Controlled fuse

Abstract

The utility model discloses a controlled fuse, which comprises a first electrode plate, a second electrode plate, a first temperature sensing body, a second temperature sensing body, a heating tube and an insulating heat insulation sheet, the first temperature sensing body is located between the first electrode plate and the second electrode plate, the two ends of the first temperature sensing body are connected to the first electrode plate and the second electrode plate respectively, and the first temperature sensing body is tightly attached to the heating tube; the heating tube is also located between the first electrode plate and the second electrode plate, and the heating tube is separated from the first electrode plate and the second electrode plate through the insulating heat-resisting sheet; the heating tube is connected with a first pin and a second pin, and the second temperature sensing body is connected with the first pin in series. Therefore, the first temperature sensing body is arranged to be directly attached to the heating tube, timely fusing can be achieved, and error fusing is avoided; and by arranging the insulating heat-resisting sheet, the safety performance of the product can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of fuses, in particular to a controlled fuse. Background Art

[0002] The system protection used in the lithium battery protection systems or energy storage systems currently available on the market mostly adopts controlled containers as secondary protection to sense abnormal temperatures in time, cut off the circuit, prevent thermal runaway, and ensure safety.

[0003] Existing controlled fuses, such as a DC controlled fuse disclosed in Chinese patent application publication number CN114334574A, have a first temperature sensor mounted on the first and second electrode sheets, the first temperature sensor is not in direct contact with the heating sheet, the first electrode sheet and the second electrode sheet clamp the heating sheet, when the IGBT or MOS tube receives a circuit voltage signal, the heating sheet generates heat, the heat generated by the heat first passes through the first electrode sheet and the second electrode sheet, and then is conducted to the first temperature sensor, which will cause the first temperature sensor to receive uneven heat transfer and easily cause false melting or untimely melting, at the same time, the heat generated by the heating sheet is transferred to the first and second electrode sheets, which can easily make the first electrode sheet and the second electrode sheet turn red, and the coating can be easily oxidized and damaged.

[0004] Secondly, the first electrode sheet and the second electrode sheet sandwich the heating sheet above and below. The heating sheet is prone to bursting due to external stress and uneven heating itself, thereby affecting the safe cutting off of the control circuit, which can easily cause the electric vehicle lithium battery to spontaneously combust or explode, endangering personal safety. Utility Model Content

[0005] The purpose of the utility model is to provide a controlled fuse, which can solve the above-mentioned problem of easy false blowing or untimely blowing, and has the advantages of rapid response to blowing, fast blowing speed, not easy to false blowing, and increased fuse service life.

[0006] In order to achieve the above purpose, the solution of the utility model is:

[0007] A controlled fuse includes a first electrode sheet, a second electrode sheet, a first temperature sensing body, a second temperature sensing body, a heating tube and an insulating heat-insulating sheet;

[0008] The first temperature sensor is located between the first electrode sheet and the second electrode sheet, two ends of the first temperature sensor are respectively connected to the first electrode sheet and the second electrode sheet, and the first temperature sensor is close to the heating tube;

[0009] The surface and surrounding of the first temperature sensing body are coated with flux;

[0010] The heating tube is also located between the first electrode sheet and the second electrode sheet, and the insulating heat-insulating sheet is arranged between the heating tube and the first electrode sheet and the second electrode sheet for separation;

[0011] The heating tube is connected to a first pin and a second pin, and the second temperature sensor is connected in series to the first pin.

[0012] Furthermore, it also includes a shell consisting of a base and an upper cover; the first temperature sensor, the second temperature sensor, the heating tube and the insulating heat-shielding sheet are all installed in the shell; the inner ends of the first electrode sheet, the second electrode sheet and the first pin and the second pin are all located in the shell, and the outer ends are all extended out of the shell.

[0013] Furthermore, the first electrode sheet and the second electrode sheet are located on the left and right sides of the heating tube; the first temperature sensor is closely arranged on the upper side of the heating tube, and the insulating heat-insulating sheet is arranged around the left, right and lower sides of the heating tube, so that the heating tube is not in direct contact with the shell.

[0014] Furthermore, the heating tube is a circular tube extending axially forward and backward; the first temperature sensing body is an arc-shaped sheet and is closely attached to the outer wall on the upper side of the heating tube; the insulating heat-insulating sheet is an arc-shaped sheet and is wrapped around the remaining outer walls on the left, right and lower sides of the heating tube; an arc-shaped portion is formed at each adjacent end of the first electrode sheet and the second electrode sheet, the two arc-shaped portions are symmetrical to each other, and the two arc-shaped portions are respectively attached to the left and right sides of the insulating heat-insulating sheet, and the upper ends of the two arc-shaped portions are respectively connected to the two ends of the first temperature sensing body.

