Battery cell, battery, electric device and method for manufacturing battery cell

Abstract

The present application provides a battery cell, comprising: a shell; an electrode assembly, disposed within the shell; a support member, disposed within the shell, the support member being configured to support the electrode assembly; wherein the support member is a porous structure, so as to be able to reabsorb electrolyte. The battery cell of the technical solution of the present application is provided with a support member, which provides support for the electrode assembly, thereby effectively alleviating the problem of easy decarbonization of the electrode sheet when the electrode assembly is subjected to force and vibration due to the small contact area with the shell. At the same time, the support member is a porous structure, and the porous structure of the support member has a higher liquid absorption performance, thereby alleviating the problem of reduced performance of the battery cell or even lithium deposition due to insufficient electrolyte reabsorption, and effectively extending the service life of the battery cell.

Description

Technical Field

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

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. Electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of the sustainable development of the automotive industry. For electric vehicles, battery technology is a key factor in their development.

[0003] In battery technology, how to extend the service life of batteries is a technical problem that needs to be solved urgently. Summary of the Invention

[0004] The embodiments of the present application provide a battery cell, a battery, an electrical device, and a method for manufacturing a battery cell, which can effectively extend the service life of the battery cell.

[0005] In a first aspect, the present application provides a battery cell comprising: a shell; an electrode assembly disposed in the shell; a support member disposed in the shell, the support member being configured to support the electrode assembly; wherein the support member is a porous structure so as to be able to reabsorb electrolyte.

[0006] In the above technical solution, a support member is provided in the battery cell, and the support member provides support for the electrode assembly. When the battery cell is used upside down (the end of the battery cell provided with the output pole is provided toward the ground or downward, and the support member is provided between the bottom wall of the housing provided with the output pole and the electrode assembly), the support member can provide a larger support area for the electrode assembly. Compared with the method in which the electrode assembly only contacts the area of the bottom wall of the housing located at the periphery of the output pole, the support member can effectively increase the force-bearing area of the electrode assembly, thereby effectively improving the problem that the electrode assembly is easily decarbonized when subjected to force and vibration due to the small contact area with the housing. At the same time, the support member has a porous structure, and the porous structure of the support member has a higher liquid absorption performance. It can reabsorb the electrolyte located around the support member (especially the electrolyte that flows to the side of the support member away from the electrode assembly), thereby improving the electrolyte infiltration effect on the electrode assembly, thereby alleviating the problem of reduced battery performance or even lithium precipitation caused by insufficient electrolyte reabsorption, thereby effectively extending the service life of the battery cell.

[0007] According to some embodiments of the present application, the porosity of the support member is Vc, which satisfies 30%≤Vc≤60%.

[0008] In the above technical solution, the support member is used to support the electrode assembly and improve the infiltration effect of the electrolyte on the electrode assembly. If the porosity of the support member is too large, the support member is prone to brittle fracture, pulling off and other problems during the production and manufacturing process, and the molding process of the support member is more difficult. Moreover, it will directly affect its own structural strength, thereby affecting the reliability of the support member's support for the electrode assembly. If the porosity of the support member is too small, the support member is not easy to accumulate liquid, and thus cannot effectively improve the electrolyte resorption effect of the member. Controlling the porosity of the support member between 30% and 60% can improve the support member's resorption effect on the electrolyte while taking into account the structural strength of the support member and improving the stability of the support member's support for the electrode assembly, thereby improving the electrolyte's infiltration effect on the electrode assembly, and effectively improving the life of the battery cell.

[0009] According to some embodiments of the present application, 40%≤Vc≤50%.

[0010] In the above technical solution, controlling the porosity of the support member between 40% and 50% can further improve the structural strength of the support member and the stability of the support member in supporting the electrode assembly. At the same time, it can further improve the electrolyte resorption effect of the support member.

[0011] According to some embodiments of the present application, the support member has a plurality of channels, and the pore diameter of the channels is R, satisfying 30nm≤R≤80nm.

[0012] In the above technical solution, the support member has a porous structure to facilitate the back-absorption of the electrolyte. If the pore size of the porous support member is too large, a small amount of carbon powder that falls off from the electrode assembly can easily enter the pores or even penetrate the support member. The carbon powder that penetrates the support member can easily fall on the output pole of the battery cell or the pressure relief mechanism of the battery cell, causing the shell to be corroded or the pressure relief mechanism to be blocked, affecting the normal performance and service life of the battery cell. If the pore size of the support member is too small, the process is difficult and the back-absorption amount and efficiency of the electrolyte cannot be effectively improved. Designing the pore size of the pores of the support member to be between 30nm and 80nm can effectively improve the support member's blocking effect on the carbon powder that falls on the support member, and at the same time, improve the support member's back-absorption efficiency of the electrolyte, thereby effectively extending the service life of the battery cell.

[0013] According to some embodiments of the present application, 50 nm ≤ R ≤ 60 nm.

[0014] In the above technical solution, the pore size of the support member is designed to be between 50nm and 60nm, which can further improve the support member's blocking effect on carbon powder falling off the support member, and at the same time, further improve the support member's electrolyte reabsorption efficiency, thereby effectively extending the service life of the battery cell.

[0015] According to some embodiments of the present application, the support member is a flat plate structure.

[0016] In the above technical solution, the support member is a flat plate structure, which effectively increases the contact area between the support member and the electrode assembly, thereby effectively increasing the force-bearing area of the electrode assembly, improving the decarbonization problem of the electrode assembly, and thus extending the service life of the battery cell. In addition, the flat plate structure of the support member can reduce its thickness dimension, thereby reducing the space occupied by the support member within the housing, which is conducive to improving the energy density of the battery cell.

[0017] According to some embodiments of the present application, the thickness of the support member is T, satisfying 0.2 mm ≤ T ≤ 2 mm.

[0018] In the above technical solution, the support member is a flat structure. If the thickness of the support member is too small, it will directly affect the structural strength of the support member itself, thereby affecting the stability of the support member's support performance for the electrode assembly. If the thickness of the support member is too thick, there will be material waste, and it will be detrimental to the lightweight development of the battery cell. At the same time, it is easy to occupy too much internal space of the shell and affect the energy density of the battery cell. Designing the thickness of the support member to be between 0.2mm and 2mm can effectively improve the structural strength of the support member. At the same time, it can reduce the space occupancy rate of the support member in the shell, thereby extending the service life of the battery cell while effectively taking into account the energy density of the battery cell.

