Expansion force testing tool for cylindrical battery cell

Abstract

The utility model relates to the technical field of battery cell testing, in particular to an expansive force testing tool for a cylindrical battery cell. The device comprises a base, the top of the base is provided with a station platform and a battery cell fixing seat capable of rotating around a vertical axis, a pressing plate is arranged right above the station platform, and the pressing plate is driven by a straight stroke elastic mechanism and generates radial horizontal displacement action towards the station platform. A pressure sensor is arranged between the pressing plate and the advancing end of the straight stroke elastic mechanism, a pressing part is formed by the side, close to the vertical axis of the station platform, of the pressing plate, and the appearance of the pressing part is matched with the outer contour of a battery cell. The utility model provides a tool for testing the expansibility of a cylindrical battery cell, which can detect the expansibility of the periphery of the battery cell in all directions, avoid detection dead angles and ensure the accuracy of testing the expansibility of the battery cell.

Description

Technical Field

[0001] The utility model relates to the technical field of battery core testing, in particular to an expansion force testing tool for a cylindrical battery core. Background Art

[0002] During the production process of lithium batteries, it is necessary to perform charge and discharge tests on lithium batteries. During the charge and discharge process of lithium-ion batteries, the embedding and extraction of lithium ions in the electrode active materials will cause the battery to expand and contract. In order to find suitable pressure-resistant materials and study the changes in the expansion force of the battery cells during charge and discharge, it is necessary to measure the expansion force of the battery cells.

[0003] In actual use, the existing battery cell testing tooling generally adopts the method of clamping the battery cell to detect the expansion force of the battery cell. For example, as described in the text of the battery cell expansion force testing tooling with the Chinese patent publication number CN116577008A, a number of clamping plates are set on the periphery of the battery cell to detect the expansion force of the battery cell in all directions. In actual implementation, in order to prevent the activity interference between adjacent clamping plates, a certain interval is reserved between each clamping plate. The setting of this interval results in a large number of detection blind spots when detecting the battery cell, resulting in the battery cell expansion force test being not accurate enough, so it is urgent to solve it. Utility Model Content

[0004] In order to avoid and overcome the technical problems existing in the prior art, the utility model provides an expansion force testing tool for a cylindrical battery cell, which can fully detect the expansion force of the battery cell periphery, avoid leaving blind spots in detection, and ensure the accuracy of the battery cell expansion force test.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A tool for testing expansion force of a cylindrical battery cell comprises a base, a battery cell fixing seat with a work station platform rotatable around a vertical axis is installed on the top of the base, a pressure plate is arranged directly above the work station platform, the pressure plate is driven by a linear elastic mechanism and produces a radial horizontal displacement toward the work station platform, and a pressure sensor is arranged between the pressure plate and the travel end of the linear elastic mechanism, a clamping portion is formed by one side of the pressure plate close to the vertical axis of the work station platform, and the shape of the clamping portion matches the outer contour of the battery cell.

[0007] As a further solution of the utility model: the pressing plates are a plurality of pressing plates evenly spaced circumferentially around the vertical axis of the workstation platform, and a power component for driving all the pressing plates to expand outward is also provided on the base.

[0008] As a further solution of the utility model: the power assembly includes an airbag ring coaxially arranged with the vertical axis of the workstation platform, the airbag ring is inflated and exhausted by an air pump, and the bottom of each pressure plate is fixedly connected to a connecting buckle fixed to the outer periphery of the airbag ring.

[0009] As a further solution of the utility model: the straight-stroke elastic mechanism includes a telescopic rod extending horizontally in the length direction toward the vertical axis of the work station platform, the telescopic rod is provided with an extrusion spring for pushing the pressure plate to elastically move, a fixed ring frame coaxially distributed with the vertical axis of the work station platform is fixed on the base, the pressure plate is distributed in the inner cavity of the fixed ring frame, and the fixed end of the telescopic rod is fixedly connected to the fixed ring frame.

[0010] As a further solution of the utility model: the battery cell fixing seat includes a rotating support ring fixed on the top of the base in a bracket-like manner, the axis of the rotating support ring is distributed vertically, and a rotating gear ring is coaxially rotated on the top of the rotating support ring, and the top surface of the rotating gear ring constitutes the work station platform.

