Battery monomer, battery device and power utilization device

Abstract

The embodiment of the utility model provides a battery monomer, a battery device and a power utilization device, the battery monomer comprises an end cover assembly, an electrode assembly and a shell, the shell comprises a shell body and a flange, the shell body is provided with an accommodating space, one side of the accommodating space along a first direction is opened to form a mounting port, the edge of the mounting port is provided with the flange, and the flange is arranged on the end cover assembly. The electrode assembly is located in the accommodating space; the end cover assembly blocks the installation opening and is connected with the shell, a part of the turned-over edge is located on at least one side of the end cover assembly in the first direction, the turned-over edge comprises third parts, at least part of two adjacent edges of the installation opening are provided with the third parts respectively, and the third parts extend in the length direction of the edges where the third parts are located and are connected with the third parts on the other adjacent edges. According to the battery monomer in the embodiment of the invention, when the battery monomer is in a thermal runaway state, the turnup can shield emissions to reduce the impact on the end cover assembly, or the turnup can support the end cover assembly to inhibit the movement of the end cover assembly, so that the probability that the end cover assembly is separated from the shell is reduced.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of battery technology, and specifically to a battery cell, a battery device, and an electrical device. Background Art

[0002] In the related art, a battery cell includes an end cap assembly and a shell, the shell is provided with a receiving space for receiving an electrode assembly, one side of the receiving space is open, and the end cap assembly is covered at the open position of the receiving space to seal the receiving space.

[0003] In the event of thermal runaway of the electrode assembly within the accommodation space, the generated emissions can be discharged from the battery cell through the pressure relief mechanism to reduce the probability of explosion of the battery cell.

[0004] When the exhaust gas is discharged from the pressure relief mechanism out of the accommodation space, the exhaust gas will also impact the end cover assembly, which may cause the problem of separation between the end cover assembly and the shell. Utility Model Content

[0005] In view of this, the embodiments of the present application hope to provide a battery cell, a battery device and an electrical device that can reduce the probability of separation of the end cap assembly from the shell in the event of thermal runaway.

[0006] To achieve the above purpose, the technical solution of the embodiment of the present application is implemented as follows:

[0007] The present application provides a battery cell, the battery cell comprising:

[0008] End cap assembly;

[0009] Electrode assembly;

[0010] A shell, comprising a shell body and a flange, wherein the shell body is provided with a receiving space, one side of the receiving space along a first direction is opened to form a mounting opening, an edge of the mounting opening is provided with the flange, and the electrode assembly is located in the receiving space;

[0011] The end cover assembly blocks the installation opening and is connected to the housing, and a portion of the flange is located on at least one side of the end cover assembly along the first direction;

[0012] The flange includes a third portion, and the third portion is respectively provided on at least two adjacent sides of the installation opening. The third portion extends along the length direction of the side where the third portion is located and is connected to the third portion on the other adjacent side.

[0013] For the battery cell in the embodiment of the present application, when the battery cell is in a state of thermal runaway, the flange can shield the emissions to reduce the impact of the emissions on the end cover assembly, or support the end cover assembly to inhibit the movement of the end cover assembly along the first direction, thereby helping to reduce the probability of separation of the end cover assembly from the shell, and helping to keep the emissions discharged from a predetermined area of ​​the battery cell. The third part further improves the structural connection strength of the two adjacent sides of the mounting port, and further reduces the risk of deformation and cracking of the two adjacent sides of the mounting port. On the other hand, the third part extends along its side to connect with another third part, which is also conducive to reducing the shielding of the mounting port by the third part, and improving the convenience of placing the electrode assembly through the mounting port.

[0014] In some embodiments, the installation opening is polygonal, and at least part of the flange is arranged on the long side of the polygon, which is helpful to suppress the tendency of the part of the shell body forming the long side to move relative to the end cover assembly and separate.

[0015] In some embodiments, the flange includes a first sub-edge, the first sub-edge is located on a side of the end cap assembly away from the installation opening along the first direction, and a side of the first sub-edge close to the end cap assembly abuts against the end cap assembly along the first direction. In this way, the first sub-edge can directly position the end cap assembly, reducing the risk of emissions generated by thermal runaway caused by leakage of the joint between the end cap assembly and the shell body due to the end cap assembly slipping relative to the shell body.

[0016] In some embodiments, the flange includes a first portion, the first portion extends along the extension direction of the side of the installation opening where the first portion is located, and the size of the first portion along the extension direction of the side where the first portion is located is equal to the size of the side. In this way, due to the increase in the size of the first portion, the effect of the first portion on shielding emissions from the end cap assembly or supporting the end cap assembly is improved, which is conducive to further reducing the probability of the end cap assembly separating from the shell after thermal runaway occurs in the battery cell.

[0017] In some embodiments, the flange includes a second portion, and the second portion is disposed on the long side of the mounting opening. Thus, disposing the second portion on the long side is conducive to suppressing the tendency of the partial structure of the shell body forming the long side to move relative to the end cover assembly and separate.

[0018] In some embodiments, each of the long sides is provided with the second portion, which is helpful to reduce the probability of the structure forming the long side of the shell body being separated from the end cover assembly under the impact of emissions generated by thermal runaway.

[0019] In some embodiments, in a projection plane perpendicular to the opening direction of the installation opening, the connection position of the two third parts is in an arc shape, which is conducive to reducing the risk of cracking between the connection positions of the two third sides due to stress concentration after being subjected to force.

[0020] In some embodiments, the radius of the arc at the connection position of the two third parts ranges from 2 mm to 3 mm. In this way, while maintaining the structural strength of the connection position of the two third parts to meet the requirements, it is beneficial to reduce the probability of interference between the connection position of the two third parts and the structures on the end cover assembly.

