WO2016197375A1 - 动力电池顶盖结构及动力电池 - Google Patents

动力电池顶盖结构及动力电池 Download PDF

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Publication number
WO2016197375A1
WO2016197375A1 PCT/CN2015/081269 CN2015081269W WO2016197375A1 WO 2016197375 A1 WO2016197375 A1 WO 2016197375A1 CN 2015081269 W CN2015081269 W CN 2015081269W WO 2016197375 A1 WO2016197375 A1 WO 2016197375A1
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WO
WIPO (PCT)
Prior art keywords
power battery
sheet
boss
top cover
connecting portion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2015/081269
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English (en)
French (fr)
Inventor
李全坤
邓平华
王鹏
吴凯
姜俊杰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Contemporary Amperex Technology Co Ltd
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Contemporary Amperex Technology Co Ltd
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Publication date
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Priority to PCT/CN2015/081269 priority Critical patent/WO2016197375A1/zh
Publication of WO2016197375A1 publication Critical patent/WO2016197375A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/574—Devices or arrangements for the interruption of current
    • H01M50/583—Devices or arrangements for the interruption of current in response to current, e.g. fuses
    • 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 power batteries, and in particular relates to a power battery top cover structure and a power battery.
  • Electric vehicles and energy storage power stations and the like generally require a power battery having a large capacity as a power source.
  • these power batteries should also have good safety and long cycle life, in order to meet the standards of use and meet people's needs.
  • the decomposition of the electrolyte in the power battery may cause excessive heat generated inside the power battery to cause the battery to ignite; or the internal pressure of the power battery may increase to cause the battery to explode. Therefore, before the power battery is out of control, it is necessary to cut off the fuse structure in the main circuit of the power battery by means of an external short circuit structure to prevent the power battery from continuing to charge. For example, when the power battery is overcharged, when a certain air pressure is generated inside the power battery, the external short circuit structure acts, so that the power battery itself forms a loop, causing the fuse to blow, thereby cutting off the main circuit.
  • FIG. 1 is a partial structural schematic view of a power battery top cover in the prior art.
  • the flip chip 1 is used in the prior art to realize the function of the outer short-circuit structure.
  • the flip-chip 1 adopts a thin and uniform disk, and a hollow convex top surface is arranged in the center of the disk. . In normal use, the flip chip 1 is disconnected from the negative pole 2 on the top cover of the power battery.
  • the air pressure pushes the flipping sheet 1 to cause the top surface of the bump in the flipping sheet 1 to be connected with the conductive sheet 3, and the conductive sheet 3 is electrically connected to the negative pole 2, thereby A circuit is formed in the power battery to fuse the fuse, cut off the main circuit, and protect the power battery.
  • the top surface of the protrusion in the flipping sheet 1 is in contact with the conductive sheet 3, and the protrusion is a hollow structure, and the flow area is small.
  • a large current is generated at the contact position of the bump of the flip chip 1 and the conductive sheet 3.
  • the flip chip 1 is blown, resulting in a risk of fire or explosion of the power battery.
  • the invention provides a power battery top cover structure and a power battery, which is used for solving the problem that the inner ring over-flow area is small due to the uniform wall thickness of the flip sheet in the prior art, and the high current is easily blown when passing, thereby causing the flipper to lose its function and power. A defect in the battery that is on fire or explosion.
  • the present invention provides a power battery top cover structure
  • the power battery top cover structure includes a top cover sheet, a negative electrode column, a conductive sheet and a flip sheet, wherein the conductive sheet is electrically connected to the negative pole, the negative column and
  • the top cover sheet is insulatively assembled;
  • the flip sheet includes a welded portion, a solid structure boss, and a connecting portion between the welded portion and the boss, the boss being disposed at a center of the connecting portion Positioned, the soldering portion is disposed at an outer edge of the connecting portion; the soldering portion is electrically connected to the top cover sheet, the boss is not in contact with the conductive sheet, and when the internal pressure of the power battery is increased
  • the flipper is subjected to pressure inside the power battery and acts upward to electrically connect the boss to the conductive sheet.
  • the thickness of the connecting portion gradually decreases in a direction from the inside to the outside.
  • the thickness of the boss is greater than the thickness of the connecting portion.
  • the boss is a cylindrical structure.
  • the welded portion, the boss, and the connecting portion of the flip sheet are an integrated structure.
  • the present invention also provides a power battery, the top cover structure of the power battery adopting the power battery top cover structure as described above.
