WO2021195852A1 - Ensemble batterie et batterie, et dispositif électronique l'utilisant - Google Patents

Ensemble batterie et batterie, et dispositif électronique l'utilisant Download PDF

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Publication number
WO2021195852A1
WO2021195852A1 PCT/CN2020/082118 CN2020082118W WO2021195852A1 WO 2021195852 A1 WO2021195852 A1 WO 2021195852A1 CN 2020082118 W CN2020082118 W CN 2020082118W WO 2021195852 A1 WO2021195852 A1 WO 2021195852A1
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WO
WIPO (PCT)
Prior art keywords
battery assembly
active layer
area
pole piece
tab
Prior art date
Application number
PCT/CN2020/082118
Other languages
English (en)
Chinese (zh)
Inventor
连旭宸
江行国
李�瑞
徐炎
Original Assignee
宁德新能源科技有限公司
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 宁德新能源科技有限公司 filed Critical 宁德新能源科技有限公司
Priority to PCT/CN2020/082118 priority Critical patent/WO2021195852A1/fr
Priority to CN202080099221.2A priority patent/CN115380397A/zh
Publication of WO2021195852A1 publication Critical patent/WO2021195852A1/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
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • 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

  • This application relates to the field of battery technology, and in particular to a battery assembly, a battery and an electronic device using the battery assembly.
  • Secondary batteries are increasingly used in various fields.
  • Secondary batteries generally include jelly-roll electrode assemblies or stacked electrode assemblies.
  • the structure of the jelly-roll electrode assembly has the following structure: the length of the active material
  • the plate-shaped positive electrode and the long plate-shaped negative electrode are wound in a state where the separator is arranged between the positive electrode and the negative electrode;
  • the structure of the stacked electrode assembly has the following structure: The states between the positive electrode and the negative electrode are successively stacked.
  • An embodiment of the present application provides a battery assembly, including:
  • a first pole piece the first pole piece includes a first current collector and a first active layer, and the first active layer is disposed on the surface of the first current collector;
  • a first area, the first area is disposed at one end of the battery assembly, and the thickness of the first active layer in the first area is h1;
  • a second area extends from the first area, the thickness of the first active layer in the second area is h2, and h1 is smaller than h2;
  • a flat member the flat member is disposed in the first area, and the flat member is disposed on a surface of the first active layer away from the first current collector.
  • the flat member is disposed in the first area to fill the step difference between the first area and the second area caused by the inconsistent thickness of the active layer, and at least part of the flat member is disposed in the first area to improve the overall flatness of the battery assembly.
  • the flat member is disposed on the surface of the first active layer at the outermost periphery of the battery assembly.
  • the flat piece is attached to the outermost side of the battery assembly, on the one hand, it can prevent lithium from piercing the battery packaging bag and cause liquid leakage, on the other hand, it can reduce the processing difficulty.
  • the flat member is an insulating material.
  • the flat piece of insulating material can prevent lithium from piercing the battery packaging bag to form a short circuit.
  • the battery assembly further includes a second pole piece, the second pole piece includes a second current collector and a second active layer, and the second active layer is disposed on the second current collector.
  • the thickness of the second active layer in the first area is h3
  • the thickness of the second active layer in the second area is h4
  • h3 is smaller than h4
  • the flat member is disposed on the The second active layer is far away from the surface of the second current collector.
  • the number of the first pole piece and the second pole piece is multiple, and a plurality of the first pole piece and the second pole piece are sequentially arranged at intervals, and the flat piece It is arranged between at least two spaced first pole pieces and second pole pieces.
  • the ratio of the length of the first pole piece located in the first region to the length of the first pole piece is 5%-30%.
  • the ratio of the length of the first pole piece located in the first region to the length of the first pole piece is 10%-20%.
  • the ratio of the length of the first pole piece located in the first region to the length of the first pole piece is 20%.
  • the length of the first pole piece located in the first area is 4-10 mm.
  • the length of the first pole piece located in the first area is 8 mm.
  • the thickness of the first active layer gradually increases or gradually decreases along the width direction of the battery assembly.
  • the battery assembly further includes a first tab, the first tab being disposed at an end of the battery assembly adjacent to the first region in the width direction of the battery pack, The first tab is connected to the first area.
  • the flat member covering at least part of the first tab can enhance the protection of the first tab.
