Alignment detection device, detection method, battery cell manufacturing device and manufacturing method

Abstract

The present invention provides a cell alignment detection device and a detection method as well as a cell manufacturing device and a manufacturing method for a laminated battery, wherein the cell comprises a stacked positive electrode sheet, a negative electrode sheet and a diaphragm therebetween, wherein the detection device comprises a sheet processing unit, a light source, an optical detection unit, a judgment unit and a deviation correction unit, wherein at least the positive electrode sheet and the negative electrode sheet are respectively provided with detection holes by the sheet processing unit in the material preparation stage; the light source and the optical detection unit are arranged opposite to the cell, and the light from the light source passes through the detection hole and is received by the optical detection unit; the judgment unit is connected to the optical detection unit by signal technology and is configured to make a qualified alignment judgment on the cell based on the light received by the optical detection unit; the deviation correction unit is connected to the judgment unit by signal technology and is configured to adjust the cell according to the result of the qualified alignment judgment.

Description

Technical Field

[0001] The invention relates to a battery cell alignment detection device and a detection method for a laminated battery, and a battery cell manufacturing device and a manufacturing method. Background Art

[0002] The production process of laminated batteries, such as laminated lithium-ion batteries, mainly includes electrode preparation, electrode stacking, and electrode hot pressing. In the electrode stacking process, a preset number of positive electrode sheets, negative electrode sheets, and separators therebetween need to be stacked. If the relative positions of the electrodes (such as the positive / negative electrode sheets relative to each other or the positive electrode sheet relative to the negative electrode sheet) cannot meet the production requirements, such as the positive electrode active coating exceeding the negative electrode active coating, it will cause safety hazards to the battery.

[0003] Based on this, a laminated battery production process that includes pole piece alignment detection based on X-ray detection technology is known from the prior art, wherein the X-ray detection technology needs to be mounted on a device that provides X-rays, so that real-time detection of the alignment of the battery cells 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 technology is low and may cause misjudgment. Similarly, a battery cell alignment detection method using high-precision CT is also known from the prior art, however, this detection method is relatively expensive and its detection rate cannot meet the needs of large-scale production.

[0004] In addition, a method for detecting the alignment of battery cells based on image processing is also known in the prior art, that is, during the electrode stacking process, for example, a CCD camera (charge coupled device camera) is used to collect battery cell images in real time and the relative positions of the positive and negative electrode sheets are monitored through a pre-created image processing algorithm. However, this detection method is relatively complex and places high demands on the data processing load. Summary of the invention

[0005] According to different aspects, the object of the present invention is to provide an improved battery cell alignment detection device, a corresponding detection method, and an improved battery cell manufacturing device and battery cell manufacturing method.

[0006] In addition, the present invention is also intended to solve or alleviate other technical problems existing in the prior art.

[0007] The present invention solves the above-mentioned problem by providing a battery cell alignment detection device for a laminated battery, specifically, the battery cell comprises a stacked positive electrode sheet, a negative electrode sheet and a separator therebetween, wherein the detection device comprises a sheet processing unit, a light source, an optical detection unit, a judgment unit and a correction unit, wherein the sheet processing unit is used to provide at least the positive electrode sheet and the negative electrode sheet with detection holes in the material preparation stage; the light source and the optical detection unit are arranged opposite to the battery cell, and the light from the light source passes through the detection hole and is received by the optical detection unit; the judgment unit is connected to the optical detection unit by signal technology and is configured to make a qualified alignment judgment on the battery cell based on the light received by the optical detection unit; the correction unit is connected to the judgment unit by signal technology and is configured to adjust the battery cell according to the result of the qualified alignment judgment.

[0008] According to the detection device proposed in one aspect of the present invention, one or more detection holes are respectively provided at the positive electrode plate and the negative electrode plate, and the judgment unit is configured to make a qualified alignment judgment on 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.

