Hot melting head assembly and hot melting equipment

Abstract

The utility model discloses a hot melting head assembly and hot melting equipment, the hot melting head assembly comprises a mounting seat, a hot melting wire and a protective layer, the mounting seat is used for being mounted on a hot melting host; the thermal fuse is connected to the outer surface of the mounting seat; the protective layer is connected to the outer surface of the mounting seat and at least abuts against and covers the hot melting part of the thermal fuse, the protective layer is made of polyimide, and the surface energy of the protective layer is smaller than or equal to 20 mN / m. According to the technical scheme, the service life of the hot melting head assembly can be prolonged, the frequency of replacing the protective layer is reduced, and therefore the machining efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery processing, in particular to a hot melt head assembly and hot melt equipment. Background Art

[0002] In the field of lithium battery production, Mylar film is a polyester film that wraps the bare battery cell and insulates it from the outside world. When assembling the battery, the Mylar film that wraps the bare battery cell needs to be fixed with the retaining frame on the top cover by heat melting. This process is usually achieved by energizing the hot fuse of the hot melt head to generate a hot melting temperature of about 200°C, and then applying a certain pressure to the two to make them melt together.

[0003] However, the hot melt wire cannot directly contact the Mylar film. In order to prevent defects caused by adhesion to the molten Mylar film, the current structure will stick a layer of Teflon on the surface of the hot melt wire. Teflon has a lower surface energy, thus isolating the Mylar film from the hot melt wire. However, during the production process, Teflon needs to be frequently heated and frequently squeezed into contact with the hot melt point, which is prone to wear, blackening and other problems and failure. Therefore, Teflon must be replaced after hot melt wire drawing. Currently, the replacement frequency of Teflon is 2 hours / time, which is too high. It takes about 5 to 10 minutes to replace each time, which seriously affects the efficiency of the equipment. Utility Model Content

[0004] The main purpose of the utility model is to provide a hot melt head assembly, aiming to reduce the number of times the protective layer of the hot melt head assembly is replaced and improve processing efficiency.

[0005] To achieve the above purpose, the hot melt head assembly proposed by the utility model includes:

[0006] A mounting base, the mounting base is used to be mounted on the hot melt host;

[0007] a thermal fuse connected to an outer surface of the mounting seat; and

[0008] The protective layer is connected to the outer surface of the mounting seat and at least abuts against and covers the hot-melt portion of the hot fuse. The material of the protective layer is polyimide, and the surface energy of the protective layer is less than or equal to 20 mN / m.

[0009] The protective layer in the hot melt head assembly is made of polyimide material, and the surface energy value of the material is limited so that the surface will not adhere to the hot-melt Mylar film. The good heat resistance and wear resistance of the material are utilized to significantly extend the service life of the protective layer, and it is not prone to blackening and wear. This can greatly reduce the number of times the protective layer is replaced, improve equipment efficiency, and at the same time reduce the occurrence of wire drawing, thereby improving the yield of subsequent welding processes.

[0010] In an embodiment of the present invention, the thickness of the protective layer is less than or equal to 0.15 mm.

[0011] The thickness of this protective layer can improve the hot melt effect.

[0012] In an embodiment of the present invention, the protective layer is bonded to the outer surface of the mounting seat.

[0013] Here, the connection method of the protective layer has good connection stability.

[0014] In one embodiment of the present invention, the surface of the protective layer facing the thermal fuse includes a bonding area and a non-bonding area, the bonding area is bonded to the mounting seat, and the non-bonding area abuts and covers the hot melt portion of the thermal fuse.

[0015] Here, the provision of the protective layer can reduce the contact between the adhesive layer and the thermal fuse, thereby facilitating the replacement of the protective layer and eliminating the need to clean the thermal fuse, thereby extending its service life.

[0016] In one embodiment of the utility model, the outer surface of the mounting seat is provided with an abutment portion and two oppositely arranged mounting portions, the abutment portion is located between the two mounting portions, the two ends of the thermal fuse are respectively connected to the two mounting portions, the hot melt portion of the thermal fuse abuts against the abutment portion, and the two ends of the protective layer are connected to the opposite sides of the mounting seat in a direction perpendicular to the extension direction of the thermal fuse.

[0017] Here, the installation structure of the thermal fuse is relatively stable, and the protective layer has good protection for the thermal fuse.

