Battery thermal management system and temperature fuse thereof

Abstract

The invention provides a battery thermal management system and a thermal fuse thereof, and relates to the technical field of fuses. The temperature fuse comprises a shell provided with a first cavity and a second cavity, a temperature sensing assembly arranged in the first cavity, a fuse wire arranged in the second cavity, a first electrode piece connected to one end of the temperature sensing assembly and one end of the fuse wire respectively, and a second electrode piece connected to the other end of the temperature sensing assembly and the other end of the fuse wire respectively. The first cavity is provided with special resin; arc extinguishing particles are distributed in the second cavity; the temperature sensing assembly comprises a temperature sensing conductor or at least two temperature sensing conductors which are connected in series through a connecting conductor. According to the temperature fuse, quick response and protection on temperature and current abnormity in a battery thermal management system are realized, and the safety and reliability of the system are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of fuses, and in particular to a battery thermal management system and a temperature fuse thereof. Background Art

[0002] The battery thermal management system of electric vehicles has a significant impact on battery performance and vehicle driving distance. However, there are some technical problems with the temperature fuse in the existing battery thermal management system.

[0003] Specifically, when the thermal management system is out of control and the heating temperature rises abnormally above the set value, the temperature fuse needs to quickly melt to actively cut off the heating circuit to ensure the safety of the entire circuit. However, under conditions of high DC voltage and high current, conventional temperature fuses cannot meet the increasingly high application requirements of the new energy market. Ordinary temperature fuses usually use the tension provided by special resins to break the alloy, thereby disconnecting the circuit. However, this method has the problem of slow disconnection speed, and the disconnection time is usually in seconds. Under conditions of high DC voltage and high current, the disconnection time is required to reach the millisecond level, otherwise the huge energy impact of the instantaneous arc may cause the product to explode.

[0004] In addition, at the moment of arcing, the special resin of ordinary temperature fuses can absorb part of the arc energy and play a role in assisting arc extinguishing. However, under the conditions of high DC voltage and high current, the degree of arc cooling and arc thermal ionization effect is limited, and the arc extinguishing ability is poor, which cannot meet the actual application requirements. At the same time, the insulation withstand voltage capacity of the product after disconnection is insufficient, and there is a risk of breakdown under high voltage conditions.

[0005] In summary, the temperature fuses in the existing battery thermal management system have problems such as slow disconnection speed, insufficient arc extinguishing ability and weak insulation withstand voltage under high DC voltage and high current conditions, which need to be improved urgently. Summary of the invention

[0006] The present invention provides a battery thermal management system and a temperature fuse thereof, aiming to improve at least one of the above technical problems.

[0007] In order to solve the above technical problems, the present invention provides a temperature fuse of a battery thermal management system, which includes a shell provided with a first chamber and a second chamber, a temperature sensing component arranged in the first chamber, a fuse arranged in the second chamber, a first electrode member respectively connected to one end of the temperature sensing component and the fuse, and a second electrode member respectively connected to the other end of the temperature sensing component and the fuse. The first chamber is provided with a special resin. The second chamber is provided with arc extinguishing particles. The temperature sensing component includes a temperature sensing conductor, or at least two temperature sensing conductors connected in series using a connecting conductor.

[0008] The first electrode and the second electrode are obtained by a stamping and shaping process.

[0009] As a further solution of the present invention, the resistance of the temperature-sensing conductor is lower than the resistance of the fuse, the melting point of the temperature-sensing conductor is lower than the melting point of the fuse, and the melting point of the special resin is not higher than the melting point of the temperature-sensing conductor, so that when the operating temperature of the temperature fuse is lower than the melting point of the temperature-sensing conductor, the current of the temperature-sensing conductor can be greater than the current of the fuse, and when the operating temperature of the temperature fuse is higher than the melting point of the temperature-sensing conductor, the temperature-sensing conductor can be melted first so that all the current flows through the fuse and then the fuse is melted.

[0010] As a further solution of the present invention, the length of the second chamber is longer than the length of the first chamber. The length of the fuse is longer than the length of the temperature-sensitive conductor. The length of the fuse is 1.2 to 4 times the length of the temperature-sensitive conductor.

[0011] The temperature sensing component is arranged in the first chamber along the length direction of the first chamber. The fuse is arranged in the second chamber along the length direction of the second chamber. The length direction of the first chamber and the length direction of the second chamber are configured to be the same direction.

