CN213026310U - Battery box, battery monomer, battery and consumer - Google Patents
Battery box, battery monomer, battery and consumer Download PDFInfo
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- CN213026310U CN213026310U CN202021358538.7U CN202021358538U CN213026310U CN 213026310 U CN213026310 U CN 213026310U CN 202021358538 U CN202021358538 U CN 202021358538U CN 213026310 U CN213026310 U CN 213026310U
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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 application discloses battery case, battery monomer, battery and consumer. This battery case includes: electrode terminals disposed on the battery case; and a pressure relief area, the pressure relief area including a first groove disposed on an inner surface of the battery case and a second groove disposed on an outer surface of the battery case, the first groove being disposed opposite to the second groove, wherein a bottom wall of the first groove and/or a bottom wall of the second groove is provided with a third groove, the pressure relief area being configured to rupture at the third groove to relieve an internal pressure of the battery case when the internal pressure reaches a threshold value. The application discloses battery case, battery monomer, battery and consumer, the pressure release region that sets up on the battery case easily processes.
Description
Technical Field
The application relates to the field of energy storage components and parts, in particular to a battery box, a battery monomer, a battery and electric equipment.
Background
The lithium ion battery has the advantages of small volume, high energy density, long cycle service life, long storage time and the like, and is widely applied to the fields of electronic equipment, electric vehicles, electric toys and the like, for example, mobile phones, notebook computers, electric bicycles, electric automobiles, electric airplanes, electric ships, electric toy automobiles, electric toy ships, electric toy airplanes, electric tools and the like.
With the continuous development of lithium ion battery technology, higher requirements are also put forward on the safety performance of the lithium ion battery. The pressure relief mechanism on the lithium ion battery has an important influence on the safety performance of the lithium ion battery. For example, when the lithium ion battery is short-circuited or overcharged, thermal runaway inside the lithium ion battery may occur, and the internal air pressure may suddenly rise, and at this time, the pressure relief mechanism needs to be actuated to release the internal air pressure to the outside, so as to prevent the lithium ion battery from exploding. Therefore, the design of the pressure relief mechanism is extremely important.
SUMMERY OF THE UTILITY MODEL
The application provides a battery case, battery monomer, battery and consumer to improve the performance of battery.
According to a first aspect of the present application, there is provided a battery pack comprising: electrode terminals disposed on the battery case; the pressure relief area comprises a first groove and a second groove, the first groove is arranged on the inner surface of the battery box, the second groove is arranged on the outer surface of the battery box, the first groove and the second groove are oppositely arranged, the bottom wall of the first groove and/or the bottom wall of the second groove are/is provided with a third groove, and the pressure relief area is configured to be broken at the third groove to relieve the internal pressure when the internal pressure of the battery box reaches a threshold value.
The battery box of the embodiment of the application is provided with the pressure relief area, the pressure relief area comprises a first groove and a second groove which are respectively arranged on the inner surface and the outer surface of the battery box, and a third groove can be further arranged on the bottom wall of the third groove and/or the bottom wall of the second groove of the first groove, so that the thickness of the third groove in the pressure relief area is thinner than that of other areas of the battery box, and therefore, when thermal runaway occurs in a battery monomer, the battery box can be broken at the relatively weak third groove to release internal pressure; and, the pressure release region in this application embodiment compares in the mode of additionally installing pressure release mechanism on the battery case, and the course of working is simpler, for example, can set up first recess, second recess and third recess through the mode of punching press, and wherein, first recess and second recess set up relatively, specifically can adopt the mode of offset, two recesses of simultaneous processing, and the course of working convenient and fast, and the size and the shape of three recess etc. set up in a flexible way moreover, can adjust according to practical application.
In some embodiments, the third recess is disposed in a bottom wall of the second recess.
Considering that the first groove is provided at the inner surface of the battery case, if the third groove is provided at the bottom wall of the first groove, the electrolyte may accumulate in the third groove due to the presence of the electrolyte in the battery case, corroding the third groove, which may cause the pressure relief region to be ruptured prematurely at the third groove, so the third groove is generally provided at the bottom wall of the second groove at the outer surface, thereby preventing corrosion of the electrolyte.
In some embodiments, the thickness of the pressure relief area at the third groove is 0.16mm to 0.25 mm.
In some embodiments, the axis perpendicular to the bottom wall of the first groove is the same as the axis perpendicular to the bottom wall of the second groove.
That is to say, first recess and second recess are just to setting up, can make the relative symmetry of pressure release region structure like this, are favorable to realizing the directional rupture more accurate in pressure release region.
In some embodiments, the outer surface of the battery case has a protrusion and surrounds the second groove.
Considering that if the first groove and the second groove are processed by punching, there is generally a protrusion at the edge of the groove, which may affect the mounting of the electrode assembly inside if the protrusion is provided inside, the protrusion may be provided on the outer surface of the case.
In some embodiments, the protrusion protrudes to a height of 0.25mm to 1mm with respect to the outer surface of the battery case.
In some embodiments, the shape of the bottom wall of the first recess and/or the shape of the bottom wall of the second recess is elongated.
The elongated grooves are easier to process.
In some embodiments, the width of the bottom wall of the first groove and/or the width of the bottom wall of the second groove is 3mm to 6 mm.
In some embodiments, the area of the bottom wall of the first groove is 150mm2To 330mm2(ii) a And/or the area of the bottom wall of the second groove is 150mm2To 330mm2。
In some embodiments, the depth of the first groove with respect to the inner surface of the battery case is 0.4mm to 0.7 mm; and/or the depth of the second groove with respect to the outer surface of the battery case is 0.3mm to 0.6 mm.
In some embodiments, the bottom wall of the third recess is elongated in shape.
In some embodiments, the length of the third groove is 40mm to 100 mm.
In some embodiments, the first groove and/or the second groove is a ring-type groove.
In some embodiments, the area of the bottom wall of the first groove is 400mm2To 1000mm2(ii) a And/or the area of the bottom wall of the second groove is 600mm2To 1200mm2。
In some embodiments, the depth of the first groove with respect to the inner surface of the battery case is 1mm to 2 mm; and/or the depth of the second groove with respect to the outer surface of the battery case is 0.3mm to 0.6 mm.
In some embodiments, the bottom wall of the second groove is provided with a ring-shaped fourth groove, and the third groove is arranged on the bottom wall of the fourth groove.
In order to make the pressure relief area more easily broken when thermal runaway occurs inside the battery cell, the thickness of the third groove should be thinner, so that the third groove in the pressure relief area can be broken, and more accurate directional breaking and venting can be realized. A fourth groove is arranged in the second groove, and a third groove is arranged on the bottom wall of the fourth groove, so that a thinner third groove area is easier to obtain.
In some embodiments, the area of the bottom wall of the fourth groove is 200mm2To 800mm2。
In some embodiments, the battery pack further comprises: and the protection sheet is used for protecting the pressure relief area and is arranged on the outer surface of the battery box and covers the second groove.