[0021] In some embodiments, at least one of the third parts is disposed on the long side of the installation opening. In this way, the third part on the side adjacent to the long side can additionally enhance the structural strength of the structure forming the long side of the installation opening, reducing the probability of deformation of the structure forming the long side of the installation opening of the housing body under the impact of emissions during thermal runaway.

[0022] In some embodiments, the flanging extends along the edge of the installation opening to surround the circumferential side of the installation opening. In this way, the circumferential side of the end cover assembly can be blocked by the flanging, further reducing the tendency of the end cover assembly to separate from the housing under the impact of emissions generated during thermal runaway.

[0023] In some embodiments, in the projection plane perpendicular to the first direction, the dimension of the flanging perpendicular to its own extension direction ranges from 1 mm to 10 mm. On the one hand, it is beneficial to stagger the joint position of the flanging and the end cover assembly relative to the joint position of the end cover assembly and the housing body, improving the blocking effect of the flanging on the end cover assembly; on the other hand, it is beneficial to reduce the probability of interference between the flanging and other structures on the end cover assembly.

[0024] In some embodiments, the flanging includes a second sub-edge, and the second sub-edge is located on the side of the end cover assembly close to the installation opening along the first direction, and the side of the end cover assembly close to the installation opening along the first direction is in contact with the second sub-edge. In this way, it is beneficial to reduce the probability of emissions generated during thermal runaway entering the joint between the second sub-edge and the end cover assembly and impacting the end cover assembly.

[0025] In some embodiments, the second sub-edge extends along the edge of the installation opening to surround the circumferential side of the installation opening. In this way, it is beneficial to block the impact of emissions flowing along the side wall of the installation space on the end cover assembly, reducing the probability of separation of the end cover assembly and the housing under the impact of emissions generated during thermal runaway.

[0026] In some embodiments, in the projection plane perpendicular to the first direction, the projection of the flanging is outside the projection range of the electrode assembly. In this way, it is beneficial to reduce the probability of interference between the electrode assembly and the flanging during the process of installing the electrode assembly into the installation space, improving the installation efficiency.

[0027] An embodiment of the present application further provides a battery device, which includes a box body and the battery cell described in any one of the foregoing embodiments. An installation space is provided in the box body, and the battery cell is disposed in the installation space. In this way, by providing a flanging, the risk of the battery cell in thermal runaway disintegrating in the installation space is reduced, and the risk of damage to other components in the battery device is reduced.

[0028] An embodiment of the present application further provides an electrical device, including the battery device of the foregoing embodiment. In this way, the risk of damage to other components in the electrical device caused by thermal runaway of the battery cell is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 Schematic diagram of an electrical device being a vehicle in an embodiment of the present application;

[0030] Figure 2 Schematic diagram of a battery device in an embodiment of the present application;

[0031] Figure 3 Schematic diagram of the explosion of a battery cell in the first embodiment of the present application;

[0032] Figure 4 For Figure 3 Schematic diagram of the embodiment in another perspective;

[0033] Figure 5 For Figure 4 Sectional view at the A-A position in;

[0034] Figure 6 Schematic diagram of the explosion of a battery cell in the second embodiment of the present application;

[0035] Figure 7 Schematic diagram of the explosion of a battery cell in the third embodiment of the present application;

[0036] Figure 8 For Figure 7 Sectional view of the embodiment in, the sectional position of which is the same as Figure 4 the A-A position in;

[0037] Figure 9 Schematic diagram of a battery cell in the fourth embodiment of the present application;

[0038] Figure 10 Schematic diagram of a battery cell in the sixth embodiment of the present application;

[0039] Figure 11 Schematic diagram of a battery cell in the seventh embodiment of the present application;

[0040] Figure 12 For Figure 11Explosion schematic diagram of the battery cell in

[0041] Figure 13 is Figure 11 Schematic diagram of the battery cell in from another perspective;

[0042] Figure 14 is Figure 13 Schematic diagram of the position B-B in .

[0043] Description of reference numerals

[0044] 1000, vehicle; 100, battery device; 200, controller; 300, motor; 10, box body; 11, first box body; 12, second box body; 20, battery cell; 21, end cover assembly; 211, pressure relief mechanism; 22, electrode assembly; 23, housing; 231, housing body; 231a, accommodation space; 231b, mounting opening; 231ba, long side; 231c, large surface; 232, flanging; 2321, first sub-edge; 2321a, first part; 2321b, second part; 2321c, third part; 2322, second sub-edge. Detailed implementation manners

[0045] It should be noted that, without conflict, the embodiments in the present application and the technical features in the embodiments can be combined with each other. The detailed description in the detailed implementation manners should be understood as an explanatory description of the purpose of the present application and should not be regarded as an improper limitation to the present application.

[0046] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and the above-mentioned drawings of this application are intended to cover non-exclusive inclusion.

[0047] In the description of the embodiments of this application, the technical terms "first", "second", "third", etc. are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of this application, "a plurality of" means more than two, unless otherwise specifically defined.

[0048] Referring to "embodiments" herein means that the specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The phrase appears in various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0049] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0050] In the description of the embodiments of the present application, for the convenience of explanation, as shown in the accompanying drawings of the specification, the direction of the arrow X is referred to as the “first direction”.

[0051] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0052] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense, and may be direct contact or contact through an intermediate medium layer. It may be contact with essentially no interaction force between the two contacting parties, or it may be contact with interaction force between the two contacting parties.

[0053] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0054] The battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiments of the present application.

