WO2019184311A1 - 一种双极性极板板栅 - Google Patents

一种双极性极板板栅 Download PDF

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Publication number
WO2019184311A1
WO2019184311A1 PCT/CN2018/110987 CN2018110987W WO2019184311A1 WO 2019184311 A1 WO2019184311 A1 WO 2019184311A1 CN 2018110987 W CN2018110987 W CN 2018110987W WO 2019184311 A1 WO2019184311 A1 WO 2019184311A1
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Prior art keywords
insulating substrate
bipolar plate
lead strip
lead
insulating
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PCT/CN2018/110987
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English (en)
French (fr)
Inventor
李桂发
赵海敏
郭志刚
崔海涛
刘玉
邓成智
柏丽莉
陈强
丁伯芬
田庆山
李丹
施璐
宋文龙
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天能电池集团有限公司
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Publication of WO2019184311A1 publication Critical patent/WO2019184311A1/zh

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H01M4/70—Carriers or collectors characterised by shape or form
    • H01M4/72—Grids
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H01M4/70—Carriers or collectors characterised by shape or form
    • H01M4/72—Grids
    • H01M4/73—Grids for lead-acid accumulators, e.g. frame plates
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H01M4/66—Selection of materials
    • H01M4/668—Composites of electroconductive material and synthetic resins
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H01M4/66—Selection of materials
    • H01M4/68—Selection of materials for use in lead-acid accumulators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
    • H01M2004/029—Bipolar electrodes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the invention belongs to the technical field of batteries, and in particular relates to a bipolar plate grid.
  • bipolar batteries have advantages over conventional batteries in terms of power output.
  • conventional batteries the current generated by the active material passes through an external circuit to the next cell.
  • bipolar structure both positive and negative active materials are placed on both surfaces of the bipolar substrate. Current can flow through the substrate to the next cell. Due to the short circuit, the power loss due to the ohmic voltage drop in the circuit is reduced. The volume of the battery is reduced by eliminating external circuit materials such as bridges, butt weldments, and bus bars.
  • a bipolar battery is a battery that has obvious advantages (high specific energy ratio) and has obvious structural disadvantages (corrosion of seal and base material and shedding of active material). The life of the battery is its soft rib and structural defects. (Sealing problems) are often more difficult to overcome than performance defects.
  • the role of the substrate is of the utmost importance.
  • the role of the substrate is the isolation between the cells, the support of the active material and the conduction of current. It provides a sealed, isolated electrolyte in a single cell that must remain conductive in a corrosive lead-acid environment and prevent electrolyte cross-linking during the life of the battery.
  • the conductive substrate must be electrically conductive, insoluble in sulfuric acid, stable battery voltage window, high oxygen evolution, hydrogen potential, do not participate in battery reaction, do not penetrate the electrolyte, and have good adhesion with active materials. Easy to handle and seal the battery case.
  • the Chinese utility model patent with the authorization bulletin number CN204045671U discloses a bipolar plate for lead-acid batteries, including a carbon-based bipolar plate, a battery coating layer, a glass fiber layer, a non-metallic metal strip and a lower non-metal.
  • a strip a recessed area recessed inwardly on the positive and negative pole faces of the carbon-based bipolar plate, and two or more "ten"-shaped bosses in the recessed area, and two upper and lower “ten” shaped
  • the studs are staggered; the battery paste layer is coated in the recessed area; the fiberglass layer is attached to the positive and negative pole faces of the carbon-based bipolar plate and covers the battery paste layer; the upper non-metallic strip is stuck in the
  • the upper end of the carbon-based bipolar plate and the glass fiber layer is provided with a liquid injection hole on the upper non-metal strip, and the upper end of the liquid injection hole can communicate with the outside, and the lower end of the liquid injection hole and the carbon-based bipolar plate and the glass fiber layer The upper end is connected; the lower non-metallic strip is attached to the lower end of the carbon-based bipolar plate and the fiberglass layer.
  • the Chinese invention patent publication CN103985878A discloses a bipolar grid of a lead-acid battery and a manufacturing method thereof, which overcomes the acid resistance of the base material by hot pressing the titania material and the lead alloy material on both sides of the conductive plastic sheet. Poor rot, poor adhesion of matrix materials and active materials, and poor resistance to acid penetration of matrix materials.
