Stack detection indicator device, battery stack assembly equipment and battery stack assembly method

Abstract

The invention discloses a stacking detection indicating device, a battery stack assembly device and a battery stack assembly method, which include a base and a workbench. The base is provided with a stacking detection indicating device that acts on a workpiece. The stacking detection indicating device is configured with a plurality of contact detection units distributed in an array, each contact detection unit includes a positioning contact, and the detection points of all the positioning contacts are in the same plane; once the positioning contact is triggered by a single sheet and displaced, the signal triggering and indicating module will generate a specific trigger signal corresponding to the detection unit, and through intuitive indicating means, such as lighting up an indicator light at a specific position or presenting a specific mark on a display screen, to indicate the workpiece position corresponding to the triggered detection unit, and judge whether stacking offset occurs according to the workpiece position, and then correct the offset workpiece; under the action of the device of the present invention, the position error between the components and the overall shape and position error of the battery stack during the assembly process can be effectively guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel cell stack manufacturing, and more specifically, to a stack detection indicator device, a stack assembly device, and a stack assembly method. Background Art

[0002] The fuel cell stack is the place where electrochemical reactions occur and is the core part of the fuel cell system (or fuel cell engine). When the stack is working, hydrogen and oxygen are distributed to the bipolar plates of each single cell through the main gas channel of the stack, and are evenly distributed to the electrodes through the bipolar plate guide. The electrochemical reaction occurs through contact with the catalyst through the electrode support. The fuel cell stack is composed of multiple fuel cell cells stacked in series. The bipolar plates and membrane electrode MEAs are alternately stacked, and seals are embedded between each cell. After being pressed by the front and rear end plates, they are tightened with screws to form a fuel cell stack. Figure 9 shown.

[0003] Currently, the assembly of fuel cell stacks is divided into manual assembly and semi-automatic modes. Manual assembly is composed of workers manually obtaining and placing each component of the fuel cell stack: end plates, insulators, conductive plates, bipolar plates, sealed MEAs, bipolar plates, etc. (all referred to as workpieces in the text). Workers build the fuel cell stack in sequence (vertically) and then bind the single cells with metal compression bands; at a higher production level, the fuel cell stack assembly is semi-automatic, and the repeating units of about 380 battery cells are assembled by automatic fixtures.

[0004] Since a fuel cell stack consists of a large number of membrane electrode and bipolar plates (MEAs)—the specific number depends on the cell size, typically around three square meters—a large number of these plates is required. Stack materials include rigid components like the BPAs, as well as flexible components like the MEAs and seals. These components, along with their thickness, are all thin sheets on the order of millimeters. Therefore, whether assembled manually or semi-automatically, stacking these numerous BPAs and MEAs inevitably results in misalignment. To address this misalignment, existing methods typically design locating holes in all components, including the MEAs, BPAs, and seals. These holes are then used during the stacking process, with locating rods removed after assembly. This approach, however, increases the number of steps required to drill locating holes in each component. Furthermore, extracting the locating rods is inherently challenging given the large size of the stack. Therefore, specialized tooling equipment is essential to ensure that both component positional errors and overall stack geometry are minimized during assembly. Summary of the Invention

[0005] The purpose of the present invention is to provide a battery stack assembly auxiliary device, which has the advantage of being able to effectively ensure the position error between the components and the overall shape and position error of the battery stack during the assembly process.

[0006] The technical means adopted in the present invention are as follows:

[0007] A stack detection and indication device is configured with a plurality of contact detection units distributed in an array, each contact detection unit including a positioning contact, with detection points of all positioning contacts located in the same plane. The positioning contacts are connected to elastic reset elements, and the reset force provided by the elastic reset elements is less than the friction between adjacent pieces in the stack, so that when the positioning contacts reset after being triggered to move, the reset force is insufficient to cause the displacement of the individual workpieces. Each contact detection unit is also connected to a signal triggering and indication module. Once the positioning contact is triggered by a single piece and displaced, the signal triggering and indication module generates a specific trigger signal corresponding to the detection unit and indicates the workpiece position corresponding to the triggered detection unit.

[0008] Furthermore, the stacking detection indicating device is fixed on a three-dimensional adjustment mechanism, and the three-dimensional adjustment mechanism can drive the stacking detection indicating device to move in three directions: X, Y, and Z.

