WO2024045692A1 - Module de batterie, batterie et dispositif électrique - Google Patents

Module de batterie, batterie et dispositif électrique Download PDF

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Publication number
WO2024045692A1
WO2024045692A1 PCT/CN2023/094221 CN2023094221W WO2024045692A1 WO 2024045692 A1 WO2024045692 A1 WO 2024045692A1 CN 2023094221 W CN2023094221 W CN 2023094221W WO 2024045692 A1 WO2024045692 A1 WO 2024045692A1
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WO
WIPO (PCT)
Prior art keywords
battery
battery module
battery cells
module according
component
Prior art date
Application number
PCT/CN2023/094221
Other languages
English (en)
Chinese (zh)
Inventor
杨康康
Original Assignee
江苏时代新能源科技有限公司
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 江苏时代新能源科技有限公司, 宁德时代新能源科技股份有限公司 filed Critical 江苏时代新能源科技有限公司
Publication of WO2024045692A1 publication Critical patent/WO2024045692A1/fr

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Classifications

    • 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
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/244—Secondary casings; Racks; Suspension devices; Carrying devices; Holders characterised by their mounting method
    • 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
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
    • H01M50/209—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for prismatic or rectangular 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
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/233—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions
    • H01M50/242—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions adapted for protecting batteries against vibrations, collision impact or swelling
    • 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
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/249—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders specially adapted for aircraft or vehicles, e.g. cars or trains
    • 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
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/258—Modular batteries; Casings provided with means for assembling
    • 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
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/262—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders with fastening means, e.g. locks
    • H01M50/264—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders with fastening means, e.g. locks for cells or batteries, e.g. straps, tie rods or peripheral frames
    • 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
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/289—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by spacing elements or positioning means within frames, racks or packs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/505—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing comprising a single busbar
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/588—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries outside the batteries, e.g. incorrect connections of terminals or busbars
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
    • H01M50/593—Spacers; Insulating plates
    • 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 field of batteries, and in particular to a battery module, a battery and an electrical device.
  • Batteries are widely used in electronic devices, such as mobile phones, laptops, battery cars, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, electric tools, etc. Batteries may include nickel-cadmium batteries, nickel-hydrogen batteries, lithium-ion batteries, secondary alkaline zinc-manganese batteries, etc.
  • this application provides a battery module, battery and electrical device that can limit the deformation of the battery cell and improve the safety of the battery cell operation process.
  • this application provides a battery module including:
  • Battery cells multiple battery cells are arranged in sequence along their own thickness direction;
  • connection component has both ends extending along the thickness direction of the battery cells respectively.
  • the connection component is provided at one end of the plurality of battery cells in the height direction, and the two ends of the connection component are respectively connected to the casing;
  • an accommodation space is formed between the casing and the connecting component to limit the deformation of the battery cells.
  • multiple battery cells are provided in the battery module, which effectively expands the capacity of the battery module and expands the application range of the battery module. Moreover, by arranging connecting components in the casing, the deformation of the battery cells is limited and the safety of the battery module operation is improved.
  • the housing includes end plates provided at both ends of the plurality of battery cells in the thickness direction, and a bottom plate provided at one end of the battery cells in the height direction.
  • the two ends of the connecting member are respectively connected to the two end plates.
  • the components are positioned relative to the base plate.
  • the battery module includes a plurality of battery groups, each battery group includes a plurality of battery cells arranged in sequence along its own thickness direction, and the plurality of battery groups are arranged in sequence along the width direction of the battery cells.
  • the battery module also includes at least one partition plate disposed between two adjacent battery groups, and the two ends of the partition plate are respectively connected to the two end plates.
  • the housing further includes side plates provided at both ends of the battery cell in the width direction, The side plates and end plates are connected end to end in sequence.
  • side plates are provided to enhance the width-direction limit to further improve stability.
  • the connecting components and partitions are arranged in one-to-one correspondence.
  • the above structure can superimpose the connection force between the connecting component and the separator, improve the stability of the connection between the separator and the end plate, and limit the deformation of the battery cells.
  • the plurality of battery packs are equal in thickness.
  • the above-mentioned structure can ensure that the forces on both sides of the partition are balanced, ensure the structural integrity of the entire housing, and further improve the safety performance of the battery module.