  • the first tab is formed by extending the first tab, and the flat member at least partially covers a portion of the first tab close to the first region.
  • the battery assembly is L-shaped.
  • a battery includes the aforementioned battery assembly.
  • An electronic device includes the aforementioned battery.
  • the flat member of the present application is provided in the first area to fill the step difference between the first area and the second area caused by the inconsistent thickness of the active layer, and at least part of the flat member is provided in the first area
  • the battery assembly is fully compressed during the production process, and the safety performance of the battery assembly is further improved.
  • FIG. 1 is a schematic plan view of a battery core according to the first embodiment of the application.
  • FIG. 2 is a schematic cross-sectional view of the battery core according to the first embodiment of the application.
  • FIG. 3 is a schematic plan view of the battery core according to the second embodiment of the application.
  • FIG. 4 is a schematic cross-sectional view of the battery core according to the second embodiment of the application.
  • Fig. 5 is a schematic plan view of a battery according to a third embodiment of the application.
  • FIG. 6 is a three-dimensional schematic diagram of an electronic device according to a fourth embodiment of the application.
  • Packaging film 301
  • a battery assembly 10 provided by the first embodiment of this application.
  • a battery assembly 10 includes a first pole piece 11, a second pole piece 12, a first tab 13, a second tab 14, a flat member 15, an isolation film 16, a first area 17 and a second area 18.
  • the number of the first pole piece 11 and the second pole piece 12 is multiple, and the multiple first pole pieces 11 and the second pole piece 12 can be arranged in a manner of winding, lamination, or lamination winding.
  • the first pole piece 11 and the second pole piece 12 can be stacked in sequence at intervals, and the isolation film 16 is arranged between the first pole piece 11 and the second pole piece 12 arranged at intervals.
  • the first tab 13 is connected to the first pole piece 11, and the second tab 14 is connected to the second pole piece 12.
  • the battery assembly 10 is an L-shaped battery cell structure, the battery assembly 10 is L-shaped, and the first tab 13 and the second tab 14 are disposed at one end of the L-shaped battery assembly 10, for example, a battery The end of the short side of the assembly 10.
  • the first pole piece 11 includes a first current collector 111 and a first active layer 112, and the first active layer 112 is disposed on the surface of the first current collector 111.
  • the first current collector 111 may be a material with good conductivity and ductility, such as copper foil or aluminum foil.
  • the thickness of the first active layer 112 disposed on the same surface of the first current collector 111 is not uniform.
  • the second pole piece 12 includes a second current collector 121 and a second active layer 122, and the second active layer 122 is disposed on the surface of the second current collector 121.
  • the second current collector 121 may be a material with good conductivity and ductility, such as copper foil or aluminum foil.
  • the thickness of the second active layer 122 disposed on the same surface of the second current collector 121 is not uniform.
  • the first area 17 is disposed at one end of the battery assembly 10, and the second area 18 extends from the first area 17.
  • the area of the battery assembly 10 corresponding to the first pole piece 11 and the second pole piece 12 can be divided into two connected parts, the first area 17 and the second area 18.
  • the thickness of the first active layer 112 in the first region 17 is h1
  • the thickness of the first active layer 112 in the second region 18 is h2, and h1 is less than h2; that is, for the same first set For the first active layer 112 on the same surface of the fluid 111, the first active layer 112 located in the first region 17 has a smaller thickness than the first active layer 112 located in the second region 18.
  • the thickness of the second active layer 122 in the first region 17 is h3, the thickness of the second active layer 122 in the second region 18 is h4, and h3 is less than h4; that is, for the same second set For the second active layer 122 on the same surface of the fluid 121, the second active layer 122 located in the first region 17 has a smaller thickness than the second active layer 122 located in the second region 18.
  • the thickness of the first active layer 112 gradually increases or decreases along the width direction of the battery assembly 10. In this embodiment, gradually decreases toward the outside of the battery along the width direction of the battery assembly 10.
  • the thickness of the second active layer 122 gradually increases or decreases along the width direction of the battery assembly 10. In this embodiment, the thickness of the first active layer 112 gradually decreases toward the outside of the battery along the width direction of the battery assembly 10.
  • the first area 17 may be located at the head of the battery assembly 10.
  • the length of the first pole piece 11 located in the first area 17 is equal to the total length of the first pole piece 11.
