CN216731506U - Fixing device for detecting battery pole piece and detection system - Google Patents

Abstract

The utility model relates to a fixing device for detecting a battery pole piece, which comprises a base, a platform arranged on the base and used for placing the battery pole piece, and a holding mechanism used for fixedly holding the battery pole piece on the platform, wherein the fixing device comprises a horizontal adjusting mechanism, and the size of a laying area of the platform can be adjusted through the horizontal adjusting mechanism. The utility model also relates to a detection system for the battery pole piece, which comprises a detection instrument for detecting the surface state of the battery pole piece and the fixing device. By utilizing the fixing device provided by the utility model, the detection requirements on burrs on different surfaces of the pole piece can be met, and the pole piece fixing device can be suitable for pole pieces with different sizes and specifications.

Description

Fixing device for detecting battery pole piece and detection system

Technical Field

The utility model relates to the technical field of batteries, in particular to a fixing device for battery pole piece detection and a detection system comprising the fixing device.

Background

With the rise and rapid development of new energy automobile markets, a lithium ion power battery monomer, a battery pack or a system is widely applied as one of key parts of an electric automobile. Since the capacity of lithium batteries is increasing very rapidly, the demand for quality inspection is also increasing at the same time.

In the production of lithium batteries, it is often necessary to cut battery pole pieces to a specified size for the next assembly of winding or stacking. In the pole piece cutting process, burrs are easily formed at the cutting edge of the pole piece due to various reasons such as the fact that the blade is not sharp enough. However, these burrs pose a great safety hazard to the lithium battery, for example, metal burrs on the battery pole piece may pierce through the separator to cause internal short circuit of the battery, or lithium dendrites may be generated in a large amount during charging and discharging to cause short circuit or self-discharge. The internal short circuit phenomenon of the battery can cause thermal runaway (commonly called fire) of the lithium battery, thereby bringing great potential safety hazard to automobile users. Under the background, the burr detection of the battery pole piece becomes an important detection item in the production of the lithium battery. At present, most of lithium battery factories use common image measuring instruments, such as a two-dimensional measuring instrument, an optical microscope, an industrial camera and the like.

In the process of detecting the battery pole piece, the pole piece needs to be completely unfolded and always kept stable. The current mainstream battery pole piece is very thin, about 100 and 500 microns, and thin pole piece needs a special anchor clamps to keep its stability in order to avoid this pole piece to receive the pollution like this, and need pay attention to avoid touching the pole piece edge in the clamping process to lead to the inaccuracy of test result. In addition, because the plane burr on the plane of the pole piece needs to be detected, and the cross-section burr on the cutting edge of the pole piece needs to be detected, a clamp is needed to keep the pole piece upright when the cross-section burr of the pole piece is detected.

Various methods and devices for securing or clamping pole pieces are known in the art. For example, it is known to clamp a pole piece by using a simple magnet clamp, but each time the pole piece is clamped by using the clamp, the position and state of the pole piece are greatly affected by an operator, so that the pole piece cannot be repeatedly clamped, and the efficiency is low because the magnet is repeatedly clamped due to the need to detect a plurality of surfaces of the battery pole piece. In addition, manual operation can also lead to the pole piece not to expand completely or have bending deformation for the pole piece of centre gripping probably produces the fold and causes the erroneous judgement or the wrong judgement of burr, and when using microscope to detect the burr, if the pole piece is uneven, need adjust the focus of microscope constantly, further reduced detection efficiency and accuracy.

In addition, clamping devices are known which simply press the pole pieces against a similarly dimensioned base using a weight. However, since this device cannot be adapted to a microscope table, it is necessary to manually move an extremely heavy base to adjust the observation position when measuring different cutting edges, resulting in inconvenience in operation. In addition, because the pole piece is put comparatively at will usually, be difficult to aim at the viewing direction, and if the top heavy object sheltered from test equipment's camera lens, still need put away this heavy object and lead to the observation position to change, these all lead to lower detection efficiency. The device is also not easy to detect burrs on the cross section of the pole piece, and meanwhile, a corresponding proper base needs to be selected or designed for pole pieces with different sizes and specifications.

