Preparation Equipment and Preparation Method for a Secondary Battery

Abstract

Embodiments of the present invention relate to the field of new energy technologies, and disclose a preparation device and a preparation method for a secondary battery. In the present invention, the pressing plate of the hot melting device can cover the tab of the battery cell to ensure that the pressing plate can press the tab. At the same time, the detection device detects the gap between the insulating film and the battery top cover in real time and sends the detection result to the control device. If the detection result still does not meet the expectation, the control device can control the flipping device to re-place the insulating film until the detection result meets the standard, and then perform welding. In this way, when the battery cell specifications change or the tab protrusion affects the alignment accuracy of the insulating film, the preparation device for the secondary battery can automatically control the alignment accuracy of the insulating film, thereby improving the product yield and consistency. The preparation method for the secondary battery of the present invention is applied to the above-mentioned preparation device for the secondary battery.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of new energy, and particularly to a preparation device and a preparation method for secondary batteries. Background Art

[0002] In the battery production process, there is a process of thermally fusing and packaging the battery cell to install the battery cell into the insulating film, which can protect the internal circuit of the battery and provide a certain degree of insulation performance. In the existing battery cell insulating film packaging equipment, taking the packaging of the large surface of the battery cell as an example, usually a cylinder is used to move the clamping jaw to the thermal fusion station, and then the pressing device presses the battery cell and the insulating film before welding. Summary of the Invention

[0003] The purpose of the embodiments of the present invention is to provide a preparation device and a preparation method for secondary batteries, which can be compatible with the requirements of packaging insulating films for battery cells of different thicknesses and solve the problem of poor alignment effect of the insulating film caused by the protrusion of the battery cell tab.

[0004] To solve the above technical problems, the first aspect of the present invention provides a preparation device for secondary batteries, including:

[0005] A bracket; a thermal fusion device, including a hot pressing table fixed on the bracket, and a pressing mechanism and a thermal fusion mechanism oppositely arranged with the hot pressing table, the pressing mechanism includes a pressing plate, the thermal fusion mechanism includes a thermal fusion head arranged at an interval from the pressing plate, the orthographic projection of the part of the pressing plate close to the thermal fusion head on the hot pressing table can cover the orthographic projection of the part of the insulating film close to the thermal fusion head on the hot pressing table, and an avoidance groove for the thermal fusion head to pass through is arranged on the side wall of the pressing plate close to the thermal fusion head; the hot pressing table is used for carrying the battery cell, the pressing plate is used for pressing and fixing the insulating film on the surface of the battery cell, and the thermal fusion head is used for welding the insulating film and the battery top cover; a flipping device, oppositely arranged with the thermal fusion device and movably arranged on the bracket, the flipping device is used for clamping the insulating film and flipping the insulating film to the hot pressing table so that the insulating film covers the surface of the battery cell; a detection device, oppositely arranged with the flipping device and adjacent to the thermal fusion device, the detection device is used for detecting the gap between the insulating film on the battery cell and the battery top cover in real time after the flipping device flips the insulating film; a control device, electrically connected to the thermal fusion device, the flipping device and the detection device, the control device is used for sending operation commands to the thermal fusion device, the flipping device and the detection device, and receiving the detection information sent by the detection device.

[0006] The preparation equipment of the secondary battery according to the embodiment of the present invention uses a flipping device to flip the insulating film onto the battery cell on the hot pressing table. The pressing plate of the hot melting device can cover the tab of the battery cell. If the tab bulges and props up the insulating film, the pressing plate can press the tab to ensure that the gap between the insulating film and the battery top cover meets the preset requirements. At the same time, the detection device detects the gap between the insulating film and the battery top cover in real time and sends the detection result to the control device. If the detection result still does not meet the expectation, the control device can control the flipping device to re-place the insulating film until the detection result reaches the standard; if the detection result meets the requirements, the control device controls the hot melting mechanism to perform welding, and the detection device can also perform quality inspection on the welded products. In this way, when the battery cell specification changes or the alignment accuracy of the insulating film is affected by the tab bulge, the preparation equipment of the secondary battery can automatically control the alignment accuracy of the insulating film, thereby improving the product yield and consistency, enhancing the automated production level, and reducing the labor cost.

[0007] Optionally, the hot melting mechanism further includes a first support member, a hot melting driving member, and a hot melting head fixing member. The first support member is fixed to the bracket. There are multiple hot melting heads, and the multiple hot melting heads are fixedly arranged at intervals on the hot melting head fixing member. The hot melting driving member is fixed to the first support member or the hot melting head fixing member, and the hot melting driving member is used to drive the hot melting head fixing member to drive the multiple hot melting heads to move in the vertical direction; there are multiple avoidance grooves, and the avoidance grooves are arranged in one-to-one correspondence with the hot melting heads.

[0008] Optionally, the pressing mechanism includes a first mounting member and a pressing driving member. The first mounting member and the hot melting head fixing member are fixed on the same side of the first support member. The pressing plate is movably connected to the first mounting member and is located on the side of the hot melting head fixing member facing the hot pressing table. The pressing driving member is fixed to the first mounting member, and the pressing driving member is used to drive the pressing plate to press the insulating film or release the insulating film.

[0009] Optionally, the detection device is arranged adjacent to the first support member and is used to detect whether the distance between the edge of the flipped insulating film close to the battery top cover and the battery top cover is within the preset range. If it is within the preset range, the detection device sends the first detection information to the control device, and the control device controls the pressing mechanism to press the insulating film and controls the hot melting mechanism to weld the insulating film and the battery top cover; if it exceeds the preset range, the detection device sends the second detection information to the control device, and the control device controls the flipping device to clamp the insulating film again and adjust the position of the insulating film, and the detection device performs detection again.

[0010] Optionally, the flipping device includes a second support member, a cantilever driving member, two cantilevers, and two clamping mechanisms. The second support member is movably disposed on the bracket. The cantilever driving member is fixed to the second support member. The two cantilevers are arranged in parallel and are both movably disposed on the second support member. The two clamping mechanisms are oppositely arranged and are respectively fixed to the two cantilevers. The cantilever driving member is drivingly connected to the two cantilevers to drive the two cantilevers to drive the two clamping mechanisms to approach or separate from each other.

[0011] Optionally, the clamping mechanism includes a power assembly and a jaw drivingly connected to the power assembly. The power assembly is fixed to the cantilever. The power assembly is configured to drive the jaw to clamp or release the insulating film and to drive the jaw to flip the insulating film.

