Battery cell welding tension testing device
By employing an inclined surface and bridging component design in the battery cell welding tensile testing device, combined with a horizontally moving clamping head, the shear force error problem caused by clamp inclination in the prior art is solved, achieving high-precision battery cell welding tensile testing and protecting the battery cell.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- EVE ENERGY CO LTD
- Filing Date
- 2025-04-22
- Publication Date
- 2026-07-14
AI Technical Summary
Existing battery cell welding tensile testing devices suffer from problems such as large shear force errors due to the tilted clamp setting, low testing accuracy, poor repeatability, and easy damage to the battery cell during clamping.
The inclined surface design of the cell fixing assembly and the parallel setting of the bridging components, combined with the horizontally moving clamping head, ensure that the cell connecting row is parallel to the vertical direction to avoid shearing force. The tensile force between the cell connecting row and the cell under test is detected by the tensile test piece.
This improves the accuracy and repeatability of testing, protects the battery cells from damage, and extends the lifespan of the battery cells.
Smart Images
Figure CN224500186U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of battery technology, and in particular to a battery cell welding tensile testing device. Background Technology
[0002] The welding effect of the flexible connection of the battery cell and the tab directly determines the battery's overcurrent and internal resistance. Therefore, it is necessary to effectively test the welding effect of the lithium battery cell.
[0003] Existing equipment for testing the welding tensile strength of battery cells is the tensile testing machine, which is mostly designed for displacement rates. It uses push-pull chucks to clamp the sample for testing. The main drawbacks and shortcomings of this method are: the chucks in existing technologies are generally tilted, which introduces shear force errors when clamping the sample, resulting in low testing accuracy and poor repeatability, and requiring highly skilled operators. Furthermore, the clamping process can cause wear and damage to the battery cell connectors, affecting the later use of the battery cells and causing certain economic losses.
[0004] Therefore, there is an urgent need for a battery cell welding tensile testing device to solve the above problems. Utility Model Content
[0005] The purpose of this invention is to provide a battery cell welding tensile testing device that can effectively reduce the shear force generated during clamping, ensure the accuracy of the test, and prevent damage to the battery cell, thus ensuring the safety and long-term use of the battery cell.
[0006] To achieve this objective, the present invention adopts the following technical solution:
[0007] A battery cell welding tensile testing device, comprising:
[0008] A cell fixing assembly includes a fixing base and a fixing clamp. The fixing base has an inclined surface, and the fixing clamp is used to clamp the cell to be tested. The fixing clamp is positioned on the inclined surface so that the cell connection row of the cell to be tested is parallel to the vertical direction.
[0009] A bridging component is arranged parallel to the vertical direction and is detachably connected to the cell connection bar of the cell to be tested;
[0010] A clamping assembly includes a clamping head and a tensile test piece. The clamping head includes a first clamp and a second clamp, which are movable in a horizontal direction to approach each other and clamp the bridging member. The tensile test piece is connected to the clamping head and is used to detect the tensile force between the cell connection bar and the cell under test when the clamping head clamps the bridging member away from the fixing base.
[0011] Optionally, the angle between the inclined surface and the horizontal direction is adjustable.
[0012] Optionally, it also includes a bracket, which is mounted above the fixed base, and the clamping head is disposed on the bracket and corresponds to the cell connection row of the cell to be tested. The clamping head can move in the vertical direction.
[0013] Optionally, the clamping head further includes a connecting rod and a driving member. The connecting rod is vertically connected to the bracket. The first clamp and the second clamp are slidably disposed on the connecting rod. The driving member is disposed on the bracket. The output end of the driving member is drively connected to the first clamp and the second clamp to drive the first clamp and the second clamp to move closer or further apart from each other in the horizontal direction.
[0014] Optionally, the clamping head further includes a transmission screw, which is arranged parallel to the horizontal direction. The two sides of the transmission screw in the axial direction are respectively provided with external threads with opposite directions. The first chuck and the second chuck are respectively screwed onto the external threads at both ends of the transmission screw. The output end of the driving member is connected to the transmission screw and can drive the transmission screw to rotate around its own axis, so as to drive the first chuck and the second chuck to move closer or further apart.