  • the invention provides a bipolar plate grid in view of the deficiencies in the prior art, and overcomes the problems of high cost, difficult sealing and poor active material bonding in the bipolar plate in the prior art. .
  • a bipolar plate grid comprising an insulating substrate and a lead strip extending through the insulating substrate for electrically conducting the active materials on both sides, the edge of the insulating substrate having a through hole through which the lead strip passes, the insulating substrate
  • the two sides are provided with a heat sealing film for sealing the through hole, the middle portion of the heat sealing film has an opening for at least partially exposing the lead strip to contact the active material, and the outer side of the heat sealing film is provided with a through hole for covering the hidden insulating substrate
  • a bipolar plate grid refers to a grid used to make bipolar plates.
  • the substrate material in the prior art needs to simultaneously conduct electricity and support and adhere to the active material, it is required to simultaneously satisfy various performance requirements such as acid resistance, corrosion resistance, electrical conductivity, binding with an active material, and acid permeation resistance, so that In some respects, the performance is poor, or the performance is balanced in all aspects but the cost is high.
  • the performance requirements of the bipolar plate grid are decomposed, and the lead strip acts on the one hand to attach the active material, and on the other hand, acts as a confluence, and the insulating substrate acts as a support, and at the same time
  • the heat sealing film seals the through holes on the insulating substrate through which the lead strips pass, so that the parts only need to meet the requirements of the materials of the respective parts to achieve the comprehensive performance of the grid.
  • the lead strip has a C-shaped structure, and both ends pass through the through hole and abut against one side surface of the insulating substrate, and the middle portion abuts against the other side surface of the insulating substrate.
  • one end of a straight lead strip is passed through a through hole in the insulating substrate, then bent, and the other end is passed through the corresponding through hole, and then the section is also bent, and finally Both ends of the through hole are bent until they abut against one side surface of the insulating substrate.
  • a row of lead strips can be bent at the same time to increase efficiency.
  • each lead strip is close to each other. This avoids large gaps between the ends and affects the performance of the bipolar plates there.
  • Two layers of lead strips are disposed on each side of the insulating substrate, and the two layers of lead strips are vertically staggered. It is possible to use only one layer of lead strips or two layers of lead strips. When two layers are used, the size of the lead strips can be appropriately reduced, and the cross-hatched strips are advantageous for enhancing the adhesion to the active material. Of course, when two layers of lead strips are required, corresponding two sets of through holes are required at corresponding positions of the insulating substrate, and the sealing requirement is improved compared with a lead strip.
  • the heat sealing film comprises an annular frame and a plurality of strips arranged in parallel in the middle, the annular frame covering the through holes, the bead being stacked on the lead strip, and the opening is formed between adjacent beads.
  • the annular frame of the heat sealing film seals the through hole, and the bead can press the lead strip on the insulating substrate to prevent the lead strip from swaying relative to the insulating substrate during use, causing the active material to fall off and the through hole to be sealed. Not strict.
  • the bead is arranged obliquely to form an angle with the lead strip.
  • the heat sealing films on both sides of the insulating substrate are bonded to each other at the through holes.
  • the heat sealing films on both sides are bonded to each other at the through hole to ensure the sealing effect and avoid acid leakage or acid migration at the through holes.
  • the cross section of the lead strip is a trapezoidal structure with a narrow inner width and an outer width.
  • the inner narrow outer width means that the side that abuts the insulating substrate has a shorter trapezoidal upper bottom and the outer side has a longer bottomed body.
  • the inner ring edge of the insulating frame has an inclined chamfer, and the chamfer has a gap between the insulating substrate.
  • the structure is also the same as the trapezoidal structure in which the cross section of the lead strip is narrow inside and outside, and the support material has an inner side support, which can effectively prevent the active material from falling off.
  • the insulating substrate, the heat sealing film and the insulating frame are all prepared by heat-sealable insulating rigid plastic and fixed by heat sealing.
  • Materials which can be used are ABS plastic (acrylonitrile butadiene styrene plastic), PC plastic PC (polycarbonate) or PP plastic PP (polypropylene).
  • the through holes at the same end of the insulating substrate are connected to form a slot, and the side wall of the slot is provided with a limiting through slot corresponding to the lead strip. This can reduce the difficulty of bending the lead strip through the insulating substrate, and at the same time, when the heat seal film is heat-sealed, the slot can be sealed as a whole, and the sealing effect is better with respect to the respective independent through holes.
