Battery monomer, battery device and electric device

Abstract

The utility model provides a battery monomer, a battery device and a power utilization device. The battery monomer comprises a shell, an electrode assembly and an end cover assembly, an opening is formed in the end, in the first direction, of the shell. The end cover assembly covers the opening and comprises an end cover, an electrode terminal, a pressure relief mechanism and an adapter, and the pressure relief mechanism is located on one side, in the second direction, of the electrode terminal. The first direction is perpendicular to the second direction. Wherein the adapter comprises a first connecting part, a second connecting part and a first bending part, the first connecting part is connected to the tab, and the first bending part is connected to one end, close to the pressure relief mechanism along the second direction, of the first connecting part and is bent relative to the first connecting part; the second connecting part is connected to the first bending part and located on the side, back to the tab, of the first connecting part, and the second connecting part is connected to the electrode terminal. And at least part of the pressure relief mechanism exceeds the first bending part along the direction from the electrode terminal to the pressure relief mechanism. The reliability of the battery monomer can be improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cell, a battery device, and an electrical device. Background Art

[0002] Battery cells are widely used in electronic devices such as mobile phones, laptops, electric bicycles, electric cars, electric airplanes, electric boats, electric toy cars, electric toy boats, electric toy airplanes, and power tools. Battery cells can include nickel-cadmium battery cells, nickel-metal hydride battery cells, lithium-ion battery cells, and secondary alkaline zinc-manganese battery cells.

[0003] In the development of battery technology, how to improve the reliability of battery cells has always been a research direction in battery technology. Utility Model Content

[0004] In view of the above problems, the present application provides a battery cell, a battery device and an electrical device, which can improve the reliability of the battery cell.

[0005] In a first aspect, the present application provides a battery cell. The battery cell includes a shell, an electrode assembly, and an end cap assembly. The shell is provided with an opening at an end along a first direction. The electrode assembly is housed in the shell, and the electrode assembly includes a tab. The end cap assembly covers the opening and includes an end cap, an electrode terminal, a pressure relief mechanism, and an adapter. The end cap is connected to the shell, and the electrode terminal and the pressure relief mechanism are provided on the end cap. The pressure relief mechanism is located on one side of the electrode terminal along a second direction. The first direction is perpendicular to the second direction. The adapter includes a first connecting portion, a second connecting portion, and a first bending portion. The first connecting portion is connected to the tab. The first bending portion is connected to an end of the first connecting portion close to the pressure relief mechanism along the second direction and is bent relative to the first connecting portion. The second connecting portion is connected to the first bending portion and is located on the side of the first connecting portion facing away from the tab. The second connecting portion is connected to the electrode terminal. Along the direction from the electrode terminal to the pressure relief mechanism, at least a portion of the pressure relief mechanism extends beyond the first bending portion.

[0006] In the above solution, at least part of the pressure relief mechanism is extended beyond the first bent portion along the direction of the electrode terminal pointing to the pressure relief mechanism. Since the first bent portion has a two-layer structure, the stiffness of the first bent portion is greater than the stiffness of the periphery of the first connecting portion, thereby reducing the risk of the adapter deforming and blocking the pressure relief hole when thermal runaway occurs in the battery cell, thereby improving the reliability of the battery cell.

[0007] In some embodiments, a projection of the first bent portion in the first direction overlaps with a projection of a portion of the pressure relief mechanism in the first direction.

[0008] In the above solution, the above arrangement is conducive to increasing the overall size of the adapter, thereby increasing the overall current capacity of the adapter, improving the power output capacity and cycle stability of the battery cell, and improving the reliability of the battery cell.

[0009] In some embodiments, in the second direction, the end of the first connecting portion away from the first bending portion is spaced apart from the pressure relief mechanism.

[0010] In the above solution, when thermal runaway occurs in a battery cell, the area on the adapter with lower stiffness than other areas is away from the pressure relief mechanism, thereby reducing the possibility of the deformed area of ​​the adapter blocking the pressure relief mechanism and improving the reliability of the battery cell.

[0011] In some embodiments, the end cap is provided with an injection hole, and the injection hole and the pressure relief mechanism are respectively provided on opposite sides of the electrode terminal along the second direction to reduce the risk of deformation of the end cap due to insufficient strength in a local area of ​​the end cap and improve the reliability of the battery cell.

[0012] In some embodiments, a projection of an end portion of the first connecting portion away from the first bending portion in the first direction at least partially overlaps with a projection of the liquid injection hole in the first direction.

[0013] In the above solution, the above arrangement is conducive to increasing the size of the first connecting portion, thereby increasing the overall size of the adapter, increasing the overall current capacity of the adapter, and improving the reliability of the battery cell.

[0014] In some embodiments, a projection of the adapter in the first direction and a projection of the pressure relief mechanism in the first direction are arranged not to overlap.

[0015] In the above solution, the above arrangement further reduces the risk of the adapter deforming and blocking the pressure relief hole when thermal runaway occurs in the battery cell, thereby improving the reliability of the battery cell.

[0016] In some embodiments, the second connection portion includes a first sub-connection portion, a second sub-connection portion, and a second bend portion, wherein the first sub-connection portion is connected to the second sub-connection portion via the second bend portion, the first sub-connection portion is connected to the electrode terminal, and the second sub-connection portion is connected to the first bend portion. The first bend portion and the second bend portion are spaced apart along the second direction.

