WO2018153156A1 - Ensemble d'électrodes de batterie et ensemble plaque de recouvrement, et batterie - Google Patents

Ensemble d'électrodes de batterie et ensemble plaque de recouvrement, et batterie Download PDF

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Publication number
WO2018153156A1
WO2018153156A1 PCT/CN2017/117409 CN2017117409W WO2018153156A1 WO 2018153156 A1 WO2018153156 A1 WO 2018153156A1 CN 2017117409 W CN2017117409 W CN 2017117409W WO 2018153156 A1 WO2018153156 A1 WO 2018153156A1
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WO
WIPO (PCT)
Prior art keywords
battery
conductive sheet
electrode assembly
electrode terminal
temperature
Prior art date
Application number
PCT/CN2017/117409
Other languages
English (en)
Chinese (zh)
Inventor
鲁鹏
蒋露霞
王信月
胡世超
杨珂利
Original Assignee
比亚迪股份有限公司
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
Priority claimed from CN201720182208.9U external-priority patent/CN206685462U/zh
Priority claimed from CN201710110189.3A external-priority patent/CN108511670B/zh
Application filed by 比亚迪股份有限公司 filed Critical 比亚迪股份有限公司
Publication of WO2018153156A1 publication Critical patent/WO2018153156A1/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
    • 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
    • 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 present invention relates to the field of battery safety protection, and in particular to a battery electrode assembly, a cover assembly and a battery.
  • the batteries have no safety protection structure on the cover plate, and the cover plate is only used as a support pole.
  • the cover plate is only used as a support pole.
  • abuse conditions such as impact, foreign matter puncture or overheating, a series of complex electrochemical reactions occur inside the battery.
  • the battery may be in danger of igniting or even exploding when the battery is out of control.
  • an electrode terminal, an adapter, a flipper, a support member, and an inner lead-out piece are disposed inside the battery, and the electrode terminal is electrically connected to the adapter, and the electrical connection between the adapter and the flipper is performed, and the flipper is turned over.
  • the present invention provides A battery electrode assembly, a cover assembly and a battery for improving battery overcurrent capability and improving battery safety performance.
  • the present invention provides a battery electrode assembly including a cap, a conductive sheet, an electrode terminal, and at least one temperature memory elastic member, the cap being electrically connected to the electrode terminal through a conductive sheet, the temperature memory elasticity An element is disposed between the electrode terminal and the conductive sheet, and the temperature memory elastic element can elastically extend to the conductive sheet to disconnect the electrode terminal and the cap when the internal temperature of the battery is higher than a preset temperature control threshold Electrical connection.
  • a portion of the conductive sheet is connected to an end surface of the electrode terminal to form a connection point, and the temperature memory elastic member elastically extends to push up the conductive sheet when the internal temperature of the battery is higher than a preset temperature control threshold.
  • the connection point is opened to disconnect the electrical connection of the electrode terminal to the cap.
  • the conductive sheet is provided with a score
  • the temperature memory elastic element is disposed under the notch of the conductive sheet, and the temperature memory elastic element can be higher than the preset temperature control threshold in the battery internal temperature.
  • the score is weak, the electrical connection between the electrode terminal and the cap is broken.
  • the battery electrode assembly includes a support member, and a support member is further disposed between the cap and the conductive sheet, and a part of the conductive sheet is connected with an end surface of the electrode terminal to form a connection point, and the notch is located at the support member and Between the connection points.
  • the electrode terminal surface is provided with a groove, and the temperature memory elastic member is located in the groove.
  • the cap lower surface and/or the temperature memory elastic member is provided with an insulating coating.
  • the electrode assembly includes a conductive ring, and an outer circumference of the cap and an outer circumference of the conductive sheet are fixedly connected to the conductive ring, and a central recess of the conductive sheet is connected to the electrode terminal.
  • the middle portion of the conductive sheet is soldered to the electrode terminal.
  • the lower surface non-joining portion of the conductive sheet is provided with an insulating layer.
  • the temperature memory elastic element is a spring-like memory alloy element.
  • the preset temperature control threshold is 60-80 degrees Celsius.
  • the present invention provides a cover assembly comprising a cover body, an insulating sealing structure, and the battery electrode assembly according to any of the above embodiments, wherein the cover body is provided with a through hole.
  • the battery electrode assembly is disposed at the through hole, and the electrode terminal of the battery electrode assembly extends into the battery interior, and the electrode terminal and the cover body are insulated and sealed by an insulating sealing structure.
  • the present invention provides a battery comprising a battery case, a battery core located in the battery case, and a cover plate assembly enclosing the battery case, the cover plate assembly being any one of the above embodiments The cover assembly.
  • the temperature memory elastic member can be higher in the internal temperature of the battery than a preset temperature control threshold
  • the elastic extension acts on the conductive sheet to break the electrical connection between the electrode terminal and the cap.
  • connection with the conductive sheet thereby realizing the disconnection of the internal circuit of the battery, the trigger condition of the battery electrode assembly for the protection of the battery is changed from the pressure to the temperature, and the tensile force of the conductive sheet is improved by the temperature memory elastic member.
  • the thickness of the conductive sheet is ensured, the overcurrent capability of the battery is improved, and the performance of the battery is optimized.
  • FIG. 1 is an exploded view of a cover assembly according to an embodiment of the present invention
  • FIG. 2 is a schematic side view of a cover assembly according to an embodiment of the present invention.
  • FIG. 3 is a schematic diagram of a battery according to an embodiment of the present invention.
  • FIG. 4 is an exploded view of a cover assembly (including a support member) according to an embodiment of the present invention
  • Figure 5 is a side view (including a support member) of a cover assembly according to an embodiment of the present invention
  • FIG. 6 is a schematic structural view (including a support member) of a battery according to an embodiment of the present invention.
  • Cap 11 conductive sheet 12; connection point 13; temperature memory elastic element 14; support member 15; cover body 21; conductive ring 231; ceramic ring 232; transition ring 233; injection molded part 234; cell 31; negative terminal 32; Positive terminal 33; inner lead piece 34.
  • first and second are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated.
  • features defining “first” or “second” may include at least one of the features, either explicitly or implicitly.
