A temperature fuse and tape, board, protection device

Abstract

The utility model relates to temperature fuse technical field especially relates to a temperature fuse and carrier tape, on -board, protection device. Temperature fuse includes: first electrode, second electrode, temperature sensing alloy and casing, the inside formation of casing has accommodation space, first electrode and second electrode all have opposite first end and second end, first electrode's first end and second electrode's first end opposite interval arrangement in accommodation space, temperature sensing alloy is located in accommodation space, and respectively with first electrode's first end, second electrode's first end electric contact, casing is located respectively and is set up with through -hole at first electrode's first end and second electrode's first end. Through above -mentioned setting, not only be favorable to improve the welding quality while reducing product size, still effectively improved the stability and performance of product.

Description

Technical Field

[0001] This utility model relates to the field of temperature fuse technology, and in particular to a temperature fuse, carrier tape, plate-mounted, and protective device. Background Technology

[0002] A thermal fuse is an over-temperature protection component, typically used as secondary protection to ensure timely tripping when exposed to over-temperature risks, thus protecting the circuit. Alloy thermal fuses, in particular, have become widely used in recent years due to their non-resettable tripping action, high operating temperature accuracy, and high reliability. Conventional alloy thermal fuses contain a built-in temperature-sensing alloy. When external temperature transfers heat to the sensing alloy and reaches its melting point, the alloy rapidly contracts towards the electrodes with the aid of the surface tension of the flux, thus breaking the circuit.

[0003] When welding the sensing alloy and electrode in traditional alloy-type thermal fuses, welding is generally performed from the side closest to the front of the sensing alloy. This can easily lead to poor welding quality and risks to product operation. Utility Model Content

[0004] This utility model provides a temperature fuse and carrier tape, plate-mounted, and protective device, which can solve at least one problem in the background art to improve the welding quality and stability of the temperature fuse, thereby effectively improving product performance.

[0005] In a first aspect, this utility model provides a temperature fuse, comprising: a first electrode, a second electrode, a temperature-sensitive alloy, and a housing; an accommodating space is formed inside the housing; the first electrode and the second electrode each have a first end and a second end opposite to each other; the first end of the first electrode and the first end of the second electrode are disposed opposite to each other in the accommodating space; the temperature-sensitive alloy is located in the accommodating space and is in electrical contact with the first end of the first electrode and the first end of the second electrode, respectively; the housing has through holes at the first end of the first electrode and the first end of the second electrode, respectively.

[0006] In some embodiments, the housing includes a bottom shell portion and a side shell portion extending upward from the bottom shell portion, the bottom shell portion and the side shell portion together forming the accommodating space having an opening; the first electrode and the second electrode are located between the bottom shell portion and the side shell portion; the through hole is formed on the bottom shell portion.

[0007] In some embodiments, the first electrode has a protrusion protruding horizontally to the side edge at its first end, and the housing has a groove corresponding to the protrusion at the first end of the first electrode, so that the first electrode is fastened to the housing by the protrusion engaging with the groove; and / or, the first electrode has a notch recessed inward to the first end edge at its first end, and the housing has a flange corresponding to the notch at the first end of the first electrode, so that the first electrode is fastened to the housing by the notch engaging with the flange.

[0008] And / or, the first end side edge of the second electrode is provided with a protrusion that protrudes horizontally to the side, and the housing is provided with a groove corresponding to the protrusion position at the first end of the second electrode, so that the second electrode is fastened to the housing by the engagement of the protrusion and the groove; and / or, the first end side edge of the second electrode is provided with a notch that is recessed to the inside of the first end, and the housing is provided with a flange corresponding to the notch position at the first end of the second electrode, so that the second electrode is fastened to the housing by the engagement of the notch and the flange.

[0009] In some embodiments, the first electrode and the second electrode are provided with through slots.

[0010] In some embodiments, the housing is integrally formed with the first electrode and the second electrode.

[0011] In some embodiments, an encapsulation structure is also included; the encapsulation structure includes a thermosetting resin or a photocurable resin or a cover plate or a film, the thermosetting resin or photocurable resin filling the accommodating space for encapsulation; the cover plate or film encapsulates the accommodating space by ultrasonic welding or laser welding or hot pressing or bonding or is bonded to the housing by thermosetting resin or photocurable resin.

[0012] Secondly, this utility model also provides a carrier tape, including a plurality of temperature fuses as described in any of the above embodiments, wherein the temperature fuses are spaced apart and arranged side by side, and the second ends of the first electrodes of each temperature fuse are connected to each other, and the second ends of the second electrodes of each temperature fuse are connected to each other.

[0013] Thirdly, this utility model also provides an onboard component, comprising a plurality of thermal fuses employing any of the above embodiments, wherein the thermal fuses are arranged in an array at intervals, and the second ends of the first electrodes of each thermal fuse are connected to each other, and the second ends of the second electrodes of each thermal fuse are connected to each other.

[0014] Fourthly, this utility model also provides a protection device, including a temperature fuse as described in any of the above embodiments; it also includes a bottom structure; the bottom structure includes a bottom housing and a first bottom electrode and a second bottom electrode passing through the bottom housing and partially located inside and partially located outside the bottom housing; the bottom housing accommodates the temperature fuse, the first bottom electrode is electrically connected to the first electrode, and the second bottom electrode is electrically connected to the second electrode.

[0015] In some embodiments, the second end of the first electrode and / or the second electrode extends toward the outer wall of the housing; the first bottom electrode and / or the second bottom electrode extends toward the interior of the bottom housing, and after the thermal fuse is assembled with the bottom structure, the first bottom electrode located inside the bottom housing contacts the first electrode located on the outer wall of the housing, and the second bottom electrode located inside the bottom housing contacts the second electrode located on the outer wall of the housing.