[0019] According to some embodiments of the present application, 1 mm ≤ T ≤ 1.5 mm.

[0020] In the above technical solution, the thickness of the support member is designed to be between 1 mm and 1.5 mm, which can further effectively improve the structural strength of the support member and, at the same time, further reduce the space occupied by the support member to the housing.

[0021] According to some embodiments of the present application, the support member is arranged between the first wall of the shell and the electrode assembly, and the support member has a first surface facing the electrode assembly. Along the thickness direction of the first wall, the projection of the electrode assembly completely falls into the first surface.

[0022] In the above technical solution, the projection of the electrode assembly completely falls onto the first surface of the support member, which helps further increase the contact area between the support member and the electrode assembly, thereby further increasing the force-bearing area of the electrode assembly and alleviating the problem of decarburization of the electrode assembly. Furthermore, even if a small amount of decarburization occurs in the electrode assembly, the support member can effectively receive and absorb the detached carbon powder, effectively reducing the probability of carbon powder landing on the housing, pressure relief mechanism, or other components. This reduces the possibility of abnormalities such as housing corrosion and pressure relief mechanism blockage, effectively improving the battery's performance and extending its lifespan.

[0023] According to some embodiments of the present application, the support member is arranged between the first wall of the shell and the electrode assembly, and the battery cell also includes: an insulating member, arranged between the support member and the first wall; wherein, the insulating member has a second surface facing the support member, and the second surface is provided with a groove, and at least a portion of the support member is accommodated in the groove.

[0024] In the above technical solution, an insulating member is provided within the battery cell to insulate and isolate the first wall of the housing from the conductive components within the housing. A groove is provided on the side of the insulating member facing the support member to accommodate the support member. This allows the insulating member and the support member to share a portion of the space within the housing, improving their structural compactness and further reducing the support member's occupancy rate within the housing. Furthermore, the groove in the insulating member acts as a limiter for the support member, facilitating its position during battery cell assembly. This effectively improves the stability of the support member's relative position within the battery cell, thereby fully utilizing the support member and extending the battery cell's service life.

[0025] According to some embodiments of the present application, the support member is loosely fitted with the groove.

[0026] In the above technical solution, the support member and the groove are clearance-matched, which reduces the difficulty of assembling the support member, facilitates the assembly of the support member during the assembly of the battery cell, and facilitates the automated assembly and production of the battery cell.

[0027] According to some embodiments of the present application, the dimension of the groove along the first direction is W1, and the dimension of the support member along the first direction is W2, satisfying 0.2mm<W1-W2<4.0mm, and the first direction is perpendicular to the thickness direction of the first wall.

[0028] In the above technical solution, the dimension of the groove along the first direction is greater than the dimension of the support member along the first direction, thereby achieving a clearance fit between the support member and the groove. If the size difference between the groove and the support member is too small, the assembly accuracy requirement for the support member is too high, which is inconvenient for the assembly operation of the support member. If the size difference between the groove and the support member is too large, the support member is easy to shift in the groove, which is not conducive to limiting the support member. At the same time, the size of the groove is limited by the internal space of the shell, and the size of the support member is limited by the size of the groove, which easily makes the overall size of the support member too small, thereby affecting the supporting effect of the support member on the electrode assembly. Designing the difference between the size of the groove along the first direction and the size of the support member along the first direction to be between 0.2mm and 4mm can effectively improve the convenience of supporting member assembly. At the same time, it improves the limiting effect of the groove on the support member and reduces the restriction on the overall size of the support member, which is conducive to further extending the service life of the battery cell.

[0029] According to some embodiments of the present application, along the thickness direction of the first wall, the depth of the groove is H, and the thickness of the support member is T, satisfying -0.5mm<HT<0.5mm.

[0030] In the above technical solution, the depth of the groove can be greater than or less than the thickness of the support member. When the difference between H and T is less than zero, the groove can only accommodate the portion of the support member along the thickness direction of the first wall. When the difference between H and T is greater than or equal to zero, the support member can be completely accommodated in the groove along the thickness direction of the first wall. If the depth of the groove is too small, the groove cannot fully accommodate the support member, which is likely to affect the stability of the groove in limiting the support member. At the same time, the space shared by the support member and the insulating member along the first direction is too small, which is likely to occupy too much of the internal space of the battery cell. If the depth of the groove is too large, the size of the insulating member along the first direction increases accordingly, which is also not conducive to reducing space utilization, and the insulating member is likely to interfere with the electrode assembly. Controlling the difference between H and T between -0.5mm and 0.5 can effectively improve the stability of the groove in limiting the support member, while reducing the occupancy rate of the insulating member and the support member in the internal space of the shell.

[0031] According to some embodiments of the present application, the insulating member includes: a substrate having a third surface facing the support member; a boss protruding from the third surface, and the groove is provided on the boss.

[0032] In the above technical solution, the insulating member is provided with a boss, and the groove is provided on the boss. The boss supports the support member and provides a space for the support member. At the same time, a certain installation gap can be provided between the base plate of the insulating member and the support member to provide connection space for the output pole.

[0033] According to some embodiments of the present application, a plurality of the bosses are provided, and the plurality of the bosses are arranged at intervals along a second direction, and the second direction is perpendicular to the third surface.

[0034] In the above technical solution, multiple bosses are provided to provide multi-point support for the support member. The multiple bosses are spaced apart, which helps to improve the force balance of the support member, thereby improving the stability of the support member supported by the insulating member, and thus improving the stability of the support member supporting the electrode assembly. Furthermore, the area between two adjacent bosses can form a channel for the conductive member to pass through, facilitating the connection between the output electrode and the electrode assembly.

[0035] According to some embodiments of the present application, the battery cell further includes an electrode terminal, which is arranged on the first wall and passes through the substrate; the electrode assembly includes a main body and a tab extending from the main body, and the tab bypasses the support member and is electrically connected to the electrode terminal.

[0036] In the above technical solution, the electrode terminal is arranged on the first wall to form the output electrode of the battery cell, and the electrode tab of the electrode assembly bypasses the support member and is connected to the electrode terminal, so that the electrode assembly is electrically connected to the electrode terminal.