[0017] In the above scheme, by setting the second bending portion, it is beneficial to reduce the difficulty of connecting the adapter and the electrode terminal, while reducing the pulling force of the first bending portion on the connection between the first sub-connecting portion and the electrode terminal during the bending process, thereby reducing the possibility of the first bending portion causing the first sub-connecting portion and the electrode terminal to separate during the bending process.

[0018] In some embodiments, the number of end cover assemblies includes two, and openings are provided at both ends of the shell along the first direction. The two end cover assemblies respectively cover the openings at both ends, which is conducive to increasing the exhaust channel for pressure relief, thereby improving the pressure relief efficiency and improving the reliability of the battery cell.

[0019] In some embodiments, the pressure relief mechanisms of the two end cover assemblies are arranged opposite to each other along the first direction.

[0020] In the above scheme, through the above setting, the two exhaust channels for pressure relief are connected along the first direction. When the emissions are discharged through the exhaust channels, the blockage of one or both exhaust channels by the electrode assembly is reduced, while the distance between the electrode assembly and the outer shell set to avoid the obstruction of the electrode assembly is reduced, thereby improving space utilization and increasing energy density.

[0021] In some embodiments, the adapter further includes a protrusion, which extends from the end of the first connecting portion toward the end cap, and / or extends from the side of the first bending portion toward the end cap.

[0022] In the above solution, the protrusion can play a supporting role. When the battery cell experiences thermal runaway and the electrode assembly squeezes the adapter, the presence of the protrusion can reduce the possibility of deformation of the adapter, thereby improving the reliability of the battery cell.

[0023] In some embodiments, a conductive adhesive is provided in the first bend portion, thereby improving the overall stiffness of the first bend portion, further reducing the possibility of deformation of the first bend portion when thermal runaway occurs in the battery cell, reducing the possibility of the adapter blocking the pressure relief hole, and improving the reliability of the battery cell.

[0024] In some embodiments, the end cap is provided with a pressure relief hole, the pressure relief mechanism is provided in the pressure relief hole, and the centroid of the pressure relief hole exceeds the first bending portion along the direction of the electrode terminal pointing to the pressure relief mechanism.

[0025] In the above solution, the above arrangement is helpful to reduce the shielding area of ​​the pressure relief hole by the adapter, thereby reducing the possibility of the adapter blocking the pressure relief hole when thermal runaway occurs in the battery cell, and improving the reliability of the battery cell.

[0026] In a second aspect, an embodiment of the present application provides a battery device comprising a battery cell according to any of the aforementioned embodiments.

[0027] In a third aspect, an embodiment of the present application provides an electrical device, comprising a battery device according to any of the aforementioned embodiments, and the battery device is used to provide electrical energy.

[0028] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0030] Figure 1 This is a schematic structural diagram of a vehicle provided in an embodiment of the present application;

[0031] Figure 2 This is a schematic diagram of the explosion structure of a battery provided in an embodiment of the present application;

[0032] Figure 3 This is a schematic structural diagram of a battery module provided in an embodiment of the present application;

[0033] Figure 4 This is a schematic structural diagram of a battery cell provided in an embodiment of the present application;

[0034] Figure 5 is a schematic cross-sectional structure diagram of a battery cell provided in an embodiment of the present application;

[0035] Figure 6 yes Figure 5 A schematic diagram of an enlarged structure of P in the figure;

[0036] Figure 7 This is a schematic structural diagram of an end cap assembly in a battery cell provided in an embodiment of the present application;

[0037] Figure 8 This is a schematic structural diagram of another battery cell end cap assembly provided in an embodiment of the present application;

[0038] Figure 9 yes Figure 5 Another enlarged structural diagram of P in the middle;

[0039] Figure 10 yes Figure 5 Another enlarged structural diagram of P in the middle;

[0040] Figure 11 yes Figure 5 Another enlarged structural diagram of P in the middle;

[0041] Figure 12 is a schematic cross-sectional structure diagram of another battery cell provided in an embodiment of the present application;

[0042] Figure 13 is a schematic cross-sectional structure diagram of another battery cell provided in an embodiment of the present application;

[0043] Figure 14 This is a schematic diagram of the cross-sectional structure of another battery cell provided in an embodiment of the present application.

[0044] Marking Description

[0045] 1000, vehicle;

[0046] 100, battery device; 200, controller; 300, motor; 400, housing; 410, first housing portion; 420, second housing portion; 430, storage portion; 500, battery module;

[0047] 110. Battery cell;

[0048] 10. Housing;

[0049] 20. Electrode assembly; 21. Tab;

[0050] 30. End cap assembly; 31. End cap; 32. Electrode terminal; 33. Pressure relief mechanism; 34. Adapter; 341. First connecting portion; 342. Second connecting portion; 3421. First sub-connecting portion; 3422. Second sub-connecting portion; 3423. Second bending portion; 343. First bending portion; 344. Protrusion; 35. Insulator;

[0051] 40. Conductive adhesive;

[0052] K1, injection hole;

[0053] X, first direction; Y, second direction. DETAILED DESCRIPTION

[0054] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0055] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art 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 claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0056] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0057] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0058] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0059] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0060] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0061] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0062] 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.

[0063] The battery cells can be lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid batteries, etc., which are not limited in the embodiments of the present application.

[0064] A battery cell typically includes an electrode assembly. This assembly includes a positive electrode, a negative electrode, and a separator, which is positioned between the positive and negative electrodes. During the charge and discharge process of a battery cell, active ions (such as lithium ions) are intercalated and released between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0065] The electrode assembly may be a wound structure, a laminated structure, or a mixed structure of wound and laminated structures.

