WO2023092849A1 - Élément de batterie, batterie et appareil électrique - Google Patents

Élément de batterie, batterie et appareil électrique Download PDF

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Publication number
WO2023092849A1
WO2023092849A1 PCT/CN2022/073130 CN2022073130W WO2023092849A1 WO 2023092849 A1 WO2023092849 A1 WO 2023092849A1 CN 2022073130 W CN2022073130 W CN 2022073130W WO 2023092849 A1 WO2023092849 A1 WO 2023092849A1
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WO
WIPO (PCT)
Prior art keywords
electrode assembly
inactive material
material part
battery cell
wall
Prior art date
Application number
PCT/CN2022/073130
Other languages
English (en)
Chinese (zh)
Inventor
吴益扬
叶永煌
武宝珍
王育文
陈新祥
Original Assignee
宁德时代新能源科技股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 宁德时代新能源科技股份有限公司 filed Critical 宁德时代新能源科技股份有限公司
Priority to CN202280010347.7A priority Critical patent/CN116745970A/zh
Publication of WO2023092849A1 publication Critical patent/WO2023092849A1/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
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • 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
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/613—Cooling or keeping cold
    • 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
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
    • H01M10/625—Vehicles
    • 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
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/658—Means for temperature control structurally associated with the cells by thermal insulation or shielding
    • 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
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/471—Spacing elements inside cells other than separators, membranes or diaphragms; Manufacturing processes thereof
    • H01M50/474—Spacing elements inside cells other than separators, membranes or diaphragms; Manufacturing processes thereof characterised by their position inside the cells
    • 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
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/471—Spacing elements inside cells other than separators, membranes or diaphragms; Manufacturing processes thereof
    • H01M50/48—Spacing elements inside cells other than separators, membranes or diaphragms; Manufacturing processes thereof characterised by the material
    • 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 application relates to the technical field of batteries, in particular to a battery cell, a battery and an electrical device.
  • Batteries may include nickel-cadmium batteries, nickel-hydrogen batteries, lithium-ion batteries, secondary alkaline zinc-manganese batteries, and the like. At present, lithium-ion batteries are generally used in vehicles. As a rechargeable battery, lithium-ion batteries have the advantages of small size, high energy density, high power density, many cycle times and long storage time.
  • the battery includes an electrode assembly.
  • the electrode assembly will generate heat during use, which will increase the internal temperature of the battery.
  • the gas production of the battery will increase, the internal pressure will increase, and the diaphragm may also be deformed, resulting in a short circuit. raise security issues.
  • the present application provides a battery cell, a battery, and an electrical device, which can increase the heat dissipation rate of the battery and reduce the risk of excessive battery temperature.
  • the present application provides a battery cell, including a casing, an electrode assembly, and an insulating and heat-conducting member.
  • the shell has an accommodating cavity.
  • the electrode assembly is located in the housing cavity.
  • the electrode assembly includes a first pole piece.
  • the first pole piece includes a first active material part and a first inactive material part.
  • the first inactive material part runs from the end of the first active material part along the second One direction extends toward the wall of the housing, and the first direction is the thickness direction of the wall.
  • the insulating heat conduction element is at least partially disposed between the first inactive material part and the wall part, so as to realize heat conduction between the first inactive material part and the wall part.
  • the first inactive material portion extends from the end of the first active material portion toward the wall along the thickness direction of the wall, and the insulating and heat-conducting member is at least partially located between the first inactive material portion and the wall,
  • the heat of the electrode assembly can be conducted to the casing through the first inactive material part and the insulating heat-conducting member, a heat transfer path is established, and the heat dissipation speed and safety performance of the battery cell are improved.
  • a side surface of the insulating heat conducting member facing the electrode assembly is attached to the first inactive material portion, and a side surface of the insulating heat conducting member facing away from the electrode assembly is attached to the wall portion.
  • both the first inactive material portion and the wall portion are attached to the insulating and heat-conducting member, so that both the first inactive material portion and the wall are in contact with the insulating and heat-conducting member, further improving the heat dissipation rate of the battery cell.
  • the free end of the first inactive material portion abuts against a surface of the insulating heat-conducting member facing the electrode assembly.
  • the free end forms a contact end surface and abuts against the insulating and heat-conducting member, so that the heat of the electrode assembly can be directly conducted to the shell through the first inactive material part and the insulating and heat-conducting member, and at the same time reduces the amount of heat generated by the first inactive material.
  • the required dimension in the thickness direction of the wall portion is the required dimension in the thickness direction of the wall portion.
  • the first inactive material portion includes a first connecting portion and a second connecting portion, the first connecting portion is connected to the first active material portion, and moves from the end of the first active material portion toward the The wall portion is extended, the second connecting portion is bent relative to the first connecting portion, and the surface of the second connecting portion facing the insulating and heat-conducting element is attached to the insulating and heat-conducting element.
