Battery cell size measurement system and method

Abstract

The present invention relates to the field of battery technology, and discloses a battery cell size measurement system and method, the system comprising: a carrier platform, a measuring mechanism and a controller, the measuring mechanism comprising a first laser device and a second laser device, the first laser device and the second laser device being arranged on the measuring mechanism in a manner of facing each other; the carrier platform, used for driving a battery cell to be measured to move relative to the measuring mechanism; the first laser device, used for emitting a first laser to the battery cell to be measured; the second laser device, used for emitting a second laser to the battery cell to be measured; the controller, used for collecting a first measurement value of the battery cell to be measured when it moves relative to the first laser device and a second measurement value of the battery cell to be measured when it moves relative to the second laser device, and calculating the battery cell size of the battery cell to be measured according to the first measurement value and the second measurement value, thereby avoiding the problem of scratches caused by direct contact with the battery cell, thereby improving the detection speed and detection cycle, and reducing the detection cost.

Description

Technical Field

[0001] The present invention relates to the field of battery technology, and in particular to a battery cell size measurement system and method. Background Art

[0002] In the lithium battery production process, it is necessary to measure and monitor the size of the battery cell online, such as the length, width, height and pole height of the battery cell. With the intensified competition in the manufacturing industry, the production end has higher and higher requirements for equipment, both in terms of equipment detection rhythm and manufacturing costs. Therefore, how to detect batteries with poor dimensions efficiently and at low cost to avoid assembly abnormalities after pulling is a very important point in the automatic detection of batteries.

[0003] At present, there are two main methods for measuring battery cell size: one is contact measurement, which has a low single-station cycle and is prone to scratches on the battery cells; the other is non-contact measurement using 2D cameras or 3D line lasers, which has a large amount of data and is very costly. Summary of the invention

[0004] In view of the above problems, the present invention provides a battery cell size measurement system and method, aiming to solve the problems that related battery cell size measurement methods are prone to scratches on the battery cells, have low detection cycle and high detection cost.

[0005] In a first aspect, the present invention provides a battery cell size measurement system, the battery cell size measurement system comprising: a carrier platform, a measurement mechanism and a controller, the measurement mechanism comprising a first laser device and a second laser device, the first laser device and the second laser device being arranged on the measurement mechanism in a manner of facing each other;

[0006] The carrier platform is used to drive the battery cell to be measured to move relative to the measuring mechanism;

[0007] The first laser device is used to emit a first laser to the battery cell to be measured when the battery cell to be measured moves to the measuring station corresponding to the measuring mechanism;

[0008] The second laser device is used to emit a second laser to the battery cell to be measured when the battery cell to be measured moves to the measuring station corresponding to the measuring mechanism;

[0009] The controller is used to collect a first measurement value of the battery cell to be measured when it moves relative to the first laser device and a second measurement value of the battery cell to be measured when it moves relative to the second laser device, and calculate the battery cell size of the battery cell to be measured based on the first measurement value and the second measurement value, wherein the first measurement value is used to represent the vertical distance from the first laser device to the surface of the battery cell to be measured, and the second measurement value is used to represent the vertical distance from the second laser device to the surface of the battery cell to be measured.

[0010] In the technical solution of the embodiment of the present invention, the size of the battery cell is measured by laser irradiation, thereby avoiding the problem of scratches caused by direct contact with the battery cell. The technical solution of the embodiment of the present invention measures the size of the battery cell in a walking beat manner, thereby improving the detection speed and detection cycle and reducing the detection cost.

[0011] In some embodiments, the first laser device includes a plurality of first lasers, and the second laser device includes a plurality of second lasers that are opposite to the plurality of first lasers;

[0012] The multiple first lasers are used to emit a first point laser to the battery cell to be measured when the battery cell to be measured moves to the measuring station corresponding to the measuring mechanism, and form multiple first scanning lines on the surface of the battery cell to be measured in a point-to-line manner to scan the battery cell to be measured through the relative movement of the first point laser and the battery cell to be measured;

[0013] The multiple second lasers are used to emit second point lasers to the battery cell to be measured when the battery cell to be measured moves to the measuring station corresponding to the measuring mechanism, and through the relative movement of the second point laser and the battery cell to be measured, multiple second scanning lines are formed on the surface of the battery cell to be measured in a point-to-line manner to scan the battery cell to be measured.

[0014] In the technical solution of the embodiment of the present invention, a point laser is emitted by a laser, and as the battery cell moves relative to the laser, the laser will continuously scan the battery cell to be measured in a point-to-line scanning manner, thereby enabling comprehensive measurement of the battery cell size.

[0015] In some embodiments, the controller is further used to obtain a first scanning frequency of the first laser, and to obtain a moving speed of the battery cell to be measured relative to the measuring mechanism;

[0016] The controller is further configured to calculate a first scanning point interval according to the first scanning frequency and the moving speed, and select a plurality of key points from the plurality of first scanning lines according to the first scanning point interval, wherein the key points include a scanning start point, a scanning midpoint, and a scanning end point;

[0017] The controller is further used to measure a first measurement value when the battery cell to be measured moves relative to the measuring mechanism according to the multiple key points.

[0018] In the technical solution of the embodiment of the present invention, multiple key points are selected from the scanning line to detect the size of the battery cell, so as to further improve the detection speed and detection cycle.

[0019] In some embodiments, the controller is further used to fit the multiple key points into a plane to obtain a fitting surface;

[0020] The controller is further used to calculate the flatness of the battery cell to be measured according to the vertical distance from each key point to the fitting surface.

[0021] In the technical solution of the embodiment of the present invention, multiple key points are fitted into a plane to obtain a fitting surface, and the flatness of the battery cell to be measured is calculated according to the vertical distance from each key point to the fitting surface, so that the flatness of the battery cell can be measured while measuring the size of the battery cell, thereby improving the flatness detection speed and detection rhythm.

[0022] In some embodiments, the carrier platform is also used to drive the standard block to move relative to the measuring mechanism;

[0023] The first laser device is further used to emit a first laser to the standard block when the standard block moves to the measuring station corresponding to the measuring mechanism;

[0024] The second laser device is further used to emit a second laser to the standard block when the standard block moves to the measuring station corresponding to the measuring mechanism;

[0025] The controller is further used to collect a first calibration value when the standard block moves relative to the measuring mechanism and a second calibration value when the standard block moves relative to the measuring mechanism, and calculate the cell size of the cell to be measured based on the first measurement value, the second measurement value, the first calibration value and the second calibration value, wherein the first calibration value is used to represent the vertical distance from the first laser device to the central cross-section of the standard block, and the second calibration value is used to represent the vertical distance from the second laser device to the central cross-section of the standard block.

[0026] In the technical solution of the embodiment of the present invention, before measuring the battery cell size, the first calibration value and the second calibration value of the battery cell size measurement system are obtained through a standard block, and the battery cell size of the battery cell to be measured is calculated according to the first measurement value, the second measurement value, the first calibration value and the second calibration value, thereby reducing the battery cell size measurement error and further improving the accuracy of battery cell size detection.

[0027] In some embodiments, the battery cell size measurement system further includes: a gripping unit corresponding to the measurement mechanism;

[0028] The gripping unit is used to clamp the battery cell to be measured when the battery cell to be measured moves to the measuring station corresponding to the measuring mechanism;

[0029] The first laser device is used to emit a first laser to the battery cell to be measured when the battery cell to be measured is clamped by the clamping unit;

[0030] The second laser device is used to emit a second laser to the battery cell to be measured when the battery cell to be measured is clamped by the clamping unit.

[0031] In the technical solution of the embodiment of the present invention, a gripping unit corresponding to the measuring mechanism can be provided at the measuring station corresponding to the measuring mechanism. When the battery cell to be measured moves to the measuring station corresponding to the measuring mechanism, the gripping unit clamps the battery cell to be measured, thereby enabling comprehensive measurement of the battery cell.

[0032] In some embodiments, the gripping unit is further used to obtain the measurement items of the measuring mechanism when the battery cell to be measured moves to the measuring station corresponding to the measuring mechanism, wherein the measurement items include at least one of height measurement, width measurement and length measurement;

[0033] The gripping unit is further used to select a gripped surface on the battery cell to be measured according to the measurement item, and clamp the gripped surface of the battery cell to be measured.

[0034] In the technical solution of the embodiment of the present invention, a gripped surface is selected on the battery cell to be measured according to the measurement items of the measuring mechanism, and the gripped surface of the battery cell to be measured is clamped, thereby improving the efficiency of measuring the battery cell size.

[0035] In some embodiments, the battery cell size measurement system further includes: a qualified discharge port and an unqualified discharge port;

[0036] The controller is further configured to send a non-conforming instruction to the carrier platform when the size of the battery cell does not meet the preset requirements;

[0037] The carrier platform is used to drive the battery cell to be measured to the unqualified discharge port for discharge when receiving the unqualified instruction;

[0038] The controller is further configured to send a qualified instruction to the carrier platform when the size of the battery cell meets a preset requirement;

[0039] The carrier platform is used to drive the battery cell to be measured to the qualified discharge port for discharge when receiving a qualified instruction.