  • the meaning of "a plurality” is at least two, such as two, three, etc., unless specifically defined otherwise.
  • the terms “installation”, “connected”, “connected”, “fixed” and the like should be understood broadly, and may be either a fixed connection or a detachable connection, unless explicitly stated and defined otherwise. , or integrated; can be mechanical or electrical connection; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction of two elements, unless otherwise specified Limited.
  • the specific meanings of the above terms in the present invention can be understood on a case-by-case basis.
  • the first feature "on” or “below” in the second feature may be the direct contact of the first and second features, or the first and second features are indirectly through the intermediate medium, unless otherwise explicitly stated and defined. contact.
  • the first feature "above”, “above” and “above” the second feature may be that the first feature is directly above or above the second feature, or merely that the first feature level is higher than the second feature.
  • the first feature “below”, “below” and “below” the second feature may be that the first feature is directly below or obliquely below the second feature, or merely that the first feature level is less than the second feature.
  • a battery electrode assembly provided by an embodiment of the present invention.
  • the battery electrode assembly provided in this embodiment includes a cap 11, a conductive sheet 12, an electrode terminal, and at least one temperature memory elastic member 14.
  • the cap 11 is electrically connected to the electrode terminal through a conductive sheet 12, and the temperature memory elastic member 14 is disposed between the electrode terminal and the conductive sheet 12.
  • the temperature memory elastic member 14 elastically extends to the conductive sheet 12 to disconnect the electrical connection between the electrode terminal and the cap 11 when the internal temperature of the battery is higher than the preset temperature control threshold.
  • the temperature memory elastic member 14 can be higher in the internal temperature of the battery than the preset temperature control threshold
  • the elastic extension acts on the conductive sheet 12 to break the electrical connection between the electrode terminal and the cap 11, and the design of the battery electrode assembly improves the overcurrent capability of the battery.
  • the temperature memory elastic member 14 pushes up the conductive sheet 12 to disconnect the electrode terminal from the conductive sheet 12.
  • the trigger condition of the battery electrode assembly for battery protection changes from pressure to temperature, and the temperature is stored by the temperature.
  • the component 14 enhances the breaking force of the conductive sheet 12, ensures the thickness of the conductive sheet 12 under the premise of satisfying the protection of the battery, improves the overcurrent capability of the battery, and optimizes the performance of the battery.
  • the temperature memory elastic element 14 can be at the internal temperature of the battery.
  • the conductive sheet 12 is elastically extended to lift the conductive sheet 12 above the preset temperature control threshold to open the connection point to disconnect the electrode terminal from the cap 11 .
  • the battery electrode assembly utilizes temperature as a condition for triggering the action of the temperature memory elastic member 14, enhances the breaking force of the conductive sheet 12, and effectively protects the internal safety of the battery under the premise of satisfying the protection of the battery, thereby ensuring the safety of the conductive sheet 12.
  • the thickness increases the overcurrent capability of the battery and optimizes the performance of the battery.
  • the conductive sheet 12 is provided with a score
  • the temperature memory elastic member 14 is disposed under the notch of the conductive sheet 12, and the temperature is The memory elastic member 14 is capable of ejecting the weakened score when the internal temperature of the battery is higher than the preset temperature control threshold to disconnect the electrical connection of the electrode terminal from the cap 11.
  • the notched conductive sheet 12 facilitates timely disconnection of the electrical connection between the electrode terminal and the conductive sheet 12 by the temperature memory elastic member 14 when the battery is abnormal, thereby ensuring safety inside the battery.
  • the battery electrode assembly includes a support member 15 disposed between the cap 11 and the conductive sheet 12, and a portion of the conductive sheet 12 is connected to an end surface of the electrode terminal to form a connection point; The scoring is located between the support member 15 and the connection point; as shown in FIGS. 4 and 6, the support member 15 is made of an annular insulating material for fixing the conductive sheet 12, which is advantageous for the temperature memory elastic member 14. When the conductive sheet 12 is extended, the scar of the conductive sheet 12 is better broken; the solution ensures the residual thickness at the notch of the conductive sheet, and improves the overcurrent capability of the battery.
  • the temperature memory elastic member 14 Due to the small space inside the battery, especially the electrode assembly, in order to prevent the temperature memory elastic member 14 from extending when the temperature inside the battery is raised, the temperature memory elastic member 14 is in contact with the cap 11 or the conductive sheet 12 is broken.
  • the opening is turned upside down in contact with the cap 11, and there is a case where the cap and the electrode terminal are substantially uninterrupted and electrically connected.
  • the lower surface of the cap 11 and/or the temperature memory elastic member 14 are provided with an insulating coating, further Preferably, the lower surface of the cap 11 is provided with an insulating coating to prevent the electrically conductive sheet 12 being lifted from coming into contact with the lower surface of the cap 11 to conduct electricity.
  • the electrode assembly comprises a conductive ring, and an outer circumference of the cap and an outer circumference of the conductive sheet are fixedly connected to the conductive ring.
  • the outer end surface of the conductive ring is formed with an L-shaped opening
  • the outer periphery of the conductive sheet is embedded and supported in the L-shaped opening
  • the cap cover is disposed on the conductive ring and is sealingly connected on the outer circumference of the L-shaped opening.
  • the electrical connection between the cap and the conductive sheet is achieved by a conductive ring.
  • the central portion of the conductive sheet is connected to the electrode terminal, and the connection may be located in the central hole of the conductive ring, or may be located above.
  • the center hole of the conductive terminal extending from the conductive ring may be connected to the conductive sheet, or may be located below, for example, the middle portion of the conductive sheet is recessed.
  • the center hole of the conductive ring is connected to the electrode terminal.
  • the central recess of the conductive sheet is connected to the electrode terminal and is generally connected to the end surface of the electrode terminal.
  • the connection can be soldered. Specifically, as shown in FIG. 2, FIG. 3, and FIG. 5, the middle portion of the circular conductive sheet 12 is welded to the middle portion of the end surface of the electrode terminal, and laser welding can be employed.
  • the non-joining portion of the lower surface of the conductive sheet 12 is provided with an insulating coating.
