WO2024000502A1 - Batterie et dispositif électrique - Google Patents

Batterie et dispositif électrique Download PDF

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Publication number
WO2024000502A1
WO2024000502A1 PCT/CN2022/103099 CN2022103099W WO2024000502A1 WO 2024000502 A1 WO2024000502 A1 WO 2024000502A1 CN 2022103099 W CN2022103099 W CN 2022103099W WO 2024000502 A1 WO2024000502 A1 WO 2024000502A1
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WO
WIPO (PCT)
Prior art keywords
battery
battery cells
box
wall
adhesive layer
Prior art date
Application number
PCT/CN2022/103099
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English (en)
Chinese (zh)
Inventor
李星
张辰辰
金海族
李振华
牛少军
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/CN2022/103099 priority Critical patent/WO2024000502A1/fr
Publication of WO2024000502A1 publication Critical patent/WO2024000502A1/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
    • H01M50/20—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
    • 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
    • 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, specifically, to a battery and electrical equipment.
  • lithium-ion batteries As a rechargeable battery, lithium-ion batteries have the advantages of small size, high energy density, high power density, many cycles and long storage time.
  • the battery generally includes a case and a battery cell, and the battery cell is contained in the case.
  • the full utilization of the internal space of the box by the battery cells is conducive to improving the energy density of the battery, thereby meeting the power demand. Therefore, how to ensure the capacity density of batteries has become an urgent problem to be solved in the field of battery technology.
  • Embodiments of the present application provide a battery and electrical equipment to improve the energy density of the battery.
  • embodiments of the present application provide a battery, which includes a box and a plurality of battery cells.
  • An accommodation space is formed inside the box; the plurality of battery cells are accommodated in the accommodation space; the volume of the accommodation space is V, and the battery
  • the number of cells is n, and the volume of the battery cell is V 1 , which satisfies 35% ⁇ nV 1 /V ⁇ 95%.
  • the volume V of the box's accommodation space, the number of battery cells n and the volume V 1 of the battery cells satisfy 35% ⁇ nV 1 /V ⁇ 95%, ensuring that the sum of the volumes of all battery cells is occupied 35% to 95% of the volume of the accommodation space, thereby making full use of the internal space of the box to increase the energy density of the battery.
  • the battery cells do not completely occupy the accommodation space, providing enough space for the battery cells to be installed and fixed in the box and for the battery cells to dissipate heat, thus ensuring the reliability and safety of the overall battery structure.
  • 50% ⁇ nV 1 /V ⁇ 80% that is, the sum of the volumes of all battery cells occupies 50% to 80% of the volume of the accommodation space, thereby making full use of the internal space of the box to improve the performance of the battery.
  • Energy Density the battery cells do not completely occupy the accommodation space, providing enough space for the battery cells to be installed and fixed in the box and for the battery cells to dissipate heat, thus ensuring the reliability and safety of the overall battery structure.
  • the battery includes a plurality of battery cells arranged to form a battery pack.
  • the battery also includes a first adhesive layer, and the battery pack is bonded to the box through the first adhesive layer. .
  • the battery cells are bonded and fixed in the box through the first adhesive layer.
  • the first adhesive layer occupies less space inside the box, so that the box's accommodation space can accommodate more battery cells, which is beneficial to improving the energy density of the battery.
  • the battery pack has a first surface for bonding with the box, the area of the first surface is S, and the area of the first adhesive layer in contact with the first surface is S 1 , satisfy: S 1 ⁇ 0.4S.
  • the area S of the first surface of the battery pack used for bonding with the box and the area S 1 of the first adhesive layer in contact with the first surface satisfy S 1 ⁇ 0.4S, so that the battery pack and the box There is sufficient connection strength between them to improve the stability of the connection between the battery pack and the box.
  • S 1 ⁇ 0.6S.
  • S 1 ⁇ 0.6S makes the connection strength between the battery pack and the box better, and further improves the connection stability between the battery pack and the box.
  • the battery cell includes a casing, an end cover and an electrode terminal, the casing has an opening, the end cover is used to cover the opening, and the electrode terminal is disposed on the end cover; at least part of the battery cell Parts of the outer surfaces of the housing together form a first surface.
  • At least part of the outer surfaces of the casings of the battery cells jointly form the first surface. It can be understood that at least part of the outer surfaces of the casings of the battery cells are bonded to the box, so that the battery pack It is more convenient to bond with the box body, and it can avoid interference between the first glue layer and the structure on the end cover (such as electrode terminals, pressure relief mechanism) to affect the bonding performance of the first glue layer and/or affect the structure on the end cover. play its role.
  • the bonding strength P of the first adhesive layer satisfies: P ⁇ 6Mpa.
  • the bonding strength P of the first glue layer satisfies: P ⁇ 6Mpa, so that the first glue layer has strong bonding ability, thereby improving the bonding stability between the battery pack and the box.
  • P ⁇ 9MPa In some embodiments of the first aspect of the application, P ⁇ 9MPa.
  • the first adhesive layer with P ⁇ 9MPa has strong bonding ability, thereby improving the bonding stability between the battery pack and the box.
  • the thickness M of the first adhesive layer satisfies: 0.1mm ⁇ M ⁇ 6mm.