Accordingly, there is a need for a novel fixture for battery pole piece testing that overcomes one or more of the problems set forth above and/or other deficiencies in the prior art.

SUMMERY OF THE UTILITY MODEL

The utility model is provided based on the background, and aims to provide a fixing device for battery pole piece detection, which can be particularly used with a detection instrument (such as an image measuring instrument), and the fixing device can meet the detection requirements of burrs on different surfaces of a pole piece, can adapt to pole pieces with different sizes and specifications, and greatly improves the detection efficiency and accuracy.

According to a first aspect of the present invention, a fixing device for battery pole piece detection is provided, the fixing device comprises a base, a platform arranged on the base for placing a battery pole piece, and a holding mechanism for fixedly holding the battery pole piece on the platform, wherein the fixing device comprises a horizontal adjusting mechanism, and the size of a resting area of the platform can be adjusted through the horizontal adjusting mechanism.

According to a second aspect of the present invention, it proposes a detection system for a battery pole piece, said detection system comprising a detection instrument for detecting the surface condition of the battery pole piece and the above-mentioned fixing means, which is adapted to be mounted on the worktable of said detection instrument.

It should be understood that, by using the fixing device of the utility model in cooperation with a detection instrument, the whole detection process of the battery pole piece is simple to operate, the interference of a tester to the detection process is avoided to the greatest extent, and the complicated debugging work is reduced, so that the detection efficiency and the accuracy are greatly improved.

Drawings

The above and other features and advantages of the present invention will become more readily understood from the following description with reference to the accompanying drawings, in which:

FIG. 1 illustrates a perspective view of a fixture for battery pole piece inspection in accordance with one embodiment of the present invention;

FIG. 2 is a schematic view of the fixing device for battery pole piece detection in FIG. 1 in cooperation with an image measuring instrument, wherein the pressing plate is in an open position relative to the platform, and the battery pole piece is horizontally placed on the resting surface of the platform;

FIG. 3 is a schematic view of the fixture for battery pole piece inspection of FIG. 1 in use with an image measuring instrument, wherein the platen is in a closed position relative to the platform, and the battery pole piece is clamped between the platen and the platform in another angular orientation than that of FIG. 2;

FIG. 4 illustrates a schematic view of a particular embodiment of a level adjustment mechanism included in the fixture shown in FIG. 1;

FIG. 5 shows a schematic view of a particular embodiment of a pre-compaction mechanism included in the fixture shown in FIG. 1;

FIG. 6 schematically illustrates a schematic view of a magnetic locking mechanism for effecting locking and unlocking of the platen to the platform;

FIG. 7 shows a schematic view of the platen in a locked state relative to the platform;

FIG. 8 is a schematic diagram illustrating an exemplary embodiment of a rotation limiting mechanism for defining different opening positions of a platen relative to a platen;

FIG. 9 illustrates a schematic diagram of a particular embodiment of an angular adjustment mechanism included in the fixture for battery pole piece testing shown in FIG. 1;

FIG. 10 shows a schematic view of a particular embodiment of a rotation limiting mechanism for defining different angles of rotation of the platform relative to the base in cooperation with the angular adjustment mechanism of FIG. 9; and

FIG. 11 illustrates an alternative embodiment of a guide mechanism included in a fixture for battery pole piece detection according to the present invention.

Detailed Description

The present invention will be described in further detail with reference to the following drawings and specific examples. Terms such as "first," "second," and the like are used hereinafter to describe elements of the present application and are used only to distinguish one element from another without limiting the nature, sequence, order, or number of such elements. In addition, it is to be noted that in the present description, identical and/or functionally identical technical features are provided with the same or similar reference signs.

