CN115342725A - Alignment degree detection device, detection method, battery cell manufacturing device and manufacturing method - Google Patents
Alignment degree detection device, detection method, battery cell manufacturing device and manufacturing method Download PDFInfo
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- 238000001514 detection method Methods 0.000 title claims abstract description 174
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 34
- 230000003287 optical effect Effects 0.000 claims abstract description 38
- 238000005516 engineering process Methods 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims description 25
- 238000007731 hot pressing Methods 0.000 claims description 16
- 238000002360 preparation method Methods 0.000 claims description 13
- 238000012545 processing Methods 0.000 claims description 13
- 238000012937 correction Methods 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 8
- 230000004044 response Effects 0.000 claims description 6
- 238000012797 qualification Methods 0.000 claims description 4
- 238000012360 testing method Methods 0.000 claims description 4
- 210000004027 cell Anatomy 0.000 description 84
- 230000008569 process Effects 0.000 description 22
- 238000007689 inspection Methods 0.000 description 15
- 239000011248 coating agent Substances 0.000 description 5
- 238000000576 coating method Methods 0.000 description 5
- 230000011664 signaling Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000003475 lamination Methods 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical class [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 210000005056 cell body Anatomy 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000003698 laser cutting Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Abstract
The invention provides a cell alignment degree detection device and a detection method for a laminated battery, a cell manufacturing device and a cell manufacturing method, wherein a cell comprises positive pole pieces, negative pole pieces and diaphragms positioned between the positive pole pieces and the negative pole pieces which are arranged in a stacking mode; the light source and the optical detection unit are arranged opposite to the battery cell, and light rays from the light source pass through the detection hole and are received by the optical detection unit; the judging unit is connected with the optical detection unit in a signal technology manner and is arranged to judge the qualified alignment degree of the battery cell based on the light received by the optical detection unit; the deviation rectifying unit is in signal technical connection with the judging unit and is set to adjust the battery cell according to the result of the qualified judgment of the alignment degree.
Description
Technical Field
The invention relates to a cell alignment degree detection device and a cell alignment degree detection method for a laminated battery, and a cell manufacturing device and a cell manufacturing method.
Background
The production process of the laminated battery, such as a laminated lithium ion battery, mainly comprises the steps of preparing a pole piece, stacking the pole piece and hot-pressing the pole piece, wherein a preset number of positive pole pieces, a preset number of negative pole pieces and diaphragms positioned between the positive pole pieces and the negative pole pieces are required to be stacked in the pole piece stacking process. If the relative position of each pole piece (e.g., the positive/negative pole pieces relative to each other or the positive pole piece relative to the negative pole piece) cannot meet the production requirements, for example, the positive active coating exceeds the negative active coating, a potential safety hazard is caused to the battery.
Based on this, a laminated battery production process including pole piece alignment detection based on an X-ray detection technology is known from the prior art, wherein the X-ray detection technology needs to be carried on an apparatus for providing X-rays, so that real-time detection of cell alignment during the lamination process may not be achieved. In addition, as the number of electrode layers increases and the current collector becomes thinner, the accuracy of the X-ray detection technique is low and may cause erroneous judgment. Similarly, a cell alignment detection method using high-precision CT is also known from the prior art, however, the detection method is relatively expensive and the detection rate thereof cannot meet the requirement of mass production.
Furthermore, a cell alignment detection method based on image processing is also known from the prior art, namely, a cell image is acquired in real time by means of a CCD camera (charge coupled device camera), for example, during the pole piece stacking process, and the relative position of the positive/negative pole pieces is monitored by a pre-created image processing algorithm. However, this detection method is relatively complex and puts high demands on the data processing load.
Disclosure of Invention
According to various aspects, it is an object of the present invention to provide an improved cell alignment detection apparatus, a corresponding detection method, and an improved cell manufacturing apparatus and cell manufacturing method.
Furthermore, the present invention is also directed to solve or alleviate other technical problems of the prior art.