  • 0.1mm ⁇ M ⁇ 6mm ensures that the first adhesive layer has a good connection strength between the battery pack and the box, so that the volume of the first adhesive layer is smaller, thereby reducing the first
  • the glue layer occupies the accommodation space of the box, thereby leaving more space for the accommodation space to accommodate battery cells, which is beneficial to improving the energy density of the battery.
  • 0.5mm ⁇ M ⁇ 3mm In the above technical solution, 0.5mm ⁇ M ⁇ 3mm.
  • the connection strength of the first adhesive layer is better, ensuring a better connection strength between the battery pack and the box, making the volume of the first adhesive layer smaller. Small, thereby reducing the occupation of the accommodation space of the box by the first adhesive layer, thereby leaving more space for the accommodation space to accommodate battery cells, which is beneficial to improving the energy density of the battery.
  • 0.5mm ⁇ M ⁇ 3mm can also make the first adhesive layer have a certain buffering performance between the battery pack and the box, reducing the risk of battery cells being damaged by impact.
  • the weight of the first adhesive layer is W 1 and the weight of the battery is W 2 , satisfying: 0.0001 ⁇ W 1 /W 2 ⁇ 0.001.
  • 0.0001 ⁇ W 1 /W 2 ⁇ 0.001 ensures that the first adhesive layer ensures a good connection strength between the battery pack and the box, so that the weight of the first adhesive layer accounts for the weight of the entire battery.
  • the specific gravity is smaller, thereby reducing the occupation of the accommodation space of the box by the first adhesive layer, thereby leaving more space for the accommodation space to accommodate the battery cells, which is beneficial to improving the energy density of the battery.
  • the weight of the first adhesive layer is W 1
  • the sum of the weights of multiple battery cells is W 3 , which satisfies: 0.0004 ⁇ W 1 /W 3 ⁇ 0.002.
  • the battery further includes a support member;
  • the battery cell includes a casing and an electrode terminal, the casing includes a first wall for installing the electrode terminal, and along the thickness direction of the first wall, the box includes A second wall opposite the first wall, the support member being supported between the first wall and the second wall.
  • the support member is supported between the first wall of the battery cell and the second wall of the box, which can improve the stability of the battery cell being installed in the box.
  • the support member includes a first support part, a second support part and a first connection part, the first connection part is attached to the second wall, and along the preset direction, the first support part The second support part is spaced apart and connected to the first connection part. One end of the first support part facing away from the first connection part and one end of the second support part facing away from the first connection part are respectively connected with the first ends of the two adjacent battery cells. wall attachment.
  • the support member can be attached to the first wall of two adjacent battery cells to improve the connection stability of the two adjacent battery cells in the box. Moreover, one support member can support two adjacent battery cells, and fewer support members can be used to support multiple battery cells, thereby reducing the impact of the arrangement of the support members on the energy density of the battery.
  • the battery further includes a second glue layer, and the support member and the first wall are connected through the second glue layer.
  • the support member and the first wall are connected through the second glue layer, which can maintain a stable support relationship between the support member and the first wall, improve the ability of vibration, impact and other external forces, thereby reducing the impact of the support member on the battery cells. Risk of body support failure.
  • embodiments of the present application provide an electrical device, including the battery provided in any embodiment of the first aspect.
  • Figure 1 is a schematic structural diagram of a vehicle provided by some embodiments of the present application.
  • Figure 2 is an exploded view of a battery provided by some embodiments of the present application.
  • Figure 3 is an exploded view of a battery provided by other embodiments of the present application.
  • Figure 4 is an exploded view of a battery provided by some embodiments of the present application.
  • FIG. 5 is a schematic structural diagram of a battery module provided by some embodiments of the present application.
  • Figure 6 is a cross-sectional view of a battery provided by some embodiments of the present application.
  • Figure 7 is a cross-sectional view of a battery provided by other embodiments of the present application.
  • Figure 8 is an exploded view of a battery cell provided by some embodiments of the present application.
  • Figure 9 is a schematic diagram of multiple battery cells arranged to form a battery pack according to some embodiments of the present application.
  • Figure 10 is a schematic diagram of multiple battery cells arranged to form a battery pack according to other embodiments of the present application.
  • Figure 11 is a schematic diagram of multiple battery cells arranged to form a battery pack according to some embodiments of the present application.
  • Figure 12 is a cross-sectional view of a battery provided by some embodiments of the present application.
  • Figure 13 is a cross-sectional view of a battery provided by other embodiments of the present application.
  • Figure 14 is a schematic structural diagram of a support provided by some embodiments of the present application.
  • Figure 15 is a cross-sectional view of a battery provided by some embodiments of the present application.
  • Figure 16 is a cross-sectional view of a battery provided by some further embodiments of the present application.
  • Icon 1000-vehicle; 100-battery; 10-box; 11-accommodation space; 12-first part; 13-second part; 14-second wall; 20-battery cell; 21-casing; 211-shell Body; 2111-opening; 212-end cover; 213-first wall; 22-electrode assembly; 221-pole tab; 221a-positive pole tab; 221b-negative pole tab; 23-electrode terminal; 23a-positive electrode terminal; 23b-negative electrode terminal; 24-current collecting member; 25-pressure relief mechanism; 26-liquid injection hole; 20a-battery module; 20b-battery pack; 21b-first surface; 30-pressure plate; 40-collection component; 50 -First glue layer; 60-heat dissipation structure; 70-support member; 80-second glue layer; 200-controller; 300-motor. X-first direction; Y-second direction; third direction.