  • the number of battery packs is two, and the number of battery cells in the two battery packs is equal.
  • the two battery packs are arranged symmetrically to improve the regularity of the overall structure of the battery module and ensure the convenience of installation of connecting components.
  • the end plate is provided with a connecting groove, and the end of the partition extends into the connecting groove and is connected with the end plate.
  • the separator plate and the end plate are welded together. Welded connection, high connection strength and strong stability.
  • the orthographic projection of the connection assembly on the base plate is at least partially coincident with the orthographic projection of the partition on the base plate.
  • the battery cells are provided with electrode terminals protruding along the height direction of the battery cells, and the connecting component is disposed between the two electrode terminals of two adjacent battery cells.
  • the thickness of the connecting component is smaller than the protruding electrode terminals. size of.
  • the connecting component is arranged in the gap between the two electrode terminals, taking up no additional space and ensuring the volumetric energy density of the battery cell.
  • the end of the connecting component is bent toward the bottom plate to form a connecting portion, and the connecting portion is connected to the end plate.
  • the connecting portion is connected to a side of the end plate facing away from the battery cell.
  • connection part and the end plate are connected by welding or riveting. Welded or riveted, the structure is simple and easy to implement.
  • the battery module further includes a bus component.
  • the bus component is located at an end of the battery cell away from the bottom plate in the height direction.
  • the bus component is electrically connected to a plurality of battery cells respectively.
  • the connection component is located on the bus component toward the battery. One side of the monomer.
  • connection component includes a connection bar and an insulating layer disposed around the periphery of the connection bar.
  • the connecting strip is made of metal material.
  • the connecting strips are made of metal materials to ensure the strength of the connection.
  • the extension length of the connection component in the height direction of the battery cell ranges from 0.5 mm to 2 mm
  • the extension length of the connection component in the width direction of the battery cell ranges from 20 mm to 40 mm.
  • this application also provides a battery, including the battery module in the above embodiment.
  • the present application also provides an electrical device, including the battery in the above embodiment, and the battery is used to provide electrical energy.
  • Figure 1 is a schematic structural diagram of a vehicle provided by some embodiments of the present application.
  • FIG. 2 is an exploded schematic diagram of a battery provided by some embodiments of the present application.
  • Figure 3 is an exploded schematic diagram of a battery cell in a battery provided by some embodiments of the present application.
  • FIG. 4 is a schematic structural diagram of a battery module provided by some embodiments of the present application.
  • FIG. 5 is a schematic structural diagram of a battery module provided by other embodiments of the present application.
  • Figure 6 is a partial cross-sectional structural diagram of the end plate of the battery module provided by some embodiments of the present application.
  • Figure 7 is a partial cross-sectional structural schematic diagram of a battery module provided by other embodiments of the present application.
  • an embodiment means that a particular feature, structure or characteristic described in connection with the embodiment may be included in at least one embodiment of the 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.
  • connection should be understood in a broad sense.
  • connection can be a fixed connection, It can also be detachably connected or integrally connected; it can be directly connected or indirectly connected through an intermediate medium; it can be internal communication between two components.
  • connection can be a fixed connection
  • connection can also be detachably connected or integrally connected; it can be directly connected or indirectly connected through an intermediate medium; it can be internal communication between two components.
  • attachment should be understood in a broad sense.
  • it can be a fixed connection, It can also be detachably connected or integrally connected; it can be directly connected or indirectly connected through an intermediate medium; it can be internal communication between two components.
  • “Plural” appearing in this application means two or more (including two).
  • battery cells may include lithium ion secondary battery cells, lithium ion primary battery cells, lithium sulfur battery cells, sodium lithium ion battery cells, sodium ion battery cells or magnesium ion battery cells, etc.
  • the embodiments of the present application are not limited to this.
  • the battery cell may be in the shape of a cylinder, a flat body, a rectangular parallelepiped or other shapes, and the embodiments of the present application are not limited to this.
  • Battery cells are generally divided into three types according to packaging methods: cylindrical battery cells, square battery cells and soft-pack battery cells, and the embodiments of the present application are not limited to this.
  • the battery mentioned in the embodiments of this 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.