In some embodiments, the protective sheet has a thickness of 0.1mm to 0.2 mm.
The protective sheet disposed at one side of the pressure relief region, which is away from the inside of the battery case, can protect the pressure relief region from the influence of external components.
The pressure relief area in the embodiment of the present application is formed by the groove, so in the case of disposing the protective sheet on the outer surface of the battery case and covering the second groove, there is a gap between the protective sheet and the pressure relief area. Like this, the pressure release is regional when the exhaust, and at the clearance between protection piece and the pressure release region, can guarantee that the pressure release region has certain open space to, also can prevent to lead to the fact wearing and tearing to the pressure release region when the protection piece laminating pressure release region, further protect the pressure release region.
In some embodiments, the battery pack comprises: the shell is a hollow cuboid, and one end of the shell is provided with an opening; and the cover plate covers the opening of the shell.
In some embodiments, the pressure relief area is located in a bottom wall of the housing, the bottom wall of the housing being a wall opposite the opening of the housing.
Considering that the electrode terminals are generally disposed on the cap plate of the battery case, if the pressure relief region is also disposed on the cap plate, the pressure relief region is ruptured when thermal runaway occurs inside the battery cell, and liquid or solid combustion products, which may also include conductive substances, are ejected outward while releasing the gas pressure inside the battery cell, thereby causing short circuit between the electrode terminals; meanwhile, considering that the electrode terminal is generally directed upward, i.e., toward the passenger when the battery is mounted in the vehicle, if the pressure relief region is mounted on the same side as the electrode terminal, substances such as air flow and the like released after the pressure relief region is ruptured may be discharged upward, which may cause burns or scalds to the passenger, increasing the risk to the passenger. Therefore, when the pressure relief area is arranged on the bottom wall of the shell, the pressure relief area exhausts air downwards, and the problem can be avoided.
In some embodiments, the bottom wall of the housing has a thickness of 1.2mm to 2 mm.
In some embodiments, the electrode terminals include a positive electrode terminal and a negative electrode terminal both disposed on the cap plate.
According to a second aspect of the present application, there is provided a battery cell including: a battery pack as described in the first aspect and any one of the possible implementations of the first aspect; and an electrode assembly disposed within the battery case.
In some embodiments, the battery pack comprises: the shell is a hollow cuboid, and one end of the shell is provided with an opening; and the cover plate covers the opening of the shell.
In some embodiments, the battery cell further includes: a backing plate located between the electrode assembly and the bottom wall of the case, the bottom wall of the case being a wall of the case opposite the opening of the case.
The backing plate can also protect the pressure relief area, and avoid the impact of an electrode assembly and electrode liquid in the battery box on the pressure relief area.
In some embodiments, the pressure relief area is located on the bottom wall of the housing, and the pad plate is provided with a through hole corresponding to the pressure relief area, so that the pad plate does not shield the pressure relief area.
When the pressure relief area is located the diapire, if the intensity in pressure relief area can guarantee that electrode subassembly and electrode solution do not lead to the fact destruction to it, then when battery monomer is inside to take place thermal runaway, consider that the backing plate can block gaseous burst pressure relief area, so in order to make the pressure relief area break more easily, can get rid of the subregion of backing plate to form and dodge the district, for example, can be in the position at the regional place of pressure relief, the corresponding through-hole that sets up on the backing plate, make the backing plate can not shelter from the pressure relief area.
According to a third aspect of the present application, there is provided a battery comprising: a plurality of battery cells including at least one battery cell as described in any one of the possible implementations of the second aspect and the second aspect; a bus member for electrically connecting the plurality of battery cells; a case for accommodating the plurality of battery cells and the bus bar member.
According to a fourth aspect of the present application, there is provided an electric device including: a battery as in the third aspect above.
The electric device can be a vehicle, a ship or a spacecraft.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
FIG. 1 is a schematic exterior view of some embodiments of a vehicle employing a battery of the present application;
fig. 2 is a schematic structural view of some embodiments of the battery of the present application;
FIG. 3 is a schematic structural view of some embodiments of a battery module in a battery of the present application;
fig. 4 is an exploded view of some embodiments of a battery cell of the present application;
FIG. 5 is a schematic view of some embodiments of a battery compartment of the present application having a pressure relief area;
fig. 6 is an exploded view of other embodiments of a battery cell of the present application;
FIG. 7 is a schematic view of some embodiments of the shim plate of the present application;
FIG. 8 is a cross-sectional view of some embodiments of the housing of the battery compartment of the present application;
FIG. 9 is an enlarged view of area A1 of FIG. 8;
fig. 10 is a bottom view of some embodiments of the housing of the battery compartment of the present application;
FIG. 11 is a cross-sectional view of some embodiments shown in FIG. 10;
FIG. 12 is an enlarged view of area A2 of FIG. 11;
FIG. 13 is a schematic flow chart of some embodiments of a method of making a battery case according to the present application;
fig. 14 is a schematic structural view of some embodiments of an apparatus for manufacturing a battery case according to the present application.
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 and completely 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 herein 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 herein 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 application. 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. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
The "plurality" in the present application means two or more (including two), and similarly, "plural" means two or more (including two) and "plural" means two or more (including two).
The battery pack, the battery cell, and the battery including a plurality of battery cells described in the embodiments of the present application are applicable to various devices using a battery, for example, mobile phones, portable devices, notebook computers, battery cars, electric cars, ships, spacecraft, electric toys, electric tools, and the like, for example, spacecraft including airplanes, rockets, space shuttle, spacecraft, and the like, electric toys including stationary or mobile electric toys, for example, game machines, electric car toys, electric ship toys, electric airplane toys, and the like, electric tools including metal cutting electric tools, grinding electric tools, assembly electric tools, and electric tools for railways, for example, electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planes.
The battery box, the battery cell and the battery including a plurality of battery cells described in the embodiments of the present application are not only limited to be applied to the above-described devices, but also applicable to all devices using batteries.
For example, as shown in fig. 1, which is a schematic structural diagram of a vehicle 1 according to an embodiment of the present disclosure, the vehicle 1 may be a fuel automobile, a gas automobile, or a new energy automobile, and the new energy automobile may be a pure electric automobile, a hybrid electric automobile, or an extended range automobile. A battery 10 may be disposed inside the vehicle 1, and the battery 10 may be a battery pack or a battery module, for example, the battery 10 may be disposed at the bottom of the vehicle 1 or at the head or tail of the vehicle; the vehicle 1 may also be provided with a controller 30 and a motor 40 inside. The battery 10 may be used for supplying power to the vehicle 1, for example, the battery 10 may be used as an operating power source of the vehicle 1 for the circuitry of the vehicle 1, for example, for the power demand for operation during starting, navigation and running of the vehicle 1. In another embodiment of the present application, the battery 10 may be used not only as an operation power source of the vehicle 1 but also as a driving power source of the vehicle 1, instead of or in part replacing fuel or natural gas to provide driving power for the vehicle 1.
