A new energy automobile battery box heat exchange device and heat exchange assembly

Abstract

The application discloses a new energy automobile battery box heat exchange device and heat exchange assembly, and relates to the technical field of battery box heat exchange devices, comprising a box body for accommodating a battery pack and a plurality of semiconductor refrigerating sheets for cooling the battery pack, wherein the box body is provided with a relay electrically connected with the plurality of semiconductor refrigerating sheets, and the box body is provided with a variable rate mechanism for adjusting the operating power of the plurality of semiconductor refrigerating sheets according to the temperature of the battery pack, the variable rate mechanism comprises an outward heat conduction plate fixedly connected to the box body, one side of the heat conduction base is provided with a dynamic variable resistor, and the box body is provided with a resistance adjusting assembly for adjusting the line current value of the sliding variable resistor according to the temperature change; the variable rate mechanism is arranged to realize self-adaptive adjustment of the temperature of the battery pack, the operating power of the semiconductor refrigerating sheets can be automatically adjusted according to the temperature change of the battery pack, the required heat exchange capacity can be self-adaptively adjusted, and the temperature of the battery pack is maintained stable.

Description

Technical Field

[0001] This invention relates to the field of battery box heat exchange device technology, specifically to a new energy vehicle battery box heat exchange device and heat exchange assembly. Background Technology

[0002] During the operation of an electric vehicle, the battery generates a large amount of heat. If heat cannot be dissipated in a timely and effective manner, the battery temperature will become too high, leading to a series of problems such as decreased battery performance, shortened lifespan, and even thermal runaway, posing serious safety hazards.

[0003] Chinese Patent (Announcement No.: CN106684279B) describes a solution that includes a heat exchange core fixing bracket with a receiving cavity. One side of the bracket houses the heat exchange core for heat exchange, and the other side has a backplate connected to the battery box. The lower part of the contact surface between the backplate and the battery box has an air inlet, and the upper part has an air outlet. The heat exchange core comprises multiple vertically arranged, spaced-apart finned cavities. Each finned cavity has an air inlet at its lower end communicating with the air inlet of the backplate, and an air outlet at its upper end communicating with the air outlet of the backplate. The gaps between each finned cavity are open to the outside atmosphere at both ends. A fan is located near the air inlet of the backplate within the receiving cavity of the heat exchange core fixing bracket to draw air from the battery box into the air inlet, and then blown out through the finned cavities, air outlet, and air outlet. This invention aims to solve the problem of insufficient heat dissipation in existing new energy vehicle batteries, which reduces battery life.

[0004] Existing battery heat exchangers typically activate only when the battery temperature exceeds its optimal operating temperature range, lacking dynamic adjustment capabilities. However, during operation, even if the initial temperature is within the optimal operating range, continuous operation can cause the battery pack's temperature to rise, eventually exceeding the optimal range. Existing thermal management systems struggle to adaptively adjust the required heat exchange capacity based on the battery pack's real-time temperature.

[0005] Meanwhile, when the battery temperature is close to or within the optimal operating temperature range, the heat exchange system is difficult to finely adjust, resulting in large temperature fluctuations, which affect battery performance and lifespan. Furthermore, continuous high-power heat exchange may lead to increased temperature differences within the battery pack, with local overheating or overcooling occurring frequently, further affecting the overall performance and lifespan of the battery pack. Therefore, a heat exchange device and heat exchange assembly for a new energy vehicle battery box are proposed. Summary of the Invention

[0006] The purpose of this invention is to provide a heat exchange device and heat exchange assembly for a new energy vehicle battery pack, which has the advantages of adaptively adjusting the required heat exchange capacity and maintaining the stable temperature of the battery pack, thus solving the problem of difficulty in adaptively adjusting the required heat exchange capacity according to the real-time temperature of the battery pack.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a heat exchange device for a new energy vehicle battery box, comprising a box for accommodating a battery pack and multiple sets of semiconductor cooling chips for cooling the battery pack, an inner frame for supporting the battery pack is provided inside the box, a relay electrically connected to the multiple sets of semiconductor cooling chips is provided on the box, and a variable rate mechanism for adjusting the operating power of the multiple sets of semiconductor cooling chips according to the battery pack temperature is provided on the box.