  • Batteries generally include a casing for enclosing one or more battery cells. The casing prevents liquids or other foreign matter from affecting the charging or discharging of the battery cells.
  • the battery cell includes an electrode unit and an electrolyte.
  • the electrode unit includes at least one electrode assembly.
  • the electrode assembly includes a positive electrode piece, a negative electrode piece and a separator.
  • Battery cells mainly rely on the movement of metal ions between the positive and negative electrodes to work.
  • the positive electrode plate includes the positive electrode current collector and Positive electrode active material layer, the positive electrode active material layer is coated on the surface of the positive electrode current collector;
  • the positive electrode current collector includes a positive electrode current collector and a positive electrode protrusion protruding from the positive electrode current collector, the positive electrode current collector is coated with the positive electrode active material layer , at least part of the positive electrode convex part is not coated with the positive electrode active material layer, and the positive electrode convex part serves as the positive electrode tab.
  • the material of the cathode current collector can be aluminum, and the cathode active material layer includes cathode active materials.
  • the cathode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganate, etc.
  • the negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, and the negative electrode active material layer is coated on the surface of the negative electrode current collector; the negative electrode current collector includes a negative electrode current collecting part and a negative electrode convex part protruding from the negative electrode current collecting part, and the negative electrode current collecting part
  • the negative electrode active material layer is coated on the negative electrode active material layer, and at least part of the negative electrode protruding part is not coated with the negative electrode active material layer, and the negative electrode protruding part serves as the negative electrode tab.
  • the negative electrode current collector may be made of copper, and the negative electrode active material layer may include a negative electrode active material.
  • the negative electrode active material may be carbon or silicon.
  • the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together.
  • the material of the isolator can be PP (polypropylene, polypropylene) or PE (polyethylene, polyethylene), etc.
  • the electrode assembly may have a rolled structure or a laminated structure, and the embodiments of the present application are not limited thereto.
  • Electrical devices can be vehicles 1, mobile phones, portable devices, laptops, ships, spacecraft, electric toys and power tools, etc.
  • Vehicle 1 can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc.
  • spacecraft include airplanes, rockets, space shuttles, spaceships, etc.
  • electric toys include Stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, electric airplane toys, etc.
  • electric tools include metal cutting power tools, grinding power tools, assembly power tools and railway power tools, such as , electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers, etc.
  • the embodiments of this application impose no special restrictions on the above-mentioned electrical devices.
  • the following embodiments take the electrical device as a vehicle as an example.
  • FIG. 1 is a schematic structural diagram of a vehicle provided by some embodiments of the present application.
  • a battery 2 is provided inside the vehicle 1 , and the battery 2 can be provided at the bottom, head, or tail of the vehicle 1 .
  • the battery 2 may be used to power the vehicle 1 , for example, the battery 2 may be used as an operating power source for the vehicle 1 .
  • the vehicle 1 may also include a controller 3 and a motor 4.
  • the controller 3 is used to control the battery 2 to provide power to the motor 4, for example, to meet the power requirements for starting, navigation and driving of the vehicle 1.
  • the battery 2 can not only be used as an operating power source for the vehicle 1 , but also can be used as a driving power source for the vehicle 1 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1 .
  • FIG. 2 is an exploded schematic diagram of the battery 2 provided by some embodiments of the present application.
  • the battery 2 includes a box 5 and a battery module 40 .
  • a plurality of battery cells form the battery module 40 , and the battery module 40 is accommodated in the box 5 .
  • the box 5 is used to accommodate battery cells, and the box 5 can be of various structures.
  • the box 5 may include a first part 51 and a second part 52.
  • the first part 51 and the second part 52 cover each other.
  • the first part 51 and the second part 52 jointly define a space for accommodating battery cells.
  • the second part 52 may be a hollow structure with one end open, and the first part 51 is a plate-like structure, and the first part 51 is covered with the open side of the second part 52 to form a box 5 with a receiving space 53;
  • the first part 51 and the Both parts 52 may also be hollow structures with one side open, and the open side of the first part 51 is covered with the open side of the second part 52 to form a box 5 with a receiving space 53 .
  • the first part 51 and the second part 52 can be in various shapes, such as cylinder, cuboid, etc.
