High-pressure liquid heater for new energy automobile

Abstract

The utility model belongs to the technical field of new energy automobiles, and particularly discloses a new energy automobile high-pressure liquid heater which comprises a heater body, a thick film heating plate, a heat insulation plate, a cover plate and an overheating protection circuit which are sequentially installed from bottom to top. The overheating protection circuit comprises four thermistors Rt1, Rt2, Rt3 and Rt4, an N-type MOS tube, a relay KJ, a heating resistance wire Rh, a resistor R1, a resistor R2, a resistor R3, a low-voltage direct-current power supply and a high-voltage direct-current power supply. According to the thick film heating plate, the water-drop-shaped turbulent flow columns and the turbulent flow teeth are arranged, so that the heat conduction efficiency and the heat exchange efficiency of the thick film heating plate in liquid are improved, and better convective heat exchange is realized; and the overheating protection circuit is arranged, so that the reliability of the heater during over-temperature protection is improved, and the heater is not only controlled by software.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy vehicles, and in particular to a high-voltage liquid heater for new energy vehicles. Background Art

[0002] With the country's increasingly stringent environmental protection requirements and the promising development prospects of new energy vehicles, the application of high-voltage liquid heaters for new energy vehicles in the automotive industry will continue to grow rapidly, thanks to strong government support. Liquid heaters are essential auxiliary heating devices in the thermal management system of new energy vehicles. They ensure rapid heating of the power battery in low-temperature environments, maintaining the battery at a normal operating temperature and a comfortable cabin temperature.

[0003] Liquid heaters are commonly used in thermal management systems. Their function is to heat circulating coolant, achieving this through circulation and heat exchange. Coolant heating requires extremely high efficiency and reliability. Currently, traditional liquid heaters generally use PTCs. However, as the operating voltage of new energy vehicle platforms continues to increase, PTCs present issues such as high voltage resistance, excessive starting current, heavy weight, and power attenuation.

[0004] Due to its unique characteristics, thick-film heating systems are increasingly becoming a preferred thermal management method for new energy vehicles. Currently, thick-film manufacturers mostly use thick-film NTCs (thermistors or temperature sensors) or external NTC components (thermistors or temperature sensors) for temperature detection. Printing thick-film NTC circuits simplifies circuitry, and external NTC components are relatively compact. However, these temperature control methods require the heater control board to continuously monitor NTC resistance changes to determine the thick-film heater's temperature. Alternatively, they monitor the heater's water outlet temperature to determine the heater's temperature range. These methods require a controller (host) to receive temperature control data and perform algorithmic processing, effectively implementing software control. Communication anomalies between the heater control board and the controller (host), preventing timely transmission and processing of temperature control data, can lead to delayed temperature detection of the thick-film heater, potentially causing overheating, burnout, or temperature anomalies. Utility Model Content

[0005] The purpose of the utility model is to solve the technical problems existing in the background technology, and to this end, a high-voltage liquid heater for new energy vehicles is provided.

[0006] In order to achieve the above purpose, the technical solutions adopted by this utility model are as follows:

[0007] A high-voltage liquid heater for a new energy vehicle comprises a heater body and a cover plate connected to each other, wherein a liquid cavity flow channel is provided inside the heater body;

[0008] A thick film heating plate is installed between the liquid cavity flow channel and the cover plate, and a side of the thick film heating plate away from the liquid cavity flow channel is connected to an overheating protection circuit;

[0009] The overheat protection circuit includes N thermistors, MOS tubes, relays and heating resistance wires, wherein N ≥ 2;

[0010] N thermistors are connected in parallel, one end of the N thermistors is electrically connected to the G pole of the MOS tube, the D pole of the MOS tube is electrically connected to the coil of the relay, and the contacts of the relay are connected in series with the heating resistance wire.

[0011] The following is a technical solution further defined by the present invention, wherein the overheat protection circuit further includes a resistor R1, a resistor R2, a resistor R3, a low-voltage power supply, and a high-voltage power supply;

[0012] The positive electrode of the low-voltage power supply is electrically connected to one end of the N thermistors through the resistor R1, and the other end of the N thermistors is electrically connected to the negative electrode of the low-voltage power supply;

[0013] The positive electrode of the low-voltage power supply is electrically connected to the G electrode of the MOS tube through the resistor R1, the G electrode of the MOS tube is electrically connected to the negative electrode of the low-voltage power supply through the resistor R3, the positive electrode of the low-voltage power supply is electrically connected to the D electrode of the MOS tube through the resistor R2, and the S electrode of the MOS tube is electrically connected to the negative electrode of the low-voltage power supply;

[0014] The D pole of the MOS tube is electrically connected to one end of the relay coil, and the other end of the relay coil is electrically connected to the negative pole of the low-voltage power supply;

[0015] The contacts of the relay are connected in series with the heating resistor wire and then connected to a high voltage power supply.

