WO2024045276A1 - Élément de batterie, batterie et dispositif électrique - Google Patents

Élément de batterie, batterie et dispositif électrique Download PDF

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Publication number
WO2024045276A1
WO2024045276A1 PCT/CN2022/125090 CN2022125090W WO2024045276A1 WO 2024045276 A1 WO2024045276 A1 WO 2024045276A1 CN 2022125090 W CN2022125090 W CN 2022125090W WO 2024045276 A1 WO2024045276 A1 WO 2024045276A1
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WO
WIPO (PCT)
Prior art keywords
plug
battery cell
battery
connector
cell according
Prior art date
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PCT/CN2022/125090
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English (en)
Chinese (zh)
Inventor
梁加浩
杨彦超
唐代春
Original Assignee
宁德时代新能源科技股份有限公司
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Publication of WO2024045276A1 publication Critical patent/WO2024045276A1/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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • 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
    • 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
    • H01M50/60—Arrangements or processes for filling or topping-up with liquids; Arrangements or processes for draining liquids from casings
    • H01M50/673—Containers for storing liquids; Delivery conduits therefor
    • H01M50/682—Containers for storing liquids; Delivery conduits therefor accommodated in battery or cell casings
    • 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
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present application relates to the technical field of secondary batteries, and in particular to a battery cell, a battery and an electrical device.
  • Secondary batteries are generally divided into stacked structures or rolled structures.
  • the pole pieces need to be wound, and hot or cold pressed after winding.
  • lithium precipitation is likely to occur due to inconsistent gaps between the pole pieces at the corners, affecting the normal use of the secondary battery.
  • an embodiment of the present application provides a battery cell, including: an electrode assembly, the electrode assembly includes a straight portion and bent portions provided on both sides of the straight portion along a first direction; and a plug connector. The assembly is inserted between two adjacent layers of pole pieces in the bent portion on at least one side along the winding axis direction of the electrode assembly.
  • the plug-in assembly is inserted between two adjacent layers of pole pieces in the bent portion of the electrode assembly along the winding axis direction of the electrode assembly. Since the plug-in assembly occupies a certain space in the bent portion, , it is possible to maintain a certain gap between two adjacent layers of pole pieces in the bent part, reduce the risk of lithium precipitation between two adjacent layers of pole pieces, and improve the reliability of the battery cells.
  • the plug-in assembly includes a plurality of plug-in connectors, and each plug-in connector is inserted between two adjacent layers of pole pieces in the bent portion.
  • each plug-in connector is inserted between two adjacent layers of pole pieces in the bent portion.
  • the plug component further includes a fixing base, the fixing base extends along the first direction, and one end of each plug connector protrudes outside the bending portion and is connected to the fixing base. By protruding one end of each plug-in connector out of the bending portion and connecting it to the fixed base, the position of each plug-in connector is kept fixed relative to the electrode assembly and does not move in the electrode assembly.
  • the length of the plug connector protruding out of the bending portion is no more than 5 millimeters (mm). This design enables an appropriate gap to be maintained between the holder and the electrode assembly, which reduces the overall space occupied by the battery cell without affecting the normal use of the electrode assembly.
  • the plug connectors are arranged side by side along the first direction on the fixed base, and two adjacent plug connectors are spaced apart from each other.
  • the arrangement direction of the plug-in connectors is kept parallel to the arrangement direction of the bending portion. In this way, each plug-in connector can be evenly inserted on the fixed base.
  • the gaps between the pole pieces in the bent part are made more uniform.
  • the projected outline of the plug connector on the surface of the fixing base is circular, linear, folded or arc-shaped.
  • the plug connector is provided with a plurality of liquid storage holes.
  • the liquid storage hole on the connector can absorb and store the electrolyte through capillary phenomenon, so that the electrolyte can diffuse between the two adjacent layers of pole pieces with the help of the connector, ensuring that the bent part can be wetted by the electrolyte, further Reduce the risk of lithium precipitation in electrode components.
  • the liquid storage hole includes a through hole and/or a blind hole.
  • Providing through holes on the connector can serve as a storage space and transmission channel for the electrolyte, while providing blind holes can serve as a storage space for the electrolyte, allowing the connector to absorb the electrolyte and wet the bent portion.
