CN103021598A - overcurrent protection element - Google Patents

Abstract

The invention provides an overcurrent protection element which comprises a resistance element, an insulating layer, an electrode layer and at least one conductive connecting piece. The resistance element comprises a first electrode foil, a second electrode foil and a positive temperature coefficient material layer which is overlapped between the first electrode foil and the second electrode foil. The insulating layer is arranged on the surface of the first electrode foil. The electrode layer is arranged on the surface of the insulating layer. The conductive connecting member penetrates through the electrode layer, the insulating layer and the first electrode foil at least to electrically connect the electrode layer and the first electrode foil. The conductive connecting member is electrically isolated from the second electrode foil. One of the first electrode foil and the second electrode foil is used for electrically connecting the surface of a Protection Circuit Module (PCM), and the other one is used for electrically connecting the electrode terminals of the battery to be protected.

Description

Translated fromChinese

过电流保护元件overcurrent protection element

技术领域technical field

本发明涉及一种无源元件，尤其涉及一种过电流保护元件。The invention relates to a passive element, in particular to an overcurrent protection element.

背景技术Background technique

现有的正温度系数(Positive Temperature Coefficient；PTC)元件的电阻值对温度变化的反应相当敏锐。当PTC元件于正常使用状况时，其电阻可维持极低值而使电路得以正常运作。但是当发生过电流或过高温的现象而使温度上升至一临界温度时，其电阻值会瞬间弹跳至一高电阻状态(例如10⁴ohm以上)而将过量的电流反向抵销，以达到保护电池或电路元件的目的。The resistance value of the existing positive temperature coefficient (Positive Temperature Coefficient; PTC) element responds very sensitively to the temperature change. When the PTC element is in normal use, its resistance can maintain a very low value so that the circuit can operate normally. However, when the temperature rises to a critical temperature due to over-current or over-high temperature, its resistance value will instantly jump to a high resistance state (for example, above 10⁴ ohm) to counteract the excess current in reverse to achieve The purpose of protecting the battery or circuit components.

参照图1，美国专利US 6,713,210揭示一具过电流保护的电路板结构。一IC元件2设置于一保护电路模块(Protective Circuit Module；PCM)1上，一PTC元件3则以表面黏着方式固设于该PCM 1表面。该PTC元件3为一层叠结构，一PTC材料层6设置于镍箔(或镀镍铜箔)7、7′之间，该镍箔7、7′作为PTC材料层6的电极箔。一镍片4固接于该镍箔7的上表面作为外接电极之用。在镍箔7′的下表面(即相邻于PCM 1的表面)另焊接一铜电极5，相对于PTC元件3成一对称结构。Referring to FIG. 1 , US Patent No. 6,713,210 discloses a circuit board structure with overcurrent protection. AnIC element 2 is arranged on a protective circuit module (Protective Circuit Module; PCM) 1, and a PTC element 3 is fixed on the surface of the PCM 1 by surface adhesion. The PTC element 3 has a stacked structure, and a PTC material layer 6 is disposed between nickel foils (or nickel-plated copper foils) 7 , 7 ′, and the nickel foils 7 , 7 ′ serve as electrode foils of the PTC material layer 6 . A nickel sheet 4 is fixed on the upper surface of the nickel foil 7 as an external electrode. Another copper electrode 5 is welded on the lower surface of the nickel foil 7' (i.e., the surface adjacent to the PCM 1), forming a symmetrical structure with respect to the PTC element 3.

考量后续点焊(spot welding)时必须承受较大的电压、电流，该PTC元件3无法直接进行点焊，而需先行结合该镍片4，其厚度较佳地约需0.3mm以上，以避免后续点焊时破坏PTC元件的镍箔7、7′。然而该镍片4通常需要以人工的方式结合于该PTC元件，不利于大量制造及降低成本。Considering that subsequent spot welding (spot welding) must withstand a relatively large voltage and current, the PTC element 3 cannot be directly spot welded, but needs to be combined with the nickel sheet 4 first, and its thickness is preferably about 0.3mm or more, so as to avoid The nickel foils 7, 7' of the PTC element are destroyed during subsequent spot welding. However, the nickel sheet 4 usually needs to be manually combined with the PTC element, which is not conducive to mass production and cost reduction.

