WO2024016308A1 - Ensemble couvercle d'extrémité pour élément de batterie, élément de batterie, batterie et dispositif électrique - Google Patents

Ensemble couvercle d'extrémité pour élément de batterie, élément de batterie, batterie et dispositif électrique Download PDF

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Publication number
WO2024016308A1
WO2024016308A1 PCT/CN2022/107305 CN2022107305W WO2024016308A1 WO 2024016308 A1 WO2024016308 A1 WO 2024016308A1 CN 2022107305 W CN2022107305 W CN 2022107305W WO 2024016308 A1 WO2024016308 A1 WO 2024016308A1
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WO
WIPO (PCT)
Prior art keywords
battery
end cap
end cover
hole
area
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Application number
PCT/CN2022/107305
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English (en)
Chinese (zh)
Inventor
周健
程启
周文林
李全坤
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 CN202280068051.0A priority Critical patent/CN118044059A/zh
Priority to PCT/CN2022/107305 priority patent/WO2024016308A1/fr
Publication of WO2024016308A1 publication Critical patent/WO2024016308A1/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
    • H01M50/30—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
    • H01M50/636—Closing or sealing filling ports, e.g. using lids
    • H01M50/645—Plugs
    • H01M50/655—Plugs specially adapted for venting
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present application relates to the field of battery technology, and in particular to an end cover assembly for a battery, a battery cell, a battery and an electrical device.
  • embodiments of the present application provide an end cap assembly for a battery cell, a battery cell, a battery and an electrical device, which can reduce the difficulty of mechanical manufacturing and improve the efficiency of liquid injection, thereby improving the performance of the battery.
  • an end cover assembly for a battery cell including an end cover, the end cover is provided with a multi-functional hole, the multi-functional hole is used for liquid injection and a pressure relief mechanism; an insulating member, The insulating member is arranged on the inner side of the end cover facing the battery cell.
  • the insulating member includes a hollow area and a non-hollow area. The non-hollow area is opposite to the multi-functional hole. The hollow area is located at The periphery of the non-hollowed area.
  • a multifunctional hole is provided on the end cover.
  • the multifunctional hole is used for liquid injection and pressure relief mechanism. That is, the liquid injection hole and the pressure relief mechanism are integrated, which is beneficial to reducing the complexity of the end cover structure. degree, thereby reducing production costs; multi-functional holes are used for liquid injection, and larger holes are also conducive to increasing liquid injection efficiency.
  • an insulating member is provided on the inner side of the end cover facing the battery cell. The insulating member includes a non-hollowed area opposite to the multi-functional hole and a hollowed area located at the periphery of the non-hollowed area.
  • the non-hollowed area is arranged opposite the multi-functional hole, which can prevent the liquid from directly impacting the electrode assembly during liquid injection, thereby avoiding problems such as lithium precipitation; the hollowed-out area is arranged outside the non-hollowed area to ensure that the electrolyte can smoothly flow into the electrode assembly.
  • the insulating member includes a recess and a main body, the main body is connected to the end cover, the recess and the multi-functional hole are arranged oppositely, and the bottom wall of the recess is in contact with the end cover. There is a gap between the end caps.
  • the insulating member must not only ensure that the electrolyte can smoothly flow into the electrode assembly to maintain the normal function of the battery cell, but also prevent the electrolyte from directly impacting the electrode assembly during the injection process, causing the problem of lithium precipitation in the electrode assembly.
  • the insulating member includes two parts: a recess and a main body.
  • the recess and the multi-function hole are arranged oppositely, and there is a gap between the bottom wall of the recess and the end cover to form a recess opposite to the multi-function hole, so that the recess can be used to avoid injection.
  • the non-hollowed area is located in an area of the bottom wall corresponding to the multi-functional hole, and the hollowed area is located in the bottom wall and/or a side wall of the recess.
  • the hollow area allows the electrolyte to smoothly flow into the electrode assembly to maintain the normal function of the battery cell.