[0015] Optionally, the fixing fixture includes a first clamping plate and a second clamping plate, the battery cell to be tested is clamped between the first clamping plate and the second clamping plate, the first clamping plate is fixed against the inclined surface, and the distance between the first clamping plate and the second clamping plate is adjustable.
[0016] Optionally, the first clamping plate and the second clamping plate are provided with a plurality of sets of connecting screw holes opposite each other, and the fixing fixture further includes a plurality of connecting screws, each of the connecting screws being sequentially inserted into a set of the connecting screw holes opposite each other on the first clamping plate and the second clamping plate.
[0017] Optionally, the cell fixing assembly further includes a clamping force test piece, which is disposed on the fixing fixture and is used to measure the clamping force on the cell to be tested.
[0018] Optionally, the bridging component includes a connecting end and a clamping end. The connecting end overlaps with the cell connection bar of the cell to be tested and is detachably connected by fasteners. The clamping end is used to connect the clamping head.
[0019] Optionally, the device further includes a controller, which is communicatively connected to both the clamping head and the tensile test piece. The controller is used to generate a data curve from the displacement information of the clamping head and the tensile information of the tensile test piece.
[0020] The beneficial effects of this utility model are:
[0021] The battery cell welding tensile testing device provided by this utility model, in its use, firstly, clamps the battery cell to be tested using a fixing clamp and fixes it on an inclined surface. Because the inclined surface has an inclination angle, it allows for multi-angle fixing of the battery cell to be tested, thus ensuring that the cell connection array of the battery cell to be tested is parallel to the vertical direction. Then, a bridging component is connected to the cell connection array of the battery cell to be tested. Next, the clamping head is moved to the bridging component, and the first and second clamps are moved horizontally, bringing them closer together to clamp the bridging component. Since the first and second clamps move horizontally, they can only apply horizontal force to the bridging component, greatly eliminating the shear force generated by the angled clamping, reducing the stress generated during clamping, and reducing clamping errors. Finally, the clamping head clamps the bridging component away from the fixing base, and the tensile force between the cell connection array and the battery cell to be tested is detected using a tensile testing piece. During the pulling process, the clamping head does not directly contact the cell connection bar of the cell under test, thus avoiding damage to the cell connection bar and helping to protect the cell under test and improve its service life. Attached Figure Description
[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.
[0023] Figure 1 This is a partial structural schematic diagram of the battery cell welding tensile testing device provided in this embodiment of the utility model;
[0024] Figure 2 This is a schematic diagram of the structure of the battery cell welding tensile testing device provided in this embodiment of the utility model.
[0025] In the picture:
[0026] 100. Battery cell to be tested; 101. Battery cell connector bar;
[0027] 1. Cell fixing assembly; 11. Fixing base; 111. Inclined surface; 12. Fixing clamp; 121. First clamping plate; 122. Second clamping plate; 123. Connecting screw;
[0028] 2. Bridging components;
[0029] 3. Clamping assembly; 31. Clamping head; 311. First clamp; 312. Second clamp; 313. Connecting rod; 32. Tensile test piece;
[0030] 4. Bracket;
[0031] 5. Controller. Detailed Implementation
[0032] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.
[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0034] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.
[0035] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0036] In the description of this utility model, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are used only for the convenience of describing this utility model and for 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," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.
[0037] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0038] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0039] In the description of this utility model, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this utility model, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.
[0040] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.
[0041] like Figure 1 As shown, this embodiment provides a battery cell welding tensile testing device, which includes a battery cell fixing component 1, a bridging component 2, and a clamping component 3.