[0016] In some embodiments, the first bottom electrode includes a first bottom welding portion located outside the bottom housing and two first bottom contact portions connected to the first bottom welding portion; the two first bottom contact portions are disposed opposite to each other and extend from the outside of the bottom housing to the inside of the bottom housing; the second bottom electrode includes a second bottom welding portion located outside the bottom housing and two second bottom contact portions connected to the second bottom welding portion; the two second bottom contact portions are disposed opposite to each other and extend from the outside of the bottom housing to the inside of the bottom housing.

[0017] The temperature fuse provided by this utility model enables alloy welding between the first electrode and the second electrode through the through hole design of the housing. The welding heat source is brought as close as possible to the ends of the first electrode and the second electrode through the through hole to achieve the welding of the temperature-sensing alloy. This not only avoids the problems of reduced wetting space after the temperature-sensing alloy melts or excessive melting of the temperature-sensing alloy when welding the temperature-sensing alloy on the front of the electrode, which may lead to risks to product operation, but also helps to improve the welding quality and reduce the product size.

[0018] Other features and beneficial effects of this invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing this invention. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1A front sectional view of a temperature fuse provided in an embodiment of this utility model;

[0021] Figure 2 An exploded perspective view of a temperature fuse provided in an embodiment of this utility model;

[0022] Figure 3 A three-dimensional sectional view of the integrated structure of the first electrode, the second electrode, and the housing;

[0023] Figures 4-6 for Figure 1 A bottom sectional view of the first and second electrodes with different modifications to the first end;

[0024] Figures 7-9 The bottom view shows different variations of the shell with respect to the through hole;

[0025] Figure 10 A front sectional view of a temperature fuse provided in another embodiment of this utility model;

[0026] Figure 11 A top view of a temperature fuse provided in another embodiment of this utility model;

[0027] Figure 12 , Figure 13 Top views of the carrier tape provided for different embodiments of this utility model;

[0028] Figure 14 An exploded perspective view of a protective device provided in an embodiment of this utility model;

[0029] Figure 15 Exploded cross-section view of a protective device provided in an embodiment of this utility model;

[0030] Figure 16 An exploded perspective view of a protective device provided in another embodiment of this utility model;

[0031] Figure 17 Exploded cross-section view of a protective device provided in another embodiment of this utility model;

[0032] Figure 18 A front sectional view of a temperature fuse provided for other embodiments of this utility model;

[0033] Figure 19 , Figure 20 A top view of a temperature fuse during manufacturing process according to an embodiment of this utility model;

[0034] Figure 21 , Figure 22 This is a schematic diagram illustrating the application of the temperature fuse provided in this embodiment of the invention to a battery or battery pack.

[0035] Figure label:

[0036] 10-Housing; 10s-Accommodation space; 10a-Through hole; 11-Bottom shell; 12-Side shell; 21-First electrode; 22-Second electrode; 201-First end; 202-Second end; 20a-Bump; 20b-Notch; 10b-Groove; 10c-Flange; 203-Through groove; 30-Temperature-sensing alloy; 40-Fuse flux; 50-Encapsulation structure; 1-Temperature fuse; 61-First transition electrode; 62-Second electrode 70 - Two transition electrodes; 71 - Bottom structure; 72 - First bottom electrode; 73 - Second bottom electrode; 202a - First extension; 202b - First contact; 202c - Second extension; 202d - Second contact; 72a - First bottom welding portion; 72b - First bottom contact; 73a - Second bottom welding portion; 73b - Second bottom contact; 5 - Sheet-shaped thin film; 6 - Battery; 7 - Battery pack; 8 - Lead-out electrode. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. The technical features designed in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0038] In the description of this utility model, it should be noted that all terms used in this utility model (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model pertains, and should not be construed as limiting this utility model; it should be further understood that the terms used in this utility model should be understood to have the same meaning as those in the context of this specification and in the relevant field, and should not be understood in an idealized or overly formal sense, except as expressly defined in this utility model.

[0039] Example 1

[0040] Please see Figures 1-3 This utility model provides a temperature fuse, which includes: a first electrode 21, a second electrode 22, a temperature-sensing alloy 30, and a housing 10.

[0041] The first electrode 21 and the second electrode 22 can be in the form of wire, sheet, or irregularly shaped material. For example... Figures 1-3The first electrode 21 and the second electrode 22 are in sheet form. As an example, the materials of the first electrode 21 and the second electrode 22 include, but are not limited to, copper, copper alloys, silver, silver alloys, nickel, and stainless steel. Preferably, the first electrode 21 and the second electrode 22 are arranged in an axial or radial wiring configuration, for example... Figure 1 , Figure 2 It is an axial cable exit type. Figure 10 , Figure 11 It is a radial cable outlet type, and the specific design should be made according to the working requirements. No limit is given here.

[0042] The material of the shell 10 includes, but is not limited to, insulating materials such as plastics or ceramics. The structural shape of the shell 10 can be reasonably designed according to actual needs, and this embodiment is not limited thereto. By preferably using engineering plastics or thermosetting materials as the outer shell, the shell has better temperature resistance.

[0043] In this embodiment, a receiving space 10s is formed inside the housing 10. The first electrode 21 and the second electrode 22 each have a first end 201 and a second end 202. The first end 201 of the first electrode 21 and the first end 201 of the second electrode 22 are spaced apart within the receiving space 10s. The second ends 202 of the first electrode 21 and the second end 202 of the second electrode 22 pass through the housing 10 and are exposed outside the housing 10. Figure 3 As shown, preferably, the housing 10 is integrally formed with the first electrode 21 and the second electrode 22.

[0044] Specifically, the process of integrally forming the housing 10 with the first electrode 21 and the second electrode 22 includes, but is not limited to, injection molding, hot pressing, and bonding. Preferably, the housing 10 includes a bottom shell portion 11 and a side shell portion 12 extending upward from the bottom shell portion 11, the bottom shell portion 11 and the side shell portion 12 together forming the accommodating space 10s with an opening; the first electrode 21 and the second electrode 22 are located between the bottom shell portion 11 and the side shell portion 12.

