CN219180541U - Pole piece, battery with same and electricity utilization device - Google Patents

Abstract

The utility model discloses a pole piece, a battery with the pole piece and an electricity utilization device, wherein the pole piece comprises a current collector and an active layer coated on at least one side surface of the current collector, at least one corner of the pole piece is provided with a corner cutting structure, the corner cutting structure comprises a slope edge, and the slope edge extends to the active layer. According to the pole piece provided by the embodiment of the utility model, the corner cutting structure is constructed on the pole piece, so that after the pole piece is constructed into the laminated body as an example of the laminated lithium ion battery, when the laminated body is irradiated by X rays, the projection of a plurality of relatively clear pole pieces can be obtained on the imaging surface, the uniformity among the plurality of pole pieces is indirectly judged, the detection result is relatively accurate, the operation is simple and convenient, the adverse phenomena such as lithium precipitation and the like of the battery as an example of the laminated lithium ion battery can be avoided, and the safety problem such as the occurrence of fire of the battery as an example of the laminated lithium ion battery can be further avoided.

Description

Pole piece, battery with same and electricity utilization device

Technical Field

The utility model relates to the technical field of batteries, in particular to a pole piece, a battery with the pole piece and an electric device.

Background

In the existing laminated lithium ion battery, if the positive plate or the negative plate is not regular during lamination, the position of the positive plate or the negative plate is deviated, so that the battery is easy to have adverse phenomena such as lithium precipitation and the like, and further the safety problem that the laminated lithium ion battery is easy to cause fire is solved, therefore, the uniformity of the positive plate or the negative plate of the laminated body is required to be detected, however, the accuracy of the uniformity detection of the positive plate or the negative plate in the related art is poor, and therefore, the battery is also caused to have adverse phenomena such as lithium precipitation and the like.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, an object of the present utility model is to provide a pole piece that can make a battery composed of a laminate sheet easily detectable as to the uniformity of a positive or negative pole piece with high accuracy.

The pole piece comprises a current collector and an active layer coated on at least one side surface of the current collector, wherein at least one corner of the pole piece is provided with a corner cutting structure, the corner cutting structure comprises a slope edge, and the slope edge extends to the active layer.

According to the pole piece provided by the embodiment of the utility model, the corner cutting structure is constructed on the pole piece, so that after the pole piece is constructed into the laminated body as an example of the laminated lithium ion battery, when the laminated body is irradiated by X rays, the projection of a plurality of relatively clear pole pieces can be obtained on the imaging surface, the uniformity among the plurality of pole pieces is indirectly judged, the detection result is relatively accurate, the operation is simple and convenient, the adverse phenomena such as lithium precipitation and the like of the battery as an example of the laminated lithium ion battery can be avoided, and the safety problem such as the occurrence of fire of the battery as an example of the laminated lithium ion battery can be further avoided.

In addition, the pole piece according to the utility model can also have the following additional technical characteristics:

optionally, the end of the current collector on which the tab is mounted is further coated with an insulating layer, and the ramp edge extends from the insulating layer to the active layer.

Optionally, the corner cutting structure is a corner cutting structure, the slope edge of the corner cutting structure is a first slope edge, and two ends of the first slope edge are respectively intersected with the end face of the current collector and the side face of the current collector.

Optionally, in a projection plane perpendicular to the width direction of the current collector, a projection length of a superposition part of the first slope edge and the active layer is h1, and the projection length is as follows: h1 is more than 1.5mm.

Optionally, the corner cutting structure is an internal corner cutting structure, the slope edge of the internal corner cutting structure is a second slope edge, the internal corner cutting structure further comprises a cutting edge, the second slope edge extends from the end face of the current collector towards the active layer, the cutting edge extends from the side face of the current collector towards the active layer, the second slope edge and the cutting edge intersect with each other in the active layer, and the second slope edge and the cutting edge intersect in a position arc transition.

Optionally, the cutting edge extends along the width direction of the current collector, and the length d of the cutting edge satisfies: d is less than 0.6mm; in a projection plane perpendicular to the width direction of the current collector, the projection length of the superposition part of the second slope edge and the active layer is h2, and the requirements are satisfied: h2 > 1.5mm.

