fixing plates are corresponding. Each upper pin shaft is provided between the two upper fixing plates, and both ends are inserted into the upper pin holes of the corresponding upper fixing plates.
[0018] The lower clamp includes two lower fixing plates spaced apart from each other. Each lower fixing plate is provided with two sets of lower pin holes, and the positions of the lower pin holes on the two lower fixing plates are corresponding. Each lower pin shaft is provided between the two lower fixing plates, and both ends are inserted into the lower pin holes of the corresponding lower fixing plates.
[0019] Furthermore, both upper and lower pins are cylindrical, and the R-angle formed by supporting the plastic steel strip under test is consistent with the R-angle formed by the end plate of the battery module corresponding to the plastic steel strip under test.
[0020] Furthermore, both the upper and lower pins include two fixed sections at both ends, two limiting sections respectively disposed inside the two fixed sections, and an end plate R-angle simulation section disposed between the two limiting sections, wherein the diameter of the limiting section is larger than the diameter of the fixed section and the end plate R-angle simulation section.
[0021] Furthermore, the weld joint on the plastic steel strip to be tested is located in the middle position between the upper pin and the lower pin.
[0022] Furthermore, both the upper and lower clamps are detachably connected to the connected components.
[0023] Second aspect
[0024] This application provides a lithium battery module plastic steel strip strength testing device, including the aforementioned lithium battery module plastic steel strip strength testing fixture.
[0025] Compared with the prior art, the beneficial effects of this utility model are:
[0026] This application provides a lithium battery module plastic steel strip strength testing fixture that can effectively support and position the plastic steel strip under test, preventing displacement, slippage, and abnormal breakage during the stretching process. Furthermore, the stretching method of the plastic steel strip under test can simulate the actual stress state, thereby obtaining an accurate estimate of the maximum load the plastic steel strip can withstand. Attached Figure Description
[0027] Figure 1 This is a first schematic diagram of the structure of the lithium battery module plastic steel strip strength testing fixture provided in the embodiments of this application;
[0028] In the diagram, the upper fixing hole is 1, the upper connecting block is 2, the upper pin hole is 3, the upper fixing plate is 4, the upper pin shaft is 5, the welded joint is 6, the plastic steel strip to be tested is 7, the lower pin shaft is 8, the lower fixing plate is 9, the lower pin hole is 10, the lower connecting block is 11, and the lower fixing hole is 12.
[0029] Figure 2 This is a second schematic diagram of the structure of the lithium battery module plastic steel strip strength testing fixture provided in the embodiments of this application;
[0030] Figure 3 This is a schematic diagram of the connection structure between the upper and lower pins and the plastic steel strip provided in the embodiments of this application;
[0031] In the figure, the end plate R-angle simulates segment 13, limiting segment 14, and fixing segment 15;
[0032] Figure 4 This is a schematic diagram of the structure of the upper and lower pins provided in an embodiment of this application;
[0033] Figure 5 This is a schematic diagram of the structure of the lithium battery module plastic steel strip strength testing device provided in the embodiments of this application;
[0034] In the diagram, there is an upper crossbeam 20, a lifting beam 21, a side beam 22, and a base 23;
[0035] Figure 6 This is a schematic diagram of the connection structure of the lithium battery module plastic steel strip strength testing fixture provided in the embodiments of this application;
[0036] In the figure, there is an upper fixing ear 16, an upper fixing pin 17, a lower fixing pin 18, and a lower fixing ear 19. Detailed Implementation
[0037] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0038] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", 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 component 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.
[0039] In the description of this patent, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection or setting, a detachable connection or setting, or an integral connection or setting; they can refer to a direct connection or an indirect connection. Those skilled in the art can understand the specific meaning of the above terms in this patent according to the specific circumstances.
[0040] like Figures 1-5 The diagram shows the structure of an embodiment provided by this utility model.
[0041] Example 1
[0042] like Figures 1-5 As shown, the lithium battery module plastic steel strip strength testing fixture provided in this embodiment includes an upper fixture and a lower fixture that are used together and spaced apart vertically.
[0043] The upper clamp is provided with two upper pins 5 that are spaced apart from each other and arranged in parallel.
[0044] The lower clamp is provided with two lower pins 8 that are spaced apart from each other and arranged in parallel.
[0045] The two upper pins 5 and the two lower pins 8 all pass through the inside of the plastic steel strip 7 to be tested and support the plastic steel strip 7 to be tested, so that the plastic steel strip has a quadrilateral structure.
[0046] The lithium battery module plastic steel strip strength testing fixture provided in this application can effectively support and position the plastic steel strip to be tested, and can prevent displacement, slippage, and abnormal breakage during the stretching process.
[0047] Preferably, the width between the two upper pins 5 and the two lower pins 8 is consistent with the width of the end plate of the battery module corresponding to the plastic steel strip 7 to be tested.
[0048] It should be noted that this method of stretching the plastic steel strip under test can simulate the actual stress state, thereby obtaining the accurate maximum load that the plastic steel strip can withstand, which greatly improves the measurement accuracy and production testing efficiency.