  • the second connection part of the first inactive material part is bent relative to the first connection part, and the surface of the second connection part facing the insulation and heat conduction part is attached to the insulation and heat conduction part, which increases the first
  • the contact area between the inactive material part and the insulating and heat-conducting member further increases the heat dissipation rate of the battery cell.
  • a support is further included, and the support is bent and disposed inside the first connecting portion and/or the second connecting portion.
  • the support member is arranged on the inside of the first connecting part and/or the second connecting part, which provides support for the first inactive material part, reduces the bending of the first inactive material part and inserts into the electrode assembly, risk of short circuit.
  • the two electrode assemblies include a first electrode assembly and a second electrode assembly, the first inactive material part of the first electrode assembly and the first inactive material part of the second electrode assembly
  • the active material parts extend toward each other or extend toward each other.
  • the first inactive material portion of the first electrode assembly and the first inactive material portion of the second electrode assembly extend toward each other or extend away from each other, reducing the first inactive material portion.
  • the space occupied by the material part reduces the loss of the energy density of the battery cell.
  • both the first electrode assembly and the second electrode assembly include a first pole piece, the first pole piece includes a first part and a second part, and the first inactive material part is formed from the first part of the first part.
  • the active material part extends toward the wall of the housing along the first direction, and the first part of the first electrode assembly is adjacent to the first part of the second electrode assembly.
  • the first part of the first electrode assembly and the first part of the second electrode assembly are arranged adjacent to each other, and the first inactive material part extends from the first active material part of the first part toward the wall of the casing along the first direction. , so that the heat from the side of the electrode assembly away from the casing can be conducted to the casing through the first inactive material part and the insulating heat-conducting member, thereby improving the problem that the central area of the battery cell is difficult to dissipate heat.
  • the electrode assembly includes an electrode lead-out portion and a second pole piece.
  • the electrode lead-out part is arranged on the shell, and is used for inputting or outputting electric energy.
  • the first pole piece further includes a second inactive material part, and the second inactive material part is used for electrically connecting the electrode lead-out part.
  • the polarity of the second pole piece is opposite to that of the first pole piece.
  • the second pole piece includes a second active material part and a third inactive material part.
  • the first active material part and the second active material part are stacked to form a main body part. In one direction, the second inactive material part and the third inactive material part are located on one side of the main body, and the first inactive material part is located on the other side of the main body.
  • the electrode assembly includes a separator located at least partially between the first active material portion and the second active material portion, and the first inactive material portion protrudes beyond the separator along a first direction.
  • the diaphragm is at least partially located between the first active material part and the second active material part, so that the first pole piece and the second pole piece are insulated, reducing the risk of short circuit of the electrode assembly; the first inactive material part Extending beyond the diaphragm along the first direction, the first inactive material can break through the barrier of the diaphragm and conduct heat to the casing through the insulating and heat-conducting member.
  • the first inactive material portion does not exceed the outermost separator of the electrode assembly, and the second direction is perpendicular to the first direction.
  • the first inactive material part does not exceed the side of the electrode assembly, which reduces the risk of the first inactive material part being overlapped with the casing and causing a short circuit.
  • the first pole piece, the separator and the second pole piece are wound along the winding direction to form an electrode assembly, the electrode assembly includes a straight area and a bent area, and the first inactive material part is located in the straight area.
  • the first inactive material part is located in the straight region, which reduces the difficulty of bending the first inactive material part.
  • the thermal conductivity of the insulating thermally conductive member is greater than the thermal conductivity of the membrane.
  • the thermal conductivity of the insulating and heat-conducting member is greater than that of the diaphragm, so that the insulating and heat-conducting member can conduct heat more effectively and faster than the diaphragm.
  • the housing includes a shell and an end cover
  • the shell includes a bottom wall and a side wall
  • the side wall is surrounded by the bottom wall
  • one end of the side wall is connected to the bottom wall
  • the other end of the side wall is surrounded by a
  • the bottom wall is opposite to the opening
  • the end cover covers the opening
  • the wall part is the bottom wall.
  • the present application provides a battery, including the battery cell provided in the first aspect of the present application.
  • the present application provides an electric device, including the battery provided in the second aspect of the present application.
  • the present application provides a battery cell, a battery, and an electrical device.
  • the battery cell includes a casing, an electrode assembly, and an insulating and heat-conducting member.
  • the shell has an accommodating cavity.
  • the electrode assembly is located in the housing cavity.
  • the electrode assembly includes a first pole piece.
  • the first pole piece includes a first active material part and a first inactive material part.
  • the first inactive material part runs from the end of the first active material part along the second One direction extends toward the wall of the housing, and the first direction is the thickness direction of the wall.
  • the insulating and heat-conducting member is at least partly disposed between the first inactive material part and the wall to realize heat conduction between the first inactive material part and the wall, thereby increasing the heat dissipation rate of the battery and reducing the risk of overheating of the battery.
  • Fig. 1 is a schematic structural diagram of a vehicle disclosed in some embodiments of the present application.
  • Fig. 2 is a schematic structural diagram of a battery disclosed in some embodiments of the present application.
