A clamping assembly for negative post and tensile test fixture

Abstract

The utility model discloses a kind of clamping assembly and stretching test tool for negative pole, it is related to negative pole test technical field, including rack, fixed clamp and movable clamp on rack, fixed clamp and movable clamp are respectively used to clamp the both ends of the negative pole to be measured, to when movable clamp is far from the action of fixed clamp, realize the stretching effect to the negative pole to be measured.The utility model realizes the accurate two-way clamping of negative pole by the synergistic effect of fixed clamp and movable clamp, in combination with the stretching action of cylinder body drive and tension sensor-gauge system, the real-time quantitative acquisition of stretching force is realized.Combining, force, data monitoring integration in one, ensure the coherence of test procedure, high function integration, for the aluminum copper composite material negative pole in process development stage, convenient stretching test can be carried out anytime and anywhere, can satisfy real-time interactive demand.

Description

Technical Field

[0001] This utility model relates to the field of negative electrode post testing technology, specifically to a clamping assembly and tensile testing fixture for negative electrode posts. Background Technology

[0002] The development of new energy vehicles has entered a new era, with lightweighting being a crucial development factor. Battery costs account for a very large proportion of this development. Most new energy vehicle battery packs consist of multiple battery modules connected in series or parallel. Each individual battery module typically requires a pair of terminals: a positive terminal and a negative terminal. Depending on the battery pack design, each electric vehicle requires several to dozens of negative terminals.

[0003] The materials used for negative electrodes have evolved from primarily pure copper to aluminum-copper composites, which are now the mainstream development direction. Aluminum-copper composite negative electrodes are typically produced using processes such as explosive welding, rolling composite welding, rotary friction welding, and friction stir spot welding. The performance of the aluminum-copper composite interface is crucial. Tensile properties, as one of the key indicators, require full or random inspection during the composite process development stage. Tensile properties are usually measured using a universal tensile testing machine and tensile fixtures.

[0004] From the perspective of equipment size and space requirements, a typical universal testing machine, such as the FL4000 series, can weigh up to 1500 kg and occupy nearly 1 square meter of space, requiring dedicated laboratory space and basic installation conditions. Although the QJ212 testing machine adopts a benchtop design, its overall dimensions still reach 960×650×2000 mm, and it weighs 1200 kg. This large size not only limits the deployment scenarios of the equipment but also increases the cost and risk of sample transportation. For aluminum-copper composite negative electrode posts in the process development stage, real-time testing is often required on the production site or composite workshop for rapid feedback and adjustment of process parameters, which is difficult for a fixed-installation testing machine to meet.

[0005] To address these issues, we propose a fixture that allows for convenient tensile performance testing anytime, anywhere. Utility Model Content

[0006] The purpose of this utility model is to solve the problems in the prior art by proposing a tensile testing fixture that integrates clamping, force application, and data monitoring into one unit. It has a high degree of functional integration and can conveniently perform tensile tests anytime and anywhere, meeting the real-time interactive needs of related products.

[0007] To solve the above problems, this utility model provides the following technical solution: A tensile testing fixture includes a frame, a fixed clamp and a movable clamp mounted on the frame. The fixed clamp and the movable clamp are used to clamp and limit the two ends of the negative electrode post to be tested, so that when the movable clamp moves away from the fixed clamp, a tensile force is applied to the negative electrode post to be tested. The fixture also includes a cylinder mounted on the frame and a force sensor for connecting the actuator of the cylinder to the movable clamp. The force sensor is electrically connected to a force gauge so that when the actuator of the cylinder applies a movement away from the fixed clamp to the movable clamp, the force gauge obtains tensile performance data.

[0008] As a further embodiment of this utility model: the movable clamp includes two sets of detachably connected upper sub-molds, any one of which is connected to one end of the tension sensor. The bottom of the upper sub-mold is provided with a first groove cavity, and the two first groove cavities together form an upper contour cavity, which is used to clamp and limit one end of the negative electrode post to be tested.

[0009] As a further embodiment of this utility model: the two upper sub-molds each have a first T-shaped insert and a first T-shaped slot, and the first T-shaped insert and the first T-shaped slot are adapted to be inserted into each other, so that after the two upper sub-molds are inserted into the first T-shaped insert and the first T-shaped slot and locked by the first bolt, the two first slot cavities are enclosed to form an upper contour cavity.

[0010] As a further embodiment of this utility model: the fixing fixture includes two sets of detachably connected lower sub-molds, any one of which is connected to the frame. The top of the lower sub-mold is provided with a second cavity, and the two second cavities together form a lower contour cavity. The lower contour cavity is used to clamp and limit the other end of the negative electrode post to be tested.