[0037] According to some embodiments of the present application, the battery cell further includes a transition piece disposed between the substrate and the support member, wherein the transition piece connects the electrode terminal and the tab.

[0038] In the above technical solution, a battery cell is provided with an adapter, and the tab and the electrode terminal are electrically connected via the adapter.

[0039] According to some embodiments of the present application, the electrode assembly includes a main body and a tab extending from the main body, the tab is arranged on a side of the main body facing the support member, and the support member is configured to support at least part of the main body and the tab.

[0040] In the above technical solution, the support member can support the main body of the electrode assembly while providing limited support to the area of the tab located between the support member and the main body, further increasing the support area of the electrode assembly by the support member and reducing the risk of decarbonization of the electrode assembly.

[0041] According to some embodiments of the present application, the battery cell further includes a pressure relief mechanism, which is arranged on the first wall of the shell; the support member is arranged between the first wall and the electrode assembly, and the support member is further provided with a through hole, which corresponds to the position of the pressure relief mechanism.

[0042] In the above technical solution, the support member is provided with a through hole corresponding to the position of the pressure relief mechanism, which effectively reduces the influence of the support member on the pressure relief mechanism and improves the pressure relief smoothness of the battery cell.

[0043] According to some embodiments of the present application, the material of the support member includes at least one of polyethylene, polypropylene, polyimide, polytetrafluoroethylene, polyvinyl fluoride, polyvinylidene fluoride, ethylene-tetrafluoroethylene copolymer, propylene-tetrafluoroethylene copolymer, fluorinated ethylene propylene copolymer, and vinylidene fluoride hexafluoropropylene copolymer.

[0044] In the above technical solution, the material of the support member is made of at least one of the above polymers. While supporting the electrode assembly, it has good insulation performance. At the same time, it has good liquid absorption capacity, effectively improving the electrolyte reabsorption effect, thereby effectively improving the performance of the battery cell.

[0045] According to some embodiments of the present application, the housing includes: a shell having an opening; a cover body covering the opening, and the support member is arranged between the cover body and the electrode assembly.

[0046] In a second aspect, the present application provides a battery comprising the battery cell described in any of the above schemes.

[0047] In a third aspect, the present application provides an electrical device, comprising a battery cell as described in any of the above schemes, wherein the battery cell is used to provide electrical energy; or, comprising a battery as described in the above schemes, wherein the battery is used to provide electrical energy.

[0048] In a fourth aspect, the present application provides a method for manufacturing a battery cell, comprising: preparing a support member with a porous structure; providing an electrode assembly and a shell; and encapsulating the electrode assembly and the support member in the shell.

[0049] In the above technical solution, the support member is made into a porous structure, so that the support member has a higher liquid absorption performance, and can reabsorb the electrolyte located around the support member (especially the electrolyte flowing to the side of the support member away from the electrode assembly), thereby improving the wetting effect of the electrolyte on the electrode assembly, thereby alleviating the problem of reduced performance of the battery cell due to insufficient electrolyte reabsorption, and thus effectively extending the service life of the battery cell.

[0050] According to some embodiments of the present application, the preparation of the porous structure support member includes: mixing a polymer, a pore-forming agent and an antioxidant to form a mixture; and sequentially forming the support member by extruding, cooling, extracting and stretching the mixture.

[0051] In the above technical solution, a pore-forming agent is added to a polymer, which is ultimately formed into a support member through processes such as extrusion, extraction, and stretching. The pore-forming agent enables the formation of multiple freely distributed and freely extending pores within the support member, thereby enhancing the support member's liquid absorption capacity and improving electrolyte return. Compared to the method of machining straight-through holes for liquid return after the support member is formed, the freely extending, smaller-diameter pores formed by the pore-forming agent within the support member effectively reduce the risk of carbon powder accumulation and complete blockage within the pores, thereby fully utilizing the support member's liquid return function. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] 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.

[0053] Figure 1 A schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0054] Figure 2 A cross-sectional view of a battery provided for some embodiments of the present application;

[0055] Figure 3 An exploded view of the structure of a battery cell provided in some embodiments of the present application;

[0056] Figure 4 An exploded view of a local structure of a battery cell provided in some embodiments of the present application;

[0057] Figure 5 A schematic structural diagram of a support member provided in some embodiments of the present application;

[0058] Figure 6 An exploded view of the structure of the support member and the insulating member provided in some embodiments of the present application;

[0059] Figure 7 An axonometric view of a support member provided in some embodiments of the present application accommodated in a groove of an insulating member;

[0060] Figure 8 A top view of a support member provided in some embodiments of the present application accommodated in a groove of an insulating member;

[0061] Figure 9 A side view of a support member provided in some embodiments of the present application accommodated in a groove of an insulating member;

[0062] Figure 10 for Figure 4 A front view of a partial structure of a battery cell is shown;

[0063] Figure 11 for Figure 10 A cross-sectional view in the AA direction is shown;

[0064] Figure 12 for Figure 11 A partial enlarged view of portion B is shown;

[0065] Figure 13 A schematic flow chart of a method for manufacturing a battery cell provided in some embodiments of the present application.

[0066] Icons: 1000-vehicle; 100-battery; 10-housing; 11-first part; 12-second part; 20-battery cell; 21-housing; 211-shell; 2111-opening; 212-first wall; 213-cover; 22-electrode assembly; 221-main body; 222-ear; 222a-positive electrode ear; 222b-negative electrode ear; 23-support member; 231-first surface; 232-through hole; 233-channel; 24-insulating member; 241-substrate; 242-boss; 243-groove; 244-second surface; 245-third surface; 25-adapter; 26-electrode terminal; 26a-positive terminal; 26b-negative terminal; 27-pressure relief mechanism; 200-controller; 300-motor. DETAILED DESCRIPTION

[0067] 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 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.

[0068] 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 for the purpose of describing specific embodiments only 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.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0073] The term "plurality" used in this application refers to two or more (including two).

[0074] In this application, battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and the embodiments of this application do not limit this. Battery cells may be cylindrical, flat, rectangular, or other shapes, etc., and the embodiments of this application do not limit this. Battery cells are generally divided into three types based on the packaging method: cylindrical battery cells, prismatic battery cells, and soft-pack battery cells, and the embodiments of this application do not limit this.