  • the power battery top cover structure and the power battery of the invention can effectively increase the overcurrent area of the contact surface between the boss and the conductive sheet by setting the boss of the solid structure, reduce the overcurrent current, and reduce the probability that the flip sheet is blown, thereby It can effectively reduce the risk of fire or explosion of the power battery, and greatly improve the safety performance of the power battery.
  • FIG. 1 is a partial structural schematic view of a conventional power battery top cover.
  • FIG. 2 is a schematic structural view of an embodiment of a battery top cover structure of the present invention.
  • FIG. 3 is an enlarged schematic view of a region A in FIG. 2.
  • FIG. 4 is a schematic structural view of another embodiment of a power battery top cover structure of the present invention.
  • Figure 5 is an enlarged schematic view of a region A in Figure 4.
  • Fig. 6A is a plan view of a flip sheet in the power battery cover structure of the present invention.
  • Figure 6B is a cross-sectional view taken along line F-F of Figure 6A.
  • Fig. 6C is an enlarged schematic view of a region E in Fig. 6B.
  • Fig. 7 is a schematic structural view of a power battery of the present invention.
  • the power battery top cover structure shown in FIG. 1 is used.
  • the flip chip 1 When the internal pressure of the power battery generates a certain air pressure, the flip chip 1 is electrically connected to the conductive sheet 3, and the conductive sheet 3 is electrically connected to the negative pole 2 of the power battery, thereby making the power battery.
  • Form a loop by itself. If the loop resistance is controlled within 4mohm, the loop current I power battery voltage (4-5V) / loop resistance (0.8-4mohm), loop current can reach 1000-6400A, that is, the current of the loop It will be very big.
  • the power battery overcharge current is usually 1C, the current can reach 3C or more during normal operation, so the Fuse with an overcurrent of only 1C cannot be set in the main circuit.
  • the commonly used power battery Fuse is required to continue to flow over 10C.
  • the 30Ah power battery Fuse needs to continue to flow over 300A, and if the overcurrent is continued, the fuse current should be at least 600A.
  • the power battery top cover structure can instantaneously blow the Fuse and cut off the main circuit, thereby achieving the purpose of protecting the power battery.
  • the power battery is basically a narrow and long structure, which is not too thick, and limits the size of the flipping sheet 1.
  • the action of the flipping sheet 1 is required.
  • the area is thinned, usually about 0.1-0.3 mm.
  • the flipping sheet 1 is first blown when a large current flows, resulting in electricity.
  • the core is on fire. Therefore, the overcurrent area of the flip sheet 1 is at least 1.2 times the overcurrent area of the Fuse, so that the power battery can be effectively protected.
  • the normal temperature rise of the battery core cannot be too high, and the Fuse of the single battery core is blown after the Fuse of the entire power battery module at the same current, so the overcurrent area of the Fuse cannot be too small.
  • the flow area of the Fuse is at least 3.5 mm 2 or more, so the flow area of the inverted sheet 1 is at least 4.2 mm 2 or more.
  • the cross-sectional area for each position of the circular flip sheet 1 3.14 * diameter D * section thickness T.
  • the wall thickness of the flipping sheet 1 is about 0.1-0.3 mm, so that the inner ring cross-sectional area of the flipping sheet 1 is small, such as
  • the cross-sectional position of the overcurrent position is 3.14*4*0.3 ⁇ 3.77mm 2 , so that when the current is large, the flipping sheet 1 will be blown before the Fuse is blown, causing the battery to ignite or explode.
  • the present invention provides a solution for ensuring that the flip chip 1 does not blow before the Fuse is blown, thereby ensuring the safety of the power battery.
  • the technical solutions of the embodiments of the present invention are described in detail below.
  • the present invention includes a flip sheet 11, a negative electrode post 12, a conductive sheet 13, a positive electrode post 14, and a top cover sheet 15.
  • the positive electrode column 14 is electrically connected to the top cover sheet 15
  • the negative electrode column 12 is insulated from the top cover sheet 15
  • the negative electrode column 12 is electrically connected to the conductive sheet 13 .
  • the flip sheet 11 specifically includes a soldering portion 16 , a solid structure boss 18 , and a connecting portion 17 between the soldering portion 16 and the boss 18, the boss 18 is disposed at a central position of the connecting portion 17, and the soldering portion 16 is disposed at an outer edge of the connecting portion 17; the flipping sheet 11 is not in contact with the conductive sheet 13, When the internal pressure of the power battery increases, the flipper 11 receives pressure from the inside of the power battery and moves upward, so that the boss 18 and the conductive sheet 13 can be electrically connected.
