Heat shrink film heating mechanism

Abstract

The present invention provides a heat shrink film heating mechanism for use in the heat shrink process of a battery, comprising: a conveying device, a rotating base, a liquid storage member and a resistance member. The rotating base is rotatably arranged on the conveying device, and the top is used to arrange the battery. The liquid storage member has an inner cavity for storing a heat-generating medium, and the liquid storage member is arranged above the conveying device, and a slot is provided at the bottom for the battery to pass through. The resistance member is arranged on one side of the moving track of the rotating base, and is configured such that when the rotating base moves to the position of the slot, the resistance member can contact the edge of the rotating base to rotate the rotating base. The heat shrink film heating mechanism of the present invention greatly improves the heating effect of the heat shrink process of the battery, improves the quality and strength of the finished film sleeve, avoids wrinkles or cracks in the film sleeve, and effectively prevents the appearance of the battery product from being affected by the heat shrinkage problem of the film sleeve.

Description

Technical Field

[0001] The invention relates to the technical field of secondary battery manufacturing, and in particular to a heat shrink film heating mechanism. Background Art

[0002] During the production process of batteries, a heat shrink film is put on the outside of the battery and heat-shrunk and fastened so that the heat shrink film can be tightly combined with the bare battery. In the prior art, electric heating and air cooling are usually used to make the heat shrink film shrink when it encounters heat, so that it can be tightly wrapped around the outside of the battery. In actual production, due to the uneven heating surface of electric heating and air cooling, the battery is heated unevenly during the heat shrink process, which ultimately leads to poor heat shrinkage effect of the heat shrink film, poor quality of the finished film sleeve, low strength, and easy wrinkles or cracks in the film sleeve, affecting the appearance of the battery product. Summary of the invention

[0003] In order to solve the technical problem of uneven heating of the heating mechanism in the heat shrinking process of the battery in the prior art, the technical solution of the present invention is as follows:

[0004] The present invention provides a heat shrink film heating mechanism, which is used in the heat shrink process of the battery. The heat shrink film heating mechanism includes: a conveyor, a rotating base, a liquid storage member and a resistance member. Among them, the conveyor is a conveyor belt, a roller conveyor belt, a track conveyor belt, etc. in the prior art. The rotating base is rotatably arranged on the conveyor, and the top is used to set the battery. The liquid storage member has an inner cavity for storing a heat-generating medium. The liquid storage member is arranged above the conveyor, and a slot for the battery to pass through is opened at the bottom. Along the transmission direction of the conveyor, the slot passes through both ends of the liquid storage member. The slot wall of the slot is a heat-conducting slot wall, and the slot is separated from the inner cavity. The resistance member is arranged on one side of the moving track of the rotating base, and is configured as follows: when the rotating base moves to the position of the slot, the resistance member can contact the edge of the rotating base to rotate the rotating base.

[0005] The working principle of the heat shrink film heating mechanism in the present invention is as follows: before working, first start the circulating heating device to heat the heat medium, and after the temperature reaches the preset temperature value (150℃-200℃) and stabilizes, pump the heat medium into the liquid storage part from the liquid inlet for use as a heat source; then start the conveying device, and the conveying device conveys the rotating base together with the battery after the film is coated into the slot. At this time, the rotating base moves forward under the action of the conveying device, and rotates under the backward resistance of the resistance member. The rotating base synchronously drives the battery to rotate. The battery rotates in the slot while being heated by the heat medium. The heat shrink film outside the battery is heated evenly, achieving a shrink film effect; when the temperature of the heat medium is lower than the preset temperature value, the circulating heating device pumps the heat medium in the liquid storage part out of the liquid outlet, and pumps in new high-temperature heat medium, so that the heat medium in the liquid storage part is in a constant temperature state.

[0006] The heat shrink film heating mechanism in the present invention uses a liquid heating medium as a heat source, so that the three surfaces in the slot are all heating surfaces and there is no heating blind area, so the generated heat radiation can evenly cover the heat shrink film of the battery. At the same time, the battery rotates under the drive of the rotating base, so that the thermoplastic film of the battery is exposed to the coverage of the heat radiation without dead angles, further improving the uniformity of the heating of the thermoplastic film. The heat shrink film heating mechanism in the present invention greatly improves the heating effect of the battery heat shrink process, improves the quality and strength of the finished film, avoids the appearance of the film, and effectively prevents the appearance of the battery product from being affected by the film heat shrinkage problem.