[0075] The battery referred to in the embodiments of this application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in this application may include a battery module or a battery pack. A battery generally includes a housing that encloses one or more battery cells or multiple battery modules. The housing prevents liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0076] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly consists of a positive electrode sheet, a negative electrode sheet, and a separator. A battery cell primarily operates by the movement of metal ions between the positive and negative electrode sheets. The positive electrode sheet includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive electrode collector. The portion of the positive electrode collector not coated with the positive active material layer serves as the positive tab, allowing power to be input or output from the positive electrode sheet through the positive tab. For lithium-ion batteries, for example, the positive electrode current collector can be made of aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide. The negative electrode sheet includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative electrode collector. The portion of the negative electrode collector not coated with the negative active material layer serves as the negative tab, allowing power to be input or output from the negative electrode sheet through the negative tab. The negative electrode current collector can be made of copper, and the negative active material can be carbon or silicon, among others. In order to ensure that large currents can pass without melting, there are multiple positive electrode tabs and they are stacked together, and there are multiple negative electrode tabs and they are stacked together.

[0077] The material of the isolation film may be polypropylene (PP) or polyethylene (PE), etc. In addition, the electrode assembly may be a wound structure or a laminated structure, but the present invention is not limited thereto.

[0078] Batteries, with their outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide adaptability, and low self-discharge coefficient, are an important component of today's new energy development. However, with the continuous development of battery technology, higher requirements are also being placed on battery service life and other aspects.

[0079] For a typical battery cell, a positive electrode sheet, a negative electrode sheet, and a separator are typically assembled into an electrode assembly (bare cell) by winding or laminating them. This is then placed in a housing, covered with end caps, and finally injected with electrolyte. The end caps of the battery cell typically cover the opening of the housing. To facilitate assembly of the battery cell, electrode terminals are typically provided on the housing or end caps of the battery cell. The electrode terminals can be connected to the tabs of the electrode assembly via current collecting members provided in the housing to achieve electrical connection between the electrode terminals and the electrode assembly. The electrode terminals serve as the output poles of the battery cell, enabling the input or output of electrical energy from the battery cell.

[0080] In some technologies, the battery cells in the battery are usually used upside down, with the side of the battery cell provided with the electrode terminals facing the bottom of the box housing the battery cells. However, the applicant has found that the inverted battery cells provide insufficient support for the electrode assembly. When the battery cell is subjected to force (such as vibration), the force-bearing area of the electrode assembly is small, and the carbon powder of the electrode sheet is easily shed, affecting the service life of the electrode sheet. At the same time, the carbon powder shed from the electrode sheet is easy to corrode the outer shell or block the pressure relief mechanism of the battery cell, thereby seriously affecting the performance and service life of the battery cell. In addition, when the battery cell is used upside down, there is a large gap between the bottom of the electrode assembly and the bottom wall of the battery cell housing, where electrolyte easily accumulates, which easily affects the electrolyte's infiltration effect on the electrode assembly, thereby causing the battery cell to not perform normally. In addition, as the battery is used, the electrolyte is gradually consumed, and the problem of electrolyte infiltration during use becomes more prominent. As the electrolyte's infiltration effect on the electrode assembly becomes worse and worse, the impact on the performance of the battery cell will become increasingly greater. In severe cases, it will cause lithium deposition in the electrode assembly, thereby seriously affecting the performance and service life of the battery cell.

[0081] Based on the above considerations, in order to solve the problem of short service life of battery cells, the inventors have conducted in-depth research and designed a battery cell provided in this application, which includes: a shell, an electrode assembly and a support member, the electrode assembly is arranged in the shell, the support member is in the shell and supports the electrode assembly, and the support member is a porous structure to be able to reabsorb electrolyte. In the technical solution of this application, a support member is arranged in the battery cell, and the support member provides support for the electrode assembly. When the battery cell is used upside down (the end of the battery cell provided with the output pole is arranged toward the ground or downward, and the support member is arranged between the bottom wall of the shell provided with the output pole and the electrode assembly), the support member can increase the support area for the electrode assembly. Compared with the method in which the electrode assembly only contacts the area of the bottom wall of the shell located outside the output pole, the support member effectively increases the force-bearing area of the electrode assembly, thereby effectively improving the problem that the electrode assembly is easily decarbonized when subjected to force and vibration due to the small contact area with the shell. At the same time, even if carbon powder falls off, the support member can also serve to receive the carbon powder, reducing the possibility of carbon powder falling and corroding the shell or clogging the pressure relief mechanism of the battery cell, further improving the performance and service life of the battery cell.

[0082] In addition, the present application has a porous structure for the support member. The porous structure of the support member has a higher liquid absorption performance, and can reabsorb the electrolyte located around the support member (especially the electrolyte that flows to the side of the support member away from the electrode assembly), thereby improving the wetting effect of the electrolyte on the electrode assembly, thereby alleviating the problem of reduced performance of the battery cell due to insufficient electrolyte reabsorption, and thus effectively improving the service life of the battery cell.

[0083] The battery cells disclosed in the embodiments of the present application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft. A power supply system comprising the battery cells and batteries disclosed in the present application can be used to form the electrical device.

[0084] The present invention provides an electric device that uses a battery as a power source. The electric device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, 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.

[0085] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0086] Please refer to Figure 1 , Figure 1 A schematic structural diagram of a vehicle 1000 provided for some embodiments of the present application. 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 100 is provided inside the vehicle 1000. The battery 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000. For example, the battery 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 to control the battery 100 to power the motor 300, for example, to meet the power requirements for starting, navigating and driving the vehicle 1000.