  • the conductive sheet 12 is prevented from being electrically connected to the electrode terminal at other portions than the land, and the action of the temperature memory elastic member 14 is prevented from being broken, and the electrode terminal and the cap 11 are still electrically connected.
  • the position of the temperature memory elastic member 14 is located between the electrode terminal and the conductive sheet, and the conductive sheet can be applied when the temperature is extended.
  • the surface of the electrode terminal is provided with a groove, and the temperature memory elastic member 14 is located. Inside the groove. As shown in FIG. 5, the battery space can be further saved, and the battery capacity can be improved.
  • the temperature memory elastic component 14 can better sense the internal temperature of the battery, and can better act on the conductive sheet, and the sensitivity is further ensured.
  • the performance may specifically be that the upper surface of the electrode terminal has an annular groove near the edge portion, and the temperature memory elastic member is disposed in the annular groove.
  • the temperature memory elastic component 14 is a spring-like memory alloy component, and the deformation temperature of the memory alloy component is preferably set to 60-80 degrees Celsius (° C.), and the memory alloy component material includes but is not limited to Ni-Mn- Ga-Gd alloy or Ni-Mn-Sn alloy. Further, the temperature memory elastic member 14 has a cross-sectional diameter of 2.1 mm, and the temperature memory elastic member 14 has an inner diameter of 10 mm.
  • the preset temperature control threshold that is, the designed battery needs to realize the internal disconnection temperature of the battery, which is related to the battery specification.
  • the preferred preset temperature control valve value of the present invention is 60-80 ° C, further ensuring battery safety.
  • the present invention also provides a cover assembly comprising a cover body 21, an insulating sealing structure, and the battery electrode assembly according to any of the above embodiments, as shown in detail in FIGS. 2 and 5.
  • the cover body 21 is provided with a through hole, the battery electrode assembly is disposed at the through hole, the electrode terminal of the battery electrode assembly extends into the battery, and the electrode terminal and the cover body 21 are insulated by an insulating sealing structure seal.
  • the ceramic ring 232 is specifically used for the insulation sealing.
  • the specific structure may be that the inner ring end of the ceramic ring 232 is connected to the transition ring 233, and the transition ring 233 is connected to the through hole of the cover body 21.
  • the transition ring 233 may be connected to the ceramic ring 232 by ceramic brazing, for example, the transition ring 233 has an inner ring and an outer ring forming a Z-shaped structure, and the cover body 21 is formed with a through hole through which the electrode terminal passes, the through hole
  • the end surface is a stepped structure, and the inner ring of the transition ring 233 is embedded and supported in the step structure.
  • the outer circumference of the conductive ring 231 and the cover body 21 are sealed and connected by the ceramic ring 232, that is, through the cover body 21 and the transition ring 233, and the transition Sealing is achieved by the respective sealing between the ring 233 and the ceramic ring 232, the ceramic ring 232 and the conductive ring 231, and the conductive ring 231 and the conductive sheet 12 and the cap 11.
  • the electrode terminal extends into the interior of the battery to electrically connect with the inner lead-out piece inside the battery, and draws current.
  • the lower surface of the cover body 21 is provided with an injection molded part 234 for isolating and insulating the inner lead piece from the cover body 21.
  • the present invention also provides a battery comprising a battery cell 31 and a cover plate assembly of the above embodiment, the electrode terminal being a positive terminal 33 and/or a negative terminal 32 of the battery.
  • the cover body 21 is provided with two through holes for mounting the positive terminal 33 and the negative terminal 32.
  • the positive electrode and the negative electrode of the present invention may all be the electrode assembly of the above configuration, or any one of them may be the above-described structural electrode assembly.
  • a specific embodiment of the present invention is an electrode assembly in which the negative electrode has the above structure. According to actual needs and actual plans.
  • the battery includes an inner lead-out piece surrounding the edge of the electrode terminal, and the inner lead-out piece is used for electrical connection between the battery core 31 and the electrode terminal. Specific implementations are shown in Figures 3 and 6.
  • Embodiment 1 As shown in FIG. 1 to FIG. 3, when an abnormality such as collision, extrusion, overcharging, internal short circuit, etc. occurs inside the battery, the internal temperature of the battery rises, and when the temperature reaches 60 to 80 degrees Celsius, the temperature memory elasticity The element 14 is deformed and elongated, pushes the conductive sheet 12 upward, the conductive sheet 12 is lifted up, the solder joint 12 is disconnected from the electrode terminal, and the cap 11 is disconnected from the electrode terminal, The positive terminal 33 and/or the negative electrode are disconnected from the cap 11, thereby disconnecting the internal circuit of the battery, cutting off the connection between the abnormal battery and the external normal battery, isolating the normal battery, preventing a greater safety hazard, and effectively preventing The vicious chain reaction caused by abnormal batteries improves the safety of individual batteries and improves the safety factor of the entire battery module.
  • an abnormality such as collision, extrusion, overcharging, internal short circuit, etc.
  • the conductive sheet 12 is not nicked.
  • the design enhances the breaking force of the connection point between the conductive sheet 12 and the electrode terminal through the temperature memory elastic member 14, and the conductive sheet 12 has a strong overcurrent capability under the premise of satisfying the circuit breaker protection. Improves the overcurrent capability inside the battery.
  • the conductive sheet 12 is provided with a support member 15, the conductive sheet 12 is provided with a score on the lower surface, and the temperature memory elastic member 14 is disposed below the score.
  • the temperature memory elastic member 14 is deformed and elongated upward, and the temperature memory elastic member 14 lifts up the conductive sheet 12, and the conductive sheet 12 and the cap 11
  • the support member 15 fixes the conductive sheet 12 under certain conditions.
  • the elastic force of the temperature memory elastic member 14 exceeds a certain value, the scar of the conductive sheet 12 is weakened, and the cap 11 is disconnected from the electrode terminal.
  • the arrangement of the support member 15 facilitates the effective connection of the temperature memory elastic member 14 to the connection of the electrode terminal to the cap 11. This design is used by the temperature memory elastic member 14 in cooperation with the support member 15 to enhance the temperature memory elastic member 14
  • the breaking force of the weak portion of the conductive sheet 12 ensures the thickness of the conductive sheet 12, so that the conductive sheet 12 has a strong overcurrent capability, improves the overcurrent capability inside the battery, and optimizes battery performance.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

