New energy equipment temperature overheating protection circuit breaker

Abstract

The invention discloses a new energy equipment temperature overheating protection circuit breaker. The circuit breaker comprises a lower structure base; the upper cover structural member and the lower structural base are arranged at the top of the lower structural base; the contact piece assembly is arranged in a space formed by the lower structure base and the upper cover structural member, the contact piece assembly comprises a static conductive contact piece and a movable conductive reed located above the static conductive contact piece, a static contact is fixedly connected to the top of the static conductive contact piece, a movable contact is fixedly connected to the position, corresponding to the static contact, of the bottom of one end of the movable conductive reed, and the movable contact is fixedly connected to the position, corresponding to the movable contact, of the bottom of the other end of the movable conductive reed. The beneficial effects of the invention are that: firstly, the large-diameter bimetallic strip is adopted, so that the elastic force is increased, the elastic height is increased, enough force is provided for ejecting the conductive contact, and the opening distance of the contact gap is enough; secondly, a large-area and large-thickness silver alloy contact is adopted, so that large current can be safely conducted, and the number of times of service life is increased; and thirdly, large-width beryllium copper (movable contact spring / static contact spring) is adopted for conduction, and reliable diversion stability is provided for a heavy load.

Description

Technical Field

[0001] The present invention relates to the technical field of overheat protection circuit breakers, and in particular to a new energy equipment temperature overheat protection circuit breaker. Background Art

[0002] When it comes to high-temperature protection for new energy products, the industrial control program is used to control the circuit cut-off during the operation of related equipment. The NTC temperature sensor collects the temperature value. If the program detects that the temperature is too high, the collected data information is fed back to the MCU in the controller PLC. The MCU sends a command to the large-load relay of the component, and the magnetic effect action mechanism of the coil in the relay disconnects the power supply. This solution is the mainstream design control, which has a high cost and complex circuit. Due to the delay in the NTC temperature sensor collecting information to the industrial control, the stability of the PLC electronic components and the overload capacity of the relay and other components, the related equipment that heats up rapidly will be misjudged or delayed, and the circuit cannot be effectively and securely cut off, resulting in safety accidents and even fires, which are unavoidable for current new energy equipment. Summary of the invention

[0003] The object of the present invention is to provide a new energy equipment temperature overheating protection circuit breaker to solve the problems raised in the above background technology.

[0004] To achieve the above object, the present invention provides the following technical solution: a new energy equipment overheat protection circuit breaker, comprising:

[0005] Lower structure base;

[0006] An upper cover structure, a lower structure base is placed on top of the lower structure base;

[0007] A contact assembly, the contact assembly is placed in the space formed by the lower structure base and the upper cover structure, the contact assembly includes a static conductive contact and a dynamic conductive spring located above the static conductive contact, the top of the static conductive contact is fixedly connected to a static contact, the bottom of one end of the dynamic conductive spring is fixedly connected to a position corresponding to the static contact, a convex point of a conical structure is provided in the middle of the dynamic conductive spring, and a bimetallic temperature piece is provided below the convex point;

[0008] The insulating part is placed between the moving conductive spring and the bimetallic temperature piece and is used for insulation between the moving conductive spring and the bimetallic temperature piece.

[0009] Preferably, a copper stud is inserted into one end of the upper cover structure, one end of the dynamic conductive spring is sleeved on the outside of the copper stud, and the bottom of the copper stud is threadedly connected with a copper screw cap for fastening the dynamic conductive spring.

[0010] Preferably, a second copper stud is inserted into the end of the upper cover structure away from the first copper stud, the static conductive contact piece is sleeved on the outside of the second copper stud, and the bottom of the second copper stud is threadedly connected with a second copper screw cap for fastening the static conductive contact piece.

[0011] Preferably, the insulating portion includes a PI insulating film 1 and a PI insulating film 2, and the PI insulating film 1 is stuck at the bottom of the dynamic conductive spring.

[0012] Preferably, the bimetallic temperature plate is fixedly connected to the bottom of the inner wall of the lower structure base, and the top of the bimetallic temperature plate is fixedly connected with a PI insulating film 2.

[0013] Preferably, the convex point in the middle of the dynamic conductive spring is in contact with the bimetallic temperature plate through PI insulating film 1 and PI insulating film 2.

[0014] Preferably, a plurality of hot-melt plastic columns are fixedly connected to the top of the lower structure base, and a plurality of positioning holes are arranged in the upper cover structure at positions corresponding to the hot-melt plastic columns.