[0066] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0067] In some embodiments, the electrode assembly is a laminate structure.

[0068] As an example, multiple positive electrode sheets and multiple negative electrode sheets can be provided respectively, and the multiple positive electrode sheets and the multiple negative electrode sheets can be alternately stacked.

[0069] As an example, a plurality of positive electrode sheets may be provided, and the negative electrode sheet may be folded to form a plurality of stacked folded segments, with a positive electrode sheet being sandwiched between adjacent folded segments.

[0070] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of folded segments that are stacked.

[0071] As an example, a plurality of separators may be provided, each of which is disposed between any adjacent positive electrode sheets or negative electrode sheets.

[0072] As an example, the separator may be provided continuously, and may be provided between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0073] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0074] In some embodiments, the electrode assembly is provided with tabs that can conduct current from the electrode assembly. The tabs include a positive tab and a negative tab.

[0075] In some embodiments, the battery cell may include an outer shell. The outer shell may be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film. In some embodiments, the outer shell may be a sealed structure or a non-sealed structure. As an example, when the outer shell is a non-sealed structure, the outer shell serves to protect the electrode assembly, and a sealing bag is further included between the outer shell and the electrode assembly, which is used to encapsulate the electrode assembly and the electrolyte. Specifically, the sealing bag may be a bag-shaped insulating member or an aluminum-plastic film. When the outer shell is a sealed structure, it is used to encapsulate components such as the electrode assembly and the electrolyte.

[0076] In some embodiments, the housing includes an end cap and a shell, wherein the shell has an opening and the end cap covers the opening. The shell may have one or more openings. One or more end caps may also be provided.

[0077] In some embodiments, the housing is provided with at least one electrode terminal, which is electrically connected to the electrode tab. The electrode terminal may be indirectly connected to the electrode tab via a current collecting member. The electrode terminal may be provided on an end cap or on the housing.

[0078] In some embodiments, the housing is provided with a pressure relief mechanism for discharging internal gas of the battery cell.

[0079] For example, a battery cell's internal pressure or temperature reaches a predetermined threshold, triggering the release of internal pressure or temperature. When the internal pressure or temperature of the battery cell reaches the predetermined threshold, the pressure relief mechanism activates, or a weakened structure within the pressure relief mechanism is destroyed, thereby creating an opening or channel for the internal pressure or temperature to release. This threshold design varies depending on design requirements. The threshold may depend on the material of one or more of the positive electrode sheet, negative electrode sheet, electrolyte, and separator in the battery cell.

[0080] As an example, the pressure relief mechanism may be integrally formed with the housing.

[0081] As an example, the pressure relief mechanism may also be provided separately from and connected to the housing.

[0082] The "activation" mentioned in this application refers to the action of the pressure relief mechanism or its activation to a certain state, so that the internal pressure and temperature of the battery cell can be released. The action produced by the pressure relief mechanism may include but is not limited to: the movement of components in the pressure relief mechanism to form an exhaust channel, at least a part of the pressure relief mechanism rupturing, breaking, tearing or opening, etc. When the pressure relief mechanism is actuated, the high-temperature and high-pressure substances inside the battery cell will be discharged outward from the actuated part as emissions. In this way, the pressure and temperature of the battery cell can be relieved under controllable pressure or temperature, thereby avoiding potential more serious accidents.

[0083] In some embodiments, when the outer shell is a non-sealed structure, the pressure relief mechanism can be configured as a through hole for discharging gas from inside the battery cell.

[0084] The emissions from the battery cells mentioned in this application include but are not limited to: electrolyte, dissolved or split positive and negative electrode sheets, fragments of separators, high-temperature and high-pressure gases generated by the reaction, flames, etc.

[0085] The battery apparatus mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include multiple battery cells, which are connected in series, parallel, or hybrid via a busbar.

[0086] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells.

[0087] As an example, the battery cell assembly may be a battery module, which is formed by arranging and fixing multiple battery cells to form an independent module. As an example, the battery module may be formed by bundling multiple battery cells with a cable tie.

[0088] In some embodiments, the battery device may be a battery pack, which includes a case and one or more battery cell assemblies, wherein the battery cell assemblies are housed in the case.

[0089] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box by fixing the battery module in the box.

[0090] As an example, the battery cell assembly may also be housed in the box by directly fixing the plurality of battery cells to the box.

[0091] As an example, the housing may include a first housing and a second housing. The first housing and the second housing engage to form an enclosed space within the housing to house the battery cell assembly. Enclosed here means covered or closed, and can be either sealed or unsealed. The first housing may be a top cover or a bottom plate.

[0092] As an example, the box may include a top cover, a frame, and a bottom plate, wherein the top cover and the bottom plate are respectively connected to the frame to form a closed space inside the box to accommodate the battery cell assembly.

[0093] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0094] The technical solutions described in the embodiments of the present application are applicable to various electrical devices that use battery cells, such as mobile phones, portable devices, laptop computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, for example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

[0095] When the pressure relief mechanism is actuated, the electrode assembly inside the battery cell will move toward the pressure relief hole driven by the discharge, causing the electrode assembly to squeeze the adapter between the electrode assembly and the outer shell, thereby causing the adapter to deform and move toward the pressure relief hole, causing the pressure relief hole to be blocked, thereby increasing the risk of fire and explosion caused by thermal runaway of the battery cell and reducing the reliability of the battery cell.

