A multi-model lithium battery EOL testing fixture

Abstract

This utility model relates to the field of lithium battery manufacturing technology and discloses a multi-model lithium battery EOL testing fixture, including a positioning base, a support column disposed on the positioning base, and a probe assembly movably disposed on the support column. The positioning base is provided with a plurality of positioning pins and a plurality of pin cavities for vertical movement of the positioning pins. A return spring is disposed below the positioning pin, and a lower baffle is disposed below the positioning base. The lower end of the return spring is fixedly connected to the lower baffle, and the return spring is axially movable within the pin cavity. This utility model can achieve precise positioning of lithium batteries and can also limit and fix lithium batteries of different batches and models.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery manufacturing technology, and in particular to a multi-model lithium battery EOL testing fixture. Background Technology

[0002] To ensure the quality of lithium batteries, end-of-life (EOL) communication testing is required on the lithium battery pack circuitry. Only after passing the EOL test can the lithium battery pack be considered qualified. Currently, EOL testing of lithium batteries requires a dedicated fixture. Probes on this fixture are connected to the positive and negative terminals of the lithium battery to transmit a power-on signal to the EOL testing machine. Passing the signal test indicates the battery is qualified. During the R&D and testing phase, many small-batch lithium battery pack models require EOL testing. For example, utility model patent CN213986756U discloses a lithium battery testing fixture, relating to a testing field, including a frame on which is equipped with… The device includes a fixed base, a fixture above the fixed base, a first power mechanism on one side of the fixture, a testing mechanism inside the fixture, a pressure bar and a protective cover above the testing mechanism, a first cylinder on the upper surface of the protective cover, the protective cover being fixedly mounted on the drive shaft of the first cylinder, the first cylinder being fixedly mounted on a frame, and a control mechanism mounted on the fixed base. The first power mechanism, the testing mechanism, and the first cylinder are electrically connected to the control mechanism. This device can only test lithium batteries of the same model. In addition, in the prior art, many dedicated EOL testing fixtures need to be manufactured, increasing production and management costs. Utility Model Content

[0003] The purpose of this invention is to provide a multi-model lithium battery EOL testing fixture. In view of the current situation of small-batch testing and mass production lithium battery EOL testing processes, there is an urgent need for a multi-model lithium battery EOL testing fixture that can reduce the cost of manufacturing fixtures in small-batch production and can be used for EOL testing of various models of lithium batteries, thereby improving the efficiency of model changeover in lithium battery production.

[0004] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a multi-model lithium battery EOL testing fixture, including a positioning base, a support column disposed on the positioning base, and a probe assembly movably disposed on the support column. The positioning base is provided with a plurality of positioning pins and a plurality of pin cavities for vertical movement of the positioning pins. A return spring is disposed below the positioning pin, and a lower baffle is disposed below the positioning base. The lower end of the return spring is fixedly connected to the lower baffle, and the return spring is axially movably disposed within the pin cavity.

[0005] By adopting the above technical solution, this utility model can achieve precise positioning for each lithium battery in the same batch without multiple position adjustments, and can also fix the positioning of lithium batteries of different batches and models.

[0006] A further feature of this invention is that a sealed cavity is provided between the lower baffle and the positioning base, and an airlock valve is provided on the positioning base, the airlock valve controlling whether the cavity is connected to or blocked from the outside.

[0007] A further feature of this invention is that a sealing block is provided below the positioning needle, and the sealing block is slidably disposed within the needle cavity and connected to the reset spring.

[0008] By adopting the above technical solution, several flexible positioning pins are set on the positioning base to provide positioning for various types of lithium batteries. Below the positioning pins on the positioning base is a 2mm upper baffle, which restricts the movement of the positioning pins within the pin cavity. Below the flexible positioning pins is a return spring that provides elastic force for the flexible positioning pins to return to their original position. Below the positioning base is a lower baffle, and there is a sealed cavity between the lower baffle and the positioning base. An airlock valve is installed on the positioning base. When the lithium battery is positioned on the positioning pin, the positioning pin compresses the spring, and the pin plate on the positioning base will show the shape of the lithium battery positioning. To avoid repeated positioning, the airlock valve is opened to cut off the gas flow between the cavity and the outside. Since the cavity is a sealed space, after a lithium battery is processed and removed, the pin plate on the positioning base will show the shape of the lithium battery positioning. The next time, only the lithium battery needs to be placed into this shape.