  • the ratio is 5%-30%, and the ratio of the length of the second pole piece 12 located in the first area 17 to the total length of the second pole piece 12 is 5%-30%; in other embodiments, the length of the second pole piece 12 is located in the first area
  • the ratio of the length of the first pole piece 11 of 17 to the total length of the first pole piece 11 is 10%-20% or 20%.
  • the ratio of the total length is 10%-20% or 20%.
  • the optional length of the first pole piece 11 located in the first region 17 is 4-10mm, preferably 8mm; the second pole located in the first region 17
  • the optional length of the sheet 12 is 4-10 mm, preferably 8 mm.
  • the first tab 13 and the second tab 14 are disposed at one end of the battery assembly 10 adjacent to the first region 17 in the width direction of the battery assembly 10, and the first tab 13 and the second tab 14 are connected to the first region 17.
  • the first tab 13 and the second tab 14 are spaced apart, and the first tab 13 may include a plurality of first tab units 131, and one first tab unit 131 consists of a first current collector 111
  • a plurality of first tab units 131 are stacked or wound to form a first tab 13
  • the second tab 14 includes a plurality of second tab units 141, and one second tab unit 141 consists of a second current collector 121 is formed by extension, and a plurality of second tab units 141 are stacked or wound to form the second tab 14.
  • the flat member 15 is disposed in the first region 17, the flat member 15 is disposed on the outermost periphery of the battery assembly 10, and the flat member 15 is disposed on the surface of the first active layer 112 away from the first current collector 111 Specifically, the outermost layer of the battery assembly 10 is the first pole piece 11, and the flat member 15 is disposed on the surface of the first active layer 112 located on the outermost layer.
  • the flat member 15 is made of insulating material, and specifically may be green glue.
  • the number of the flat members 15 is two.
  • the two flat members 15 are respectively disposed on opposite sides of the battery assembly 10, and the flat members 15 are disposed on the two sides for filling the first area 17 and the second area.
  • the region 18 is caused by the inconsistency of the active layer thickness.
  • At least part of the flat member 15 is provided in the first region 17 to improve the overall flatness of the battery assembly 10, so that the battery assembly 10 is fully compressed during the manufacturing process, and further improves the battery Safety performance of component 10.
  • the flat member 15 at least partially covers the portions of the first tab 13 and the second tab 14 close to the first region 17.
  • the size of the flat member 15 may be the same as the area of the first region 17, or the area of the flat member 15 may be slightly larger than the area of the first region 17.
  • the length and width of the flat member 15 may be greater than the length of the first region 17 respectively.
  • the width, the difference part can be 0.4mm.
  • a battery assembly 20 provided by the first embodiment of this application.
  • a battery assembly 20 includes a first pole piece 21, a second pole piece 22, a first pole tab 23, a second pole tab 24, a flat member 25, an isolation membrane 26, a first region 27 and a second region 28.
  • the number of the first pole piece 21 and the second pole piece 22 is multiple, and the multiple first pole pieces 21 and the second pole piece 22 can be arranged in a manner of winding, lamination, or lamination winding.
  • the first pole piece 21 and the second pole piece 22 can be stacked in sequence at intervals, and the isolation film 26 is arranged between the first pole piece 21 and the second pole piece 22 arranged at intervals.
  • the first tab 23 is connected to the first pole piece 21, and the second tab 24 is connected to the second pole piece 22.
  • the battery assembly 20 is an L-shaped battery cell structure, the battery assembly 20 is L-shaped, and the first tab 23 and the second tab 24 are disposed at one end of the L-shaped battery assembly 20, for example, a battery The end of the short side of the component 20.
  • the first pole piece 21 includes a first current collector 211 and a first active layer 212, and the first active layer 212 is disposed on the surface of the first current collector 211.
  • the first current collector 211 may be a material with good conductivity and ductility, such as copper foil or aluminum foil.
  • the thickness of the first active layer 212 disposed on the same surface of the first current collector 211 is not uniform.
  • the second pole piece 22 includes a second current collector 221 and a second active layer 222, and the second active layer 222 is disposed on the surface of the second current collector 221.
  • the second current collector 221 may be a material with good conductivity and ductility, such as copper foil or aluminum foil.
  • the thickness of the second active layer 222 disposed on the same surface of the second current collector 221 is uneven.
  • the first area 27 is disposed at one end of the battery assembly 20, and the second area 28 extends from the first area 27.
  • the area of the battery assembly 20 corresponding to the first pole piece 21 and the second pole piece 22 can be divided into two connected parts, the first area 27 and the second area 28.
  • the thickness of the first active layer 212 in the first region 27 is h1
