WO2024045048A1 - Élément de batterie, batterie et dispositif électrique - Google Patents

Élément de batterie, batterie et dispositif électrique Download PDF

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Publication number
WO2024045048A1
WO2024045048A1 PCT/CN2022/116225 CN2022116225W WO2024045048A1 WO 2024045048 A1 WO2024045048 A1 WO 2024045048A1 CN 2022116225 W CN2022116225 W CN 2022116225W WO 2024045048 A1 WO2024045048 A1 WO 2024045048A1
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WO
WIPO (PCT)
Prior art keywords
battery cell
electrode
battery
along
recess
Prior art date
Application number
PCT/CN2022/116225
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English (en)
Chinese (zh)
Inventor
李志强
刘声元
陈德钧
邵作业
曾超
王升威
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.)
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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 PCT/CN2022/116225 priority Critical patent/WO2024045048A1/fr
Publication of WO2024045048A1 publication Critical patent/WO2024045048A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • H01M50/148—Lids or covers characterised by their shape
    • H01M50/15—Lids or covers characterised by their shape 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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/172—Arrangements of electric connectors penetrating the casing
    • H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
    • H01M50/176—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells 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
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/552—Terminals characterised by their shape
    • H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
    • 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 battery technology, and more specifically, to a battery cell, 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.
  • the battery cells may include cadmium-nickel battery cells, nickel-hydrogen battery cells, lithium-ion battery cells, secondary alkaline zinc-manganese battery cells, etc.
  • the present application provides a battery cell, a battery and an electrical device, which can improve the energy density of the battery cell.
  • embodiments of the present application provide a battery cell including an electrode assembly, a casing and an electrode terminal;
  • the electrode assembly includes an electrode body and a tab, and the tab is led out from an end of the electrode body along a first direction;
  • the casing has a receiving cavity , the electrode assembly is accommodated in the accommodation cavity;
  • the casing has a first wall, the first wall is located on the side of the pole lug facing away from the electrode body, and the first wall has a recess that is concave toward the accommodation cavity along the first direction, and the accommodation cavity has a first sub-section.
  • the first subspace is located on at least one side of the recess, the second direction intersects the first direction, and at least part of the tab is accommodated in the first subspace; the electrode terminal is used to electrically connect with the tab, and is at least partially accommodated in the recess.
  • the battery cell provided by the embodiment of the present application transfers the space of at least one side of the external electrode terminal of the battery cell along the second direction to the inside of the battery cell by arranging a first sub-space, and accommodates at least part of the tab in the third sub-space.
  • a sub-space it is beneficial to reduce the space occupied by the tabs along the first direction inside the battery cell.
  • the space saved by arranging at least part of the tabs in the first sub-hole can be used to accommodate the electrode body. That is, the size of the electrode body along the first direction can be increased, which is beneficial to increasing the capacity of the battery cell and thereby increasing the energy density of the battery cell.
  • the depth h1 of the recess satisfies: h1 ⁇ 2.5mm. In this way, it is conducive to accommodate as much of the tabs in the first subspace as possible, reducing the space occupied by the tabs in one direction inside the battery cell, and conducive to further increasing the size of the electrode body along the first direction to maximize the Increase the capacity of the battery cell, thereby increasing the energy density of the battery cell.
  • the distance h2 between the electrode body and the bottom wall of the recess satisfies: h2 ⁇ 3mm. In this way, as much of the tab as possible can be located in the first subspace, which is beneficial to increasing the size of the electrode body along the first direction, thereby increasing the capacity and energy density of the battery cell.
  • the electrode terminal is provided on the bottom wall of the recess, and the end surface of the electrode terminal facing away from the accommodation cavity is located in the recess.
  • Such an arrangement is conducive to making full use of the extra space occupied by the electrode terminals outside the battery cell, so that the tabs are arranged in the first sub-space as much as possible along the first direction, so that the electrode body is arranged along the first direction.
  • the size should be as large as possible to increase the capacity and energy density of the battery cells.
  • loads such as shock and vibration
  • these loads will be borne by the area corresponding to the first wall and the outer casing. It will not be transmitted to the electrode terminal, which is beneficial to reducing the vibration, impact and other loads endured by the electrode terminal and maintaining the stability of the electrode terminal structure.
  • the housing includes a housing and an end cap, the end cap is covered with the housing to form a receiving cavity, and the first wall is at least part of the end cap. This arrangement helps reduce the processing difficulty of the first wall and reduces the complexity of the assembly process of the battery cells.
  • the recess is disposed through the battery cell along a third direction, and the first direction, the second direction, and the third direction intersect each other.
  • the busbar In the process of connecting the electrode terminals of two adjacent battery cells through the busbar, it is convenient for the busbar to pass through the recesses of the two adjacent battery cells without interfering with other components, which is beneficial to improving the overall structure of the battery. stability.
  • the depth h1 of the recess satisfies: h1 ⁇ 6.5mm.
  • the recess has enough space to accommodate the bus piece and the electrode terminal, that is, the bus piece and the electrode terminal are completely located inside the recess.
  • the first wall provides a certain protective effect for the bus piece and the electrode terminal, reducing the bus piece from being scratched by other components. Risk of connection failure of electrode terminals. When a battery cell is subjected to loads such as impact and vibration, it is difficult for the impact and vibration to be transmitted to the busbars and battery terminals. This will help further improve the stability of the internal structure of the battery.