  • the diameter of the liquid storage hole is greater than or equal to 1 micrometer ( ⁇ m) and less than or equal to 10 micrometer ( ⁇ m). Properly setting the diameter of the liquid storage hole not only facilitates the arrangement of the liquid storage hole, but also enables the connector to absorb enough electrolyte to ensure the infiltration effect on the bending part.
  • the porosity of the plug connector is greater than or equal to 30% and less than or equal to 50%. Properly setting the porosity of the plug connector not only facilitates the processing of the plug connector, but also enables the plug connector to absorb enough electrolyte to ensure the infiltration effect on the bending part.
  • the connector is made of polyethylene or polypropylene. This design makes the connector have excellent physical and chemical properties, is easy to process and manufacture, and has low cost.
  • a diaphragm is provided between two adjacent layers of pole pieces in the bent portion, and the plug-in component is inserted between the pole pieces and the diaphragm.
  • the plug component is attached to the side of its corresponding pole piece facing the bending center of the bending portion.
  • the plug-in component is brought into contact with the depression of the corresponding pole piece in the bending part, thereby avoiding the center of the bending part. Stress concentration occurs on the pole pieces, which reduces the risk of lithium precipitation on the pole pieces and improves the reliability of the battery cells.
  • an embodiment of the present application also provides a battery, including: a box; and a plurality of battery cells as described above, and the battery cells are accommodated in the box.
  • the plug-in component is inserted between two adjacent layers of pole pieces in the bent part of the electrode assembly. Since the plug-in component occupies a certain space in the bent part, it can This allows a certain gap to be maintained between two adjacent layers of pole pieces in the bent portion, thereby reducing the risk of lithium precipitation between the two adjacent layers of pole pieces and improving the reliability of the battery cells.
  • an embodiment of the present application also provides an electrical device, including: the above-mentioned battery, and the battery is used to provide electric energy.
  • the above-mentioned electric device uses the above-mentioned battery to provide electric energy. Since the battery has high reliability, the safety of the electric device is also higher.
  • Figure 1 is a schematic diagram of the overall structure of a vehicle provided by an embodiment of the present application.
  • Figure 2 is an exploded view of the overall structure of a battery provided by an embodiment of the present application.
  • Figure 3 is a cross-sectional view of the overall structure of a battery cell provided by an embodiment of the present application.
  • Figure 4 is a partial enlarged schematic diagram of position A in Figure 3;
  • Figure 5 is a schematic structural diagram of a plug-in assembly in a battery cell according to an embodiment of the present application.
  • Figure 6 is a schematic structural diagram of a plug-in assembly in a battery cell according to another embodiment of the present application.
  • Figure 7 is a schematic structural diagram of a plug-in component in a battery cell according to another embodiment of the present application.
  • Electrode assembly 111: Straight part, 112: Bent part, 113: Pole piece, 114: Diaphragm;
  • an embodiment means that a particular feature, structure or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application.
  • the appearances of this phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those skilled in the art understand, both explicitly and implicitly, that the embodiments described herein may be combined with other embodiments.
  • multiple refers to more than two (including two).
  • multiple groups refers to two or more groups (including two groups), and “multiple pieces” refers to It is more than two pieces (including two pieces).
  • Power batteries are not only used in energy storage power systems such as hydraulic, thermal, wind and solar power stations, but also widely used in electric bicycles and electric motorcycles. vehicles, electric vehicles and other electric vehicles, as well as military equipment and aerospace and other fields. As the application fields of power batteries continue to expand, the safety of batteries during use has gradually become the focus of attention.
  • the pole pieces need to be wound during the manufacturing process. During the hot pressing or cold pressing shaping process after winding, it is easy to cause the pole pieces to The lithium precipitation phenomenon caused by inconsistent gaps at the corners affects the normal use of secondary batteries.
  • the applicant has designed a battery cell after in-depth research.
  • the connector assembly is inserted between two adjacent layers of pole pieces in the bent portion of the electrode assembly along the direction of the winding axis of the electrode assembly. Since the connector assembly occupies a certain space in the bent portion, the center of the bent portion can be A certain gap is maintained between two adjacent layers of pole pieces to reduce the risk of lithium precipitation between two adjacent layers of pole pieces and improve the reliability of the battery cells.