[0012] As a further solution of the present invention, the temperature fuse further comprises an arc extinguishing member. The arc extinguishing member is suitable for cooperating with the first chamber to at least wrap a portion of the temperature-sensitive conductor.

[0013] The first chamber is provided with a first arc-extinguishing rib. The arc-extinguishing member is provided with a second arc-extinguishing rib. A conductor channel for the temperature-sensing conductor to pass through is formed between the first arc-extinguishing rib and the second arc-extinguishing rib.

[0014] As a further solution of the present invention, the first chamber is provided with a plurality of the first arc-extinguishing ribs at intervals, the arc-extinguishing member is provided with a plurality of the second arc-extinguishing ribs at intervals, and the plurality of the first arc-extinguishing ribs and the plurality of the second arc-extinguishing ribs correspond one to one.

[0015] The connecting conductor is provided with a first connecting groove for connecting to the temperature-sensing conductor. The connecting conductor is arranged between two first arc-extinguishing ribs.

[0016] The first electrode member is provided with a second connection groove connected to the temperature-sensing conductor. The second electrode member is provided with a third connection groove connected to the temperature-sensing conductor.

[0017] As a further solution of the present invention, the temperature fuse further comprises a first cover plate. The first cover plate is adapted to cooperate with the second chamber to enclose the fuse. The first cover plate is provided with a first electrode hole for the first electrode member to pass through, and a second electrode hole for the second electrode member to pass through.

[0018] At least a portion of the first electrode member is configured to extend along a side of the first cover plate away from the second chamber to the first electrode hole.

[0019] As a further solution of the present invention, the first cover plate is further provided with a particle filling hole for filling the arc-extinguishing particles into the second chamber.

[0020] The particle filling hole is connected to the second electrode hole.

[0021] The thermal fuse further includes a second cover plate for sealing the particle filling hole.

[0022] A plurality of protrusions are arranged on a side of the first cover plate away from the second chamber.

[0023] As a further solution of the present invention, the housing further comprises a third chamber and a fourth chamber. The first electrode member extends from the third chamber to one end of the first chamber and the second chamber and is joined to the temperature sensing component and the fuse. The second electrode member extends from the fourth chamber to the other end of the first chamber and the second chamber and is joined to the temperature sensing component and the fuse.

[0024] The temperature fuse further comprises a first electronic wire and a second electronic wire. At least a portion of the first electronic wire is embedded in the third chamber to be joined to the first electrode member. At least a portion of the second electronic wire is embedded in the fourth chamber to be joined to the second electrode member.

[0025] As a further solution of the present invention, the temperature fuse further includes epoxy resin arranged in openings of the first chamber, the second chamber, the third chamber, and the fourth chamber.

[0026] The arc extinguishing particles are quartz sand, ceramic particles or mica.

[0027] The temperature-sensitive conductor is an alloy-type temperature fuse.

[0028] The present application further provides a battery thermal management system, which includes a temperature fuse of a battery thermal management system as described in any paragraph of the first aspect.

[0029] By adopting the above technical solution, the present invention can achieve the following technical effects: The thermal fuse of a battery thermal management system of the present invention realizes rapid response and protection to temperature and current anomalies in the battery thermal management system, and improves the safety and reliability of the system. By optimizing the structural layout of the temperature sensing component and the fuse, enhancing the arc extinguishing capability, improving the sealing performance, and enhancing the insulation withstand voltage capability, the technology effectively prevents the risk of battery overheating and arc generation, prolongs the battery life, and ensures the safe operation of electric vehicles under various conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the specific embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 It is an axonometric view of a thermal fuse.

[0032] Figure 2 This is an exploded diagram of a thermal fuse.

[0033] Figure 3 It is an exploded view of the conductive components inside the thermal fuse (including the first electrode, the second electrode, the temperature sensing component and the fuse).

[0034] Figure 4 It is an axonometric view of the shell.

[0035] Figure 5 This is an axonometric view of the first cover.

[0036] Figure 6 This is an axonometric view of the second cover.

[0037] Figure 7 It is an axonometric view of the arc extinguishing component.

[0038] Figure 8 It is an axonometric view of the conductive components inside the thermal fuse.

[0039] Fig. 9 is an axonometric view of the first electrode member.

[0040] Fig.10 is an axonometric view of the second electrode member.