  • the two first subspaces are located on both sides of the recess along the second direction. In this way, the number and arrangement of the electrode assemblies inside the battery cell can be reasonably set according to actual needs.
  • the electrode body has two first surfaces oppositely arranged along the second direction and two second surfaces oppositely arranged along the third direction, the first surface connects the two second surfaces, and the area of the first surface Greater than the area of the second surface;
  • the battery cell includes a plurality of electrode assemblies, and the plurality of electrode assemblies are arranged along the second direction. Since the area of the first surface is larger than the area of the second surface, the size of the electrode assembly along the third direction is larger than the size along the second direction.
  • the two tabs of the electrode assembly with opposite polarity can be spaced apart along the third direction.
  • the plurality of electrode assemblies are arranged along the second direction, which facilitates the electrical connection of tabs with the same polarity of different electrode assemblies.
  • the electrode body has two first surfaces oppositely arranged along the second direction and two second surfaces oppositely arranged along the third direction, the first surface connects the two second surfaces, and the area of the first surface The area is smaller than the second surface;
  • the battery cell includes a plurality of electrode assemblies, and the plurality of electrode assemblies are arranged along the third direction.
  • the size of the electrode assembly along the third direction is smaller than the size along the second direction, and the two tabs of the electrode assembly with opposite signs can be along the second direction.
  • Interval settings. Arranging multiple electrode assemblies arranged along the third direction is beneficial to realizing electrical connection of tabs with the same polarity of different electrode assemblies.
  • two recesses are located on both sides of the first subspace along the second direction.
  • the electrode body has two first surfaces oppositely arranged along the second direction and two second surfaces oppositely arranged along the third direction, the first surface connects the two second surfaces, and the surface area of the first surface The surface area is smaller than the second surface;
  • the battery cell includes a plurality of electrode assemblies, and the plurality of electrode assemblies are arranged along the third direction. Therefore, arranging multiple electrode assemblies arranged along the third direction is conducive to electrical connection of tabs with the same polarity of different electrode assemblies.
  • the battery cell includes two electrode terminals, one electrode terminal being disposed in one recess. Since the two tabs of the electrode assembly with opposite polarities are spaced apart in the first subspace along the second direction, arranging the electrode terminals on both sides of the first subspace along the second direction is conducive to the realization of the electrode terminals and the corresponding electrodes. Electrical connection to the ear.
  • the battery cell further includes a current collector connected to the electrode terminal and the tab. Connecting the electrode terminal and the tab through the current collector is helpful to reduce the difficulty of connecting the electrode terminal and the tab.
  • the current collector includes a first connection part, a second connection part and a bending part, the first connection part is connected to the electrode terminal, the second connection part is located in the first sub-space and is connected to the pole lug, and the bending part The bent portion connects the first connecting portion and the second connecting portion. This arrangement further facilitates the electrical connection between the electrode terminal and the tab.
  • the current collector includes two second connecting parts and two bent parts.
  • the two second connecting parts are located on both sides of the first connecting part.
  • the two bent parts are respectively connected to the first connecting part. Both ends and the second connection part. In this way, the electrical connection between the electrode terminal and the tabs of the same polarity located on both sides of the electrode terminal is facilitated.
  • embodiments of the present application provide a battery, including the battery cell as in any embodiment of the first aspect.
  • the battery provided according to the embodiments of the present application uses the battery cell provided in any of the above embodiments, and therefore has the same technical effect, which will not be described again here.
  • the battery further includes a bus connecting the electrode terminals of adjacent battery cells, the bus being located within the recess.
  • an embodiment of the present application provides an electrical device, including a battery as in the embodiment of the second aspect, and the battery is used to provide electric energy.
  • the electrical device provided according to the embodiment of the present application uses the battery provided by the embodiment of the present application, and therefore has the same technical effect, which will not be described again here.
  • Figure 1 is a schematic structural diagram of a vehicle provided by an embodiment of the present application.
  • FIG. 2 is an exploded schematic diagram of a battery provided by an embodiment of the present application.
  • Figure 3 is a partial enlarged view of position A in Figure 2;
  • Figure 4 is an exploded schematic diagram of a battery cell in the battery shown in Figure 2;
  • Figure 5 is a front view of a battery cell in the battery shown in Figure 2;
  • Figure 6 is a schematic cross-sectional structural diagram along B-B in Figure 5;
  • Figure 7 is an exploded schematic diagram of a battery provided by yet another embodiment of the present application.
  • Figure 8 is a partial enlarged view of M in Figure 7;
  • Figure 9 is an exploded schematic diagram of a battery cell in the battery shown in Figure 7;
  • Figure 10 is a front view of a battery cell in the battery shown in Figure 7;
  • Figure 11 is a schematic cross-sectional structural diagram along N-N in Figure 10.
  • Figure 12 is an exploded schematic diagram of a battery provided by another embodiment of the present application.
  • Figure 13 is a partial enlarged view of C in Figure 12;
  • Figure 14 is an exploded schematic diagram of a battery cell in the battery shown in Figure 12;
  • Figure 15 is a front view of a battery cell in the battery shown in Figure 12;
  • FIG. 16 is a schematic cross-sectional structural diagram along D-D in FIG. 15 .