  • the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of this application is commonly placed when used, or the orientation or positional relationship of this application.
  • the orientation or positional relationship commonly understood by those skilled in the art is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.
  • the terms “first”, “second”, “third”, etc. are only used to distinguish descriptions and shall not be understood as indicating or implying relative importance.
  • Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles and electric cars, as well as in many fields such as military equipment and aerospace. . As the application fields of power batteries continue to expand, their market demand is also constantly expanding.
  • the battery includes a box body with a plurality of battery cells, and the box body forms an accommodation space for accommodating the plurality of battery cells.
  • the battery cells also include other structures accommodated in the accommodation space, such as the connection structure for installing the battery cells in the box, the heat dissipation structure to assist the battery cells in dissipating heat, etc.
  • the volume of the accommodation space of the battery box is V
  • the battery cell The number is n
  • the volume of the battery cell is V 1 , which satisfies, 35% ⁇ nV 1 /V ⁇ 95%.
  • the volume V of the box s accommodation space, the number n of battery cells, and the volume V 1 of the battery cells satisfy 35% ⁇ nV 1 /V ⁇ 95%, ensuring that the sum of the volumes of all battery cells occupies the volume of the accommodation space. 35% to 95%, thereby making full use of the internal space of the box to increase the energy density of the battery.
  • the battery cells do not completely occupy the accommodation space, which provides enough space for the battery cells to be installed and fixed in the box and for the battery cells to dissipate heat, thus ensuring the reliability and safety of the overall battery structure.
  • the batteries disclosed in the embodiments of the present application can be, but are not limited to, used in electrical equipment such as vehicles, ships, or aircrafts. They can also be used in power systems that include the batteries disclosed in the present application to form the electrical equipment. In this way, the energy density of the battery is relatively high. High and the reliability and safety of the battery are better.
  • Embodiments of the present application provide an electrical device that uses a battery as a power source.
  • the electrical device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric vehicle, a ship, a spacecraft, etc.
  • electric toys can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, electric airplane toys, etc.
  • spacecraft can include airplanes, rockets, space shuttles, spaceships, etc.
  • an electrical device is a vehicle 1000 as an example.
  • FIG. 1 is a schematic structural diagram of a vehicle 1000 provided by some embodiments of the present application.
  • the vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc.
  • the battery 100 is disposed inside the vehicle 1000 , and the battery 100 may be disposed at the bottom, head, or tail of the vehicle 1000 .
  • the battery 100 may be used to power the vehicle 1000 , for example, the battery 100 may serve as an operating power source for the vehicle 1000 .
  • the vehicle 1000 may also include a controller 200 and a motor 300 .
  • the controller 200 is used to control the battery 100 to provide power to the motor 300 , for example, for starting, navigating and driving the vehicle 1000 .
  • the battery 100 can not only be used as an operating power source for the vehicle 1000 , but also can be used as a driving power source for the vehicle 1000 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000 .
  • the battery 100 includes a case 10 and battery cells 20 , and the battery cells 20 are accommodated in the case 10 .
  • the box 10 is used to provide a receiving space 11 for the battery cells 20, and the box 10 can adopt a variety of structures.
  • the box 10 may include a first part 12 and a second part 13 , the first part 12 and the second part 13 covering each other, the first part 12 and the second part 13 jointly defining a space for accommodating the battery cells 20 Accommodation space 11.
  • the first part 12 and the second part 13 may also be hollow structures with one side open to form a receiving cavity for accommodating the battery cells 20 , and the open side of the first part 12 is covered with the second part 13 . Open side.
  • the second part 13 may be a hollow structure with one end open to form a receiving cavity for accommodating the battery cells 20 .
  • the first part 12 may be a plate-like structure, and the first part 12 covers the open side of the second part 13 , so that the first part 12 and the second part 13 jointly define the accommodation space 11 .
  • the box 10 formed by the first part 12 and the second part 13 can be in various shapes, such as cylinder, rectangular parallelepiped, etc.
  • the battery 100 further includes a pressure plate 30, which is used to press all the battery cells 20 against the second part 13, so as to lower the battery cells 20 into the box. Risks of activities within 10 days.
  • the battery 100 there may be a plurality of battery cells 20, and the plurality of battery cells 20 may be connected in series, in parallel, or in mixed connection.
  • Mixed connection means that the plurality of battery cells 20 are connected in series and in parallel.
  • the plurality of battery cells 20 can be directly connected in series or in parallel or mixed together, and then the whole composed of the plurality of battery cells 20 can be accommodated in the box 10 ; of course, the battery 100 can also be a plurality of battery cells 20
  • the battery modules 20a are first connected in series, parallel, or mixed, and then multiple battery modules 20a are connected in series, parallel, or mixed to form a whole, and are accommodated in the box 10 .
  • the battery 100 may also include other structures. For example, as shown in FIG.
  • the battery 100 may further include a bus component 40 for realizing electrical connections between multiple battery cells 20 .
  • the battery 100 there may be a plurality of battery cells 20, and the plurality of battery cells 20 may be connected in series, in parallel, or in mixed connection.
  • Mixed connection means that the plurality of battery cells 20 are connected in series and in parallel.