[0055] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, which is arranged between the negative electrode and the positive electrode. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and released back and forth between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode to prevent the positive and negative electrodes from short-circuiting, while allowing active ions to pass through.

[0056] In some embodiments, the battery cell may include a housing. The housing may be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite housing), or an aluminum-plastic film, etc. In some embodiments, the housing may be a sealed structure or a non-sealed structure. As an example, when the housing is a non-sealed structure, the housing serves to protect the electrode assembly, and a sealed bag is further included between the housing and the electrode assembly, and the sealed bag is used to encapsulate the electrode assembly and the electrolyte. Specifically, the sealed bag may be a bag-shaped insulating member or an aluminum-plastic film. When the housing is a sealed structure, it is used to encapsulate components such as the electrode assembly and the electrolyte.

[0057] As an example, the battery cell may be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, a multi-prismatic battery, and the multi-prismatic battery is, for example, a hexagonal prism battery, etc. There is no particular limitation in this application.

[0058] In some embodiments, the housing includes an end cap and a housing body. The housing body is provided with an opening, and the end cap is disposed on the opening. The housing body may be provided with one or more openings. One or more end caps may also be provided.

[0059] In some embodiments, a pressure relief mechanism is provided on the housing. The pressure relief mechanism is used to discharge the internal gas of the battery cell.

[0060] As an example, it is actuated to release the internal pressure or temperature when the internal pressure or temperature of the battery cell reaches a predetermined threshold. When the internal pressure or temperature of the battery cell reaches a predetermined threshold, the pressure relief mechanism performs an action or a weak structure provided in the pressure relief mechanism is damaged, thereby forming an opening or a channel for releasing the internal pressure or temperature. This threshold design varies according to different design requirements. The threshold may depend on one or several materials among the positive electrode sheet, the negative electrode sheet, the electrolyte, and the separator in the battery cell.

[0061] As an example, the pressure relief mechanism may be integrally formed with the housing.

[0062] As an example, the pressure relief mechanism may also be separately provided and connected to the housing.

[0063] The "actuation" mentioned in this application means that the pressure relief mechanism generates an action or is activated to a certain state, so that the internal pressure and temperature of the battery cell can be released. The actions generated by the pressure relief mechanism may include, but are not limited to: the components in the pressure relief mechanism move to form an exhaust channel, at least a part of the pressure relief mechanism breaks, shatters, is torn, or opens, etc. When the pressure relief mechanism is actuated, the high-temperature and high-pressure substances inside the battery cell are discharged outward from the actuated part as emissions. In this way, the battery cell can be depressurized and cooled under controlled pressure or temperature, thereby avoiding potential more serious accidents.

[0064] In some embodiments, when the outer casing is a non-sealed structure, the pressure relief mechanism can be set as a through hole for discharging the gas inside the battery cell.

[0065] The emissions from the battery cell mentioned in this application include, but are not limited to: electrolytes, dissolved or fragmented positive and negative electrode plates, fragments of the separator, high-temperature and high-pressure gases generated by reactions, flames, and so on.

[0066] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include a plurality of battery cells, and the plurality of battery cells are connected in series, parallel, or in a hybrid connection through a busbar component.

[0067] In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells.

[0068] As an example, the battery cell assembly can be a battery module, and the battery module is formed by arranging and fixing a plurality of battery cells into an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells with cable ties.

[0069] In some embodiments, the battery apparatus can be a battery pack, and the battery pack includes a box body and one or more battery cell assemblies, and the battery cell assemblies are accommodated in the box body.

[0070] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be accommodated in the box body by fixing the battery module in the box body.

[0071] As an example, the battery cell assembly can also be accommodated in the box body by directly fixing a plurality of battery cells to the box body.

[0072] In some embodiments, the box body can be a part of the chassis structure of a vehicle. For example, a part of the box body can become at least a part of the floor of the vehicle, or a part of the box body can become at least a part of the crossbeam and longitudinal beam of the vehicle.

[0073] As an example, referring to Figure 2 , the box body 10 may include a first box body 11 and a second box body 12. The first box body 11 and the second box body 12 are buckled so that a closed space is formed inside the box body 10 to accommodate the battery cell assembly. The closed here means covered or closed, which can be sealed or non-sealed. The first box body 11 can be a top cover or a bottom plate.

[0074] As an example, the box body may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that a closed space is formed inside the box body to accommodate the battery cell assembly.

[0075] The technical solutions described in the embodiments of the present application are applicable to various electrical devices using battery cells, such as mobile phones, portable devices, laptop computers, battery cars, electric toys, electric tools, vehicles, ships, and spacecrafts, etc. For example, spacecrafts include airplanes, rockets, space shuttles, and spaceships, etc.

[0076] In the following embodiments, for the convenience of description, a vehicle 1000 of an embodiment of the present application is taken as an example for illustration. The following is described with reference to the drawings.

[0077] The vehicle 1000 can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc. As Figure 1 shown, a battery device 100 is disposed inside the vehicle 1000. The battery device 100 can be disposed at the bottom, head, or tail of the vehicle 1000. The battery device 100 can be used for power supply of the vehicle 1000. For example, the battery device 100 can be used as the operating power source of the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, for the working power requirements during the start, navigation, and driving of the vehicle 1000.

[0078] In some embodiments of the present application, the battery device 100 can not only be used as the operating power source of the vehicle 1000, but also be used as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0079] Next, the embodiments of the present application will be described in detail.

[0080] In the related art, a battery cell includes an end cap assembly and a housing. An installation space with one side open is provided in the housing. An electrode assembly and an electrolyte are disposed in the installation space. The end cap assembly seals the open position of the installation space so that the electrode assembly can be sealed in the installation space, thereby reducing the risk of electrolyte leakage in the installation space and foreign objects entering the installation space from the outside.

