Battery cell, battery device, and electric device
By setting a transition wall in the battery cell housing and transferring the virtual space to the outside, the corner space problem that cannot be utilized in the prism battery cell is solved, and the energy density and structural stability of the battery cell and the battery device are improved.
Patent Information
- Application Number
- CN202421656848.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-12
- Publication Date
- 2025-09-05
- Estimated Expiration
- 2034-07-12
AI Technical Summary
How to improve the energy density of battery cells, especially for the waste of internal space caused by unusable corner space in prism-shaped battery cells.
By providing a transition wall in the housing of the battery cell, the virtual space formed by the extension surface of the first and second walls is transferred to the outside of the battery cell to the outside of the battery cell, and a pressure relief mechanism is provided on the transition wall, and a space outside the transition wall is used as the open space of the pressure relief mechanism to reduce additional space requirements.
The space utilization and energy density inside the battery cell are improved, and the virtual space is rationally utilized in the battery device, which enhances the energy density and structural stability of the battery device.
Smart Images
Figure CN223309084U_ABST
Abstract
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, laptop computers, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes and power tools, etc.
[0003] In the development of battery cell technology, in addition to improving the performance of battery cells, the energy density of battery cells is also an issue that needs to be considered. Therefore, how to improve the energy density of battery cells is an issue that needs to be continuously improved in battery cell technology. Utility Model Content
[0004] The present application provides a battery cell, a battery device, and an electrical device to improve the energy density of the battery cell.
[0005] This application is achieved through the following technical solutions:
[0006] In a first aspect, an embodiment of the present application provides a battery cell comprising a housing and an electrode assembly. The housing comprises a first wall, a second wall, and a transition wall. The normal of the first wall intersects the normal of the second wall. The transition wall connects the first wall and the second wall. The surface area of one side of the transition wall along its thickness direction is smaller than the surface area of the first wall along its thickness direction. The electrode assembly is accommodated within the housing.
[0007] The battery cell provided in the embodiment of the present application is advantageous in reducing the distance between the shell and the electrode assembly by providing a shell including a transition wall, and providing the transition wall to connect the first wall and the second wall, so as to transfer the virtual space that cannot be used by the battery cell and is formed by the extended surface of the outer surface of the first wall and the second wall and the transition wall to the outside of the battery cell, which is advantageous in improving the space utilization inside the battery cell and further improving the energy density of the battery cell. After the battery cells are assembled into a battery device, the virtual space can be used to set related components, so as to facilitate the rational use of the space inside the battery device and facilitate the improvement of the energy density of the battery device.
[0008] According to some embodiments of the present application, the battery cell further includes a pressure relief mechanism, which is provided on the transition wall.
[0009] In the above solution, by arranging the pressure relief mechanism on the transition wall, the virtual space outside the transition wall can be used as the opening space of the pressure relief mechanism. In this way, there is no need to reserve more opening space for the pressure relief mechanism, which is beneficial to improving the energy density of the battery device.
[0010] According to some embodiments of the present application, the transition wall is arc-shaped or straight.
[0011] In the above scheme, the specific shape of the transition wall can be set according to the specific shape of the relative parts of the electrode assembly and the transition wall, so that the space between the transition wall and the electrode assembly is as small as possible, so as to transfer as much space inside the battery cell as possible to the outside of the battery cell, which is conducive to further improving the space utilization inside the battery cell, improving the energy density of the battery cell, and further improving the energy density of the battery device.
[0012] According to some embodiments of the present application, the first wall, the second wall, and the transition wall are integrally formed.
[0013] In the above solution, the first wall, the second wall and the transition wall are integrally formed, which facilitates the processing and forming of the shell and is beneficial to improving the structural strength of the shell.
[0014] According to some embodiments of the present application, the shell includes two first walls opposite to each other along a first direction and two second walls opposite to each other along a second direction. The shell includes multiple transition walls, and a transition wall is provided between any adjacent first walls and second walls.
[0015] In the above solution, more unusable space inside the battery cell can be transferred to the outside of the battery cell, which is beneficial to further improve the space utilization inside the battery cell and further improve the energy density of the battery cell.
[0016] According to some embodiments of the present application, the electrode assembly includes an electrode body and a tab, the tab being extended from the end of the electrode body along the third direction, and the first direction, the second direction and the third direction are perpendicular to each other.
[0017] In the above solution, the processing of the first wall, the second wall and the transition wall is facilitated, and the structural stability of the shell is improved.
