CN214010686U - New energy automobile battery package leakproofness test equipment - Google Patents
New energy automobile battery package leakproofness test equipment Download PDFInfo
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- CN214010686U CN214010686U CN202023111308.3U CN202023111308U CN214010686U CN 214010686 U CN214010686 U CN 214010686U CN 202023111308 U CN202023111308 U CN 202023111308U CN 214010686 U CN214010686 U CN 214010686U
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Abstract
The utility model discloses a new energy automobile battery package leakproofness test equipment, including airtight detection device, an airtight frock of explosion-proof valve for sealing up the battery package, a socket airtight plug piece of MSD high-pressure socket mouth for sealing up the battery package, a low pressure communication plug piece of low pressure communication mouth for sealing up the battery package, a battery package sealing loop for sealing up the quick airtight plug piece of the quick airtight plug piece mouth of charging plug piece of battery package and a discharge high pressure plug piece of the discharge high pressure plug piece mouth for sealing up the battery package, airtight detection device has the battery package sealing loop that is used for being connected with the airtight frock of explosion-proof valve, a liquid cooling system sealing loop that is used for being connected with the total delivery port of battery package and be used for the air supply air inlet of being connected with the air supply, the air supply air inlet is connected with battery package sealing loop and liquid cooling system sealing loop. The utility model discloses a new energy automobile battery package leakproofness test equipment can effectively realize the detection to power battery package and liquid cooling system leakproofness fast.
Description
Technical Field
The utility model belongs to the technical field of new energy automobile power battery, specifically speaking, the utility model relates to a new energy automobile battery package leakproofness test equipment.
Background
With the support of the continuous new energy policy of China, the key technology of new energy automobiles in China makes remarkable progress. New energy automobile battery system mainly contains battery module, high pressure link module, low pressure collection module and BMS (battery management system) control module, and each module is extremely high to temperature, humidity requirement, in case battery package and liquid cooling system are sealed to be inefficacy, lead to inside steam and the coolant liquid invade battery package, will cause irreversible consequence to company property and personnel safety, light then lead to system collection unusual, the precision reduces, insulation fault, system outage, heavy then will lead to system circuit ageing, corruption, short circuit to catch fire. The national recommended standard GB/T31467.3-2015 lithium ion power storage battery pack for electric vehicles and part 3 of safety requirements and test methods of the system have the requirement of 2h of seawater immersion, the national mandatory standard GB 38031-safety requirements for power storage batteries for electric vehicles definitely indicate that after a vibration test is carried out on a power storage battery system, the IP protection level needs to meet the IPX7 waterproof requirement (1 m deep underwater for 30min immersion), more and more power storage battery system manufacturers develop power storage battery systems according to the IPX8 and IPX9 standards, and the importance of the sealing of the battery pack system can be seen. Along with the improvement of the endurance mileage and the charge-discharge efficiency requirements of the electric automobile, the structural size of a battery system of the electric automobile is larger and larger, the sealing area is increased along with the increase of the sealing failure risk, more and more battery systems adopt liquid cooling systems with higher heat management efficiency, the internal loops of the liquid cooling systems are complex, the water inlets and the water outlets and the internal branch pipelines of the liquid cooling systems are connected by using more quick plugs, the complex liquid cooling systems have extremely strict requirements on the sealing performance, and in order to ensure that the battery system of the electric automobile can work stably and safely, the corresponding sealing performance detection must be carried out in the production and manufacturing process of the liquid cooling systems.
At present, the electric vehicle battery system tightness testing equipment used in the new energy automobile industry has insufficient functions, the integration level of the testing equipment is low, the testing process is complicated and has low automation degree, the tightness detection of a battery pack and the tightness detection of a liquid cooling system cannot be carried out synchronously, and more station sites and station personnel are required to be invested; the leakage point of the battery system of the electric automobile can not be identified accurately and locked accurately and quickly by the testing equipment used in the industry; meanwhile, the existing test equipment has low precision in the test process, and the test process and the test result are influenced by external temperature, humidity, air pressure and other environmental factors, so that the test process is unstable and the test result is inaccurate.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a new energy automobile battery package leakproofness test equipment, the purpose is realized carrying out quick, effective, accurate detection to new energy automobile battery package and liquid cooling system sealing performance.
In order to realize the purpose, the utility model discloses the technical scheme who takes does: the new energy automobile battery pack tightness test equipment comprises an air tightness detection device, an explosion-proof valve air tightness tool used for sealing an explosion-proof valve on a battery pack, a socket air tightness plug used for sealing an MSD high-voltage socket port of the battery pack, a low-voltage communication plug air tightness plug used for sealing a low-voltage communication port of the battery pack, a quick-charging plug air tightness plug used for sealing a quick-charging high-voltage plug port of the battery pack and a discharging high-voltage plug air tightness plug used for sealing a discharging high-voltage plug port of the battery pack, wherein the air tightness detection device is provided with a battery pack sealing loop used for being connected with the explosion-proof valve air tightness tool, a liquid cooling system sealing loop used for being connected with a main water outlet of the battery pack and an air source air inlet used for being connected with an air source, and the air source air inlet is connected with the battery pack sealing loop and the liquid cooling system sealing loop.
The battery pack sealing loop comprises a first ball valve, a first pneumatic triple piece, a first electromagnetic valve, a second ball valve, a flowmeter, a third electromagnetic valve connected with the first electromagnetic valve, a third ball valve connected with the third electromagnetic valve and a first detection piece connected with the third ball valve, wherein the first ball valve, the first pneumatic triple piece, the first electromagnetic valve, the second ball valve and the flowmeter are sequentially connected, and the flowmeter is connected with the explosion-proof valve airtight tool.
