Self-heating detection device and method for new energy automobile battery pack production

Abstract

The invention relates to the technical field of battery pack detection, in particular to a self-heating detection device and method for new energy automobile battery pack production. The self-heating detection device comprises a foundation seat, the foundation seat comprises a detection table and a placement top seat, the detection table is a foundation base, through the cooperation of a placement concave frame and a lifting sealing top cover, when a battery pack is placed, the space of the battery pack placed on a real chassis is simulated, and the detection accuracy is improved. Meanwhile, cold flow or hot flow can be conducted to the evaporation calandria through the cold-heat exchange piece, and the cold flow or the hot flow is blown to the position under the placement concave frame in the horizontal direction under blowing of the blowing mechanism, so that the cold flow or the hot flow generated at the chassis when the vehicle moves in a cold or hot environment is simulated; temperature data of the battery pack in a simulated environment can be transmitted outwards through the temperature sensors on the upper side and the lower side of the battery pack.

Description

Technical Field

[0001] The present invention relates to the technical field of battery pack detection, and in particular to a self-heating detection device and method for producing battery packs for new energy vehicles. Background Art

[0002] The current mainstream of new energy vehicles is to use battery packs to provide electricity to drive the vehicle. In order to ensure battery life, most of them will carry a large battery with a voltage of dozens or even hundreds of degrees. In order to provide sufficient power for the motor, the voltage of this type of battery pack is as high as several hundred volts.

[0003] Since the chemical properties of the battery are affected by the materials, the discharge performance of the battery pack in cold and hot environments is completely different. At low temperatures, its discharge efficiency and power consumption will increase. In order to cope with this situation, most new energy vehicles will have a heating structure on the outside of the battery pack to provide heat to the battery pack and ensure that the battery pack can be at a temperature suitable for discharge even in low temperature environments.

[0004] When the battery pack leaves the factory, it is necessary to inspect the battery pack and the external heating structure to determine the heating stability and the impact of temperature on the power supply performance of the battery pack. This type of battery pack heating mostly uses a temperature sensor to fit the battery, and then starts the heating structure to measure the temperature of the battery pack through the temperature sensor. In addition, after heating, the battery pack is connected through an electrical connection structure to test the power supply performance of the battery pack, and the changes in the power supply performance of the battery pack at different heating temperatures are obtained.

[0005] The battery pack is installed on the chassis of the vehicle during actual use. The top of the battery pack is blocked and the bottom is at a certain distance from the ground, so that when the vehicle is driving, wind will continue to flow through the bottom of the battery pack. When the weather is cold, the temperature at the bottom of the battery pack will be different from the temperature at the top. During the heating test of the battery pack before leaving the factory, the battery pack is mostly heated and tested directly, which cannot simulate the real scene of the battery pack during use, so there will still be a certain deviation from the actual use during the test. Summary of the invention

[0006] The purpose of the present invention is to provide a self-heating detection device and method for the production of new energy vehicle battery packs, so as to solve the problem that direct heating and detection of the battery pack cannot simulate the real scene of the battery pack being installed on the new energy vehicle during use, thereby causing a certain deviation between the battery pack detection and actual use.

[0007] In order to achieve the above-mentioned object, the present invention provides a self-heating detection device for the production of new energy vehicle battery packs, including a base, the base including a detection platform and a placement top seat, the detection platform is a base base, and the placement top seat is arranged at the end of the detection platform; A detection mechanism, the detection mechanism comprising a chassis simulation component, a temperature detection sensor component, an ambient wind simulation component and a battery pack detection component, the chassis simulation component being arranged on the top surface of the detection table, and a simulated chassis placement space for placing the battery pack being arranged in the chassis simulation component; The temperature detection sensor assembly is arranged on the upper and lower sides of the chassis simulation assembly, and the detection ends of the temperature detection sensor assembly are distributed on the upper and lower sides of the simulated chassis placement space, the environmental wind simulation assembly is arranged at the lower ends of both sides of the chassis simulation assembly, and the wind flow of the environmental wind simulation assembly flows under the simulated chassis placement space, and the battery pack detection assembly is arranged on both sides of the chassis simulation assembly; The environmental wind simulation component includes a hot and cold generator and a blower mechanism, and the hot and cold generator includes a hot and cold exchange component and an evaporative exhaust pipe. The blower mechanisms are grouped into two and are respectively arranged at the lower ends of both sides of the chassis simulation component, and the airflow blown out by the blower mechanism will flow directly under the chassis simulation component. The hot and cold exchange component is provided in two groups, which are respectively arranged between the two blower mechanisms and the lower end of the chassis simulation component. One end of the evaporative exhaust pipe is connected to the hot and cold exchange component, and the other end is arranged on the air outlet side of the blower mechanism.