[0007] In a possible design, a magnetic member is disposed on the top of the rotating base, and the magnetic member is used to be magnetically connected to the battery.

[0008] In a possible design, a bonding portion is provided on the top of the rotating base, and the bonding portion is used to bond with the battery.

[0009] In a possible design, a bearing and a connecting plate are provided at the bottom of the rotating base, the rotating base is rotatably connected to the connecting plate via the bearing, and the connecting plate is fixedly connected to the conveying device.

[0010] In a possible design, the resistance member is a rack, a gear is coaxially arranged on the rotating base, and the rack is configured such that when the rotating base moves to the position of the slot, the rack can mesh with the gear to rotate the rotating base.

[0011] In a possible design, the resistance member is a rubber sheet, and the rubber sheet is configured such that when the rotating base moves to the position of the slot, the rubber sheet abuts against the rotating base to make the rotating base rotate.

[0012] In a possible design, the outside of the resistance element is covered with a support plate.

[0013] In a possible design, the heat shrink film heating mechanism further includes: a smooth support member, which is arranged in parallel on the opposite side of the resistance member and abuts against the rotating base.

[0014] In a possible design, the heat shrink film heating mechanism also includes: a circulating heating device, the liquid storage component is provided with a liquid inlet and a liquid outlet communicated with the inner cavity, and the circulating heating device is connected to the liquid inlet and the liquid outlet through a pipeline.

[0015] In a possible design, the heat-generating medium is heat-conducting oil.

[0016] In a possible design, the difference between the width of the slot and the outer diameter of the battery is 7-8 cm. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of a heat shrink film heating mechanism provided by an embodiment of the present invention;

[0018] Figure 2 yes Figure 1 Schematic diagram from another perspective;

[0019] Figure 3 is an exploded diagram of a heat shrink film heating mechanism provided by an embodiment of the present invention;

[0020] Figure 4 yes Figure 3 Schematic diagram from another perspective;

[0021] Figure 5 It is a schematic diagram of a heat shrink film heating mechanism provided in another embodiment of the present invention.

[0022] Figure numerals: 10, liquid storage part; 11, liquid inlet; 12, liquid outlet; 13, slot; 20, rotating base; 21, magnetic suction part; 22, mounting slot; 23, bearing; 24, connecting plate; 30, resistance part; 31, support plate; 32, mounting plate; 33, bolt; 40, battery; 50, smooth support part. DETAILED DESCRIPTION

[0023] The technical solution of the present invention will be described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0024] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "side", "inside", "outside", "top", "bottom", etc. indicate orientations or positional relationships based on the installation, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0026] It should also be noted that in the embodiments of the present invention, the same figure mark is used to represent the same component or the same part. For the same parts in the embodiments of the present invention, the figure may only mark the figure with one of the parts or components as an example. It should be understood that the figure mark is also applicable to other identical parts or components.

[0027] In the following, the terms "first", "second", etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the features.