[0018] In one embodiment of the present invention, the hot melt head assembly further comprises two clamping members, each of which is detachably mounted on one of the mounting portions, each of which forms a clamping space, and both ends of the hot fuse are respectively clamped and limited in the two clamping spaces.

[0019] This structure facilitates the fixing and disassembly of the thermal fuse.

[0020] In one embodiment of the utility model, the clamping member includes a first clamping portion and a second clamping portion stacked together, the clamping space is formed between the first clamping portion and the second clamping portion, the first clamping portion is provided with a first connecting hole, the second clamping portion is provided with a second connecting hole, the mounting portion is provided with a third connecting hole, and a locking member is sequentially passed through the first connecting hole and the second connecting hole and locked in the third connecting hole to clamp the thermal fuse in the clamping space.

[0021] Here, this connection method makes the connection stability of the thermal fuse good.

[0022] In one embodiment of the utility model, the mounting portion is a groove body structure opened on the surface of the mounting seat, the second clamping portion is arranged in the groove body structure, the surface of the second clamping portion is flush with the surface of the mounting seat, the first clamping portion is provided with a clamping groove on the surface facing the second clamping portion, the groove wall of the clamping groove and the surface of the second clamping portion enclose the clamping space, and the two ends of the thermal fuse are respectively pressed against the surface of the mounting seat and clamped in the clamping space.

[0023] Here, the thermal fuse is in good contact with the mounting base to avoid any gap.

[0024] In an embodiment of the present invention, the abutting portion is plate-shaped and vertically connected to a surface of the mounting seat, and the thermal fuse is extended along a side surface of the abutting portion.

[0025] The mounting seat of this structure facilitates the hot-melting pressing of the thermal fuse and reduces the bonding area between the protective layer and the mounting seat, making replacement easier.

[0026] The utility model also provides a hot melt device, comprising any of the hot melt head components described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0028] Figure 1 A schematic diagram of the structural assembly of a battery and a holder in the prior art;

[0029] Figure 2 A schematic diagram of the structural assembly of the battery and the holder wrapped with Mylar film;

[0030] Figure 3 This is a schematic structural diagram of an embodiment of a hot melt head assembly of the utility model;

[0031] Figure 4 It is an exploded view of another embodiment of the hot melt head assembly of the utility model;

[0032] Figure 5 It is a schematic diagram of the structure of the protective layer in the hot melt head assembly of the utility model.

[0033] Description of Figure Numbers:

[0034] Label name Label name 1’ Cage 30 Protective layer 1a’ Melting point 31 Bonding area 2’ Bare battery 32 Non-bonding area 3’ Mylar film 40 Clamping parts 100 Hot melt head assembly 40a Clamping space 10 Mounting Seat 41 First clamping part 11 Butt part 411 First connecting hole 12 Installation Department 412 Clamping slot 121 The third connecting hole 42 Second clamping part 20 Thermal fuse 421 Second connection hole 21 Hot melt department 50 Locking hardware

[0035] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0037] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0038] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; 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, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text is to include three parallel solutions. Taking "A and / or B as an example", it includes solution A, or solution B, or a solution that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0040] Batteries mentioned in this field can be divided into disposable batteries and rechargeable batteries according to whether they are rechargeable. Common types of rechargeable batteries currently include: lead-acid batteries, nickel-metal hydride batteries and lithium-ion batteries. Lithium-ion batteries are currently widely used in pure electric vehicles and hybrid vehicles. The capacity of lithium-ion batteries used for this purpose is relatively low, but they have larger output and charging current, and also have a longer service life, but the cost is higher.

[0041] The battery described in the embodiments of the present invention refers to a rechargeable battery. The embodiments disclosed in the present invention will be described below mainly by taking a lithium-ion battery as an example. It should be understood that the embodiments disclosed in the present invention are applicable to any other appropriate type of rechargeable battery. The battery mentioned in the embodiments disclosed in the present invention can be directly or indirectly applied to an appropriate device to power the device.