[0018] According to some embodiments of the present application, the electrode body includes two first surfaces opposite to each other along a first direction and two second surfaces opposite to each other along a second direction, the first surface connects the two second surfaces, the first wall is arranged one-to-one opposite to the first surface, and the second wall is arranged one-to-one opposite to the second surface.
[0019] In the above solution, setting the transition wall at the intersection of the first surface and the second surface of the electrode body is further conducive to transferring the unusable space inside the battery cell to the outside of the battery cell, which is conducive to improving the energy density of the battery cell.
[0020] According to some embodiments of the present application, the second surface is arc-shaped, and at least a portion of the transition wall is disposed opposite to the second surface.
[0021] In the above scheme, there is a large space between the second surface and the second wall. By setting at least a portion of the transition wall opposite to the second surface, it is beneficial to reduce the size of the space between the outer shell and the second surface, and further help to improve the space utilization inside the battery cell, thereby improving the energy density of the battery cell.
[0022] According to some embodiments of the present application, the second surface is arc-shaped, the distance between the two first walls along the first direction is T, the battery cell includes n electrode assemblies arranged along the first direction, and the dimension L1 of the transition wall along the first direction satisfies: And / or, the dimension L2 of the transition wall along the second direction satisfies:
[0023] In the above scheme, set This is beneficial to reduce the risk of interference between the transition wall and the electrode assembly. It is also beneficial to reduce the risk of interference between the transition wall and the electrode assembly.
[0024] According to some embodiments of the present application, the electrode assembly is cylindrical.
[0025] In the above scheme, there is a large unusable space between the cylindrical electrode assembly and the prismatic shell. By setting a transition wall, the distance between the shell and the electrode assembly can be reduced, which is beneficial to improving the space utilization inside the battery cell and thus improving the energy density of the battery cell.
[0026] In a second aspect, the battery device provided in an embodiment of the present application includes the battery cell provided in any of the above embodiments.
[0027] The battery device provided in the embodiment of the present application has the same technical effects as any of the battery cells provided in any of the above embodiments, and thus will not be described in detail here.
[0028] In a third aspect, the electrical device provided in the embodiments of the present application includes the battery device provided in the above embodiments, and the battery device is used to provide electrical energy.
[0029] The electric device provided in the embodiment of the present application has the same technical effects as the battery device 10 provided in the above embodiment, and thus will not be described in detail here.
[0030] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS
[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.
[0032] Figure 1 A schematic diagram of the structure of a vehicle provided in an embodiment of the present application;
[0033] Figure 2 A schematic diagram of the structure of a battery device provided in an embodiment of the present application;
[0034] Figure 3 A schematic structural diagram of a battery module in a battery device according to an embodiment of the present application;
[0035] Figure 4 A schematic diagram of the explosion structure of a battery cell provided in an embodiment of the present application;
[0036] Figure 5 A schematic structural diagram of the housing and pressure relief mechanism of a battery cell provided in an embodiment of the present application;
[0037] Figure 6 A front view of a battery cell provided in an embodiment of the present application;
[0038] Figure 7 for Figure 6 Schematic diagram of the cross-sectional structure along AA;
[0039] Figure 8 A schematic structural diagram of a battery cell provided in an embodiment of the present application.
[0040] In the drawings, the figures are not necessarily drawn to scale.
[0041] Description of reference numerals:
[0042] 1- Vehicle;
[0043] 10-battery device; 111-first sub-box; 112-second sub-box; 11-box; 1a-motor; 1b-controller;
[0044] 20-battery module;
[0045] 30 - battery cell; 31 - housing; 311 - shell; 312 - end cap; 313 - first wall; 314 - second wall; 315 - transition wall; 32 - electrode assembly; 321 - electrode body; 321a - first surface; 321b - second surface; 322 - tab; S - virtual space;
[0046] 40-pressure relief mechanism;
[0047] X-first direction; Y-second direction; Z-third direction. DETAILED DESCRIPTION
[0048] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.
[0049] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application 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 drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.
[0050] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the 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 in this application may be combined with other embodiments.
[0051] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.
[0052] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.
[0053] The term "multiple" in this application 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).
[0054] 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.
[0055] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells. For example, the battery cell assembly may be a battery module, which is a battery module formed by arranging and securing multiple battery cells to form a single module. For example, a battery module may be formed by bundling multiple battery cells using cable ties.
[0056] 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.
[0057] 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.
[0058] 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.