  • Vehicle 1a, motor; 1b, controller;
  • Electrode assembly 321. Electrode body; 321a, first surface; 321b, second surface; 322, tab; 33, electrode terminal; 34, current collector; 341, first connection part; 342, second connection part; 343, bending part;
  • X first direction
  • Y second direction
  • Z third direction
  • 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.
  • 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.
  • “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 box for packaging one or more battery cells. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.
  • the battery cell includes an electrode assembly and an electrolyte.
  • 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 sheet includes a positive electrode current collector and a positive electrode active material layer, and 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 collecting part and a positive electrode convex part protruding from the positive electrode current collecting part, and the positive electrode current collecting part
  • the positive electrode active material layer is coated on the positive electrode active material layer, and at least part of the positive electrode protruding part is not coated with the positive electrode active material layer, and the positive electrode protruding 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 separator 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.
  • the inventor conducted systematic analysis and research on the structure and assembly process of battery cells.
  • the first wall is usually a straight wall.
  • the electrode terminals will occupy the space outside the battery cell along the thickness direction of the first wall.
  • the electrode terminals will occupy the space along the thickness direction of the first wall. Part of the space in the thickness direction cannot be used, resulting in a certain waste of space.
  • the tabs have a certain height relative to the electrode body, and part of the space along the height direction of the tabs inside the battery cell cannot be reasonably utilized. This limits the improvement of battery cell energy density to a certain extent.
  • the inventor has improved the structure of the battery cell.
  • the technical solutions described in the embodiments of the present application are applicable to battery cells, batteries containing battery cells, and electrical devices using batteries.
  • the battery cell provided according to the embodiment of the present application includes an electrode assembly, a casing and an electrode terminal.
  • the electrode assembly includes an electrode body and a tab, and the tab is led out from an end of the electrode body along the first direction.
  • the shell has a receiving cavity, and the electrode assembly is received in the receiving cavity.
  • the casing has a first wall, the first wall is located on a side of the tab facing away from the electrode body, and the first wall has a recess that is concave toward the accommodation cavity along the first direction, the accommodation cavity has a first subspace, and along the second direction, a first The subspace is located on at least one side of the recess, the second direction intersects the first direction, and at least part of the tab is accommodated in the first subspace.
  • the electrode terminal is at least partially accommodated in the recess and is used for electrical connection with the tab.
  • the battery cell provided by the embodiment of the present application has a first wall with a recess, and a first sub-space is provided on at least one side of the recess, so that at least part of the electrode terminal is placed in the recess, and at least part of the tab is accommodated in the recess. first subspace.
  • the space outside the battery cell occupied by the electrode terminal is transferred to the first subspace inside the battery cell, and is used to accommodate at least part of the tab. In this way, the unused space outside the battery cell is transferred to the first subspace inside the battery cell.
  • the inside is used to accommodate at least part of the tab, which is beneficial to increasing the size of the electrode body along the first direction, that is, increasing the capacity of the battery cell, thereby increasing the energy density of the battery cell.
  • Electrical devices can be vehicles, cell 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, etc.
  • spacecraft include aircraft, rockets, space shuttles, spaceships, etc.
  • electric toys include fixed Type or mobile electric toys, such as game consoles, electric car toys, electric ship 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, planers and more.
  • Electric drills Electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, planers and more.
  • the following embodiments take the electrical device as a vehicle as an example.
  • a battery 10 is provided inside the vehicle 1 .
  • the battery 10 may be disposed at the bottom, head or tail of the vehicle 1 .
  • the battery 10 may be used to power the vehicle 1, for example, the battery 10 may be used as an operating power source for the vehicle 1.
  • the vehicle 1 may also include a controller 1b and a motor 1a.
  • the controller 1b is used to control the battery 10 to supply power to the motor 1a, for example, for the starting, navigation and operating power requirements of the vehicle 1 when driving.
  • the battery 10 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 shows a schematic diagram of an exploded structure of a battery provided by an embodiment of the present application
  • FIG. 3 shows a partial enlarged view of position A in FIG. 2 .
  • the battery 10 includes battery cells 30 .
  • the battery 10 may also include a case for housing the battery cells 30 .
  • the box is used to accommodate the battery cells 30, and the box can have various structural forms.
  • the case may include a first case part 11 and a second case part 12 .
  • the first box part 11 and the second box part 12 cover each other.
  • the first box part 11 and the second box part 12 jointly define an accommodation space for accommodating battery cells.
  • the second box part 12 may be a hollow structure with one end open, and the first box part 11 is a plate-like structure.
  • the first box part 11 is covered with the opening side of the second box part 12 to form a container with accommodating space.
  • Box The first box part 11 and the second box part 12 may also be hollow structures with one side open.
  • the open side of the first box part 11 is covered with the open side of the second box part 12 to form a box with an accommodation space.
  • the first box part 11 and the second box part 12 can be in various shapes, such as cylinder, rectangular parallelepiped, etc.
  • a sealing member such as sealant, sealing ring, etc., may be provided between the first box part 11 and the second box part 12 .
  • the first box part 11 can also be called an upper box cover, and the second box part 12 can also be called a lower box.