[0008] The variable rate mechanism includes an external heat-conducting plate fixedly connected to the housing, a heat-conducting base fixedly connected to the external heat-conducting plate, and a sliding rheostat electrically connected to a relay and multiple sets of semiconductor cooling chips on one side of the heat-conducting base. The sliding rheostat is fixedly connected to the heat-conducting base, and the housing is provided with a resistance adjustment component that adjusts the current value of the circuit where the sliding rheostat is located according to the temperature change.

[0009] Multiple sets of internal heat-conducting plates are fixedly connected to the heat-conducting base. These internal heat-conducting plates penetrate the casing and are located within the battery pack.

[0010] Preferably, the resistance adjustment assembly includes a middle seat disposed on a heat-conducting base, and the heat-conducting base is provided with a transverse sliding groove for sliding connection of the middle seat. The middle seat is provided with an upper rod that moves freely in the horizontal direction, and the middle seat is provided with a groove for sliding connection of the upper rod.

[0011] The sliding rheostat includes an integrally formed resistance coil and a slider. A connecting rod is fixedly connected to the upper rod, and the end of the connecting rod away from the upper rod is fixedly connected to the slider.

[0012] Preferably, the end of the middle seat away from the sliding rheostat is provided with a mountain-shaped seat that is slidably connected on the transverse slide groove, and the horizontal sides of the mountain-shaped seat are respectively provided with Super Design No. 1 temperature memory alloy and Super Design No. 2 temperature memory alloy.

[0013] The two ends of the Super Design No. 1 temperature memory alloy are fixedly connected to the heat-conducting base and the mountain-shaped base, respectively, and the two ends of the Super Design No. 2 temperature memory alloy are fixedly connected to the mountain-shaped base and the Super Design No. 2 temperature memory alloy, respectively.

[0014] Preferably, the middle seat is provided with a V-shaped rocker arm, and the middle part of the V-shaped rocker arm rotates on the middle seat with a fixed axis. The end of the V-shaped rocker arm facing the upper rod is fixedly connected with a corresponding pin, and the upper rod is provided with a corresponding groove for the corresponding pin to slide.

[0015] The heat-conducting base is provided with a side rod that is set at a right angle to the upper rod, and the heat-conducting base is provided with a groove for the side rod to slide.

[0016] The V-shaped rocker arm is fixedly connected to a limiting pin at one end away from the corresponding pin, and a limiting groove is provided on the side rod for the limiting pin to slide.

[0017] Preferably, a rectangular seat is slidably connected to the second tank. Differential temperature memory alloy No. 1 and differential temperature memory alloy No. 2 are respectively provided on the horizontal sides of the rectangular seat. The two ends of differential temperature memory alloy No. 1 are fixedly connected to the side rod and the rectangular seat, respectively, and the two ends of differential temperature memory alloy No. 2 are fixedly connected to the rectangular seat and the heat-conducting base, respectively.

[0018] Preferably, the differential temperature memory alloy No. 1 and differential temperature memory alloy No. 2 are in an elongated deformation state within the set temperature range of the battery pack.

[0019] Preferably, the outer side of the housing is fixedly connected to multiple sets of edge sealing plates, and the edge sealing plates are provided with multiple sets of mounting slots arranged in a rectangular array for snapping and fixing semiconductor cooling chips.

[0020] Preferably, a heat exchange assembly for a new energy vehicle battery box is used in a heat exchange device for a new energy vehicle battery box. The inner frame is provided with multiple sets of cooling fans that are driven by motors and rotate freely. The cooling fans rotate on the box body with a fixed axis, and the box body is provided with heat dissipation channel holes corresponding to the positions of the cooling fans.

