阅读说明：本技术 电池极片卷绕生产质量检测方法 (Battery pole piece winding production quality detection method ) 是由 林梓泉 赵悠曼 于 2021-08-26 设计创作，主要内容包括：本发明公开了一种电池极片卷绕生产质量检测方法,其包括极片侧边边缘平直度检测步骤和卷绕步骤。极片侧边边缘平直度检测步骤包括：通过扫描装置逐段对极片的侧边边缘进行平直度扫描；根据扫描所得到的信息与系统预设的标准数据进行比较,判断该极片段的侧边边缘是否存在缺陷；若是,对该极片段进行打标处理,若不是,直接进行收卷或送入到卷绕步骤。卷绕步骤包括：逐段输送极片,检测输送过来的极片段是否含有标记物；若是,则记录当前卷绕操作为不合格品卷绕操作,若不是,则记录为合格品卷绕操作；卷绕装置逐段将极片和隔膜卷绕成电芯,将经不合格品卷绕操作的电芯进行剔除。使用本发明的电池极片卷绕生产质量检测方法能够自动对极片进行全检。(The invention discloses a method for detecting the winding production quality of a battery pole piece, which comprises a pole piece side edge flatness detection step and a winding step. The step of detecting the flatness of the side edge of the pole piece comprises the following steps: scanning the straightness of the side edge of the pole piece section by section through a scanning device; comparing the information obtained by scanning with standard data preset by a system, and judging whether the side edge of the polar segment has a defect; if yes, marking the pole piece section, and if not, directly winding or feeding the pole piece section to a winding step. The winding step comprises: conveying the pole pieces section by section, and detecting whether the conveyed pole piece section contains a marker or not; if so, recording the current winding operation as the unqualified product winding operation, and if not, recording the current winding operation as the qualified product winding operation; and the winding device winds the pole pieces and the diaphragms into the battery cell section by section, and the battery cell subjected to unqualified product winding operation is rejected. The method for detecting the winding production quality of the battery pole piece can automatically carry out full detection on the pole piece.)

1. A method for detecting the winding production quality of a battery pole piece is characterized by comprising the following steps: the method comprises the steps of detecting the flatness of the side edge of a pole piece and winding; wherein, pole piece side edge straightness detection step includes:

scanning the straightness of the side edge of the pole piece section by section through a scanning device;

comparing the information obtained by scanning with standard data preset by a system, and judging whether the side edge of the polar segment has a defect; if yes, marking the pole piece section, and if not, directly winding or feeding the pole piece section to a winding step;

the winding step comprises:

conveying the pole pieces section by section, and detecting whether the conveyed pole piece section contains a marker or not; if so, recording the current winding operation as the unqualified product winding operation, and if not, recording the current winding operation as the qualified product winding operation;

and winding the pole pieces and the diaphragms into the battery cell section by section through a winding device, and removing the battery cell subjected to unqualified product winding operation.

2. The method for detecting the winding production quality of the battery pole piece according to claim 1, wherein the scanning device detects the signal transmission time between the scanning device and the side edge of the pole piece as the information obtained by scanning.

3. The method for detecting the winding production quality of the battery pole piece according to claim 1, wherein the defects comprise that a concave part and/or a convex part exists on the side edge of the pole piece.

4. The method for detecting the winding production quality of the battery pole piece according to claim 1, wherein the scanning device scans the flatness of the side edge of the pole piece to obtain a scanning time T, and standard data preset by a system are in a range [ T-a, T + a ]; if t is not in the range, the detected pole piece section has defects.

5. The battery pole piece winding production quality detection method according to claim 4, characterized in that: the a is an allowable tolerance value, and the T is standard time required for scanning a flat pole piece section.

6. The battery pole piece winding production quality detection method according to claim 1, wherein the marking treatment comprises punching, code spraying, pattern spraying or cutting the side edge of the pole piece.

7. The method for detecting the winding production quality of the battery pole piece according to claim 1, wherein before the scanning device scans the side edges of the pole piece, the pole piece conveying device conveys the pole piece into the scanning device in a sectional manner, and the fed pole piece is loosely placed on the supporting platform, and the two side edges of the pole piece are exposed out of the supporting platform.

8. The method for detecting the winding production quality of the battery pole piece according to claim 7, wherein width detectors are arranged on the left side and the right side of the supporting platform, the width detectors detect the exposed widths of the two side edges of the pole piece after the pole piece is placed on the supporting platform, and the pole piece conveying device performs horizontal adjustment left and right when the width detectors detect that the widths of the two sides of the pole piece are not consistent, so that the exposed widths of the two side edges of the pole piece are equal.