  • the plurality of battery cells 20 can be directly connected in series or in parallel or mixed together, and then the whole composed of the plurality of battery cells 20 can be accommodated in the box 10 ; of course, the battery 100 can also be a plurality of battery cells 20
  • the battery modules 20a are first connected in series, parallel, or mixed, and then multiple battery modules 20a are connected in series, parallel, or mixed to form a whole, and are accommodated in the box 10 .
  • the battery 100 may also include other structures.
  • the battery 100 may further include a bus component 40 for realizing electrical connections between multiple battery cells 20 .
  • a state in which a plurality of battery cells 20 are not connected in series, parallel or mixed together through the bus 40 is defined as the battery pack 20b.
  • the battery cell 20 may be a secondary battery or a primary battery; it may also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto.
  • the battery cell 20 may be in the shape of a cylinder, a flat body, a rectangular parallelepiped or other shapes.
  • FIG. 5 shows that the battery cell 20 has a rectangular parallelepiped shape.
  • the battery 100 includes a box 10 and a plurality of battery cells 20.
  • An accommodating space 11 is formed inside the box 10; the plurality of battery cells 20 are accommodated in the accommodating space 11; the volume of the accommodating space 11 is V , the number of battery cells 20 is n, the volume of battery cells 20 is V 1 , and satisfies 35% ⁇ nV 1 /V ⁇ 95%.
  • Other structures in the box 10 occupy 5% to 65% of the accommodation space 11 .
  • Other structures refer to other structures in the box 10 other than the battery cells 20 .
  • Other structures include but are not limited to the connection structures located in the box 10 to install the battery cells 20 in the box 10 , and help the battery cells 20 dissipate heat.
  • the heat dissipation structure 60 (shown in Figure 7).
  • nV 1 /V ⁇ 35% the accommodation space 11 occupied by other structures in the box 10 is too large, and the accommodation space 11 used to accommodate the battery cells 20 is smaller, resulting in the battery 100 having low energy density, low power, and low cost. high.
  • nV 1 /V>95% although the accommodating space 11 of the box 10 is used to accommodate the battery cells 20 is larger, the energy density of the battery 100 is larger, but other structures occupy smaller spaces, which may lead to the connection structure The connection strength is insufficient, the heat dissipation structure 60 (shown in FIG. 7 ) has poor heat dissipation capabilities, and other problems, thereby reducing the reliability and safety of the battery 100.
  • nV 1 /V can be 40%, 45%, 50%, 55%, 60%, 70%, 75%, 80%, 85%, 90%, etc.
  • the volume V of the accommodation space 11 of the box 10 , the number n of the battery cells 20 and the volume V 1 of the battery cells 20 satisfy 35% ⁇ nV 1 /V ⁇ 95%, ensuring that the volume of all battery cells 20 is and occupy 35% to 95% of the volume of the accommodation space 11 , thereby making full use of the internal space of the box 10 to increase the energy density of the battery 100 .
  • the battery cells 20 do not completely occupy the accommodation space 11 , which provides enough space for the battery cells 20 to be installed and fixed in the box 10 and for heat dissipation of the battery cells 20 , thereby ensuring the reliability and safety of the overall structure of the battery 100 .
  • nV 1 /V can be 52%, 53%, 54%, 56%, 58%, 62%, 63%, 64%, 66%, 68%, 72%, 74%, 76%, 78%, etc. .
  • 50% ⁇ nV 1 /V ⁇ 80% that is, the sum of the volumes of all battery cells 20 occupies 50% to 80% of the volume of the accommodation space 11 , thereby making full use of the internal space of the box 10 to increase the energy of the battery 100 density.
  • the battery cells 20 do not completely occupy the accommodation space 11 , which provides enough space for the battery cells 20 to be installed and fixed in the box 10 and for heat dissipation of the battery cells 20 , thereby ensuring the reliability and safety of the overall structure of the battery 100 .
  • the battery 100 includes a plurality of battery cells 20 arranged to form a battery pack 20b.
  • the battery 100 also includes a first glue layer 50.
  • the battery pack 20b The first glue layer 50 is bonded to the box body 10 .
  • the battery pack 20b refers to a whole body in which all the battery cells 20 are arranged in a certain manner and are not connected in series, parallel, or mixed through the bus part 40 .
  • the plurality of battery cells 20 are arranged along the first direction X, the second direction Y and the third direction to form a battery pack 20b, where , forming two rows in the first direction X, two rows in the second direction Y, and seven columns in the third direction.
  • the first direction X, the second direction Y and the third direction are vertical in pairs.
  • all battery cells 20 may be stacked in rows along the first direction X to form a battery pack 20b.
  • the battery pack 20b and the box 10 are bonded through the first glue layer 50, which means that at least part of the outer surface of the battery pack 20b and the inner surface of the box 10 are bonded through the first glue layer 50, or the outer surface of the battery pack 20b At least part of the surface of other structures located in the box 10 (such as the surface of the heat dissipation structure 60 (shown in FIG. 7 )) is bonded through the first adhesive layer 50 , thereby indirectly fixing the battery pack 20b in the box 10 .
  • the outer surface of the battery pack 20b refers to the general name of the surface that can still be seen after a plurality of battery cells 20 are arranged. For example, as shown in FIG. 5 , along the first direction The surface, and the surface of the two battery cells 20 located at the endmost portions along the first direction X away from the adjacent battery cells 20 can be seen, is part of the outer surface of the battery pack 20b.