[0009] According to the detection device proposed in one aspect of the present invention, a plurality of detection holes are provided at the positive electrode sheet and / or the negative electrode sheet, and the judgment unit is configured to make a judgment on the alignment of the battery cell based on the position deviation of the plurality of detection holes relative to a preset theoretical boundary.

[0010] According to the detection device proposed in one aspect of the present invention, the size of the detection hole and the theoretical size of the light spot are set based on the pole piece specification value, and the pole piece specification value is used to represent the deviation value in size between the negative pole piece and the positive pole piece.

[0011] According to the detection device proposed in one aspect of the present invention, the correction unit is constructed as a stacking adjustment element for adjusting the position of the pole piece in response to the judgment unit detecting that the battery cell alignment is unqualified, or the correction unit is constructed as a removal fixture for removing the battery cell in response to the judgment unit detecting that the battery cell alignment is unqualified.

[0012] According to the detection device provided in one aspect of the present invention, the detection hole is configured in a triangular, circular or rectangular shape.

[0013] According to another aspect of the present invention, there is provided a detection method which can be performed by such a detection device, comprising the following steps:

[0014] S100: In the electrode material preparation stage, one or more detection holes are formed at least at the positive electrode sheet and the negative electrode sheet respectively;

[0015] S200: judging whether the alignment of the battery cells is qualified based on the light received by the optical detection unit, wherein the light is emitted by the light source and passes through the detection hole accordingly; and

[0016] S300: In response to determining that the alignment of the battery cells is unqualified, adjusting the battery cells.

[0017] According to the detection method proposed in another aspect of the present invention, in step S200, whether the alignment of the battery cells is qualified is judged based on the size deviation between the actual size and the theoretical size of the light spot generated 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.

[0018] According to the detection method proposed in another aspect of the present invention, a plurality of detection holes are provided at the positive electrode sheet and / or the negative electrode sheet. In step S200, the alignment degree of the battery cell is judged based on the position deviation of the plurality of detection holes relative to a preset theoretical boundary.

[0019] According to the detection method proposed in another aspect of the present invention, the size of the detection hole and the theoretical size of the light spot are set based on the pole piece specification value, wherein the pole piece specification value is used to represent the deviation value in size between the negative pole piece and the positive pole piece.

[0020] According to the detection method proposed in another aspect of the present invention, steps S200 and S300 are performed during the electrode stacking process and in step S300, the electrode position is adjusted in response to detecting that the battery cell alignment is unqualified; or steps S200 and S300 are performed after the hot pressing process and in step S300, the battery cell is removed in response to detecting that the battery cell alignment is unqualified.

[0021] According to the detection method proposed in another aspect of the present invention, in step S100, the detection hole is formed into a triangle, a circle or a rectangle.

[0022] According to another aspect of the present invention, there is provided a cell manufacturing device for a laminated battery, which includes a material preparation unit for preparing pole sheets, a stacking unit for stacking pole sheets and diaphragms, a hot pressing unit for hot pressing the stacked battery cells, a conveying unit for transporting the battery cells, and the cell alignment detection device described above.

[0023] According to another aspect of the present invention, a method for manufacturing a battery cell for a laminated battery is provided, which can be implemented by the battery cell manufacturing device described above.

[0024] Instead of the CT-type alignment detection method or the image processing-type alignment detection method in the prior art, the alignment detection device based on optical physical detection technology significantly reduces the production cost of battery cells and can achieve higher detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and other features of the present invention will become apparent with reference to the accompanying drawings, in which:

[0026] Figure 1 A schematic diagram showing an embodiment of a battery cell alignment detection device according to the present invention;

[0027] Figure 2 The main steps of the method for detecting the alignment of a battery cell according to the present invention are shown;

[0028] Figure 3 An example of a battery cell alignment degree being qualified as determined by the battery cell alignment degree detection method according to the present invention is shown;

[0029] Figure 4 An example of unqualified cell alignment determined by the cell alignment detection method according to the present invention is shown. DETAILED DESCRIPTION

[0030] It is easy to understand that according to the technical solution of the present invention, without changing the essential spirit of the present invention, a person skilled in the art can propose a variety of interchangeable structural modes and implementation modes. Therefore, the following specific implementation modes and drawings are only exemplary descriptions of the technical solution of the present invention, and should not be regarded as the whole of the present invention or as a limitation or restriction to the technical solution of the present invention.