[0009] The present invention is further configured to include: a monitoring box, the monitoring box is fixed to the three-dimensional adjustment mechanism, the contact detection units distributed in an array on the stacking detection indicator are arranged on a side of the monitoring box close to the workbench and distributed along the length and width of the monitoring box; the positioning contact performs linear sliding motion in the monitoring box in a direction close to and away from the workbench;

[0010] The positioning contact is located in the monitoring box and is provided with a developing head at the end away from the workpiece. The side of the monitoring box close to the workbench is the front side, and the side opposite to the front side is the back side. The developing head can contact the back side of the monitoring box. The monitoring box is provided with a lighting device acting on the back side.

[0011] The battery stack assembly equipment also includes a CCD visual detection system located near the back of the monitoring box.

[0012] The present invention is further configured as follows: the monitoring box is made of a PC light guide plate;

[0013] The positioning contact is cylindrical and made of non-metal, and the developing head is a black pigment coated on the smaller diameter end of the positioning contact;

[0014] The lighting device is an LED lamp.

[0015] The present invention is further configured as follows: the diameter of the positioning contact is 1-2 mm, the spacing between each two positioning contacts is 0.5-1 mm, and the linear displacement of the positioning contact in the monitoring box is 1.5-4 cm;

[0016] The elastic reset element adopts a micro spring, and the elastic force is 0.05-0.2N.

[0017] The present invention is further configured as follows: a scale coordinate axis is provided on the front side of the monitoring box along the arrangement orientation of the positioning contacts, and a scale coordinate axis is also provided on the back side of the monitoring box accordingly.

[0018] A battery stack assembly device, comprising the above-mentioned stack detection indicator device, an intelligent robotic arm, a stack pressing device, a display, and a PLC system;

[0019] The intelligent robotic arm grasps the workpiece and places it on the workbench;

[0020] The stacking device includes a preliminary positioning mechanism for the stacked battery assembly and a central pressing platform for compacting the battery assembly;

[0021] The PLC system is respectively connected with the three-dimensional adjustment mechanism, CCD visual detection system, intelligent robotic arm, display, and stacking device circuit signals.

[0022] The present invention is further configured such that: the robotic arm grasps the workpiece by means of a suction cup, and the intelligent robotic arm places the workpiece on the workbench in sequence by means of a horizontal insertion.

[0023] The present invention is further configured such that the preliminary positioning mechanism includes four pressing plates, and the downward pressure of the pressing plates is controlled by telescopic cylinders respectively to simultaneously achieve pressing and positioning of the four corner end areas of the workpiece.

[0024] The present invention is further configured as follows: the central press platform is cross-shaped, and the four pressing plates are evenly distributed at the four notched corners of the cross-shaped central press platform, and the spacing between the pressing plates and the central press platform is 2-4 cm.

[0025] The present invention is further configured as follows: the workbench is provided with a limit rod acting on the end plate

[0026] The present invention further discloses a battery stack assembly method, which includes placing an end plate on a workbench and positioning it, and synchronously determining the specifications and dimensions of the workpieces and the dimensions of all the workpieces after stacking. According to the above-mentioned dimension information, the position of the stacking detection indicator device is adjusted so that the contact detection unit of the stacking detection indicator device covers the end faces to be measured after all the workpieces are stacked, and the contact detection unit is started. During the stacking process of each workpiece, the flatness of the stacked workpiece end faces to be measured is detected in real time, and all the contact detection units of the end faces to be measured of each workpiece are triggered to determine whether the end faces to be measured of the workpieces are skewed. If it is determined that deflection occurs, the stacking is stopped and the workpiece is adjusted manually or automatically, that is, adjusted to a state where all the contact detection units of the end faces to be measured of the workpiece are triggered, and then other workpieces are stacked until all the workpieces are stacked and compacted. After compaction, the other end plate is placed on top of the stacked group of workpieces, and then tightened by bolts to complete the assembly.