[0042] Specifically, the cell fixing assembly 1 includes a fixing base 11 and a fixing clamp 12. The fixing clamp 12 is used to clamp the cell 100 to be tested. The fixing base 11 has an inclined surface 111, and the fixing clamp 12 is positioned on the inclined surface 111 so that the cell connection row 101 of the cell 100 to be tested is parallel to the vertical direction. The bridging member 2 is arranged parallel to the vertical direction and is detachably connected to the cell connection row 101 of the cell 100 to be tested. The clamping assembly 3 includes a clamping head 31 and a tensile test member 32. The clamping head 31 includes a first clamp 311 and a second clamp 312. The first clamp 311 and the second clamp 312 can move horizontally to approach each other and clamp the bridging member 2. The tensile test member 32 is connected to the clamping head 31 and is used to detect the tensile force between the cell connection row 101 and the cell 100 to be tested when the clamping head 31 clamps the bridging member 2 away from the fixing base 11.
[0043] In other words, during the use of this battery cell welding tensile testing device, firstly, the battery cell 100 to be tested is clamped using the fixing clamp 12 and fixed on the inclined surface 111. Because the inclined surface 111 has an inclination angle, the battery cell 100 can be fixed at multiple angles, thus making the cell connection row 101 of the battery cell 100 parallel to the vertical direction. Then, the bridging component 2 is connected to the cell connection row 101 of the battery cell 100. Next, the clamping head 31 is moved to the bridging component 2, and the first clamp 311 and the second clamp 312 are moved horizontally, bringing them closer together to clamp the bridging component 2. Because the first clamp 311 and the second clamp 312 move horizontally, they can only apply horizontal force to the bridging component 2, greatly eliminating the shearing force generated by the angled clamping, reducing the stress generated during the clamping process, and reducing clamping errors. Finally, the clamping head 31 holds the bridging member 2 away from the fixing base 11, and the tensile force between the cell connecting row 101 and the cell 100 under test is detected by the tensile test piece 32. In this embodiment, the tensile test piece 32 is a tensile sensor.
[0044] Specifically, the bridging component 2 includes a connecting end and a clamping end. The connecting end overlaps with the cell connection bar 101 of the cell under test 100 and is detachably connected by fasteners. The clamping end is used to connect the clamping head 31. During the pulling process, the clamping head 31 does not directly contact the cell connection bar 101 of the cell under test 100, avoiding damage to the cell connection bar 101 caused by the clamping head 31. This helps to protect the cell under test 100 and improve its service life.
[0045] To ensure that the cell connection bar 101 of the cell under test 100 is parallel to the vertical direction, the angle between the inclined surface 111 of the fixing base 11 and the horizontal direction needs to be adjustable, thereby achieving multi-angle fixation of the cell under test 100. In this embodiment, the angle between the inclined surface 111 of the fixing base 11 and the horizontal direction can be 30°, 45°, or 60°, etc., and can be determined according to the actual situation.
[0046] Continue to refer to Figure 1 The battery cell welding tensile testing device also includes a bracket 4. The bracket 4 is mounted above the fixed base 11, and the clamping head 31 is mounted on the bracket 4, corresponding to the battery cell connection row 101 of the battery cell 100 to be tested. The bracket 4 provides an installation position and support for the clamping head 31. The clamping head 31 can move vertically to the bridging member 2, thereby clamping the bridging member 2. Specifically, the clamping head 31 can be raised and lowered by a cylinder or hydraulic cylinder, or driven by a motor and transmission structure; no limitation is made here.
[0047] Optionally, the clamping head 31 further includes a connecting rod 313 and a driving member. The connecting rod 313 is vertically connected to the bracket 4, and both the first clamp 311 and the second clamp 312 are slidably mounted on the connecting rod 313. The driving member is mounted on the bracket 4, and its output end is connected to the first clamp 311 and the second clamp 312 to drive the first clamp 311 and the second clamp 312 to move closer or further apart in the horizontal direction. When the first clamp 311 and the second clamp 312 move closer together, the bridging member 2 can be clamped.