  • the battery 10 there may be one battery cell 30 or a plurality of battery cells 30. If there are multiple battery cells 30, the multiple battery cells 30 can be connected in series, in parallel, or in a mixed manner. Mixed connection means that multiple battery cells 30 are connected in series and in parallel. The plurality of battery cells 30 can be directly connected in series or in parallel or mixed together, and then the whole composed of the plurality of battery cells 30 can be accommodated in the box. Alternatively, the plurality of battery cells 30 can be connected in series or in parallel or in a mixed manner. combined to form a battery module 20. A plurality of battery modules 20 are connected in series, parallel, or mixed to form a whole, and are accommodated in the box.
  • a plurality of battery cells 30 are first connected in series, parallel, or mixed to form the battery module 20 .
  • a plurality of battery modules 20 are connected in series, parallel, or mixed to form a whole, and are accommodated in the box.
  • the plurality of battery cells 30 in the battery module 20 can be electrically connected through bus components to realize parallel, series or mixed connection of the plurality of battery cells 30 in the battery module 20 .
  • FIG. 4 is an exploded schematic diagram of the battery cell 30 shown in FIG. 3 .
  • the battery cell 30 provided in the embodiment of the present application includes an electrode assembly 32 and a housing 31.
  • the housing 31 has a receiving cavity 31a, and the electrode assembly 32 is received in the receiving cavity 31a.
  • the housing 31 may include a housing 311 and an end cover 312.
  • the housing 311 is a hollow structure with one side open.
  • the end cover 312 covers the opening 311a of the housing 311 and forms a sealing connection to form a user-friendly structure. in a sealed space containing the electrode assembly 32 and the electrolyte.
  • the electrode assembly 32 When assembling the battery cell 30, the electrode assembly 32 can be first placed into the case 311, and then the end cap 312 is closed to the opening of the case 311, and then the electrolyte is injected into the case through the electrolyte injection port on the end cap 312. Within 311.
  • housing 31 may also be used to contain an electrolyte, such as an electrolyte solution.
  • the housing 31 can have various structural forms.
  • the housing 311 can be in various shapes, such as cylinder, cuboid, etc.
  • the shape of the housing 311 can be determined according to the specific shape of the electrode assembly 32 . For example, if the electrode assembly 32 has a cylindrical structure, the housing 311 can be selected to have a cylindrical structure. If the electrode assembly 32 has a rectangular parallelepiped structure, the housing 311 may have a rectangular parallelepiped structure. In FIG. 4 , as an example, both the housing 311 and the electrode assembly 32 have a rectangular parallelepiped structure.
  • the housing 311 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc., which are not particularly limited in the embodiment of the present application.
  • Electrodes assemblies 32 There may be one or more electrode assemblies 32 accommodated in the housing 311 .
  • FIG. 4 there are two electrode assemblies 32 accommodated in the housing 311 .
  • Figure 5 is a front view of the battery cell shown in Figure 4;
  • Figure 6 is a schematic cross-sectional structural diagram along B-B in Figure 5.
  • the battery cell 30 includes an electrode assembly 32 , a casing 31 and an electrode terminal 33 .
  • the electrode assembly 32 includes an electrode body 321 and a tab 322.
  • the tab 322 is led out from an end of the electrode body 321 along the first direction X.
  • the housing 31 has a receiving cavity 31a, and the electrode assembly 32 is received in the receiving cavity 31a.
  • the housing 31 has a first wall 313.
  • the first wall 313 is located on the side of the tab 322 facing away from the electrode body 321.
  • the first wall 313 has a recess 313a that is concave toward the accommodation cavity 31a along the first direction X.
  • the accommodation cavity 31a has a third A subspace 31b, along the second direction Y, the first subspace 31b is located on at least one side of the recess 313a, the second direction Y intersects the first direction X, and at least part of the tab 322 is accommodated in the first subspace 31b.
  • the electrode terminal 33 is at least partially accommodated in the recess 313 a and is used for electrical connection with the tab 322 .
  • the electrode body 321 can correspond to the part of the electrode plate coated with the active material layer, and its size reflects the capacity of the battery cell 30. When other parameters remain unchanged, the larger the size of the electrode body 321, the corresponding battery cell The capacity of 30 is also larger.
  • the electrode assembly 32 may include one tab 322 , or the electrode assembly 32 may include two tabs 322 .
  • the two tabs 322 can be led out from one end of the electrode body 321 along the first direction X, or the two tabs 322 can be respectively led out from the electrode body 321 along the first direction. Lead out from both ends of X.
  • the housing 31 includes a first wall 313 .
  • the housing 31 includes two first walls 313 , and the two first walls 313 are respectively located on the sides of the two tabs 322 away from the electrode body 321 .
  • the recess 313a is disposed concavely toward the accommodation cavity 31a along the first direction X, then the circumferential side of the recess 313a perpendicular to the first direction
  • the first wall 313 is provided on the side portion.
  • the recess 313a can be provided through the first wall 313 along any one or more directions perpendicular to the first direction X. That is to say, the recess 313a may be provided in a region near the middle of the first wall 313, or the recess 313a may be provided in a region near the edge of the first wall 313.
  • the first subspace 31b is located on at least one side of the recessed portion 313a along the second direction Y, so the first subspace 31b and the recessed portion 313a are arranged side by side along the second direction Y.
  • a protrusion is formed in the area of the first wall 313 corresponding to the first sub-space 31b, the protrusion and the recess 313a are arranged side by side along the second direction Y, and the first sub-space 31b is formed in the area of the first wall 313 corresponding to the protrusion.
