CN217158424U - Shell, battery monomer, battery and consumer - Google Patents
Shell, battery monomer, battery and consumer Download PDFInfo
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- CN217158424U CN217158424U CN202220429503.0U CN202220429503U CN217158424U CN 217158424 U CN217158424 U CN 217158424U CN 202220429503 U CN202220429503 U CN 202220429503U CN 217158424 U CN217158424 U CN 217158424U
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- 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
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Abstract
The embodiment of the application provides a shell, a single battery, a battery and electric equipment, and belongs to the technical field of batteries. Wherein, the shell is used for accommodating the electrode assembly, and the shell comprises a peripheral wall and a pressure relief groove. The peripheral wall extends in a first direction and is configured to surround an outside of the electrode assembly. The pressure relief groove is provided in the peripheral wall, and the peripheral wall is configured to be ruptured along the pressure relief groove when the pressure or temperature inside the housing reaches a threshold value, so as to relieve the pressure inside the housing. Wherein, the distance between the end part and the pressure relief groove adjacent to the end part of the peripheral wall is less than or equal to one third of the length of the peripheral wall. Like this, make the pressure release groove that closes on mutually with the tip of perisporium more near the tip of perisporium for the perisporium is when splitting the pressure release along the pressure release groove, and the inside emission of battery monomer can be followed the tip position of being closer to the perisporium and discharged fast, more is favorable to the pressure release, improves pressure release rate, improves the free security of battery.
Description
Technical Field
The application relates to the technical field of batteries, in particular to a shell, a battery monomer, a battery and electric equipment.
Background
With the development of new energy technology, batteries are more and more widely used, for example, in mobile phones, notebook computers, battery cars, electric vehicles, electric airplanes, electric ships, electric toy vehicles, electric toy ships, electric toy airplanes, electric tools, and the like.
The battery cell serves as an energy storage element, and generally, an electrode assembly and an electrolyte chemically react with each other to output electric energy. In battery technology, both the cell performance and the cell safety need to be considered. Therefore, how to improve the safety of the battery cell is an urgent problem to be solved in the battery technology.
SUMMERY OF THE UTILITY MODEL
The embodiment of the application provides a shell, a single battery, a battery and electric equipment, and can effectively improve the safety of the single battery.
In a first aspect, an embodiment of the present application provides a case for accommodating an electrode assembly, including: a peripheral wall extending in a first direction and surrounding an outside of the electrode assembly; a pressure relief groove provided in the peripheral wall, the peripheral wall configured to split along the pressure relief groove to relieve pressure inside the housing when the pressure or temperature inside the housing reaches a threshold value; wherein the length of the peripheral wall along the first direction is L 1 A distance L between the end portion and the pressure relief groove adjacent to the end portion of the peripheral wall 2 And satisfies the following conditions: l is 2 ≤L 1 /3。
Among the above-mentioned technical scheme, the pressure release groove sets up on the perisporium of shell, and the pressure release area of shell is difficult sheltered from, more is favorable to the pressure release. The distance between the pressure relief groove that closes on mutually with the tip of perisporium and the tip is one third less than or equal to the length of perisporium for the pressure relief groove that closes on mutually with the tip of perisporium is closer to the tip of perisporium, makes the perisporium when splitting along the pressure relief groove and releasing pressure, and the inside emission of battery monomer can be followed the tip position of being closer to the perisporium and discharged fast, more is favorable to the pressure release, improves the pressure release rate, improves the free security of battery.
In some embodiments, when 300mm ≦ L 1 When less than or equal to 600mm, L 2 Less than or equal to 100 mm. When the length of the peripheral wall is larger, the pressure relief groove close to the end part of the peripheral wall is not too far away from the end part of the peripheral wall, so that the pressure relief groove close to the end part of the peripheral wall is closer to the end part of the peripheral wall, and the pressure relief is more facilitated.
In some embodiments, the peripheral wall is provided with at least one pressure relief groove set, and the pressure relief groove set comprises a plurality of pressure relief grooves arranged at intervals along the circumferential direction of the peripheral wall. This configuration enables the housing to be depressurized from a plurality of positions in the circumferential direction of the peripheral wall, further increasing the depressurization rate.
In some embodiments, the at least one set of pressure relief slots comprises a first set of pressure relief slots and a second set of pressure relief slots; along the first direction, the first pressure relief groove group and the second pressure relief groove group are arranged on the circumferential wall at intervals, and the pressure relief groove in the first pressure relief groove group and the pressure relief groove in the second pressure relief groove group are respectively close to two ends of the circumferential wall. Like this for the discharge of battery monomer in the shell can be followed the quick discharge of the pressure release groove near the both ends of perisporium when thermal runaway to the inside pressure of shell of releasing, make the shell can realize both ends pressure release, further improve pressure release rate, guarantee the free security of battery.
In some embodiments, said at least one pressure relief groove set further comprises a third pressure relief groove set, said third pressure relief groove set being located between said first and second pressure relief groove sets in said first direction. Therefore, the shell can release pressure through the pressure release grooves in the first pressure release groove group and the second pressure release groove group, and can also release pressure through the pressure release grooves between the first pressure release groove group and the second pressure release groove group, so that the pressure release rate is further improved.
In some embodiments, the third pressure relief groove set is located at an intermediate position of the perimeter wall along the first direction. The discharge in the middle area of the peripheral wall in the shell can be discharged through the pressure relief grooves of the third pressure relief groove group, and the pressure relief rate is improved.
In some embodiments, 300mm ≦ L 1 ≤600mm。
In some embodiments, the peripheral wall has a relief portion, the relief groove defining the relief portion, the relief portion configured to flip open outwardly to relieve pressure inside the housing when a pressure or temperature inside the housing reaches a threshold value. When battery cell thermal runaway makes the inside pressure of shell or temperature reach the threshold value, the pressure release portion of being defined out by the pressure release groove will outwards open with the form of upset, and the back is opened to the pressure release portion, and the position that corresponds with the pressure release portion on the perisporium will form the opening, and the emission in the shell will be discharged through the opening, has great pressure release area for the shell can be discharged fast to the emission, has further improved pressure release rate.