  • Fig. 3 is a schematic structural diagram of a battery module disclosed in some embodiments of the present application.
  • Fig. 4 is an exploded view of a battery cell disclosed in some embodiments of the present application.
  • Fig. 5 is a cross-sectional view of a battery cell disclosed in some embodiments of the present application.
  • Fig. 6 is a cross-sectional view of a battery cell disclosed in other embodiments of the present application.
  • Fig. 7 is a cross-sectional view of a battery cell disclosed in some other embodiments of the present application.
  • Fig. 8 is a schematic diagram of an electrode assembly disclosed in some embodiments of the present application.
  • Fig. 9 is a schematic diagram of a housing disclosed in some embodiments of the present application.
  • connection In the description of this application, it should be noted that, unless otherwise clearly stipulated and limited, the terms “installation”, “connection”, “connection” and “attachment” should be understood in a broad sense, for example, it may be a fixed connection, It can also be detachably connected or integrally connected; it can be directly connected or indirectly connected through an intermediary, and it can be internal communication between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in this application according to specific situations.
  • the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of the various components in the embodiments of the application shown in the drawings, as well as the overall thickness, length and width of the integrated device, are for illustrative purposes only, and should not constitute any limitation to the application .
  • “Plurality” in this application refers to two or more (including two).
  • the battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, which are not limited in the embodiments of the present application.
  • the battery cell can be in the form of a cylinder, a flat body, a cuboid or other shapes, which is not limited in this embodiment of the present application.
  • Battery cells are generally divided into three types according to packaging methods: cylindrical battery cells, square square battery cells and pouch battery cells, which are not limited in this embodiment of the present application.
  • the battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.
  • the battery mentioned in this application may include a battery module or a battery pack, and the like.
  • Batteries generally include a case for enclosing one or more battery cells. The box can prevent liquid or other foreign objects from affecting the charging or discharging of the battery cells.
  • the battery cell includes an electrode assembly and an electrolyte, and the electrode assembly is composed of a positive pole piece, a negative pole piece and a diaphragm.
  • a battery cell primarily relies on the movement of metal ions between the positive and negative plates to function.
  • the positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer, the positive electrode active material layer is coated on the surface of the positive electrode current collector, and the positive electrode collector without the positive electrode active material layer protrudes from the positive electrode collector coated with the positive electrode active material layer. Fluid, the positive electrode current collector not coated with the positive electrode active material layer is used as the positive electrode tab.
  • the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobaltate, lithium iron phosphate, ternary lithium or lithium manganate.
  • the negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, the negative electrode active material layer is coated on the surface of the negative electrode current collector, and the negative electrode collector without the negative electrode active material layer protrudes from the negative electrode collector coated with the negative electrode active material layer. Fluid, the negative electrode current collector not coated with the negative electrode active material layer is used as the negative electrode tab.
  • the material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon or silicon.
  • the number of positive pole tabs is multiple and stacked together, and the number of negative pole tabs is multiple and stacked together.
  • the material of the base film of the separator may be PP (polypropylene, polypropylene) or PE (polyethylene, polyethylene) or the like.
  • the diaphragm in order to isolate the positive pole piece and the negative pole piece, in the electrode assembly, the diaphragm usually exceeds the pole piece in the width direction and the length direction of the pole piece. Due to the low thermal conductivity of the diaphragm, it is difficult for the heat inside the electrode assembly to break through the diaphragm The obstruction of the battery cell is quickly exported to the outside of the battery cell through the shell of the battery cell.
  • the present application provides a battery cell, the current collector of the positive pole piece or the current collector of the negative pole piece along the Extending in the direction close to the wall of the shell, to a certain size beyond the diaphragm, and an insulating heat conducting member is provided between the extended current collector and the wall of the shell, while improving the heat dissipation performance of the battery cell, maintaining the gap between the shell and the electrode assembly insulation.
  • Electrical devices can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys and power tools, etc.
  • Vehicles can be fuel vehicles, gas vehicles or new energy vehicles, and new energy vehicles can be pure electric vehicles, hybrid vehicles or extended-range vehicles;
  • spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.;
  • electric toys include fixed Type or mobile electric toys, such as game consoles, electric car toys, electric boat toys and electric airplane toys, etc.;
  • electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, for example, Electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, electric planers, and more.
  • the embodiment of the present application does not impose special limitations on the above electric equipment.
  • FIG. 1 is a schematic structural diagram of a vehicle 1000 disclosed in some embodiments of the present application.
  • a battery 100 is disposed inside the vehicle 1000 .
  • the battery 100 may be disposed at the bottom, head or tail of the vehicle 1000 .
  • the battery 100 can be used for power supply of the vehicle 1000 , for example, the battery 100 can be used as an operating power source of the vehicle 1000 .
  • the battery 100 can not only be used as an operating power source for the vehicle 1000 , but can also be used as a driving power source for the vehicle 1000 to provide driving power for the vehicle 1000 instead of or partially replacing fuel oil or natural gas.