[0059] 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.
[0060] In some embodiments, the battery device may be an energy storage device, including an energy storage container, an energy storage cabinet, and the like.
[0061] 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.
[0062] The battery cells may be, but are not limited to, 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, and the like.
[0063] A battery cell typically includes an electrode assembly. This assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of a battery cell, active ions (such as lithium ions) are inserted and removed between the positive and negative electrodes. The separator, located between the positive and negative electrodes, prevents short circuits between the positive and negative electrodes while allowing the active ions to pass through.
[0064] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.
[0065] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is provided on either or both of the two facing surfaces of the positive electrode current collector.
[0066] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, stainless steel, stainless steel, copper, aluminum, carbon electrode, carbon, nickel or titanium with a silver-plated surface may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).
[0067] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for battery cells may also be used.
[0068] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.
[0069] As an example, the negative electrode current collector may be a metal foil or a composite current collector. For example, the metal foil may be silver-plated aluminum, silver-plated stainless steel, stainless steel, copper, aluminum, carbon electrode, carbon, nickel, or titanium.
[0070] In some embodiments, the negative electrode current collector has two opposite surfaces in its thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.
[0071] As an example, the negative electrode active material may adopt the negative electrode active material for battery cells that is well known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for battery cells may also be used. These negative electrode active materials may be used alone or in combination of two or more.
[0072] In some embodiments, the diaphragm is an isolation membrane. The present application has no particular limitation on the type of isolation membrane, and any known isolation membrane with a porous structure having good chemical stability and mechanical stability can be selected.
[0073] As an example, the primary material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a separate component positioned between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes.
[0074] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode, and serves to transport ions and isolate the positive and negative electrodes.
[0075] 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.
[0076] In some embodiments, the electrode assembly is a laminate structure.
[0077] In some embodiments, a battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing may be a steel housing, an aluminum housing, a plastic housing (e.g., polypropylene), a composite metal housing (e.g., a copper-aluminum composite housing), or an aluminum-plastic film.
[0078] In some embodiments, the housing includes an end cap and a shell. The shell has an opening, and the end cap closes the opening to form a sealed space for accommodating the electrode assembly, electrolyte, and other substances. The shell may have one or more openings. One or more end caps may also be provided.
[0079] In some embodiments, the housing is provided with at least one electrode terminal, which is electrically connected to a tab of the electrode assembly. The electrode terminal may be directly connected to the tab or indirectly connected to the tab via a current collector. The electrode terminal may be provided on an end cap or on the housing.
[0080] In some embodiments, the housing is provided with an explosion-proof valve for releasing the internal pressure of the battery cell.
[0081] As an example, the battery cell may be a prismatic battery cell, which includes a square-shell battery cell, a blade-shaped battery cell, and a polygonal battery cell. The polygonal battery cell may be, for example, a hexagonal battery cell, etc. There is no particular limitation in the embodiments of the present application.
[0082] For some prismatic battery cells, their shells usually include a first wall and a second wall that intersect each other. The intersecting first wall and second wall form a corner space inside the shell. This corner space usually cannot be utilized, which easily causes waste of the internal space of the battery cell and seriously affects the improvement of the battery's energy density.
[0083] In view of this, the battery cell provided in this application includes a housing and an electrode assembly. The housing includes a first wall, a second wall, and a transition wall. The normal of the first wall intersects the normal of the second wall. The transition wall connects the first wall and the second wall. The surface area of one side of the transition wall along its thickness direction is smaller than the surface area of the first wall along its thickness direction. The electrode assembly is accommodated in the housing.
[0084] The battery cell provided in the embodiment of the present application is advantageous in reducing the distance between the outer shell and the electrode assembly by providing an outer shell including a transition wall, and providing the transition wall to connect the first wall and the second wall, so as to transfer the virtual space that cannot be used by the battery cell and is formed by the extended surface of the outer surface of the first wall and the second wall and the transition wall to the outside of the battery cell, which is advantageous in improving the space utilization inside the battery cell and further improving the energy density of the battery cell. After the battery cells are assembled into a battery device, the virtual space can be used to set related components, so as to facilitate the rational use of the space inside the battery device and facilitate improving the energy density of the battery device.
[0085] The technical solutions described in the embodiments of the present application are applicable to battery cells, battery devices including battery cells, and electrical devices using the battery devices.
[0086] The battery device disclosed in the embodiments of the present application can be used, but is not limited to, in electrical devices such as vehicles, ships, or aircraft. The battery device disclosed in the present application can be used to form a power supply system for the electrical device.
