WO2017020399A1 - 结构胶纸 - Google Patents

结构胶纸 Download PDF

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Publication number
WO2017020399A1
WO2017020399A1 PCT/CN2015/089490 CN2015089490W WO2017020399A1 WO 2017020399 A1 WO2017020399 A1 WO 2017020399A1 CN 2015089490 W CN2015089490 W CN 2015089490W WO 2017020399 A1 WO2017020399 A1 WO 2017020399A1
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Prior art keywords
substrate
adhesive layer
structural adhesive
adhesive tape
structural
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PCT/CN2015/089490
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English (en)
French (fr)
Inventor
戴志芳
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宁德新能源科技有限公司
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Publication of WO2017020399A1 publication Critical patent/WO2017020399A1/zh

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    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09JADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J11/00Features of adhesives not provided for in group C09J9/00, e.g. additives
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09JADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00Adhesives in the form of films or foils
    • C09J7/20Adhesives in the form of films or foils characterised by their carriers
    • C09J7/21Paper; Textile fabrics

Definitions

  • the invention relates to the field of adhesive tape, in particular to a structural adhesive tape.
  • the conventional structural adhesive paper layer is added at the position of the tabs before coating, and the adhesive surface thereof is an empty foil area. After the coating operation is completed (because the coating is a complete coating, the active material layer of equal thickness will be Coating on the conventional structural adhesive layer) and then removing the adhesive layer to reserve a position for the tabs.
  • the use of conventional structural adhesive tape has the following problems: (1) it is impossible to control the curling direction of the conventional structural adhesive tape, and it is easy to stick to the active material layer in the normal coating film region (ie, the region where the active material layer is coated), resulting in a large number of poles. The appearance of the sheet is bad, and the energy density of the electrochemical device using the pole piece is lowered; (2) the contact area of the conventional structural adhesive tape is small, the viscosity is weak, and it is easy to fall off from the current collector during the drying process.
  • the conventional structural adhesive paper is curled, and the thickness of the active material layer in the peripheral edge region of the conventional structural adhesive paper peeling is larger than the thickness of the active material coating in the normal region, especially in the conventional structural adhesive paper region.
  • the uniformity of the active material layer in the direction parallel to the axis of the press roll is even worse, thereby making it easier to cause breakage at the conventional structural adhesive tape area during the subsequent process of rolling.
  • Another object of the present invention is to provide a structural adhesive tape which can control the degree of curling of the structural adhesive tape, ensure that the intermediate portion is not adhered to the object to be bonded, and prevent the structural adhesive tape from being adhered to the object during the heat receiving process. Fall off.
  • the present invention provides a structural adhesive tape comprising: a first adhesive layer for bonding to an object to be bonded; and a first substrate adhered to the first adhesive layer And the first blowing agent particles are distributed in the first adhesive layer.
  • the first blowing agent particles are foamed such that the first substrate is curled from the opposite side edges of the width direction toward the intermediate portion so that both sides of the first adhesive layer are The portion is separated from the object to be bonded and the intermediate portion of the first adhesive layer is adhered to the object to be bonded without being peeled off.
  • the first foaming agent particles are foamed so that the structural adhesive paper is curled from the opposite side edges toward the middle portion in the width direction, effectively controlling the curling direction of the structural adhesive tape; and the middle of the structural adhesive tape
  • the part remains adhered to the object to be bonded without being peeled off, and an effective bonding area can be ensured, and the structural adhesive tape can be prevented from falling off from the object to be bonded during the heating process.
  • Figure 1 is a perspective view of a current collector applied to a structural adhesive tape according to the present invention
  • Figure 2 is a perspective view of a structural adhesive tape adhered to a current collector according to the present invention
  • Figure 3 is a perspective view of a structural adhesive paper coated active material layer in accordance with the present invention.
  • Figure 4 is a perspective view of the structural adhesive tape after peeling according to the present invention.
  • Figure 5 is a perspective view of a first embodiment of a structural adhesive tape in accordance with the present invention.
  • Figure 6 is a cross-sectional view of the structural adhesive tape of Figure 5 taken along line A-A;
  • Figure 7 is a perspective view of the structural adhesive tape of Figure 5 after being heated and crimped;
  • Figure 8 is a perspective view of a second embodiment of a structural adhesive tape in accordance with the present invention.