[0041] Fig.11 It is an axonometric view of the temperature sensing component.

[0042] Fig.12 It is an axonometric view of the temperature fuse of the second embodiment.

[0043] Fig.13It is a first explosion diagram of the temperature fuse of the second embodiment.

[0044] Fig.14 It is a second explosion diagram of the thermal fuse of the second embodiment.

[0045] Markings in the figure: 1-shell, 2-fuse, 3-first electrode member, 4-first cover plate, 5-epoxy resin, 6-second cover plate, 7-arc extinguishing member, 8-temperature sensing component, 9-second electrode member, 10-first electronic wire, 11-second electronic wire, 12-first arc extinguishing rib, 13-third chamber, 14-first chamber, 15-second chamber, 16-fourth chamber, 17-second electrode hole, 18-particle filling hole, 19-protrusion, 20-first electrode hole, 21-second arc extinguishing rib, 22-first limiting part, 23-second limiting part, 24-second connecting groove, 25-third limiting part, 26-fourth limiting part, 27-third connecting groove, 28-connecting conductor, 29-temperature sensing conductor, 30-first connecting groove, 31-first shell, 32-second shell, 33-third shell. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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 making creative work are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention claimed for protection, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0047] Embodiment 1: Figures 1 to 11 As shown, an embodiment of the present invention provides a temperature fuse of a battery thermal management system, which includes a shell 1 provided with a first chamber 14 and a second chamber 15, a temperature sensing component 8 arranged in the first chamber 14, a fuse 2 arranged in the second chamber 15, a first electrode member 3 respectively connected to one end of the temperature sensing component 8 and the fuse 2, and a second electrode member 9 respectively connected to the other end of the temperature sensing component 8 and the fuse 2. The first chamber 14 is provided with a special resin. The second chamber 15 is provided with arc extinguishing particles. The first electrode and the second electrode are obtained by stamping and shaping process.

[0048] The temperature sensing component 8 includes at least two temperature sensing conductors 29 arranged in series, and a connecting conductor 28 for connecting two adjacent temperature sensing conductors 29. The series connection of two or more temperature sensing conductors 29 has the following advantages: 1. Reducing the voltage value at each breakpoint, thereby reducing the arc starting point energy and extinguishing the arc faster. 2. The arc starting points increase, the arc length increases, more arc energy is consumed, and the arc is extinguished faster. 3. The multi-breakpoint method improves the insulation withstand voltage capability of the product. Preferably, the fuse 2 is formed by connecting multiple sections in series, so as to obtain the same arc extinguishing effect as the temperature sensing component 8.

[0049] In this embodiment, the temperature-sensing conductor 29 is made of a low internal resistance material and is sensitive to temperature. When the temperature-sensing conductor 29 reaches the specified temperature, it will melt into a liquid state and shrink to both sides into a ball under the tension of the special grease, thereby disconnecting the circuit. The fuse 2 is made of a high resistance material and is sensitive to the current value. When the circuit exceeds the set current value, the fuse 2 melts and disconnects itself due to the large internal resistance and the rapid increase in temperature. Under the combined action of the internal tension and the arc-extinguishing particles, the circuit is disconnected more quickly.

[0050] Preferably, the temperature-sensing conductor 29 is an alloy-type temperature fuse. The alloy-type temperature fuse (ATCO) is a low-melting-point fusible alloy used as a temperature-sensing material. When abnormal heating occurs and a predetermined fuse temperature is reached, the fusible alloy melts and quickly shrinks to both ends of the pin under the action of a special resin (i.e., a flux), thereby disconnecting the circuit. Depending on the different formulations, the weight percentage composition of the flux can be: rosin: 60%-80%, shrinking agent: 5%-15%, activator: 5%-15%, curing agent: 4%-8%. The flux (i.e., special resin) is an existing material, and those skilled in the art can select specific specifications as needed. The present invention does not specifically limit the composition and production steps of the flux, but only requires that the melting point of the special resin is lower than that of the temperature-sensing conductor 29.

[0051] A temperature fuse of a battery thermal management system of the present invention can respond quickly when the temperature is abnormal by setting a first chamber 14 and a second chamber 15, and arranging a temperature sensing component 8 and a fuse 2, and can cut off the circuit by fusing the temperature sensing conductor 29, thereby effectively preventing the battery from overheating and improving the safety and reliability of the battery thermal management system.