[0012] Optionally, the power assembly includes a rotary motor and a jaw driving member. The rotary motor is fixed to the cantilever. The jaw driving member is drivingly connected to the rotating shaft of the rotary motor. The jaw is drivingly connected to the jaw driving member. The rotary motor is configured to drive the jaw driving member to rotate. The jaw driving member is configured to drive the jaw to open and close and / or rotate.

[0013] Optionally, the jaw includes two oppositely arranged jaw arms. The two jaw arms have clamping ends for clamping the insulating film. Flexible clamping portions are provided at the two clamping ends. The two jaw arms clamp the insulating film through the flexible clamping portions.

[0014] Optionally, it further includes a transmission device fixed to the bracket. The transmission device includes a first driving mechanism disposed on the bracket and a second driving mechanism fixedly connected to the first driving mechanism. The second driving mechanism is fixedly connected to the flipping device. The first driving mechanism is configured to drive the second driving mechanism to drive the flipping device to move along a first direction. The second driving mechanism is configured to drive the flipping device to move along a second direction. The first direction is perpendicular to the second direction.

[0015] A second aspect of the present invention provides a method for manufacturing a secondary battery, including:

[0016] Flipping the insulating film so that the insulating film covers the surface of the battery cell;

[0017] Obtaining the actual distance between the edge of the insulating film close to the battery top cover and the battery top cover, and determining whether the actual distance is within a preset range;

[0018] If the actual distance is outside the preset range, re-place the insulating film and obtain the actual distance between the insulating film and the battery top cover again until the actual distance is within the preset range;

[0019] If the actual distance is within the preset range, press the insulating film and weld the insulating film and the battery top cover;

[0020] Perform an appearance inspection on the welding position to determine whether the appearance of the welding position meets the preset requirements;

[0021] If it does not meet the preset requirements, remove the insulating film and weld again until it meets the preset requirements;

[0022] If it meets the preset requirements, complete the processing and carry out blanking. Description of the Drawings

[0023] One or more embodiments are exemplarily illustrated by pictures in the corresponding drawings. These exemplary illustrations do not limit the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements. Unless otherwise stated, the drawings in the figures do not constitute a proportional limitation.

[0024] Figure 1 is a schematic perspective view of the preparation device for a secondary battery according to an embodiment of the present invention;

[0025] Figure 2 is a schematic perspective view of the hot melting device according to an embodiment of the present invention;

[0026] Figure 3 is Figure 2 a schematic side view of the hot melting device shown;

[0027] Figure 4 is Figure 2 an enlarged schematic view of area A1 in;

[0028] Figure 5 is a schematic perspective view of the flipping device according to an embodiment of the present invention;

[0029] Figure 6 is a schematic perspective view of the transmission device according to an embodiment of the present invention;

[0030] Figure 7 is a schematic flowchart of the preparation method for a secondary battery according to an embodiment of the present invention. Detailed Embodiments

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will elaborate on each embodiment of the present invention with reference to the drawings. However, those of ordinary skill in the art can understand that in each embodiment of the present invention, many technical details are provided to help readers better understand the present invention. However, even without these technical details and various changes and modifications based on the following embodiments, the technical solutions claimed by the present invention can still be achieved.

[0032] In the embodiments of the present invention, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present invention and its embodiments, and are not used to limit that the indicated device, element or component must have a specific orientation, or be constructed and operated in a specific orientation.

[0033] Moreover, in addition to being used to represent the orientation or positional relationship, some of the above terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the present invention can be understood according to specific circumstances.

[0034] In addition, the terms "mounted", "arranged", "provided with", "opened", "connected", "linked" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral structure; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, or there may be internal communication between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, the meaning of "a plurality" is two or more.

[0036] Currently, in the process of wrapping the battery cell with an insulating film, in order to ensure or improve the positioning accuracy of the insulating film, generally, a specific positioning fixture is designed to fix the battery cell to ensure the fixed position of the battery cell. However, due to different actual product requirements, the sizes of the battery cells that need to be wrapped with the insulating film are different, and corresponding fixtures need to be designed according to the changed battery cells. In other words, the versatility of the fixtures is low, which will increase the design cost and manufacturing cost of the fixtures, thus increasing the manufacturing cost of the battery cells. When the product specifications (such as the thickness and width of the battery) processed in the front and back batches are quite different, the actual distance between the insulating film and the battery top cover after being in place does not meet the requirements, resulting in poor welding effect. Moreover, due to processing errors and other reasons, the tabs of some batteries may protrude to a certain extent. The protruding tabs will support the insulating film, resulting in too large a distance between the insulating film and the battery top cover, which will also affect the welding effect and cause problems of low product yield and consistency. In addition, in the existing process, during the hot melting process, usually, manual judgment is used to determine whether the welding process meets the regulations. If the welding process and results do not meet the regulations, manual control is also carried out, and the automation level is relatively low.

[0037] To solve the above technical problems, an embodiment of the present invention provides a preparation device for a secondary battery, including: a bracket; a hot melting device, including a hot pressing table fixed on the bracket, and a pressing mechanism and a hot melting mechanism oppositely arranged with respect to the hot pressing table. The pressing mechanism includes a pressing plate, and the hot melting mechanism includes a hot melting head arranged at an interval with respect to the pressing plate. The orthographic projection of the part of the pressing plate close to the hot melting head on the hot pressing table can cover the orthographic projection of the part of the insulating film close to the hot melting head on the hot pressing table, and an avoidance groove for the hot melting head to pass through is provided on the side wall of the pressing plate close to the hot melting head; the hot pressing table is used to carry the battery cell, the pressing plate is used to press and fix the insulating film on the surface of the battery cell, and the hot melting head is used to weld the insulating film and the battery top cover; a flipping device, oppositely arranged with respect to the hot melting device and movably arranged on the bracket, the flipping device is used to clamp the insulating film and flip the insulating film to the hot pressing table so that the insulating film covers the surface of the battery cell; a detection device, oppositely arranged with respect to the flipping device and adjacent to the hot melting device, the detection device is used to detect the gap between the insulating film and the battery top cover on the hot pressing table in real time after the flipping device flips the insulating film; a control device, electrically connected to the hot melting device, the flipping device and the detection device, the control device is used to send operation commands to the hot melting device, the flipping device and the detection device, and receive the detection information sent by the detection device.