[0011] As a further solution of the utility model: a driving motor is installed on the base, the output shaft of the driving motor is distributed along the vertical direction, and a driving gear meshing with the rotating gear ring is coaxially fixed on the output shaft of the driving motor.

[0012] As a further solution of the utility model: a suction cup for adsorbing and fixing the battery core is installed on the top surface of the rotating gear ring.

[0013] As a further solution of the utility model: the pressure plate is composed of a fixed plate and a movable plate that can be detachably assembled, and the fixed plate is connected to the travel end of the linear elastic mechanism, and the inner plate surface of the movable plate constitutes a clamping portion.

[0014] As a further solution of the utility model: the top of the fixed plate is provided with positioning holes distributed along the vertical direction, and the movable plate is provided with positioning rods that are plugged and matched with the positioning holes.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] 1. By installing the battery cell on the work platform of the battery cell fixing seat, when the battery cell is energized to expand, the pressure detection component detects the pressure change on the side where the battery cell and the pressure detection component are elastically pressed together. Thereafter, the expanded part of the battery cell shrinks after the power is turned off, and the battery cell is driven to rotate by the work platform so that the undetected part on the outer surface of the battery cell is detected again; by repeating the above operation, the periphery of the battery cell can be detected, avoiding the detection blind spots left when detecting the battery cell, thereby ensuring the accuracy of the battery cell expansion force test.

[0017] 2. The pressure plates are arranged to be evenly spaced around the vertical axis of the workstation platform, so that multiple parts of the periphery of the battery cell can be tested simultaneously, which improves the efficiency of the battery cell expansion force test. In addition, a power component is provided on the base to drive all the pressure plates to expand outward. After that, the battery cell is rotated, which can effectively reduce the friction resistance of the battery cell rotation; and after the pressure plates are expanded outward, it is also convenient to install the battery cell on the workstation platform.

[0018] 3. When the power mechanism drives the pressure plate to expand outward, the air pump inflates the airbag ring, causing the airbag ring to expand and squeeze the connecting buckle, thereby squeezing all the pressure plates to expand outward; and when all the pressure plates shrink inward, the airbag ring can be exhausted, which effectively improves the convenience and efficiency of driving the pressure plates.

[0019] 4. The linear elastic mechanism includes a telescopic rod extending horizontally in the length direction toward the vertical axis of the workstation platform. The telescopic rod keeps the pressure plate moving stably along a straight line trajectory. An extrusion spring is provided on the telescopic rod to promote the elastic movement of the pressure plate, thereby ensuring stable elastic extrusion of the pressure plate.

[0020] 5. The battery cell holder includes a swivel support ring fixed on the top of the base in a bracket-like manner, and the axis of the swivel support ring is distributed along the vertical direction, so that installation space for battery cell wiring is reserved at the bottom and middle of the base. A swivel gear ring rotates coaxially on the top of the swivel support ring, and the top surface of the swivel gear ring constitutes a workstation platform, so that the workstation platform has an internal hollow structure, which is convenient for connecting the battery cell in the middle of the workstation platform.

[0021] 6. A driving motor is used to drive the driving gear to mesh with the rotating gear ring at the side, which does not occupy the inner space of the rotating gear ring, and thus does not hinder the distribution of the wires on the inner side of the rotating gear ring.

[0022] 7. A suction cup is provided on the top surface of the rotating gear ring to facilitate the stable fixing of the battery cell on the top surface of the rotating gear ring 62.

[0023] 8. The pressure plate is composed of a fixed plate and a movable plate that can be detachably assembled. When testing cells of different diameters or heights, the movable plate can be replaced so that the inner plate surface of the replaced movable plate is adapted to the outer contour of the cell, which can be suitable for testing cells of different diameters or heights.

[0024] 9. The disassembly and assembly method of the fixed plate and the movable plate is that positioning holes distributed along the plumb direction are set on the top of the fixed plate, and positioning rods that are plugged into the positioning holes are set on the movable plate. When assembled and installed, the positioning rods are plugged into the positioning holes on the top of the fixed plate from top to bottom through the movable plate. When disassembling, you only need to slide the movable plate upwards, which ensures the convenience of disassembly and assembly of the fixed plate and the movable plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1It is a schematic diagram of the distribution structure of the battery cell fixing seat and the pressing plate in the utility model.

