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CN-122017625-A - Lithium ion battery thermal runaway testing device based on array temperature sensor

CN122017625ACN 122017625 ACN122017625 ACN 122017625ACN-122017625-A

Abstract

The invention discloses a lithium ion battery thermal runaway testing device based on an array temperature sensor, which is applied to the field of lithium battery performance testing, and comprises a device body, wherein the array temperature sensing assembly and a temperature auxiliary monitoring system are arranged, so that the temperature distribution condition in a testing cavity can be accurately mastered in real time when the lithium ion battery thermal runaway testing is carried out, the heat energy generated by a battery and the external heat energy applied in the testing process can be distinguished, the measuring error caused by the self-heating of the battery can be effectively reduced, the temperature control precision and the data tracking accuracy in the testing process are obviously improved, the reliability and the repeatability of testing data are enhanced, the monitoring efficiency of the thermal runaway state of the lithium ion battery can be greatly improved, the origin position of the battery thermal failure can be effectively assisted by the device body, the data analysis difficulty is reduced, and the accuracy of the thermal runaway testing implemented by the device body and the reliability of testing data are comprehensively improved.

Inventors

  • GUO YIFEI
  • CHEN LI
  • TANG QIGUANG

Assignees

  • 铭感科技(绍兴)有限公司

Dates

Publication Date
20260512
Application Date
20260210

Claims (8)

  1. 1. The lithium ion battery thermal runaway testing device based on the array temperature sensor comprises a device body (1), wherein a control panel (12), a testing cavity (11) and a temperature control cavity (13) are respectively arranged on the device body (1) from top to bottom, a protection cage (2) is arranged in the testing cavity (11), the device is characterized in that a plurality of array temperature sensing assemblies (3) are uniformly arranged on the protection cage (2), each array temperature sensing assembly (3) comprises a heat insulation shell (31) embedded on the protection cage (2), heat conducting fins (32) are fixedly connected to the inner end and the outer end of each heat insulation shell (31), a plurality of heat driving pieces (33) are fixedly connected to the adjacent ends of the heat conducting fins (32), isolation sliding blocks (35) are slidably arranged in the heat insulation shells (31), the adjacent ends of the heat driving pieces (31) at the inner side and the outer side are respectively extended into the heat insulation shells (31), the heat driving pieces are matched with the isolation sliding blocks (35), a pair of balance sensing pieces (36) are respectively arranged on the upper inner wall and the lower inner wall of the heat insulation shells (31), and the balance sensing pieces (36) are respectively arranged between the two balance pieces (36); The temperature-sensing control device is characterized in that a temperature-assisted monitoring system is mounted in the control panel (12), the temperature-assisted monitoring system comprises a temperature-assisted processing unit, the input end of the temperature-assisted processing unit is connected with a temperature-sensing balance acquisition unit and a temperature data acquisition unit, the output end of the temperature-assisted processing unit is connected with a temperature-sensing feedback unit, the input end of the temperature-sensing balance acquisition unit is in signal connection with a balance sensing piece (36), the input end of the temperature data acquisition unit is in signal connection with an infrared sensing probe arranged on the upper inner wall of the test cavity (11), and the output end of the temperature-sensing feedback unit is in signal connection with the temperature control cavity (13).
  2. 2. The lithium ion battery thermal runaway testing device based on the array temperature sensor of claim 1, wherein one end, far away from the heat conducting fin (32), of each of the plurality of heat driving pieces (33) located on the same side is fixedly connected with a synchronizing piece (34), and one end, far away from the heat driving pieces (33), of each synchronizing piece (34) is fixedly connected with an isolation sliding block (35).
  3. 3. The lithium ion battery thermal runaway testing device based on the array temperature sensor according to claim 2, wherein the thermal driving piece (33) comprises a corrugated guide tube (331) fixedly arranged between the heat insulation shell (31) and the synchronizing piece (34), an elastic sleeve (332) is fixedly connected in the corrugated guide tube (331), and the elastic sleeve (332) is filled with thermosensitive gas (333).
  4. 4. The lithium ion battery thermal runaway testing device based on the array temperature sensor of claim 2, wherein the balance sensing piece (36) comprises a linkage block (362) fixedly arranged at the upper end and the lower end of the synchronizing piece (34), the linkage block (362) is fixedly connected with the isolation slider (35), one end of the linkage block (362) away from the isolation slider (35) is fixedly connected with a spacer sleeve (363), one end of the spacer sleeve (363) away from the isolation slider (35) is fixedly connected with a limiting block (361), the limiting block (361) is fixedly connected with the inner wall of the heat insulation shell (31), the inner wall of one side of the spacer sleeve (363) away from the isolation slider (35) and the inner wall of one side close to the isolation slider (35) are fixedly connected with a sensing strip (364), and the input end of the temperature sensing balance acquisition unit is in signal connection with the sensing strip (364).
  5. 5. The lithium ion battery thermal runaway testing device based on the array temperature sensor of claim 4, wherein the temperature sensing balance acquisition unit comprises an inner end sensing acquisition module, an outer end sensing acquisition module and a sensing positioning identification module, the input end of the inner end sensing acquisition module is in signal connection with a sensing strip (364) positioned on the inner side of the isolation sliding block (35), the input end of the outer end sensing acquisition module is in signal connection with a sensing strip (364) positioned on the outer side of the isolation sliding block (35), and the input end of the sensing positioning identification module is in signal connection with a positioner embedded in the isolation sliding block (35).
  6. 6. The lithium ion battery thermal runaway testing device based on the array temperature sensor of claim 1, wherein a graphite elastic hinge frame (51) is fixedly connected to the inner end of the heat conducting fin (32) located on the inner side, an extension guide fin (5) is fixedly connected to the inner end of the graphite elastic hinge frame (51), a plurality of transfer chucks (42) arranged on the outer side of the graphite elastic hinge frame (51) are fixedly connected to one end, close to the heat conducting fin (32), of the transfer chucks (42), a spacing adjusting screw (4) is rotatably connected to one end, close to the heat conducting fin (32), of the spacing adjusting screw (4) penetrates through the heat conducting fin (32) and extends into the heat insulation shell (31), a plurality of threaded sleeves (41) corresponding to the spacing adjusting screw (4) are fixedly connected to the inner wall, close to one end, of the heat conducting fin (32), of the inner side, of the heat conducting fin (32), of the thread sleeves (41) are sleeved on the outer side of the spacing adjusting screw (4).
  7. 7. The lithium ion battery thermal runaway testing device based on the array temperature sensor of claim 6, wherein the graphite elastic hinge frame (51) is formed by hinging a plurality of graphite strips, and the extending guide piece (5) can be driven to generate corresponding displacement through the change of hinging angles among the plurality of graphite strips.
  8. 8. The lithium ion battery thermal runaway testing device based on the array temperature sensor of claim 1, wherein the input end of the temperature auxiliary processing unit is further connected with a parameter setting unit, the input end of the parameter setting unit is in signal connection with the control panel (12), the output end of the temperature auxiliary processing unit is further connected with a temperature sensing display unit and an abnormality warning unit, the output end of the temperature sensing display unit is in signal connection with the control panel (12), and the output end of the abnormality warning unit is in signal connection with an alarm arranged on the control panel (12).