[0021] The inner frame is provided with a ventilation opening for air circulation, and the inside of the box is provided with a liquid circulation pipe for heat exchange inside the battery pack, and the box is provided with a pipe positioning hole for the liquid circulation pipe to pass through.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] This invention achieves adaptive temperature regulation of the battery pack by setting up a variable rate mechanism, utilizing the characteristics of temperature memory alloys, and combining a sliding rheostat and a semiconductor cooling chip. In this way, it can automatically adjust the operating power of the semiconductor cooling chip according to the temperature changes of the battery pack, so as to adaptively adjust the required heat exchange capacity and maintain the temperature stability of the battery pack.

[0024] This invention utilizes a relay to switch between cooling and heating by altering the direction of the current, leveraging the bidirectional characteristics of a semiconductor cooling chip. This allows for heating of the battery pack in low-temperature environments and cooling in high-temperature environments. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 This is a schematic diagram showing the location of the pipe positioning hole in this invention;

[0027] Figure 3 This is a schematic diagram of the component containing the heat-conducting base of the present invention;

[0028] Figure 4 For the present invention Figure 3 Enlarged view of point A in the middle;

[0029] Figure 5 This is a schematic diagram of the component containing the seat in this invention;

[0030] Figure 6 For the present invention Figure 5 Enlarged view at point B in the middle;

[0031] Figure 7 This is a schematic diagram of the component containing the connecting rod of the present invention;

[0032] Figure 8 This is a schematic diagram of the component containing the edge sealing plate of the present invention.

[0033] In the diagram: 1. Housing; 2. External heat dissipation plate; 3. Cooling fan; 4. Internal frame; 5. Side sealing plate; 6. Mounting slot; 7. Semiconductor cooling chip; 8. Heat dissipation channel hole; 9. Pipe positioning hole; 10. Heat-conducting base; 11. Mid-position seat; 12. Horizontal slide groove; 13. Sliding rheostat; 131. Slider; 14. Connecting rod; 15. Upper rod; 16. V-shaped swing rod; 17. Corresponding pin; 18. Corresponding groove; 19. Side rod; 20. Limiting pin; 21. Limiting groove; 22. Mountain-shaped seat; 23. Over-design No. 1 temperature memory alloy; 24. Over-design No. 2 temperature memory alloy; 25. Rectangular seat; 26. Differential design No. 1 temperature memory alloy; 27. Differential design No. 2 temperature memory alloy; 28. Internal heat dissipation plate. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0035] Please see Figures 1 to 8 The present invention provides a technical solution: a heat exchange device and heat exchange assembly for a new energy vehicle battery box, including a box 1 for accommodating a battery pack and multiple sets of semiconductor cooling chips 7 for cooling the battery pack. The box 1 is provided with an inner frame 4 for supporting the battery pack. The box 1 is provided with a relay electrically connected to the multiple sets of semiconductor cooling chips 7. The box 1 is provided with a variable rate mechanism for adjusting the operating power of the multiple sets of semiconductor cooling chips 7 according to the battery pack temperature.

[0036] The variable rate mechanism includes an external heat-conducting plate 2 fixedly connected to the housing 1, a heat-conducting base 10 fixedly connected to the external heat-conducting plate 2, and a sliding rheostat 13 electrically connected to a relay and multiple sets of semiconductor cooling chips 7 on one side of the heat-conducting base 10. The sliding rheostat 13 is fixedly connected to the heat-conducting base 10, and the housing 1 is provided with a resistance adjustment component that adjusts the current value of the circuit where the sliding rheostat 13 is located according to the temperature change.

[0037] Multiple sets of internal heat-conducting plates 28 are fixedly connected to the heat-conducting base 10. The multiple sets of internal heat-conducting plates 28 penetrate the housing 1 and are located in the battery pack.

[0038] The outer side of the housing 1 is fixedly connected to multiple sets of edge sealing plates 5. The edge sealing plates 5 are provided with multiple sets of mounting slots 6 arranged in a rectangular array for snapping and fixing the semiconductor cooling chip 7.

