膨脹力測試概述About Pressure Analysis

電芯實際使用時是束縛在模組內(nèi)，充放電過程中厚度的變化引起膨脹力會直接影響電芯、模組及電池包的電性能、安全及可靠性等表現(xiàn)。During charge and discharge, the cell’s thickness change lead to the pressure variation, directly influence the performance of electrochemical properties, safety and reliability of cell, module and battery. 為了研究清楚上述變化與關(guān)聯(lián)，對于電芯在實際工作時結(jié)構(gòu)與狀態(tài)的模擬與仿真（即電芯原位膨脹厚度、原位膨脹壓力特征參數(shù)）非常重要，其具體方式如下圖。In order to study the change and correlation clearly, the modeling and simulation for the actual work structure and status of batteries (in-situ thickness, in-situ pressure characteristic parameter) are very important. as is shown in the following diagram.

膨脹力測試概述About Pressure Analysis

材料不可逆損耗與劣化引起的極片/電芯逐漸變厚、析鋰等(如下圖)。對于膨脹及析鋰評價的傳統(tǒng)方法非原位、破壞性、成本高、效率低而且偏差大，已不能滿足當(dāng)前研究開發(fā)需求. Irreversible loss and degradation lead to electrode /Cell gradually thickness increase, ALP, etc. Ex-situ and destructive traditional methods can't meet current requirement due to its high cost, low efficiency, large deviation.

實現(xiàn)扣電、單層疊片、軟包與方殼電芯等原位膨脹力與厚度測量；Realize in-situ pressure and thickness test for Coin, single stack, pouch and prismatic cell;

為電芯材料開發(fā)、結(jié)構(gòu)設(shè)計、工藝優(yōu)化及相關(guān)機(jī)理研究提供支撐；Provide help for materials development, structural design, process optimization and related mechanism research;

為模組、電池包設(shè)計提供可靠的結(jié)構(gòu)參數(shù)。 Provide reliable mechanical parameters for module, pack design.

解決方案與產(chǎn)品 Solution and Product

應(yīng)用領(lǐng)域與方向Application Fields

鋰電池、超級電容器等二次電池相關(guān)領(lǐng)域的生產(chǎn)制造企業(yè)、大學(xué)及科研院所科研過程；

Manufacturing enterprises, universities and scientific research institutes of lithium battery, supercapacitor and other secondary battery related fields;

一體化恒間距膨脹力：New AIO Solution

普通墊片恒間隙膨脹力

薄膜傳感器原理

薄膜感測片由上下兩層柔性可彎折的薄膜材料組成，上層為壓感功能薄膜，下層為電極薄膜感測片受壓時，上下兩層薄膜發(fā)生接觸，其接觸面積、接觸形變會隨著壓力大小變化而變化，從而使電極端產(chǎn)生隨壓力變化而產(chǎn)生的電阻抗信號量的變化。

感測片上每一個壓力點的原始壓力特性呈現(xiàn)為與受壓壓力線性變化的一條壓力曲線。感測片的出廠測試、標(biāo)定過程中，會記錄每一個點的原始壓力曲線，形成每一感測片專有的MAP標(biāo)定文件。

消 費(fèi) 類 電 池 化 成 壓 合 與 壓 敏 紙 對 比，可以看出電芯循環(huán)過程中出現(xiàn)受力不均勻情況。同時，化成設(shè)備的夾具之間夾板力出現(xiàn)不均勻； It can be seen that the pressure is not uniform in the process. At the same time, the splint pressure between the jigs of the formation equipment is uneven.

審核編輯黃宇