CN221465308U - Lithium battery pole piece flexibility testing device - Google Patents

Abstract

The utility model discloses a lithium battery pole piece flexibility testing device which comprises a recovery roller, an optical sorting system, a first tension roller, a second tension roller, a third tension roller, a fourth tension roller, a first guide roller, a second guide roller and a winding roller, wherein the first guide roller is arranged on the first side of the recovery roller; the winding roller is positioned on the right side of the recovery roller; the right end of the pole piece is wound on the circumferential outer wall of the winding roller; the left end of the pole piece is wound on the circumferential outer wall of the recovery roller; the part of the pole piece between the winding roller and the recovery roller sequentially winds through the outer walls of the first tension roller, the second tension roller, the third tension roller and the fourth tension roller from left to right; the pole piece is positioned between the recovery roller and the first tension roller and transversely passes through pole piece through holes respectively reserved on the left side wall and the right side wall of the main shell of the optical sorting system; the optical sorting system is used for collecting optical images on the surfaces of the upper side and the lower side of the pole piece. The utility model has scientific design, can reliably test the flexibility of the lithium battery pole piece and ensures the production quality of the pole piece.

Description

Lithium battery pole piece flexibility testing device

Technical Field

The utility model relates to the technical field of lithium ion batteries, in particular to a lithium battery pole piece flexibility testing device.

Background

The lithium ion battery has the advantages of high specific energy, multiple recycling times, long storage time and the like, is widely applied to portable electronic equipment (such as mobile phones, digital cameras and portable computers) and is widely applied to large and medium-sized electric equipment such as electric automobiles, electric bicycles, electric tools and the like, so that the performance requirement on the lithium ion battery is higher and higher.

For lithium ion batteries, the production of battery pole pieces requires the procedures of powder slurry, coating, rolling, shearing and the like, wherein the coating, rolling and winding of the battery pole pieces are key procedures for pole piece production. The flexibility of the pole piece can influence the electrochemical performance and the safety performance of the battery, and if the flexibility of the pole piece is poor, the problem that the active substances coated on the pole piece drop off when the pole piece is wound can be caused, and even the crease deformation of the core part of the battery obtained by winding is caused.

However, at present, no technology is available, which can reliably test the flexibility of the pole piece of the lithium battery and ensure the final production quality of the pole piece.

Disclosure of utility model

The utility model aims at solving the technical defects existing in the prior art and provides a lithium battery pole piece flexibility testing device.

Therefore, the utility model provides a lithium battery pole piece flexibility testing device, which comprises: a recovery roller, an optical sorting system, a first tension roller, a second tension roller, a third tension roller, a fourth tension roller, a first guide roller, a second guide roller, and a winding roller;

a winding roller positioned on the right of the recovery roller;

the right end of a pole piece is wound on the circumferential outer wall of the winding roller;

the left end of the pole piece is wound on the circumferential outer wall of the recovery roller;

The pole piece is positioned between the winding roller and the recovery roller and sequentially wound through the outer walls of the first tension roller, the second tension roller, the third tension roller and the fourth tension roller from left to right;

The pole piece is positioned between the recovery roller and the first tension roller, transversely passes through pole piece through holes respectively reserved on the left side wall and the right side wall of the main shell of the optical sorting system;

And the optical sorting system is used for collecting optical images of the upper and lower side surfaces of the pole piece, and taking the obtained pole piece photo as a photo special for the flexibility test of the pole piece.

Compared with the prior art, the utility model provides the lithium battery pole piece flexibility testing device which is scientific in design, can reliably test the flexibility of the lithium battery pole piece, ensures the final production quality of the pole piece, and has great practical significance.

By applying the testing device disclosed by the utility model, the flexibility of the pole piece can be subjected to standardized and dataized testing after the pole piece is rolled.

According to the utility model, the flexibility test photo of the lithium battery pole piece is finally obtained by optically sorting the pole piece (the pole piece with folds) obtained by coating and rolling, winding (winding, namely, the pole piece is conveyed from the direction of the recovery roller to the direction of the winding roller) and rewinding (rewinding, namely, the pole piece is conveyed from the winding roller to the direction of the recovery roller), and the flexibility test result of the pole piece is obtained through staff analysis, so that the follow-up battery production process is facilitated.