Optionally, the chamfer structure is an arc chamfer structure, and the slope side of the arc chamfer structure is an arc side.

Optionally, the pole piece is rectangular sheet structure, four corners of pole piece all are provided with the chamfer structure.

The application also provides a battery with the pole piece.

According to the battery provided by the utility model, after the pole piece is constructed into the battery, when the X-rays irradiate the battery, the projection of a plurality of clear pole pieces can be obtained on the imaging surface, so that the uniformity among the plurality of pole pieces is indirectly judged, the detection result is accurate, the operation is simple and convenient, the adverse phenomena such as lithium precipitation and the like of the battery can be avoided, and the safety problem of fire of the battery is further avoided.

The application also provides an electric device with the battery of the embodiment.

According to the power utilization device provided by the embodiment of the utility model, the battery provided by the embodiment is not easy to cause adverse phenomena such as lithium precipitation and the like, so that the safety problem of ignition of the power utilization device caused by ignition of the battery can be well avoided.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

fig. 1 is a schematic view of a corner cut structure of a pole piece according to an embodiment of the present utility model as an internal corner cut structure.

Fig. 2 is an enlarged view of the area a in fig. 1.

Fig. 3 is a schematic illustration of a pole piece and X-rays according to an embodiment of the present utility model.

Fig. 4 is a schematic view of a corner cut structure of a pole piece according to an embodiment of the present utility model being a corner cut structure.

Fig. 5 is an enlarged view of region B in fig. 4.

Fig. 6 is a schematic view of a corner cut structure of a pole piece according to an embodiment of the present utility model being a circular arc corner cut structure.

Fig. 7 is a schematic view of the structure of the positive and negative electrode sheet laminates according to an embodiment of the present utility model.

Fig. 8 is a schematic structural view of a pole piece without a chamfer structure.

Reference numerals:

pole piece 1, positive pole piece 11, negative pole piece 12, active layer 13, insulating layer 14, tab 15,

The corner cutting structure 20, the corner cutting structure 2, the first slope edge 21, the inner cutting structure 3, the second slope edge 31, the cutting edge 32, the arc corner cutting structure 4, the arc edge 41,

And X-rays 200.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

In the description of the present utility model, it should be understood that the directions or positional relationships indicated by the terms "front", "rear", "left", "right", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present utility model. 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.

First, regarding the pole piece 1, taking a laminated lithium ion battery as an example, the laminated lithium ion battery includes a laminated body formed by laminating the pole piece 1 and a diaphragm, specifically, a positive pole piece 11, a diaphragm, and a negative pole piece 12 are laminated to form a laminated body, that is, the pole piece 1 stated in the application may be the positive pole piece 11 or the negative pole piece 12.

Further, if the position of the positive electrode sheet 11 or the negative electrode sheet 12 in the laminate sheet is shifted to cause misalignment, a problem such as lithium deposition is likely to occur, and the safety problem of ignition is likely to occur in the laminated lithium ion battery, so that it is necessary to detect the uniformity of the positive electrode sheet 11 or the negative electrode sheet 12 in the laminate sheet.

For the detection of the uniformity of the positive plate 11 or the negative plate 12 of the laminated body, the corners of the laminated body can be irradiated by the X-ray 200, specifically, since the positive plate 11 or the negative plate 12 has a certain opacity, here, the positive plate 11 or the negative plate 12 can absorb light, and the longer the optical path of the positive plate 11 or the negative plate 12 is, the less the X-ray 200 can be transmitted, so that the X-ray 200 presents black projection on the imaging surface after irradiating the positive plate 11 or the negative plate 12, and the uniformity of the positive plate 12 is determined according to the black projection boundary.

However, it will be understood that, referring to an example shown in fig. 8, the pole piece 1 is of a rectangular sheet-like structure, when the X-ray 200 irradiates one angle of the pole piece 1 (no-corner structure), the optical path lengths of the X-ray 200 passing through the positive pole piece 11 are different in the direction perpendicular to the optical axis of the X-ray 200, and therefore, the projection of the pole piece 1 on the imaging surface is made to be a gradual projection from shallow to deep, and as a result, it is not easy to determine the boundary of the projection, and thus the uniformity of the pole piece 1 is not easy to be determined.