  • Setting the area in the bottom wall corresponding to the multi-functional hole as a non-hollow area can avoid the problem of lithium deposition in the electrode assembly caused by the direct impact of the electrolyte on the electrode assembly during injection, thereby improving the performance of the battery cell; at the bottom of the recess Hollow areas are provided on the wall and or side walls to ensure the normal discharge of gases in the battery cells without affecting the normal function of the pressure relief mechanism. They can also be used as electrolyte flow tunnels after injection, while increasing the injection rate. Make the electrolyte evenly distributed.
  • the multi-functional hole is located at the center of the end cover, and the hollow areas in the bottom wall are located on both sides of the non-hollow area. side.
  • the multi-functional hole is located at the center of the end cap in the width direction, that is, the projection of the non-hollow area on the recessed portion on the end cap is also located at the center of the end cap in the width direction.
  • the hollow areas on the bottom wall of the recess are located on both sides of the non-hollow area, which can prevent the electrolyte from flowing to only one side and facilitate the uniform flow of the electrolyte.
  • the projection of the non-hollow area on the end cover covers the multi-functional hole.
  • the multi-functional hole is used to inject liquid and set up a pressure relief mechanism, and the non-hollow area is used to avoid the risk of impact on the electrode assembly during liquid injection.
  • the projection of the non-hollowed area in the thickness direction of the end cover covers the multi-functional hole, that is, the area of the non-hollowed area is larger than the area of the multi-functional hole, which can improve the protection effect of the non-hollowed area on the electrode assembly.
  • the hollow area includes a through hole, and the total area of the through hole is larger than the area of the multifunctional hole.
  • the function of the through holes in the hollow area is, on the one hand, to allow the battery cells to be vented normally without affecting the normal function of the pressure relief mechanism; on the other hand, it is to serve as a flow tunnel for the electrolyte after injection, improving the efficiency of injection. rate.
  • Making the total area of the through holes larger than the area of the multi-functional holes can enhance the effect of the hollow area.
  • the length direction of the through hole is parallel to the width direction of the end cap.
  • through holes are provided in the hollow area. Furthermore, the number of through holes may be multiple. The length direction of the plurality of through holes is parallel to the width direction of the end cap, so that the electrolyte can be evenly distributed in the electrode assembly.
  • the length direction of the through hole is perpendicular to the width direction of the end cap.
  • through holes are provided in the hollow area.
  • the number of through holes may be multiple.
  • the length direction of the multiple through holes is perpendicular to the width direction of the end cover, which is more conducive to making the electrolyte more evenly distributed after liquid injection and drainage, further increasing the liquid injection efficiency.
  • the pressure relief mechanism is welded to an area of the end cover around the multi-function hole facing the outside of the battery cell.
  • the pressure relief mechanism is welded to the multifunctional hole area of the end cover facing the outside of the battery cell, that is, the pressure relief mechanism and the end cover are welded externally, which is more conducive to the sealing of the multifunctional hole.
  • the pressure relief mechanism is covered with a protective layer.
  • a protective layer is provided on the pressure relief mechanism to protect the pressure relief mechanism.
  • an electrode assembly including an electrode assembly; a housing having an opening to accommodate the electrode assembly; and an end cap assembly in any of the above embodiments, the end cap assembly covering the An opening is provided to cover the electrode assembly in the housing.
  • a battery including the battery cell in any of the above embodiments.
  • a fourth aspect provides an electrical device, including the battery in any of the above embodiments, where the battery is used to provide electrical energy.
  • Figure 1 is a schematic structural diagram of a vehicle according to an embodiment of the present application.
  • Figure 2 is an exploded structural diagram of a battery according to an embodiment of the present application.
  • Figure 3 is a schematic diagram of a battery cell according to an embodiment of the present application.
  • Figure 4 is a schematic structural diagram of an end cap assembly according to an embodiment of the present application.
  • Figure 5 is a top view of Figure 4.
  • Figure 6 is a front view of Figure 4.