Drawings

Fig. 1 is a schematic diagram of an operating state of the device for testing flexibility of a lithium battery pole piece provided by the utility model when a winding (winding, that is, a moving and conveying of a pole piece from a recovery roller to a winding roller) operation is performed;

Fig. 2 is a schematic structural diagram of the device for testing flexibility of a lithium battery pole piece, provided by the utility model, when a rewinding (rewinding, i.e. moving and conveying the pole piece from a winding roller to a recovery roller) operation is performed.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

In the description of this patent, it should be noted that, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "disposed" are to be construed broadly, and may be fixedly connected, disposed, detachably connected, disposed, or integrally connected, disposed, for example. The specific meaning of the terms in this patent will be understood by those of ordinary skill in the art as the case may be.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

Referring to fig. 1 and 2, the utility model provides a lithium battery pole piece flexibility testing device, which comprises: a recovery roller 1, an optical sorting system 2, a first tension roller 31, a second tension roller 32, a third tension roller 33, a fourth tension roller 34, a first guide roller 41, a second guide roller 42, and a winding roller 5;

A winding roller 5 positioned on the right of the recovery roller 1;

The winding roller 5 is wound with the right end of a piece of pole piece 6 (a pole piece roll is formed on the winding roller 5) on the circumferential outer wall, so that the pole piece can be rewound by winding;

the left end of the strip of pole pieces 6 is wound on the circumferential outer wall of the recovery roller 1 (pole piece coils are formed on the recovery roller 1);

the portion of the pole piece 6 between the winding roller 5 and the recovery roller 1 is wound through the outer walls of the first tension roller 31, the second tension roller 32, the third tension roller 33 and the fourth tension roller 34 in sequence from left to right;

wherein, the pole piece 6 is positioned between the recovery roller 1 and the first tension roller 31 and transversely passes through pole piece through holes respectively reserved on the left side wall and the right side wall of the main shell 100 of the optical sorting system 2;

The optical sorting system 2 is used for collecting (i.e. photographing) optical images of the upper and lower side surfaces of the pole piece 6 (specifically, slurry coatings with preset lengths on the upper and lower side surfaces of the pole piece 6), and taking the obtained pole piece photo as a photo special for flexibility test of the pole piece 6;

The special photo for the flexibility test is used for analyzing by a worker to obtain the final flexibility test result of the pole piece.

In the present utility model, in particular, as shown in fig. 1, when the pole piece 6 previously coated and rolled is wound (winding, that is, the pole piece is transferred from the recovery roller to the winding roller), the recovery roller 1 is rotated clockwise, the winding roller 5 is rotated counterclockwise, the second tension roller 32 and the third tension roller 33 are rotated counterclockwise, and the first tension roller 31 and the fourth tension roller 34 are rotated clockwise;

Referring to fig. 2, when the rewinding (rewinding, i.e., the moving and conveying of the pole piece from the winding roller to the recovery roller) operation is continued for the pole piece 6 subjected to the coating and rolling and winding operation, the recovery roller 1 rotates counterclockwise, the winding roller 5 rotates clockwise, the second tension roller 32 and the third tension roller 33 rotate clockwise, and the first tension roller 31 and the fourth tension roller 34 rotate counterclockwise.

In the utility model, pole piece through holes reserved on the left and right side walls of the main shell 100 of the optical sorting system 2 are symmetrically distributed.

The main housing 100 of the optical sorting system 2 is a sealed housing, except for the left and right sides where pole piece through holes are reserved.