[0016] The following is a technical solution further defined by the present invention, wherein the heating resistance wire and N thermistors are all thick-film arranged on a thick-film heating plate.

[0017] The following is a technical solution further defined by the present invention: a plurality of first spoiler columns are provided on a side of the thick film heating plate close to the liquid cavity flow channel, and a plurality of second spoiler columns are provided at the bottom of the liquid cavity flow channel.

[0018] The following is a technical solution further defined by the present invention, wherein the first spoiler column and the second spoiler column are both configured in a water drop shape.

[0019] The following is a technical solution further defined by the present invention, in which a plurality of flow channel walls are fixedly arranged inside the heater body, and the plurality of flow channel walls are staggered in sequence on the two side walls inside the heater body, and a serpentine liquid cavity flow channel is formed between the plurality of flow channel walls and the side walls inside the heater body.

[0020] The following is a technical solution further defined by the present invention, wherein a group of spoiler teeth are provided on the flow channel wall.

[0021] The following is a technical solution further defined by the present invention, wherein a heat insulation plate is provided between the thick film heating plate and the cover plate.

[0022] The following is a technical solution further defined by the present invention: an expansion joint 1 is provided in the middle of the thick film heating plate, and an expansion joint 2 is provided in the middle of the heat insulation plate, and the expansion joint 1 and the expansion joint 2 correspond to each other in the upper and lower parts.

[0023] The following is a technical solution further defined by the present invention: a water inlet pipe and a water outlet pipe are fixedly provided on the outer side wall of the heater body, the inlet of the liquid cavity flow channel is connected to the water inlet pipe, and the outlet of the liquid cavity flow channel is connected to the water outlet pipe.

[0024] Compared with the prior art, the present invention has the following technical effects:

[0025] The utility model improves the thermal conductivity and heat exchange efficiency of the thick film heating plate in the liquid by setting up water droplet-shaped spoiler columns and spoiler teeth, thereby achieving better convective heat exchange; by setting up an overheating protection circuit, the reliability of the heater during overtemperature protection is improved, and it does not rely solely on software control.

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 It is a schematic diagram of the explosion structure of the utility model from one perspective;

[0029] Figure 2 It is a schematic diagram of the explosion structure of the utility model from another perspective;

[0030] Figure 3 This is a schematic diagram of the top view of the heater body in the present invention;

[0031] Figure 4 This is a schematic diagram of the top view of the medium-thick film heating plate of the utility model;

[0032] Figure 5 It is a connection diagram of the overheat protection circuit in the utility model.

[0033] Figure numerals: 1. Heater body; 2. Cover plate; 3. Liquid cavity flow channel; 4. Thick film heating plate; 5. Second spoiler column; 6. Flow channel wall; 601. First flow channel wall; 602. Second flow channel wall; 603. Third flow channel wall; 604. Spoiler teeth; 7. Heat insulation board; 8. Water inlet pipe; 9. Water outlet pipe; 10. Annular slot; 11. First spoiler column; 12. Expansion joint one; 13. Expansion joint two; 14. Electrical device storage cavity; 15. Wiring port. DETAILED DESCRIPTION

[0034] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, the following detailed description of specific embodiments of the present invention is provided in conjunction with the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0035] like Figure 1-5 As shown, this embodiment provides a high-voltage liquid heater for new energy vehicles. The heater body 1, thick-film heating plate 4, thermal insulation plate 7, and cover plate 2 are sequentially installed from bottom to top. The heater body 1 and cover plate 2 are fixedly connected by screws; the thick-film heating plate 4 is embedded in an annular groove 10 in the heater body 1 and secured in place by small screws. It should be noted that a sealing ring (not shown) is placed in the annular groove 10 for sealing.