  • Figure 7 is a bottom view of Figure 4.
  • Figure 8 is a bottom view of the end cap assembly according to another embodiment of the present application.
  • Vehicle 1 battery 2, battery cell 3;
  • Controller 11 motor 12, box 20, electrode assembly 31, housing 32, electrode terminal 33, connecting member 34, pressure relief mechanism 35, end cover assembly 36, insulator 38;
  • Hollow area 3811, non-hollow area 3812, width direction X Hollow area 3811, non-hollow area 3812, width direction X.
  • an embodiment means that a particular feature, structure or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application.
  • the appearances of this phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those skilled in the art understand, both explicitly and implicitly, that the embodiments described herein may be combined with other embodiments.
  • multiple refers to more than two (including two).
  • multiple groups refers to two or more groups (including two groups), and “multiple pieces” refers to It is more than two pieces (including two pieces).
  • the battery cells may include lithium metal secondary batteries, sodium metal batteries, magnesium metal batteries, etc., which are not limited in the embodiments of this application.
  • the battery cell may be in the shape of a cylinder, a flat body, or other shapes, and the embodiments of the present application are not limited to this.
  • Battery cells are generally divided into three types according to packaging methods: cylindrical battery cells, square battery cells and soft-pack battery cells, and the embodiments of the present application are not limited to this. For convenience of explanation, the following embodiments take a lithium metal battery as an example.
  • the battery mentioned in the embodiments of this application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.
  • the battery mentioned in this application may include a battery module or a battery pack.
  • Batteries generally include a box for packaging one or more battery cells. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.
  • the liquid injection holes and explosion-proof valves of existing battery cells usually perform their own duties, but this structural design has certain flaws, namely low utilization of the casing and limited liquid injection pressure.
  • the explosion-proof valve and liquid injection hole are two functional parts of the battery cell. Therefore, these two functional parts need to be welded and sealed. Therefore, the end cover structure of the battery is relatively complex, the manufacturing process is difficult, and the integration is poor. .
  • the pressure relief mechanism needs to be welded on the end cover in advance before liquid injection. Therefore, when filling liquid, the pressure relief mechanism limits the filling pressure. Otherwise, once the pressure is too high, the pressure relief mechanism will be damaged in advance and the battery will fail.
  • embodiments of the present application provide an end cover assembly for a battery cell, which integrates the liquid injection hole and the pressure relief mechanism into one component. This allows the end cover to have a simple structure and reduce the cost of the end cover. The difficulty of mechanical production and improvement of liquid injection efficiency; at the same time, the end cover assembly provided by the embodiment of the present application can avoid the problem of lithium precipitation in the electrode assembly caused by injecting electrolyte directly into the electrode assembly during the battery preparation process, thereby improving the battery cycle performance.
  • the end cap assembly described in the embodiment of this application is suitable for battery cells, batteries, and electrical equipment using batteries.
  • Power-consuming devices can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys and power tools, etc.
  • Vehicles can be fuel vehicles, gas vehicles or new energy vehicles, and new energy vehicles can be pure electric vehicles, hybrid vehicles or extended-range vehicles, etc.
  • spacecraft include aircraft, rockets, space shuttles, spaceships, etc.
  • electric toys include fixed Type or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc.
  • electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, for example, Electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, planers and more.
  • Electric drills Electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, planers and more.
  • the following embodiments take the electrical device as a vehicle as an example.
  • FIG. 1 is a schematic structural diagram of a vehicle 1 provided by an embodiment of the present application.
  • a battery 2 is provided inside the vehicle 1 , and the battery 2 can be provided at the bottom, head, or tail of the vehicle 1 .
  • the battery 2 may be used to power the vehicle 1 , for example, the battery 2 may be used as an operating power source for the vehicle 1 .
  • the vehicle 1 may also include a controller 11 and a motor 12.
  • the controller 11 is used to control the battery 2 to provide power to the motor 12, for example, for starting, navigating and driving the vehicle 1 to meet its power requirements.