The fixing device 1 for battery pole piece detection according to the utility model comprises a base 2 (which can be adapted to a workbench of a corresponding detection instrument 30), a platform 4 arranged on the base 2 for placing a battery pole piece 3, and a holding mechanism for fixedly holding the battery pole piece 3 on the platform 4. In order to be able to detect burrs on different faces of the pole piece, in particular on the cut faces, the fixing device 1 of the utility model is provided with an angular adjustment mechanism 5, which angular adjustment mechanism 5 is able to adjust the angle of the platform 4 with respect to the base 2, thus allowing the detection of the battery pole piece 3 in a plurality of different angular detection positions. In addition, in order to allow measurements to be made on pole pieces of different dimensions (for example different widths), the fixture 1 comprises a horizontal adjustment mechanism 6 to enable adjustment of the resting area of the platform 4, so as to allow the platform 4 to be adapted to receive pole pieces within a range of width dimensions. According to the fixing device of the utility model, for example, the detection of pole pieces with the width size ranging from 50mm to 100mm can be realized.

In particular, with reference to fig. 1, which shows a particular embodiment of a fixing device 1 for battery pole piece detection according to the utility model, the platform 4 is constituted by a pair of retaining rods. With particular reference to fig. 4, a slider 7 is fixedly connected to the first holding bar 4a, and a rail 8 is fixedly connected to the second holding bar 4b, said slider 7 and rail 8 together constituting the above-mentioned level adjustment mechanism 6. The slide 7 and the rail 8 may for example take the form of a slot-and-tongue joint. It can be seen that the track 8 as shown in figure 4 takes the form of a guide rail of triangular cross-section, and correspondingly a triangular projection adapted to slide in the guide rail of triangular cross-section is provided on the slider 7. Of course other configurations or cross-sectional forms of the guide rail are possible as long as the above-described linear movement is achieved.

By sliding the slider 7 in the track 8, it is possible to vary the relative distance between said first 4a and second 4b retaining bars, i.e. to vary the width of the horizontal resting zone formed by the two retaining bars. A first platen member 9a and a second platen member 9b are rotatably connected to the first holding rod and the second holding rod, respectively. In this way, the second holding rod 4b is fixed on the base 2 together with the rail 8 fixedly connected thereto and the second pressure plate 9b, while the first holding rod 4a carries the first pressure plate 9a with the slider 7 together with the second holding rod 4b and the second pressure plate 9 b. Of course, the opposite arrangement is also possible, i.e. the first holding rod is arranged to be fixed and the second holding rod is arranged to be slidable.

In order to provide guidance to allow a stable and smooth movement when said first holding rod 4a is moved relative to the second holding rod 4b, the fixation device 1 is further provided with a guiding mechanism comprising a structure capable of guiding said first holding rod in a linear movement relative to the second holding rod and a structure capable of guiding said first pressure plate member in a linear movement relative to the second pressure plate member.

For example, in an exemplary embodiment according to the present invention shown in fig. 1, a first guide groove rail 10a is fixedly connected to the second holding rod 4b, and a first guide protrusion 12a (see fig. 7) which is engaged with the first guide groove rail 10a is provided on a distal end of the first holding rod 4a, such that the first holding rod 4a can slide relative to the second holding rod 4b along the first guide groove rail 10a using the first guide protrusion 12 a; correspondingly, a second guide groove rail 10b is fixedly connected to the second platen element 9b, and a second guide projection 12b, which cooperates with the second guide groove rail 10b, is provided at the end of the first platen element 9a, so that the first platen element 9a can slide along the second guide groove rail 10b relative to the second platen element 9b by means of the second guide projection 12 b. Furthermore, by attaching the first and second presser members together with the second guide groove rail 10b, a synchronized rotation of the first and second presser members relative to the respective retainer bars can be achieved. In the embodiment shown in fig. 7, the first and second guide rails are implemented as rails of triangular cross-sectional form, and the first and second guide projections are implemented as triangular projections adapted to slide in the rails of triangular cross-sectional form.