[0052] On the basis of the above embodiments, in an optional embodiment of the present invention, the resistance of the temperature-sensing conductor 29 is lower than the resistance of the fuse 2, the melting point of the temperature-sensing conductor 29 is lower than the melting point of the fuse 2, and the melting point of the special resin is not higher than the melting point of the temperature-sensing conductor 29, so that when the operating temperature of the temperature fuse is lower than the melting point of the temperature-sensing conductor 29, the current of the temperature-sensing conductor 29 can be greater than the current of the fuse 2, and when the operating temperature of the temperature fuse is higher than the melting point of the temperature-sensing conductor 29, the temperature-sensing conductor 29 can be melted first so that all the current flows through the fuse 2 and then the fuse 2 is melted.

[0053] Preferably, the melting point of the special resin is lower than the melting point of the temperature-sensing conductor 29, so that it melts before the temperature-sensing conductor 29 melts, and better provides surface tension for the disconnection of the temperature-sensing conductor 29. By designing the resistance and melting point of the temperature-sensing conductor 29 to be lower than the fuse 2, it is ensured that when the operating temperature is lower than the melting point of the temperature-sensing conductor 29, the temperature-sensing conductor 29 can carry a larger current and work normally, and when the temperature exceeds the melting point, the temperature-sensing conductor 29 melts before the fuse 2, thereby achieving rapid response and protection, and reducing the risk of battery damage caused by abnormal temperature. And when the temperature-sensing conductor 29 melts, the current is transmitted through the fuse 2, avoiding the generation of an arc at the temperature-sensing conductor 29, eliminating the safety hazard of arc generation in the prior art.

[0054] Based on the above embodiments, in an optional embodiment of the present invention, as Figures 2 to 4 ,as well as Figure 8 As shown, the length of the second chamber 15 is longer than the length of the first chamber 14. The length of the fuse 2 is longer than the length of the temperature-sensing conductor 29. The length of the fuse 2 is 1.2 to 4 times the length of the temperature-sensing conductor 29.

[0055] The temperature sensing component 8 is arranged in the first chamber 14 along the length direction of the first chamber 14. The fuse 2 is arranged in the second chamber 15 along the length direction of the second chamber 15. The length direction of the first chamber 14 and the length direction of the second chamber 15 are configured to be the same direction.

[0056] In one optional solution, the temperature sensing conductor 29 is 12 mm and the fuse is 233 mm. The length of the fuse 2 is 2.75 times the length of the temperature sensing conductor 29. In another optional solution, the temperature sensing conductor 29 is 19.4 mm (effective length: 17.74 mm) and the length of the fuse 2 is 30 mm. The fuse 2 is 1.55 (effective length multiple: 1.69) times the length of the temperature sensing conductor 29. The effective length is the difficulty of the temperature sensing component 8 between the first electrode 3 and the second electrode 9, excluding the length welded to the first electrode 3 and the second electrode 9.

[0057] The present invention optimizes the structural design of the temperature fuse by adjusting the length of the second chamber 15 and the fuse 2. The resistance of the fuse 2 is effectively increased, so that the current flowing through the fuse 2 is reduced when the temperature is normal, and the temperature rises and burns out more quickly after the temperature sensing component 8 is disconnected, and the power supply is quickly disconnected, thereby reducing the risk of the fuse and improving the response speed of the fuse.

[0058] Based on the above embodiments, in an optional embodiment of the present invention, as Figure 2 and Figure 7 As shown, the temperature fuse further includes an arc extinguishing member 7. The arc extinguishing member 7 is suitable for cooperating with the first chamber 14 to at least wrap a portion of the temperature-sensing conductor 29. The first chamber 14 is provided with a first arc extinguishing rib 12. The arc extinguishing member 7 is provided with a second arc extinguishing rib 21. A conductor channel for the temperature-sensing conductor 29 to pass through is formed between the first arc extinguishing rib 12 and the second arc extinguishing rib 21.

[0059] The second arc-extinguishing rib 21 of the arc-extinguishing member 7 abuts against the first arc-extinguishing rib 12 of the first chamber 14, completely wrapping the temperature-sensing conductor 29. When the arc-extinguishing effect of the fuse 2 is not ideal, the temperature-sensing conductor 29 can cut off and cool the arc through the first arc-extinguishing rib 12 and the second arc-extinguishing rib 21, which serves as a second structural design to assist in arc extinguishing. By adding the arc-extinguishing member 7 and the corresponding arc-extinguishing rib design, the present invention strengthens the arc-extinguishing ability of the temperature fuse. This structure can effectively wrap the temperature-sensing conductor 29, reduce the risk of arc generation, and improve the stability and safety of the battery thermal management system.