In order to meet different power requirements, the battery 10 may include one or more battery modules (or may also be referred to as a battery module), wherein the plurality of battery modules may be connected in series or in parallel or in a series-parallel manner, and the series-parallel manner refers to a mixture of series connection and parallel connection. For example, as shown in fig. 2, in a schematic structural diagram of a battery 10 according to another embodiment of the present disclosure, the battery 10 includes a first cover 111, a second cover 112 and a plurality of battery modules 11, wherein the shape of the first cover 111 and the second cover 112 may be determined according to the shape of the combination of the one or more battery modules 11, the first cover 111 and the second cover 112 each have an opening, for example, each of the first cover 111 and the second cover 112 may be a hollow rectangular parallelepiped and only one surface of each cover is an open surface, that is, the surface does not have a housing wall so that the inside and the outside of the housing communicate, the first cover 111 and the second cover 112 are fastened to each other at the opening to form a closed housing of the battery 10, and the one or more battery modules 11 are connected to each other in parallel or in series-series combination and then placed in the housing formed by fastening the first cover 111 and the second cover 112.
In another embodiment of the present application, when the battery 10 includes one battery module 11, the battery module 11 is disposed in a housing formed by fastening the first cover 111 and the second cover 112.
Electricity generated by the one or more battery modules 11 is drawn through the housing by conductive means (not shown).
In addition, the battery 10 may include other structures, which are not described in detail herein. For example, the battery 10 may further include a bus member for achieving electrical connection between a plurality of battery cells (not shown); for another example, the battery 10 may further include a cooling component for accommodating a cooling medium to cool the one or more battery modules 11, but the embodiment of the present application is not limited thereto.
According to different power requirements, the battery module 11 may include one or more battery cells, for example, as shown in fig. 3, one battery module 11 may include a plurality of battery cells 20, the plurality of battery cells 20 may be connected in series, parallel or series-parallel to achieve larger capacity or power, and the number of the battery cells 20 included in one battery module 11 may be set to any number. Each of the battery cells 20 may include, but is not limited to, a lithium ion secondary battery, a lithium ion primary battery, a lithium sulfur battery, a sodium lithium ion battery, or a magnesium ion battery. The battery cell 20 may be cylindrical, flat, rectangular parallelepiped, or other shape.
In another embodiment of the present application, a plurality of battery cells 20 may be stacked together, and the plurality of battery cells 20 are connected in series, in parallel, or in series-parallel, and in another embodiment of the present application, each battery cell 20 may have a square shape, a cylindrical shape, or other shapes.
For each battery cell 20, a battery case and an electrode assembly disposed in the battery case may be included, wherein the battery case may include a case body and a cover plate, the case body may be a hollow rectangular parallelepiped, a cube or a cylinder, and one of the faces of the case body has an opening so that the electrode assembly may be placed in the case body; the cover plate is connected to the case at the opening of the case to form a closed battery case of the battery cell 20, and the case may be filled with an electrolyte.
In addition, the battery case further includes two electrode terminals, which are generally disposed on the cap plate and connected to the electrode assembly; the flat plate surface of the cover plate can be also provided with a pressure relief mechanism, and the pressure relief mechanism can be a part of the flat plate surface of the cover plate and can also be welded with the flat plate surface of the cover plate. Under normal conditions, the pressure relief mechanism is combined with the cover plate in a sealing mode, namely the cover plate is arranged at the opening of the shell and connected with the shell to form a battery box of the single battery 20, and the space formed by the battery box is sealed and airtight. When the gas that battery monomer 20 produced is too much, when gaseous inflation took place to make the atmospheric pressure rise in the battery box to surpass the default, the pressure release mechanism can be located to split and lead to the inside and outside intercommunication in the battery box, and gaseous outside release through the split department of pressure release mechanism, and then avoid taking place the explosion.
In the conventional single battery, a pressure relief mechanism is usually arranged on a cover plate and is positioned on the same side with an electrode terminal, when thermal runaway occurs in the single battery, the pressure relief mechanism is broken, liquid or solid comburent can be ejected outwards while air pressure in the single battery is released, and a conductive substance can be included, so that short circuit between the electrode terminals can be caused; meanwhile, considering that the electrode terminal is generally directed upward, that is, toward the passenger when the battery is mounted in the vehicle, if the pressure relief mechanism is mounted on the same side as the electrode terminal, substances such as air flow and the like released after the pressure relief mechanism is ruptured may be discharged upward, which may cause burns or scalds to the passenger, increasing the risk to the passenger. Therefore, it is conceivable to mount the pressure relief mechanism at another location to solve the above problem, for example, on the housing under the cover plate, such as the bottom wall of the housing.
However, if the pressure relief mechanism is mounted on the housing, since the housing is a hollow structure with an opening at one end and the pressure relief mechanism is generally in a sheet shape, there may be a problem that the mounting of the pressure relief mechanism on the housing is inconvenient, especially when the pressure relief mechanism is mounted on the bottom wall of the housing, it is difficult to weld the sheet pressure relief mechanism directly on the bottom wall due to the limitation of the depth of the housing. Accordingly, embodiments of the present application provide a battery cartridge having a pressure relief area, which can solve the above-mentioned problems.
Specifically, still taking the embodiment shown in fig. 1-3 as an example, fig. 4 shows another embodiment of the battery cell 20 of the embodiment of the present application. As shown in fig. 4, the battery cell 20 includes a battery case (not shown), which includes a case 211 and a cap plate 212 in the present embodiment, one or more electrode assemblies 22, and a connection member 23.
Specifically, as shown in fig. 4, the battery case of the battery cell 20 may include a case 211 according to the shape of one or more electrode assemblies 22 combined, for example, the case 211 may be a hollow rectangular parallelepiped, a cube, or a cylinder, and one of the faces of the case 211 has an opening so that one or more electrode assemblies 22 can be placed in the case 211, for example, when the case 211 is a hollow rectangular parallelepiped or a cube, one of the planes of the case 211 is an open face, i.e., the plane has no case wall to allow the inside and the outside of the case 211 to communicate with each other, and when the case 211 may be a hollow cylinder, the circular side of the case 211 is an open face, i.e., the circular side has no case wall to allow the inside and the outside of the case 211 to communicate with each other. The cover plate 212 is connected to the case 211 at an opening of the case 211 to form a closed battery case, and the case 211 is filled with an electrolyte.
As shown in fig. 4, the battery case of the battery cell 20 may further include two electrode terminals 214, and the two electrode terminals 214 may be provided on the cap plate 212. The cap plate 212 is generally in a plate shape, two electrode terminals 214 are disposed on and penetrate through the plate surface of the cap plate 212, the two electrode terminals 214 are a positive electrode terminal 214a and a negative electrode terminal 214b, respectively, and each electrode terminal 214 is provided with a connecting member 23, which may also be referred to as a current collecting member 23 or a copper-aluminum adaptor 23, disposed between the cap plate 212 and the electrode assembly 22.