9. The method for detecting the winding production quality of the battery pole piece according to claim 1, wherein the scanning device moves to a position close to the pole piece before the scanning device scans the side edge of the pole piece.

10. The method of claim 9, wherein the mark detection device sends a detection signal to the side edge of the pole piece when detecting the presence or absence of the marker, and determines whether the discharged pole piece segment contains the marker based on whether the detection signal is received.

Technical Field

The invention relates to the field of lithium battery manufacturing, in particular to a method for detecting the winding production quality of a battery pole piece.

Background

In the production process of the lithium battery, the positive plate, the negative plate and the diaphragm need to be wound and coiled to form a tightly connected battery core, and then the battery core is arranged in a battery shell to be injected and sealed to form the finished battery.

Before winding, since a large pole piece wound from a pole piece roll is wide, the large pole piece needs to be cut into small pole pieces having a predetermined width. The edge of the small pole piece after being cut is not straight due to equipment defects or feeding defects. Once the straightness of the edge of the small pole piece exceeds a specified range, the battery core made of the small pole piece has performance or safety risks, and if the distance between the positive pole and the negative pole in an uneven area is too small, when slight lithium precipitation occurs, the precipitated lithium crystal branches can break through the diaphragm to cause short circuit.

Therefore, in order to avoid the above situation, the edge flatness of the small pole piece is generally checked by human hands before the cell winding operation. However, since the pole piece is generally long, it is difficult to perform full inspection on the pole piece, and the accuracy of manual inspection is not high, it is difficult to accurately grasp whether the edge of the pole piece meets the flatness requirement.

Therefore, a method for detecting the winding production quality of a battery pole piece, which can automatically perform full detection on the pole piece, is needed to overcome the above defects.

Disclosure of Invention

The invention aims to provide a battery pole piece winding production quality detection method capable of automatically and fully detecting pole pieces.

In order to achieve the purpose, the method for detecting the winding production quality of the battery pole piece comprises a pole piece side edge flatness detection step and a winding step; wherein, pole piece side edge straightness detection step includes:

scanning the straightness of the side edge of the pole piece section by section through a scanning device;

comparing the information obtained by scanning with standard data preset by a system, and judging whether the side edge of the polar segment has a defect; if yes, marking the pole piece section, and if not, directly winding or feeding the pole piece section to a winding step;

the winding step comprises:

conveying the pole pieces section by section, and detecting whether the conveyed pole piece section contains a marker or not; if so, recording the current winding operation as the unqualified product winding operation, and if not, recording the current winding operation as the qualified product winding operation;

and winding the pole pieces and the diaphragms into the battery cell section by section through a winding device, and removing the battery cell subjected to unqualified product winding operation.

Preferably, the scanning device detects the signal transmission time between the scanning device and the side edge of the pole piece as the information obtained by scanning.

Preferably, the defects comprise the presence of depressed portions and/or raised portions at the side edges of the pole pieces.

Preferably, the scanning device performs flatness scanning on the side edge of the pole piece to obtain a scanning time T, and standard data preset by the system is a range [ T-a, T + a ]; if t is not in the range, the detected pole piece section has defects.

Preferably, a is an allowable tolerance value, and T is a standard time required for scanning a flat pole piece segment.

Preferably, the marking treatment includes punching, code spraying, pattern spraying or cutting the side edge of the pole piece.

Preferably, before the scanning device scans the side edge of the pole piece, the pole piece conveying device conveys the pole piece into the scanning device in a sectional manner, and the fed pole piece is placed on the supporting platform in a loose manner, and two side edges of the pole piece are exposed out of the supporting platform.

Preferably, the left side and the right side of the support platform are provided with width detectors, the width detectors detect the exposed widths of the two side edges of the pole piece after the pole piece is placed on the support platform, and the pole piece conveying device performs horizontal adjustment left and right when the width detectors detect that the widths of the two sides of the pole piece are not consistent, so that the exposed widths of the two side edges of the pole piece are equal.

Preferably, before the scanning device scans the side edge of the pole piece, the scanning device moves to a position close to the pole piece.

Preferably, when the presence or absence of the marker is detected, the marker detecting device sends a detection signal to the side edge of the pole piece, and determines whether the released pole piece segment contains the marker according to whether the detection signal is received or not.