[0045] By integrally molding the housing 10 with the first electrode 21 and the second electrode 22 during the forming process to create an integrated structure, the dimensions of the housing 10 and the first electrode 21 and the second electrode 22 are completely fixed. This prevents the dimensional stability issues caused by subsequent assembly, welding, and packaging processes, resulting in better dimensional stability and thus improving the assembly yield of the thermal fuse. Simultaneously, the integrated structure eliminates the assembly process between the housing and the electrodes, effectively improving the assembly efficiency of the thermal fuse.

[0046] The temperature-sensitive alloy 30 is located in the accommodating space 10s and is in electrical contact with the first end 201 of the first electrode 21 and the first end 201 of the second electrode 22, respectively.

[0047] The temperature-sensing alloy 30 is a low-melting-point alloy to ensure that it rapidly heats up and melts due to its own thermal effect under the action of a preset overload current, thereby breaking the conductive circuit and protecting the circuit. The temperature-sensing alloy 30 can be a rectangular sheet or an irregularly shaped sheet. As an example, the material of the temperature-sensing alloy 30 includes, but is not limited to, metals such as indium, bismuth, antimony, and tin, and their alloys.

[0048] In this embodiment, the temperature-sensitive alloy 30 is welded to the first electrode 21 and the second electrode 22 respectively, so that a conductive circuit is formed between the first electrode 21 and the second electrode 22 through the temperature-sensitive alloy 30.

[0049] Furthermore, such as Figure 1 As shown, the housing 10 has through holes 10a at the first end 201 near the first electrode 21 and the first end 201 of the second electrode 22, respectively. Preferably, the through holes 10a are formed on the bottom shell portion 11. The design of the through holes 10a facilitates the welding of the temperature-sensing alloy 30 to the first end 201 of the first electrode 21 and the first end 201 of the second electrode 22, respectively. The structure of the through holes 10a can be designed according to actual needs, and this embodiment is not limited thereto. For example... Figures 4-6 As shown, the cross-section of the through hole 10a can be rectangular, racetrack-shaped, or circular.

[0050] Specifically, in this embodiment, the welding heat source is not placed on the electrode surface where the temperature-sensitive alloy 30 is located. If the alloy is directly welded on the front of the electrode, the operating space is small due to the small size of the thermal fuse; furthermore, after the electrode is burned, an oxide layer forms on the electrode surface, reducing the wetting space after the alloy melts, posing a risk to product operation. In this embodiment, the welding heat source is placed below the through hole 10a on the bottom shell portion 11 of the housing 10. The heat source avoids the housing 10 and passes through the through hole 10a to transfer heat to the first end 201 of the first electrode 21 and the first end 201 of the second electrode 22. The first end 201 of the first electrode 21 and the first end 201 of the second electrode 22 then transfer heat to the temperature-sensitive alloy 30, so that the temperature-sensitive alloy 30 melts upon heating. After cooling, the temperature-sensitive alloy 30 is welded to the first electrode 21 and the second electrode 22 respectively, ensuring the wetting space of the temperature-sensitive alloy 30. This design ensures the heating position is as close to the alloy as possible. On one hand, it avoids the need for a sufficiently large 10s space for welding the temperature-sensitive alloy 30 within the housing 10; on the other hand, it avoids the problems of high heat loss, low heat transfer efficiency, and poor welding stability caused by welding the temperature-sensitive alloy 30 far from the housing 10, which would otherwise result in welding the alloy far from the heat source. This is particularly problematic in integrated structures where the housing 10 is integrated with the first electrode 21 and the second electrode 22, which significantly restricts the welding of the temperature-sensitive alloy 30. The design of the through-hole 10a in the housing 10 in this embodiment helps achieve stable and effective welding of the temperature-sensitive alloy 30 without increasing the 10s of accommodating space, and improves welding efficiency. Simultaneously, it allows the heating position to be as close to the alloy as possible, effectively improving heat transfer efficiency. The size and shape of the through-hole 10a can be reasonably designed according to actual welding requirements and are not limited here. Furthermore, in practical implementation, the heat absorption rate of the temperature-sensitive alloy 30 can be adjusted by regulating the power of the welding heat source and its distance from the temperature-sensitive alloy 30, thereby controlling the melting rate of the alloy 30.

[0051] In an alternative embodiment, please refer to Figures 7-9 The first end 201 of the first electrode 21 and the first end 201 of the second electrode 22 can be configured as irregular structures, which fit into the inner wall of the housing 10. This allows for a more stable integral molding of the first electrode 21, the second electrode 22, and the housing 10, effectively improving the strength of the integrated structure, reducing the impact of external forces on the thermal fuse during operation, and improving the reliability and service life of the thermal fuse. The cross-sections of the first end 201 of the first electrode 21 and the first end 201 of the second electrode 22 can be elliptical, rectangular, or other shapes.

[0052] For details, please continue reading. Figures 7-9The first electrode 21 has a protrusion 20a protruding horizontally to the side edge at its first end 201. The housing 10 has a corresponding groove 10b at the protrusion 20a position of the first end 201 of the first electrode 21, so that the first electrode 21 is fastened to the housing 10 by the engagement of the protrusion 20a and the groove 10b; or, the first electrode 21 has a notch 20b recessed inwards at its first end 201 side edge, and the housing 10 has a corresponding flange 10c at the notch 20b position of the first end 201 of the first electrode 21, so that the first electrode 21 is fastened to the housing 10 by the engagement of the notch 20b and the flange 10c; and / or Alternatively, the first end 201 of the second electrode 22 may have a protrusion 20a protruding horizontally to the side edge, and the housing 10 may have a groove 10b corresponding to the protrusion 20a at the first end 201 of the second electrode 22, so that the second electrode 22 is fastened to the housing 10 by the engagement of the protrusion 20a and the groove 10b; and / or, the first end 201 of the second electrode 22 may have a notch 20b recessed inward to the first end 201, and the housing 10 may have a flange 10c corresponding to the notch 20b at the first end 201 of the second electrode 22, so that the second electrode 22 is fastened to the housing 10 by the engagement of the notch 20b and the flange 10c.

