WO2024255630A1 - Plaque d'extrémité, boîtier la comprenant et batterie de grande capacité - Google Patents

Plaque d'extrémité, boîtier la comprenant et batterie de grande capacité Download PDF

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Publication number
WO2024255630A1
WO2024255630A1 PCT/CN2024/096990 CN2024096990W WO2024255630A1 WO 2024255630 A1 WO2024255630 A1 WO 2024255630A1 CN 2024096990 W CN2024096990 W CN 2024096990W WO 2024255630 A1 WO2024255630 A1 WO 2024255630A1
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WO
WIPO (PCT)
Prior art keywords
end plate
sub
chamber
gas
capacity battery
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
PCT/CN2024/096990
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English (en)
Chinese (zh)
Inventor
雷政军
陈孟奇
张三学
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D Aus Energy Storage Technology Xian Co Ltd
Original Assignee
D Aus Energy Storage Technology Xian Co Ltd
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Filing date
Publication date
Application filed by D Aus Energy Storage Technology Xian Co Ltd filed Critical D Aus Energy Storage Technology Xian Co Ltd
Publication of WO2024255630A1 publication Critical patent/WO2024255630A1/fr
Anticipated expiration legal-status Critical
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/244—Secondary casings; Racks; Suspension devices; Carrying devices; Holders characterised by their mounting method
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/233—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions
    • H01M50/242—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions adapted for protecting batteries against vibrations, collision impact or swelling
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/30—Arrangements for facilitating escape of gases
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/60—Arrangements or processes for filling or topping-up with liquids; Arrangements or processes for draining liquids from casings
    • H01M50/609—Arrangements or processes for filling with liquid, e.g. electrolytes
    • H01M50/627—Filling ports
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present application relates to the field of batteries, and in particular to an end plate, a housing having the end plate, and a large-capacity battery.
  • the related technology proposes a large-capacity battery, as shown in Figures 1 and 2, the large-capacity battery includes a shell and a plurality of single cells; the plurality of single cells are placed in parallel in the shell, and a third through hole is provided on the top plate of the shell corresponding to the pole of each single cell for the pole of the single cell to extend out of the shell; each single cell pole extends out of the third through hole and the shell area corresponding to the third through hole is fixedly sealed with the single cell shell.
  • the bottom plate of the outer shell is provided with an electrolyte sharing chamber (the electrolyte sharing chamber is located inside the outer shell in FIG2 ), and the electrolyte sharing chamber is connected to the electrolyte area in the inner cavity of each single cell.
  • the electrolyte sharing chamber Through the electrolyte sharing chamber, each single cell can be placed in a unified electrolyte environment, thereby ensuring the uniformity of the electrolyte in each single cell and improving the performance and cycle life of large-capacity batteries.
  • the top plate of the shell is provided with a gas chamber, which can be connected to the gas area of the inner cavity of each single cell to achieve gas balance of each single cell, further improving the performance and cycle life of large-capacity batteries.
  • the gas chamber can also serve as an explosion relief channel. When any single cell has thermal runaway, the thermal runaway smoke in the inner cavity of the single cell enters the gas chamber and breaks through the explosion relief mechanism set at either end of the gas chamber and is discharged.
  • the sealing of the shell is particularly important.
  • the shell is composed of a cylinder and end plates sealed and welded at both ends.
  • a through hole is provided in the area corresponding to the end plate and the gas chamber, and the explosion relief mechanism is sealed and welded to the end plate area around the through hole.
  • the size of the gas chamber arranged in the middle of the top plate is limited in the y direction, which leads to the insufficient size of the area of the end plate facing the gas chamber in the y direction, making it difficult to install the explosion relief mechanism.
  • the purpose of the present application is to provide an end plate, a housing having the end plate, and a large-capacity battery, so as to overcome the problem that it is difficult to install an explosion relief mechanism in the end plate area directly opposite to the gas chamber port of the existing large-capacity battery.
  • An end plate which is special in that it comprises an end plate body, and the end plate body is used to seal the open end of the gas chamber, the open end of the electrolyte sharing chamber and the open end of the cylinder of the large-capacity battery;
  • the end plate body is provided with a gas passage, and the end plate body is provided with a first through hole;
  • the gas inlet end of the gas channel is used to communicate with the gas chamber of the large-capacity battery, and the gas outlet end is communicated with the first through hole; the first through hole is used to communicate with the explosion relief mechanism of the large-capacity battery.