[0040] In the technical solution of the embodiment of the present invention, when the size of the battery cell does not meet the preset requirements, the battery cell to be measured is driven by the carrier platform to the unqualified discharge port for discharge; when the size of the battery cell meets the preset requirements, the battery cell to be measured is driven by the carrier platform to the qualified discharge port for discharge, thereby enabling qualified and unqualified battery cells to be screened out in time.

[0041] In a second aspect, the present invention provides a method for measuring the size of a battery cell, comprising:

[0042] When the battery cell to be measured moves to the corresponding measuring station, emitting a first laser and a second laser to the battery cell to be measured, wherein the first laser and the second laser are opposite to each other;

[0043] Collecting a first measurement value when the battery cell to be measured moves relative to the measuring station and a second measurement value when the battery cell to be measured moves relative to the measuring station, wherein the first measurement value is used to represent the vertical distance from the laser device corresponding to the first laser to the surface of the battery cell to be measured, and the second measurement value is used to represent the vertical distance from the laser device corresponding to the second laser to the surface of the battery cell to be measured;

[0044] The cell size of the cell to be measured is calculated according to the first measurement value and the second measurement value.

[0045] In the technical solution of the embodiment of the present invention, the size of the battery cell is measured by laser irradiation, thereby avoiding the problem of scratches caused by direct contact with the battery cell. The technical solution of the embodiment of the present invention measures the size of the battery cell in a walking beat manner, thereby improving the detection speed and detection cycle and reducing the detection cost.

[0046] In some embodiments, when the battery cell to be measured moves to the corresponding measuring station, emitting the first laser and the second laser to the battery cell to be measured includes:

[0047] When the battery cell to be measured moves to the corresponding measuring station, a first point laser is emitted to the battery cell to be measured, and a plurality of first scanning lines are formed on the surface of the battery cell to be measured in a point-to-line manner through the relative movement of the first point laser and the battery cell to be measured to scan the battery cell to be measured;

[0048] When the battery cell to be measured moves to the corresponding measuring station, a second point laser is emitted to the battery cell to be measured. Through the relative movement of the second point laser and the battery cell to be measured, a plurality of second scanning lines are formed on the surface of the battery cell to be measured in a point-to-line manner to scan the battery cell to be measured.

[0049] In the technical solution of the embodiment of the present invention, by emitting a point laser, the battery cell moves relative to the point laser, and the battery cell to be measured is continuously scanned in a point-to-line scanning manner, thereby achieving comprehensive measurement of the battery cell size.

[0050] In some embodiments, collecting a first measurement value of the battery cell to be measured when it moves relative to the measuring station includes:

[0051] Acquire a first scanning frequency of the first point laser, and acquire a moving speed of the battery cell to be measured relative to the measuring station;

[0052] Calculating a first scanning point interval according to the first scanning frequency and the moving speed, and selecting a plurality of key points from the plurality of first scanning lines according to the first scanning point interval, wherein the key points include a scanning start point, a scanning midpoint, and a scanning end point;

[0053] A first measurement value of the battery cell to be measured when it moves relative to the measuring station is collected according to the multiple key points.

[0054] In the technical solution of the embodiment of the present invention, multiple key points are selected from the scanning line to detect the size of the battery cell, so as to further improve the detection speed and detection cycle.

[0055] In some embodiments, after calculating the first scanning point interval according to the first scanning frequency and the moving speed and selecting a plurality of key points from the plurality of first scanning lines according to the first scanning point interval, the method further comprises:

[0056] Fitting the multiple key points into a plane to obtain a fitting surface;

[0057] The flatness of the battery cell to be measured is calculated according to the vertical distance from each key point to the fitting surface.

[0058] In the technical solution of the embodiment of the present invention, multiple key points are fitted into a plane to obtain a fitting surface, and the flatness of the battery cell to be measured is calculated according to the vertical distance from each key point to the fitting surface, so that the flatness of the battery cell can be measured while measuring the size of the battery cell, thereby improving the flatness detection speed and detection rhythm.

[0059] In some embodiments, when the battery cell to be measured moves to the corresponding measuring station, before emitting the first laser and the second laser to the battery cell to be measured, the method further includes:

[0060] When the standard block moves to the corresponding measuring station, emitting a first laser and a second laser to the standard block;

[0061] Collecting a first calibration value when the standard block moves relative to the measuring station and a second calibration value when the standard block moves relative to the measuring station, wherein the first calibration value is used to represent the vertical distance from the laser device corresponding to the first laser to the central cross section of the standard block, and the second calibration value is used to represent the vertical distance from the laser device corresponding to the second laser to the central cross section of the standard block;

[0062] Correspondingly, calculating the cell size of the cell to be measured according to the first measurement value and the second measurement value includes:

[0063] The cell size of the cell to be measured is calculated according to the first measured value, the second measured value, the first calibrated value, and the second calibrated value.

[0064] In the technical solution of the embodiment of the present invention, before measuring the battery cell size, the first calibration value and the second calibration value of the battery cell size measurement system are obtained through a standard block, and the battery cell size of the battery cell to be measured is calculated according to the first measurement value, the second measurement value, the first calibration value and the second calibration value, thereby reducing the battery cell size measurement error and further improving the accuracy of battery cell size detection.

[0065] In some embodiments, when the battery cell to be measured moves to the corresponding measuring station, emitting the first laser and the second laser to the battery cell to be measured includes:

[0066] When the battery cell to be measured moves to the corresponding measuring station, clamping the battery cell to be measured;

[0067] When the battery cell to be measured is clamped, a first laser and a second laser are emitted to the battery cell to be measured.

[0068] In the technical solution of the embodiment of the present invention, when the battery cell to be measured moves to the corresponding measuring station, the battery cell to be measured is clamped, so that the battery cell can be fully measured.

[0069] In some embodiments, when the battery cell to be measured moves to the corresponding measuring station, clamping the battery cell to be measured includes:

[0070] When the battery cell to be measured moves to the corresponding measuring station, a current measurement item is obtained, wherein the current measurement item includes at least one of height measurement, width measurement and length measurement;

[0071] A gripped surface is selected on the battery cell to be measured according to the current measurement item, and the gripped surface of the battery cell to be measured is clamped.

[0072] In the technical solution of the embodiment of the present invention, a gripped surface is selected on the battery cell to be measured according to the current measurement item, and the gripped surface of the battery cell to be measured is clamped, thereby improving the efficiency of measuring the battery cell size.

[0073] In some embodiments, after calculating the cell size of the cell to be measured according to the first measurement value and the second measurement value, the method further includes:

[0074] When the size of the battery cell does not meet the preset requirements, the battery cell to be measured is driven to the unqualified discharge port for discharge;

[0075] When the size of the battery cell meets the preset requirements, the battery cell to be measured is driven to a qualified discharge port for discharge.

[0076] In the technical solution of the embodiment of the present invention, when the size of the battery cell does not meet the preset requirements, the battery cell to be measured is driven by a conveyor to the unqualified discharge port for discharge; when the size of the battery cell meets the preset requirements, the battery cell to be measured is driven by a conveyor to the qualified discharge port for discharge, thereby being able to screen out qualified and unqualified battery cells in time.

[0077] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0078] Figure 1 A structural diagram of a battery cell size measurement system according to some embodiments of the present invention;

[0079] Figure 2 It is a structural diagram of a measuring mechanism of some embodiments of the present invention;

[0080] Figure 3 It is a structural diagram of a measuring mechanism of some embodiments of the present invention;

[0081] Figure 4 It is a structural diagram of a measuring mechanism of some embodiments of the present invention;

[0082] Figure 5 A schematic diagram of a first laser measurement in some embodiments of the present invention;

[0083] Figure 6 Schematic diagrams of key points of some embodiments of the present invention;

[0084] Figure 7 It is a calibration schematic diagram of some embodiments of the present invention;

[0085] Figure 8 Schematic diagram of some embodiments of the present invention;

[0086] Fig. 9 A structural diagram of a battery cell size measurement system according to some embodiments of the present invention;

[0087] Fig.10 A flow chart of a method for measuring and correcting a battery cell size according to some embodiments of the present invention;

[0088] Fig.11 The present invention is a flowchart of a method for measuring and correcting battery cell dimensions according to some embodiments of the present invention.

[0089] The reference numerals in the specific implementation manner are as follows:

[0090] The carrier platform 10 , the height measuring mechanism 21 , the width measuring mechanism 22 , the length measuring mechanism 23 , the fixing mechanism 100 , the mechanism adjustment module 200 , the first laser 300 , the second laser 400 , the qualified material outlet 30 , and the unqualified material outlet 40 . DETAILED DESCRIPTION

[0091] The following embodiments of the technical solution of the present invention are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention.