  • the first wall 313 can be provided with a recess 313a, and the accommodation cavity 31a has a first sub-space 31b; or, the first wall 313 can be provided with a recess 313a, and the accommodation cavity 31a has two first sub-spaces 31b, Two first sub-spaces 31b are located on both sides of the recess 313a along the second direction Y; alternatively, the first wall 313 can be provided with one recess 313a, and the accommodation cavity 31a has two first sub-spaces 31b, two first sub-spaces 31b. The spaces 31b are respectively located on both sides of the recess 313a along the second direction Y.
  • the second direction Y may be one direction that intersects the first direction X, or it may be two directions that intersect the second direction Y.
  • the first subspace 31b is located on at least one side of any two directions in which the recess 313a intersects with the first direction X respectively.
  • the angle between the first direction X and the second direction Y may be an acute angle, a right angle, an obtuse angle, etc.
  • the first direction X and the second direction Y may be perpendicular to each other.
  • the tab 322 is accommodated in the first sub-space 31b, a part of the tab 322 can be accommodated in the first sub-space 31b, or all of the tab 322 can be accommodated in the first sub-space 31b, depending on the actual situation. Make settings.
  • the electrode terminal 33 and the tab 322 may be directly electrically connected, or the electrode terminal 33 and the tab 322 may be electrically connected through an intermediate conductive member.
  • the electrode terminal 33 may be partially accommodated in the recess 313a, or the electrode terminal 33 may be completely accommodated in the recess 313a. You can choose according to the actual situation.
  • the end surface of the electrode terminal 33 facing away from the first wall 313 may be located outside the recess 313a, or the end surface of the electrode terminal 33 facing away from the first wall 313 may be located within the recess 313a.
  • the battery cell 30 provided in the embodiment of the present application transfers the space on at least one side of the external electrode terminal 33 of the battery cell 30 along the second direction Y to the inside of the battery cell 30 by setting the first sub-space 31b, and connects the tabs At least part of the tab 322 is accommodated in the first sub-space 31b, which is beneficial to reducing the space occupied by the tab 322 along the first direction X inside the battery cell 30. At least part of the tab 322 can be provided in the first sub-hole.
  • the saved space is used to accommodate the electrode body 321, that is, the size of the electrode body 321 along the first direction
  • the depth of the recess 313a along the first direction X is not limited and can be selected according to actual needs.
  • the depth h1 of the recess 313a satisfies: h1 ⁇ 2.5 mm.
  • h1 can be 2.5mm, 2.6mm, 2.8mm or 3mm, etc.
  • the depth of the recess 313a along the first direction X may be the size of the first subspace 31b along the first direction X.
  • the depth of the concave portion 313a is set to satisfy the above relationship, that is, the minimum value of the size of the first subspace 31b along the first direction X is set to 2.5 mm.
  • the sum of the dimensions of the tabs 322 in the battery cell 30 along the first direction In the subspace 31b, reducing the space occupied by the tab 322 in one direction inside the battery cell 30 is conducive to further increasing the size of the electrode body 321 along the first direction X to maximize the capacity of the battery cell 30, thereby increasing the The energy density of the battery cell 30.
  • the distance h2 between the electrode body 321 and the bottom wall of the recess 313a satisfies: h2 ⁇ 3mm.
  • h2 can be 3mm, 2.5mm, 2mm, 1.5mm, 1mm or 0, etc.
  • the electrode body 321 is in contact with the bottom wall of the recess 313a.
  • an insulator may be provided on the side of the bottom wall of the recess 313a facing the accommodation cavity 31a.
  • the distance between the electrode body 321 and the bottom wall of the recess 313a may be zero.
  • the distance between the electrode body 321 and the bottom wall of the recess 313a is set to satisfy the above relationship, so that the tabs 322 are located in the first subspace 31b as much as possible, which is beneficial to increasing the size of the electrode body 321 along the first direction X, and thus The capacity and energy density of the battery cells 30 are improved.
  • the electrode terminal 33 is provided on the bottom wall of the recess 313a, and the end surface of the electrode terminal 33 facing away from the accommodation cavity 31a is located in the recess 313a.
  • the end surface of the electrode terminal 33 facing away from the accommodation cavity 31a may be located inside the recess 313a, or the side of the electrode terminal 33 facing away from the accommodation cavity 31a may be flush with the opening 311a of the recess 313a.
  • Such an arrangement is conducive to making full use of the extra space occupied by the electrode terminals 33 outside the battery cell 30, so that the tabs 322 are arranged as much as possible in the first sub-space 31b along the first direction X, so that the electrode body
  • the size of 321 along the first direction X is as large as possible to increase the capacity and energy density of the battery cell 30 .
  • the electrode terminal 33 is completely located in the recess 313a, it is helpful to reduce the risk of the electrode terminal 33 becoming loose due to scratches, and when the battery cell 30 is subjected to loads such as impact and vibration, these loads will be separated by the first wall 313 and the outer casing.
  • the area corresponding to 31 is borne by the load without being transferred to the electrode terminal 33 , which is beneficial to reducing the vibration, impact and other loads borne by the electrode terminal 33 and maintaining the structural stability of the electrode terminal 33 .
  • the first wall 313 may be a part of the housing 311, or the first wall 313 may be part or all of the end cover 312.
  • a part of the housing 311 may be provided as the first wall 313, and the end cover 312 may be provided.