发明内容Contents of the invention

本发明的目的是提供一种过电流保护元件，可应用于电池的保护电路模块(PCM)。该过电流保护元件可利用表面黏着、回焊或点焊等方式进行与PCM或外接电极片的结合，而适于机械化大量制造，进而可有效减少制造时间及成本。The object of the present invention is to provide an overcurrent protection element, which can be applied to a protection circuit module (PCM) of a battery. The overcurrent protection element can be combined with the PCM or the external electrode sheet by means of surface adhesion, reflow welding or spot welding, and is suitable for mechanized mass production, thereby effectively reducing the manufacturing time and cost.

本发明一实施例的过电流保护元件包括电阻元件、绝缘层、电极层及至少一导电连接件。电阻元件包含一第一电极箔、一第二电极箔及叠设于该第一电极箔及第二电极箔之间的正温度系数材料层。绝缘层设于该第一电极箔表面。电极层设于该绝缘层的表面。导电连接件至少贯穿该电极层、绝缘层及第一电极箔，用以电气连接该电极层及第一电极箔。该导电连接件与第二电极箔电气隔离。该第一电极箔及第二电极箔中的一者用于电气连接PCM表面，另一者用于电气连接欲保护电池的电极端。An overcurrent protection element according to an embodiment of the present invention includes a resistance element, an insulating layer, an electrode layer, and at least one conductive connector. The resistance element comprises a first electrode foil, a second electrode foil and a positive temperature coefficient material layer laminated between the first electrode foil and the second electrode foil. The insulating layer is arranged on the surface of the first electrode foil. The electrode layer is arranged on the surface of the insulating layer. The conductive connector at least penetrates through the electrode layer, the insulating layer and the first electrode foil, and is used for electrically connecting the electrode layer and the first electrode foil. The conductive connection is electrically isolated from the second electrode foil. One of the first electrode foil and the second electrode foil is used for electrically connecting the surface of the PCM, and the other is used for electrically connecting the electrode terminal of the battery to be protected.

一实施例中，过电流保护元件另包含设于第二电极箔表面的焊垫，并于该焊垫区域以外的该第二电极箔表面设置防焊漆层(Solder Mask)。本实施例中，过电流保护元件可利用该焊垫焊接于PCM的表面。电极层可以回焊或点焊方式连接外接电极层。In one embodiment, the overcurrent protection element further includes a welding pad disposed on the surface of the second electrode foil, and a solder mask is provided on the surface of the second electrode foil outside the area of the welding pad. In this embodiment, the overcurrent protection element can be welded on the surface of the PCM by using the pad. The electrode layer can be connected to the external electrode layer by reflow or spot welding.

又一实施例中，过电流保护元件的电极层可利用表面黏着或回焊等方式连接于PCM表面。第二电极箔可为铜箔，而其表面可形成锡金属层，可利用回焊或点焊方式连接外接电极层。In yet another embodiment, the electrode layer of the overcurrent protection element can be connected to the surface of the PCM by means of surface adhesion or reflow. The second electrode foil can be copper foil, and a tin metal layer can be formed on its surface, and the external electrode layer can be connected by reflow or spot welding.

本发明的过电流保护元件，可应用于电池的保护电路模块(PCM)。该过电流保护元件可利用表面黏着、回焊或点焊等方式进行与PCM或外接电极片的结合，而适于机械化大量制造，进而可有效减少制造时间及成本。The overcurrent protection element of the present invention can be applied to a protection circuit module (PCM) of a battery. The overcurrent protection element can be combined with the PCM or the external electrode sheet by means of surface adhesion, reflow welding or spot welding, and is suitable for mechanized mass production, thereby effectively reducing the manufacturing time and cost.