[0092] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which the present invention belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention; the terms "including" and "having" in the specification and claims of the present invention and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0093] In the description of the embodiments of the present invention, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present invention, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0094] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0095] In the description of the embodiments of the present invention, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0096] In the description of the embodiments of the present invention, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0097] In the description of the embodiments of the present invention, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the embodiments of the present invention.

[0098] In the description of the embodiments of the present invention, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to the specific circumstances. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0099] At present, from the perspective of market development, the application of batteries is becoming more and more extensive. Batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of battery application areas, its market demand is also constantly expanding.

[0100] In the lithium battery production process, it is necessary to measure and monitor the size of the battery cell online, such as the length, width, height and pole height of the battery cell. With the intensified competition in the manufacturing industry, the production end has higher and higher requirements for equipment, both in terms of equipment detection rhythm and manufacturing costs. Therefore, how to detect batteries with poor dimensions efficiently and at low cost to avoid assembly abnormalities after pulling is a very important point in the automatic detection of batteries.

[0101] At present, there are two main methods for measuring battery cell size: one is contact measurement, which has a low single-station cycle and is prone to scratches on the battery cells; the other is non-contact measurement using 2D cameras or 3D line lasers, which has a large amount of data and is very costly.

[0102] In order to solve the problems that related battery cell size measurement methods are prone to scratches on battery cells, low detection cycle and high detection cost, the battery cell size can be measured by laser beaming, thereby avoiding scratches caused by direct contact with the battery cell. In addition, the present application measures the battery cell size in a walking beat manner, thereby improving the detection speed and detection cycle and reducing the detection cost.

[0103] In some embodiments, a battery cell size measurement system is proposed, the battery cell size measurement system comprising: a carrier platform, a measuring mechanism and a controller, the measuring mechanism comprising a first laser device and a second laser device, the first laser device and the second laser device being arranged on the measuring mechanism in a manner of facing each other; the carrier platform is used to drive the battery cell to be measured to move relative to the measuring mechanism; the first laser device is used to emit a first laser to the battery cell to be measured when the battery cell to be measured moves to a measuring station corresponding to the measuring mechanism; the second laser device is used to emit a second laser to the battery cell to be measured when the battery cell to be measured moves to a measuring station corresponding to the measuring mechanism; the controller is used to collect a first measurement value of the battery cell to be measured when it moves relative to the first laser device and a second measurement value when it moves relative to the second laser device, and calculate the battery cell size of the battery cell to be measured based on the first measurement value and the second measurement value, wherein the first measurement value is used to represent the vertical distance from the first laser device to the surface of the battery cell to be measured, and the second measurement value is used to represent the vertical distance from the second laser device to the surface of the battery cell to be measured.

[0104] In order to measure the size of the battery cell in a walking manner, improve the detection speed and detection rhythm, and reduce the detection cost, in this embodiment, the battery cell size measurement system includes: a carrier platform, a measuring mechanism and a controller. Among them, the carrier platform is used to drive the battery cell to be measured to move relative to the measuring mechanism. In a specific implementation, the carrier platform can be a conveyor belt or a tray that can move along a fixed track, etc., which is not limited in this embodiment. The measuring mechanism is used to measure the size information of the battery cell to be measured when it moves relative to the measuring mechanism. In a specific implementation, there can be multiple measuring mechanisms, and the multiple measuring mechanisms are used to measure different size information respectively. For example, the measuring mechanism includes a width measuring mechanism, a length measuring mechanism and a height measuring mechanism, wherein the width measuring mechanism is used to measure the width of the battery cell to be measured, the length measuring mechanism is used to measure the length of the battery cell to be measured, and the height measuring mechanism is used to measure the height of the battery cell to be measured.

[0105] For ease of understanding, refer to Figure 1 This invention is provided for illustration, but is not intended to limit the present application. Figure 1 is a structural diagram of a battery cell size measurement system in some embodiments of the present invention, Figure 1 In the embodiment, the cell size measurement system includes: a carrier platform 10, a measuring mechanism, a controller and a feed inlet, and the measuring mechanism includes: a height measuring mechanism 21, a width measuring mechanism 22 and a length measuring mechanism 23. After the cell to be measured is fed from the feed inlet, the carrier platform 10 drives the cell to be measured to move, triggering the height measuring mechanism 21, the width measuring mechanism 22 and the length measuring mechanism 23. The cell movement direction is as follows: Figure 1 As shown, the carrier platform 10 first drives the battery cell to be measured to the measuring station corresponding to the height measuring mechanism 21, measures the battery cell to be measured by the height measuring mechanism 21, and the controller calculates the battery cell height of the battery cell to be measured according to the measured value; the carrier platform 10 then drives the battery cell to be measured to the measuring station corresponding to the width measuring mechanism 22, measures the battery cell to be measured by the width measuring mechanism 22, and the controller calculates the battery cell width of the battery cell to be measured according to the measured value; the carrier platform 10 finally drives the battery cell to be measured to the measuring station corresponding to the length measuring mechanism 23, measures the battery cell to be measured by the length measuring mechanism 23, and the controller calculates the battery cell length of the battery cell to be measured according to the measured value.

[0106] In order to avoid scratches caused by direct contact with the battery cell, in this embodiment, the first laser device and the second laser device are arranged on the measuring mechanism in a manner of facing each other. The first laser device may include at least one first laser, and the second laser device may include at least one second laser.

[0107] For ease of understanding, refer to Figure 2 , Figure 3 as well as Figure 4This invention is provided for illustration, but is not intended to limit the present application. Figure 2 , Figure 3 as well as Figure 4 is a structural diagram of a measuring mechanism in some embodiments of the present invention, Figure 2 The middle measuring mechanism is the width measuring mechanism. Figure 3 The middle measuring mechanism is the length measuring mechanism. Figure 4 The middle measuring mechanism is the height measuring mechanism. The length, width and height of the battery cell to be measured are as follows: Figure 2 , Figure 3 as well as Figure 4 As shown, the measuring mechanism includes a fixing mechanism 100, a mechanism adjustment module 200, a first laser 300 and a second laser 400, wherein the fixing mechanism 100 is the basis of the entire measuring mechanism, and is used to stably support other components to ensure that the positions of each component remain stable during the measurement process. The mechanism adjustment module 200 is responsible for adjusting the positions of the first laser 300 and the second laser 400 to achieve mutual emission of the first laser 300 and the second laser 400. In a specific implementation, three first lasers 300 are evenly placed (or according to the required positions) on the upper, middle and lower sides of one side of the battery cell to be measured, and the same number of second lasers 400 are placed on the other side of the battery cell to be measured, and the positions of the first laser 300 and the second laser 400 are adjusted by the mechanism adjustment module 200 to achieve mutual emission of the first laser 300 and the second laser 400.

[0108] The cell size measurement step includes: when the cell to be measured moves to the measuring station corresponding to the measuring mechanism, the first laser 300 emits a first laser to the cell to be measured, and the second laser 400 emits a second laser to the cell to be measured. The controller first collects a first measurement value X1 of the battery cell to be measured when it moves relative to the first laser 300 and a second measurement value X2 of the battery cell to be measured when it moves relative to the second laser 400, then obtains the distance D between the first laser 300 and the first laser 400, and finally calculates the battery cell size of the battery cell to be measured according to the first measurement value, the second measurement value and the distance between the first laser 300 and the first laser 400. The specific formula is S=D-X1-X2, wherein S represents the battery cell size of the battery cell to be measured, which may be the length, width and height of the battery cell to be measured, D is the distance between the first laser 300 and the first laser 400, X1 is the first measurement value, and X2 is the second measurement value. The first measurement value is used to represent the vertical distance from the first laser 300 to the surface of the battery cell to be measured, and the second measurement value is used to represent the vertical distance from the second laser 400 to the surface of the battery cell to be measured.

[0109] This embodiment measures the size of the battery cell by laser beaming, thereby avoiding scratches caused by direct contact with the battery cell. In addition, the technical solution of the embodiment of the present invention measures the size of the battery cell by walking beat, thereby improving the detection speed and detection cycle and reducing the detection cost.

[0110] In some embodiments, the first laser device includes a plurality of first lasers, and the second laser device includes a plurality of second lasers that are opposite to the plurality of first lasers; the plurality of first lasers are used to emit a first point laser to the battery cell to be measured when the battery cell to be measured moves to the measuring station corresponding to the measuring mechanism, and to form a plurality of first scanning lines on the surface of the battery cell to be measured in a point-to-line manner through the relative movement of the first point laser and the battery cell to be measured to scan the battery cell to be measured; the plurality of second lasers are used to emit a second point laser to the battery cell to be measured when the battery cell to be measured moves to the measuring station corresponding to the measuring mechanism, and to form a plurality of second scanning lines on the surface of the battery cell to be measured in a point-to-line manner through the relative movement of the second point laser and the battery cell to be measured to scan the battery cell to be measured.