[0028] like Figure 1-2As shown, this embodiment provides a heat shrink film heating mechanism, which is used in the heat shrink process of the battery 40. The heat shrink film heating mechanism includes: a conveyor, a rotating base 20, a liquid storage member 10 and a resistance member 30. The conveyor is an existing device, which is used to connect various processes in series, and can be a conveyor belt, a roller conveyor belt, a track conveyor belt, etc. in the prior art. The liquid storage component 10 is a hollow structure having an inner cavity filled with a heating medium as a heat source. The liquid storage component 10 is provided with a liquid inlet 11 and a liquid outlet 12 connected to the inner cavity. The liquid inlet 11 and the liquid outlet 12 are connected to an external circulation heating device through pipelines, wherein the circulation heating device is an existing device, which includes a heating tank, a circulation pump, a heater and other components. The heating medium is heated by the heater in the heating tank and is sent in or out by the circulation pump. The liquid storage component 10 is arranged above the conveying device, and a through groove 13 for the battery 40 to pass through is provided at the bottom. Along the transmission direction of the conveying device, the through groove 13 runs through both ends of the liquid storage component 10, and the groove wall of the through groove 13 is a heat-conducting groove wall, and separates the through groove 13 from the inner cavity, wherein the heat-conducting groove wall is made of stainless steel material with excellent thermal conductivity. The heat generated by the heating medium passes through the heat-conducting groove wall to heat the battery 40 located in the through groove 13. The rotating base 20 has a top that is detachably connected to the battery 40, and a bottom that is rotatably connected to an external conveying device. Before the heat shrinking process of the present invention, there is a film covering process for the battery 40. The conveying device will be covered with a heat shrink film and then sent to the heat shrinking process. After the heat shrinking is completed, it will be sent to the packaging process. Therefore, the battery 40 and the rotating base 20 must be detachably connected to facilitate unloading operations during the packaging process. In addition, the rotating base 20 is rotatably connected to the conveying device, and its purpose is to drive the battery 40 to rotate by the rotating base 20 during heating. The resistance member 30 is arranged parallel to one side of the slot 13, and after being connected to the rotating base 20, provides resistance in the opposite direction of the running track of the conveying device, that is, the resistance member 30 can provide torque for the rotating base 20, so that the rotating base 20 rotates when passing through the resistance member 30, wherein the rotating base 20 moves in a motion similar to a movable pulley (a pulley whose shaft moves with the object is called a movable pulley), that is, the rotating base 20 moves forward with the conveying device, and the resistance member 30 applies a backward resistance to the rotating base 20 to make it rotate. The conveying device transports the rotating base 20 and the battery 40 through the slot 13 in sequence, and the battery 40 rotates driven by the rotating base 20 and is evenly heated by the heat medium in the slot 13.

[0029] The working principle of the heat shrink film heating mechanism in this embodiment is as follows: before operation, the circulating heating device is first started to heat the heat medium. After the temperature reaches the preset temperature value (150°C-200°C) and stabilizes, the heat medium is pumped into the inner cavity of the liquid storage member 10 from the liquid inlet 11 for use as a heat source; then the conveying device is started, and the conveying device conveys the rotating base 20 together with the film-coated battery 40 into the slot 13. At this time, the rotating base 20 moves forward under the action of the conveying device, and is simultaneously pushed backward by the resistance member 30. The rotating base 20 rotates under the action of resistance, and the rotating base 20 drives the battery 40 to rotate synchronously. The battery 40 rotates in the slot 13 while being heated by the heating medium. The heat shrink film outside the battery 40 is heated evenly, achieving a shrink film effect. While the heat shrink process is continuing, when the temperature of the heating medium is lower than the preset temperature value, the circulating heating device pumps the heating medium in the liquid storage part 10 out of the liquid outlet 12, and pumps in new high-temperature heating medium, so that the heating medium in the liquid storage part 10 is in a constant temperature state, and the battery 40 is continuously heated. The heat shrink film heating mechanism in this embodiment uses a liquid heating medium as a heat source, so that the three surfaces in the slot 13 are all heating surfaces and there is no heating blind area, so the generated heat radiation can be evenly covered on the heat shrink film of the battery 40. At the same time, the battery 40 rotates under the drive of the rotating base 20, so that the thermoplastic film of the battery 40 is exposed to the coverage range of the heat radiation without dead angles, further improving the heating uniformity of the thermoplastic film. The heat shrink film heating mechanism in this embodiment greatly improves the heating effect of the heat shrink process of the battery 40, improves the quality and strength of the finished film, avoids wrinkles or cracks in the film, and effectively prevents the appearance of the battery 40 product from being affected by the film heat shrinkage problem.

[0030] When the top of the rotating base 20 is detachably connected to the battery 40, it should be noted that the rotating base 20 or the connecting structure should avoid covering or blocking the heat shrink film of the battery 40 to avoid affecting the heating surface of the heat shrink film and preventing the formation of a heating blind area at the covered or blocked area, thereby resulting in poor heat shrinking effect. Figure 3 As shown, in one embodiment, the top of the rotating base 20 is detachably connected to the battery 40 through magnetic attraction; the top of the rotating base 20 is provided with a mounting slot 22 for mounting the magnetic attraction member 21. The magnetic attraction member 21 is a strong magnet to ensure the circumferential fixing strength of the rotating base 20 and the battery 40, so that they can rotate synchronously. The rotating base 20 is detachably connected to the battery 40 to facilitate the unloading operation in the packaging process stage.