The invention solves the problems by providing a cell alignment degree detection device for a laminated battery, specifically, the cell comprises a positive pole piece, a negative pole piece and a diaphragm arranged between the positive pole piece and the negative pole piece which are arranged in a stacking manner, wherein the detection device comprises a pole piece processing unit, a light source, an optical detection unit, a judgment unit and a deviation correction unit, wherein at least detection holes are respectively arranged on the positive pole piece and the negative pole piece in a material preparation stage through the pole piece processing unit; the light source and the optical detection unit are arranged opposite to each other with respect to the battery cell, and light from the light source passes through the detection hole and is received by the optical detection unit; the judging unit is connected with the optical detection unit in a signal technology manner and is arranged to judge the qualified degree of the alignment of the battery cell based on the light received by the optical detection unit; the deviation rectifying unit is connected with the judging unit in a signal technology mode and is set to adjust the battery cell according to the result of the qualified judgment of the alignment degree.
According to the detection device provided by one aspect of the invention, one or more detection holes are respectively arranged at the positive pole piece and the negative pole piece, and the judgment unit is configured to judge the qualified degree of alignment of the battery cell based on the size deviation between the actual size and the theoretical size of the light spot formed by the light received by the optical detection unit and the position deviation between the actual position and the theoretical position of the light spot.
According to the detection device provided by one aspect of the present invention, a plurality of detection holes are provided at the positive electrode plate and/or the negative electrode plate, and the determination unit is configured to perform the qualified degree of alignment determination on the battery cell based on the position deviation of the plurality of detection holes relative to the preset theoretical boundary line.
According to the detection device provided by one aspect of the present invention, the size of the detection hole and the theoretical size of the light spot are set based on a pole piece specification value, and the pole piece specification value is used for representing a deviation value between a negative pole piece and a positive pole piece in terms of size.
According to the detection device provided by one aspect of the invention, the deviation rectifying unit is configured to stack an adjusting element for adjusting the position of the pole piece in response to the judging unit detecting that the cell alignment degree is unqualified, or the deviation rectifying unit is configured to remove the cell in response to the judging unit detecting that the cell alignment degree is unqualified.
According to an aspect of the present invention, there is provided the inspection device, wherein the inspection hole is formed in a triangular shape, a circular shape or a rectangular shape.
According to another aspect of the present invention, there is provided a detection method executable by such a detection apparatus, comprising the steps of:
s100: in the pole piece preparation stage, at least one or more detection holes are respectively formed in the positions of the positive pole piece and the negative pole piece;
s200: judging whether the cell alignment is qualified or not based on light rays received by the optical detection unit, wherein the light rays are emitted by a light source and correspondingly pass through the detection hole; and
s300: and responding to the judgment that the alignment degree of the battery cell is unqualified, and adjusting the battery cell.
According to another aspect of the present invention, in step S200, it is determined whether the cell alignment is acceptable based on a size deviation between an actual size and a theoretical size of a light spot generated by light received by an optical detection unit and a position deviation between an actual position and a theoretical position of the light spot.
According to another aspect of the present invention, in the detection method, a plurality of detection holes are formed in the positive electrode sheet and/or the negative electrode sheet, and in step S200, the battery cell is determined to be qualified in terms of alignment degree based on a position deviation of the plurality of detection holes relative to a preset theoretical boundary line.
According to another aspect of the present invention, the size of the detection hole and the theoretical size of the light spot are set based on a pole piece specification value, where the pole piece specification value is used to indicate a deviation value between a negative pole piece and a positive pole piece in terms of size.
According to the detection method provided by the other aspect of the invention, the steps S200 and S300 are executed in the pole piece stacking process and the pole piece position is adjusted in step S300 in response to detecting that the cell alignment degree is unqualified; or steps S200 and S300 are performed after the hot pressing process and the cell is removed in step S300 in response to detecting that the cell alignment is not satisfactory.
According to another aspect of the present invention, in step S100, the inspection hole is formed in a triangular shape, a circular shape, or a rectangular shape.
According to another aspect of the present invention, a cell manufacturing apparatus for a laminated battery is provided, which includes a material preparation unit for preparing a pole piece, a stacking unit for stacking the pole piece and a diaphragm, a hot-pressing unit for hot-pressing the stacked cells, a conveying unit for conveying the cells, and the cell alignment detection apparatus set forth above.
According to another aspect of the present invention, there is provided a cell manufacturing method for a laminated battery, which can be realized by the cell manufacturing apparatus set forth above.
The alignment degree detection device based on the optical physical detection technology replaces a CT type alignment degree detection mode or an image processing type alignment degree detection mode in the prior art, the production cost of the battery cell is obviously reduced, and high detection efficiency can be realized.