[0038] An embodiment of the present invention also provides a preparation method for a secondary battery, including:

[0039] Flip the insulating film so that the insulating film covers the surface of the battery cell;

[0040] Obtain the actual distance between the edge of the insulating film close to the battery top cover and the battery top cover, and determine whether the actual distance is within a preset range;

[0041] If the actual distance is outside the preset range, re-place the insulating film and obtain the actual distance between the insulating film and the battery top cover again until the actual distance is within the preset range;

[0042] If the actual distance is within the preset range, press the insulating film and weld the insulating film and the battery top cover;

[0043] Perform an appearance inspection on the welding position to determine whether the appearance of the welding position meets the preset requirements;

[0044] If it does not meet the preset requirements, remove the insulating film and re-weld until it meets the preset requirements;

[0045] If it meets the preset requirements, complete the processing and perform blanking.

[0046] The implementation details of the immersion liquid-cooled energy storage system according to the first embodiment of the present invention will be specifically described below. The following content is only the implementation details provided for convenient understanding and is not necessary for implementing this solution.

[0047] See Figures 1 to 7 , the preparation device 1000 of the secondary battery in this embodiment includes: a bracket 100, a hot melting device 200 fixed on the bracket 100, a flipping device 300 fixed on the bracket 100 and arranged opposite to the hot melting device 200, a detection device 400 arranged opposite to the flipping device 300 and adjacent to the hot melting device 200, and a control device (not shown in the figure) electrically connected to the hot melting device 200, the flipping device 300, and the detection device 400.

[0048] The hot-melt device 200 includes a hot-pressing table 210 fixed to the bracket 100, as well as a pressing mechanism 220 and a hot-melt mechanism 230 oppositely arranged with respect to the hot-pressing table 210. The hot-pressing table 210 is used to carry the battery cell 500. Among them, the pressing mechanism 220 includes a pressing plate 221 for pressing and fixing the insulating film 600 on the battery cell 500. The hot-melt mechanism 230 includes a hot-melt head 231 spaced apart from the pressing plate 221. The orthographic projection of the part of the pressing plate 221 close to the hot-melt head 231 on the hot-pressing table 210 can cover the orthographic projection of the part of the insulating film 600 close to the hot-melt head 231 on the hot-pressing table 210. In other words, the edge of the pressing plate 221 close to the hot-melt head 231 can cover the edge of the insulating film 600 close to the battery top cover 700, so as to ensure that when the pressing plate 221 presses the battery cell 500, it can press the tabs (not shown in the figure) of the battery cell 500. If the tabs are convex, the pressing plate 221 can flatten the tabs to ensure that the insulating film 600 flatly covers the surface of the battery cell 500. The pressing plate 221 is provided with an avoidance groove 221a on the side close to the hot-melt head 231. The hot-melt head 231 can pass through the avoidance groove 221a to contact the insulating film 600, so as to heat the insulating film 600 to make the insulating film 600 and the battery top cover 700 melt and connect.

[0049] The flipping device 300 is movably arranged on the bracket 100. The flipping device 300 can clamp the insulating film 600 and flip the insulating film 600 onto the hot-pressing table 210 so that the insulating film 600 covers the surface of the battery cell 500.

[0050] After the flipping device 300 flips the insulating film 600 onto the surface of the battery cell 500, the detection device 400 starts to detect the gap between the insulating film 600 and the battery top cover 700 on the battery cell 500 in real time, for example, detecting whether the size of the gap meets the preset range.

[0051] The control device can send operation instructions to the hot-melt device 200, the flipping device 300 and the detection device 400, so that each device performs hot melting according to the preset process. In addition, the control device can also receive the detection information sent by the detection device 400 to send corresponding control instructions to the hot-melt device 200, the flipping device 300 and the detection device 400 according to the detection information.

[0052] It can be understood that the detection information can be the specific size of the gap, and the control device evaluates whether the size of the gap meets the requirements and then performs control. Or, the detection device 400 can implement the functions of detection and evaluation, and the evaluation result is directly sent to the control device as the detection information, and the control device then performs control according to the evaluation result.

[0053] With such a setting, if the tab has a protrusion that props up the insulating film 600, the pressing plate 221 can press the tab to ensure that the gap between the insulating film 600 and the battery top cover 700 meets the preset requirements. At the same time, the detection device 400 detects the gap between the insulating film 600 and the battery top cover 700 in real time and sends the detection result to the control device. If the detection result still does not meet the expectation, the control device can control the flipping device 300 to re-place the insulating film 600 until the detection result reaches the standard; if the detection result meets the requirements, the control device controls the hot melting mechanism 230 to perform welding, and the detection device 400 can also perform quality inspection on the welded products. In this way, when the specifications of the battery cell 500 change or the alignment accuracy of the insulating film 600 is affected by the protrusion of the tab, the manufacturing equipment 1000 of the secondary battery can automatically control the alignment accuracy of the insulating film 600, thereby improving the yield and consistency of the product, enhancing the level of automated production, and reducing labor costs.

[0054] It can be understood that the control device in this embodiment can be a device such as a PLC host computer or a computer device that can achieve the expected control function, and the present invention does not make specific limitations thereto.

[0055] During the production process, the preset range of the gap between the insulating film 600 and the battery top cover 700 can be set to 0.5 mm - 2.5 mm. That is to say, after the flipping device 300 flips the insulating film 600 onto the surface of the battery cell 500, if the detection device 400 detects that the size of the gap between the insulating film 600 and the battery top cover 700 falls within the above range, the control device controls the pressing mechanism 220 to drive the pressing plate 221 to press and fix the battery cell 500 and the insulating film 600, and controls the hot melting mechanism 230 to drive the hot melting head 231 to move to the insulating film 600, and connects the insulating film 600 and the battery top cover 700 together by hot melting. If the detection device 400 detects that the size of the gap between the insulating film 600 and the battery top cover 700 falls outside the above range but the difference is small, the control device can control the pressing mechanism 220 to drive the pressing plate 221 to press and fix the battery cell 500 and the insulating film 600 to eliminate the influence of the enlarged gap caused by the protrusion of the tab (affected by factors such as manufacturing tolerances, and the protrusion degree is 1 mm - 2 mm).

[0056] In some embodiments, the hot melting device 200 further includes a film placement table 240 fixed on the bracket 100 and spaced from the hot pressing table 210. The film placement table 240 is used to carry the stacked insulating films 600. The flipping device 300 picks up the insulating film 600 on the film placement table 240 and then flips the picked-up insulating film 600 to cover the battery cell 500 on the hot pressing table 210.