  • Figure 9 is a cross-sectional view of the structural adhesive tape of Figure 8 taken along line B-B;
  • Figure 10 is a perspective view of the structural adhesive tape of Figure 8 after being heated and crimped;
  • Figure 11 is a perspective view of a third embodiment of a structural adhesive tape according to the present invention.
  • Figure 12 is a cross-sectional view taken along line C-C of the structural adhesive tape of Figure 11;
  • Figure 13 is a perspective view of the structural adhesive tape of Figure 11 after being heated and crimped;
  • Figure 14 is a perspective view of a fourth embodiment of a structural adhesive tape according to the present invention.
  • Figure 15 is a cross-sectional view taken along line D-D of the structural adhesive tape of Figure 14;
  • Figure 16 is a perspective view of the structural adhesive tape of Figure 14 after being heated and crimped;
  • Figure 17 is a perspective view of a fifth embodiment of a structural adhesive tape according to the present invention.
  • Figure 18 is a cross-sectional view of the structural adhesive tape of Figure 17 taken along line E-E;
  • Figure 19 is a perspective view of the structural adhesive tape of Figure 17 after being heated and crimped.
  • a structural adhesive sheet 1 comprises: a first adhesive layer 11 for bonding to an object to be bonded (not shown); a first substrate 12, which is attached to the first An adhesive layer 11; and first blowing agent particles 13 are distributed in the first adhesive layer 11.
  • first blowing agent particles 13 are foamed such that the first substrate 12 is curled from the opposite side edges of the width direction W toward the intermediate portion, so that the first adhesive layer 11 The portion at both side edges is separated from the object to be bonded, and the intermediate portion of the first adhesive layer 11 is kept adhered to the object to be bonded without being peeled off.
  • the structural adhesive paper 1 is adhered to the object to be bonded, and when the structural adhesive paper 1 is heated, the first blowing agent particles 13 are foamed so that the structural adhesive paper 1 is oriented in the width direction W
  • the opposing side edges are curled toward the middle portion to effectively control the curling direction of the structural adhesive tape 1; and the intermediate portion of the structural adhesive tape 1 is kept from being bonded to the object to be bonded without peeling off, thereby ensuring an effective bonding area and preventing The structural adhesive sheet 1 is detached from the object to be bonded during the heating process.
  • the first adhesive layer 11 may be an acrylate layer.
  • the first substrate 12 may be PET (polyterephthalic plastic).
  • the first blowing agent particles 13 may be AC (azodiyl) Amine) blowing agent granules or OBSH (4,4-oxobis sulfonyl hydrazide) blowing agent granules.
  • the structural adhesive tape 1 may be rectangular.
  • the structural adhesive paper 1 can have a length of 22.5 mm.
  • the structural adhesive tape 1 can have a width of 11 mm.
  • the structural adhesive tape 1 may further include: a first score 14 each of which is parallel to the width direction W and along The thickness direction T (wherein the thickness direction T is perpendicular to the width direction W and the length direction L) cuts through the first substrate 12 and cuts into the first adhesive layer 11, and the width of the first notch 14 is smaller than that of the structural adhesive tape 1
  • the width, the depth of the first score 14 is smaller than the sum of the thicknesses of the first adhesive layer 11 and the first substrate 12.
  • the cohesive force at the first indentation 14 is small, and the portion near the first indentation 14 is pre-curled after the structural adhesive tape 1 is heated to form an obstacle region, and the portion of the structural adhesive tape 1 in the width direction W is curled toward the opposite sides.
  • the effect of the barrier interval, the direction of curl and the degree of curl are controlled.
  • the first score 14 can be formed by die cutting.
  • the thickness of the first adhesive layer 11 may be 45 ⁇ m.
  • the thickness of the first substrate 12 may be 15 ⁇ m.
  • the depth of the first score 14 may be 55 ⁇ m.
  • the structural adhesive tape 1 may further include: a second adhesive layer 15 adhered to the width direction W of the first substrate 12 In the middle portion, there is no foaming agent particles inside, the length of the second adhesive layer 15 is the same as the length of the first substrate 12, and the width of the second adhesive layer 15 is smaller than the width of the first substrate 12;
  • the second substrate 16 is adhered to the second adhesive layer 15, the length of the second substrate 16 is the same as the length of the first substrate 12, and the width of the second substrate 16 is smaller than the width of the first substrate 12 and The width of the two substrates 16 is equal to the width of the second adhesive layer 15.