The battery pack sealing loop further comprises a fourth electromagnetic valve connected with the first electromagnetic valve and an exhaust silencer connected with the fourth electromagnetic valve.
The battery pack sealing loop further comprises a first pressure sensor and a first differential pressure sensor, the first pressure sensor is used for detecting pressure values of pipelines connected with the first electromagnetic valve and the second electromagnetic valve, the first differential pressure sensor is used for detecting differential pressure values, one end of the first differential pressure sensor is connected with the pipelines connected with the second electromagnetic valve and the second ball valve, and the other end of the first differential pressure sensor is connected with the third electromagnetic valve and the pipeline connected with the third ball valve.
The liquid cooling system sealing loop comprises a fourth ball valve, a second pneumatic triple piece, a fifth electromagnetic valve, a sixth electromagnetic valve, a seventh electromagnetic valve, an eighth electromagnetic valve, a fifth ball valve and a second detection piece, wherein the fourth ball valve, the second pneumatic triple piece, the fifth electromagnetic valve, the sixth electromagnetic valve and the seventh electromagnetic valve are sequentially connected, the eighth electromagnetic valve is connected with the fifth electromagnetic valve, the fifth ball valve is connected with the eighth electromagnetic valve, the second detection piece is connected with the fifth ball valve, and the seventh electromagnetic valve is connected with a total water.
The liquid cooling system sealing loop further comprises a ninth electromagnetic valve connected with the fifth electromagnetic valve, and the eighth electromagnetic valve and the seventh electromagnetic valve are connected with an exhaust silencer.
The liquid cooling system sealing loop further comprises a second pressure sensor and a second differential pressure sensor, the second pressure sensor is used for detecting pressure values of pipelines of the fifth electromagnetic valve and the sixth electromagnetic valve and is used for detecting a differential pressure value, one end of the second differential pressure sensor is connected with the pipeline of the sixth electromagnetic valve and the pipeline of the seventh electromagnetic valve, and the other end of the second differential pressure sensor is connected with the pipeline of the eighth electromagnetic valve and the pipeline of the fifth ball valve.
The utility model discloses a new energy automobile battery package leakproofness test equipment, the integrated level is high, and test process automation degree is high, detects battery package and liquid cooling system circuit simultaneously through setting up 2 independent return circuits, can effectively realize the detection to power battery package and liquid cooling system leakproofness fast; the high-precision sensor and the electromagnetic valve are adopted to ensure the accuracy of the detection process, and the detection and judgment are carried out in each link of inflation, pressure stabilization and detection, so that whether leakage exists in the battery pack and the liquid cooling system loop or not, the leakage severity and the leakage point general direction can be quickly and effectively locked.
Drawings
The description includes the following figures, the contents shown are respectively:
fig. 1 is a schematic structural diagram of the new energy vehicle battery pack tightness testing device of the present invention;
fig. 2 is a schematic view of the test connection of the new energy vehicle battery pack tightness test device of the present invention;
fig. 3 is a schematic diagram of the testing principle of the new energy vehicle battery pack tightness testing device of the present invention;
FIG. 4 is a schematic diagram of a sealing performance testing step of a new energy automobile battery pack;
FIG. 5 is a schematic diagram of a test equipment set-up procedure;
FIG. 6 is a schematic test flow diagram;
labeled as:
1. a gas source; 2. an air source inlet; 3. an air-tightness detecting device; 4. an air-tightness detection port; 5. an equipment exhaust port; 6. a first water inlet detection port; 7. a second water inlet detection port; 8. a third water inlet detection port; 9. a fourth water inlet detection port; 10. a water outlet detection port; 11. a fifth connecting air pipe; 12. a fourth connecting air pipe; 13. a third connecting air pipe; 14. a second connecting air pipe; 15. a first connecting air pipe; 16. an exhaust pipe; 17. a sixth connecting air pipe; 18. an explosion-proof valve airtight tool; 19. a low-voltage communication plug-in airtight plug-in; 20. the quick-charging plug-in is airtight and blocked; 21. an airtight plug for the discharge high-voltage plug-in unit; 22. a socket airtight closure; 23. MSD high voltage socket port; 24. an explosion-proof valve; 25. a low voltage communication port; 26. a high-pressure plug-in port is quickly filled; 27. a discharge high voltage plug-in port; 28. a first water inlet; 29. a second water inlet; 30. a third water inlet; 31. a fourth water inlet; 32. a main water outlet; 33. a battery pack; 34. a first ball valve; 35. a first pneumatic triplet; 36. a first solenoid valve; 37. a fourth solenoid valve; 38. a first pressure sensor; 39. a second solenoid valve; 40. a second ball valve; 41. a first differential pressure sensor; 42. a third electromagnetic valve; 43. a third ball valve; 44. a first detecting member; 45. a flow meter; 46. an exhaust muffler; 47. a control unit; 48. a fourth ball valve; 49. a second pneumatic triplet; 50. a fifth solenoid valve; 51. an eighth solenoid valve; 52. a second pressure sensor; 53. A sixth electromagnetic valve; 54. a seventh electromagnetic valve; 55. a second differential pressure sensor; 56. an eighth solenoid valve; 57. A fifth ball valve; 58. a second detecting member; 59. a fifth pressure sensor; 60. a sixth pressure sensor; 61. a seventh pressure sensor; 62. an eighth pressure sensor; 63. a battery pack air inlet; 70. and a liquid cooling system.
Detailed Description
The following detailed description of the embodiments of the present invention will be given with reference to the accompanying drawings, for the purpose of helping those skilled in the art to understand more completely, accurately and deeply the conception and technical solution of the present invention, and to facilitate its implementation.