[0009] A further feature of this invention is that the probe assembly includes a probe box, an adjusting gear, a cantilever, a probe fixing plate, and a probe. An adjusting assembly is provided between the probe box and the support column. Two cantilever arms are provided, which are slidably connected in opposite directions within the probe box. The adjusting gear is rotatably connected within the probe box. A horizontal rack is provided at one end of each cantilever arm near the gear, and the horizontal racks on the two cantilever arms mesh with the upper and lower sides of the adjusting gear, respectively. The probe fixing plate is located at the end of the cantilever arm, and the probe is located at the lower end of the probe fixing plate.

[0010] By adopting the above technical solution, an adjusting rod is coaxially fixedly connected to the adjusting gear. The adjusting rod is rotatably connected inside the probe box and extends out of the probe box end, connected to a rotating handle. When it is necessary to adjust the distance between the probes on both sides, the rotating handle rotates to drive the adjusting rod to rotate, which in turn drives the adjusting gear to rotate. During the rotation of the adjusting gear, the horizontal rack is driven to make the two cantilever arms move closer or further apart. This can be applied to the electrode spacing of various lithium battery models, achieving a compatible effect. Three probes are installed under each probe fixing plate. After docking with the lithium battery electrode, the electrode test signal is transmitted to the EOL tester.

[0011] A further feature of this invention is that the adjustment assembly includes a rotating base, a lifting frame, a connecting rod, and a lifting component. The rotating base is rotatably connected to the positioning base, and the lower end of the support column is fixedly connected to the rotating base. A lifting component is provided between the lifting frame and the support column, and the lifting component controls the lifting frame to move up and down along the support column. One end of the connecting rod is movably connected to the lifting frame, and the other end is connected to the lifting component. The lifting component is connected to the probe box to control the probe box to move up and down.

[0012] A further feature of this invention is that a vertical rack is provided on the support column, and a rotating gear is rotatably connected inside the lifting frame, the rotating gear meshing with the rack.

[0013] A further feature of this invention is that the rotating gear is axially fixedly connected to a rotating rod, the rotating rod is rotatably connected to the lifting frame, and a rotating handwheel is provided at the end of the rotating rod.

[0014] A further feature of this invention is that the connecting rod includes a first connecting rod arm, a second connecting rod arm, and a third connecting rod arm. One end of the first connecting rod arm is hinged to the lifting frame, and the other end is hinged to the second connecting rod arm. The other end of the second connecting rod arm is hinged to the third connecting rod arm, and the other end of the third connecting rod arm is hinged to the lifting component.

[0015] A further feature of this invention is that the lifting component is an adjusting cylinder, and the piston end of the adjusting cylinder is fixedly connected to the probe box.

[0016] A further feature of this invention is that locking screws are provided between the first connecting arm and the lifting frame, between the first connecting arm and the second connecting arm, and between the rotating base and the positioning base.

[0017] By adopting the above technical solution, the rotating base below the support column is rotatably connected to the positioning base, controlling the probe assembly to rotate around the support column. Simultaneously, several threaded holes are provided between the rotating base and the positioning base. The rotating base is threadedly fixed to the positioning base by a locking screw for limitation, and can be rotated and adjusted before being fixed again. A vertical rack is provided on the support column, and a rotating rod and a rotating gear are rotatably connected inside the lifting frame. The rotating gear meshes with the vertical rack. When the handwheel is turned, driving the rotating gear to rotate, the lifting frame can be raised and lowered, further driving the probe box to rise and fall. When the lifting frame moves to the appropriate position, the outer surface of the support column has an axially formed locking groove, and the lifting frame has corresponding threaded holes through which the locking screw threadedly passes. The threaded hole on the lowering frame engages with the locking groove of the support column to achieve height positioning of the lifting frame. Link arm one is hinged to the lifting frame, and a threaded hole is opened at the hinge of the lifting frame. The locking screw passes through the threaded hole and engages with the link arm for fixation. Link arm one and link arm two are hinged. Link arm one has a threaded hole. The locking screw threaded through link arm one and engages with link arm two for fixation. Link arm two has a threaded hole. The locking screw threaded through link arm two and engages with link arm three for fixation. The configuration of link arm one, link arm two and link arm three can provide adjustment and fixation at any height position. The end of link arm three is connected to an adjusting cylinder. The piston end of the adjusting cylinder is fixedly connected to the probe box to provide up and down force when the probe presses down to perform EOL testing on the lithium battery.