  • the first glue layer 50 may be formed by coating. When the fluid first glue layer 50 is solidified, the battery pack 20b and the box 10 are connected. Before the first glue layer 50 is bonded between the battery pack 20b and the box 10, the first glue layer 50 may be a solid adhesive tape.
  • the battery cells 20 are bonded and fixed in the box 10 through the first adhesive layer 50 . Through bonding, the battery cells 20 are more convenient to install and fix in the box 10 , compared to being fixed in the box 10 through the beam structure.
  • the battery cells 20 and the first adhesive layer 50 occupy less space inside the box 10 , so that the accommodation space 11 of the box 10 can accommodate more battery cells 20 , which is beneficial to improving the energy density of the battery 100 .
  • the battery pack 20b has a first surface 21b for bonding with the box 10.
  • the area of the first surface 21b is S, and the first adhesive layer 50 is connected to the first surface 21b.
  • the contact area of one surface 21b is S 1 , which satisfies: S 1 ⁇ 0.4S.
  • At least a portion of the outer surface of the battery pack 20b forms the first surface 21b.
  • the area S of the first surface 21b of the battery pack 20b used for bonding with the box 10 and the area S 1 of the first adhesive layer 50 in contact with the first surface 21b satisfy S 1 ⁇ 0.4S, so that the first adhesive layer 50
  • the contact area with the first surface 21b of the battery pack 20b is large, and the contact area between the first adhesive layer 50 and the box 10 or other structures in the box 10 is large, so that there is a large gap between the battery pack 20b and the box 10 It has sufficient connection strength to improve the connection stability between the battery pack 20b and the box 10.
  • the area S of the first surface 21b and the area S 1 of the first adhesive layer 50 in contact with the first surface 21b can also satisfy other relationships, for example, 0.5S ⁇ S 1 ⁇ 0.58S.
  • the battery cell 20 may include a housing 21 and an electrode assembly 22 .
  • the electrode assembly 22 is accommodated in the housing 21 .
  • the housing 21 includes a housing 211 and an end cover 212 .
  • the housing 211 has an opening 2111 .
  • the end cover 212 is used to cover the opening 2111 of the housing 211 to form a receiving portion for accommodating the electrode assembly 22 .
  • the housing 21 can be in various shapes, such as cylinder, cuboid, etc.
  • the shape of the housing 21 can be determined according to the specific shape of the electrode assembly 22 .
  • the housing 21 can have a cylindrical structure; if the electrode assembly 22 has a rectangular parallelepiped structure, the housing 21 can have a rectangular parallelepiped structure.
  • FIG. 8 exemplarily shows the case where the housing 21 and the electrode assembly 22 are rectangular parallelepipeds.
  • the outer casing 21 can also 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.
  • the electrode assembly 22 may include a positive electrode sheet (not shown), a negative electrode sheet (not shown), and a separation film (not shown).
  • the electrode assembly 22 may be a rolled structure formed by winding a positive electrode sheet, a separator film, and a negative electrode sheet, or may be a stacked structure formed by a stacked arrangement of positive electrode sheets, a separator film, and a negative electrode sheet.
  • the electrode assembly 22 also includes a positive electrode tab 221a (not shown in the figure) and a negative electrode tab 221b (not shown in the figure).
  • the positive electrode tab 221a can be a positive electrode current collector that is not coated with a positive electrode active material layer in the positive electrode sheet.
  • the negative electrode current collector that is not coated with the negative electrode active material layer in the negative electrode sheet serves as the negative electrode tab 221b.
  • the accommodating part is also used to accommodate electrolyte, such as electrolyte solution.
  • the end cap 212 is provided with an electrode terminal 23.
  • the electrode terminal 23 serves as a component for outputting electric energy of the electrode assembly 22.
  • the electrode terminal 23 is used for electrical connection with the electrode assembly 22, that is, the electrode terminal 23 is electrically connected to the tab 221 of the electrode assembly 22.
  • the electrode terminal 23 and the tab 221 are connected through the current collecting member 24 to realize the electrical connection between the electrode terminal 23 and the tab 221 .
  • the opening 2111 of the housing 211 may be one or two. If there is one opening 2111 of the housing 21, there can also be one end cover 212. Two electrode terminals 23 can be provided on the end cover 212. The two electrode terminals 23 are respectively used to connect the positive electrode tab 221a and the negative electrode tab of the electrode assembly 22. 221b is electrically connected, and the two electrode terminals 23 in the end cap 212 are the positive electrode terminal 23a and the negative electrode terminal 23b respectively. As shown in FIG. 3 , if the housing 211 has two openings 2111 , for example, the two openings 2111 are provided on opposite sides of the housing 211 , there can also be two end caps 212 , and the two end caps 212 are closed respectively.
  • the electrode terminal 23 in one end cap 212 may be a positive electrode terminal 23a for electrical connection with the positive tab 221a of the electrode assembly 22; the electrode terminal 23 in the other end cap 212 may be a negative electrode.
  • the terminal 23b is used for electrical connection with the negative electrode piece of the electrode assembly 22.
  • the end cover 212 is also provided with a pressure relief mechanism 25 , which is used to relieve the pressure inside the battery cell 20 .