[0027] In summary, the present invention has the following beneficial effects:

[0028] 1. The present invention utilizes a small-diameter positioning contact to achieve completely accurate positioning of one side of the workpiece, and then utilizes PV light panel imaging combined with CCD imaging to capture the displacement state of one side of the workpiece. Under the action of the small-diameter positioning contact, any slight displacement of the side of the workpiece can be observed, thereby knowing whether the workpiece as a whole is skewed. The present invention only needs to capture the state of one side of the workpiece, that is, it can realize overall monitoring of the skew phenomenon during the stacking process of the workpiece. The monitoring method is simple and effective, thereby ensuring the position error and overall shape and position error between the components of the stack during the assembly process; and the punching process of workpieces such as membrane electrodes, bipolar plates, and sealing gaskets, as well as the screw positioning and removal processes, can be omitted, effectively saving manufacturing costs and improving manufacturing efficiency.

[0029] 2. The monitoring box of the present invention is provided with a scale coordinate axis, and combined with the presence of a small-diameter positioning contact, a coordinate imprint is accurately formed on the monitoring box. After determining the size of the side of the workpiece to be detected, the corresponding contact point of the workpiece on the monitoring box can be clearly identified. Therefore, when the workpiece is skewed, the corresponding undeveloped "contact point" can be accurately captured through CCD imaging. The coordinate axis of the "contact point" is then obtained and displayed on the monitor through program control of the PLC system, which makes it easy for staff to quickly know the skew change of a certain layer of workpieces, and effectively ensure the position error between components and the overall shape and position error of the stack during the assembly process;

[0030] 3. For the stacked battery assembly, the present invention first performs a synchronous small pressure limit on the four corner areas of the assembly, and then controls the withdrawal of the monitoring box from the workpiece. This process effectively avoids the possibility of slight displacement of the positioning contacts on the workpiece during the withdrawal of the monitoring box. In addition, during the compaction of the battery assembly, the four angle areas are always in a compacted state, which is conducive to the central pressing platform touching the central part of the battery assembly without causing skewness. Afterwards, the central pressing platform and the four pressing plates compact the battery assembly at the same time, that is, for a large area of ​​the battery assembly, the pressure is dispersed to the center + four corner areas. When the pressures from the five directions are equal, the stress concentration in multiple areas of the battery assembly is effectively improved, and the deformation of the battery assembly under pressure is effectively reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0032] Figure 1 This is a schematic diagram of the overall structure of the fuel cell assembly equipment;

[0033] Figure 2 Schematic diagram of the overall structure of the stack assembly equipment from another angle;

[0034] Figure 3 This is a schematic diagram of the overall external structure of the monitoring box in the fuel cell assembly equipment;

[0035] Figure 4 This is a schematic diagram of the partial internal structure of the monitoring box in the fuel cell assembly equipment;

[0036] Figure 5 This is a schematic diagram of the installation position of the lighting devices in the monitoring box of the battery stack assembly equipment;

[0037] Figure 6 This is a schematic diagram of the positions of the four pressing plates and the central pressing platform in the stack pressing device of the fuel cell stack assembly equipment;

[0038] Figure 7 This is a schematic diagram of the front of the monitoring box in the stack assembly equipment;

[0039] Figure 8 This is a schematic diagram of the back of the monitoring box in this stack assembly equipment, and also a diagram of the development state when the workpiece is skewed;

[0040] Figure 9 This is a diagram showing the relationship between the components of the fuel cell stack in the background technology of the specification.

[0041] In the figure: 1. Base; 2. Workbench; 3. Stacking detection indication device; 3-1. Monitoring box; 3-1-1. Positioning contact; 3-1-2. Elastic reset element; 3-1-3. Developing head; 3-1-4. Illuminating device; 3-2. Three-dimensional adjustment mechanism; 4. CCD visual inspection system; 5. Intelligent robotic arm; 6. Stacking device; 6-1. Preliminary positioning mechanism; 6-1-1. Pressing plate; 6-1-2. Telescopic cylinder; 6-2. Center pressing platform; 7. Display; 8. Workpiece; 9. Limit rod. DETAILED DESCRIPTION

[0042] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0043] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0044] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0045] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​described in these embodiments do not limit the scope of the present invention. At the same time, it should be clear that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The techniques, methods and equipment known to ordinary technicians in the relevant fields may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, so once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0046] In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention: the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0047] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below their position devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0048] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0049] Embodiment: A stack assembly device, such as Figure 1 As shown in FIG2 , the base 1 includes a stacking detection indicating device 3, an intelligent robotic arm 5, a stacking pressing device 6, a display 7, and a PLC system. The intelligent robotic arm 5, the stacking pressing device 6, and the display 7 are all connected to the PLC system circuit signal to facilitate the PLC system to process data and intelligently control the intelligent robotic arm 5, the stacking pressing device 6, the display 7, and other modules. A workbench 2 is provided on the base 1, and a stacking detection indicating device 3 is provided on the base 1 near the workbench 2 to act on the workpiece 8.