  • the battery 2 can not only be used as the operating power source of the vehicle 1, but also can be used as the driving power source of the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.
  • FIG. 2 is an exploded schematic diagram of the battery 2 provided by an embodiment of the present application.
  • the battery 2 includes a box 20 and a battery cell 3 .
  • the battery cell 3 is accommodated in the box 20 .
  • the box 20 is used to accommodate the battery cells 3 .
  • the box 20 can be of various structures.
  • the box body 20 may include a first box body part 201 and a second box body part 202.
  • the first box body part 201 and the second box body part 202 cover each other.
  • the first box body part 201 and the second box body part 202 cover each other.
  • the two box parts 202 jointly define an accommodation space 203 for accommodating the battery cells 3 .
  • the second box part 202 may be a hollow structure with one end open, and the first box part 201 is a plate-like structure.
  • the first box part 201 covers the open side of the second box part 202 to form a receiving space 203
  • the box 20; the first box part 201 and the second box part 202 can also be a hollow structure with one side open, and the open side of the first box part 201 is covered with the open side of the second box part 202 , to form the box 20 with the accommodation space 203 .
  • the first box part 201 and the second box part 202 can be in various shapes, such as cylinder, rectangular parallelepiped, etc.
  • a sealing member may also be provided between the first box part 201 and the second box part 202, such as sealant, sealing ring, etc. .
  • the first box part 201 can also be called an upper box cover, and the second box part 202 can also be called a lower box.
  • the battery 2 has a plurality of battery cells 3 .
  • Multiple battery cells 3 can be connected in series, in parallel, or in mixed connection.
  • Mixed connection means that multiple battery cells 3 are connected in series and in parallel.
  • Multiple battery cells 3 can be directly connected in series or in parallel or mixed together, and then the whole composed of multiple battery cells 3 can be accommodated in the box 20 ; of course, multiple battery cells 3 can also be connected in series first. They may be connected in parallel or mixed to form a battery module (not shown in the figure), and multiple battery modules may be connected in series, parallel or mixed to form a whole, and be accommodated in the box 20 .
  • the multiple battery cells 3 in the battery module can be electrically connected through bus components to achieve parallel, series or mixed connection of the multiple battery cells 3 in the battery module.
  • FIG. 3 it is a schematic structural diagram of a battery cell 3 according to an embodiment of the present application.
  • the battery cell 3 includes one or more electrode assemblies 31 , a casing 321 and an end cover 361 .
  • Housing 321 and end cap 361 form housing or battery case 32 .
  • the wall of the housing 321 and the end cover 361 are both called the wall of the battery cell 3 .
  • the wall of the housing 321 includes a bottom wall and four side walls.
  • the housing 321 is determined according to the combined shape of one or more electrode assemblies 31.
  • the housing 321 can be a hollow rectangular parallelepiped, a cube, or a cylinder, and one surface of the housing 321 has an opening to accommodate one or more electrodes.
  • Component 31 may be placed within housing 321.
  • one of the planes of the housing 321 is an opening surface, that is, the plane does not have a wall so that the inside and outside of the housing 321 are connected.
  • the end surface of the housing 321 is an open surface, that is, the end surface does not have a wall so that the inside and outside of the housing 321 are connected.
  • the end cap 361 covers the opening and is connected with the housing 321 to form a closed cavity in which the electrode assembly 31 is placed.
  • the housing 321 is filled with electrolyte, such as electrolyte solution.
  • the battery cell 3 may also include two electrode terminals 33 , and the two electrode terminals 33 may be provided on the end cap 361 .
  • the end cap 361 is usually in the shape of a flat plate, and two electrode terminals 33 are fixed on the flat surface of the end cap 361.
  • the two electrode terminals 33 are the positive electrode terminal 331 and the negative electrode terminal 332 respectively.