  • the explosion relief mechanism can be used as a part of the end plate body, and the first through hole is used to communicate with the large-capacity battery electrolyte sharing chamber;
  • the explosion relief mechanism is connected to the first through hole and is sealed to the end plate body area around the first through hole.
  • the end plate body comprises a first sub-end plate, a second sub-end plate and a third sub-end plate;
  • the first sub-end plate is used to seal the open end of the gas chamber of the large-capacity battery
  • the second sub-end plate is used to seal the open end of the electrolyte sharing chamber of the large-capacity battery
  • the third sub-end plate is located between the first sub-end plate and the second sub-end plate and connected to the first sub-end plate and the second sub-end plate, and the third sub-end plate is used to seal the open end of the large-capacity battery cylinder.
  • the gas channel is a groove formed on the inner surface of the third sub-end plate.
  • the gas channel can also be constructed by adding two fourth sub-end plates, the two fourth sub-end plates are fixed to the inner surface of the third sub-end plate, and there is a gap between the two fourth sub-end plates, and the above gap serves as the gas channel.
  • it also includes a fifth sub-end plate, which is fixed to the inner surfaces of the two fourth sub-end plates.
  • the present application also provides an end plate with a different structure from the above, wherein the end plate body includes a first sub-end plate and a sixth sub-end plate;
  • the first sub-end plate is used to seal the open end of the gas chamber of the large-capacity battery
  • the sixth sub-end plate is used to simultaneously seal the open end of the electrolyte sharing chamber of the large-capacity battery and the open end of the large-capacity battery cylinder.
  • the gas channel is a groove formed on the inner surface of the sixth sub-end plate.
  • the gas channel can be constructed by adding two fourth sub-end plates; the two fourth sub-end plates are fixed to the inner surface of the sixth sub-end plate, and there is a gap between the two fourth sub-end plates, and the above gap serves as the gas channel.
  • it also includes a fifth sub-end plate, which is fixed to the inner surfaces of the two fourth sub-end plates.
  • the present application also provides a shell, which is special in that it includes a cylinder and a first end plate and a second end plate respectively sealed and fixed to two opposite open ends of the cylinder, and at least one of the first end plate and the second end plate is any of the end plates described above.
  • the present application also provides a large-capacity battery, which is special in that it includes a shell and a plurality of single cells connected in parallel and arranged in the shell, wherein the shell is the above-mentioned shell.
  • the present application overcomes the problem of the difficulty in installing the explosion relief mechanism by adjusting the explosion relief mechanism from the end plate area directly opposite the open end of the gas chamber to the open end of the electrolyte shared chamber with a larger area or the end plate area between the open end of the gas chamber and the open end of the electrolyte shared chamber.
  • the first through hole is sealed by the explosion relief mechanism; the air inlet of the gas channel is connected to the gas chamber, and the air outlet of the gas channel is connected to the explosion relief mechanism through the first through hole.
  • the first through hole of the present application is connected with the shared chamber of the large-capacity battery electrolyte.
  • the first through hole also serves as the operating port of the package opening device and can also be used as the liquid injection port.
  • the operating port of the package opening device or the liquid injection port on the end plate the overall structural strength of the end plate is higher, the structure is simple, and it is easy to process.
  • the gas channel of the present application can be a groove directly opened on the end plate, or two gas channels can be used.
  • the four-sub-end plate is constructed, and the size of the fourth sub-end plate along the x-direction can be adjusted to clamp all the single cells in the x-direction, thereby improving the stability of each single cell in the inner cavity of the shell, and preventing each single cell from swelling, which would lead to a decrease in the cycle performance of the large-capacity battery.
  • the present application may also introduce a fifth sub-end plate.