[0050] The above-mentioned stacking detection indicating device 3 is equipped with a plurality of contact detection units distributed in an array, each contact detection unit includes a positioning contact 3-1-1, and the detection points of all positioning contacts 3-1-1 are in the same plane; the positioning contact 3-1-1 is connected to the elastic reset element 3-1-2, and the reset elastic force provided by the elastic reset element 3-1-2 is smaller than the friction force between adjacent single pieces in the stacked workpiece 8, so that when the positioning contact 3-1-1 is reset after being triggered to move, its reset force is not enough to cause the single-piece workpiece 8 to move; each contact detection unit is also connected to the signal triggering and indicating module. Once the positioning contact 3-1-1 is triggered by a single sheet and displaced, the signal triggering and indicating module will generate a specific trigger signal corresponding to the detection unit and indicate the position of the workpiece 8 corresponding to the triggered detection unit; and the stacking detection indicating device is fixed on a three-dimensional adjustment mechanism 3-2, which can drive the stacking detection indicating device to move in the X, Y and Z directions.

[0051] The stacking detection indicating device 3 also includes a monitoring box 3-1, which is fixed to a three-dimensional adjustment mechanism 3-2. The three-dimensional adjustment mechanism 3-2 is assembled with common components such as slide rail assemblies, motors, and cylinders to drive the monitoring assembly to perform displacement movements in the X, Y, and Z directions near the workbench 2. The three-dimensional adjustment mechanism 3-2 is connected to the PLC system circuit, that is, the displacement of the monitoring assembly in the X, Y, and Z directions can be controlled by the PLC system.

[0052] like Figure 1-3 As shown, the monitoring box 3-1 is rectangular and is arranged perpendicular to the workbench 2. The length and width of the monitoring box 3-1 are customized according to actual needs, but in theory should not be less than the length / width of each workpiece 8 in the commonly used battery stack assembly in the existing field, as well as the overall height of the battery stack; the monitoring box 3-1 is made of a PC light guide plate, with the side of the monitoring box 3-1 facing the workbench 2 being set as the front, and the side opposite to the front being the back. More specifically, the front and back of the monitoring box 3-1 are both made of a PC light guide plate, and the rest is made of a plastic frame; as shown Figure 3As shown, further, along the length and width direction of the monitoring box 3-1, a plurality of positioning contacts 3-1-1 for resisting the workpiece 8 are evenly arranged in an array on the monitoring box 3-1. The positioning contacts 3-1-1 are cylindrical and made of non-metallic materials such as PP plastic. The diameter is 1-2 mm. In this embodiment, a positioning contact 3-1-1 with a diameter of 1.5 mm is used. The spacing between each two positioning contacts 3-1-1 is 0.5-1 mm, and in this embodiment, specifically 0.75 mm. The positioning contacts 3-1-1 can be extended to approach and move away from the workpiece 8 in the monitoring box 3-1. The positioning contact 3-1-1 makes a linear sliding motion in the direction of the working table 2, and during the sliding process, one end of the positioning contact 3-1-1 can penetrate the front of the monitoring box 3-1, and the linear displacement of the positioning contact 3-1-1 in the monitoring box 3-1 is 1.5-4 cm, and in this embodiment, specifically 3 mm; an elastic reset element (micro spring) 3-1-2 is also provided in the positioning contact 3-1-1 to realize the reset of the positioning contact 3-1-1 during the linear displacement process, and the elastic force of the elastic reset element (micro spring) 3-1-2 is 0.05-0.2N, and in this embodiment, specifically 0.1N, such as Figure 4 shown.