  • the flipping piece 11 moves upward under the pressure until the boss 18 is electrically connected with the conductive piece 13, so that the power battery between the positive electrode column 14 and the negative electrode column 12 A loop is formed, and a large short-circuit current flows, so that the Fuse in the main circuit is blown, and the main circuit is cut off, thereby protecting the power battery. Since the position where the boss 18 is in contact with the conductive sheet 13 is an overcurrent neck region, the current is large at the moment when the boss 18 comes into contact with the conductive sheet 13, and the contact position is locally melted easily.
  • the boss 18 is formed into a solid structure.
  • the cross-sectional area per current flowing through the inversion piece 11 3.14 * diameter D * thickness T, relative to the inversion piece of uniform thickness in the prior art, by increasing the thickness T, the boss 18 and the conductive piece 13 of the solid structure can be made The overcurrent area of the contact surface is increased to ensure that the boss 18 cannot be melted first under a large current.
  • the boss 18 of the present embodiment may be a cylinder or a cylinder having a polygonal cross section (such as a square, a pentagon or a hexagon, etc.); but when the inner diameter is the same, the circumference of the circle is the longest, in the convex In the case where the stage 18 has the same thickness, the overflow area of the cylinder is the largest. Therefore, the boss 18 of the present embodiment is preferably a cylinder.
  • the overcurrent area of the contact surface between the boss 18 and the conductive sheet 13 can be effectively increased, the overcurrent can be reduced, and the probability that the flipper 11 is melted can be reduced, thereby effectively The risk of fire or explosion of the power battery is reduced, and the safety performance of the power battery is greatly improved.
  • the boss 18 is solid, but the connecting portion 17 of the flipping piece 11 is not limited at all, and the connecting portion 17 may still be a thin plate having a uniform thickness. .
  • the connecting portion 17 may still be a thin plate having a uniform thickness.
  • the cross-sectional area per current flowing through the inversion piece 11 3.14 * diameter D * thickness T
  • the flow area of the current flowing through the connecting portion 17 of the inverting piece 11 may be smaller than the current flow.
  • the overcurrent area of the boss 18 causes the connecting portion 17 to be blown instantaneously.
  • the present invention also provides the technical solutions of the following embodiments.
  • FIG. 4 is a schematic structural view of another embodiment of a power battery top cover structure of the present invention.
  • 5 is an enlarged schematic view of the area A in FIG. 4, as shown in FIG. 4 and FIG. 5, the present embodiment is based on the technical solution of the embodiment shown in FIG. 2 and FIG.
  • the thickness of 17 gradually decreases in the direction from the inside to the outside.
  • FIG. 6A is a motion provided by an embodiment of the present invention.
  • FIG. 6B is a cross-sectional view taken along the line F-F in FIG. 6A; and
  • FIG. 6C is an enlarged view of a region E in FIG. 6B.
  • the flipping sheet 11 in this embodiment may have a disk shape in plan view.
  • the annular shape of the outer edge is the welded portion 16; the boss 18 is located at the center of the disk; and the connecting portion 17 is located between the welded portion 16 and the boss 18.
  • the connecting portion 17 of the inverting piece 11 of the present embodiment gradually increases in thickness from the boss 18 to the welded portion 16, that is, from the inside to the outside.
  • the thickness of the boss 18 is larger than the thickness of the connecting portion 17.
  • the thickness of the connecting portion 17 is gradually thinned from the inside to the outside, and the cross-sectional area formula of the current flowing through the flipper 11 per turn shows that the connecting portion 17 is
  • the inner ring is thick, which can reduce the influence of the small diameter of the inner ring; when the overcurrent is diffused to the outer ring, although the thickness of the outer ring becomes thinner, the diameter D of the outer ring becomes larger, and the overcurrent can still be withstood. The impact prevents the connecting portion 17 from being directly blown.
  • the cross-sectional area of the entire connecting portion 17 can be made to satisfy the current overcurrent requirement from the inside out, and at the same time, since the outer ring wall of the connecting portion 17 in the inverting piece 11 is thin, the flipping piece 11 can be moved upward at a certain pressure.