Drawings
The above and other features of the present invention will become apparent with reference to the accompanying drawings, in which,
fig. 1 shows a schematic diagram of an embodiment of a cell alignment detection apparatus according to the present invention;
fig. 2 shows the main steps of the cell alignment detection method according to the present invention;
fig. 3 shows an example of a cell alignment pass determined by means of the cell alignment detection method according to the present invention;
fig. 4 shows an example of a cell alignment failure determined by the cell alignment detection method according to the present invention.
Detailed Description
It is easily understood that according to the technical solution of the present invention, a person skilled in the art can propose various alternative structures and implementation ways without changing the spirit of the present invention. Therefore, the following detailed description and the accompanying drawings are merely illustrative of the technical aspects of the present invention, and should not be construed as all of the present invention or as limitations or limitations on the technical aspects of the present invention.
The terms of orientation of up, down, left, right, front, back, top, bottom, and the like referred to or may be referred to in this specification are defined relative to the configuration shown in the drawings, and are relative terms, and thus may be changed correspondingly according to the position and the use state of the device. Therefore, these and other directional terms should not be construed as limiting terms. Furthermore, the terms "first," "second," "third," and the like are used for descriptive and descriptive purposes only and not for purposes of indication or implication as to the relative importance of the respective components.
Referring to fig. 1, an alignment detection apparatus proposed according to an aspect of the present invention is schematically illustrated in a block diagram, and is used for detecting a battery cell 100 of a laminated battery (hereinafter, also simply referred to as a battery for convenience), wherein the battery cell 100 is formed by stacking a preset number of sets of positive electrode pole pieces, negative electrode pole pieces, and separators therebetween and can be rectangular, for example. A positive electrode tab protrudes from one end of the battery cell 100 of the laminated battery and a negative electrode tab protrudes from the other end thereof. The inspection apparatus generally includes a pole piece processing unit for drilling at least the positive/negative pole pieces to form inspection holes 110 (see fig. 3 and 4) at a pole piece preparation stage, a light source 210, an optical inspection unit 220, a judgment unit 230, and a deviation correction unit 240, which, however, is not shown in fig. 1 because it is far from the inspection apparatus in an in-line production facility. The test opening 110 is located in the active coating region, tab region or transition region of the tab to the active coating region of the pole piece, wherein the test opening is preferably located in the tab region. The position of the detection hole is not limited to the above-mentioned solution, and the detection hole can be arranged at any position allowed by the production technology on the premise that the light can pass through the detection hole. Furthermore, it should be noted that the detection aperture penetrates at least the positive and negative pole pieces and optionally the separator (this can depend on the material of the separator). If the septum is a light transmissive material, it optionally does not penetrate or does not penetrate completely through the septum.
Here, the light source 210 is configured to project light toward the battery cells 100 being stacked or having completed the stacking, the light passing through the detection hole 110 of the positive/negative electrode sheet and being received by the optical detection unit 220 opposite to the light source 210. In fig. 1, the light source 210 is disposed on the front surface of the battery cell 100, and the optical detection unit 220 is disposed on the rear surface of the battery cell 100. The light source 210 can involve a conventional incandescent lamp, infrared light source, ultraviolet light source, or other type of radiation source that can pass through the membrane or membrane coating.
The optical detection unit 220 is connected to the determination unit 230 in a signaling manner at one end for signaling a parameter related to the light received thereby to the determination unit 230 of the next stage, which is configured to determine whether the cell alignment is acceptable based on the signal related to the received light. The other end of the determination unit 230 is connected to the deviation correction unit 240 in a signaling manner (e.g., wired or wireless connection) and operates the deviation correction unit 240 to adjust the battery cell. Here, the optical detection unit may be configured as an optical sensor.
The alignment detection device based on the optical physical detection technology replaces a CT type alignment detection mode or an image processing type alignment detection mode in the prior art, the production cost of the battery cell is obviously reduced, and high detection efficiency can be realized.
For example, the alignment detection device can detect the relative position of the pole pieces in real time during the stacking process of the pole pieces, and if the determining unit 230 determines that the alignment is not qualified, the deviation rectifying unit 240 is controlled to adjust the relative position between the pole pieces. In this case, the deviation correction unit 240 may be configured as a stack adjustment element that repositions the pole pieces by moving them.