As shown in fig. 1 to fig. 3, the utility model provides a new energy automobile battery pack tightness test device, which comprises an airtight detection device 3, an explosion-proof valve airtight tool 18 for sealing an explosion-proof valve 24 on a battery pack, a socket airtight plug 22 for sealing an MSD high-voltage socket port 23 of the battery pack, a low-voltage communication plug 19 for sealing a low-voltage communication port 25 of the battery pack, a quick-charging plug 20 for sealing a quick-charging high-voltage plug port 26 of the battery pack, and a discharging high-voltage plug 21 for sealing a discharging high-voltage plug port 27 of the battery pack, wherein the airtight detection device 3 is provided with a control unit, a battery pack sealing loop for connecting with the explosion-proof valve airtight tool 18, a liquid cooling system sealing loop for connecting with a main water outlet 32 of the battery pack, and an air source 2 for connecting with the air source 1, the air source 2 is connected with the battery pack sealing loop and the liquid cooling system sealing loop, the liquid cooling system sealing loop is used for guiding gas to the liquid cooling plate of the liquid cooling system in the battery pack through the main water outlet 32 of the battery pack, the battery pack sealing loop is used for guiding the gas to the anti-explosion valve 24 of the battery pack, and the gas can enter and exit the battery pack through the semipermeable membrane of the anti-explosion valve 24.
Specifically, as shown in fig. 1 to 3, the battery pack to be tested is placed on the rack, the battery pack has a first water inlet 28, a second water inlet 29, a third water inlet 30, a fourth water inlet 31 and a total water outlet 32, the liquid cooling system includes a plurality of liquid cooling plates, the liquid cooling plates are located below the module assembly, the module assembly is disposed on the top surface of the liquid cooling plates, the liquid cooling plates have a water inlet and a water outlet, a cooling water channel for circulating cooling liquid is disposed inside the liquid cooling plates, the first water inlet 28, the second water inlet 29, the third water inlet 30 and the fourth water inlet 31 are respectively connected to the water inlet of one liquid cooling plate of the liquid cooling system, and the total water outlet 32 is connected to the water outlets of all the liquid cooling plates of the liquid cooling system. The battery pack is provided with an explosion-proof valve 24, an MSD high-voltage socket port 23, a low-voltage communication port 25, a discharging high-voltage plug port 27 and a quick-charging high-voltage plug port 26, an outer envelope structure of the explosion-proof valve 24 is sealed by an explosion-proof valve airtight tool 18, gas entering the explosion-proof valve 24 can enter and exit the battery pack through a base film of the explosion-proof valve 24, and the structure of the explosion-proof valve airtight tool 18 is known by persons skilled in the art and is not described herein again.
As shown in fig. 3, the battery pack sealing loop includes a first ball valve 34, a first pneumatic triple 35, a first solenoid valve 36, a second solenoid valve 39, a second ball valve 40, a flow meter 45, a third solenoid valve 42 connected to the first solenoid valve 36, a third ball valve 43 connected to the third solenoid valve 42, and a first detection piece 44 connected to the third ball valve 43, which are connected in sequence, and the flow meter 45 is connected to the explosion-proof valve airtight tool 18. The air inlet of first ball valve 34 is connected with air supply air inlet 2, air supply air inlet 2 links to be connected with mill's air supply 1, the gas outlet of first ball valve 34 is connected with the air inlet of first pneumatic trigeminy piece 35, the gas outlet of first pneumatic trigeminy piece 35 is connected with the air inlet of first solenoid valve 36, the gas outlet of first solenoid valve 36 is connected with the air inlet of second solenoid valve 39 and the air inlet of third solenoid valve 42, the gas outlet of second solenoid valve 39 is connected with the air inlet of second ball valve 40, the gas outlet of second ball valve 40 is connected with the air inlet of flowmeter 45, the gas outlet of flowmeter 45 is connected with explosion-proof valve airtight frock 18 through sixth connecting gas pipe 17, the gas outlet of flowmeter 45 is as the airtight detection mouth of battery package sealing circuit. The air outlet of the third electromagnetic valve 42 is connected with the air inlet of the third ball valve 43, and the air outlet of the third ball valve 43 is connected with the first detection piece 44. The first pneumatic triple 35 is an FRL pneumatic triple, and is composed of an air filter, a pressure reducing valve and an oil atomizer, and the structure thereof is well known to those skilled in the art and will not be described herein.
As shown in fig. 3, the battery pack sealing circuit further includes a fourth solenoid valve 37 connected to the first solenoid valve 36 and an exhaust muffler connected to the fourth solenoid valve 37. An air inlet of the fourth electromagnetic valve 37 is connected with an air outlet of the first electromagnetic valve 36, and an air outlet of the fourth electromagnetic valve 37 is connected with an air inlet of the exhaust silencer.
As shown in fig. 3, the battery pack sealing circuit further includes a first pressure sensor 38 for detecting a pressure value at a pipe connecting the first solenoid valve 36 and the second solenoid valve 39, and a first differential pressure sensor 41 for detecting a differential pressure value, one end of the first differential pressure sensor 41 being connected to the pipe connecting the second solenoid valve 39 and the second ball valve 40, and the other end of the first differential pressure sensor 41 being connected to a pipe connecting the third solenoid valve 42 and the third ball valve 43. The first solenoid valve 36, the second solenoid valve 39, the flow meter 45, the third solenoid valve 42, the fourth solenoid valve 37, the first pressure sensor 38 and the first differential pressure sensor 41 are electrically connected to the control unit.