[0087] In some embodiments of the present application, the battery 100 can serve not only as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0088] Please refer to Figure 2 and Figure 3 , Figure 2 A cross-sectional view of a battery provided for some embodiments of the present application; Figure 3An exploded diagram of the structure of a battery cell provided in some embodiments of the present application. Battery 100 includes a housing 10 and a battery cell 20, which is intended to be housed within housing 10. Housing 10 is used to provide assembly space for battery cell 20, and housing 10 can have a variety of structures. In some embodiments, housing 10 can include a first portion 11 and a second portion 12, which overlap each other and together define an assembly space for accommodating battery cell 20. First portion 11 can be a hollow structure with one end open, and second portion 12 can be a plate-like structure, overlapping the open side of first portion 11 so that the first and second portions 12 together define an assembly space. Alternatively, first portion 11 and second portion 12 can both be hollow structures with one end open, with the open side of first portion 11 overlapping the open side of second portion 12. Of course, housing 10 formed by first portion 11 and second portion 12 can have a variety of shapes, such as a cylinder, a rectangular parallelepiped, etc.

[0089] In the battery 100, there may be multiple battery cells 20, and the multiple battery cells 20 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 20. The multiple battery cells 20 may be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery cell 20 may be housed within the housing 10. Alternatively, the battery 100 may be constructed by first connecting multiple battery cells 20 in series, in parallel, or in a hybrid connection to form a battery module, which is then connected in series, in parallel, or in a hybrid connection to form a complete battery module, and then housed within the housing 10. The battery 100 may also include other structures, such as a busbar assembly for electrically connecting the multiple battery cells 20.

[0090] Each battery cell 20 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto. The battery cell 20 can be cylindrical, flat, rectangular or other shapes. For example, in Figure 3 In the figure, the battery cell 20 is a rectangular parallelepiped structure.

[0091] According to some embodiments of the present application, referring to Figure 3 , and further reference Figure 4 , Figure 4 An exploded diagram of the local structure of a battery cell provided in some embodiments of the present application; Some embodiments of the present application provide a battery cell 20, which includes a shell 21, an electrode assembly 22 and a support member 23. The electrode assembly 22 and the support member 23 are both arranged in the shell 21, and the support member 23 is configured to support the electrode assembly 22. The support member 23 is a porous structure so as to be able to reabsorb electrolyte.

[0092] The electrode assembly 22 is housed within the housing 21 and is the component within the battery cell 20 where the electrochemical reaction occurs. The main body 221 of the electrode assembly 22 may include a positive electrode sheet, a negative electrode sheet, and a separator. The main body of the electrode assembly 22 may be a wound structure formed by winding the positive electrode sheet, separator, and negative electrode sheet, or a stacked structure formed by stacking the positive electrode sheet, separator, and negative electrode sheet.

[0093] Optionally, the number of electrode assemblies 22 contained in the housing 21 may be one or more. Figure 4 In the embodiment, there are two electrode assemblies 22, and the two electrode assemblies 22 are stacked along the thickness direction of the battery cell 20. That is, the two electrode assemblies 22 are stacked along the thickness direction of the battery cell 20. Of course, in other embodiments, the electrode assemblies 22 accommodated in the housing 21 can also be stacked in three, four, five, or six layers.

[0094] The housing 21 provides a storage space for components such as the electrode assembly 22, the support member 23, and the electrolyte. The housing 21 can have a variety of implementation structures. For example, the housing 21 can include a shell 211 and a cover 213. The shell 211 is determined according to the shape of the electrode assembly 22. For example, the shell 211 can be a hollow rectangular parallelepiped, a cube, or a cylinder, and one of the surfaces of the shell 211 has an opening 2111 so that one or more electrode assemblies 22 can be placed in the shell 211. The cover 213 is used to cover the shell 211. The shell 211 and the cover 213 together form a closed cavity for placing the electrode assembly 22. The shape of the shell 211 can be determined according to the specific shape of the electrode assembly 22. For example, if the electrode assembly 22 is a cylindrical structure, the shell 211 can adopt a cylindrical structure; if the electrode assembly 22 is a rectangular parallelepiped structure, the shell 211 can adopt a rectangular parallelepiped structure. Of course, the cover 213 can also be of various structures, for example, the cover 213 is a plate-shaped structure or a hollow structure with one end open, etc. The shell 211 and the cover 213 can also be made of various materials, such as copper, iron, aluminum, steel, aluminum alloy, etc.

[0095] When assembling the battery cell 20 , the electrode assembly 22 may be placed in the housing 211 , and the housing 211 may be filled with electrolyte. The cover 213 may then be placed over the opening 2111 of the housing 211 .

[0096] The outer shell 21 may also be provided with an electrode terminal 26 electrically connected to the electrode assembly 22. The electrode terminal 26 may be electrically connected to the electrode assembly 22 and serve as the output terminal of the battery cell 20 to enable the input or output of electrical energy from the battery cell 20. When the battery cell 20 is used inverted, that is, the end of the battery cell 20 provided with the electrode terminal is positioned toward the bottom of the case 10 in the Z direction, or during actual use, the end of the battery cell 20 provided with the electrode terminal is positioned toward the ground or downward, such that the Z direction is the vertical direction. The cover 213 may form the bottom wall of the outer shell 21. Of course, any wall portion of the shell 211 may also form the bottom wall of the outer shell 21.

[0097] For example, Figure 4 As shown, Figure 4 and Figure 3 Top and bottom are reversed, along Figure 4 In the Z direction shown in the figure, the shell 211 is a hollow rectangular structure with one end open in the Z direction. The cover 213 is a plate-like structure and covers the opening 2111 of the shell 211 to form a sealed connection. The cover 213 forms the bottom wall of the outer shell 21, and the electrode terminal 26 is provided on the cover 213. The battery cell 20 is used inverted.

[0098] In other embodiments, the battery cell 20 can also be used in a conventional posture, such as with the end of the housing 21 provided with the electrode terminal facing the top of the box body 10. Alternatively, during actual use, the end of the battery cell 20 provided with the electrode terminal is set upward.

[0099] The support member 23 is disposed in the housing 21 and is configured to support the electrode assembly 22, that is, along the Z direction, at least a portion of the support member 23 is disposed between the bottom wall of the housing 21 and the electrode assembly 22 to be configured to support the electrode assembly 22. Figure 4 As shown, the battery cell 20 is used upside down, and the support member 23 is disposed in the housing 21 and below the electrode assembly 22 .

[0100] The support member 23 has a porous structure. The support member 23 can be made directly from a porous material. The support member 23 can also adopt a high-density structure and machine a plurality of channels 233 on the structure to form a porous structure. It is understood that the multiple channels 233 on the support member 23 can be freely distributed. For example, if the support member 23 itself is made of a porous material, the channels 233 of the support member can be freely distributed. The multiple channels 233 on the support member 23 can also be arranged in a certain order. For example, multiple channels 233 can be machined on the support member 23 to form a porous structure, and the machined multiple channels 233 are arranged in a matrix on the support member 23.