[0053] Furthermore, the positioning contact 3-1-1 is located in the monitoring box 3-1 and is provided with a developing head 3-1-3 at the end away from the workpiece 8. The developing head 3-1-3 is a black pigment coating applied to the smaller diameter end of the positioning contact 3-1-1. The developing head 3-1-3 can contact the back of the monitoring box 3-1. The monitoring box 3-1 is also provided with a lighting device 3-1-4, such as an LED lamp, which acts on the back of the monitoring box 3-1. Figure 4 and 5 In addition, in order to better realize the monitoring of the monitoring box 3-1, the front and back of the monitoring box 3-1 are provided with corresponding scale coordinate axes along the arrangement direction of the positioning contacts 3-1-1, such as Figure 6 Or 7. The stack assembly equipment also includes a CCD visual inspection system 4 located near the back of the monitoring box 3-1 and connected to the PLC system circuit signal. The CCG camera in the CCD visual inspection system 4 takes pictures of the back of the monitoring box 3-1 at a frequency of 10 seconds and feeds the picture data into the PLC system. The program data of the PLC system is processed to obtain the corresponding coordinate information and then displayed on the display screen, so that the staff can quickly read the displacement status of each layer of the workpiece 8.

[0054] like Figure 1 and 2As shown, the intelligent robotic arm 5 in the battery stack assembly equipment is arranged on a side close to the workbench 2 to grasp the workpiece 8 and place it on the workbench 2. The robotic arm grasps the workpiece 8 by suction through the suction cup mechanism thereon, and the intelligent robotic arm 5 places the workpiece 8 on the workbench 2 in sequence by horizontal insertion, rather than vertically placing it into the workbench 2, so as to avoid unnecessary conflict between the workpiece 8 and the positioning contact 3-1-1 on the monitoring box 3-1.

[0055] like Figure 1 As shown in or 2, the stacking device 6 in the stack assembly equipment includes a preliminary positioning mechanism 6-1 for the stack components after stacking, a central pressing platform 6-2 for compacting the stack components, and an electronic pressure gauge connected to the PLC system circuit signal, which can monitor and control the pressure of the central pressing platform 6-2 and the preliminary positioning mechanism 6-1; the preliminary positioning mechanism 6-1 includes four pressing plates 6-1-1, and the downward pressure of the pressing plates 6-1-1 is controlled by telescopic cylinders 6-1-2 on the pressing plates 6-1-1 to simultaneously achieve the pressing and positioning of the four corner end areas of the workpiece 8; the central pressing platform 6-2 is cross-shaped, and the four pressing plates 6-1-1 are evenly distributed at the four missing corners of the cross-shaped central pressing platform 6-2. The spacing between the pressing plates 6-1-1 and the central pressing platform 6-2 is 2-4 cm. In this embodiment, it is specifically 3 cm. Figure 1 、 2 and 6.

[0056] In addition, if Figure 2 As shown, the workbench 2 of the stack assembly equipment is also provided with a limiting rod 9 for the end plate, which is convenient for limiting the position of the end plate when it is placed on the workbench so that it is placed horizontally and positively on the workbench 2.

[0057] A battery stack assembly method, using the above-mentioned battery stack assembly equipment, placing the end plate on the workbench 2 and positioning it, synchronously determining the specifications and dimensions of the workpiece 8 and the dimensions of all the workpieces 8 after stacking, adjusting the position of the stacking detection indicator device 3 according to the above-mentioned dimension information so that the contact detection unit of the stacking detection indicator device 3 covers the end faces to be measured after all the workpieces 8 are stacked, starting the contact detection unit, and performing real-time stacking workpiece end face flatness detection on the end faces to be measured during the stacking of each workpiece 8, and judging whether the end faces to be measured of the workpiece 8 are skewed by triggering all the contact detection units of the end faces to be measured corresponding to each workpiece 8; if it is determined that deflection occurs, stop stacking and adjust the workpiece 8 manually or automatically, that is, adjust it until all the contact detection units of the end faces to be measured of the workpiece 8 are triggered, and then continue to stack other workpieces 8 until all the workpieces 8 are stacked, perform compaction processing, and after compaction, place the other end plate on top of the group of stacked workpieces 8, and then tighten with bolts to complete the assembly.