[0031] The directional terms such as up, down, left, right, front, back, front, back, top, bottom, etc. mentioned or may be mentioned in this specification are defined relative to the structures shown in the drawings. They are relative concepts and may change accordingly according to their different positions and different usage states. Therefore, these or other directional terms should not be interpreted as restrictive terms. In addition, the terms "first", "second", "third", etc. or similar expressions are only used for description and distinction purposes, and cannot be understood as indicating or implying the relative importance of the corresponding components.

[0032] refer to Figure 1, which schematically shows an alignment detection device proposed according to one aspect of the present invention in a block diagram, which is used to detect a battery cell 100 of a laminated battery (hereinafter referred to as a battery for convenience), wherein the battery cell 100 is stacked by a preset number of multiple groups of positive electrode sheets, negative electrode sheets and separators therebetween and can be, for example, rectangular. A positive electrode tab extends from one end of the battery cell 100 of the laminated battery and a negative electrode tab extends from the other end. The detection device as a whole includes a sheet processing unit, a light source 210, an optical detection unit 220, a judgment unit 230 and a correction unit 240, wherein the sheet processing unit is used to drill holes in at least the positive / negative electrode sheets to form detection holes 110 in the sheet preparation stage (see Figure 3 and Figure 4 ), however, it is not located in the production line because it is far from the detection device. Figure 1 As shown in . The detection hole 110 is located in the active coating area of ​​the pole piece, the pole ear area, or the transition area between the pole ear and the active coating area. Here, preferably, the detection hole is located in the pole ear area. The position of the detection hole is not limited to the above-mentioned solution. It can be set at any position allowed by production technology under the premise that light can pass through. In addition, it should be noted that the detection hole at least penetrates the positive pole piece and the negative pole piece and optionally penetrates the diaphragm (which can depend on the material of the diaphragm). If the diaphragm is a light-transmitting material, it is optional not to penetrate or not to completely penetrate the diaphragm.

[0033] Here, the light source 210 is used to project light toward the battery cells 100 being stacked or completed, and the light passes through the detection holes 110 of the positive / negative plates and is received by the optical detection unit 220 opposite to the light source 210. Figure 1 In the embodiment, the light source 210 is arranged on the front side of the battery cell 100, and the optical detection unit 220 is arranged on the back side of the battery cell 100. The light source 210 can be a common incandescent lamp, an infrared light source, an ultraviolet light source, or other types of radiation light sources that can pass through the diaphragm or diaphragm coating.

[0034] One end of the optical detection unit 220 is connected to the judgment unit 230 by signal technology, so as to transmit the parameters of the light received by it to the judgment unit 230 of the next level in the form of a signal, and the judgment unit is configured to judge whether the alignment of the battery cell is qualified based on the signal about the received light. The judgment unit 230 is connected to the correction unit 240 by signal technology (for example, wired connection or wireless connection) at its other end and controls the correction unit 240 to adjust the battery cell. Here, the optical detection unit can be configured as an optical sensor.

[0035] Instead of the CT-type alignment detection method or the image processing-type alignment detection method in the prior art, the alignment detection device based on optical physical detection technology significantly reduces the production cost of battery cells and can achieve higher detection efficiency.

[0036] For example, the alignment detection device can detect the relative position of the pole pieces in real time during the pole piece stacking process. If the judgment unit 230 determines that the alignment is unqualified, the correction unit 240 is controlled to adjust the relative position between the pole pieces. In this case, the correction unit 240 can be configured as a stacking adjustment element, which repositions each pole piece by moving each pole piece.