[0081] In the case of out-of-control of the electrode assembly, the generated emissions can impact the end cap assembly, resulting in damage to the connection between the end cap assembly and the housing. Furthermore, it may cause emissions to leak from the gap generated between the end cap assembly and the housing, and even may directly cause separation between the end cap assembly and the housing.

[0082] Based on the above technical problems, the present application aims to provide a battery cell, in which a flange is arranged at the open position of the installation space of the shell, and the flange is used to limit the end cover assembly, thereby suppressing the tendency of the end cover assembly to separate from the shell due to the impact of emissions when the battery cell suffers from thermal runaway.

[0083] Specifically, see Figures 3 to 5 , Figures 11 to 14 The battery cell 20 in the embodiment of the present application includes an end cover assembly 21 , an electrode assembly 22 and a shell 23 .

[0084] The shell 23 includes a shell body 231 and a flange 232. The shell body 231 is provided with a receiving space 231a. One side of the receiving space 231a along the first direction is open to form an installation opening 231b. The edge of the installation opening 231b is provided with a flange 232. The electrode assembly 22 is arranged in the receiving space 231a.

[0085] The end cover assembly 21 blocks the installation opening 231 b and is connected to the housing 23 , and a portion of the flange 232 is located on at least one side of the end cover assembly 21 along the first direction.

[0086] The flange 232 includes a third portion 2321c. At least two adjacent sides of the installation opening 231b are respectively provided with the third portion 2321c, and the two third portions 2321c are connected to each other.

[0087] The accommodation space 231a is used to place the electrode assembly 22 and the electrolyte.

[0088] During the assembly of the battery cell 20, the electrode assembly 22 is installed into the installation space through the installation port 231b, and then the installation port 231b is sealed by the end cover assembly 21 to isolate the installation space from the outside of the battery cell 20. The end cover assembly 21 can block the electrode assembly 22 so that the electrode assembly 22 will not leave the installation space from the installation port 231b.

[0089] The end cap assembly 21 is connected to the housing 23 so that the two are fixed. The specific connection method between the end cap assembly 21 and the housing 23 is not limited, for example, welding.

[0090] A portion of the flange 232 is located on at least one side of the end cover assembly 21 along the first direction, which means that a portion of the flange 232 may be located on a side of the end cover assembly 21 along the first direction close to the installation port 231b; a portion of the flange 232 may be located on a side of the end cover assembly 21 along the first direction away from the installation port 231b; or a portion of the flange 232 may be located on both sides of the end cover assembly 21 along the first direction.

[0091] It can be understood that the flange 232 is located on one side of the electrode assembly 22 along the first direction.

[0092] It can be understood that in a state where a thermal runaway occurs in the electrode assembly 22 within the accommodation space 231a, the generated emissions diffuse within the accommodation space 231a, and at least part of the emissions flow in the first direction and impact the end cap assembly 21.

[0093] When a part of the flanging 232 is located on the side of the end cap assembly 21 close to the mounting opening 231b along the first direction, the emissions will directly impact this part of the flanging 232 along the first direction first, and cannot impact the part of the end cap assembly 21 located on the other side of this part of the flanging 232; at the same time, the emissions can change their flow direction after hitting this part of the flanging 232, thereby reducing the probability that the subsequent emissions in this part directly impact other parts of the end cap assembly 21 along the first direction. Therefore, it is beneficial to reduce the force exerted on the end cap assembly 21 along the first direction.

[0094] When a part of the flanging 232 is located on the side of the end cap assembly 21 close to the mounting opening 231b along the first direction, this part of the flanging 232 can achieve a stop fit with the end cap assembly 21, thereby playing a role in suppressing the tendency of the end cap assembly 21 to move away from the mounting opening 231b under impact.

[0095] The third part 2321c is at least part of the flanging 232.

[0096] That is to say, among the two third parts 2321c, one third part 2321c is provided on one of the two adjacent sides of the mounting opening 231b, and the other third part 2321c is provided on the other one.

[0097] It can be understood that the connection position of the structures forming the two adjacent sides of the mounting opening 231b is prone to stress concentration under the impact of the emissions generated by the thermal runaway, and thus it is prone to separation from the end cap assembly 21 at this connection position.

[0098] Through the connection between the two third parts 2321c, it is beneficial to improve the connection strength of the structures forming the two adjacent sides of the mounting opening 231b, and reduce the risk of deformation and cracking of the two adjacent sides of the mounting opening 231b; the two third parts 2321c can strengthen each other and improve the ability to resist the impact of the emissions from the thermal runaway.

[0099] The two third parts 2321c are connected and completely cover the connection position of the two adjacent sides of the mounting opening 231b.

[0100] In the battery cell 20 according to the embodiment of the present application, in the state where the battery cell 20 undergoes thermal runaway, the flanging 232 can block the emissions to reduce the impact of the emissions on the end cap assembly 21, or support the end cap assembly 21 to inhibit the movement of the end cap assembly 21 in the first direction, thereby facilitating reducing the probability of the separation of the end cap assembly 21 from the housing 23 and enabling the emissions to be discharged from the established area of the battery cell 20; through the third part 2321c, the connection strength of the structures of the two adjacent sides of the mounting opening 231b is further improved, and the risk of deformation and cracking of the two adjacent sides of the mounting opening 231b is further reduced; on the other hand, the third part 2321c extends along its side to connect with another third part 2321c, which is also beneficial to reducing the blockage of the third part 2321c to the mounting opening 231b and improving the convenience of placing the electrode assembly 22 through the mounting opening 231b.