[0053] It should be noted that the appendix Figures 7-9 The shapes, sizes, and number of protrusions 20a, grooves 10b, flanges 10c, and notches 20b given are merely examples, and this embodiment is not limited thereto. Specific designs can be made according to actual needs, and all variations of this concept fall within the protection scope of this utility model.

[0054] Example 2

[0055] Please continue reading. Figures 1-11 This second embodiment provides a temperature fuse, which includes the temperature fuse described in the first embodiment above. The specific design of the temperature fuse can be referred to the description in the first embodiment above, and will not be repeated here. The temperature fuse also includes a fluxing agent 40, which can be formed in the accommodating space 10s by injection molding, filling, or spraying, and covers the temperature-sensitive alloy 30 and extends to cover the first end 201 of the first electrode 21 and the first end 201 of the second electrode 22. The design of the fluxing agent 40 can facilitate the melting of the temperature-sensitive alloy 30, promote the retraction of the temperature-sensitive alloy 30 towards the first electrode 21 and the second electrode 22, and improve the efficiency of cutting off the conductive circuit. The material and structure of the fluxing agent 40 can use existing products that can achieve the fluxing effect, and are not limited here.

[0056] Furthermore, the thermal fuse also includes an encapsulation structure 50, which encapsulates the first electrode 21, the second electrode 22, the temperature-sensing alloy 30, and the fluxing agent 40 inside the housing 10. The encapsulation structure 50 can be encapsulated with thermosetting resin, or with a cover plate ultrasonically encapsulated, or with a thin film ultrasonically encapsulated, or with pre-coated adhesive, etc. Thermosetting resins include epoxy resin, UV resin, etc. In this embodiment, the encapsulation structure 50 preferably uses thermosetting resin or photocurable resin to fill the accommodating space 10s for encapsulation. Specifically, the photocurable resin can be a liquid resin that can be rapidly cured under ultraviolet light to obtain the encapsulation structure 50, effectively achieving rapid encapsulation at room temperature. Alternatively, the encapsulation structure 50 is preferably a cover plate or a thin film, which encapsulates the accommodating space 10s through ultrasonic welding, laser welding, hot pressing, or bonding processes, or is bonded to the housing 10 using thermosetting resin or photocurable resin.

[0057] When the encapsulation structure 50 uses a thin film, such as Figure 18 As shown, the thin film is applied to the opening of the housing 10 via ultrasonic welding, laser welding, hot pressing, or bonding, with a thickness between 0.02 and 0.2 mm. The film can be made of any material with good welding properties to the housing substrate to achieve thermal fuse encapsulation, such as PET, PEN, PBT, and PA. Compared to a cover plate, using a thinner film significantly reduces the height of the encapsulation structure 50 and the space occupied while ensuring encapsulation effectiveness, achieving extreme miniaturization of the thermal fuse. This type of thermal fuse is better suited for high-density circuit board scenarios and can be flexibly embedded in more sophisticated electronic systems, avoiding the encroachment of traditional large thermal fuses on the board area.

[0058] Further, please refer to Figures 7-9 The first electrode 21 and the second electrode 22 are provided with through grooves 203. When the thermal fuse is encapsulated, the encapsulation structure 50 can extend through the through grooves 203 to form pillars, thereby effectively enhancing the support strength of the thermal fuse and improving the bonding strength between the housing 10 and the first electrode 21 and the second electrode 22. For example, when the encapsulation structure 50 is made of thermosetting resin or photocurable resin, resin injection molding will fill the through grooves 203 to form pillars; when the encapsulation structure 50 is a cover plate, the surface of the cover plate can be provided with pillars corresponding to the through grooves 203, so that during encapsulation, the pillars on the cover plate pass through the through grooves 203 and abut against the housing 10. The structure of the through grooves 203 can be designed according to actual needs, and this embodiment is not limited thereto. For example Figures 7-9 The through groove 203 shown can be rectangular, circular, or racetrack-shaped.

[0059] It should be noted that, based on the above concept, and depending on the actual needs of the temperature fuse, those skilled in the art may also add other internal components to the temperature fuse, all of which fall within the protection scope of this utility model.

[0060] Taking the aforementioned thermal fuse as an example, the manufacturing process of this thermal fuse can be as follows:

[0061] a) A first electrode 21 and a second electrode 22 arranged in a straight line are pre-formed in a sheet metal material, wherein a certain gap is left between the first end 201 of the first electrode 21 and the first end 201 of the second electrode 22, and the second end 202 of the first electrode 21 and the second end 202 of the second electrode 22 are also on the sheet metal material to form a carrier tape with only electrodes.

[0062] b) The first electrode 21 and the second electrode 22 with a gap are then molded into a shell 10 by positioning in a cavity, so that the shell 10 and the first electrode 21 and the second electrode 22 form an integrated structure. The molding process can be such as injection molding or fluid resin curing. The shell 10 has through holes 10a at the positions of the first electrode 21 and the second electrode 22 respectively.

[0063] c) The temperature-sensitive alloy 30 is welded between the first end 201 of the first electrode 21 and the first end 201 of the second electrode 22 inside the housing 10 through the through hole 10a using processes such as laser welding, resistance welding or thermal welding.

[0064] d) Coating, filling, or spraying a layer of flux 40 onto the surface of the temperature-sensitive alloy 30;

[0065] e) After the flux 40 cools and sets, inject the UV-curable resin into the flux 40, and the UV-curable resin is cured by UV light.

