Battery expansion testing device

Abstract

A battery expansion testing device disclosed by the present invention comprises a testboard, a clamping mechanism and expansion detection mechanisms, the expansion detection mechanisms are arranged on the testboard and located at two sides of the clamping mechanism, each expansion detection mechanism comprises a frame plate and a plurality of testing assemblies, each testing assembly comprises a guide column and an indication sleeve, the guide columns are in sliding fit with the frame plate, and the indication sleeves are arranged on the guide columns. A spring is arranged between the guide column and the frame plate, the guide column slides away from or close to the clamping mechanism, the indicating sleeve is fixedly connected with the frame plate, the guide column and the indicating sleeve are provided with a graduated scale for determining the distance according to the relative position of the guide column and the indicating sleeve, and the end, facing the clamping mechanism, of the guide column is provided with a marking liquid outlet. When the marking liquid outlet is in contact with the surface of the battery, marking liquid forms a mark on the surface of the battery. According to the invention, battery expansion detection positions can be marked, so that different expansion degrees of different positions of the battery can be visually confirmed.

Description

Technical Field

[0001] The invention relates to a battery expansion testing device, belonging to the technical field of battery thickness measurement. Background Art

[0002] During the use of the battery, as the charge and discharge are continuously carried out, the interface film of the solid electrolyte in the battery cell will continue to thicken, the material expansion rate will increase, and the electrolyte will continue to decompose and produce gas, which will cause the internal pressure of the battery cell to continue to increase, causing the battery cell to expand to a certain extent, thus causing the entire battery to swell, which has a great negative impact on the battery life. In the battery testing project, the expansion force during the charge and discharge process is an extremely critical indicator. In order to ensure the safety of the battery, the study of battery expansion force has always been an important part of battery safety research.

[0003] Existing battery expansion testing devices can perform multi-point tests on batteries to obtain the expansion conditions of different positions of the battery. However, it is difficult to intuitively correspond the test results of each point with the specific detection position on the battery, making it inconvenient to intuitively judge the battery expansion and test results based on the expanded shape of the battery. Summary of the invention

[0004] In view of the above-mentioned defects of the prior art, the present invention provides a battery expansion testing device, which aims to solve the problem that the test position cannot be visually observed on the battery to determine the relationship between battery expansion and internal structure.

[0005] The technical solution of the present invention is as follows: A battery expansion test device comprises a test bench, a clamping mechanism and an expansion detection mechanism, wherein the expansion detection mechanism is arranged on the test bench and located on both sides of the clamping mechanism, the expansion detection mechanism comprises a frame plate and a plurality of test components, the test components comprise a guide column and an indicator sleeve, the guide column is slidably matched with the frame plate, a spring is arranged between the guide column and the frame plate, the sliding direction of the guide column is away from or close to the clamping mechanism, the indicator sleeve is fixedly connected to the frame plate, the guide column and the indicator sleeve are provided with a scale for determining the distance by the relative position of the guide column and the indicator sleeve, and a marking liquid outlet is arranged at one end of the guide column facing the clamping mechanism, and when the marking liquid outlet contacts the battery surface, a mark is formed on the battery surface by the marking liquid.

[0006] Furthermore, the head end of the guide post is conical, and the marking liquid outlet is located at the head end of the cone. The battery contacts the guide post through the marking liquid outlet, and the position of the battery detection deformation can be marked more accurately.

[0007] Further, the expansion detection mechanism includes a liquid injection assembly, the liquid injection assembly includes a marking liquid box, the marking liquid box is provided with an injection cylinder, the injection cylinder is communicated with the inner cavity of the marking liquid box, the top of the injection cylinder is provided with an end cap, the guide column is provided with a marking liquid cavity communicated with the marking liquid outlet, and the inner cavity of the marking liquid box is communicated with the marking liquid cavity through a hose. The marking liquid can be conveniently provided to the guide columns of each test component through the liquid injection assembly, which is convenient for continuous measurement.