In the present utility model, in particular, the portion of the pole piece 6 between the fourth tension roller 34 and the winding roller 5, transversely passes through the gap between the first guide roller 41 and the second guide roller 42;

the first guide roller 41 and the second guide roller 42 are vertically symmetrically distributed and longitudinally placed;

Referring to fig. 1, when the winding (winding, i.e., the moving and conveying of the pole piece from the recovery roller to the winding roller) operation is performed on the pole piece 6 previously coated and rolled, the first guide roller 41 rotates counterclockwise, and the second guide roller 42 rotates clockwise;

Referring to fig. 2, when the rewinding (rewinding, i.e., the moving and conveying of the pole piece from the winding roller to the recovery roller) operation is continued for the pole piece 6 subjected to the coating and rolling and winding operation, the first guide roller 41 rotates clockwise and the second guide roller 42 rotates counterclockwise;

In particular, the first guide roller 41 and the second guide roller 42 have the same shape and size;

The recovery roller 1 is used for conveying the pole piece 6 obtained in advance by the winding mode to the left. The first guide roller 41 and the second guide roller 42 are winding deviation rectifying structure designs on the existing winding machine, and are well known and mature technologies, and are not described herein.

In the present utility model, the second tension roller 32 is located below the left side of the first tension roller 31;

The third tension roller 33 is located on the right side of the second tension roller 32;

The fourth tension roller 34 is located above the left side of the third tension roller 33 and at the same time to the right side of the first tension roller 31;

in the present utility model, in particular, the first tension roller 31 and the second tension roller 32 are alternately arranged;

the third tension roller 33 and the fourth tension roller 34 are alternately arranged;

The second tension roller 32 and the third tension roller 33 are installed at the same height;

The first tension roller 31 and the fourth tension roller 34 are installed at the same height;

In particular, the second tension roller 32 and the third tension roller 33 are located in a direction opposite to (i.e., outside) the first tension roller 31 and the fourth tension roller 34.

In particular, the bottom of the winding roller 5, the top of the first tension roller 31, the top of the fourth tension roller 34 and the top of the second guide roller 42 are positioned on the same plane, and the heights are the same;

in particular, the shapes and the sizes of the recovery roller 1 and the winding roller 5 are the same;

The first tension roller 31, the second tension roller 32, the third tension roller 33 and the fourth tension roller 34 are the same in shape and size;

in the present utility model, the roll bodies such as the recovery roll 1, the first tension roll 31, the second tension roll 32, the third tension roll 33, the fourth tension roll 34, the first guide roll 41, the second guide roll 42, and the winding roll 5 are all longitudinally distributed, and their rotation driving structure designs are conventional designs on the existing battery pole piece winding machine, and are mature known techniques in the prior art, and are not repeated here.

For example, the front ends or the rear ends of the recovery roller 1, the first tension roller 31, the second tension roller 32, the third tension roller 33, the fourth tension roller 34, the first guide roller 41, the second guide roller 42, and the winding roller 5 are respectively connected with a driving device in a linkage manner (for example, connected with an output shaft of a motor through a coupling), and are driven by the driving device to rotate in a corresponding direction (clockwise or counterclockwise rotation, particularly, see an arrow direction shown in fig. 1). Of course, the corresponding support frame supports the driving device and the roller bodies. Since the support structure is a conventional structure, the description is not specifically expanded herein.

In the utility model, the pole piece 6 is a pole piece which is obtained by coating (namely, the battery pole piece slurry is coated on the battery pole piece substrate), rolling and winding by a winding roller in sequence in advance;

in the present utility model, in particular, the optical sorting system 2 includes a main housing 100;

a first camera 21 and a second camera 22 are mounted in the main housing 100;

A first camera 21 and a second camera 22, respectively located directly above and directly below the pole piece 6;

the first camera 21 and the second camera 22 are respectively used for scanning and photographing the upper and lower side surfaces of the pole piece, and each frame of scanning photograph is recorded.

In particular implementation, nitrogen is filled in the main shell of the optical sorting system 2;

in particular, a first circulation dust collector 23 and a second circulation dust collector 24 are also arranged in the main shell of the optical sorting system 2;

A first circulation dust collector 23 positioned below the right side of the first camera 21 and above the left side of the pole piece through hole reserved on the right side of the main housing of the optical sorting system 2;

The second circulation dust collector 24 is located above the right side of the second camera 22 and below the left side of the pole piece through hole reserved on the right side of the main housing of the optical sorting system 2.