[0015] Furthermore, the first electrode sheet and the second electrode sheet are installed on the base, and a heat dissipation space is formed between the base and the upper cover; the two arc-shaped portions, the heating tube and the first temperature sensing body are located in the middle of the heat dissipation space.

[0016] Furthermore, the first electrode sheet and the second electrode sheet are distributed on the left and right; there are multiple first temperature sensors, which are arranged at intervals along the front-to-back direction, and each first temperature sensor is connected to the first electrode sheet and the second electrode sheet respectively; the flux is coated between adjacent first temperature sensors.

[0017] Furthermore, a group of multiple protrusions are provided on the left and right sides of the top of the base; the first electrode sheet and the second electrode sheet are respectively installed on the left and right sides of the top of the base, and the first electrode sheet and the second electrode sheet are respectively provided with a plurality of positioning holes for each protrusion to pass through for positioning.

[0018] Furthermore, notches communicating with the outside are provided on the left and right sides of the top of the base on the outer sides of each group of convex columns; bosses are formed on the left and right sides of the bottom of the upper cover respectively; a plurality of recessed slots are provided on the top of the base, and a plurality of protruding hooks are provided on the bottom of the upper cover. When the upper cover and the base are fastened together, the hooks are hooked into the slots, and the bosses extend into the notches and press the first electrode sheet and the second electrode sheet.

[0019] Furthermore, the shell is provided with an independent placement groove for placing the second temperature sensor.

[0020] After adopting the above technical scheme, the structure of the controlled fuse has two protection functions of the main circuit and the control circuit. The main circuit control part is composed of: a first electrode sheet, a first temperature sensor, a flux, and a second electrode sheet. The current in the main circuit flows through the first electrode sheet, the first temperature sensor and the second electrode sheet. When the circuit flows through the first temperature sensor, the first temperature sensor is heated. Since a layer of flux is coated on the surface or around the first temperature sensor, the first temperature sensor can be melted faster, thereby playing the overcurrent protection function of the main circuit; the control circuit part is composed of a heating tube, two pins and a second temperature sensor. When the control circuit receives the IGBT or MOS tube voltage signal in the circuit, the heating tube will heat up. Since the first temperature sensor is close to the heating tube and receives heat more evenly, the first temperature sensor can receive the heat generated by the heating tube in the first time to achieve rapid response and melting, and the melting speed is fast, thereby cutting off the main circuit and realizing the overvoltage protection function; and when the first temperature sensor is melted, the heating tube continues to heat up, and the second temperature sensor will automatically melt after sensing the heat to realize the overtemperature protection function. At the same time, the insulating heat-insulating sheet separates the heating tube from the first electrode sheet and the second electrode sheet, so as to prevent the heating tube from damaging the first electrode sheet and the second electrode sheet, thereby extending the service life of the product and increasing safety and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A three-dimensional diagram of an embodiment of the utility model;

[0022] Figure 2 A partial structural perspective view of an embodiment of the utility model (I);

[0023] Figure 3 It is a partial structural stereogram of an embodiment of the utility model (II);

[0024] Figure 4 An exploded view of an embodiment of the utility model;

[0025] Figure 5 A top view of an embodiment of the utility model;

[0026] Figure 6 for Figure 5 Sectional view at AA;

[0027] Figure 7 A three-dimensional diagram of a base according to an embodiment of the present utility model;

[0028] Figure 8 A three-dimensional diagram of an upper cover of an embodiment of the utility model;

[0029] Fig. 9 It is a schematic diagram of the combination of the main components of the embodiment of the utility model;

[0030] Fig.10 It is a three-dimensional diagram of the heating tube, the second temperature sensing body and the pins according to the embodiment of the utility model.

[0031] Explanation of reference numerals: first electrode sheet 1, second electrode sheet 2, first temperature sensor 3, second temperature sensor 4, heating tube 5, insulating heat-insulating sheet 6, first pin 7, second pin 8, flux 9, shell 10, base 11, boss 111, notch 112, slot 113, placement slot 114, upper cover 12, boss 121, hook 122, heat dissipation space 13, arc-shaped portion a, positioning hole b. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0033] like Figures 1 to 10 As shown, a controlled fuse of the utility model is mainly used to protect the circuit system, and has the function of comprehensive protection of overcurrent, overvoltage and overtemperature. It can sense abnormal temperature in time, cut off the circuit, prevent the occurrence of thermal runaway, and ensure safety.