[0037] In another example, the alignment detection device can detect the alignment of the battery after the stacking is completed or after the hot pressing process of the pole piece. If the judgment unit 230 determines that the alignment is unqualified, the correction unit 240 is controlled to remove the battery cell, for example, from the conveyor line. In this case, the correction unit 240 can be constructed to remove the clamp, robot arm or other types of clamping moving parts. This method can avoid the following situation, that is, due to external influences, the relative position of the pole pieces of the battery cells that are stacked but not hot pressed during transportation will change or the pole pieces of the stacked battery cells will shift during the hot pressing process, thereby causing a certain impact on the safety of the battery. Of course, the alignment detection device can also be used to detect the battery cells during the stacking process of the pole pieces or after the hot pressing process.

[0038] It should be noted here that the concept of "battery cell alignment" should specifically be understood as the alignment between the components of the battery cell, that is, it can be understood as the alignment of stacked positive electrode sheets relative to each other, the alignment of the positive electrode sheets relative to the adjacent negative electrode sheets, or their alignment relative to the diaphragm. In the following, "battery cell alignment" may also be referred to as electrode sheet alignment. It should also be noted that the size of the above-mentioned detection hole can be flexibly designed according to the current collecting capacity of the electrode sheet, that is, it can be designed according to needs or production process requirements while meeting the current collecting capacity.

[0039] The specific working mode of the alignment detection device is described below. Optionally, the judgment unit 230 makes a qualified alignment judgment based on the relevant parameters of the light spot formed by the light received by the optical detection unit 220. Specifically, the judgment unit 230 calculates the size deviation between the actual size of the formed light spot and the preset theoretical size and the position deviation between the actual position of the formed light spot and the preset theoretical position. If the size deviation and the position deviation are within the preset threshold, the alignment of the battery cell is determined to be qualified, otherwise the alignment of the battery cell is determined to be unqualified and the correction unit 240 is controlled to adjust or remove the battery cell 100. Here, 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 hole 110 without obstruction (that is, when the detection holes 110 of each pole piece are completely 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 involve 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 small, the alignment of the battery cell is determined to be unqualified. If the actual position of the light spot deviates greatly, the alignment of the battery cell is determined to be unqualified. During the detection process, the optical detection unit 220 can transmit the parameters of the light spot to the judgment unit 230 of the next level in the form of an electrical signal.

[0040] Here, it should be noted that, in addition to the above-mentioned light spot parameters, the alignment qualification judgment process performed by the judgment unit 230 can also be based on other parameters, such as the brightness of the light passing through the detection hole 110 or the intensity of the rays passing through the detection hole 110, which will not be described in detail. In extreme cases, if the optical detection unit 220 does not detect the light passing through the detection hole 110, then the judgment unit 230 directly determines that the alignment of the battery cell is unqualified.

[0041] Optionally, the size of the detection hole 110 and the theoretical size of the light spot can be selected depending on the pole piece specification value, wherein the pole piece specification value is used to indicate the deviation value in size between the negative pole piece and the positive pole piece. For the lamination process, the negative pole piece should be redundantly designed in size relative to the positive pole piece so that the negative pole piece covers the positive pole piece in the stacked state. The diameter of the detection hole 110 is at least equal to the pole piece specification value, preferably equal to the specification value. For a laminated battery as a power battery, the diameter of the circular detection hole can be 0.2-10mm, preferably 0.5-5mm. For example, in the case where the pole piece specification value is 0.5mm, the detection hole at the positive / negative pole piece may have an aperture of approximately 1mm, and if the size of each light spot formed by passing through the detection hole 110 is not less than the difference between the aperture of the detection hole 110 and the pole piece specification value (i.e., not less than 0.5mm), the pole piece alignment is determined to be qualified. It should be understood that, under perfect alignment, the size of the light spot (ie, the theoretical size) should be 1 mm.