[0057] Since the weight of the insulating film 600 itself is relatively small, the film placement table 240 can be designed as a groove, and the insulating film 600 is stacked in the groove to prevent the insulating film 600 from shifting or even falling off the film placement table 240. Notches can be provided on the side walls of the groove to facilitate the flipping device 300 to pick up the insulating film 600 from the groove.

[0058] In this embodiment, the hot melting mechanism 230 further includes a first support member 232, a hot melting driving member 233, and a hot melting head fixing member 234. The first support member 232 is fixed to the bracket 100 and is used to carry the hot melting driving member 233 and the hot melting head fixing member 234. Among them, there are multiple hot melting heads 231, and the multiple hot melting heads 231 are fixedly spaced on the hot melting head fixing member 234. The hot melting driving member 233 can be disposed on the first support member 232 or the hot melting head fixing member 234 to drive the hot melting head fixing member 234 to drive the multiple hot melting heads 231 to move in the vertical direction. More specifically, it can drive the multiple hot melting heads 231 to contact the insulating film 600 on the battery cell 500 to achieve hot melting connection, and after the hot melting connection is completed, it can also drive the multiple hot melting heads 231 away from the battery cell 500 to facilitate the continuous processing of other battery cells 500. It can be understood that when the hot melting heads 231 are provided in multiple numbers and are spaced apart from each other, the avoidance grooves 221a on the pressing plate 221 are also provided in multiple numbers and are spaced apart from each other, and the multiple hot melting heads 231 and the multiple avoidance grooves 221a are arranged in one-to-one correspondence.

[0059] It should be noted that a heating module of the electrical connection control device (not shown in the figure) is provided on the hot melting head fixing member 234, and the heating module can heat or stop heating the hot melting heads 231 under the control of the control device.

[0060] Optionally, the first support member 232 can be a first vertical slide rail, the hot melting head fixing member 234 is movably fixed on the first support member 232, the hot melting driving member 233 can be a motor, an electric cylinder or a cylinder of the electrical connection control device, its output end is fixed to one of the first support member 232 or the hot melting head fixing member 234, and its fixed end is fixed to the other of the first support member 232 or the hot melting head fixing member 234. When the hot melting driving member 233 works, it can drive the hot melting head fixing member 234 to move along the first support member 232.

[0061] In this embodiment, the pressing mechanism 220 further includes a first mounting member (not shown in the figure) and a pressing driving member (not shown in the figure). The first mounting member is fixed to the first support member 232 and is on the same side of the first support member 232 as the hot melting head fixing member 234. The pressing plate 221 is movably connected to the first mounting member and is on the side of the hot melting head fixing member 234 facing the hot pressing table 210. The pressing driving member is fixed to the first mounting member and is used to drive the pressing plate 221 to press the insulating film 600 or release the insulating film 600.

[0062] Optionally, the pressing driving member can be a motor, an electric cylinder or a pneumatic cylinder. Its fixed end is fixed to the first mounting member, and the output end is fixedly connected or drivingly connected to the pressing plate 221. The pressing driving member drives the pressing plate 221 to move in the vertical direction to press or release the insulating film 600.

[0063] In some embodiments, the pressing plate 221 and the hot melt head fixing member 234 can be arranged to move synchronously. At this time, the pressing driving member and the hot melt driving member 233 can be the same one. The pressing driving member is connected to the pressing plate 221 through the telescopic rod 222. For example, the telescopic rod 222 includes a first-stage rod 222a and a second-stage rod 222b. The first-stage rod 222a is fixedly connected to the hot melt head fixing member 234 and sleeved on the outer periphery of the second-stage rod 222b. The second-stage rod 222b can move up and down relative to the first-stage rod 222a. One end of the second-stage rod 222b close to the hot pressing table 210 is fixedly connected to the pressing plate 221. The hot melt head fixing member 234 can be provided with a through hole, and the first-stage rod 222a also has a through hole. The through hole of the hot melt head fixing member 234 is communicated with the through hole of the first-stage rod 222a. The output end of the pressing driving member is connected to the end of the second-stage rod 222b far from the hot pressing table 210 to drive the second-stage rod 222b to move relative to the first-stage rod 222a and drive the pressing plate 221 to move. In still some other embodiments, the pressing driving member can be connected to the pressing plate 221 through a fixed rod (not shown in the figure). At this time, the fixed rod is not telescopic.

[0064] Alternatively, a spring 223 can be sleeved on the outer periphery of the second-stage rod 222b. The spring 223 is located between the pressing plate 221 and the hot melt head fixing member 234. The two ends of the spring 223 respectively abut against the pressing plate 221 and the hot melt head fixing member 234. The pressing driving member and the hot melt driving member 233 are the same one, which is only used to drive the hot melt head fixing member 234 to move. The pressing plate 221 presses the insulating film 600 by the elastic force of the spring 223.

[0065] It can be understood that the telescopic rod 222 or the fixed rod can be arranged in two and are arranged in parallel. And, two through holes for the telescopic rod 222 or the fixed rod to pass through can be provided on the hot melt head fixing member 234, and the telescopic rod 222 or the fixed rod is used as a guide rod for the up and down movement of the hot melt head fixing member 234.

[0066] In this embodiment, the detection device 400 is arranged adjacent to the hot melt device 200, specifically, adjacent to the first support member 232. After the flipping device 300 flips the insulating film 600 onto the battery cell 500, the detection device 400 begins to detect in real time whether the distance between the edge of the insulating film 600 close to the battery top cover 700 and the battery top cover 700 is within a preset range. When the detection result shows that the aforementioned distance is within the preset range, the control device can control the pressing mechanism 220 to press the insulating film 600 and the battery cell 500 according to the detection result of the detection device 400 (information indicating compliance with the requirements), and control the hot melt mechanism 230 to perform hot melt connection on the insulating film 600 and the battery top cover 700. When the test result shows that the aforementioned distance exceeds the preset range, the control device can be configured to control the flipping device 300 to re-clamp, flip and place the insulating film 600 according to the test result (information indicating non-compliance with the requirements) until the test result meets the requirements; or, when the test result shows that the aforementioned distance exceeds the preset range, the control device can be configured to control the clamping mechanism 220 to clamp the insulating film 600 and the battery cell 500 according to the test result to eliminate the influence caused by the protrusion of the pole ear, and then detect whether the aforementioned distance meets the requirements. If so, hot melt connection is performed. If not, the flipping device 300 is controlled to re-place the insulating film 600 and test it until the processing requirements are met.