As shown in fig. 4, each electrode assembly 22 may specifically include at least one positive electrode tab 221 and at least one negative electrode tab 222, and in addition, the electrode assembly 22 may further include a bare cell and an insulating sheet wrapping the bare cell, where the specific positions of the positive electrode tab 221 and the negative electrode tab 222 are not distinguished in fig. 4. The positive electrode tab 221 of the one or more electrode assemblies 22 is connected to one electrode terminal through one connecting member 23, and the negative electrode tab 222 of the one or more electrode assemblies 22 is connected to another electrode terminal through another connecting member 23, for example, the positive electrode terminal 214a is connected to the positive electrode tab 221 through one connecting member 23, and the negative electrode terminal 214b is connected to the negative electrode tab 222 through another connecting member 23.
In the battery cell 20, the electrode assembly 22 may be provided singly or in plurality according to actual use requirements, and as shown in fig. 4, at least two independent electrode assemblies 22 are provided in the battery cell 20.
In the battery cell 20, the electrode assembly 22 may have a winding structure or a laminated structure, and the embodiment of the present application is not limited thereto.
In addition, as shown in fig. 4, the battery cell 20 may further include a backing plate 24, where the backing plate 24 is located between the electrode assembly 22 and the bottom wall of the case 211, and may support the electrode assembly 22 and effectively prevent the electrode assembly 22 from interfering with the rounded corners around the bottom wall of the case 211. The shape of the backing plate 24 in the embodiment of the present application may be set according to practical applications, for example, the backing plate 24 may be set to be rectangular in shape corresponding to the bottom wall of the housing 211, or, as shown in fig. 4, may be set to be other shapes; in addition, the backing plate 24 may be provided with one or more through-holes, for example, a plurality of through-holes may be provided in a uniform or symmetrical arrangement, so that the spaces of the upper and lower surfaces of the backing plate 24 are communicated, and the electrolyte and the gas generated inside the electrode assembly 22 and the electrolyte can freely pass through the backing plate 24, thereby facilitating the conduction of the liquid and the gas.
The thickness of the backing plate 24 is generally set to 0.3 to 5mm, and preferably, it is an insulating member, but it may not be insulating. For example, the material of the backing plate 24 may be electrolyte-resistant and insulating materials such as PP, PE, PET, PPs, teflon, stainless steel, and aluminum, wherein the plastic materials such as PP, PE, PET, and PPs may be fire-resistant materials, and the surfaces of the metal materials such as aluminum or stainless steel may be anodized and insulated.
In addition, the battery cell 20 in the embodiment of the present application may include other components. For example, the battery cell 20 may further include at least one of a cap patch, a sealing nail, and a plastic nail, wherein the cap patch, the sealing nail, and the plastic nail may be mounted on the cover plate 212; in addition, the battery cell 20 may further include a blue film disposed on an outer surface of the battery case 211 to insulate and protect the battery cell. The embodiments of the present application are not limited thereto.
In the embodiment of the present application, the case 211 or the cover 212 of the battery box may further have a pressure relief area, for example, the bottom wall of the case 211 in fig. 4 may have the pressure relief area. Specifically, taking fig. 5 as an example, fig. 5 shows a schematic diagram of the battery box 21, and in the embodiment of the present application, the battery box 21 in fig. 5 includes a housing 211 and a cover 212 as shown in fig. 4. As shown in fig. 5, a rectangular parallelepiped (i.e., hexahedral) battery case 21 is taken as an example, then the battery case 21 includes six walls (or six faces), fig. 5 shows three adjacent walls of the battery case 21, and the pressure relief area 213 in the embodiment of the present application may be provided on any one wall of the battery case 21. For example, the pressure relief region 213 may be disposed on a bottom wall of the case 211 of the battery cartridge 21, the bottom wall of the case 211 being opposite to the opening of the case 211, i.e., a wall of the battery cartridge 21 provided with the pressure relief region 213 represents the bottom wall of the case 211 in fig. 5; for another example, as shown in fig. 6, the pressure relief area 213 may be disposed on any one side wall of the housing 211, but the embodiment of the present invention is not limited thereto. The pressure relief region 213 in the embodiment of the present application is used to activate to relieve the internal pressure of the battery box 21 when the internal pressure reaches a threshold value.
In the embodiment of the present application, the battery case 21 is a rectangular parallelepiped, the case 211 has 4 side walls, two side walls with a larger area and two side walls with a smaller area, and in the case where the pressure relief region 213 is provided on the side wall of the case 211, the pressure relief region 213 is generally provided on the side wall with the smaller area, for example, as shown in fig. 6. Considering that when a plurality of battery cells are assembled into a battery, for example, as shown in fig. 3, for a rectangular battery cell, the adjacent two battery cells are usually placed in a state where the walls with larger areas of the side walls of the housing of the two battery cells are in contact with each other, if the pressure relief region 213 is disposed on the side wall with larger area, and when the plurality of battery cells are tightly discharged to assemble into a battery, the opening of the pressure relief region 213 is affected, for example, a space for opening the pressure relief region 213 needs to be left between the battery cells, which is not beneficial to the installation of the plurality of battery cells, so that the pressure relief region 213 is mounted on the side wall with smaller area, which is beneficial to the placement between the plurality of battery cells, and further can improve the energy density of the battery.
In the case where the pressure relief region 213 is disposed on the bottom wall of the case 211, considering the pressure of the internal electrode assembly 22 on the pressure relief region 213, for example, in the case of a battery mounted inside a vehicle, which may bump during the driving of the vehicle, the electrode assembly 22 and the electrolyte may impact the side wall and the bottom wall of the case 211, and the pressure relief region 213 is thinner than the other regions of the bottom wall of the case, so that the pad 24 disposed between the electrode assembly 22 and the bottom wall of the case 211 as shown in fig. 4 may buffer the pressure relief region 213 below, so as to prevent the electrolyte and the electrode assembly 22 from impacting the pressure relief region 213 and causing the pressure relief region 213 to rupture.
On the other hand, the pad 24 on the bottom wall covers the pressure relief area 213, and the pad 24 may block the air from breaking through the pressure relief area 213 while protecting the pressure relief area 213, so that an avoidance area may be disposed on the pad 24 to ensure that the pad does not block the pressure relief area 213, that is, whether the avoidance area is disposed on the pad 24 may be selected according to the thickness, strength, and other factors of the pressure relief area 213 in practical application.
Specifically, for the case that the backing plate 24 is provided with an avoidance area to ensure that the backing plate does not block the pressure relief area 213, as shown in fig. 7, a rectangular backing plate 24 is taken as an example for description here, and a partial area of the backing plate 24 may be removed, that is, a through hole is correspondingly provided as the avoidance area 241 on the backing plate 24 at the position of the pressure relief area 213, so that the backing plate 24 does not block the pressure relief area. The shape of the relief area 241 on the pad 24 generally corresponds to the shape of the side surface of the pressure relief area 213 close to the inside of the housing 211, and fig. 7 is only an example, and the embodiment of the present invention is not limited thereto.