  • the connecting portion 17 by designing the connecting portion 17 to have a variable cross-sectional structure, it is possible to ensure not only that the inverting piece 11 can satisfy the pressure required for the operation, but also to effectively increase the flow area of the inner ring of the connecting portion 17 and reduce the flow area.
  • the overcurrent reduces the probability that the flipper 11 is blown, thereby effectively reducing the risk of fire or explosion of the power battery, and further enhancing the safety performance of the power battery.
  • the inverting piece 11 in the power battery top cover structure can be designed as an integral structure for the convenience of fabrication, the welded portion 16, the connecting portion 17, and the boss 18.
  • Fig. 7 is a schematic structural view of a power battery of the present invention.
  • the power battery of the present embodiment includes a power battery top cover structure 21, a battery case 22, a Fuse 23, an insulating sheet 24, and the like.
  • the power battery top cover structure can adopt the power battery top cover structure shown in FIG. 2 and FIG. 3 above, which can effectively increase the overcurrent area of the contact surface between the boss 18 and the conductive sheet 13, reduce the overcurrent, and reduce the flipping sheet 11. The probability of being blown can effectively reduce the risk of fire or explosion of the power battery, and greatly improve the safety performance of the power battery.
  • the power battery top cover structure in the power battery of the embodiment may also adopt the power battery top cover structure shown in FIGS. 4 and 5 described above. As shown in FIG. 7, the technical solution of the embodiment is described by taking the power battery top cover structure shown in FIG. 4 and FIG. 5 as an example. It should be noted, The power battery of this embodiment may further include other components. For details, refer to the related related art, and details are not described herein again.