[0039] like Figure 1 and Figure 3 As shown, the heat generated during battery pack operation is the result of the combined effects of multiple factors, including the irreversibility of electrochemical reactions, resistance loss, thermal properties of materials, charge and discharge management, battery pack integration effect, and environmental factors. These factors interact, making it inevitable that the battery will generate heat during operation. The heat inside the battery pack is conducted through multiple sets of internal heat conduction plates 28 that penetrate into the housing 1 and are located inside the battery pack, and the heat is transferred to the external heat conduction plates 2 and the heat conduction base 10 fixedly installed on the external heat conduction plates 2.

[0040] At the same time, the temperature change at the heat-conducting base 10 can adjust the horizontal position of the upper rod 15, and then adjust the resistance value of the sliding rheostat 13 on the circuit by changing the position of the upper rod 15, thereby changing the current value of the circuit where the sliding rheostat 13 and the multiple sets of semiconductor cooling chips 7 electrically connected to it are located, and thus changing the operating power of the multiple sets of semiconductor cooling chips 7.

[0041] If the optimal operating temperature range of the battery pack is 15 degrees Celsius to 35 degrees Celsius, then the operating temperature of the battery pack is detected by a temperature sensor fixedly installed inside the housing 1. When the internal temperature of the housing 1 exceeds or falls below the set temperature value, the current direction of the circuits containing multiple sets of semiconductor cooling chips 7 is changed by a relay. Thus, when the internal temperature of the housing 1 is lower than the set temperature, the side wall of the housing 1 can be heated by the multiple sets of semiconductor cooling chips 7, so as to drive the housing 1 to transfer the heat to the battery pack inside, thereby achieving the purpose of raising the temperature of the battery pack.

[0042] Meanwhile, when the temperature inside the housing 1 exceeds the set value, the relay switches the current value of the circuit where the thermoelectric cooler 7 is located. This allows the thermoelectric cooler 7 to cool the housing 1 and the battery pack inside without changing the relative position of the thermoelectric cooler 7 and the housing 1. By changing the direction of the current through the relay, the purpose of bidirectional thermal management is achieved. That is, the thermoelectric cooler 7 can be driven to cool or heat the battery pack to ensure that the battery box can maintain good performance in low and high temperature environments and extend the life of the battery pack.

[0043] In one preferred embodiment, the resistance adjustment assembly includes a middle seat 11 disposed on a heat-conducting base 10, and the heat-conducting base 10 is provided with a transverse sliding groove 12 for sliding connection of the middle seat 11. The middle seat 11 is provided with an upper rod 15 that moves freely in the horizontal direction, and the middle seat 11 is provided with a groove for sliding connection of the upper rod 15.

[0044] The sliding rheostat 13 includes an integrally formed resistance coil and a slider 131. A connecting rod 14 is fixedly connected to the upper rod 15, and the end of the connecting rod 14 away from the upper rod 15 is fixedly connected to the slider 131.

[0045] like Figure 3 , Figure 5 and Figure 7 As shown, when the temperature inside the battery pack changes, the heat can be transferred to the heat-conducting base 10 through multiple sets of internal heat-conducting plates 28 and external heat-conducting plates 2. The temperature change at the heat-conducting base 10 can change the position of the upper rod 15 in the horizontal direction. The upper rod 15 is fixedly connected to the slider 131 integrally formed on the sliding rheostat 13 through the connecting rod 14. The horizontal position change of the upper rod 15 changes the relative position between the slider 131 and the resistance coil, thereby changing the resistance value of the circuit where the sliding rheostat 13 and multiple sets of semiconductor cooling chips 7 are located, so as to adjust the operating power of multiple sets of semiconductor cooling chips 7 by changing the current value.