[0008] As a further improvement of the present technical solution, the chassis simulation assembly includes a placement recess, a lifting cap and a connecting window, the placement recess is arranged above the inspection table, the lifting cap is arranged on the placement top seat, and the lifting cap is opposite to the placement recess, and the connecting window is opened at the edge of the placement recess and the lifting cap, and is opposite to the connection inspection end of the battery pack inspection assembly.

[0009] As a further improvement of the present technical solution, the lifting capping cover includes a lifting drive push rod and a capping shielding cover. The lifting drive push rod is vertically arranged in the middle of the mounting top seat, and the output end of the lifting drive push rod passes through the mounting top seat and is connected to the top of the capping shielding cover. The capping shielding cover is a metal top cover, and the length and width of the capping shielding cover are both smaller than the length and width of the concave part of the mounting recessed frame.

[0010] As a further improvement of the technical solution, an arc-shaped extrusion block is arranged on the inner side of the bottom end of the capping shielding cover.

[0011] As a further improvement of the present technical solution, the temperature detection sensor assembly includes an upper temperature detection component and a lower temperature detection component. The upper temperature detection component is vertically arranged on the cover body of the capping shielding cover, and the detection end of the upper temperature detection component is facing the mounting recess below the capping shielding cover. The lower temperature detection component is arranged on the inner side of the detection platform, and the detection end of the lower temperature detection component vertically passes through the gap of the mounting recess.

[0012] As a further improvement of the technical solution, the upper temperature detection member includes an outer ring sleeve, an annular insulating sleeve and a temperature sensor, the outer ring sleeves are multiple in a group and are movably mounted on the top wall of the cover body of the capping shielding cover in the vertical direction, the annular insulating sleeve is arranged at the bottom end of the outer ring sleeve, and the temperature sensor passes through the outer ring sleeve and the annular insulating sleeve and faces the placement recess below the capping shielding cover; Wherein, the sensing part of the temperature sensor is located inside the annular insulating sleeve.

[0013] As a further improvement of the present technical solution, the lower temperature detection component includes a lifting sleeve, an extrusion spring component and a temperature sensor. The lifting sleeves are arranged in a group and vertically slide on the top wall of the detection platform, and the end of the lifting sleeve passes through the gap of the mounting recess. The extrusion spring component is arranged between the lifting sleeve and the top wall of the detection platform. The temperature sensor passes through the lifting sleeve, and the sensing part of the temperature sensor is located at the top end of the lifting sleeve.

[0014] As a further improvement of the present technical solution, the battery pack detection assembly includes a detection body and a connecting plug. The detection body is a device capable of detecting voltage and power. Multiple connecting plugs are grouped together, and one end of the connecting plug is connected to the detection body, and the other end is facing the connecting window.

[0015] The second object of the present invention is to provide a new energy vehicle battery pack detection method, including any one of the above-mentioned new energy vehicle battery pack production self-heating detection devices, including the following method steps: S1. First, place the battery pack from the top of the inner recess of the placement recess. At this time, when the battery pack slides into the inner recess of the placement recess, the bottom wall of the battery pack will contact the lifting sleeve and the temperature sensor in the lifting sleeve, and finally fall into the bottom wall of the inner recess of the placement recess. Under the elastic force of the extrusion spring, the temperature sensor part of the lower temperature detection part will be close to the bottom wall of the battery pack. Then, the lifting drive push rod is started to drive the capping shielding cover to move downward. When the capping shielding cover moves downward, the annular insulating sleeve at the bottom end of the outer ring sleeve and the temperature sensor will contact the top wall of the battery pack. S2. As the capping shielding cover continuously moves downwards at the concave part of the mounting recess, the arc-shaped extrusion block on the inner side of the bottom end of the capping shielding cover will squeeze and guide the battery pack to move to the middle of the capping shielding cover during the downward movement, so that the battery pack is placed in the middle of the concave part of the mounting recess and the bottom wall of the capping shielding cover. At this time, the end of the battery pack is covered by the capping shielding cover, and the bottom end is placed through the mounting recess. At the same time, the connectors on both sides of the battery pack will face the connecting windows of the side walls of the lifting capping cover, thereby simulating the placement method and placement space of the battery pack on the chassis of a new energy vehicle; S3, supply power to the battery pack through the connecting end of the battery pack detection assembly through the connecting window on one side of the lifting capping cover and connect the battery pack, at which time the battery pack will self-heat; S4. Start the cold and hot exchange component and guide the cold flow or hot flow to the evaporative exhaust pipe. At this time, under the blowing of the hair dryer, the cold flow or hot flow will flow horizontally under the mounting recess, thereby simulating the cold flow or hot flow generated at the chassis when the vehicle moves. At this time, the temperature data of the battery pack in the simulated environment can be transmitted to the outside through the temperature sensors on the upper and lower sides of the battery pack. At the same time, the detection subject can detect the power supply and power data of the battery pack under the influence of different cold and hot wind flows, thereby completing the detection of the battery pack.