In some embodiments, the pressure relief groove includes a first groove portion, a second groove portion, and a third groove portion, the first groove portion and the third groove portion are disposed opposite to each other along the first direction, and the first groove portion, the second groove portion, and the third groove portion are sequentially connected to define the pressure relief portion. The pressure relief groove with the structure is simple in structure, when the pressure or the temperature inside the shell reaches a threshold value, the peripheral wall is split along the second groove part and then split along the first groove part and the third groove part, so that the pressure relief part is turned outwards gradually and opened, the pressure relief part is still connected with the rest part of the peripheral wall, and the pressure relief part cannot be separated from and fly out due to discharge of emissions.
In some embodiments, the second slot portion comprises a linear slot segment extending along the first direction, the linear slot segment having a length L 3 The residual thickness of the peripheral wall at the position of the linear groove section is H, and the requirements are as follows: 1/5H +1/2L 3 Is greater than 0.55. Therefore, the shell meets the pressure relief pressure requirement, and H and L can be set according to the actual process condition 3 The size of (2).
In some embodiments, L 3 ≤10mm，H≤0.4mm。
In some embodiments, the second slot portion further comprises a first rounded chamfer section configured to connect the first slot portion and the linear slot section and a second rounded chamfer section configured to connect the second slot portion and the linear slot section. The setting of first circular arc chamfer section makes first slot portion can more smoothly transition to sharp groove section, and the setting of second circular arc chamfer section makes the second slot portion can more smoothly transition to sharp groove section for the pressure relief portion is more smooth and easy at the outside upset opening in-process.
In some embodiments, the radius R of the first rounded chamfer segment 1 Less than or equal to 5 mm; and/or the radius R of the second arc chamfer section 2 ≤5mm。
In some embodiments, the peripheral wall is a cylinder.
In some embodiments, the pressure relief groove is provided on an outer surface of the peripheral wall. In this way, it is easier to mold the pressure relief groove on the peripheral wall.
In a second aspect, an embodiment of the present application provides a battery cell, including: an electrode assembly; any embodiment of the first aspect provides a case for housing the electrode assembly.
In a third aspect, an embodiment of the present application provides a battery, including: the battery cell provided in any one of the embodiments of the second aspect; and the box body is used for accommodating the battery monomer.
In a fourth aspect, an embodiment of the present application provides an electric device, including the battery provided in any one of the embodiments of the third aspect.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
FIG. 1 is a schematic illustration of a vehicle according to some embodiments of the present application;
fig. 2 is an exploded view of a battery provided in accordance with some embodiments of the present application;
fig. 3 is an exploded view of a battery cell provided in some embodiments of the present application;
fig. 4 is a front view of the housing of the battery cell shown in fig. 3;
FIG. 5 is a front view of a housing provided in accordance with further embodiments of the present application;
FIG. 6 is an enlarged partial view of a housing provided by some embodiments of the present application;
FIG. 7 is a cross-sectional view A-A of the housing shown in FIG. 6;
FIG. 8 is a flow chart of a method of manufacturing a housing provided by some embodiments of the present application;
fig. 9 is a schematic block diagram of an apparatus for manufacturing a housing provided in some embodiments of the present application.
Icon: 10-a box body; 11-a first part; 12-a second part; 20-a battery cell; 21-a housing; 211-a peripheral wall; 2111-first end portion; 2112-second end; 2113-relief; 212-bottom wall; 213-end cap; 2131-electrode terminals; 214-a pressure relief groove; 214 a-a first set of pressure relief slots; 214 b-a second set of pressure relief grooves; 214 c-a third set of pressure relief grooves; 2141-a first trough portion; 2142-a second trough portion; 2142 a-a linear groove segment; 2142 b-first rounded section; 2142 c-a second rounded section; 2143-a third trough portion; 22-an electrode assembly; 221-positive pole tab; 222-a negative electrode tab; 23-a current collecting member; 100-a battery; 200-a controller; 300-a motor; 1000-a vehicle; 2000-manufacturing equipment; 2100-providing means; 2200-a processing device; z-first direction.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the application in the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions. The terms "first," "second," and the like in the description and claims of this application or in the above-described drawings are used for distinguishing between different elements and not for describing a particular sequential or chronological order.
Reference in the specification to "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 specification. The appearances of the 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.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "attached" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
The term "and/or" in this application is only one kind of association relationship describing the associated object, and means that there may be three kinds of relationships, for example, a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" in this application generally indicates that the former and latter related objects are in an "or" relationship.
In the embodiments of the present application, like reference numerals denote like parts, and a detailed description of the same parts is omitted in different embodiments for the sake of brevity. It should be understood that the thickness, length, width and other dimensions of the various components in the embodiments of the present application and the overall thickness, length, width and other dimensions of the integrated device shown in the drawings are only exemplary and should not constitute any limitation to the present application.
The appearances of "a plurality" in this application are intended to mean more than two (including two).
In the present application, the battery cell may include a lithium ion secondary battery, a lithium ion primary battery, a lithium sulfur battery, a sodium lithium ion battery, a sodium ion battery, a magnesium ion battery, or the like, which is not limited in the embodiments of the present application. The battery cell may be a cylinder, a flat body, a rectangular parallelepiped, or other shapes, which is not limited in the embodiments of the present application. The battery cells are generally divided into three types in an encapsulation manner: the cylindrical battery cell, the square battery cell 20 and the pouch battery cell, which is not limited in the embodiment of the present application.
Reference to a battery in embodiments of the present application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in the present application may include a battery module or a battery pack, etc. Batteries generally include a case for enclosing one or more battery cells. The box can avoid liquid or other foreign matters to influence the charging or discharging of battery monomer.