[0018] The beneficial effects of this utility model are as follows: This utility model has several flexible positioning pins on the positioning base, which are used to position various types of lithium batteries. Below the positioning pins on the positioning base is a 2mm upper baffle, which restricts the movement of the positioning pins within the pin cavity. Below the flexible positioning pins is a return spring, which provides elastic force for the flexible positioning pins to return to their original position. Below the positioning base is a lower baffle, and there is a sealed cavity between the lower baffle and the positioning base. An airlock valve is installed on the positioning base. When the lithium battery is positioned on the positioning pin, the positioning pin compresses the spring, and the pin plate on the positioning base will show the shape of the lithium battery positioning. To avoid repeated positioning, the airlock valve is opened to cut off the gas flow between the cavity and the outside. Since the cavity is a sealed space, after a lithium battery is processed and removed, the pin plate on the positioning base will show the shape of the lithium battery positioning. The next time, the lithium battery can simply be placed into this shape. This allows for precise positioning of each lithium battery in the same batch without multiple position adjustments, and it can also fix lithium batteries of different batches and models. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments 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 these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of this utility model.

[0021] Figure 2 This is a schematic diagram of the exploded structure of this utility model.

[0022] Figure 3 This is a partial cross-sectional structural diagram of the adjustment component of this utility model.

[0023] Figure 4 This is a partial structural diagram of the positioning base cross-section.

[0024] Figure 5 This is a schematic diagram of the probe assembly structure.

[0025] Figure 6 This is a schematic diagram of the cross-sectional structure of the probe assembly.

[0026] In the diagram: 1. Lithium battery; 2. Positioning base; 21. Needle cavity; 22. Upper baffle; 23. Lower baffle; 231. Cavity; 24. Positioning needle; 241. Sealing block; 25. Return spring; 26. Airlock valve; 3. Probe assembly; 31. Probe box; 32. Adjusting gear; 321. Adjusting rod; 322. Rotating handle; 33. Cantilever; 331. Horizontal rack; 34. Probe fixing plate; 35. Probe; 4. Adjusting assembly; 40. Support column; 401. Vertical rack; 402. Snap-fit ​​groove; 41. Rotating base; 42. Lifting frame; 421. Rotating gear; 422. Rotating rod; 423. Rotating handwheel; 43. Linkage arm one; 44. Linkage arm two; 45. Linkage arm three; 46. Adjusting cylinder; 5. Locking screw. Detailed Implementation

[0027] The technical solution of this utility model will now be clearly and completely described with reference to specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0028] Examples, such as Figure 1 , Figure 2As shown, a multi-model lithium battery EOL testing fixture includes a positioning base 2, a support column 40 disposed on the positioning base 2, and a probe assembly 3 movably disposed on the support column 40. The positioning base 2 is provided with a plurality of positioning pins 24 and a plurality of needle cavities 21 for vertical movement of the positioning pins 24. A return spring 25 is disposed below the positioning pins 24, and a lower baffle 23 is disposed below the positioning base 2. The lower end of the return spring 25 is fixedly connected to the lower baffle 23, and the return spring 25 is axially movably disposed within the needle cavity 21.

[0029] This invention enables precise positioning of each lithium battery 1 in the same batch without multiple position adjustments, and can also fix the positioning of lithium batteries 1 in different batches and models.