[0066] f) The second end 202 of the first electrode 21 and the second end 202 of the second electrode 22 of the adjacent thermal fuses connected in the form of a carrier tape are cut off and separated to form a single thermal fuse, which is then marked, tested and packaged into a warehouse.

[0067] Example 3

[0068] This embodiment three provides a carrier tape, which includes multiple temperature fuses as described in the aforementioned embodiment one or embodiment two. The specific design of the temperature fuses can be referred to the descriptions in the aforementioned embodiment one and embodiment two, and will not be repeated here.

[0069] Specifically, please refer to Figure 12 , Figure 13Multiple thermal fuses 1 are arranged side-by-side at intervals, and the second ends 202 of the first electrodes 21 of each thermal fuse 1 are connected, as are the second ends 202 of the second electrodes 22 of each thermal fuse 1, to form a carrier tape. The carrier tape design effectively automates the feeding and assembly process, greatly facilitating the automated production of thermal fuses and significantly improving assembly efficiency. After any subsequent step of assembly is completed, individual products can be obtained by disconnecting the first electrodes 21 and second electrodes 22 between each thermal fuse 1. The structure of the first electrodes 21 and second electrodes 22 on the carrier tape can be customized according to actual assembly needs to meet various assembly environment requirements. For example… Figure 13 The first electrode 21 and the second electrode 22 are configured with irregular structures.

[0070] Example 4

[0071] Please see Figures 14-17 This fourth embodiment provides a protection device, which includes a temperature fuse as described in the previous embodiments one and two. The specific design of the temperature fuse can be referred to the descriptions in the previous embodiments one and two, and will not be repeated here.

[0072] Specifically, the protection device further includes a bottom structure 70; the bottom structure 70 includes a bottom housing 71 and a first bottom electrode 72 and a second bottom electrode 73 passing through the bottom housing 71; the bottom housing 71 houses the thermal fuse 1, the first bottom electrode 72 is electrically connected to the first electrode 21, and the second bottom electrode 73 is electrically connected to the second electrode 22. The protection device can employ a leadless design, by embedding the thermal fuse 1 within the bottom housing 71, facilitating the installation, maintenance, and replacement of the protection device.

[0073] Preferably, the first bottom electrode 72 and the second bottom electrode 73 on the inner side of the bottom structure 70 are electrically connected to the first electrode 21 and the second electrode 22 of the thermal fuse 1, respectively. The first bottom electrode 72 and the second bottom electrode 73 pass through the bottom housing 71 from the inside and are exposed on the outside of the bottom housing 71. The first bottom electrode 72 and the second bottom electrode 73 on the outside of the bottom structure 70 can be connected to the PCB board through wave soldering or reflow soldering to form a circuit. Through the design of the bottom structure 70 and the thermal fuse 1, the phenomenon of fuse damage and disconnection caused by some specifications of thermal fuses during wave soldering or reflow soldering can be effectively avoided, expanding the application scenarios of thermal fuses. When abnormal heating inside the electronic device causes the thermal fuse to disconnect, after troubleshooting and repairing the internal circuit of the device, the thermal fuse in the bottom structure can be replaced, and the electronic device can resume normal operation. At the same time, by soldering the protection device onto the PCB board through surface mount technology, the space occupied by the thermal fuse can be reduced, which is effective for devices with compact components and limited space.

[0074] In some embodiments, the second end 202 of the first electrode 21 and / or the second electrode 22 extends toward the outer wall of the housing 10; the first bottom electrode 72 and / or the second bottom electrode 73 extends toward the interior of the bottom housing 71. After the thermal fuse 1 is assembled with the bottom structure 70, the first bottom electrode 72 located inside the bottom housing 71 contacts the first electrode 21 located on the outer wall of the housing 10, and the second bottom electrode 73 located inside the bottom housing 71 contacts the second electrode 22 located on the outer wall of the housing 10.

[0075] Please see Figure 14 , Figure 15 The second end 202 of the first electrode 21 extends from the inside of the housing 10 toward the outer wall of the housing 10 to form a first extension 202a and a first contact portion 202b located on adjacent sides of the outer wall of the housing 10. The second end 202 of the second electrode 22 extends from the inside of the housing 10 toward the outer wall of the housing 10 to form a second extension 202c and a second contact portion 202d located on adjacent sides of the outer wall of the housing 10. That is, viewed from above, the second ends 202 of the first electrode 21 and the second electrode 22 form a structure in the thermal fuse 1 that surrounds the multifaceted outer wall of the housing 10. Of course, in other embodiments, the second ends 202 of the first electrode 21 and the second electrode 22 may only include the first contact portion 202b and the second contact portion 202d, and may not necessarily include the first extension portion 202a.

[0076] Please continue reading. Figure 14 , Figure 15 The first bottom electrode 72 extends from the bottom outer wall of the bottom housing 71 toward the interior of the bottom housing 71 to form a first bottom weld portion 72a and a first bottom contact portion 72b. The first bottom weld portion 72a is the portion of the first bottom electrode 72 located on the outside of the bottom housing 71, and the first bottom contact portion 72b is the portion of the first bottom electrode 72 connected to the first bottom weld portion 72a and extending from the outside of the bottom housing 71 toward the interior of both sides of the bottom housing 71. That is, in side view, the first bottom electrode 72 has a U-shaped structure located on opposite sides of the bottom structure 70. The second bottom electrode 73 extends from the bottom outer wall of the bottom housing 71 toward the interior of the bottom housing 71 to form a second bottom weld portion 73a and a second bottom contact portion 73b. The second bottom weld portion 73a is the portion of the second bottom electrode 73 located on the outside of the bottom housing 71, and the second bottom contact portion 73b is the portion of the second bottom electrode 73 connected to the second bottom weld portion 73a and extending from the outside of the bottom housing 71 toward the interior of both sides of the bottom housing 71. That is, when viewed from the side, the second bottom electrode 73 has a U-shaped structure located on both sides of the bottom structure 70.