[0060] Preferably, the first chamber 14 is provided with a plurality of the first arc-extinguishing ribs 12 at intervals, and the arc-extinguishing member 7 is provided with a plurality of the second arc-extinguishing ribs 21 at intervals. The plurality of the first arc-extinguishing ribs 12 and the plurality of the second arc-extinguishing ribs 21 correspond one to one.

[0061] In this embodiment, the number of the first arc-extinguishing ribs 12 and the arc-extinguishing ribs is 4. In other embodiments, the number can be 1, 2 or other numbers. The present invention further optimizes the arc-extinguishing effect by arranging a plurality of arc-extinguishing ribs and a layout of the connecting conductor 28. This design not only improves the arc-extinguishing efficiency, but also enhances the structural stability and reliability of the product.

[0062] Based on the above embodiments, in an optional embodiment of the present invention, as Figure 2 , Figure 5 and Figure 6As shown, the temperature fuse further includes a first cover plate 4. The first cover plate 4 is adapted to cooperate with the second chamber 15 to enclose the fuse 2. The first cover plate 4 is provided with a first electrode hole 20 for the first electrode member 3 to pass through, and a second electrode hole 17 for the second electrode member 9 to pass through.

[0063] At least a portion of the first electrode member 3 is configured to extend along a side of the first cover plate 4 away from the second chamber 15 to the first electrode hole 20 .

[0064] The housing 1, the first cover plate 4, the arc extinguishing member 7 and the second cover plate 6 are all made of ceramic materials. Ceramic materials have excellent strength and thermal conductivity, making the product have better arc extinguishing performance and anti-burst performance. By designing the first cover plate 4 and the corresponding electrode holes, the present invention improves the assembly convenience and sealing of the temperature fuse. This design can effectively prevent the influence of the external environment on the internal components and prolong the service life of the product.

[0065] Based on the above embodiments, in an optional embodiment of the present invention, as Figure 2 , Figure 4 and Fig.11 As shown, the connecting conductor 28 is provided with a first connecting groove 30 for connecting to the temperature-sensing conductor 29. The connecting conductor 28 is arranged between two first arc-extinguishing ribs 12. The first electrode member 3 is provided with a second connecting groove 24 connected to the temperature-sensing conductor 29. The second electrode member 9 is provided with a third connecting groove 27 connected to the temperature-sensing conductor 29.

[0066] The first connection groove 30, the second connection groove 24, and the third connection groove 27 are all arc-shaped grooves, preferably semicircular grooves. The semicircular grooves can increase the contact area with the temperature-sensing conductor 29, ensure a firm connection, and reduce the resistance at the connection.

[0067] In addition, the first electrode member 3 is provided with a first connection end for passing through the first electrode hole 20 and engaging with the fuse 2, a first stopper 22 adapted to be clamped outside the first electrode hole 20, and a second stopper 23 adapted to be clamped to the housing 1. The second stopper 23 is used to be clamped to the cavity wall between the first cavity 14 and the second cavity 15, and to be clamped to the cavity wall between the first cavity 14 and the third cavity 13.

[0068] The second electrode is provided with a second connection end for passing through the second electrode hole 17 and engaging with the other end of the fuse 2, a third stopper 25 adapted to be clamped outside the second electrode hole 17, and a fourth stopper 26 adapted to be clamped to the housing 1. The fourth stopper 26 is used to be clamped to the cavity wall between the first cavity 14 and the second cavity 15.

[0069] Based on the above embodiments, in an optional embodiment of the present invention, as Figure 2 and Figure 5 As shown, the first cover plate 4 is further provided with a particle filling hole 18 for filling the arc extinguishing particles into the second chamber 15. The particle filling hole 18 is connected to the second electrode hole 17. The temperature fuse further includes a second cover plate 6 for sealing the particle filling hole 18.

[0070] The present invention provides the particle filling hole 18 in the first cover plate 4 to ensure the integrity of the housing 1. The particle filling hole 18 and the second cover plate 6 are provided to optimize the filling and fixing of arc extinguishing particles. This design not only improves the arc extinguishing efficiency, but also enhances the sealing and protection capabilities of the product.