[0030] like Figure 2 , Figure 4 As shown, a sealed cavity 231 is provided between the lower baffle 23 and the positioning base 2. An airlock valve 26 is provided on the positioning base 2, which controls whether the cavity 231 is connected to or blocked from the outside. A sealing block 241 is provided below the positioning needle 24. The sealing block 241 is slidably disposed in the needle cavity 21 and connected to the return spring 25.

[0031] Several flexible positioning pins 24 are provided on the positioning base 2 to provide positioning for various types of lithium batteries 1. Below the positioning pins 24 on the positioning base 2 is a 2mm upper baffle 22, which restricts the movement of the positioning pins 24 within the pin cavity 21. Below the flexible positioning pins 24 is a return spring 25 to provide elastic force for the flexible positioning pins 24 to return to their original position. Below the positioning base 2 is a lower baffle 23, and there is a sealed cavity 231 between the lower baffle 23 and the positioning base 2. An airlock valve 26 is installed on the positioning base 2. When the lithium battery 1 is positioned on the positioning pins 24, the positioning pins 24 compress the springs, and the pin plate on the positioning base 2 will show the positioning shape of the lithium battery 1. To avoid repeated positioning, the airlock valve 26 is opened to cut off the gas flow between the cavity 231 and the outside. Since the cavity 231 is a sealed space, after a lithium battery 1 is processed and removed, the pin plate on the positioning base 2 will show the positioning shape of the lithium battery 1. The next time, only the lithium battery 1 needs to be placed into this shape.

[0032] like Figure 5 , Figure 6As shown, the probe assembly 3 includes a probe box 31, an adjusting gear 32, a cantilever 33, a probe fixing plate 34, and a probe 35. An adjusting assembly 4 is provided between the probe box 31 and the support column 40. Two cantilever 33s are provided, which are slidably connected in opposite directions within the probe box 31. The adjusting gear 32 is rotatably connected within the probe box 31. A horizontal rack 331 is provided at one end of each cantilever 33 near the gear. The horizontal rack 331 on each cantilever 33 meshes with the upper and lower sides of the adjusting gear 32, respectively. The probe fixing plate 34 is located at the end of the cantilever 33, and the probe 35 is located at the lower end of the probe fixing plate 34.

[0033] like Figure 5 , Figure 6 As shown, an adjusting rod 321 is coaxially fixedly connected to the adjusting gear 32. The adjusting rod 321 is rotatably connected inside the probe box 31 and extends out of the probe box 31 and is connected to a rotating handle 322. When it is necessary to adjust the distance between the two probes 35, the rotating handle 322 rotates to drive the adjusting rod 321 to rotate. The rotating rod 321 drives the adjusting gear 32 to rotate. During the rotation of the adjusting gear 32, it will drive the horizontal rack 331 to make the two cantilever 33 move closer or further apart. This can be applied to the electrode spacing of various lithium battery models to achieve compatibility. Three probes 35 are installed under each probe fixing plate 34. After docking with the lithium battery electrode, the electrode test signal is transmitted to the EOL tester.

[0034] like Figure 2 , Figure 3 As shown, the adjustment assembly 4 includes a rotating base 41, a lifting frame 42, a connecting rod, and a lifting component. The rotating base 41 is rotatably connected to the positioning base 2. The lower end of the support column 40 is fixedly connected to the rotating base 41. A lifting component is provided between the lifting frame 42 and the support column 40. The lifting component controls the lifting frame 42 to move up and down along the support column 40. One end of the connecting rod is movably connected to the lifting frame 42, and the other end is connected to the lifting component. The lifting component is connected to the probe box 31 to control the probe box 31 to move up and down.