[0087] The embodiments of the present application provide an electrical device that uses a battery device as a power source. The electrical device may be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, an electric bicycle, an electric motorcycle, an electric car, a ship, a spacecraft, etc. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.
[0088] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device according to an embodiment of the present application.
[0089] Please refer to Figure 1 , Figure 1 Schematic diagram of the structure of the vehicle 1 provided in an embodiment of the present application. The vehicle 1 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. A battery device 10 is provided inside the vehicle 1. The battery device 10 can be provided at the bottom, head, or tail of the vehicle 1. The battery device 10 can be used to power the vehicle 1. For example, the battery device 10 can serve as an operating power source for the vehicle 1 and can be used for the circuit system of the vehicle 1, such as for the working power requirements of the vehicle 1 during startup, navigation, and operation.
[0090] The vehicle 1 may further include a controller 1 b and a motor 1 a . The controller 1 b is used to control the battery device 10 to supply power to the motor 1 a , for example, to meet the power requirements of the vehicle 1 during startup, navigation, and driving.
[0091] In some embodiments of the present application, the battery device 10 can serve not only as an operating power source for the vehicle 1 , but also as a driving power source for the vehicle 1 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1 .
[0092] Please refer to Figure 2 and Figure 3 , Figure 2 This is a schematic diagram of the structure of the battery device 10 provided in an embodiment of the present application. Figure 3This is a schematic diagram of the structure of the battery module 20 in the battery device 10 provided in an embodiment of the present application. The battery device 10 includes a housing 11 and a battery cell 30, with the battery cell 30 housed within the housing 11. The housing 11 is used to provide a storage space for the battery cell 30, and the housing 11 can adopt a variety of structures. In some embodiments, the housing 11 can include a first sub-housing 111 and a second sub-housing 112, which cover each other and together define a storage space for accommodating the battery cell 30. The second sub-box 112 can be a hollow structure with one end open, and the first sub-box 111 can be a plate-like structure. The first sub-box 111 covers the open side of the second sub-box 112, so that the first sub-box 111 and the second sub-box 112 jointly define a storage space; the first sub-box 111 and the second sub-box 112 can also be hollow structures with one side open, and the open side of the first sub-box 111 covers the open side of the second sub-box 112.
[0093] In the battery device 10, there may be multiple battery cells 30, which may be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections among the multiple battery cells 30. The multiple battery cells 30 may be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery module 20 may be housed within the housing 11. Alternatively, the battery device 10 may comprise multiple battery cells 30 connected in series, in parallel, or in a hybrid connection to form a battery module 20, which is then connected in series, in parallel, or in a hybrid connection to form a single unit housed within the housing 11. The battery device 10 may also include other structures, such as a busbar assembly for electrically connecting the multiple battery cells 30.
[0094] The battery cell 30 may be a secondary battery or a primary battery; the battery cell 30 may also be a lithium-sulfur battery cell, a sodium-ion battery cell or a magnesium-ion battery cell, but is not limited thereto.
[0095] Please refer to Figure 4 , Figure 4 Schematic diagram of the explosion structure of the battery cell 30 provided in the embodiment of the present application. Figure 4 As shown, the battery cell 30 includes a housing 31, an electrode assembly 32, and electrode terminals. The housing 31 includes a shell 311 and an end cap 312. The shell 311 has an opening, and the end cap 312 closes the opening to isolate the internal environment of the battery cell 30 from the external environment.
[0096] The housing 311 is a component used to cooperate with the end cap 312 to form the internal environment of the battery cell 30, wherein the formed internal environment can be used to accommodate the electrode assembly 32, electrolyte, and other components. The housing 311 and the end cap 312 can be independent components. The housing 311 can be of various shapes and sizes. Specifically, the shape of the housing 311 can be determined according to the specific shape and size of the electrode assembly 32. The housing 311 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.
[0097] The end cap 312 is a component that covers the opening of the housing 311 to isolate the internal environment of the battery cell 30 from the external environment. The shape of the end cap 312 can be adapted to the shape of the housing 311 to fit the housing 311. Optionally, the end cap 312 can be made of a material with a certain hardness and strength (such as an aluminum alloy). This prevents the end cap 312 from deforming when subjected to compression or collision, thereby providing the battery cell 30 with greater structural strength and improved reliability. Functional components such as electrode terminals can be provided on the end cap 312. The electrode terminals can be used to electrically connect to the electrode assembly 32 to output or input electrical energy to the battery cell 30. The end cap 312 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this is not particularly limited in this embodiment of the present application. In some embodiments, an insulating structure can be provided on the inside of the end cap 312 to isolate the electrical connection components within the housing 311 from the end cap 312 to reduce the risk of short circuits. For example, the insulating structure may be plastic, rubber, or the like.