[0111] In order to comprehensively measure the size of the battery cell, in this embodiment, the laser can emit a point laser. When the battery cell moves relative to the laser, the laser will scan the battery cell to be measured in a point-to-line scanning manner. Figure 5 This invention is provided for illustration, but is not intended to limit the present application. Figure 5 is a schematic diagram of a first laser measurement in some embodiments of the present invention, Figure 5 In the embodiment, the carrier platform drives the battery cell to be measured to move at a constant speed relative to the measuring mechanism. At this time, the first laser and the second laser in the measuring mechanism are in a triggered on state. As the battery cell moves relative to the first laser, the first laser forms three first scanning lines on the surface of the battery cell in a point-to-line scanning manner. The first measurement value of the battery cell to be measured when it moves relative to the measuring mechanism is measured through the first scanning lines. In a specific implementation, for example, multiple scanning points are selected from the first scanning line to measure the first measurement value of the battery cell to be measured when it moves relative to the measuring mechanism. Figure 5The control unit may include a controller, a motion control system, a PLC (Programmable Logic Controller) and a host computer. The controller is used to control the first laser and the second laser, and upload the collected first measurement value and the second measurement value to the host computer. The motion control system is used to obtain the movement point of the battery cell through the PLC, and transmit the start point arrival signal and the end point arrival signal to the host computer. At this time, the start data and end point data obtained by the host computer are consistent with the start and end point arrival signal timing. The host computer is used to calculate the battery cell size of the battery cell to be measured based on the first measurement value and the second measurement value.

[0112] In this embodiment, a laser emits a point laser, and as the battery cell moves relative to the laser, the laser will continuously scan the battery cell to be measured in a point-to-line scanning manner, thereby being able to comprehensively measure the battery cell size.

[0113] In some embodiments, the controller is further used to obtain a first scanning frequency of the first laser and to obtain a moving speed of the battery cell to be measured relative to the measuring mechanism; the controller is further used to calculate a first scanning point interval based on the first scanning frequency and the moving speed, and to select a plurality of key points from the plurality of first scanning lines based on the first scanning point interval, wherein the key points include a scanning starting point, a scanning midpoint, and a scanning end point; the controller is further used to measure a first measurement value of the battery cell to be measured when it moves relative to the measuring mechanism based on the plurality of key points.

[0114] In order to further improve the detection speed and detection rhythm, in this embodiment, multiple key points are selected from the scan line to detect the cell size. Among them, the first measurement value includes the measurement values ​​of the scan start point, scan midpoint and scan end point, which are not limited in this embodiment. For ease of understanding, refer to Figure 6 This invention is provided for illustration, but is not intended to limit the present application. Figure 6 Schematic diagram of key points of some embodiments of the present invention, Figure 6 In the figure, the first laser is taken as an example. For each scanning line, the scanning frequency of the first laser is fixed, and the number of scanning points per second is n. The moving speed of the measured cell relative to the first laser is fixed, and the moving distance per second is s. The scanning point interval is Gap=s / (n-1). After the measurement values ​​of the scanning start point and the scanning end point are obtained through the preset trigger point, the measurement value of the scanning midpoint is obtained. It can be located by the relative distance s1 (s1 is the known position data) between the midpoint position and the starting point position. The (s1 / Gap) + 1 point after the scanning start point is the scanning midpoint. The measurement value of the scanning midpoint can be obtained by obtaining the measurement value of this position.

[0115] This embodiment selects multiple key points from the scan line to detect the size of the battery cell, thereby further improving the detection speed and detection cycle.

[0116] In some embodiments, the controller is further used to fit the multiple key points into a plane to obtain a fitting surface; the controller is further used to calculate the flatness of the battery cell to be measured based on the vertical distance from each key point to the fitting surface.

[0117] In order to measure the flatness of the battery cell while measuring the size of the battery cell, in this embodiment, multiple key points are fitted into a plane to obtain a fitting surface; the flatness of the battery cell to be measured is calculated according to the vertical distance from each key point to the fitting surface. Figure 6 This invention is provided for illustration, but is not intended to limit the present application. Figure 6 Schematic diagram of key points of some embodiments of the present invention, Figure 6 In the example of the first laser, 9 key points (or fewer key points) can be obtained. These 9 key points are fitted by the least square method to obtain a plane equation, which represents the fitting surface. Then for each key point, calculate its vertical distance to the fitting surface. Specifically, the coordinates of each key point are substituted into the plane equation, and the vertical distance formula from the key point to the plane is solved. The vertical distances from the key point to the fitting surface are S1, S2, S3, S4, S5, S6, S7, S8, and S9 respectively. Take the maximum value Smax and the minimum value Smin of these nine distance values, and Smax-Smin is the flatness.

[0118] This embodiment fits multiple key points into a plane to obtain a fitting surface, and calculates the flatness of the battery cell to be measured based on the vertical distance from each key point to the fitting surface, so that the flatness of the battery cell can be measured while measuring the battery cell size, thereby improving the flatness detection speed and detection rhythm.

[0119] In some embodiments, the carrier platform is also used to drive the standard block to move relative to the measuring mechanism; the first laser device is also used to emit a first laser to the standard block when the standard block moves to the measuring station corresponding to the measuring mechanism; the second laser device is also used to emit a second laser to the standard block when the standard block moves to the measuring station corresponding to the measuring mechanism; the controller is also used to collect a first calibration value of the standard block when it moves relative to the measuring mechanism and a second calibration value when it moves relative to the measuring mechanism, and calculate the cell size of the cell to be measured based on the first measurement value, the second measurement value, the first calibration value and the second calibration value, wherein the first calibration value is used to represent the vertical distance from the first laser device to the central cross-section of the standard block, and the second calibration value is used to represent the vertical distance from the second laser device to the central cross-section of the standard block.

[0120] In order to reduce the measurement error of the battery cell size, before measuring the battery cell size, this embodiment also obtains the first calibration value and the second calibration value of the battery cell size measurement system through the standard block, and calculates the battery cell size of the battery cell to be measured according to the first measurement value, the second measurement value, the first calibration value and the second calibration value. Figure 7 This invention is provided for illustration, but is not intended to limit the present application. Figure 7 is a calibration schematic diagram of some embodiments of the present invention, Figure 7 In the embodiment, the carrier platform is also used to drive the standard block to move relative to the measuring mechanism. When the standard block moves to the measuring station corresponding to the measuring mechanism, the first laser 300 emits the first laser to the standard block, and the second laser 400 emits the second laser to the standard block. The controller first collects the first calibration value Ln when the standard block moves relative to the measuring mechanism and the second calibration value L'n when the standard block moves relative to the measuring mechanism, and then calculates the cell size of the cell to be measured according to the first measurement value, the second measurement value, the first calibration value and the second calibration value by the formula S=(Ln-X1)+(L'n-X2), where S represents the cell size of the cell to be measured, which can be the length, width and height of the cell to be measured, Ln is the first calibration value, X1 is the first measurement value, L'n is the second calibration value, X2 is the second measurement value, the first calibration value is used to represent the vertical distance from the first laser 300 to the central cross section of the standard block, and the second calibration value is used to represent the vertical distance from the second laser 400 to the central cross section of the standard block.

[0121] Before measuring the battery cell size, the present embodiment also obtains the first calibration value and the second calibration value of the battery cell size measurement system through the standard block, and calculates the battery cell size of the battery cell to be measured according to the first measurement value, the second measurement value, the first calibration value and the second calibration value, thereby reducing the battery cell size measurement error and further improving the accuracy of battery cell size detection.

[0122] In some embodiments, the battery cell size measurement system also includes: the battery cell size measurement system also includes: a gripping unit corresponding to the measuring mechanism; the gripping unit is used to clamp the battery cell to be measured when the battery cell to be measured moves to the measuring station corresponding to the measuring mechanism; the first laser device is used to emit a first laser to the battery cell to be measured when the battery cell to be measured is clamped by the gripping unit; the second laser device is used to emit a second laser to the battery cell to be measured when the battery cell to be measured is clamped by the gripping unit.

[0123] Considering that the measuring mechanism cannot directly measure the size of the battery cell to be measured in some cases, in order to overcome the above-mentioned defects, in this embodiment, a gripping unit corresponding to the measuring mechanism can be provided at the measuring station corresponding to the measuring mechanism. When the battery cell to be measured moves to the measuring station corresponding to the measuring mechanism, the gripping unit clamps the battery cell to be measured.

[0124] In this embodiment, a gripping unit corresponding to the measuring mechanism may be provided at the measuring station corresponding to the measuring mechanism. When the battery cell to be measured moves to the measuring station corresponding to the measuring mechanism, the gripping unit clamps the battery cell to be measured, thereby enabling comprehensive measurement of the battery cell.