[0048] Specifically, the clamping head 31 also includes a transmission screw (not shown). The transmission screw is arranged parallel to the horizontal direction, and its two axial sides are respectively provided with external threads in opposite directions. The first chuck 311 and the second chuck 312 are respectively screwed onto the external threads at both ends of the transmission screw. The output end of the driving component is connected to the transmission screw and can drive the transmission screw to rotate around its own axis, thereby causing the first chuck 311 and the second chuck 312 to move closer or further apart. The first chuck 311 and the second chuck 312 form a screw-nut transmission mechanism with opposite directions of movement with the transmission screw, so that the first chuck 311 and the second chuck 312 can move closer or further apart by controlling the rotation of the transmission screw. In this embodiment, the driving component is a manual crank mounted on the bracket 4, which can be manually operated by the operator to clamp or release the first chuck 311 and the second chuck 312.
[0049] In this embodiment, the opposing surfaces of the first clamp 311 and the second clamp 312 are provided with anti-slip portions to prevent loosening and slippage when clamping the bridging member 2. Specifically, the anti-slip portions can be anti-slip textures provided on the first clamp 311 and the second clamp 312, or they can be anti-slip pads affixed to the first clamp 311 and the second clamp 312. The anti-slip portions are preferably anti-slip pads, which can both prevent slippage and protect the bridging member 2.
[0050] Continue to refer to Figure 1 The fixing clamp 12 includes a first clamping plate 121 and a second clamping plate 122. The battery cell 100 to be tested is clamped between the first clamping plate 121 and the second clamping plate 122. The first clamping plate 121 is fixed against the inclined surface 111. The distance between the first clamping plate 121 and the second clamping plate 122 is adjustable, thereby adjusting the magnitude of the clamping force on the battery cell 100 to be tested.
[0051] Specifically, the first clamping plate 121 and the second clamping plate 122 are provided with multiple sets of connecting screw holes facing each other. The fixing fixture 12 also includes multiple connecting screws 123, each connecting screw 123 passing through a set of corresponding connecting screw holes on the first clamping plate 121 and the second clamping plate 122. By adjusting the screwing position of the first clamping plate 121 and / or the second clamping plate 122 on the connecting screws 123, the distance between the first clamping plate 121 and the second clamping plate 122 can be adjusted. The arrangement of multiple connecting screws 123 can ensure that the force on the battery cell 100 under test is uniform, thereby improving the accuracy of the battery cell welding tensile testing device during testing.
[0052] Furthermore, the cell fixing assembly 1 also includes a clamping force test piece, which is disposed on the fixing fixture 12 and is used to measure the clamping force on the cell 100 to be tested. Through the clamping force test piece, the cell 100 to be tested can be clamped with a preset clamping force.
[0053] Optionally, such as Figure 2 As shown, the battery cell welding tensile testing device also includes a controller 5. The controller 5 is communicatively connected to the clamping head 31 and the tensile test piece 32, respectively. The controller 5 is used to generate a data curve from the displacement information of the clamping head 31 and the tensile information of the tensile test piece 32. In this embodiment, the controller 5 can be selected as a microcontroller or a PLC, etc.
[0054] The steps for using the battery cell welding tensile testing device provided in this embodiment are as follows:
[0055] Step 1: Pre-test processing: The controller 5 communicates with the clamping head 31 and the tensile test piece 32 to collect tensile force and displacement data. Before clamping, the force value and displacement value are set to zero.
[0056] Step 2, Sample preparation: Modify the battery cell 100 to be tested, weld the battery cell terminal to the battery cell connection bus 101, and connect the battery cell connection bus 101 to the bridging component 2.
[0057] Step 3, Sample clamping: Fix the battery cell 100 to be tested onto the fixing base 11 using the fixing clamp 12. The clamping head 31 is lowered to be flush with the bridging component 2. The first clamp 311 and the second clamp 312 move closer to each other to clamp the bridging component 2.
[0058] Step 4: Testing and Data Integration: Controller 5 controls the clamping head 31 to rise, increasing the force in steps to pull the bridging component 2, and feeding back the data to controller 5 to form a data curve.
[0059] Step 5: Data Analysis: During the test, force and displacement curves are automatically generated, and the relationship curves are displayed in real time based on the force value.
[0060] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.