[0101] It can be understood that at least one of the end cap assembly 21 and the housing 23 is provided with a pressure relief mechanism 211. In the state where the battery cell 20 undergoes thermal runaway, the pressure relief mechanism 211 is opened so that the emissions can be discharged from the battery cell 20 through the pressure relief mechanism 211.

[0102] It can be understood that at least one of the housing body 231 and the flanging 232 is connected to the end cap assembly 21.

[0103] The specific shape of the mounting opening 231b is not limited. In the projection plane perpendicular to the first direction, the projection profile of the mounting opening 231b can be circular, elliptical, polygonal, kidney-shaped, etc.

[0104] In some embodiments, referring to Figure 3 and Figure 5 , the mounting opening 231b is polygonal, and at least a part of the flanging 232 is provided on the long side of the polygon.

[0105] The long side 231ba of the mounting opening 231b means that the mounting opening 231b has multiple sides, and the long side 231ba is the one with the largest length dimension among all the sides.

[0106] It can be understood that the part of the housing body 231 forming the long side 231ba of the mounting opening 231b, due to its large size, is subjected to a greater force under the impact of the emissions and is prone to deformation, and thus is prone to separation from the end cap assembly 21.

[0107] In this way, it is beneficial to inhibit the tendency of the part of the housing body 231 forming the long side 231ba to move relative to the end cap assembly 21 and separate.

[0108] Any one of the multiple sides of the projection profile of the mounting opening 231b can be a line segment or an arc segment.

[0109] It is understood that in some embodiments where the battery cell 20 is a square-shell battery cell, see Figure 3 The mounting opening 231b is rectangular.

[0110] In some embodiments, see Figure 4 and Figure 5 The flange 232 includes a first sub-edge 2321, and the first sub-edge 2321 is located on a side of the end cover assembly 21 away from the installation opening 231b along the first direction.

[0111] In this way, the first sub-edge 2321 can stop the movement of the end cover assembly 21 along the first direction away from the installation opening 231b, thereby reducing the probability that the end cover assembly 21 will be impacted by emissions and detached from the installation opening 231b in a thermal runaway state.

[0112] In some embodiments, see Figure 5 The first sub-edge 2321 , which is close to the end cover assembly 21 , abuts against the end cover assembly 21 along the first direction.

[0113] In this way, the first sub-edge 2321 can directly position the end cover assembly 21, thereby reducing the risk of emissions generated by thermal runaway caused by the end cover assembly 21 slipping relative to the shell body 231 and causing leakage from the joint between the two.

[0114] In some embodiments, the first sub-side 2321 is welded to the end cover assembly 21 so that the end cover assembly 21 is fixed to the housing 23 .

[0115] In some embodiments, see Figures 4 to 6 The flange 232 includes a first portion 2321a, which extends along an extension direction of an edge of the mounting opening 231b where the first portion 2321a is located, and a dimension of the first portion 2321a along the extension direction of the edge where the first portion 2321a is located is equal to a dimension of the edge.

[0116] The first portion 2321 a is at least a portion of the first sub-side 2321 .

[0117] This is beneficial to increase the size of the first portion 2321a, improve the effect of the first portion 2321a on supporting the end cover assembly 21, and further reduce the probability of the end cover assembly 21 separating from the shell 23 after thermal runaway occurs in the battery cell 20.

[0118] In some embodiments, in a projection plane perpendicular to the first direction, a projection profile of the mounting opening 231 b has a plurality of edges, and the first portion 2321 a is correspondingly disposed on some of the edges.

[0119] The number of the first part 2321a may be one or more.

[0120] In some embodiments, seeFigure 7 and Figure 8 The flanging 232 includes a second part 2321b, and the second part 2321b is arranged on the long side 231ba of the mounting opening 231b.

[0121] Thus, arranging the second part 2321b on the long side 231ba helps to inhibit the tendency of the part of the housing body 231 forming the long side 231ba to move relative to the end cap assembly 21 and separate.

[0122] In some embodiments, referring to Figure 7 and Figure 8 the second part 2321b and the long side 231ba of the mounting opening 231b have equal dimensions along the extension direction of the long side 231ba. That is to say, a part of the flanging 232 can be either the second part 2321b or the first part 2321a.

[0123] Thus, it can better reduce the probability that the structure of the housing body 231 forming the long side 231ba separates from the end cap assembly 21 under the impact of the emissions generated during thermal runaway.

[0124] In some embodiments, referring to Figure 7 and Figure 8 each long side 231ba is provided with a second part 2321b.

[0125] That is to say, the projected contour of the mounting opening 231b has multiple long sides 231ba. For example, if the projected contour of the mounting opening 231b is rectangular, then the projected contour of the mounting opening 231b has two long sides 231ba.

[0126] Thus, it helps to reduce the probability that the structure of the housing body 231 forming the long side 231ba separates from the end cap assembly 21 under the impact of the emissions generated during thermal runaway.

[0127] In some embodiments, third parts 2321c are respectively provided on all adjacent two sides of the mounting opening 231b.

[0128] Thus, it helps to improve the structural strength of the housing body 231 forming the mounting opening 231b and reduce the probability that the connection positions of each side separate from the end cap assembly 21 under the impact of the emissions during thermal runaway.

[0129] In some embodiments, referring to Figure 9 in the projection plane perpendicular to the open direction of the mounting opening 231b, the connection position of the two third parts 2321c is arc-shaped.

[0130] That is to say, the connection position of the two third parts 2321c is rounded.