  • a sealing member such as sealant, sealing ring, etc., may also be provided between the first part 51 and the second part 52 .
  • the first part 51 can also be called the upper box cover, and the second part 52 can also be called the lower box body.
  • the battery 2 there may be one battery cell or a plurality of battery cells. If there are multiple battery cells, the multiple battery cells can be connected in series, in parallel, or in mixed connection. Mixed connection means that multiple battery cells are connected in series and in parallel. Multiple battery cells can be directly connected in series or parallel or mixed together, and then the whole composed of multiple battery cells can be accommodated in the box 5; of course, multiple battery cells can also be connected in series or parallel first or A battery module 40 is formed by a mixed connection, and multiple battery modules 40 are connected in series, parallel or mixed to form a whole, and are accommodated in the box 5 .
  • FIG 3 is an exploded schematic diagram of a battery cell in a battery provided by some embodiments of the present application.
  • there are multiple battery cells 7 and the plurality of battery cells 7 are first connected in series, parallel, or mixed to form the battery module 40 .
  • Multiple battery modules 40 are connected in series, parallel, or mixed to form a whole, and are accommodated in the box.
  • the plurality of battery cells 7 in the battery module 40 can be electrically connected through bus components to realize parallel, series or mixed connection of the plurality of battery cells 7 in the battery module 40 .
  • the battery cell 7 in the embodiment of the present application includes an electrode unit 10, a casing 20 and an end cap assembly 30.
  • the housing 20 has an opening 21 , the electrode unit 10 is accommodated in the housing 20 , and the end cover assembly 30 is used to connect the housing 20 and cover the opening 21 .
  • the electrode unit 10 includes at least one electrode assembly 11 .
  • the electrode unit 10 in FIG. 3 includes two electrode assemblies 11 .
  • the electrode assembly 11 includes a positive electrode piece, a negative electrode piece and a separator.
  • the electrode assembly 11 may be a rolled electrode assembly, a laminated electrode assembly, or other forms of electrode assembly.
  • electrode assembly 11 is a rolled electrode assembly.
  • the positive electrode piece, the negative electrode piece and the separator are all in strip structure.
  • the positive electrode piece, the separator and the negative electrode piece can be stacked in sequence and wound more than two times to form the electrode assembly 11 .
  • the electrode assembly 11 is a stacked electrode assembly.
  • the electrode assembly 11 includes a plurality of positive electrode pieces and a plurality of negative electrode pieces.
  • the positive electrode pieces and the negative electrode pieces are alternately stacked, and the stacking direction is parallel to the thickness direction of the positive electrode piece and the thickness direction of the negative electrode piece.
  • the electrode unit 10 includes at least one electrode assembly 11 . That is, in the battery cell 7 , there may be one electrode assembly 11 accommodated in the casing 20 , or there may be multiple electrode assemblies 11 .
  • the housing 20 is a hollow structure with one side open.
  • the end cap assembly 30 covers the opening of the housing 20 and forms a sealed connection to form a receiving cavity for receiving the electrode unit 10 and the electrolyte.
  • the housing 20 can be in various shapes, such as cylinder, rectangular parallelepiped, etc.
  • the shape of the housing 20 can be determined according to the specific shape of the electrode unit 10 . For example, if the electrode unit 10 has a cylindrical structure, a cylindrical shell can be selected; if the electrode unit 10 has a rectangular parallelepiped structure, a rectangular parallelepiped shell can be selected.
  • the end cap assembly 30 can also have various structures, such as a plate-like structure or a hollow structure with one end open, etc.
  • the housing 20 has a rectangular parallelepiped structure, and the end cover assembly 30 has a plate-like structure. The end cover assembly 30 covers the opening at the top of the housing 20 .
  • End cap assembly 30 also includes electrode terminals 25 .
  • electrode terminals 25 are provided, and the two electrode terminals 25 are respectively defined as a positive electrode terminal and a negative electrode terminal.
  • the positive electrode terminal and the negative electrode terminal are respectively used to electrically connect with the positive electrode tab and the negative electrode tab of the electrode assembly 11 to output the current generated by the electrode assembly 11 .
  • the end cover assembly 30 also includes a pressure relief mechanism 24, which is used to relieve the internal pressure or temperature of the battery cell 7 when the internal pressure or temperature of the battery cell 7 reaches a predetermined value.