[0042] The battery mentioned in the embodiments disclosed in the present utility model refers to a single physical module including one or more battery cells to provide a predetermined voltage and capacity. The battery cell is the basic unit in the battery. The processing process of the battery cell is first to form the positive electrode plate, the negative electrode plate, the electrolyte and the isolation membrane into the form of a battery core, and then to perform shelling, welding, formation and other processes. Lithium-ion battery cells mainly rely on the movement of lithium ions between the positive electrode plate and the negative electrode plate to work. Generally, they can be divided into cylindrical battery cells, rectangular battery cells and soft-pack battery cells according to the packaging method. The following will mainly focus on the rectangular battery cell. It should be understood that the embodiments described below are also applicable to cylindrical battery cells or soft-pack battery cells in some aspects.

[0043] For rectangular battery cells, the electrode terminals are generally provided at the end caps. Multiple battery cells are connected in series and / or in parallel via the electrode terminals for various applications. In some high-power applications such as electric vehicles, the application of batteries includes three levels: battery cells, battery modules and batteries. The battery module is formed by electrically connecting a certain number of battery cells together and placing them in a frame in order to protect the battery cells from external impact, heat, vibration, etc. The battery refers to the final state of the battery system installed in the electric vehicle.

[0044] Please refer to Figure 1 and Figure 2In the manufacturing process of square lithium batteries, the bare cell 2' needs to be loaded into a hard square aluminum shell after preparation. Before loading into the aluminum shell, the cell needs to be wrapped with Mylar film 3'. Mylar film 3' (Mylar film) is a polyester film to provide better insulation and protection for the bare cell 2'. Specifically, before the bare cell 2' is softly connected to the top cover, the retaining frame 1' is first installed on the top cover, and then after the soft connection between the bare cell 2' and the top cover is completed, the Mylar film 3' is wrapped on the bottom surface and each peripheral side surface of the bare cell 2', and the upper part of the wrapped Mylar film 3' is hot-melt bonded to the hot melting point 1a' of the retaining frame 1'.

[0045] The above-mentioned hot melt bonding needs to be carried out through a hot melt device. The hot melt device presses the hot fuse 20 of the hot melt head against the Mylar film 3'. After the hot fuse 20 is passed through an electric current, the temperature rises so that the two are hot-melted and bonded. The hot melt temperature is about 200°C. The hot fuse 20 cannot directly contact the Mylar film 3', because the hot fuse 20 will adhere to the molten Mylar film 3', and when it is separated, the Mylar film 3' will be drawn, and the drawing will stick to the top cover, which will form defects in the subsequent welding process. Therefore, a layer of Teflon is currently glued on the surface of the hot fuse 20. Teflon has a lower surface energy, thereby isolating the Mylar film 3' from the hot fuse 20. However, during the production process, Teflon needs to be frequently heated and frequently squeezed and contacted with the hot melting point 1a', which is prone to wear, blackening and other problems and failure. In this way, Teflon must be replaced after hot melt drawing. At present, the frequency of Teflon replacement is 2 hours / time, and the replacement frequency is too high. It takes about 5 to 10 minutes to replace it once, which seriously affects the efficiency of the equipment.

[0046] Please refer to Figure 3 and Figure 4 In one embodiment of the present utility model, the hot melt head assembly 100 includes: a mounting seat 10, a hot fuse 20 and a protective layer 30, wherein the mounting seat 10 is used to be mounted on the hot melt host;

[0047] The thermal fuse 20 is connected to the outer surface of the mounting base 10; the protective layer 30 is connected to the outer surface of the mounting base 10 and at least abuts against and covers the hot melt portion 21 of the thermal fuse 20. The material of the protective layer 30 is polyimide, and the surface energy of the protective layer 30 is less than or equal to 20mN / m.

[0048] Under the hot melt working condition, three properties of the material need to be considered: wear resistance, temperature resistance and low surface energy. In this embodiment, the protective layer 30 of the hot melt head assembly 100 is polyimide, and its maximum use temperature can reach 450°C, which is much higher than the hot melt temperature of 200°C, so it is not easy to be carbonized during use. And according to the standard wear resistance experiment comparison, the wear resistance of polyimide is two orders of magnitude higher than that of Teflon, which makes polyimide more suitable for the hot melt working condition of Mylar film. At the same time, the surface energy of the protective layer 30 is limited to be less than or equal to 20mN / m, for example, 16mN / m, 18mN / m, 19mN / m, etc., so that it will not adhere to the molten Mylar film. Because the surface energy of conventional polyimide is higher than this value, it needs to be processed before use, or a qualified polyimide material that has been processed on the market can be directly selected. The process treatment here is to reduce the surface energy of polyimide. For example, the surface tension can be reduced by coating treatment to achieve the purpose of reducing the surface energy. Of course, other methods of soaking in solutions may also be used to perform surface energy reduction treatment, which is not limited here and can be selected according to actual needs.