[0101] Among them, the support member 23 can be in the shape of a block, a plate or any other shape, and the side of the support member 23 facing the electrode assembly 22 can have a surface that abuts the electrode assembly 22 to provide support for the electrode assembly 22. It should be noted that in order to reduce the possibility of mutual conduction between the electrode assembly 22 and the support member 23, the support member 23 can be directly made of an insulating material. Alternatively, an insulating structure, such as an insulating coating, an insulating pad, etc., can be provided on the side of the support member 23 facing the electrode assembly 22. Exemplarily, the material of the support member 23 is an insulating material.

[0102] A support member 23 is disposed within the battery cell 20 to provide support for the electrode assembly 22. When the battery cell 20 is inverted (with the end of the battery cell 20 provided with the output electrode facing the ground or facing downward, and the support member 23 disposed between the bottom wall of the housing 21 provided with the output electrode and the electrode assembly 22), the support member 23 increases the support area for the electrode assembly 22, effectively increasing the force-bearing area of the electrode assembly 22. This effectively alleviates the problem of electrode sheet decarbonization being easily caused by the small contact area between the electrode assembly 22 and the housing 21 when subjected to force and vibration. Furthermore, the support member 23 has a porous structure with enhanced liquid absorption performance. This porous structure can reabsorb electrolyte surrounding the support member 23 (particularly electrolyte flowing to the side of the support member 23 facing away from the electrode assembly 22), thereby improving the electrolyte's wetting effect on the electrode assembly 22. This alleviates the problem of reduced performance of the battery cell 20 due to insufficient electrolyte reabsorption, thereby effectively extending the service life of the battery cell 20.

[0103] According to some embodiments of the present application, the porosity of the support member 23 is Vc, which satisfies 30%≤Vc≤60%.

[0104] Porosity refers to the ratio of the pore volume in a bulk material to the total volume of the material in its natural state. A related concept to porosity is material density. Density indicates the degree to which a material is filled with solid matter. It quantitatively reflects the solid content within the material and has the opposite effect on material properties as porosity. The porosity or density of a material directly reflects its compactness. A higher porosity indicates a lower density.

[0105] The porosity Vc of the support member 23 may be any value greater than or equal to 30% and less than or equal to 60%. For example, Vc may be 30%, 35%, 40%, 45%, 50%, 55%, 58%, 60%, etc. For example, Vc may be 30%.

[0106] If the porosity of the support member 23 is too large, the support member 23 is prone to brittle fracture, pulling off and other problems during the production process, and the molding process of the support member 23 is difficult. In addition, it will directly affect its own structural strength, thereby affecting the reliability of the support member 23's support for the electrode assembly 22. If the porosity of the support member 23 is too small, the support member 23 is not easy to accumulate liquid, and thus cannot effectively improve the electrolyte resorption effect of the member. Controlling the porosity of the support member 23 between 30% and 60% can improve the electrolyte resorption effect of the support member 23 while taking into account the structural strength of the support member 23 and improving the support stability of the support member 23 on the electrode assembly 22, thereby improving the electrolyte infiltration effect of the electrode assembly 22, so that the life of the battery cell 20 is effectively improved.

[0107] According to some embodiments of the present application, 40%≤Vc≤50%.

[0108] Specifically, the porosity Vc of the support member 23 may be any value greater than or equal to 40% and less than or equal to 50%. For example, Vc may be 40%, 41%, 42%, 43%, 44%, 45%, 46%, 47%, 48%, 48.6%, 49%, etc. For example, Vc may be 45.5%.

[0109] Controlling the porosity of the support member 23 between 40% and 50% can further improve the structural strength of the support member 23 and the stability of the support member 23 in supporting the electrode assembly 22. At the same time, the electrolyte resorption effect of the support member 23 can be further improved.

[0110] According to some embodiments of this application, please refer to Figure 4 , and further reference Figure 5 , Figure 5 Schematic diagram of the structure of the support member provided in some embodiments of the present application. The support member 23 has a plurality of channels 233, and the pore diameter of the channel 233 is R, which satisfies 30nm≤R≤80nm.

[0111] It is understood that the apertures of the multiple channels 233 of the support member 23 can be the same or different. If the apertures of the multiple channels 233 of the support member 23 are the same, the aperture of each channel 233 of the support member 23 can be any value greater than or equal to 30 nm and less than or equal to 80 nm. For example, the aperture R of each hole of the support member 23 can be 30 nm, 31 nm, 35 nm, 40 nm, 45 nm, 50 nm, 60 nm, 70 nm, 80 nm, etc.

[0112] For another example, the pores 233 of the support member 23 may have different pore sizes. Among all the pores 233 of the support member 23, the pore size of the largest pore 233 may be less than or equal to 80 nm, and the pore size of the smallest pore 233 may be greater than or equal to 30 nm. For example, the pore sizes of the pores 233 of the support member 23 may be different, and the pore sizes of all the pores 233 of the support member 23 are controlled to be between 30 nm and 80 nm.

[0113] The support member 23 has a porous structure, which facilitates electrolyte reabsorption. If the pore size of the porous support member 23 is too large, a small amount of carbon powder that falls off from the electrode assembly 22 can easily enter the pores 233 or even flow downstream, passing through the support member 23 and continuing to fall. The carbon powder that passes through the support member 23 can easily land on the output electrode of the battery cell 20 or the pressure relief mechanism 27 of the battery cell 20, causing corrosion of the outer shell 21 or clogging of the pressure relief mechanism 27, thereby affecting the normal performance and service life of the battery cell 20. If the pore size of the support member 23 is too small, the manufacturing process of the support member 23 is difficult and the electrolyte reabsorption rate and efficiency cannot be effectively improved. Designing the pore size of the pores 233 of the support member 23 between 30nm and 80nm can effectively improve the support member 23's ability to block carbon powder that falls on the support member 23 and improve the electrolyte reabsorption efficiency of the support member 23, thereby effectively extending the service life of the battery cell 20.