  • the battery cells disclosed in the embodiments of this application are used in batteries. Batteries equipped with the battery cells disclosed in the embodiments of this application are used. Since a certain gap is maintained between two adjacent layers of pole pieces, the energy consumption of the two adjacent layers of poles is reduced. There is no risk of lithium precipitation between chips, and the battery has high reliability.
  • Embodiments of the present application provide an electrical device that uses a battery as a power source.
  • the electrical device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric vehicle, a ship, a spacecraft, etc.
  • electric toys can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, electric airplane toys, etc.
  • spacecraft can include airplanes, rockets, space shuttles, spaceships, etc.
  • FIG. 1 is a schematic diagram of the overall structure of a vehicle provided by an embodiment of the present application.
  • the vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle, where the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc.
  • the battery 10 is disposed inside the vehicle, and the battery 10 can be disposed at the bottom, head, or tail of the vehicle.
  • the battery 10 may be used to power a vehicle.
  • the battery 10 may be used as an operating power source for the vehicle.
  • the vehicle may also include a controller and a motor, and the controller is used to control the battery 10 to provide power to the motor, for example, for starting, navigating and driving the vehicle to meet its power requirements.
  • the battery 10 can not only be used as the operating power source of the vehicle, but also can be used as the driving power source of the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.
  • FIG. 2 is an exploded view of the overall structure of the battery 10 provided by one embodiment of the present application.
  • the battery 10 composed of battery cells 100 can be used as a power supply system of the electrical device 1 , and several battery cells 100 are arranged in the box 200 .
  • the battery cell 100 refers to the smallest unit that makes up the battery 10.
  • the multiple battery cells 100 can be connected in series or in parallel or in a mixed connection.
  • a mixed connection refers to multiple batteries. There are both series and parallel connections in the unit 100.
  • Multiple battery cells 100 can be directly connected in series or in parallel or mixed together to form a battery module, and be accommodated in the box 200 of the battery 10; of course, multiple battery cells 100 can also be connected in series or in parallel or A battery module is formed by mixed connection, and multiple battery modules are connected in series, parallel, or mixed to form a battery module, and are accommodated in the box 200 of the battery 10 .
  • the box 200 is used to provide an accommodation space for the battery cells 100, and the box 200 can adopt a variety of structures.
  • the box 200 may include a bottom plate and several side plates.
  • the several side plates are connected end to end with each other.
  • the bottom plate is connected to the bottom of each side plate and together with the side plates, it surrounds a space for accommodating the battery cells 100 .
  • the accommodation space that is, the bottom plate and the side plates are surrounded to form an accommodation groove.
  • the receiving groove formed by the bottom plate and the side plate can be in various shapes, such as cylinder, rectangular parallelepiped, etc.
  • Figure 3 is a cross-sectional view of the overall structure of the battery cell 100 provided by one embodiment of the present application.
  • Figure 4 is a partial enlarged schematic view of position A in Figure 3.
  • Figure 5 is An embodiment of the present application provides a schematic structural diagram of the plug assembly 120 in the battery cell 100 .
  • the embodiment of the present application provides a battery cell 100.
  • the battery cell 100 includes an electrode assembly 110 and a plug assembly 120.
  • the electrode assembly 110 includes a straight portion 111 and is disposed on both sides of the straight portion 111 along the first direction a.
  • the bending part 112; the plug component 120 is inserted between two adjacent layers of pole pieces 113 in the bending part 112 on at least one side along the winding axis direction of the electrode assembly 110.
  • Each battery cell 100 may be a secondary battery or a primary battery, or may be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto.
  • the battery cell 100 may be in the shape of a cylinder, a flat body, a rectangular parallelepiped or other shapes.
  • the electrode assembly 110 is formed by rolling the pole piece 113.
  • the electrode assembly 110 includes a straight portion 111 that remains in a straight state, and a bent portion 112 that is bent after being wound.
  • the bent portion 112 is formed along the
  • the first direction a is provided on both sides of the straight portion 111 , and the first direction a can be flexibly set according to the installation requirements of the electrode assembly 110 .