  • the fifth sub-end plate By adding the fifth sub-end plate, on the one hand, the dimensional error of the two fourth sub-end plates in the x direction can be compensated, and the flatness of the entire end plate in the yz plane can be improved; on the other hand, by adjusting the size of the fifth sub-end plate along the x direction, all single cells can be clamped in the x direction, thereby improving the stability of each single cell in the inner cavity of the outer shell, and preventing each single cell from swelling, which may lead to the problem of reduced cycle performance of large-capacity batteries; on the third hand, the fifth end plate can be used to isolate the outermost single cell from direct contact with the thermal runaway flue gas in the gas channel, thereby avoiding the influence of the thermal runaway flue gas on the outermost single cell; on the fourth hand, compared with the structural form of the groove, the gas channel is relatively closed, which can reduce the possibility of thermal runaway flue gas diffusing in the outer
  • FIG1 is a schematic diagram of a large-capacity battery structure in the background art
  • FIG2 is a schematic diagram of another large-capacity battery structure in the background art
  • FIG3 is a schematic diagram of a cylindrical structure of a large-capacity battery in Example 1;
  • FIG4 is a schematic diagram of an electrolyte sharing chamber structure of a large-capacity battery in Example 1;
  • FIG5 is a schematic diagram of a gas chamber structure of a large-capacity battery in Example 1;
  • FIG6 is a schematic diagram of the structure of a large-capacity battery in Example 1;
  • FIG7 is a schematic diagram of the end plate structure in Example 1.
  • FIG8 is a schematic structural diagram of the end plate in Embodiment 1 from another perspective;
  • FIG9 is a schematic diagram of the structure of an end plate with a stepped surface in Example 1;
  • FIG10 is a schematic diagram of the structure of the heat transfer connector in Example 1.
  • FIG11 is a schematic diagram of the explosion structure of the end plate in Example 2.
  • FIG12 is a schematic diagram of the end plate structure in Example 2.
  • Example 13 is a schematic diagram of the exploded structure of the rear end plate after the fifth sub-end plate is added in Example 2;
  • FIG. 14 is a schematic structural diagram of a rear end plate after adding a fifth sub-end plate in Embodiment 2;
  • FIG15 is a schematic diagram of the cylindrical structure of a large-capacity battery in Example 3.
  • FIG16 is a schematic diagram of the structure of a large-capacity battery in Example 3.
  • FIG17 is a schematic diagram of the structure of the end plate in Example 3.
  • FIG18 is a schematic diagram of a housing structure in Example 4.
  • Electrolyte shared chamber 01. Gas chamber; 03. End plate; 04. Explosion relief mechanism;
  • orientation or positional relationship indicated by the terms “top, bottom” etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing this application and simplifying the description, rather than indicating or implying 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 of this application.
  • first, second, third, fourth, etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.
  • the present application provides an end plate suitable for a large-capacity battery, which includes a housing and a plurality of single cells arranged in parallel in the housing; the single cells described herein may be square-shell batteries or multiple commercially available soft-pack batteries connected in parallel.
  • the inner cavity of each single cell includes an electrolyte region and a gas region.
  • An electrolyte sharing chamber is arranged at the bottom of the shell, and the electrolyte sharing chamber is communicated with the electrolyte area of the inner cavity of each single battery.
  • a gas chamber is provided on the top of the shell, and the gas chamber covers the gas port on the top of each single cell in the large-capacity battery. It should be noted that the gas port here includes the following two meanings:
  • the gas port is a through hole directly opened on the upper cover plate of the single cell and penetrating the inner cavity of the single cell;
  • the inner cavity of the gas chamber is connected with the gas area of the inner cavity of each single cell through the gas port.
  • the gas chamber serves as a gas sharing chamber for each single cell. Based on the gas chamber, the gas areas of each single cell can be connected to achieve gas balance, so that the gas of each single cell is shared to ensure the consistency of each single cell, which improves the cycle life of the large-capacity battery to a certain extent; when any single cell has thermal runaway, the smoke in the inner cavity of the single cell enters the gas chamber and is discharged through the gas chamber, thereby improving the safety of the large-capacity battery.
  • the gas port is an explosion vent or explosion-proof port provided on the upper cover plate of the single cell, and an explosion vent membrane is provided at the explosion vent or explosion-proof port;
  • the gas chamber is used as an explosion-proof passage.
  • the explosion-proof membrane at the gas port of any single battery is broken by the inner cavity smoke, the inner cavity smoke of the single battery is discharged through the gas chamber, thereby improving the safety of the large-capacity battery.
  • the structure of the above shell is as follows, taking a rectangular shell as an example:
  • the housing comprises a U-shaped shell, a second cover plate, a first end plate and a second end plate;
  • the U-shaped shell refers to a shell having a U-shaped cross section, that is, a shell having three continuous open ends.