Based on this, this application designs a pole piece 1, and this pole piece 1 can be positive pole piece 11, also can be negative pole piece 12 for lamination lithium ion battery can detect positive pole piece 11 or the regularity of negative pole piece 12 relatively easily, and the detection effect definition is good, and the testing result is accurate.

The pole piece 1 of the embodiment of the present utility model is described below with reference to fig. 1 to 7.

As shown in fig. 1, the pole piece 1 according to the embodiment of the present utility model includes a current collector and an active layer 13 coated on at least one side surface of the current collector, that is, the active layer 13 may be coated on one side surface of the current collector, or the active layer 13 may be coated on both sides of the current collector, which is not limited.

Further, at least one corner of the positive plate 1 is provided with a corner cutting structure 20, the corner cutting structure 20 comprises a slope edge, the slope edge extends to the active layer 13, the positive plate 11 of the laminated lithium ion battery is taken as an example for description, and referring to fig. 1 and 3, the positive plate 11 is of a rectangular sheet structure, and four corners of the positive plate 11 are provided with the corner cutting structure 20, therefore, when the corners of the positive plate 11 are irradiated by the X-ray 200, as the corners of the positive plate 11 are provided with the corner cutting structure 20, the corner cutting structure 20 can be better clearly shown on an imaging surface when the X-ray 200 irradiates the corner cutting structure 20, clear projection boundary definition is good, whether the positive plate 11 is orderly can be judged easily, a monitoring result is accurate, and specific principles can refer to the following description of the external corner cutting structure 2 and the internal corner cutting structure 3, and details are not repeated herein.

Of course, it will be appreciated that the electrode sheet 1 may be the negative electrode sheet 12, that is, the negative electrode sheet 12 also has the characteristics of the corner cutting structure 20, so that when the laminated body is irradiated by the X-ray 200, whether the plurality of negative electrode sheets 12 are orderly or not can be obtained on the imaging surface more clearly, so as to obtain the uniformity among the plurality of negative electrode sheets 12.

The corner cutting structure 20 may be provided only at one corner of the pole piece 1, or may be provided at two corners or three corners, which is not limited thereto.

It should be further noted that the X-ray 200 in the above example may be used as the irradiation chamfer structure 20, and other light sources may be used, which is not limited herein.

Therefore, according to the pole piece 1 of the embodiment of the utility model, by constructing the corner cutting structure 20 on the pole piece 1, after the pole piece 1 is constructed as a laminated body such as a laminated lithium ion battery, when the X-ray 200 irradiates the laminated body, the projection of a plurality of relatively clear pole pieces 1 can be obtained on the imaging surface, so that the uniformity among the plurality of pole pieces 1 is indirectly judged, the detection result is relatively accurate, and the operation is simple and convenient.

In some embodiments of the present utility model, the chamfer structure 20 is an external chamfer structure 2, and the slope edge of the external chamfer structure 2 is a first slope edge 21, and two ends of the first slope edge 21 respectively intersect with the end face of the current collector and the side face of the current collector. Referring to fig. 4 and 5, taking the positive plate 11 as an example, it can be understood that when the first slope edge 21 is not parallel to the optical axis, when a plurality of parallel light beams irradiates toward the corner cutting structure 20, since there is a sharp angle between the first slope edge 21 and the side edge of the positive plate 11, further referring to fig. 8, when the light beams irradiate at the sharp angle and penetrate through the sharp angle, a gradual projection is also presented on the imaging surface, and it is not easy to determine the edge of the positive plate 11 that the projection is wanted to represent, so that the first slope edge 21 needs to be parallel to the optical axis of the light beam. It will be appreciated that the inclination angle of the first slope edge 21 may be adjusted according to the inclination angle of the optical axis of the light beam, for example, the inclination angle of the optical axis is 45 °, so that the inclination angle of the first slope edge 21 is also 45 ° when the pole piece 1 is produced, and the optical axis may be adjusted so that the inclination angle of the optical axis is 45 ° when the uniformity of the positive and negative pole pieces 12 in the lamination body is tested, and the inclination angle is only 45 ° here, but not particularly limited thereto, for example, the inclination angle may be 41 °, 44 °, 46 °, 49 °, or the like, and is not enumerated here.