[0098] The electrode assembly 32 is the component in the battery cell 30 where the electrochemical reaction occurs. The housing 311 may contain one or more electrode assemblies 32. The electrode assembly 32 is primarily formed by winding or stacking positive and negative electrode sheets, and typically a separator is provided between the positive and negative electrode sheets. The separator is used to separate the positive and negative electrode sheets to reduce the risk of internal short circuits between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active material can serve as at least part of the electrode body 321 of the electrode assembly 32, and the portions of the positive and negative electrode sheets without active material can serve as at least part of the tabs 322. The positive and negative tabs can be located together at one end of the electrode body 321 or separately at opposite ends of the electrode body 321. During the charge and discharge process of the battery cell 30, the positive and negative electrode active materials react with the electrolyte, and the tabs 322 connect to the electrode terminals to form a current loop.
[0099] First, as Figure 4 、 Figure 5 、 Figure 6 and Figure 7As shown, the battery cell 30 provided in this application includes a housing 31 and an electrode assembly 32. The housing 31 includes a first wall 313, a second wall 314, and a transition wall 315. The normal direction of the first wall 313 intersects the normal direction of the second wall 314. The transition wall 315 connects the first wall 313 and the second wall 314. The surface area of the transition wall 315 along its thickness direction is smaller than the surface area of the first wall 313 along its thickness direction. The electrode assembly 32 is accommodated in the housing 31.
[0100] The shell 31 includes a first wall 313 and a second wall 314 . The shell 31 may be in a polygonal column shape. Optionally, the first wall 313 and the shell 31 may include one or more first walls 313 . Similarly, the shell 31 may include one or more second walls 314 .
[0101] When the shell 31 includes multiple first walls 313 and multiple second walls 314, a transition wall 315 can be connected between any adjacent first walls 313 and second walls 314, or a transition wall 315 can be connected between some of the adjacent first walls 313 and second walls 314.
[0102] The normal directions of the first wall 313 and the second wall 314 may be perpendicular to the outer surfaces of the first wall 313 and the second wall 314, respectively. That is, the normal direction of the first wall 313 may be the thickness direction of the first wall 313, and the normal direction of the second wall 314 may be the thickness direction of the second wall 314. When the normal direction of the first wall 313 and the normal direction of the second wall 314 intersect, the extended surface of the outer surface of the first wall 313 and the extended surface of the outer surface of the second wall 314 intersect.
[0103] The outer surface of the first wall 313 and the extended surface of the outer surface of the second wall 314 may intersect at a right angle or an obtuse angle.
[0104] The transition wall 315 connects the first wall 313 and the second wall 314 . Optionally, the transition wall 315 may be in an arc shape. Alternatively, the transition wall 315 may be in an arc shape.
[0105] The surface area of the transition wall 315 on one side along its own thickness direction is smaller than the surface area of the first wall 313 on one side along its own thickness direction. The circumferential dimension of the transition wall 315 surrounding the first wall 313, the second wall 314 and the transition wall 315 along the outer shell 31 is smaller than the circumferential dimension of the first wall 313 along the outer shell 31. The transition wall 315 can be regarded as a chamfered portion of the first wall 313 and the second wall 314.
[0106] Optionally, the surface area of the transition wall 315 on one side along its own thickness direction can be smaller than, larger than, or equal to the surface area of the second wall 314 on one side along its own thickness direction. In other words, the size of the transition wall 315 along the circumference of the shell 31 can be larger than, smaller than, or equal to the size of the second wall 314 along the circumference of the shell 31.
[0107] The electrode assembly 32 is accommodated in the housing 31 , and the electrode assembly 32 can be wound and formed, and the electrode assembly 32 can be cylindrical, or the electrode assembly 32 can be polyhedron.
[0108] It can be understood that by setting the transition wall 315, the virtual space S that cannot be used inside the battery cell 30 and is formed by the extended surface of the outer surface of the first wall 313 and the second wall 314 and the transition wall 315 is transferred from the inside of the battery cell 30 to the outside of the battery cell 30, which is beneficial to improving the space utilization rate of the battery cell 30. After the battery cells 30 are grouped, the virtual space S can be used to set related components, which is beneficial to fully utilize the space inside the battery device 10.