  • the pressure relief mechanism 25 can be an explosion-proof valve or a weak point.
  • a liquid injection hole 26 may also be provided on the end cover 212 , and the liquid injection hole 26 is used for introducing electrolyte into the interior of the battery cell 20 .
  • the battery cell 20 includes a housing 211, an end cover 212 and an electrode terminal 23.
  • the housing 211 has an opening 2111, the end cover 212 is used to cover the opening 2111, and the electrode terminal 23 is provided on the end cover 212; at least Parts of the outer surfaces of the casings 211 of the battery cells 20 jointly form the first surface 21b.
  • the outer surface of the casing 211 of the battery cell 20 Since no other structure is provided on the outer surface of the casing 211 of the battery cell 20 , and the outer surface of the casing 211 has a large area, at least part of the outer surface of the casing 211 of the battery cell 20 jointly forms the first surface 21 b , so that the first surface 21b of the battery pack 20b used for bonding with the case 10 is large enough to provide a sufficient contact area for connection with the case 10.
  • the first surface 21b is formed in different ways. As shown in Figures 9 and 10, after multiple battery cells 20 are arranged, the outer surface of the casing 211 of each battery cell 20 is partially exposed so that it can be seen, then the outer surface of the casing 211 of all battery cells 20 Parts of the outer surfaces together form the first surface 21b.
  • the outer surfaces of the end cap 212 and structures provided on the end cap 212 do not participate in forming the first surface 21b.
  • the surface of the end cover 212 facing away from the inside of the battery cell 20 may participate in forming the first surface 21b, and the first glue layer 50 is provided between the surface of the end cover 212 facing away from the inside of the battery cell 20 and the box 10 It is sufficient to avoid the structures (such as electrode terminals 23, liquid injection holes 26, pressure relief mechanism 25, etc.) provided on the end cover 212.
  • At least part of the outer surfaces of the casing 211 of the battery cells 20 jointly form the first surface 21b. It can be understood that at least part of the outer surfaces of the casing 211 of the battery cells 20 are bonded to the box 10, so that the battery
  • the bonding between the group 20b and the box body 10 is more convenient, and can avoid interference between the first glue layer 50 and the structure (such as the electrode terminal 23) on the end cover 212 to affect the bonding performance of the first glue layer 50 and/or affect the end cover.
  • the structure on the 212 does its job.
  • the bonding strength P of the first adhesive layer 50 satisfies: P ⁇ 6Mpa.
  • Bonding strength refers to the bonding force per unit bonding area.
  • the bonding strength of the first glue layer 50 mainly includes the cohesive strength of the first glue layer 50 and the bonded surface (the first surface 21 b and the inner surface of the box 10 or the first surface 21 b and the box). The bonding strength between the surfaces of other structures within the body 10). The greater the bonding strength, the better the bonding stability; the smaller the bonding strength, the weaker the bonding stability.
  • the bonding strength P of the first adhesive layer 50 may be 8Mpa, 10Mpa, 12Mpa, 15Mpa, 20Mpa, 25Mpa, 30Mpa, etc.
  • the bonding strength P of the first glue layer 50 satisfies: P ⁇ 6Mpa, so that the first glue layer 50 has strong bonding ability, thereby improving the bonding stability between the battery pack 20b and the box 10.
  • the bonding strength P of the first adhesive layer 50 can be 9.5Mpa, 11.5Mpa, 12.5Mpa, 14Mpa, 23Mpa, 28Mpa, 32Mpa, 40Mpa, etc.
  • the first adhesive layer 50 with P ⁇ 9MPa has strong bonding ability, thereby improving the bonding stability between the battery pack 20b and the box 10.
  • the thickness M of the first adhesive layer 50 satisfies: 0.1mm ⁇ M ⁇ 6mm.
  • the thickness of the first adhesive layer 50 refers to the distance between the two bonding surfaces to which it is bonded. As shown in FIG. 6 , in an embodiment in which the two bonding points to the first glue layer 50 are the first surface 21 b and the inner surface of the box 10 , the thickness of the first glue layer 50 is the first surface 21 b and the straight-line distance between the inner surface of the box 10 and the opposite inner surface of the box 10 . As shown in FIG. 7 , in an embodiment in which the two adhesive layers bonded to the first adhesive layer 50 are the first surface 21 b and the surfaces of other structures in the box 10 , the thickness of the first adhesive layer 50 is The straight-line distance between a surface 21b and the surfaces of other structures of the box 10 opposite to it. FIG.
  • the thickness of the first glue layer 50 is the linear distance between the first surface 21b and the surface of the water-cooling plate facing the battery pack 20b.
  • the thickness M of the first glue layer 50 may be 0.2mm, 0.3mm, 0.5mm, 1mm, 2mm, 3mm, 4mm, 5mm, etc.
  • the volume of the first glue layer 50 is smaller, thereby reducing the size of the first glue layer.
  • the layer 50 occupies the accommodating space 11 of the box 10 , thereby leaving more space for the accommodating space 11 to accommodate the battery cells 20 , which is beneficial to improving the energy density of the battery 100 .
  • the thickness M of the first adhesive layer 50 can be 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm, 1.5mm, 2.5mm, 2.8mm, etc.