  • the first adhesive layer 11 of the structural adhesive tape 1 and the first base material 12 are curled by the first blowing agent particles 13, and the second adhesive layer 15 is not foamed inside.
  • the particles do not curl, so that the first adhesive layer 11 and the first substrate 12 are curled to the positions of the second adhesive layer 15 and the second substrate 16, and the curl direction and the degree of curl are controlled. .
  • the second adhesive layer 15 and the second base material 16 may be rectangular.
  • the thickness of the first adhesive layer 11 may be 35 ⁇ m.
  • the thickness of the first substrate 12 may be 25 ⁇ m.
  • Second adhesive layer 15 The thickness is 5 ⁇ m.
  • the second substrate 16 may have a thickness of 36 ⁇ m.
  • the structural adhesive tape 1 may further include: a third adhesive layer 17, adhered to the first substrate 12, and a third The adhesive layer 17 has the same shape as the first substrate 12; the third substrate 18 is adhered to the third adhesive layer 17, the third substrate 18 has the same shape as the first substrate 12; and the second The blowing agent particles 19 are distributed in the third adhesive layer 17, and the foaming temperature of the second blowing agent particles 19 is lower than the foaming temperature of the first blowing agent particles 13.
  • the foaming temperature of the second blowing agent particles 19 is low, so the third adhesive layer 17 and the third substrate 18 are first curled, and when the heated temperature continues to rise, the first blowing agent The particles 13 foam and push the first adhesive layer 11 and the first base material 12 to curl, and are curled to the positions of the third adhesive layer 17 and the third base material 18, and the curling direction and the degree of curling are controlled.
  • the structural adhesive tape 1 may further include: a second score N which is parallel to the width direction W and along the thickness
  • the direction T cuts through the third substrate 18 and cuts into the third adhesive layer 17, and the width of the second score N is smaller than the width of the third substrate 18, and the depth of the second score N is smaller than the third adhesive layer.
  • the cohesive force at the second score N is small.
  • the adhesive layer 17 and the third base material 18 are curled toward the intermediate portion from the opposite sides of the width direction W, and are affected by the barrier region to ensure the bonding area of the third adhesive layer 17 and the first substrate 12;
  • the first blowing agent particles 13 foam and push the first adhesive layer 11 and the first substrate 12 to be crimped to the third adhesive layer 17 and the third substrate 18
  • the position is hindered, and the direction of curl and the degree of curl are controlled.
  • the second blowing agent particles 19 may be AC (azodicarbonamide) blowing agent particles or OBSH (4,4-oxobis sulfonyl hydrazide) blowing agent particles. .
  • the thickness of the first adhesive layer 11 may be 40 ⁇ m.
  • the thickness of the first substrate 12 may be 40 ⁇ m.
  • the thickness of the third adhesive layer 17 is 30 ⁇ m.
  • the third substrate 18 may have a thickness of 15 ⁇ m.
  • the depth of the second score N is 40 ⁇ m.
  • the first blowing agent particles 13 are distributed at opposite sides of the width direction W of the first adhesive layer 11 And The intermediate portion of the first adhesive layer 11 in the width direction W is free of the first blowing agent particles 13.
  • the first blowing agent particles 13 are foamed so that the structural adhesive sheet 1 is curled from the opposite side edges of the width direction W toward the intermediate portion, effectively controlling the curling direction of the structural adhesive sheet 1;
  • the intermediate portion of the structural adhesive sheet 1 is free of the first blowing agent particles 13 to form a restriction on the curled portion.
  • the object to be bonded is the current collector 2, and before the active material layer 3 is applied on the current collector 2, the first adhesive is applied.
  • the adhesive layer 11 is adhered to the reserved region 21 of the current collector 2 forming the tabs.
  • the active material layer 3 is dried, and the structural adhesive paper 1 is heated and baked.
  • the first blowing agent particles 13 are foamed such that the first substrate 12 is curled toward the intermediate portion by the opposite side edges of the width direction W so that the portions at both side edges of the first adhesive layer 11 are Disengaging from the current collector 2 and simultaneously activating the active material layer 3 at the periphery of the reserved region 21, while the intermediate portion of the first adhesive layer 11 remains bonded to the current collector 2 without peeling off; after drying, the peeling structure
  • the adhesive tape 1 forms a reserved area 21 of the tabs.