[0049] The mounting seat 10 is used to mount the hot fuse 20 on the driving device, so that it can be pressed and hot-melted close to the Mylar film under the drive of the driving device. The shape of the mounting seat 10 is not limited, and can be square, polygonal or irregular. The material of the mounting seat 10 can be selected as synthetic stone, for example, by adding a small amount of polyester and adhesive to natural stone powder, mixing and pressurizing under vacuum, and vibrating to form. The synthetic stone continues to maintain its physical properties in an environment where the temperature gradually increases, so that it will not deform during the hot melting process, thereby extending the service life of the hot melt head assembly 100. Of course, in other examples, other materials can also be selected, such as ceramics. The material of the hot fuse 20 can be selected as a metal material, such as a nickel-chromium alloy or other alloy, which can heat up and generate heat after being powered on. The connection method of the hot fuse 20 on the mounting seat 10 can be a detachable connection, such as a clamping or threaded fit, or it can be bonding, which is not limited here. The connection method of the protective layer 30 on the mounting seat 10 is a detachable connection, a crimping or a clamping, or a peelable adhesive, which is not limited here.

[0050] The protective layer 30 in the hot melt head assembly 100 is made of polyimide material, and the surface energy value of the material is limited so that the surface will not adhere to the hot-melt Mylar film. The good heat resistance and wear resistance of the material are utilized to significantly extend the service life of the protective layer 30, and it is not prone to blackening and wear. This can greatly reduce the number of times the protective layer 30 needs to be replaced, improve equipment efficiency, and at the same time reduce the occurrence of wire drawing, thereby improving the yield of subsequent welding processes.

[0051] In an embodiment of the present invention, the thickness of the protective layer 30 is less than or equal to 0.15 mm.

[0052] In this embodiment, the thickness of the protective layer 30 is set to be less than or equal to 0.15 mm. For example, the thickness can be 0.15 mm, 0.125 mm, 0.12 mm, 0.1 mm or 0.075 mm. The thickness of the protective layer 30 can meet the structural strength and toughness, and can also make the distance between the hot fuse 20 and the Mylar film appropriate, thereby improving the hot melt effect.

[0053] In an embodiment of the present invention, the protective layer 30 is bonded to the outer surface of the mounting base 10 .

[0054] Here, the protective layer 30 can be bonded to the outer surface of the mounting base 10 by double-sided adhesive, and this connection method has good connection stability and is convenient for replacement. In other examples, the protective layer 30 can also be bonded and fixed by organic silicone or hot melt adhesive.

[0055] Please refer to Figure 5 In one embodiment of the utility model, the surface of the protective layer 30 facing the thermal fuse 20 includes a bonding area 31 and a non-bonding area 32, the bonding area 31 is bonded to the mounting seat 10, and the non-bonding area 32 abuts against and covers the hot melt portion 21 of the thermal fuse 20.

[0056] Here, the protective layer 30 is coated with colloid at the position where it is connected to the mounting seat 10 to form a bonding area 31, and no colloid is provided at the position corresponding to the hot melt portion 21 of the hot fuse 20, thereby forming a non-bonding area 32. Such a setting can reduce the contact between the adhesive layer and the hot fuse 20, so that when replacing the protective layer 30, there is no need to manually clean the hot fuse 20, which will not affect the hot fuse 20, thereby improving the replacement efficiency and extending the service life of the hot fuse 20. Optionally, the part that neither corresponds to the hot melt portion 21 nor fits the mounting seat 10 can be provided with an adhesive layer or not, which is not limited here.

[0057] Please refer to Figure 4 In one embodiment of the utility model, the outer surface of the mounting seat 10 is provided with an abutting portion 11 and two mounting portions 12 arranged opposite to each other, the abutting portion 11 is located between the two mounting portions 12, the two ends of the thermal fuse 20 are respectively connected to the two mounting portions 12, the hot melt portion 21 of the thermal fuse 20 abuts against the abutting portion 11, and the two ends of the protective layer 30 are connected to the opposite sides of the mounting seat 10 in a direction perpendicular to the extension direction of the thermal fuse 20.