[0046] To ensure that the heat exchange capacity can be dynamically changed when the battery pack is in the optimal operating temperature range, the middle seat 11 is provided with a mountain-shaped seat 22 that is slidably connected on the transverse groove 12 at the end away from the sliding rheostat 13. The horizontal sides of the mountain-shaped seat 22 are respectively provided with super-design No. 1 temperature memory alloy 23 and super-design No. 2 temperature memory alloy 24.

[0047] The two ends of the super-design No. 1 temperature memory alloy 23 are fixedly connected to the heat-conducting base 10 and the mountain-shaped base 22, respectively, and the two ends of the super-design No. 2 temperature memory alloy 24 are fixedly connected to the mountain-shaped base 22 and the super-design No. 2 temperature memory alloy 24, respectively.

[0048] like Figure 3 and Figure 5 As shown, when the battery pack is in the optimal temperature range, its internal temperature tends to continue to rise due to the continuous operation of the battery pack. At this time, when either the super-design No. 1 temperature memory alloy 23 or the super-design No. 2 temperature memory alloy 24 undergoes elongation deformation due to the temperature rise, it can drive the middle position seat 11 and the upper position rod 15 set on it to move horizontally in sync, so as to change the relative position of the slider 131 and the resistor coil.

[0049] Meanwhile, the theoretical deformation threshold temperatures of Superdesign No. 1 temperature memory alloy 23 and Superdesign No. 2 temperature memory alloy 24 are within the optimal temperature range of the battery pack. However, heat loss occurs during the actual heat transfer process through multiple sets of internal heat conduction plates 28, external heat conduction plates 2, and heat conduction base 10. Consequently, the actual deformation threshold temperatures of Superdesign No. 1 temperature memory alloy 23 and Superdesign No. 2 temperature memory alloy 24 need to be slightly lower than the theoretical values.

[0050] When the battery pack temperature is already within the optimal temperature range, in order to address the temperature rise caused by the operation of the battery pack in advance, the relay adjusts the current direction to drive multiple sets of semiconductor cooling chips 7 to cool the housing 1 and the battery pack inside. When the temperature of the battery pack has not reached the actual deformation threshold temperature of the first temperature memory alloy 23 and the second temperature memory alloy 24, the resistance value of the circuit where the sliding rheostat 13 is located is relatively large, resulting in a smaller current value and a lower output power of the semiconductor cooling chip 7.

[0051] As the battery pack continues to operate, its internal temperature gradually rises. The actual deformation threshold temperatures of the super-designed temperature memory alloy 23 and the super-designed temperature memory alloy 24 are different. When the temperature rise causes one or both of the super-designed temperature memory alloy 23 and the super-designed temperature memory alloy 24 to undergo elongation deformation, it can drive the middle position seat 11 and the upper position rod 15 on it to move synchronously, thereby changing the relative position of the slider 131 on the resistance coil. At this time, the resistance value of the circuit where the sliding rheostat 13 is located decreases, that is, the current value of the circuit increases, so as to increase the operating power of the multiple sets of semiconductor cooling chips 7. Thus, when the battery pack temperature rises, the operating power of the semiconductor cooling chips 7 can be increased in time to dynamically adjust the heat exchange capacity, thereby responding to the temperature change of the battery pack in a timely manner, ensuring that the battery pack can be heat exchanged in a timely manner, and ensuring that the battery pack can always be within the optimal operating temperature range.

[0052] Furthermore, the middle seat 11 is provided with a V-shaped rocker arm 16, and the middle part of the V-shaped rocker arm 16 is fixedly rotated on the middle seat 11. The end of the V-shaped rocker arm 16 facing the upper rod 15 is fixedly connected with a corresponding pin 17, and the upper rod 15 is provided with a corresponding groove 18 for the corresponding pin 17 to slide.

[0053] The heat-conducting base 10 is provided with a side rod 19 that is set at a right angle to the upper rod 15. The heat-conducting base 10 has a groove for sliding connection of the side rod 19. The end of the V-shaped swing rod 16 away from the corresponding pin 17 is fixedly connected to a limiting pin 20. The side rod 19 has a limiting groove 21 for sliding connection of the limiting pin 20.