  • the structural adhesive tape 1 is adhered to the reserved area 21 of the current collector 2 forming the tabs. After coating and drying, the structural adhesive tape 1 is removed, thereby forming a reserved area 21 for the tab welding; the structural adhesive tape 1 is heated. When drying, the first blowing agent particles 13 are foamed so that the structural adhesive paper 1 is curled from the opposite side edges of the width direction W toward the intermediate portion, effectively controlling the curling direction of the structural adhesive tape 1, preventing the appearance of the pole piece Destruction, to ensure the energy density of the electrochemical device using the pole piece, to improve the utilization rate of the active material, to avoid waste of the active material, and at the same time, the orientation of the structural adhesive paper 1 is curled, effectively reducing the protrusion of the peeling edge, effectively reducing the subsequent roller
  • the possibility of breaking the belt during the pressing process; and the middle portion of the structural adhesive tape 1 is kept adhered to the current collector 2 without peeling off, which can ensure an effective bonding area and prevent the structural adhesive paper 1 from being collected from the current collector during the drying process

Abstract

本发明提供了一种结构胶纸,其包括:第一粘接剂层,用于粘接在被粘接对象上;第一基材,粘贴于第一粘接剂层上;第一发泡剂颗粒,分布于第一粘接剂层内。在结构胶纸受热时,第一发泡剂颗粒发泡以使得第一基材由宽度方向的对向两侧缘向中间部分卷曲,以使第一粘接剂层的两侧缘处的部分脱离被粘接对象而第一粘接剂层的中间部分保持与被粘接对象粘接不剥离。当结构胶纸受热烘干时,第一发泡剂颗粒发泡以使得结构胶纸由宽度方向的对向两侧缘向中间部分卷曲,有效地控制结构胶纸的卷曲方向;结构胶纸的中间部分保持与被粘接对象粘接不剥离,能保证有效的粘接面积,防止结构胶纸在受热过程中从被粘接对象上脱落。

Description

结构胶纸 技术领域
本发明涉及胶纸领域,尤其涉及一种结构胶纸。
背景技术