[0077] When the thermal fuse 1 is assembled with the base structure 70, the first contact portion 202b of the first electrode 21 makes electrical contact with the first bottom contact portion 72b of the first bottom electrode 72, and the second contact portion 202d of the second electrode 22 makes electrical contact with the second bottom contact portion 73b of the second bottom electrode 73. The first bottom solder portion 72a of the first bottom electrode 72 and the second bottom solder portion 73a of the second bottom electrode 73 are used for soldering in the main circuit, such as on a PCB board.

[0078] The above configuration effectively increases the contact area between the first electrode 21 and the first bottom electrode 72, and between the second electrode 22 and the second bottom electrode 73, thereby improving the stability of circuit flow.

[0079] In another alternative embodiment, please refer to Figure 16 , Figure 17 The outer side of the thermal fuse 1 also has a first transition electrode 61 and a second transition electrode 62 covering more than 10 outer surfaces of the housing 10. The inner wall of the first transition electrode 61 is in electrical contact with the first electrode 21 exposed outside the housing 10, and the inner wall of the second transition electrode 62 is in electrical contact with the second electrode 22 exposed outside the housing 10. A portion of the outer wall of the first transition electrode 61 is in electrical contact with the first bottom electrode 72, and a portion of the outer wall of the second transition electrode 62 is in electrical contact with the second bottom electrode 73. This arrangement effectively increases the contact area of ​​each electrode connection, thereby improving the stability of the circuit flow.

[0080] Preferably, the first bottom welding portion 72a and the first bottom contact portion 72b are both flat plates. There are two first bottom contact portions 72b, which are arranged opposite to each other. The first bottom welding portion 72a is connected to each of the two first bottom contact portions 72b, and the two first bottom contact portions 72b extend from the outside of the bottom outer shell 71 into the inside of the bottom outer shell 72. The second bottom welding portion 73a and the second bottom contact portion 73b are both flat plates. There are two second bottom contact portions 73b, which are arranged opposite to each other. The second bottom welding portion 73a is connected to each of the two second bottom contact portions 73b, and the two second bottom contact portions 73b extend from the outside of the bottom outer shell 71 into the inside of the bottom outer shell 72. The second bottom electrode 73 is symmetrically distributed with the first bottom electrode 72. The flat plate design reduces the space occupied by the electrodes, which is beneficial for the miniaturization of the thermal fuse.

[0081] It should be noted that, regarding the shape and structure of the first bottom electrode 72, the second bottom electrode 73, the first electrode 21, and the second electrode 22, those skilled in the art can, based on this concept and according to actual needs, replace them with other structures that can achieve electrical connection between the first bottom electrode 72 and the first electrode 21 and between the second bottom electrode 73 and the second electrode 22, all of which fall within the protection scope of this utility model.

[0082] Preferably, the second end 202 of the first electrode 21 and / or the second electrode 22 extends toward the outer wall of the housing 10 and forms a protruding end cap (not shown in the figure); the first bottom electrode 72 and / or the second bottom electrode 73 extends toward the inner side of the bottom housing 71 and forms a recessed groove (not shown in the figure) at the position corresponding to the protruding end cap. When the thermal fuse 1 is assembled with the bottom structure 70, the protruding end cap engages with the recessed groove. By designing the protruding end cap to engage with the recessed groove, the assembly of the thermal fuse 1 and the bottom structure 70 can be achieved simply and effectively, and the stable connection between the first bottom electrode 72 and the first electrode 21 and the second bottom electrode 73 and the second electrode 22 can be effectively promoted.

[0083] Example 5

[0084] This utility model also provides a method for manufacturing a thermal fuse, comprising the following steps:

[0085] The first electrode 21 and the second electrode 22 with gaps are molded to form a housing 10 with an accommodating space 10s, so that the housing 10 forms an integrated structure with the first electrode 21 and the second electrode 22, and the housing 10 has a through hole 10a at the position of the first electrode 21 and the second electrode 22.

[0086] As an example, two first electrodes 21 and second electrodes 22 arranged in a straight line can be pre-formed in a sheet metal plate. A certain gap is left between the first ends 201 of the first electrodes 21 and 22 used for welding the temperature-sensitive alloy 30, and the second ends 202 of the first electrodes 21 and 22 are also attached to the sheet metal plate. For example... Figure 12 A first electrode 21 and a second electrode 22 with symmetrical gaps are formed by uniformly spaced carrier tapes; then, the first electrode 21 and the second electrode 22 with gaps are molded through a cavity to form a housing 10 with an accommodating space 10s, and a through hole 10a is pre-reserved at the position of the first electrode 21 and the second electrode 22 at the bottom of the housing 10; that is, a housing 10 with a symmetrical gap is formed. Figure 3 The integrated structure shown. The molding process may include, but is not limited to, injection molding, fluid resin curing, etc.

[0087] A heat source passes through the through-hole 10a below the housing 10 to weld the temperature-sensitive alloy 30 between the first end 201 of the first electrode 21 and the first end 201 of the second electrode 22 within the accommodating space 10s. That is, the heat source passes through the through-hole 10a to weld the electrode ends to the temperature-sensitive alloy 30. The welding process may include, but is not limited to, laser welding, resistance welding, or thermal welding.

[0088] Next, a fluxing agent 40 is coated, filled, or sprayed onto the surface of the temperature-sensitive alloy 30. After the fluxing agent 40 cools and sets, the entire structure is encapsulated by an encapsulation structure 50. The encapsulation structure 50 includes a thermosetting resin or a photocurable resin to encapsulate the accommodating space 10s, or the encapsulation structure 50 includes a cover plate or a film to encapsulate the housing 10 by ultrasonic welding, laser welding, hot pressing, or bonding. For example, photosensitive resin can be injected into the accommodating space 10s, and the photosensitive resin can be cured by UV light to complete the encapsulation.