[0054] A rectangular seat 25 is slidably connected to the second tank. Differential temperature memory alloy 26 and differential temperature memory alloy 27 are respectively provided on the horizontal sides of the rectangular seat 25. The two ends of differential temperature memory alloy 26 are fixedly connected to the side rod 19 and the rectangular seat 25, respectively. The two ends of differential temperature memory alloy 27 are fixedly connected to the rectangular seat 25 and the heat-conducting base 10, respectively.

[0055] The differential temperature memory alloy 26 and differential temperature memory alloy 27 are in an elongation deformation state within the set temperature range of the battery pack.

[0056] like Figures 3-6 As shown, when the temperature is low, the battery pack needs to be preheated in the early stage of operation to ensure that the battery pack can reach the optimal operating temperature range as soon as possible. The temperature deformation thresholds of both differential temperature memory alloy 26 and differential temperature memory alloy 27 are lower than the optimal operating temperature. Then, the current direction is adjusted by the relay to drive multiple sets of semiconductor cooling chips 7 to heat the housing 1 and the battery pack inside, so as to raise the temperature of the housing 1 and make it reach the optimal temperature range as soon as possible.

[0057] Meanwhile, when the battery pack temperature rises to the optimal operating temperature range, the differential temperature memory alloy 26 and the rectangular seat 25 can undergo elongation deformation. In the initial state, the actual output resistance value at the sliding rheostat 13 is relatively large. However, as the differential temperature memory alloy 26 and the differential temperature memory alloy 27 undergo elongation deformation, the side rod 19 can be driven to move away from the middle seat 11.

[0058] The limiting pin 20 fixedly installed on the V-shaped rocker arm 16 is slidably installed on the side rod 19 through the limiting groove 21. When the side rod 19 moves horizontally away from the middle seat 11, it can drive the V-shaped rocker arm 16 to deflect. The corresponding pin 17 fixedly installed on the V-shaped rocker arm 16 is slidably connected to the upper rod 15 through the corresponding groove 18. This causes the upper rod 15 and the connecting rod 14 installed on it to move away from the sliding rheostat 13, thereby changing the actual output resistance value of the sliding rheostat 13 and increasing its actual resistance value. The purpose is to ensure that multiple sets of semiconductor cooling chips 7 can maintain a large operating power when the temperature is low, so as to raise the temperature at the battery pack in time.

[0059] As the battery pack temperature gradually increases but remains below the optimal operating temperature, the operating power of the multiple sets of thermoelectric coolers 7 can be gradually reduced. The battery pack itself generates heat during operation, and the multiple sets of thermoelectric coolers 7 still maintain a relatively high operating power, which may cause the battery pack to overheat. Therefore, when the battery pack is about to reach the optimal operating temperature, the operating power of the thermoelectric coolers 7 can be reduced to reduce the temperature rise of the battery pack.

[0060] At the same time, as the temperature rises and drives the temperature inside the battery pack to the optimal operating temperature range, the actual output resistance value of the sliding rheostat 13 is relatively large at this time. Consequently, the relay changes the current direction to drive multiple sets of semiconductor cooling chips 7 to cool the battery pack at a lower operating power in order to cope with the temperature rise trend caused by the operation of the battery pack.

[0061] As the temperature rises, the super-design No. 1 temperature memory alloy 23 and the super-design No. 2 temperature memory alloy 24 deform, driving the center seat 11 to move towards the sliding rheostat 13. This gradually increases the cooling effect of the multiple sets of semiconductor cooling chips 7 on the battery pack, and responds to the temperature changes of the battery pack in a timely manner. In actual use, since the battery pack itself generates heat during operation, when the temperature is lower than the optimal operating temperature of the battery pack, it can first raise the temperature of the battery pack position with a large heat exchange capacity, and gradually reduce the heat exchange capacity as the battery pack temperature rises.