[0067] In this embodiment, the detection device 400 is a camera, which can be a CCD camera or an AI camera. When the AI ​​camera is used, it can calculate the actual distance between the edge of the insulating film 600 close to the battery top cover 700 and the battery top cover 700 based on the shooting results. If the camera is a CCD camera, the control device can obtain the image captured by the CCD camera, and calculate based on the image to obtain the actual distance between the edge of the insulating film 600 close to the battery top cover 700 and the battery top cover 700.

[0068] It is understandable that the detection device 400 can also be configured to detect the appearance of the battery cell 500 after the hot melt connection is completed to determine whether the welding of the insulating film 600 meets the standards.

[0069] In this embodiment, the flipping device 300 includes a second support member 310, a cantilever driving member 320, two cantilevers 330 and two clamping mechanisms 340. The second support member 310 is movably arranged on the bracket 100, the cantilever driving member 320 is fixed to the second support member 310, the two cantilevers 330 are arranged in parallel and movably arranged on the second support member 310, and the two clamping mechanisms 340 are arranged oppositely and fixed to the two cantilevers 330 in a one-to-one correspondence. Among them, the cantilever driving member 320 is connected to the two cantilevers to drive the two cantilevers 330 to drive the two clamping mechanisms 340 to move closer to or away from each other, and the two clamping mechanisms 340 are used to clamp the insulating film 600 or release the insulating film 600.

[0070] Specifically, the second support member 310 is arranged opposite to the first support member 232, and can be driven to approach the first support member 232 or to move away from the first support member 232. The second support member 310 is used to carry the cantilever driving member 320, two cantilevers 330 and two clamping mechanisms 340. The cantilever driving member 320 is fixed on the second support member 310. The two cantilevers 330 can move closer to or farther from each other in the horizontal direction under the drive of the cantilever driving member 320. When it is necessary to clamp the insulating film 600, the cantilever driving member 320 drives the two cantilevers 330 to move away from each other, thereby moving the two clamping mechanisms 340 away from each other. After the two clamping mechanisms 340 move to the opposite sides of the insulating film 600, the cantilever driving member 320 drives the two cantilevers 330 to drive the two clamping mechanisms 340 to move closer to each other. After the two clamping mechanisms 340 clamp the insulating film 600, the two clamping mechanisms 340 can flip the insulating film 600.

[0071] The two cantilevers 330 extend from the second support member 310 toward the hot melt mechanism 230. The two cantilevers 330 are respectively provided with a clamping mechanism 340 at one end close to the hot melt mechanism 230. The two clamping mechanisms 340 are located between the two cantilevers 330 and can rotate relative to the cantilevers 330. In this way, the insulating film 600 can be turned over after being clamped.

[0072] Optionally, the cantilever drive member 320 can be set as a motor or an electric cylinder. When a motor is used, the two cantilevers 330 can be driven to move closer to or farther from each other through a gear transmission mechanism or a screw slider transmission mechanism. When a motor or an electric cylinder is used as the cantilever drive member 320, when the clamping plate 221 presses the battery cell 500 and the insulating film 600 and the hot melt head 231 performs hot melt connection, the retraction function of the motor or the electric cylinder can be used to make the clamping mechanism 340 clamp the edges of the opposite sides of the insulating film 600 respectively, and then the two cantilevers 330 are driven by the motor or the electric cylinder to drive the two clamping mechanisms 340 away from each other, so as to flatten and tighten the insulating film 600.

[0073] In this embodiment, the clamping mechanism 340 includes a power component 341 and a clamp (not shown) that is transmission-connected to the power component. The power component 341 is fixed to the cantilever 330. The power component 341 is used to drive the clamp to clamp the insulating film 600 or release the insulating film 600, and drive the clamp to flip the insulating film 600.

[0074] For example, the power assembly 341 includes a rotary motor 341a and a clamping jaw driving member 341b. The rotary motor 341a is fixed to one end of the cantilever 330 close to the first support member 232, and can be located on the side of one cantilever 330 away from the other cantilever 330. The clamping jaw driving member 341b is connected to the rotating shaft of the rotary motor 341a, and can be driven by the rotary motor 341a to rotate the clamping jaw driving member 341b. The clamping jaw driving member 341b is used to drive the clamping jaw to open and close and / or rotate to flip the insulating film 600 clamped and fixed by the clamping jaw. It can be understood that the power assembly 341 can be a rotating clamping jaw. Compared with the rotating mechanism formed by discrete components, the rotating clamping jaw has a high degree of integration and a small volume, and can be directly installed and used, which can reduce the process and time of assembling the equipment.

[0075] In some embodiments, the clamping mechanism can also be formed by assembling discrete components, for example, the clamping jaw driving member 341b is a cylinder or an electric cylinder, which is fixed to the fixed plate, the output end of the rotating motor 341a is connected to the clamping jaw driving member 341b or the fixed plate, and the clamping jaw is connected to the clamping jaw driving member 341b. For example, the clamping jaw is movably arranged on the fixed plate, and the output end of the clamping jaw driving member 341b is fixedly connected to the clamping jaw, the clamping jaw driving member 341b drives the clamping jaw to clamp the insulating film 600 or release the insulating film 600, and the rotating motor 341a drives the clamping jaw to rotate by rotating the fixed plate or the clamping jaw driving member 341b.

[0076] Furthermore, the clamp includes two clamp arms arranged opposite to each other, the two clamp arms have clamp ends for clamping the insulating film 600, the two clamp ends are provided with flexible clamp parts (not shown), and the two clamp arms clamp the insulating film 600 through the flexible clamp parts. By providing the flexible clamp parts on the clamp ends of the clamp arms, the insulating film 600 can be directly clamped by the clamp arms with greater hardness, thereby preventing the insulating film 600 from wrinkling. At the same time, since the flexible clamp part has a certain deformation margin, during the clamping process, the clamp driving member 341b outputs a force that causes the flexible clamp part to deform to a certain extent, which can ensure the stability of the clamped insulating film 600 and prevent the two clamp arms from excessively squeezing each other during clamping and damaging the device.

[0077] Optionally, the clamp driving member 341b may be a motor, an electric cylinder or a pneumatic cylinder, and the flexible clamping portion may be made of flexible materials such as rubber and silicone, which is not specifically limited in the present invention.

