Aluminum plastic film heat sealing structure

Abstract

The utility model discloses an aluminum plastic film heat sealing structure which comprises a tool frame, a lower sealing cutter, an upper sealing cutter and a driving structure are arranged on the tool frame, the upper sealing cutter is arranged above the lower sealing cutter, and the driving structure controls the upper sealing cutter to move up and down so as to be matched with the lower sealing cutter. Oil cavities are formed in the lower sealing knife and the upper sealing knife, and the oil cavities are filled with silicone oil and provided with electric heating tubes. The utility model aims to solve the technical problems in the prior art, and provides an aluminum-plastic film heat-sealing structure which can well improve the overall stability of heat on the surface of a sealing cutter by conducting stable oil temperature to the sealing cutter.

Description

Technical Field

[0001] The utility model relates to the technical field of heat sealing equipment, in particular to an aluminum-plastic film heat sealing structure. Background Art

[0002] At present, some square battery cells in the industry use aluminum-plastic film as the packaging composite film material. These battery cells are generally called soft-pack battery cells. Aluminum-plastic film packaging generally adopts hot pressing packaging process, and the sealing knife is heated to the range of 175℃-200℃. The sealing knife is generally made of copper and steel. These two materials have the characteristics of good thermal conductivity and fast heating, but they also have disadvantages such as large temperature fluctuations and rapid cooling and deformation.

[0003] In order to facilitate processing, the sealing knife of the existing packaging tooling basically adopts a full-material solid structure design. The main defects of this structure are: when the electric heating tube is heated, the knife body heats up rapidly, the heat radiation of the heating tube body is uneven, and the heat conduction is also inconsistent, resulting in inconsistent temperature along the length of the sealing knife. Generally, the temperature in the middle of the sealing knife is higher and the temperature at both ends is lower. As a result, when the aluminum-plastic film is sealed, the CPP layer in the middle part is more hot-melted and less melted at both ends. The product inspection data is reflected in 1. The thickness of the aluminum-plastic film is uneven at the sealing point, with a smaller value in the middle and a larger value on both sides; 2. The consistency of the peeling tensile force value during the packaging strength test is poor; during the appearance inspection, the uniformity of the tearing surface of the hot melt section is unqualified, and even the over-melting phenomenon of the exposed aluminum foil layer occurs, and other quality problems. Utility Model Content

[0004] 1. Technical problems to be solved by the utility model

[0005] The utility model aims to solve the technical problems existing in the prior art and provides an aluminum-plastic film heat sealing structure, which can improve the overall thermal stability of the sealing knife surface by conducting stable oil temperature to the sealing knife.

[0006] 2. Technical solution

[0007] In order to solve the above problems, the technical solution provided by the utility model is:

[0008] An aluminum-plastic film heat-sealing structure comprises a tooling frame, on which a lower sealing knife, an upper sealing knife and a driving structure are arranged, the upper sealing knife is arranged above the lower sealing knife, and the driving structure controls the upper sealing knife to move up and down to cooperate with the lower sealing knife; the lower sealing knife and the upper sealing knife are both provided with oil cavities, the oil cavities are filled with silicone oil and are provided with electric heating pipes.

[0009] Optionally, a horizontal side of the lower sealing knife and the upper sealing knife is provided with a groove connected to the oil chamber, and the groove is connected to a cavity sealing cover via a cavity sealing member.

[0010] Optionally, two oil nozzles are provided at the upper end of the lower sealing knife, and at least one oil nozzle is provided at the upper end of the upper sealing knife.

[0011] Optionally, the lower sealing knife is connected to the tooling frame via a lower heat insulation plate.

[0012] Optionally, the driving structure comprises a cylinder, an output end of the cylinder is connected to a connecting plate, and the upper sealing knife is connected to the connecting plate via an upper heat insulation plate.

[0013] Optionally, a guide rod is connected to the connecting plate, and a guide hole matching with the guide rod is provided on the tooling frame.

[0014] Optionally, a fixing plate is connected to the tooling frame, a lower positioning piece is provided on the fixing plate, an upper positioning piece is provided on the connecting plate, and when the lower sealing knife and the upper sealing knife cooperate, the lower positioning piece and the upper positioning piece abut against each other.