  • the thickness of the first active layer 212 in the second region 28 is h2, and h1 is less than h2; that is, for the same first set For the first active layer 212 on the same surface of the fluid 211, the first active layer 212 located in the first region 27 has a smaller thickness than the first active layer 212 located in the second region 28.
  • the thickness of the second active layer 222 in the first region 27 is h3, the thickness of the second active layer 222 in the second region 28 is h4, and h3 is smaller than h4; that is, for the same second set For the second active layer 222 on the same surface of the fluid 221, the second active layer 222 located in the first region 27 has a smaller thickness than the second active layer 222 located in the second region 28.
  • the thickness of the first active layer 212 gradually increases or decreases along the width direction of the battery assembly 20. In this embodiment, the thickness of the first active layer 212 gradually decreases toward the outside of the battery along the width direction of the battery assembly 20.
  • the thickness of the second active layer 222 gradually increases or gradually decreases along the width direction of the battery assembly 20.
  • the thickness of the first active layer 212 gradually decreases toward the outside of the battery along the width direction of the battery assembly 20.
  • the first area 27 may be located at the head of the battery assembly 20.
  • the length of the first pole piece 21 located in the first area 27 is equal to the total length of the first pole piece 21.
  • the ratio is 5%-30%, and the ratio of the length of the second pole piece 22 located in the first area 27 to the total length of the second pole piece 22 is 5%-30%; in other embodiments, it is located in the first area
  • the ratio of the length of the first pole piece 21 of 27 to the total length of the first pole piece 21 is 10%-20% or 20%.
  • the ratio of the total length is 10%-20% or 20%.
  • the optional length of the first pole piece 21 located in the first region 27 is 4-10mm, preferably 8mm; the second pole located in the first region 27
  • the optional length of the sheet 22 is 4-10 mm, preferably 8 mm.
  • the first tab 23 and the second tab 24 are disposed at one end of the battery assembly 20 adjacent to the first region 27 in the width direction of the battery assembly 20, and the first tab 23 and the second tab 24 are connected to the first region 27.
  • the first tab 23 and the second tab 24 are spaced apart, the first tab 23 may include a plurality of first tab units 231, and one first tab unit 231 consists of a first current collector 211 In an extended form, a plurality of first tab units 231 are stacked or wound to form a first tab 23.
  • the second tab 24 includes a plurality of second tab units 241.
  • One second tab unit 241 consists of a second current collector. 221 is extended and formed, and a plurality of second tab units 241 are stacked or wound to form the second tab 24.
  • the flat member 25 is an insulating material, and specifically may be green glue. In one embodiment, at least part of the flat member 25 is disposed in the first region 27, the number of the flat member 15 is multiple, and the flat member 25 is disposed on at least two first pole pieces 21 and second pole pieces that are arranged at intervals. Between 22, the flat member 25 is disposed on the surface of the first active layer 212 away from the first current collector 211 and the surface of the second active layer 222 away from the second current collector 221. The flat member 25 is used to fill the step difference between the first area 27 and the second area 28 caused by the inconsistency of the active layer thickness. At least part of the flat member 25 is disposed in the first area 27 to improve the overall flatness of the battery assembly 20, so that the battery assembly 20 is fully compressed during the manufacturing process, which further improves the safety performance of the battery assembly 20.
  • the flat member 25 at least partially covers the portions of the first tab 23 and the second tab 24 close to the first region 27.
  • the size of the flat member 25 may be the same as the area of the first region 27, or the area of the flat member 25 may be slightly larger than the area of the first region 27.
  • the length and width of the flat member 25 may be greater than the length of the first region 27, respectively.
  • the width, the difference part can be 0.4mm.
  • FIG. 5 it is a three-dimensional schematic diagram of the battery 3 provided by the third embodiment of this application.
  • the battery 3 includes a battery assembly 30 and a packaging film 301 that wraps the battery assembly 30.
  • the battery 3 is filled with electrolyte, and the electrolyte infiltrates the battery assembly 30.
  • FIG. 6 it is a three-dimensional schematic diagram of the electronic device 1 provided by the fourth embodiment of this application.
  • the present application also provides an electronic device 1, which includes a main body 101 and a battery 3 arranged in the main body 101.
  • the electronic device 1 is a mobile phone as an example.
  • the electronic device 1 may also be a personal computer, a smart home appliance, an industrial controller, an electric vehicle, a hybrid vehicle, etc.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Battery Electrode And Active Subsutance (AREA)