[0114] According to some embodiments of the present application, 50 nm ≤ R ≤ 60 nm.

[0115] Specifically, the pore size R of all the channels 233 of the support member 23 is controlled between 50nm and 60nm. For example, R can be 50nm, 51nm, 52nm, 53nm, 54nm, 55nm, 56nm, 57nm, 57.5nm, 58nm, 59nm, etc.

[0116] Designing the pore size of the channel 233 of the support member 23 to be between 50nm and 60nm can further improve the support member 23's blocking effect on carbon powder falling off the support member 23, and at the same time, further improve the support member 23's electrolyte reabsorption efficiency, thereby effectively extending the service life of the battery cell 20.

[0117] According to some embodiments of the present application, Figure 4 and Figure 5 As shown, the support member 23 is a flat plate structure.

[0118] Specifically, the support member 23 has two planes arranged opposite to each other along the Z direction, one of which faces the electrode assembly 22 and abuts against the electrode assembly 22, so that the support member 23 provides supporting force for the electrode assembly 22, and the surface of the support member 23 abutting against the electrode assembly 22 forms a supporting surface of the support member 23.

[0119] The support surface may be completely in contact with the electrode assembly 22, or only partially in contact with the electrode assembly 22. Similarly, the end of the electrode assembly 22 facing the support surface may be completely in contact with the support surface, or only partially in contact with the support surface.

[0120] The flat structure of the support member 23 effectively increases the contact area between the support member 23 and the electrode assembly 22, thereby effectively increasing the force-bearing area of the electrode assembly 22, improving the decarbonization problem of the electrode assembly 22, and thus extending the service life of the battery cell 20. Furthermore, the flat structure of the support member 23 reduces its thickness, thereby reducing the space occupied by the support member 23 within the outer casing 21, which helps to increase the energy density of the battery cell 20.

[0121] According to some embodiments of this application, please continue to refer to Figure 4 The thickness of the support member 23 is T, satisfying 0.2mm≤T≤2mm.

[0122] like Figure 4 As shown, the thickness direction of the support member 23 extends along the Z direction. The thickness T of the support member 23 can be any value greater than or equal to 0.2 mm and less than or equal to 2 mm. For example, T can be 0.2 mm, 0.3 mm, 0.5 mm, 0.8 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.7 mm, 1.9 mm, 2 mm, etc. For example, T can be 2 mm.

[0123] The support member 23 is a flat plate. If the thickness of the support member 23 is too small, it will directly affect the structural strength of the support member 23 itself, thereby affecting the stability of the support member 23's support performance for the electrode assembly 22. If the thickness of the support member 23 is too large, there will be a significant waste of material, which is not conducive to the lightweight development of the battery cell 20. At the same time, it will easily occupy too much internal space of the outer shell 21, affecting the energy density of the battery cell 20. Designing the thickness of the support member 23 between 0.2mm and 2mm can effectively improve the structural strength of the support member 23 while reducing the space occupied by the support member 23 in the outer shell 21. This can effectively improve the service life of the battery cell 20 while effectively taking into account the energy density of the battery cell 20.

[0124] According to some embodiments of the present application, 1 mm ≤ T ≤ 1.5 mm.

[0125] The thickness T of the support member 23 may be any value greater than or equal to 1 mm and less than or equal to 1.5 mm, for example, T may be 1 mm, 1.1 mm, 1.2 mm, 1.25 mm, 1.3 mm, 1.35 mm, 1.4 mm, 1.45 mm, 1.48 mm, 1.5 mm, etc. For example, T may be 1 mm.

[0126] Designing the thickness of the support member 23 to be between 1 mm and 1.5 mm can further effectively improve the structural strength of the support member 23 and, at the same time, further reduce the space occupied by the support member 23 in the housing 21 .

[0127] According to some embodiments of this application, please continue to refer to Figure 4 The support member 23 is arranged between the first wall 212 of the shell 21 and the electrode assembly 22. The support member 23 has a first surface 231 facing the electrode assembly 22. Along the thickness direction of the first wall 212, the projection of the electrode assembly 22 completely falls into the first surface 231.

[0128] Specifically, if Figure 4 As shown, the thickness direction of the first wall 212 extends along the Z direction. When the battery cell 20 is used upside down, the first wall 212 can be set toward the bottom of the box body 10, or in actual use, the first wall 212 is set toward the ground or downward, so that the Z direction is the up and down direction.

[0129] The support member 23 has a first surface 231 facing the electrode assembly 22 . That is, the first surface 231 forms the aforementioned support surface. The first surface 231 is used to abut against the electrode assembly 22 so that the support member 23 supports the electrode assembly 22 .

[0130] The thickness direction of the first wall 212 is parallel to the arrangement direction of the support member 23 and the electrode assembly 22, that is, along the direction from the electrode assembly 22 to the support member 23 ( Figure 4 In the Z direction, the projection of the electrode assembly 22 on the support member 23 completely falls within the first surface 231. That is, along the Z direction, the first surface 231 of the support member 23 can completely cover the end of the electrode assembly 22 facing the support member 23.

[0131] The projection of the electrode assembly 22 completely falls within the first surface 231 of the support member 23, which further increases the contact area between the support member 23 and the electrode assembly 22, thereby further increasing the force-bearing area of the electrode assembly 22 and alleviating the decarburization problem of the electrode assembly 22. Furthermore, even if a small amount of decarburization occurs in the electrode assembly 22, the support member 23 can effectively receive and absorb the detached carbon powder, effectively reducing the probability of carbon powder landing on the housing 21, the pressure relief mechanism 27, or other components. This reduces the probability of abnormalities such as corrosion of the housing 21 and blockage of the pressure relief mechanism 27, effectively improving the performance and service life of the battery 100.

[0132] According to some embodiments of this application, please continue to refer to Figure 4 and Figure 5 , and further reference Figure 6 and Figure 7 , Figure 6 An exploded view of the structure of the support member and the insulating member provided in some embodiments of the present application; Figure 7 An axonometric view of a support member provided for some embodiments of the present application, in which the support member is accommodated in a groove of an insulating member; the support member 23 is arranged between the first wall 212 of the outer shell 21 and the electrode assembly 22, and the battery cell 20 also includes an insulating member 24, which is arranged between the support member 23 and the first wall 212; wherein the insulating member 24 has a second surface 244 facing the support member 23, and the second surface 244 is provided with a groove 243, and at least a portion of the support member 23 is accommodated in the groove 243.