  • the electrolyte sharing chamber is arranged at the bottom of the U-shaped shell, and the gas chamber is arranged on the second cover plate.
  • the above-mentioned electrolyte sharing chamber is an electrolyte containing chamber, which, after being connected to the electrolyte area of each single cell inner cavity, needs to ensure that the electrolyte in the entire large-capacity battery does not contact the external environment.
  • the electrolyte in the large-capacity battery can be prevented from contacting the external environment.
  • the second cover plate and the U-shaped shell can be arranged separately or as an integrated structure.
  • At least one of the first end plate and the second end plate is the end plate described in the present application.
  • the length direction of the shell is defined as the x direction
  • the width direction of the shell is defined as the y direction
  • the height direction of the shell is defined as the z direction, as shown in FIG. 3 .
  • the end plate of this embodiment is suitable for a large-capacity battery having the following electrolyte shared chamber 2 structure:
  • a first channel is formed at the bottom 1 of the U-shaped shell as the electrolyte sharing chamber 2 , and the bottom 1 of the U-shaped shell is convexed in a direction away from the top of the U-shaped shell.
  • the second structure is a square or circular tube section fixed on the outer surface of the bottom 1 of the U-shaped shell; through holes are opened in the tube wall and the bottom 1 of the U-shaped shell; the electrolyte sharing chamber 2 is connected with the electrolyte area of the inner cavity of each single battery through the through hole.
  • the two ends of the electrolyte shared chamber 2 in the above two structures located in the yz plane are open ends.
  • the gas chamber 4 of the large-capacity battery can adopt the following structural forms:
  • a second channel extending along the x direction is provided on the second cover plate 3 ; the second channel can be directly formed on the second cover plate 3 by a bending or aluminum extrusion process, wherein the second channel protrudes in a direction away from the bottom 1 of the U-shaped shell.
  • a pipe section with a square or circular cross section is fixed on the outer surface of the top of the second cover plate 3 ; through holes are opened in the pipe wall and the second cover plate 3 .
  • the two ends of the gas chamber 4 in the above two structures located on the yz plane are open ends.
  • the end plate structure of this embodiment includes an end plate body 5 , which is fixed to the open end of a cylinder 6 formed by a U-shaped shell and a second cover plate, sealing the open end of the cylinder 6 while sealing the open ends of the gas chamber 4 and the electrolyte shared chamber 2 .
  • the end plate body 5 is divided into three areas according to different sealing objects, and the three areas are defined as a first sub-end plate 51, a second sub-end plate 52 and a third sub-end plate 53, as shown in FIG. 7 .
  • the first sub-end plate is used to seal the open end of the gas chamber 4 of the large-capacity battery.
  • the shape of the first sub-end plate is adapted to the shape of the open end of the gas chamber 4.
  • the area of the first sub-end plate can be slightly larger than the area of the open end of the gas chamber 4, and it is fixed to the open end of the gas chamber 4 by fusion welding; the area of the first sub-end plate can also be slightly smaller than the area of the open end of the gas chamber 4, and it is fixed to the open end of the gas chamber 4 by embedding welding.
  • the second sub-end plate is used to seal the open end of the electrolyte shared chamber 2 of the large-capacity battery.
  • the shape of the second sub-end plate is adapted to the shape of the open end of the electrolyte shared chamber 2, and the area can be slightly larger than the battery.
  • the open end area of the electrolyte shared chamber 2 is fixed to the open end of the electrolyte shared chamber 2 by fusion welding; the area can also be slightly smaller than the open end area of the electrolyte shared chamber 2 and fixed to the open end of the electrolyte shared chamber 2 by embedding welding.
  • the third sub-end plate is used to seal the open end of the cylinder 6 of the large-capacity battery.
  • the shape of the third sub-end plate is adapted to the shape of the open end of the cylinder 6.
  • the area of the third sub-end plate can be slightly larger than the area of the open end of the cylinder 6, and it is fixed to the open end of the cylinder 6 by fusion welding; the area of the third sub-end plate can also be slightly smaller than the area of the open end of the cylinder 6, and it is fixed to the open end of the cylinder 6 by embedding welding.
  • the first sub-end plate 51, the second sub-end plate 52 and the third sub-end plate 53 are an integral part.