[0058] Here, in order to facilitate the fixing of the thermal fuse 20, its two ends are fixed on the two mounting parts 12, and the hot melt part 21 in the middle is fixed on the abutting part 11, so that it is more convenient for the thermal fuse 20 to press against the hot melting point 1a', so as not to affect the connection position. At the same time, the setting of this structure can also make the installation structure of the thermal fuse 20 more stable, and the hot melt part 21 and the mounting seat 10 fit better, avoiding the situation where the hot melt part 21 is separated from the mounting seat 10 and excessive hot melting of the Mylar film is generated. The protective layer 30 is connected to the mounting seat 10 in a direction perpendicular to the extension direction of the thermal fuse 20, so that the ductility of the protective layer 30 is better, thereby further reducing the probability of adhesion to the Mylar film, and will not affect the connection and fixing position of the thermal fuse 20, and has good protection for the thermal fuse 20.

[0059] Please continue to refer to Figure 4 In one embodiment of the present invention, the hot melt head assembly 100 also includes two clamping members 40, each of which is detachably mounted on one of the mounting portions 12, and each of the clamping members 40 forms a clamping space 40a, and the two ends of the hot fuse 20 are respectively clamped and limited in the two clamping spaces 40a.

[0060] Here, the two clamping members 40 clamp the two ends of the thermal fuse 20 respectively, wherein the clamping member 40 can be movably arranged so that the thermal fuse 20 can be directly pressed to be opened and clamped, or it can be a fixed structure, which is locked and clamped by a locking structure, which is not limited here. The clamping connection structure can improve the fixing stability of the thermal fuse 20. At the same time, the clamping member 40 can be detachably installed on the mounting portion 12, for example, by snap connection or threaded connection, so that the thermal fuse 20 can be easily replaced.

[0061] In one embodiment of the utility model, the clamping member 40 includes a first clamping portion 41 and a second clamping portion 42 stacked together, and the clamping space 40a is formed between the first clamping portion 41 and the second clamping portion 42. The first clamping portion 41 is provided with a first connecting hole 411, and the second clamping portion 42 is provided with a second connecting hole 421. The mounting portion 12 is provided with a third connecting hole 121. A locking member 50 is sequentially passed through the first connecting hole 411 and the second connecting hole 421 and is locked in the third connecting hole 121 to clamp the thermal fuse 20 in the clamping space 40a.

[0062] Here, a threaded connection method is selected to simultaneously fix the clamp 40 and clamp the two ends of the thermal fuse 20. This connection method makes the connection stability of the thermal fuse 20 good and saves more assembly steps. In one example, each clamp 40 is installed at the position of the mounting portion 12 through two or more locking members 50, and correspondingly, two or more first connection holes 411, second connection holes 421 and third connection holes 121 are set, thereby further improving the structural stability. The first clamp 41 and the second clamp 42 are both made of copper, so that the thermal fuse 20 and the wire can be clamped and turned on together to achieve the passage of current.

[0063] Please refer to Figure 4 In one embodiment of the utility model, the mounting portion 12 is a groove structure opened on the surface of the mounting seat 10, the second clamping portion 42 is arranged in the groove structure, the surface of the second clamping portion 42 is flush with the surface of the mounting seat 10, and the first clamping portion 41 is provided with a clamping groove 412 on the surface facing the second clamping portion 42, the groove wall of the clamping groove 412 and the surface of the second clamping portion 42 enclose the clamping space 40a, and the two ends of the thermal fuse 20 are respectively pressed against the surface of the mounting seat 10 and clamped in the clamping space 40a.

[0064] Here, the mounting portion 12 is a slot structure, and the first clamping portion 41 and the second clamping portion 42 have the same shape and are both adapted to the opening shape and size of the slot structure. During assembly, the second clamping portion 42 can be limited within the slot structure, and the surface of the second clamping portion 42 is flush with the surface of the mounting seat 10, so that when the thermal fuse 20 is clamped, the thermal fuse 20 can always be in contact with the outer surface of the mounting seat 10, so that the thermal fuse 20 is in good contact with the mounting seat 10, avoiding the occurrence of gaps, and especially during the hot melt process, the deformation of the thermal fuse 20 can also be reduced.