  • the grid of the invention is used for fabricating a bipolar plate, and the lead strip is decomposed by the function to be satisfied by the bipolar plate grid, and the lead strip acts as an active substance on the one hand, and also acts as a confluence on the other hand.
  • the insulating substrate acts as a support, and at the same time, the heat-sealing film seals the through-holes on the insulating substrate through which the lead strip passes, so that each part only needs to meet the requirements of the materials of the respective parts to achieve the comprehensive performance.
  • Good grid Since the material requirements are lowered, the cost can be reduced, and the sealing property and the ability to bond with the active material are effectively improved.
  • Figure 1 is an exploded view of the grid of the present invention.
  • FIG. 2 is a schematic structural view of an insulating substrate.
  • FIG. 3 is a schematic structural view of a grid of the present invention.
  • FIG. 4 is a schematic structural view of the A-A direction of FIG. 3.
  • Figure 5 is a partial enlarged view of B in Figure 4.
  • Figure 6 is a schematic view showing the structure in the C-C direction of Figure 3.
  • Figure 7 is a partial enlarged view of D in Figure 6.
  • Figure 8 is an exploded view of the two-layer lead strip of the grid of the present invention.
  • Fig. 9 is a schematic view showing the assembly structure of a lead strip and an insulating substrate when two layers of lead strips are used.
  • a bipolar plate grid includes an insulating substrate 1 and a lead strip 2 extending through the insulating substrate 1 for electrically conducting the active materials on both sides.
  • the edge of the insulating substrate 1 has a lead strip. 2 through the through hole, the heat insulating film 3 is provided on both sides of the insulating substrate 1 with a sealing through hole, and the middle portion of the heat sealing film 3 has an opening 33 for at least partially exposed the lead strip 2 to contact the active material, and the outside of the heat sealing film 3
  • An insulating frame 4 covering the area where the through hole of the insulating substrate 1 is hidden is provided, and the insulating frame 4 surrounds the cavity 41 for containing the active material.
  • the through holes at the same end of the insulating substrate 1 are connected to form the slot 11 , and the sidewall of the slot 11 is provided with a limiting slot 12 corresponding to the lead strip 2 , and the limiting slot 12 is opposite.
  • the lead strip 2 is inserted into the limiting through slot 12 to be fixed and fixed to prevent the lead strip 2 from being strung, thereby reducing the bending of the lead strip 2
  • the difficulty of passing through the insulating substrate 1 and the heat sealing of the heat sealing film 3 can seal the slot 11 as a whole, and the sealing effect is better with respect to the respective independent through holes.
  • the lead strip 2 has a C-type structure, and both ends pass through the through hole and abut against one side surface of the insulating substrate 1, and the intermediate portion abuts against the other side surface of the insulating substrate 1.
  • one end of a straight lead strip 2 is first passed through a through hole in the insulating substrate 1, and then bent, and the other end is passed through the corresponding through hole, and the section is also bent. Finally, both ends of the through hole are bent until they abut against one side surface of the insulating substrate 1.
  • a row of lead strips 2 can be bent at the same time to increase efficiency.
  • the two ends of each lead strip 2 are close to each other. This avoids large gaps between the ends and affects the performance of the bipolar plates there.
  • the heat sealing film 3 includes an annular frame 31 and a plurality of laminations 32 arranged in parallel in the middle.
  • the annular frame 31 covers the through holes in the insulating substrate 1.
  • the bead 32 is stacked on the lead strip 2, and an opening 33 is formed between the adjacent bead 32.
  • the annular frame 31 of the heat sealing film 3 seals the through holes, and the bead 32 can press the lead strip 2 on the insulating substrate 1 to prevent the lead strip 2 from being shaken relative to the insulating substrate 1 during use.
  • the material is detached and the sealing at the through hole is not strict.
  • the bead 32 is disposed obliquely to form an angle with the lead strip 2.
  • the heat sealing films 3 on both sides of the insulating substrate 1 are bonded to each other at the through holes, and the heat sealing films 3 on both sides are bonded to each other at the through holes, thereby ensuring the sealing effect and avoiding Acid leakage or acid climbing occurs at the through hole.