In some embodiments of the present utility model, referring to fig. 5, in a projection plane perpendicular to a width direction of the current collector, a projection length of a portion where the first slope edge 21 overlaps the active layer 13 is h1, and h1 > 1.5mm is satisfied, wherein the width direction of the current collector may refer to a left-right direction shown in fig. 1, and it is understood that only when the X-ray 200 passes through the corner cut structure 20, an optical path is long enough to enable the corner cut structure 20 to project a clear boundary in the projection plane, so in this application, h1 > 1.5mm is enabled. In one example, h1 may be 1.6mm, 1.7mm, 1.8mm, 1.9mm, etc., without limitation.

In some embodiments of the present utility model, referring to fig. 1-3, the corner structure 20 is an internal corner structure 3, the slope edge of the internal corner structure 3 is a second slope edge 31, the internal corner structure 3 further includes a trimming edge 32, the second slope edge 31 extends from the end surface of the current collector toward the active layer 13, the trimming edge 32 extends from the side surface of the current collector toward the active layer 13, the second slope edge 31 and the trimming edge 32 intersect at the active layer 13, the intersection of the second slope edge 31 and the trimming edge 32 is in arc transition, and the second slope edge 31 is parallel to the optical axis of the light beam for detecting uniformity. For the second slope edge 31 and the trimming edge 32 of the internal cutting corner structure 3, reference may be made to an embodiment shown in fig. 1 to 3, where the pole piece 1 is a rectangular sheet structure, the trimming edge 32 extends along the left-right direction, where the length d of the trimming edge 32 may satisfy d < 0.6mm, and the length d of the trimming edge 32 may be 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, etc., without limitation. In the projection plane perpendicular to the width direction of the current collector, the projection length of the overlapping portion of the second slope 31 and the active layer 13 is h2, and satisfies: h2 > 1.5mm (here, the projection principle of the second slope edge 31 and the projection principle and the projection design of the size of the projection length h2 are the same as those of the first slope edge 21, and are not described here again). It will be appreciated that if the length d of the cut edge 32 is large, a progressive projection on the imaging plane is also likely to occur when the X-ray 200 is irradiated, and therefore the length d of the cut edge 32 cannot be made too large, and the length d of the cut edge 32 and the projection length h2 satisfying the above conditions do not affect the projection of the corner cut structure 20 to a clearer projection plane edge.

In addition, it should be noted that, here, the corner cutting structure 20 is the external corner cutting structure 2, or the corner cutting structure 20 is the internal corner cutting structure 3, so that the corner cutting structure 20 is configured as the external corner cutting structure 2, or the corner cutting structure 20 is configured as the internal corner cutting structure 3, because the die capable of punching out the internal corner cutting structure 3 or the external corner cutting structure 2 is designed according to the manufacturing cost of the die for punching out the pole piece 1, or according to the assembly requirement of the actual laminated body, and the present utility model is not limited. The design of the round chamfer structure 4 shown in the following description may be designed according to the above-mentioned circumstances, and will not be described in detail.

In some embodiments, referring to fig. 6, the chamfer structure 20 is a circular arc chamfer structure 4, and the slope edge of the circular arc chamfer structure 4 is a circular arc edge 41, that is, when the X-ray 200 is projected toward the circular arc chamfer structure 4, the circular arc chamfer structure 4 can present a clearer projection boundary on the imaging plane, so as to better judge the uniformity of the pole piece 1.

Referring to a specific example shown in fig. 1, the pole piece 1 is in a rectangular sheet structure, and corner cutting structures 20 are disposed at four corners of the pole piece 1, so that the uniformity of the pole piece 1 can be determined by well irradiating any one corner of the pole piece 1, and it is understood that the pole piece 1 can also be in other structural forms, such as a trapezoid sheet structure, a pentagon sheet structure, a hexagon sheet structure, and the like, which are not limited herein.

In some embodiments of the present utility model, the end of the current collector, on which the tab 15 is mounted, is further coated with an insulating layer 14, and referring to fig. 1, the front end of the current collector is coated with the insulating layer 14, and the rear end of the insulating layer 14 is coated with the active layer 13, and the insulating layer 14 can better insulate the tab 15 of the pole piece 1, so that the pole piece 1 can be prevented from being shorted after lamination.