The battery monomer comprises an electrode assembly and electrolyte, wherein the electrode assembly comprises a positive pole piece, a negative pole piece and an isolating membrane. The battery cell mainly depends on metal ions to move between the positive pole piece and the negative pole piece to work. The positive pole piece includes anodal mass flow body and anodal active substance layer, and anodal active substance layer coats in anodal mass flow body's surface, and the anodal mass flow body protrusion in the anodal mass flow body that has coated anodal active substance layer of uncoated anodal active substance layer, and the anodal mass flow body that does not coat anodal active substance layer is as anodal utmost point ear. Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate, or the like. The negative pole piece includes negative pole mass flow body and negative pole active substance layer, and the negative pole active substance layer coats in the surface of negative pole mass flow body, and the negative pole mass flow body protrusion in the negative pole mass flow body of coating the negative pole active substance layer not coating the negative pole active substance layer, and the negative pole mass flow body of not coating the negative pole active substance layer is as negative pole utmost point ear. The material of the negative electrode collector may be copper, and the negative electrode active material may be carbon, silicon, or the like. In order to ensure that the fuse is not fused when a large current is passed, the number of the positive electrode tabs is multiple and the positive electrode tabs are stacked together, and the number of the negative electrode tabs is multiple and the negative electrode tabs are stacked together. The material of the isolation film may be PP (polypropylene) or PE (polyethylene). In addition, the electrode assembly may have a winding structure or a lamination structure, and the embodiment of the present application is not limited thereto.
The development of battery technology needs to consider various design factors, such as energy density, cycle life, discharge capacity, charge and discharge rate, and other performance parameters, and also needs to consider the safety of the battery.
For the single battery, in order to ensure the safety of the single battery, a pressure relief mechanism is generally disposed in the single battery, and the pressure inside the single battery is relieved through the pressure relief mechanism.
The inventor has noted that even if a pressure relief mechanism is provided in the battery cell, the risk of fire or explosion of the battery cell often occurs. The inventor researches and discovers that the conventional pressure relief mechanism is generally arranged on the end cover of a battery cell, and after a plurality of battery cells are stacked together, the pressure relief mechanism on the end cover can be shielded by other battery cells, so that pressure relief is not timely, and safety accidents occur.
In view of this, the embodiments of the present application provide a housing, in which the pressure relief groove is disposed on a peripheral wall of the housing, and a distance between the pressure relief groove adjacent to an end of the peripheral wall and the end is less than or equal to one third of a length of the peripheral wall along an extending direction of the peripheral wall.
In such a battery cell, the pressure relief groove is provided in the peripheral wall of the case, and the pressure relief area of the case is not easily shielded, which is more favorable for pressure relief. The distance between the pressure release groove that closes on mutually with the tip of perisporium and the tip is less than or equal to the one third of the length of perisporium for the pressure release groove that closes on mutually with the tip of perisporium is closer to the tip of perisporium, makes the perisporium when splitting the pressure release along the pressure release groove, and the inside emission of battery monomer can be followed the tip position of being closer to the perisporium and discharged fast, more is favorable to the pressure release, improves pressure release rate, improves the free security of battery.
The housing described in the embodiments of the present application is suitable for a battery cell, a battery, and an electric device using the battery.
The electric equipment can be vehicles, mobile phones, portable equipment, notebook computers, ships, spacecrafts, electric toys, electric tools and the like. The vehicle can be a fuel oil vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or a range-extended vehicle and the like; spacecraft include aircraft, rockets, space shuttles, and spacecraft, among others; electric toys include stationary or mobile electric toys, such as game machines, electric car toys, electric ship toys, electric airplane toys, and the like; the electric power tools include metal cutting electric power tools, grinding electric power tools, assembly electric power tools, and electric power tools for railways, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, electric impact drills, concrete vibrators, and electric planers. The embodiment of the present application does not specifically limit the above-mentioned electric devices.
For convenience of explanation, the following embodiments will be described by taking an electric device as an example of a vehicle.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a vehicle 1000 according to some embodiments of the present disclosure. The battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom or the head or the tail of the vehicle 1000. The battery 100 may be used for power supply of the vehicle 1000, for example, the battery 100 may serve as an operation power source of the vehicle 1000.
The vehicle 1000 may further include a controller 200 and a motor 300, the controller 200 being configured to control the battery 100 to supply power to the motor 300, for example, for starting, navigation, and operational power requirements while the vehicle 1000 is traveling.
In some embodiments of the present application, the battery 100 may be used not only as an operating power source of the vehicle 1000, but also as a driving power source of the vehicle 1000, instead of or in part of fuel or natural gas, to provide driving power for the vehicle 1000.
Referring to fig. 2, fig. 2 is an exploded view of a battery 100 according to some embodiments of the present disclosure, in which the battery 100 includes a case 10 and a battery cell 20, and the case 10 is used for accommodating the battery cell 20.
The case 10 is a component for accommodating the battery cell 20, the case 10 provides an accommodating space for the battery cell 20, and the case 10 may have various structures. In some embodiments, the case 10 may include a first portion 11 and a second portion 12, and the first portion 11 and the second portion 12 cover each other to define a receiving space for receiving the battery cell 20. The first and second portions 11 and 12 may be in various shapes, such as rectangular parallelepiped, cylindrical, etc. The first portion 11 may be a hollow structure with one side open, the second portion 12 may also be a hollow structure with one side open, and the open side of the second portion 12 is covered on the open side of the first portion 11, thereby forming the box body 10 with a receiving space. The first portion 11 may have a hollow structure with one side opened, the second portion 12 may have a plate-like structure, and the second portion 12 may cover the opened side of the first portion 11 to form the case 10 having an accommodating space. The first part 11 and the second part 12 may be sealed by a sealing element, which may be a sealing ring, a sealant or the like.
In the battery 100, one or more battery cells 20 may be provided. If there are a plurality of battery cells 20, the plurality of battery cells 20 may be connected in series, in parallel, or in series-parallel, where in series-parallel refers to that the plurality of battery cells 20 are connected in series or in parallel. A plurality of battery cells 20 may be connected in series, in parallel, or in series-parallel to form a battery module, and a plurality of battery modules may be connected in series, in parallel, or in series-parallel to form a whole, and may be accommodated in the case 10. Or all the battery cells 20 may be directly connected in series or in parallel or in series-parallel, and the whole of all the battery cells 20 is accommodated in the case 10.