[0036] The heater body 1 defines a liquid cavity flow channel 3. A water inlet pipe 8 and a water outlet pipe 9 are fixedly mounted on the outer wall of the heater body 1. The inlet of the liquid cavity flow channel 3 is connected to the water inlet pipe 8, and the outlet of the liquid cavity flow channel 3 is connected to the water outlet pipe 9. Furthermore, an electrical component storage chamber 14 is defined within the heater body 1. Four wiring ports 15 are provided on the side wall of the heater body 1 near the electrical component storage chamber 14 for wiring. The electrical component storage chamber 14 is located near the liquid cavity flow channel 3.

[0037] A plurality of droplet-shaped first spoiler columns 11 are provided on one side of the thick film heating plate 4 close to the liquid cavity flow channel 3 to increase the heat exchange effect of the liquid; a plurality of droplet-shaped second spoiler columns 5 are provided at the bottom of the liquid cavity flow channel 3 to increase the heat exchange effect of the liquid.

[0038] Three flow channel walls 6 are fixedly disposed within the heater body 1, specifically comprising a first flow channel wall 601, a second flow channel wall 602, and a third flow channel wall 603. The first flow channel wall 601 and the third flow channel wall 603 are fixedly disposed on the left side wall of the heater body 1, while the second flow channel wall 602 is fixedly disposed on the right side wall of the heater body 1. The first flow channel wall 601, the second flow channel wall 602, the third flow channel wall 603, and the side walls within the heater body 1 form a serpentine liquid cavity flow channel 3. A set of spoiler teeth 604 are disposed on each of the first flow channel wall 601, the second flow channel wall 602, and the third flow channel wall 603 to enhance the heat exchange effect of the liquid.

[0039] The side of the thick film heating plate 4 away from the liquid chamber flow channel 3 is connected to an overheating protection circuit, which does not require software control, or even if there is software control, it can prevent software failure and is used to cut off the high-voltage power supply of the thick film heating plate 4 when overtemperature occurs.

[0040] The overheat protection circuit includes four thermistors Rt1, Rt2, Rt3, and Rt4, an N-type MOSFET, a relay KJ, a heating resistor Rh, resistors R1, R2, and R3, a low-voltage DC power supply, and a high-voltage DC power supply. The four thermistors prevent the overheat protection from failing due to a single thermistor failure.

[0041] The positive electrode of the low-voltage power supply is electrically connected to one end of the four thermistors Rt1, Rt2, Rt3, and Rt4 through the resistor R1. The four thermistors Rt1, Rt2, Rt3, and Rt4 are connected in parallel. The other ends of the four thermistors Rt1, Rt2, Rt3, and Rt4 are electrically connected to the negative electrode of the low-voltage power supply.

[0042] The positive electrode of the low-voltage power supply is electrically connected to the G electrode of the MOS tube through the resistor R1, the G electrode of the MOS tube is electrically connected to the negative electrode of the low-voltage power supply through the resistor R3, the positive electrode of the low-voltage power supply is electrically connected to the D electrode of the MOS tube through the resistor R2, and the S electrode of the MOS tube is electrically connected to the negative electrode of the low-voltage power supply.

[0043] The D pole of the MOS tube is electrically connected to one end of the coil of the relay KJ, and the other end of the coil of the relay KJ is electrically connected to the negative pole of the low-voltage power supply. The contact of the relay KJ is connected in series with the heating resistor Rh and then connected to the high-voltage power supply.

[0044] The heating resistance wire Rh and four thermistors Rt1, Rt2, Rt3 and Rt4 are all thick-film arranged on the thick-film heating plate.

[0045] Four thermistors Rt1, Rt2, Rt3, and Rt4 detect the temperatures of four positions of the heater. Under normal circumstances, the MOS tube is not conducting, the coil of the relay KJ is energized, the contacts of the normally open relay KJ are closed, and the heating resistor Rh works normally for heating; when any thermistor detects overtemperature, the resistance of the thermistor is reduced to the minimum or even 0. At this time, the MOS tube is conducted, the coil of the relay KJ is not energized, and the contacts of the normally open relay KJ are disconnected, thereby disconnecting the heating work of the heating resistor Rh.