[0035] like Figure 2 , Figure 3As shown, a vertical rack 401 is provided on the support column 40, and a rotating gear 421 is rotatably connected inside the lifting frame 42, the rotating gear 421 meshing with the rack. A rotating rod 422 is axially fixedly connected to the rotating gear 421, and the rotating rod 422 is rotatably connected to the lifting frame 42. A rotating handwheel 423 is provided at the end of the rotating rod 422. The connecting rod includes a first connecting arm 43 and a second connecting arm 44. One end of the first connecting arm 43 is hinged to the lifting frame 42, and the other end is hinged to the second connecting arm 44. The other end of the second connecting arm 44 is hinged to a third connecting arm 45, and the other end of the third connecting arm 45 is hinged to the lifting component. The lifting component is an adjusting cylinder 46, and the piston end of the adjusting cylinder 46 is fixedly connected to the probe box 31. Locking screws 5 are provided between the first connecting arm 43 and the lifting frame 42, between the first connecting arm 43 and the second connecting arm 44, and between the rotating base 41 and the positioning base 2.

[0036] The rotating base 41 below the support column 40 is rotatably connected to the positioning base 2, controlling the probe assembly 3 to rotate around the support column 40. Simultaneously, several threaded holes are provided between the rotating base 41 and the positioning base 2. The rotating base 41 is threadedly fixed to the positioning base 2 by a locking screw 5 for limiting its position, and can be rotated and adjusted before being fixed again. A vertical rack 401 is provided on the support column 40. A rotating rod 422 and a rotating gear 421 are rotatably connected inside the lifting frame 42. The rotating gear 421 meshes with the vertical rack 401. When the handwheel 423 rotates, driving the rotating gear 421 to rotate, the lifting frame 42 can be raised and lowered, further driving the probe box 31 to rise and fall. When the lifting frame 42 moves to the appropriate position, the outer surface of the support column 40 has an axially formed locking groove 402. A corresponding threaded hole is provided on the lifting frame 42, and the locking screw 5 passes through the threaded hole on the lifting frame 42. The threaded hole engages with the locking groove 402 of the support column 40 to achieve height positioning of the lifting frame 42. The first connecting arm 43 is hinged to the lifting frame 42, and a threaded hole is provided at the hinge of the lifting frame 42. The locking screw 5 passes through the threaded hole and engages with the connecting arm for fixation. The first connecting arm 43 and the second connecting arm 44 are hinged, and a threaded hole is provided on the first connecting arm 43. The locking screw 5 is threaded through the first connecting arm 43 and engages with the second connecting arm 44 for fixation. A threaded hole is provided on the second connecting rod arm 44. The locking screw 5 is threaded through the second connecting rod arm 44 and abuts against the third connecting rod arm 45 for fixation. The arrangement of the first connecting rod arm 43, the second connecting rod arm 44 and the third connecting rod arm 45 can provide adjustment and fixation at any height position. The end of the third connecting rod arm 45 is connected to an adjusting cylinder 46. The piston end of the adjusting cylinder 46 is fixedly connected to the probe box 31 to provide up and down force when the probe 35 presses down to perform EOL testing on the lithium battery 1.

[0037] Working principle: Before the first production run, the lithium battery 1EOL testing fixture needs to be adjusted according to the battery cell. The lithium battery 1 to be tested is placed above the flexible positioning pin 24 of the positioning base 2. Pressing the lithium battery 1 compresses the position where it is placed downwards. At this time, the flexible positioning pin 24 at the contact position with the lithium battery 1 will be compressed, forming a concave indentation. At this time, the air lock valve 26 cuts off the gas flow between the cavity 231 and the outside. Since the cavity 231 is a sealed vacuum chamber, the positioning effect is achieved. The working height of the fixture is adjusted by adjusting component 4, and then the angles of connecting arm 1 43, connecting arm 2 44 and connecting arm 3 45 are adjusted and then locked with screws. The rod 5 is fixed. This method of adjustment can adapt to the measurement position of various types of lithium batteries 1. By adjusting the position of the two cantilever 33 of the probe box 31, the spacing of the terminals of various lithium batteries 1 can be adapted. After the position is adjusted, the probe 35 interface cable is connected to the EOL tester, and the adjusting cylinder 46 is connected to the air source and controller. The tooling can then be used for production. After testing one lithium battery 1, the next lithium battery 1 can be directly placed in the recess of the flexible positioning pin 24 of the positioning base 2. It can achieve precise positioning for each lithium battery 1 in the same batch without multiple position adjustments, and can also limit and fix lithium batteries 1 of different batches and models.