[0026] Figure 2 It is a structural schematic diagram of the utility model.

[0027] Figure 3 It is a structural schematic diagram of the medium pressure plate of the utility model.

[0028] Figure 4 It is a structural schematic diagram of the rotary gear ring in the utility model.

[0029] In the figure: 10, base; 20, fixed ring frame; 30, telescopic rod; 31, extrusion spring; 32, pressure sensor; 40, pressure plate; 41, fixed plate; 411, positioning hole; 42, movable plate; 421, positioning rod; 51, air pump; 52, airbag ring; 53, connecting buckle; 61, slewing support ring; 62, slewing gear ring; 63, suction cup; 71, driving motor; 72, driving gear. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] For ease of understanding, the specific structure and working mode of the utility model are further described below in conjunction with the accompanying drawings:

[0032] The specific structure of the utility model refers to Figure 1-3As shown, its main structure includes a base 10, a cell holder whose workstation platform can rotate around a vertical axis, and a pressure detection component that elastically presses the cell. By installing the cell on the workstation platform of the cell holder, when the cell is energized to expand, the pressure detection component detects the pressure change on the side where the cell and the pressure detection component are elastically pressed against each other. After that, the expanded part of the cell shrinks after the power is turned off, and the cell is driven to rotate by the workstation platform, so that the undetected part on the outer surface of the cell is detected again; the above operation is repeated to detect the periphery of the cell, avoiding the detection blind spots left when detecting the cell, thereby ensuring the accuracy of the cell expansion force test. Specifically, the pressure detection component includes a pressure plate 40 arranged directly above the work station platform. The pressure plate 40 is driven by a linear elastic mechanism and produces a radial horizontal displacement movement toward the work station platform, so that when the battery cell expands, the pressure plate 40 can be squeezed to slide elastically, thereby preventing the pressure plate 40 from hindering the expansion of the battery cell; a pressure sensor 32 is provided between the pressure plate 40 and the traveling end of the linear elastic mechanism, and the pressure sensor 32 can be used to detect the change in the extrusion pressure between the pressure plate 40 and the linear elastic mechanism after the battery cell expands. The clamping part is formed by one side of the pressure plate 40 close to the vertical axis of the work station platform, and the shape of the clamping part matches the outer contour of the battery cell, thereby ensuring uniform detection of the expansion force on the outer side of the battery cell.

[0033] It is worth mentioning that in order to ensure that the battery cell does not move relative to the workstation platform during the inspection process, various implementation methods can be adopted for the installation of the battery cell on the workstation platform. For heavy-weight battery cells, the friction between the battery cell and the workstation platform can be directly relied on to ensure that the battery cell is stably maintained on the workstation platform. For light-weight battery cells, a suction cup (63) for adsorbing and fixing the battery cell can be provided on the workstation platform.

[0034] On the basis of the above, if Figure 2 As shown, the pressing plates 40 are arranged to be evenly spaced around the vertical axis of the workstation platform, so that multiple parts of the periphery of the battery cell can be tested simultaneously, thereby improving the efficiency of the battery cell expansion force test. In addition, a power component is also provided on the base 10 to drive all the pressing plates 40 to expand outwards. After that, the battery cell is rotated, which can effectively reduce the friction resistance of the battery cell rotation; and after the pressing plates 40 are expanded outwards, it is also convenient to install the battery cell on the workstation platform.

[0035] Specifically, Figure 2As shown, the power assembly includes an airbag ring 52 coaxially arranged with the vertical axis of the workstation platform. The airbag ring 52 is inflated and exhausted by an air pump 51. The bottom of each pressing plate 40 is fixedly connected with a connecting buckle 53 fixed to the outer periphery of the airbag ring 52. When in use, the airbag ring 52 is inflated by the air pump 51, so that the airbag ring 52 expands and squeezes the connecting buckle 53, thereby squeezing all the pressing plates 40 to expand outward; and when all the pressing plates 40 shrink inward, the airbag ring 52 is exhausted. Of course, the power assembly can also adopt other embodiments, such as being driven by a cylinder or an electric cylinder, or being driven by a cam rotation, or being driven by an electromagnet adsorption.