[0109] The housing 31 may include a shell 311 and an end cover 312 , and the first wall 313 and the second wall 314 may both be part of the shell 311 , or one of the first wall 313 and the second wall 314 may be part of the shell 311 and the other may be at least part of the end cover 312 .
[0110] The battery cell 30 provided in the embodiment of the present application is advantageous in reducing the distance between the outer shell 31 and the electrode assembly 32 by providing the outer shell 31 including a transition wall 315, and providing the transition wall 315 to connect the first wall 313 and the second wall 314, so as to transfer the virtual space S that cannot be used by the battery cell 30 and is formed by the extended surface of the outer surface of the first wall 313 and the second wall 314 and the transition wall 315 to the outside of the battery cell 30, which is advantageous in improving the space utilization rate inside the battery cell 30 and thereby improving the energy density of the battery cell 30. After the battery cells 30 are assembled into the battery device 10, the virtual space S can be used to set related components, so as to facilitate the rational use of the space inside the battery device 10 and facilitate improving the energy density of the battery device 10.
[0111] Optionally, the battery cell 30 may further include a pressure relief mechanism 40 . In an embodiment where the first wall 313 , the second wall 314 , and the transition wall 315 are all part of the housing 311 , the pressure relief mechanism 40 may be provided on the end cover 312 .
[0112] In some embodiments, as Figure 5 As shown, the battery cell 30 further includes a pressure relief mechanism 40 , which is disposed on the transition wall 315 .
[0113] The pressure relief mechanism 40 may be opened when the internal pressure of the battery cell 30 reaches a set threshold value to relieve the pressure of the battery cell 30 and reduce the risk of thermal runaway of the battery cell 30 .
[0114] The pressure relief mechanism 40 requires a certain amount of space to open, so a certain amount of space must be reserved outside the battery cell 30 for the pressure relief mechanism 40 to open. However, in the embodiment of the present application, by locating the pressure relief mechanism 40 within the transition wall 315, the virtual space S outside the transition wall 315 can be used as the opening space for the pressure relief mechanism 40. This eliminates the need to reserve additional space for the pressure relief mechanism 40 to open, thereby improving the energy density of the battery device 10.
[0115] In some embodiments, the transition wall 315 is arc-shaped or straight.
[0116] Specifically, the specific shape of the transition wall 315 can be set according to the specific shapes of the relative parts of the electrode assembly 32 and the transition wall 315, so that the space between the transition wall 315 and the electrode assembly 32 is as small as possible, so as to transfer as much space inside the battery cell 30 as possible to the outside of the battery cell 30, which is beneficial to further improve the space utilization inside the battery cell 30, improve the energy density of the battery cell 30, and further improve the energy density of the battery device 10.
[0117] Optionally, the first wall 313, the second wall 314 and the transition wall 315 can be integrally formed, or the first wall 313, the second wall 314 and the transition wall 315 can be formed separately and then connected together, which can be arranged according to actual needs.
[0118] In some embodiments, the first wall 313 , the second wall 314 and the transition wall 315 are integrally formed.
[0119] The first wall 313 , the second wall 314 and the transition wall 315 can be formed by a plate-like structure through a bending process to form the first wall 313 , the second wall 314 and the transition wall 315 , respectively.
[0120] The first wall 313 , the second wall 314 and the transition wall 315 are integrally formed, which facilitates the processing and forming of the shell 31 and helps to improve the structural strength of the shell 31 .
[0121] In some embodiments, as Figure 4 and Figure 5 As shown, the housing 31 includes two first walls 313 opposite to each other along a first direction X and two second walls 314 opposite to each other along a second direction Y. The housing 31 includes a plurality of transition walls 315 , with a transition wall 315 provided between any adjacent first walls 313 and second walls 314 .
[0122] In this way, more unusable space inside the battery cell 30 can be transferred to the outside of the battery cell 30 , which is beneficial to further improve the space utilization inside the battery cell 30 and further improve the energy density of the battery cell 30 .
[0123] In some embodiments, as Figure 4 As shown, the electrode assembly 32 includes an electrode body 321 and a tab 322 . The tab 322 is extended from the end of the electrode body 321 along the third direction Z. The first direction X, the second direction Y and the third direction Z are perpendicular to each other.