[0034] like Figure 4 As shown, the controlled fuse includes a first electrode sheet 1, a second electrode sheet 2, a first temperature sensing body 3, a second temperature sensing body 4, a heating tube 5 and an insulating heat-shielding sheet 6.

[0035] See also Figure 2 and Figure 3 The first temperature sensing body 3 is located between the first electrode sheet 1 and the second electrode sheet 2, and the two ends of the first temperature sensing body 3 are respectively connected to the first electrode sheet 1 and the second electrode sheet 2, and the first temperature sensing body 3 is close to the heating tube 5; and the surface and surrounding of the first temperature sensing body 3 are coated with a flux 9; so that the first temperature sensing body 3 can quickly and evenly receive the heat of the heating tube 5, so as to trigger the fuse in time.

[0036] The heating tube 5 is also located between the first electrode sheet 1 and the second electrode sheet 2, and the insulating heat-shielding sheet 6 is provided between the heating tube 5 and the first electrode sheet 1 and the second electrode sheet 2 to separate them; so as to avoid the heat generated by the heating tube 5 from being transferred to the first electrode sheet 1 and the second electrode sheet 2, to avoid oxidation damage to the coating, and to improve the service life.

[0037] The heating tube 5 is connected to a first pin 7 and a second pin 8 , and the second temperature sensor 4 is connected in series to the first pin 7 .

[0038] Thus, the structure of the controlled fuse has two protection functions of the main circuit and the control circuit. The main circuit control part is composed of: the first electrode sheet 1, the first temperature sensing body 3, the flux 9, and the second electrode sheet 2. The current in the main circuit flows through the first electrode sheet 1, the first temperature sensing body 3 and the second electrode sheet 2. When the circuit flows through the first temperature sensing body 3, the first temperature sensing body 3 is heated. Since a layer of flux 9 is coated on the surface or around the first temperature sensing body 3, the first temperature sensing body 3 can be melted faster, thereby playing the overcurrent protection function of the main circuit; the control circuit part: consists of the heating tube 5, the two The first temperature sensor 3 is composed of a pin and a second temperature sensor 4. When the control circuit receives the IGBT or MOS tube voltage signal in the circuit, the heating tube 5 will heat up. Since the first temperature sensor 3 is close to the heating tube 5 and receives heat evenly, the first temperature sensor 3 can receive the heat generated by the heating tube 5 in the first time to achieve rapid response and fusing, and the fusing speed is fast, thereby cutting off the main circuit and realizing the overvoltage protection function; and when the first temperature sensor 3 is blown, the heating tube 5 continues to generate heat, and the second temperature sensor 4 will automatically blow after sensing the heat to realize the over-temperature protection function. At the same time, the insulating heat-insulating sheet 6 separates the heating tube 5 from the first electrode sheet 1 and the second electrode sheet 2, preventing the heating tube 5 from heating up and damaging the first electrode sheet 1 and the second electrode sheet 2, so that the product has a longer service life and higher safety and reliability.

[0039] like Figure 1 and Figure 6 As shown, in this embodiment, it also includes a shell 10 composed of a base 11 and an upper cover 12; the first temperature sensor 3, the second temperature sensor 4, the heating tube 5 and the insulating heat-insulating sheet 6 are all installed in the shell 10; the inner ends of the first electrode sheet 1, the second electrode sheet 2 and the first pin 7 and the second pin 8 are all located in the shell 10, and the outer ends are all extended out of the shell 10, so as to be connected to the circuit system.

[0040] Specifically, the first electrode sheet 1 and the second electrode sheet 2 of this embodiment can be located on the left and right sides of the heating tube 5; the first temperature sensing body 3 is closely arranged on the upper side of the heating tube 5, and the insulating heat-insulating sheet 6 is arranged around the left, right and lower sides of the heating tube 5, so that the heating tube 5 is not in direct contact with the housing 10. The heat generated by the heating tube 5 will not melt the base 11 and the upper cover 12, thereby ensuring the service life of the product.

[0041] In this embodiment, the heating tube 5 is a circular tube extending axially forward and backward. The heat distribution of the circular tube is uniform, and the heating tube 5 is not easy to burst, which can further improve the safety of the product.