[0011] As a further embodiment of this utility model: the two lower sub-molds each have a second T-shaped insert and a second T-shaped slot, and the second T-shaped insert and the second T-shaped slot are adapted to be inserted into each other, so that after the two lower sub-molds are inserted into the second T-shaped insert and the second T-shaped slot and locked by the second bolt, the two second slot cavities are combined to form a lower contour cavity.

[0012] As a further embodiment of this invention, the tooling also includes a manual pump for communicating with the inner cavity of the cylinder.

[0013] As a further embodiment of this utility model: the frame includes a base for mounting a fixing fixture, two support rods on the base, and a carrier plate on the top of the two support rods, and the cylinder is fixedly mounted on the carrier plate.

[0014] As a further embodiment of this utility model: the tension sensor is configured as a column-type tension sensor with two internal threaded connection ends, and the two internal threaded connection ends are respectively threadedly connected to the upper auxiliary mold and the lower pull plate.

[0015] As a further embodiment of this utility model, the tooling also includes an adapter for connecting the cylinder actuator to the tension sensor; The adapter includes a pull rod movably mounted on the frame, and the pull rod can move along the stretching direction. The top and bottom ends of the pull rod are respectively provided with an upper top plate and a lower pull plate. The upper top plate is fixedly connected to the actuator end of the cylinder, and the lower pull plate is fixedly connected to the tension sensor.

[0016] As a further embodiment of this utility model: a limiting bolt 1 can be threadedly connected to the upper sub-mold connected to the tension sensor, so that when the two upper sub-molds are inserted, the limiting bolt 1 is threadedly installed on the corresponding upper sub-mold, and its head is used to prevent the other upper sub-mold from sliding out; a limiting bolt 2 can be threadedly connected to the lower sub-mold connected to the frame, so that when the two lower sub-molds are inserted, the limiting bolt 2 is threadedly installed on the corresponding lower sub-mold, and its head is used to prevent the other lower sub-mold from sliding out.

[0017] A clamping assembly for a negative terminal post includes the aforementioned fixed clamp and movable clamp, wherein the fixed clamp and movable clamp are respectively used to clamp and limit the two ends of the negative terminal post to be tested.

[0018] Compared with the prior art, the present invention has the following beneficial effects: 1. Precise bidirectional clamping of the negative electrode post is achieved through the coordinated action of fixed and movable clamps. Combined with the cylinder-driven tensile action and the force sensor-force gauge system, real-time quantitative acquisition of tensile force is realized. Clamping, force application, and data monitoring are integrated into one system, ensuring the continuity of the testing process. With high functional integration, it allows for convenient tensile testing anytime, anywhere for aluminum-copper composite negative electrode posts currently under process development, meeting real-time interactive requirements.

[0019] 2. Both the movable and fixed clamps adopt a split design, forming a contoured cavity by combining two slots. The contoured cavity fits tightly with the shape of one end of the negative electrode post, avoiding slippage or stress concentration during testing and ensuring data accuracy.

[0020] 3. Through the combined fixing method of T-shaped inserts / slots and bolts, the T-shaped structure guides the sub-mold to quickly and accurately align, ensuring seamless enclosure of the two cavities; the insertion interface bears the lateral force, and the bolts provide normal locking force, providing double protection for the structural integrity of the fixture under high load.

[0021] 4. Adding a manual pump as a hydraulic power source not only eliminates the dependence on electricity and makes it suitable for rapid testing in environments without power, but also simplifies system complexity and reduces tooling manufacturing costs and maintenance difficulty.

[0022] 5. By using the adapter, not only is the cylinder actuator isolated from the sensor, hydraulic shock and eccentric load are absorbed, extending the sensor's lifespan; but it also facilitates compatibility with different models of cylinders or sensors.

[0023] 6. The supplementary design of limit bolts one / two serves as a secondary locking mechanism after T-shaped insertion, ensuring that the two molds are always in the insertion state and preventing accidental slippage of the molds under vibration or impact. When tensile testing is required later, it reduces the need for sliding insertion of the two molds, saves testing time, and further improves the ease of use of this tooling. Attached Figure Description

[0024] The present invention will be further described below with reference to the accompanying drawings.

[0025] Figure 1 This is a three-dimensional structural schematic diagram of the present invention; Figure 2 This is an exploded structural diagram of the present invention; Figure 3 This is a schematic diagram of the modular structure of the movable clamp of this utility model; Figure 4 This is a schematic diagram of the split structure of the fixing clamp of this utility model; Figure 5 This is a schematic diagram of the three-dimensional structure of the negative electrode post to be tested according to this utility model.