Description

Lithium ion battery thermal runaway testing device based on array temperature sensor Technical Field The invention relates to the field of performance test of lithium batteries, in particular to a lithium ion battery thermal runaway test device based on an array temperature sensor. Background The lithium ion battery thermal runaway test is used as a core means for evaluating the safety and stability of the lithium ion battery, and is mainly used for simulating dangerous reactions (such as fires and explosions) possibly caused under extreme working conditions so as to accurately identify potential risks. To achieve the aim, modern test devices are commonly provided with multiple sensor arrays, wherein the application of the array temperature sensor is particularly critical, the accuracy and the efficiency of the test are remarkably improved, and data support is provided for the formulation of a safety protection strategy, the rapid diagnosis of faults and the iterative optimization of performance. The prior art discloses CN117805632A lithium ion power battery thermal runaway safety testing device, can utilize the extrusion piston to slide in the inside of test box through setting up the test fire extinguishing mechanism, pressurizes the delivery port department with the rivers of test box bottom through water inlet and fire extinguishing water pipe and discharges to realize lithium ion power battery's fire extinguishing function. The CN113311339A is also used for effectively detecting dynamic parameters of gas flow in the thermal runaway and thermal spread gas eruption process of the lithium ion battery monomer or the battery module, and has the advantages of convenient operation and high test efficiency. In the actual testing process, when the lithium ion battery is overheated abnormally, the lithium ion battery can continuously release a large amount of heat energy, so that the follow-up temperature control system is difficult to realize high-efficiency and accurate temperature regulation and data tracking, and finally the reliability of test data is influenced. Therefore, the application provides a lithium ion battery thermal runaway testing device based on an array temperature sensor, which can monitor and distinguish the contribution value of self-heating data of a feedback battery and an external heating source in real time, effectively reduce temperature control errors and monitoring deviation, and remarkably improve the reliability and repeatability of testing data. Disclosure of Invention The invention aims at solving the problems that the subsequent temperature control system is difficult to realize high-efficiency and accurate temperature regulation and data tracking and finally influences the reliability of test data due to the heat energy continuously released by the lithium ion battery in the prior art by arranging the array temperature sensing assembly and the temperature auxiliary monitoring system, and simultaneously, the invention can adapt and feed back the temperature aiming at different types of lithium ion batteries and expand the application range of the test device. In order to solve the problems, the invention adopts the following technical scheme. The lithium ion battery thermal runaway testing device based on the array temperature sensor comprises a device body, wherein a control panel, a testing cavity and a temperature control cavity are respectively arranged on the device body from top to bottom, a protection cage is arranged in the testing cavity, a plurality of array temperature sensing assemblies are uniformly arranged on the protection cage, each array temperature sensing assembly comprises a heat insulation shell which is embedded on the protection cage, heat conducting fins are fixedly connected to the inner end and the outer end of each heat insulation shell, a plurality of heat driving pieces are fixedly connected to the two heat conducting fins at the end close to each other, an isolation sliding block is arranged in the heat insulation shell in a sliding manner, the heat driving pieces at the inner side and the outer side are respectively extended into the heat insulation shell at the end close to each other and are matched with the isolation sliding block, a pair of balance sensing pieces are respectively arranged on the upper inner wall and the lower inner wall of each heat insulation shell, and the isolation sliding block is positioned between the two balance sensing pieces; The temperature auxiliary monitoring system is mounted in the control panel and comprises a temperature auxiliary processing unit, the input end of the temperature auxiliary processing unit is connected with a temperature sensing balance acquisition unit and a temperature data acquisition unit, the output end of the temperature auxiliary processing unit is connected with a temperature sensing feedback unit, the input end of the temperature sensing balance acquisition unit is connected with a bal