  • the overcurrent area of the flipping sheet 11 is effectively increased, the overcurrent is reduced, and the probability that the flipping sheet 11 is blown is reduced, thereby enabling It effectively reduces the risk of fire or explosion of the power battery and greatly improves the safety performance of the power battery.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

本发明提供一种动力电池顶盖结构及动力电池。其中所述动力电池顶盖结构包括顶盖片、负极柱、导电片以及翻转片，导电片与负极柱电连接，负极柱和顶盖片绝缘装配；翻转片包括焊接部、实心结构的凸台以及位于焊接部和凸台之间的连接部，凸台设置在连接部的中央位置，焊接部设置在连接部的外边缘；焊接部与顶盖片电连接，凸台与导电片不接触，且在动力电池内部压力增大时，翻转片受到动力电池内部的压力，向上动作，能够使得凸台与导电片电连接。本发明的动力电池顶盖结构及动力电池，可以有效地增加凸台与导电片接触面的过流面积，减少过流电流，减少翻转片被熔断的概率，从而有效地降低动力电池起火或者爆炸的危险，极大地提高动力电池的安全性能。

Description

动力电池顶盖结构及动力电池 技术领域
本发明属于动力电池技术领域，尤其涉及一种动力电池顶盖结构及动力电池。
背景技术
电动汽车和储能电站等一般需要使用具有大容量的动力电池作为电源。这些动力电池除了具有高容量，还应当具有良好的安全性及较长的循环寿命等，才能达到使用的标准和满足人们的需求。
现有技术中，当动力电池过充时，动力电池中的电解液的分解会使动力电池内部产生过量的热造成电池起火；或者会使动力电池内部压力增大导致电池爆炸。因此在动力电池失控之前，需要借助于一个外短路结构来切断动力电池的主回路中的保险丝(Fuse)结构，阻止动力电池继续充电。例如，在动力电池过充的时候，当动力电池内部产生一定气压，外短路结构起作用，使动力电池本身形成一个回路，使得Fuse熔断，从而切断主回路。该外短路结构需要在一定气压下起作用，且过流能力比Fuse强，不能在大电流下先于Fuse熔断。图1为现有技术中的动力电池顶盖的部分结构示意图。如图1所示，现有技术中采用翻转片1来实现该外短路结构的功能，该翻转片1采用一块薄厚均匀的圆盘，并在该圆盘中央设置一个空心的凸起的顶面。正常使用的时候，翻转片1与动力电池顶盖上的负极柱2是断开绝缘的。当动力电池过充并产生一定气压时，气压会推动翻转片1动作，使得翻转片1中的凸起的顶面与导电片3连接，而导电片3又与负极柱2电连接，从而在动力电池内形成回路，使得Fuse熔断，切断主回路，保护了动力电池。
但是，当动力电池过充并产生一定气压时，气压推动翻转片1动作之后，翻转片1中的凸起的顶面与导电片3接触，而凸起为空心结构，过流面积较小，在翻转片1的凸起与导电片3的接触位置会产生较大电流，当电流大到一定程度，会使得翻转片1被熔断，导致动力电池存在起火或者爆炸的危险。
发明内容
本发明提供一种动力电池顶盖结构及动力电池，用于解决现有技术中由于翻转片壁厚均匀导致的内圈过流面积小，大电流通过时容易熔断，导致翻转片失去作用，动力电池起火或爆炸的缺陷。
本发明提供一种动力电池顶盖结构，所述动力电池顶盖结构包括顶盖片、负极柱、导电片以及翻转片，其中所述导电片与所述负极柱电连接，所述负极柱和所述顶盖片绝缘装配；所述翻转片包括焊接部、实心结构的凸台以及位于所述焊接部和所述凸台之间的连接部，所述凸台设置在所述连接部的中央位置，所述焊接部设置在所述连接部的外边缘；所述焊接部与所述顶盖片电连接，所述凸台与所述导电片不接触，且在动力电池内部压力增大时，所述翻转片受到所述动力电池内部的压力，向上动作，能够使得所述凸台与所述导电片电连接。
进一步地，上述动力电池顶盖结构中，所述连接部的厚度在从内而外的方向上逐渐减小。
进一步地，上述动力电池顶盖结构中，所述凸台的厚度大于所述连接部的厚度。
进一步地，上述动力电池顶盖结构中，所述凸台为圆柱体结构。
进一步地，上述动力电池顶盖结构中，所述翻转片的所述焊接部、所述凸台以及所述连接部为一体化结构。
本发明还提供一种动力电池，所述动力电池的顶盖结构采用如上所述的动力电池顶盖结构。
本发明的动力电池顶盖结构及动力电池，通过设置实心结构的凸台，可以有效地增加凸台与导电片接触面的过流面积，减少过流电流，减少翻转片被熔断的概率，从而能够有效地降低了动力电池起火或者爆炸的危险，极大地提高了动力电池的安全性能。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作一简单地介绍，显而易见地， 下面描述中的附图是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。
图1为现有动力电池顶盖的部分结构示意图。
图2为本发明的电池顶盖结构的一实施例的结构示意图。
图3为图2中区域A的放大示意图。
图4为本发明的动力电池顶盖结构的另一实施例的结构示意图。
图5为图4中区域A的放大示意图。
图6A为本发明的动力电池盖结构中的翻转片的俯视图。
