CN-122028533-A - Method and equipment for testing damp and hot of battery piece

CN122028533ACN 122028533 ACN122028533 ACN 122028533ACN-122028533-A

Abstract

The application relates to a battery piece damp-heat testing method and equipment thereof, wherein the battery piece damp-heat testing method comprises the steps of welding and cutting a bare battery piece to obtain a battery piece to be tested; the method comprises the steps of placing a battery piece to be tested in an environment box for damp-heat testing, obtaining the contact resistance of the battery piece to be tested after the damp-heat testing, and obtaining the damp-heat testing result of the battery piece to be tested according to the contact resistance. According to the application, the wet and hot test is directly carried out on the battery piece to be tested after the welding and the segmentation of the lithium battery piece, the working procedures such as lamination are not needed, the influence of the working procedures such as lamination on the battery structure can be avoided, and the test period is shortened.

Inventors

TANG JIALI
Liu Chaohang
HAO JIANGBO

Assignees

天合光能股份有限公司

Dates

Publication Date: 20260512
Application Date: 20241106

Claims (10)

1. The battery piece damp-heat testing method is characterized by comprising the following steps of: welding and cutting the bare cell to obtain a cell to be tested; Placing the battery piece to be tested in an environment box for wet and hot testing; Acquiring the contact resistance of the battery piece to be tested after the damp-heat test; And acquiring a wet and hot test result of the battery piece to be tested according to the contact resistance.
2. The method of claim 1, wherein welding and dividing the bare cell to obtain the battery cell to be tested comprises: welding a plurality of bare cell chips to obtain a prepared battery string; removing welding strips at two ends of the prepared battery string; and dividing the prepared battery string to obtain the battery piece to be tested.
3. The method of claim 2, wherein welding the plurality of bare cells to obtain a preliminary battery string comprises: Obtaining a machine adjusting sheet; And welding a plurality of bare cell chips under the calibration action of the conditioner chip to obtain the preparation battery string.
4. The method according to claim 2, wherein dividing the preliminary battery string to obtain the battery piece to be tested includes: And dividing a plurality of battery pieces without empty welding and without empty welding in the prepared battery string to serve as the battery to be tested.
5. The method for testing the humidity and heat of the battery piece according to claim 1, wherein the battery piece to be tested is placed in an environment box for the humidity and heat test, comprising: Placing at least two battery false pieces and a plurality of battery pieces to be tested in a battery basket, wherein the two battery false pieces are respectively close to two edges of the battery basket, and the plurality of battery pieces to be tested are arranged between the two battery false pieces at intervals; And placing the battery basket in the environment box with preset test conditions to perform the damp-heat test.
6. The method for testing the humidity and the heat of the battery piece according to claim 5, wherein the preset testing conditions comprise temperature, humidity and time, wherein the temperature T meets the conditions that the temperature T is not less than 45 ℃ and not more than 95 ℃, the humidity RH meets the conditions that the humidity RH is not less than 65% RH is not less than 100%, and the time T meets the conditions that the temperature T is not less than 10H and not more than T is not more than 100H.
7. The method for testing the wet heat of the battery piece according to claim 1, wherein obtaining the contact resistance of the battery piece to be tested after the wet heat test comprises: Cutting the battery piece to be tested to obtain a plurality of front battery strips to be tested and a plurality of back battery strips to be tested; performing contact resistance test on the plurality of front-side battery strips to be tested and the plurality of back-side battery strips to be tested; taking the average value of the contact resistances of the plurality of front-side battery strips to be measured as the front-side contact resistance of the battery piece to be measured; And taking the average value of the contact resistances of the plurality of the battery strips to be measured on the back as the back contact resistance of the battery piece to be measured.
8. The method for testing the wet heat of the battery piece according to claim 7, wherein obtaining the wet heat test result of the battery piece to be tested according to the contact resistance comprises: And when the front contact resistance is smaller than 15 omega and the front contact resistance is smaller than 3 omega, the wet heat test result is passed.
9. The method for testing the wet heat of the battery piece according to claim 1, wherein before the welding and the dividing of the bare cell piece to obtain the battery piece to be tested, further comprises: Detecting the appearance of the bare cell; and when the appearance of the bare cell meets the preset condition, numbering the bare cell so as to establish the corresponding relation between the bare cell and the wet heat test result through the numbering, wherein the appearance of the bare cell comprises at least one of scratch size, crack size, unfilled corner size and chromatic aberration size of the surface of the bare cell.
10. The battery piece damp heat testing device is used for realizing the battery piece damp heat testing method according to any one of claims 1 to 9, and comprises the following steps: The combined device is used for welding and dividing the bare cell to obtain a cell to be tested; the environment box is used for placing the battery piece to be tested in the environment box for wet and hot testing; the detection device is used for acquiring the contact resistance of the battery piece to be tested after the damp-heat test; And the data processing device is used for acquiring a wet and hot test result of the battery piece to be tested according to the contact resistance.