[0089] Finally, the second ends 202 of the adjacent first electrode 21 and the second ends 202 of the second electrode 22 on the temperature fuse 1, which are connected in the form of a carrier tape, are cut off and separated to form a single independent temperature fuse 1, which is then marked, tested and packaged into a warehouse.

[0090] It should be noted that the specific structure, function, and role of each component in this embodiment can be referred to the above embodiments one and two, and will not be repeated here.

[0091] Example 6

[0092] This sixth embodiment also provides an onboard component, which includes multiple thermal fuses as described in the foregoing embodiments one or two. The specific design of the thermal fuses can be referred to the descriptions in embodiments one and two, and will not be repeated here.

[0093] Specifically, please refer to Figure 19 Multiple thermal fuses 1 are arranged in an array with spacing between them, and the second ends 202 of the first electrodes 21 of each thermal fuse 1 are connected to each other, and the second ends 202 of the second electrodes 22 of each thermal fuse 1 are connected to each other, forming an array-spaced onboard device with several rows and columns. The arrangement of the thermal fuses 1 on the onboard device is not limited to... Figure 19 The matrix arrangement shown can also be a staggered arrangement with several rows and columns, which can be designed according to actual needs. The onboard design effectively automates material loading and assembly operations, greatly facilitating the automated production of thermal fuses and significantly improving assembly efficiency. After any subsequent step of assembly, the individual product can be obtained by disconnecting the first electrode 21 and the second electrode 22 between each thermal fuse 1. The structure of the first electrode 21 and the second electrode 22 on the onboard can be customized according to actual assembly requirements to meet various assembly environment requirements. For example… Figure 13 The first electrode 21 and the second electrode 22 are configured with irregular structures.

[0094] Example 7

[0095] This utility model also provides a method for manufacturing a thermal fuse, comprising the following steps:

[0096] Several sets of spaced-apart first electrodes 21 and second electrodes 22 are pre-formed on a sheet metal plate using a carrier tape or on-plate method. The first end 201 of the first electrode 21 and the first end 201 of the second electrode 22 have a gap and are arranged in a straight line. The second ends 202 of the several sets of spaced-apart first electrodes 21 and the second ends 202 of the second electrodes 22 are also connected to the sheet metal plate. For example... Figure 19 The first electrode 21 and the second electrode 22 are formed in a plate-mounted form with a number of rows and columns of symmetrical spacing in a uniformly spaced array.

[0097] Each set of first electrodes 21 and second electrodes 22 with gaps is molded to form a housing 10 with an accommodating space 10s, so that the housing 10 and the first electrodes 21 and second electrodes 22 form an integrated structure, and the housing 10 has a through hole 10a at the position of the first electrode 21 and the second electrode 22; that is, forming a structure as shown in the figure. Figure 3 The integrated structure shown. The molding process may include, but is not limited to, injection molding, fluid resin curing, etc.

[0098] The heat source passes through the through hole 10a below the housing 10 to weld the temperature-sensitive alloy 30 between the first end 201 of the first electrode 21 and the first end 201 of the second electrode 22 within the accommodating space 10s; that is, the electrode ends are welded to the temperature-sensitive alloy 30 through the through hole 10a. The welding process may include, but is not limited to, laser welding, resistance welding, or thermal welding.

[0099] A fluxing agent 40 is formed on the temperature-sensitive alloy 30. As an example, the fluxing agent 40 can be covered on the surface of the temperature-sensitive alloy 30 by coating, filling or spraying. After the fluxing agent 40 cools and sets, it is then encapsulated.

[0100] The accommodating space 10s is encapsulated on the housing 10 using a thin film or by injecting a light-curing resin to form a thermal fuse. Specifically, the accommodating space 10s can be encapsulated by ultrasonic welding, laser welding, hot pressing, or bonding.

[0101] The second ends 202 of the adjacent first electrode 21 and the second ends 202 of the second electrode 22 on the temperature fuse 1, which are connected in the form of a carrier tape or a plate, are cut off and separated to form an independent temperature fuse 1. The individual temperature fuse 1 is marked, tested and then packaged and stored.

[0102] In a preferred embodiment, the step of encapsulating the accommodating space 10s on the housing 10 using a thin film includes:

[0103] Please see Figure 20The sheet-like film 5 is encapsulated on the housing 10 of the temperature fuse 1, which is connected in the form of a carrier tape or on a board, by ultrasonic welding, laser welding, hot pressing, or bonding. Based on the contour of the housing 10 of the temperature fuse 1, individual films located on several arrays of temperature fuses 1 are cut by laser cutting, thereby completing the encapsulation of the accommodating space 10s by the film on each temperature fuse 1. Compared with the traditional method of encapsulating individual fuses one by one, this embodiment uses a large-area sheet-like film 5 to cover the entire temperature fuse 1 on the board for encapsulation before cutting it into individual films, which can save steps such as positioning, clamping, and repeated welding, and greatly improve production efficiency.

[0104] Furthermore, this utility model also discloses a battery and battery pack with a thermal fuse 1. The thermal fuse 1 can be used to achieve over-temperature protection on a single battery 6, or applied to a battery pack formed by multiple batteries 6 connected in series and parallel to achieve over-temperature protection. The thermal fuse 1 can be obtained using the structures or methods provided in the above embodiments, which will not be elaborated further here. For example... Figure 21 As shown, the thermal fuse 1 is connected between the two batteries 6 in series to provide over-temperature protection. For example... Figure 22 As shown, four batteries 6 connected in parallel form a battery pack 7. Adjacent battery packs 7 are connected by a thermal fuse 1 to form a battery stack. The current is then led out through lead-out electrodes 8, effectively enabling each battery pack to achieve over-temperature protection. In other embodiments, several batteries 6 can be selected for series and / or parallel connection according to actual needs, and connected to a thermal fuse 1 to achieve over-temperature protection.

