WO2016197375A1 - Structure de bouchon de batterie de puissance et batterie de puissance - Google Patents

Structure de bouchon de batterie de puissance et batterie de puissance 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
Application number
PCT/CN2015/081269
Other languages
English (en)
Chinese (zh)
Inventor
李全坤
邓平华
王鹏
吴凯
姜俊杰
Original Assignee
宁德时代新能源科技股份有限公司
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 宁德时代新能源科技股份有限公司 filed Critical 宁德时代新能源科技股份有限公司
Priority to PCT/CN2015/081269 priority Critical patent/WO2016197375A1/fr
Publication of WO2016197375A1 publication Critical patent/WO2016197375A1/fr

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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)
  • Sealing Battery Cases Or Jackets (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

La présente invention se rapporte à une structure de bouchon de batterie de puissance et à une batterie de puissance. La structure de bouchon de batterie de puissance comprend une feuille de bouchon, un pôle d'électrode négatif, une feuille conductrice et une feuille de retournement, la feuille conductrice et le pôle d'électrode négatif étant raccordés électriquement l'un à l'autre, et le pôle d'électrode négatif et la feuille de bouchon étant assemblés l'un à l'autre de façon isolante. La feuille de retournement comprend une partie de soudage, un bossage d'une structure solide et une partie de liaison entre la partie de soudage et le bossage, le bossage étant disposé à une position centrale de la partie de liaison et la partie de soudage étant disposée sur un bord externe de la partie de liaison ; la partie de soudage est raccordée électriquement à la feuille de bouchon, le bossage et la feuille conductrice ne sont pas en contact et, lorsque la pression à l'intérieur de la batterie de puissance augmente, la feuille de retournement est pressée par la pression provenant de l'intérieur de la batterie de puissance pour se déplacer vers le haut de sorte à raccorder électriquement le bossage à la feuille conductrice. La structure de bouchon de batterie de puissance et la batterie de puissance selon la présente invention peuvent augmenter de manière efficace la zone de circulation de la surface de contact entre le bossage et la feuille conductrice, réduire un courant de trop-plein et réduire la probabilité que la feuille de retournement soit fondue, ce qui permet de réduire de manière efficace le risque d'incendie ou d'explosion dans la batterie et d'améliorer de manière significative les performances de sécurité de la batterie de puissance.
PCT/CN2015/081269 2015-06-11 2015-06-11 Structure de bouchon de batterie de puissance et batterie de puissance WO2016197375A1 (fr)

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PCT/CN2015/081269 WO2016197375A1 (fr) 2015-06-11 2015-06-11 Structure de bouchon de batterie de puissance et batterie de puissance

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PCT/CN2015/081269 WO2016197375A1 (fr) 2015-06-11 2015-06-11 Structure de bouchon de batterie de puissance et batterie de puissance

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN107665970A (zh) * 2017-11-16 2018-02-06 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
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
CN107946526A (zh) * 2017-11-17 2018-04-20 深圳市瑞德丰精密制造有限公司 带有翻转片的导电块结构
CN108120867A (zh) * 2018-01-30 2018-06-05 天津锦泰勤业精密电子有限公司 过充检测模拟装置及模拟检测方法
CN108428822A (zh) * 2017-08-30 2018-08-21 宁德时代新能源科技股份有限公司 二次电池的顶盖组件以及二次电池
CN112599834A (zh) * 2020-12-04 2021-04-02 广东微电新能源有限公司 一种电池
CN115020933A (zh) * 2022-08-10 2022-09-06 楚能新能源股份有限公司 电芯安全保护装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006147180A (ja) * 2004-11-16 2006-06-08 Toshiba Corp 非水電解質二次電池
CN101950812A (zh) * 2009-07-09 2011-01-19 Sb锂摩托有限公司 可再充电电池
CN102088103A (zh) * 2009-12-08 2011-06-08 Sb锂摩托有限公司 可再充电电池

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006147180A (ja) * 2004-11-16 2006-06-08 Toshiba Corp 非水電解質二次電池
CN101950812A (zh) * 2009-07-09 2011-01-19 Sb锂摩托有限公司 可再充电电池
CN102088103A (zh) * 2009-12-08 2011-06-08 Sb锂摩托有限公司 可再充电电池

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN108428822A (zh) * 2017-08-30 2018-08-21 宁德时代新能源科技股份有限公司 二次电池的顶盖组件以及二次电池
CN108428822B (zh) * 2017-08-30 2023-10-20 宁德时代新能源科技股份有限公司 二次电池的顶盖组件以及二次电池
CN107665970A (zh) * 2017-11-16 2018-02-06 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
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
CN107946526A (zh) * 2017-11-17 2018-04-20 深圳市瑞德丰精密制造有限公司 带有翻转片的导电块结构
CN108120867A (zh) * 2018-01-30 2018-06-05 天津锦泰勤业精密电子有限公司 过充检测模拟装置及模拟检测方法
CN108120867B (zh) * 2018-01-30 2023-08-25 浙江锦泰电子有限公司 过充检测模拟装置及模拟检测方法
CN112599834A (zh) * 2020-12-04 2021-04-02 广东微电新能源有限公司 一种电池
CN115020933A (zh) * 2022-08-10 2022-09-06 楚能新能源股份有限公司 电芯安全保护装置

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