In some embodiments, the battery 100 may further include a bus member, and the plurality of battery cells 20 may be electrically connected to each other through the bus member, so as to connect the plurality of battery cells 20 in series or in parallel or in series-parallel. The bus member may be a metal conductor, such as copper, iron, aluminum, stainless steel, aluminum alloy, or the like.
Referring to fig. 3, fig. 3 is an exploded view of a battery cell 20 according to some embodiments of the present disclosure, in which the battery cell 20 includes a case 21 and an electrode assembly 22, and the electrode assembly 22 is accommodated in the case 21.
The case 21 is a member that houses the electrode assembly 22. The housing 21 may be in various shapes, such as a cylinder, a rectangular parallelepiped, or the like. The housing 21 may include a peripheral wall 211, a bottom wall 212, and an end cap 213. The bottom wall 212 is disposed at one end of the peripheral wall 211 in the extending direction, the peripheral wall 211 surrounds the edge of the bottom wall 212, and the peripheral wall 211 and the bottom wall 212 are integrally formed. An end of the peripheral wall 211 opposite to the bottom wall 212 is opened in the extending direction of the peripheral wall 211. The end cap 213 serves to close the opening of the peripheral wall 211, so that a closed space for accommodating the electrode assembly 22, the electrolyte, and the like is formed inside the case 21. The end cap 213 may be provided with an electrode terminal 2131, and the electrode terminal 2131 is used to electrically connect with the electrode assembly 22.
The electrode assembly 22 is a component in the battery cell 20 where electrochemical reactions occur. The electrode assembly 22 may be a cylinder, a rectangular parallelepiped, or the like. If electrode assembly 22 is cylindrical, housing 21 may also be cylindrical; if the electrode assembly 22 is a rectangular parallelepiped, the case 21 may be a rectangular parallelepiped.
The electrode assembly 22 may include a positive electrode tab, a negative electrode tab, and a separator. The electrode assembly 22 may have a winding type structure formed by winding a positive electrode tab, a separator, and a negative electrode tab, or a lamination type structure formed by laminating a positive electrode tab, a separator, and a negative electrode tab. The positive electrode sheet may include a positive electrode current collector and positive electrode active material layers coated on opposite sides of the positive electrode current collector. The negative electrode tab may include a negative electrode current collector and a negative electrode active material layer coated on opposite sides of the negative electrode current collector. The electrode assembly 22 has a positive electrode tab 221 and a negative electrode tab 222, and the positive electrode tab 221 may be a portion of the positive electrode sheet not coated with the positive electrode active material layer, and the negative electrode tab 222 may be a portion of the negative electrode sheet not coated with the negative electrode active material layer. The positive electrode tab 221 may be electrically connected to the electrode terminal 2131 of the end cap 213, and the negative electrode tab 222 may be electrically connected to the bottom wall 212 of the casing 21.
Of course, the positive electrode tab 221 and the electrode terminal 2131 may be directly connected, for example, the positive electrode tab 221 and the electrode terminal 2131 are directly welded; the positive electrode tab 221 and the electrode terminal 2131 may be indirectly connected, for example, the positive electrode tab 221 and the electrode terminal 2131 may be indirectly connected through the current collecting member 23. The negative tab 222 and the bottom wall 212 may be directly connected, for example, the negative tab 222 and the bottom wall 212 are directly welded; the negative tab 222 and the bottom wall 212 may also be indirectly connected, for example, the negative tab 222 and the bottom wall 212 are indirectly connected through the current collecting member 23. Illustratively, in fig. 3, the positive electrode tab 221 and the electrode terminal 2131 are indirectly connected via the current collecting member 23, and the negative electrode tab 222 is directly welded to the bottom wall 212.
Referring to fig. 4, fig. 4 is a front view of the casing 21 of the battery cell 20 shown in fig. 3, in an embodiment of the present application, the casing 21 is provided for accommodating the electrode assembly 22, and the casing 21 includes a peripheral wall 211 and a pressure relief groove 214. The peripheral wall 211 extends in the first direction Z and is provided to surround the outside of the electrode assembly 22. The pressure relief groove 214 is provided in the peripheral wall 211, and the peripheral wall 211 is configured to be ruptured along the pressure relief groove 214 to relieve the pressure inside the housing 21 when the pressure or temperature inside the housing 21 reaches a threshold value. Wherein the length of the peripheral wall 211 along the first direction Z is L 1 A distance L between the end portion and the pressure relief groove 214 adjacent to the end portion of the peripheral wall 211 2 And satisfies the following conditions: l is 2 ≤L 1 /3。
The peripheral wall 211 is a main body portion of the case 21 extending in the first direction Z, and after the electrode assembly 22 is accommodated in the case 21, the peripheral wall 211 is to be surrounded on the outside of the electrode assembly 22. The first direction Z is a longitudinal direction of the peripheral wall 211. The peripheral wall 211 may be of various shapes such as a cylinder, a rectangular parallelepiped, or the like. In some embodiments, the housing 21 may further include a bottom wall 212 and an end cap 213, the bottom wall 212 and the end cap 213 are respectively disposed at two ends of the peripheral wall 211 along the first direction Z, and the bottom wall 212 is integrally formed with the peripheral wall 211. In other embodiments, the housing 21 may further include two end caps 213, and the two end caps 213 cover both ends of the peripheral wall 211 along the first direction Z.
The pressure relief groove 214 may be formed in the peripheral wall 211 in various ways, such as punch forming, milling, etc. The relief groove 214 may be in a variety of shapes, such as, for example, annular, "U" -shaped, "C" -shaped, "ten" "" one "-shaped, etc. The position of the peripheral wall 211 where the pressure relief groove 214 is provided is a relatively weak position, and when the pressure or temperature inside the housing 21 reaches a threshold value, the position of the peripheral wall 211 where the pressure relief groove 214 is provided will be ruptured along the pressure relief groove 214, so as to achieve the purpose of relieving the pressure inside the housing 21.