[0015] Optionally, a first positioning slope is provided on the top of the lower positioning member, and a second positioning slope is provided on the top of the upper positioning member, the first positioning slope and the second positioning slope are abutted and matched, and a positioning adjustment structure for controlling the horizontal movement of the lower positioning member is provided on the fixing plate.

[0016] Optionally, a buffer member abutting against the connecting plate is provided on the fixing plate.

[0017] 3. Beneficial effects

[0018] Compared with the prior art, the technical solution provided by the utility model has the following beneficial effects:

[0019] This aluminum-plastic film heat-sealing structure is used to improve the overall temperature uniformity of the sealing knife, improve the consistency of the hot melt amount of the sealing PP layer and the uniform effect of the sol, and improve the packaging quality. The present invention utilizes the advantages of the temperature change stability and heat preservation of the liquid, fills the liquid inside the sealing knife, and uses it as a heat compensation source to balance and compensate for the heat dissipated from the surface of the sealing knife, increasing the effect of slower cooling of the sealing knife, and also improving the problem of sudden increase in internal heat when the heating tube is started, causing the surface temperature of the sealing knife to suddenly rise. The oil body acts as an intermediate buffer to achieve precise temperature control. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic structural diagram of an aluminum-plastic film heat-sealing structure proposed in an embodiment of the utility model;

[0021] Figure 2 A schematic diagram of the structure of upper and lower sealing knives in an aluminum-plastic film heat-sealing structure proposed in an embodiment of the utility model;

[0022] Figure 3It is an exploded schematic diagram of the upper and lower sealing knives in an aluminum-plastic film heat-sealing structure proposed in an embodiment of the utility model;

[0023] Figure 4 A schematic diagram of the structure of positioning and adjusting the upper and lower sealing knives in an aluminum-plastic film heat-sealing structure proposed in an embodiment of the utility model;

[0024] Figure 5 A schematic diagram of the structure of upper and lower positioning members in an aluminum-plastic film heat-sealing structure proposed in an embodiment of the utility model;

[0025] 1. Tooling frame; 2. Lower sealing knife; 3. Upper sealing knife; 4. Driving structure; 41. Cylinder; 42. Connecting plate; 5. Electric heating pipe; 6. Cavity sealing member; 7. Cavity sealing cover; 8. Oil nozzle; 9. Lower heat insulation board; 10. Upper heat insulation board; 11. Guide rod; 12. Fixed plate; 13. Lower positioning member; 13a. First positioning inclined plane; 14. Upper positioning member; 14a. Second positioning inclined plane; 15. Positioning adjustment structure; 16. Buffer member. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific implementation methods described here are only used to explain the utility model and do not limit the protection scope of the utility model.

[0027] It should be noted that when an element is referred to as being "fixed to", "disposed on", "fixed on" or "installed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. Further, when an element is considered to be "fixedly connected to" another element, the two may be fixed in a detachable connection manner or in a non-detachable connection manner, such as socketing, snap-on, one-piece fixation, welding, etc., which can be achieved in the prior art and will not be repeated here. When an element is perpendicular or approximately perpendicular to another element, it means that the ideal state of the two is vertical, but due to the influence of manufacturing and assembly, there may be a certain vertical error. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0029] The “first” and “second” involved in the present invention do not represent specific quantities and orders, but are merely used to distinguish names.

[0030] Combined with Figure 1-5 The aluminum-plastic film heat-sealing structure of the present embodiment comprises a tool frame 1, on which a lower sealing knife 2, an upper sealing knife 3 and a driving structure 4 are arranged, the upper sealing knife 3 is arranged directly above the lower sealing knife 2, the upper sealing knife 3 and the lower sealing knife 2 are arranged with an interval up and down, and the driving structure 4 controls the upper sealing knife 3 to move up and down to cooperate with the lower sealing knife 2; the lower sealing knife 2 and the upper sealing knife 3 are both provided with an oil cavity, the oil cavity is filled with silicone oil and is provided with an electric heating pipe 5, utilizing the high temperature resistance and large specific heat capacity of silicone oil (specific heat c is about 2000J / (kg*℃), As well as good fluidity, when the electric heating tube is heated, the heat is first transferred to the silicone oil, the silicone oil absorbs heat and slowly heats up, and then conducts the heat to the sealing knife structure (the specific heat capacity c of steel material is about 460J / (kg*℃), and the specific heat capacity c of brass material is about 380J / (kg*℃)). During the sealing knife operation, the temperature drop caused by heat exchange with the environment is also quickly leveled by the internal oil temperature, and there is no need for high-frequency starting heating of the heating tube. Therefore, the thermal insulation of the oil body and the good thermal conductivity of the steel body are combined to ensure that the temperature of the entire surface of the knife body is relatively stable.