  • FIG. 2 is a schematic structural diagram of a battery 100 provided in some embodiments of the present application
  • FIG. 3 is a schematic structural diagram of a battery module 20 disclosed in some embodiments of the present application.
  • the battery 100 It includes a box body 10 and a battery cell 30 , and the box body 10 is used for accommodating the battery cell 30 .
  • the box body 10 is a component for accommodating the battery cells 30
  • the box body 10 provides a storage space for the battery cells 30
  • the box body 10 may have various structures.
  • the box body 10 may include a first split body 11 and a second split body 12, and the first split body 11 and the second split body 12 cover each other to define a storage space for accommodating the battery cells 30. space.
  • the first split body 11 and the second split body 12 can be in various shapes, such as cuboid, cylinder and so on.
  • the first split body 11 can be a hollow structure with one side open, and the second split body 12 can also be a hollow structure with one side open, and the open side of the second split body 12 is covered with the open side of the first split body 11, then A box body 10 having a storage space is formed. It can also be that the first split body 11 is a hollow structure with one side open, the second split body 12 is a plate-like structure, and the second split body 12 covers the open side of the first split body 11 to form a box with accommodating space.
  • the first split body 11 and the second split body 12 can be sealed by a sealing element, and the sealing element can be a sealing ring, a sealant, or the like.
  • the battery 100 there may be one or a plurality of battery cells 30 . If there are multiple battery cells 30 , the multiple battery cells 30 may be connected in series, in parallel or in parallel.
  • the hybrid connection means that the multiple battery cells 30 are both in series and in parallel.
  • a plurality of battery cells 30 may be connected in series or in parallel or mixed to form a battery module 20 , and then a plurality of battery modules 20 are connected in series or in parallel or mixed to form a whole and accommodated in the box 10 . It is also possible that all the battery cells 30 are directly connected in series, parallel or mixed together, and then the whole composed of all the battery cells 30 is accommodated in the case 10 .
  • the battery 100 may further include a confluence component, through which multiple battery cells 30 may be electrically connected, so as to realize series, parallel or mixed connection of the multiple battery cells 30 .
  • the bus component may be a metal conductor, such as copper, iron, aluminum, stainless steel, aluminum alloy, and the like.
  • FIG. 3 is a schematic structural diagram of a battery module 20 disclosed in some embodiments of the present application.
  • the battery module 20 includes battery cells 30 . There may be one or more battery cells 30 .
  • FIG. 4 is an exploded view of the battery cell 30 disclosed in some embodiments of the present application
  • FIG. 5 is a cross-sectional view of the battery cell 30 disclosed in some embodiments of the present application.
  • the battery cell 30 includes a casing 31 , an electrode assembly 40 and an insulating and heat-conducting member 50 .
  • the housing 31 has a receiving chamber 32 .
  • the electrode assembly 40 is located in the housing cavity 32, the electrode assembly 40 includes a first pole piece 41, the first pole piece 41 includes a first active material part 411 and a first inactive material part 412, the first inactive material part 412 is formed from the first The end of the active material portion 411 extends toward the wall portion 3111 of the casing 31 along a first direction X, which is the thickness direction of the wall portion 3111 .
  • the insulating and heat-conducting member 50 is at least partially disposed between the first inactive material part 412 and the wall part 3111 to realize heat conduction between the first inactive material part 412 and the wall part 3111 .
  • the housing 31 may include an end cover 312 and a housing 311 , or may be an integral structure.
  • the shell 31 can be metal, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc., or can be non-metallic material such as plastic or other composite materials.
  • the shell 31 can be made of the same material as a whole, or can be composed of multiple materials.
  • the housing 31 can be in various shapes, such as cuboid, cylinder, cube and so on.
  • the shell 31 can be formed by extrusion, stretching, casting or stamping.
  • the housing 31 has an accommodating cavity 32, which can be in various shapes, such as cuboid, cylinder, cube and so on.
  • the shape of the housing 31 corresponds to the shape of the accommodating cavity 32 , for example, when the housing 31 is a cuboid, the accommodating cavity 32 is a cuboid. In some embodiments, under normal conditions, the accommodating cavity 32 remains airtight.
  • the electrode assembly 40 may be wound, stacked or rolled.
  • the electrode assembly 40 is composed of a positive pole piece, a negative pole piece and a separator 44 .
  • the number of electrode assemblies 40 may be one or more. In some embodiments, a plurality of electrode assemblies 40 are arranged side by side and accommodated in the containing cavity 32 .
  • the positive electrode sheet includes a positive electrode current collector and a positive electrode active material.
  • the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobaltate, lithium iron phosphate, ternary lithium or lithium manganate.
  • the negative electrode sheet includes a negative electrode current collector and a negative electrode active material.
  • the material of the negative electrode current collector can be copper, and the negative electrode active material can be carbon or silicon.