Abstract

L'invention concerne un ensemble batterie (10, 20, 30), comprenant : des premières feuilles d'électrode (11, 21), chaque première feuille d'électrode (11, 21) comprenant un premier collecteur de courant (111, 211) et une première couche active (112, 212), la première couche active (112, 212) étant disposée sur la surface du premier collecteur de courant (111, 211) ; une première zone (17, 27), la première zone (17, 27) étant disposée au niveau d'une extrémité de l'ensemble batterie (10, 20, 30), et l'épaisseur de la première couche active (112, 212) située dans la première zone (17, 27) étant h1 ; une seconde zone (18, 28), la deuxième zone (18, 28) s'étendant à partir de la première zone (17, 27), l'épaisseur de la première couche active (112, 212) située dans la seconde zone (18, 28) étant h2, et h1 étant inférieur à h2 ; et un élément plat (15, 25), l'élément plat (15, 25) étant disposé dans la première zone (17, 27), et l'élément plat (15, 25) étant disposé sur la surface de la première couche active (112, 212) à l'opposé du premier collecteur de courant (111, 211). L'invention concerne également une batterie (3) et un dispositif électronique (1) utilisant l'ensemble batterie (10, 20, 30). L'ensemble batterie (10, 20, 30) peut améliorer la planéité et réduire les risques de sécurité.
PCT/CN2020/082118 2020-03-30 2020-03-30 Ensemble batterie et batterie, et dispositif électronique l'utilisant WO2021195852A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/CN2020/082118 WO2021195852A1 (fr) 2020-03-30 2020-03-30 Ensemble batterie et batterie, et dispositif électronique l'utilisant
CN202080099221.2A CN115380397A (zh) 2020-03-30 2020-03-30 电池组件、应用所述电池组件的电池及电子装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2020/082118 WO2021195852A1 (fr) 2020-03-30 2020-03-30 Ensemble batterie et batterie, et dispositif électronique l'utilisant

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WO2021195852A1 true WO2021195852A1 (fr) 2021-10-07

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PCT/CN2020/082118 WO2021195852A1 (fr) 2020-03-30 2020-03-30 Ensemble batterie et batterie, et dispositif électronique l'utilisant

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WO (1) WO2021195852A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023097614A1 (fr) * 2021-12-02 2023-06-08 东莞新能源科技有限公司 Batterie et dispositif électronique
WO2024026851A1 (fr) * 2022-08-05 2024-02-08 宁德时代新能源科技股份有限公司 Cellule de batterie, batterie et dispositif électrique

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1702886A (zh) * 2004-05-25 2005-11-30 三星Sdi株式会社 二次电池
CN102956863A (zh) * 2011-08-18 2013-03-06 三星Sdi株式会社 二次电池
CN105453329A (zh) * 2013-08-09 2016-03-30 Nec能源元器件株式会社 二次电池及其制造方法
CN105706275A (zh) * 2013-10-30 2016-06-22 日产自动车株式会社 电极及具有电极的电池
CN107210494A (zh) * 2015-01-30 2017-09-26 Nec 能源元器件株式会社 二次电池
WO2018021214A1 (fr) * 2016-07-28 2018-02-01 三洋電機株式会社 Batterie rechargeable et son procédé de fabrication

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1702886A (zh) * 2004-05-25 2005-11-30 三星Sdi株式会社 二次电池
CN102956863A (zh) * 2011-08-18 2013-03-06 三星Sdi株式会社 二次电池
CN105453329A (zh) * 2013-08-09 2016-03-30 Nec能源元器件株式会社 二次电池及其制造方法
CN105706275A (zh) * 2013-10-30 2016-06-22 日产自动车株式会社 电极及具有电极的电池
CN107210494A (zh) * 2015-01-30 2017-09-26 Nec 能源元器件株式会社 二次电池
WO2018021214A1 (fr) * 2016-07-28 2018-02-01 三洋電機株式会社 Batterie rechargeable et son procédé de fabrication

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023097614A1 (fr) * 2021-12-02 2023-06-08 东莞新能源科技有限公司 Batterie et dispositif électronique
WO2024026851A1 (fr) * 2022-08-05 2024-02-08 宁德时代新能源科技股份有限公司 Cellule de batterie, batterie et dispositif électrique

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