Compared with the prior art, the method for detecting the winding production quality of the battery pole piece comprises the step of detecting the straightness of the side edge of the pole piece and the step of winding. Wherein, pole piece side edge straightness detection step includes: the method comprises the steps of scanning the flatness of the side edge of a pole piece section by section through a scanning device, comparing information obtained through scanning with standard data preset by a system, and judging whether the pole piece section has defects or not; if yes, marking the pole piece section, and if not, directly winding or feeding the pole piece section to a winding step. After the scanning device scans the side edge of the pole piece section by section, the flatness information of the whole roll of pole piece can be obtained, and the whole detection of the whole roll of pole piece is realized. After a certain section of pole piece is scanned, the scanned information is compared with standard data preset by a system, whether the pole piece section is defective or not can be obtained in real time, whether the side edge of the pole piece section has an uneven area or not can be known, quick response is achieved, then the pole piece section with the uneven area is marked, and the defect of the pole piece section can be clearly known. The winding step comprises: conveying the pole pieces section by section, and detecting whether the conveyed pole piece section contains a marker or not; if so, recording the current winding operation as the unqualified product winding operation, and if not, recording the current winding operation as the qualified product winding operation; and winding the pole pieces and the diaphragms into the battery cell section by section through a winding device, and removing the battery cell subjected to unqualified product winding operation. The pole pieces are conveyed section by section, and whether the conveyed pole pieces have markers or not can be conveniently checked. In order to ensure that production is not suspended due to the defects of the pole pieces and the processing efficiency is ensured, the winding device firstly winds the pole pieces (including the positive pole pieces and the negative pole pieces) and the diaphragms into the battery cells, the battery cells subjected to unqualified product winding operation form unqualified products, and after the unqualified products are removed, the unqualified products can be prevented from flowing out, and the product quality is ensured.

Drawings

Figure 1 is a schematic diagram of the work flow of producing cells according to the present invention.

Fig. 2 is a schematic perspective view of the pole piece conveying device conveying the pole piece into the scanning device.

FIG. 3 is a schematic diagram of a scanning device and a punch cooperating to perform flatness detection on the side edge of a pole piece.

FIG. 4 is a schematic diagram of the configuration of the up-down driver driving the scanning device and distance detector away from the pole piece on the loading table.

FIG. 5 is a schematic diagram of the up-down driver driving the scanning device and the distance detector close to the pole piece on the loading platform.

Fig. 6 is a schematic perspective view of the upper and lower drivers in fig. 5 after being hidden.

Fig. 7 is a perspective view of the up-down driver.

Fig. 8 is a schematic structural view of the mark detection device for detecting the presence or absence of a marker on a pole piece (with a through hole).

FIG. 9 is a schematic structural diagram of a marker detection device for detecting the presence or absence of a marker on a pole piece (without a through hole).

FIG. 10 is a schematic plan view of the pole piece to be tested.

Detailed Description

In order to explain technical contents and structural features of the present invention in detail, the following description is made with reference to the embodiments and the accompanying drawings.

As shown in FIG. 1, the method for detecting the winding production quality of the battery pole piece comprises a pole piece side edge flatness detection step and a winding step. Wherein, pole piece side edge straightness detection step includes: the method comprises the steps that the straightness scanning is carried out on the side edge of a pole piece section by section through a scanning device 10, and whether the pole piece section has defects or not is judged according to the comparison between information obtained by scanning and standard data preset by a system; if yes, marking the pole piece section, and if not, directly winding or feeding the pole piece section to a winding step. After the scanning device 10 scans the side edge of the pole piece section by section, the flatness information of the whole roll of pole piece can be obtained, and the whole detection of the whole roll of pole piece is realized. After a certain section of pole piece is scanned, the scanned information is compared with standard data preset by a system, whether the pole piece section is defective or not can be obtained in real time, whether the side edge of the pole piece section has an uneven area or not can be known, quick response is achieved, then the pole piece section with the uneven area is marked, and the defect of the pole piece section can be clearly known. The winding step comprises: conveying the pole pieces section by section, and detecting whether the conveyed pole piece section contains a marker or not; if so, recording the current winding operation as the unqualified product winding operation, and if not, recording the current winding operation as the qualified product winding operation; the pole pieces and the diaphragms are wound into the battery cells section by section through the winding device 20, and the battery cells subjected to unqualified product winding operation are removed. The pole pieces are conveyed section by section, and whether the conveyed pole pieces have markers or not can be conveniently checked. In order to ensure that the production is not suspended due to the defects of the pole pieces and the processing efficiency is ensured, the winding device 20 firstly winds the pole pieces (including the positive pole pieces and the negative pole pieces) and the diaphragms into the battery cells, the battery cells subjected to the winding operation of the unqualified products form unqualified products, and the unqualified products can be prevented from flowing out after being removed, so that the product quality is ensured.

It should be noted that, whether the side edge of the pole segment has a defect is determined, so as to determine whether the side edge of the pole segment has an uneven portion. The side edge of the pole segment has defects, which indicate that at least one part of the side edge of the pole segment is not straight.