[0031] In one embodiment, the top of the rotating base 20 may be coated with adhesive, and the battery 40 may be bonded by the adhesive, and a detachable connection may be realized. The battery 40 may be separated from the rotating base 20 by cutting during the packaging process, thereby realizing the unloading operation. The adhesive is selected to be resistant to high temperatures of 300° C. to avoid failure of the adhesive force after being melted in the slot 13.

[0032] like Figure 4 As shown, in one embodiment, the specific implementation method of the bottom of the rotating base 20 being rotatably connected to the external transmission device is as follows: a bearing 23 and a connecting plate 24 are provided at the bottom of the rotating base 20, and the rotating base 20 is rotatably connected to the connecting plate 24 through the bearing 23, and the connecting plate 24 is fixedly connected to the transmission device. The rotating base 20 is not directly connected to the transmission device, but is connected through the connecting plate 24. The connecting plate 24 can increase the connection area between the rotating base 20 and the transmission device, thereby improving the connection strength between the two. Among them, the outer ring of the bearing 23 is fixed to the groove provided at the bottom of the rotating base 20, and the inner ring of the bearing 23 is fixed to the protrusion on the connecting plate 24.

[0033] After the resistance member 30 is connected to the rotating base 20, it provides resistance in the opposite direction of the running track of the conveyor, so that the rotating base 20 rotates when passing through the resistance member 30. The function is specifically implemented in the following way: the resistance member 30 is a rack, and the rotating base 20 is provided with gear teeth meshing with the rack, and the rotating base 20 meshes with the resistance member 30. This structure is matched by the rack and the gear teeth. When the conveyor drives the rotating base 20 to move forward, the rack resists the meshing part of the rotating base 20 backward to provide torque, forcing the rotating base 20 to rotate.

[0034] The resistance member 30 causes the rotating base 20 to rotate when passing through the resistance member 30. Figure 1-4 As shown, in one embodiment, the function can be specifically implemented as follows: the resistance member 30 is a rubber sheet, the rotating base 20 abuts against the resistance member 30, the rubber sheet provides friction resistance, and when the conveying device drives the rotating base 20 to move forward, the rotating base 20 can be forced to rotate.

[0035] In order to increase the friction resistance of the rubber sheet to the rotating base 20, the outer peripheral wall of the rotating base 20 is roughened. In one embodiment, the outer peripheral wall of the rotating base 20 has convex points, grooves or convex ridges.

[0036] When the resistance member 30 is a rubber sheet, in order to ensure that the rubber sheet has a large friction resistance to the rotating base 20, the rubber sheet needs to be closely attached to the rotating base 20, and even the rubber sheet needs to be deformed. Therefore, the rubber sheet needs to be reinforced, such as Figure 3-4As shown, in one embodiment, the resistance member 30 is covered with a support plate 31, wherein the cross-sectional shape of the support plate 31 is a U-shaped with a side opening, and the opening is used for the rubber sheet to abut against the rotating base 20. The outer side of the support plate 31 is reinforced by a mounting plate 32 and bolts 33 and assembled into the station.

[0037] like Figure 5 As shown, when the resistance member 30 is a rubber sheet, in order to ensure that the rubber sheet has a large friction resistance to the rotating base 20 to force it to rotate, the abutment force of the rubber sheet on the rotating base 20 should be large. At this time, the rotating base 20 and the bearing 23 will be subjected to excessive radial force, causing the rotating base 20 to deflect to the side away from the rubber sheet. The occurrence of this situation may cause two consequences: first, the bearing 23 will be damaged by the radial force for a long time; second, when the rotating base 20 carries the battery 40 in the slot 13, the battery 40 will deflect to one side of the slot wall, which may cause uneven heating. In order to avoid the above two consequences, a smooth support member 50 is arranged on the opposite side of the rubber sheet to provide a reverse support force for the rotating base 20 to prevent the rotating base 20 from deflecting to the side. At the same time, the smooth support member 50 should be made of a material with a low friction coefficient, such as tempered glass, hard resin, stainless steel, etc., with a certain strength and a low friction coefficient. When the rotating base 20 rotates on the surface of the smooth support member 50, it will not be subjected to excessive resistance.

[0038] In one embodiment, the above-mentioned circulating heating device can also be replaced by a heating rod. A heating rod is arranged in the inner cavity of the liquid storage component 10 to heat the heat transfer oil. In this case, the liquid storage component 10 does not need to have a liquid inlet 11 and a liquid outlet 12.