  • the cross section of the lead strip 2 is a trapezoidal structure having a narrow inner width and an outer width.
  • the inner narrow outer width means that the one side of the insulating substrate 1 has a shorter trapezoidal upper base and the outer side has a longer bottom structure of the body structure, so that the active material of the trapezoidal structure can be made to the waist.
  • the support facing the inside can effectively prevent the active material from falling off.
  • the inner ring edge of the insulating bezel 4 has a slanted chamfer 42 with a gap 43 between the chamfer 42 and the insulating substrate 1.
  • the structure is also the same as the trapezoidal structure in which the cross section of the lead strip is narrow inside and outside, and the support material has an inner side support, which can effectively prevent the active material from falling off.
  • the insulating substrate 1, the heat sealing film 3 and the insulating frame 4 are all prepared by heat-sealable insulating rigid plastic, and are fixed by heat sealing with each other.
  • the material which can be used is ABS plastic (acrylonitrile-butadiene-styrene plastic). , PC plastic PC (polycarbonate) or PP plastic PP (polypropylene).
  • each side of the insulating substrate 1 is provided with two layers of lead strips 2, and the two layers of lead strips 2 are vertically staggered. It is possible to use only one layer of lead strip 2 or two layers of lead strip 2, and when two layers are used, the size of the lead strip 2 can be appropriately reduced, and the cross-hatched lead strip 2 is advantageous for enhancing adhesion with the active material. ability. Of course, when two layers of lead strips 2 are required, corresponding two sets of through holes are required at corresponding positions of the insulating substrate 1, and the sealing requirement is improved compared with a lead strip.