[0036] Specifically, Figure 1 As shown, the linear elastic mechanism includes a telescopic rod 30 extending horizontally toward the vertical axis of the workstation platform in the length direction, and the telescopic rod 30 is used to keep the pressure plate 40 moving stably along a straight track. The telescopic rod 30 is provided with an extrusion spring 31 that pushes the pressure plate 40 to move elastically, thereby ensuring stable elastic extrusion of the pressure plate 40. Of course, the linear elastic mechanism can also adopt other embodiments, such as the linear elastic mechanism is set as a slide bar distributed radially along the workstation platform, one end of the slide bar is fixed to the pressure plate 40, and a slide seat is set on the base 10 to ensure that the slide bar slides along its own axis. In addition, a rubber airbag, spring or spring is set to generate an elastic extrusion force on the pressure plate 40, which can also realize the function of extruding the pressure plate 40 toward the vertical axis of the workstation platform. A fixed ring frame 20 is fixed on the base 10 and is coaxially distributed with the vertical axis of the work station platform. The pressure plate 40 is distributed in the inner cavity of the fixed ring frame 20. The fixed end of the telescopic rod 30 is fixedly connected to the fixed ring frame 20. The fixed ring frame 20 can stably fix the telescopic rod 30, and provides an installation platform for several pressure plates 40 that are evenly spaced circumferentially around the vertical axis of the work station platform, thereby facilitating the installation of multiple pressure plates 40.

[0037] In addition, if Figure 1As shown, the battery cell fixing seat includes a swivel support ring 61 fixed on the top of the base 10 in a bracket-like manner, and the axis of the swivel support ring 61 is distributed along the vertical direction, so that the installation space for the battery cell wiring is reserved at the bottom and middle of the base 10. A swivel gear ring 62 rotates coaxially on the top of the swivel support ring 61, and the top surface of the swivel gear ring 62 constitutes a work station platform, so that the work station platform has an internal hollow structure, which is convenient for connecting the battery cell to electricity in the middle of the work station platform. Furthermore, in order to ensure the stability of the battery cell installed on the top surface of the swivel gear ring 62, a suction cup 63 can be provided on the top surface of the swivel gear ring 62, so that the battery cell can be stably fixed on the top surface of the swivel gear ring 62. In specific implementation, the suction cup 63 can be provided as a number of equidistantly distributed around the axis of the swivel gear ring 62. Furthermore, a driving motor 71 is installed on the base 10, and the output shaft of the driving motor 71 is distributed along the vertical direction, and a driving gear 72 meshing with the rotating gear ring 62 is coaxially fixed on the output shaft of the driving motor 71. The driving motor 71 drives the driving gear 72 to mesh with the rotating gear ring 62 from the side, which does not occupy the inner space of the rotating gear ring 62, and thus does not hinder the distribution of the wires on the inner side of the rotating gear ring 62. Of course, there are other implementations for driving the rotating gear ring 62, such as the rotating gear ring 62 is a worm gear, and the rotating gear ring 62 is driven to rotate by the motor driving the worm to mesh with the rotating gear ring 62; or a rack that slides horizontally and linearly is used to mesh with the rotating gear ring 62, and the rotating gear ring 62 is driven to rotate by the horizontal sliding of the rack.

[0038] It is worth mentioning that Figure 3 As shown, the pressure plate 40 is composed of a fixed plate 41 and a movable plate 42 that can be detachably assembled, and the fixed plate 41 is connected to the travel end of the linear elastic mechanism, and the inner plate surface of the movable plate 42 constitutes a clamping portion. When testing cells of different diameters or heights, the movable plate 42 can be replaced so that the inner plate surface of the replaced movable plate 42 is adapted to the outer contour of the cell, which can be suitable for testing cells of different diameters or heights. The fixed plate 41 and the movable plate 42 are disassembled in the following manner: a positioning hole 411 distributed along the vertical direction is provided on the top of the fixed plate 41, and a positioning plug 421 that is plugged and matched with the positioning hole 411 is provided on the movable plate 42. When assembled and installed, the positioning plug 421 is plugged into the positioning hole 411 at the top of the fixed plate 41 from top to bottom through the movable plate 42. When disassembling, the movable plate 42 only needs to slide upward, which ensures the convenience of disassembly and assembly of the fixed plate 41 and the movable plate 42.