  • the first direction a may be the longitudinal extension direction of the pole piece 113 , that is, after winding the two ends of the pole piece 113 several times along its longitudinal extension direction, the straight portion 111 and the straight portion 111 along the first direction are formed.
  • One direction a is provided on the bent portions 112 on both sides of the straight portion.
  • the number of windings of the electrode assembly 110 is not limited and can be multiple times, and the bending angle of each bending portion 112 is not limited.
  • the pole pieces 113 are at least two layers.
  • the at least two layers of pole pieces 113 include a positive electrode piece and a negative electrode piece.
  • the positive electrode piece includes a positive electrode current collector and a positive electrode active material layer coated on the surface of the positive electrode current collector.
  • the negative electrode The pole piece includes a negative electrode current collector and a negative electrode active material layer coated on the surface of the negative electrode current collector.
  • the pole piece 113 in the electrode assembly 110 has a winding axis (not shown in the figure) during winding. After the pole piece 113 is bent around the winding axis, the bent portion 112 is formed. Therefore, along the winding axis direction, the plug-in component 120 can be inserted unimpeded between two adjacent layers of pole pieces 113 in the bent portion 112. By inserting the plug-in component 120 into the bend along the winding axis direction of the electrode assembly 110, The folded portion 112 facilitates the installation of the plug-in component 120 and helps maintain the gap between the two layers of pole pieces 113 .
  • the plug assembly 120 is inserted into the bent portion 112 along the winding axis direction of the electrode assembly 110 to occupy a certain space in the bent portion 112, so that a certain gap is maintained between two adjacent layers of pole pieces 113.
  • the specific structure, shape, size, etc. of the connecting component 120 are not limited. Specifically, the plug component 120 is inserted between two adjacent layers of pole pieces 113 in the bent portion 112 .
  • the plug-in component 120 is inserted into at least one side of the bending portion 112 , that is to say, the plug-in component 120 can be inserted into the bending portion 112 on any side, or it can be inserted into the bending portions on both sides. Plug-in components 120 are inserted into 112 .
  • the plug assembly 120 is inserted between two adjacent layers of pole pieces 113 in the bent portion 112 of the electrode assembly 110 along the winding axis direction of the electrode assembly 110.
  • 120 occupies a certain space in the bent part 112, so that a certain gap can be maintained between two adjacent layers of pole pieces 113 in the bent part 112, preventing the pole pieces 113 from being easily squeezed due to a too small gap and bearing a large load. pressure, reducing the risk of lithium precipitation between two adjacent layers of pole pieces 113, and improving the reliability of the battery cell 100.
  • the plug assembly 120 is inserted between two adjacent layers of pole pieces 113 in the bent portion 112 from either side of the winding axis direction of the electrode assembly 110 .
  • the plug assembly 120 can be inserted between two adjacent layers of pole pieces 113 in the bending portion 112 without hindrance.
  • the bending The portion 112 has two opposite sides in the direction of the winding axis.
  • the plug-in component 120 can be inserted between two adjacent layers of pole pieces 113 in the bent portion 112 from any side in the direction of the winding axis. In this way The design allows the plug-in component 120 to be plugged in any direction, which facilitates the installation of the plug-in component 120.
  • FIG. 5 is a schematic structural diagram of the plug assembly 120 in the battery cell 100 provided by an embodiment of the present application.
  • the plug assembly 120 includes a plug connector 121 inserted between two adjacent layers of pole pieces 113 in the bent portion 112 .
  • the plug component 120 is inserted between two adjacent pole pieces 113 in the bending part 112 through the plug connector 121.
  • the shape, structure, size, etc. of the plug connector 121 are not limited.
  • the required gap size between two adjacent layers of pole pieces 113 can be flexibly adjusted and set.
  • the plug assembly 120 using the plug connector 121 has a simple structure and is easy to process and manufacture.
  • each plug connector 121 is inserted between two adjacent layers of pole pieces 113 in the bent portion 112 .
  • the electrode assembly 110 can be wound multiple times. Therefore, in the bent portion 112 on each side, the pole piece 113 can be wound multiple times to form multiple gaps between two adjacent layers of pole pieces 113. This correspondingly, by arranging multiple plug connectors 121 in the plug assembly 120, they can be respectively inserted between two different adjacent layers of pole pieces 113, so that the distance between the multi-layer pole pieces 113 in the electrode assembly 110 A certain gap is maintained.
