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CN-224202503-U - Measuring device for gas production of battery cell

CN224202503UCN 224202503 UCN224202503 UCN 224202503UCN-224202503-U

Abstract

The application relates to the technical field of batteries, and provides a measuring device for gas production of an electric core. The measuring device for the gas production of the battery comprises a gas guide pipe, a first flowmeter, a second flowmeter and a gas source, wherein the gas guide pipe comprises a first pipe body and a second pipe body, the first pipe body comprises a gas inlet section, a middle section and a gas outlet section which are sequentially arranged, the pipe diameters of the gas inlet section and the gas outlet section are equal, one end of the second pipe body is communicated with the middle section, the other end of the second pipe body is used for being connected with the inside of a core, the first flowmeter is arranged in the gas inlet section to measure the gas flow in the gas inlet section, the second flowmeter is arranged in the gas outlet section to measure the gas flow in the gas outlet section, and the gas source is communicated with the gas inlet section and outputs gas with constant flow. The gas production rate and the gas production rate of the battery cell can be obtained in real time after the measurement data of the first flowmeter and the second flowmeter are calculated, and the gas production condition of the battery cell can be monitored and detected for a long period, so that the accuracy of the data obtained by the measurement device is improved.

Inventors

  • LV LEI
  • WANG CONG
  • YAN LONG

Assignees

  • 浙江极氪智能科技有限公司
  • 威睿电动汽车技术(宁波)有限公司
  • 浙江吉利控股集团有限公司

Dates

Publication Date
20260505
Application Date
20250513

Claims (10)

  1. 1. A measurement device for gas production of a cell, comprising: The air duct comprises a first duct body (1) and a second duct body (2), wherein the first duct body (1) comprises an air inlet section (11), a middle section (12) and an air outlet section (13) which are sequentially arranged, the pipe diameters of the air inlet section (11) and the air outlet section (13) are equal, one end of the second duct body (2) is communicated with the middle section (12), and the other end of the second duct body is used for being connected with the inside of an electric core (6); A first flowmeter (3) provided in the intake section (11) to measure the flow rate of gas in the intake section (11); A second flowmeter (4) provided in the gas outlet section (13) to measure the gas flow rate in the gas outlet section (13); and the air source (5) is communicated with the air inlet section (11) and outputs a constant flow rate of air.
  2. 2. The cell gas production measurement device according to claim 1, wherein the diameter of the intermediate section (12) is smaller than the diameters of the gas inlet section (11) and the gas outlet section (13), and the wall between the intermediate section (12) and the gas inlet section (11) is smoothly transited, and the wall between the intermediate section (12) and the gas outlet section (13) is smoothly transited.
  3. 3. The cell gas production measurement device according to claim 1, characterized in that the gas inlet section (11) is provided with a control valve arranged upstream of the first flow meter (3), which control valve is capable of controlling the flow of gas into the intermediate section (12).
  4. 4. The cell gas production measurement device according to claim 1, wherein a barometer (22) is provided on the second tube body (2) so that the barometer (22) measures the gas pressure in the second tube body (2).
  5. 5. The cell gas production measurement device according to claim 1, wherein a sealing ring (21) is sleeved at one end of the second tube body (2) far away from the first tube body (1), the second tube body (2) is used for being inserted into a liquid injection port (61) of the cell (6), and the sealing ring (21) is used for sealing a gap between the second tube body (2) and the liquid injection port (61).
  6. 6. The cell gas production measurement device according to claim 1, further comprising two pressing plates (71) and a connecting piece (72), wherein the two pressing plates (71) are used for clamping and fixing the cell (6), and the two pressing plates (71) are connected through the connecting piece (72).
  7. 7. The cell gas production measurement device according to claim 1, wherein a dryer (14) is connected to a port of the gas inlet section (11) remote from the intermediate section (12), and the gas source (5) is communicated with the gas inlet section (11) through the dryer (14).
  8. 8. The cell gas production measurement device according to claim 1, wherein a gas analyzer is connected to the gas outlet section (13) to analyze the composition of the gas discharged from the gas outlet section (13).
  9. 9. The cell gassing measurement device according to claim 1 wherein the diameter of the second tube body (2) is less than or equal to the length of the intermediate section (12).
  10. 10. The cell gas production measurement device according to claim 1, further comprising an analysis module electrically connected to the first and second flow meters (3, 4) configured to collect measurement data and measurement time periods of the first and second flow meters (3, 4) and calculate the gas production and/or gas production rate of the cell (6) from the difference between the measurement data of the second and first flow meters (4, 3) and the measurement time periods.