The detection of the presence or absence of the marker in the polar fragment can be performed by a manual or an automated device, but the present invention is not limited thereto, and the detection is performed by an automated marker detection device 30 to rapidly, efficiently and accurately detect the polar fragment.

As shown in fig. 1 to fig. 3, the scanning device 10 detects the signal transmission time between the scanning device and the side edge of the pole piece as the information obtained by scanning. For example, defects include the presence of concave and/or convex portions of the side edges of the pole pieces. Specifically, the scanning device 10 performs flatness scanning on the side edge of the pole piece to obtain scanning time T, and standard data preset by a system is a range [ T-a, T + a ]; if t is not in the range, the detected pole piece section has defects.

For example, the scanning device 10 sends a signal to the side edge of the pole piece, the signal is transmitted by the side edge and returns to the scanning device 10, the time elapsed in the whole process is T, if the straightness meets the requirement, the time T obtained by scanning falls within the range [ T-a, T + a ], and the distance from the detection point of the side edge of the corresponding pole piece to the scanning device 10 is a qualified distance. If the time T obtained by scanning exceeds or is less than the range [ T-a, T + a ], the distance from the side edge of the pole segment to the scanning device 10 is unqualified, which is represented by the condition that the side edge is uneven and concave-convex, and the concave-convex degree exceeds the process range.

Preferably, the scanning device 10 comprises a ranging transmitter 11 and a ranging receiver 12. The ranging emitter 11 and the ranging receiver 12 are arranged in tandem, the ranging emitter 11 and the ranging receiver 12 are placed in an inclined manner, and the ranging emitter 11 and the ranging receiver 12 are aligned with the side edges of the pole pieces. During detection, the distance measuring emitter 11 emits a laser signal to the edge of the side edge of the pole piece, after the laser signal is reflected by the edge of the side edge, the signal enters the distance measuring receiver 12, and the time elapsed in the whole process is t. For submitting detection efficiency, reduce because of detecting the time of waiting, scanning device 10 is provided with the multiunit, and multiunit scanning device 10 sets up side by side along the direction of delivery of pole piece, and during the detection, multiunit scanning device 10 simultaneous working can accomplish the detection to the pole piece in short time. The above a is an allowable tolerance value, and T is a standard time required for scanning a flat pole piece section.

As shown in fig. 3, the marking process includes punching, code spraying, pattern spraying or cutting the edge of the side of the pole piece. In the invention, when the side edge of the pole piece has a defect, the puncher 13 is used for punching the section of the pole piece. For example, the punch 13 is a laser punch, but is not limited thereto, and preferably, the punch 13 is disposed between the ranging transmitter 11 and the ranging receiver 12, and the ranging transmitter 11, the ranging receiver 12 and the punch 13 are each electrically connected to the controller 14. When the time T obtained by scanning exceeds or is less than the range T-a, T + a, the puncher 13 punches the pole piece.

As shown in fig. 2, 4, 5 and 6, before the scanning device 10 scans the side edges of the pole pieces, the pole piece conveying device 40 conveys the pole pieces into the scanning device 10 in a sectional manner, and the fed pole pieces are loosely placed on the supporting table 50, and two sides of the pole pieces are exposed out of the supporting table 50. The pole piece placed on the support platform 50 is in a relaxed state, i.e. the pole piece is not tightened any more, so as to accurately detect whether the side edge of the pole piece is uneven or not. Preferably, the pole piece conveyor 40 is tension adjustable, and the tension is reduced when the pole piece conveyor 40 conveys the pole piece segments into the scanning device 10, so that the pole piece segments naturally fall onto the support table 50.

As shown in fig. 4 to 6, width detectors 51 are provided on both left and right sides of the support table 50, the width detectors 51 detect the width of the two exposed sides of the pole piece after the pole piece is placed on the support table 50, and the pole piece conveying device 40 performs horizontal adjustment so that the width of the two exposed sides of the pole piece is equal when the width detectors 51 detect that the widths of the two sides of the pole piece are not the same. The exposed parts of the two side edges of the pole piece are equal in width, so that whether the side edges are uneven or not can be accurately and comprehensively detected. Preferably, the pole piece conveying device 40 is arranged to be adjustable in left-right movement, so as to drive the pole piece to be transversely adjusted in left-right direction.