In order to prevent the pad 24 from blocking the pressure relief region 213, the area of the escape area 241 of the pad 24 is usually set to be larger than the area of the pressure relief region 213; alternatively, it is considered that the pressure relief region 213 in the embodiment of the present application is disposed in the through hole of the bottom wall of the housing 211, and thus the area of the relief region 241 of the pad 24 is larger than that of the through hole of the bottom wall of the housing 211, but the embodiment of the present application is not limited thereto.
The pressure relief area 213 in the embodiment of the present application will be described in detail below with reference to the drawings. Specifically, the pressure relief area 213 is provided on the bottom wall of the housing 211. FIG. 8 illustrates a cross-sectional view of the housing 211 in an embodiment of the present application, for example, the cross-sectional view may show a surface that passes through the pressure relief region 213 and is parallel to a smaller area sidewall of the housing 211; fig. 9 is an enlarged view of an area a1 in fig. 8, and the area a1 includes a pressure relief area 213 therein, wherein the upper side in fig. 9 corresponds to the inside of the housing 211, and the lower side in fig. 9 corresponds to the outside of the housing 211. Specifically, as shown in fig. 9, the pressure relief area 213 in the embodiment of the present application may include a first groove 2131 disposed on an inner surface of the case 211 of the battery case 21 and a second groove 2132 disposed on an outer surface of the case 211 of the battery case 21, the first groove 2131 being disposed opposite to the second groove 2132, wherein a bottom wall of the first groove 2131 and/or a bottom wall of the second groove 2132 is provided with a third groove 2133, and the pressure relief area 213 is configured to rupture at the third groove 2133 to relieve an internal pressure of the battery case 21 when the internal pressure reaches a threshold value.
Thus, in the event of thermal runaway occurring inside the battery cell, the battery case 21 may be ruptured at the relatively weak third recess 2133 to release the internal pressure; moreover, compared with a mode of additionally installing a pressure relief mechanism on the battery box 21, the pressure relief area 213 in the embodiment of the present application has a simpler processing process, for example, the first groove 2131, the second groove 2132 and the third groove 2133 may be arranged in a stamping manner, wherein the first groove 2131 and the second groove 2132 are arranged oppositely, specifically, a counter-stamping manner may be adopted, two grooves are processed simultaneously, the processing process is convenient and fast, and the size, shape and the like of the three grooves are flexibly arranged, and can be adjusted according to practical application; moreover, the material that casing 211 adopted is metal aluminium usually, and the material of this pressure release region 213 is aluminium likewise, compares in the pressure release mechanism of the other materials of extra setting, and the pressure release region 213 in this application embodiment is easier to process, also opens in time when battery case 21 is inside to take place thermal runaway easily for it is more smooth and easy to exhaust, and exhaust rate is high.
In addition, considering that the electrode terminals 214 are generally disposed on the cap plate 212 of the battery case 21, if the pressure relief region 213 is also disposed on the cap plate 212, the pressure relief region 213 is ruptured when thermal runaway occurs inside the battery cell 20, and liquid or solid combustion products, which may also include conductive substances, are ejected outward while releasing the gas pressure inside the battery cell 20, which may cause a short circuit between the electrode terminals 214; meanwhile, considering that the electrode terminal 214 is generally directed upward, i.e., toward the passenger when the battery is mounted in the vehicle, if the pressure relief region 213 is mounted on the same side as the electrode terminal 214, the air flow or the like released after the pressure relief region 213 is ruptured may be discharged upward, which may cause burns or scalds to the passenger, increasing the risk to the passenger. Therefore, the pressure relief area 213 of the embodiment of the present application can be flexibly selected to be disposed on the bottom wall or the side wall of the case 211 of the battery case 21, and is not limited by the processing method.
In the present embodiment, the third grooves 2133 may be provided in the bottom wall of the first groove 2131 and/or the bottom wall of the second groove 2132, but considering that the first groove 2131 is provided in the inner surface of the battery case 21, if the third grooves 2133 are provided in the bottom wall of the first groove 2131, since the electrolyte is present in the battery case 21, the electrolyte may accumulate in the third grooves 2133, corrode a portion of the third grooves 2133, which may cause the pressure relief area 213 to be broken in advance at the third grooves 2133, and therefore the third grooves 2133 are generally provided in the bottom wall of the second groove 2132 located in the outer surface, thereby preventing the corrosion of the electrolyte. The third recess 2133 is provided in the bottom wall of the second recess 2132 as an example.
It should be understood that the positions of the first and second grooves 2131 and 2132 in the embodiments of the present application are opposite, or the positions of the first and second grooves 2131 and 2132 are opposite in a direction perpendicular to the pressure relief area. For example, the projection of the second groove 2132 on the inner surface of the battery case 21 where the first groove 2131 is located and the projection of the bottom wall of the first groove 2131 on the inner surface at least partially overlap each other. For example, the first and second grooves 2131 and 2132 are described as being disposed opposite to each other, that is, the axis perpendicular to the bottom wall of the first groove 2131 is the same as the axis perpendicular to the bottom wall of the second groove 2132.
The shape of the bottom walls of the first and second recesses 2131 and 2132 included in the pressure relief area 213 in the embodiment of the present application may be set according to the actual application, and the shape of the bottom wall of the first recess 2131 and the shape of the bottom wall of the second recess 2132 may be the same or different. For convenience of description, the bottom wall of the first recess 2131 and the bottom wall of the second recess 2132 are the same in shape, for example, and will be described below. Wherein the shape of the bottom wall of the first recess 2131 and the shape of the bottom wall of the second recess 2132 may be rectangular, circular, oval or annular, as will be described in detail below in connection with both embodiments.
Alternatively, as a first embodiment, as shown in fig. 8 and 9, the shape of the bottom wall of the first groove 2131 and the shape of the bottom wall of the second groove 2132 may be annular, for example, may be annular such as square ring, circular ring or other shapes, for example, here, a racetrack-shaped ring as shown in fig. 5 is taken as an example, wherein the racetrack-shaped ring is similar to an ellipse, and both ends are circular arcs, but the middle is linear, but the embodiment of the present application is not limited thereto.
As shown in fig. 9, providing the third recess 2133 on the bottom wall of the second recess 2132 may include, for ease of processing: the bottom wall of the second groove 2132 is provided with a fourth groove 2134, and the third groove 2133 is provided with a bottom wall of the fourth groove 2134. However, the bottom wall of the fourth recess 2134 may be in a ring shape, which is consistent with the bottom wall of the second recess 2132, considering that the bottom wall of the second recess 2132 is in a ring shape, but the embodiment of the present invention is not limited thereto.
As shown in fig. 9, the shape of the cross section shown in fig. 9 of the first groove 2131, the second groove 2132, the third groove 2133 and the fourth groove 2134 in the embodiment of the present application may be set according to practical applications, for example, as for the angle formed by the bottom wall and the side wall of the groove, the groove may be a right-angle groove as shown in fig. 9 of the second groove 2132 and the fourth groove 2134, or an inclined groove as shown in fig. 9 of the first groove 2131 and the third groove 2133, but the embodiment of the present application is not limited thereto.