As shown in fig. 3, the liquid cooling system sealing loop includes a fourth ball valve 48, a second pneumatic triple piece 49, a fifth solenoid valve 50, a sixth solenoid valve 53, and a seventh solenoid valve 54, which are connected in sequence, an eighth solenoid valve 56 connected to the fifth solenoid valve 50, a fifth ball valve 57 connected to the eighth solenoid valve 56, and a second detecting piece 58 connected to the fifth ball valve 57, where the seventh solenoid valve 54 is connected to the total water outlet 32 of the battery pack. An air inlet of the fourth ball valve 48 is connected with the air source air inlet 2, an air outlet of the fourth ball valve 48 is connected with an air inlet of the second pneumatic triple piece 49, an air outlet of the second pneumatic triple piece 49 is connected with an air inlet of the fifth electromagnetic valve 50, an air outlet of the fifth electromagnetic valve 50 is connected with an air inlet of the sixth electromagnetic valve 53 and an air inlet of the eighth electromagnetic valve 56, an air outlet of the sixth electromagnetic valve 53 is connected with an air inlet of the seventh electromagnetic valve 54, the seventh electromagnetic valve 54 is a three-way electromagnetic valve, an air outlet of the seventh electromagnetic valve 54 is connected with the total water outlet 32 of the battery pack, the air outlet of the seventh electromagnetic valve 54 is used as a water outlet detection port of the liquid cooling system sealing loop, and the other air outlet of the seventh electromagnetic valve 54 is connected with an. An air outlet of the eighth electromagnetic valve 56 is connected with an air inlet of the fifth ball valve 57, and an air outlet of the fifth ball valve 57 is connected with the second detection member 58. The second pneumatic triplet 49 is an FRL pneumatic triplet, which is composed of an air filter, a pressure reducing valve and an oil atomizer, and the structure thereof is well known to those skilled in the art and will not be described herein.
As shown in fig. 3, the liquid cooling system sealed loop further includes a ninth solenoid valve 51 connected to the fifth solenoid valve 50, and the ninth solenoid valve 51 and the seventh solenoid valve 54 are connected to the exhaust muffler. An air inlet of the ninth electromagnetic valve 51 is connected with an air outlet of the fifth electromagnetic valve 50, and an air outlet of the ninth electromagnetic valve 51 is connected with an air inlet of the exhaust silencer.
As shown in fig. 3, the liquid cooling system sealed circuit further includes a second pressure sensor 52 for detecting a pressure value at a pipe connecting the fifth solenoid valve 50 and the sixth solenoid valve 53, and a second differential pressure sensor 55 for detecting a differential pressure value. One end of the second differential pressure sensor 55 is connected to a pipe connecting the sixth solenoid valve 53 and the seventh solenoid valve 54, and the other end of the second differential pressure sensor 55 is connected to a pipe connecting the eighth solenoid valve 56 and the fifth ball valve 57. The fifth solenoid valve 50, the sixth solenoid valve 53, the seventh solenoid valve 54, the eighth solenoid valve 56, the ninth solenoid valve 51, the second pressure sensor 52, and the second differential pressure sensor 55 are electrically connected to the control unit.
As shown in fig. 1 to 3, the air tightness detecting device 3 further includes a first connecting air pipe 15 connected to the first water inlet 28 of the battery pack, a second connecting air pipe 14 connected to the second water inlet 29 of the battery pack, a third connecting air pipe 13 connected to the third water inlet 30 of the battery pack, a fourth connecting air pipe 12 connected to the fourth water inlet 31 of the battery pack, a fifth pressure sensor connected to the first connecting air pipe 15, a sixth pressure sensor connected to the second connecting air pipe 14, a seventh pressure sensor connected to the third connecting air pipe 13, and an eighth pressure sensor connected to the fourth connecting air pipe 12. The total water outlet 32 of the battery pack is connected with the air outlet of the seventh electromagnetic valve 54 through the fifth connecting air pipe 11, and during testing, the total water outlet 32 of the battery pack is used for air inlet. The first water inlet 28 of battery package is direct to be connected with the fifth pressure sensor, and the pressure value that still is used for detecting first water inlet 28 when the first water inlet 28 of fifth pressure sensor is sealed. The second water inlet 29 of the battery pack is directly connected with a sixth pressure sensor, and the sixth pressure sensor is used for detecting the pressure value of the second water inlet 29 while sealing the second water inlet 29. The third water inlet 30 of the battery pack is directly connected with a seventh pressure sensor, and the seventh pressure sensor is used for detecting the pressure value of the third water inlet 30 while sealing the third water inlet 30. The fourth water inlet 31 of battery package is direct to be connected with eighth pressure sensor, and eighth pressure sensor still is used for detecting the pressure value that fourth water inlet 31 goes out when sealing fourth water inlet 31.
The testing equipment adopting the structure adopts the gas detection method, so that the testing process is clean and free of risks such as pollution short circuit and the like, and the gas source is stable and convenient. Adopt explosion-proof valve business turn over gas mode, the integrated detection of ventilating on original explosion-proof valve airtight plug for can detect explosion-proof valve base film and have no damage in the testing process, avoid not discovering to produce serious quality problems and consequence because of explosion-proof valve base film damages. During testing, air is fed from a main water outlet 32 of the battery pack, 4 water inlets of the battery pack are respectively connected with a pressure sensor, instantaneous pressure difference of the 4 water inlets is collected in direct flushing, pressure stabilizing and detecting links, if the test is unqualified, an unqualified loop area of the liquid cooling system can be quickly locked and checked and analyzed, and the problem that leakage cannot be locked due to unqualified air tightness is solved. The test equipment can realize the simultaneous detection of the sealing property and the liquid cooling system of the battery pack, the two independent detection loops are not affected with each other, and the detection efficiency and stability are greatly improved.