Description

Measuring device for gas production of battery cell Technical Field The application relates to the technical field of batteries, in particular to a measuring device for gas production of an electric core. Background In the production process and the use process of the battery, the gas production characteristic of the battery cell is a key index parameter for representing the electrochemical reaction process and failure mechanism inside the battery cell. In the current commonly adopted offline gas collection detection method, gas separated out in the current core circulation process is collected through an external closed gas collection device, and the average gas production rate is calculated based on the ratio of the accumulated gas volume to the test time. However, the gas collecting device in the detection mode has limited capacity, when the gas yield of the battery cell reaches the capacity threshold of the gas collecting device, the test must be interrupted to perform manual gas discharge operation or replace a gas cylinder, the continuity of detection is destroyed, and the gas collecting device can perform gas volume calculation only after the collection period is finished, so that the conventional detection mode cannot acquire the gas yield and the gas yield rate of the battery cell in real time, long-period detection in the gas production process of the battery cell is difficult to realize, the acquired data is difficult to accurately react with the reaction and failure principles in the battery cell, and the research on the electrochemical reaction process and failure mechanism in the battery cell is influenced. Disclosure of utility model In order to solve the above technical problems or at least partially solve the above technical problems, the present application provides a measurement device for gas production of a battery cell. The application provides a measuring device for gas production of an electric core, which comprises: The air duct comprises a first duct body and a second duct body, wherein the first duct body comprises an air inlet section, a middle section and an air outlet section which are sequentially arranged, the pipe diameters of the air inlet section and the air outlet section are equal, one end of the second duct body is communicated with the middle section, and the other end of the second duct body is used for being connected with the inside of an electric core; a first flowmeter arranged in the air inlet section for measuring the air flow in the air inlet section; the second flowmeter is arranged on the air outlet section to measure the air flow in the air outlet section; and the air source is communicated with the air inlet section and outputs a constant flow rate of air. Optionally, the diameter of the middle section is smaller than the diameters of the air inlet section and the air outlet section, the pipe wall between the middle section and the air inlet section is in smooth transition, and the pipe wall between the middle section and the air outlet section is in smooth transition. Optionally, the air inlet section is provided with a control valve, the control valve is arranged at the upstream of the first flowmeter, and the control valve can control the flow rate of the gas flowing into the middle section. Optionally, a barometer is disposed on the second pipe body, so that the barometer measures the air pressure in the second pipe body. Optionally, one end of the second pipe body, which is far away from the first pipe body, is sleeved with a sealing ring, the second pipe body is used for being inserted into the liquid injection port of the battery cell, and the sealing ring is used for sealing a gap between the second pipe body and the liquid injection port. Optionally, the measuring device for the gas production of the electric core further comprises two pressing plates and a connecting piece, wherein the two pressing plates are used for clamping and fixing the electric core, and the two pressing plates are connected through the connecting piece. Optionally, a port of the air inlet section far away from the middle section is connected with a dryer, and the air source is communicated with the air inlet section through the dryer. Optionally, a gas analyzer is connected to the gas outlet section to analyze the composition of the gas discharged from the gas outlet section. Optionally, the diameter of the second tube body is less than or equal to the length of the intermediate section. Optionally, the measurement device for gas production of the electric core further comprises an analysis module, wherein the analysis module is electrically connected with the first flowmeter and the second flowmeter and is configured to collect measurement data and measurement duration of the first flowmeter and the second flowmeter, and calculate the gas production rate and/or the gas production rate of the electric core according to the difference between the measurement data of the seco