  • Each electrode terminal 33 is provided with a corresponding connecting member 34 , which may also be called a current collecting member 34 . It is located between the end cover 316 and the electrode assembly 31 and is used to electrically connect the electrode assembly 31 and the electrode terminal 33 .
  • the electrode assembly 31 can be provided as a single or multiple electrode assemblies 31 according to actual usage requirements. As shown in FIG. 3, the battery cell 3 is provided with four independent electrode assemblies 31.
  • FIG. 4 is a schematic structural diagram of an end cap assembly according to an embodiment of the present application.
  • FIG. 5 is a top view of FIG. 4
  • FIG. 6 is a front view of FIG. 4
  • FIG. 7 is a bottom view of FIG. 4 .
  • the end cover assembly 36 for the battery cell 3 includes an end cover 361.
  • the end cover 361 is provided with a multi-function hole 362.
  • the multi-function hole 362 is used for liquid injection and pressure relief mechanism 35. ;
  • Insulating member 38 is disposed on the inner side of the end cover 361 facing the battery cell 3.
  • the insulating member 38 includes a hollow area 3811 and a non-hollow area 3812.
  • the non-hollow area 3812 is arranged opposite to the multi-functional hole 362, and the hollow area 3811 Located at the periphery of the non-hollowed area 3812.
  • the housing 32 includes a housing 321 and an end cover 361 , and the housing 32 stores the electrode assembly 31 .
  • the inner side of the battery cell 3 is the side close to the electrode assembly 31; the outer side of the battery cell 3 is the side away from the electrode assembly 31.
  • the pressure relief mechanism 35 is a structural component that is activated to release the internal pressure of the battery cell 3 when the internal pressure or temperature of the battery cell 3 reaches a threshold.
  • the pressure relief mechanism 35 may be a temperature-sensitive pressure relief mechanism configured to melt when the internal temperature of the battery cell 3 provided with the pressure relief mechanism 35 reaches a threshold value; and/or the pressure relief mechanism 35 may be a pressure-sensitive pressure relief mechanism.
  • the pressure-sensitive pressure relief mechanism is configured to rupture when the internal air pressure of the battery cell 3 equipped with the pressure relief mechanism 35 reaches a threshold value. This application does not place any restrictions on the type of the pressure relief mechanism.
  • the end cap 361 may have various structures.
  • the end cap 361 can be a plate-shaped structure.
  • the housing 321 has a rectangular parallelepiped structure, and the end cover 361 has a plate-like structure.
  • the end cover 361 may also have other structures.
  • the end cap 361 is used to isolate the electrolyte from the external environment.
  • the end cap 361 can be made of insulating material, such as plastic; it can also be made of conductive material, such as copper, iron, aluminum, stainless steel or aluminum alloy.
  • the insulating member 38 can play a role in isolating the end cover 361 and the electrode assembly 31 to prevent the end cover 361 from contacting the electrode assembly 31 and causing the risk of short circuit of the battery cell 3 .
  • the insulating member 38 is made of insulating material, and the insulating member 38 may be made of rubber, plastic, or other materials.
  • a multifunctional hole 362 is provided on the end cover 361.
  • the multifunctional hole 362 is used for liquid injection and pressure relief mechanism 35. That is, the liquid injection hole and the pressure relief mechanism 35 are integrated, which is beneficial to reducing the structure of the end cover 361. complexity, thereby reducing the manufacturing cost of the end cap 361; the multi-functional hole 362 is used for liquid injection, and the larger hole is also conducive to increasing the liquid injection efficiency.
  • an insulating member 38 is provided on the inner side of the end cover 361 facing the battery cell 3.
  • the insulating member 38 includes a non-hollowed area 3812 opposite to the multi-functional hole 362 and a hollowed-out area 3811 located on the periphery of the non-hollowed area 3812.
  • the non-hollowed area 3812 is arranged opposite to the multi-functional hole 362, which can prevent the liquid from directly impacting the electrode assembly 31 during liquid injection, thereby avoiding the problem of lithium precipitation in the electrode assembly 31; the hollow area 3811 is arranged on the periphery of the non-hollow area 3812 to ensure that the electrolyte can flow smoothly flows into the electrode assembly 31.