The semi-permeable membrane of the explosion-proof valve on the battery pack is easy to damage under high pressure, and once the battery pack is mounted, whether the battery pack is intact cannot be seen visually, so that the explosion-proof valve semi-permeable membrane detection is needed to be added, a special airtight tool (sealing the explosion-proof valve and the shell, enabling gas to enter and exit the battery pack through the explosion-proof valve semi-permeable membrane) is added to the explosion-proof valve of the battery pack, and whether the explosion-proof valve semi-permeable membrane is damaged or not is detected through a flow meter on the device; and a pressure sensor is added at the tail end of each module loop of the liquid cooling system for detection, the pressure difference change of each module loop is independently detected, and the leakage area of the liquid cooling system is quickly and accurately locked according to the pressure difference change condition. Meanwhile, a standard detection piece module is added, the device simultaneously carries out inflation detection on the battery pack, the liquid cooling system and the standard detection piece, and the influence of environmental factors such as external temperature, humidity and air pressure on the test precision and results is avoided.
As shown in fig. 4, the new energy vehicle battery pack tightness test device with the above structure is adopted, and the process of performing the new energy vehicle battery pack tightness test includes the following steps:
s1, connecting the tested battery pack with an air tightness detection device 3, connecting the air tightness detection device 3 with an air source 1, sealing an explosion-proof valve of the battery pack by using an explosion-proof valve air tightness tool 18, sealing an MSD high-voltage socket port 23 of the battery pack by using a socket air tightness plug 22, sealing a low-voltage communication port 25 of the battery pack by using a low-voltage communication plug air tightness plug 19, sealing a quick-charging high-voltage plug port 26 of the battery pack by using a quick-charging plug air tightness plug 20, and sealing a discharging high-voltage plug port 27 of the battery pack by using a discharging high-voltage plug air tightness plug 21 to complete the construction of the test equipment;
s2, starting the air tightness detection device 3;
s3, the battery pack sealing loop guides the gas to an explosion-proof valve of the battery pack until the airtight test of the battery pack is qualified;
and S4, the liquid cooling system sealing loop guides the gas into the liquid cooling system in the battery pack until the airtight test of the liquid cooling system is qualified.
In step S3, the battery pack sealing circuit is started, the test is completed by exhausting if the test is qualified, the test is stopped if the test is not qualified, the sealing fault is checked, the battery pack sealing circuit is restarted until the battery pack sealing circuit is qualified in the air tightness test, and the test is completed after the gas in the battery pack sealing circuit is exhausted.
In the above step S4, the liquid cooling system sealing loop is started, the test is finished by exhausting if the test is qualified, the test is stopped if the test is not qualified, the tightness fault of the liquid cooling system is checked, the liquid cooling plate with a large pressure change is checked according to the pressure detection change conditions of the first water inlet 28, the second water inlet 29, the third water inlet 30 and the fourth water inlet 31 of the battery pack, the air tightness test is performed again in sequence until the test is qualified, the gas in the liquid cooling system sealing loop is exhausted, and the test is finished.
As shown in fig. 5, the step S1 includes:
s1-1, connecting a gas source 1 with a gas source gas inlet 2 on an air tightness detection device 3 through a pipeline, so that a test device has continuous gas input, and then outputting stable gas through pressure regulation of a pressure relief valve and the like arranged in the test device;
s1-2, sealing the explosion-proof valve of the battery pack by using an explosion-proof valve airtight tool 18, sealing the MSD high-voltage socket port 23 of the battery pack by using a socket airtight plug 22, sealing the low-voltage communication port 25 of the battery pack by using a low-voltage communication plug airtight plug 19, sealing the quick-charging high-voltage plug port 26 of the battery pack by using a quick-charging plug airtight plug 20, and sealing the discharging high-voltage plug port 27 of the battery pack by using a discharging high-voltage plug airtight plug 21; the MSD high-voltage socket port 23, the low-voltage communication port 25, the quick-charging high-voltage plug-in port 26 and the discharging high-voltage plug-in port 27 are effectively sealed, so that the air tightness performance and the detection result are prevented from being influenced during air tightness detection;
s1-3, connecting an airtight detection port of a battery pack sealing loop with an explosion-proof valve airtight tool 18 by using a sixth connecting air pipe, and inputting gas into the tested battery pack at stable air pressure by the airtight detection device 3 through a semipermeable membrane on the explosion-proof valve;
s1-4, connecting a water outlet detection port of the sealed loop of the liquid cooling system with a main water outlet 32 of the battery pack to be detected by using a fifth connecting air pipe 11, and inputting gas into the liquid cooling system at stable air pressure through the main water outlet 32 by the air tightness detection device 3;
s1-5, connecting the first connecting air pipe 15 with the first water inlet 28 of the battery pack, sealing the first water inlet 28 by the fifth pressure sensor, and detecting a pressure change value delta 1 from the first water inlet 28;
s1-6, connecting the second connecting air pipe 14 with the second water inlet 29 of the battery pack, sealing the second water inlet 29 by the sixth pressure sensor, and detecting a pressure change value delta 2 from the second water inlet 29;
s1-7, connecting the third connecting air pipe 13 with the third water inlet 30 of the battery pack, and detecting a pressure change value delta 3 of the third water inlet 30 while the seventh pressure sensor seals the third water inlet 30;
s1-8, connecting the fourth connecting air pipe 12 with the fourth water inlet 31 of the battery pack, sealing the fourth water inlet 31 by the eighth pressure sensor, and detecting a pressure change value delta 4 from the fourth water inlet 31;
s1-9, completing the construction of the testing equipment.