  • the pressure relief mechanism 24 is located between the positive electrode terminal and the negative electrode terminal.
  • the pressure relief mechanism 24 may be a component such as an explosion-proof valve, explosion-proof disk, air valve, pressure relief valve or safety valve.
  • the housing 20 may also be a hollow structure with openings on opposite sides.
  • the end cover assembly 30 includes two end cover assemblies 30 .
  • the two end cover assemblies 30 respectively cover the two openings of the housing 20 and are connected in a sealing manner to form an accommodation cavity for accommodating the electrode unit 10 and the electrolyte.
  • the positive and negative electrode terminals may be mounted on the same end cap assembly 30 . In other examples, the positive electrode terminal and the negative electrode terminal are mounted on the two end cap assemblies 30 respectively.
  • a battery module in order to ensure the structural stability of the battery module as much as possible, multiple battery cells are usually stacked in sequence along the thickness direction.
  • the electrode pole pieces will expand along the thickness direction.
  • the electrode plates in the battery cells are usually stacked along the thickness direction. Therefore, the deformation in the thickness direction of the battery cell is the largest. According to experimental tests, the deformation of the battery module under high temperature conditions can reach 5mm to 10mm in the thickness direction of the battery cell. Of course, some deformation will also occur in the width direction of the battery cell, but the amount of deformation is smaller than the deformation in the thickness direction of the battery cell.
  • the multiple battery cells When multiple battery cells are arranged along the thickness direction, the multiple battery cells expand along the thickness direction at the same time, and the superposition of their deformations will cause the casing of the battery module to deform or even break. The battery cells lose their restraints, causing safety accidents.
  • the battery module includes a connecting component, and the connecting component is arranged in the height direction of multiple battery cells.
  • One end of the connecting component is connected to the housing of the battery module respectively, and an accommodation space is formed between the housing and the connecting component to limit the deformation of the battery cells.
  • multiple battery cells are provided in the battery module, and by connecting the battery cells in series or parallel, the capacity of the battery module is effectively expanded and the application scope of the battery module is expanded. . Moreover, by arranging connecting components in the casing, the deformation of the battery cells is limited and the safety of the battery module operation is improved.
  • Figure 4 is a schematic structural diagram of a battery module 40 provided by some embodiments of the present application
  • Figure 5 is a structural diagram of a battery module 40 provided by other embodiments of the present application.
  • Schematic diagram is a schematic partial cross-sectional structural diagram of the end plate of the battery module provided by some embodiments of the present application
  • Figure 7 is a partial cross-sectional structural schematic diagram of the battery module 40 provided by other embodiments of the present application.
  • the embodiment of the present application provides a battery module 40 , including: a battery cell 7 , a case 8 and a connecting component 9 .
  • the plurality of battery cells 7 are arranged in sequence along the thickness direction X of the battery cells 7 .
  • the housing 8 is used to accommodate the battery cells 7 .
  • Both ends of the connection component 9 respectively extend along the thickness direction Among them, an accommodation space is formed between the housing 8 and the connecting component 9 to limit the deformation of the battery cells 7 .
  • the housing 8 can be formed by a plurality of side plates 803 and a bottom plate 802, or it can be an integral housing structure with openings.
  • the connecting component 9 can be disposed on the opening of the housing 8 .
  • the housing 8 can be made of material with a certain strength, such as metal materials.
  • the inner wall of the housing 8 can be configured to fit the battery cells 7 to form a certain constraint on the battery cells 7 .
  • the connecting component 9 is usually a strip structure, and the connecting component 9 itself has a certain tensile strength, resists the deformation of the battery cell 7 in the thickness direction X, and forms a certain constraint on the battery cell 7 . Moreover, the volume of the connecting component 9 cannot be too large to ensure the energy density of the battery module 40 .
  • a plurality of battery cells 7 are provided in the battery module 40, and by connecting the battery cells 7 in series or in parallel, the capacity of the battery module 40 is effectively expanded, and the battery module is expanded.
  • Application scope of group 40 Furthermore, by arranging the connection component 9 in the housing 8 , the deformation of the battery cell 7 is limited and the safety of the operation process of the battery module 40 is improved.