L'invention concerne un ensemble d'électrodes de batterie et un ensemble plaque de recouvrement, et une batterie. En fournissant un élément élastique à mémoire de température entre une borne d'électrode et une feuille conductrice, l'élément élastique à mémoire de température peut s'étendre élastiquement pour agir sur la feuille conductrice pour une déconnexion électrique entre la borne d'électrode et un capuchon lorsqu'une température interne d'une batterie est supérieure à une valeur de seuil de commande de température prédéfinie. Lorsqu'une anomalie de collision, d'extrusion, de surcharge, de court-circuit interne, etc. se produit à l'intérieur de la batterie, et lorsque la température interne de la batterie s'élève et que la température atteint 60 à 80 degrés Celsius, l'élément élastique à mémoire de température se déforme et s'étend pour faciliter la feuille conductrice à se déconnecter de la borne d'électrode, de manière à réaliser la déconnexion d'un circuit interne de la batterie. L'ensemble d'électrodes de batterie change une condition de déclenchement pour une protection de batterie d'une intensité de pression à une température, augmente, au moyen de l'élément élastique à mémoire de température, une force de rupture à la feuille conductrice, et assure, lorsque la condition de protection de batterie est satisfaite, l'épaisseur de la feuille conductrice, ce qui permet d'améliorer la capacité de surintensité de la batterie et d'optimiser les performances de la batterie.
PCT/CN2017/117409 2017-02-27 2017-12-20 Ensemble d'électrodes de batterie et ensemble plaque de recouvrement, et batterie WO2018153156A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CN201710110189.3 2017-02-27
CN201720182208.9U CN206685462U (zh) 2017-02-27 2017-02-27 一种电池电极组件、盖板组件及电池
CN201710110189.3A CN108511670B (zh) 2017-02-27 2017-02-27 一种电池电极组件、盖板组件及电池
CN201720182208.9 2017-02-27