[0016] Compared with the prior art, the present invention provides a self-heating detection device and method for new energy vehicle battery pack production, which has the following beneficial effects: The present invention, through the cooperation of the placement recess and the lifting capping cover, can simulate the space of the battery pack when it is placed in a real chassis when the battery pack is placed. At the same time, the cold flow or hot flow can be guided to the evaporative exhaust pipe through the cold and hot exchange component, and under the blowing of the blowing mechanism, the cold flow or hot flow is blown horizontally to the bottom of the placement recess, thereby simulating the cold flow or hot flow generated at the chassis when the vehicle moves in a relatively cold or hot environment. At this time, the temperature data of the battery pack in the simulated environment can be transmitted to the outside through the temperature sensors on the upper and lower sides of the battery pack, and then the connection plug of the detection body is used to pass through the connecting window and connect the battery pack, so as to obtain the power supply and power consumption data of the battery pack close to the actual use environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall structure after the capping shielding cover in the present invention is raised; Figure 3 This is a schematic diagram of the overall structure of the present invention from another perspective; Figure 4 It is a schematic diagram of the structural distribution of the ambient wind simulation component and the chassis simulation component in the present invention; Figure 5 It is a cross-sectional view of the overall structure of the present invention; Figure 6 It is a partial structural cross-sectional view of the present invention; Figure 7 It is a schematic diagram of the structural distribution of the battery pack, the upper temperature detection component and the lower temperature detection component in the present invention; Figure 8 It is a schematic diagram of the structural disassembly of the present invention; Fig. 9 It is a schematic diagram of the structural distribution of the lifting capping cover and the upper temperature detection component in the present invention.

[0018] In the figure: 1. test bench; 2. top seat; 3. chassis simulation component; 31. recessed rack; 32. lifting capping cover; 321. lifting drive push rod; 322. capping shielding cover; 33. connecting window; 4. temperature detection sensor component; 41. upper temperature detection part; 411. outer ring sleeve; 412. annular insulating sleeve; 42. lower temperature detection part; 421. lifting sleeve; 422. extrusion spring part; 5. environmental wind simulation component; 51. hot and cold generator; 511. hot and cold exchange part; 512. evaporation exhaust pipe; 52. blower mechanism; 6. battery pack detection component; 61. detection body; 62. connecting plug. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] Reference Figure 1-9 A self-heating detection device for the production of new energy vehicle battery packs is provided. In order to simulate the placement environment of the battery pack in the chassis of the new energy vehicle and the wind flow passing through the bottom of the battery pack in the cold and hot environment, and to detect the heating performance and electrical performance of the battery pack in the environment and scenario, the device includes a base and a detection mechanism. The base includes a detection platform 1 and a placement top seat 2. The detection platform 1 is the basic base, and the placement top seat 2 is arranged at the end of the detection platform 1; The detection mechanism includes a chassis simulation component 3, a temperature detection sensor component 4, an ambient wind simulation component 5 and a battery pack detection component 6. The chassis simulation component 3 is arranged on the top surface of the detection platform 1, and a simulated chassis placement space for placing the battery pack is arranged in the chassis simulation component 3; The temperature detection sensor assembly 4 is arranged on the upper and lower sides of the chassis simulation assembly 3, and the detection ends of the temperature detection sensor assembly 4 are distributed on the upper and lower sides of the simulated chassis placement space. The environmental wind simulation assembly 5 is arranged at the lower ends of both sides of the chassis simulation assembly 3, and the wind flow of the environmental wind simulation assembly 5 flows under the simulated chassis placement space. The battery pack detection assembly 6 is arranged on both sides of the chassis simulation assembly 3; The environmental wind simulation component 5 includes a hot and cold generator 51 and a blower mechanism 52. The hot and cold generator 51 includes a hot and cold exchange component 511 and an evaporative exhaust pipe 512. The two blower mechanisms 52 are arranged in a group at the lower ends of both sides of the chassis simulation component 3, and the airflow blown out by the blower mechanism 52 will flow directly under the chassis simulation component 3. There are two groups of hot and cold exchange components 511, which are respectively arranged between the two blower mechanisms 52 and the lower end of the chassis simulation component 3. One end of the evaporative exhaust pipe 512 is connected to the hot and cold exchange component 511, and the other end is arranged on the air outlet side of the blower mechanism 52. Through the action of the hot and cold exchange component 511 and the evaporative exhaust pipe 512, the airflow blown out by the blower mechanism 52 can be converted into cold air or hot air, and flow directly under the chassis simulation component 3. Therefore, when the battery pack is placed in the chassis simulation component 3 for testing, the chassis simulation component 3 and the hot and cold airflows below can be used to simulate the actual battery pack usage scenario.