  • the material of the base film of the diaphragm 44 can be PP (polypropylene, polypropylene) or PE (polyethylene, polyethylene) or the like.
  • the first pole piece 41 may be a positive pole piece or a negative pole piece, which is not particularly limited in the present application. As an example, the following takes the first pole piece 41 as a negative pole piece as an example.
  • the first pole piece 41 includes a first active material part 411 coated with an active material and an empty foil area not coated with an active material, and the empty foil area includes a first inactive material part 412 .
  • the first inactive material part 412 may be integral with or separate from the current collector of the first active material part 411 . In some embodiments, the current collector of the first inactive material part 412 and the first active material part 411 is integrated.
  • the first inactive material portion 412 extends from the end of the first active material portion 411 toward the wall portion 3111 of the housing 31 along the thickness direction of the wall portion 3111.
  • the wall portion 3111 may be a side wall and/or a bottom wall of the housing 31, for example. Specifically, referring to FIG. 5 , the wall portion 3111 is the bottom wall of the housing 31 .
  • the insulating and heat-conducting member 50 can be made of metal materials such as aluminum or stainless steel whose surface has been insulated, or can be made of insulating materials such as plastics and silica gel. In some embodiments, the thermal conductivity of the insulating thermally conductive member 50 is greater than 2 watts/(meter ⁇ Kelvin) [W/(m ⁇ K)]. In some embodiments, the insulating and heat-conducting member 50 is a plate-shaped structure.
  • Heat conduction can occur in solids, liquids and gases, and heat conduction can be through direct contact of the first inactive material part 412, the insulating heat-conducting member 50, and the wall part 3111, or heat transfer through other media such as electrolyte.
  • the first inactive material portion 412 extends from the end of the first active material portion 411 toward the wall portion 3111 along the thickness direction of the wall portion 3111 , and the insulating and heat-conducting member 50 is at least partially located on the first inactive material portion 412 and the wall part 3111, so that the heat of the electrode assembly 40 can be conducted to the casing 31 through the first inactive material part 412 and the insulating and heat-conducting member 50, a heat transfer path is established, and the heat dissipation speed and safety of the battery cell 30 are improved. performance.
  • the side surface of the insulating heat conducting member 50 facing the electrode assembly 40 is attached to the first inactive material portion 412 , and the side surface of the insulating heat conducting member 50 facing away from the electrode assembly 40 is attached to the wall portion 3111 .
  • Attaching means that the surface of the insulating heat conducting member 50 facing the electrode assembly 40 is in contact with the first inactive material portion 412 , and the surface of the insulating heat conducting member 50 facing away from the electrode assembly 40 is in contact with the wall portion 3111 .
  • the attachment can be in direct contact or connected by means of bonding, riveting, welding, etc., and the method of attaching the insulating and heat-conducting member 50 to the first inactive material part 412 and the method of attaching the insulating and heat-conducting member 50 to the wall part 3111 can be the same, It can also be different, and there is no special limitation in this application.
  • both the first inactive material part 412 and the wall part 3111 are attached to the insulating and heat-conducting member 50, so that both the first inactive material part 412 and the wall part 3111 are in contact with the insulating and heat-conducting member 50, further improving the performance of the battery.
  • the heat dissipation rate of the monomer 30 is the heat dissipation rate of the monomer 30.
  • the free end of the first inactive material portion 412 abuts against the side surface of the insulating and heat-conducting member 50 facing the electrode assembly 40 .
  • the free end of the first inactive material part 412 refers to the end of the first inactive material part 412 opposite to the connecting end of the first active material part 411 .
  • Abutment means that the free end of the first inactive material part 412 is in contact with the surface of the insulating heat conducting member 50 facing the electrode assembly 40 , and abuts against the surface of the insulating heat conducting member 50 facing the electrode assembly 40 .
  • the abutment can be achieved by bonding, riveting, welding, etc., or by direct contact.
  • the electrode assembly 40 abuts the first inactive material portion 412 on the surface of the insulating heat conducting member 50 by its own gravity.
  • the first inactive material part 412 when the electrode assembly is in a winding structure, is continuous in the winding direction, and in the length direction of the insulating and heat-conducting member 50, both ends of the first inactive material part 412 Knead and fold in the middle.
  • the free end forms a contact end surface and abuts against the insulating and heat-conducting member 50, so that the heat of the electrode assembly 40 can be directly conducted to the shell 31 through the first inactive material part 412 and the insulating and heat-conducting member 50, while reducing the
  • the first inactive material portion 412 has a desired dimension in the thickness direction of the wall portion 3111 .
  • FIG. 6 is a cross-sectional view of a battery cell disclosed in another embodiment of the present application.
  • the first inactive material part 412 includes a first connecting part 412a and a second connecting part 412b.
  • the first connecting part 412a is connected to the first connecting part 412a.
  • active material part 411 and extends from the end of the first active material part 411 toward the wall part 3111 along the first direction X, the second connecting part 412b is bent relative to the first connecting part 412a, and the second connecting part 412b faces
  • the surface of the insulating heat conducting member 50 is attached to the insulating heat conducting member 50 .