  • the housing 8 includes a thickness configured for a plurality of battery cells 7
  • the end plates 801 at both ends in the direction
  • a limiting structure connected end to end is formed to limit the deformation in the thickness direction X of the battery cell 7.
  • the battery module 40 includes multiple battery packs, and each battery pack includes a plurality of battery cells 7 arranged in sequence along its thickness direction X.
  • the battery packs are arranged sequentially along the width direction Y of the battery cells 7.
  • the battery module 40 also includes at least one partition 804 disposed between two adjacent battery groups. The two ends of the partition 804 are respectively connected to the two ends. Board 801.
  • multiple battery packs are provided in each battery module 40, and multiple battery cells 7 can be arranged along the width direction Y, thereby improving the regularity of the battery module 40, and connecting adjacent battery packs.
  • the partitions 804 are arranged between them to ensure the orderly arrangement of the battery packs in the width direction Y.
  • the housing 8 also includes side plates 803 provided at both ends of the battery cell 7 in the width direction Y.
  • the side plates 803 and the end plates 801 are connected end to end in sequence.
  • the side plate 803 is provided to enhance the limit in the width direction Y and further improve the stability.
  • the number of partitions 804 is multiple, and the number of connection components 9 is multiple.
  • the connection components 9 and partitions 804 are arranged in one-to-one correspondence. The above structure can superimpose the connection between the connecting component 9 and the separator 804, improve the stability of the connection between the separator 804 and the end plate 801, and limit the deformation of the battery cell 7.
  • the thicknesses of the plurality of battery packs are equal.
  • the number of battery packs can also be set to multiple, for example, 3 or 5 battery packs arranged along the width direction Y.
  • the above structure can ensure that the forces on both sides of the partition 804 are balanced, ensure the structural integrity of the entire housing 8, and further improve the safety performance of the battery module 40.
  • the number of battery groups is two, and the number of battery cells 7 in the two battery groups is equal.
  • the two battery packs are arranged symmetrically to improve the regularity of the overall structure of the battery module 40 and ensure the convenience of installation of the connecting component 9 .
  • the end plate 801 is provided with a connecting groove 805, and the end of the partition plate 804 extends into the connecting groove 805 and is connected with the end plate 801.
  • the connecting groove 805 By providing the connecting groove 805, the end of the partition 804 is fixed, and the structure is simple and easy to install.
  • the partition plate 804 and the end plate 801 are welded together. Welded connection, high connection strength and strong stability.
  • the orthographic projection of the connection assembly 9 on the bottom plate 802 at least partially coincides with the orthographic projection of the partition 804 on the bottom plate 802 .
  • the above structure limits the deformation of the battery cell 7 through the connecting component 9, ensuring the stability and strength of the connection between the separator 804 and the end plate 801.
  • the battery cell 7 is provided with electrode terminals 25 protruding along its height direction Z, and the connecting component 9 is provided between the two electrode terminals 25 of two adjacent battery cells 7,
  • the thickness of the connection component 9 is smaller than the protruding size of the electrode terminal 25 .
  • the connecting component 9 is disposed in the gap between the two electrode terminals 25, which does not occupy additional space and ensures the volume energy density of the battery cell 7.
  • the end of the connecting component 9 is bent toward the bottom plate 802 to form a connecting portion 901 , and the connecting portion 901 is connected to the end plate 801 .
  • the connecting portion 901 by providing the connecting portion 901, the stability of the connection between the connecting component 9 and the end plate 801 is enhanced.
  • the connecting portion 901 is connected to a side of the end plate 801 facing away from the battery cell 7 .
  • the above structure improves the strength of the connection between the connecting component 9 and the end plate 801.
  • connection part 901 and the end plate 801 are connected by welding or riveting. Welded or riveted, the structure is simple and easy to implement. As shown in Figure 7, connection component 9 The connecting portion 901 is provided with a connecting hole, and the end plate 801 is provided with a recessed fixing hole. The rivets 902 pass through the connecting holes and extend into the fixing holes to connect the connecting component 9 and the end plate 801 .
  • the above-mentioned structural method has stable connection and high strength.
  • the battery module 40 also includes a bus component (not shown).