In another example, the alignment detection device can perform alignment detection on the pole piece after the stacking is completed or after the pole piece hot-pressing process. If the determining unit 230 determines that the alignment is not satisfactory, the deviation correcting unit 240 is operated to remove the cell, for example, from the conveying line, in which case the deviation correcting unit 240 may be configured to remove a clamp, a robot arm, or other type of clamping moving component. The mode can avoid the situation that the relative position of the pole pieces of the stacked battery cells which are not subjected to hot pressing in the transportation process can be changed or the pole pieces of the stacked battery cells are displaced in the hot pressing process due to external influence, so that certain influence is caused on the safety of the battery. Of course, the alignment detection device can also be used for detecting the battery cell during the stacking process of the pole pieces or after the hot-pressing process.
It should be noted here that the concept of "cell alignment" is to be understood in particular as the alignment between the constituent parts of the cell, i.e. it is to be understood as the alignment of the stacked positive pole pieces relative to one another, the alignment of the positive pole pieces relative to the adjacent negative pole pieces or the alignment thereof relative to the separator. Hereinafter, "cell alignment" may also be referred to as pole piece alignment. It should be noted that the size of the detection hole can be flexibly designed according to the current collecting capability of the pole piece, that is, the size can be designed according to the requirement or the requirement of the production process on the premise of meeting the current collecting capability.
The following explains a specific operation of the alignment detection apparatus. Alternatively, the determination unit 230 performs the alignment qualification determination based on the relevant parameters of the light spot formed by the light received by the optical detection unit 220. Specifically, the determination unit 230 calculates a size deviation between an actual size of the formed spot and a preset theoretical size and a position deviation between an actual position of the formed spot and a preset theoretical position. If the size deviation and the position deviation are within the preset threshold, it is determined that the cell alignment is qualified, otherwise, it is determined that the cell alignment is not qualified, and the deviation rectifying unit 240 is operated to adjust or remove the cell 100. The theoretical size of the light spot can be the size of the light spot formed at the optical detection unit 220 after the light from the light source 210 passes through the detection aperture 110 without being blocked (i.e. when the detection apertures 110 of the respective pole pieces are perfectly aligned), and accordingly the theoretical position of the light spot is the theoretical position of the light spot formed at the optical detection unit 220 in this case, or the theoretical position can also relate to the position of the center point of the light spot. If the size of the light spot received by the optical detection unit 220 is smaller, it is determined that the cell alignment is not qualified. And if the actual position deviation of the light spot is large, determining that the cell alignment degree is unqualified. In this detection process, the optical detection unit 220 can transmit the parameter regarding the light spot to the judgment unit 230 of the next stage in an electrical signal manner.
Here, it should be noted that, in addition to the spot parameters, the alignment qualification determination process performed by the determination unit 230 can be based on other parameters, such as the brightness of the light passing through the detection hole 110 or the intensity of the radiation passing through the detection hole 110, and will not be described in detail. In an extreme case, if the optical detection unit 220 does not detect the light passing through the detection hole 110, the determination unit 230 directly determines that the cell alignment is not qualified.
Alternatively, the size of the detection hole 110 and the theoretical size of the light spot can be selected according to a pole piece specification value, wherein the pole piece specification value is used for representing the deviation value of the negative pole piece and the positive pole piece in terms of size. For the lamination process, the negative electrode sheet should be redundantly designed in size with respect to the positive electrode sheet so that the negative electrode sheet covers the positive electrode sheet in the stacked state. The diameter of the inspection hole 110 is at least equal to the gauge of the pole piece, and preferably equal to the gauge. For a laminated battery as a power battery, the diameter of the circular detection hole can be 0.2 to 10mm, preferably 0.5 to 5mm. For example, in the case of a pole piece specification value of 0.5mm, the detection hole at the positive/negative pole piece may have an aperture diameter of about 1mm, and if the size of each light spot formed through the detection hole 110 is not smaller than the difference between the aperture diameter of the detection hole 110 and the pole piece specification value (i.e., not smaller than 0.5 mm), the pole piece alignment is determined to be acceptable. It will be appreciated that in the case of perfect alignment, the spot size (i.e. the theoretical size) should be 1mm.