[0078] In some other embodiments, to ensure that each picked insulating film 600 is a single sheet, the method of picking up the insulating film 600 using a suction cup can be used to replace the method of clamping with a jaw. For example, the fixed end of a pneumatic slip ring (not shown in the figure) is fixed on the fixed plate. The rotating end of the pneumatic slip ring is located on the side away from the fixed plate of the fixed end and faces the other cantilever. A suction cup (not shown in the figure) is provided at the rotating end of the pneumatic slip ring. The suction cup is communicated with the internal air passage of the pneumatic slip ring. A vacuum generating device (not shown in the figure) can be provided on the cantilever 330 and the fixed plate to make the internal air pressure of the suction cup less than the atmospheric pressure, or create a vacuum inside the suction cup to suck the insulating film 600. The rotating shaft of the rotating motor 341a is fixedly connected to the rotating end of the pneumatic slip ring to drive the rotation of the rotating end of the pneumatic slip ring. In this way, each time the insulating film 600 is picked up, the suction cup can adsorb and fix a single insulating film 600 above the stacked insulating films 600.

[0079] It can be understood that for the rotating motor 341a that drives the rotation of the rotating end of the fixed plate or the pneumatic slip ring, its rotating shaft can be directly connected to the rotating end of the fixed plate or the pneumatic slip ring, or can be first connected to a speed reduction mechanism and then connected to the rotating end of the fixed plate or the pneumatic slip ring by the speed reduction mechanism. The rotating motor 341a is preferably a servo motor, which can more accurately control the rotation angle of the jaw or the rotating end of the pneumatic slip ring.

[0080] In this embodiment, the secondary battery manufacturing equipment 1000 further includes a transmission device 800 fixed to the bracket 100. The transmission device 800 is electrically connected to the control device and is used to drive the flipping device 300 to move under the control of the control device, so that the flipping device 300 can clamp / flip the insulating film 600 at a suitable position and can be compatible with insulating films 600 of different specifications.

[0081] Specifically, the transmission device 800 includes a first driving mechanism 810 provided on the bracket 100 and a second driving mechanism 820 fixedly connected to the first driving mechanism 810. The second driving mechanism 820 is fixedly connected to the flipping device 300. Among them, the first driving mechanism 810 can drive the second driving mechanism 820 to move in the first direction, and the second driving mechanism 820 can drive the flipping device to move in the second direction. The first direction is perpendicular to the second direction. The two driving mechanisms can respectively achieve movements in different directions, so that the flipping device 300 can move to any position within the plane defined by the first direction and the second direction.

[0082] For example, the first driving mechanism 810 is a horizontal driving mechanism, including a horizontal sliding rail 811, a horizontal driving member, and a first mounting plate 812. The horizontal sliding rail 811 is fixed to the bracket 110, and its extending direction is the same as that of the cantilever 330. The first mounting plate 812 is movably disposed on the horizontal sliding rail 811. The horizontal driving member is fixed to the bracket 110, the horizontal sliding rail 811, or the first mounting plate 812, and the horizontal driving member is used to drive the first mounting plate 812 to move on the horizontal sliding rail 811. The second driving mechanism 820 is fixed to the first mounting plate 812. When the horizontal driving member works, the first mounting plate 812 is driven by the horizontal driving member to move along the horizontal sliding rail 811, and the first mounting plate 812 drives the second driving mechanism 820 to move synchronously, so that the flipping device 300 moves horizontally.

[0083] Furthermore, the second driving mechanism 820 is a vertical driving mechanism, including a vertical sliding rail 821, a vertical driving member 822, and a second mounting plate 823. The vertical sliding rail 821 is fixed to the first mounting plate 812. The second mounting plate 823 is movably disposed on the vertical sliding rail 821. The vertical driving member 822 is fixed to the first mounting plate 812, the vertical sliding rail 821, or the second mounting plate 823, and the vertical driving member 822 is used to drive the second mounting plate 823 to move on the vertical sliding rail 821. The flipping device 300 is fixed to the second mounting plate 823. Specifically, the second support member 310 is fixed to the second mounting plate 823. When the vertical driving member 822 works, the second mounting plate 823 is driven by the vertical driving member 822 to move along the vertical sliding rail 821, and the second mounting plate 823 drives the second support member 310 to move synchronously.

[0084] Alternatively, the connection relationship between the horizontal driving mechanism and the vertical driving mechanism can be set interchangeably. At this time, the first driving mechanism is a vertical driving mechanism. The vertical sliding rail 821 is fixed to the bracket 100. The second mounting plate 823 is movably disposed on the vertical sliding rail 821. The vertical driving member 822 is fixed to the bracket 100, the vertical sliding rail 821, or the second mounting plate 823, and the vertical driving member 822 is used to drive the second mounting plate 823 to move on the vertical sliding rail 821. The second driving mechanism is a horizontal driving mechanism and is fixed to the first mounting plate 923. When the vertical driving member 822 works, the second mounting plate 823 is driven by the vertical driving member 822 to move along the vertical sliding rail 821, and the second mounting plate 823 drives the horizontal driving mechanism to move synchronously.

[0085] Further, the horizontal slide rail 811 is fixed to the second mounting plate 823, the first mounting plate 812 is movably disposed on the horizontal slide rail 811, the horizontal driving member is fixed to the first mounting plate 812, the horizontal slide rail 811 or the second mounting plate 823, and the horizontal driving member is used to drive the second mounting plate 823 to move on the horizontal slide rail 811. The second support member 310 is then fixed to the first mounting plate 812. When the horizontal driving member operates, the first mounting plate 812 is driven by the horizontal driving member to move along the horizontal slide rail 811, and the first mounting plate 812 drives the second support member 310 to move synchronously, so that the flipping device 300 moves in the horizontal direction.

[0086] Optionally, the horizontal driving member and the vertical driving member 822 may be motors or electric cylinders. In some embodiments, the slide rail may be replaced with a conveyor belt or a screw-slider mechanism, and the effect is the same, which will not be elaborated here.

[0087] In some embodiments, the secondary battery manufacturing equipment 1000 further includes an alarm device (not shown in the figure) electrically connected to the control device. When the detection device 400 detects that the distance between the edge of the insulating film 600 close to the battery top cover 700 and the battery top cover 700 exceeds a preset range, the control device controls the flipping device 300 and the transmission device 800 to re-place the insulating film 600 multiple times according to a preset number of times. When the detection result still does not meet the requirements, the control device can control the alarm device to issue an alarm to remind the operator to intervene manually and control the alignment accuracy of the insulating film 600.

[0088] Optionally, the alarm device may be a sound alarm device, an optical signal alarm device, or a combination of the two, or it may be a warning message popped up on the display device, which will not be described in detail here.