[0105] In summary, the temperature fuse, carrier tape, on-board protective device provided by this utility model, through the through-hole design and integrated structure design of the housing at the positions of the first and second electrodes, not only solves the problems of large size, inconsistent electrode lead positions, and poor bonding between the electrodes and the encapsulating resin under high temperature conditions in traditional temperature fuses, but also effectively improves the reliability and stability of temperature-sensing alloy welding and achieves maximum miniaturization design. Furthermore, it improves dimensional stability, facilitates automated assembly and feeding, and thus effectively improves product quality, showing good application prospects.

[0106] Furthermore, those skilled in the art should understand that although many problems exist in the prior art, each embodiment or technical solution of this utility model can be improved in only one or a few aspects, without necessarily solving all the technical problems listed in the prior art or background art simultaneously. Those skilled in the art should understand that any content not mentioned in a claim should not be construed as a limitation on that claim.

[0107] Although this document frequently uses terms such as housing, first electrode, second electrode, temperature-sensitive alloy, fluxing agent, photocurable resin, carrier tape, bottom structure, bottom shell, first bottom electrode, and second bottom electrode, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model. The terms "first," "second," etc. (if present), in the description, claims, and accompanying drawings of the embodiments of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0108] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A temperature fuse, characterized by The temperature fuse comprises: a first electrode, a second electrode, a temperature sensing alloy and a shell; the shell has a receiving space formed inside; the first electrode and the second electrode each have opposite first end portions and second end portions; the first end portion of the first electrode and the first end portion of the second electrode are oppositely arranged in the receiving space; the temperature sensing alloy is located in the receiving space and electrically contacts the first end portion of the first electrode and the first end portion of the second electrode respectively; the shell has a through hole at the first end portion of the first electrode and the first end portion of the second electrode respectively.

2. The thermal cutoff according to claim 1, characterized in that: The shell comprises a bottom shell portion and a side shell portion extending upward from the bottom shell portion, the bottom shell portion and the side shell portion jointly form the receiving space with an opening; the first electrode and the second electrode are located between the bottom shell portion and the side shell portion; the through hole is formed in the bottom shell portion.

3. The thermal cutoff of claim 1, wherein: The first end portion of the first electrode is provided with a protrusion horizontally protruding to the side edge, and the shell is provided with a groove corresponding to the position of the protrusion of the first end portion of the first electrode, so that the first electrode is fastened with the shell by the fitting of the protrusion and the groove; and / or, the first end portion of the first electrode is provided with a notch recessed to the inside of the first end portion, and the shell is provided with a flange corresponding to the position of the notch of the first end portion of the first electrode, so that the first electrode is fastened with the shell by the fitting of the notch and the flange. And / or, the first end portion of the second electrode is provided with a protrusion horizontally protruding to the side edge, and the shell is provided with a groove corresponding to the position of the protrusion of the first end portion of the second electrode, so that the second electrode is fastened with the shell by the fitting of the protrusion and the groove; and / or, the first end portion of the second electrode is provided with a notch recessed to the inside of the first end portion, and the shell is provided with a flange corresponding to the position of the notch of the first end portion of the second electrode, so that the second electrode is fastened with the shell by the fitting of the notch and the flange.

4. The thermal cutoff of claim 1, wherein: The first electrode and the second electrode are provided with through grooves; the shell is integrally formed with the first electrode and the second electrode.

5. The thermal cutoff of claim 1, wherein: Further comprising a packaging structure; the packaging structure comprises a thermosetting resin or a light-curing resin or a cover plate or a film; the thermosetting resin or the light-curing resin fills the receiving space for packaging, the cover plate or the film packages the receiving space by ultrasonic welding or laser welding or hot pressing or bonding, or is bonded with the shell by the thermosetting resin or the light-curing resin.

6. A carrier tape characterized by: A plurality of temperature fuses according to any one of claims 1-5 are arranged in parallel at intervals, and the second end portions of the first electrodes of the temperature fuses are connected, and the second end portions of the second electrodes of the temperature fuses are connected.

7. An on-board characterized in that: A plurality of temperature fuses according to any one of claims 1-5 are arranged in an array at intervals, and the second end portions of the first electrodes of the temperature fuses are connected, and the second end portions of the second electrodes of the temperature fuses are connected.

8. A protection device characterized by: A temperature fuse according to any one of claims 1-5 is used. The bottom structure comprises a bottom shell and a first bottom electrode and a second bottom electrode penetrating through the bottom shell and partially located inside the bottom shell and partially located outside the bottom shell; the bottom shell accommodates the temperature fuse, the first bottom electrode is electrically connected with the first electrode, and the second bottom electrode is electrically connected with the second electrode.

9. The protection device of claim 8, wherein: The second end of the first electrode and / or the second electrode extends to the outer wall of the shell; the first bottom electrode and / or the second bottom electrode extends to the inside of the bottom shell, and after the temperature fuse is assembled with the bottom structure, the first bottom electrode located in the inside of the bottom shell is in contact with the first electrode located in the outer wall of the shell, and the second bottom electrode located in the inside of the bottom shell is in contact with the second electrode located in the outer wall of the shell.

10. The protection device of claim 9, wherein: The first bottom electrode comprises a first bottom welding part located outside the bottom shell and two first bottom contact parts connected with the first bottom welding part respectively; the two first bottom contact parts are oppositely arranged and extend from the outside of the bottom shell to the inside of the bottom shell; the second bottom electrode comprises a second bottom welding part located outside the bottom shell and two second bottom contact parts connected with the second bottom welding part respectively; the two second bottom contact parts are oppositely arranged and extend from the outside of the bottom shell to the inside of the bottom shell.

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