In addition, according to another alternative embodiment as shown in fig. 11, a first guide groove rail 10a ' is fixedly connected to the second holding rod 4b, and a first guide screw 13 capable of sliding in the first guide groove rail 10a ' is provided on an end portion of the first holding rod 4a, so that the first holding rod 4a can slide along the first guide groove rail 10a ' relative to the second holding rod 4b by means of the first guide screw 13; correspondingly, a second slotted guide track 10b ' is fixedly connected to the second pressure plate element 9b, and a second guide screw (not shown) which cooperates with the second slotted guide track 10b ' is arranged at the end of the first pressure plate element 9a, so that the first pressure plate element 9a can slide along the second slotted guide track 10b ' relative to the second pressure plate element 9b by means of the second guide screw. In the embodiment shown in fig. 11, the guide channel rail takes the form of a straight T-shaped channel and the guide screw takes the form of a plastic screw. By adopting the structure that the guide groove rails are matched with the screws to slide, the opening and closing movements of the first and second pressure plate parts 9a and 9b can be better coupled, and any swing of the moving parts (including the first pressure plate part 9a and the first holding rod 4a) in the linear movement process is avoided.

It should be understood that, in addition to the above-described embodiments, guide mechanisms having other structural forms capable of achieving the above-described linear motion guide are possible.

The battery pole piece 3 can be stably held on the stage 4 by the pressing plate 9 after being placed on the stage 4 constituted by the holding rod. Referring to fig. 2-3, the pressure plate 9 is rotatable relative to the platform 4 (in particular the first and second retaining bars) between an open position, in which the pressure plate 9 is remote from the platform 4 to allow the battery pole piece 3 to be received on the platform 4, and a closed position; in the closed position, the pressure plate 9 is pressed against the platform 4 to allow clamping of the battery pole piece 3 between the platform 4 and the pressure plate 9. In particular, the main plane of the battery pole piece 3 (i.e. the large surface of the battery pole piece) can abut against the resting surface of the platform and the surface of the pressing plate opposite to the resting surface (see fig. 2) along the whole length direction, so that the battery pole piece is completely unfolded in the clamping state without any bent part, thereby avoiding the false judgment or the missing judgment of burrs caused by the generation of wrinkles due to bending.

More advantageously, the horizontal adjustment mechanism 6 can be conveniently adjusted to a suitable position according to the graduated indications provided on the track 8, so that the side edge of the battery pole piece to be detected can be completely exposed from the edges of the pressure plate and of the platform when the pressure plate 9 is placed in the closed position. Therefore, related operations such as re-clamping or debugging which are required to be carried out for detecting the unexposed or shielded part edge in the prior art can be avoided.

To facilitate the operation of the pressure plates 9 to move between the open and closed positions, an operating handle 11 is also provided on one of the pressure plate members, see in particular fig. 7.

When the pressure plate 9 is placed in the closed position to retain the battery pole piece 3 between the pressure plate 9 and the retaining bars 4a,4b, the pressure plate may be locked in the closed position relative to the platform using a locking mechanism. The locking mechanism may take the form of a magnetic locking mechanism. For example, referring to fig. 6, a magnetic structure 31 may be provided on one end of each holding rod, and a corresponding magnetic structure may be provided at a region of the pressure plate corresponding to the end of the holding rod, so that both are held locked by magnetic force. In addition, closure locking can also be assisted by a rotation limiting mechanism 25 '(described below) as shown in FIG. 8, which can be assisted by a biasing member 28', such as a leaf spring, to hold the pressure plate in a closed position (i.e., the initial 0 position) relative to the platform.

Accordingly, when the resting area of the platform is adjusted to an appropriate size using the level adjustment mechanism, the platform may be locked using another locking mechanism to keep the resting area unchanged. With particular reference to fig. 4, a knob 14 with a threaded rod can be screwed into a corresponding threaded hole in the slider 7. This can be achieved by turning the knob 14 towards the side of the track 8 so that the threaded rod on the knob 14 abuts the underside of the track, but when it is desired to change the relative distance between the two retaining rods, the knob need only be slightly unscrewed.

It will be appreciated that other locking mechanisms known in the art are possible, as long as the position locking function intended above is achieved.

According to an advantageous embodiment, see in particular fig. 5, a pre-stressing mechanism in the form of, for example, a spring plate 15 is provided between each holding rod and the respective pressure plate, which spring plate 15 can pre-stress the battery pole piece 3 with a pre-stressing force against the platform 4. The pre-positioning of the pole pieces by the pre-compression mechanism before clamping the battery pole pieces 3 with the pressure plate 9 enables the battery pole pieces to be held more reliably to avoid any undesired play or misalignment during handling of the pole pieces.