A plurality of detection holes 110 may be provided on the positive/negative electrode sheet, for example, two detection holes 110 are provided as shown in fig. 3 and 4, respectively. For example, in the case where two detection holes 110 having a spacing of 10mm are provided, if the pitch between the light spots passing through the two detection holes 110 is not smaller than the difference between the spacing and the specification value of the pole piece, the pole piece alignment is determined to be acceptable. In the design scheme with a plurality of detection holes, the pole piece can be prevented from rotating relative to other pole pieces with the same polarity, and the condition that the detection holes are aligned with each other is mistakenly judged that the pole piece alignment degree is qualified, so that the detection efficiency can be improved. This is particularly advantageous in arrangements in which the detection opening is located in the region of the pole lug protruding from the cell body.
Alternatively, in order to avoid the type of misjudgment mentioned above, the detection hole 110 can be designed in a special shape other than a regular pattern such as a triangle, a circle, a rectangle, or the like, which is asymmetrical.
For the pole pieces with the same polarity, the determining unit 230 can determine whether the alignment of the pole pieces is qualified more accurately by determining the size parameter of the light spot passing through the detecting hole 110 and the position parameter of the light spot or the distance between the light spots passing through the adjacent detecting holes 110. Further, the determination unit 230 is further configured to determine the alignment degree between the pole pieces with opposite polarities (that is, the alignment degree of the positive pole piece relative to the negative pole piece), which is achieved by providing a plurality of detection holes 110 at the positive pole piece and/or the negative pole piece and the determination unit 230 is configured to perform the qualified determination of the alignment degree of the battery cell based on the position deviation of the plurality of detection holes 110 relative to the preset theoretical boundary line. This is schematically illustrated in fig. 3 and 4 (for ease of understanding, the actual cell is used as an example) in which two detection holes 110 are provided in each of the positive and negative electrode tabs, the dimensions of which are set on the basis of the pole piece specification values as explained above. If the central points of the light spots formed by the light passing through the four detection holes 110 are located at the four corners of the theoretical limit of the rectangle indicated by the dotted line, the determining unit 230 determines that the cell alignment is qualified. If the angular deviation between at least one of the central points of the four light spots and the theoretical boundary line exceeds a preset range, the determining unit 230 determines that the cell alignment is not qualified, where the preset range may depend on the pole piece specification value. For example, if the angular deviation of at least one of the central points of the four light spots from the theoretical boundary line exceeds 0.5mm, the determining unit 230 determines that the cell alignment is not satisfactory and signals the deviation correcting unit to adjust the cell.
In addition, the present invention also relates to a detection method that can be executed by the above-mentioned cell alignment degree detection apparatus, which mainly includes the following steps as shown in fig. 2:
s100: in the pole piece preparation stage, at least one or more detection holes are respectively formed in the positions of the positive pole piece and the negative pole piece;
s200: judging whether the cell alignment is qualified or not based on light rays received by the optical detection unit, wherein the light rays are emitted by a light source and correspondingly pass through the detection hole; and
s300: and responding to the judgment that the alignment degree of the battery cell is unqualified, and adjusting the battery cell.
It should be noted that the above-mentioned (and the following-mentioned) step names are only used for distinguishing between steps and for facilitating the reference of the steps, and do not represent the sequential relationship between the steps, and the flow charts including the figures are only examples for performing the method. Steps may be performed in various orders or simultaneously, without significant conflict.
The alignment detection method based on the optical physical detection technology replaces a CT type alignment detection mode or an image processing type alignment detection mode in the prior art, obviously reduces the production cost of the battery cell and can realize higher detection efficiency.
In step S100, a mechanical die cutting or a laser cutting forming may be used for the detection holes 110. The inspection hole 110 may be formed by a separate process after the pole piece is formed, or may be integrally formed during the pole piece stamping process, wherein the latter is preferred because of the process savings and the high dimensional accuracy of the formed inspection hole.
In step S200, it is determined whether the cell alignment is acceptable based on a size deviation between an actual size and a theoretical size of a light spot generated by light received by the optical detection unit 220 and a position deviation between an actual position and a theoretical position of the light spot. By combining the dimensional deviation and the positional deviation, erroneous determination can be effectively avoided and thus detection efficiency can be improved.