[0131] Thus, it is beneficial to reduce the risk of cracking between the connection positions of the two third parts 2321c due to stress concentration after being stressed.

[0132] In some embodiments, referring to Figure 9 , the arc radius range of the connection position of the two third parts 2321c is from 2 mm to 3 mm. That is, the arc radius of the connection position of the two third parts 2321c is R, and 2 mm ≤ R ≤ 3 mm.

[0133] Thus, it is beneficial to reduce the probability of interference between the connection position of the two third parts 2321c and the structure on the end cap assembly 21 while maintaining the structural strength of the connection position of the two third parts 2321c to meet the requirements.

[0134] The specific values of the arc radius of the connection position of the two third parts 2321c can be 2 mm, 2.2 mm, 2.4 mm, 2.5 mm, 2.6 mm, 2.8 mm, 3 mm.

[0135] The specific method for measuring the arc radius of the connection position of the two third parts 2321c is not limited. For example, in an environment with a room temperature of 25 °C, the first sub-edge 2321 is placed in the measurement area of the projection measuring instrument along the first direction, and the specific size of the arc radius of the connection position of the two third parts 2321c can be measured.

[0136] In some embodiments, referring to Figure 9 , at least one third part 2321c is provided on the long side 231ba of the mounting opening 231b.

[0137] Thus, the third part 2321c on the side adjacent to the long side 231ba can additionally enhance the structural strength of the structure forming the long side 231ba of the mounting opening 231b, and reduce the probability that the structure of the long side 231ba of the mounting opening 231b formed by the housing body 231 is deformed under the impact of the emissions during thermal runaway.

[0138] It can be understood that a part of the flanging 232 can be at least one of the first part 2321a, the second part 2321b, and the third part 2321c.

[0139] In some embodiments, referring to Figure 7 and Figure 8 , the outer contour surface of the housing body 231 includes a large surface 231c, and at least a part of the flanging 232 is provided on the side of the mounting opening 231b close to the large surface 231c.

[0140] The outer contour surface of the housing body 231 refers to the surface of the housing body 231 exposed to the outside of the battery cell 20.

[0141] The large surface 231c refers to the one with the largest area among the multiple surfaces of the shell body 231 exposed to the outside of the battery cell 20.

[0142] It can be understood that since the area of the large surface 231c is the largest, it is beneficial to make the side dimension of the installation opening 231b closer to the large surface 231c longer; in addition, the force exerted by the emissions generated during thermal runaway on the structure of the large surface 231c formed by the shell body 231 is also relatively large, and the structure of the side of the shell body 231 where the installation opening 231b is formed closer to the large surface 231c is prone to deformation.

[0143] That is to say, a flanging 232 is provided on the side of the installation opening 231b closer to the large surface 231c.

[0144] In this way, by arranging at least a part of the first sub-edge 2321 on the side close to the large surface 231c, on the one hand, it is beneficial to increase the size of the first sub-edge 2321 and the area where the first sub-edge 2321 plays a blocking role on the end cover assembly 21; on the other hand, it is beneficial to reduce the probability that the structure of the side of the shell body 231 close to the large surface 231c deforms under the impact of the emissions during thermal runaway.

[0145] In some embodiments, the wall surface with the largest area in the accommodation space 231a is located on the side of the accommodation space 231a close to the large surface 231c, so as to be beneficial to the proportion of the accommodation space 231a in the space of the shell body 231.

[0146] In some embodiments, the long side 231ba of the installation opening 231b is located on the side of the installation opening 231b close to the large surface 231c, which is beneficial to extending the size of the long side 231ba and the size of the second part 2321b.

[0147] In some embodiments, refer to Figure 10 , the first sub-edge 2321 extends along the edge of the installation opening 231b to surround the circumferential side of the installation opening 231b.

[0148] In this way, the circumferential side of the end cover assembly 21 can be blocked by the first sub-edge 2321, further reducing the tendency of the end cover assembly 21 to separate from the housing 23 under the impact of the emissions generated during thermal runaway.

[0149] In some embodiments, refer to Figure 4 , in the projection plane perpendicular to the first direction, the dimension of the flanging 232 perpendicular to its own extension direction ranges from 1 mm to 10 mm. That is, Figure 4 in

[0150] Thus, on the one hand, it is beneficial to stagger the joint position between the flanging 232 and the end cap assembly 21 relative to the joint position between the end cap assembly 21 and the housing body 231, improving the blocking effect of the flanging 232 on the end cap assembly 21; on the other hand, it is beneficial to reduce the probability of interference between the flanging 232 and other structures on the end cap assembly 21.

[0151] In the projection plane perpendicular to the first direction, the dimension of the flanging 232 perpendicular to its own extension direction can specifically be 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, etc.

[0152] There is no limit to the specific method of measuring the dimension of the flanging 232 perpendicular to its own extension direction in the projection plane perpendicular to the first direction. Exemplarily, in an environment at room temperature of 25 °C, the jaws and the vernier of a vernier caliper are respectively abutted against both ends of the flanging 232 perpendicular to its own extension direction in the projection plane perpendicular to the first direction, and the reading of the vernier is taken.

[0153] In some embodiments, refer to Figures 11 to 14 , the flanging 232 includes a second sub-edge 2322, and the second sub-edge 2322 is located on the side of the end cap assembly 21 close to the mounting opening 231b along the first direction.

[0154] In a thermal runaway state, some emissions will be blocked by the second sub-edge 2322 after moving along the first direction and will not directly impact the end cap assembly 21, thereby reducing the impact force on the end cap assembly 21 and reducing the probability of the end cap assembly 21 separating from the housing 23 due to the impact of emissions generated during thermal runaway.