[0015] Compared with the prior art, the present invention has the following beneficial effects: first, a large true diameter bimetallic strip is used to increase the elastic force and the spring height, so that there is enough force to push open the conductive contact and the contact gap is opened to a sufficient distance; second, a large area and thick silver alloy contact is used to safely conduct a large current and increase the number of working lifespans; third, a large width beryllium copper conductor (moving spring / static contact) is used to provide reliable conduction stability for large loads; fourth, the design uses double copper screws to lock the copper busbar, which can increase the conductive area and avoid insufficient conductivity of a single busbar, causing heat. It has a copper screw locking device, which can better fix the strength of the copper busbar and is not easy to loosen during the conductive process, thus avoiding overheating; fifth, a double layer of insulating paper is provided inside to increase the surface electrical gap and creepage distance and enhance the insulation performance; sixth, the large diameter bimetallic strip is a hollow design, so that the temperature sensing piece is exposed to the temperature control body, and the heating layer can be placed on top during installation. During the temperature sensing process, the temperature rise is synchronized with the heating layer, and a quick response can be made to speed up the circuit disconnection time; Seventh, the bimetallic strip action support point and the contact opening point, including the movable spring piece, are designed as a right-angled triangle trigger. Through the calculation formula of the Pythagorean theorem and the physical lever principle, when the bimetallic strip is actuated, the contact can be quickly opened, and the dynamic / static contact is guaranteed to have an opening distance of more than 3.6 mm, which can meet the relevant national standards. Eighth, the present application adopts an upper and lower mutual control structure. After packaging, the internal related components are very compact to ensure that when a large current passes through, no current micro-swing will be generated, thereby causing excessive heat. Ninth, the structure of the present application refers to the national standard requirements and meets the creepage distance, electrical clearance, withstand voltage insulation strength requirements and other conditions for long-term stable operation. Through the above-mentioned structural design requirements, the overheating circuit breaker can be realized, so that the periodic structure is compact, the volume is small, the size is thin, the reaction action is fast, the contact opening gap is large, the temperature control range is wide, the arc discharge performance is good, the insulation strength is high, the conductivity is good, the high power and high current application, the load is large, and the current protection measures for new energy equipment applications are blank. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the present invention;

[0017] Figure 2 It is a structural schematic diagram of the present invention;

[0018] Figure 3 It is a schematic diagram of the structure of the present invention.

[0019] In the figure: 1. Lower structural base; 2. Upper cover structural part; 3. One copper stud; 4. Moving conductive spring; 5. One PI insulating film; 6. One copper screw cap; 7. Bimetallic temperature piece; 8. Hot-melt plastic column; 9. Two PI insulating films; 10. Two copper screw caps; 11. Static contact; 12. Static conductive contact piece; 13. Moving contact; 14. Two copper studs. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] See also Figure 1 , 2 3, the present invention provides a technical solution: a new energy equipment temperature overheat protection circuit breaker, comprising: a lower structure base 1; the lower structure base 1 is placed on the top of the lower structure base 1; the contact assembly is placed in the space formed by the lower structure base 1 and the upper cover structure 2, the contact assembly includes a static conductive contact 12 and a dynamic conductive spring 4 located above the static conductive contact 12, the top of the static conductive contact 12 is fixedly connected to a static contact 11, the bottom of one end of the dynamic conductive spring 4 is fixedly connected to a position corresponding to the static contact 11, and the middle of the dynamic conductive spring 4 is provided with a conical structure. The structure has a convex point, and a bimetallic temperature piece 7 is arranged under the convex point; the insulating part is placed between the dynamic conductive spring piece 4 and the bimetallic temperature piece 7, and is used for insulation between the dynamic conductive spring piece 4 and the bimetallic temperature piece 7. By adding a mechanical safety protection wall, the circuit can be physically and mechanically cut off in the event of failure of the industrial control PLC, making the new energy equipment safer and more reliable. For example, in the battery pack of a new energy vehicle, the product of this application is connected and applied. When abnormal charging or discharging high temperature occurs, the circuit can be quickly cut off, so that a group of abnormal battery packs will no longer heat up, thereby avoiding safety accidents.