附图说明Description of drawings

图1为现有的PTC元件于PCM上的应用示意图。FIG. 1 is a schematic diagram of an existing PTC element applied to a PCM.

图2A至2C为本发明第一实施例的过电流保护元件示意图。2A to 2C are schematic diagrams of an overcurrent protection device according to a first embodiment of the present invention.

图3A至3C为本发明第二实施例的过电流保护元件示意图。3A to 3C are schematic diagrams of an overcurrent protection device according to a second embodiment of the present invention.

图4A至4B为本发明第三实施例的过电流保护元件示意图。4A to 4B are schematic diagrams of an overcurrent protection element according to a third embodiment of the present invention.

图5A至5B为本发明第四实施例的过电流保护元件示意图。5A to 5B are schematic diagrams of an overcurrent protection element according to a fourth embodiment of the present invention.

图6A至6C为本发明的过电流保护元件的应用示意图。6A to 6C are application diagrams of the overcurrent protection device of the present invention.

其中，附图标记说明如下：Wherein, the reference signs are explained as follows:

1  保护电路模块1 Protection circuit module

2  IC元件2 IC components

3  PTC元件3 PTC components

4  镍片4 Nickel sheets

5  铜电极5 copper electrodes

6  PTC材料层6 PTC material layer

7、7’  镍箔7. 7' nickel foil

10、30、40、50  过电流保护元件10, 30, 40, 50 overcurrent protection element

11  电阻元件11 resistance element

12  第一电极箔12 First electrode foil

13  正温度系数材料层13 positive temperature coefficient material layer

14  第二电极箔14 Second electrode foil

15  绝缘层15 insulation layer

16  电极层16 electrode layer

17  防焊漆层17 Solder resist paint layer

18  导电通孔18 Conductive vias

19、29  导电连接件19, 29 Conductive connectors

20  焊垫20 pads

25  半圆导电孔25 semicircular conductive holes

41  填孔胶41 Filler

42、45  锡金属层42, 45 Tin metal layer

43、44  防焊漆层43, 44 Solder resist paint layer

60  PCM60 PCM

61  外接电极片61 external electrodes

具体实施方式Detailed ways

图2A至2C为本发明第一实施例的过电流保护元件的示意图。图2A为过电流保护元件10的立体结构，图2B为图2A中沿1-1剖面线的剖面示意图。图2C为过电流保护元件10的底部视图。过电流保护元件10主要包括电阻元件11、绝缘层15、电极层16及导电连接件19。电阻元件11包括第一电极箔12、第二电极箔14及叠设于第一电极箔12及第二电极箔14之间的正温度系数材料层13。绝缘层15设于第一电极箔12表面，且电极层16设于绝缘层15的表面，其中电阻元件11、绝缘层15及电极层16形成层叠结构。2A to 2C are schematic diagrams of an overcurrent protection device according to a first embodiment of the present invention. FIG. 2A is a three-dimensional structure of theovercurrent protection device 10 , and FIG. 2B is a schematic cross-sectional view along line 1 - 1 in FIG. 2A . FIG. 2C is a bottom view of theovercurrent protection device 10 . Theovercurrent protection element 10 mainly includes aresistor element 11 , an insulatinglayer 15 , anelectrode layer 16 and aconductive connector 19 . Theresistor element 11 includes afirst electrode foil 12 , asecond electrode foil 14 and a positive temperaturecoefficient material layer 13 stacked between thefirst electrode foil 12 and thesecond electrode foil 14 . The insulatinglayer 15 is disposed on the surface of thefirst electrode foil 12 , and theelectrode layer 16 is disposed on the surface of the insulatinglayer 15 , wherein theresistance element 11 , the insulatinglayer 15 and theelectrode layer 16 form a laminated structure.