A plurality of detection apertures 110 are provided in at least one of the positive and negative pole pieces (i.e., on the positive pole piece or on the negative pole piece or on both), wherein pole pieces of the same polarity are identically constructed and shaped. Correspondingly, in step S200, the cell is subjected to the qualification judgment of the alignment degree based on the position deviation of the plurality of detection holes relative to the preset theoretical boundary line. Here, whether positive pole piece aligns for the negative pole piece can be discerned effectively through the position information that has a plurality of inspection holes and the inspection hole of the pole piece of survey opposite polarity for the pole piece is attached to the pole piece to realize the comprehensive detection to electric core alignment degree.
In addition, the alignment detection method can be executed in the pole piece stacking process, namely the steps S200 and S300 are executed in the pole piece stacking process, so that the pole piece stacking process can be adjusted in time; or the detection method is executed under the state that the hot-pressing molding is carried out and the positions among the pole pieces are not changeable, so as to eliminate the influence of the hot-pressing and conveying processes on the alignment degree of the battery core. For the sake of simplicity and clarity, the description of the alignment detection method according to the present invention can correspondingly refer to the above description of the alignment detection apparatus, which is not repeated herein.
In addition, the invention also provides a battery core manufacturing device for the laminated battery, which comprises a material preparation unit, a stacking unit, a hot pressing unit, a conveying unit and the detection device, wherein the material preparation unit is used for preparing the pole pieces and the diaphragms according to preset sizes, the stacking unit is used for assembling the pole pieces and the diaphragms in a laminating manner, the hot pressing unit is used for carrying out hot pressing assembly on the stacked battery cores, the conveying unit is used for conveying the pole pieces or the battery cores among various working procedures, and the detection device is used for monitoring the alignment degree of the battery cores. The pole piece processing unit of the inspection device is arranged adjacent to a stock preparation unit, which can be integrated in the stock preparation unit (for example in an embodiment in which the inspection opening is formed integrally with the pole piece) or which is arranged after the stock preparation unit (for example in an embodiment in which the inspection opening is produced in a separate process). The other components of the detection device, besides the pole piece processing unit, can be arranged adjacent to the stacking unit or after the hot-pressing unit. The stacking unit may be constructed in the type of a robot arm or a gripper; the transport unit can be configured, for example, as a conveyor belt. The cell manufacturing apparatus can have the features and advantages explained above, and accordingly, reference is made to the description of the alignment degree detection apparatus and the detection method according to the present invention, which will not be repeated.
Finally, the invention relates to a cell production method for a laminated battery, which can be carried out with the aid of the cell production device described above. The cell manufacturing method can have the above features and advantages, and further description thereof will be omitted with reference to the description of the alignment degree detection apparatus, the detection method, and the cell manufacturing apparatus according to the present invention.
In summary, the alignment detection apparatus based on the optical physical detection technology replaces the CT-type alignment detection method or the image processing-type alignment detection method in the prior art, so that the production cost of the battery cell is significantly reduced and higher detection efficiency can be achieved. In an embodiment of the present invention, the alignment of the pole pieces with the same polarity can be detected by evaluating the relevant parameters of the light passing through the detection holes of the pole pieces with the same polarity. In another embodiment of the invention, the detection of the alignment of pole pieces of opposite polarity can be achieved by evaluating parameters associated with light passing through the detection apertures of pole pieces of opposite polarity. In another embodiment of the invention, the false judgment probability can be reduced by arranging a plurality of detection holes on the same pole piece.
It should be understood that all of the above preferred embodiments are exemplary and not restrictive, and that various modifications and changes in the specific embodiments described above, which would occur to persons skilled in the art upon consideration of the above teachings, are intended to be within the scope of the invention.
Claims (10)
1. A cell alignment degree detection device for a laminated battery is characterized in that a cell comprises a positive pole piece, a negative pole piece and a diaphragm, wherein the positive pole piece and the negative pole piece are arranged in a stacking mode, the diaphragm is located between the positive pole piece and the negative pole piece, the detection device comprises a pole piece processing unit, a light source, an optical detection unit, a judgment unit and a deviation correction unit, and detection holes are at least formed in the positive pole piece and the negative pole piece respectively through the pole piece processing unit in a material preparation stage; the light source and the optical detection unit are arranged opposite to the battery cell, and light from the light source passes through the detection hole and is received by the optical detection unit; the judging unit is connected with the optical detection unit in a signal technology manner and is arranged to judge the qualified degree of the alignment of the battery cell based on the light received by the optical detection unit; the deviation rectifying unit is in signal technical connection with the judging unit and is set to adjust the battery cell according to the result of the qualified judgment of the alignment degree.