  • At least part of the cover 312 is a first wall 313 .
  • the housing 31 includes a housing 311 and an end cover 312.
  • the end cover 312 is covered with the housing 311 to form the receiving cavity 31a.
  • the first wall 313 is at least a part of the end cover 312.
  • the first wall 313 is set as a part of the end cover 312, and a recess 313a can be formed on the end cover 312.
  • the electrode assembly 32 is placed into the housing 311, and then the end cover 312 is covered. Compatible with the housing 311.
  • This arrangement helps reduce the processing difficulty of the first wall 313 and reduces the complexity of the assembly process of the battery cell 30.
  • Figure 7 shows an exploded schematic view of the battery 10 provided by another embodiment of the present application.
  • Figure 8 is a partial enlarged view of the M position in Figure 7;
  • Figure 9 is an exploded schematic view of the battery cell 30 in Figure 8.
  • Figure 10 is
  • Figure 8 is a front view of the battery cell 30;
  • Figure 11 is a schematic cross-sectional structural view along N-N in Figure 10.
  • the recess 313 a is disposed through the battery cell 30 along the third direction Z, and the first direction X, the second direction Y, and the third direction Z intersect each other.
  • the angle between the people in the first direction X, the second direction Y, and the third direction Z may be a right angle, an acute angle, an obtuse angle, etc.
  • the first direction X, the second direction Y, and the third direction Z may be set to be perpendicular to each other.
  • the electrode terminals 33 of two adjacent battery cells 30 are usually connected through busbars 40 to achieve series or parallel connection of the corresponding battery cells 30. Therefore, the recessed portion 313a is provided to penetrate the battery cell 30 along the third direction Z, and in the process of connecting the electrode terminals 33 of two adjacent battery cells 30 through the busbar 40, it is convenient for the busbar 40 to pass through the two adjacent battery cells.
  • the recessed portion 313a of the body 30 will not interfere with other components, which is beneficial to improving the stability of the overall structure of the battery 10.
  • the depth h1 of the recess 313a satisfies: h1 ⁇ 6.5 mm.
  • the sum of the portion of the electrode terminal 33 located in the accommodation cavity 31a, the size of the bus piece 40 along the first direction 33, the distance between the end surface of the busbar 40 facing away from the bottom wall of the recess 313a and the bottom wall of the recess 313a is approximately 6.5 mm. If the depth h1 of the recessed portion 313a is ⁇ 6.5mm, the recessed portion 313a has enough space to accommodate the busbar 40 and the electrode terminal 33, that is, the busbar 40 and the electrode terminal 33 are completely located inside the recessed portion 313a.
  • the first wall 313 is a
  • the electrode terminal 33 provides a certain protective effect and reduces the risk that the busbar 40 is scratched by other components and the connection with the electrode terminal 33 fails. When the battery cell 30 is subjected to loads such as impact and vibration, it is difficult for the impact and vibration to be transmitted to the busbar 40 and the terminals of the battery 10 . This is beneficial to further improving the stability of the internal structure of the battery 10 .
  • the two first subspaces 31 b are located on both sides of the recess 313 a along the second direction Y.
  • the electrode assembly 32 may include two pole tabs 322 extending from the same end of the electrode body 321, and the two pole tabs 322 are respectively located in the two first subspaces 31b.
  • the two first electrode terminals 33 are located in the recess 313a.
  • the two electrode terminals 33 can be spaced apart along the third direction Z, or the two electrode terminals 33 can be spaced apart along the second direction Y.
  • the two first electrode terminals 33 can be spaced apart according to the internal structure of the battery cell 30.
  • the arrangement of the electrode assemblies 32 is specifically set.
  • the electrode body 321 has two first surfaces 321a that are oppositely arranged along the second direction Y and two second surfaces 321b that are oppositely arranged along the third direction Z.
  • One surface 321a connects two second surfaces 321b.
  • one of the first surface 321a and the second surface 321b can be set to be a flat surface, and the other can be set to be a curved surface, or both the first surface 321a and the second surface 321b can be set to be a flat surface. You can choose according to actual needs.
  • the area of the first surface 321a is greater than the area of the second surface 321b
  • the battery cell 30 includes a plurality of electrode assemblies 32, and the plurality of electrode assemblies 32 are along the second direction Y. arrangement.
  • the size of the electrode assembly 32 along the third direction Z is larger than the size along the second direction Y.
  • the two tabs 322 of the electrode assembly 32 with opposite polarity can be arranged along the The third direction Z is spaced apart, and multiple electrode assemblies 32 are arranged along the second direction Y, which is beneficial to electrical connection of tabs 322 of the same polarity of different electrode assemblies 32 .
  • Figure 12 shows an exploded schematic diagram of yet another battery 10 provided by an embodiment of the present application.
  • Figure 13 shows a partial enlarged view of position C in Figure 12 .
  • Figure 14 shows the battery cell 30 in Figure 13 Exploded schematic diagram
  • Figure 15 shows the front view of the battery cell 30 in Figure 13
  • Figure 16 shows the schematic cross-sectional structural diagram along D-D in Figure 15.
  • the area of the first surface 321a is smaller than the area of the second surface 321b, and the battery cell 30 includes a plurality of electrode assemblies 32, and the plurality of electrode assemblies 32 are along the third direction Z. arrangement.