  • the bus component is provided at an end of the battery cell 7 away from the bottom plate 802 in the height direction Z.
  • the bus component is connected to a plurality of battery cells respectively.
  • the body 7 is electrically connected, and the connection component 9 is provided on the side of the bus part facing the battery cell 7 .
  • connection component 9 includes a connection bar and an insulating layer disposed around the periphery of the connection bar. By providing an insulating layer, the current of the bus component is prevented from flowing to the end plate 801 through the connection component 9, thereby improving the safety of the battery module 40.
  • the connecting strip is made of metal material.
  • the connecting strips are made of metal materials to ensure the strength of the connection.
  • the steel strip material can be stainless steel, spring steel or 65Mn.
  • the extension length of the connecting component 9 in the height direction Z of the battery cell 7 ranges from 0.5 mm to 2 mm, and the extension length of the connecting component 9 in the width direction Y of the battery cell 7 The value range of length: 20mm ⁇ 40mm.
  • the battery module 40 includes a battery cell 7 , a housing 8 and a connecting component 9 .
  • the plurality of battery cells 7 are arranged in sequence along the thickness direction X of the battery cells 7 .
  • the housing 8 is used to accommodate the battery cells 7 .
  • Both ends of the connecting component 9 extend along the thickness direction X of the battery cells 7 respectively, and the connecting component 9 is provided in the height direction Z of the plurality of battery cells 7
  • One end on the top, and both ends of the connecting component 9 are respectively connected to the housing 8; wherein, an accommodation space is formed between the housing 8 and the connecting component 9 to limit the deformation of the battery cell 7.
  • the housing 8 includes end plates 801 provided at both ends of the plurality of battery cells 7 in the thickness direction , the connection component 9 is arranged opposite to the base plate 802.
  • the battery module 40 includes a plurality of battery groups. Each battery group includes a plurality of battery cells 7 arranged in sequence along its own thickness direction X. The plurality of battery groups are sequentially arranged along the width direction Y of the battery cells 7.
  • the battery module 40 also includes at least one separator 804 disposed between two adjacent battery groups, and the two ends of the separator 804 are connected to the two end plates 801 respectively.
  • the housing 8 also includes side plates 803 located at both ends of the battery cell 7 in the width direction Y. The side plates 803 and the end plates 801 are connected end to end in sequence.
  • the number of battery packs is two, and the number of battery cells 7 in the two battery packs is equal.
  • the end plate 801 is provided with a connecting groove 805, and the end of the partition plate 804 extends into the connecting groove 805 and is connected to the end plate 801.
  • the partition plate 804 and the end plate 801 are connected by welding.
  • the orthographic projection of the connection assembly 9 on the bottom plate 802 and the orthographic projection of the partition 804 on the bottom plate 802 at least partially coincide.
  • the battery cell 7 is provided with electrode terminals 25 protruding along its own height direction Z.
  • the connecting component 9 is disposed between the two electrode terminals 25 of two adjacent battery cells 7 .
  • the thickness of the connecting component 9 is smaller than the electrode terminal 25 Protruding dimensions.
  • the end of the connecting component 9 is bent toward the direction of the bottom plate 802 to form a connecting portion 901 , and the connecting portion 901 is connected to the end plate 801 .
  • the connecting portion 901 is connected to the side of the end plate 801 facing away from the battery cell 7 .
  • the connection part 901 and the end plate 801 are connected by welding or riveting.
  • the battery module 40 also includes a bus component.
  • the bus component is located at an end of the battery cell 7 away from the bottom plate 802 in the height direction Z.
  • the bus component is electrically connected to a plurality of battery cells 7 respectively.
  • the connection component 9 is located on the bus component facing the battery.
  • the connection component 9 includes a connection strip and an insulating layer surrounding the outer periphery of the connection strip.
  • the housing 8 includes end plates 801 provided at both ends of the plurality of battery cells 7 in the thickness direction X, and a bottom plate 802 provided at one end of the battery cells 7 in the height direction Z.
  • the two ends of the component are respectively connected to the two end plates 801, and the connecting component 9 is arranged opposite to the bottom plate 802.
  • An embodiment of the present application also provides a battery 2, including the battery module 40 in the above embodiment.
  • the embodiment of the present application also provides an electric device.