Publications (1)

Publication Number Publication Date
WO2018153156A1 true WO2018153156A1 (fr) 2018-08-30

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PCT/CN2017/117409 WO2018153156A1 (fr) 2017-02-27 2017-12-20 Ensemble d'électrodes de batterie et ensemble plaque de recouvrement, et batterie

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WO (1) WO2018153156A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112133879A (zh) * 2020-11-02 2020-12-25 深圳市嘉姆特科技有限公司 一种新结构的电池注塑端子
CN112952280A (zh) * 2019-12-11 2021-06-11 三星Sdi株式会社 电池

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1252170A (zh) * 1997-04-10 2000-05-03 杜拉塞尔公司 电化学电池用的断流器
CN205752364U (zh) * 2016-05-17 2016-11-30 比亚迪股份有限公司 电池保护装置、盖板组件及电池
CN206685462U (zh) * 2017-02-27 2017-11-28 比亚迪股份有限公司 一种电池电极组件、盖板组件及电池

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1252170A (zh) * 1997-04-10 2000-05-03 杜拉塞尔公司 电化学电池用的断流器
CN205752364U (zh) * 2016-05-17 2016-11-30 比亚迪股份有限公司 电池保护装置、盖板组件及电池
CN206685462U (zh) * 2017-02-27 2017-11-28 比亚迪股份有限公司 一种电池电极组件、盖板组件及电池

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112952280A (zh) * 2019-12-11 2021-06-11 三星Sdi株式会社 电池
CN112952280B (zh) * 2019-12-11 2023-07-25 三星Sdi株式会社 电池
CN112133879A (zh) * 2020-11-02 2020-12-25 深圳市嘉姆特科技有限公司 一种新结构的电池注塑端子

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