The above-mentioned angular adjustment mechanism 5 for adjusting the relative angle between the platform 4 and the base 2 will be described in detail next with reference to fig. 9.

The angular adjustment mechanism 5 comprises a bevel gear pair and a worm-and-gear pair which are in a meshing relationship; in which a rotary wheel 16 (a hand wheel as shown in figure 9) is mounted coaxially with a first bevel gear 17 in the bevel gear pair on a first rotary shaft 18 so as to rotate synchronously about the same rotary shaft. The second bevel gear 19 of the bevel gear pair is mounted on a second axis of rotation 21 coaxially with the worm 20 of the worm-and-gear pair so as to rotate synchronously about the same axis of rotation. The worm wheel 22 of the worm-and-gear pair is mounted on a third rotational shaft 23, wherein the platform 4 is fixedly connected to the third rotational shaft 23, for example via a mounting bracket 24 (see fig. 1), for synchronous rotation therewith.

When the tester slightly rotates the rotating wheel, the tester drives the first bevel gear 17 on the first rotating shaft 18 to rotate together and further drives the second bevel gear 19 meshed with the first bevel gear 17 and the worm 20 rotating coaxially with the second bevel gear 19, and finally transmits the rotating motion to the third rotating shaft 23 by using worm and gear transmission. By means of the rotary movement of this third axis of rotation 23, the platform 4 will be driven to different angular positions with respect to the base 2 to allow detection of burrs on different faces of the pole piece.

It should be appreciated that the present invention employs a worm gear drive which not only achieves a large transmission ratio to enable rotation of the platform with a slight torque acting on the rotating wheel, but also utilizes the self-locking property of the worm gear drive to prevent the entire drive from being forced to move in an undesired opposite direction due to the tester inadvertently touching the platform, thereby avoiding the change in the position of the pole piece due to a malfunction.

As mentioned previously, it is often necessary to inspect multiple faces of the pole piece, which requires that the pole piece be held stably in a number of different angular inspection positions. In order to define each angular detection position precisely in order to eliminate the tedious commissioning work of the tester in determining the respective detection position, a rotation limiting mechanism 25 is preferably provided, which rotation limiting mechanism 25 is able to cooperate with the angular adjustment mechanism 5 to define a plurality of different angles through which the platform 4 rotates relative to the base 2, each angle corresponding to a respective different angular detection position of the battery pole piece 3.

In particular, and with particular reference to fig. 10, the rotation-limiting mechanism 25 comprises a rotation-limiting disc 26, which may be mounted, for example, on the third rotation shaft 23 (as in the embodiment shown in fig. 9). Of course, the rotation limiting disc may be mounted on any rotating shaft included in the angular adjustment mechanism, and only the function of rotation limiting described herein can be achieved, that is, the rotation limiting disc 26 can accurately limit each angular position in the process of rotating along the rotating shaft. The rotation-restricting disk 26 is provided on its outer periphery with a plurality of notches distributed at predetermined angular intervals in the circumferential direction. For example, referring to fig. 10, the rotation-limiting disk 26 is provided on its outer periphery with four equally spaced notches 27 which can act as indexing means to index the circumferential rotation of the rotation-limiting disk into four angular positions spaced 90 degrees from each other. The rotation limiting mechanism 25 further comprises a biasing mechanism 28 and a rolling member 29, wherein the biasing mechanism 28 presses the rolling member 29 against the rotation limiting disc 26; wherein the rolling elements 29 run on the outer circumference of the rotation-limiting disc 26 when the rotation-limiting disc 26 is turned, for example, following a third axis of rotation, the rolling elements 29 falling successively from one recess defining one angular detection position into the other recess defining the other angular detection position.