[0096] Based on the above technical problems, the present application provides a technical solution, which extends at least part of the pressure relief mechanism beyond the first bent portion along the direction of the electrode terminal pointing to the pressure relief mechanism. Since the first bent portion has a two-layer structure, the stiffness of the first bent portion is greater than the stiffness of the periphery of the first connecting portion, thereby reducing the risk of deformation of the adapter and blocking the pressure relief hole when thermal runaway occurs in the battery cell, thereby improving the reliability of the battery cell.

[0097] The technical solutions described in the embodiments of the present application are applicable to batteries and electrical devices using batteries, such as mobile phones, portable devices, laptops, electric vehicles, electric cars, ships, spacecraft, electric toys and electric tools, etc., among which spacecraft include airplanes, rockets, space shuttles and spacecraft, etc., electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc., and electric tools include metal cutting power tools, grinding power tools, assembly power tools and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers.

[0098] The battery cells described in the embodiments of the present application are not limited to being applicable to the electrical devices described above, but for the sake of simplicity, the following embodiments are described using electric vehicles as an example.

[0099] See also Figure 1 , Figure 1 It is a structural schematic diagram of a vehicle provided in an embodiment of the present application.

[0100] The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 100 may be provided inside the vehicle 1000. Specifically, for example, the battery device 100 may be provided at the bottom, front or rear of the vehicle 1000. The battery device 100 may be used to power the vehicle 1000. For example, the battery device 100 may serve as an operating power source for the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300. The controller 200 is used, for example, to control the battery to power the motor 300. The battery may be used for starting and navigating the vehicle 1000. Of course, the battery device 100 may also be used to drive the vehicle 1000, replacing or partially replacing fuel or natural gas to provide drive for the vehicle 1000.

[0101] Figure 2 Schematic diagram of the explosion structure of a battery provided in an embodiment of the present application. Figure 2 As shown, the battery device 100 includes a box body 400 and battery cells (not shown in the figure), and the battery cells are accommodated in the box body 400.

[0102] The housing 400 is used to house battery cells and can have various structures. In some embodiments, the housing 400 can include a first housing portion 410 and a second housing portion 420. The first housing portion 410 and the second housing portion 420 overlap each other and together define a receiving portion 430 for accommodating the battery cells. The second housing portion 420 can be a hollow structure with one end open. The first housing portion 410 is a plate-like structure, and the first housing portion 410 overlaps the open side of the second housing portion 420 to form the housing with the receiving portion 430. Alternatively, both the first housing portion 410 and the second housing portion 420 can be hollow structures with one end open. The open side of the first housing portion 410 overlaps the open side of the second housing portion 420 to form the housing 400 with the receiving portion 430. Of course, the first housing portion 410 and the second housing portion 420 can have various shapes, such as a cylinder, a rectangular parallelepiped, etc.

[0103] In the battery device 100, there can be one or more battery cells. If there are multiple battery cells, they can be connected in series, in parallel, or in a hybrid configuration. A hybrid configuration refers to a combination of series and parallel connections. Multiple battery cells can be directly connected in series, in parallel, or in a hybrid configuration, and then the entire battery module can be housed within the housing 400. Alternatively, multiple battery cells can be first connected in series, in parallel, or in a hybrid configuration to form a battery module 500, and then the battery modules 500 can be connected in series, in parallel, or in a hybrid configuration to form a single unit housed within the housing 400.

[0104] Figure 3It is a structural schematic diagram of a battery module provided in an embodiment of the present application.

[0105] In some embodiments, as Figure 3 As shown, there are multiple battery cells 110, which are first connected in series, in parallel, or in series to form a battery module 500. The multiple battery modules 500 are then connected in series, in parallel, or in series to form a whole, which is then housed in a box.

[0106] Figure 4 This is a schematic structural diagram of a battery cell provided in an embodiment of the present application. Figure 5 It is a schematic diagram of the cross-sectional structure of a battery cell provided in an embodiment of the present application. Figure 6 yes Figure 5 Schematic diagram of an enlarged structure of P.

[0107] See also Figures 4 to 6 The embodiment of the present application provides a battery cell 110, which includes a shell 10, an electrode assembly 20 and an end cap assembly 30. The shell 10 is provided with an opening at the end along the first direction X. The electrode assembly 20 is accommodated in the shell 10, and the electrode assembly 20 includes a tab 21. The end cap assembly 30 covers the opening, and the end cap assembly 30 includes an end cap 31, an electrode terminal 32, a pressure relief mechanism 33 and an adapter 34. The end cap 31 is connected to the shell 10, and the electrode terminal 32 and the pressure relief mechanism 33 are arranged on the end cap 31. The pressure relief mechanism 33 is located on one side of the electrode terminal 32 along the second direction Y. The first direction X is perpendicular to the second direction Y. The adapter 34 includes a first connecting portion 341, a second connecting portion 342, and a first bent portion 343. The first connecting portion 341 is connected to the electrode tab 21. The first bent portion 343 is connected to one end of the first connecting portion 341 along the second direction Y, close to the pressure relief mechanism 33, and is bent relative to the first connecting portion 341. The second connecting portion 342 is connected to the first bent portion 343 and is located on the side of the first connecting portion 341 facing away from the electrode tab 21. The second connecting portion 342 is connected to the electrode terminal 32. Along the direction from the electrode terminal 32 to the pressure relief mechanism 33, at least a portion of the pressure relief mechanism 33 extends beyond the first bent portion 343.

[0108] Alternatively, the battery cell 110 may include a cylindrical battery cell 110 .