  • a split structure may be adopted.
  • its processing procedure is more complicated.
  • each connection part is a weak part or a leak-prone point, which leads to weak sealing of the entire outer shell.
  • the explosion relief mechanism 7 As described in the background technology, if the explosion relief mechanism 7 is fixed to the open end of the gas chamber 4, it is necessary to open a through hole that passes through the inner cavity of the gas chamber 4 in the first sub-end plate 51, and weld the explosion relief mechanism 7 to the area of the first sub-end plate 51 around the through hole. Since the first sub-end plate 51 is insufficiently sized in the y direction, the explosion relief mechanism is difficult to install.
  • the present embodiment opens a first through hole 9 in the end plate area corresponding to the second sub-end plate 52 or the open end of the electrolyte shared chamber 2.
  • the first through hole 9 is located on a part of the second sub-end plate 52 and the third sub-end plate 53, and the explosion relief mechanism 7 is welded to a part of the second sub-end plate 52 and the third sub-end plate 53 around the first through hole 9 (see FIG. 6); at the same time, a gas channel 10 is added to the end plate to connect the gas chamber 4 and the electrolyte shared chamber 2.
  • a hollow component with an explosion relief membrane at one end can be used as the explosion relief mechanism 7.
  • the explosion relief mechanism 7 is fixed on partial areas of the second sub-end plate 52 and the third sub-end plate 53, in the y direction, the sizes of the second sub-end plate 52 and the third sub-end plate 53 are much larger than the first sub-end plate 51, and there is enough installation position for the explosion relief mechanism 7.
  • the first through hole 9 When the first through hole is located in the end plate area corresponding to the open end of the electrolyte shared chamber 2, the first through hole 9 also serves as an operating port of the unpacking device, and the unpacking device extends into the electrolyte shared chamber 2 through the first through hole 9 to unpack each single battery, so that the electrolyte shared chamber 2 and the inner cavity of each single battery are electrically connected.
  • the first through hole 9 can also be used as a liquid injection port.
  • the explosion relief mechanism 7 is sealed and welded to the second sub-end plate 52 and the third sub-end plate 53 around the first through hole 9.
  • the operating port or the liquid injection port of the package opening device respectively opened on the end plate the overall structural strength of the end plate is higher, and the structure is simple, which is easy to process.
  • this embodiment uses milling or turning methods to directly open a groove on the inner surface 531 of the third sub-end plate as a gas channel 10.
  • the gas channel 10 of this embodiment extends from the top of the third sub-end plate 53 along the z direction to the first through hole 9, and is connected to the first through hole 9.
  • the upper port of the gas channel 10 serves as an air inlet and is connected to the gas chamber 4.
  • the lower port of the gas channel 10 serves as an air outlet and is connected to the first through hole 9.
  • the size of the third sub-end plate 53 is larger than that of the first sub-end plate 51 , so that the gas channel 10 is directly connected to the gas chamber 4 .
  • the area of the first sub-end plate 51 is slightly smaller than the area of the open end of the gas chamber 4, and it is fixed to the open end of the gas chamber 4 by means of embedding welding.
  • the area of the third sub-end plate 53 is slightly smaller than the area of the open end of the cylinder 6, and it is fixed to the open end of the cylinder 6 by means of embedding welding.
  • the area of the second sub-end plate 52 is slightly smaller than the area of the open end of the electrolyte shared chamber 2, and it is fixed to the open end of the electrolyte shared chamber 2 by means of embedding welding.
  • the end plate can also be fixed by fusion welding by setting a step surface 12 around the third end plate.
  • the step surface 12 can also be used as a positioning surface.
  • the end plate can be first positioned at the open end of the cylinder 6 by using the positioning surface, and then fixed by fusion welding, as shown in Figure 9.
  • the area of the first sub-end plate 51 is slightly larger than the open end area of the gas chamber 4, and it is fixed to the open end of the gas chamber 4 by fusion welding.
  • the area of the outer surface of the third sub-end plate 53 is slightly larger than the open end area of the cylinder 6, and the area of the inner surface 531 of the third sub-end plate is slightly smaller than the open end area of the cylinder 6. It is fixed to the open end of the cylinder 6 by fusion welding.
  • the area of the second sub-end plate 52 is slightly larger than the open end area of the electrolyte shared chamber 2, and it is fixed to the open end of the electrolyte shared chamber 2 by fusion welding.