[0008] Furthermore, in order to control the amount of marking liquid out of the marking liquid outlet, a push plate is provided in the marking liquid box, and a sealing ring is provided around the push plate. The push plate cooperates with the marking liquid box to move up and down, and the push plate forms a dynamic seal with the inner wall of the marking liquid box. The injection cylinder is fixedly connected to the push plate.

[0009] Furthermore, the test components are distributed on the frame plate in a row and column matrix.

[0010] Furthermore, the test bench is provided with a guide frame, and the frame plate cooperates with the guide frame and moves along the guide frame to approach or move away from the clamping mechanism.

[0011] Furthermore, the clamping mechanism comprises clamping sliders that move closer to or farther from each other, and the clamping sliders are used to clamp the battery when they move closer to each other, and the clamping sliders are slidably disposed on the guide frame.

[0012] Furthermore, the clamping slider is fixedly connected to a guide cylinder, the guide cylinder is slidably matched with the guide frame, the frame plate is rotatably connected to an adjusting screw sleeve, the adjusting screw sleeve is threadedly connected to the guide cylinder, and when the adjusting screw sleeve rotates, the frame plate moves along the guide cylinder.

[0013] Furthermore, the clamping mechanism includes a rotation drive device, a reverse double-threaded rod and two connecting plates, the rotation drive device drives the reverse double-threaded rod to rotate, the two connecting plates are threadedly configured with the reverse double-threaded rod and approach or move away from each other when the reverse double-threaded rod rotates, and the clamping slider is fixedly connected to the connecting plates.

[0014] Furthermore, an L-shaped rubber pad is provided on the clamping slider.

[0015] Compared with the prior art, the advantages of the technical solution provided by the present invention are: The present invention provides a marking liquid outlet at the end of the guide post of the test assembly, and uses the guide post as a force-bearing component for expansion testing. The battery expansion is used to push the guide post, so that a relative position is generated between the guide post and the indicator sleeve to determine the expansion degree and simultaneously complete marking at the corresponding position on the battery surface through the marking liquid outlet. In this way, the expansion position corresponding to different expansion values ​​can be intuitively and accurately determined on the battery surface, and it is also convenient to observe the internal structure corresponding to the expansion test point after disassembling the battery, which provides convenience for studying the relationship between the battery structure and the expansion degree. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of a battery expansion testing device according to an embodiment.

[0017] Figure 2 It is a partial cross-sectional structural schematic diagram of a battery expansion testing device according to an embodiment.

[0018] Figure 3 Schematic diagram of the structure of the clamping mechanism of the embodiment.

[0019] Figure 4 It is a schematic diagram of a single-side partial structure of the clamping mechanism of the embodiment.

[0020] Figure 5 Schematic diagram of the structure of the expansion detection mechanism of the embodiment.

[0021] Figure 6 It is a schematic diagram of the cross-section structure of the expansion detection mechanism of the embodiment.

[0022] Figure 7 Schematic diagram of the cutaway structure of the frame plate of the embodiment.

[0023] Figure 8 for Figure 6 Enlarged structural diagram at A in the middle.

[0024] Fig. 9 It is a schematic diagram of the structure of the test component of the embodiment.

[0025] Fig.10 Schematic diagram of the cross-section structure of the test assembly of the embodiment. DETAILED DESCRIPTION

[0026] The present invention is further described below in conjunction with examples. It should be understood that these examples are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading this description, various equivalent modifications to this description by those skilled in the art fall within the scope defined by the claims attached to this application.

[0027] Please combine Figure 1 , Figure 2As shown, the battery expansion test device of this embodiment includes a test bench 1, a clamping mechanism 3 and an expansion detection mechanism 4. Concave grooves 2 are provided on both sides of the test bench 1. The clamping mechanism 3 and the expansion detection mechanism 4 are installed on the test bench 1. The concave grooves 2 provide a moving space for the clamping slider 34 in the clamping mechanism 3. The clamping mechanism 3 is used to install and clamp the battery 5 to be tested in the middle of the test bench 1.