As shown in fig. 9, since the first recess 2131 and the second recess 2132 are ring-shaped recesses, there is a protrusion structure in the central area, and the protrusion structure 2136 close to the inside of the housing 211 is taken as an example for explanation. The protrusion 2136 is an annular middle area of the first groove 2131, and a surface of the protrusion 2136 close to the shell 211 may not protrude from an inner surface of the shell 211 except the pressure relief area 213, for example, the surface of the protrusion 2136 close to the shell 211 may be substantially flush with the inner surface of the shell 211 except the pressure relief area 213, or, as shown in fig. 9, the surface of the protrusion 2136 close to the shell 211 may be recessed from the inner surface of the shell 211 except the pressure relief area 213, which is not limited in this embodiment of the application.
Meanwhile, the periphery of the first recess 2131 does not protrude with respect to the inner surface of the case 211, so that there is no protruding portion on the inner surface of the case 211, and when mounting components such as an electrode assembly inside the case 211, the protruding portion is not affected, and an additional design is not required to avoid the protruding portion, so that the internal space can be saved.
As shown in fig. 9, with respect to the outside of the housing 211, a protrusion 2137 may be further provided on the outer surface of the housing 211 around the second groove 2132, the protrusion 2137 extending in a direction away from the inside of the housing 211 with respect to the outer surface of the housing 211. Considering that if the first and second grooves 2131 and 2132 are punched, there is generally a protrusion at the edge of the groove, which, if provided inside, may interfere with the mounting of the electrode assembly inside, and thus, the protrusion 2137 may be provided on the outer surface of the case 211.
If the battery cell 20 is assembled into the battery 10, some component needs to be disposed below the battery cell 20, for example, a cooling plate may be disposed to cool the battery cell 20, or a bottom protection plate may be disposed. Due to the presence of the protrusion 2137, the battery cell 20 can be assembled by providing a recessed relief area on the surface of the component located below the battery cell 20. For example, if a cooling plate is disposed under the battery cell 20, a groove or a through hole may be provided in an area of the cooling plate corresponding to the pressure relief area 213, so that the protrusion 2137 protruding in the pressure relief area 213 may be received in the groove or the through hole, thereby saving space.
In addition, due to the protrusion 2137, a gap is formed between the surface of the pressure relief area 213 away from the inside of the housing 211 and the surface of a component (such as a cooling component or a bottom guard plate) below the pressure relief area 213, so that the pressure relief area 213 can have a certain opening space when exhausting, and the third groove 2133 of the pressure relief area 213 can be broken and opened to release the internal pressure.
As shown in fig. 9, in order to protect the side of the pressure relief area 213 away from the housing 211 from other components outside the battery case 21, the pressure relief area 213 may further include: a protective sheet 2135 for protecting the pressure relief area 213 is disposed on the outer surface of the battery case 21 and covers the second recess 2132.
It should be understood that the size of each part in the embodiments of the present application may be set according to the actual application. For example, the following is illustrated in conjunction with fig. 9.
For the size of the pressure relief region 213, the area of the bottom wall of the first groove may be set to 400mm in general2To 1000mm2For example, it may be set to 400mm2、700mm2Or 1000mm2(ii) a The area of the bottom wall of the second groove 2132 may be set to 600mm in general2To 1200mm2For example, it can be set to 600mm2、900mm2Or 1200mm2(ii) a The area of the bottom wall of the fourth groove 2134 may be set to be generally 200mm2To 800mm2For example, it may be set to 200mm2、500mm2Or 800mm2. Wherein, in the embodiment of the present application, "mm2"means square millimeters.
As shown in fig. 9, taking the example of disposing the pressure relief area 213 on the bottom wall of the housing 211, the thickness h1 of the bottom wall of the housing 211 may be generally set to 1.2mm to 2mm, for example, may be set to 1.2mm, 1.5mm, or 2 mm; the depth h2 of the first groove 2131 with respect to the inner surface of the battery case 21 may be set generally to 1mm to 2mm, for example, may be set to 1mm, 1.5mm, or 2 mm; the depth h3 of the second groove 2132 with respect to the outer surface of the battery case 21 is 0.3mm to 0.6mm, and may be set to 0.3mm, 0.4mm, or 0.6mm, for example; the thickness h4 between the bottom wall of the second groove 2132 to the bottom wall of the first groove 2131 may be set generally to 0.3mm to 1mm, for example, may be set to 0.3mm, 0.5mm, or 1 mm; the thickness h5 of the pressure relief area 213 at the third recess 2133 may be generally set to 0.16mm to 0.25mm, for example, may be set to 0.16mm, 0.2mm, or 0.25 mm. In the present embodiment, "mm" means millimeter.
As shown in fig. 9, with reference to the above-mentioned relative dimensions of the first recess 2131 and the second recess 2132, such as depth and bottom wall area, the height h6 of the projection 2137 relative to the outer surface of the battery case 21 may be set generally to 0.5mm to 1mm, for example, may be set to 0.5mm, 0.8mm or 1 m; in addition, the thickness h7 of the protective sheet 2135 may be set generally to 0.1mm to 0.2mm, and for example, may be set to 0.1mm, 0.15mm, or 0.2 mm.
Alternatively, as a second embodiment, the shape of the bottom wall of the first recess 2131 and the shape of the bottom wall of the second recess 2132 may be other shapes, for example, they may be rectangular, circular or racetrack, and here, it is taken as an example of being disposed in a strip shape, which means a special rectangle, that is, the length of the rectangle is much greater than the width, for example, it is still taken as an example that the pressure relief area 213 is located on the bottom wall of the housing 211, fig. 10 is a bottom view of the housing 211, and as shown in fig. 10, the second recess 2132 may be a strip shape. Similarly, the shape of the third recess 2133 in the embodiment of the present application may also be consistent with the shape of the first recess 2131 and the second recess 2132, which are also exemplified by the long bar shape.
Specifically, as shown in fig. 10, the pressure relief area 213 is elongated, that is, the length of the second groove 2132 of the pressure relief area 213 located on the outer surface of the bottom wall of the housing 211 is much greater than the width thereof, and the length of the third groove 2133 is also much greater than the width thereof, for example, taking the third groove 2133 as an example, the length L1 of the bottom wall of the third groove 2133 may be generally set to 40mm to 100mm, for example, 40mm, 70mm or 100mm, so that the elongated third groove 2133 has a larger length, a larger opening area, smoother air discharge, a higher air discharge rate, and less possibility of explosion.
