Foam pasting device for laminated lithium battery

Abstract

The utility model discloses a foam pasting device for a laminated lithium battery, which relates to the technical field of new energy, and comprises a discharging mechanism, a cutting mechanism, a rubberizing mechanism and a receiving mechanism, foam is loaded on the discharging mechanism, and the end part of the foam is arranged on the receiving mechanism through the cutting mechanism and the rubberizing mechanism in sequence; foam is attached to the tab welded to the cover plate through the rubberizing mechanism, the rubberizing mechanism comprises a rubberizing roller and rubberizing guide wheels, the rubberizing guide wheels are arranged on the two sides of the rubberizing roller respectively, and the foam penetrates through a gap between the rubberizing roller and one rubberizing guide wheel. After being transited by the rubber roller, the material passes through a gap between the rubber roller and the other rubberizing guide wheel and is connected to the material clamping traction mechanism; according to the foam pasting device, the yield when a battery cell enters a shell after the cover plate tab is welded is increased, and the integrity of the tab is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy, in particular to a foam-attached device for a laminated lithium battery. Background Art

[0002] Lithium-ion battery is a secondary battery (rechargeable battery), which mainly relies on the movement of lithium ions between the positive and negative electrodes to work. Lithium-ion batteries are widely used in biochemistry as energy sources for equipment due to their high energy, long cycle times, and high efficiency. Lithium manganese iron phosphate batteries are an emerging lithium-ion battery on the market. Lithium manganese phosphate is limited by its one-dimensional lithium ion diffusion channels and insulating PO4 polyanion framework, resulting in low ion conductivity, especially its electronic conductivity is lower than that of lithium iron phosphate. Lithium manganese iron phosphate not only has all the advantages of lithium manganese phosphate, but also has better electronic conductivity, better rate and cycle performance.

[0003] Since the structure of lithium iron phosphate battery is the same as that of lithium iron phosphate battery, and the composition of the positive electrode material is also similar, it has higher stability. The biggest difference is that the lithium iron phosphate battery has additional manganese material added, but it does not affect its safety. The thermal stability and safety of the battery are as good as those of lithium iron phosphate battery.

[0004] Lithium manganese iron phosphate batteries have the same cycle life as lithium iron phosphate batteries, both of which are more than 2,000 charge and discharge cycles. If there is a better battery management strategy, its life can theoretically reach up to 3,000 times, which is higher than Ternary lithium Battery.

[0005] For the development process of lithium manganese iron phosphate battery cell equipment, lithium battery stacking technology is used, with positive and negative tabs on the left and right, making full use of the battery space and having a higher capacity density. At present, the existing stacking process battery has tabs on both sides, and the cover plate connecting pieces on both sides are welded and then the sealing perimeter is fully welded twice. The number of welding times is large, the laser cost is high, and it also affects the overall production line production efficiency and qualification rate.

[0006] Existing square laminated lithium batteries generally have positive and negative tabs on both sides. For laminated batteries with positive and negative tabs on one side, the protection problem of the left and right tabs when entering the shell has always been a common problem in the industry, resulting in scratches and damage to the battery cells when entering the shell, causing short circuits and NG, affecting product qualification rate and production line efficiency. Utility Model Content

[0007] Based on the technical problems existing in the background technology, the utility model proposes a foam pasting device for a laminated lithium battery, which increases the yield rate when the battery cell is put into the shell after the welding of the cover plate tab is completed, and ensures the integrity of the tab.

[0008] The utility model provides a foam-attaching device for a laminated lithium battery, comprising a feeding mechanism, a cutting mechanism, a gluing mechanism and a receiving mechanism. The foam is loaded on the feeding mechanism and the end is sequentially passed through the cutting mechanism and the gluing mechanism and arranged on the receiving mechanism. The pole ear welded with the cover plate is attached to the foam through the gluing mechanism.

[0009] Furthermore, it also includes a material pressing mechanism, which is arranged between the material discharging mechanism and the cutting mechanism and is used to adjust the flatness of the foam.

[0010] Furthermore, it also includes a material clamping and traction mechanism, which is arranged between the gluing mechanism and the material receiving mechanism and is used to pull and receive the bottom film of the foam.