[0125] In some embodiments, the gripping unit is further used to obtain measurement items of the measuring mechanism when the battery cell to be measured moves to the measuring station corresponding to the measuring mechanism, wherein the measurement items include at least one of height measurement, width measurement and length measurement; the gripping unit is further used to select a gripped surface on the battery cell to be measured according to the measurement items, and clamp the gripped surface of the battery cell to be measured.

[0126] For ease of understanding, the following examples are given, but the present application is not limited. As an example, when the battery cell to be measured moves to the height measurement station corresponding to the height measurement mechanism, the measurement item is height measurement, then the mechanical clamp corresponding to the height measurement mechanism will clamp the surfaces on both sides of the length of the battery cell to be measured, exposing the surfaces on both sides of the height, and when the battery cell to be measured is clamped by the clamping unit, the height measurement mechanism measures the surfaces on both sides of the height to obtain the height measurement value; when the battery cell to be measured moves to the width measurement station corresponding to the height measurement mechanism, the battery cell to be measured is on the carrier platform, and the large surfaces on both sides of the width are exposed, and no mechanical clamp is required to assist, and the width measurement mechanism directly measures the large surfaces on both sides of the width to obtain the width measurement value; when the battery cell to be measured moves to the length measurement station corresponding to the length measurement mechanism, the measurement item is length measurement, then the mechanical clamp corresponding to the length measurement mechanism will clamp the large surfaces on both sides of the width of the battery cell to be measured, exposing the side surfaces on both sides of the length, and when the battery cell to be measured is clamped by the clamping unit, the height measurement mechanism measures the side surfaces on both sides of the length to obtain the length measurement value.

[0127] In this embodiment, a gripped surface is selected on the battery cell to be measured according to the measurement items of the measuring mechanism, and the gripped surface of the battery cell to be measured is clamped, thereby improving the efficiency of measuring the battery cell size.

[0128] In some embodiments, the battery cell size measurement system also includes: a qualified discharge port and an unqualified discharge port; the controller is further used to send an unqualified instruction to the carrier platform when the battery cell size does not meet the preset requirements; the carrier platform is used to drive the battery cell to be measured to the unqualified discharge port for discharge when receiving the unqualified instruction; the controller is further used to send a qualified instruction to the carrier platform when the battery cell size meets the preset requirements; the carrier platform is used to drive the battery cell to be measured to the qualified discharge port for discharge when receiving the qualified instruction.

[0129] In order to timely screen out qualified and unqualified cells, in this embodiment, when the cell size does not meet the preset requirements, the cell to be measured is driven by the carrier platform to the unqualified discharge port for discharge; when the cell size meets the preset requirements, the cell to be measured is driven by the carrier platform to the qualified discharge port for discharge. In the specific implementation, it is determined whether the cell size of the cell to be measured is greater than the preset first threshold value. If so, it is determined that the cell size does not meet the preset requirements; if not, it is determined that the cell size meets the preset requirements.

[0130] Of course, in this embodiment, the discharge of the battery cell to be measured can also be controlled in combination with the flatness. Figure 8 This invention is provided for illustration, but is not intended to limit the present application. Figure 8In the method, the size measurement of the battery cell includes: 1. When the battery cell to be measured moves to the measuring station corresponding to the measuring mechanism, the first laser is emitted to the battery cell to be measured by the first laser device, and the second laser is emitted to the battery cell to be measured by the second laser device; 2. The first measurement value of the battery cell to be measured when it moves relative to the first laser device and the second measurement value when it moves relative to the second laser device are collected, and the measurement values ​​of the scanning starting point, the scanning midpoint, and the scanning end point are extracted from the measurement values, and invalid data (detection data when the battery cell does not enter the detection station, or abnormal data caused by battery cell abnormality) are screened out, abnormal alarm is issued through the invalid data, and the carrier is used to detect the abnormality. The platform drives the battery cell to be measured corresponding to the invalid data to the unqualified discharge port for discharge; 3. Calculate the battery cell size and flatness; 4. When the battery cell size is greater than the preset first threshold or the flatness is greater than the preset second threshold, the carrier platform drives the battery cell to be measured to the unqualified discharge port for discharge; when the battery cell size is greater than the preset first threshold, or the flatness is greater than the preset second threshold, the carrier platform drives the battery cell to be measured to the unqualified discharge port for discharge; when the battery cell size is not greater than the preset first threshold, and the flatness is not greater than the preset second threshold, the carrier platform drives the battery cell to be measured to the qualified discharge port for discharge.

[0131] For ease of understanding, refer to Fig. 9 This invention is provided for illustration, but is not intended to limit the present application. Fig. 9 is a structural diagram of a battery cell size measurement system in some embodiments of the present invention, Fig. 9 In the embodiment, the battery cell size measurement system also includes: a qualified discharge port 30 and an unqualified discharge port 40; when the battery cell size is greater than a preset first threshold value, or the flatness is greater than a preset second threshold value, the battery cell to be measured is driven by the carrier platform 10 to the unqualified discharge port 40 for discharge; when the battery cell size is not greater than the preset first threshold value, and the flatness is not greater than the preset second threshold value, the battery cell to be measured is driven by the carrier platform 10 to the qualified discharge port 30 for discharge.

[0132] In this embodiment, when the size of the battery cell does not meet the preset requirements, the carrier platform drives the battery cell to be measured to the unqualified discharge port for discharge; when the size of the battery cell meets the preset requirements, the carrier platform drives the battery cell to be measured to the qualified discharge port for discharge, so that qualified and unqualified battery cells can be screened out in time.

[0133] In some embodiments, Fig.10 As shown, a method for measuring the size of a battery cell is proposed, comprising:

[0134] Step S10: When the battery cell to be measured moves to the corresponding measuring station, emitting a first laser and a second laser to the battery cell to be measured;

[0135] The first laser and the second laser are directed opposite to each other.

[0136] Step S20: collecting a first measurement value of the battery cell to be measured when it moves relative to the measuring station and a second measurement value of the battery cell to be measured when it moves relative to the measuring station;

[0137] The first measurement value is used to represent the vertical distance from the laser device corresponding to the first laser to the surface of the battery cell to be measured, and the second measurement value is used to represent the vertical distance from the laser device corresponding to the second laser to the surface of the battery cell to be measured.

[0138] Step S30: calculating the cell size of the cell to be measured according to the first measurement value and the second measurement value.

[0139] In this embodiment, the battery cell size measurement method can be applied to the battery cell size measurement system. In order to measure the battery cell size in a walking beat manner, improve the detection speed and detection beat, and reduce the detection cost, in this embodiment, the battery cell size measurement system includes: a carrier platform, a measuring mechanism and a controller. Among them, the carrier platform is used to drive the battery cell to be measured to move relative to the measuring mechanism. In a specific implementation, the carrier platform can be a conveyor belt or a tray that can move along a fixed track, etc., and this embodiment is not limited to this. The measuring mechanism is used to measure the size information of the battery cell to be measured when it moves relative to the measuring mechanism. In a specific implementation, the measuring mechanism can be multiple, and the multiple measuring mechanisms are used to measure different size information respectively. For example, the measuring mechanism includes a width measuring mechanism, a length measuring mechanism and a height measuring mechanism, wherein the width measuring mechanism is used to measure the width of the battery cell to be measured, the length measuring mechanism is used to measure the length of the battery cell to be measured, and the height measuring mechanism is used to measure the height of the battery cell to be measured.

[0140] For ease of understanding, refer to Figure 1 This invention is provided for illustration, but is not intended to limit the present application. Figure 1 is a structural diagram of a battery cell size measurement system in some embodiments of the present invention, Figure 1 In the embodiment, the cell size measurement system includes: a carrier platform 10, a measuring mechanism, a controller and a feed inlet, and the measuring mechanism includes: a height measuring mechanism 21, a width measuring mechanism 22 and a length measuring mechanism 23. After the cell to be measured is fed from the feed inlet, the carrier platform 10 drives the cell to be measured to move, triggering the height measuring mechanism 21, the width measuring mechanism 22 and the length measuring mechanism 23. The cell movement direction is as follows: Figure 1As shown, the carrier platform 10 first drives the battery cell to be measured to the measuring station corresponding to the height measuring mechanism 21, measures the battery cell to be measured by the height measuring mechanism 21, and the controller calculates the battery cell height of the battery cell to be measured according to the measured value; the carrier platform 10 then drives the battery cell to be measured to the measuring station corresponding to the width measuring mechanism 22, measures the battery cell to be measured by the width measuring mechanism 22, and the controller calculates the battery cell width of the battery cell to be measured according to the measured value; the carrier platform 10 finally drives the battery cell to be measured to the measuring station corresponding to the length measuring mechanism 23, measures the battery cell to be measured by the length measuring mechanism 23, and the controller calculates the battery cell length of the battery cell to be measured according to the measured value.

[0141] In order to avoid scratches caused by direct contact with the battery cell, in this embodiment, the first laser device and the second laser device are arranged on the measuring mechanism in a manner of facing each other. The first laser device may include at least one first laser, and the second laser device may include at least one second laser.