[0109] For example, the housing 10 may be cylindrical, and the openings provided at the ends of the housing 10 along the first direction X may be provided on the bottom and / or top surfaces of the cylindrical structure. Optionally, the housing 10 may be a thin-walled structure.

[0110] Optionally, the shape of the electrode assembly 20 can be matched with the shape of the housing 10. Optionally, the electrode assembly 20 can include an electrode body and a tab 21. The tab 21 can be formed by extending from one or both ends of the electrode body in the first direction X. Of course, the tab 21 can also be formed by extending from one or both ends of the electrode body in the second direction Y. The first direction X and the second direction Y can be perpendicular to each other.

[0111] Optionally, when the shell 10 has two openings along the first direction X, the number of end cover assemblies 30 may include two, and the two end cover assemblies 30 cover the two openings respectively; when the shell 10 has one opening along the first direction X, the number of end cover assemblies 30 may include one, and one end cover assembly 30 covers one opening.

[0112] Optionally, the end cover assembly 30 includes an end cover 31, an electrode terminal 32 and a pressure relief mechanism 33. The end cover 31 can be a plate-like structure. An electrode terminal 32 connection hole and a pressure relief hole can be opened on the end cover 31. The electrode terminal 32 is arranged in the electrode terminal 32 connection hole. The pressure relief mechanism 33 is arranged in the pressure relief hole. The pressure relief hole is located on one side of the electrode terminal 32 connection hole along the second direction Y.

[0113] An insulating member 35 may be provided between the adapter 34 and the end cap 31. One end of the adapter 34 may be attached to the surface of the insulating member 35. The adapter 34 is electrically connected to the electrode terminal 32. For example, the second connecting portion 342 of the adapter 34 is welded to the electrode terminal 32. The first connecting portion 341 of the adapter 34 is welded to the electrode tab 21. The first connecting portion 341 and the second connecting portion 342 may be stacked, and the first bend 343 connects one end of the first connecting portion 341 and the second connecting portion 342 along the second direction Y. Optionally, the first connecting portion 341 and the second connecting portion 342 may be attached to each other. Alternatively, a gap may be provided between the first connecting portion 341 and the second connecting portion 342.

[0114] Optionally, the insulating member 35 disposed on the side of the end cap 31 facing the opening may include a first insulating portion and a second insulating portion, wherein the first insulating portion covers the end cap 31 and the second insulating portion is located on a side of the first insulating portion facing away from the end cap 31, and the side of the second insulating portion facing away from the end cap 31 may be disposed in contact with the electrode assembly 20. Optionally, the second insulating portion may be provided with an escape channel, and a portion of the first connecting portion 341 of the adapter 34 may extend through the escape channel before the adapter 34 is bent.

[0115] Illustratively, the first bending portion 343 is connected to the first connecting portion 341 , and is located at one end close to the pressure relief mechanism 33 along the second direction Y, and is bent relative to the first connecting portion 341 .

[0116] Along the direction from the electrode terminal 32 to the pressure relief mechanism 33, at least part of the pressure relief mechanism 33 exceeds the first bent portion 343. In other words, along the direction from the electrode terminal 32 to the pressure relief mechanism 33, the projection of the first bent portion 343 in the first direction X overlaps with a part of the pressure relief mechanism 33, or the projection of the first bent portion 343 in the first direction X is located on the side of the pressure relief mechanism 33 facing the electrode terminal 32 and does not overlap with the pressure relief mechanism 33.

[0117] In the embodiment of the present application, at least a portion of the pressure relief mechanism 33 is extended beyond the first bent portion 343 along the direction of the electrode terminal 32 pointing to the pressure relief mechanism 33. Since the first bent portion 343 has a two-layer structure, the stiffness of the first bent portion 343 is greater than the stiffness of the periphery of the first connecting portion 341, thereby reducing the risk of the adapter 34 deforming and blocking the pressure relief hole when thermal runaway occurs in the battery cell 110, thereby improving the reliability of the battery cell 110.

[0118] In some optional embodiments, see Figures 4 to 6 The projection of the first bending portion 343 in the first direction X overlaps with the projection of a portion of the pressure relief mechanism 33 in the first direction X.

[0119] Exemplarily, the projection of the first bent portion 343 in the first direction X overlaps with the projection of a portion of the pressure relief mechanism 33 near the electrode terminal 32 in the first direction X.

[0120] In these optional embodiments, the above-mentioned configuration is conducive to increasing the overall size of the adapter 34, thereby increasing the overall current capacity of the adapter 34, improving the power output capacity and cycle stability of the battery cell 110, and improving the reliability of the battery cell 110.

[0121] In some optional embodiments, see Figure 6 In the second direction Y, the end of the first connecting portion 341 away from the first bending portion 343 is spaced apart from the pressure relief mechanism 33.

[0122] In some embodiments, the projection of the second connection portion 342 in the first direction X falls within the projection of the first connection portion 341 in the first direction X. That is, there is no second connection portion 342 between the end of the first connection portion 341 away from the first bend 343 facing the end cap 31 and the end cap 31, thereby enhancing the overall size of the adapter 34. It is understood that the stiffness of the end of the first connection portion 341 away from the first bend 343 is less than the stiffness of the overlapping region of the first and second connection portions 341, 342. Furthermore, the stiffness of the end of the first connection portion 341 away from the first bend 343 is also less than the stiffness of the first bend 343. Through this arrangement in the present embodiment, when thermal runaway of the battery cell 110 occurs, the region of the adapter 34 with lower stiffness than other regions is located away from the pressure relief mechanism 33. This reduces the possibility of the deformed region of the adapter 34 blocking the pressure relief mechanism 33, thereby improving the reliability of the battery cell 110.