[0011] Furthermore, the gluing mechanism includes a gluing roller and a gluing guide wheel, and the gluing guide wheels are respectively arranged on both sides of the gluing roller. The foam passes through the gap between the gluing roller and one of the gluing guide wheels, and then passes through the gap between the gluing roller and the other gluing guide wheel after transition through the gluing roller to be connected to the material clamping traction mechanism.

[0012] Furthermore, it also includes a placement mechanism for loading the battery cells welded to the cover plate, the placement mechanism includes a placement table and a first linear module for driving the placement table to move, the placement table is arranged on one side of the gluing mechanism so that the foam is attached to the battery cell tabs on the placement table through the gluing mechanism.

[0013] Furthermore, it also includes a loading platform and a second linear module for driving the loading platform to move. The material unloading mechanism, cutting mechanism, gluing mechanism, clamping and traction mechanism and material receiving mechanism are all arranged on the loading platform. The movement direction of the first linear module is perpendicular to the movement direction of the second linear module.

[0014] Furthermore, the material clamping and traction mechanism is slidably arranged with the loading platform.

[0015] The advantages of the foam device for laminated lithium battery provided by the utility model are: the foam device for laminated lithium battery provided in the structure of the utility model avoids the problems of corrosion resistance, breakage, short circuit, etc. caused by the brown high-temperature tape for the foam cotton of the pole ear. At the same time, it also effectively improves the protection of the pole ears on both sides of the square laminated battery and the pole ears of the positive and negative structures of the cover plate on one side, which caters to the diversity of market demand more safely and effectively; it is applied to the cover plate laser welding machine equipment, which increases the yield rate of the battery cell when entering the shell after the cover plate pole ear welding is completed, ensures the integrity of the pole ear, can greatly improve the efficiency of lithium-ion battery production and reduce the product waste caused by unqualified due to scratches and wear when the cover plate pole ear is entered into the shell after welding, which is conducive to improving the OEE of the battery cell assembly production line. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1It is a schematic diagram of the structure of the utility model;

[0017] Figure 2 for Figure 1 A top view of

[0018] Figure 3 for Figure 1 A front view of

[0019] Figure 4 for Figure 1 Left view of;

[0020] Figure 5 is a schematic diagram of the structure of the cover plate;

[0021] Among them, 1-feeding mechanism, 2-cutting mechanism, 3-gluing mechanism, 4-receiving mechanism, 5-pressing mechanism, 6-clamping and traction mechanism, 7-placing mechanism, 8-loading platform, 9-second linear module, 31-glueing roller, 32-glueing guide wheel, 71-placing table, 72-first linear module. DETAILED DESCRIPTION

[0022] Below, the technical solution of the utility model is described in detail through specific embodiments. Many specific details are described in the following description to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described here, and those skilled in the art can make similar improvements without violating the connotation of the utility model. Therefore, the utility model is not limited by the specific implementation disclosed below.

[0023] like Figures 1 to 5 As shown, the utility model proposes a foam-attaching device for laminated lithium batteries, comprising a feeding mechanism 1, a cutting mechanism 2, a gluing mechanism 3 and a receiving mechanism 4. The foam is loaded on the feeding mechanism 1 and the end thereof passes through the cutting mechanism 2 and the gluing mechanism 3 in sequence and is arranged on the receiving mechanism 4. The pole ear welded with the cover plate is attached to the foam through the gluing mechanism 3.

[0024] The foam is unwound by the unwinding mechanism 1, and then the cutting mechanism 2 cuts the foam, but the bottom film of the foam is not cut and is still continuous. The cut foam follows the bottom film to the gluing mechanism 3, and the foam is attached to the pole ear by the gluing mechanism 3. The bottom film is recovered by the receiving mechanism to achieve effective attachment of the foam to the pole ear. When the attached pole ear is put into the shell, it will not be scratched or damage the battery cell, causing defects such as short circuit and NG. Therefore, this embodiment can achieve effective protection of the pole ear without affecting the capacity ratio of the lithium battery to the minimum extent. The foam attachment device has high cost performance and is easy to mass produce. It is suitable for application after welding with the laminated battery cover plate, which improves the product qualification rate and production line efficiency.