[0089] An embodiment of the present invention further provides a method for manufacturing a secondary battery, which is applied to the above-mentioned secondary battery manufacturing equipment 1000. The manufacturing method includes:

[0090] S100. Flip the insulating film so that the insulating film covers the surface of the battery cell;

[0091] S200. Obtain the actual distance between the edge of the insulating film close to the battery top cover and the battery top cover, and determine whether the actual distance is within a preset range;

[0092] S201. If the actual distance is outside the preset range, re-place the insulating film and obtain the actual distance between the insulating film and the battery top cover again until the actual distance is within the preset range;

[0093] S202. If the actual distance is within the preset range, press the insulating film and weld the insulating film and the battery top cover;

[0094] S300. Perform an appearance inspection on the welding position to determine whether the appearance of the welding position meets the preset requirements;

[0095] S301. If it does not meet the preset requirements, remove the insulating film and perform welding again until it meets the preset requirements;

[0096] S302. If it meets the preset requirements, complete the processing and perform blanking.

[0097] For step S100, before flipping the insulating film 600 and disposing the insulating film 600 on the surface of the battery cell 500, the battery cell 500 and the insulating film 600 need to be placed in corresponding positions. For example, place the battery cell on the hot pressing table 210 and place the insulating film 600 on the film placement table 240. Specifically, equipment for transporting materials such as a conveyor belt and rollers can be used to transport the battery cell 500 to the hot pressing table 210 and transport the insulating film 600 to the film placement table 240. It can be understood that to improve production efficiency, the equipment for transporting the battery cell 500 and the equipment for transporting the insulating film 600 can be independently set to simultaneously and independently transport their respective corresponding materials.

[0098] In addition, other automatic feeding devices can be set. While feeding the battery cell 500 and the insulating film 600, place the battery top cover 700 at a specific position on the hot pressing table 210 for use in subsequent hot melting connection processes.

[0099] After the materials are in place and before detecting the actual distance between the edge of the insulating film 600 close to the battery top cover 700 and the battery top cover 700, the size of the battery cell 500 can be detected first to determine the specifications of the secondary battery to be manufactured, so as to call the corresponding data range in the storage medium storing the preset standard data. Specifically, by detecting parameters such as the contour, large surface, and thickness of the battery cell 500 through the detection device 400, after determining the relevant standard parameters of the secondary battery to be prepared, retrieve the relevant standard parameters from the control device as the comparison object for subsequent detection results. The control device then controls the flipping device 300 to flip the insulating film 600 to a suitable position based on the detection results sent by the detection device 400.

[0100] For step S200, after calling the relevant parameters, the detection device 400 detects the actual distance between the edge of the insulating film 600 close to the battery top cover 700 and the battery top cover 700, and compares the detection result with the called standard parameters to determine whether the actual distance is within the preset range.

[0101] It should be noted that in some cases, it is the control device that determines whether the actual distance meets the requirements. Specifically, the detection device 400 sends the detection result to the control device, and the control device receives the detection result and compares it with the standard parameters. In other cases, it is the detection device 400 that determines whether the actual distance meets the requirements. Before, during, or after the detection device 400 detects the above actual distance, the control device sends the corresponding standard parameters to the detection device 400 according to the detected specifications of the battery cell 500. The detection device 400 receives the standard parameters and compares and analyzes the detection result with the received standard parameters.

[0102] For step S201, specifically, if the detected actual distance exceeds the preset data range in the standard parameters, it indicates that the alignment accuracy of the current insulating film 600 does not meet the processing requirements. Then the control device sends a control instruction to the flipping device 300, and the flipping device 300 picks up the insulating film 600 on the battery cell 500 again, adjusts the position and then places the insulating film 600 on the battery cell 500. After that, step S200 is performed again until the detected actual distance is within the preset data range of the standard parameters.

[0103] In some embodiments, the upper limit of the number of times of automatically re - placing the insulating film 600 and / or automatically re - detecting can be preset according to the actual situation. For example, the upper limit can be set to 3 times. When the insulating film is re - placed 3 times and the corresponding detection results still do not meet the requirements, the alarm device issues an alarm, and manual intervention is carried out for management and control to ensure the smooth progress of the production process.

[0104] For step S202, specifically, if the detected actual distance is within the preset data range in the standard parameters, it indicates that the alignment accuracy of the current insulating film 600 meets the processing requirements. Then the control device sends control instructions to the pressing mechanism 220 and the hot - melting mechanism 230, so that the pressing plate 221 presses the battery cell 500 and the insulating film 600, and the heating module of the hot - melting mechanism 230 heats the hot - melting head 231 and drives the hot - melting head 231 to perform hot - melting connection on the insulating film 600 and the battery top cover 700.

[0105] In some embodiments, it further includes S203. Before or during pressing the insulating film 600, the control device controls the flipping device 300 to clamp the insulating film 600 again and pull the insulating film 600 taut. In this way, after the insulating film 600 is hot - melt connected to the battery top cover 700, it can fit smoothly on the surface of the battery cell 500.

[0106] For step S300, after the hot - melting connection is completed, the detection device 400 can detect the position where the insulating film 600 and the battery top cover 700 are welded, or detect the surface of the battery cell 500 at the same time, so as to determine whether the appearance of the welded product meets the expected requirements.

[0107] For step S301, when it is detected that the appearance of the processed product does not meet the requirements, manual control is carried out. Specifically, the products that do not meet the requirements are excluded from the production line manually, and the insulation film 600 on the products is removed, and the remaining battery cells 500 and battery top covers 700 are placed back on the feeding device, and feeding and processing are carried out again until the processed product meets the requirements.

[0108] For step S302, when it is detected that the appearance of the processed product meets the requirements, the processed product can be removed by an automatic blanking device and enter the subsequent processing process.