For example, when the battery pole piece 3 is in a horizontal state as shown in fig. 2, the rolling member 29 may be located at one of the notches 27 of the rotation-restricting disk 26. As the rotation-limiting disc 26 follows the first or third axis of rotation, the rolling elements 29 fall out of the recesses and into the other recesses, thus producing a clicking-type movement. Each time the roller 29 passes a notch (while sensing a "click") it indicates that the platform has rotated through 90 degrees. This is of great importance for the detection of the pole pieces, since the rolling elements fall into different recesses, representing different detection positions of the pole pieces, which allows each angular detection position of the battery pole piece to be accurately defined.

Advantageously, a rotation-limiting mechanism 25' of similar construction may be provided between the pressure plate and the retaining bar described above, so that it is possible to facilitate accurate positioning of the pressure plate in three different angular positions relative to the retaining bar. With particular reference to fig. 8, three recesses 27 'are provided in the rotation-limiting disk 26', which correspond to three different angular positions, so that the pressure plate can assume three different degrees of opening relative to the retaining rod. When the rolling member 29 'is at the lowermost recess (corresponding to the 0 position), the biasing member 28' can be used to assist in maintaining the platen in the closed position relative to the platform.

By integrating the fixing device 1 according to the present invention on the detecting instrument 30 for detecting the surface state of the battery pole piece, efficient and accurate detection of the battery pole piece can be achieved, and uncertainty due to manual operation and erroneous or missing judgment of burrs due to any erroneous operation are largely avoided. The mounting process and the detection process of the pole piece only involve a plurality of simple steps:

-mounting the fixture to a detection instrument, such as an image measuring instrument;

-loosening the knob according to the width of the pole piece to be detected, quickly selecting the appropriate position according to a scale indication on the guide rail, for example 50-100. Pushing the knob to drive the first retaining rod and the sliding piece to translate in the track so as to adjust the relative distance between the retaining rods, and screwing the knob after the position is selected to complete locking;

-opening the presser plate, placing the pole piece on the holding rod and pre-pressing the pole piece against the holding rod by means of a pre-pressing mechanism;

-closing the platen and inspecting the first side of the pole piece with an inspection instrument; after the detection is finished, the rotating wheel is shifted, the platform is rotated by 90 degrees, and the detection instrument is utilized to realize the detection of the second surface of the pole piece. Therefore, the platform can be continuously rotated until burr detection of all surfaces to be detected of the pole piece is completed.

The fixing device is matched with a detection instrument for use, so that the detection requirement on burrs on different surfaces of the pole piece can be met, and the pole piece detection device can be suitable for pole pieces with different sizes and specifications. Moreover, the whole process is very simple (for example, the clamping process only involves one opening and closing operation between the pressure plate and the holding rod), and the detection of 4 different positions can be completed. This greatly alleviates the tedious debugging work of the tester, so that the detection efficiency and accuracy are greatly improved.

It should be noted that the above-described embodiments should be regarded as merely illustrative, and the present invention is not limited to these embodiments. Various changes and modifications may be made by those skilled in the art without departing from the scope or spirit of the utility model in view of the contents of this specification. With a true scope of the utility model being indicated by the following claims and their equivalents.

Claims (17)

1. A fixing device (1) for battery pole piece detection, the fixing device (1) comprises a base (2), a platform (4) arranged on the base (2) and used for placing a battery pole piece (3), and a holding mechanism used for fixedly holding the battery pole piece (3) on the platform (4), and the fixing device (1) is characterized by comprising a horizontal adjusting mechanism (6), and the size of a placement area of the platform (4) can be adjusted through the horizontal adjusting mechanism (6).

2. A fixture (1) according to claim 1, wherein the retaining mechanism comprises a pressure plate (9) rotatable relative to the platform (4) between an open position, in which the pressure plate (9) is remote from the platform (4) to allow receipt of the battery pole piece (3) thereon, and a closed position, in which the pressure plate (9) is pressed against the platform (4) to allow clamping of the battery pole piece (3) therebetween.

3. The fixture (1) according to claim 2, characterized in that, in the closed position, the main plane of the battery pole piece (3) can abut along the entire length against the resting face of the platform (4) and against the surface of the pressure plate (9) opposite to this resting face.