[0031] As a preferred solution of the present utility model, temperature sensors are provided on the outer walls of the lower sealing blade 2 and the upper sealing blade 3 in contact with each other.

[0032] As a preferred solution of the utility model, the horizontal side of the lower sealing knife 2 and the upper sealing knife 3 is provided with a slot connected to the oil chamber, and the slot is connected to the cavity sealing cover 7 through the cavity sealing member 6, and the cavity sealing member 6 is arranged around the slot, and the cavity sealing cover 7 is connected to the sealing knife through a fastener structure such as bolts to achieve sealing and fixing; the parallelism, flatness, and mirror degree control of the bottom reference surface and the sealing surface are achieved by side slotting, so as to avoid increasing the processing error and assembly error of the parts. Because when the upper and lower sealing knives are working, the upper and lower blade surfaces must be aligned and parallel, and cannot be misplaced or tilted. This design method ensures that the processing requirements of the sealing knife only require fine processing and fine grinding of the assembly bottom surface and the blade surface, and the processing accuracy of the side slots and the cavity sealing cover 7 is not high, reducing the processing cost; when assembling the sealing knife body, it is only required to ensure the sealing performance, and the lateral position shape and position errors generated by the assembly have no correlation with the alignment of the upper and lower knife components, reducing the difficulty of assembly. Therefore, the side slot structure avoids increasing the processing error and assembly error of the knife body.

[0033] As a preferred solution of the utility model, two oil nozzles 8 are provided at the upper end of the lower sealing knife 2, and at least one oil nozzle 8 is provided at the upper end of the upper sealing knife 3. Because the silicone oil in the lower sealing knife 2 needs to be filled, the advantage of the double hole effect is that it is convenient for exhaust and it is convenient to observe whether the oil level is full; and the silicone oil in the upper sealing knife 3 only needs to immerse the electric heating tube 5.

[0034] As a preferred solution of the utility model, in order to slow down the heat loss of the lower sealing knife 2 as much as possible, the lower sealing knife 2 is connected to the tooling frame 1 through the lower heat insulation plate 9.

[0035] As a preferred solution of the utility model, the driving structure 4 includes a cylinder 41, which is installed on the top of the tooling frame 1, with its output shaft arranged downward and the output end connected to a connecting plate 42, and the upper sealing knife 3 is connected to the connecting plate 42 through an upper heat insulation plate 10, and the upper sealing knife 3 is directly controlled by the cylinder 41 to move up and down, and the heat loss of the upper sealing knife 3 is slowed down by the setting of the upper heat insulation plate 10.

[0036] As a preferred solution of the utility model, a guide rod 11 is connected to the connecting plate 42, and the guide rod 11 is arranged parallel to the output shaft of the cylinder 41. A guide hole cooperating with the guide rod 11 is provided on the top of the tooling frame 1, thereby ensuring the stability of the connecting plate 42 when it moves up and down.

[0037] As a preferred embodiment of the present utility model, a fixing plate 12 is connected to the tooling frame 1, and the fixing plate 12 is arranged on the horizontal side of the lower sealing knife 2. A lower positioning piece 13 is provided on the fixing plate 12, and the fixing plate 12 and the lower positioning piece 13 will not affect the cooperation between the upper sealing knife 3 and the lower sealing knife 2. An upper positioning piece 14 is provided on the connecting plate 42, and the upper positioning piece 14 is arranged directly above the lower positioning piece 13. When the lower sealing knife 2 and the upper sealing knife 3 cooperate, the lower positioning piece 13 and the upper positioning piece 14 abut against each other, which can ensure that the upper sealing knife 3 is pressed down into place, and the upper and lower sealing knives can be in contact with each other to prevent the impact and damage to the knife surface.