[0042] A plurality of detection holes 110 may be provided on the positive / negative electrode sheet, for example, 3 and Figure 4 As shown in , there are two detection holes 110 respectively. For example, in the case where two detection holes 110 are provided with an interval of 10 mm, if the spacing between the light spots passing through the two detection holes 110 is not less than the difference between the above spacing and the pole piece specification value, the pole piece alignment is judged to be qualified. In the design scheme with multiple detection holes, it is possible to avoid the situation where the pole piece rotates to a certain extent relative to other pole pieces of the same polarity while the detection holes remain aligned with each other and the pole piece alignment is misjudged as qualified, thereby improving the detection efficiency. This is particularly advantageous in the arrangement scheme where the detection hole is located in the pole ear area extending from the battery body.

[0043] Optionally, in order to avoid the type of misjudgment mentioned above, the detection hole 110 can also be designed to be a special shape other than regular shapes such as triangle, circle, rectangle, etc., and the special shape is asymmetric.

[0044] For pole pieces of the same polarity, by measuring the size parameters of the light spot passing through its detection hole 110 and the position parameters of the light spot or the spacing between the light spots passing through adjacent detection holes 110, the judgment unit 230 can more accurately determine whether the alignment of the pole piece is qualified. Furthermore, the judgment unit 230 is also configured to measure the alignment between pole pieces of opposite polarity (that is, the alignment of the positive pole piece relative to the negative pole piece), which is achieved in the following manner, namely, a plurality of detection holes 110 are provided at the positive pole piece and / or the negative pole piece, and the judgment unit 230 is configured to make a qualified alignment judgment on the battery cell based on the position deviation of the plurality of detection holes 110 relative to a preset theoretical boundary. In this case, Figure 3 and Figure 4 (For ease of understanding, a real battery cell is used as an example for explanation) schematically shown, wherein two detection holes 110 are respectively provided at the positive pole ear and the negative pole ear, and their sizes are set based on the pole piece specification value as described above. If the center points of the light spots formed by the light passing through the four detection holes 110 are at the four corners of the theoretical boundary of the rectangle represented by the dotted line, the judgment unit 230 determines that the alignment of the battery cell is qualified. If the angular deviation of at least one of the center points of the four light spots from the theoretical boundary exceeds a preset range, the judgment unit 230 determines that the alignment of the battery cell is unqualified, wherein the preset range can depend on the pole piece specification value. For example, if the angular deviation of at least one of the center points of the four light spots from the theoretical boundary exceeds 0.5 mm, the judgment unit 230 determines that the alignment of the battery cell is unqualified and controls the correction unit to adjust the battery cell by signal technology.

[0045] In addition, the present invention also relates to a detection method that can be performed by the above-mentioned battery cell alignment detection device, as shown in Figure 2 As shown, it mainly includes the following steps:

[0046] S100: In the electrode material preparation stage, one or more detection holes are formed at least at the positive electrode sheet and the negative electrode sheet respectively;

[0047] S200: judging whether the alignment of the battery cells is qualified based on the light received by the optical detection unit, wherein the light is emitted by the light source and passes through the detection hole accordingly; and

[0048] S300: In response to determining that the alignment of the battery cells is unqualified, adjusting the battery cells.

[0049] It should be noted that the step names mentioned above (and those mentioned below) are only used to distinguish between the steps and facilitate the reference of the steps, and do not represent the order relationship between the steps. The flowcharts including the attached drawings are only examples of executing the present method. In the absence of obvious conflicts, the steps can be executed in various orders or simultaneously.

[0050] Instead of the CT-type alignment detection method or the image processing-type alignment detection method in the prior art, the alignment detection method based on optical physical detection technology significantly reduces the production cost of battery cells and can achieve higher detection efficiency.

[0051] In step S100, the detection hole 110 may be formed by mechanical die cutting or laser cutting. The detection hole 110 may be formed by a separate process after the pole piece is formed, or may be formed in an integrated manner during the pole piece stamping process. The latter is preferred because it saves processes and the size accuracy of the formed detection hole is higher.