[0039] In one embodiment, the heat-generating medium is heat-conducting oil. Technical parameters: The heat-conducting oil can be LQD-350, wherein LQD350 heat-conducting oil is compounded by secondary hydrogenation national standard deep refined base oil and high temperature resistant additives, and has excellent high temperature thermal stability and extremely strong oxidation stability. In the present invention, it can meet the heating temperature requirement of 150°C-200°C, and the temperature change fluctuation is small, and the shrinkage effect is significantly improved. The heat-conducting oil can also be selected from: alkylbenzene type (benzene ring type) heat-conducting oil, alkylnaphthalene type heat-conducting oil, alkylbiphenyl type heat-conducting oil, biphenyl and diphenyl ether low-melting mixture type heat-conducting oil, alkylbiphenyl ether type heat-conducting oil.

[0040] In one embodiment, the difference between the width of the slot 13 and the outer diameter of the battery 40 is 7-8 cm. It has been verified that when the rotating battery 40 passes through the slot 13, the heating effect is best when the left and right sides are 3 cm away from the slot wall, that is, the slot wall of the slot 13 is designed to be 3 cm away from the left and right sides of the battery 40.

[0041] In one embodiment, the liquid storage component 10 is mainly made of stainless steel and is wrapped with thermal insulation cotton to prevent accidental burns.

[0042] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A heat shrink film heating mechanism, used in a heat shrink process of a battery (40), characterized in that: include: Conveyor device; A rotating base (20) is rotatably disposed on the conveying device, and the top is used to place the battery (40); A liquid storage component (10) having an inner cavity for storing heat transfer oil, the liquid storage component (10) being arranged above the conveying device, and having a through slot (13) at the bottom for the battery (40) to pass through, the through slot (13) passing through both ends of the liquid storage component (10) along the transmission direction of the conveying device, the slot wall of the through slot (13) being a heat transfer slot wall, and separating the through slot (13) from the inner cavity; The resistance member (30) is arranged on one side of the moving track of the rotating base (20), and is configured such that when the rotating base (20) moves to the position of the slot (13), the resistance member (30) can contact the edge of the rotating base (20), and the rotating base (20) moves forward under the action of the conveying device, and rotates under the backward resistance of the resistance member (30).

2. The heat shrink film heating mechanism according to claim 1, characterized in that: A magnetic attraction component (21) is arranged on the top of the rotating base (20), and the magnetic attraction component (21) is used for magnetically connecting with the battery (40).

3. The heat shrink film heating mechanism according to claim 1, characterized in that: A bonding portion is provided on the top of the rotating base (20), and the bonding portion is used to bond with the battery (40).

4. The heat shrink film heating mechanism according to claim 1, characterized in that: A bearing (23) and a connecting plate (24) are arranged at the bottom of the rotating base (20); the rotating base (20) is rotatably connected to the connecting plate (24) via the bearing (23); and the connecting plate (24) is fixedly connected to the conveying device.

5. The heat shrink film heating mechanism according to claim 1, characterized in that: The resistance member (30) is a rack, and a gear is coaxially arranged on the rotating base (20). The rack is configured such that when the rotating base (20) moves to the position of the slot (13), the rack can mesh with the gear to rotate the rotating base (20).

6. The heat shrink film heating mechanism according to claim 1, characterized in that: The resistance member (30) is a rubber sheet, and the rubber sheet is configured such that when the rotating base (20) moves to the position of the slot (13), the rubber sheet abuts against the rotating base (20) to enable the rotating base (20) to rotate.

7. The heat shrink film heating mechanism according to claim 6, characterized in that: The outside of the resistance member (30) is covered with a support plate (31).

8. The heat shrink film heating mechanism according to claim 6, characterized in that: Also includes: A smooth support member (50) is arranged in parallel on the opposite side of the resistance member (30) and abuts against the rotating base (20).

9. The heat shrink film heating mechanism according to claim 1, characterized in that: Also includes: A circulating heating device, wherein the liquid storage element (10) is provided with a liquid inlet (11) and a liquid outlet (12) which are communicated with the inner cavity, and the circulating heating device is connected to the liquid inlet (11) and the liquid outlet (12) via a pipeline.

10. The heat shrink film heating mechanism according to claim 1, characterized in that: The difference between the width of the groove (13) and the outer diameter of the battery (40) is 7-8 cm.

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