  • the size of the electrode assembly 32 along the third direction Z is smaller than the size along the second direction Y.
  • the two tabs 322 of the electrode assembly 32 with opposite signs can be along the third direction Z.
  • Y interval setting in two directions. Arranging multiple electrode assemblies 32 along the third direction Z is beneficial to electrically connecting the tabs 322 of different electrode assemblies 32 with the same polarity.
  • two recesses 313 a are located on both sides of the first subspace 31 b along the second direction Y.
  • the first subspace 31b is located at the middle portion of the first wall 313 along the second direction Y
  • the tab 322 of the electrode assembly 32 is also located at the middle portion of the electrode assembly 32 along the second direction Y.
  • One electrode terminal 33 may be provided in each of the two recessed portions 313a.
  • the electrode body 321 has two first surfaces 321a that are oppositely arranged along the second direction Y and two second surfaces 321b that are oppositely arranged along the third direction Z.
  • the first surface 321a connects the two second surfaces. 321b, the surface area of the first surface 321a is smaller than the surface area of the second surface 321b.
  • the battery cell 30 includes a plurality of electrode assemblies 32 arranged along the third direction Z.
  • the size of the electrode assembly 32 along the second direction Y is larger than the size along the third direction Z.
  • the two tabs 322 with opposite polarity can be arranged along the second direction. Y interval setting. Since the second recess 313a is located on both sides of the first subspace 31b along the second direction Y, the electrode terminal 33 can be positioned on at least one side of the first subspace 31b along the second direction Y.
  • the battery cell 30 includes two electrode terminals 33, and one electrode terminal 33 is disposed in one recess 313a.
  • the two pole tabs 322 of the electrode assembly 32 with opposite polarities are spaced apart in the first sub-space 31b along the second direction Y, and the electrode terminals 33 are provided on both sides of the first sub-space 31b along the second direction Y, there is This facilitates the electrical connection between the electrode terminal 33 and the corresponding tab 322 .
  • the battery cell 30 further includes a current collector 34 connecting the electrode terminal 33 and the tab 322 .
  • the current collector 34 can be in any shape to achieve electrical connection between the connection terminals and the tabs 322 .
  • the current collector 34 may be in the shape of a bent sheet.
  • the battery cell 30 is provided to include a current collector 34, and the electrode terminal 33 and the electrode terminal 33 are connected through the current collector 34.
  • the tabs 322 are beneficial to reducing the difficulty of connecting the electrode terminals 33 and the tabs 322 .
  • the current collector 34 includes a first connection part 341, a second connection part 342 and a bending part 343.
  • the first connection part 341 is connected to the electrode terminal 33, and the second connection part 342 is located in the first sub-space 31b. , and is connected to the tab 322 , and the bent portion 343 connects the first connecting portion 341 and the second connecting portion 342 .
  • one current collector 34 may be provided with one second connection part 342, or one current collector 34 may be provided with two second connection parts 342, which may be based on the arrangement of the electrode assemblies 32 inside the battery cell 30. Method specific settings.
  • the bending part 343 may be in a straight sheet shape, or the bending part 343 may be in an arc shape.
  • the connecting end surface of the tab 322 and the current collector 34 is located in the first sub-space 313a, arranging the second connecting portion 342 in the first sub-space 313a facilitates the electrical connection between the tab 322 and the current collector 34. Since the first connection part 341 is connected to the electrode terminal 33 and is located at the bottom of the recess 313a, the first connection part 341 and the second connection part 342 are spaced apart along the first direction X.
  • the bent portion 343 is provided to facilitate the connection between the first connecting portion 341 and the second connecting portion 342 .
  • the current collector 34 includes two second connection parts 342 and two bending parts 343 .
  • the two second connection parts 342 are located on both sides of the first connection part 341 .
  • the two bending parts 343 connect the brightness of the first connection part 341 and the second connection part 342 respectively.
  • the current collector 34 is provided to include two second connecting portions. 342. Connect the tabs 322 of different electrode assemblies 32 with the same polarity on both sides of the recess 313a through two second connecting parts 342.
  • a second connecting portion 342 can be connected to the tab 322 of one electrode assembly 32 , or a second connecting portion 342 is provided to connect the tabs 322 of multiple electrode assemblies 32 with the same polarity.
  • the current collector 34 is provided to include two second connecting portions 342 and two bent portions 343 to facilitate electrical connection between the electrode terminal 33 and the tabs 322 of the same polarity located on both sides of the electrode terminal 33 .
  • the battery 10 provided according to the embodiment of the present application includes the battery cell 30 provided in any of the above embodiments.
  • the battery 10 provided according to the embodiment of the present application uses the battery cell 30 provided in any of the above embodiments, and therefore has the same technical effect, which will not be described again here.
  • the battery 10 further includes a bus 40 connecting the electrode terminals 33 of adjacent battery cells 30 and the bus 40 is located in the recess 313a.
  • the busbar 40 is located in the recess 313a, that is, the busbar 40 does not protrude from the recess 313a and is arranged along the first wall 313 on either side of the vertical first direction X.
  • the first wall 313 of the battery cell 30 can be placed in the box of the battery 10. Since the busbar 40 is located inside the recess 313a, it can pass through the side of the recess 313a.