[0038] As a preferred solution of the utility model, the top of the lower positioning member 13 is provided with a first positioning inclined surface 13a, and the top of the upper positioning member 14 is provided with a second positioning inclined surface 14a. The first positioning inclined surface 13a and the second positioning inclined surface 14a both extend along the first direction and are inclinedly arranged. Figure 5As shown, the left end of the first positioning slope 13a is higher than the right end, and the left end of the second positioning slope 14a is lower than the right end. The first positioning slope 13a and the second positioning slope 14a are abutted and matched. A positioning adjustment structure 15 for controlling the horizontal movement of the lower positioning member 13 is provided on the fixed plate 12. The positioning adjustment structure 15 controls the lower positioning member 13 to move along the first direction on the fixed plate 12. When the lower positioning member 13 moves to the right, the height of the upper positioning member 14 when abutting against the lower positioning member 13 becomes higher, thereby increasing the spacing between the upper and lower sealing knives. In this embodiment, the slope ratios of the lower positioning member 13 and the upper positioning member 14 are both 1:100, and the height is adjusted by 0.01 mm for a horizontal adjustment of 1 mm, thereby accurately controlling the descending position of the upper sealing knife 3.

[0039] As a preferred solution of the present utility model, the positioning adjustment structure 15 can specifically be a combination structure of a motor and a screw, or a cylinder with higher precision, or even a manual structure.

[0040] As a preferred solution of the utility model, a buffer 16 is provided on the fixing plate 12 to abut against the connecting plate 42. The buffer 16 preferably contacts the connecting plate 42 to remove a part of the impact kinetic energy. The buffer 16 can specifically be a spring column.

[0041] The above schematically describes the present invention and its implementation methods, which are not restrictive. The drawings show only one implementation method of the present invention, and the actual structure is not limited thereto. Therefore, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. An aluminum-plastic film heat-sealing structure, characterized in that: The tooling frame comprises a lower sealing knife, an upper sealing knife and a driving structure, the upper sealing knife is arranged above the lower sealing knife, and the driving structure controls the upper sealing knife to move up and down to cooperate with the lower sealing knife; the lower sealing knife and the upper sealing knife are both provided with oil chambers, the oil chambers are filled with silicone oil and are provided with electric heating pipes.

2. The aluminum-plastic film heat-sealing structure according to claim 1, characterized in that: A groove connected to the oil cavity is provided on a horizontal side of the lower sealing knife and the upper sealing knife, and a cavity sealing cover is connected to the groove through a cavity sealing member.

3. The aluminum-plastic film heat-sealing structure according to claim 1, characterized in that: The upper end of the lower sealing knife is provided with two oil nozzles, and the upper end of the upper sealing knife is provided with at least one oil nozzle.

4. The aluminum-plastic film heat-sealing structure according to claim 1, characterized in that: The lower sealing knife is connected to the tooling frame through a lower heat insulation plate.

5. The aluminum-plastic film heat-sealing structure according to claim 1, characterized in that: The driving structure comprises a cylinder, an output end of the cylinder is connected to a connecting plate, and the upper sealing knife is connected to the connecting plate through an upper heat insulation plate.

6. The aluminum-plastic film heat-sealing structure according to claim 5, characterized in that: The connecting plate is connected with a guide rod, and the tooling frame is provided with a guide hole matched with the guide rod.

7. The aluminum-plastic film heat-sealing structure according to claim 5, characterized in that: The tooling frame is connected to a fixing plate, the fixing plate is provided with a lower positioning piece, the connecting plate is provided with an upper positioning piece, and when the lower sealing knife and the upper sealing knife cooperate, the lower positioning piece and the upper positioning piece abut against each other.

8. The aluminum-plastic film heat-sealing structure according to claim 7, characterized in that: A first positioning slope is provided on the top of the lower positioning member, and a second positioning slope is provided on the top of the upper positioning member. The first positioning slope and the second positioning slope are abutted and matched, and a positioning adjustment structure for controlling the horizontal movement of the lower positioning member is provided on the fixing plate.

9. The aluminum-plastic film heat-sealing structure according to claim 7, characterized in that: The fixing plate is provided with a buffer member which abuts against the connecting plate.

Images