Claims

1. A multi-model lithium battery EOL test tooling, comprising a positioning base (2), a support column (40) arranged on the positioning base (2), and a probe assembly (3) movably arranged on the support column (40), characterized in that: The positioning base (2) is provided with a plurality of positioning pins (24), and the positioning base (2) is provided with a plurality of pin cavities (21) for the vertical movement of the positioning pins (24). A return spring (25) is provided below the positioning pins (24), and a lower baffle (23) is provided below the positioning base (2). The lower end of the return spring (25) is fixedly connected to the lower baffle (23), and the return spring (25) is axially movable in the pin cavity (21).

2. The multi-model lithium battery EOL test tooling of claim 1, wherein: A sealed cavity (231) is provided between the lower baffle (23) and the positioning base (2). An airlock valve (26) is provided on the positioning base (2). The airlock valve (26) controls the cavity (231) to communicate with or block the outside world.

3. The multi-model lithium battery EOL test tooling of claim 1, wherein: A sealing block (241) is provided below the positioning pin (24), and the sealing block (241) is slidably disposed in the pin cavity (21) and connected to the reset spring (25).

4. The multi-model lithium battery EOL test tooling of claim 3, wherein: The probe assembly (3) includes a probe box (31), an adjusting gear (32), a cantilever (33), a probe fixing plate (34), and a probe (35). An adjusting assembly (4) is provided between the probe box (31) and the support column (40). Two cantilever arms (33) are provided, and the two cantilever arms (33) are slidably connected in opposite directions within the probe box (31). The adjusting gear (32) is rotatably connected within the probe box (31). A horizontal rack (331) is provided at one end of the two cantilever arms (33) near the gear. The horizontal racks (331) on the two cantilever arms (33) mesh with the upper and lower sides of the adjusting gear (32) respectively. The probe fixing plate (34) is provided at the end of the cantilever arm (33), and the probe (35) is provided at the lower end of the probe fixing plate (34).

5. The multi-model lithium battery EOL test tooling of claim 4, wherein: The adjustment assembly (4) includes a rotating base (41), a lifting frame (42), a connecting rod, and a lifting component. The rotating base (41) is rotatably connected to the positioning base (2). The lower end of the support column (40) is fixedly connected to the rotating base (41). A lifting component is provided between the lifting frame (42) and the support column (40). The lifting component controls the lifting frame (42) to move up and down along the support column (40). One end of the connecting rod is movably connected to the lifting frame (42), and the other end is connected to the lifting component. The lifting component is connected to the probe box (31) to control the probe box (31) to move up and down.

6. The multi-model lithium battery EOL testing fixture according to claim 5, characterized in that: A vertical rack (401) is provided on the support column (40), and a rotating gear (421) is rotatably connected inside the lifting frame (42), and the rotating gear (421) meshes with the rack.

7. The multi-model lithium battery EOL test tooling of claim 6, wherein: The rotating gear (421) is axially fixedly connected to a rotating rod (422), which is rotatably connected to the lifting frame (42). A rotating handwheel (423) is provided at the end of the rotating rod (422).

8. The multi-model lithium battery EOL test tooling of claim 7, wherein: The linkage includes a first linkage arm (43), a second linkage arm (44), and a third linkage arm (45). One end of the first linkage arm (43) is hinged to the lifting frame (42), and the other end is hinged to the second linkage arm (44). The other end of the second linkage arm (44) is hinged to the third linkage arm (45), and the other end of the third linkage arm (45) is hinged to the lifting component.

9. The multi-model lithium battery EOL test tooling of claim 5, wherein: The lifting component is an adjusting cylinder (46), and the piston end of the adjusting cylinder (46) is fixedly connected to the probe box (31).

10. The multi-model lithium battery EOL test tooling of claim 8, wherein: Locking screws (5) are provided between the first connecting arm (43) and the lifting frame (42), between the first connecting arm (43) and the second connecting arm (44), and between the rotating base (41) and the positioning base (2).

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