[0124] In this way, the first wall 313 , the second wall 314 and the transition wall 315 are respectively arranged opposite to the electrode body 321 , and the first wall 313 , the second wall 314 and the transition wall 315 can respectively be part of the shell 311 of the housing 31 .
[0125] Such a configuration facilitates the processing of the first wall 313 , the second wall 314 and the transition wall 315 , and helps to improve the structural stability of the housing 31 .
[0126] In some embodiments, as Figure 4 As shown, the electrode body 321 includes two first surfaces 321a opposite to each other along the first direction X and two second surfaces 321b opposite to each other along the second direction Y. The first surface 321a connects the two second surfaces 321b. The first wall 313 is arranged one-to-one opposite to the first surface 321a, and the second wall 314 is arranged one-to-one opposite to the second surface 321b.
[0127] The first surface 321 a connects the two second surfaces 321 b . The first surface 321 a may be straight or arc-shaped, and the second surface 321 b may be arc-shaped or straight.
[0128] Alternatively, the electrode assembly 32 may be arranged in a wound form, or the electrode assembly 32 may be arranged in a stacked form.
[0129] The first wall 313 is arranged one-to-one opposite to the first surface 321a, and the second wall 314 is arranged one-to-one opposite to the second surface 321b, then the transition wall 315 can be opposite to the intersection of the first surface 321a and the second surface 321b. In other words, setting the transition wall 315 at the intersection of the first surface 321a and the second surface 321b of the electrode body 321 is further beneficial to transfer the unusable space inside the battery cell 30 to the outside of the battery cell 30, which is beneficial to improve the energy density of the battery cell 30.
[0130] In some embodiments, as Figure 4 、 Figure 6 and Figure 7As shown, the second surface 321 b is arc-shaped, and at least a portion of the transition wall 315 is disposed opposite to the second surface 321 b.
[0131] Since the second surface 321b is arc-shaped and the second surface 321b is arranged opposite to the second wall 314, there is a large space between the second surface 321b and the second wall 314. By setting at least a portion of the transition wall 315 opposite to the second surface 321b, it is beneficial to reduce the size of the space between the outer shell 31 and the second surface 321b, which is further beneficial to improve the space utilization inside the battery cell 30, thereby improving the energy density of the battery cell 30.
[0132] In some embodiments, Figure 7 and Figure 8 As shown, the second surface 321b is arc-shaped, the distance between the two first walls 313 along the first direction X is T, the battery cell 30 includes n electrode assemblies 32 arranged along the first direction X, and the dimension L1 of the transition wall 315 along the first direction X satisfies: And / or, the dimension L2 of the transition wall 315 along the second direction Y satisfies:
[0133] The second surface 321b is in an arc shape. Assuming that the radius of the second surface 321b is R, the distance between the two first surfaces 321a of an electrode assembly 32 can be 2R. In the case where the battery cell 30 includes n electrode assemblies 32 arranged along the first direction X, 2nR=T, then R=T / 2n. When the angle between the transition wall 315 and the first wall 313 and the second wall 314 is 135°, as shown in the figure, α=45°, OC=R, then
[0134] That is, when the transition wall 315 does not interfere with the electrode assembly 32, the maximum values allowed for L1 and L2 are Therefore, setting This is beneficial to reducing the risk of interference between the transition wall 315 and the electrode assembly 32. It is also beneficial to reduce the risk of interference between the transition wall 315 and the electrode assembly 32.
[0135] In some embodiments, the electrode assembly 32 is cylindrical.
[0136] There is a large unusable space between the cylindrical electrode assembly 32 and the prismatic shell 31. By setting a transition wall 315, the distance between the shell 31 and the electrode assembly 32 can be reduced, which is beneficial to improving the space utilization inside the battery cell 30 and thereby improving the energy density of the battery cell 30.
[0137] In a second aspect, the battery device 10 provided in an embodiment of the present application includes the battery cell 30 provided in any of the above embodiments.
[0138] The battery device 10 provided in the embodiment of the present application has the same technical effects as the battery cell 30 provided in any of the above embodiments, and thus will not be described in detail here.
[0139] In a third aspect, the electrical device provided in the embodiment of the present application includes the battery device 10 provided in the above embodiment, and the battery device 10 is used to provide electrical energy.
[0140] The electric device provided in the embodiment of the present application has the same technical effects as the battery device 10 provided in the above embodiment, and thus will not be described in detail here.