  • the first connecting part 412a is connected to the first active material part 411
  • the second connecting part 412b is connected to the first connecting part 412a
  • the second connecting part 412b is bent relative to the first connecting part 412a, so that the first inactive material part 412 is integrally bent and disposed between the first active material part 411 and the insulating and heat-conducting member 50 .
  • the second connecting portion 412b of the first inactive material portion 412 is bent relative to the first connecting portion 412a, and the surface of the second connecting portion 412b facing the insulating and heat-conducting member 50 is attached to the insulating and heat-conducting member 50 , the contact area between the first inactive material part 412 and the insulating and heat-conducting member 50 is increased, thereby further increasing the heat dissipation rate of the battery cell 30 .
  • the battery cell 30 further includes a support member 60 that is bent and disposed inside the first connection portion 412 a and/or the second connection portion 412 b.
  • the supporting member 60 may be an insulating material.
  • the supporting member 60 is blue glue.
  • the supporting member 60 is bent and disposed inside the first connecting portion 412a and/or the second connecting portion 412b. In some embodiments, the supporting member 60 is disposed inside the first connecting portion 412a.
  • the inner side refers to the side of the first inactive material portion 412 away from the casing 31 .
  • the support member 60 is disposed inside the first connecting portion 412a and/or the second connecting portion 412b, providing support for the first inactive material portion 412 and reducing the bending of the first inactive material portion 412 After inserting the electrode assembly 40, there is a risk of short circuit.
  • the battery cell 30 includes two electrode assemblies 40 arranged side by side, the two electrode assemblies 40 include a first electrode assembly 40a and a second electrode assembly 40b, the first inactive material part 412 and the second electrode assembly 40a of the first electrode assembly 40a
  • the first inactive material portions 412 of the two electrode assemblies 40b extend toward each other or extend toward each other.
  • Arranging side by side means that the surface of the electrode assembly 40 with the largest area is in contact, and is accommodated in the shell 31 corresponding to the surface with the largest area of the shell 31.
  • the first electrode assembly 40a and the second electrode assembly 40b may be arranged side by side in a second direction Y perpendicular to the first direction X. Referring to FIG.
  • the first inactive material portion 412 of the first electrode assembly 40a and the first inactive material portion 412 of the second electrode assembly 40b extend toward each other or extend away from each other, referring to the first electrode assembly 40a
  • the first inactive material may extend toward the direction close to the second electrode assembly 40b, or may extend toward the direction away from the second electrode assembly 40b. Meanwhile, the inactive material part of the second electrode assembly 40b may extend toward the first electrode assembly 40a.
  • the extending direction of the first inactive material portion 412 of the two electrode assemblies 40 may also be the same or opposite.
  • the first inactive material portion 412 of the first electrode assembly 40a and the first inactive material portion 412 of the second electrode assembly 40b extend toward each other or extend toward each other, reducing the The space occupied by the first inactive material part 412 reduces the loss of energy density of the battery cell 30 .
  • FIG. 7 is a cross-sectional view of a battery cell 30 disclosed in some other embodiments of the present application.
  • Both the first electrode assembly 40a and the second electrode assembly 40b include a first pole piece 41, the first electrode assembly 40a and the second electrode
  • the first pole pieces 41 of the assembly 40b each include a first part 401 and a second part 402, and the first inactive material part 412 extends from the first active material part 411 of the first part 401 toward the wall part 3111 of the housing 31 along the first direction X , the first portion 401 of the first electrode assembly 40a and the first portion 401 of the second electrode assembly 40b are adjacently disposed.
  • the first part 401 is farther away from the casing 31 than the second part 402 in the direction in which the first electrode assembly 40 a and the second electrode assembly 40 b are arranged side by side; the second part 402 may only include the first active material part 411 .
  • the first part 401 of the first electrode assembly 40a and the first part 401 of the second electrode assembly 40b are arranged adjacently, and the first inactive material part 412 starts from the first active material part 411 of the first part 401 along the first
  • the direction X extends toward the wall portion 3111 of the casing 31, so that the heat on the side of the electrode assembly 40 away from the casing 31 can be conducted to the casing 31 through the first inactive material portion 412 and the insulating heat-conducting member 50, thereby improving the performance of the battery cell 30.
  • the central area is difficult to dissipate heat.
  • the electrode assembly 40 includes an electrode lead-out portion 33 and a second pole piece 42 .
  • the electrode lead-out portion 33 is disposed on the casing 31 and is used for inputting or outputting electric energy.
  • the first pole piece 41 further includes a second inactive material part 413 , and the second inactive material part 413 is used for electrically connecting the electrode lead-out part 33 .
  • the polarity of the second pole piece 42 is opposite to that of the first pole piece 41.
  • the second pole piece 42 includes a second active material part 421 and a third inactive material part 422.