[0062] When the battery pack reaches its optimal operating temperature range, the temperature tends to rise during operation. The current direction is then changed via a relay. At this point, the temperature at the battery pack location is initially reduced with a small heat exchange capacity. As the battery pack temperature gradually rises, the current value of the circuit containing the semiconductor cooling chip 7 is subsequently changed to maintain the battery pack's operating performance, thereby increasing the heat exchange capacity and ensuring timely heat dissipation for the battery pack. This allows the required heat exchange capacity to be adaptively adjusted according to the real-time temperature of the battery pack.

[0063] In actual use, when considering the heat loss of the inner heat conduction plate 28, the outer heat conduction plate 2, and the heat conduction base 10 during the heat conduction process, the actual deformation threshold temperatures of the super-designed first temperature memory alloy 23 and the super-designed second temperature memory alloy 24 can be set to 20 degrees Celsius and 30 degrees Celsius, respectively, and the actual deformation threshold temperatures of the differentially designed first temperature memory alloy 26 and the differentially designed second temperature memory alloy 27 can be set to 5 degrees Celsius and 15 degrees Celsius, respectively. The memory alloys with different thresholds can be set according to actual needs to respond to the temperature changes of the battery pack in a timely manner, thereby meeting the heat exchange requirements of the battery pack.

[0064] A heat exchange assembly for a new energy vehicle battery box is applied to a heat exchange device for a new energy vehicle battery box. The inner frame 4 is provided with multiple sets of cooling fans 3 that are driven by motors and rotate freely. The cooling fans 3 rotate on the box body 1 with a fixed axis, and the box body 1 is provided with heat dissipation channel holes 8 corresponding to the position of the cooling fans 3.

[0065] The inner frame 4 is provided with a ventilation opening for air circulation, and the inside of the box 1 is provided with a liquid circulation pipe for heat exchange inside the battery pack, and the box 1 is provided with a pipe positioning hole 9 for the liquid circulation pipe to pass through.

[0066] like Figure 1 and Figure 2 As shown, multiple cooling fans 3 are installed on the housing 1. The cooling fans 3 can remove the heat inside the housing 1 by forced convection and introduce ambient air into it. Through continuous airflow, the temperature of the battery pack inside is reduced. At the same time, dustproof cloths are installed at the positions of the heat dissipation channel holes 8 on the housing 1 to prevent external dust from entering the battery pack.

[0067] Meanwhile, the housing 1 can be equipped with a liquid circulation pipe for the circulation of coolant. The liquid circulation pipe conducts the heat generated by the battery pack to the radiator or other heat dissipation device through the circulation of coolant. Multiple sets of pipe positioning holes 9 are opened on the housing 1 to facilitate the installation and positioning of the liquid circulation pipe.