[0021] The chassis simulation component 3 includes a placement recess 31, a lifting capping cover 32 and a connecting window 33. The placement recess 31 is arranged above the testing platform 1, the lifting capping cover 32 is arranged on the placement top seat 2, and the lifting capping cover 32 is opposite to the placement recess 31. The connecting window 33 is opened at the edge of the placement recess 31 and the lifting capping cover 32, and is opposite to the connection detection end of the battery pack detection component 6.

[0022] The lifting capping cover 32 includes a lifting drive push rod 321 and a capping shielding cover 322. The lifting drive push rod 321 is vertically arranged in the middle of the mounting top seat 2, and the output end of the lifting drive push rod 321 passes through the mounting top seat 2 and is connected to the top of the capping shielding cover 322. The capping shielding cover 322 is a metal top cover, and the length and width of the capping shielding cover 322 are smaller than the length and width of the concave part of the mounting recess 31, so that when the battery pack is placed in the concave part of the mounting recess 31, the capping shielding cover 322 can be moved downward to cover the top of the battery pack.

[0023] like Fig. 9 As shown, an arc-shaped extrusion block is provided on the inner side of the bottom end of the top shielding cover 322. When the battery pack is placed in the recess of the placement recess 31, it is impossible to ensure that the distance between the four sides of the battery pack and the four sides of the placement recess 31 is reasonable. When the top shielding cover 322 is moved down, the arc-shaped extrusion block is used to squeeze the edge of the battery pack, so that the battery pack can be squeezed to the middle of the top shielding cover 322. At this time, the battery pack is also located in the middle of the placement recess 31. At this time, the connectors of the battery pack are all facing the part of the connecting window 33, which is convenient for the subsequent connection and electrical detection using the battery pack detection component 6. Figure 4 As shown, the battery pack is placed in the recessed position of the mounting recess 31, which can be easily inspected.

[0024] The temperature detection sensor assembly 4 includes an upper temperature detection component 41 and a lower temperature detection component 42. The upper temperature detection component 41 is vertically arranged on the cover body of the capping shielding cover 322, and the detection end of the upper temperature detection component 41 is facing the mounting recess 31 below the capping shielding cover 322. The lower temperature detection component 42 is arranged on the inner side of the detection platform 1, and the detection end of the lower temperature detection component 42 passes through the gap of the mounting recess 31 in the vertical direction.

[0025] The upper temperature detection member 41 includes an outer ring sleeve 411, an annular insulating sleeve 412 and a temperature sensor. The outer ring sleeves 411 are grouped together and are movably mounted on the top wall of the capping shielding cover 322 in the vertical direction. The annular insulating sleeve 412 is arranged at the bottom end of the outer ring sleeve 411. The temperature sensor passes through the outer ring sleeve 411 and the annular insulating sleeve 412 and faces the placement recess 31 below the capping shielding cover 322. Among them, the sensing part of the temperature sensor is located inside the annular insulating sleeve 412, so that when the annular insulating sleeve 412 at the bottom end of the outer ring sleeve 411 is attached to the surface of the battery pack, it can isolate the influence of the outside world on the internal temperature sensor sensing part.