Further, the slope edge extends from the insulating layer 14 to the active layer 13, referring to fig. 1, the front end of the current collector is coated with the insulating layer 14, and the rear end of the insulating layer 14 is coated with the active layer 13, so that when the positive plate 11 is irradiated by the X-ray 200, the positive plate 11 can absorb light better, and a black projection boundary can be clearly presented on an imaging surface, and further, the uniformity among the plurality of pole pieces 1 can be judged better.

In one example, the insulating layer 14 is made of ceramic, specifically, the insulating layer 14 may be made of transparent ceramic, the light absorption of the material is utilized in the X-ray detection imaging, the light absorption of the insulating layer 14 made of transparent ceramic is poor, taking the positive plate 11 as an example, if the chamfer structure 20 falls on the ceramic layer 14 of the positive plate 11, after the imaging surface forms an image, the projection boundaries of the positive plate 11 and the negative plate 12, which are black, may overlap on the imaging surface, so that the positive plate 11 and the negative plate 12 cannot be clearly distinguished, and the uniformity judgment on the positive plate 11 or the negative plate 12 is affected.

The present application also proposes a battery having the pole piece 1 of the above embodiment.

According to the battery provided by the utility model, after the pole piece 1 is configured into the battery, when the X-ray 200 irradiates the battery, the projection of a plurality of clear pole pieces 1 can be obtained on the imaging surface, so that the uniformity among the plurality of pole pieces 1 is indirectly judged, the detection result is accurate, and the operation is simple and convenient, the adverse phenomena such as lithium precipitation and the like of the battery can be avoided, and the safety problem of fire of the battery is further avoided.

The lamination form of the positive electrode sheet 11 and the negative electrode sheet 12 of the present application is shown in fig. 8.

The application also provides an electric device with the battery of the embodiment.

According to the power utilization device provided by the embodiment of the utility model, the battery provided by the embodiment is not easy to cause adverse phenomena such as lithium precipitation and the like, so that the safety problem of ignition of the power utilization device caused by ignition of the battery can be well avoided.

In the description of the present specification, reference to the terms "some embodiments," "optionally," "further," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. The pole piece is characterized by comprising a current collector and an active layer coated on at least one side surface of the current collector, wherein at least one corner of the pole piece is provided with a corner cutting structure, the corner cutting structure comprises a slope edge, and the slope edge extends to the active layer.

2. The pole piece of claim 1, wherein the end of the current collector on which the tab is mounted is further coated with an insulating layer, the ramp edge extending from the insulating layer to the active layer.

3. The pole piece of claim 1, wherein the chamfer structure is an external chamfer structure, the slope edge of the external chamfer structure is a first slope edge, and two ends of the first slope edge respectively intersect with the end face of the current collector and the side face of the current collector.

4. A pole piece according to claim 3, characterized in that, in a projection plane perpendicular to the width direction of the current collector, the projection length of the overlapping portion of the first slope edge and the active layer is h1, and satisfies: h1 is more than 1.5mm.

5. The pole piece of claim 1, wherein the chamfer structure is an inscribed corner structure, the sloped edge of the inscribed corner structure is a second sloped edge, the inscribed corner structure further comprises a cut edge extending from an end face of the current collector toward the active layer, the cut edge extending from a side face of the current collector toward the active layer, and the second sloped edge and the cut edge intersecting at the active layer, the location where the second sloped edge and the cut edge intersect being in a circular arc transition.

6. The pole piece of claim 5, wherein the pole piece comprises a plurality of pole pieces,

the cutting edge extends along the width direction of the current collector, and the length d of the cutting edge meets the following conditions: d is less than 0.6mm;

in a projection plane perpendicular to the width direction of the current collector, the projection length of the superposition part of the second slope edge and the active layer is h2, and the requirements are satisfied: h2 > 1.5mm.

7. The pole piece of claim 1, wherein the chamfer structure is a circular arc chamfer structure and the ramp edge of the circular arc chamfer structure is a circular arc edge.

8. The pole piece of claim 1, wherein the pole piece is a rectangular sheet structure, and four corners of the pole piece are each provided with a corner cutting structure.

9. A battery comprising a pole piece according to any one of claims 1-8.

10. An electrical device comprising the battery of claim 9.

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