[0052] In step S200, whether the alignment of the battery cells is qualified is determined based on the size deviation between the actual size and the theoretical size of the light spot generated by the light received by the optical detection unit 220 and the position deviation between the actual position of the light spot and the theoretical position. The combination of size deviation and position deviation can effectively avoid misjudgment and thus improve detection efficiency.

[0053] At least one of the positive electrode sheet and the negative electrode sheet (i.e., on the positive electrode sheet or on the negative electrode sheet or on both) is provided with a plurality of detection holes 110, wherein the electrode sheets of the same polarity are constructed and formed in the same manner. Accordingly, in step S200, the alignment of the battery cell is judged to be qualified based on the position deviation of the plurality of detection holes relative to the preset theoretical boundary. Here, by assigning a plurality of detection holes to the electrode sheet and measuring the position information of the detection holes of the electrode sheet of the opposite polarity, it is possible to effectively identify whether the positive electrode sheet is aligned with respect to the negative electrode sheet, thereby realizing a comprehensive detection of the alignment of the battery cell.

[0054] In addition, the alignment detection method according to the present invention can be performed during the electrode stacking process, that is, steps S200 and S300 are performed during the electrode stacking process, so as to adjust the electrode stacking process in time; or the detection method is performed in a state where the positions of the electrode sheets cannot be changed during hot pressing, so as to eliminate the influence of the hot pressing and conveying process on the alignment of the battery cell. For the sake of simplicity and clarity, the description of the alignment detection method according to the present invention can refer to the description of the alignment detection device above, and no further description is given.

[0055] In addition, the present invention also provides a cell manufacturing device for laminated batteries, which includes a material preparation unit for preparing pole pieces and diaphragms in preset sizes, a stacking unit for assembling pole pieces and diaphragms in layers, a hot pressing unit for hot pressing and assembling stacked cells, a conveying unit for transporting pole pieces or cells between various processes, and the detection device for monitoring the alignment of cells described above. Here, the pole piece processing unit of the detection device is arranged adjacent to the material preparation unit, which can be integrated into the material preparation unit (for example, in a structural scheme where the detection hole and the pole piece are integrally formed) or it is arranged after the material preparation unit (for example, in a scheme where the detection hole is produced in a separate process). Other components of the detection device except the pole piece processing unit can be arranged adjacent to the stacking unit or arranged after the hot pressing unit. The stacking unit can be constructed in the type of a mechanical arm or a clamp; the conveying unit can be constructed, for example, as a conveyor belt. The cell manufacturing device can have the features and advantages explained above, and the description of the alignment detection device and detection method according to the present invention can be referred to accordingly, and no further description is given.

[0056] Finally, the present invention relates to a method for manufacturing a cell for a laminated battery, which can be performed with the aid of the cell manufacturing device described above. The cell manufacturing method can have the above-mentioned features and advantages, and reference can be made to the description of the alignment detection device, detection method and cell manufacturing device according to the present invention, which will not be repeated here.

[0057] In summary, instead of the CT-type alignment detection method or the image processing-type alignment detection method in the prior art, the alignment detection device based on optical physical detection technology significantly reduces the production cost of battery cells and can achieve higher detection efficiency. In one embodiment of the present invention, by evaluating the relevant parameters of the light passing through the detection holes of the pole pieces of the same polarity, the alignment of pole pieces of the same polarity can be detected. In another embodiment of the present invention, by evaluating the relevant parameters of the light passing through the detection holes of the pole pieces of the opposite polarity, the alignment of pole pieces of the opposite polarity can be detected. In another embodiment of the present invention, by setting multiple detection holes for the same pole piece, the probability of misjudgment can be reduced.

[0058] It should be understood that all the above preferred embodiments are illustrative rather than restrictive, and various modifications or variations made by those skilled in the art to the specific embodiments described above under the concept of the present invention should be within the legal protection scope of the present invention.