[0142] For ease of understanding, refer to Figure 2 , Figure 3 as well as Figure 4 This invention is provided for illustration, but is not intended to limit the present application. Figure 2 , Figure 3 as well as Figure 4 is a structural diagram of a measuring mechanism in some embodiments of the present invention, Figure 2 The middle measuring mechanism is the width measuring mechanism. Figure 3 The middle measuring mechanism is the length measuring mechanism. Figure 4 The middle measuring mechanism is the height measuring mechanism. The length, width and height of the battery cell to be measured are as follows: Figure 2 , Figure 3 as well as Figure 4 As shown, the measuring mechanism includes a fixing mechanism 100, a mechanism adjustment module 200, a first laser 300 and a second laser 400, wherein the fixing mechanism 100 is the basis of the entire measuring mechanism, and is used to stably support other components to ensure that the positions of each component remain stable during the measurement process. The mechanism adjustment module 200 is responsible for adjusting the positions of the first laser 300 and the second laser 400 to achieve mutual emission of the first laser 300 and the second laser 400. In a specific implementation, three first lasers 300 are evenly placed (or according to the required positions) on the upper, middle and lower sides of one side of the battery cell to be measured, and the same number of second lasers 400 are placed on the other side of the battery cell to be measured, and the positions of the first laser 300 and the second laser 400 are adjusted by the mechanism adjustment module 200 to achieve mutual emission of the first laser 300 and the second laser 400.

[0143] The battery cell size measurement step includes: when the battery cell to be measured moves to the measuring station corresponding to the measuring mechanism, the first laser 300 emits a first laser to the battery cell to be measured, and measures a first measurement value X1 of the battery cell to be measured relative to the measuring mechanism when the battery cell to be measured moves by the first laser, wherein the first measurement value is used to represent the vertical distance from the first laser device to the surface of the battery cell to be measured; the first laser 400 emits a second laser to the battery cell to be measured, and measures a second measurement value X2 of the battery cell to be measured relative to the measuring mechanism when the battery cell to be measured moves by the second laser, wherein the second measurement value is used to represent the vertical distance from the second laser device to the surface of the battery cell to be measured. The controller first obtains the distance D between the first laser 300 and the first laser 400, and then calculates the cell size of the battery cell to be measured according to the first measurement value, the second measurement value and the distance between the first laser 300 and the first laser 400. The specific formula is S=D-X1-X2, wherein S represents the cell size of the battery cell to be measured, which may be the length, width and height of the battery cell to be measured, D is the distance between the first laser 300 and the first laser 400, X1 is the first measurement value, and X2 is the second measurement value.

[0144] This embodiment measures the size of the battery cell by laser beaming, thereby avoiding scratches caused by direct contact with the battery cell. In addition, the technical solution of the embodiment of the present invention measures the size of the battery cell by walking beat, thereby improving the detection speed and detection cycle and reducing the detection cost.

[0145] In some embodiments, when the battery cell to be measured moves to a corresponding measuring station, emitting a first laser and a second laser to the battery cell to be measured, including: when the battery cell to be measured moves to the corresponding measuring station, emitting a first point laser to the battery cell to be measured, and through the relative movement of the first point laser and the battery cell to be measured, forming a plurality of first scanning lines on the surface of the battery cell to be measured in a point-to-line manner to scan the battery cell to be measured; when the battery cell to be measured moves to the corresponding measuring station, emitting a second point laser to the battery cell to be measured, and through the relative movement of the second point laser and the battery cell to be measured, forming a plurality of second scanning lines on the surface of the battery cell to be measured in a point-to-line manner to scan the battery cell to be measured.

[0146] In order to comprehensively measure the size of the battery cell, in this embodiment, the laser can emit a point laser. When the battery cell moves relative to the laser, the laser will scan the battery cell to be measured in a point-to-line scanning manner. Figure 5 This invention is provided for illustration, but is not intended to limit the present application. Figure 5 is a schematic diagram of a first laser measurement in some embodiments of the present invention, Figure 5In the embodiment, the carrier platform drives the battery cell to be measured to move at a constant speed relative to the measuring mechanism. At this time, the first laser and the second laser in the measuring mechanism are in a triggered on state. As the battery cell moves relative to the first laser, the first laser forms three first scanning lines on the surface of the battery cell in a point-to-line scanning manner. The first measurement value of the battery cell to be measured when it moves relative to the measuring mechanism is measured through the first scanning lines. In a specific implementation, for example, multiple scanning points are selected from the first scanning line to measure the first measurement value of the battery cell to be measured when it moves relative to the measuring mechanism. Figure 5 The controller may include a controller, a motion control system, a PLC (Programmable Logic Controller) and a host computer. The controller is used to control the first laser and the second laser, and upload the collected first measurement value and the second measurement value to the host computer. The motion control system is used to obtain the movement point of the battery cell through the PLC, and transmit the start point arrival signal and the end point arrival signal to the host computer. At this time, the start data and end point data obtained by the host computer are consistent with the start and end point arrival signal timing. The host computer is used to calculate the battery cell size of the battery cell to be measured based on the first measurement value and the second measurement value.

[0147] In this embodiment, a point laser is emitted, and the battery cell moves relative to the point laser, and the battery cell to be measured is continuously scanned in a point-to-line scanning manner, so that the comprehensiveness of the battery cell size measurement can be achieved.

[0148] In some embodiments, the collecting of the first measurement value of the battery cell to be measured when it moves relative to the measuring station includes: obtaining the first scanning frequency of the first point laser, and obtaining the moving speed of the battery cell to be measured relative to the measuring station; calculating the first scanning point interval according to the first scanning frequency and the moving speed, and selecting multiple key points from the multiple first scanning lines according to the first scanning point interval, wherein the key points include a scanning start point, a scanning midpoint, and a scanning end point; collecting the first measurement value of the battery cell to be measured when it moves relative to the measuring station according to the multiple key points.

[0149] In order to further improve the detection speed and detection rhythm, in this embodiment, multiple key points are selected from the scan line to detect the cell size. Among them, the first measurement value includes the measurement values ​​of the scan start point, scan midpoint and scan end point, which are not limited in this embodiment. For ease of understanding, refer to Figure 6 This invention is provided for illustration, but is not intended to limit the present application. Figure 6 Schematic diagram of key points of some embodiments of the present invention, Figure 6In the figure, the first laser is taken as an example. For each scanning line, the scanning frequency of the first laser is fixed, and the number of scanning points per second is n. The moving speed of the measured cell relative to the first laser is fixed, and the moving distance per second is s. The scanning point interval is Gap=s / (n-1). After the measurement values ​​of the scanning start point and the scanning end point are obtained through the preset trigger point, the measurement value of the scanning midpoint is obtained. It can be located by the relative distance s1 (s1 is the known position data) between the midpoint position and the starting point position. The (s1 / Gap) + 1 point after the scanning start point is the scanning midpoint. The measurement value of the scanning midpoint can be obtained by obtaining the measurement value of this position.

[0150] This embodiment selects multiple key points from the scan line to detect the size of the battery cell, thereby further improving the detection speed and detection cycle.

[0151] In some embodiments, after calculating the first scanning point interval according to the first scanning frequency and the moving speed and selecting multiple key points from the multiple first scanning lines according to the first scanning point interval, it also includes: fitting the multiple key points into a plane to obtain a fitting surface; and calculating the flatness of the battery cell to be measured according to the vertical distance from each key point to the fitting surface.

[0152] In order to measure the flatness of the battery cell while measuring the size of the battery cell, in this embodiment, multiple key points are fitted into a plane to obtain a fitting surface; the flatness of the battery cell to be measured is calculated according to the vertical distance from each key point to the fitting surface. Figure 6 This invention is provided for illustration, but is not intended to limit the present application. Figure 6 Schematic diagram of key points of some embodiments of the present invention, Figure 6 In the example of the first laser, 9 key points (or fewer key points) can be obtained. These 9 key points are fitted by the least square method to obtain a plane equation, which represents the fitting surface. Then for each key point, calculate its vertical distance to the fitting surface. Specifically, the coordinates of each key point are substituted into the plane equation, and the vertical distance formula from the key point to the plane is solved. The vertical distances from the key point to the fitting surface are S1, S2, S3, S4, S5, S6, S7, S8, and S9 respectively. Take the maximum value Smax and the minimum value Smin of these nine distance values, and Smax-Smin is the flatness.

[0153] This embodiment fits multiple key points into a plane to obtain a fitting surface, and calculates the flatness of the battery cell to be measured based on the vertical distance from each key point to the fitting surface, so that the flatness of the battery cell can be measured while measuring the battery cell size, thereby improving the flatness detection speed and detection rhythm.

[0154] In some embodiments, Fig.11 As shown, before step S10, the following steps are also included:

[0155] Step S01: When a standard block moves to a corresponding measuring station, a first laser and a second laser are emitted to the standard block.