The pressure relief groove 214 adjacent to the end of the peripheral wall 211 is the pressure relief groove 214 on the peripheral wall 211 closest to the end of the peripheral wall 211. Taking as an example that the peripheral wall 211 has a first end 2111 and a second end 2112 opposite to each other in the first direction Z, and a first pressure relief groove, a second pressure relief groove, and a third pressure relief groove are sequentially arranged on the peripheral wall 211 from the first end 2111 to the second end 2112, the pressure relief groove 214 adjacent to the first end 2111 is the first pressure relief groove, and the pressure relief groove 214 adjacent to the second end is the second pressure relief groove. The distance between the end portion and the pressure relief groove 214 adjacent to the end portion of the peripheral wall 211 in the first direction Z is measured from the pressure relief groove 214 to the closest position to the end portion of the peripheral wall 211.
In the present embodiment, the pressure relief groove 214 is disposed on the peripheral wall 211 of the housing 21, so that the pressure relief area of the housing 21 is not easily shielded, which is more favorable for pressure relief.
The inventors found that, in the battery cell 20, when the pressure or temperature inside the battery cell 20 increases due to thermal runaway, since the middle region of the inside of the case 21 is occupied by the electrode assembly 22, there is a gap in the end region of the case 21, and the exhaust inside the battery cell 20 is more accumulated at the end of the case 21.
Therefore, in the embodiment of the present application, the distance between the pressure relief groove 214 adjacent to the end of the peripheral wall 211 and the end is less than or equal to one third of the length of the peripheral wall 211, so that the pressure relief groove 214 adjacent to the end of the peripheral wall 211 is closer to the end of the peripheral wall 211, and when the peripheral wall 211 is cracked along the pressure relief groove 214 for pressure relief, the exhaust inside the battery cell 20 can be quickly discharged from the end position closer to the peripheral wall 211, which is more beneficial for pressure relief, the pressure relief rate is increased, and the safety of the battery cell 20 is improved.
In some embodiments, when 300mm ≦ L 1 When less than or equal to 600mm, L 2 ≤100mm。
The length of the peripheral wall 211 is 300mm to 600mm, and the entire length of the peripheral wall 211 is long. Thus, will L 2 The pressure release groove 214 adjacent to the end of the peripheral wall 211 is set to be not more than 100mm so that it is not too far from the end of the peripheral wall 211, so that the pressure release groove 214 adjacent to the end of the peripheral wall 211 is closer to the end of the peripheral wall 211, which is more advantageous for pressure release.
In some embodiments, the perimeter wall 211 is provided with at least one pressure relief groove set comprising a plurality of pressure relief grooves 214 spaced circumferentially along the perimeter wall 211.
The number of pressure relief grooves in the peripheral wall 211 may be one, two, three, etc. The pressure relief slots 214 in each pressure relief slot group may be two, three, four, etc. Taking the peripheral wall 211 as a cylinder as an example, the plurality of pressure relief grooves 214 in the pressure relief groove group may be uniformly distributed at intervals along the circumferential direction of the peripheral wall 211.
In the present embodiment, the plurality of pressure relief grooves 214 in the pressure relief groove group are arranged at intervals along the circumferential direction of the circumferential wall 211, so that the housing 21 can be depressurized from a plurality of positions in the circumferential direction of the circumferential wall 211, further increasing the rate of depressurization.
In some embodiments, at least one set of pressure relief slots includes a first set of pressure relief slots 214a and a second set of pressure relief slots 214 b. Along the first direction Z, the first pressure relief groove group 214a and the second pressure relief groove group 214b are disposed at intervals on the peripheral wall 211, and the pressure relief grooves 214 in the first pressure relief groove group 214a and the pressure relief grooves 214 in the second pressure relief groove group 214b are respectively adjacent to two ends of the peripheral wall 211.
It will be appreciated that the perimeter wall 211 includes a plurality of pressure relief groove sets, one of the plurality of pressure relief groove sets adjacent one end of the perimeter wall 211 is a first pressure relief groove set 214a, and one of the plurality of pressure relief groove sets adjacent the other end of the perimeter wall 211 is a second pressure relief groove set 214 b. Only two pressure relief groove sets, namely a first pressure relief groove set 214a and a second pressure relief groove set 214b, may be provided in the peripheral wall 211; of course, the peripheral wall 211 may be provided with a pressure relief groove group other than the first pressure relief groove group 214a and the second pressure relief groove group 214 b. Illustratively, as shown in FIG. 4, the length L of the peripheral wall 211 1 If < 300mm, the peripheral wall 211 may beOnly a first and a second set of pressure relief grooves 214a, 214b are provided.
Illustratively, a first pressure relief groove set 214a and a second pressure relief groove set 214b are disposed in sequence from a first end 2111 to a second end 2112 of the perimeter wall 211, the pressure relief groove 214 in the first pressure relief groove set 214a being adjacent the first end 2111, and the pressure relief groove 214 in the second pressure relief groove set 214b being adjacent the second end 2112. The distance between the pressure relief groove 214 of the first pressure relief groove set 214a and the first end 2111 is L 2 The distance between the pressure relief groove 214 of the second pressure relief groove group 214b and the second end 2112 is also L 2 。
The distance from the first pressure relief groove group 214a to the first end 2111 and the distance from the second pressure relief groove group 214b to the second end 2112 may be equal to or different from each other, as long as they are not greater than one third of the length of the peripheral wall 211.
In this embodiment, since the pressure relief grooves 214 in the first pressure relief groove group 214a and the pressure relief grooves 214 in the second pressure relief groove group 214b are respectively adjacent to two ends of the peripheral wall 211, when the battery cell 20 is in thermal runaway, the exhaust in the housing 21 can be rapidly discharged from the pressure relief grooves 214 near the two ends of the peripheral wall 211 to relieve the pressure inside the housing 21, so that the housing 21 can be depressurized at two ends, thereby further improving the depressurization rate and ensuring the safety of the battery cell 20.