  • the electric device includes the battery 2 in the above embodiment, and the battery 2 is used to provide electric energy. Since the above-mentioned battery 2 and the electric device include the battery module 40 in the above embodiment, the battery 2 and the electric device provided by the embodiment of the present application can achieve the above technical effects.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Battery Mounting, Suspending (AREA)

Abstract

La présente demande divulgue un module de batterie, une batterie et un dispositif électrique. Le module de batterie comprend des éléments de batterie, de multiples éléments de batterie étant agencés séquentiellement dans le sens de l'épaisseur des éléments de batterie ; un boîtier pour recevoir les éléments de batterie ; et un ensemble de connexion dont les deux extrémités s'étendent respectivement dans le sens de l'épaisseur des éléments de batterie. L'ensemble de connexion est disposé à une extrémité dans la direction de la hauteur des multiples éléments de batterie. Les deux extrémités de l'ensemble de connexion sont connectées au boîtier. Un espace de réception pour limiter la déformation des éléments de batterie est formé entre le boîtier et l'ensemble de connexion. Dans le schéma technique des modes de réalisation de la présente demande, de multiples éléments de batterie sont agencés dans le module de batterie pour étendre efficacement la capacité du module de batterie, ce qui permet d'étendre la plage d'applications du module de batterie. De plus, l'ensemble de connexion est disposé dans le boîtier pour limiter la déformation des éléments de batterie, ce qui permet d'améliorer la sécurité du processus de travail du module de batterie.
PCT/CN2023/094221 2022-08-30 2023-05-15 Module de batterie, batterie et dispositif électrique WO2024045692A1 (fr)

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CN202211050914.X 2022-08-30
CN202211050914.XA CN115172979B (zh) 2022-08-30 2022-08-30 电池模组、电池以及用电装置

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Publication number Priority date Publication date Assignee Title
CN115172979B (zh) * 2022-08-30 2023-06-20 江苏时代新能源科技有限公司 电池模组、电池以及用电装置

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CN110323372A (zh) * 2018-03-29 2019-10-11 宁德时代新能源科技股份有限公司 复合端板以及电池模组
CN110391368A (zh) * 2018-04-20 2019-10-29 宁德时代新能源科技股份有限公司 二次电池、其装配方法和电池模组
CN209993643U (zh) * 2019-06-21 2020-01-24 森源汽车股份有限公司 一种动力电池箱体及动力电池
CN111416079A (zh) * 2020-03-15 2020-07-14 南京金龙客车制造有限公司 一种新能源汽车电池集成结构
CN211700397U (zh) * 2020-05-07 2020-10-16 中航锂电（洛阳）有限公司 电池模块框架及电池模块
WO2022110768A1 (fr) * 2020-11-26 2022-06-02 比亚迪股份有限公司 Bloc-batterie et véhicule
CN115172979A (zh) * 2022-08-30 2022-10-11 江苏时代新能源科技有限公司 电池模组、电池以及用电装置

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Publication number Priority date Publication date Assignee Title
CN110323372A (zh) * 2018-03-29 2019-10-11 宁德时代新能源科技股份有限公司 复合端板以及电池模组
CN110391368A (zh) * 2018-04-20 2019-10-29 宁德时代新能源科技股份有限公司 二次电池、其装配方法和电池模组
CN209401680U (zh) * 2018-12-29 2019-09-17 宁德时代新能源科技股份有限公司 电池模组
CN209993643U (zh) * 2019-06-21 2020-01-24 森源汽车股份有限公司 一种动力电池箱体及动力电池
CN111416079A (zh) * 2020-03-15 2020-07-14 南京金龙客车制造有限公司 一种新能源汽车电池集成结构
CN211700397U (zh) * 2020-05-07 2020-10-16 中航锂电（洛阳）有限公司 电池模块框架及电池模块
WO2022110768A1 (fr) * 2020-11-26 2022-06-02 比亚迪股份有限公司 Bloc-batterie et véhicule
CN115172979A (zh) * 2022-08-30 2022-10-11 江苏时代新能源科技有限公司 电池模组、电池以及用电装置

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CN116470213A (zh) 2023-07-21
CN115172979A (zh) 2022-10-11

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