  • the first active material part 411 and the second active material part 421 are stacked. And form a main body, in the first direction X, the second inactive material part 413 and the third inactive material part 422 are located on one side of the main body, and the first inactive material part 412 is located on the other side of the main body.
  • the number of electrode lead-out parts 33 is two, and the two electrode lead-out parts 33 are respectively connected to the second inactive material part 413 and the third inactive material part 422, and the electrode lead-out parts 33 are at least partially exposed to the outside of the battery cell 30.
  • the body, that is, the lead-out part of the battery can be a pole mounted on the casing 31, or it can be the casing 31 of the battery cell 30, which is not particularly limited in this application.
  • the electrode lead-out part 33 can be made of copper, aluminum, aluminum alloy and other materials.
  • the second inactive material part 413 may be a positive pole tab or a negative pole tab.
  • the second inactive material part 413 is a negative pole tab.
  • the polarity of the third inactive material part 422 is opposite to that of the second inactive material part 413 , for example, when the second inactive material part 413 is at the negative electrode tab, the third inactive material part 422 is at the positive electrode tab.
  • the material of the positive tab is aluminum
  • the material of the negative tab is copper.
  • the second inactive material part 413 and the third inactive material part 422 may be respectively located on the same side, adjacent side or opposite side of the main body part.
  • the second inactive material portion 413 and the third inactive material portion 422 are located on the same side of the main body, and the first inactive material portion 412 is located on the other side of the main body.
  • the other side may be the adjacent side or the opposite side.
  • the second inactive material part 413 and the third inactive material part 422 are respectively connected to the electrode lead-out part 33, so that the electric energy of the battery cell 30 can be transmitted to an external electric device, or an external charging device can Electric energy is stored in the battery cells 30 .
  • the electrode assembly 40 includes a diaphragm 44 located at least partially between the first active material portion 411 and the second active material portion 421 , and the first inactive material portion 412 protrudes beyond the diaphragm 44 along the first direction X.
  • the base film material of the diaphragm 44 can be PP (polypropylene, polypropylene) or PE (polyethylene, polyethylene), etc. At least one surface of the diaphragm 44 may be compounded with a protective layer, and the protective layer may be composed of one or more materials such as ceramics and polyvinylidene fluoride.
  • the diaphragm 44 is at least partly located between the first active material part 411 and the second active material part 421, so that the first pole piece 41 and the second pole piece 42 are insulated, and the risk of short circuit of the electrode assembly 40 is reduced;
  • the first inactive material portion 412 protrudes beyond the diaphragm 44 along the first direction X, so that the first inactive material can break through the barrier of the diaphragm 44 and conduct heat to the casing 31 through the insulating and heat-conducting member 50 .
  • the first inactive material portion 412 does not exceed the outermost membrane 44 of the electrode assembly 40 , and the second direction Y is perpendicular to the first direction X.
  • the first inactive material portion 412 does not exceed the outermost diaphragm 44 of the electrode assembly 40 , that is, in the first direction X, the projection of the first inactive material portion 412 is located within the projection of the main body.
  • the first inactive material part 412 does not exceed the side of the electrode assembly 40 , which reduces the risk of the first inactive material part 412 overlapping with the casing 31 and causing a short circuit.
  • FIG. 8 is a schematic diagram of an electrode assembly 40 disclosed in some embodiments of the present application.
  • the first pole piece 41 (not shown in the figure), the separator 44 (not shown in the figure) and the second pole piece 42 (not shown in the figure) of the electrode assembly 40 are wound along the winding direction Z to form the electrode assembly 40 , the electrode assembly 40 includes a straight region 45 and a bent region 46 , and the first inactive material part 412 is located in the straight region 45 .
  • the first inactive material part 412 is located in the straight region 45 , which reduces the difficulty of bending the first inactive material part 412 .
  • the thermal conductivity of the insulating thermally conductive member 50 is greater than the thermal conductivity of the diaphragm 44 .
  • Thermal conductivity is the thermal conductivity, which is the measure of the thermal conductivity of a substance, and refers to the heat transferred through a unit horizontal cross-sectional area per unit time when the vertical downward gradient of temperature is 1°C/m.
  • the thermal conductivity of the insulating and heat-conducting member 50 is greater than that of the diaphragm 44 , so that compared with the diaphragm 44 , the insulating and heat-conducting member 50 can conduct heat more efficiently and quickly.
  • the housing 31 includes a housing 311 and an end cover 312.
  • FIG. 9 is a schematic diagram of a housing disclosed in some embodiments of the present application.
  • the housing 311 includes a bottom wall 3111a and a side wall 3111b.
  • the side wall 3111b surrounds the bottom wall 3111a, one end of the side wall 3111b is connected to the bottom wall 3111a, the other end of the side wall 3111b forms an opening 3112 opposite to the bottom wall 3111a, and the end cover 312 (not shown) covers the opening 3112, the wall part 3111 is the bottom wall 3111a.
  • the present application provides a battery cell 30 including a casing 31 , an electrode assembly 40 and an insulating and heat-conducting member 50 .