[0022] It should be noted that the moving contact 13 of the present invention is welded on the moving conductive spring 4 to realize the moving conductive spring 4-shaped action component. The moving conductive spring 4 has a convex point design. The height parameter of this convex point needs to be set, which corresponds to the center point of the bimetallic temperature plate 7. After the entire product structure is formed, the bimetallic temperature plate 7 is reversely deformed to open, so that the moving contact 13 on the moving conductive spring 4 is also reversely opened, and it is no longer closed with the static contact 11, so as to realize the conductive disconnection of the moving / static contact 11; the static contact 11 is welded with the static conductive contact 12 to realize the static conductive component. The mechanical physical structure of the thermal protector is to set an overheating protection disconnect circuit for abnormal temperatures of new energy equipment to avoid safety accidents. The bimetallic strip has a large elastic force and a wide temperature range. It is affected by the set protection temperature and uses the thermal expansion and contraction principle of the bimetallic strip to quickly disconnect the circuit with a large elastic force, so that the internal contacts are in an open circuit state. When the temperature reaches a safe value and cools down, the bimetallic strip will automatically reset / or cannot be reset and manually reset manually, thereby realizing a mechanical overheating protection function. The technological breakthrough of this product lies in the application of DC / AC high voltage and current loads, such as DC100V100A~DC800V100A. It can directly power on and disconnect the circuit when the temperature is too high. The biggest feature is the lever principle design, which allows the contact disconnection gap to exceed the safety requirement of 3.6mm. It adopts large contacts, large-width movable springs, screw-locked wires, upper / lower tight buckling structures, etc., and is designed with wide creepage distance, insulation gap, enhanced insulation layer, etc.; this overheat protection circuit breaker has the advantages of compact size, large overload, bimetallic strip not affected by current, and fast action while meeting performance requirements.

[0023] See also Figure 1 , 3 As shown, a copper stud 3 is inserted into one end of the upper cover structure 2, one end of the dynamic conductive spring 4 is sleeved on the outside of the copper stud 3, and the bottom of the copper stud 3 is threadedly connected with a copper screw cap 6 for fastening the dynamic conductive spring 4, and a copper stud 2 14 is inserted into the end of the upper cover structure 2 away from the copper stud 3, and the static conductive contact 12 is sleeved on the outside of the copper stud 2 14, and the bottom of the copper stud 2 14 is threadedly connected with a copper screw cap 2 10 for fastening the static conductive contact 12, and the insulating part includes a PI insulating film 15 and a PI insulating film 29, and the PI insulating film 5 is stuck at the bottom of the dynamic conductive spring 4, and the bimetallic temperature piece 7 is fixedly connected to the bottom of the inner wall of the lower structure base 1, and the top of the bimetallic temperature piece 7 is fixedly connected with the PI insulating film 29, and the convex point in the middle of the dynamic conductive spring 4 contacts the bimetallic temperature piece 7 through the PI insulating film 15 and the PI insulating film 29.

[0024] It should be noted that the PI insulating film 1 and the PI insulating film 2 of the present invention, as between the dynamic conductive reed 4 and the bimetallic temperature piece 7, are used to provide insulation between the bimetallic temperature piece 7 and the dynamic reed. The PI film has high high-temperature resistant insulation strength and is an excellent insulating material; the bimetallic temperature piece 7 is placed close to the top in the internal structure, and is the core thermally sensitive sensing physical material component of the entire component. When the set temperature value is reached, the bimetallic temperature piece 7 is heated and reversely deformed to achieve the mechanism of pushing the dynamic conductive reed 4; the PI insulating film 1 and the PI insulating film 2, as between the dynamic conductive reed 4 and the bimetallic temperature piece 7, are used to provide insulation between the bimetallic temperature piece 7 and the dynamic reed. The PI film has high high-temperature resistant insulation strength and is an excellent insulating material; the bimetallic temperature piece 7 is placed close to the top in the internal structure, and is the core thermally sensitive sensing physical material component of the entire component. When the set temperature value is reached, the bimetallic temperature piece 7 is heated and reversely deformed to achieve the mechanism of pushing the dynamic conductive reed 4.

[0025] See also Figure 1 As shown, a plurality of hot melt plastic columns 8 are fixedly connected to the top of the lower structure base 1 , and a plurality of positioning holes are arranged in the upper cover structure 2 at positions corresponding to the hot melt plastic columns 8 .

[0026] It should be noted that the materials of the upper cover structural member 2 and the lower structure base 1 of the present invention can be divided into ceramic parts and engineering plastic parts, among which ceramic parts need to be fastened by rivets, while engineering plastic parts can be fastened by hot-melt guide columns. The structural members are provided with fixed rivet holes and a pressing structure according to the working requirements of the product, and are designed with a pressure-activated conductive spring sheet 4 and a static contact sheet top column and a groove matching structure. When the upper / lower cover structures are combined, the related components are tightly fastened and the conductive performance is stable. The lower cover structure is designed to be hollowed out, so that the bimetallic temperature plate 7 can be exposed to the outside. When it is close to the heat source installation surface, it is almost flush with the surface position, so that the bimetallic temperature plate 7 is close to the heat source to achieve the synchronization requirements of the reaction speed and the heating speed, and the action structure forms a function to realize the temperature control. After the upper / lower structure is tightened, the product assembly is completed.

