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CN-122016172-A - Lithium battery testing method, equipment and storage medium

CN122016172ACN 122016172 ACN122016172 ACN 122016172ACN-122016172-A

Abstract

The embodiment of the invention discloses a testing method, equipment and a storage medium of a lithium battery, wherein the testing method comprises the steps of placing a target lithium battery into a sealed testing cabin; establishing an internal and external pressure difference environment of the target lithium battery, wherein the internal air pressure of the target lithium battery is lower than the external air pressure, maintaining the internal and external pressure difference environment, injecting liquid into the sealed test cabin, monitoring the state of the target lithium battery in the liquid injection process, and determining the tightness of the target lithium battery based on the monitoring result. According to the embodiment of the invention, the internal and external pressure differential environment of the lithium battery is established, and the wading test is carried out under the environment, so that the technical problems of single test environment and limited test precision in the sealing test of the lithium battery in the prior art are solved, and the technical effects of improving the authenticity and diversity of the test environment and improving the test precision are realized.

Inventors

  • ZHANG QIANG

Assignees

  • 惠州亿纬锂能股份有限公司

Dates

Publication Date
20260512
Application Date
20260212

Claims (11)

  1. 1. A method for testing a lithium battery, the method comprising: placing the target lithium battery into a sealed test cabin; establishing an internal and external pressure difference environment of the target lithium battery, wherein the internal air pressure of the target lithium battery is lower than the external air pressure; Maintaining the internal and external pressure differential environment, and injecting liquid into the sealed test cabin; Monitoring the state of the target lithium battery in the process of injecting liquid; and determining the tightness of the target lithium battery based on the monitoring result.
  2. 2. The method of claim 1, wherein establishing an internal-external pressure differential environment of the target lithium battery, and wherein the internal air pressure of the target lithium battery is lower than the external air pressure, comprises: And vacuumizing the sealed test cabin, establishing an internal and external pressure difference environment of the target lithium battery, wherein the internal air pressure of the target lithium battery is lower than the external air pressure.
  3. 3. The method of claim 1, wherein establishing an internal-external pressure differential environment of the target lithium battery, and wherein the internal air pressure of the target lithium battery is lower than the external air pressure, comprises: And vacuumizing the sealed test cabin and the interior of the target lithium battery, and establishing an internal-external pressure difference environment of the target lithium battery, wherein the internal air pressure of the target lithium battery is lower than the external air pressure.
  4. 4. A method of testing a lithium battery according to any one of claims 1-3, wherein injecting a liquid into the sealed test compartment comprises: Injecting a liquid into the sealed test chamber based on at least one of the following dynamic scenarios: the liquid level rises from the bottom of the target lithium battery to fully submerge the target lithium battery at a set speed; the liquid level is kept at the set height of the target lithium battery, and periodic fluctuation is applied; And carrying out local spraying or flushing on the set position of the target lithium battery.
  5. 5. The method of testing a lithium battery according to claim 1, wherein determining the tightness of the target lithium battery based on the monitoring result comprises: And if the monitoring result is one of the following states, determining that the sealing of the target lithium battery fails: The insulation resistance of the target lithium battery is reduced to be below a safety threshold value at a set speed; the difference between the internal air pressure and the external air pressure of the target lithium battery changes at a set rate; The target lithium battery has continuous bubbles.
  6. 6. The method of testing a lithium battery of claim 5, wherein after determining that the seal of the target lithium battery fails, the method further comprises: the leak point of the target lithium battery is located based on the level height at the time of seal failure or the observed bubble source.
  7. 7. The method of testing a lithium battery of claim 5, wherein after determining that the seal of the target lithium battery fails, the method further comprises: estimating a leakage rate of the target lithium battery based on a rate of change of a difference between an internal air pressure and an external air pressure of the target lithium battery in combination with an internal cavity volume of the target lithium battery; and determining a seal level of the target lithium battery based on the leak rate.
  8. 8. The method of claim 1, wherein monitoring the state of the target lithium battery during the injection of the liquid comprises: and monitoring performance parameters of the target lithium battery in the process of injecting liquid and whether a bubble source exists, wherein the performance parameters at least comprise pressure parameters, electrical safety parameters, secondary diagnosis parameters and physical parameters.
  9. 9. The method for testing a lithium battery according to claim 1, wherein after completing the sealability test of the target lithium battery, the method further comprises: And disassembling the target lithium battery, checking whether water trace and corrosion exist in the target lithium battery, and verifying the accuracy of the tightness test.
  10. 10. A test apparatus for a lithium battery, the apparatus comprising: at least one processor, and A memory communicatively coupled to the at least one processor, wherein, The memory stores a computer program executable by the at least one processor to enable the at least one processor to perform the method of testing a lithium battery of any one of claims 1-9.
  11. 11. A computer readable storage medium, characterized in that it stores computer instructions for causing a processor to implement the method for testing a lithium battery according to any one of claims 1-9 when executed.