As shown in fig. 4, 5 and 7, before the scanning device 10 scans the side edge of the pole piece, the scanning device 10 moves to a position close to the pole piece, so that the distance between the scanning device 10 and the side edge of the pole piece to be detected is close enough to ensure the detection accuracy. Preferably, the scanning device 10 and a distance detector 60 are mounted on the output end of the up-down driver 70, the up-down driver 70 drives the scanning device 10 and the distance detector 60 to move up and down, and the distance detector 60 is used to detect the distance between the distance detector 60 and the pole piece, so that the scanning device 10 can move to a position close to the pole piece more accurately. The up-down driver 70 and the distance detector 60 may be of conventional construction, and thus will not be described in detail herein.

As shown in fig. 1, 8, 9 and 10, when detecting the presence or absence of a marker, the marker detecting device 30 sends a detection signal to the side edge of the pole piece, and determines whether or not the pole piece segment fed out contains a marker based on whether or not the detection signal is received. The presence or absence of the marker can be automatically detected at the side edges of the pole pieces by means of the marker detection device 30. For example, the mark detection device 30 includes a mark detection transmitter 31 and a mark detection receiver 32. The mark detection emitter 31 is arranged right above the mark detection receiver 32, the mark detection emitter 31 and the mark detection receiver 32 enclose a space for the circulation of a pole piece (a positive pole piece or a negative pole piece), when a pole piece section has a through hole, a signal sent by the detection emitter 31 passes through the through hole, and the signal is received by the mark detection receiver 32, namely, the pole piece section is marked. Preferably, the mark detection transmitter 31 and the mark detection receiver 32 are of conventional structures, and thus will not be described herein. The marker detection transmitter 31 may be provided in plural, and the plural marker detection transmitters 31 are arranged in line in the conveying direction of the pole piece, and this arrangement enables more efficient detection of the presence or absence of the marker on the pole piece.

After the core operation is rolled up, put load table 80 with electric core and keep in, no matter qualified product or defective work all put load table 80 this moment on keep in, use remove device 90 to remove out the article of will not check, avoid flowing.

The scanning device 10 has the same detection method for the positive plate and the negative plate, and during actual use, one scanning device 10 can be used for detecting the flatness of the positive plate and the negative plate, or two scanning devices 10 can be used for detecting the positive plate and the negative plate respectively.

The production process for processing the battery cell is described as follows: the pole piece conveying device 40 sends pole pieces (positive pole pieces or negative pole pieces) into the scanning device 10 section by section, the tension of the pole piece conveying device 40 is controlled to be reduced, so that the pole pieces are placed on the bearing platform 50 in a flat mode, the two width detectors 51 detect whether the widths of the exposed parts on the two sides of the pole pieces are equal or not, and if the widths of the exposed parts on the two sides of the pole pieces are not equal, the pole piece conveying device 40 conducts fine adjustment in the left-right direction until the widths of the exposed parts on the two sides of the pole pieces are equal. Then, the distance detector 60 works to detect the distance between the distance detector and the pole piece, and the up-down driver 70 is controlled to drive the scanning device 10 and the distance detector 60 to move downward according to the detected distance value, so that the scanning device 10 reaches a position close to the pole piece. The distance measuring emitter 11 sends out signals to the side edge of the pole piece, the signals are sent to the distance measuring receiver 12 through the reflection of the side edge of the pole piece, and the time of the whole process is t. If the straightness of the side edge is satisfactory, the detected time T falls within the range [ T-a, T + a ], and if the detected time T exceeds or is less than the range [ T-a, T + a ], the puncher 13 performs punching processing on the side edge. After the completion, the up-down driver 70 drives the scanning device 10 and the distance detector 60 to move upward, so that the scanning device 10 and the distance detector 60 move upward away from the pole piece, and the next pole piece can be conveniently fed. In the invention, the pole piece subjected to flatness detection is firstly wound and then unwound to be wound.

And then, performing a core winding operation, after the positive plate and the negative plate are discharged, enabling the positive plate and the negative plate to respectively enter the corresponding mark detection device 30, enabling the mark detection emitter 31 to emit a laser signal, if the emitted signal can be received by the mark detection receiver 32, indicating that a through hole is formed in the side edge of the section of the pole piece, and the side edge of the section of the pole piece is not straight, recording that the current winding operation is an unqualified product winding operation, and if the mark detection receiver 32 does not receive the signal all the time, recording that the current winding operation is a qualified product winding operation, and recording that the current winding operation is a qualified product winding operation. The winding device 20 winds the positive plate, the negative plate and the diaphragm into a battery cell, the cutting knife cuts off the positive plate and the negative plate, the wound battery cell is placed on the loading platform 80, and the moving-out device 90 removes unqualified products.

The above disclosure is only a preferred embodiment of the present invention, and should not be taken as limiting the scope of the invention, so that the appended claims are intended to cover all such modifications and changes as fall within the true spirit of the invention.