[0123] In some other embodiments, the projection of the first connection portion 341 in the first direction X and the projection of the second connection portion 342 in the first direction X are overlapped.

[0124] In some embodiments, the projection of the end of the first connection portion 341 away from the first bending portion 343 along the first direction X and the projection of the pressure relief mechanism 33 along the first direction X are located on opposite sides of the electrode terminal 32 along the second direction Y.

[0125] Illustratively, the projection of the end of the first connecting portion 341 away from the first bent portion 343 along the first direction X and the projection of the pressure relief mechanism 33 along the first direction X are located separately on the central axis of the electrode terminal 32 along the second direction Y. Alternatively, a line connecting the projection of the end of the first connecting portion 341 away from the first bent portion 343 along the first direction X and the projection of the pressure relief mechanism 33 along the first direction X intersects the second direction Y.

[0126] Figure 7 This is a schematic structural diagram of an end cover assembly in a battery cell provided in an embodiment of the present application. Figure 8 This is a schematic structural diagram of another battery cell end cover assembly provided in an embodiment of the present application.

[0127] In some optional embodiments, see Figures 6 to 8 The end cover 31 is provided with a liquid injection hole K1, and the liquid injection hole K1 and the pressure relief mechanism 33 are respectively provided on two opposite sides of the electrode terminal 32 along the second direction Y.

[0128] Alternatively, as Figure 7As shown, the injection hole K1 and the pressure relief mechanism 33 are separately arranged on the central axis of the electrode terminal 32 along the second direction Y, so that the pressure relief hole and the injection hole K1 are separately arranged on both sides of the connecting hole of the electrode terminal 32 along the second direction Y, and the pressure relief hole and the injection hole K1 are located on the central axis of the second direction Y, reducing the risk of deformation of the end cover 31 due to insufficient strength in a local area of ​​the end cover 31, thereby improving the reliability of the battery cell 110.

[0129] Alternatively, as Figure 8 As shown, the line connecting the liquid injection hole K1 and the pressure relief mechanism 33 intersects with the central axis of the electrode terminal 32 along the second direction Y.

[0130] Figure 9 yes Figure 5 Schematic diagram of another enlarged structure of P.

[0131] In some optional embodiments, see Figure 9 The projection of the end of the first connecting portion 341 away from the first bending portion 343 in the first direction X and the projection of the liquid injection hole K1 in the first direction X are at least partially overlapped.

[0132] Optionally, the end of the second connection portion 342 away from the first bend portion 343 is electrically connected to the electrode terminal 32, such that the end of the first connection portion 341 away from the first bend portion 343 extends beyond the end of the second connection portion 342 away from the first bend portion 343 in a direction away from the first bend portion 343 of the electrode terminal 32. The projection of the end of the first connection portion 341 away from the first bend portion 343 in the first direction X may partially overlap with the projection of the injection hole K1 in the first direction X. Alternatively, the projection of the injection hole K1 in the first direction X falls within the projection of the end of the first connection portion 341 away from the first bend portion 343 in the first direction X.

[0133] In these optional embodiments, the above-mentioned configuration is conducive to increasing the size of the first connecting portion 341 , thereby increasing the overall size of the adapter 34 , increasing the overall current carrying capacity of the adapter 34 , and improving the reliability of the battery cell 110 .

[0134] Figure 10 yes Figure 5 Schematic diagram of another enlarged structure of P. Figure 11 yes Figure 5 Schematic diagram of another enlarged structure of P.

[0135] In some optional embodiments, see Figure 10 and Figure 11 The projection of the adapter 34 in the first direction X and the projection of the pressure relief mechanism 33 in the first direction X are not overlapped.

[0136] Alternatively, as Figure 10As shown, the projection of the first bent portion 343 in the first direction X is located between the pressure relief mechanism 33 and the electrode terminal 32 .

[0137] Alternatively, as Figure 11 As shown, the projection of the first bending portion 343 in the first direction X may also overlap with the projection of the electrode terminal 32 in the first direction X.

[0138] In these optional embodiments, the above configuration further reduces the risk of the adapter 34 deforming and blocking the pressure relief hole when thermal runaway occurs in the battery cell 110 , thereby improving the reliability of the battery cell 110 .

[0139] In some optional embodiments, see Figure 10 and Figure 11 The second connection portion 342 includes a first sub-connection portion 3421, a second sub-connection portion 3422, and a second bent portion 3423. The first sub-connection portion 3421 is connected to the second sub-connection portion 3422 via the second bent portion 3423. The first sub-connection portion 3421 is connected to the electrode terminal 32, and the second sub-connection portion 3422 is connected to the first bent portion 343. The first bent portion 343 and the second bent portion 3423 are spaced apart along the second direction Y.

[0140] Alternatively, the adapter 34 may be a continuously bent structure, wherein the first sub-connecting portion 3421, the second sub-connecting portion 3422, and the first connecting portion 341 are sequentially stacked along the direction from the end cap 31 toward the electrode assembly 20, and the projection of the second bent portion 3423 in the first direction X may be located within the projection of the first connecting portion 341 in the first direction X. Alternatively, the adapter 34 may be Z-shaped.

[0141] In the embodiment of the present application, by providing the second bending portion 3423, it is helpful to reduce the difficulty of connecting the adapter 34 and the electrode terminal 32, while reducing the pulling force of the first bending portion 343 on the connection between the first sub-connection portion 3421 and the electrode terminal 32 during the bending process, thereby reducing the possibility of the first bending portion 343 causing the first sub-connection portion 3421 and the electrode terminal 32 to separate during the bending process.