[0026] The lower temperature detection component 42 includes a lifting sleeve 421, an extrusion spring component 422 and a temperature sensor. The lifting sleeves 421 are arranged in a group and vertically slide on the top wall of the detection platform 1, and the end of the lifting sleeve 421 passes through the gap of the mounting recess 31. The extrusion spring component 422 is arranged between the lifting sleeve 421 and the top wall of the detection platform 1. The temperature sensor passes through the lifting sleeve 421, and the sensing part of the temperature sensor is located at the top end of the lifting sleeve 421.

[0027] It should be clear that the temperature sensor of the upper temperature detection component 41 and the temperature sensor of the lower temperature detection component 42 are both connected to external equipment, so that the obtained temperature data can be transmitted to complete the temperature detection of the battery pack.

[0028] The battery pack detection component 6 includes a detection body 61 and a connection plug 62. The detection body 61 is a device capable of detecting voltage and power. A plurality of connection plugs 62 are grouped together, and one end of the connection plug 62 is connected to the detection body 61, and the other end faces the communication window 33.

[0029] The working principle is as follows: first, the battery pack is placed from above the concave part of the mounting recess 31, and then the lifting drive push rod 321 is started to drive the capping shielding cover 322 to move downward, and the capping shielding cover 322 is inserted into the concave part of the mounting recess 31 and continues to move downward. At this time, the arc-shaped extrusion block on the inner side of the bottom end of the capping shielding cover 322 will squeeze and guide the battery pack to move to the middle of the capping shielding cover 322, so that the battery pack is placed between the concave part of the mounting recess 31 and the capping shielding cover 322. At this time, the end of the battery pack is blocked by the capping shielding cover 322, and the bottom end is mounted through the mounting recess 31, simulating the mounting method and mounting space of the battery pack on the chassis of the new energy vehicle. At the same time, the capping shielding cover 322 covers the top of the battery pack, and the annular isolation sleeve 412 and the temperature sensor at the bottom of the outer ring sleeve 411 will contact the top wall of the battery pack, and below the battery pack, the lifting sleeve 421 and the temperature sensor in the lifting sleeve 421 will squeeze the spring member 4 Under the action of the elastic force of 22, it presses against the bottom wall of the battery pack. At this time, the connecting plug 62 of the detection body 61 can pass through the connecting window 33 and connect to the battery pack to supply power to the battery pack. At this time, the battery pack will self-heat, and then start the hot and cold exchange component 511 to guide the cold flow or hot flow to the evaporative exhaust pipe 512. At this time, under the blowing of the hair dryer 52, the wind flow containing the cold flow or hot flow will flow horizontally under the mounting recess 31, thereby simulating the cold flow or hot flow generated at the chassis when the vehicle moves. At this time, the temperature data of the battery pack in the simulated environment can be transmitted to the outside through the temperature sensors on the upper and lower sides of the battery pack. At the same time, the detection body 61 can also detect the power supply and power data of the battery pack under the influence of different cold and hot wind flows, so that the battery pack can be tested in the simulated chassis environment and under the influence of different cold and hot wind flows, and the data of the battery pack close to the real environment can be obtained.

[0030] A battery pack detection method using the self-heating detection device for new energy vehicle battery pack production is provided, and the method steps are as follows: S1. First, place the battery pack from the top of the inner recess of the placement recess 31. At this time, when the battery pack slides into the inner recess of the placement recess 31, the bottom wall of the battery pack will contact the lifting sleeve 421 and the temperature sensor in the lifting sleeve 421, and finally fall into the bottom wall of the inner recess of the placement recess 31. Under the elastic force of the extrusion spring member 422, the temperature sensor part of the lower temperature detection member 42 will be close to the bottom wall of the battery pack. Then, the lifting drive push rod 321 is started to drive the capping shielding cover 322 to move downward. When the capping shielding cover 322 moves downward, the annular insulating sleeve 412 at the bottom end of the outer ring sleeve 411 and the temperature sensor will contact the top wall of the battery pack. S2. During the continuous downward movement of the capping shielding cover 322 at the concave part of the mounting recess 31, the arc-shaped extrusion block on the inner side of the bottom end of the capping shielding cover 322 will squeeze and guide the battery pack to move to the middle of the capping shielding cover 322 during the downward movement, so that the battery pack is placed in the middle of the concave part of the mounting recess 31 and the bottom wall of the capping shielding cover 322. At this time, the end of the battery pack is blocked by the capping shielding cover 322, and the bottom end is placed through the mounting recess 31. At the same time, the connector parts on both sides of the battery pack will face the connecting window 33 on the side wall of the lifting capping cover 32, thereby simulating the placement method and placement space of the battery pack on the chassis of the new energy vehicle; S3, the connection end of the battery pack detection assembly 6 passes through the communication window 33 on one side of the lifting capping cover 32 and connects the battery pack to supply power to the battery pack, at which time the battery pack will self-heat; S4. Start the cold and hot exchange component 511 and guide the cold flow or hot flow to the evaporative exhaust pipe 512. At this time, under the blowing of the blower mechanism 52, the cold flow or hot flow will flow horizontally under the mounting recess 31, thereby simulating the cold flow or hot flow generated at the chassis when the vehicle moves. At this time, the temperature data of the battery pack in the simulated environment can be transmitted to the outside through the temperature sensors on the upper and lower sides of the battery pack. At the same time, the detection body 61 can detect the power supply and power data of the battery pack under the influence of different cold and hot wind currents, thereby completing the detection of the battery pack.