[0071] Based on the above embodiments, in an optional embodiment of the present invention, as Figure 2 and Figure 4 As shown, the housing 1 further includes a third chamber 13 and a fourth chamber 16. The first electrode 3 extends from the third chamber 13 to the first chamber 14 and the second chamber 15 to be joined to one end of the temperature sensing component 8 and the fuse 2. The second electrode 9 extends from the fourth chamber 16 to the first chamber 14 and the second chamber 15 to be joined to the other end of the temperature sensing component 8 and the fuse 2.

[0072] The temperature fuse further includes a first electronic wire 10 and a second electronic wire 11. At least a portion of the first electronic wire 10 is embedded in the third chamber 13 to be bonded to the first electrode 3. At least a portion of the second electronic wire 11 is embedded in the fourth chamber 16 to be bonded to the second electrode 9.

[0073] By adding the third chamber 13 and the fourth chamber 16 and the corresponding electrode components and electronic wire designs, the present invention provides a more flexible electrical connection method. This design enables the temperature fuse to better adapt to different battery thermal management systems, improving the applicability and flexibility of the product. In other embodiments, the first electronic wire 10 and the second electronic wire 11 may not be additionally connected, and an outwardly extending connection portion may be provided on the first electrode component 3 and the second electrode component 9 to connect an external device or a connector.

[0074] On the basis of the above embodiment, in an optional embodiment of the present invention, the temperature fuse further comprises epoxy resin 5 arranged at the openings of the first chamber 14, the second chamber 15, the third chamber 13 and the fourth chamber 16. A plurality of protrusions 19 are provided on the side of the first cover plate 4 away from the second chamber 15 to increase the contact surface with the epoxy resin 5 and improve the connection firmness. Preferably, the arc extinguishing particles are quartz sand, ceramic particles or mica.

[0075] The present invention improves the insulation performance and arc extinguishing ability of the temperature fuse by using epoxy resin 5 and specific arc extinguishing particle materials. This design enables the product to maintain stable performance under high voltage conditions and reduces safety risks.

[0076] In this embodiment, the connection between the temperature-sensing conductor 29 and the connecting conductor 28, the connection between the first electronic wire 10 and the first electrode member 3, the connection between the first electrode member 3 and the fuse 2, the connection between the first electrode member 3 and the temperature-sensing conductor 29, the connection between the second electronic wire 11 and the second electrode member 9, the connection between the second electrode member 9 and the fuse 2, and the connection between the second electrode member 9 and the temperature-sensing conductor 29 are all resistance welding, electric soldering iron welding or laser welding. In other embodiments, existing welding methods such as friction welding can also be used, and the present invention does not specifically limit this.

[0077] In the temperature fuse of the embodiment of the present invention, the temperature sensing component 8 and the fuse 2 are connected in parallel. Based on the parallel current sharing principle, when the circuit passes the working current or the rated current, the current divided is extremely small due to the large internal resistance of the fuse 2. At this time, the current basically passes through the temperature sensing component 8.

[0078] When the external environment exceeds the set value, the temperature-sensing conductor 29 melts and shrinks to both sides into a ball under the action of the special resin, thereby disconnecting. At the moment when the temperature-sensing conductor 29 is disconnected, the current flows through the fuse 2 circuit, so no arc is generated at the moment when the alloy is disconnected, avoiding the problem of insufficient arc extinguishing ability of ordinary temperature fuses that only use special resins to assist in circuit breaking.

[0079] When all the current passes through fuse 2, due to its large internal resistance, it generates heat quickly and fuse 2 melts quickly. Under the action of its own gravity, the quartz sand quickly occupies the area between the breakpoints of fuse 2 to cut off the arc. The gap between the quartz sands acts as a separator for the arc. The second cavity is filled with quartz sand, which transfers the arc energy and reduces the temperature at the arc starting point, thereby weakening the arc thermal ionization effect and assisting in extinguishing the arc. This avoids the problem of slow disconnection speed and long arc burning time of ordinary temperature fuses using special resins to assist in breaking.