  • the specific number of plug connectors 121 can be set according to the number of windings of the pole pieces 113 to ensure that there are plug connectors 121 between each different group of adjacent two layers of pole pieces 113 in the bent portion 112 .
  • the plug assembly 120 further includes a fixing base 122 extending along the first direction a. One end of each plug connector 121 protrudes outside the bending portion 112 and is connected to the fixing base 122 .
  • the plug connector 121 has one end that protrudes outside the bending portion 112 and is connected to the fixing base 122 .
  • Their connection method is not limited.
  • the plug connector 121 can be connected by bonding,
  • the connection with the fixed base 122 is achieved by fastener connection, etc.
  • the plug connector 121 can also be integrally processed and formed with the fixed base 122 .
  • the connector 121 is inserted between two adjacent layers of pole pieces 113 in the bent portion 112 along its end that is not connected to the fixing base 122 , and the fixing base 122 is disposed between the electrode assembly 110 In addition, the normal use of the electrode assembly 110 will not be affected.
  • the length of the plug connector 121 protruding out of the bending portion 112 is no more than 5 millimeters (mm).
  • the length of the plug-in connector 121 protruding out of the bending portion 112 should not be too large or too small.
  • the length of the plug-in connector 121 protruding out of the bending portion 112 can be 1 mm, 2 mm, 2.5 mm, or 4 mm. , 5mm, etc., the above data are only examples. In the actual embodiment, the length of the plug connector 121 protruding out of the bending portion 112 is not limited to the above data.
  • Such a design enables an appropriate gap to be maintained between the fixing base 122 and the electrode assembly 110, which reduces the overall space occupied by the battery cell 100 without affecting the normal use of the electrode assembly 110.
  • each plug connector 121 is arranged side by side along the first direction a on the fixed base 122, and two adjacent plug connectors 121 are spaced apart from each other.
  • a plurality of plug connectors 121 are arranged side by side on the fixed base 122 along the first direction a.
  • the plug connectors 121 are inserted between two adjacent layers of pole pieces 113 in the bending portion 112 .
  • the arrangement direction of the plug connectors 121 is parallel to the arrangement direction of the bending portion 112 . In this way, the plug connectors 121 It can be evenly inserted into the bent portion 112 to make the gaps between the pole pieces 113 in the bent portion 112 more uniform.
  • Figure 6 is a schematic structural diagram of the plug assembly 120 in the battery cell 100 provided by another embodiment of the present application.
  • Figure 7 is a battery cell provided by another embodiment of the present application.
  • the projected outline of the plug connector 121 on the surface of the fixing base 122 is circular, linear, folded or arc-shaped.
  • the projected outline of the plug connector 121 on the surface of the fixing base 122 is circular.
  • the plug connector 121 has a simple structure and a smooth cross-section. The size is uniform, which facilitates the installation of the plug connector 121.
  • the projected outline of the plug connector 121 on the surface of the fixing base 122 is linear.
  • This structure can increase the strength of the plug connector 121 .
  • the maximum cross-sectional size is suitable for electrode assemblies 110 that require a larger gap between two adjacent layers of pole pieces 113 .
  • the projected outline of the plug connector 121 on the surface of the fixing base 122 is a polygonal shape.
  • the cross section of the plug connector 121 has different sizes at different positions, and from the size There is a uniform transition from the largest part to the smallest part, which is beneficial to the uniformity of the gap between two adjacent layers of pole pieces 113.
  • the above shapes are only examples.
  • the projected outline of the plug connector 121 on the surface of the fixing base 122 is not limited to the above shape, and may also be an arc shape or other shapes.
  • the plug connector 121 is provided with multiple liquid storage holes (not shown in the figure).
  • the liquid storage hole can be used to store electrolyte.
  • the electrolyte is a medium required for the battery cell 100 to work normally.
  • the electrolyte can provide ions for electrochemical reactions and ensure that the chemical reactions that occur during operation are reversible.
  • the liquid storage hole on the plug connector 121 can absorb and store the electrolyte through capillary phenomenon, so that the electrolyte can diffuse between the two adjacent layers of pole pieces 113 with the help of the plug connector 121, ensuring that the bent portion 112 can be electrolyzed
  • the liquid wetting further reduces the risk of lithium precipitation in the electrode assembly 110 .