[0155] In some embodiments, refer to Figure 14 , the side of the end cap assembly 21 close to the mounting opening 231b along the first direction is in contact with the second sub-edge 2322.

[0156] Thus, it is beneficial to reduce the probability that emissions generated during thermal runaway enter the joint between the second sub-edge 2322 and the end cap assembly 21 and impact the end cap assembly 21.

[0157] In some embodiments, the second sub-edge 2322 is welded to the end cap assembly 21 to fix the end cap assembly 21 to the housing 23.

[0158] In some embodiments, refer to Figures 3 to 9 , the first sub-edge 2321 includes at least one of a first portion 2321a, a second portion 2321b, and a third portion 2321c.

[0159] In some embodiments, the second sub-edge 2322 includes a first portion 2321a that extends along the extension direction of the edge of the mounting opening 231b where it is located, and the dimension of the first portion 2321a along the extension direction of the edge where it is located is equal to the dimension of this edge.

[0160] In this way, since it is beneficial to increase the dimension of the first portion 2321a, the effect of the first portion 2321a shielding the emissions for the end cap assembly 21 is improved.

[0161] In some embodiments, the second sub-edge 2322 includes a second portion 2321b that is disposed on the long side 231ba of the mounting opening 231b.

[0162] In this way, setting the second portion 2321b on the long side 231ba is beneficial to suppressing the tendency of the partial structure of the shell body 231 forming the long side 231ba to move relative to the end cap assembly 21 and separate.

[0163] In some embodiments, the second portion 2321b and the long side 231ba of the mounting opening 231b have equal dimensions along the extension direction of the long side 231ba. That is to say, a part of the second sub-edge 2322 can be either the first portion 2321a or the second portion 2321b.

[0164] In this way, it is possible to better reduce the probability that the structure of the shell body 231 forming the long side 231ba separates relative to the end cap assembly 21 under the impact of the emissions generated by thermal runaway.

[0165] In some embodiments, the second sub-edge 2322 includes a third portion 2321c, and the third portion 2321c is provided on at least partially adjacent two edges of the mounting opening 231b, and the two third portions 2321c are connected to each other.

[0166] In this way, through the connection of the two third portions 2321c to each other, it is beneficial to improve the connection strength of the structures of the adjacent two edges forming the mounting opening 231b and reduce the risk of deformation and cracking of the adjacent two edges of the mounting opening 231b; the two third portions 2321c can strengthen each other and improve the ability to resist the impact of the emissions of thermal runaway.

[0167] In some embodiments, referring to Figure 12 , the second sub-edge 2322 extends along the edge of the mounting opening 231b to surround the circumferential side of the mounting opening 231b.

[0168] In this way, it is beneficial to block the impact of the emissions flowing along the side wall of the installation space on the end cap assembly 21 and reduce the probability of separation of the end cap assembly 21 and the housing 23 under the impact of the emissions generated by thermal runaway.

[0169] In some embodiments, in a projection plane perpendicular to the first direction, the dimension range of the second sub-edge 2322 perpendicular to its own extension direction is 1 mm to 10 mm.

[0170] In this way, on the one hand, the shielding effect of the second sub-edge 2322 on the emissions is improved; on the other hand, it is beneficial to reduce the probability of interference between the second sub-edge 2322 and other structures on the end cover assembly 21.

[0171] In a projection plane perpendicular to the first direction, the dimension of the second sub-edge 2322 perpendicular to its own extension direction can specifically be 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, etc.

[0172] In some embodiments, referring to Figure 13 and Figure 14 , the end cover assembly 21 includes a pressure relief mechanism 211. In this way, the second sub-edge 2322 can play a role in guiding the emissions to flow towards the pressure relief mechanism 211, thereby being beneficial to improving the efficiency of the pressure relief mechanism 211 in discharging the emissions.

[0173] In some embodiments, referring to Figure 5 and Figure 14 , in a projection plane perpendicular to the first direction, the projection of the flanging 232 is located outside the projection range of the electrode assembly 22.

[0174] In this way, it is beneficial to reduce the probability of interference between the electrode assembly 22 and the flanging 232 during the process of installing the electrode assembly 22 into the installation space, and improve the installation efficiency.

[0175] In some embodiments, in a projection plane perpendicular to the first direction, the projection profile of the electrode assembly 22 is an oval with a waist shape, so that the arc portion forming the projection profile can avoid the flanging 232.

[0176] In some embodiments, the flanging 232 and the shell body 231 are of an integral structure. That is to say, the two are different parts of the same part.

[0177] In this way, the connection strength between the two is improved, and the production and manufacturing process of the two is simplified.

[0178] The specific manufacturing method for manufacturing the flanging 232 and the shell body 231 into an integral structure is not limited. For example, extrusion molding, casting molding, additive manufacturing, etc.

[0179] The specific method for forming the flanging 232 is not limited. By extruding the shell body 231 and the flanging blank, the flanging blank is located at the edge of the installation opening 231b and extends along the first direction, and the flanging blank is bent towards the installation opening 231b to form the flanging 232.

