CN104701388A - 用于背接触太阳能组件的高可靠性芯板及其制备方法 - Google Patents
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Abstract
用于背接触太阳能组件的高可靠性芯板，它由下至上包括支撑层和导电层，支撑层上开有若干通孔，该若干通孔内靠近导电层的一侧均设有一个电极，所述电极为双金属层复合箔结构，其中一层金属层的材质与导电层的材质相同并焊接在导电层的背面，另一层金属层的材质选用易锡焊材料并面向下方。本芯板在使用过程中，由于消除了热胀冷缩以及电化学腐蚀等因素，从而能够防止焊接点失效，减小性能损耗，保证了本芯板的使用安全性和可靠性，并能够减小汇流引出的接触电阻。
Description
技术领域
本发明涉及太阳能电池领域，具体地说涉及一种用于背接触太阳能组件的高可靠性芯板及其制备方法。
背景技术
随着太阳能电池技术的发展，背接触式太阳能电池成为发展趋势，背接触式太阳能电池在成产过程中不需要串焊工序，其制备过程简单、生产效率高，而且背接触式太阳能电池的挡光少，具有优异的产品性能。其电极引出主要靠背板导电层预留位置通过锡焊引出汇流。
现有一种背接触式太阳能电池背板，它包括基板、芯板和绝缘层。其中芯板的结构参见说明书附图1，它由下至上包括支撑层1和导电层2，支撑层1上开有若干通孔11，以使汇流条通过并焊接在导电层2的背面，最后通过汇流条使导电层2与接线盒相连接。
目前芯板中的导电层的材质有铜或铜基合金，以及非铜或非铜基合金材料，对于非铜或非铜基合金而言，在用锡焊或者类似的焊接方式焊接汇流条时不易有良好的浸润性，且焊点电阻大、接触面的抗拉机械强度低、可靠性差，使用过程中易发热，而且由于热胀冷缩以及电化学腐蚀等因素，会导致焊接点失效，形成性能损耗和安全性隐患。
发明内容
本发明所要解决的技术问题是提供一种在焊接汇流条时易焊接、焊接可靠，且能减小性能损耗、使用安全可靠的用于背接触太阳能组件的高可靠性芯板。
为了解决上述技术问题，本发明采用如下技术方案：用于背接触太阳能组件的高可靠性芯板，它由下至上包括支撑层和导电层，支撑层上开有若干通孔，该若干通孔内靠近导电层的一侧均设有一个电极，所述电极为双金属层复合箔结构，其中一层金属层的材质与导电层的材质相同并焊接在导电层的背面，另一层金属层的材质选用易锡焊材料并面向下方。
为简洁描述起见，以下本发明所述的用于背接触太阳能组件的高可靠性芯板简称为本芯板。
本芯板采用了双金属层复合箔结构的电极作为焊接过渡件，这样在焊接汇流条时，只要将汇流条用锡焊的方式焊接在电极的下层金属层上即可，由于与导电层焊接相连的电极的上层金属层的材质和导电层的材质相同，这样可以保证电极和导电层之间具有非常好的浸润性，且焊点电阻小、接触面的抗拉机械强度高、可靠性好，从而能够更容易、更好地使上述两者之间融接到一起，保证了电极与导电层之间的焊接可靠性以及后续使用过程中的安全性，且两者之间不会有电化学反应；在锡焊汇流条时，由于电极的下层金属层选用了易锡焊材料，因此能够降低汇流引出端的接触电阻并增加接触面的机械强度、抗拉性以及可靠性，保证汇流条的焊接具有非常好的效果；本芯板在使用过程中，由于消除了热胀冷缩以及电化学腐蚀等因素，从而能够防止焊接点失效，减小性能损耗，保证了本芯板的使用安全性和可靠性。
进一步的，所述易锡焊材料为铜或铜基合金。铜或铜基合金是一种来源广、性能好的以易锡焊材料，下层金属层的材质选用铜可以保证焊接效果。
本发明还提供一种用于背接触太阳能组件的高可靠性芯板的制备方法，包括以下步骤：
（1）用滚压的方法将上下金属层复合到一起，制得双金属层复合箔结构的电极；
（2）将电极焊接在导电层的背面；
（3）在支撑层上打孔；
（4）采用卷对卷热流压射的方法将支撑层和导电层复合到一起。
为简洁说明起见，以下本发明所述的用于背接触太阳能组件的高可靠性芯板的制备方法简称为本方法。
本方法工艺简单、易操作、成本低，可适用于工业化大规模生产。
附图说明
图1是现有用于背接触太阳能组件的芯板的结构示意图。
图2是本发明一实施例提供的用于背接触太阳能组件的高可靠性芯板的结构示意图。
具体实施方式