  • the liquid storage holes include through holes and/or blind holes.
  • a through hole refers to a liquid storage hole with both ends opening through the connector 121
  • a blind hole refers to a liquid storage hole with only one end opening penetrating through the connector 121 and the other end opening buried in the connector 121.
  • Providing through holes on the plug connector 121 can be used as a storage space and transmission channel for the electrolyte, and providing blind holes can be used as a storage space for the electrolyte, so that the plug connector 121 can absorb the electrolyte to wet the bent portion 112 .
  • the liquid storage hole on the connector 121 can be flexibly set according to actual use requirements. It can be provided with only through holes, only blind holes, or both through holes and blind holes.
  • the diameter of the liquid storage hole is greater than or equal to 1 micrometer ( ⁇ m) and less than or equal to 10 micrometer ( ⁇ m).
  • the diameter of the liquid storage hole can be flexibly set.
  • the diameter of the liquid storage hole can be 1 ⁇ m or 2 ⁇ m.
  • the above data are only examples, and in actual embodiments, the diameter of the liquid storage hole is not limited to the above data. Properly setting the diameter of the liquid storage hole not only facilitates the arrangement of the liquid storage hole, but also enables the plug connector 121 to absorb enough electrolyte to ensure the wetting effect on the bent portion 112 .
  • the porosity of the plug connector 121 is greater than or equal to 30% and less than or equal to 50%.
  • Porosity refers to the percentage of the pore volume of the liquid storage hole in the connector 121 to the total volume of the connector 121 material in its natural state. Another concept corresponding to the porosity is the compactness.
  • the compactness represents the connector 121
  • the degree to which the interior is filled with solids quantitatively reflects the content of solids inside the connector 121, and its impact on material properties is exactly opposite to the impact of porosity. All in all, the porosity or density directly reflects the density of the connector 121.
  • a high porosity of the connector 121 indicates a low density. On the contrary, a low porosity of the connector 121 indicates a large density.
  • the porosity of the connector 121 can be 30%, 35%, 42%, 48%, 50%, etc.
  • the porosity of the connector 121 is not limited to the above data. . Properly setting the porosity of the connector 121 not only facilitates the processing of the connector 121 , but also enables the connector 121 to absorb enough electrolyte to ensure the wetting effect on the bent portion 112 .
  • the connector 121 is made of polyethylene or polypropylene.
  • Polyethylene (PE, polyethylene) is made from the polymerization of ethylene. It has excellent low temperature resistance, good chemical stability, and can resist the erosion of most acids and alkalis.
  • Polypropylene (PP, polypropylene) is produced from propylene through the addition polymerization reaction and has chemical resistance, heat resistance, electrical insulation, high strength mechanical properties and good high wear resistance processing properties. Such a design enables the connector 121 to have excellent physical and chemical properties, is easy to process and manufacture, and has low cost.
  • a diaphragm 114 is provided between two adjacent layers of pole pieces 113 in the bent portion 112 , and the plug-in component 120 is inserted between the pole pieces 113 and the diaphragm 114 .
  • the electrode assembly 110 also includes a separator 114.
  • the separator 114 is made of insulating material, and the two adjacent layers of pole pieces 113 are arranged opposite to each other. , the diaphragm 114 can be disposed between two adjacent layers of pole pieces 113 to insulate them. At this time, there is a gap between the pole piece 113 and the diaphragm 114 in the bent portion 112 , and the plug-in component 120 can be inserted between the pole piece 113 and the diaphragm 114 .
  • the plug component 120 is attached to the side of its corresponding pole piece 113 facing the bending center of the bending portion 112 .
  • the bending portion 112 has a bending center after being bent, and the bending center is the center of the arc where the bending portion 112 is located. At the same time, the bending portion 112 has a bending center toward the bending center. one side, and a side away from the bending center, wherein the bending portion 112 is concave on the side facing the bending center, and the bending portion 112 is convex on the side away from the bending center.
  • the plug-in component 120 is inserted between the pole piece 113 and the diaphragm 114, the two sides of the plug-in assembly 120 are respectively the corresponding pole piece 113 and the diaphragm 114.