[0026] In the diagram: 1. Frame; 101. Base; 102. Support rod; 103. Carrier plate; 2. Fixing fixture; 201. Lower sub-mold; 202. Second cavity; 203. Second bolt; 204. Second T-shaped insert; 205. Second T-shaped slot; 3. Movable fixture; 301. Upper sub-mold; 302. First cavity; 303. First bolt; 304. First T-shaped insert; 305. First T-shaped slot; 4. Cylinder body; 5. Tension sensor; 6. Force gauge; 7. Manual pump; 8. Pull rod; 9. Top plate; 10. Pull-down plate; 11. Limit bolt one; 12. Mounting hole; a. Negative electrode post to be tested; b. Round end; c. Rectangular end; d. Connecting post. Detailed Implementation

[0027] 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 skilled in the art without creative effort are within the protection scope of the present utility model.

[0028] Example 1: like Figures 1-2As shown, a tensile testing fixture includes a frame 1. The frame 1 includes a base 101, two support rods 102, and a carrier plate 103. The two support rods 102 are arranged in parallel on the top of the base 101. The carrier plate 103 is fixedly installed on the top of the two support rods 102. A fixed clamp 2 is provided on the base 101 to clamp and limit one end of the negative electrode post a to be tested. A movable clamp 3 is provided on the carrier plate 103 to clamp and limit the other end of the negative electrode post a to be tested. The movable clamp 3 can move away from the fixed clamp 2. Taking the fixed clamp 2 and the movable clamp 3 as examples where the fixed clamp 2 and the movable clamp 3 are both in the vertical direction and the movable clamp 3 is located above, the movable clamp 3 can move away from the fixed clamp 2 in the vertical upward direction. This movement is used to achieve the tensile test of the negative electrode post a.

[0029] For the installation of the fixing clamp 2 on the base 101, the fixing clamp 2 can be directly welded or threaded onto the base 101.

[0030] For the installation of the movable fixture 3 on the carrier plate 103, in order to meet the requirements of simple driving and data recording for tensile testing, this application has the following design: (1) Two pull rods 8 are movably installed on the carrier plate 103. The top and bottom ends of the pull rods 8 penetrate the carrier plate 103. The pull rods 8 can move along the stretching direction of the negative electrode a to be tested. The top and bottom ends of the pull rods 8 are respectively provided with an upper plate 9 and a lower plate 10.

[0031] (2) A tension sensor 5 is fixedly installed at the bottom of the pull-down plate 10. The tension sensor 5 is preferably a column-type tension sensor with two internal threaded connection ends, such as... Figure 1 As shown, the upper internal threaded connection end is fixedly connected to the pull-down plate 10, and the lower internal threaded connection end is fixedly connected to the movable clamp 3; the tension sensor 5 is electrically connected to the force gauge 6 (preferably handheld).

[0032] (3) A cylinder body (e.g., a hydraulic cylinder with an inner cavity) 4 is fixedly installed on the carrier plate 103, and the actuating end of the cylinder body 4 is arranged upward, and the actuating end of the cylinder body 4 is fixedly connected to the upper top plate 9; a manual pump 7 is connected to the inner cavity of the cylinder body 4.

[0033] Under the above design, the usage of this application is as follows: the upper and lower ends of the negative electrode post a to be tested are clamped and limited in advance by the movable clamp 3 and the fixed clamp 2 respectively. Then, the manual pump 7 is operated so that the actuator of the cylinder 4 makes an upward extension movement. This movement will drive the upper top plate 9, the pull rod 8, the lower pull plate 10, the tension sensor 5 and the movable clamp 3 to have an upward movement tendency, that is, to form an upward stretching movement of the negative electrode post a to be tested. During this stretching process, the reading on the force gauge 6 can be observed at all times. The force gauge 6 will record the force curve and data of the entire stretching process. When the negative electrode post a to be tested breaks, its tensile performance data can be obtained through the force gauge 6.

[0034] Example 2: Because the negative electrode a product to be tested in this application is Figure 5 The structure shown has a rounded end b, a rectangular end c, and a connecting post d for connecting the rounded end b and the rectangular end c. Therefore, the difference between this embodiment and Embodiment 1 is that the fixed clamp 2 and the movable clamp 3 in Embodiment 1 are adapted to fit the structure, so that they can accommodate... Figure 5 The negative electrode post a shown in the diagram has a good clamping and limiting effect. For example... Figures 3-4 As shown, the specific design is as follows: (1) Movable fixture 3: includes two sets of detachably connected upper sub-molds 301. Any one of the upper sub-molds 301 is connected to one end of the tension sensor 5. The bottom of the upper sub-mold 301 is provided with a first groove 302. The two first grooves 302 together form an upper contour cavity. The upper contour cavity is used to clamp and limit the round end b of the negative electrode post a to be tested.