[0156] Step S02: collecting a first calibration value when the standard block moves relative to the measuring station and a second calibration value when the standard block moves relative to the measuring station;

[0157] The first calibration value is used to represent the vertical distance from the laser device corresponding to the first laser to the central cross section of the standard block, and the second calibration value is used to represent the vertical distance from the laser device corresponding to the second laser to the central cross section of the standard block.

[0158] Accordingly, the step S30 includes:

[0159] Step S30': calculating the cell size of the cell to be measured according to the first measured value, the second measured value, the first calibrated value, and the second calibrated value.

[0160] In order to reduce the measurement error of the battery cell size, before measuring the battery cell size, this embodiment also obtains the first calibration value and the second calibration value of the battery cell size measurement system through the standard block, and calculates the battery cell size of the battery cell to be measured according to the first measurement value, the second measurement value, the first calibration value and the second calibration value. Figure 7 This invention is provided for illustration, but is not intended to limit the present application. Figure 7 is a schematic diagram of calibration of some embodiments of the present invention, Figure 7 In the embodiment, the carrier platform is also used to drive the standard block to move relative to the measuring mechanism. When the standard block moves to the measuring station corresponding to the measuring mechanism, the first laser 300 emits a first laser to the standard block, and measures the first calibration value Ln of the standard block when it moves relative to the measuring mechanism by the first laser. The first calibration value is used to represent the vertical distance from the first laser 300 to the central cross section of the standard block. Similarly, the second laser 400 emits a second laser to the standard block, and measures the second calibration value L'n of the standard block when it moves relative to the measuring mechanism by the second laser. The second calibration value is used to represent the vertical distance from the second laser 400 to the central cross section of the standard block. The controller calculates the cell size of the cell to be measured according to the first measurement value, the second measurement value, the first calibration value and the second calibration value by the formula S=(Ln-X1)+(L'n-X2). In the formula, S represents the cell size of the cell to be measured, which can be the length, width and height of the cell to be measured, Ln is the first calibration value, X1 is the first measurement value, L'n is the second calibration value, and X2 is the second measurement value.

[0161] Before measuring the battery cell size, the present embodiment also obtains the first calibration value and the second calibration value of the battery cell size measurement system through the standard block, and calculates the battery cell size of the battery cell to be measured according to the first measurement value, the second measurement value, the first calibration value and the second calibration value, thereby reducing the battery cell size measurement error and further improving the accuracy of battery cell size detection.

[0162] In some embodiments, the step S10 includes: clamping the battery cell to be measured when the battery cell to be measured moves to a corresponding measuring station; and emitting a first laser and a second laser to the battery cell to be measured when the battery cell to be measured is clamped.

[0163] Considering that the measuring mechanism cannot directly measure the size of the battery cell to be measured in some cases, in order to overcome the above-mentioned defects, in this embodiment, a gripping unit corresponding to the measuring mechanism can be provided at the measuring station corresponding to the measuring mechanism. When the battery cell to be measured moves to the measuring station corresponding to the measuring mechanism, the gripping unit clamps the battery cell to be measured.

[0164] In this embodiment, when the battery cell to be measured moves to the corresponding measuring station, the battery cell to be measured is clamped, so that the battery cell can be fully measured.

[0165] In some embodiments, when the battery cell to be measured moves to a corresponding measuring station, the battery cell to be measured is clamped, including: when the battery cell to be measured moves to a corresponding measuring station, obtaining a current measurement item, wherein the current measurement item includes at least one of height measurement, width measurement, and length measurement; selecting a grasped surface on the battery cell to be measured according to the current measurement item, and clamping the grasped surface of the battery cell to be measured.

[0166] For ease of understanding, the following examples are given, but the present application is not limited. As an example, when the battery cell to be measured moves to the height measurement station corresponding to the height measurement mechanism, the measurement item is height measurement, then the mechanical clamp corresponding to the height measurement mechanism will clamp the surfaces on both sides of the length of the battery cell to be measured, exposing the surfaces on both sides of the height, and when the battery cell to be measured is clamped by the clamping unit, the height measurement mechanism measures the surfaces on both sides of the height to obtain the height measurement value; when the battery cell to be measured moves to the width measurement station corresponding to the height measurement mechanism, the battery cell to be measured is on the carrier platform, and the large surfaces on both sides of the width are exposed, and no mechanical clamp is required to assist, and the width measurement mechanism directly measures the large surfaces on both sides of the width to obtain the width measurement value; when the battery cell to be measured moves to the length measurement station corresponding to the length measurement mechanism, the measurement item is length measurement, then the mechanical clamp corresponding to the length measurement mechanism will clamp the large surfaces on both sides of the width of the battery cell to be measured, exposing the side surfaces on both sides of the length, and when the battery cell to be measured is clamped by the clamping unit, the height measurement mechanism measures the side surfaces on both sides of the length to obtain the length measurement value.

[0167] In this embodiment, a gripped surface is selected on the battery cell to be measured according to the current measurement item, and the gripped surface of the battery cell to be measured is clamped, thereby improving the efficiency of measuring the battery cell size.

[0168] In some embodiments, after step S30, it also includes: when the size of the battery cell does not meet the preset requirements, driving the battery cell to be measured to an unqualified discharge port for discharge; when the size of the battery cell meets the preset requirements, driving the battery cell to be measured to a qualified discharge port for discharge.

[0169] In order to timely screen out qualified and unqualified cells, in this embodiment, when the cell size does not meet the preset requirements, the cell to be measured is driven by the carrier platform to the unqualified discharge port for discharge; when the cell size meets the preset requirements, the cell to be measured is driven by the carrier platform to the qualified discharge port for discharge. In the specific implementation, it is determined whether the cell size of the cell to be measured is greater than the preset first threshold value. If so, it is determined that the cell size does not meet the preset requirements; if not, it is determined that the cell size meets the preset requirements.

[0170] Of course, in this embodiment, the discharge of the battery cell to be measured can also be controlled in combination with the flatness. Figure 8 This invention is provided for illustration, but is not intended to limit the present application. Figure 8 In the method, the size measurement of the battery cell includes: 1. When the battery cell to be measured moves to the measuring station corresponding to the measuring mechanism, the first laser is emitted to the battery cell to be measured by the first laser device, and the second laser is emitted to the battery cell to be measured by the second laser device; 2. The first measurement value of the battery cell to be measured when it moves relative to the first laser device and the second measurement value when it moves relative to the second laser device are collected, and the measurement values ​​of the scanning starting point, the scanning midpoint, and the scanning end point are extracted from the measurement values, and invalid data (detection data when the battery cell does not enter the detection station, or abnormal data caused by battery cell abnormality) are screened out, abnormal alarm is issued through the invalid data, and the carrier is used to detect the abnormality. The platform drives the battery cell to be measured corresponding to the invalid data to the unqualified discharge port for discharge; 3. Calculate the battery cell size and flatness; 4. When the battery cell size is greater than the preset first threshold or the flatness is greater than the preset second threshold, the carrier platform drives the battery cell to be measured to the unqualified discharge port for discharge; when the battery cell size is greater than the preset first threshold, or the flatness is greater than the preset second threshold, the carrier platform drives the battery cell to be measured to the unqualified discharge port for discharge; when the battery cell size is not greater than the preset first threshold, and the flatness is not greater than the preset second threshold, the carrier platform drives the battery cell to be measured to the qualified discharge port for discharge.

[0171] For ease of understanding, refer to Fig. 9 This invention is provided for illustration, but is not intended to limit the present application. Fig. 9is a structural diagram of a battery cell size measurement system in some embodiments of the present invention, Fig. 9 In the process, when the size of the battery cell is larger than the preset first threshold value, or the flatness is larger than the preset second threshold value, the battery cell to be measured is driven by the carrier platform 10 to the unqualified discharge port 40 for discharge; when the size of the battery cell is not larger than the preset first threshold value, and the flatness is not larger than the preset second threshold value, the battery cell to be measured is driven by the carrier platform 10 to the qualified discharge port 30 for discharge.

[0172] In this embodiment, when the size of the battery cell does not meet the preset requirements, the battery cell to be measured is driven to the unqualified discharge port for discharge. When the size of the battery cell meets the preset requirements, the battery cell to be measured is driven to the qualified discharge port for discharge, thereby being able to screen out qualified and unqualified battery cells in time.