As shown in fig. 6, the step S3 includes:
s3-1, the first ball valve 34, the second ball valve 40 and the third ball valve 43 are opened, the first electromagnetic valve 36, the second electromagnetic valve 39 and the third electromagnetic valve 42 are opened, and other valves are closed;
s3-2, gas provided by a gas source 1 enters a battery pack sealing loop, the gas is filtered, decompressed and regulated by a first pneumatic triple piece 35, and then is divided into two paths to inflate a battery pack and a first detection piece with equal pressure P1, one path of gas sequentially passes through a first electromagnetic valve 36, a second electromagnetic valve 39, a second ball valve 40, a flow meter and a sixth connecting gas pipe 17 and then enters an explosion-proof valve of the battery pack to inflate the battery pack, and the other path of gas sequentially passes through the first electromagnetic valve 36, a third electromagnetic valve 42 and a third ball valve 43 and then enters a first detection piece 44 to inflate the first detection piece 44;
s3-3, when the inflation time T1 reaches a set value, the first electromagnetic valve 36 is closed, and the first pressure sensor 38 detects a pressure value P2 after inflation is stopped;
s3-4, if P2 is not less than the set value, executing the step S3-5, otherwise, stopping the test; after the test is stopped, checking the sealing fault of the battery pack (in the step, the inflation pressure does not reach the preset value of the system, which indicates that the sealing system of the battery pack has serious leakage, so that whether the airtight blocking piece is assembled in place or not, whether the sealing gasket is installed in place or not, whether the sealing gasket is damaged or not and whether the sealing gasket is not attached flatly or not is preferably checked), and after the fault is cleared, returning to execute the step S3-2 until the P2 is more than or equal to a set value;
s3-5, stabilizing the voltage of the battery pack for a period of time, and detecting a pressure value P3 when the stabilized voltage is cut off by the first pressure sensor 38 after the stabilized voltage time T2 of the battery pack reaches a set value;
s3-6, if P3 is not less than the set value, executing the step S3-7, otherwise, stopping the test; after the test is stopped, checking the tightness fault of the battery pack (the step is that the pressure stabilizing pressure does not reach the preset value of the system, which indicates that the sealing system of the battery pack slightly leaks, if the airtight blocking piece and the sealing gasket are checked in the step S3-4, the step checks that the pressure stabilizing pressure is directly eliminated, and preferably checks whether the surface of the shell has cracks or not and whether the fastening piece is fastened in place or not), and after the fault is eliminated, returning to the step S3-2;
s3-7, when the voltage stabilization of the battery pack is finished, the second electromagnetic valve 39 and the third electromagnetic valve 42 are closed, the first differential pressure sensor 41 starts to detect a differential pressure value P4, and P4 is a differential pressure value between the battery pack and an air passage of the first detection piece 44 (the first differential pressure sensor 41, the battery pack to be detected and the first detection piece 44 are in a series connection relationship, and according to the principle of a series pipeline, the pressures at two ends of the first differential pressure sensor 41 are equal to each other and are P4, and because the test conditions of the battery pack and the first detection piece 44 are the same, the influences of factors such as temperature, humidity, air pressure and the like can be eliminated);
s3-8, if P4 is not more than the set value and the detection time T4 reaches the set value, executing the step S3-9, otherwise, stopping the test; after the test is stopped, checking the sealing fault of the battery pack (in the step, the pressure of the detected leakage amount exceeds a preset threshold value of the system, which indicates that the sealing system of the battery pack has slight leakage, if the airtight blocking piece, the sealing gasket, the surface of the shell and the standard fastener are checked in the steps S3-4 and S3-6, the checking in the step is directly carried out, whether the flange surface of the shell of the lower shell is deformed or not and whether the welding seam of the inner and outer cross beams is burnt through or not is preferentially checked), and after the fault is cleared, returning to execute the step S3-2;
s3-9, a second electromagnetic valve 39, a third electromagnetic valve 42 and a fourth electromagnetic valve 37 are opened, gas in a first detection piece 44 sequentially passes through a third ball valve 43, the third electromagnetic valve 42, the fourth electromagnetic valve 37 and an exhaust silencer 46 and then is discharged to the external environment, gas in a battery pack sequentially passes through a semipermeable membrane of an explosion-proof valve 24, an explosion-proof valve air-tight tool 18 (an outer envelope structure of a sealed explosion-proof valve, and the gas can enter and exit the battery pack through a base membrane), a sixth connecting pipeline 17, a flow meter 45, the fourth electromagnetic valve 37 and the exhaust silencer 46 and then is discharged to the external environment, and the flow rate of the gas in the battery pack when passing through the flow meter 45 under the pressure of P4 is L1;
s3-10, if L1 is not more than the set value, executing the step S3-11, otherwise, stopping the test; after the test is stopped, the sealing fault of the explosion-proof valve is checked, and after the explosion-proof valve is replaced, the step S3-2 is executed again;
and S3-11, the air tightness test of the battery pack is qualified, and the air tightness test of the battery pack is finished.