[0028] Please combine again Figure 3 , Figure 4 As shown, the clamping mechanism 3 specifically includes a motor 31, a reverse double-threaded rod 32, a connecting plate 33, a clamping slider 34 and two guide frames 39. The motor 31 is fixedly installed on one side of the test bench 1. The output shaft of the motor 31 is fixedly connected to the reverse double-threaded rod 32. The threads of the reverse double-threaded rod 32 are connected to two connecting plates 33. The reverse double-threaded rod 32 and the connecting plate 33 are both located at the bottom of the test bench 1, wherein a part of the connecting plate 33 extends upward from the concave groove 2. The top of the front and rear ends of each connecting plate 33 is fixedly installed with a clamping slider 34. The two guide frames 39 are in an arched shape. The guide frames 39 are fixedly installed at the front and rear sides of the upper surface of the test bench 1. The clamping slider 34 is slidably matched with the guide frame 39. The end of the clamping slider 34 close to the guide frame 39 is fixedly connected with a guide cylinder 36 that is movably sleeved with the guide frame 39, that is, the guide cylinder 36 and the guide frame 39 are also slidably matched. The clamping slider 34 is also equipped with two L-shaped rubber pads 35 distributed up and down.

[0029] When the motor 31 rotates, it drives the reverse double-threaded rod 32 to rotate, so that the two connecting plates 33 on the reverse double-threaded rod 32 move relative to each other (that is, move closer to or farther away from each other), and the connecting plates 33 drive the clamping slider 34 to move relative to each other. When the clamping sliders 34 of the two connecting plates 33 approach each other, the battery 5 is clamped by the corner position of the L-shaped rubber pad 35 corresponding to the side of the battery. The L-shaped rubber pad 35 can play a buffering role to avoid accidental damage to the battery 35 and stabilize the clamping.

[0030] Please further combine Figures 5 to 10As shown, the expansion detection mechanism 4 includes a frame plate 41 and a test assembly 43, and the test assembly 43 has a plurality of them and is installed on the frame plate 41. In this embodiment, fifteen slide grooves 44 arranged in rows and columns are provided in the middle of the frame plate 41, and each slide groove 44 is used to install a test assembly 43, so that the guide column 432 in the test assembly 43 can slide along the slide groove 44, and its sliding direction is close to or away from the two side surfaces of the battery clamped by the clamping mechanism 3. The two ends of the frame plate 41 are fixed with mounting plates 37, and the mounting plates 37 are rotatably provided with an adjusting screw sleeve 38, which is sleeved on the guide cylinder 36, and the guide cylinder 36 is provided with a thread matching the adjusting screw sleeve 38, and the relative position between the frame plate 41 and the clamping slider 34 can be adjusted by rotating the adjusting screw sleeve 38. That is to say, when the clamping slider 34 moves to clamp the battery 5, the frame plate 41 will drive the test component 43 to move toward the battery 5. The middle thickness of the battery 5 may be different. The position of the expansion detection mechanism 4 is further adjusted by rotating the adjusting screw sleeve 38 so that the test component 43 can contact the surface of the battery 5, thereby completing the expansion test and marking the surface of the battery 5.

[0031] Each test assembly 43 mainly includes a guide column 432 and an indicator sleeve 431. The indicator sleeve 431 is fixedly connected to the frame plate 41 at a position where the slide slot 44 is set on the frame plate 41. The guide column 432 slidably set in the slide slot 44 changes its relative position with the indicator sleeve 431 when moving. Three springs 434 are respectively set on the circumference of the guide column 432. One end of the spring 434 is fixedly connected to the mounting block 433 on the side of the guide column 432, and the other end is fixed to the side of the frame plate 41 away from the clamping mechanism 3. When the battery 5 clamped on the clamping mechanism 3 expands, it will push the guide column 432 to move along the slide slot 44 and compress the spring 434. In some embodiments, the guide column 432 can also be installed by using a structure in which the spring 434 is sleeved on the guide column 432. A marking liquid chamber 436 is provided at one end of the guide post 432 close to the clamping mechanism 3. The marking liquid chamber 436 is used to fill the marking liquid (ink). A marking liquid outlet is provided at one end of the guide post 432 close to the clamping mechanism 3. The marking liquid in the marking liquid chamber 436 flows out from the marking liquid outlet. During the battery expansion test, the head end of the guide post 432 contacts the side surface of the battery, and the marking liquid flowing out of the marking liquid outlet leaves a mark on the side surface of the battery. In this embodiment, the head end of the guide post 432 is set to be conical, and the marking liquid outlet is located at the head end of the cone. The marking liquid outlet is provided with a ball head 435, which constitutes a pen head structure of a ballpoint pen.