[0027] This application adds a mechanical over-temperature protection to products related to new energy equipment, so as to improve reliability and safety, and reduce the fire accidents of new energy. The application product is based on the relevant design indicators of the reference national standard GB / T 7251.1-2022, to meet the mechanical control switch of new energy equipment with voltage below DC / AC800V and current below 100A, which solves the gap of mechanical overheating circuit breaker safety protector for high-power application of new energy equipment, and brings more direct protection to new energy related equipment. It responds quickly and can be physically controlled and protected without combining with electronic control. For example, in the application fields of new energy vehicles, new energy charging piles, storage power supplies, and motor vehicle control equipment below DC800V, when the temperature is abnormally high, this application technology can cut off the circuit to avoid causing excessive temperature or even spontaneous combustion, bringing safety to the equipment. This product does not need to rely on other electronic controls, the control is simple and effective, the cost is low, and it can be matched in large quantities, just like the temperature control switch or fuse in household appliances, to provide terminal protection for new energy equipment.

[0028] In the description of the present invention, it is necessary to understand that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "both ends" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do 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 should not be understood as a limitation on the present invention.

[0029] In addition, the terms "first", "second", "third" and "fourth" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first", "second", "third" and "fourth" may explicitly or implicitly include at least one of such features.

[0030] In the present invention, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; 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, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A new energy equipment overheat protection circuit breaker, characterized in that: include: Lower structure base (1); An upper cover structure (2), a lower structure base (1) is placed on top of the lower structure base (1); A contact piece assembly, the contact piece assembly is placed in a space formed by the lower structure base (1) and the upper cover structure (2), the contact piece assembly comprises a static conductive contact piece (12) and a dynamic conductive spring piece (4) located above the static conductive contact piece (12), the top of the static conductive contact piece (12) is fixedly connected to a static contact point (11), the bottom of one end of the dynamic conductive spring piece (4) is fixedly connected to a dynamic contact point (13) at a position corresponding to the static contact point (11), a convex point of a conical structure is provided in the middle of the dynamic conductive spring piece (4), and a bimetallic temperature piece (7) is provided below the convex point; The insulating part is placed between the moving conductive spring piece (4) and the bimetallic temperature piece (7) and is used for insulation between the moving conductive spring piece (4) and the bimetallic temperature piece (7).

2. A new energy equipment overheat protection circuit breaker according to claim 1, characterized in that: A copper stud (3) is inserted into one end of the upper cover structure (2), one end of the dynamic conductive spring (4) is sleeved on the outside of the copper stud (3), and the bottom of the copper stud (3) is threadedly connected with a copper screw cap (6) for fastening the dynamic conductive spring (4).

3. A new energy equipment overheat protection circuit breaker according to claim 1, characterized in that: A copper stud 2 (14) is inserted into the end of the upper cover structure (2) away from the copper stud 1 (3); the static conductive contact piece (12) is sleeved on the outside of the copper stud 2 (14); and the bottom of the copper stud 2 (14) is threadedly connected with a copper screw cap 2 (10) for fastening the static conductive contact piece (12).

4. A new energy equipment overheat protection circuit breaker according to claim 1, characterized in that: The insulating part comprises a PI insulating film 1 (5) and a PI insulating film 2 (9), and the PI insulating film 1 (5) is stuck on the bottom of the dynamic conductive spring sheet (4).

5. A new energy equipment overheat protection circuit breaker according to claim 4, characterized in that: The bimetallic temperature plate (7) is fixedly connected to the bottom of the inner wall of the lower structure base (1), and the top of the bimetallic temperature plate (7) is fixedly connected with a PI insulating film 2 (9).

6. A new energy equipment overheat protection circuit breaker according to claim 5, characterized in that: The convex point in the middle of the dynamic conductive spring sheet (4) contacts the bimetallic temperature sheet (7) through the PI insulating film 1 (5) and the PI insulating film 2 (9).

7. A new energy equipment overheat protection circuit breaker according to claim 1, characterized in that: A plurality of hot-melt plastic columns (8) are fixedly connected to the top of the lower structure base (1), and a plurality of positioning holes are arranged in the upper cover structure (2) at positions corresponding to the hot-melt plastic columns (8).

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