[0065] In an embodiment of the present invention, the abutting portion 11 is plate-shaped and vertically connected to a surface of the mounting seat 10 , and the thermal fuse 20 is extended along a side surface of the abutting portion 11 .

[0066] In one example, the abutment portion 11 and the mounting seat 10 are an integral structure, thereby improving the connection strength and stability, and improving the performance of the hot melt head assembly 100. The abutment portion 11 is vertically arranged in the middle of a surface of the mounting seat 10, and the surface is between the two surfaces provided with the mounting portion 12, so that the hot fuse 20 extends along the side of the abutment portion 11 to the mounting portions 12 on both sides. After the protective layer 30 is assembled, there may be an un-abutted portion between the connection position and the position abutting the hot melt portion 21, so that the protective layer 30 can be further stretched. The mounting seat 10 of this structure facilitates the hot melt pressing of the hot fuse 20, and reduces the bonding area between the protective layer 30 and the mounting seat 10, which is convenient for replacement.

[0067] The utility model also provides a hot melt device (not shown), including any of the hot melt head components 100 described above. The hot melt device adopts all the technical solutions of all the above embodiments, and thus has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0068] The above description is only a preferred embodiment of the utility model, and does not limit the patent scope of the utility model. All equivalent structural changes made by using the contents of the utility model specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the utility model.

Claims

1. A hot melt head assembly, characterized in that: include: A mounting base, the mounting base is used to be mounted on the hot melt host; A thermal fuse connected to an outer surface of the mounting seat; as well as The protective layer is connected to the outer surface of the mounting seat and at least abuts against and covers the hot-melt portion of the hot fuse. The material of the protective layer is polyimide, and the surface energy of the protective layer is less than or equal to 20 mN / m.

2. The hot melt head assembly according to claim 1, characterized in that: The thickness of the protective layer is less than or equal to 0.15 mm.

3. The hot melt head assembly according to claim 1 or 2, characterized in that: The protective layer is bonded to the outer surface of the mounting seat.

4. The hot melt head assembly according to claim 3, characterized in that: The surface of the protection layer facing the thermal fuse includes a bonding area and a non-bonding area, the bonding area is bonded to the mounting seat, and the non-bonding area abuts against and covers the hot-melt portion of the thermal fuse.

5. The hot melt head assembly according to any one of claims 1 to 4, characterized in that: The outer surface of the mounting seat is provided with an abutment portion and two mounting portions arranged opposite to each other, the abutment portion is located between the two mounting portions, the two ends of the thermal fuse are respectively connected to the two mounting portions, the hot melt portion of the thermal fuse abuts against the abutment portion, and the two ends of the protective layer are connected to the opposite sides of the mounting seat in a direction perpendicular to the extension direction of the thermal fuse.

6. The hot melt head assembly according to claim 5, characterized in that: The hot melt head assembly also includes two clamping members, each of which is installed on one of the installation parts, and each of the clamping members forms a clamping space, and the two ends of the hot fuse are respectively clamped and limited in the two clamping spaces.

7. The hot melt head assembly according to claim 6, characterized in that: The clamping member includes a first clamping portion and a second clamping portion stacked together, a clamping space is formed between the first clamping portion and the second clamping portion, a first connecting hole is formed in the first clamping portion, a second connecting hole is formed in the second clamping portion, and a third connecting hole is formed in the mounting portion. A locking member is sequentially passed through the first connecting hole and the second connecting hole and is locked in the third connecting hole to clamp the thermal fuse in the clamping space.

8. The hot melt head assembly according to claim 7, characterized in that: The mounting portion is a groove structure opened on the surface of the mounting seat, the second clamping portion is arranged in the groove structure, the surface of the second clamping portion is flush with the surface of the mounting seat, the first clamping portion is provided with a clamping groove on the surface facing the second clamping portion, the groove wall of the clamping groove and the surface of the second clamping portion enclose the clamping space, and the two ends of the thermal fuse are respectively pressed against the surface of the mounting seat and clamped in the clamping space.

9. The hot melt head assembly according to any one of claims 5 to 8, characterized in that: The abutting portion is plate-shaped and vertically connected to a surface of the mounting seat, and the thermal fuse is extended along the side surface of the abutting portion.

10. A hot melt device, characterized in that: The invention comprises the hot melt head assembly as claimed in any one of claims 1 to 9.

Images