[0032] Please combine Figure 6 , Figure 8As shown, as a preferred embodiment, in this embodiment, in order to well control the liquid output of the marking liquid outlet and facilitate filling the marking liquid into the marking liquid cavity 436 of the supplementary guide column 432. A liquid injection assembly 42 is fixedly installed on the top of the frame plate 41. The liquid injection assembly 42 includes a marking liquid tank 421, the bottom of which is fixedly installed on the top of the frame plate 41, and an exhaust port 422 is provided on the upper surface of the marking liquid tank 421. The inner cavity of the marking liquid tank 421 is used to store the marking liquid. The inner cavity of the marking liquid tank 421 is provided with a push plate 426 that can move up and down, and a rubber ring 427 is provided around the push plate 426 as a sealing ring, so that the peripheral side of the push plate 426 forms a seal with the inner wall of the marking liquid tank 421, and the bottom of the inner cavity of the marking liquid tank 421 is connected to one end of a rubber tube 428, and the other end of the rubber tube 428 is respectively connected to the marking liquid cavity 436 of the guide column 432 of each test component 43. An injection cylinder 425 is provided at the middle position of the top of the marking liquid tank 421. The top of the injection cylinder 425 is threadedly connected with an end cap 423. The bottom of the injection cylinder 425 is connected to the push plate 426. The injection cylinder 425 is communicated with the inner cavity of the marking liquid tank 421 below the push plate 426. When in use, it is only necessary to open the end cap 423 to replenish the marking liquid into the marking liquid tank 421 through the top of the injection cylinder 425. The exhaust port 422 is provided to allow air to enter and exit the marking liquid tank 421 when the push plate 426 moves. That is, when the push plate 426 is pulled up, the air at the top of the marking liquid tank 421 can be discharged from the position of the exhaust port 422. When marking, the push plate 426 is pushed down, and the marking liquid can be discharged from the marking liquid outlet at the front end of the guide column 432 by relying on the pressure applied to the push plate 426, so as to perform marking. In this embodiment, a counterweight 424 is detachably installed at a position near the top of the outer wall of the injection cylinder 425, and the push plate 426 is pressurized by the counterweight 424.

[0033] In order to facilitate determination of the expansion of the battery 5 at different positions and to facilitate adjustment of the position of the test assembly 43, scale marks 6 for matching indication are provided on the upper side of the outer wall of the guide cylinder 36, the left and right positions of the upper surface of the guide frame 39, the upper side of the outer surface of the guide column 432, and the inclined surface of the upper side of the indicator sleeve 431. The scale marks 6 include a ruler and an indicator mark. The guide column 432 and the indicator sleeve 431 are combined to form a set of scale marks 6 for indicating the expansion value of the battery 5, the guide cylinder 36 and the guide frame 39 are combined to form a set of scale marks 6 for indicating the distance between the clamping slider 34, and the adjusting screw sleeve 38 and the guide cylinder 36 are combined to form a set of scale marks 6 for indicating the distance between the frame plate 41 and the clamping slider 34.