[0173] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell size measurement system, characterized in that: The battery cell size measurement system comprises: a carrier platform, a measuring mechanism and a controller, wherein the measuring mechanism comprises a first laser device and a second laser device, wherein the first laser device and the second laser device are arranged on the measuring mechanism in a manner of facing each other; The carrier platform is used to drive the battery cell to be measured to move relative to the measuring mechanism; The first laser device is used to emit a first laser to the battery cell to be measured when the battery cell to be measured moves to the measuring station corresponding to the measuring mechanism; The second laser device is used to emit a second laser to the battery cell to be measured when the battery cell to be measured moves to the measuring station corresponding to the measuring mechanism; The controller is used to collect a first measurement value when the battery cell to be measured moves relative to the first laser device and a second measurement value when the battery cell to be measured moves relative to the second laser device, and calculate the battery cell size of the battery cell to be measured according to the first measurement value and the second measurement value, wherein the first measurement value is used to represent the vertical distance from the first laser device to the surface of the battery cell to be measured, and the second measurement value is used to represent the vertical distance from the second laser device to the surface of the battery cell to be measured; Wherein, the first laser device includes a plurality of first lasers, and the second laser device includes a plurality of second lasers that are opposite to the plurality of first lasers; The multiple first lasers are used to emit a first point laser to the battery cell to be measured when the battery cell to be measured moves to the measuring station corresponding to the measuring mechanism, and form multiple first scanning lines on the surface of the battery cell to be measured in a point-to-line manner to scan the battery cell to be measured through the relative movement of the first point laser and the battery cell to be measured; The plurality of second lasers are used to emit second point lasers to the battery cell to be measured when the battery cell to be measured moves to the measuring station corresponding to the measuring mechanism, and form a plurality of second scanning lines on the surface of the battery cell to be measured in a point-to-line manner to scan the battery cell to be measured through the relative movement of the second point laser and the battery cell to be measured; Wherein, the carrier platform is also used to drive the standard block to move relative to the measuring mechanism; The first laser device is further used to emit a first laser to the standard block when the standard block moves to the measuring station corresponding to the measuring mechanism; The second laser device is further used to emit a second laser to the standard block when the standard block moves to the measuring station corresponding to the measuring mechanism; The controller is further used to collect a first calibration value when the standard block moves relative to the measuring mechanism and a second calibration value when the standard block moves relative to the measuring mechanism, and calculate the cell size of the cell to be measured based on the first measurement value, the second measurement value, the first calibration value and the second calibration value, wherein the first calibration value is used to represent the vertical distance from the first laser device to the central cross-section of the standard block, and the second calibration value is used to represent the vertical distance from the second laser device to the central cross-section of the standard block.

2. The battery cell size measurement system according to claim 1, characterized in that: The controller is further used to obtain a first scanning frequency of the first laser, and to obtain a moving speed of the battery cell to be measured relative to the measuring mechanism; The controller is further configured to calculate a first scanning point interval according to the first scanning frequency and the moving speed, and select a plurality of key points from the plurality of first scanning lines according to the first scanning point interval, wherein the key points include a scanning start point, a scanning midpoint, and a scanning end point; The controller is further used to measure a first measurement value when the battery cell to be measured moves relative to the measuring mechanism according to the multiple key points.

3. The battery cell size measurement system according to claim 2, characterized in that: The controller is further used to fit the multiple key points into a plane to obtain a fitting surface; The controller is further used to calculate the flatness of the battery cell to be measured according to the vertical distance from each key point to the fitting surface.

4. The battery cell size measurement system according to any one of claims 1 to 3, characterized in that: The battery cell size measurement system further includes: a gripping unit corresponding to the measurement mechanism; The gripping unit is used to clamp the battery cell to be measured when the battery cell to be measured moves to the measuring station corresponding to the measuring mechanism; The first laser device is used to emit a first laser to the battery cell to be measured when the battery cell to be measured is clamped by the clamping unit; The second laser device is used to emit a second laser to the battery cell to be measured when the battery cell to be measured is clamped by the clamping unit.

5. The battery cell size measurement system according to claim 4, characterized in that: The gripping unit is further used to obtain the measurement items of the measuring mechanism when the battery cell to be measured moves to the measuring station corresponding to the measuring mechanism, wherein the measurement items include at least one of height measurement, width measurement and length measurement; The gripping unit is further used to select a gripped surface on the battery cell to be measured according to the measurement item, and clamp the gripped surface of the battery cell to be measured.

6. The battery cell size measurement system according to any one of claims 1 to 3, characterized in that: The battery cell size measurement system also includes: a qualified discharge port and an unqualified discharge port; The controller is further configured to send a non-conforming instruction to the carrier platform when the size of the battery cell does not meet the preset requirements; The carrier platform is used to drive the battery cell to be measured to move to the unqualified discharge port for discharge when receiving an unqualified instruction; The controller is further configured to send a qualified instruction to the carrier platform when the size of the battery cell meets a preset requirement; The carrier platform is used to drive the battery cell to be measured to move to the qualified discharge port for discharge when receiving a qualified instruction.

7. A method for measuring the size of a battery cell, characterized in that: include: When the battery cell to be measured moves to the corresponding measuring station, emitting a first laser and a second laser to the battery cell to be measured, wherein the first laser and the second laser are opposite to each other; Collecting a first measurement value when the battery cell to be measured moves relative to the measuring station and a second measurement value when the battery cell to be measured moves relative to the measuring station, wherein the first measurement value is used to represent the vertical distance from the laser device corresponding to the first laser to the surface of the battery cell to be measured, and the second measurement value is used to represent the vertical distance from the laser device corresponding to the second laser to the surface of the battery cell to be measured; Calculating the cell size of the cell to be measured according to the first measurement value and the second measurement value; Wherein, when the battery cell to be measured moves to the corresponding measuring station, emitting the first laser and the second laser to the battery cell to be measured comprises: When the battery cell to be measured moves to the corresponding measuring station, a first point laser is emitted to the battery cell to be measured, and a plurality of first scanning lines are formed on the surface of the battery cell to be measured in a point-to-line manner through the relative movement of the first point laser and the battery cell to be measured to scan the battery cell to be measured; When the battery cell to be measured moves to the corresponding measuring station, a second point laser is emitted to the battery cell to be measured, and a plurality of second scanning lines are formed on the surface of the battery cell to be measured in a point-to-line manner through the relative movement of the second point laser and the battery cell to be measured to scan the battery cell to be measured; Wherein, when the cell to be measured moves to the corresponding measuring station, before emitting the first laser and the second laser to the cell to be measured, the method further includes: When the standard block moves to the corresponding measuring station, emitting a first laser and a second laser to the standard block; Collecting a first calibration value when the standard block moves relative to the measuring station and a second calibration value when the standard block moves relative to the measuring station, wherein the first calibration value is used to represent the vertical distance from the laser device corresponding to the first laser to the central cross section of the standard block, and the second calibration value is used to represent the vertical distance from the laser device corresponding to the second laser to the central cross section of the standard block; Correspondingly, calculating the cell size of the cell to be measured according to the first measurement value and the second measurement value includes: The cell size of the cell to be measured is calculated according to the first measured value, the second measured value, the first calibrated value, and the second calibrated value.

8. The method for measuring the size of a battery cell according to claim 7, characterized in that: The collecting of the first measurement value of the battery cell to be measured when it moves relative to the measuring station includes: Acquire a first scanning frequency of the first point laser, and acquire a moving speed of the battery cell to be measured relative to the measuring station; Calculating a first scanning point interval according to the first scanning frequency and the moving speed, and selecting a plurality of key points from the plurality of first scanning lines according to the first scanning point interval, wherein the key points include a scanning start point, a scanning midpoint, and a scanning end point; A first measurement value of the battery cell to be measured when it moves relative to the measuring station is collected according to the multiple key points.

9. The method for measuring the size of a battery cell according to claim 8, characterized in that: After calculating the first scanning point interval according to the first scanning frequency and the moving speed, and selecting a plurality of key points from the plurality of first scanning lines according to the first scanning point interval, the method further includes: Fitting the multiple key points into a plane to obtain a fitting surface; The flatness of the battery cell to be measured is calculated according to the vertical distance from each key point to the fitting surface.

10. The method for measuring the size of a battery cell according to any one of claims 7 to 9, characterized in that: When the battery cell to be measured moves to the corresponding measuring station, emitting the first laser and the second laser to the battery cell to be measured comprises: When the battery cell to be measured moves to the corresponding measuring station, clamping the battery cell to be measured; When the battery cell to be measured is clamped, a first laser and a second laser are emitted to the battery cell to be measured.

11. The method for measuring the size of a battery cell according to claim 10, characterized in that: When the battery cell to be measured moves to the corresponding measuring station, clamping the battery cell to be measured comprises: When the battery cell to be measured moves to the corresponding measuring station, a current measurement item is obtained, wherein the current measurement item includes at least one of height measurement, width measurement and length measurement; A gripped surface is selected on the battery cell to be measured according to the current measurement item, and the gripped surface of the battery cell to be measured is clamped.

12. The method for measuring the size of a battery cell according to any one of claims 7 to 9, characterized in that: After calculating the cell size of the cell to be measured according to the first measurement value and the second measurement value, the method further includes: When the size of the battery cell does not meet the preset requirements, the battery cell to be measured is driven to move to the unqualified discharge port for discharge; When the size of the battery cell meets the preset requirements, the battery cell to be measured is driven to move to the qualified discharge port for discharge.

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