电池模块CMT焊技术研究
2018-11-21佟雪松
佟雪松
摘 要:近几年新能源行业出现井喷式发展,各动力电池厂、Pack集成厂为抢占市场,积极开发新型Pack集成技术。集成技术的关键技术指标之一为安全,电池模块作为Pack内关键零部件,其集成质量直接影响Pack安全性能。CMT焊技术由于其焊接强度高、抗震性能好、低热输入、无飞溅、易实现自动化、成本低的特点,被引入Pack集成领域,获得行业认可。文章重点研究CMT焊技术在电池模块集成方面的应用,介绍焊接技术指标、质量评价手段、常见缺陷成因、改善方案等。
关键词:电池模块;CMT;气孔;激光寻址
中图分类号:TG44 文献标志码:A 文章编号:2095-2945(2018)28-0162-03
Abstract: In recent years, the new energy industry has a blowout development, power battery plants, Pack integration plants to seize the market, and actively develop new Pack integration technology. Safety is one of the key technical indexes of integration technology. Battery module is the key component of Pack, and its integration quality directly affects the safety performance of Pack. CMT welding technology because of its high welding strength, good seismic performance, low heat input, no splash, easy to achieve automation, low cost, has been introduced into the field of Pack integration, and has been recognized by the industry. This paper focuses on the application of CMT welding technology in battery module integration, introduces the welding technical indicators, quality evaluation means, the causes of common defects, improvement programs and so on.
Keywords: battery module; CMT; pore; laser addressing
1 概述
随着新能源行业技术的不断进步,各电池厂、Pack厂陆续推出高比能量、高结构强度、高安全性能的模块,新型电池模块采用金属边框CMT焊接工艺。CMT焊接不良将会降低模块机械强度及标准化程度,整车使用过程易发生安全事故,厂内焊缝缺陷需要人工修复,增加材料、人工、时间成本,造成浪費,同时CMT焊接采用设备自动焊,焊接质量决定模块线直通率及节拍,因此,保证电池模块的CMT焊质量至关重要。
2 总体方案
电池模块采用两铝合金端板(6063-T6)、两铝合金侧板(5083-O)堆叠拼接在一起,两种部件自身具备强度高、重量轻、易焊接的特点,侧板与端板贴合,形成4条拼接缝,拼接缝处利用CMT焊沿缝隙焊牢,形成4条焊缝。
3 试验方案
3.1 试验内容
堆叠X型、Y型模块各5个并进行CMT焊,制定各20条焊缝样本,对焊接效果进行评价并分析失效原因,对关键技术难题制定解决方案。……