In some embodiments, referring to fig. 5, fig. 5 is a front view of the housing 21 according to other embodiments of the present disclosure, where at least one pressure relief groove set further includes a third pressure relief groove set 214c, and the third pressure relief groove set 214c is located between the first pressure relief groove set 214a and the second pressure relief groove set 214b along the first direction Z.
The third pressure relief groove set 214c may be disposed at an intermediate position between the first pressure relief groove set 214a and the second pressure relief groove set 214b, or may be closer to one of the first pressure relief groove set 214a and the second pressure relief groove set 214 b. The first pressure relief groove group 214a may be provided at an intermediate position of the peripheral wall 211 or may be offset from the intermediate position of the peripheral wall 211.
In this embodiment, since the peripheral wall 211 is further provided with the third pressure relief groove group 214c, the pressure of the outer case 21 can be relieved through the pressure relief grooves 214 in the first pressure relief groove group 214a and the pressure relief grooves 214 in the second pressure relief groove group 214b, and the pressure relief rate can be further increased by relieving the pressure through the pressure relief grooves 214 in the third pressure relief groove group 214c located between the first pressure relief groove group 214a and the second pressure relief groove group 214 b.
In some embodiments, with continued reference to fig. 5, the third pressure relief groove set 214c is located at an intermediate position of the peripheral wall 211 along the first direction Z.
The distance from the intermediate position of the peripheral wall 211 to the first end 2111 of the peripheral wall 211 is equal to the distance from the intermediate position of the peripheral wall 211 to the second end 2112 of the peripheral wall 211. Illustratively, the distance between first pressure relief groove set 214a and first end 2111 is equal to the distance between second pressure relief groove set 214b and second end 2112.
Since the third pressure relief groove group 214c is located at the middle position of the peripheral wall 211, the discharge in the middle area of the peripheral wall 211 in the housing 21 can be discharged through the pressure relief groove 214 of the third pressure relief groove group 214c, and the pressure relief rate is increased.
In some embodiments, as shown in FIG. 5, 300mm ≦ L 1 ≤600mm。
The length of the peripheral wall 211 is 300mm to 600mm, and the entire length of the peripheral wall 211 is long. In this case, a third pressure relief groove set 214c may be disposed between the first pressure relief groove set 214a and the second pressure relief groove set 214b to increase the pressure relief rate of the housing 21, so that the exhaust inside the battery cell 20 can be discharged quickly.
In some embodiments, referring to fig. 6, fig. 6 is a partially enlarged view of the housing 21 provided in some embodiments of the present application, the peripheral wall 211 has a relief portion 2113, the relief groove 214 defines the relief portion 2113, and the relief portion 2113 is configured to flip open outwardly when the pressure or temperature inside the housing 21 reaches a threshold value, so as to relieve the pressure inside the housing 21.
The pressure relief portion 2113 is an area on the peripheral wall 211 defined by the pressure relief groove 214, and the pressure relief groove 214 is located at an edge position of the pressure relief portion 2113. Taking the pressure relief groove 214 as "U" or "C", the pressure relief groove 214 defines a pressure relief portion 2113, and the pressure relief portion 2113 does not separate from the peripheral wall 211 after being turned outwards. In the embodiment where the pressure relief groove 214 is "C" shaped, the pressure relief groove 214 is an arc-shaped groove, such as a semicircular groove, with a distance between the end and the end.
When the pressure or temperature inside the housing 21 reaches a threshold value due to thermal runaway of the battery cell 20, after the peripheral wall 211 is cracked along the pressure relief groove 214, the pressure relief portion 2113 defined by the pressure relief groove 214 is opened in an inverted manner, after the pressure relief portion 2113 is opened, an opening portion is formed in the position, corresponding to the pressure relief portion 2113, of the peripheral wall 211, and the emissions inside the housing 21 are discharged through the opening portion, so that the pressure relief area is large, the emissions can be rapidly discharged out of the housing 21, and the pressure relief rate is further improved.
In some embodiments, the pressure relief groove 214 may include a first groove portion 2141, a second groove portion 2142, and a third groove portion 2143, the first groove portion 2141 and the third groove portion 2143 are disposed opposite to each other along the first direction Z, and the first groove portion 2141, the second groove portion 2142, and the third groove portion 2143 are sequentially connected to define the pressure relief portion 2113.
The first groove portions 2141 and the third groove portions 2143 each extend in the circumferential direction of the peripheral wall 211, and the second groove portions 2142 may be linear portions extending in the first direction Z or may be circular arc portions.
Illustratively, the first trough portion 2141, the second trough portion 2142, and the third trough portion 2143 have equal depths.
It will be appreciated that in the present embodiment, the pressure relief groove 214 is generally "U" shaped. The pressure relief groove 214 of this structure is simple in structure, and when the pressure or temperature inside the housing 21 reaches a threshold value, the peripheral wall 211 splits along the second groove portion 2142, and then splits along the first groove portion 2141 and the third groove portion 2143, so that the pressure relief portion 2113 gradually turns outward and opens, and the pressure relief portion 2113 remains connected to the rest of the peripheral wall 211 and does not escape and fly due to the discharge of the emissions.
In some embodiments, referring to fig. 6 and 7, fig. 7 is a cross-sectional view a-a of the housing 21 shown in fig. 6, the second groove portion 2142 includes a straight groove section 2142a extending along the first direction Z, and the length of the straight groove section 2142a is L 3 The residual thickness of the peripheral wall 211 at the position of the linear groove section 2142a is H, satisfying: 1/5 XH +1/2 XL 3 Is greater than 0.55. The residual thickness is the residual thickness of the linear groove section 2142a after the linear groove section 2142a is arranged on the peripheral wall 211And (4) the rest thickness.
