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Method and device for testing wettability of battery cell pole group

A test method and a test device technology, which are applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve problems such as poor wetting effect of pole pieces, serious stress on batteries, abnormal center of pole pieces, etc., so as to facilitate technical realization and facilitate Observation and control of flow rate, effect suitable for test requirements

Inactive Publication Date: 2021-12-24
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] With the repeated charging and discharging of the battery, the positive and negative electrodes continue to shrink and expand, and the electrolyte continues to react and consume, which makes the wetting effect of the electrodes worse, and the expansion of the negative electrode causes more serious stress on the battery cell.
Especially in the center of the pole piece, the situation of force extrusion is more obvious; it is easy to cause abnormalities in the center of the pole piece

Method used

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  • Method and device for testing wettability of battery cell pole group
  • Method and device for testing wettability of battery cell pole group
  • Method and device for testing wettability of battery cell pole group

Examples

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Embodiment 1

[0035] The invention relates to a method for testing the wetting performance of an electrode group of an electric core. The method provides a parameter standard for characterizing the performance of an electrode group infiltrated with an electrolyte solution and the method steps for obtaining the test.

[0036] On the whole, in the test method of the wettability of the cell electrode group, firstly, the cell electrode group is placed under the simulated extrusion condition with the pre-tightening force K set. Afterwards, the electrolyte was dripped into the cell electrode assembly from above the cell electrode assembly at a constant flow rate, and the time T1 at which the dripping started was recorded. After that, observe the time for the electrolyte to flow out from the bottom of the cell electrode group, and record this time as T2. Finally, the difference between T2 and T1 is used as the outflow time ΔT to characterize the wetting performance of the cell electrode group unde...

Embodiment 2

[0055] The present invention relates to a test device for the wetting performance of the battery electrode group. The test device is set based on the test method for the wetting performance of the battery electrode group provided in Embodiment 1. An exemplary structure thereof is as follows image 3 As shown, it mainly includes an extrusion platform for simulating the extrusion working conditions of the cell electrode group 1, and a dripping device arranged above the extrusion platform.

[0056] Among them, two pressure plates with adjustable spacing are arranged on the extrusion platform, and the two pressure plates can fix the cell electrode group 1, and the extrusion force given to the cell electrode group 1 by the two pressure plates can be changed through adjustment. The pressure plate is adopted, and the clamping force of the pressure plate can be adjusted through guiding, locking and other structures. It has the advantages of simple structure, convenient construction, et...

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Abstract

The invention provides a method and device for testing the wettability of a battery cell pole group. According to the method for testing the wettability of the battery cell pole group, the battery cell pole group is placed under a simulated extrusion working condition with a set pre-tightening force K, electrolyte is dropped into the battery cell pole group from the position above the battery cell pole group at a constant flow speed, and the time T1 when the electrolyte is dropped is recorded; the time when the electrolyte flows out of the bottom of the battery cell pole group is observed, and the time is recorded as T2; the difference value of T2 and T1 is used as the outflow time T to represent the infiltration performance of the battery cell pole group under the pretightening force K. According to the method for testing the wettability of the battery cell pole group, a set pre-tightening force is applied to the battery cell pole group, and then the battery cell pole group is subjected to an electrolyte dripping test at a uniform flow rate; the outflow time T for representing the electrolyte wettability of the battery cell pole group can be measured; and by setting uniform pre-tightening force and dripping flow velocity, the wettability of battery cell pole groups with the same size specification can be tested.

Description

technical field [0001] The invention relates to the technical field of battery performance testing, in particular to a method for testing the infiltration performance of a battery electrode group. In addition, the present invention also relates to a testing device. Background technique [0002] Lithium-ion batteries are limited by the space in the module during use. During the charging and discharging process, due to factors such as self-expansion, the battery cell electrode group will be subjected to extrusion force. [0003] During the charging process of the battery, the positive electrode shrinks due to the release of Li; at the same time, part of the electrolyte will be squeezed out, and the free electrolyte in the battery will be replenished to the inside of the battery. Li extracted from the positive electrode is embedded in the negative electrode, causing rapid expansion of the negative electrode sheet (expansion rate ≈ 25%); with the embedding of Li, the distance b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N13/00G01N13/04
CPCG01N13/00G01N13/04
Inventor 刘颖杜建平姚洋洋
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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