  • the first sub-end plate 51, the second sub-end plate 52 and the third sub-end plate 53 have equal sizes in the x direction.
  • a blind hole can be opened in the first sub-end plate to serve as an air inlet of the gas channel 10.
  • the size of the gas chamber 4 of this embodiment is smaller than that of the gas chamber 4 shown in FIG. 1 .
  • the area of the second cover plate 3 located on both sides of the gas chamber 4 can be increased. In this area, the temperature of the entire large-capacity battery can be adjusted by adding heat transfer connectors 8 or pole adapters connected to each single cell pole.
  • the heat transfer connector 8 can adopt the structure shown in FIG. 10, which is a slender member used to connect to the positive or negative pole of each single battery; and a clamping portion for installing a heat transfer tube is provided on the slender member along the axial direction.
  • the pole adapter may be an electrical busbar disclosed in Chinese patent CN116130892A.
  • this embodiment adopts a gas channel 10 with a different structural form.
  • two fourth sub-end plates 54 are further included on the basis of Example 1, as shown in Figures 11 and 12; the two fourth sub-end plates 54 are fixed to the inner surface 531 of the third sub-end plate, and there is a gap extending along the z direction between the two fourth sub-end plates 54, and the gap is used as the gas channel 10.
  • the fourth sub-end plate 54 When the fourth sub-end plate 54 is larger in size along the z direction, fixing it on the third sub-end plate 53 may block the first through hole 9, resulting in the gas channel 10 or the electrolyte shared chamber 2 being unable to communicate with the explosion relief mechanism 7.
  • a second through hole 11 or a gap that penetrates the first through hole 9 is opened on the two fourth sub-end plates 54 to ensure that the explosion relief mechanism 7 is connected to the electrolyte shared chamber 2 or the gas channel 10.
  • the first sub-end plate can be fixed to the open end of the gas chamber 4 by means of inlay welding and fusion welding
  • the second sub-end plate can be fixed to the open end of the electrolyte sharing chamber 2
  • the third sub-end plate can be fixed to the open end of the cylinder 6.
  • FIG12 shows a structure corresponding to the fusion welding method, that is, after the fourth sub-end plate 54 is fixed to the third sub-end plate 53, a step surface 12 is formed around the third sub-end plate 53.
  • the fourth sub-end plate 54 may be fixed to the third sub-end plate 53 by means of screws, or the two may be fixed by means of bonding or welding.
  • this embodiment can also compensate for the dimensional error of the two fourth sub-end plates 54 in the x direction by adding a fifth sub-end plate 55, thereby improving the flatness of the entire end plate in the yz plane.
  • this embodiment can also compensate for the dimensional error of the two fourth sub-end plates 54 in the x direction by adding a fifth sub-end plate 55, thereby improving the flatness of the entire end plate in the yz plane.
  • this embodiment can also compensate for the dimensional error of the two fourth sub-end plates 54 in the x direction by adding a fifth sub-end plate 55, thereby improving the flatness of the entire end plate in the yz plane.
  • the size of the fifth sub-end plate 55 along the x direction all the single cells can be clamped in the x direction to improve the stability of each single cell in the inner cavity of the shell, and the problem of reducing the cycle performance of large-capacity batteries due to swelling of each single cell can be prevented.
  • the fifth end plate can be used to isolate the outermost single cell from direct contact with the thermal runaway flue gas in the gas channel 10, thereby avoiding the influence of the thermal runaway flue gas on the outermost single cell.
  • the gas channel is relatively closed, which can reduce the possibility of the thermal runaway flue gas diffusing in the shell, and has a better thermal runaway flue gas emission effect.
  • the end plate of the present embodiment is suitable for a large-capacity battery having the following electrolyte sharing chamber 2 structure:
  • At least two support ribs 13 extending along the x direction are provided on the inner surface of the U-shaped shell bottom 1, and the two support ribs 13 and the area of the U-shaped shell bottom 1 located between the two support ribs 13 constitute an electrolyte shared chamber 2.
  • the two ends of the electrolyte shared chamber 2 located in the yz plane are open ends.