Claims

1. A cell alignment detection device for laminated batteries, characterized in that: The battery cell comprises a stacked positive electrode sheet, a negative electrode sheet and a separator therebetween, wherein the detection device comprises a sheet processing unit, a light source, an optical detection unit, a judgment unit and a correction unit, wherein the sheet processing unit is used to provide at least the positive electrode sheet and the negative electrode sheet with detection holes in the material preparation stage; the light source and the optical detection unit are arranged opposite to the battery cell, and the light from the light source passes through the detection hole and is received by the optical detection unit; the judgment unit is connected to the optical detection unit by signal technology and is configured to make a qualified alignment judgment on the battery cell based on the light received by the optical detection unit; the correction unit is connected to the judgment unit by signal technology and is configured to adjust the battery cell according to the result of the qualified alignment judgment. Among them, one or more detection holes are respectively provided at the positive electrode and the negative electrode, and the judgment unit is configured to judge the 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.

2. The detection device according to claim 1, characterized in that: A plurality of detection holes are provided at the positive electrode sheet and / or the negative electrode sheet, and the judgment unit is configured to judge the alignment of the battery cell based on the position deviation of the plurality of detection holes relative to a preset theoretical boundary.

3. The detection device according to claim 1, characterized in that: The size of the detection hole and the theoretical size of the light spot are set based on the pole piece specification value, and the pole piece specification value is used to indicate the deviation value in size between the negative pole piece and the positive pole piece.

4. The detection device according to any one of claims 1 to 3, characterized in that: The deflection correction unit is configured as a stacking adjustment element for adjusting the position of the pole piece in response to the judgment unit detecting that the battery cell alignment is unqualified, or the deflection correction unit is configured as a removal fixture for removing the battery cell in response to the judgment unit detecting that the battery cell alignment is unqualified.

5. The detection device according to any one of claims 1 to 3, characterized in that: The detection hole is configured in a triangular, circular or rectangular shape.

6. A method for detecting the alignment of cells of a laminated battery, characterized in that: The detection method can be performed by a detection device according to any one of claims 1 to 5, and the detection method comprises the following steps: S100: In the electrode material preparation stage, one or more detection holes are formed at least at the positive electrode sheet and the negative electrode sheet respectively; S200: judging whether the alignment of the battery cells is qualified based on the light received by the optical detection unit, wherein the light is emitted by the light source and passes through the detection hole accordingly; and S300: In response to determining that the alignment of the battery cells is unqualified, adjusting the battery cells.

7. The detection method according to claim 6, characterized in that: In step S200 , whether the alignment of the battery cells is qualified is determined 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.

8. The detection method according to claim 7, characterized in that: A plurality of detection holes are provided at the positive electrode sheet and / or the negative electrode sheet. In step S200, the alignment of the battery cells is judged to be acceptable based on position deviations of the plurality of detection holes relative to a preset theoretical boundary.

9. The detection method according to claim 7, characterized in that: The size of the detection hole and the theoretical size of the light spot are set based on the pole piece specification value, wherein the pole piece specification value is used to indicate the deviation value in size between the negative pole piece and the positive pole piece.

10. The detection method according to any one of claims 6 to 9, characterized in that: Steps S200 and S300 are performed during the electrode stacking process and in step S300 the electrode position is adjusted in response to detecting that the battery cell alignment is unqualified; or steps S200 and S300 are performed after the hot pressing process and in step S300 the battery cell is removed in response to detecting that the battery cell alignment is unqualified.

11. The detection method according to any one of claims 6 to 9, characterized in that: In step S100, the detection hole is formed into a triangle, a circle or a rectangle.

12. A cell manufacturing device for laminated batteries, characterized in that: The battery cell manufacturing device includes a material preparation unit for preparing pole pieces, a stacking unit for stacking pole pieces and separators, a hot pressing unit for hot pressing stacked battery cells, a conveying unit for transporting battery cells, and a battery cell alignment detection device according to any one of claims 1 to 5.

13. A method for manufacturing a battery cell for a laminated battery, characterized in that: The battery cell manufacturing method may be performed by the battery cell manufacturing device according to claim 12.

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