  • the lithium deposition problem caused by injecting the electrolyte directly into the electrode assembly 31 during the preparation process of the battery 2 can be avoided, and the battery 2 can be improved.
  • the cycle performance and liquid injection efficiency are improved, thereby reducing the difficulty of battery mechanical manufacturing and improving the overall performance of the battery.
  • the insulating member 38 includes a recess 381 and a main body 382 .
  • the main body 382 is connected to the end cover 361 .
  • the recess 381 and the multi-functional hole 362 are arranged oppositely.
  • the bottom wall of the recess 381 is in contact with the end cover. There is a gap between 361.
  • the insulating member 38 not only ensures that the electrolyte can flow into the electrode assembly 31 to maintain the normal function of the battery cell 3, but also prevents the electrolyte from directly impacting the electrode assembly 31 during the injection process.
  • Component 31 Lithium precipitation problem
  • the insulating member 38 includes a recessed portion 381 and a main body portion 382, wherein the recessed portion 381 includes a non-hollowed area 3812 and a hollowed-out area 3811. That is, a recess 381 is formed in a portion of the insulating member 38 to allow the electrolyte to flow into the electrode assembly 31 and prevent the electrolyte from directly impacting the electrode assembly 31 .
  • the insulating member 38 includes a recess 381 and a main body 382.
  • the recess 381 and the multi-functional hole 362 are arranged oppositely, and there is a gap between the bottom wall of the recess 381 and the end cover 361 to form a multi-functional hole.
  • Hole 362 is opposite recess 381.
  • the recessed portion 381 can be used to avoid the risk of electrolyte impacting the electrode assembly 31 during liquid injection; the main portion 382 can be used to connect the insulating member 38 with the end cover 361 and isolate the electrode assembly 31 from the end cover 361 .
  • the non-hollow area 3812 is located in the area of the bottom wall corresponding to the multi-functional hole 362, and the hollow area 3811 is located in the bottom wall and/or the side wall of the recess 381.
  • the insulating member 38 is composed of a recessed portion 381 and a main body portion 382 .
  • the recess 381 is composed of a non-hollow area 3812 and a hollow area 3811.
  • the recess 381 opposite to the multi-function hole 362 should prevent the electrolyte from directly impacting the electrode assembly 31. Therefore, the area in the recess 381 corresponding to the multi-function hole 362 should be non- Hollow area 3812.
  • the bottom or side wall of the recess 381 is a hollow area 3811.
  • the bottom wall of the recess 381 may be a hollow area 3811 except for the non-hollow area 3812.
  • the side walls of the recess 381 may also be a hollow area 3811, or one of the two may be selected. In this application, Not limited.
  • the hollow area 3811 allows the electrolyte to smoothly flow into the electrode assembly 31 to maintain the normal function of the battery cell 3 .
  • Setting the area in the bottom wall corresponding to the multi-functional hole 362 as a non-hollow area 3812 can avoid the problem of lithium deposition in the electrode assembly 31 caused by the direct impact of the electrolyte on the electrode assembly 31 during liquid injection, thereby improving the performance of the battery cell 3 ;
  • Providing a hollow area 3811 on the bottom wall and or side wall of the recess 381 can ensure the normal discharge of gas in the battery cell 3 without affecting the normal function of the pressure relief mechanism 35, and can also serve as the flow of electrolyte after liquid injection. tunnel, which increases the liquid injection rate while making the electrolyte evenly distributed.
  • the fact that the multi-function hole 362 is located at the center of the end cover 361 means that the distance between the multi-function hole 362 and the two sides in the width X direction of the end cover 361 is equal.
  • the specific position of the multi-function hole 362 there is no special requirement on the specific position of the multi-function hole 362, and the above is just an example.
  • the recess 381 may extend along the width X direction.