当前,锂离子电池的极片涂布之前,需要在集流体上预留出极耳的位置,保证极耳的焊接位置为集流体的未涂覆活性物质层的空箔区。在现有技术中,涂布前在极耳位置增加常规结构胶纸层,其粘贴面为空箔区,涂布操作完成后(由于涂布时为整涂,故等厚度的活性物质层将涂布在常规结构胶纸层上)再除去胶纸层即可为极耳预留出位置。然而,使用常规结构胶纸存在以下问题:(1)无法控制常规结构胶纸的卷曲方向,容易粘在正常涂膜区(即涂覆活性物质层的区域)的活性物质层上,造成大量极片的外观坏品,降低采用该极片的电化学装置的能量密度;(2)常规结构胶纸卷曲后与空箔区接触面积小,粘性弱,在烘干过程中容易从集流体上脱落并掉落在烘箱内部,造成烘箱的风口堵塞;(3)如前所述,由于等厚度的活性物质层将涂布在常规结构胶纸层上且由于前述无法控制常规结构胶纸的卷曲方向,所以在活性物质层干燥过程中常规结构胶纸卷曲,常规结构胶纸剥离的周边边缘区的活性物质层的厚度比正常区域的活性物质涂层的厚度大,尤其是在常规结构胶纸区域处活性物质层与压辊的轴线平行的方向上呈现的均匀更差,由此导致后工序辊压时更容易在常规结构胶纸区域处造成断带。
发明内容
鉴于背景技术中存在的问题,本发明的目的在于提供一种结构胶纸,其能控制结构胶纸的卷曲方向。
本发明的另一目的在于提供一种结构胶纸,其能控制结构胶纸的卷曲程度,保证中间部分与被粘接对象粘接不剥离,防止结构胶纸在受热过程中从被粘接对象上脱落。
为了实现上述目的,本发明提供了一种结构胶纸,其包括:第一粘接剂层,用于粘接在被粘接对象上;第一基材,粘贴于第一粘接剂层上;以及第一发泡剂颗粒,分布于第一粘接剂层内。其中,在结构胶纸受热时,第一发泡剂颗粒发泡以使得第一基材由宽度方向的对向两侧缘向中间部分卷曲,以使第一粘接剂层的两侧缘处的部分脱离被粘接对象而第一粘接剂层的中间部分保持与被粘接对象粘接不剥离。
本发明的有益效果如下:
当结构胶纸受热时,第一发泡剂颗粒发泡以使得结构胶纸由宽度方向的对向两侧缘向中间部分卷曲,有效地控制结构胶纸的卷曲方向;而结构胶纸的中间部分保持与被粘接对象粘接不剥离,能保证有效的粘接面积,防止结构胶纸在受热过程中从被粘接对象上脱落。
附图说明
图1为根据本发明的结构胶纸所应用的集流体的立体图;
图2为根据本发明的结构胶纸粘贴于集流体的立体图;
图3为根据本发明的结构胶纸涂布活性物质层的立体图;
图4为根据本发明的结构胶纸剥离后的立体图;
图5为根据本发明的结构胶纸的第一实施例的立体图;
图6为图5的结构胶纸的沿线A-A作出的剖视图;
图7为图5的结构胶纸的受热卷曲后的立体图;
图8为根据本发明的结构胶纸的第二实施例的立体图;
图9为图8的结构胶纸的沿线B-B作出的剖视图;
图10为图8的结构胶纸的受热卷曲后的立体图;
图11为根据本发明的结构胶纸的第三实施例的立体图;
图12为图11的结构胶纸的沿线C-C作出的剖视图;
图13为图11的结构胶纸的受热卷曲后的立体图;
图14为根据本发明的结构胶纸的第四实施例的立体图;
图15为图14的结构胶纸的沿线D-D作出的剖视图;
图16为图14的结构胶纸的受热卷曲后的立体图;
图17为根据本发明的结构胶纸的第五实施例的立体图;
图18为图17的结构胶纸的沿线E-E作出的剖视图;
图19为图17的结构胶纸的受热卷曲后的立体图。
其中,附图标记说明如下:
1结构胶纸                       19第二发泡剂颗粒
11第一粘接剂层                  N第二刻痕
12第一基材                      2集流体
13第一发泡剂颗粒                21预留区域
14第一刻痕                      3活性物质层
15第二粘接剂层                  W宽度方向
16第二基材                      L长度方向
17第三粘接剂层                  T厚度方向
18第三基材
具体实施方式
下面参照附图来详细说明根据本发明的的结构胶纸。
参照图1至图19,根据本发明的结构胶纸1包括:第一粘接剂层11,用于粘接在被粘接对象(未示出)上;第一基材12,粘贴于第一粘接剂层11上;以及第一发泡剂颗粒13,分布于第一粘接剂层11内。其中,在结构胶纸1受热时,第一发泡剂颗粒13发泡以使得第一基材12由宽度方向W的对向两侧缘向中间部分卷曲,以使第一粘接剂层11的两侧缘处的部分脱离被粘接对象而第一粘接剂层11的中间部分保持与被粘接对象粘接不剥离。