[0034] The working process of the battery expansion test device of this embodiment is as follows: the battery 5 is placed in the middle position of the upper surface of the test bench 1, the motor 31 is started, the battery 5 is clamped by the clamping mechanism 3, and the position of the expansion detection mechanism 4 is adjusted by screwing the adjusting screw sleeve 38 so that the head end of each guide column 432 contacts the side surface of the battery 5. Then the push plate 426 is pushed to discharge the marking liquid from the marking liquid outlet at the front end of the guide column 432, and the detection position of the battery 5 is marked. Then the battery 5 is subjected to an expansion test, and the expansion of the battery 5 will push each guide column 432 to move, thereby changing the relative position of the guide column 432 and the indicator sleeve 431. The value of the battery expansion can be determined by the scale marks 6 formed on each guide column 432 and the indicator sleeve 431, and the marking on the side surface of the battery 5 can facilitate the positioning of the expansion position of the battery 5.

Claims

1. A battery expansion test device, comprising a test bench, a clamping mechanism and an expansion detection mechanism, characterized in that: The expansion detection mechanism is arranged on the test bench and located on both sides of the clamping mechanism. The expansion detection mechanism includes a frame plate and a plurality of test components. The test components include a guide column and an indicator sleeve. The guide column is slidably matched with the frame plate. A spring is provided between the guide column and the frame plate. The sliding direction of the guide column is away from or close to the clamping mechanism. The indicator sleeve is fixedly connected to the frame plate. The guide column and the indicator sleeve are provided with a scale for determining the distance through the relative position of the guide column and the indicator sleeve. A marking liquid outlet is provided at one end of the guide column facing the clamping mechanism. When the marking liquid outlet contacts the battery surface, a mark is formed on the battery surface by the marking liquid.

2. The battery expansion testing device according to claim 1, characterized in that: The head end of the guide column is conical, and the marking liquid outlet is located at the head end of the cone.

3. The battery expansion testing device according to claim 1, characterized in that: The expansion detection mechanism includes an injection component, which includes a marking liquid tank. The marking liquid tank is provided with an injection cylinder, and the injection cylinder is communicated with the inner cavity of the marking liquid tank. An end cover is provided on the top of the injection cylinder, and the guide column is provided with a marking liquid cavity communicated with the marking liquid outlet, and the inner cavity of the marking liquid tank is communicated with the marking liquid cavity through a hose.

4. The battery expansion testing device according to claim 3, characterized in that: A push plate is provided in the marking liquid box, and sealing rings are provided around the push plate. The push plate cooperates with the marking liquid box to move up and down, and the push plate forms a dynamic seal with the inner wall of the marking liquid box. The injection cylinder is fixedly connected to the push plate.

5. The battery expansion testing device according to claim 1, characterized in that: The test components are distributed on the frame plate in a matrix of rows and columns.

6. The battery expansion testing device according to claim 1, characterized in that: The test bench is provided with a guide frame, and the frame plate cooperates with the guide frame and moves along the guide frame to approach or move away from the clamping mechanism.

7. The battery expansion testing device according to claim 6, characterized in that: The clamping mechanism comprises clamping sliders which are close to or far away from each other. When the clamping sliders are close to each other, they are used to clamp the battery. The clamping sliders are slidably arranged on the guide frame.

8. The battery expansion testing device according to claim 7, characterized in that: The clamping slide block is fixedly connected with a guide cylinder, and the guide cylinder is slidably matched with the guide frame. The frame plate is rotatably connected with an adjusting screw sleeve, and the adjusting screw sleeve is threadedly connected with the guide cylinder. When the adjusting screw sleeve rotates, the frame plate moves along the guide cylinder.

9. The battery expansion testing device according to claim 7, characterized in that: The clamping mechanism includes a rotation drive device, a reverse double-threaded rod and two connecting plates. The rotation drive device drives the reverse double-threaded rod to rotate. The two connecting plates are threadedly configured with the reverse double-threaded rod and approach or move away from each other when the reverse double-threaded rod rotates. The clamping slider is fixedly connected to the connecting plates.

10. The battery expansion testing device according to claim 6, characterized in that: An L-shaped rubber pad is arranged on the clamping slide block.

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