[0049] Preferably, the width between the two upper pins 5 and the two lower pins 8 is adjustable. The specific structure is as follows: the upper clamp is provided with two sets of obliquely and symmetrically arranged upper pin holes 3, each set of upper pin holes 3 includes multiple upper pin holes 3 at different height positions, and the two upper pins 5 are respectively installed on the two upper pin holes 3 at corresponding height positions in the two sets;
[0050] The lower clamp is provided with two sets of obliquely and symmetrically arranged lower pin holes 10. Each set of lower pin holes 10 includes multiple lower pin holes 10 at different height positions. The two lower pin shafts 8 are respectively installed on the two lower pin holes 10 at corresponding height positions in the two sets.
[0051] It should be noted that since the widths of the upper and lower pin holes at two positions at different heights within the two groups are different, adjustments at different heights can simulate battery module end plates of different widths.
[0052] In addition, this embodiment also provides a specific structure of an upper clamp and a lower clamp, which includes two upper fixing plates 4 arranged at a distance from front to back. Each upper fixing plate 4 is provided with two sets of upper pin holes 3, and the positions of the upper pin holes 3 on the two upper fixing plates 4 are corresponding. Each upper pin shaft 5 is arranged between the two upper fixing plates 4, and both ends are inserted into the upper pin holes 3 of the corresponding upper fixing plate 4.
[0053] The lower clamp includes two lower fixing plates 9 spaced apart from each other. Each lower fixing plate 9 is provided with two sets of lower pin holes 10, and the positions of the lower pin holes 10 on the two lower fixing plates 9 are corresponding. Each lower pin shaft 8 is provided between the two lower fixing plates 9, and both ends are inserted into the lower pin holes 10 of the corresponding lower fixing plate 9.
[0054] In order to simulate the R-angle formed by the end plate of the battery module to the plastic steel strip, the following structure is set: the two upper pins 5 and the two lower pins 8 are all cylindrical, and the R-angle formed by supporting the plastic steel strip 7 to be tested is consistent with the R-angle formed by the end plate of the battery module corresponding to the plastic steel strip 7 to be tested.
[0055] Preferably, the following specific structure is provided: the upper pin 5 and the lower pin 8 each include two fixed sections 15 disposed at both ends, two limiting sections 14 disposed on the inner sides of the two fixed sections respectively, and an end plate R-angle simulation section 13 disposed between the two limiting sections 14, wherein the diameter of the limiting section 14 is larger than the diameter of the fixed section 15 and the end plate R-angle simulation section 13.
[0056] During installation, the upper and lower pins are passed through the upper and lower pin holes respectively and set on the upper and lower pin holes at two corresponding positions. The fixed section is located in the upper or lower pin hole, and the plastic steel strip to be tested is set on the simulated section 13 of the end plate R angle.
[0057] Preferably, the weld joint 6 on the plastic steel strip 7 to be tested is located at the middle position between the upper pin 5 and the lower pin 8.
[0058] It should be noted that the fusion joint 6 is located in the middle position, which is consistent with its position on the battery module, thus ensuring effective simulation of the stress state of the plastic steel strip fusion joint after the lithium battery module expands.
[0059] Preferably, both the upper and lower clamps are detachably connected to the connected components. The specific structure is as follows:
[0060] The upper end of the upper fixing plate 4 is connected to the upper connecting block 2. The upper connecting block 2 is provided with an upper fixing hole 1. The upper connecting block 2 is detachably connected to the upper fixing ear 16 by passing the upper fixing pin 17 through the upper fixing hole 1.
[0061] The lower end of the lower fixing plate 12 is connected to a lower connecting block 11. The lower connecting block 11 is provided with a lower fixing hole 12. The lower connecting block 11 is detachably connected to the lower fixing ear 19 by passing a lower fixing pin 18 through the lower fixing hole 12.
[0062] Example 2
[0063] like Figure 6 As shown, this embodiment provides a lithium battery module plastic steel strip strength testing device, including the aforementioned lithium battery module plastic steel strip strength testing fixture.
[0064] In addition, it also includes an upper crossbeam 20, a lifting beam 21, a side beam 22, and a base 23; the side beam 22 includes two beams spaced apart on the left and right, the upper end of the two side beams 22 is provided with an upper crossbeam 20, the lower end is provided with a base 23, and a lifting beam 21 that can be raised and lowered is provided between them. The lower end of the lifting beam 21 is provided with an upper fixing ear 16, and the upper end of the base is provided with a lower fixing ear 19.
[0065] During testing, a certain length of plastic steel strapping is folded into a circle, the parameters of the plastic steel strapping packaging machine are set to the production process parameters, and the plastic steel strapping is heat-melted to form a welded joint, thus completing the plastic steel strapping to be tested.