  • the plug-in assembly 120 can be attached to its corresponding on the pole piece 113, and the plug-in component 120 is attached to the side of the corresponding pole piece 113 facing the bending center of the bending part 112, so that the plug-in component 120 is in contact with the recess of the pole piece 113 in the bending part 112
  • the contact points avoid stress concentration on the pole piece 113 in the bent portion 112 , reduce the risk of lithium precipitation in the pole piece 113 , and improve the reliability of the battery cell 100 .
  • an embodiment of the present application also provides a battery 10.
  • the battery 10 includes a box 200 and a plurality of battery cells 100 as described above.
  • the battery cells 100 are accommodated in the box 200.
  • the battery 10 in the embodiment of the present application adopts the above-mentioned battery cell 100, and inserts the plug assembly 120 between two adjacent layers of pole pieces 113 in the bent portion 112 of the electrode assembly 110 along the winding axis direction of the electrode assembly 110. time, since the plug-in component 120 occupies a certain space in the bending part 112, a certain gap can be maintained between two adjacent layers of pole pieces 113 in the bending part 112, and the gap between two adjacent layers of pole pieces 113 can be reduced. The risk of lithium precipitation occurs and the reliability of the battery cell 100 is improved.
  • an embodiment of the present application also provides an electrical device 1.
  • the electrical device 1 includes the above-mentioned battery 10, and the battery 10 is used to provide electrical energy.
  • the electric device 1 in the embodiment of the present application uses the above-mentioned battery 10 to provide electric energy. Since the battery 10 has high reliability, the safety of the electric device 1 is also higher.

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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)
  • Secondary Cells (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

La présente invention concerne un élément de batterie, une batterie et un dispositif électrique. L'élément de batterie comprend un ensemble électrode et un ensemble de connexion d'insertion. L'ensemble électrode comprend une partie droite et des parties de courbure disposées sur deux côtés de la partie droite dans une première direction. L'ensemble de connexion d'insertion est inséré entre deux plis adjacents d'une feuille d'électrode dans la partie de courbure sur au moins un côté dans une direction d'axe d'enroulement de l'ensemble électrode. Dans l'élément de batterie de la présente invention, l'ensemble de connexion d'insertion est inséré entre les deux plis adjacents de la feuille d'électrode dans la partie de courbure de l'ensemble électrode dans la direction de l'axe d'enroulement de l'ensemble électrode, et occupe ainsi un certain espace dans la partie de courbure, de telle sorte que les deux plis adjacents de la feuille d'électrode dans la partie de courbure sont espacés par un certain espace, ce qui permet de réduire le risque qu'une précipitation de lithium se produise entre les deux plis adjacents de la feuille d'électrode, et d'améliorer la fiabilité d'utilisation de l'élément de batterie.
PCT/CN2022/125090 2022-08-29 2022-10-13 Élément de batterie, batterie et dispositif électrique WO2024045276A1 (fr)

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CN116435714B (zh) * 2023-06-09 2024-02-02 宁德时代新能源科技股份有限公司 电极组件、制造方法、电池单体、电池及用电设备

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW428605U (en) * 1998-01-16 2001-04-01 Ju Sung Fu Improved structure of welding-free chemical reaction tank
KR100879297B1 (ko) * 2007-09-27 2009-01-19 삼성에스디아이 주식회사 이차 전지
CN112563560A (zh) * 2021-02-23 2021-03-26 江苏时代新能源科技有限公司 电池单体、电池、用电装置及电池单体的制造方法
CN212810367U (zh) * 2020-08-21 2021-03-26 宁德时代新能源科技股份有限公司 电极组件、电池单体、电池和用电装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW428605U (en) * 1998-01-16 2001-04-01 Ju Sung Fu Improved structure of welding-free chemical reaction tank
KR100879297B1 (ko) * 2007-09-27 2009-01-19 삼성에스디아이 주식회사 이차 전지
CN212810367U (zh) * 2020-08-21 2021-03-26 宁德时代新能源科技股份有限公司 电极组件、电池单体、电池和用电装置
CN112563560A (zh) * 2021-02-23 2021-03-26 江苏时代新能源科技有限公司 电池单体、电池、用电装置及电池单体的制造方法

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