导电连接件19至少贯穿电极层16、绝缘层15及第一电极箔12，用以电气连接电极层16及第一电极箔12。需注意的是，导电连接件19与第二电极箔14为电气隔离。Theconductive connector 19 at least penetrates through theelectrode layer 16 , the insulatinglayer 15 and thefirst electrode foil 12 for electrically connecting theelectrode layer 16 and thefirst electrode foil 12 . It should be noted that theconductive connector 19 is electrically isolated from thesecond electrode foil 14 .

本实施例中，导电连接件19为表面镀有导电层的导电通道18。进一步言之，本实施例的导电通道18为贯穿过电流保护元件10中央处的导电孔。In this embodiment, theconductive connector 19 is aconductive channel 18 whose surface is plated with a conductive layer. In other words, theconductive channel 18 in this embodiment is a conductive hole penetrating through the center of theovercurrent protection element 10 .

实际应用时，第二电极箔14可利用表面黏着(Surface Mounting)方式固定于PCM表面，电极层16可以电镀增厚方式或选用厚度大于50μm的较厚铜箔以点焊的方式结合外接电极片(图未示)，或于电极层16表面另设置金属电极(图未示)作为后续制作过程使用。另一实施例中，为求更佳的结合品质及便利性，过电流保护元件10的底面可另设置于第二电极箔14表面的焊垫20，且将焊垫20区域以外的第二电极箔14表面涂布绝缘防焊漆层17。本实施例中，焊垫20分置于导电连接件19两侧。较佳地，焊垫20的厚度等同或略大于防焊漆层17的厚度，因而焊垫20可等同或略凸出于防焊漆层17的表面。基此，可利用焊垫20作为焊接介面，而将过电流保护元件10固设于PCM表面。In actual application, thesecond electrode foil 14 can be fixed on the surface of the PCM by means of surface mounting, and theelectrode layer 16 can be electroplated to thicken or select a thicker copper foil with a thickness greater than 50 μm to combine with the external electrode sheet by spot welding (not shown in the figure), or another metal electrode (not shown in the figure) is provided on the surface of theelectrode layer 16 for use in a subsequent manufacturing process. In another embodiment, in order to achieve better bonding quality and convenience, the bottom surface of theovercurrent protection element 10 can be additionally arranged on thepad 20 on the surface of thesecond electrode foil 14, and the second electrode outside the area of thepad 20 The surface of thefoil 14 is coated with an insulating solder resistpaint layer 17 . In this embodiment, thewelding pads 20 are located on two sides of the conductive connectingmember 19 . Preferably, the thickness of thesolder pad 20 is equal to or slightly greater than that of the solder resistpaint layer 17 , so thesolder pad 20 can be equal to or slightly protrude from the surface of the solder resistpaint layer 17 . Based on this, theovercurrent protection device 10 can be fixed on the surface of the PCM by using thepad 20 as a soldering interface.

一实施例中，电极层16可选用铜箔、镍箔或其他金属箔，作为回焊或点焊用。前述铜箔亦可于表面镀镍，以防氧化。另外，电极层16亦可选用镀锡铜箔作为后续于表面另设置金属电极之用。焊垫20的材料可选用锡或其他金属。绝缘层15可选用聚丙烯、玻璃纤维或环氧树脂等。In one embodiment, theelectrode layer 16 can be made of copper foil, nickel foil or other metal foils for reflow or spot welding. The aforementioned copper foil can also be plated with nickel on the surface to prevent oxidation. In addition, theelectrode layer 16 can also be made of tinned copper foil for the purpose of further disposing metal electrodes on the surface. The material of thepad 20 can be tin or other metals. The insulatinglayer 15 can be selected polypropylene, glass fiber or epoxy resin etc. for use.