In particular, the first circulation dust collector 23 and the second circulation dust collector 24 are mature and conventional circulation dust collectors in the prior art, and are installed in a conventional manner, which is not described herein.

In the present utility model, the first camera 21 and the second camera 22 are conventional photographing devices, and are known techniques, and are not described herein.

In order to more clearly understand the technical scheme of the present utility model, the working principle of the present utility model is described below.

In the first stage, the winding operation of the pole piece is executed, and the specific steps are as follows:

Firstly, the recovery roller 1 rotates clockwise to transfer the pole piece 6 obtained in advance by coating (i.e. the battery pole piece slurry is coated on the battery pole piece substrate) and rolling, so that the pole piece 6 passes through pole piece through holes reserved on two sides of the main shell of the optical sorting system 2, and meanwhile, the first circulating dust collector 23 and the second circulating dust collector 24 are started to work for circularly filtering foreign matters on the surface of the pole piece.

Wherein, the inside of the main shell of the optical sorting system 2 is filled with nitrogen;

Secondly, the pole piece 6 passes through the four tension rollers of the first tension roller 31, the second tension roller 32, the third tension roller 33 and the fourth tension roller 34 in sequence, so as to ensure the running and moving stability of the pole piece.

Then, the pole piece 6 is subjected to deviation correction by two guide rollers (i.e., a first guide roller 41 and a second guide roller 42) included in the deviation correcting device.

Then, next, the winding roller 5 winds the pole piece 6 subjected to the deviation correction.

Meanwhile, the first camera 21 and the second camera 22 can ensure that the recovery roller 1 and the winding roller 5 stop acting simultaneously after the tail winding of the pole piece 6 is completed through laser length measurement compensation. This is a function of the optical sorting system itself, and will not be described in detail here.

And in the second stage, the rewinding operation of the pole piece is executed, and the method is concretely as follows:

After the recovery roller 1 and the winding roller 5 stop acting, the reverse rotation is started, the recovery roller 1 rotates anticlockwise and is used for conveying the pole piece 6 obtained in a coating mode (namely, the battery pole piece slurry is coated on a battery pole piece substrate), a rolling mode, a winding mode and a rewinding mode, and the pole piece is subjected to deviation correction through two guide rollers (namely, a first guide roller 41 and a second guide roller 42) of a deviation correcting device;

Then, the pole piece 6 after deviation correction is conveyed to the direction of the recovery roller 1 through four tension rollers, namely a fourth tension roller 34, a third tension roller 33, a second tension roller 32 and a first tension roller 31 in sequence, so that the running stability of the pole piece is ensured.

Then, the pole pieces are transferred into the optical sorting system 2, the first camera 21 and the second camera 22 installed in the main shell of the optical sorting system 2 are provided with laser length measuring devices, the length of the pole pieces 6 can be fixed, particularly, slurry coatings (particularly, slurry coatings with preset length) on the upper surface and the lower surface of the pole pieces 6 are photographed, optical image collection (photographing) is carried out, the obtained photos are taken as special photos for flexibility test of the pole pieces 6, the special photos for flexibility test are used for analyzing the flexibility of pole pieces of lithium batteries, and particularly, the final flexibility test results of the pole pieces are obtained through staff analysis.

The optical sorting system 2 is equipment which is put into use in the technical field of batteries and is mature in technology, for example, an area array camera with the model of MV-CS060-10GM/C which is seen by sea Conway can be adopted as the optical sorting system 2, the surface morphology of a pole piece can be photographed in real time, and photographs obtained through photographing can be recorded.

It should be noted that, for the utility model, for the special photo (including the photo of the upper and lower sides of the pole piece) for flexibility test, the photo is observed by human eyes manually by staff, and the photo is analyzed and judged to judge whether the flexibility of the pole piece is qualified or not, and whether the flexibility meets the requirement or not.