  • the connection strength of the first adhesive layer 50 is better, ensuring a better connection strength between the battery pack 20b and the box 10, making the first adhesive layer 50 smaller in size , thereby reducing the occupation of the accommodating space 11 of the box 10 by the first glue layer 50, thereby leaving more space for the accommodating space 11 to accommodate the battery cells 20, which is beneficial to improving the energy density of the battery 100.
  • 0.5mm ⁇ M ⁇ 3mm can also enable the first adhesive layer 50 to have a certain buffering performance between the battery pack 20b and the box 10, thereby reducing the risk of the battery cell 20 being damaged by impact.
  • the weight of the first glue layer 50 is W 1 and the weight of the battery 100 is W 2 , which satisfies: 0.0001 ⁇ W 1 /W 2 ⁇ 0.001.
  • the weight W 2 of the battery 100 refers to the weight of the entire battery 100 , which is the sum of the weights of the first adhesive layer 50 , all battery cells 20 , the box 10 and other structures in the box 10 .
  • W 1 /W 2 refers to the proportion of the weight of the first adhesive layer 50 in the weight of the entire battery 100 .
  • W 1 /W 2 can be 0.0002, 0.0003, 0.0004, 0.0005, 0.0006, 0.0007, 0.0008, 0.0009, etc.
  • the specific gravity is smaller, thereby reducing the occupation of the accommodation space 11 of the box 10 by the first glue layer 50, thereby leaving more space for the accommodation space 11 to accommodate the battery cells 20, which is beneficial to improving the energy density of the battery 100.
  • the weight of the first glue layer 50 is W 1
  • the sum of the weights of the plurality of battery cells 20 is W 3 , which satisfies: 0.0004 ⁇ W 1 /W 3 ⁇ 0.002.
  • W 1 /W 3 refers to the ratio of the weight of the first adhesive layer 50 to the sum of the weights of all battery cells 20 .
  • W 1 /W 3 can be 0.0005, 0.0006, 0.0007, 0.0008, 0.0009, 0.001, 0.0013, 0.0015, 0.0017, 0.002, etc.
  • the first glue layer 50 occupies the accommodating space 11 of the box 10 , thereby leaving more space for the accommodating space 11 to accommodate the battery cells 20 , which is beneficial to improving the energy density of the battery 100 .
  • the battery 100 further includes a support 70;
  • the battery cell 20 includes a housing 21 and an electrode terminal 23, and the housing 21 includes a first wall 213 for mounting the electrode terminal 23,
  • the box body 10 includes a second wall 14 opposite to the first wall 213, and the support member 70 is supported between the first wall 213 and the second wall 14.
  • the first wall 213 of the housing 21 is the end cover 212 of the housing 21
  • the end cover 212 that can be supported by the support member 70 is the end cover 212 that is not blocked by other battery cells 20
  • the second wall 14 of the box 10 is the wall opposite to the end cap 212 that is not blocked by other battery cells 20 . Since the surface of the end cap 212 facing away from the interior of the battery cell 20 is not bonded by the first glue layer 50 , the support member 70 supported on the end cap 212 can avoid interference with the first glue layer 50 and facilitate the installation of the first glue layer 50 .
  • the second wall 14 is part of the wall of the first part 12 (shown in Figure 2) or the second part 13 (shown in Figure 2) of the box 10.
  • the support member 70 is supported between the first wall 213 of the battery cell 20 and the second wall 14 of the box 10 , which can improve the stability of the battery cell 20 being installed in the box 10 .
  • the support 70 includes a first support portion, a second support portion, and a first connection portion.
  • the first connection portion is attached to the second wall 14.
  • the first connection portion The supporting part and the second supporting part are connected to the first connecting part at intervals.
  • One end of the first supporting part facing away from the first connecting part and one end of the second supporting part facing away from the first connecting part are respectively connected to the two adjacent battery cells 20
  • the first wall 213 is attached.
  • the first connection part is attached to the second wall 14.
  • the first connection part and the second wall 14 may be connected, such as by bonding, welding, etc.; the first connection part and the second wall 14 may also be only in contact. touch.
  • the first supporting part and the second supporting part are connected to the first connecting part at intervals along the preset direction, then one end of the first supporting part facing away from the first connecting part and one end of the second supporting part facing away from the first connecting part are respectively connected to the first connecting part along the preset direction.
  • the first walls 213 of two battery cells 20 adjacent in the direction are attached.
  • the first support part is attached to the first wall 213.
  • the first support part and the first wall 213 may be connected, such as by bonding, welding, etc.; the first support part may also be only in contact with the first wall 213. touch.
  • the second support part is attached to the first wall 213.
  • the second support part and the first wall 213 may be connected, such as by bonding, welding, etc.; the second support part may also be only in contact with the first wall 213. touch.
  • At least one of the first supporting part, the second supporting part and the first connecting part may be a hollow structure or a solid structure.
  • FIG. 14 shows that the first support part and the second support part are hollow structures and the first connecting part is a solid structure, which can make the weight of the support member 70 smaller, thereby reducing the impact of the support member 70 on the overall weight of the battery 100 Impact.
  • the support 70 can be attached to the first walls 213 of two adjacent battery cells 20 to improve the connection stability of the two adjacent battery cells 20 in the box 10 . Moreover, one support member 70 can support two adjacent battery cells 20 , and fewer support members 70 can be used to support multiple battery cells 20 , thereby reducing the impact of the arrangement of the support members 70 on the energy density of the battery 100 .