[0039] Of course, for those skilled in the art, the present invention is not limited to the details of the exemplary embodiments described above, but also includes the same or similar structures that can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, so it is intended to include all changes that fall within the meaning and scope of the equivalent elements of the claims. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0040] In addition, it should be understood that although this specification is described in accordance with the implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation modes that can be understood by those skilled in the art. The technology, shape, and structure parts not described in detail in this utility model are all well-known technologies.

Claims

1. A cylindrical battery cell expansion force test tool, characterized in that: The invention comprises a base (10), the top of which is mounted a battery cell fixing seat on which a work station platform can rotate around a vertical axis, a pressing plate (40) is arranged directly above the work station platform, the pressing plate (40) is driven by a linear elastic mechanism and generates a radial horizontal displacement movement toward the work station platform, and a pressure sensor (32) is arranged between the pressing plate (40) and the travel end of the linear elastic mechanism, and a clamping portion is formed by one side of the pressing plate (40) close to the vertical axis of the work station platform, and the shape of the clamping portion matches the outer contour of the battery cell.

2. The expansion force testing tool for cylindrical battery cells according to claim 1, characterized in that: The pressing plates (40) are a plurality of pressing plates evenly spaced around the vertical axis of the workstation platform, and a power component for driving all the pressing plates (40) to expand outward is also provided on the base (10).

3. The expansion force testing tool for cylindrical battery cells according to claim 2, characterized in that: The power assembly comprises an airbag ring (52) coaxially arranged with the vertical axis of the workstation platform. The airbag ring (52) is inflated and exhausted by an air pump (51). The bottom of each pressing plate (40) is fixedly connected with a connecting buckle (53) fixed to the outer periphery of the airbag ring (52).

4. The expansion force testing tool for cylindrical battery cells according to claim 1, characterized in that: The linear elastic mechanism comprises a telescopic rod (30) whose length direction extends horizontally toward the vertical axis of the workstation platform, and a compression spring (31) is sleeved on the telescopic rod (30) for pushing the pressure plate (40) to elastically move. A fixed ring frame (20) coaxially distributed with the vertical axis of the workstation platform is fixed on the base (10), and the pressure plate (40) is distributed in the inner cavity of the fixed ring frame (20), and the fixed end of the telescopic rod (30) is fixedly connected to the fixed ring frame (20).

5. The expansion force testing tool for cylindrical battery cells according to claim 1, 2, 3 or 4, characterized in that: The battery cell fixing seat comprises a swivel support ring (61) fixed on the top of the base (10) in a bracket-like manner, the axis of the swivel support ring (61) is distributed along the vertical direction, and a swivel gear ring (62) is coaxially rotated on the top of the swivel support ring (61), and the top surface of the swivel gear ring (62) constitutes the workstation platform.

6. The expansion force testing tool for cylindrical battery cells according to claim 5, characterized in that: A driving motor (71) is mounted on the base (10), the output shaft of the driving motor (71) is vertically distributed, and a driving gear (72) meshing with the rotating gear ring (62) is coaxially fixed on the output shaft of the driving motor (71).

7. The expansion force testing tool for cylindrical battery cells according to claim 5, characterized in that: A suction cup (63) for adsorbing and fixing the battery core is installed on the top surface of the rotating gear ring (62).

8. The expansion force testing tool for cylindrical battery cells according to claim 1, 2, 3 or 4, characterized in that: The pressing plate (40) is composed of a fixed plate (41) and a movable plate (42) which can be detachably assembled, and the fixed plate (41) is connected to the travel end of the linear elastic mechanism, and the inner plate surface of the movable plate (42) constitutes a clamping portion.

9. The expansion force testing tool for cylindrical battery cells according to claim 8, characterized in that: The top of the fixed plate (41) is provided with positioning holes (411) distributed in the vertical direction, and the movable plate (42) is provided with positioning rods (421) plugged into and matched with the positioning holes (411).

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