  • the lead strip 2 is first assembled with the insulating substrate 1, and the lead strip 2 needs to be bent during assembly. After the lead strip 2 and the insulating substrate 1 are assembled, the two layers of the heat sealing film 3 and the lead strip 2 are assembled. The insulating substrate 1 is sequentially laminated and then heat-sealed for a first time to obtain a semi-finished product. Then, the semi-finished product and the two insulating frames 4 are sequentially laminated and then subjected to a second heat sealing. After the heat sealing is completed, the grid of the present invention is obtained.

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Abstract

本发明公开了一种双极性极板板栅，包括绝缘基板以及贯穿绝缘基板用于将两侧活性物质电导通的铅条，所述绝缘基板的边缘具有供铅条穿过的通孔，所述绝缘基板两侧表面设置有密封所述通孔的热封膜，所述热封膜的中部具有让铅条至少部分裸露接触活性物质的开口，所述热封膜外侧设置有覆盖隐藏绝缘基板通孔所在区域的绝缘边框，所述绝缘边框围成容纳活性材料的腔体。本发明板栅通过将双极性极板板栅所需要满足的功能进行分解，铅条、绝缘基板和热封膜各自发挥功能，从而各部分仅需要满足各自所承担部分的功能对材料的要求即可达到综合性能好的板栅。由于对材料的要求降低，所以可以降低成本，同时密封性及与活性物质的结合能力等都得到有效提高。

Description

一种双极性极板板栅 技术领域
本发明属于蓄电池技术领域，特别是涉及一种双极性极板板栅。
背景技术
铅蓄电池至今已有150余年的历史，且应用领域非常广泛。众所周知，在功率输出方面，双极性电池比传统电池更有优势。在传统电池中，由活性物质产生的电流通过外部电路到达下一个单格电池。在双极性结构中，正、负极性的活性物质均被放置在双极基板的两个表面上。电流可以通过基板流向下一个单格电池。由于线路较短，电路中的欧姆压降导致的功率损失减小。电池的体积由于消除了诸如跨桥、对焊件和汇流排等外部电路材料而减少了。双极性电池是一个有明显优点(比能量比功率高)，同时又有明显的结构缺点(密封和基底材料的腐蚀以及活性物质的脱落)的电池，电池的寿命是其软肋，结构的缺陷(密封问题)往往比性能的缺陷更难攻克。
在双极性铅酸电池中，基板的作用是最重要的。基板的作用是单格间的隔离、对活性物质的支撑与传导电流。它在单格电池中提供密封隔离电解液，必须在腐蚀性的铅酸环境中保持导电作用，并在电池的使用寿命周期中阻止电解液串格。为了满足这些需求，导电基板必须是导电的，是不溶于硫酸、稳定的电池电压窗口，高的析氧、氢电位，不参与电池反应，不渗透电解液，与活性物质具有良好的附着力，容易处理和密封电池外壳。
比如，授权公告号为CN204045671U的中国实用新型专利公开了一种铅酸电池双极性极板，包括碳基双极板、电池涂膏层、玻璃纤维层、上非金属卡条及下非金属卡条；在碳基双极板的正负两个极面上设有向内凹陷的凹陷区域，在凹陷区域内设有二个以上的“十”字形凸台，上下二个“十”字形凸台交错分布；电池涂膏层涂附在凹陷区域内；玻璃纤维层贴附在碳基双极板的正负两个极面上并覆盖电池涂膏层；上非金属卡条卡装在碳基双极板及玻璃纤维层的上端，在上非金属卡条上设有注液孔，注液孔的上端可与外界连通，注液孔的下端与碳基双极板及玻璃纤维层的上端连通；下非金属卡条卡装在碳基双极板及玻璃纤维层的下端。
公开号为CN103985878A的中国发明专利公开了一种铅酸蓄电池双极性板栅及其制作方法，通过在导电塑料片的两面分别热压亚氧化钛材料和铅合金材料，来克服基体材料耐酸耐腐性差、基体材料和活性物质结合力差以及基体材料防酸渗透能力差的问题。
从基板材料(基体材料)如何进行选择，国内外文献及专利公开了很多做法，诸如镀金钛、导电塑料、硅晶片等，但成本高、难密封且与活性物质结合差等问题得不到很好的应用。
发明内容