图3A至3C为本发明第二实施例的过电流保护元件的示意图。图3A为过电流保护元件30的立体结构，图3B为图3A中沿2-2剖面线的剖面示意图。图3C为过电流保护元件30的底部视图。过电流保护元件30的基本结构与第一实施例的过电流保护元件10大致相同，不同处在于：导电通孔18以过电流保护元件30两侧面的半圆导电孔25替代。半圆导电孔25的表面可镀上导电层以形成导电连接件29。导电连接件29至少贯穿电极层16、绝缘层15及第一电极箔12，用以电气连接电极层16及第一电极箔12。需注意的是，导电连接件29与第二电极箔14为电气隔离。3A to 3C are schematic diagrams of an overcurrent protection device according to a second embodiment of the present invention. FIG. 3A is a three-dimensional structure of theovercurrent protection element 30 , and FIG. 3B is a schematic cross-sectional view along line 2 - 2 in FIG. 3A . FIG. 3C is a bottom view of theovercurrent protection element 30 . The basic structure of theovercurrent protection element 30 is substantially the same as that of theovercurrent protection element 10 in the first embodiment, except that theconductive vias 18 are replaced by semicircularconductive holes 25 on both sides of theovercurrent protection element 30 . The surface of the semicircularconductive hole 25 can be plated with a conductive layer to form aconductive connection 29 . The conductive connectingmember 29 at least penetrates through theelectrode layer 16 , the insulatinglayer 15 and thefirst electrode foil 12 for electrically connecting theelectrode layer 16 and thefirst electrode foil 12 . It should be noted that the conductive connectingmember 29 is electrically isolated from thesecond electrode foil 14 .

上述的导电连接件19、29亦可采用多个或其他型式，而提供等同功效。The above-mentionedconductive connectors 19, 29 may also adopt multiple or other types to provide equivalent functions.

图4A至图4B为本发明第三实施例的过电流保护元件40的示意图。相较于图2A至2C所示的过电流保护元件10的利用电极层16结合外接电极片，且利用焊垫20连接PCM表面，过电流保护元件40类似将元件倒置，利用电极层16以表面黏着或回焊方式连接于PCM表面，而第二电极箔14一般可为铜箔，并可于表面镀锡金属层42，并且利用防焊漆层43(设于元件中央的导电连接件19一端)进行导电连接件19与第二电极箔14及锡金属层42间的电气隔离。锡金属层42可连接外接电极片(图未示)，其可连接至电池的电极端。实际上，第二电极箔14和锡金属层42的组合的作用即相当于电极层16，而得以单一铜箔、镍箔、镀镍铜箔或其他金属箔替代。另外，导电连接件19间的空孔可填入绝缘填孔胶41。4A to 4B are schematic diagrams of anovercurrent protection device 40 according to a third embodiment of the present invention. Compared with theovercurrent protection element 10 shown in FIGS. 2A to 2C , which uses theelectrode layer 16 to connect the external electrode pads, and uses thepad 20 to connect the surface of the PCM, theovercurrent protection element 40 is similar to turning the element upside down, and uses theelectrode layer 16 to form the surface Adhesive or reflow method is connected to the surface of PCM, and thesecond electrode foil 14 can generally be copper foil, and can be tinnedmetal layer 42 on the surface, and utilize solder resist varnish layer 43 (set at one end of theconductive connector 19 in the center of the component) ) to electrically isolate theconductive connector 19 from thesecond electrode foil 14 and thetin metal layer 42 . Thetin metal layer 42 can be connected to an external electrode pad (not shown), which can be connected to an electrode terminal of the battery. Actually, the function of the combination of thesecond electrode foil 14 and thetin metal layer 42 is equivalent to theelectrode layer 16, and can be replaced by a single copper foil, nickel foil, nickel-plated copper foil or other metal foils. In addition, the holes between theconductive connectors 19 can be filled with insulating hole-fillingcompound 41 .