[0025] During the foam discharge process, in order to improve the flatness of the foam and to improve the cutting efficiency and quality of the foam by the cutting mechanism 2, a pressing mechanism 5 is set as a preferred scheme in this embodiment. The pressing mechanism 5 is set between the discharge mechanism 1 and the cutting mechanism 2, and is used to adjust the flatness of the foam. The pressing mechanism 5 can be set as an upper and lower roller. The foam passes through the gap between the upper and lower rollers to adjust the surface flatness of the foam by rolling the rollers under a certain pressure, so that the cutting mechanism 2 faces the flattened foam, thereby improving the cutting accuracy of the foam by the cutting mechanism 2. At the same time, the flattened foam is also easy to be attached to the pole ear through the gluing mechanism 3, avoiding the problem of poor pole ear attachment quality caused by defects such as corners and depressions in the foam; wherein the cutting mechanism 2 can directly adopt the existing mechanism, for example, a relay controls the up and down movement of the cutter to achieve the cutting of the foam, and the discharge mechanism 1 and the receiving mechanism 4 can adopt the existing unwinding and winding mechanisms.

[0026] In addition, during the process of collecting the bottom film of the foam, if the bottom film is directly rolled up on the collecting mechanism 4, it is easy to cause rolling and folding defects due to the looseness of the bottom film. Therefore, this embodiment sets a clamping and traction mechanism 6 as a preferred solution. The clamping and traction mechanism 6 is set between the gluing mechanism 3 and the collecting mechanism 4, and is used to pull and collect the bottom film of the foam; the clamping and traction mechanism 6 can use a tensioning wheel to tighten the bottom film, so as to improve the flatness of the bottom film rolling and the rolling down.

[0027] In this embodiment, the gluing mechanism 3 includes a gluing roller 31 and a gluing guide wheel 32. The gluing guide wheels 32 are respectively arranged on both sides of the gluing roller 31. The foam passes through the gap between the gluing roller 31 and one of the gluing guide wheels 32, and then passes through the gap between the gluing roller 31 and the other gluing guide wheel 32 after the transition of the gluing roller 31 to be connected to the clamping traction mechanism 6. The setting of the gluing guide wheel 32 enables the foam to stably pass through the gluing roller 31, thereby improving the attachment stability of the foam when attached to the pole lug. In addition, the gluing roller 31 is directly rolled to facilitate the foam to be attached to the pole lug by rolling.

[0028] In this embodiment, the foam-pasting device for laminated lithium batteries further includes a placement mechanism 7 for loading the battery cell welded with the cover plate, the placement mechanism 7 includes a placement table 71 and a first linear module 72 for driving the placement table 71 to move, the placement table 71 is arranged on one side of the gluing mechanism 3, so as to paste the foam on the battery cell tabs on the placement table 71 through the gluing mechanism 3. The first linear module 72 drives the placement mechanism 7 to move, and the battery cell moves near the gluing roller 31, so as to facilitate the adjustment of the relative position of the battery cell tab and the gluing roller 31, thereby providing a position adjustment basis for the gluing roller 31 to accurately paste the foam on the tabs.

[0029] The first linear module 72 moves in one direction (for example, left and right) to adjust the left and right position between the cell tab and the glue roller 31. In order to adjust the front and back position between the cell tab and the glue roller 31, the present embodiment is provided with a loading platform 8 and a second linear module 9 for driving the loading platform 8 to move. The material discharge mechanism 1, the cutting mechanism 2, the glue mechanism 3, the material clamping and pulling mechanism 6 and the material receiving mechanism 4 are all arranged on the loading platform 8. The movement direction of the first linear module 72 is perpendicular to the movement direction of the second linear module 9. The second linear module 9 drives the front and back movement of the loading platform 8 to adjust the front and back position between the cell tab and the glue roller 31; therefore, the arrangement of the first linear module 72 and the second linear module 9 realizes the front and back, left and right position adjustment between the cell tab and the glue roller 31, and provides a position basis for the stable foaming of the cell tab.