[0109] The preparation equipment and preparation method of the secondary battery provided by the embodiment of the present invention are introduced in detail above. Specific examples are used in this article to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the idea of the present invention. There will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A secondary battery preparation device, characterized in that: include: Bracket; The hot-melt device comprises a hot-pressing platform fixed on the bracket, and a pressing mechanism and a hot-melt mechanism arranged opposite to the hot-pressing platform, the pressing mechanism comprises a pressing plate, the hot-melt mechanism comprises a hot-melt head arranged at a distance from the pressing plate, the orthographic projection of the part of the pressing plate close to the hot-melt head on the hot-pressing platform can cover the orthographic projection of the part of the insulating film close to the hot-melt head on the hot-pressing platform, and the side wall of the pressing plate close to the hot-melt head is provided with an avoidance groove for the hot-melt head to pass through; the hot-pressing platform is used to carry the battery cell, the pressing plate is used to press and fix the insulating film on the surface of the battery cell, and the hot-melt head is used to weld the insulating film and the battery top cover; the pressing plate can cover the pole ear of the battery cell so that the pressing plate can flatten the pole ear; A flipping device is arranged opposite to the hot melt device and is movably arranged on the bracket, and is used to clamp the insulating film and flip the insulating film to the hot pressing table so that the insulating film covers the surface of the battery cell; A detection device, arranged opposite to the flipping device and adjacent to the hot melt device, the detection device being used to detect the gap between the insulating film on the battery cell and the battery top cover in real time after the flipping device flips the insulating film; A control device, electrically connected to the hot-melt device, the flip device and the detection device, the control device is used to send operation commands to the hot-melt device, the flip device and the detection device, and receive detection information sent by the detection device; When the detection result of the detection device shows that the actual distance between the insulating film and the battery top cover exceeds the preset range, the control device is configured to control the pressing mechanism to press the insulating film and the battery cell according to the detection result to eliminate the influence caused by the tab protrusion; Then check whether the actual distance between the insulating film and the battery top cover meets the requirements. If so, perform hot melt connection; If not, the flipping device is controlled to re-clamp, flip and place the insulating film until the detection result meets the requirement.

2. The secondary battery manufacturing device according to claim 1, characterized in that: The hot melt mechanism also includes a first support member, a hot melt driving member and a hot melt head fixing member, the first support member is fixed to the bracket, there are multiple hot melt heads, and the multiple hot melt heads are fixed to the hot melt head fixing member at intervals, the hot melt driving member is fixed to the first support member or the hot melt head fixing member, and the hot melt driving member is used to drive the hot melt head fixing member to drive the multiple hot melt heads to move in the vertical direction; there are multiple avoidance grooves, and the avoidance grooves and hot melt heads are arranged one by one.

3. The secondary battery manufacturing device according to claim 2, characterized in that: The clamping mechanism includes a first mounting member and a clamping driving member. The first mounting member and the hot melt head fixing member are fixed on the same side of the first supporting member. The clamping plate is movably connected to the first mounting member and is located on the side of the hot melt head fixing member facing the hot pressing platform. The clamping driving member is fixed to the first mounting member. The clamping driving member is used to drive the clamping plate to clamp the insulating film or release the insulating film.

4. The secondary battery manufacturing device according to claim 2, characterized in that: The detection device is disposed adjacent to the first support member and is used to detect whether the distance between the edge of the insulating film close to the battery top cover and the battery top cover after flipping is within a preset range. If it is within the preset range, the detection device sends the first detection information to the control device, and the control device controls the pressing mechanism to press the insulating film and controls the hot melt mechanism to weld the insulating film and the battery top cover; If it exceeds the preset range, the detection device sends second detection information to the control device, the control device controls the flip device to clamp the insulating film again and adjust the position of the insulating film, and the detection device performs detection again.

5. The secondary battery manufacturing device according to claim 1, characterized in that: The flipping device comprises a second support member, a cantilever driving member, two cantilevers and two clamping mechanisms, wherein the second support member is movably arranged on the bracket, the cantilever driving member is fixed to the second support member, the two cantilevers are arranged in parallel and are movably arranged on the second support member, and the two clamping mechanisms are arranged opposite to each other and are fixed to the two cantilevers in a one-to-one correspondence; The cantilever driving member is transmission-connected to the two cantilevers to drive the two cantilevers to drive the two clamping mechanisms to move closer to each other or farther away from each other.

6. The secondary battery manufacturing device according to claim 5, characterized in that: The clamping mechanism includes a power assembly and a clamping claw connected to the power assembly in a transmission manner. The power assembly is fixed to the cantilever. The power assembly is used to drive the clamping claw to clamp the insulating film or release the insulating film, and drive the clamping claw to flip the insulating film.

7. The secondary battery manufacturing device according to claim 6, characterized in that: The power assembly includes a rotating motor and a clamping jaw driving member, wherein the rotating motor is fixed to the cantilever, the clamping jaw driving member is transmission-connected to the rotating shaft of the rotating motor, and the clamping jaw is transmission-connected to the clamping jaw driving member; The rotary motor is used to drive the clamping jaw driving member to rotate, and the clamping jaw driving member is used to drive the clamping jaw to open, close and / or rotate.

8. The secondary battery manufacturing device according to claim 6, characterized in that: The clamping claw comprises two clamping arms arranged opposite to each other, the two clamping arms have clamping ends for clamping the insulating film, the two clamping ends are provided with flexible clamping parts, and the two clamping arms clamp the insulating film through the flexible clamping parts.

9. The secondary battery manufacturing device according to claim 1, characterized in that: It also includes a transmission device fixed on the bracket, the transmission device includes a first driving mechanism arranged on the bracket and a second driving mechanism fixedly connected to the first driving mechanism, the second driving mechanism is fixedly connected to the flipping device; the first driving mechanism is used to drive the second driving mechanism to drive the flipping device to move along a first direction, the second driving mechanism is used to drive the flipping device to move along a second direction, and the first direction is perpendicular to the second direction.

10. A method for preparing a secondary battery, based on the secondary battery preparation device according to any one of claims 1 to 9, characterized in that: The preparation method comprises: Turning over the insulating film so that the insulating film covers the surface of the battery cell; Obtaining an actual distance between an edge of the insulating film close to the battery top cover and the battery top cover, and determining whether the actual distance is within a preset range; If the actual distance is outside the preset range, reposition the insulating film and obtain the actual distance between the insulating film and the battery top cover again until the actual distance is within the preset range; If the actual distance is within a preset range, the insulating film is pressed tightly, and the insulating film and the battery top cover are welded; Perform appearance inspection on the welding position to determine whether the appearance of the welding position meets the preset requirements; If it does not meet the preset requirements, remove the insulating film and re-weld it until it meets the preset requirements; If it meets the preset requirements, the processing is completed and the material is cut; If the actual distance is outside the preset range, repositioning the insulating film and obtaining the actual distance between the insulating film and the battery top cover again until the actual distance is within the preset range includes: When the actual distance between the insulating film and the battery top cover exceeds the preset range, the insulating film and the battery cell are pressed tightly and the pole ears of the battery cell are flattened to eliminate the impact caused by the protrusion of the pole ears; then the actual distance between the insulating film and the battery top cover is checked to see if it meets the requirements. If so, hot-melt connection is performed; if not, the insulating film is re-clamped, flipped and placed until the test results meet the requirements.

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