图5A至5B为本发明第四实施例的过电流保护元件50的示意图。相较于图3A至3C所示的过电流保护元件30的利用电极层16结合外接电极片，且利用焊垫20连接PCM表面，过电流保护元件50类似将元件倒置，利用电极层16以表面黏着或回焊方式连接于PCM表面，而第二电极箔14一般可为铜箔，且本实施例是于第二电极箔14表面镀锡金属层45，并且利用防焊漆层44进行导电连接件29与第二电极箔14及锡金属层45间的电气隔离。锡金属层45可以回焊或点焊方式连接外接电极片(图未示)，其可连接至电池的电极端。5A to 5B are schematic diagrams of anovercurrent protection device 50 according to a fourth embodiment of the present invention. Compared with theovercurrent protection element 30 shown in FIGS. 3A to 3C , which uses theelectrode layer 16 to connect the external electrode pads, and uses thepad 20 to connect to the surface of the PCM, theovercurrent protection element 50 is similar to turning the element upside down, and uses theelectrode layer 16 to connect the surface Thesecond electrode foil 14 can generally be copper foil, and in this embodiment, atinned metal layer 45 is plated on the surface of thesecond electrode foil 14, and a solder resistpaint layer 44 is used for conductive connection. Electrical isolation between theelement 29 and thesecond electrode foil 14 and thetin metal layer 45 . Thetin metal layer 45 can be connected to an external electrode sheet (not shown) by reflow or spot welding, which can be connected to an electrode terminal of the battery.

图5A及5B的半圆导电连接件29设置于元件两侧，其亦可设置于元件四个角落(1/4圆导电连接件)，亦即可采用多个或其他型式的导电连接件，而提供等同功效。The semicircularconductive connector 29 of Figures 5A and 5B is arranged on both sides of the element, and it can also be arranged on the four corners of the element (1/4 round conductive connector), that is, multiple or other types of conductive connectors can be used, and provide equivalent functionality.

按前述实施例的设计，过电流保护元件10、30、40及50一面固定于PCM上，另一面则可连接外接电极片。参照图6A，以过电流保护元件40为例(可以元件10、30、50替代)，其固定于PCM 60上，另一端则连接外接电极片61。该外接电极片61一般可为镍片或其他金属片，可连接锂离子或锂高分子电池等二次电池的电极端。外接电极片61可以用回焊或点焊方式与过电流保护元件40或电池的电极结合。According to the designs of the aforementioned embodiments, one side of theovercurrent protection elements 10 , 30 , 40 and 50 is fixed on the PCM, and the other side can be connected to an external electrode. Referring to FIG. 6A, taking theovercurrent protection element 40 as an example (it can be replaced byelements 10, 30, and 50), it is fixed on thePCM 60, and the other end is connected to anexternal electrode sheet 61. Theexternal electrode sheet 61 can generally be a nickel sheet or other metal sheet, and can be connected to an electrode terminal of a secondary battery such as a lithium ion battery or a lithium polymer battery. Theexternal electrode sheet 61 can be combined with theovercurrent protection element 40 or the electrode of the battery by reflow or spot welding.

图6A的外接电极片61为长条形，其亦可顺应电池的设计而为各种其它形状，例如图6B的L型，或图6C的弯曲状，以方便连接到电池的电极端。Theexternal electrode sheet 61 in FIG. 6A is long, and it can also be in various other shapes according to the design of the battery, such as the L shape in FIG. 6B , or the curved shape in FIG. 6C , so as to facilitate connection to the electrode terminals of the battery.

传统的PTC元件因无法直接利用点焊与镍片或其他金属片结合，而需以锡膏回焊的方式进行结合，而回焊(reflow)温度常需大于230℃，而恐将影响PTC元件的回复性质。本发明的过电流保护元件焊接外接电极时因可利用点焊，其仅需考虑元件所含的热固性塑胶的固化(curing)温度，其通常小于200℃，而不致于影响PTC元件的回复性质。Traditional PTC components cannot be directly combined with nickel sheets or other metal sheets by spot welding, but need to be combined by solder paste reflow, and the reflow temperature often needs to be higher than 230°C, which may affect PTC components nature of the reply. The overcurrent protection element of the present invention can use spot welding when welding the external electrodes, and it only needs to consider the curing temperature of the thermosetting plastic contained in the element, which is usually less than 200° C., so as not to affect the recovery properties of the PTC element.