本发明针对现有技术中存在的不足，提供了一种双极性极板板栅，克服了现有技术中双极性极板中极板材料成本高、难密封且活性物质结合差等问题。
一种双极性极板板栅，包括绝缘基板以及贯穿绝缘基板用于将两侧活性物质电导通的铅条，所述绝缘基板的边缘具有供铅条穿过的通孔，所述绝缘基板两侧表面设置有密封所述通孔的热封膜，所述热封膜的中部具有让铅条至少部分裸露接触活性物质的开口，所述热封膜外侧设置有覆盖隐藏绝缘基板通孔所在区域的绝缘边框，所述绝缘边框围成容纳活性材料的腔体。双极性极板板栅是指用于制作双极性极板的板栅。由于现有技术中基板材料需要同时起到导电和支撑、附着活性材料的作用，需要同时满足耐酸耐腐蚀、导电性能、与活性物质结合力以及防酸渗透能力等多方面的性能要求，所以要么在某个方面性能较差，要么各方面性能较均衡但价格贵成本高。本申请中将双极性极板板栅所需要满足的性能要求进行分解，铅条一方面起到附着活性物质的作用，另一方面还起到汇流作用，而绝缘基板作为支撑作用，同时由热封膜将绝缘基板上供铅条穿过的通孔处进行密封，从而各部分仅需要满足各自所承担部分的功能对材料的要求即可达到综合性能好的板栅。
所述铅条为C型结构，两端穿过通孔后贴靠在绝缘基板的一侧表面，中间部分贴靠在绝缘基板的另一侧表面。生产制作本发明板栅时，先将一根笔直的铅条一端穿过绝缘基板上的通孔，然后折弯，再将另一端穿过对应的通孔，再将这一段也折弯，最后将穿过通孔的两端弯折直到贴靠在绝缘基板的一侧表面。弯折时，可以将一排铅条同时进行弯折操作，增加效率。
每根铅条的两个端部相互靠近。这样可以避免两端部之间存在较大空隙，影响双极性极板在该处的性能。
所述绝缘基板的每个侧面设置有两层铅条，两层铅条垂直交错。可以只使用一层铅条，也可以使用两层铅条，使用两层时，可以将铅条的尺寸适当减小，纵横交错的铅条有利于增强与活性物质之间的附着能力。当然，两层铅条时，对应的在绝缘基板的对应位置需要设置两组通孔，对密封性要求会较一份铅条时有所提高。
所述热封膜包括环形边框和中间若干平行设置的压条，所述环形边框封盖所述通孔，所述压条叠置在所述铅条上，相邻压条之间形成所述开口。经热封后，热封膜的环形边框将通孔密封，而压条可以将铅条压紧在绝缘基板上，避免在使用过程中铅条相对绝缘基板晃动而造成活性物质脱落及通孔处密封不严。
所述压条为倾斜设置，与铅条形成一夹角。
所述绝缘基板两侧的热封膜在通孔处相互粘结。两侧的热封膜在通孔处相互粘结成一体，可以保证密封效果，避免在通孔处发生漏酸或爬酸。
所述铅条的横截面为内窄外宽的梯形结构。内窄外宽是指贴靠绝缘基板的一侧为梯形结构较短的上底，外侧为体型结构较长的下底。这样设计，可以使梯形结构的腰对该处的活性 物质有一个朝向内侧的支撑，可以有效防止活性物质的脱落。
所述绝缘边框的内圈边缘具有倾斜倒角，倒角与绝缘基板之间具有缝隙。该结构也是与上述铅条的横截面为内窄外宽的梯形结构一样，可以对活性物质有一个朝向内侧的支撑，可以有效防止活性物质的脱落。
所述绝缘基板、热封膜和绝缘边框均采用可热封的绝缘硬质塑料制备，相互间通过热封固定。可采用的材料有ABS塑料(丙烯腈-丁二烯-苯乙烯塑料)、PC塑料PC(聚碳酸酯)或PP塑料PP(聚丙烯)。
位于绝缘基板同一端的通孔连通形成槽孔，槽孔的侧壁上设有与铅条一一对应的限位通槽。这样可以降低将铅条弯折穿过绝缘基板的难度，同时在热封膜热封时，可以将槽孔作为一个整体进行密封，相对于各自独立的多个通孔，密封效果会更好。
本发明板栅用于制作双极性极板，通过将双极性极板板栅所需要满足的功能进行分解，铅条一方面起到附着活性物质的作用，另一方面还起到汇流作用，而绝缘基板作为支撑作用，同时由热封膜将绝缘基板上供铅条穿过的通孔处进行密封，从而各部分仅需要满足各自所承担部分的功能对材料的要求即可达到综合性能好的板栅。由于对材料的要求降低，所以可以降低成本，同时密封性及与活性物质的结合能力等都得到有效提高。
附图说明
图1为本发明板栅的爆炸图。
图2为绝缘基板的结构示意图。
图3为本发明板栅的结构示意图。
图4为图3中A-A方向的结构示意图。
图5为图4中B局部放大图。
图6为图3中C-C方向的结构示意图。
图7为图6中D局部放大图。
图8为本发明板栅两层铅条时的爆炸图。
图9为两层铅条时铅条与绝缘基板的组装结构示意图。
具体实施方式
如图1～7所示，一种双极性极板板栅，包括绝缘基板1以及贯穿绝缘基板1用于将两侧活性物质电导通的铅条2，绝缘基板1的边缘具有供铅条2穿过的通孔，绝缘基板1两侧表面设置有密封通孔的热封膜3，热封膜3的中部具有让铅条2至少部分裸露接触活性物质的开口33，热封膜3外侧设置有覆盖隐藏绝缘基板1通孔所在区域的绝缘边框4，绝缘边框4围成容纳活性材料的腔体41。