  • the first wall 313 bears the weight of the battery cell 313, and the first wall 313 on the side of the recess 313a has a large contact area with the box and is supported by a plane. Therefore, there is no need to install additional support components to realize the battery cell.
  • the batteries 30 are stably arranged inside the box, which not only improves the connection stability between the battery cells 30 and the box, but also helps simplify the internal structure of the battery 10 .
  • the battery 10 includes a plurality of battery cells 30.
  • the end cover 312 of the battery cell 30 has a recess 313a that is concave along the first direction X toward the accommodation cavity 31a.
  • the accommodation cavity 31a has a recess along the second direction Y and
  • the first subspace 31b of the recessed portion 313a is arranged side by side, and the two first subspaces 31b are located on both sides of the recessed portion 313a along the second direction Y, or the two recessed portions 313a are located on both sides of the first subspace 31b along the second direction.
  • As much of the tab 322 as possible is accommodated in the first subspace 31b.
  • the electrode terminal 33 is provided in the recessed portion, the recessed portion 313a is provided through the third direction Z, and the current collector 34 is bent and connected to the electrode terminal 33 and the tab 322 .
  • the distance between the electrode body 321 and the end cap 312 is less than or equal to 2 mm.
  • a plurality of battery cells 30 are arranged along the third direction Z.
  • the busbar 40 connects the electrode terminals 33 of two adjacent battery cells 30 and the busbar 40 is completely accommodated in the recess 313a.
  • the battery 30 provided by the embodiment of the present application transfers part of the extra space outside the battery cell 30 occupied by the electrode terminals 33 and busbars 40 into the first subspace 31b inside the battery cell 30, and utilizes
  • the first subspace 31b accommodates the tabs 322 to increase the size of the electrode body 321, which is beneficial to increasing the capacity of the battery cell 30 and thereby increasing the energy density of the battery 10.
  • the electrode terminal 33 and the bus piece 40 are accommodated in the recess 313a, it is helpful to reduce the risk of the electrode terminal 33 and the bus piece 40 being misaligned due to scratches, and to improve the connection stability of the electrode terminal 33 and the bus piece 40.
  • the end cover 312 of the battery cell 30 can be placed in the box. Since the end cover 312 is in surface contact with the box and the contact area is large, the end cover 312 can be used to assemble the battery cell 30 Providing a certain supporting function without the need to provide additional supporting members to support the battery cells 30 is beneficial to simplifying the internal structure of the battery 10 .
  • the electrical device provided according to the embodiment of the present application includes the battery 10 provided in any of the above embodiments, and the battery 10 is used to provide electric energy.

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

Abstract

La présente demande concerne un élément de batterie, une batterie et un dispositif électrique. L'élément de batterie comprend un ensemble électrode, un boîtier et une borne d'électrode ; l'ensemble électrode comprend un corps d'électrode et une languette, et la languette sort de l'extrémité du corps d'électrode dans une première direction ; le boîtier est pourvu d'une cavité de réception, et l'ensemble électrode est reçue dans la cavité de réception ; le boîtier est pourvu d'une première paroi, la première paroi est située sur le côté de la languette tourné à l'opposé du corps d'électrode, et la première paroi est pourvue d'une partie évidée enfoncée vers la cavité de réception dans la première direction ; la cavité de réception est pourvue d'un premier sous-espace, le premier sous-espace est situé sur au moins un côté de la partie enfoncée dans une seconde direction, la seconde direction coupe la première direction, et au moins une partie de la languette est reçue dans le premier sous-espace ; la borne d'électrode est utilisée pour être électriquement connectée à la languette, et est au moins partiellement reçue dans la partie enfoncée. Selon l'élément de batterie prévu par des modes de réalisation de la présente demande, la densité d'énergie d'éléments de batterie peut être améliorée.
PCT/CN2022/116225 2022-08-31 2022-08-31 Élément de batterie, batterie et dispositif électrique WO2024045048A1 (fr)

Priority Applications (1)

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PCT/CN2022/116225 WO2024045048A1 (fr) 2022-08-31 2022-08-31 Élément de batterie, batterie et dispositif électrique

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PCT/CN2022/116225 WO2024045048A1 (fr) 2022-08-31 2022-08-31 Élément de batterie, batterie et dispositif électrique

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015141798A (ja) * 2014-01-28 2015-08-03 株式会社豊田自動織機 蓄電装置
CN105960693A (zh) * 2014-02-05 2016-09-21 住友电气工业株式会社 蓄电设备
JP2018092726A (ja) * 2016-11-30 2018-06-14 株式会社豊田自動織機 蓄電装置
CN110797478A (zh) * 2018-08-01 2020-02-14 宁德时代新能源科技股份有限公司 二次电池
CN112310514A (zh) * 2020-10-27 2021-02-02 合肥国轩高科动力能源有限公司 锂离子电池

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015141798A (ja) * 2014-01-28 2015-08-03 株式会社豊田自動織機 蓄電装置
CN105960693A (zh) * 2014-02-05 2016-09-21 住友电气工业株式会社 蓄电设备
JP2018092726A (ja) * 2016-11-30 2018-06-14 株式会社豊田自動織機 蓄電装置
CN110797478A (zh) * 2018-08-01 2020-02-14 宁德时代新能源科技股份有限公司 二次电池
CN112310514A (zh) * 2020-10-27 2021-02-02 合肥国轩高科动力能源有限公司 锂离子电池

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