图6B为图6A中F-F方向的剖面图。
图6C为图6B中区域E的放大示意图。
图7为本发明的动力电池的结构示意图。
具体实施方式
为使本发明实施例的目的、技术方案和优点更加清楚，下面将结合现有动力电池顶盖结构以及本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
采用图1所示的动力电池顶盖结构，当动力电池内部压力产生一定气压时，翻转片1与导电片3电连接，而导电片3又与动力电池负极柱2电连接，从而使动力电池本身形成一个回路，如果将回路电阻控制在4mohm以内，回路电流I＝动力电池电压(4-5V)/回路电阻(0.8-4mohm)，回路电流可达1000-6400A，也就是说，回路的电流会非常大。这样，当动力电池过充电流通常为1C，正常工作时电流能够达到3C以上，所以主回路中不能设置过流仅为1C的Fuse。常用的动力电池Fuse都要求能够持续过流10C以上。例如：30Ah的动力电池Fuse需要能持续过流300A，而能否持续过流，则熔断电流至少要600A以上。这样动力电池顶盖结构才可以瞬间熔断Fuse，切断主回路，从而达到保护动力电池的目的。
动力电池基本是窄长结构，不会太厚，限制了翻转片1的尺寸，为了 确保翻转片1能够在一定压力下动作(如图1所示为向上动作)，需要将翻转片1的动作区域压薄，通常为0.1-0.3mm左右。为了确保翻转片1过流能力比Fuse强，需要翻转片1动作后与导电片3接触位置面积大而且非接触位置的环形截面积大。翻转片1向上动作之后与导电片3接触瞬间有很大的电阻，所以，即使翻转片1的过流面积与Fuse的过流面积相等，大电流流过时翻转片1也会先熔断，导致电芯起火。所以，翻转片1的过流面积至少达到Fuse的过流面积的1.2倍以上，才可以对动力电池进行有效保护。而动力电池正常工作时，电芯的正常使用温升不能太高，单电芯的Fuse在相同电流下要比整个动力电池电池模组的Fuse后熔断，所以Fuse的过流面积不能太小。例如在30Ah时Fuse的过流面积至少在3.5mm2以上，所以翻转片1的过流面积至少在4.2mm2以上。对于圆形翻转片1每个位置的截面积＝3.14*直径D*截面厚度T。如果翻转片1做成壁厚均匀的，为了确保翻转片1能够在一定压力下向上动作，翻转片1的壁厚为0.1-0.3mm左右，这样翻转片1内圈截面积就很小，如过流位置截面积＝3.14*4*0.3≈3.77mm2，这样电流较大时，翻转片1就会在Fuse熔断之前先熔断，引起电池起火或爆炸。
为了解决上述问题，本发明提供一种方案能够保证翻转片1在Fuse熔断之前不会熔断，保证了动力电池的安全。本发明实施例的技术方案详细如下。
图2为本发明的动力电池顶盖结构的一实施例的结构示意图。图3为图2中区域A的放大示意图。如图2和图3所示，本发明包括翻转片11，负极柱12，导电片13，正极柱14以及顶盖片15。正极柱14与顶盖片15电连接，负极柱12与顶盖片15绝缘装配，负极柱12与导电片13电连接，其中，翻转片11具体包括焊接部16、实心结构的凸台18以及位于焊接部16和凸台18之间的连接部17，凸台18设置在连接部17的中央位置，焊接部16设置在连接部17的外边缘；翻转片11与导电片13靠近不接触，且在动力电池内部压力增大时，翻转片11受到动力电池内部的压力，向上动作，能够使得凸台18与导电片13电连接。
当动力电池内部产生一定气压时，翻转片11在压力作用下向上动作，直至凸台18与导电片13电连接，使动力电池正极柱14和负极柱12之间 形成回路，有很大的短路电流流过，使主回路中的Fuse熔断，切断主回路，从而保护动力电池。由于凸台18与导电片13接触的位置是过流的瓶颈区域，因此在凸台18在与导电片13接触瞬间电流很大，容易导致接触位置局部熔化。
本实施例中，将凸台18做成实心结构。电流流过翻转片11每圈的截面积＝3.14*直径D*厚度T，相对比现有技术中均匀厚度的翻转片，通过增加厚度T，从而可以使得实心结构的凸台18与导电片13接触面的过流面积增大，从而保证大电流下先不能熔断凸台18。
例如本实施例的凸台18可以为圆柱体、或者截面为多边形(如正方形、五边形或者六边形等等)的柱体；但是在内径相同时，圆的周长最长，在凸台18同等厚度的情况下，圆柱体的过流面积时最大的，因此，本实施例的凸台18优选为圆柱体。
本实施例中，通过设置实心结构的凸台18，可以有效地增加凸台18与导电片13接触面的过流面积，减少过流电流，减少翻转片11被熔断的概率，从而能够有效地降低了动力电池起火或者爆炸的危险，极大地提高了动力电池的安全性能。
上述图2和图3所示实施例的动力电池顶盖结构中，凸台18为实心的，但是翻转片11的连接部17并没有任何限定，该连接部17有可能仍然为厚度均匀的薄片。这样当动力电池内部压力增大，气压推动翻转片11动作之后，翻转片11与导电片13电连接之后，电流会一圈一圈向外散射。当电流散射至连接部17时，连接部17的过流面积不能比凸台18的小，否则连接部17瞬间也会被熔断。根据电流流过翻转片11每圈的截面积＝3.14*直径D*厚度T，当连接部17的厚度较薄时，电流流过翻转片11的连接部17的过流面积，可能小于电流流过凸台18的过流面积，导致连接部17瞬间被熔断。