Fig. 11 shows a cross-sectional view of the housing 211 in the embodiment of the present application, the upper side in fig. 11 corresponds to the opening of the housing 211, the lower side in fig. 11 is the bottom wall of the housing 211, and a pressure relief area 213 is provided on the bottom wall of the housing 211; fig. 12 is an enlarged view of an area a2 in fig. 11, and the area a2 includes a pressure relief area 213 therein, wherein the upper side in fig. 12 corresponds to the inside of the housing 211, and the lower side in fig. 12 corresponds to the outside of the housing 211. Specifically, as shown in fig. 12, similarly to fig. 9, the first groove 2131 is provided on the inner surface of the housing 211, the second groove 2132 is provided on the outer surface of the housing 211, and the third groove 2133 is provided on the bottom wall of the second groove 2132, and unlike fig. 9, the cross-sectional shape of the first groove 2131, the second groove 2132, and the third groove 2133 shown in fig. 12 is no longer a ring shape having a convex structure in the middle.
As for the shapes of the cross section shown in fig. 12 of the first groove 2131, the second groove 2132, and the third groove 2133 in the embodiment of the present application, fig. 12 exemplifies a rounded trapezoid, but other shapes may be provided according to practical applications. For example, the angle formed by the bottom wall and the side wall of each groove may be a right angle, i.e., the first groove 2131, the second groove 2132, and the third groove 2133 may be right-angled grooves; or, considering that the bottom walls of the first groove 2131, the second groove 2132 and the third groove 2133 are all in a long strip shape and are difficult to be processed into a right angle in the processing process, as shown in fig. 12, the first groove 2131, the second groove 2132 and the third groove 2133 may also be grooves with an inclined angle, so that the whole of the groove is in a trapezoid shape, for example, a rounded trapezoid shape in fig. 12, that is, the area of the bottom walls of the first groove 2131, the second groove 2132 and the third groove 2133 is smaller than that of the opening, but the embodiment of the present application is not limited thereto.
As shown in fig. 12, similarly to fig. 9, for the outside of the housing 211, there may be also provided a projection 2137 on the outer surface of the housing 211 around the second groove 2132, the projection 2137 extending in a direction away from the inside of the housing 211 with respect to the outer surface of the housing 211. For brevity, no further description is provided herein.
As shown in fig. 12, in order to protect the side of the pressure relief area 213 away from the housing 211 from other components outside the battery case 21, the pressure relief area 213 may further include, similar to the first embodiment: a protective sheet 2135 for protecting the pressure relief area 213 is disposed on the outer surface of the battery case 21 and covers the second recess 2132.
It should be understood that the size of each part in the embodiments of the present application may be set according to the actual application. For example, the following is illustrated in conjunction with fig. 12.
Regarding the size of the area of the pressure relief region 213, the area of the bottom wall of the second groove 2132 is generally set equal to the area of the bottom wall of the first groove, for example, the area of the bottom wall of the first groove may be generally set to 150mm2To 330mm2For example, it can be set to 150mm2、200mm2Or 330mm2(ii) a Bottom of the second recess 2132The area of the wall can also be set to 150mm in general2To 330mm2For example, it can be set to 150mm2、200mm2Or 330mm2. In addition, the width of the bottom wall of the first groove 2131 may be equal to the width of the bottom wall of the second groove 2132, for example, as shown in fig. 12, the width L2 of the bottom wall of the first groove 2131 may be equal to the width L2 of the bottom wall of the second groove 2132, may be set to 3mm to 6mm, for example, may be set to 3mm, 5mm, or 6 mm.
As shown in fig. 12, taking the example of disposing the pressure relief area 213 on the bottom wall of the housing 211, the thickness h11 of the bottom wall of the housing 211 may be generally set to 1.2mm to 2mm, for example, may be set to 1.2mm, 1.5mm, or 2 mm; the depth h12 of the first groove 2131 with respect to the inner surface of the battery case 21 may be set generally to 0.4mm to 0.7mm, for example, may be set to 0.4mm, 0.5mm, or 0.7 mm; the depth h13 of the second groove 2132 with respect to the outer surface of the battery case 21 is 0.3mm to 0.6mm, and may be set to 0.3mm, 0.5mm, or 0.6mm, for example; the thickness h14 of the pressure relief area 213 at the third recess 2133 may be generally set to 0.16mm to 0.25mm, for example, may be set to 0.16mm, 0.2mm, or 0.25 mm.
Referring to the above-mentioned relative dimensions of the first recess 2131 and the second recess 2132, such as depth and bottom wall area, as shown in fig. 12, the height h15 of the protrusion 2137 with respect to the outer surface of the battery case 21 may be set to be generally 0.25mm to 0.5mm, for example, may be set to be 0.25mm, 0.3mm or 0.5 mm; the thickness h16 of the protective sheet 2135 may be set generally to 0.1mm to 0.2mm, and for example, may be set to 0.1mm, 0.15mm, or 0.2 mm.
The battery case, the battery cell, and the battery according to the embodiment of the present application are described above with reference to fig. 1 to 12, and the method and apparatus for manufacturing the battery case according to the embodiment of the present application will be described below with reference to fig. 13 and 14.
Specifically, fig. 13 shows a schematic flow diagram of a method 200 of preparing a battery case according to an embodiment of the present application. As shown in fig. 13, the method 200 may include: s210, arranging a first groove on the inner surface of the battery box, and arranging a second groove on the outer surface of the battery box to form a pressure relief area of the battery box, wherein the first groove and the second groove are oppositely arranged; s220, providing a third groove at the bottom wall of the first groove and/or the bottom wall of the second groove, wherein the pressure relief area is configured to be broken at the third groove to relieve the internal pressure of the battery box when the internal pressure reaches a threshold value.
Optionally, as an embodiment, the outer surface of the battery case has a protrusion and surrounds the second groove.
Optionally, as an embodiment, a shape of a bottom wall of the first groove and/or a shape of a bottom wall of the third groove is a long strip.
Optionally, as an embodiment, the first groove and/or the second groove is a ring-shaped groove.
It should be understood that the method 200 of the present embodiment may be used to prepare the battery case 21 of the present embodiment, and therefore, for brevity, will not be described herein again.
It should be understood that, in the various embodiments of the present application, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.
Fig. 14 shows a schematic block diagram of an apparatus 300 for manufacturing a battery pack according to an embodiment of the present application. As shown in fig. 14, an apparatus 300 according to an embodiment of the present application includes: a setup module 310, the setup module 310 to: arranging a first groove on the inner surface of the battery box and arranging a second groove on the outer surface of the battery box to form a pressure relief area of the battery box, wherein the first groove and the second groove are oppositely arranged; a third groove is provided at a bottom wall of the first groove and/or a bottom wall of the second groove, and the pressure relief region is configured to rupture at the third groove to relieve an internal pressure of the battery case when the internal pressure reaches a threshold value.
Optionally, as an embodiment, the outer surface of the battery case has a protrusion and surrounds the second groove.
Optionally, as an embodiment, a shape of a bottom wall of the first groove and/or a shape of a bottom wall of the third groove is a long strip.
Optionally, as an embodiment, the first groove and/or the second groove is a ring-shaped groove.