[0080] Specifically, the arc starting point at the moment of disconnection of the temperature-sensitive conductor 29 is transferred from the cavity of the temperature-sensitive conductor 29 to the second current-type cavity, and a high internal resistance material sensitive to current is used to quickly heat and fuse to disconnect, and arc-extinguishing quartz sand with high thermal conductivity and strong arc-extinguishing performance is used to quickly extinguish the arc. This solves the problem that ordinary temperature fuses only use special resins to assist in disconnection, with slow disconnection speed and continuous arcing during disconnection.

[0081] Embodiment 2: The present application further provides a temperature fuse for a battery thermal management system, the implementation principle and technical effects of which are the same as those of Embodiment 1. For matters not mentioned in Embodiment 1, reference may be made to the contents of Embodiment 1.

[0082] like Figure 1 , 2 and Figure 4 As shown, the housing 1 in the first embodiment is an integrated structure. Figures 11 to 13 As shown, in this embodiment, the housing 1 is divided into a first housing 31, a second housing 32 and a third housing 33. The first housing 31 is provided with a first chamber 14. The second housing 32 is provided with a second chamber 15. The third housing 33 is provided with a third chamber 13 and a fourth chamber 16. Preferably, the third chamber 13 and the fourth chamber 16 are integrally designed into a total chamber.

[0083] The temperature sensing component 8 includes a temperature sensing conductor 29 and is embedded in the first cavity 14. The fuse 2 is embedded in the second cavity 15. The first electrode 3 extends into the first cavity 14 and the second cavity 15 respectively and is connected to one end of the temperature sensing conductor 29. The second electrode 9 extends into the first cavity 14 and the second cavity 15 respectively and is connected to the other end of the temperature sensing conductor 29. Then, the first shell 1, the second shell 1, the first electrode 3 and the second electrode 9 are embedded together in the total cavity of the third shell 1, and then the epoxy resin 5 is poured into the total cavity.

[0084] Specifically, although only one temperature-sensing conductor 29 is provided, since the fuse 2 is provided in parallel, when the temperature-sensing conductor 29 melts, the current flows through the fuse 2, which can also effectively avoid the arc generated when the temperature-sensing conductor 29 is disconnected, or greatly reduce the energy of the arc generated when the temperature-sensing conductor 29 is disconnected, thereby greatly improving the safety performance of the temperature fuse.

[0085] Preferably, the second housing 32 and the fuse 2 are combined into an existing resistance-type fuse, thereby removing the first cover plate 4 and the second cover plate 6 to reduce parts and corresponding assembly production steps, thereby greatly improving production efficiency. In this case, the first electrode member 3 and the second electrode member 9 can also be obtained by stamping / bending the pins of the existing resistance-type fuse.

[0086] Embodiment 3: The present application further provides a battery thermal management system, which includes a temperature fuse of a battery thermal management system as described in any paragraph of Embodiment 1.

[0087] The present invention provides a safer and more efficient thermal management solution by integrating the above-mentioned temperature fuse into the battery thermal management system. This integrated design can monitor and control the battery temperature in real time to prevent overheating, thereby extending the battery life and improving the safety of the entire vehicle.

[0088] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A thermal fuse for a battery thermal management system, characterized in that: The invention comprises a housing (1) provided with a first chamber (14) and a second chamber (15), a temperature sensing component (8) arranged in the first chamber (14), a fuse (2) arranged in the second chamber (15), a first electrode (3) respectively connected to one end of the temperature sensing component (8) and the fuse (2), and a second electrode (9) respectively connected to the other end of the temperature sensing component (8) and the fuse (2); The first chamber (14) is provided with special resin; the second chamber (15) is provided with arc extinguishing particles; The temperature sensing component (8) comprises a temperature sensing conductor (29), or at least two temperature sensing conductors (29) connected in series using a connecting conductor (28); The first electrode and the second electrode are obtained by a stamping and shaping process.

2. A thermal fuse for a battery thermal management system according to claim 1, characterized in that: The resistance of the temperature-sensing conductor (29) is lower than the resistance of the fuse (2), the melting point of the temperature-sensing conductor (29) is lower than the melting point of the fuse (2), and the melting point of the special resin is not higher than the melting point of the temperature-sensing conductor (29), so that when the operating temperature of the temperature fuse is lower than the melting point of the temperature-sensing conductor (29), the current of the temperature-sensing conductor (29) can be greater than the current of the fuse (2), and when the operating temperature of the temperature fuse is higher than the melting point of the temperature-sensing conductor (29), the temperature-sensing conductor (29) can be melted first so that all the current flows through the fuse (2) before the fuse (2) is melted.