[0066] Fix the upper clamp and lower clamp to the lifting beam and base respectively; select upper and lower pins with the same diameter according to the R angle formed in the battery module, and select upper and lower pin holes of corresponding heights according to the width of the battery module end plate for installation.
[0067] Four upper and lower pins are passed through the inside of the plastic steel strip to be tested to support the strip and keep the weld joint in the middle position, consistent with the position on the battery module, to ensure effective simulation of the stress state of the weld joint of the plastic steel strip after the lithium battery module expands.
[0068] After starting the testing device, the drive structure moves the crossbeam slowly upward. The plastic steel strip under test moves slowly with the clamp until the plastic steel strip or welded joint under test breaks. Record the breakage location and tensile force value to complete the data collection.
[0069] The fixture can be removed to reset the testing device and complete the test.
[0070] It should be noted that the driving structure, tension gauge, and host computer are not shown in the figure. These structures are not innovative and all adopt existing technologies, so they will not be described in detail here.
[0071] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.
Claims
1. A strength testing fixture for a lithium battery module plastic-steel strip, characterized in that, The upper clamp and the lower clamp are arranged in an upper-and-lower interval manner and are used in cooperation; The upper clamp is provided with two upper pin shafts (5) arranged in a left-and-right interval and parallel manner; The lower clamp is provided with two lower pin shafts (8) arranged in a left-and-right interval and parallel manner; The two upper pin shafts (5) and the two lower pin shafts (8) pass through the inner side of the plastic steel belt (7) to be tested and support the plastic steel belt (7) to be tested, so that the plastic steel belt is in a quadrilateral structure.
2. The plastic steel band strength test fixture for a lithium battery module of claim 1, wherein, The width between the two upper pin shafts (5) and the two lower pin shafts (8) is consistent with the width of the end plate of the battery module corresponding to the plastic steel belt (7) to be tested.
3. The plastic steel band strength test fixture for a lithium battery module of claim 2, wherein, The width between the two upper pin shafts (5) and the two lower pin shafts (8) is adjustable.
4. The plastic steel band strength test fixture for a lithium battery module of claim 3, wherein, The upper clamp is provided with two groups of upper pin holes (3) arranged in a diagonal and symmetrical manner, each group of upper pin holes (3) includes a plurality of upper pin holes (3) with different height positions, and the two upper pin shafts (5) are respectively installed on two upper pin holes (3) with corresponding height positions. The lower clamp is provided with two groups of lower pin holes (10) arranged in a diagonal and symmetrical manner, each group of lower pin holes (10) includes a plurality of lower pin holes (10) with different height positions, and the two lower pin shafts (8) are respectively installed on two lower pin holes (10) with corresponding height positions.
5. The plastic steel band strength test fixture for a lithium battery module of claim 4, wherein, The upper clamp includes two upper fixed plates (4) arranged in a front-and-rear interval manner, each upper fixed plate (4) is provided with two groups of upper pin holes (3), and the positions of the upper pin holes (3) provided on the two upper fixed plates (4) correspond to each other, each upper pin shaft (5) is arranged between the two upper fixed plates (4) and is inserted into the upper pin hole (3) of the corresponding upper fixed plate (4) at both ends. The lower clamp includes two lower fixed plates (9) arranged in a front-and-rear interval manner, each lower fixed plate (9) is provided with two groups of lower pin holes (10), and the positions of the lower pin holes (10) provided on the two lower fixed plates (9) correspond to each other, each lower pin shaft (8) is arranged between the two lower fixed plates (9) and is inserted into the lower pin hole (10) of the corresponding lower fixed plate (9) at both ends.
6. The plastic steel band strength test fixture for a lithium battery module of claim 1, wherein, The two upper pin shafts (5) and the two lower pin shafts (8) are in a cylindrical shape, and the R angle formed by the two upper pin shafts (5) and the two lower pin shafts (8) supporting the plastic steel belt (7) to be tested is consistent with the R angle formed by the end plate of the battery module corresponding to the plastic steel belt (7) to be tested.
7. The plastic steel band strength test fixture for a lithium battery module of claim 6, wherein, The upper pin shaft (5) and the lower pin shaft (8) each include two fixed segments (15) arranged at both ends, two limiting segments (14) respectively arranged inside the two fixed segments, and one end plate R angle simulation segment (13) arranged between the two limiting segments (14), wherein the diameter of the limiting segment (14) is greater than the diameters of the fixed segment (15) and the end plate R angle simulation segment (13).
8. The plastic steel band strength test fixture for a lithium battery module of claim 1, wherein, The position of the fusion joint (6) on the plastic steel belt (7) to be tested is at the middle position between the upper pin shaft (5) and the lower pin shaft (8).
9. The plastic steel band strength test fixture for a lithium battery module of claim 1, wherein, The upper clamp and the lower clamp are detachably connected with the connected components.
10. A device for testing the strength of a plastic steel band of a lithium battery module, characterized by, The lithium battery module plastic steel belt strength test fixing clamp includes the lithium battery module plastic steel belt strength test fixing clamp according to any one of claims 1-9.