[0180] The scheme of the battery cell 20 in a specific embodiment of the present application is as follows:

[0181] The battery cell 20 includes an end cap assembly 21, an electrode assembly 22 and a shell 23, wherein the shell 23 includes a shell body 231 and a flange 232, wherein the shell body 231 is provided with a receiving space 231a, wherein one side of the receiving space 231a along the first direction is open to form a mounting opening 231b, wherein a flange 232 is provided at the edge of the mounting opening 231b, and the electrode assembly 22 is located in the receiving space 231a; the end cap assembly 21 blocks the mounting opening 231b and is connected to the shell 23, wherein the flange 232 includes a first sub-edge 2321, wherein the first sub-edge 2321 is located on a side of the end cap assembly 21 away from the mounting opening 231b along the first direction, and a side of the first sub-edge 2321 close to the end cap assembly 21 abuts against the end cap assembly 21 along the first direction. The first sub-side 2321 includes at least one of a first portion 2321a, a second portion 2321b and a third portion 2321c. The first portion 2321a extends along the extension direction of the side of the mounting port 231b where it is located, and the size of the first portion 2321a along the extension direction of the side where it is located is equal to the size of the side. The second portion 2321b is arranged on the long side 231ba of the mounting port 231b, and each long side 231ba is provided with a second portion 2321b. The two sides of the mounting port 231b at least partially adjacent are respectively provided with a third portion 2321c, and the third portion 2321c extends along the length direction of the side where it is located and is connected to the third portion 2321c on the other adjacent side. In the projection plane perpendicular to the opening direction of the mounting port 231b, the connection position of the two third portions 2321c is an arc shape. The arc radius of the connection position of the two third portions 2321c ranges from 2mm to 3mm. At least one third portion 2321c is provided at the long side 231ba of the mounting opening 231b. The outer contour surface of the shell body 231 includes a large surface 231c, and the side of the mounting opening 231b close to the large surface 231c is provided with at least part of the first sub-side 2321. In the projection plane perpendicular to the first direction, the size range of the first sub-side 2321 perpendicular to its own extension direction is 1mm to 10mm. In the projection plane perpendicular to the first direction, the projection of the flange 232 is located outside the projection range of the electrode assembly 22.

[0182] The embodiment of the present application further provides a battery device 100 , which includes a box body 10 and the battery cell 20 in the aforementioned embodiment. An installation space is provided in the box body 10 , and the battery cell 20 is provided in the installation space.

[0183] In this way, by providing the flange 232 , the risk of the battery cell 20 that has thermal runaway disintegrating in the installation space is reduced, and the risk of causing damage to other components in the battery device 100 is reduced.

[0184] The embodiment of the present application further provides an electrical device, comprising the battery device 100 in the aforementioned embodiment.

[0185] In this way, the risk of damage to other components in the electrical device caused by thermal runaway of the battery cell 20 is reduced.

[0186] The various embodiments / implementation manners provided in this application can be combined with each other without contradiction.

[0187] The above are only the preferred embodiments of this application and are not used to limit the embodiments in this application. For those skilled in the art, the embodiments of this application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the embodiments of this application shall be included within the protection scope of the embodiments of this application.

Claims

1. A battery cell, characterized in that: The battery cell comprises: End cap assembly; Electrode assembly; A shell, comprising a shell body and a flange, wherein the shell body is provided with a receiving space, one side of the receiving space along a first direction is opened to form a mounting opening, an edge of the mounting opening is provided with the flange, and the electrode assembly is located in the receiving space; The end cover assembly blocks the installation opening and is connected to the housing, and a portion of the flange is located on at least one side of the end cover assembly along the first direction; The flange includes a third portion, and the third portion is respectively provided on at least two adjacent sides of the installation opening. The third portion extends along the length direction of the side where the third portion is located and is connected to the third portion on the other adjacent side.

2. The battery cell according to claim 1, characterized in that: The installation opening is polygonal, and at least a portion of the flange is arranged on a long side of the polygon.

3. The battery cell according to claim 1, characterized in that: The flange includes a first sub-edge, the first sub-edge is located on a side of the end cover assembly away from the installation opening along the first direction, and a side of the first sub-edge close to the end cover assembly abuts against the end cover assembly along the first direction.

4. The battery cell according to claim 1, characterized in that: The flange includes a first portion, which extends along an extension direction of an edge of the installation opening where the first portion is located, and a size of the first portion along the extension direction of the edge where the first portion is located is equal to a size of the edge.

5. The battery cell according to claim 1, characterized in that: The flange includes a second portion, and the second portion is arranged on a long side of the installation opening.

6. The battery cell according to claim 5, characterized in that: Each of the long sides is provided with the second portion.

7. The battery cell according to claim 1, characterized in that: In a projection plane perpendicular to the opening direction of the installation opening, a connection position of the two third parts is in an arc shape.

8. The battery cell according to claim 6, characterized in that: The arc radius of the connection position of the two third parts ranges from 2 mm to 3 mm.

9. The battery cell according to claim 1, characterized in that: At least one of the third portions is disposed on a long side of the mounting opening.

10. The battery cell according to claim 1, characterized in that: The flange extends along the edge of the installation opening to surround the peripheral side of the installation opening.

11. The battery cell according to claim 1, characterized in that: In the projection plane perpendicular to the first direction, the dimension of the flange perpendicular to its own extension direction ranges from 1 mm to 10 mm.

12. The battery cell according to claim 1, characterized in that: The flange includes a second sub-edge, which is located on a side of the end cover assembly close to the installation opening along the first direction, and a side of the end cover assembly close to the installation opening along the first direction is in contact with the second sub-edge.

13. The battery cell according to claim 12, characterized in that: The second sub-edge extends along the edge of the installation opening to surround the peripheral side of the installation opening.

14. The battery cell according to claim 1, characterized in that: In a projection plane perpendicular to the first direction, the projection of the flange is outside the projection range of the electrode assembly.

15. A battery device, characterized in that: The battery device comprises a box body and the battery cell according to any one of claims 1 to 14, wherein an installation space is provided in the box body, and the battery cell is provided in the installation space.

16. An electrical device, characterized in that: A battery device comprising the battery device of claim 15.

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