3. A thermal fuse for a battery thermal management system according to claim 1, characterized in that: The length of the second chamber (15) is longer than the length of the first chamber (14); the length of the fuse (2) is longer than the length of the temperature-sensitive conductor (29); wherein the length of the fuse (2) is 1.2 to 4 times the length of the temperature-sensitive conductor (29); The temperature sensing component (8) is arranged in the first chamber (14) along the length direction of the first chamber (14); the fuse (2) is arranged in the second chamber (15) along the length direction of the second chamber (15); the length direction of the first chamber (14) and the length direction of the second chamber (15) are constructed to be the same direction.

4. A thermal fuse for a battery thermal management system according to claim 1, characterized in that: The temperature fuse further comprises an arc extinguishing member (7); the arc extinguishing member (7) is suitable for cooperating with the first chamber (14) to at least wrap a portion of the temperature sensing conductor (29); The first chamber (14) is provided with a first arc-extinguishing rib (12); the arc-extinguishing member (7) is provided with a second arc-extinguishing rib (21); and a conductor channel for the temperature-sensing conductor (29) to pass through is formed between the first arc-extinguishing rib (12) and the second arc-extinguishing rib (21).

5. A thermal fuse for a battery thermal management system according to claim 4, characterized in that: The first chamber (14) is provided with a plurality of the first arc-extinguishing ribs (12) at intervals; the arc-extinguishing member (7) is provided with a plurality of the second arc-extinguishing ribs (21) at intervals; the plurality of the first arc-extinguishing ribs (12) and the plurality of the second arc-extinguishing ribs (21) correspond one to one; The connecting conductor (28) is provided with a first connecting groove (30) for joining to the temperature sensing conductor (29); the connecting conductor (28) is arranged between two first arc-extinguishing ribs (12); The first electrode member (3) is provided with a second connection groove (24) joined to the temperature-sensing conductor (29); and the second electrode member (9) is provided with a third connection groove (27) joined to the temperature-sensing conductor (29).

6. A thermal fuse for a battery thermal management system according to claim 1, characterized in that: The temperature fuse further comprises a first cover plate (4); the first cover plate (4) is adapted to cooperate with the second chamber (15) to enclose the fuse (2); the first cover plate (4) is provided with a first electrode hole (20) for the first electrode member (3) to pass through, and a second electrode hole (17) for the second electrode member (9) to pass through; At least part of the first electrode member (3) is configured to extend along a side of the first cover plate (4) away from the second chamber (15) to the first electrode hole (20).

7. A thermal fuse for a battery thermal management system according to claim 6, characterized in that: The first cover plate (4) is further provided with a particle filling hole (18) for filling the arc-extinguishing particles into the second chamber (15); The particle filling hole (18) is connected to the second electrode hole (17); The temperature fuse further comprises a second cover plate (6) for sealing the particle filling hole (18); A plurality of protrusions (19) are provided on a side of the first cover plate (4) away from the second chamber (15).

8. A thermal fuse for a battery thermal management system according to any one of claims 1 to 7, characterized in that: The housing (1) further comprises a third chamber (13) and a fourth chamber (16); the first electrode member (3) extends from the third chamber (13) to the first chamber (14) and the second chamber (15) and is joined to one end of the temperature sensing component (8) and the fuse (2); the second electrode member (9) extends from the fourth chamber (16) to the first chamber (14) and the second chamber (15) and is joined to the other end of the temperature sensing component (8) and the fuse (2); The temperature fuse further comprises a first electronic wire (10) and a second electronic wire (11); at least a portion of the first electronic wire (10) is embedded in the third chamber (13) to be joined to the first electrode member (3); and at least a portion of the second electronic wire (11) is embedded in the fourth chamber (16) to be joined to the second electrode member (9).

9. A thermal fuse for a battery thermal management system according to claim 8, characterized in that: The temperature fuse further comprises epoxy resin (5) arranged in the openings of the first chamber (14), the second chamber (15), the third chamber (13) and the fourth chamber (16); The arc extinguishing particles are quartz sand, ceramic particles or mica; The temperature-sensitive conductor (29) is an alloy-type temperature fuse.

10. A battery thermal management system, characterized in that: A temperature fuse comprising a battery thermal management system as claimed in any one of claims 1 to 9.

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