在根据本发明的结构胶纸中,结构胶纸1粘接于被粘接对象上,当结构胶纸1受热时,第一发泡剂颗粒13发泡以使得结构胶纸1由宽度方向W的对向两侧缘向中间部分卷曲,有效地控制结构胶纸1的卷曲方向;而结构胶纸1的中间部分保持与被粘接对象粘接不剥离,能保证有效的粘接面积,防止结构胶纸1在受热过程中从被粘接对象上脱落。
在根据本发明的结构胶纸中,第一粘接剂层11可为丙烯酸酯层。
在根据本发明的结构胶纸中,第一基材12可为PET(聚对苯二甲酸类塑料)。
在根据本发明的结构胶纸中,第一发泡剂颗粒13可为AC(偶氮二甲酰 胺)发泡剂颗粒或OBSH(4,4-氧代双本磺酰肼)发泡剂颗粒。
在根据本发明的结构胶纸中,参照图2,在一实施例中,结构胶纸1可为矩形。结构胶纸1的长度可为22.5mm。结构胶纸1的宽度可为11mm。
在根据本发明的结构胶纸中,参照图5至图7,在一实施例中,结构胶纸1还可包括:第一刻痕14,各第一刻痕14平行于宽度方向W并沿厚度方向T(其中,厚度方向T垂直于宽度方向W和长度方向L)切穿第一基材12并切入第一粘接剂层11,且第一刻痕14的宽度小于结构胶纸1的宽度,第一刻痕14的深度小于第一粘接剂层11和第一基材12的厚度之和。第一刻痕14处的内聚力较小,结构胶纸1受热后第一刻痕14附近的部分提前卷曲,形成障碍区域,结构胶纸1宽度方向W对向两侧缘处的部分卷曲后受到障碍区间的影响,卷曲方向和卷曲程度得到控制。
在根据本发明的结构胶纸中,第一刻痕14可通过模切形成。
在根据本发明的结构胶纸中,参照图6,在一实施例中,第一粘接剂层11的厚度可为45μm。第一基材12的厚度可为15μm。第一刻痕14的深度可为55μm。
在根据本发明的结构胶纸中,参照图8至图10,在一实施例中,结构胶纸1还可包括:第二粘接剂层15,粘贴于第一基材12宽度方向W的中间部分上,内部无发泡剂颗粒,第二粘接剂层15的长度与第一基材12的长度相同,第二粘接剂层15的宽度小于第一基材12的宽度;以及第二基材16,粘贴于第二粘接剂层15上,第二基材16的长度与第一基材12的长度相同,第二基材16的宽度小于第一基材12的宽度且第二基材16的宽度等于第二粘接剂层15的宽度。结构胶纸1受热后,结构胶纸1的第一粘接剂层11和第一基材12在第一发泡剂颗粒13的作用下卷曲,而第二粘接剂层15内部没有发泡剂颗粒,不会发生卷曲,所以第一粘接剂层11和第一基材12卷曲到第二粘接剂层15和第二基材16的位置时受到阻碍,卷曲方向和卷曲程度得到控制。
在根据本发明的结构胶纸中,参照图8至图10,在一实施例中,第二粘接剂层15和第二基材16可为矩形。
在根据本发明的结构胶纸中,参照图9,在一实施例中,第一粘接剂层11的厚度可为35μm。第一基材12的厚度可为25μm。第二粘接剂层15的 厚度为可5μm。第二基材16的厚度可为36μm。
在根据本发明的结构胶纸中,参照图11至图13,在一实施例中,结构胶纸1还可包括:第三粘接剂层17,粘贴于第一基材12上,第三粘接剂层17与第一基材12的形状相同;第三基材18,粘贴于第三粘接剂层17上,第三基材18与第一基材12的形状相同;以及第二发泡剂颗粒19,分布于第三粘接剂层17内,第二发泡剂颗粒19的发泡温度低于第一发泡剂颗粒13的发泡温度。结构胶纸1受热时,第二发泡剂颗粒19的发泡温度低,所以第三粘接剂层17和第三基材18首先卷曲,当受热温度继续升高时,第一发泡剂颗粒13发泡并推动第一粘接剂层11和第一基材12卷曲,卷曲至第三粘接剂层17和第三基材18的位置时受到阻碍,卷曲方向和卷曲程度得到控制。
在根据本发明的结构胶纸中,参照图14至图17,在一实施例中,结构胶纸1还可包括:第二刻痕N,第二刻痕N平行于宽度方向W并沿厚度方向T切穿第三基材18并切入第三粘接剂层17,且第二刻痕N的宽度小于第三基材18的宽度,第二刻痕N的深度小于第三粘接剂层17和第三基材18的厚度之和。第二刻痕N处的内聚力小,当结构胶纸1受热时,第二发泡剂颗粒19的发泡温度低,第二刻痕N附近的部分提前卷曲,形成障碍区域,然后第三粘接剂层17和第三基材18由宽度方向W对向两侧缘处向中间部分卷曲,受到障碍区域的影响,保证第三粘接剂层17与第一基材12的粘接面积;当受热温度继续升高时,第一发泡剂颗粒13发泡并推动第一粘接剂层11和第一基材12卷曲,卷曲至第三粘接剂层17和第三基材18的位置时受到阻碍,卷曲方向和卷曲程度得到控制。