  • the end plate structure of this embodiment includes an end plate body 5, which is fixed to the open end of the cylinder 6 composed of a U-shaped shell and a second cover plate, sealing the open end of the cylinder 6 while sealing the open ends of the gas chamber 4 and the electrolyte shared chamber 2.
  • the end plate body 5 is divided into two areas according to different sealing objects, and the two areas are respectively defined as a first sub-end plate 51 and a sixth sub-end plate 56, as shown in FIG. 17 .
  • the first sub-end plate is used to seal the open end of the gas chamber 4 of the large-capacity battery.
  • the shape of the first sub-end plate is adapted to the shape of the open end of the gas chamber 4, and the area can be slightly larger than the open end of the gas chamber 4.
  • the end area is fixed to the open end of the gas chamber 4 by fusion welding; the area can also be slightly smaller than the open end area of the gas chamber 4 and fixed to the open end of the gas chamber 4 by embedding welding.
  • the sixth sub-end plate 56 is used to simultaneously seal the open end of the large-capacity battery cylinder 6 and the open end of the electrolyte shared chamber 2; because the electrolyte shared chamber 2 in this embodiment is located in the cylinder 6, when the sixth sub-end plate 56 is sealed and fixed to the open end of the cylinder 6 of the large-capacity battery, the open end of the electrolyte shared chamber 2 can be sealed at the same time.
  • the shape of the sixth sub-end plate 56 is adapted to the shape of the open end of the cylinder 6, and the area can be slightly larger than the area of the open end of the cylinder 6, and it is fixed to the open end of the cylinder 6 by fusion welding; the area can also be slightly smaller than the area of the open end of the cylinder 6, and it is fixed to the open end of the cylinder 6 by embedding welding.
  • the first sub-end plate 51 and the sixth sub-end plate 56 are an integral part.
  • a split structure may be adopted.
  • its processing procedure is more complicated.
  • each connection part is a weak part or a leak-prone point, which leads to weak sealing of the entire outer shell.
  • a first through hole 9 is opened on the sixth sub-end plate 56, and preferably, the first through hole 9 is opened in the area of the sixth sub-end plate 56 corresponding to the open end of the electrolyte shared chamber 2, and the explosion relief mechanism 7 is welded to a partial area of the sixth sub-end plate 56 around the first through hole 9; at the same time, a gas channel 10 is set on the first sub-end plate 51 and the sixth sub-end plate 56 to connect the gas chamber 4 and the electrolyte shared chamber 2.
  • the smoke in its inner cavity rushes out from the gas port, and will pass through the gas chamber 4 and the gas channel 10 in sequence, and rush open the explosion relief mechanism 7 to be discharged from the explosion relief mechanism 7.
  • the structure of the gas channel 10 is the same as that of Example 1 and Example 2, and can be directly opened on the sixth sub-end plate 56, or constructed by adding two fourth sub-end plates 54, and fixing the two fourth sub-end plates 54 on the inner surface of the sixth sub-end plate 56.
  • the fifth sub-end plate 55 can also be added to compensate for the dimensional error of the two fourth sub-end plates 54 in the x direction, and at the same time, it can also play a role in clamping the single cell and reducing the influence of thermal runaway smoke on the outermost single cell.
  • the size of the sixth sub-end plate 56 in the y direction is much larger than the first sub-end plate 51 , so there is enough installation position for the explosion relief mechanism 7 .
  • the heat exchange effect can be improved by reducing the size of the gas chamber 4y in the second embodiment; the first through hole 9 can also be used as an operating port of the package opening device and a liquid injection port.
  • the specific content has been described in detail in the first embodiment and will not be repeated here.
  • This embodiment is a housing, one structure of which is shown in FIG18, comprising the barrel 6 described in the above embodiment and the first end plate and the second end plate respectively sealed and fixed at the two opposite open ends of the barrel 6, wherein at least one of the first end plate and the second end plate is the end plate described in the above embodiment.
  • the other end plate can be a flat plate structure, which seals the open end of the barrel 6 while sealing the open end of the gas chamber 4 and the open end of the electrolyte shared chamber 2.
  • the specific structural form of the barrel 6 and the end plate and the fixing method of the barrel 6 and the end plate have been specifically described in the above embodiment, and will not be repeated here.
  • This embodiment is a large-capacity battery.