[0058] Specific implementation steps:

[0059] S1. Place the end plate on the workbench 2 and make one side of it contact with the limit rod 9. The end plate is placed horizontally on the workbench 2. Figure 2 As shown;

[0060] S2. Determine the size of the workpiece 8 and record and display it on the display 7 through the PLC system to determine the width of the workpiece 8 and the relationship between the number of positioning contacts within the corresponding coordinate scale range on the monitoring box;

[0061] S3, the three-dimensional adjustment mechanism 3-2 controls the monitor assembly close to the workbench 2, and the positioning contacts 3-1-1 in the bottom row of the monitoring box 3-1 are all located 1mm above the end plate;

[0062] S4, the intelligent robotic arm 5 grabs the workpieces 8 in sequence and places them horizontally on the workbench 2 in sequence;

[0063] S5. When the workpiece 8 is placed horizontally on the workbench 2, it contacts the positioning contact 3-1-1 on the monitoring box 3-1, causing the end of the positioning contact 3-1-1 containing the developing head 3-1-3 to contact the back of the monitoring box 3-1. At the same time, the LED light of the lighting device 3-1-4 is turned on, and the positioning contact 3-1-1 contacted by the workpiece 8 is displaced in the monitoring box 3-1, causing the end of the developing head 3-1-3 to contact the back of the monitoring box 3-1, thereby forming a black shadow on the back of the monitoring box 3-1.

[0064] S6, CCD visual inspection system 4 takes pictures of the back of monitoring box 3-1 at a frequency of 10s / time, transmits the data to the PLC system, and displays it on the display screen;

[0065] S7. When a workpiece 8 is skewed, the number of positioning contacts 3-1-1 corresponding to one side of the workpiece 8 is not displayed completely. The CCD visual inspection system 4 detects this phenomenon and transmits it to the PLC system. The PLC system obtains the coordinate axis of the developing head 3-1-3 that is not displayed on the monitoring box 3-1 based on the transmitted image, and finally displays the coordinate information of the developing head 3-1-3 on the display 7. After learning this, the staff quickly finds the workpiece 8 and makes manual adjustments, such as Figure 8 As shown, it represents (Y15 layer, X1-8 has missing development), that is, the workpiece 8 in the 15th layer is skewed;

[0066] S8. After stacking is completed, the preliminary positioning mechanism 6-1 of the stack pressing device 6 moves to the top of the stack assembly and simultaneously applies a pressure of 10N to the four corner areas of the stack assembly.

[0067] S9. Under the action of S8, the monitoring box 3-1 is driven by the three-dimensional adjustment mechanism 3-2 to move away from the battery stack workpiece 8 in the Y-axis direction;

[0068] S10: The pressing platform of the stacking device 6 compacts the stack assembly completed in S9. During this process, the four pressing plates 6-1-1 of the preliminary positioning mechanism 6-1 simultaneously compact the four corner end areas of the stack assembly with the same pressure as the central pressing platform 6-2.

[0069] S11. Finally, place the other end plate on top of the stack assembly and tighten it with bolts to complete the stack assembly.

[0070] 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 it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A stack detection indicator device, characterized in that: A plurality of contact detection units distributed in an array are configured, each contact detection unit includes a positioning contact (3-1-1), and the detection points of all positioning contacts (3-1-1) are in the same plane; the positioning contact (3-1-1) is connected to an elastic reset element (3-1-2), and the reset elastic force provided by the elastic reset element (3-1-2) is smaller than the friction force between adjacent single pieces in the stacked workpieces (8), so that when the positioning contact (3-1-1) resets after being triggered to move, its reset force is insufficient to cause the single piece of workpiece (8) to move; each contact detection unit is also connected to a signal trigger and indication module, and once the positioning contact (3-1-1) is triggered by a single piece to move, the signal trigger and indication module will generate a specific trigger signal corresponding to the detection unit and indicate the position of the workpiece (8) corresponding to the triggered detection unit; The stacking detection indicating device is fixed on a three-dimensional adjustment mechanism (3-2), and the three-dimensional adjustment mechanism can drive the stacking detection indicating device to move in the three directions of X, Y and Z.