在根据本发明的结构胶纸中,第二发泡剂颗粒19可为AC(偶氮二甲酰胺)发泡剂颗粒或OBSH(4,4-氧代双本磺酰肼)发泡剂颗粒。
在根据本发明的结构胶纸中,参照图12和图15,在一实施例中,第一粘接剂层11的厚度可为40μm。第一基材12的厚度可为40μm。第三粘接剂层17的厚度为可30μm。第三基材18的厚度可为15μm。第二刻痕N的深度为40μm。
在根据本发明的结构胶纸中,参照图17至图19,在一实施例中,第一发泡剂颗粒13分布于第一粘接剂层11的宽度方向W的对向两侧缘处,而 第一粘接剂层11的宽度方向W的中间部分无第一发泡剂颗粒13。当结构胶纸1受热时,第一发泡剂颗粒13发泡以使得结构胶纸1由宽度方向W的对向两侧缘向中间部分卷曲,有效地控制结构胶纸1的卷曲方向;而结构胶纸1的中间部分无第一发泡剂颗粒13而形成对已卷曲的部分的限制。
在根据本发明的结构胶纸中,参照图1至图4并结合图5至图19,被粘接对象为集流体2,在集流体2上涂布活性物质层3之前,将第一粘接剂层11粘贴于集流体2的形成极耳的预留区域21处,当在集流体2上涂布活性物质层3之后对活性物质层3进行烘干,而在结构胶纸1受热烘干时,第一发泡剂颗粒13发泡以使得第一基材12由宽度方向W的对向两侧缘向中间部分卷曲,以使第一粘接剂层11的两侧缘处的部分脱离集流体2并同时将预留区域21的周缘处的活性物质层3顶开,而第一粘接剂层11的中间部分保持与集流体2粘接不剥离;烘干完成后,剥离结构胶纸1,形成极耳的预留区域21。
结构胶纸1粘接于集流体2的形成极耳的预留区域21上,涂布、烘干后,去除结构胶纸1,从而形成极耳焊接的预留区域21;结构胶纸1受热烘干时,第一发泡剂颗粒13发泡以使得结构胶纸1由宽度方向W的对向两侧缘向中间部分卷曲,有效地控制结构胶纸1的卷曲方向,防止极片的外观破坏,保证采用极片的电化学装置的能量密度,提高活性物质的利用率,避免活性物质的浪费,同时,结构胶纸1的定向卷曲,有效降低剥离边缘的凸起,有效降低后序辊压工序时造成断带的可能性;而结构胶纸1的中间部分保持与集流体2粘接不剥离,能保证有效的粘接面积,防止结构胶纸1在烘干过程中从集流体上脱落并掉落在烘箱内造成烘箱的风口堵塞。
在这里补充说明的是,图5至图7、图8至图10、图11至图13、图14至图16以及图17至图19的五种具体的结构胶纸1均适用于形成极耳的预留区域21,当然不限于此,这些仅为具体实施例,本领域技术人员还可在本发明的技术构思内做出诸多变化。

Claims (18)

  1. 一种结构胶纸(1),包括:
    第一粘接剂层(11),用于粘接在被粘接对象上;以及
    第一基材(12),粘贴于第一粘接剂层(11)上;
    其特征在于,所述结构胶纸(1)还包括:
    第一发泡剂颗粒(13),分布于第一粘接剂层(11)内;
    其中,在结构胶纸(1)受热时,第一发泡剂颗粒(13)发泡以使得第一基材(12)由宽度方向(W)的对向两侧缘向中间部分卷曲,以使第一粘接剂层(11)的两侧缘处的部分脱离被粘接对象而第一粘接剂层(11)的中间部分保持与被粘接对象粘接不剥离。
  2. 根据权利要求1所述的结构胶纸(1),其特征在于,第一粘接剂层(11)为丙烯酸酯层。
  3. 根据权利要求1所述的结构胶纸(1),其特征在于,第一基材(12)为PET(聚对苯二甲酸类塑料)。
  4. 根据权利要求1所述的结构胶纸(1),其特征在于,第一发泡剂颗粒(13)为AC(偶氮二甲酰胺)发泡剂颗粒或OBSH(4,4-氧代双本磺酰肼)发泡剂颗粒。
  5. 根据权利要求1所述的结构胶纸(1),其特征在于,结构胶纸(1)为矩形。
  6. 根据权利要求1所述的结构胶纸(1),其特征在于,
    结构胶纸(1)的长度为22.5mm;
    结构胶纸(1)的宽度为11mm。
  7. 根据权利要求1所述的结构胶纸(1),其特征在于,所述结构胶纸(1) 还包括:
    第一刻痕(14),第一刻痕(14)平行于宽度方向(W)并沿厚度方向(T)切穿第一基材(12)并切入第一粘接剂层(11),且第一刻痕(14)的宽度小于结构胶纸(1)的宽度,第一刻痕(14)的深度小于第一粘接剂层(11)和第一基材(12)的厚度之和。