[0042] In this embodiment, the first temperature sensing body 3 is an arc-shaped sheet, and is closely attached to the outer wall of the upper side of the heating tube 5 to evenly receive the heat generated by the heating tube 5. The insulating heat-insulating sheet 6 is an arc-shaped sheet body approximately in a "U" shape, and can cover the remaining outer walls on the left, right and lower sides of the heating tube 5, so as to fully insulate the remaining part of the heating tube 5 and further prevent the base 11 from melting.

[0043] Accordingly, see Fig. 9 An arc portion a is formed at one adjacent end of the first electrode sheet 1 and the second electrode sheet 2, respectively. The two arc portions a are symmetrical to each other, and the shapes of the two arc portions a match the shape of the insulating heat-insulating sheet 6, so as to be respectively abutted against the left and right sides of the insulating heat-insulating sheet 6, which can make the structure more compact and more convenient to install, and the upper ends of the two arc portions a are respectively connected to the two ends of the first temperature sensing body 3.

[0044] In this embodiment, the heating tube 5 is in the shape of a round tube, which has better safety, but it does not mean that it is limited to a round tube.

[0045] like Figure 2 and Figure 6 As shown, the first electrode sheet 1 and the second electrode sheet 2 are installed on the base 11 , and a heat dissipation space 13 is formed between the base 11 and the upper cover 12 ; the two arc-shaped portions a, the heating tube 5 and the first temperature sensing body 3 are located in the middle of the heat dissipation space 13 .

[0046] The first temperature sensing bodies 3 may be multiple and spaced apart in the front-to-back direction, and each first temperature sensing body 3 is respectively connected to the first electrode sheet 1 and the second electrode sheet 2. The number of the first temperature sensing bodies 3 may be determined according to the size of the circuit to be supported. The flux 9 is coated between adjacent first temperature sensing bodies 3. The surface and surrounding of the first temperature sensing body 3 are coated with the flux 9.

[0047] See also Figure 7 , the top left and right sides of the base 11 are each provided with a group of multiple protrusions 111, and each group of the present embodiment has three protrusions 111; and a notch 112 connected to the outside is also provided on the outside of each group of protrusions 111; the first electrode sheet 1 and the second electrode sheet 2 are respectively installed on the top left and right sides of the base 11, and the first electrode sheet 1 and the second electrode sheet 2 are respectively provided with a plurality of positioning holes b for each protrusion 111 to pass through for positioning, and the outer ends of the first electrode sheet 1 and the second electrode sheet 2 extend out of the notch 112. Figure 8, bosses 121 are formed on the left and right sides of the bottom of the upper cover 12; when the upper cover 12 and the base 11 are combined, the bosses 121 extend into the notch 112 and press the first electrode sheet 1 and the second electrode sheet 2, so as to facilitate installation and make the installation of the first electrode sheet 1 and the second electrode sheet 2 more stable.

[0048] like Figure 7 and Figure 8 As shown, in this embodiment, a plurality of slots 113 are recessed on the top of the base 11 , and a plurality of hooks 122 are protruded on the bottom of the upper cover 12 . When the upper cover 12 and the base 11 are fastened together, the hooks 122 are hooked into the slots 113 .

[0049] Another example Figure 2 and Figure 7 As shown, an independent placement groove 114 is provided on the base 11 of the shell 10 for placing the second temperature sensor 4. The front and rear ends of the heating tube 5 are respectively connected to the first pin 7 and the second pin 8. The second temperature sensor 4 of this embodiment is connected in series to the first pin 7 at the rear end of the heating tube 5, and the placement groove 114 is arranged on the rear side of the base 11, so that when the heating tube 5 is powered on and heats up to make the first temperature sensor 3 melt, the second temperature sensor 4 senses the temperature of the heating tube 5 and melts due to the heat, so as to prevent the heating tube 5 from continuing to heat up and realize circuit cutting. The first pin 7 at the rear end of the heating tube 5 of this embodiment can also bypass the side of the heating tube 5 and extend from the front side of the shell 10 to be arranged side by side with the second pin 8 at the front end of the heating tube 5, so as to facilitate circuit connection and installation.

[0050] In summary, the controlled fuse of the utility model can achieve timely melting and avoid false melting by arranging the first temperature sensing body 3 to be directly fitted with the heating tube 5; the insulating heat-shielding sheet 6 is arranged to prevent the heat generated by the heating tube 5 from damaging the first electrode sheet 1, the second electrode sheet 2 and the shell 10; and the heating tube 5 can adopt a circular tube, which generates heat evenly and can prevent the heating tube 5 from bursting, thereby greatly improving the safety performance of the product.