本发明的技术内容及技术特点已揭示如上，然而本领域技术人员仍可能基于本发明的教示及揭示而作种种不背离本发明精神的替换及修饰。因此，本发明的保护范围应不限于实施例所揭示的内容，而应包括各种不背离本发明的替换及修饰，并为以下的权利要求范围所涵盖。The technical content and technical features of the present invention have been disclosed above, but those skilled in the art may still make various substitutions and modifications based on the teaching and disclosure of the present invention without departing from the spirit of the present invention. Therefore, the protection scope of the present invention should not be limited to the contents disclosed in the embodiments, but should include various replacements and modifications that do not depart from the present invention, and are covered by the scope of the following claims.

Claims (18)

1. an over-current protecting element is applied to a protective circuit module, it is characterized in that, comprising:

One resistive element comprises one first electrode foil, one second electrode foil and is stacked at PTC material layer between this first electrode foil and the second electrode foil;

One insulating barrier is located at this first electrode foil surface;

One electrode layer is located at the surface of this insulating barrier; And

At least one conducting connecting part runs through this electrode layer, this insulating barrier and this first electrode foil at least, in order to being electrically connected this electrode layer and this first electrode foil, and this conducting connecting part and this second electrode foil electrical isolation;

Wherein the one in this first electrode foil and the second electrode foil is used for this protective circuit Modular surface of electrical connection, and another one is used for the electrode tip of electrical connection battery.

2. according to claim 1 over-current protecting element is characterized in that this second electrode foil is welded in the interface of this protective circuit Modular surface as this over-current protecting element.

3. according to claim 1 over-current protecting element is characterized in that, this conducting connecting part is coated with the conductive channel of conductive layer for the surface.

4. according to claim 1 over-current protecting element is characterized in that this conducting connecting part runs through the conductive hole of this over-current protecting element.

5. according to claim 1 over-current protecting element is characterized in that this conducting connecting part is located at the semicircle conductive hole of this over-current protecting element side.

6. according to claim 1 over-current protecting element is characterized in that, also comprises the weld pad of being located at this second electrode foil surface, is welded in the interface of this protective circuit Modular surface as this over-current protecting element.

7. according to claim 6 over-current protecting element is characterized in that, this weld pad conducting connecting part both sides that are placed in.

8. according to claim 6 over-current protecting element is characterized in that, also comprises anti-welding enamelled coating, is located at this second electrode foil surface beyond this weld pad zone.

9. according to claim 8 over-current protecting element is characterized in that this weld pad is equal to or protrudes from the surface of anti-welding enamelled coating.

10. according to claim 1 over-current protecting element is characterized in that this over-current protecting element is to utilize this second electrode foil to be fixed in the surface of this protective circuit module in the surface mount mode.

11. over-current protecting element according to claim 1 is characterized in that, also comprises the anti-welding enamelled coating of being located at this conducting connecting part one end, is used for this second electrode foil of electrical isolation and this conducting connecting part.

12. over-current protecting element according to claim 11 is characterized in that, this anti-welding enamelled coating is positioned at central authorities or the both sides of this over-current protecting element.

13. over-current protecting element according to claim 1 is characterized in that, also comprises the tin metal layer of being located at this second electrode foil surface, is used for connecting the usefulness of external electrode sheet.

14. over-current protecting element according to claim 13 is characterized in that, this external electrode sheet is to utilize reflow or spot welding mode to be connected in this tin metal layer.

15. over-current protecting element according to claim 1 is characterized in that, this over-current protecting element is to utilize this electrode layer to be fixed in the surface of this protective circuit module with surface mount or reflow mode.

16. over-current protecting element according to claim 1 is characterized in that, also comprises an external electrode sheet, is electrically connected this first electrode foil or this second electrode foil, and is electrically connected in this electrode tip of this battery.

17. over-current protecting element according to claim 16 is characterized in that, this external electrode sheet is connected in this electrode layer with reflow or spot welding mode.

18. over-current protecting element according to claim 16 is characterized in that, this external electrode sheet be shaped as strip, Curved or L shaped.

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