[0046] To prevent thermal deformation of the thick-film heating plate 4 and the insulation plate 7, an expansion joint 12 is provided in the center of the thick-film heating plate 4, and an expansion joint 13 is provided in the center of the insulation plate 7. Expansion joint 12 and expansion joint 13 overlap vertically. It should be noted that a sealing ring (not shown) is placed on the second flow channel wall 602 for sealing. The sealing ring is located around the expansion joint 12, so the second flow channel wall 602 is widened.

[0047] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Any person skilled in the art can, without departing from the scope of the present invention, utilize the methods and technical content disclosed above to make many possible variations and modifications to the present invention, or modify it into equivalent embodiments with equivalent variations. Therefore, any equivalent variations based on the shape, structure, and principle of the present invention that do not depart from the content of the present invention are intended to be covered by the scope of protection of the present invention.

Claims

1. A high-voltage liquid heater for new energy vehicles, characterized in that: It comprises a heater body and a cover plate connected to each other, wherein a liquid cavity flow channel is opened inside the heater body; A thick film heating plate is installed between the liquid cavity flow channel and the cover plate, and a side of the thick film heating plate away from the liquid cavity flow channel is connected to an overheating protection circuit; The overheat protection circuit includes N thermistors, MOS tubes, relays and heating resistance wires, wherein N ≥ 2; N thermistors are connected in parallel, one end of the N thermistors is electrically connected to the G pole of the MOS tube, the D pole of the MOS tube is electrically connected to the coil of the relay, and the contacts of the relay are connected in series with the heating resistance wire.

2. A new energy vehicle high-voltage liquid heater as claimed in claim 1, characterized in that: The overheat protection circuit also includes a resistor R1, a resistor R2, a resistor R3, a low-voltage power supply and a high-voltage power supply; The positive electrode of the low-voltage power supply is electrically connected to one end of the N thermistors through the resistor R1, and the other end of the N thermistors is electrically connected to the negative electrode of the low-voltage power supply; The positive electrode of the low-voltage power supply is electrically connected to the G electrode of the MOS tube through the resistor R1, the G electrode of the MOS tube is electrically connected to the negative electrode of the low-voltage power supply through the resistor R3, the positive electrode of the low-voltage power supply is electrically connected to the D electrode of the MOS tube through the resistor R2, and the S electrode of the MOS tube is electrically connected to the negative electrode of the low-voltage power supply; The D pole of the MOS tube is electrically connected to one end of the relay coil, and the other end of the relay coil is electrically connected to the negative pole of the low-voltage power supply; The contacts of the relay are connected in series with the heating resistor wire and then connected to a high voltage power supply.

3. A new energy vehicle high-voltage liquid heater as claimed in claim 1, characterized in that: The heating resistance wire and N thermistors are all thick-film arranged on a thick-film heating plate.

4. A new energy vehicle high-voltage liquid heater as claimed in claim 1, characterized in that: A plurality of first spoiler columns are provided on a side of the thick film heating plate close to the liquid cavity flow channel, and a plurality of second spoiler columns are provided at the bottom of the liquid cavity flow channel.

5. A new energy vehicle high-voltage liquid heater as claimed in claim 4, characterized in that: The first spoiler column and the second spoiler column are both configured to be in a water drop shape.

6. The high-voltage liquid heater for new energy vehicles according to claim 1, characterized in that: A plurality of flow channel walls are fixedly arranged inside the heater body, and the plurality of flow channel walls are staggered and arranged on the two side walls inside the heater body in sequence, and a serpentine liquid cavity flow channel is formed between the plurality of flow channel walls and the side walls inside the heater body.

7. A new energy vehicle high-voltage liquid heater as claimed in claim 6, characterized in that: A group of spoiler teeth are arranged on the flow channel wall.

8. The high-voltage liquid heater for new energy vehicles according to claim 1, characterized in that: A heat insulation plate is provided between the thick film heating plate and the cover plate.

9. A new energy vehicle high-voltage liquid heater as claimed in claim 8, characterized in that: An expansion joint 1 is provided in the middle of the thick film heating plate, and an expansion joint 2 is provided in the middle of the heat insulation plate. The expansion joint 1 and the expansion joint 2 correspond to each other in the upper and lower parts.

10. The high-voltage liquid heater for new energy vehicles according to claim 1, characterized in that: A water inlet pipe and a water outlet pipe are fixedly arranged on the outer side wall of the heater body, the inlet of the liquid cavity flow channel is connected to the water inlet pipe, and the outlet of the liquid cavity flow channel is connected to the water outlet pipe.

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