[0035] (2) Fixture 2: includes two sets of detachably connected lower sub-molds 201. Any one of the lower sub-molds 201 is connected to the base 101. The top of the lower sub-mold 201 is provided with a second cavity 202. The two second cavities 202 together form a lower contour cavity. The lower contour cavity is used to clamp and limit the rectangular end c of the negative electrode post a to be tested.

[0036] like Figure 3 As shown, the detachable connection of the two upper sub-molds 301 can be configured in any of the prior art methods, such as snap-fit, fastening, threaded connection, etc. This paper proposes the following insertion method: Each of the two upper sub-molds 301 has a first T-shaped insert 304 and a first T-shaped slot 305. The first T-shaped insert 304 and the first T-shaped slot 305 are in a mating insertion relationship, so that when the two upper sub-molds 301 are inserted into each other by the first T-shaped insert 304 and the first T-shaped slot 305, the two first cavities 302 enclose an upper contour cavity. To ensure the stability of the upper contour cavity, the two upper sub-molds 301 can also be locked by a first bolt 303. Preferably, the locking direction of the first bolt 303 is perpendicular to the sliding insertion direction of the two upper sub-molds 301.

[0037] like Figure 4 As shown, the detachable connection of the two lower sub-molds 201 can be configured in any of the prior art methods, such as snap-fit, fastening, threaded connection, etc. This paper proposes the following insertion method: Each of the two lower sub-molds 201 has a second T-shaped insert 204 and a second T-shaped slot 205, and the second T-shaped insert 204 and the second T-shaped slot 205 are fitted together for insertion. After the two lower sub-molds 201 are inserted into the second T-shaped insert 204 and the second T-shaped slot 205 and locked by the second bolt 203, the two second cavities 202 enclose a lower contour cavity. To ensure the stability of the lower contour cavity, the two lower sub-molds 201 can also be locked by the second bolt 203. Preferably, the locking direction of the second bolt 203 is perpendicular to the sliding insertion direction of the two lower sub-molds 201.

[0038] It should be noted that both the first bolt 303 and the second bolt 203 can be replaced with conventional pins, dowels, etc.

[0039] Example 3: To further improve the convenience of this tooling, this embodiment adds a limiting bolt 11 and a limiting bolt 2 (not shown in the figure) based on embodiment 2.

[0040] Specifically, based on the relationship between the two upper sub-molds 301, the upper sub-mold 301 connected to the tension sensor 5 is defined as the restricted upper sub-mold, and the other upper sub-mold 301 is defined as the free upper sub-mold. The restricted upper sub-mold 301 has a mounting hole 12, and the limiting bolt 11 is detachably mounted on the mounting hole 12. When the free upper sub-mold is slidably inserted into the restricted upper sub-mold, the limiting bolt 11 can be inserted into the mounting hole 12. At this time, the head of the limiting bolt 11 (which may be fitted with a washer) will be located within the sliding path range of the free upper sub-mold. This head can block the free upper sub-mold and prevent it from sliding out of the restricted upper sub-mold.

[0041] The limiting bolt 11 ensures that even after the first bolt 303 is released from locking the free-state upper sub-mold to the restricted-state upper sub-mold, the free-state upper sub-mold will still be inserted into the restricted-state upper sub-mold. At this point, the free-state upper sub-mold can slide left and right on the restricted-state upper sub-mold without falling off. When a tensile test is required in this state, the rounded end b of the negative electrode post a to be tested can be directly placed into the first groove 302 within the restricted-state upper sub-mold. Then, the free-state upper sub-mold is driven closer to the restricted-state upper sub-mold, causing the two first grooves 302 to close and form an upper contour cavity, thus accommodating and limiting the rounded end b. This avoids the need to slide and insert the free-state upper sub-mold onto the restricted-state upper sub-mold when it is not present, saving testing time and improving the ease of use of this fixture.

[0042] The second limiting bolt acts on the fixing clamp 2, and is intended to restrict the sliding of another lower sub-mold 201 that is slidably inserted into the lower sub-mold 201 connected to the base 101. The working mechanism of the second limiting bolt is the same as that of the first limiting bolt 11. To avoid cumbersome writing, it will not be repeated here.