[0031] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A self-heating detection device for new energy vehicle battery pack production, characterized in that: include: A base, the base comprising a detection platform (1) and a placement top seat (2), the detection platform (1) being a base, and the placement top seat (2) being arranged at the end of the detection platform (1); A detection mechanism, the detection mechanism comprising a chassis simulation component (3), a temperature detection sensor component (4), an ambient wind simulation component (5) and a battery pack detection component (6), the chassis simulation component (3) being arranged on the top surface of the detection platform (1), and a simulated chassis placement space for placing the battery pack being arranged in the chassis simulation component (3); The temperature detection sensor component (4) is arranged on the upper and lower sides of the chassis simulation component (3), and the detection ends of the temperature detection sensor component (4) are distributed on the upper and lower sides of the simulated chassis placement space; the environmental wind simulation component (5) is arranged at the lower ends of both sides of the chassis simulation component (3), and the wind flow of the environmental wind simulation component (5) flows through the bottom of the simulated chassis placement space; and the battery pack detection component (6) is arranged on both sides of the chassis simulation component (3); The environmental wind simulation component (5) comprises a cold and heat generator (51) and a blower mechanism (52); the cold and heat generator (51) comprises a cold and heat exchange component (511) and an evaporation exhaust pipe (512); two of the blower mechanisms (52) are arranged in a group at the lower ends of both sides of the chassis simulation component (3), and the airflow blown out by the blower mechanisms (52) will flow directly below the chassis simulation component (3); the cold and heat exchange component (511) is arranged in two groups, which are arranged between the two blower mechanisms (52) and the lower ends of the chassis simulation component (3); one end of the evaporation exhaust pipe (512) is connected to the cold and heat exchange component (511), and the other end is arranged on the air outlet side of the blower mechanism (52).

2. A self-heating detection device for new energy vehicle battery pack production according to claim 1, characterized in that: The chassis simulation component (3) comprises a placement recess (31), a lifting capping cover (32) and a communication window (33); the placement recess (31) is arranged above the detection platform (1); the lifting capping cover (32) is arranged on the placement top seat (2), and the lifting capping cover (32) is directly opposite to the placement recess (31); and the communication window (33) is provided at the edges of the placement recess (31) and the lifting capping cover (32), and is directly opposite to the connection detection end of the battery pack detection component (6).

3. A self-heating detection device for new energy vehicle battery pack production according to claim 2, characterized in that: The lifting capping cover (32) comprises a lifting driving push rod (321) and a capping shielding cover (322); the lifting driving push rod (321) is vertically arranged in the middle of the mounting top seat (2); and the output end of the lifting driving push rod (321) passes through the mounting top seat (2) and is connected to the top of the capping shielding cover (322); the capping shielding cover (322) is a metal top cover, and the length and width of the capping shielding cover (322) are both smaller than the length and width of the inner concave portion of the mounting recessed frame (31).

4. A self-heating detection device for new energy vehicle battery pack production according to claim 3, characterized in that: An arc-shaped extrusion block is arranged on the inner side of the bottom end of the capping shielding cover (322).