  • this application has no special requirements on the extension direction or position of the recess 381.
  • the position or shape of the recess 381 can be changed according to the shape or position of the multi-function hole 362, as long as the area on the recess 381 opposite to the multi-function hole 362 is not hollowed out. Area 3812 is enough.
  • the hollow area 3811 in the recess 381 serves to allow the electrolyte to flow into the electrode assembly 31 .
  • the hollow areas 3811 on the bottom wall be located on both sides of the non-hollow area 3812, that is, with the non-hollow area 3812 as the center, the two hollow areas 3811 are symmetrically distributed, so that the electrolyte can flow into the electrode assembly 31 more evenly.
  • the multi-functional hole 362 is located at the center of the end cover 361 in the width direction
  • the projection of is also located at the center of the end cap 362 in the width direction X.
  • the hollow areas 3811 on the bottom wall of the recess 381 are located on both sides of the non-hollow area 3812, which prevents the electrolyte from flowing to only one side and is conducive to the uniform flow of the electrolyte.
  • the projection of the non-hollowed area 3812 on the end cap 361 covers the multi-function hole 362 .
  • the non-hollowed area 3812 is provided on the recess 381 of the insulating member 38 to prevent the electrolyte from impacting the electrode assembly 31 during liquid injection.
  • the area of the non-hollowed area 3812 can be increased. That is, in the projection in the thickness direction of the end cover 361 , the non-hollowed area 3812 covers the multi-function hole 362 .
  • the multi-functional hole 362 is used to inject liquid and set up the pressure relief mechanism 35, and the non-hollow area 3812 is used to avoid the risk of impact on the electrode assembly 31 during liquid injection.
  • the projection of the non-hollowed area 3812 in the thickness direction of the end cover 361 covers the multi-functional hole 362, that is, the area of the non-hollowed area 3812 is larger than the area of the multi-functional hole 362. This can improve the protection effect of the non-hollowed area 3812 on the electrode assembly 31. .
  • the hollow area 3811 includes through holes, and the total area of the through holes is greater than the area of the multi-functional hole 362.
  • the hollow area 3811 is used to allow the electrolyte to flow into the electrode assembly 31 normally.
  • Through holes are provided thereon, and further, the number of through holes can be multiple.
  • the electrolyte is allowed to flow in through the through holes, and the non-hollow area 3812 between the through holes can guide the electrolyte to flow near the through holes.
  • this application does not have any restrictions on the shape of the through hole.
  • the through hole can be a regular oblong shape.
  • the function of the through holes in the hollow area 3811 is to allow the battery cells 3 to be vented normally without affecting the normal function of the pressure relief mechanism 35; on the other hand, it is to serve as a flow tunnel for the electrolyte after injection, improving the injection efficiency. liquid rate. Making the total area of the through holes larger than the area of the multi-functional hole 362 can enhance the effect of the hollow area 3811.
  • the length direction of the through hole is parallel to the width direction X of the end cap 361 .
  • through holes are provided in the hollow area 3811. Furthermore, the number of through holes can be multiple, and the length direction of the multiple through holes is parallel to the width direction X of the end cover 361, so that the electrolyte can be evenly distributed in the electrode assembly. 31 in.
  • Figure 8 is a bottom view of the end cap assembly according to another embodiment of the present application. As shown in FIG. 8 , in some embodiments, the length direction of the through hole is perpendicular to the width direction X of the end cap 361 .
  • through holes are provided in the hollow area 3811. Furthermore, the number of through holes can be multiple.
  • the length direction of the multiple through holes is perpendicular to the width direction X of the end cover 361, which is more conducive to allowing electrolysis after liquid injection and drainage.
  • the liquid distribution is more uniform, further increasing the liquid injection efficiency.
  • the pressure relief mechanism 35 is welded to the area around the multi-function hole 362 of the end cover 361 facing the outside of the battery cell 3 .