为了解决上述问题，本发明还提供如下实施例的技术方案。
图4为本发明的动力电池顶盖结构的另一实施例的结构示意图。图5为图4中区域A的放大示意图，如图4和图5所示，本实施例在上述图2和图3所示实施例的技术方案的基础上，将翻转片11结构中连接部17的厚度在从内而外的方向上逐渐减小。其中图6A为本发明实施例提供的动 力电池盖结构中的翻转片11的俯视图；图6B为图6A中F-F方向的剖面图；图6C为图6B中区域E的放大示意图。如图6A所示，本实施例中的翻转片11的俯视可以为一个圆盘状的。其中外边缘的圆环状为焊接部16；位于圆盘中央的为凸台18；位于焊接部16和凸台18之间的为连接部17。如图6B和图6C所示，本实施例的翻转片11的连接部17从凸台18到焊接部16的方向上即由内向外的方向上，厚度逐渐增加。且如图6A、图6B和图6C所示，凸台18的厚度大于连接部17的厚度。
如图4、图5、图6A、图6B和图6C所示，连接部17的厚度由内向外逐渐变薄，由上述电流流过翻转片11每圈的截面积公式可知，连接部17由于内圈厚，可以减小内圈直径小带来的影响；当过流电流向外圈扩散时，虽然外圈厚度变薄，但是外圈的直径D变大，仍然可以承受过流电流带来的冲击，避免连接部17直接被熔断。这样，可以使得整个连接部17的截面积由内而外都满足电流过流要求，同时由于翻转片11中连接部17的外圈壁薄，在一定气压下能够使翻转片11向上动作。
本实施例中，通过将连接部17设计成变截面的结构，不仅能够确保翻转片11能够满足动作起来所需要的压力需要，还能有效地增加了连接部17内圈的过流面积，减少过流电流，减少翻转片11被熔断的概率，从而能够有效地降低动力电池起火或者爆炸的危险，进一步增强了动力电池的安全性能。
上述实施例中的动力电池顶盖结构中的翻转片11，为了制作方便，可以将焊接部16、连接部17以及凸台18设计为一体的结构。
图7为本发明的动力电池的结构示意图。如图7所示，本实施例的动力电池包括动力电池顶盖结构21、电池壳体22、Fuse 23、绝缘片24等等。其中动力电池顶盖结构可以采用上述图2和图3所示的动力电池顶盖结构，可以有效地增加凸台18与导电片13接触面的过流面积，减少过流电流，减少翻转片11被熔断的概率，从而能够有效地降低了动力电池起火或者爆炸的危险，极大地提高了动力电池的安全性能。
本实施例的动力电池中的动力电池顶盖结构也可以采用上述图4和图5所示的动力电池顶盖结构。如图7所示，本实施例中以采用图4和图5所示的动力电池顶盖结构为例描述本实施例的技术方案。需要说明的是， 本实施例的动力电池还可以包括其它部件，详细可以参考现有相关技术，在此不再赘述。
本实施例中的动力电池，通过采用上述实施例中的动力电池顶盖结构，有效的增大了翻转片11的过流面积，减少过流电流，减少翻转片11被熔断的概率，从而能够有效地降低了动力电池起火或者爆炸的危险，极大地提高了动力电池的安全性能。
最后应说明的是：以上实施例仅用以说明本发明的技术方案，而非对其限制；尽管参照前述实施例对本发明进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本发明各实施例技术方案的精神和范围。

Claims (6)

  1. 一种动力电池顶盖结构，所述动力电池顶盖结构包括顶盖片、负极柱、导电片以及翻转片，其中所述导电片与所述负极柱电连接，所述负极柱和所述顶盖片绝缘装配；其特征在于，所述翻转片包括焊接部、实心结构的凸台以及位于所述焊接部和所述凸台之间的连接部，所述凸台设置在所述连接部的中央位置，所述焊接部设置在所述连接部的外边缘；所述焊接部与所述顶盖片电连接，所述凸台与所述导电片不接触，且在动力电池内部压力增大时，所述翻转片受到所述动力电池内部的压力，向上动作，能够使得所述凸台与所述导电片电连接。
  2. 根据权利要求1所述的动力电池顶盖结构，其特征在于，所述连接部的厚度在从内而外的方向上逐渐减小。
  3. 根据权利要求2所述的动力电池顶盖结构，其特征在于，所述凸台的厚度大于所述连接部的厚度。
  4. 根据权利要求1所述的动力电池顶盖结构，其特征在于，所述凸台为圆柱体结构。
  5. 根据权利要求1-4任一所述的动力电池顶盖结构，其特征在于，所述翻转片的所述焊接部、所述凸台以及所述连接部为一体化结构。
  6. 一种动力电池，其特征在于，所述动力电池的顶盖结构采用如上权利要求1-5任一所述的动力电池顶盖结构。
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CN107482140A (zh) * 2017-08-11 2017-12-15 长沙锂安能电子科技有限公司 一种外置双保险保护装置的电池盖板
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CN107732094A (zh) * 2017-11-16 2018-02-23 北京国能电池科技有限公司 电池过充安全保护装置和锂离子电池
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