2. The detection apparatus according to claim 1, wherein one or more detection holes are provided at the positive electrode and the negative electrode, respectively, and the determination unit is configured to perform the alignment degree acceptance determination on the battery cell based on a size deviation of an actual size of a light spot formed by light received by the optical detection unit from a theoretical size and a position deviation of an actual position of the light spot from the theoretical position.
3. The detection device according to claim 2, wherein a plurality of detection holes are provided at the positive electrode plate and/or the negative electrode plate, and the determination unit is configured to perform the alignment qualification determination on the battery cell based on a position deviation of the plurality of detection holes relative to a preset theoretical boundary line.
4. The detecting device according to claim 2, wherein the size of the detecting hole and the theoretical size of the light spot are set based on a pole piece specification value indicating a deviation value in size of the negative pole piece and the positive pole piece.
5. The detection device according to any one of claims 1 to 4, wherein the deviation correction unit is configured to stack an adjustment element for adjusting the position of the pole piece in response to the determination unit detecting that the cell alignment is not satisfactory, or the deviation correction unit is configured to remove a jig for removing the cell in response to the determination unit detecting that the cell alignment is not satisfactory.
6. The testing device according to any of claims 1 to 4, wherein the test wells are configured as triangles, circles or rectangles.
7. A cell alignment detection method for a laminated battery, characterized in that the detection method can be executed by the detection device according to any one of claims 1 to 6, and the detection method comprises the following steps:
s100: in the pole piece preparation stage, at least one or more detection holes are respectively formed at the positions of the positive pole piece and the negative pole piece;
s200: judging whether the cell alignment is qualified or not based on light rays received by the optical detection unit, wherein the light rays are emitted by a light source and correspondingly pass through the detection hole; and
s300: and responding to the judgment that the alignment degree of the battery cell is unqualified, and adjusting the battery cell.
8. The detecting method according to claim 7, wherein in step S200, it is determined whether the cell alignment is acceptable based on a size deviation between an actual size and a theoretical size of a light spot generated by the light received by the optical detecting unit and a position deviation between an actual position and a theoretical position of the light spot.
9. The battery core manufacturing device for the laminated battery is characterized by comprising a material preparation unit for preparing pole pieces, a stacking unit for stacking the pole pieces and diaphragms, a hot pressing unit for hot pressing the stacked battery cores, a conveying unit for conveying the battery cores, and the battery core alignment degree detection device according to any one of claims 1 to 6.
10. A cell manufacturing method for a laminated battery, characterized in that the cell manufacturing method is executable by the cell manufacturing apparatus according to claim 9.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210927485.3A CN115342725A (en) | 2022-08-03 | 2022-08-03 | Alignment degree detection device, detection method, battery cell manufacturing device and manufacturing method |
| PCT/CN2023/109082 WO2024027530A1 (en) | 2022-08-03 | 2023-07-25 | Alignment detection device, detection method, battery cell manufacturing device, and manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202210927485.3A CN115342725A (en) | 2022-08-03 | 2022-08-03 | Alignment degree detection device, detection method, battery cell manufacturing device and manufacturing method |
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| CN115342725A true CN115342725A (en) | 2022-11-15 |
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| CN202210927485.3A Pending CN115342725A (en) | 2022-08-03 | 2022-08-03 | Alignment degree detection device, detection method, battery cell manufacturing device and manufacturing method |
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| CN (1) | CN115342725A (en) |
| WO (1) | WO2024027530A1 (en) |
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| CN116499411A (en) * | 2023-06-28 | 2023-07-28 | 苏州宇量电池有限公司 | Method for detecting alignment degree of pole pieces |
| WO2024027530A1 (en) * | 2022-08-03 | 2024-02-08 | 蔚来汽车科技(安徽)有限公司 | Alignment detection device, detection method, battery cell manufacturing device, and manufacturing method |
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2024027530A1 (en) | 2024-02-08 |
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