Description

Lithium battery testing method, equipment and storage medium Technical Field The embodiment of the invention relates to the technical field of testing, in particular to a method, equipment and storage medium for testing a lithium battery. Background With the wide application of lithium batteries in the fields of electric automobiles, energy storage systems and the like, the safety and reliability of the lithium batteries are focused. If leakage or poor sealing occurs in the use process of the lithium battery, potential safety hazards such as internal electrolyte leakage, short circuit, even fire explosion and the like can be caused. Therefore, it is important to effectively detect the sealability of the lithium battery. In the prior art, a pressure test or an air tightness test is generally used to evaluate the sealing performance of a lithium battery. However, the methods often have the problems of single testing environment, incapability of simulating actual use working conditions, limited testing precision and the like. For example, the conventional pressure test judges sealability only by applying a constant pressure, and it is difficult to comprehensively reflect the sealing state of the lithium battery in a complex environment. Disclosure of Invention The embodiment of the invention provides a method, equipment and storage medium for testing a lithium battery, which solve the technical problems of single testing environment and limited testing precision in the prior art for testing the tightness of the lithium battery. The embodiment of the invention provides a testing method of a lithium battery, which comprises the following steps: placing the target lithium battery into a sealed test cabin; establishing an internal and external pressure difference environment of the target lithium battery, wherein the internal air pressure of the target lithium battery is lower than the external air pressure; Maintaining the internal and external pressure differential environment, and injecting liquid into the sealed test cabin; Monitoring the state of the target lithium battery in the process of injecting liquid; and determining the tightness of the target lithium battery based on the monitoring result. Further, establishing an internal-external pressure differential environment of the target lithium battery, and the internal air pressure of the target lithium battery being lower than the external air pressure comprises: And vacuumizing the sealed test cabin, establishing an internal and external pressure difference environment of the target lithium battery, wherein the internal air pressure of the target lithium battery is lower than the external air pressure. Further, establishing an internal-external pressure differential environment of the target lithium battery, and the internal air pressure of the target lithium battery being lower than the external air pressure comprises: And vacuumizing the sealed test cabin and the interior of the target lithium battery, and establishing an internal-external pressure difference environment of the target lithium battery, wherein the internal air pressure of the target lithium battery is lower than the external air pressure. Further, injecting a liquid into the sealed test chamber includes: Injecting a liquid into the sealed test chamber based on at least one of the following dynamic scenarios: the liquid level rises from the bottom of the target lithium battery to fully submerge the target lithium battery at a set speed; the liquid level is kept at the set height of the target lithium battery, and periodic fluctuation is applied; And carrying out local spraying or flushing on the set position of the target lithium battery. Further, determining the sealability of the target lithium battery based on the monitoring result includes: And if the monitoring result is one of the following states, determining that the sealing of the target lithium battery fails: The insulation resistance of the target lithium battery is reduced to be below a safety threshold value at a set speed; the difference between the internal air pressure and the external air pressure of the target lithium battery changes at a set rate; The target lithium battery has continuous bubbles. Further, after determining that the seal of the target lithium battery fails, the method further comprises: the leak point of the target lithium battery is located based on the level height at the time of seal failure or the observed bubble source. Further, after determining that the seal of the target lithium battery fails, the method further comprises: estimating a leakage rate of the target lithium battery based on a rate of change of a difference between an internal air pressure and an external air pressure of the target lithium battery in combination with an internal cavity volume of the target lithium battery; and determining a seal level of the target lithium battery based on the leak rate. Further, monitoring the state