As shown in fig. 6, the step S4 includes:
s4-1, the fourth ball valve 48 and the fifth ball valve 57 are opened, the air outlet of the fifth electromagnetic valve 50, the sixth electromagnetic valve 53 and the seventh electromagnetic valve 54 which are connected with the total air outlet of the battery pack and the eighth electromagnetic valve 56 are opened, and other valves are closed;
s4-2, allowing gas provided by a gas source 1 to enter a liquid cooling system sealing loop, after pressure relief and pressure regulation of a second pneumatic triple piece, allowing the gas to enter a liquid cooling system 70 and a second detection piece 58 for isobaric P1' inflation in two ways, allowing one way of the gas to enter the liquid cooling system 70 after sequentially passing through a fifth electromagnetic valve 50, a sixth electromagnetic valve 53, a seventh electromagnetic valve 54, a second ball valve 40 and a total water outlet 32 of a battery pack, inflating the liquid cooling system 70, allowing the other way of the gas to enter the second detection piece 58 after sequentially passing through the fifth electromagnetic valve 50, an eighth electromagnetic valve 56 and a fifth ball valve 57, and inflating the second detection piece 58;
s4-3, when the inflation time T1 'reaches a set value, the fifth electromagnetic valve 50 is closed, and the second pressure sensor 52 detects the pressure P2' after inflation is stopped;
s4-4, if P2' is not less than the set value, executing the step S4-5, otherwise, stopping the test; after the test is stopped, checking the serious sealing fault of the liquid cooling system (in the step, the inflation pressure does not reach the preset value of the system, which indicates that the sealing system of the liquid cooling system has serious leakage, so that whether the pipeline joint is assembled in place or not is preferentially checked, whether the pipeline sealing gasket is installed in place or not is damaged or not, according to the pressure difference change values delta 1, delta 2, delta 3 and delta 4 recorded instantly after the inflation of the pressure sensors 59, 60, 61 and 62 recorded by a host, the detection pressure of the 4 water inlet sensors of the battery pack is P2' when the inflation is finished, the leakage quantity can aggravate the pressure difference change, so that the pressure difference values delta 1, delta 2, delta 3 and delta 4 are compared, and the test can be sequentially checked from large to small), and after the fault is removed, returning to the step S4-2 and restarting the detection;
s4-5, stabilizing the pressure of the liquid cooling system for a period of time, and detecting the pressure value P3 'when the pressure is stabilized and cut off by the second pressure sensor 52 after the pressure stabilizing time T2' of the liquid cooling system reaches a set value;
s4-6, if P3' is not less than the set value, executing the step S4-7, otherwise, stopping the test; after the test is stopped, checking the sealing fault of the liquid cooling system (if the pressure stabilizing pressure does not reach the preset value of the system, the step indicates that the sealing system of the liquid cooling system slightly leaks, if the step S4-4 is not enough, the pipeline joint and the pipeline sealing gasket are checked, the step checks that the pressure stabilizing pressure is directly checked, whether the airtight sealing piece leaks or not is checked preferentially, according to pressure difference change values delta 1, delta 2, delta 3 and delta 4 recorded immediately after the inflation of the pressure sensors 59, 60, 61 and 62 recorded by a host computer is finished, according to the fact that the detection pressure of 4 water inlet sensors is P3' when the inflation is finished, the leakage amount can aggravate the pressure difference change when the inflation is finished, so that the pressure difference values delta 1, delta 2, delta 3 and delta 4 are compared, the test can be checked from large to small in sequence), and after the fault is cleared, returning to execute the step S4-2;
s4-7, when the liquid cooling system finishes voltage stabilization, the sixth electromagnetic valve 53 and the eighth electromagnetic valve 56 are closed, the second differential pressure sensor 55 starts to detect a differential pressure value P4 ', and P4 ' is a differential pressure value between the liquid cooling system 70 and the air path of the second detection piece 58 (the second differential pressure sensor 55, the liquid cooling system 70 and the second detection piece 58 are in series connection, and according to the principle of a series pipeline, the pressures at two ends of the differential pressure sensor are equal to each other and are P4 ' when the voltage stabilization is finished, and the liquid cooling system and the detection piece have the same test conditions and tools, so the shell eliminates the influences of factors such as temperature, humidity, air pressure and the like);
s4-8, if the P4 'is less than or equal to the set value and the detection time T4' reaches the set value, executing the step S4-9, otherwise, stopping the test; after the test is stopped, checking the sealing fault of the liquid cooling system (in the step, the pressure of the detected leakage amount exceeds a preset threshold value of the system, which indicates that the liquid cooling sealing system slightly leaks, if the pipeline joint, the sealing gasket and the airtight blocking piece are checked in the steps S4-4 and S4-6, the checking in the step is directly performed, the bent part of the pipeline and the corrugated pipe part of the pipeline are preferably checked, the pressure difference change values delta 1, delta 2, delta 3 and delta 4 recorded instantly after the inflation of the pressure sensors 59, 60, 61 and 62 recorded by a host are finished, and the pressure detected by 4 water inlet sensors is P4' when the inflation is finished, the leakage amount is changed along with the aggravation of the pressure difference, so the pressure difference values delta 1, delta 2, delta 3 and delta 4 are compared, the checking test can be performed in sequence from large to small), and after the fault is removed, the step S4-2 is returned to be executed;
s4-9, the eighth solenoid valve 51, the sixth solenoid valve 53 and the seventh solenoid valve 54 are opened, the gas outlet connected with the exhaust muffler 46 and the eighth solenoid valve 56 are opened, the gas in the second detection piece 58 sequentially passes through the fifth ball valve 57, the eighth solenoid valve 56, the eighth solenoid valve 51 and the exhaust muffler 46 and is discharged into the external environment, and the gas in the liquid cooling system sequentially passes through the total water outlet 32 of the battery pack, the seventh solenoid valve 54 and the exhaust muffler 46 and is discharged into the external environment;
s4-10, the liquid cooling pipeline is airtight and qualified, and the liquid cooling loop tightness test is finished;
and S4-11, the battery pack and the liquid cooling system are sealed and airtight to be tested to be qualified, and the test is finished.
The invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited by the above-described manner. Various insubstantial improvements are made by adopting the method conception and the technical proposal of the utility model; or without improvement, the above conception and technical solution of the present invention can be directly applied to other occasions, all within the protection scope of the present invention.
Claims (7)
1. The device for testing the sealing performance of the new energy automobile battery pack is characterized by comprising an air tightness detection device, an explosion-proof valve air tightness tool used for sealing an explosion-proof valve on the battery pack, a socket air tightness plug used for sealing an MSD high-voltage socket port of the battery pack, a low-voltage communication plug air tightness plug used for sealing a low-voltage communication port of the battery pack, a quick-charging plug air tightness plug used for sealing a quick-charging high-voltage plug port of the battery pack and a discharging high-voltage plug air tightness plug used for sealing a discharging high-voltage plug port of the battery pack, wherein the air tightness detection device is provided with a battery pack sealing loop used for being connected with the explosion-proof valve air tightness tool, a liquid cooling system sealing loop used for being connected with a main water outlet of the battery pack and an air source air inlet used for being connected with an air source, and the air source air inlet is connected.
2. The new energy automobile battery pack tightness testing device according to claim 1, wherein the battery pack sealing loop comprises a first ball valve, a first pneumatic triple piece, a first electromagnetic valve, a second ball valve, a flowmeter, a third electromagnetic valve connected with the first electromagnetic valve, a third ball valve connected with the third electromagnetic valve, and a first detection piece connected with the third ball valve, which are sequentially connected, and the flowmeter is connected with the explosion-proof valve tightness tool.
3. The new energy automobile battery pack tightness testing device according to claim 2, wherein the battery pack sealing loop further comprises a fourth solenoid valve connected with the first solenoid valve and an exhaust silencer connected with the fourth solenoid valve.
4. The new energy automobile battery pack tightness testing device according to claim 2 or 3, wherein the battery pack sealing loop further comprises a first pressure sensor for detecting a pressure value at a pipeline connecting the first solenoid valve and the second solenoid valve and a first differential pressure sensor for detecting a differential pressure value, one end of the first differential pressure sensor is connected with the pipeline connecting the second solenoid valve and the second ball valve, and the other end of the first differential pressure sensor is connected with the pipeline connecting the third solenoid valve and the third ball valve.
5. The new energy automobile battery pack tightness testing device according to claim 1, wherein the liquid cooling system sealing loop comprises a fourth ball valve, a second pneumatic triple piece, a fifth electromagnetic valve, a sixth electromagnetic valve, a seventh electromagnetic valve, an eighth electromagnetic valve connected with the fifth electromagnetic valve, a fifth ball valve connected with the eighth electromagnetic valve, and a second detection piece connected with the fifth ball valve, which are connected in sequence, and the seventh electromagnetic valve is connected with a total water outlet of the battery pack.
6. The new energy automobile battery pack tightness testing device according to claim 5, wherein the liquid cooling system sealing loop further comprises a ninth solenoid valve connected with the fifth solenoid valve, and the eighth solenoid valve and the seventh solenoid valve are connected with an exhaust muffler.
7. The new energy automobile battery pack tightness testing device according to claim 5 or 6, wherein the liquid cooling system sealing loop further comprises a second pressure sensor for detecting a pressure value at a pipeline connecting the fifth solenoid valve and the sixth solenoid valve, and a second differential pressure sensor for detecting a differential pressure value, one end of the second differential pressure sensor is connected with a pipeline connecting the sixth solenoid valve and the seventh solenoid valve, and the other end of the second differential pressure sensor is connected with a pipeline connecting the eighth solenoid valve and the fifth ball valve.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112611523A (en) * | 2020-12-22 | 2021-04-06 | 芜湖奇达动力电池***有限公司 | New energy automobile battery pack sealing performance testing method |
| CN113607354A (en) * | 2021-08-26 | 2021-11-05 | 蜂巢能源科技有限公司 | Battery pack air tightness detection method and detection system |
| CN114019274A (en) * | 2021-10-26 | 2022-02-08 | 深圳市道通合创新能源有限公司 | Detection tool and method for high-voltage component and detection system for new energy automobile |
| CN114062266A (en) * | 2021-11-13 | 2022-02-18 | 深圳安博检测股份有限公司 | New energy automobile battery pack damage detection device and method |
| CN116315518A (en) * | 2023-05-18 | 2023-06-23 | 山东电工时代能源科技有限公司 | Liquid supplementing device and method of liquid cooling unit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112611523A (en) * | 2020-12-22 | 2021-04-06 | 芜湖奇达动力电池***有限公司 | New energy automobile battery pack sealing performance testing method |
| CN112611523B (en) * | 2020-12-22 | 2024-06-11 | 芜湖奇达动力电池***有限公司 | New energy automobile battery pack tightness test method |
| CN113607354A (en) * | 2021-08-26 | 2021-11-05 | 蜂巢能源科技有限公司 | Battery pack air tightness detection method and detection system |
| CN114019274A (en) * | 2021-10-26 | 2022-02-08 | 深圳市道通合创新能源有限公司 | Detection tool and method for high-voltage component and detection system for new energy automobile |
| CN114062266A (en) * | 2021-11-13 | 2022-02-18 | 深圳安博检测股份有限公司 | New energy automobile battery pack damage detection device and method |
| CN116315518A (en) * | 2023-05-18 | 2023-06-23 | 山东电工时代能源科技有限公司 | Liquid supplementing device and method of liquid cooling unit |
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