[0068] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A new energy vehicle battery box heat exchange device, comprising a box (1) for accommodating a battery pack and a plurality of semiconductor refrigerating sheets (7) for cooling the battery pack, the box (1) is provided with an inner support frame (4) for supporting the battery pack, and the box (1) is provided with a relay electrically connected with the plurality of semiconductor refrigerating sheets (7), characterized in that: The box (1) is provided with a variable mechanism for adjusting the operating power of a plurality of semiconductor refrigerating sheets (7) according to the temperature of the battery pack. ​ The variable mechanism comprises an outward heat-conducting plate (2) fixedly connected to the box (1), and a heat-conducting base (10) fixedly connected to the outward heat-conducting plate (2), and a slide rheostat (13) electrically connected to the relay and the plurality of semiconductor refrigerating sheets (7) is arranged on one side of the heat-conducting base (10) and fixedly connected to the heat-conducting base (10), and the box (1) is provided with a resistance adjusting assembly for adjusting the current value of the line in which the slide rheostat (13) is arranged according to the temperature change. The heat-conducting base (10) is fixedly connected with a plurality of inward heat-conducting plates (28), and the plurality of inward heat-conducting plates (28) penetrate through the box (1) and are arranged in the battery pack. The resistance adjusting assembly comprises a middle seat (11) arranged on the heat-conducting base (10), and a transverse sliding groove (12) is formed in the heat-conducting base (10) for sliding connection of the middle seat (11), and an upper rod (15) is arranged on the middle seat (11) and freely moves in the horizontal direction, the slide rheostat (13) comprises an integrally formed resistance ring and a slide piece (131), a connecting rod (14) is fixedly connected to the upper rod (15), and the connecting rod (14) is fixedly connected between the end away from the upper rod (15) and the slide piece (131), and the end of the middle seat (11) away from the slide rheostat (13) is provided with a mountain-shaped seat (22) slidingly connected to the transverse sliding groove (12), and a first over temperature memory alloy (23) and a second over temperature memory alloy (24) are arranged on the horizontal sides of the mountain-shaped seat (22), respectively, a V-shaped swing rod (16) is arranged on the middle seat (11), and the middle part of the V-shaped swing rod (16) is pivotally arranged on the middle seat (11), and a same position pin (17) is fixedly connected to the end of the V-shaped swing rod (16) facing the upper rod (15), and a same position groove (18) is formed in the upper rod (15) for sliding connection of the same position pin (17), an edge rod (19) is arranged on the heat-conducting base (10) and is arranged at a right angle with the upper rod (15), and a groove two is formed in the heat-conducting base (10) for sliding connection of the edge rod (19), a rectangular seat (25) is slidingly connected to the groove two, and a first difference temperature memory alloy (26) and a second difference temperature memory alloy (27) are arranged on the horizontal sides of the rectangular seat (25), respectively, a limiting pin (20) is fixedly connected to the end of the V-shaped swing rod (16) away from the same position pin (17), and a limiting groove (21) is formed in the edge rod (19) for sliding connection of the limiting pin (20), and the first difference temperature memory alloy (26) and the second difference temperature memory alloy (27) are in an elongated deformation state in the set temperature range of the battery pack.

2. The new energy vehicle battery box heat exchange device according to claim 1, characterized in that: A groove one is formed in the middle seat (11) for sliding connection of the upper rod (15).

3. The new energy automobile battery box heat exchange device according to claim 2, characterized in that: The two ends of the super-set No. 1 temperature memory alloy (23) are respectively fixedly connected to the heat-conducting base (10) and the gable seat (22), and the two ends of the super-set No. 2 temperature memory alloy (24) are respectively fixedly connected to the gable seat (22) and the super-set No. 2 temperature memory alloy (24).

4. The new energy vehicle battery box heat exchange device according to claim 3, characterized in that: The two ends of the difference-set No. 1 temperature memory alloy (26) are respectively fixedly connected to the side position rod (19) and the rectangular seat (25).

5. The new energy vehicle battery box heat exchange device according to claim 4, characterized in that: The two ends of the difference-set No. 2 temperature memory alloy (27) are respectively fixedly connected to the rectangular seat (25) and the heat-conducting base (10).

6. The new energy vehicle battery box heat exchange device according to claim 1, characterized in that: The outer side of the box body (1) is fixedly connected with a plurality of groups of side sealing plates (5), a plurality of groups of installation through grooves (6) for clamping and fixing the semiconductor refrigeration pieces (7) and arranged in a rectangular array are formed in the side sealing plates (5).

7. A new energy vehicle battery box heat exchange assembly applied to the new energy vehicle battery box heat exchange device of any one of claims 1-6, characterized in that: A plurality of groups of heat dissipation fans (3) driven by the motor to rotate freely are arranged below the inner bracket (4), the heat dissipation fans (3) rotate on the box body (1) in a fixed shaft mode, and the box body (1) is provided with heat dissipation channel holes (8) corresponding to the positions of the heat dissipation fans (3); Ventilation openings for air circulation are formed in the inner bracket (4), the box body (1) is internally provided with a liquid circulation pipeline for heat exchange inside the battery pack, and the box body (1) is provided with pipeline positioning holes (9) for the liquid circulation pipeline to penetrate.

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