[0043] The above description provides a detailed account of one embodiment of the present invention. However, this description is merely a preferred embodiment and should not be construed as limiting the scope of the present invention. All equivalent variations and improvements made within the scope of the claims of the present invention should still fall within the patent coverage of the present invention.

Claims

1. A tensile testing fixture, characterized in that, The fixture includes a frame (1), a fixed clamp (2) and a movable clamp (3) mounted on the frame (1). The fixed clamp (2) and the movable clamp (3) are used to clamp and limit the two ends of the negative electrode post (a) to be tested, so that when the movable clamp (3) moves away from the fixed clamp (2), the negative electrode post (a) to be tested is stretched. The fixture also includes a cylinder (4) mounted on the frame (1) and a tension sensor (5) for connecting the actuator end of the cylinder (4) to the movable clamp (3). The tension sensor (5) is electrically connected to a force gauge (6) so that when the actuator end of the cylinder (4) applies a movement away from the fixed clamp (2) to the movable clamp (3), the force gauge (6) obtains tensile performance data.

2. The tensile testing fixture according to claim 1, characterized in that, The movable fixture (3) includes two sets of detachably connected upper sub-molds (301). Each upper sub-mold (301) is connected to one end of the tension sensor (5). The bottom of the upper sub-mold (301) is provided with a first cavity (302). The two first cavities (302) together form an upper contour cavity, which is used to clamp and limit one end of the negative electrode post (a) to be tested.

3. The tensile testing fixture according to claim 2, characterized in that, The two upper sub-molds (301) each have a first T-shaped insert (304) and a first T-shaped slot (305), and the first T-shaped insert (304) and the first T-shaped slot (305) are adapted to be inserted into each other so that after the two upper sub-molds (301) are inserted into the first T-shaped insert (304) and the first T-shaped slot (305) and locked by the first bolt (303), the two first cavities (302) are enclosed to form an upper contour cavity.

4. A tensile testing fixture according to claim 2, characterized in that, The fixing fixture (2) includes two sets of detachably connected lower sub-molds (201). Any one of the lower sub-molds (201) is connected to the frame (1). The top of the lower sub-mold (201) is provided with a second cavity (202). The two second cavities (202) together form a lower contour cavity. The lower contour cavity is used to clamp and limit the other end of the negative electrode post (a) to be tested.

5. A tensile testing fixture according to claim 4, characterized in that, The two lower sub-molds (201) each have a second T-shaped insert (204) and a second T-shaped slot (205), and the second T-shaped insert (204) and the second T-shaped slot (205) are adapted to be inserted into each other so that after the two lower sub-molds (201) are inserted into the second T-shaped insert (204) and the second T-shaped slot (205) and locked by the second bolt (203), the two second cavities (202) are enclosed to form a lower contour cavity.

6. A tensile testing fixture according to any one of claims 1-5, characterized in that, The tooling also includes a manual pump (7) for communication with the inner cavity of the cylinder (4).

7. A tensile testing fixture according to any one of claims 1-5, characterized in that, The frame (1) includes a base (101) for mounting the fixing fixture (2), two support rods (102) on the base (101) and a carrier plate (103) on the top of the two support rods (102), and the cylinder (4) is fixedly mounted on the carrier plate (103).

8. A tensile testing fixture according to any one of claims 1-5, characterized in that, The tooling also includes an adapter for connecting the actuator of the cylinder (4) to the tension sensor (5); The adapter includes a pull rod (8) movably mounted on the frame (1), and the pull rod (8) can move along the stretching direction. The top and bottom ends of the pull rod (8) are respectively provided with an upper top plate (9) and a lower pull plate (10), and the upper top plate (9) is fixedly connected to the actuator end of the cylinder (4), and the lower pull plate (10) is fixedly connected to the tension sensor (5).

9. A tensile testing fixture according to claim 5, characterized in that, A limit bolt (11) can be threaded onto the upper sub-mold (301) connected to the tension sensor (5), so that when the two upper sub-molds (301) are inserted, the limit bolt (11) is threaded onto the corresponding upper sub-mold (301), and its head is used to prevent the other upper sub-mold (301) from sliding out; a limit bolt (201) can be threaded onto the lower sub-mold (201) connected to the frame (1), so that when the two lower sub-molds (201) are inserted, the limit bolt (201) is threaded onto the corresponding lower sub-mold (201), and its head is used to prevent the other lower sub-mold (201) from sliding out.

10. A clamping assembly for a negative terminal post, characterized in that, Includes the fixed clamp (2) and the movable clamp (3) as described in any one of claims 1-9, wherein the fixed clamp (2) and the movable clamp (3) are used to clamp and limit the two ends of the negative electrode post (a) to be tested.

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