  8. 根据权利要求7所述的结构胶纸(1),第一刻痕(14)通过模切形成。
  9. 根据权利要求7所述的结构胶纸(1),其特征在于,
    第一粘接剂层(11)的厚度为45μm;
    第一基材(12)的厚度为15μm;
    第一刻痕(14)的深度为55μm。
  10. 根据权利要求1所述的结构胶纸(1),其特征在于,所述结构胶纸(1)还包括:
    第二粘接剂层(15),粘贴于第一基材(12)的沿宽度方向(W)的中间部分上,内部无发泡剂颗粒,第二粘接剂层(15)的长度与第一基材(12)的长度相同,第二粘接剂层(15)的宽度小于第一基材(12)的宽度;以及
    第二基材(16),粘贴于第二粘接剂层(15)上,第二基材(16)的长度与第一基材(12)的长度相同,第二基材(16)的宽度小于第一基材(12)的宽度且第二基材(16)的宽度等于第二粘接剂层(15)的宽度。
  11. 根据权利要求10所述的结构胶纸(1),其特征在于,第二粘接剂层(15)和第二基材(16)为矩形。
  12. 根据权利要求10所述的结构胶纸(1),其特征在于,
    第一粘接剂层(11)的厚度为35μm;
    第一基材(12)的厚度为25μm;
    第二粘接剂层(15)的厚度为5μm;
    第二基材(16)的厚度为36μm。
  13. 根据权利要求1所述的结构胶纸(1),其特征在于,所述结构胶纸(1)还包括:
    第三粘接剂层(17),粘贴于第一基材(12)上,第三粘接剂层(17)与第一基材(12)的形状相同;
    第三基材(18),粘贴于第一粘接剂层(11)上,第三基材(18)与第一基材(12)的形状相同;以及
    第二发泡剂颗粒(19),分布于第三粘接剂层(17)内,第二发泡剂颗粒(19)的发泡温度低于第一发泡剂颗粒(13)的发泡温度。
  14. 根据权利要求13所述的结构胶纸(1),其特征在于,所述结构胶纸(1)还包括:
    第二刻痕(N),第二刻痕(N)平行于宽度方向(W)并沿厚度方向(T)切穿第三基材(18)并切入第三粘接剂层(17),且第二刻痕(N)的宽度小于第三基材(18)的宽度,第二刻痕(N)的深度小于第三粘接剂层(17)和第三基材(18)的厚度之和。
  15. 根据权利要求13所述的结构胶纸(1),其特征在于,第二发泡剂颗粒(19)为AC(偶氮二甲酰胺)发泡剂颗粒或OBSH(4,4-氧代双本磺酰肼)发泡剂颗粒。
  16. 根据权利要求14所述的结构胶纸(1),其特征在于,
    第一粘接剂层(11)的厚度为40μm;
    第一基材(12)的厚度为40μm;
    第三粘接剂层(17)的厚度为30μm;
    第三基材(18)的厚度为15μm;
    第二刻痕(N)的深度为40μm。
  17. 根据权利要求1所述的结构胶纸(1),其特征在于,第一发泡剂颗粒(13)分布于第一粘接剂层(11)的宽度方向(W)的对向两侧缘处,而 第一粘接剂层(11)的宽度方向(W)的中间部分无第一发泡剂颗粒(13)。
  18. 根据权利要求1-17中任一项所述的结构胶纸(1),其特征在于,被粘接对象为集流体(2),在集流体(2)上涂布活性物质层(3)之前,将第一粘接剂层(11)粘贴于集流体(2)的形成极耳的预留区域(21)处,当在集流体(2)上涂布活性物质层(3)之后对活性物质层(3)的进行烘干,而在结构胶纸(1)受热烘干时,第一发泡剂颗粒(13)发泡以使得第一基材(12)由宽度方向(W)的对向两侧缘向中间部分卷曲,以使第一粘接剂层(11)的两侧缘处的部分脱离集流体(2)并同时将预留区域(21)的周缘处的活性物质层(3)顶开,而第一粘接剂层(11)的中间部分保持与集流体(2)粘接不剥离;烘干完成后,剥离结构胶纸(1),形成极耳的预留区域(21)。
PCT/CN2015/089490 2015-08-03 2015-09-14 结构胶纸 WO2017020399A1 (zh)

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