It should be understood that the apparatus 300 according to the embodiment of the present application may correspond to performing the method 200 in the embodiment of the present application, and the above and other operations and/or functions of the respective units in the apparatus 300 are respectively for implementing the corresponding flows of the method 200 in fig. 13, and are not described herein again for brevity.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may be modified or some technical features may be equivalently replaced, but the modifications or the replacements do not cause the essence of the corresponding technical solutions to depart from the spirit and scope of the technical solutions of the embodiments of the present application.
Claims (15)
1. A battery pack, comprising
An electrode terminal (214) disposed on the battery case;
a pressure relief area (213), the pressure relief area (213) comprising a first groove (2131) provided at an inner surface of the battery case and a second groove (2132) provided at an outer surface of the battery case, the first groove (2131) being arranged opposite to the second groove (2132), wherein a bottom wall of the first groove (2131) and/or a bottom wall of the second groove (2132) is provided with a third groove (2133), the pressure relief area (213) being configured to rupture at the third groove (2133) to relieve an internal pressure of the battery case when the internal pressure reaches a threshold value.
2. The battery pack according to claim 1, wherein the third groove (2133) is provided at a bottom wall of the second groove (2132).
3. Battery compartment according to claim 1 or 2, characterized in that the axis perpendicular to the bottom wall of the first groove (2131) is the same as the axis perpendicular to the bottom wall of the second groove (2132).
4. A battery compartment according to claim 1 or 2, characterized in that the outer surface of the battery compartment has a protrusion (2137) and surrounds the second recess (2132).
5. Battery compartment according to claim 1 or 2, characterized in that the shape of the bottom wall of the first recess (2131) and/or the shape of the bottom wall of the second recess (2132) is elongated.
6. A battery compartment as claimed in claim 5, wherein the bottom wall of the third recess (2133) is elongate in shape.
7. Battery compartment according to claim 1 or 2, characterized in that the first recess (2131) and/or the second recess (2132) is a ring-shaped recess.
8. The battery pack according to claim 7, wherein a bottom wall of the second groove (2132) is provided with a ring-shaped fourth groove (2134), and the third groove (2133) is provided on a bottom wall of the fourth groove (2134).
9. A battery pack as claimed in claim 1 or 2, wherein said battery pack further comprises:
and a protective sheet (2135) for protecting the pressure relief area, disposed on an outer surface of the battery case, and covering the second recess (2132).
10. A battery cartridge as claimed in claim 1 or 2, characterized in that the battery cartridge comprises:
the shell (211) is a hollow cuboid, and one end of the shell (211) is provided with an opening;
a cover plate (212) for covering the opening of the housing (211),
wherein, the pressure relief area (213) is located at the bottom wall of the shell (211), and the bottom wall of the shell (211) is a wall opposite to the opening of the shell (211).
11. A battery cartridge as defined in claim 10, wherein said electrode terminals (214) include a positive electrode terminal (214a) and a negative electrode terminal (214b) both provided on said cap plate (212).
12. A battery cell, comprising:
a battery compartment according to any one of claims 1 to 11; and the number of the first and second groups,
an electrode assembly (22), the electrode assembly (22) being disposed within the battery case.
13. The battery cell of claim 12, wherein the battery case comprises:
the shell (211) is a hollow cuboid, and one end of the shell (211) is provided with an opening;
a cover plate (212) that covers the opening of the housing (211);
the battery cell further includes:
a gasket (24), the gasket (24) being located between the electrode assembly (22) and the bottom wall of the case (211), the bottom wall of the case (211) being a wall of the case (211) opposite to the opening of the case (211).
14. A battery, comprising:
a plurality of battery cells including at least one battery cell of claim 12 or 13;
a bus member for electrically connecting the plurality of battery cells;
a case for accommodating the plurality of battery cells and the bus bar member.
15. An electrical device, comprising: the battery of claim 14.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202021358538.7U CN213026310U (en) | 2020-07-10 | 2020-07-10 | Battery box, battery monomer, battery and consumer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021358538.7U CN213026310U (en) | 2020-07-10 | 2020-07-10 | Battery box, battery monomer, battery and consumer |
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| CN213026310U true CN213026310U (en) | 2021-04-20 |
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| WO2022252010A1 (en) * | 2021-05-31 | 2022-12-08 | 宁德时代新能源科技股份有限公司 | Battery cell, manufacturing method and manufacturing system therefor, battery, and power consuming device |
| WO2023056719A1 (en) * | 2021-10-09 | 2023-04-13 | 宁德时代新能源科技股份有限公司 | End cover, battery cell, battery, and power-consuming device |
| WO2023097469A1 (en) * | 2021-11-30 | 2023-06-08 | 宁德时代新能源科技股份有限公司 | Battery cell and manufacturing method and manufacturing system therefor, battery and electric device |
| WO2023155624A1 (en) * | 2022-02-21 | 2023-08-24 | 宁德时代新能源科技股份有限公司 | Battery and electric apparatus |
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| WO2023174266A1 (en) * | 2022-03-14 | 2023-09-21 | 宁德时代新能源科技股份有限公司 | Housing, battery cell, battery, and electrical device |
| WO2023240553A1 (en) * | 2022-06-16 | 2023-12-21 | 宁德时代新能源科技股份有限公司 | Battery cell, battery and electric device |
| WO2024145819A1 (en) * | 2023-01-04 | 2024-07-11 | 宁德时代新能源科技股份有限公司 | Case component, battery cell, battery, and electrical device |
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|---|---|---|---|---|
| WO2022252010A1 (en) * | 2021-05-31 | 2022-12-08 | 宁德时代新能源科技股份有限公司 | Battery cell, manufacturing method and manufacturing system therefor, battery, and power consuming device |
| EP4156398A4 (en) * | 2021-06-23 | 2023-08-30 | Contemporary Amperex Technology Co., Limited | Battery cell and manufacturing method and system therefor, battery, and electric device |
| WO2023056719A1 (en) * | 2021-10-09 | 2023-04-13 | 宁德时代新能源科技股份有限公司 | End cover, battery cell, battery, and power-consuming device |
| WO2023097469A1 (en) * | 2021-11-30 | 2023-06-08 | 宁德时代新能源科技股份有限公司 | Battery cell and manufacturing method and manufacturing system therefor, battery and electric device |
| WO2023155624A1 (en) * | 2022-02-21 | 2023-08-24 | 宁德时代新能源科技股份有限公司 | Battery and electric apparatus |
| WO2023174266A1 (en) * | 2022-03-14 | 2023-09-21 | 宁德时代新能源科技股份有限公司 | Housing, battery cell, battery, and electrical device |
| WO2023173428A1 (en) * | 2022-03-18 | 2023-09-21 | 宁德时代新能源科技股份有限公司 | Battery cell and manufacturing method and manufacturing apparatus therefor, battery, and power consuming apparatus |
| WO2023240553A1 (en) * | 2022-06-16 | 2023-12-21 | 宁德时代新能源科技股份有限公司 | Battery cell, battery and electric device |
| WO2024145819A1 (en) * | 2023-01-04 | 2024-07-11 | 宁德时代新能源科技股份有限公司 | Case component, battery cell, battery, and electrical device |
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