[0051] The above is only a preferred embodiment of the utility model, and the protection scope of the utility model is not limited to the above embodiments. All technical solutions under the idea of ​​the utility model belong to the protection scope of the utility model. It should be pointed out that for ordinary technicians in this technical field, equivalent changes and modifications without departing from the principle of the utility model should still fall within the protection scope of the utility model.

[0052] In the description of the embodiments of the present application, it should be understood that the indicated orientation or position relationship is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the product of the application is usually placed when in use, or is the orientation or position relationship commonly understood by technical personnel in this field. It is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0053] In addition, the terms "first", "second", "third", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "multiple" and "several" is two or more, unless otherwise clearly and specifically defined.

Claims

1. A controlled fuse, characterized in that: It includes a first electrode sheet, a second electrode sheet, a first temperature sensing body, a second temperature sensing body, a heating tube and an insulating heat-insulating sheet; The first temperature sensor is located between the first electrode sheet and the second electrode sheet, two ends of the first temperature sensor are respectively connected to the first electrode sheet and the second electrode sheet, and the first temperature sensor is close to the heating tube; The surface and surrounding of the first temperature sensing body are coated with flux; The heating tube is also located between the first electrode sheet and the second electrode sheet, and the insulating heat-insulating sheet is arranged between the heating tube and the first electrode sheet and the second electrode sheet for separation; The heating tube is connected to a first pin and a second pin, and the second temperature sensor is connected in series to the first pin.

2. A controlled fuse according to claim 1, characterized in that: It also includes a shell consisting of a base and an upper cover; the first temperature sensor, the second temperature sensor, the heating tube and the insulating heat-insulating sheet are all installed in the shell; the inner ends of the first electrode sheet, the second electrode sheet and the first pin and the second pin are all located in the shell, and the outer ends are all extended out of the shell.

3. A controlled fuse according to claim 2, characterized in that: The first electrode sheet and the second electrode sheet are located on the left and right sides of the heating tube; the first temperature sensor is closely arranged on the upper side of the heating tube, and the insulating heat-insulating sheet is arranged around the left, right and lower sides of the heating tube, so that the heating tube is not in direct contact with the shell.

4. A controlled fuse according to claim 3, characterized in that: The heating tube is a circular tube extending axially forward and backward; the first temperature sensing body is an arc-shaped sheet and is closely attached to the outer wall on the upper side of the heating tube; the insulating heat-insulating sheet is an arc-shaped sheet and covers the remaining outer walls on the left, right and lower sides of the heating tube; an arc-shaped portion is formed at one adjacent end of the first electrode sheet and the second electrode sheet respectively, the two arc-shaped portions are symmetrical to each other, and the two arc-shaped portions are respectively attached to the left and right sides of the insulating heat-insulating sheet, and the upper ends of the two arc-shaped portions are respectively connected to the two ends of the first temperature sensing body.

5. A controlled fuse according to claim 4, characterized in that: The first electrode sheet and the second electrode sheet are installed on the base, and a heat dissipation space is formed between the base and the upper cover; the two arc-shaped parts, the heating pipe and the first temperature sensing body are located in the middle of the heat dissipation space.

6. A controlled fuse according to claim 1, characterized in that: The first electrode sheet and the second electrode sheet are distributed on the left and right; there are a plurality of first temperature sensors, which are arranged at intervals along the front-to-back direction, and each first temperature sensor is connected to the first electrode sheet and the second electrode sheet respectively; the flux is coated between adjacent first temperature sensors.

7. A controlled fuse according to claim 2, characterized in that: A group of multiple protrusions are provided on the left and right sides of the top of the base; the first electrode sheet and the second electrode sheet are respectively installed on the left and right sides of the top of the base, and the first electrode sheet and the second electrode sheet are respectively provided with a plurality of positioning holes for each protrusion to pass through for positioning.

8. A controlled fuse according to claim 7, characterized in that: The left and right sides of the top of the base are provided with notches connected to the outside world on the outer sides of each group of convex columns; the left and right sides of the bottom of the upper cover are respectively formed with bosses; the top of the base is concavely provided with a plurality of slots, and the bottom of the upper cover is convexly provided with a plurality of hooks, and when the upper cover and the base are fastened together, the hooks are hooked in the slots, and the bosses extend into the notches and press the first electrode sheet and the second electrode sheet.

9. A controlled fuse according to claim 2, characterized in that: The shell body is provided with an independent placement groove for placing the second temperature sensing body.

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