[0142] Figure 12 This is a schematic diagram of the cross-sectional structure of another battery cell provided in an embodiment of the present application.

[0143] In some optional embodiments, see Figure 12 The number of end cover assemblies 30 includes two, and openings are provided at both ends of the shell 10 along the first direction X. The two end cover assemblies 30 respectively cover the openings at both ends, which is conducive to increasing the exhaust channel for pressure relief, thereby improving the pressure relief efficiency and improving the reliability of the battery cell 110.

[0144] In some optional embodiments, see Figure 12 The pressure relief mechanisms 33 in the two end cover assemblies 30 are arranged opposite to each other along the first direction X.

[0145] Optionally, the projections of the pressure relief holes of the two end cover assemblies 30 in the first direction X may be concentric circles. Optionally, the projections of the pressure relief holes of the two end cover assemblies 30 in the first direction X may overlap.

[0146] In these optional embodiments, through the above-mentioned settings, the two exhaust channels for pressure relief are connected along the first direction X. When the emissions are discharged through the exhaust channels, the blockage of one or both of the exhaust channels by the electrode assembly 20 is reduced, while the distance between the electrode assembly 20 and the outer shell set to avoid the obstruction of the electrode assembly 20 is reduced, thereby improving space utilization and increasing energy density.

[0147] Figure 13 This is a schematic diagram of the cross-sectional structure of another battery cell provided in an embodiment of the present application. Figure 14 This is a schematic diagram of the cross-sectional structure of another battery cell provided in an embodiment of the present application.

[0148] In some optional embodiments, see Figure 13 and Figure 14 The adapter 34 further includes a protrusion 344, which extends from the end of the first connecting portion 341 toward the end cover 31. And / or the protrusion 344 extends from the first bending portion 343 toward the end cover 31.

[0149] Optionally, there may be a gap between the protrusion 344 and the end cover 31. Alternatively, the protrusion 344 and the insulating member 35 of the end cover 31 facing the inner side of the opening are abutted against each other.

[0150] In some embodiments, the protrusion 344 extends from the end of the first connecting portion 341 toward one side of the end cap 31. In other embodiments, the protrusion 344 extends from the first bent portion 343 toward one side of the end cap 31. In other embodiments, multiple protrusions 344 are provided, with a portion of the multiple protrusions 344 extending from the end of the first connecting portion 341 toward one side of the end cap 31. Furthermore, another portion of the multiple protrusions extends from the first bent portion 343 toward one side of the end cap 31.

[0151] Optionally, the outer surface of the protrusion 344 may be provided with an insulating material.

[0152] In these optional embodiments, the protrusion 344 can play a supporting role. When the battery cell 110 experiences thermal runaway and the electrode assembly 20 squeezes the adapter 34, the presence of the protrusion 344 can reduce the possibility of deformation of the adapter 34, thereby improving the reliability of the battery cell 110.

[0153] In some optional embodiments, see Figure 14 A conductive adhesive 40 is provided in the first bent portion 343 , thereby improving the overall stiffness of the first bent portion 343 , further reducing the possibility of deformation of the first bent portion 343 when thermal runaway occurs in the battery cell 110 , reducing the possibility of the adapter 34 blocking the pressure relief hole, and improving the reliability of the battery cell 110 .

[0154] In some optional embodiments, see Figure 14 The end cover 31 is provided with a pressure relief hole, and the pressure relief mechanism 33 is arranged in the pressure relief hole. The direction of the electrode terminal 32 pointing to the pressure relief mechanism 33 is such that the centroid of the pressure relief hole exceeds the first bending portion 343.

[0155] Optionally, the centroid of the pressure relief hole may be the geometric center of the pressure relief hole.

[0156] Optionally, along the direction from the electrode terminal 32 to the pressure relief mechanism 33 , the centroid of the pressure relief hole exceeds the first bent portion 343 , that is, half or more of the area of ​​the pressure relief hole does not overlap with the projection of the first bent portion 343 in the first direction X.

[0157] In these optional embodiments, the above-mentioned configuration is helpful in reducing the blocking area of ​​the pressure relief hole by the adapter 34, thereby reducing the possibility of the adapter 34 blocking the pressure relief hole when the battery cell 110 experiences thermal runaway, and improving the reliability of the battery cell 110.

[0158] In a second aspect, an embodiment of the present application provides a battery device 100 , comprising a battery cell 110 in any of the aforementioned embodiments.

[0159] In a third aspect, an embodiment of the present application provides an electrical device, comprising the battery device 100 in any of the aforementioned embodiments, and the battery device is used to provide electrical energy.