Description

Method and equipment for testing damp and hot of battery piece Technical Field The application relates to the technical field of photovoltaic cell testing, in particular to a method and equipment for testing the damp and hot of a cell. Background The component DH1000H (DH is Damp Heat, meaning that H represents hours) is an important test for measuring the reliability of the Damp Heat of the component, and the component DH is judged to be invalid by testing the power attenuation ratio before and after the component DH, and more than 5% is judged to be invalid. But the biggest problem that it exists is that the period is long, and it is difficult to match with the rapid research and development iteration of the battery assembly. Disclosure of Invention In view of the foregoing, it is desirable to provide a method and apparatus for testing wet heat of a battery cell, which can shorten the period of testing wet heat of a battery cell. In a first aspect, the present application provides a method for testing the damp heat of a battery piece, where the method includes: welding and cutting the bare cell to obtain a cell to be tested; Placing the battery piece to be tested in an environment box for wet and hot testing; Acquiring the contact resistance of the battery piece to be tested after the damp-heat test; And acquiring a wet and hot test result of the battery piece to be tested according to the contact resistance. In one embodiment, welding and dividing the bare cell to obtain the to-be-measured cell includes: welding a plurality of bare cell chips to obtain a prepared battery string; removing welding strips at two ends of the prepared battery string; and dividing the prepared battery string to obtain the battery piece to be tested. In one embodiment, welding the plurality of bare cell chips to obtain a preliminary battery string includes: Obtaining a machine adjusting sheet; And welding a plurality of bare cell chips under the calibration action of the conditioner chip to obtain the preparation battery string. In one embodiment, the dividing the preliminary battery string to obtain the to-be-measured battery piece includes: And dividing a plurality of battery pieces without empty welding and without empty welding in the prepared battery string to serve as the battery to be tested. In one embodiment, the method for testing the humidity and heat of the battery piece to be tested in the environment box comprises the following steps: Placing at least two battery false pieces and a plurality of battery pieces to be tested in a battery basket, wherein the two battery false pieces are respectively close to two edges of the battery basket, and the plurality of battery pieces to be tested are arranged between the two battery false pieces at intervals; And placing the battery basket in the environment box with preset test conditions to perform the damp-heat test. In one embodiment, the preset test conditions comprise temperature, humidity and time, wherein the temperature T meets the conditions that the temperature T is not less than 45 ℃ and not more than 95 ℃, the humidity RH meets the conditions that the RH is not less than 65% and not more than RH and not more than 100%, and the time T meets the conditions that the temperature T is not less than 10H and not more than T and not more than 100H. In one embodiment, obtaining the contact resistance of the battery piece to be tested after the damp-heat test includes: Cutting the battery piece to be tested to obtain a plurality of front battery strips to be tested and a plurality of back battery strips to be tested; performing contact resistance test on the plurality of front-side battery strips to be tested and the plurality of back-side battery strips to be tested; taking the average value of the contact resistances of the plurality of front-side battery strips to be measured as the front-side contact resistance of the battery piece to be measured; And taking the average value of the contact resistances of the plurality of the battery strips to be measured on the back as the back contact resistance of the battery piece to be measured. In one embodiment, obtaining the wet heat test result of the to-be-tested battery piece according to the contact resistance includes: And when the front contact resistance is smaller than 15 omega and the front contact resistance is smaller than 3 omega, the wet heat test result is passed. In one embodiment, before welding and dividing the bare cell to obtain the to-be-measured cell, the method further includes: Detecting the appearance of the bare cell; and when the appearance of the bare cell meets the preset condition, numbering the bare cell so as to establish the corresponding relation between the bare cell and the wet heat test result through the numbering, wherein the appearance of the bare cell comprises at least one of scratch size, crack size, unfilled corner size and chromatic aberration size of the surface of the bare cell. In