Therefore, the shell 21 meets the pressure relief pressure requirement, and H and L can be set according to the actual process condition 3 For example, when the size of H needs to be set larger, L may be set to be larger correspondingly 3 Is arranged smaller. The relief pressure referred to here is the firing pressure of the case 21, and the relief portion 2113 of the peripheral wall 211 is not opened to relieve pressure until the internal pressure of the case 21 does not reach the firing pressure, and the relief portion 2113 starts to be opened to relieve pressure when the internal pressure of the case 21 does not reach the firing pressure.
Exemplary, 1/5 XH +1/2 XL 3 In this case, the pressure relief pressure of the housing 21 is more preferable than 34/15.
In some embodiments, L 3 ≤10mm，H≤0.4mm。
The linear trough section 2142a has a length L 3 The length of the linear groove section 2142a is not more than 10mm, the residual thickness of the peripheral wall 211 at the position of the linear groove section 2142a is not more than 0.4mm, the residual thickness is not more than 0.4mm, the peripheral wall 211 is easier to crack from the position of the linear groove section 2142a of the second groove section 2142 when the pressure inside the housing 21 reaches the initiation pressure, and finally the pressure relief portion 2113 is turned outwards and opened.
In some embodiments, with continued reference to fig. 6, the second trough portion 2142 further includes a first rounded section 2142b and a second rounded section 2142c, the first rounded section 2142b is configured to connect the first trough portion 2141 and the linear trough portion 2142a, and the second rounded section 2142c is configured to connect the second trough portion 2142 and the linear trough portion 2142 a.
The radius of the first rounded corner portions 2142b and the radius of the second rounded corner portions 2142c may be equal or different.
Illustratively, the first trough portion 2141 and the linear trough portion 2142a are both tangent to the first rounded chamfer portion 2142b, and the second trough portion 2142 and the linear trough portion 2142a are both tangent to the second rounded chamfer portion 2142 c.
In the present embodiment, the first rounded chamfer section 2142b is disposed such that the first groove portion 2141 can be more smoothly transited to the linear groove portion 2142a, and the second rounded chamfer section 2142c is disposed such that the second groove portion 2142 can be more smoothly transited to the linear groove portion 2142a, such that the pressure relief portion 2113 can be more smoothly opened during the outward turning.
In some embodiments, the radius R of the first rounded chamfer section 2142b 1 Less than or equal to 5 mm; and/or the radius R of the second rounded chamfer section 2142c 2 ≤5mm。
In some embodiments, the peripheral wall 211 is a cylinder.
Understandably, the housing 21 is a cylindrical structure suitable for cylindrical battery cells.
In the embodiment where the first groove portion 2141, the second groove portion 2142 and the third groove portion 2143 of the pressure relief groove 214 are connected in sequence to define the pressure relief portion 2113, the pressure relief portion 2113 is in a bent state because the peripheral wall 211 is a cylinder. After the internal pressure or temperature of the housing 21 reaches a threshold value to cause the peripheral wall 211 to split along the relief groove 214, the relief portion 2113 in the bent state is more easily turned outward open to relieve the pressure inside the housing 21.
In some embodiments, the pressure relief groove 214 is provided on the outer surface of the peripheral wall 211. Thus, the pressure relief groove 214 is more easily molded in the peripheral wall 211.
In other embodiments, the pressure relief groove 214 may also be disposed on the inner surface of the peripheral wall 211.
The embodiment of the application provides a battery cell 20, which comprises an electrode assembly 22 and a shell 21 provided by any one of the above embodiments, wherein the shell 21 is used for accommodating the electrode assembly 22.
The embodiment of the application provides a battery 100, which comprises a box body 10 and a battery cell 20 provided by any one of the above embodiments, wherein the box body 10 is used for accommodating the battery cell 20.
The embodiment of the present application provides an electric device, including the battery 100 provided in any one of the above embodiments.
The powered device may be any of the devices described above that employ battery 100.
Referring to fig. 4, the present embodiment provides a cylindrical case for accommodating the electrode assembly 22. The peripheral wall 211 of the housing 21 is provided with a first pressure relief groove group 214a and a second pressure relief groove group 214b adjacent to both ends of the peripheral wall 211, respectively, a plurality of pressure relief grooves 214 in the first pressure relief groove group 214a are spaced apart along the circumferential direction of the peripheral wall 211, and a plurality of pressure relief grooves 214 in the second pressure relief groove group 214b are spaced apart along the circumferential direction of the peripheral wall 211. The distance between the pressure relief groove 214 in the first pressure relief groove group 214a and one end of the peripheral wall 211 is equal to or less than one third of the length of the peripheral wall 211, and the distance between the pressure relief groove 214 in the second pressure relief groove group 214b and the other end of the peripheral wall 211 is equal to or less than one third of the length of the peripheral wall 211. Wherein the pressure relief groove 214 is substantially "U" shaped.
In such a cylindrical case, the distance between the pressure relief groove 214 in the first pressure relief groove group 214a and one end portion of the peripheral wall 211 is equal to or less than one third of the length of the peripheral wall 211, and the distance between the pressure relief groove 214 in the second pressure relief groove group 214b and the other end portion of the peripheral wall 211 is equal to or less than one third of the length of the peripheral wall 211, so that the pressure relief groove 214 in the first pressure relief groove group 214a and the pressure relief groove 214 in the second pressure relief groove group 214b are respectively close to both end portions of the peripheral wall 211. When the peripheral wall 211 is cracked along the pressure relief groove 214 for pressure relief, the emissions inside the battery cell 20 can be rapidly discharged from the two end positions closer to the peripheral wall 211, which is more beneficial to pressure relief, improves the pressure relief rate, and improves the safety of the battery cell 20.