5. A self-heating detection device for new energy vehicle battery pack production according to claim 2, characterized in that: The temperature detection sensor assembly (4) comprises an upper temperature detection component (41) and a lower temperature detection component (42); the upper temperature detection component (41) is arranged on the cover body of the capping shielding cover (322) in a vertical direction, and the detection end of the upper temperature detection component (41) faces the mounting recess (31) below the capping shielding cover (322); the lower temperature detection component (42) is arranged on the inner side of the detection platform (1), and the detection end of the lower temperature detection component (42) passes through the gap of the mounting recess (31) in a vertical direction.

6. A self-heating detection device for new energy vehicle battery pack production according to claim 5, characterized in that: The upper temperature detection member (41) comprises an outer ring sleeve (411), an annular insulating sleeve (412) and a temperature sensor. The outer ring sleeves (411) are provided in a group and are movably mounted in a vertical direction on the top wall of the cover body of the capping shielding cover (322). The annular insulating sleeve (412) is arranged at the bottom end of the outer ring sleeve (411). The temperature sensor passes through the outer ring sleeve (411) and the annular insulating sleeve (412) and faces the mounting recess (31) below the capping shielding cover (322). The sensing part of the temperature sensor is located inside the annular isolation sleeve (412).

7. A self-heating detection device for new energy vehicle battery pack production according to claim 5, characterized in that: The lower temperature detection component (42) comprises a lifting sleeve (421), a compression spring component (422) and a temperature sensor; the lifting sleeves (421) are arranged in a group and vertically slide on the top wall of the detection platform (1); the end of the lifting sleeve (421) passes through a gap of the mounting recess (31); the compression spring component (422) is arranged between the lifting sleeve (421) and the top wall of the detection platform (1); the temperature sensor passes through the lifting sleeve (421), and the sensing part of the temperature sensor is located at the top end of the lifting sleeve (421).

8. A self-heating detection device for new energy vehicle battery pack production according to claim 2, characterized in that: The battery pack detection assembly (6) comprises a detection body (61) and a connection plug (62); the detection body (61) is a device capable of detecting voltage and electric quantity; a plurality of connection plugs (62) form a group, and one end of the connection plug (62) is connected to the detection body (61), and the other end faces the communication window (33).

9. A detection method based on the self-heating detection device for production of new energy vehicle battery packs according to any one of claims 1 to 8, characterized in that: The method comprises the following steps: S1. First, place the battery pack from above the inner recess of the placement recess (31). At this time, when the battery pack slides into the inner recess of the placement recess (31), the bottom wall of the battery pack will contact the lifting sleeve (421) and the temperature sensor in the lifting sleeve (421), and finally fall into the bottom wall of the inner recess of the placement recess (31). Under the elastic force of the extrusion spring member (422), the temperature sensor portion of the lower temperature detection member (42) will be in close contact with the bottom wall of the battery pack. Then, the lifting drive push rod (321) is started to drive the top shielding cover (322) to move downward. When the top shielding cover (322) moves downward, the annular isolation sleeve (412) at the bottom end of the outer ring sleeve (411) and the temperature sensor will contact the top wall of the battery pack. S2. During the continuous downward movement of the capping shielding cover (322) at the inner concave portion of the placement recess (31), the arc-shaped extrusion block on the inner side of the bottom end of the capping shielding cover (322) will squeeze and guide the battery pack to move to the middle of the capping shielding cover (322) during the downward movement, so that the battery pack is placed in the middle of the inner concave portion of the placement recess (31) and the bottom wall of the capping shielding cover (322). At this time, the end of the battery pack is shielded by the capping shielding cover (322), and the bottom end is placed through the placement recess (31). At the same time, the connector portions on both sides of the battery pack will face the connecting window (33) on the side wall of the lifting capping cover (32), thereby simulating the placement method and placement space of the battery pack on the chassis of a new energy vehicle; S3, supplying power to the battery pack through the connecting end of the battery pack detection assembly (6) through the communication window (33) on one side of the lifting capping cover (32) and connecting the battery pack, at which time the battery pack will self-heat; S4, start the cold and hot exchange element (511) and guide the cold flow or hot flow to the evaporation exhaust pipe (512). At this time, under the blowing of the blower mechanism (52), the cold flow or hot flow will flow horizontally through the bottom of the mounting recess (31), thereby simulating the cold flow or hot flow generated at the chassis when the vehicle moves. At this time, the temperature data of the battery pack in the simulated environment can be transmitted to the outside through the temperature sensors on the upper and lower sides of the battery pack. At the same time, the detection body (61) can detect the power supply and power data of the battery pack under the influence of different cold and hot wind currents, thereby completing the detection of the battery pack.

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