在一种实施方式中，位于绝缘基板1同一端的通孔连通形成槽孔11，槽孔11的侧壁上设有与铅条2一一对应的限位通槽12，限位通槽12相对于槽孔11再向绝缘基板1的中心位置延伸后形成，铅条2安装后卡入限位通槽12内进行限位固定，防止铅条2串动，这样可以降低将铅条2弯折穿过绝缘基板1的难度，同时在热封膜3热封时，可以将槽孔11作为一个整体进行密封，相对于各自独立的多个通孔，密封效果会更好。
铅条2为C型结构，两端穿过通孔后贴靠在绝缘基板1的一侧表面，中间部分贴靠在绝缘基板1的另一侧表面。生产制作本发明板栅时，先将一根笔直的铅条2一端穿过绝缘基板1上的通孔，然后折弯，再将另一端穿过对应的通孔，再将这一段也折弯，最后将穿过通孔的两端弯折直到贴靠在绝缘基板1的一侧表面。弯折时，可以将一排铅条2同时进行弯折操作，增加效率。每根铅条2的两个端部相互靠近。这样可以避免两端部之间存在较大空隙，影响双极性极板在该处的性能。
热封膜3包括环形边框31和中间若干平行设置的压条32，环形边框31封盖绝缘基板1上的通孔，压条32叠置在铅条2上，相邻压条32之间形成开口33。经热封后，热封膜3的环形边框31将通孔密封，而压条32可以将铅条2压紧在绝缘基板1上，避免在使用过程中铅条2相对绝缘基板1晃动而造成活性物质脱落及通孔处密封不严。压条32为倾斜设置，与铅条2形成一夹角。
如图4和5所示，绝缘基板1两侧的热封膜3在通孔处相互粘结，两侧的热封膜3在通孔处相互粘结成一体，可以保证密封效果，避免在通孔处发生漏酸或爬酸。
铅条2的横截面为内窄外宽的梯形结构。内窄外宽是指贴靠绝缘基板1的一侧为梯形结构较短的上底，外侧为体型结构较长的下底，这样设计，可以使梯形结构的腰对该处的活性物质有一个朝向内侧的支撑，可以有效防止活性物质的脱落。
绝缘边框4的内圈边缘具有倾斜倒角42，倒角42与绝缘基板1之间具有缝隙43。该结构也是与上述铅条的横截面为内窄外宽的梯形结构一样，可以对活性物质有一个朝向内侧的支撑，可以有效防止活性物质的脱落。
绝缘基板1、热封膜3和绝缘边框4均采用可热封的绝缘硬质塑料制备，相互间通过热封固定，可采用的材料有ABS塑料(丙烯腈-丁二烯-苯乙烯塑料)、PC塑料PC(聚碳酸酯)或PP塑料PP(聚丙烯)。
如图8和9所示，绝缘基板1的每个侧面设置有两层铅条2，两层铅条2垂直交错。可以只使用一层铅条2，也可以使用两层铅条2，使用两层时，可以将铅条2的尺寸适当减小，纵横交错的铅条2有利于增强与活性物质之间的附着能力。当然，两层铅条2时，对应的在绝缘基板1的对应位置需要设置两组通孔，对密封性要求会较一份铅条时有所提高。
生产时，先将铅条2与绝缘基板1进行装配，装配时需要将铅条2进行弯折，铅条2与绝缘基板1组装完成后，将两层热封膜3和带有铅条2的绝缘基板1依次层叠后进行第一次 热封，得到半成品，然后将这个半成品与两层绝缘边框4依次层叠后进行第二次热封，热封完成后即得到本发明板栅。

Claims (9)

  1. 一种双极性极板板栅，其特征在于，包括绝缘基板以及贯穿绝缘基板用于将两侧活性物质电导通的铅条，所述绝缘基板的边缘具有供铅条穿过的通孔，所述绝缘基板两侧表面设置有密封所述通孔的热封膜，所述热封膜的中部具有让铅条至少部分裸露接触活性物质的开口，所述热封膜外侧设置有覆盖隐藏绝缘基板通孔所在区域的绝缘边框，所述绝缘边框围成容纳活性材料的腔体。
  2. 如权利要求1所述的双极性极板板栅，其特征在于，所述铅条为C型结构，两端穿过通孔后贴靠在绝缘基板的一侧表面，中间部分贴靠在绝缘基板的另一侧表面。
  3. 如权利要求2所述的双极性极板板栅，其特征在于，每根铅条的两个端部相互靠近。
  4. 如权利要求1所述的双极性极板板栅，其特征在于，所述绝缘基板的每个侧面设置有两层铅条，两层铅条垂直交错。
  5. 如权利要求1所述的双极性极板板栅，其特征在于，所述热封膜包括环形边框和中间若干平行设置的压条，所述环形边框封盖所述通孔，所述压条叠置在所述铅条上，相邻压条之间形成所述开口。
  6. 如权利要求5所述的双极性极板板栅，其特征在于，所述压条为倾斜设置，与铅条形成一夹角。
  7. 如权利要求1所述的双极性极板板栅，其特征在于，所述绝缘基板两侧的热封膜在通孔处相互粘结。
  8. 如权利要求1所述的双极性极板板栅，其特征在于，所述铅条的横截面为内窄外宽的梯形结构。
  9. 如权利要求1所述的双极性极板板栅，其特征在于，所述绝缘边框的内圈边缘具有倾斜倒角，倒角与绝缘基板之间具有缝隙。
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