  • the housing 31 has a receiving cavity 32 .
  • the electrode assembly 40 is located in the housing cavity 32, the electrode assembly 40 includes a first pole piece 41, the first pole piece 41 includes a first active material part 411 and a first inactive material part 412, the first inactive material part 412 is formed from the first
  • the end of the active material portion 411 extends toward the wall portion 3111 of the casing 31 along a first direction X, which is the thickness direction of the wall portion 3111 .
  • the insulating and heat-conducting member 50 is at least partially disposed between the first inactive material part 412 and the wall part 3111 to realize heat conduction between the first inactive material part 412 and the wall part 3111 .
  • the first inactive material part 412 includes a first connecting part 412a and a second connecting part 412b, the first connecting part 412a is connected to the first active material part 411, and extends from the end of the first active material part 411 along the first direction X Extending toward the wall portion 3111 , the second connecting portion 412b is bent relative to the first connecting portion 412a , and the surface of the second connecting portion 412b facing the insulating and heat-conducting element 50 is attached to the insulating and heat-conducting element 50 .
  • the battery cell 30 further includes a support member 60 that is bent and disposed inside the first connection portion 412a and/or the second connection portion 412b.
  • Both the first electrode assembly 40a and the second electrode assembly 40b include a first pole piece 41 and a second pole piece 42, and the first inactive material part 412 extends from the first active material part 411 of the first pole piece 41 along the first direction X Extending toward the wall portion 3111 of the casing 31 , the first pole piece 41 of the first electrode assembly 40 a and the first pole piece 41 of the second electrode assembly 40 b are adjacently disposed.
  • the first pole piece 41 also includes a second inactive material portion 413 .
  • the polarity of the second pole piece 42 is opposite to that of the first pole piece 41.
  • the second pole piece 42 includes a second active material part 421 and a third inactive material part 422.
  • the first active material part 411 and the second active material part 421 are stacked. And form a main body, in the first direction X, the second inactive material part 413 and the third inactive material part 422 are located on one side of the main body, and the first inactive material part 412 is located on the other side of the main body.
  • the electrode assembly 40 includes a diaphragm 44 at least partially located between the first active material part 411 and the second active material part 421 , and the first inactive material part 412 protrudes beyond the diaphragm 44 along the first direction X.

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

Abstract

Les modes de réalisation de la présente invention concernent un élément de batterie, une batterie et un appareil électrique. L'élément de batterie comprend un boîtier, un ensemble électrode et un élément conducteur de chaleur isolant. Le boîtier est pourvu d'une cavité de réception. L'ensemble électrode est situé dans la cavité de réception et comprend une première plaque d'électrode, la première plaque d'électrode comprenant une première partie de matériau actif et une première partie de matériau inactif, la première partie de matériau inactif s'étendant à partir d'une partie d'extrémité de la première partie de matériau actif vers une partie de paroi du boîtier dans une première direction, et la première direction étant la direction de l'épaisseur de la partie paroi. L'élément thermoconducteur isolant est au moins partiellement disposé entre la première partie de matériau inactif et la partie paroi, de manière à réaliser une conduction thermique entre la première partie de matériau inactif et la partie de paroi, ce qui permet d'améliorer l'efficacité de dissipation de chaleur de la batterie.
PCT/CN2022/073130 2021-11-26 2022-01-21 Élément de batterie, batterie et appareil électrique WO2023092849A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202280010347.7A CN116745970A (zh) 2021-11-26 2022-01-21 电池单体、电池及用电设备

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CN202122942825.3U CN216389640U (zh) 2021-11-26 2021-11-26 电池单体、电池及用电设备
CN202122942825.3 2021-11-26

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CN116454546B (zh) * 2023-06-13 2023-09-19 宁德新能源科技有限公司 电芯、电池及用电设备

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Publication number Priority date Publication date Assignee Title
CN106602169A (zh) * 2016-12-16 2017-04-26 杨冰 一种具有散热功能的动力电池组
CN109860923A (zh) * 2017-06-28 2019-06-07 湖南妙盛汽车电源有限公司 一种热导锂离子电池
CN109860892A (zh) * 2017-06-28 2019-06-07 湖南妙盛汽车电源有限公司 一种热导锂离子电池
CN110148806A (zh) * 2017-06-28 2019-08-20 湖南妙盛汽车电源有限公司 一种热导锂离子电池

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106602169A (zh) * 2016-12-16 2017-04-26 杨冰 一种具有散热功能的动力电池组
CN109860923A (zh) * 2017-06-28 2019-06-07 湖南妙盛汽车电源有限公司 一种热导锂离子电池
CN109860892A (zh) * 2017-06-28 2019-06-07 湖南妙盛汽车电源有限公司 一种热导锂离子电池
CN110148806A (zh) * 2017-06-28 2019-08-20 湖南妙盛汽车电源有限公司 一种热导锂离子电池

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CN216389640U (zh) 2022-04-26

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