Claims
1. A battery cell welding tensile testing device, characterized in that, include: The cell fixing assembly (1) includes a fixing base (11) and a fixing clamp (12). The fixing base (11) has an inclined surface (111). The fixing clamp (12) is used to clamp the cell to be tested (100). The fixing clamp (12) is positioned and installed on the inclined surface (111) so that the cell connection row (101) of the cell to be tested (100) is parallel to the vertical direction. A bridging component (2) is arranged parallel to the vertical direction and is detachably connected to the cell connection bar (101) of the cell to be tested (100); The clamping assembly (3) includes a clamping head (31) and a tensile test piece (32). The clamping head (31) includes a first clamp (311) and a second clamp (312). The first clamp (311) and the second clamp (312) are movable in the horizontal direction to move closer to each other and clamp the bridging member (2). The tensile test piece (32) is connected to the clamping head (31) and is used to detect the tensile force between the cell connection bar (101) and the cell to be tested (100) when the clamping head (31) clamps the bridging member (2) away from the fixing seat (11).
2. The cell welding tensile testing device according to claim 1, characterized in that, The angle between the inclined surface (111) and the horizontal direction is adjustable.
3. The cell welding tensile testing device according to claim 1, characterized in that, It also includes a bracket (4), which is mounted above the fixed base (11). The clamping head (31) is mounted on the bracket (4) and corresponds to the cell connection row (101) of the cell to be tested (100). The clamping head (31) can move in the vertical direction.
4. The cell welding tensile testing device according to claim 3, characterized in that, The clamping head (31) further includes a connecting rod (313) and a driving member. The connecting rod (313) is vertically connected to the bracket (4). The first clamp (311) and the second clamp (312) are slidably disposed on the connecting rod (313). The driving member is disposed on the bracket (4). The output end of the driving member is connected to the first clamp (311) and the second clamp (312) to drive the first clamp (311) and the second clamp (312) to move closer to or further away from each other in the horizontal direction.
5. The cell welding tensile testing device according to claim 4, characterized in that, The clamping head (31) also includes a transmission screw, which is arranged parallel to the horizontal direction. The two sides of the transmission screw in the axial direction are respectively provided with external threads with opposite directions. The first chuck (311) and the second chuck (312) are respectively screwed onto the external threads at both ends of the transmission screw. The output end of the driving member is connected to the transmission screw and can drive the transmission screw to rotate around its own axis, so as to drive the first chuck (311) and the second chuck (312) to move closer or further away from each other.
6. The cell welding tensile testing device according to claim 1, characterized in that, The fixing clamp (12) includes a first clamping plate (121) and a second clamping plate (122). The battery cell (100) to be tested is clamped between the first clamping plate (121) and the second clamping plate (122). The first clamping plate (121) is fixed against the inclined surface (111). The distance between the first clamping plate (121) and the second clamping plate (122) is adjustable.
7. The cell welding tensile testing device according to claim 6, characterized in that, The first clamping plate (121) and the second clamping plate (122) are provided with a plurality of sets of connecting screw holes opposite each other. The fixing clamp (12) also includes a plurality of connecting screws (123), each of the connecting screws (123) passing through a set of the connecting screw holes opposite each other on the first clamping plate (121) and the second clamping plate (122) in sequence.
8. The cell welding tensile testing device according to any one of claims 1-7, characterized in that, The cell fixing assembly (1) further includes a clamping force test piece, which is disposed on the fixing fixture (12) and is used to measure the clamping force on the cell (100) to be tested.
9. The cell welding tensile testing device according to any one of claims 1-7, characterized in that, The bridging component (2) includes a connecting end and a clamping end. The connecting end overlaps with the cell connection bar (101) of the cell to be tested (100) and is detachably connected by fasteners. The clamping end is used to connect the clamping head (31).
10. The cell welding tensile testing device according to any one of claims 1-7, characterized in that, It also includes a controller (5), which is communicatively connected to the clamping head (31) and the tensile test piece (32) respectively. The controller (5) is used to form a data curve from the displacement information of the clamping head (31) and the tensile information of the tensile test piece (32).