下面结合附图对本发明作进一步描述：
参见附图2。
本发明一实施例提供的用于背接触太阳能组件的高可靠性芯板，它由下至上包括支撑层1和导电层2，支撑层1的材质可选用乙烯-醋酸乙烯共聚物（EVA）、聚乙烯醇缩丁醛（PVB）、聚烯烃类等本领域常用材质，支撑层1上开有若干通孔11，该若干通孔11内靠近导电层2的一侧均设有一个电极3，通孔11及相应电极3的数量跟据设计要求确定，一般是2—6个，所述电极3为双金属层复合箔结构，电极3的面积为0.01平方毫米—400平方毫米、厚度为1微米—500微米，电极3的其中一层金属层31的材质与导电层2的材质相同并焊接在导电层2的背面，另一层金属层32的材质选用易锡焊材料并面向下方，所述易锡焊材料优选为铜或铜基合金。
上述用于背接触太阳能组件的高可靠性芯板的制备方法，包括以下步骤：
（1）用滚压的方法将上下金属层复合到一起，制得双金属层复合箔结构的电极；
（2）将电极焊接在导电层的背面，焊接方式可选用激光焊接、或者超声点焊、或者电阻焊；
（3）在支撑层上打孔；
（4）采用卷对卷热流压射的方法将支撑层和导电层复合到一起，加热温度范围为0℃—200℃，真空度为1Pa—100Pa，时间为1分钟到20分钟。
以上所述仅为本发明的较佳实施例，并不用以限制本发明，凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本发明的保护范围之内。
Claims (3)
1.用于背接触太阳能组件的高可靠性芯板，它由下至上包括支撑层和导电层，其特征在于：支撑层上开有若干通孔，该若干通孔内靠近导电层的一侧均设有一个电极，所述电极为双金属层复合箔结构，其中一层金属层的材质与导电层的材质相同并焊接在导电层的背面，另一层金属层的材质选用易锡焊材料并面向下方。
2.如权利要求1所述的用于背接触太阳能组件的高可靠性芯板，其特征在于：所述易锡焊材料为铜或铜基合金。
3.如权利要求1或2所述的用于背接触太阳能组件的高可靠性芯板的制备方法，包括以下步骤：
（1）用滚压的方法将上下金属层复合到一起，制得双金属层复合箔结构的电极；
（2）将电极焊接在导电层的背面；
（3）在支撑层上打孔；
（4）采用卷对卷热流压射的方法将支撑层和导电层复合到一起。
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105428660A (zh) * | 2015-12-27 | 2016-03-23 | 广州丰江电池新技术股份有限公司 | 超薄锂离子电池集流体、超薄锂离子电池及其制造方法 |
| CN115207159A (zh) * | 2022-07-07 | 2022-10-18 | 隆基绿能科技股份有限公司 | 太阳能电池制备方法、太阳能电池及电池组件 |
| WO2024008183A1 (zh) * | 2022-07-07 | 2024-01-11 | 隆基绿能科技股份有限公司 | 太阳能电池制备方法、太阳能电池及电池组件 |
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- 2015-03-15 CN CN201510112356.9A patent/CN104701388A/zh active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105428660A (zh) * | 2015-12-27 | 2016-03-23 | 广州丰江电池新技术股份有限公司 | 超薄锂离子电池集流体、超薄锂离子电池及其制造方法 |
| CN115207159A (zh) * | 2022-07-07 | 2022-10-18 | 隆基绿能科技股份有限公司 | 太阳能电池制备方法、太阳能电池及电池组件 |
| WO2024008183A1 (zh) * | 2022-07-07 | 2024-01-11 | 隆基绿能科技股份有限公司 | 太阳能电池制备方法、太阳能电池及电池组件 |
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