  • the multifunctional hole 362 is used both for filling liquid and for setting the pressure relief mechanism 35 . That is to say, in the actual production process of the end cap 361, in order not to damage the normal use of the pressure relief mechanism 35, the liquid injection should be completed first before the pressure relief mechanism 35 is set.
  • the pressure relief mechanism 35 and the multi-function hole 362 area of the end cover 361 facing the outside of the battery cell 3 are welded, that is, the pressure relief mechanism 35 and the end cover 361 are welded externally, which is more conducive to the multi-function hole 362 seal.
  • the pressure relief mechanism 35 is covered with a protective layer.
  • the protective layer can be made of non-metallic materials, metal materials or other materials.
  • the present application does not have any restrictions on the material or shape of the protective layer, as long as it can protect the pressure relief mechanism 35 That’s it.
  • a protective layer is provided on the pressure relief mechanism 35 to protect the pressure relief mechanism 35.
  • the embodiment of the present application also provides a battery cell 3 .
  • the battery cell 3 includes an electrode assembly 31; a casing 321 with an opening for accommodating the electrode assembly 31; and the end cover assembly 36 of the aforementioned embodiments, the end cover assembly 36 covers the opening to cover the electrode assembly 31. in the housing 321.
  • the embodiment of the present application also provides a battery 2, including the battery cell 3 in the previous embodiment.
  • the embodiment of the present application also provides an electrical device, including the battery 2 of the previous embodiment, and the battery 2 also provides electric energy.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

Des modes de réalisation de la présente invention concernent un ensemble couvercle d'extrémité pour un élément de batterie, un élément de batterie, une batterie et un dispositif électrique. L'ensemble couvercle d'extrémité comprend : un couvercle d'extrémité, un trou multifonctionnel étant formé dans le couvercle d'extrémité, et le trou multifonctionnel étant utilisé pour l'injection d'un électrolyte et l'agencement d'un mécanisme de relâchement de pression ; et un élément isolant qui est disposé sur le côté interne du couvercle d'extrémité faisant face à l'élément de batterie et comprend une zone évidée et une zone non évidée, la zone évidée étant disposée à l'opposé du trou multifonctionnel, et la zone évidée étant située sur la périphérie de la zone non évidée. Les solutions techniques des modes de réalisation de la présente invention peuvent éviter le problème de plaquage de lithium au niveau d'un ensemble électrode provoqué par l'injection d'un électrolyte lorsqu'il fait directement face à l'ensemble électrode pendant le processus de préparation de batterie, améliorant ainsi les performances de cycle d'une batterie ; en outre, l'ensemble couvercle d'extrémité a une structure simple, ce qui peut réduire la difficulté de fabrication mécanique et améliorer l'efficacité d'injection d'électrolyte.
PCT/CN2022/107305 2022-07-22 2022-07-22 Ensemble couvercle d'extrémité pour élément de batterie, élément de batterie, batterie et dispositif électrique WO2024016308A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN202280068051.0A CN118044059A (zh) 2022-07-22 2022-07-22 用于电池单体的端盖组件、电池单体、电池和用电设备
PCT/CN2022/107305 WO2024016308A1 (fr) 2022-07-22 2022-07-22 Ensemble couvercle d'extrémité pour élément de batterie, élément de batterie, batterie et dispositif électrique

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PCT/CN2022/107305 WO2024016308A1 (fr) 2022-07-22 2022-07-22 Ensemble couvercle d'extrémité pour élément de batterie, élément de batterie, batterie et dispositif électrique

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CN214505620U (zh) * 2021-03-17 2021-10-26 合肥国轩高科动力能源有限公司 方形电池止动架
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JP2014075279A (ja) * 2012-10-04 2014-04-24 Toyota Industries Corp 蓄電装置
CN207938663U (zh) * 2018-01-31 2018-10-02 比亚迪股份有限公司 盖板组件、电池、电池组和车辆
CN207800664U (zh) * 2018-02-01 2018-08-31 宁德时代新能源科技股份有限公司 顶盖组件以及动力电池
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