  • a plurality of single cells connected in parallel are arranged in the housing of Embodiment 4. The above embodiments have been described in detail and will not be repeated here.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Gas Exhaust Devices For Batteries (AREA)

Abstract

La présente demande concerne le domaine des batteries, et plus particulièrement une plaque d'extrémité, un boîtier la comprenant, et une batterie de grande capacité. La plaque d'extrémité comprend un corps de plaque d'extrémité ; le corps de plaque d'extrémité est utilisé pour fermer une extrémité ouverte d'une chambre à gaz, une extrémité ouverte d'une chambre de partage d'électrolyte et une extrémité ouverte d'un cylindre d'une batterie de grande capacité ; un canal de gaz est disposé sur le corps de plaque d'extrémité, et un premier trou traversant est formé dans le corps de plaque d'extrémité ; une extrémité d'entrée de gaz du canal de gaz est en communication avec la chambre à gaz de la batterie de grande capacité, et une extrémité de sortie de gaz du canal de gaz est en communication avec le premier trou traversant ; et le premier trou traversant est en communication avec un mécanisme de ventilation d'explosion de la batterie de grande capacité. Selon la présente demande, le mécanisme de ventilation d'explosion est ajusté à partir d'une région de plaque d'extrémité, qui fait directement face à l'extrémité ouverte de la chambre à gaz, à l'extrémité ouverte de la chambre de partage d'électrolyte ayant une grande surface ou à une région de plaque d'extrémité entre l'extrémité ouverte de la chambre à gaz et l'extrémité ouverte de la chambre de partage d'électrolyte, ce qui permet de résoudre le problème de la difficulté de montage du mécanisme de ventilation d'explosion.
PCT/CN2024/096990 2023-06-16 2024-06-03 Plaque d'extrémité, boîtier la comprenant et batterie de grande capacité Pending WO2024255630A1 (fr)

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CN202310713598.8 2023-06-16

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CN119092775A (zh) * 2023-06-06 2024-12-06 双澳储能科技（西安）有限公司 一种大容量电池的制备工艺
AU2024286794A1 (en) * 2023-06-06 2026-01-22 D-Aus Energy Storage Technology (Xi'an) Co., Ltd Large-capacity battery, cover plate, shell, cylinder assembly, cylinder, elastic supporting piece, bottom supporting piece and preparation process of large-capacity battery
CN117878492A (zh) * 2023-06-16 2024-04-12 陕西奥林波斯电力能源有限责任公司 一种大容量电池
WO2024255631A1 (fr) * 2023-06-16 2024-12-19 双澳储能科技（西安）有限公司 Batterie à haute capacité et ensembles de plaques d'extrémité
WO2025045051A1 (fr) * 2023-08-30 2025-03-06 双澳储能科技（西安）有限公司 Batterie à haute capacité et cartouche
WO2025167744A1 (fr) * 2024-02-05 2025-08-14 双澳储能科技（西安）有限公司 Système de sécurité incendie, système de sécurité incendie centralisé, dispositif de stockage d'énergie et système de stockage d'énergie

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CN216354447U (zh) * 2021-11-30 2022-04-19 蜂巢能源科技有限公司 电池壳体、电池以及电池模组
CN114388876A (zh) * 2021-12-31 2022-04-22 陕西奥林波斯电力能源有限责任公司 一种大容量电池结构
CN117673608A (zh) * 2023-06-16 2024-03-08 陕西奥林波斯电力能源有限责任公司 一种端板以及具有该端板的外壳及大容量电池
CN220585423U (zh) * 2023-06-16 2024-03-12 陕西奥林波斯电力能源有限责任公司 一种端板以及具有该端板的外壳及大容量电池

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JP2013026091A (ja) * 2011-07-24 2013-02-04 Toyota Industries Corp カバー付き角型二次電池セル
CN216354447U (zh) * 2021-11-30 2022-04-19 蜂巢能源科技有限公司 电池壳体、电池以及电池模组
CN114388876A (zh) * 2021-12-31 2022-04-22 陕西奥林波斯电力能源有限责任公司 一种大容量电池结构
CN117673608A (zh) * 2023-06-16 2024-03-08 陕西奥林波斯电力能源有限责任公司 一种端板以及具有该端板的外壳及大容量电池
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CN117878492A (zh) * 2023-06-16 2024-04-12 陕西奥林波斯电力能源有限责任公司 一种大容量电池

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