[0160] According to some embodiments of this application, please refer to Figure 6 、 Figure 7 as well as Figure 12The battery cell 110 includes a housing 10, an electrode assembly 20, and an end cap assembly 30. The housing 10 has an opening at its end along the first direction X. The electrode assembly 20 is housed within the housing 10 and includes a tab 21. The end cap assembly 30 covers the opening and includes an end cap 31, an electrode terminal 32, a pressure relief mechanism 33, and an adapter 34. The end cap 31 is connected to the housing 10, and the electrode terminal 32 and the pressure relief mechanism 33 are disposed on the end cap 31. The pressure relief mechanism is located on one side of the electrode terminal 32 along the second direction Y. The first direction X is perpendicular to the second direction Y. The adapter 34 includes a first connecting portion 341, a second connecting portion 342, and a first bent portion 343. The first connecting portion 341 is connected to the electrode tab 21. The first bent portion 343 is connected to one end of the first connecting portion 341 along the second direction Y close to the pressure relief mechanism 33 and is bent relative to the first connecting portion 341. The second connecting portion 342 is connected to the first bent portion 343 and is located on the side of the first connecting portion 341 facing away from the electrode tab 21. The second connecting portion 342 is connected to the electrode terminal 32. Along the direction from the electrode terminal to the pressure relief mechanism 33, at least a portion of the pressure relief mechanism extends beyond the first bent portion 343. The second connection portion 342 includes a first sub-connection portion 3421, a second sub-connection portion 3422, and a second bent portion 3423. The first sub-connection portion 3421 is connected to the second sub-connection portion 3422 via the second bent portion 3423. The first sub-connection portion 3421 is connected to the electrode terminal 32, and the second sub-connection portion 3422 is connected to the first bent portion 343. The first bent portion 343 and the second bent portion 3423 are spaced apart along the second direction Y.

[0161] The projection of the first bent portion 343 in the first direction X overlaps with the projection of a portion of the pressure relief mechanism 33 in the first direction X. The end cap 31 is provided with a liquid injection hole K1 , and the liquid injection hole and the pressure relief mechanism 33 are respectively provided on opposite sides of the electrode terminal 32 along the second direction Y.

[0162] The projection of the end of the first connecting portion 341 away from the first bending portion 343 in the first direction X and the projection of the liquid injection hole K1 in the first direction X at least partially overlap.

[0163] There are two end cap assemblies 30 . The housing 10 has openings at both ends along the first direction X. The two end cap assemblies 30 cover the openings at both ends respectively. The pressure relief mechanisms 33 in the two end cap assemblies 30 are arranged opposite to each other along the first direction X.

[0164] The end cap 31 is provided with a pressure relief hole, and the pressure relief mechanism 33 is disposed in the pressure relief hole. The centroid of the pressure relief hole exceeds the first bent portion 343 along the direction of the electrode terminal 32 pointing to the pressure relief mechanism 33 .

[0165] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, characterized in that: include: The housing has an opening at an end portion along the first direction; An electrode assembly is housed in the housing, wherein the electrode assembly includes a tab; an end cap assembly covering the opening, the end cap assembly comprising an end cap, an electrode terminal, a pressure relief mechanism, and an adapter, the end cap being connected to the housing, the electrode terminal and the pressure relief mechanism being disposed on the end cap, the pressure relief mechanism being located on one side of the electrode terminal along a second direction, the first direction being perpendicular to the second direction, The adapter comprises a first connecting portion, a second connecting portion, and a first bending portion, wherein the first connecting portion is connected to the electrode tab, the first bending portion is connected to one end of the first connecting portion close to the pressure relief mechanism along the second direction and is bent relative to the first connecting portion, the second connecting portion is connected to the first bending portion and is located on a side of the first connecting portion facing away from the electrode tab, and the second connecting portion is connected to the electrode terminal; Along the direction from the electrode terminal to the pressure relief mechanism, at least a portion of the pressure relief mechanism exceeds the first bent portion. The end cover is provided with a liquid injection hole, and the liquid injection hole and the pressure relief mechanism are respectively provided on two opposite sides of the electrode terminal along the second direction.

2. The battery cell according to claim 1, wherein: The projection of the first bending portion in the first direction overlaps with the projection of a portion of the pressure relief mechanism in the first direction.

3. The battery cell according to claim 1, wherein: In the second direction, an end portion of the first connecting portion away from the first bending portion is spaced apart from the pressure relief mechanism.

4. The battery cell according to claim 3, characterized in that A projection of an end portion of the first connecting portion away from the first bending portion in the first direction and a projection of the liquid injection hole in the first direction are at least partially overlapped.

5. The battery cell according to claim 1, characterized in that The projection of the adapter in the first direction and the projection of the pressure relief mechanism in the first direction are arranged not to overlap.

6. The battery cell according to claim 1, characterized in that The second connection portion includes a first sub-connection portion, a second sub-connection portion, and a second bending portion, wherein the first sub-connection portion is connected to the second sub-connection portion via the second bending portion, the first sub-connection portion is connected to the electrode terminal, and the second sub-connection portion is connected to the first bending portion; Wherein, the first bending portion and the second bending portion are spaced apart along the second direction.

7. The battery cell according to claim 1, characterized in that The number of the end cover assemblies includes two, and both ends of the shell along the first direction are provided with openings, and the two end cover assemblies respectively cover the openings at both ends.

8. The battery cell according to claim 7, characterized in that The pressure relief mechanisms in the two end cover assemblies are arranged opposite to each other along a first direction.

9. The battery cell according to claim 1, characterized in that The adapter further includes a protrusion, which extends from the end of the first connecting portion toward the end cover; and / or, The protrusion extends from a side of the first bending portion toward the end cover toward the end cover.

10. The battery cell according to claim 1, characterized in that Conductive glue is provided in the first bending portion.

11. The battery cell according to claim 1, wherein The end cover is provided with a pressure relief hole, the pressure relief mechanism is provided in the pressure relief hole, and the centroid of the pressure relief hole exceeds the first bending portion along the direction of the electrode terminal pointing to the pressure relief mechanism.

12. A battery device, characterized in that: The battery cell comprises the battery cell according to any one of claims 1 to 11.

13. An electrical device, characterized in that: The battery device according to claim 12 is used to provide electrical energy.

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