For example, when a special photo for flexibility test shows: the width and/or area of the folds (or wrinkles) on either side (upper or lower) of the pole piece exceeds a pre-required threshold, the flexibility of the pole piece is considered to be unacceptable, for example, the area of the folds (or wrinkles) is greater than or equal to 0.2mm ², or the width of the folds (or wrinkles) is greater than or equal to 0.5mm, and the flexibility of the pole piece is considered to be unacceptable.

The first camera 21 and the second camera 22 can ensure the alignment degree of the head and the tail of the pole piece through laser length measurement compensation. The distance between the cameras and the distance between the gratings and the laser source can be adjusted, so that the distance is a function of the optical sorting system in the prior art, and the distance is not repeated here.

The first and second circulation cleaners 23 and 24 are installed near the camera for circulating filtering foreign materials generated at the time of winding and rewinding while photographing the pole piece.

Wherein, the inside of the main shell of the optical sorting system 2 is filled with nitrogen;

In the present utility model, the nitrogen gas has the following functions: firstly, nitrogen is used as inert gas, so that potential safety hazards caused by high dust concentration in local areas can be prevented; and secondly, the nitrogen is used as recycling gas and can be used as a dust removal transmission medium of the circulating dust collector.

Finally, the pole piece subjected to optical sorting by the optical sorting system 2 is a defective test pole piece subjected to a destructive test, and the test pole piece is a pole piece (a creased pole piece) obtained by coating and rolling, winding (winding, namely, moving and conveying the pole piece from a recycling roller to a winding roller) and rewinding (rewinding, namely, moving and conveying the pole piece from the winding roller to the recycling roller) modes, and is wound by the recycling roller 1 rotating anticlockwise.

In the present utility model, the following is required: the pole pieces photographed by the first camera 21 and the second camera 22 are required to be pole pieces (creased pole pieces) obtained by coating and rolling, winding (winding, i.e., moving and conveying the pole pieces from the recovery roller to the winding roller) and rewinding (rewinding, i.e., moving and conveying the pole pieces from the winding roller to the recovery roller) for the following reasons:

Firstly, the application object of the device is a pole piece generated in the normal production process, and the production process is as follows: coating (previous step), rolling (previous step), winding (step of generating crease) and (pole piece for test);

Secondly, the normal production does not include the rewinding process, but the crease generation source is the winding process, so that the rewound operation is carried out on the wound pole piece for convenient observation, the crease morphology and the crease quantity generated in the pole piece are observed, and the flexibility of the pole piece is judged by taking the crease morphology and the crease quantity as judgment bases.

In summary, the utility model has scientific design, winds and rewinds the pole piece obtained by adopting continuous coating and rolling modes and automatically photographs the pole piece by simulating the winding action of the winding machine for production, is used for analyzing the flexibility of the pole piece of the lithium battery so as to facilitate the follow-up battery production process, and has great production practice significance.

The foregoing is merely a preferred embodiment of the present utility model and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present utility model, which are intended to be comprehended within the scope of the present utility model.

Claims (10)

1. The utility model provides a lithium cell pole piece pliability testing arrangement which characterized in that includes: a recovery roller (1), an optical sorting system (2), a first tension roller (31), a second tension roller (32), a third tension roller (33), a fourth tension roller (34), a first guide roller (41), a second guide roller (42) and a winding roller (5);

a winding roller (5) positioned on the right side of the recovery roller (1);

the right end of a pole piece (6) is wound on the circumferential outer wall of the winding roller (5);

The left end of the pole piece (6) is wound on the circumferential outer wall of the recovery roller (1);

The pole piece (6) is positioned between the winding roller (5) and the recovery roller (1) and sequentially wound through the outer walls of the first tension roller (31), the second tension roller (32), the third tension roller (33) and the fourth tension roller (34) from left to right;

Wherein, the pole piece (6) is positioned at the part between the recovery roller (1) and the first tension roller (31) and transversely passes through pole piece through holes respectively reserved on the left side wall and the right side wall of the main shell (100) of the optical sorting system (2);

And the optical sorting system (2) is used for collecting optical images of the upper and lower side surfaces of the pole piece (6), and taking the obtained pole piece photo as a photo special for the flexibility test of the pole piece (6).