Referring to fig. 8, fig. 8 is a flowchart of a manufacturing method of the housing 21 according to some embodiments of the present application, and the embodiment of the present application provides a manufacturing method of the housing 21, including:
s100: providing a housing 21, the housing 21 having a peripheral wall 211 extending in a first direction Z;
s200: a pressure relief groove 214 is formed in the peripheral wall 211;
wherein the perimeter wall 211 is configured to rupture along the relief groove 214 to relieve pressure inside the housing 21 when the pressure or temperature inside the housing 21 reaches a threshold value; the peripheral wall 211 has a length L along the first direction Z 1 A distance L between the end portion and the pressure relief groove 214 adjacent to the end portion of the peripheral wall 211 2 And satisfies the following conditions: l is 2 ≤L 1 /3。
It should be noted that, for the structure of the housing 21 manufactured by the manufacturing method provided in the foregoing embodiments, reference may be made to the housing 21 provided in the foregoing embodiments, and details are not described herein again.
Referring to fig. 9, fig. 9 is a schematic block diagram of a manufacturing apparatus 2000 for a housing 21 according to some embodiments of the present application, and the manufacturing apparatus 2000 for a housing 21 according to the embodiments of the present application further includes a providing device 2100 and a processing device 2200.
The providing device 2100 is used to provide a housing 21, the housing 21 having a peripheral wall 211 extending in a first direction Z. The processing device 2200 is used for processing the pressure relief groove 214 in the peripheral wall 211. Wherein the perimeter wall 211 is configured to rupture along the pressure relief groove 214 to relieve pressure inside the housing 21 when the pressure or temperature inside the housing 21 reaches a threshold value. The peripheral wall 211 has a length L along the first direction Z 1 A distance L between the end portion and the pressure relief groove 214 adjacent to the end portion of the peripheral wall 211 2 And satisfies the following conditions: l is 2 ≤L 1 /3。
It should be noted that, with regard to the structure of the housing 21 manufactured by the manufacturing apparatus 2000 provided in the foregoing embodiments, reference may be made to the housing 21 provided in the foregoing embodiments, and details are not described herein again.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
The above embodiments are merely for illustrating the technical solutions of the present application and are not intended to limit the present application, and those skilled in the art can make various modifications and variations of the present application. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (18)
1. A case for housing an electrode assembly, comprising:
a peripheral wall extending in a first direction and surrounding an outside of the electrode assembly;
a pressure relief groove provided in the peripheral wall, the peripheral wall configured to split along the pressure relief groove to relieve pressure inside the housing when the pressure or temperature inside the housing reaches a threshold value;
wherein the length of the peripheral wall along the first direction is L 1 A distance L between the end portion and the pressure relief groove adjacent to the end portion of the peripheral wall 2 Satisfies the following conditions: l is 2 ≤L 1 /3。
2. The housing of claim 1, wherein L is 300mm ≦ L 1 When less than or equal to 600mm, L 2 ≤100mm。
3. The enclosure of claim 1, wherein said perimeter wall is provided with at least one pressure relief groove set comprising a plurality of said pressure relief grooves spaced circumferentially along said perimeter wall.
4. The enclosure of claim 3, wherein the at least one pressure relief slot set comprises a first pressure relief slot set and a second pressure relief slot set;
along the first direction, the first pressure relief groove group and the second pressure relief groove group are arranged on the peripheral wall at intervals, and the pressure relief grooves in the first pressure relief groove group and the pressure relief grooves in the second pressure relief groove group are respectively close to two ends of the peripheral wall.
5. The enclosure of claim 4, wherein the at least one pressure relief slot set further comprises a third pressure relief slot set, the third pressure relief slot set being located between the first and second pressure relief slot sets in the first direction.
6. The enclosure of claim 5, wherein said third set of pressure relief grooves is located midway along said perimeter wall in said first direction.
7. The housing of claim 4, wherein 300mm ≦ L 1 ≤600mm。
8. A casing according to any one of claims 1 to 7, wherein the peripheral wall has a relief portion, the relief groove defining the relief portion, the relief portion being configured to flip open outwardly to relieve pressure inside the casing when the pressure or temperature inside the casing reaches a threshold value.
9. The housing of claim 8, wherein the pressure relief groove comprises a first groove portion, a second groove portion and a third groove portion, the first groove portion and the third groove portion are disposed opposite to each other along the first direction, and the first groove portion, the second groove portion and the third groove portion are sequentially connected to define the pressure relief portion.
10. The housing of claim 9, wherein the second slot portion comprises a linear slot segment extending along the first direction, the linear slot segment having a length L 3 The residual thickness of the peripheral wall at the position of the linear groove section is H, and the requirements are as follows: 1/5H +1/2L 3 ＞0.55。
11. The housing of claim 10, wherein L is 3 ≤10mm，H≤0.4mm。
12. The enclosure of claim 10, wherein the second slot portion further comprises a first rounded chamfer segment configured to connect the first slot portion and the linear slot segment and a second rounded chamfer segment configured to connect the second slot portion and the linear slot segment.
13. The housing of claim 12, wherein the radius R of the first radiused chamfered segment 1 Less than or equal to 5 mm; and/or the radius R of the second arc chamfer segment 2 ≤5mm。
14. A casing according to any one of claims 1 to 7, wherein the peripheral wall is cylindrical.
15. A casing according to any one of claims 1 to 7, wherein the pressure relief groove is provided in an outer surface of the peripheral wall.
16. A battery cell, comprising:
an electrode assembly;
the can of any one of claims 1-15, for housing the electrode assembly.
17. A battery, comprising:
the battery cell of claim 16;
and the box body is used for accommodating the battery monomer.
18. An electrical device comprising the battery of claim 17.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220429503.0U CN217158424U (en) | 2022-02-28 | 2022-02-28 | Shell, battery monomer, battery and consumer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220429503.0U CN217158424U (en) | 2022-02-28 | 2022-02-28 | Shell, battery monomer, battery and consumer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115939656A (en) * | 2022-09-20 | 2023-04-07 | 宁德时代新能源科技股份有限公司 | Shell, battery monomer, battery and consumer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115939656A (en) * | 2022-09-20 | 2023-04-07 | 宁德时代新能源科技股份有限公司 | Shell, battery monomer, battery and consumer |
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