4. A fixture (1) according to claim 3, characterized in that the level adjustment mechanism (6) can be adjusted such that, when the pressure plate (9) is placed in the closed position, the side edge of the battery pole piece (3) to be detected can be completely exposed from the edges of the pressure plate (9) and the platform (4).

5. Fixing device (1) according to one of claims 1 to 4, characterized in that the holding mechanism is also provided with a pre-pressing mechanism, so that the battery pole pieces can be pre-pressed against the platform with a pre-tightening force.

6. The fixing device (1) according to any one of claims 2 to 4, characterized in that the platform (4) is constituted by a pair of retaining bars, the leveling mechanism (6) comprising a slider (7) fixedly connected to a first retaining bar (4a) and a track (8) fixedly connected to a second retaining bar (4b), wherein the slider (7) is slidable along the track (8) so as to vary the relative distance between the first retaining bar (4a) and the second retaining bar (4 b).

7. A fixation device (1) according to claim 6, wherein the pressure plate (9) comprises a first pressure plate member (9a) and a second pressure plate member (9b) rotatably connected with the first retaining rod (4a) and the second retaining rod (4b), respectively.

8. A fixation device (1) according to claim 7, characterised in that it is further provided with guide means capable of guiding a first guide structure for the linear movement of the first holding rod (4a) relative to the second holding rod (4b) and a second guide structure for the linear movement of the first platen member (9a) relative to the second platen member (9 b).

9. A fixture (1) according to any one of claims 1 to 4, characterized in that it further comprises an angular adjustment mechanism (5) capable of adjusting the angle of the platform with respect to the base, so as to allow the detection of a battery pole piece in a plurality of different angular detection positions.

10. A fixture (1) according to claim 9, characterized in that it is further provided with a rotation limiting mechanism (25) able to cooperate with said angular adjustment mechanism (5) to define a plurality of different angles through which said platform (4) rotates with respect to the base (2), each angle corresponding respectively to a different angular detection position of said battery pole piece.

11. Fixing device (1) according to claim 10, characterized in that the angular adjustment mechanism (5) comprises a bevel gear pair comprising a first bevel gear (17) and a second bevel gear (19) in mesh with each other, and a worm-and-gear pair comprising a worm wheel (22) and a worm (20) in mesh with each other.

12. The fastening device (1) according to claim 11, wherein a rotating wheel (16) is mounted on a first rotation axis (18) coaxially with the first bevel gear (17), the second bevel gear (19) is mounted on a second rotation axis (21) coaxially with the worm (20), the worm wheel (22) is mounted on a third rotation axis (23); wherein the platform is fixedly connected to the third rotation axis so as to be driven in rotation by means of a rotational movement of the third rotation axis.

13. The fixture (1) according to claim 12, wherein the rotation-limiting mechanism (25) comprises a rotation-limiting disc (26) that can be mounted on any rotation axis comprised in the angular adjustment mechanism; the rotation-restricting disk is provided on its outer periphery with a plurality of notches (27) distributed at intervals of a predetermined angle in the circumferential direction.

14. The fixture (1) according to claim 13, wherein the rotation limiting mechanism (25) further comprises a biasing mechanism (28) and a roller (29), the biasing mechanism (28) pressing the roller (29) against the rotation limiting disc (26); when the rotation limiting disc rotates along with the rotation shaft, the rolling piece falls into other notches which define other angular detection positions from one notch which defines one angular detection position.

15. Fixing device (1) according to any of claims 1 to 4, characterized in that it is also provided with a first locking mechanism capable of locking the platform to keep the rest area unchanged when it is adjusted to the right size with the level adjustment mechanism.

16. A fixture (1) according to any one of claims 2 to 4, further comprising a second locking mechanism capable of locking the platen in a closed position relative to the platform and a stop mechanism capable of holding the platen in a plurality of different open positions relative to the platform.

17. A detection system for battery pole pieces, characterized in that it comprises a detection instrument (30) for detecting the surface condition of a battery pole piece and a fixing device (1) according to any one of the preceding claims, which is adapted to be mounted on a worktable of said detection instrument (30).

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