2. The lithium battery pole piece flexibility test device according to claim 1, wherein when the pole piece (6) which is coated and rolled in advance is subjected to a moving conveying operation from the recovery roller to the winding roller, the recovery roller (1) is rotated clockwise, the winding roller (5) is rotated counterclockwise, the second tension roller (32) and the third tension roller (33) are rotated counterclockwise, and the first tension roller (31) and the fourth tension roller (34) are rotated clockwise;

when the pole piece (6) subjected to the coating, rolling and winding operation is continuously conveyed from the winding roller to the recovery roller, the recovery roller (1) rotates anticlockwise, the winding roller (5) rotates clockwise, the second tension roller (32) and the third tension roller (33) rotate clockwise, and the first tension roller (31) and the fourth tension roller (34) rotate anticlockwise.

3. The lithium battery pole piece flexibility testing device according to claim 1, wherein pole piece through holes respectively reserved on the left side wall and the right side wall of a main shell (100) of the optical sorting system (2) are distributed in a bilateral symmetry mode.

4. A lithium battery pole-piece flexibility testing device according to claim 1, characterized in that the portion of the pole-piece (6) located between the fourth tension roller (34) and the winding roller (5) transversely passes through the gap between the first guide roller (41) and the second guide roller (42);

The first guide roller (41) and the second guide roller (42) are vertically and symmetrically distributed and longitudinally arranged.

5. The lithium battery pole-piece flexibility testing device according to claim 4, characterized in that when the winding operation is performed on the pole piece (6) previously coated and rolled, the first guide roller (41) rotates counterclockwise, and the second guide roller (42) rotates clockwise;

When the rewinding operation is continued on the pole piece (6) subjected to the coating and rolling and winding operation, the first guide roller (41) rotates clockwise, and the second guide roller (42) rotates counterclockwise.

6. The lithium battery pole piece flexibility testing device according to claim 1, characterized in that the second tension roller (32) is positioned below the left side of the first tension roller (31);

the third tension roller (33) is positioned on the right side of the second tension roller (32);

The fourth tension roller (34) is located above the left side of the third tension roller (33) and at the same time to the right side of the first tension roller (31).

7. The lithium battery pole piece flexibility testing device according to claim 1, characterized in that the first tension roller (31) and the second tension roller (32) are arranged alternately;

The third tension roller (33) and the fourth tension roller (34) are arranged in a staggered manner;

The second tension roller (32) and the third tension roller (33) are installed at the same height;

The first tension roller (31) and the fourth tension roller (34) are installed at the same height.

8. The lithium battery pole piece flexibility testing device according to claim 4, characterized in that the bottom of the winding roller (5), the top of the first tension roller (31), the top of the fourth tension roller (34) and the top of the second guide roller (42) are located on the same plane;

The shape and the size of the recovery roller (1) and the winding roller (5) are the same;

The first tension roller (31), the second tension roller (32), the third tension roller (33) and the fourth tension roller (34) are the same in shape and size;

The first guide roller (41) and the second guide roller (42) have the same shape and size.

9. The lithium battery pole piece flexibility testing device according to any of claims 1 to 8, characterized by an optical sorting system (2) comprising a main housing (100);

A first camera (21) and a second camera (22) are mounted in the main housing (100);

A first camera (21) and a second camera (22) respectively positioned right above and right below the pole piece (6);

The inside of the main shell of the optical sorting system (2) is filled with nitrogen.

10. The lithium battery pole piece flexibility testing device according to claim 9, characterized in that a first circulating dust collector (23) and a second circulating dust collector (24) are also arranged in the main shell of the optical sorting system (2);

The first circulating dust collector (23) is positioned below the right side of the first camera (21) and above the left side of a pole piece through hole reserved on the right side of the main shell of the optical sorting system (2);

And the second circulating dust collector (24) is positioned above the right side of the second camera (22) and below the left side of the pole piece through hole reserved on the right side of the main shell of the optical sorting system (2).