2. A stacking detection indicating device according to claim 1, characterized in that: Also includes: A monitoring box (3-1) is fixed to the three-dimensional adjustment mechanism (3-2); contact detection units distributed in an array on the stacking detection indicator device (3) are arranged on a side of the monitoring box (3-1) close to the workbench (2) and are distributed along the length and width of the monitoring box (3-1); the positioning contact (3-1-1) performs linear sliding motion in the monitoring box (3-1) in the direction of approaching and moving away from the workbench (2); The positioning contact (3-1-1) is located in the monitoring box (3-1) and is provided with a developing head (3-1-3) at the end away from the workpiece (8). The side of the monitoring box (3-1) close to the workbench (2) is the front side, and the side opposite to the front side is the back side. The developing head (3-1-3) can contact the back side of the monitoring box (3-1). The monitoring box (3-1) is provided with a lighting device (3-1-4) that acts on the back side. The stack detection indicating device (3) further comprises a CCD visual detection system (4) located near the back of the monitoring box (3-1).

3. The stacking detection indicator device according to claim 2, wherein: The monitoring box (3-1) is made of a PC light guide plate; The positioning contact (3-1-1) is cylindrical and made of non-metal, and the developing head (3-1-3) is a black pigment coated on the smaller diameter end of the positioning contact (3-1-1); The lighting device (3-1-4) is an LED lamp.

4. The stacking detection indicator device according to claim 2, wherein: The front side of the monitoring box (3-1) is provided with a scale coordinate axis along the arrangement orientation of the positioning contacts (3-1-1), and the back side of the monitoring box (3-1) is also provided with a corresponding scale coordinate axis.

5. A stack assembly device, characterized in that: It comprises a stacking detection indicating device according to any one of claims 1 to 4, an intelligent robotic arm (5), a stacking device (6), a display (7), and a PLC system; The intelligent robotic arm (5) grasps the workpiece (8) and places it on the workbench (2); The stacking device (6) comprises a preliminary positioning mechanism (6-1) for the stacked battery assembly and a central pressing platform (6-2) for compacting the battery assembly. The PLC system is respectively connected to the circuit signals of the three-dimensional adjustment mechanism (3-2), the CCD visual detection system (4), the intelligent robotic arm (5), the display (7), and the stacking device (6).

6. The battery stack assembly equipment according to claim 5, characterized in that: The robotic arm grasps the workpiece (8) by means of a suction cup, and the intelligent robotic arm (5) sequentially places the workpiece (8) on the workbench (2) by means of a horizontal insertion.

7. The battery stack assembly equipment according to claim 5, characterized in that: The preliminary positioning mechanism (6-1) comprises four pressing plates (6-1-1), wherein the downward pressure of the pressing plates (6-1-1) is controlled by telescopic cylinders (6-1-2) respectively, so as to simultaneously achieve pressing and positioning of the four corner end regions of the workpiece (8).

8. The battery stack assembly equipment according to claim 5, characterized in that: The central pressing platform (6-2) is cross-shaped, and the four pressing plates (6-1-1) are evenly distributed at the four missing corners of the cross-shaped central pressing platform (6-2). The spacing between the pressing plates (6-1-1) and the central pressing platform (6-2) is 2-4 cm.

9. The fuel cell stack assembly equipment according to claim 5, characterized in that: The workbench (2) is provided with a limiting rod (9) that acts on the end plate.

10. A method for assembling a battery stack using the battery stack assembly device according to any one of claims 5 to 9, characterized in that: The end plate is placed on the workbench (2) and positioned, and the specification size of the workpiece (8) and the size of all the workpieces (8) after stacking are determined synchronously. According to the above size information, the position of the stacking detection indicator device is adjusted so that the contact detection unit of the stacking detection indicator device covers the end faces to be measured after all the workpieces (8) are stacked. The contact detection unit is started, and the flatness of the end faces to be measured is detected in real time during the stacking process of each workpiece (8). All contact detection units of the end faces to be measured corresponding to each workpiece (8) are triggered to judge whether the end faces to be measured of the workpiece (8) are skewed. If it is determined that the deflection occurs, the stacking is stopped and the workpiece (8) is adjusted manually or automatically, that is, adjusted until all the contact detection units of the end faces to be measured of the workpiece (8) are triggered. Then, other workpieces (8) are stacked until all the workpieces (8) are stacked and compacted. After compaction, another end plate is placed on top of the group of stacked workpieces (8), and then tightened by bolts to complete the assembly.

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