[0141] In some embodiments, as Figures 4 to 8 As shown, the battery cell 30 includes a housing 31, a pressure relief mechanism 40, and an electrode assembly 32. The housing 31 includes two first walls 313 opposing each other along a first direction X, two second walls 314 opposing each other along a second direction Y, and a transition wall 315 connecting the first walls 313 and the second walls 314. The first walls 313, the second walls 314, and the transition wall 315 are integrally formed. The electrode assembly 32 is housed within the housing 31 and includes an electrode body 321 and a tab 322. The tab 322 extends from the end of the electrode body 321 along a third direction Z. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other. The electrode assembly 32 includes two first surfaces 321a that oppose each other along a first direction X and two second surfaces 321b that oppose each other along a second direction Y. The first surface 321a connects the two second surfaces 321b. The first wall 313 is disposed one-on-one opposite the first surfaces 321a, and the second wall 314 is disposed one-on-one opposite the second surfaces 321b. The second surfaces 321b are arc-shaped. At least a portion of the transition wall 315 is disposed opposite the second surfaces 321b. The pressure relief mechanism 40 is disposed on the transition wall 315. The distance between the two first walls 313 along the first direction X is T. The battery cell 30 includes n electrode assemblies 32 arranged along the first direction X. The dimension L1 of the transition wall 315 along the first direction X satisfies: And / or, the dimension L2 of the transition wall 315 along the second direction Y satisfies:
[0142] The battery cell 30 provided in the embodiment of the present application is advantageous in reducing the distance between the outer shell 31 and the electrode assembly 32 by providing the outer shell 31 including a transition wall 315, and providing the transition wall 315 to connect the first wall 313 and the second wall 314, so as to transfer the virtual space S that cannot be used by the battery cell 30 and is formed by the extended surface of the outer surface of the first wall 313 and the second wall 314 and the transition wall 315 to the outside of the battery cell 30, which is advantageous in improving the space utilization rate inside the battery cell 30 and thereby improving the energy density of the battery cell 30. After the battery cells 30 are assembled into the battery device 10, the virtual space S can be used to set related components, so as to facilitate the rational use of the space inside the battery device 10 and facilitate improving the energy density of the battery device 10.
[0143] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and components may be substituted with equivalents without departing from the scope of the present application. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.
Claims
1. A battery cell, characterized in that: include: The housing comprises a first wall, a second wall, and a transition wall, wherein a normal direction of the first wall intersects a normal direction of the second wall, the transition wall connects the first wall and the second wall, and a surface area of one side of the transition wall along its thickness direction is smaller than a surface area of the one side of the first wall along its thickness direction; The electrode assembly is accommodated in the shell.
2. The battery cell according to claim 1, wherein: The battery cell further includes a pressure relief mechanism, which is disposed on the transition wall.
3. The battery cell according to claim 1, wherein: The transition wall is in an arc shape or a straight shape.
4. The battery cell according to claim 1, wherein: The first wall, the second wall and the transition wall are integrally formed.
5. The battery cell according to claim 1, characterized in that The shell includes two first walls opposite to each other along a first direction and two second walls opposite to each other along a second direction. The shell includes a plurality of transition walls, and a transition wall is provided between any adjacent first walls and second walls.
6. The battery cell according to claim 5, characterized in that The electrode assembly includes an electrode body and a tab, wherein the tab is led out from an end portion of the electrode body along a third direction, and the first direction, the second direction and the third direction are perpendicular to each other.
7. The battery cell according to claim 6, characterized in that The electrode body includes two first surfaces opposite to each other along the first direction and two second surfaces opposite to each other along the second direction. The first surface connects the two second surfaces. The first wall is arranged opposite to the first surfaces one by one, and the second wall is arranged opposite to the second surfaces one by one.
8. The battery cell according to claim 7, characterized in that The second surface is arc-shaped, and at least a portion of the transition wall is disposed opposite to the second surface.
9. The battery cell according to claim 7, characterized in that The second surface is arc-shaped, the distance between the two first walls along the first direction is T, the battery cell includes n electrode assemblies arranged along the first direction, and the dimension L1 of the transition wall along the first direction satisfies: And / or, the dimension L2 of the transition wall along the second direction satisfies:
10. The battery cell according to claim 6, characterized in that The electrode assembly is cylindrical.
11. A battery device, characterized in that: The battery cell comprises the battery cell according to any one of claims 1 to 10.
12. An electrical device, characterized in that: The battery device according to claim 11 is used to provide electrical energy.