[0030] Working process: The foam is unrolled through the unwinding mechanism 1, flattened by the pressing mechanism 5 and then enters the cutting mechanism 2 for foam cutting. The foam used for attachment is cut off, but the bottom film of the foam is not cut off. The cut foam enters the gluing mechanism 3 along with the bottom film. The cut foam is attached to the pole ear, and the bottom film is transferred to the receiving mechanism 4 through the clamping and traction mechanism 6 to complete the operation of attaching the pole ear to the foam.

[0031] This embodiment can be used for square battery structures with tabs on both sides and positive and negative electrodes on one side. By applying foam to the tabs on both sides after laser welding, effective protection can be provided when the battery cell is put into the shell. It can play a protective role at a relatively small space utilization rate, and basically has no effect on the battery capacity ratio while providing safety protection for the tabs. The foam-applying device for laminating lithium batteries of this embodiment avoids corrosion resistance, breakage, short circuit and other problems caused by brown high-temperature tape. At the same time, it also effectively improves the tab protection for the tabs on both sides of the square laminating battery and the positive and negative electrode structure of the cover plate on one side, and caters to the diversity of market demand more safely and effectively. It greatly improves the qualification rate and safety of the product assembly process.

[0032] In addition, this embodiment is applied to the cover plate laser welding machine equipment, which increases the yield rate when the battery cell is put into the shell after the cover plate pole ear welding is completed, ensures the integrity of the pole ear, can greatly improve the efficiency of lithium-ion battery production and reduce product waste caused by scratches, wear and tear on the cover plate pole ear when it is put into the shell after welding, which is beneficial to improving the OEE of the battery cell assembly production line.

[0033] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A foam device for laminated lithium battery, characterized in that: The invention comprises a material discharging mechanism (1), a cutting mechanism (2), a gluing mechanism (3) and a material receiving mechanism (4); the foam is loaded on the material discharging mechanism (1) and the end thereof passes through the cutting mechanism (2) and the gluing mechanism (3) in sequence and is arranged on the material receiving mechanism (4); the pole ear welded to the cover plate is attached to the foam through the gluing mechanism (3).

2. The laminated lithium battery foam device according to claim 1, characterized in that: It also comprises a material pressing mechanism (5), which is arranged between the material discharging mechanism (1) and the cutting mechanism (2) and is used to adjust the flatness of the foam.

3. The laminated lithium battery foam device according to claim 1, characterized in that: It also comprises a material clamping and traction mechanism (6), which is arranged between the gluing mechanism (3) and the material collecting mechanism (4) and is used for traction and collection of the foam base film.

4. The laminated lithium battery foam device according to claim 3, characterized in that: The gluing mechanism (3) comprises a gluing roller (31) and a gluing guide wheel (32), and the gluing guide wheels (32) are respectively arranged on both sides of the gluing roller (31). The foam passes through the gap between the gluing roller (31) and one of the gluing guide wheels (32), and then passes through the gap between the gluing roller (31) and the other gluing guide wheel (32) after transition through the gluing roller (31) to be connected to the material clamping traction mechanism (6).

5. The laminated lithium battery foam device according to claim 3, characterized in that: It also includes a placement mechanism (7) for loading the battery cell welded to the cover plate, the placement mechanism (7) including a placement table (71) and a first linear module (72) for driving the placement table (71) to move, the placement table (71) being arranged on one side of the gluing mechanism (3) so that the battery cell tabs on the placement table (71) can be attached with foam through the gluing mechanism (3).

6. The foam device for laminated lithium battery according to claim 5, characterized in that: It also includes a loading platform (8) and a second linear module (9) for driving the loading platform (8) to move. A material unloading mechanism (1), a cutting mechanism (2), a gluing mechanism (3), a material clamping and traction mechanism (6) and a material receiving mechanism (4) are all arranged on the loading platform (8). The movement direction of the first linear module (72) is perpendicular to the movement direction of the second linear module (9).

7. The laminated lithium battery foam device according to claim 6, characterized in that: The material clamping and traction mechanism (6) and the loading platform (8) are slidably arranged.

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