  • the first walls 213 of two adjacent battery cells 20 are respectively supported by two independent supporting members 70 .
  • the battery 100 further includes a second glue layer 80 through which the support 70 and the first wall 213 are connected.
  • the support member 70 includes a first support part, a second support part and a first connection part
  • an end of the first support part facing away from the first connection part is connected to the first wall 213 through the second glue layer 80
  • the first One end of the support part facing away from the first connection part is connected to the first wall 213 through the second glue layer 80 .
  • the second glue layer 80 may be formed by coating.
  • the support member 70 and the first wall 213 are connected.
  • the second glue layer 80 may be a solid adhesive tape.
  • the support member 70 and the first wall 213 are connected through the second glue layer 80, which can maintain a stable support relationship between the support member 70 and the first wall 213, improve the ability of vibration, impact and other external forces, thereby reducing the impact of the support member 70 on the battery. Risk of monolithic 20 support failure.
  • An embodiment of the present application also provides an electrical device.
  • the electrical device includes the battery 100 provided in any of the above embodiments.
  • the embodiment of the present application provides a battery 100.
  • the battery 100 includes a box 10 and a plurality of square-shell batteries 100.
  • the plurality of square boxes are arranged to form a battery pack 20b and are accommodated in the accommodation space 11 of the box 10.
  • the volume of the accommodation space 11 is V
  • the number of square case batteries 100 is n
  • the volume of the square case batteries 100 is V 1
  • 35% ⁇ nV 1 /V ⁇ 95% is satisfied.
  • the first surface 21b of the battery pack 20b and the box 10 are bonded through the first glue layer 50.
  • the battery 100 also includes a support member 70.
  • the support member 70 includes a first support part, a second support part and a first connection part.
  • the first The support part and the second support part are connected to the first connection part at intervals along the preset direction.
  • the first connection part is connected to the first wall 213 of the box 10 .
  • One end of the first support part away from the first connection part passes through the second glue layer.
  • 80 is bonded to the end cover 212 of one of the two square-shell batteries 100 adjacent in the preset direction, and the end of the second support part away from the first connection part is bonded to the edge through the second glue layer 80

Abstract

La présente demande se rapporte au domaine technique des batteries, et concerne une batterie et un dispositif électrique. La batterie comprend un corps de boîtier et une pluralité d'éléments de batterie ; un espace de réception est formé dans le corps de boîtier ; la pluralité d'éléments de batterie est logée dans l'espace de réception ; et le volume de l'espace de réception équivaut à V, le nombre des éléments de batterie équivaut à n, et le volume de chaque élément de batterie équivaut à V1, et l'expression relationnelle suivante est satisfaite : 35 % ≤ nV1/V ≤ 95 %, de sorte qu'il soit garanti que la somme des volumes de tous les éléments de batterie occupe 35 % à 95 % du volume de l'espace de réception. Ainsi, l'espace interne du corps de boîtier est complètement exploité, ce qui permet d'augmenter la densité d'énergie de la batterie. De plus, les éléments de batterie n'occupent pas complètement l'espace de réception. Par conséquent, un espace suffisant est prévu pour que les éléments de batterie soient installés et fixés dans le corps de boîtier et pour que les éléments de batterie dissipent la chaleur, assurant ainsi la fiabilité et la sécurité de la structure globale de la batterie.
PCT/CN2022/103099 2022-06-30 2022-06-30 Batterie et dispositif électrique WO2024000502A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/CN2022/103099 WO2024000502A1 (fr) 2022-06-30 2022-06-30 Batterie et dispositif électrique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2022/103099 WO2024000502A1 (fr) 2022-06-30 2022-06-30 Batterie et dispositif électrique

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110165113A (zh) * 2019-01-09 2019-08-23 比亚迪股份有限公司 动力电池包及电动车
CN110190218A (zh) * 2019-05-07 2019-08-30 宁德时代新能源科技股份有限公司 电池包和车辆
US20190288254A1 (en) * 2018-03-15 2019-09-19 Nio Usa, Inc. Unified battery module with integrated battery cell structural support
CN112310525A (zh) * 2019-08-14 2021-02-02 宁德时代新能源科技股份有限公司 电池箱
CN113675456A (zh) * 2021-08-20 2021-11-19 夏秀明 一种动力型锂离子电池单体、动力电池包和电动车
CN215644798U (zh) * 2021-09-16 2022-01-25 远景能源有限公司 电池包和储能电池

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20190288254A1 (en) * 2018-03-15 2019-09-19 Nio Usa, Inc. Unified battery module with integrated battery cell structural support
CN110165113A (zh) * 2019-01-09 2019-08-23 比亚迪股份有限公司 动力电池包及电动车
CN110190218A (zh) * 2019-05-07 2019-08-30 宁德时代新能源科技股份有限公司 电池包和车辆
CN112310525A (zh) * 2019-08-14 2021-02-02 宁德时代新能源科技股份有限公司 电池箱
CN113675456A (zh) * 2021-08-20 2021-11-19 夏秀明 一种动力型锂离子电池单体、动力电池包和电动车
CN215644798U (zh) * 2021-09-16 2022-01-25 远景能源有限公司 电池包和储能电池

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