[0133] As described above, the thickness direction of the first wall 212 extends along the Z direction. When the battery cell 20 is used upside down, the first wall 212 can be set toward the bottom of the box body 10, or during actual use, the first wall 212 is set toward the ground or downward, so that the Z direction is the up and down direction.

[0134] Along the Z direction, the insulating member 24 is disposed between the support member 23 and the first wall 212. The insulating member 24 provides insulation between the conductive components within the housing 21 and the first wall 212 to reduce the risk of short circuits. The insulating member 24 can be made of a variety of materials, such as rubber, silicone, or plastic.

[0135] In some embodiments, the first insulating member 24 may be connected to the inner surface of the first wall 212 by bonding, clamping, or other connection methods.

[0136] The end of the insulating member 24 facing the support member 23 is provided with a groove 243. The depth of the groove 243 extends along the Z direction. The groove 243 supports and accommodates the support member 23. There are various configurations for the groove 243. The opening shape of the groove 243 can match the shape of the support member 23. For example, if the cross-section of the support member 23 facing the insulating member 24 is rectangular, the groove 243 can also be a corresponding rectangular slot. Of course, the opening shape of the groove 243 can also differ from the cross-sectional shape of the end of the support member 23 extending into the groove 243.

[0137] It is understandable that only one groove 243 may be provided, and along the Z direction, the support member 23 may be entirely accommodated in the groove 243 , or the support member 23 may be partially accommodated in the groove 243 .

[0138] Of course, two, three or even more grooves 243 may be provided, and the plurality of grooves 243 may be arranged in a direction perpendicular to the Z direction, and different portions of the support member 23 perpendicular to the Z direction are accommodated in different grooves 243. The plurality of grooves 243 simultaneously accommodate and support the support member 23.

[0139] An insulating member 24 is disposed within the battery cell 20, insulating and isolating the first wall 212 of the outer shell 21 from the conductive components within the outer shell 21. A recess 243 is disposed on the side of the insulating member 24 facing the support member 23. This recess 243 accommodates the support member 23, allowing the insulating member 24 and the support member 23 to share a portion of the space within the outer shell 21. This improves the structural compactness of the insulating member 24 and the support member 23 and further reduces the space occupied by the support member 23 within the outer shell 21. Furthermore, the recess 243 of the insulating member 24 acts as a limiter for the support member 23, facilitating its position during assembly of the battery cell 20. This effectively improves the stability of the support member 23's relative position within the battery cell 20, thereby facilitating full utilization of the support member 23 and extending the service life of the battery cell 20.

[0140] According to some embodiments of this application, please continue to refer to Figure 6 and Figure 7 , and further reference Figure 8 , Figure 8 This is a top view of a support member provided in some embodiments of the present application, which is accommodated in a groove of an insulating member. The support member 23 is loosely fitted in the groove 243 .

[0141] That is, after all or part of the support member 23 is accommodated in the groove 243 , there is a gap between the edge of the support member 23 in the groove 243 and the inner wall of the groove 243 , so that the support member 23 has a certain movable space in the groove 243 .

[0142] For example, Figure 7 As shown, along the Z direction, the position of the support member 23 corresponding to the groove 243 is accommodated in the groove 243, the width of the groove 243 (the width direction extends along the X direction) is greater than the width of the support member 23 (the width direction extends along the X direction), and the support member 23 and the groove 243 are loosely matched.

[0143] It is understandable that when only one groove 243 is provided, the length of the groove 243 (the length direction extends along the Y direction) may also be greater than the length of the support member 23 (the length direction extends along the Y direction).

[0144] The support member 23 is loosely matched with the groove 243 , which reduces the difficulty of assembling the support member 23 , facilitates the assembly of the support member 23 when assembling the battery cell 20 , and facilitates the automated assembly and production of the battery cell 20 .

[0145] According to some embodiments of this application, please continue to refer to Figures 6 to 8 The dimension of the groove 243 along the first direction is W1, and the dimension of the support member 23 along the first direction is W2, satisfying 0.2mm<W1-W2<4.0mm, and the first direction is perpendicular to the thickness direction of the first wall 212.

[0146] Specifically, the depth direction of the groove 243 extends along the Z direction, and the width direction of the groove 243 extends along the first direction ( Figure 8 The width of the support member 23 extends along the first direction (the X direction in the figure). After the support member 23 is accommodated in the groove 243, the support member 23 and the groove 243 are loosely fitted along the first direction X.

[0147] The difference between the dimension W1 of the groove 243 along the first direction and the dimension W2 of the support member 23 along the first direction can be any value greater than 0.2 mm and less than 4 mm. For example, W1-W2 can be 0.21 mm, 0.25 mm, 0.3 mm, 0.5 mm, 1 mm, 2 mm, 2.5 mm, 2.8 mm, 3 mm, 3.5 mm, 3.8 mm, etc. For example, W1-W2 can be 2 mm.

[0148] The dimension of the groove 243 along the first direction is greater than the dimension of the support member 23 along the first direction, thereby achieving a clearance fit between the support member 23 and the groove 243. If the size difference between the groove 243 and the support member 23 is too small, the assembly precision of the support member 23 is too high, making it difficult to assemble the support member 23. If the size difference between the groove 243 and the support member 23 is too large, the support member 23 may easily shift within the groove 243, hindering the positioning of the support member 23. At the same time, the size of the groove 243 is limited by the internal space of the housing 21, and the size of the support member 23 is also limited by the size of the groove 243, which can easily make the overall size of the support member 23 too small, thereby affecting the support function of the support member 23 for the electrode assembly 22. Designing the difference between the size of the groove 243 along the first direction and the size of the support member 23 along the first direction to be between 0.2 mm and 4 mm can effectively improve the convenience of assembling the support member 23. At the same time, it improves the limiting effect of the groove 243 on the support member 23 and reduces the restriction on the overall size of the support member 23, which is conducive to further extending the service life of the battery cell 20.

[0149] According to some embodiments of this application, please continue to refer to Figures 6 to 8 , and further reference Figure 9 , Figure 9 A side view of a support member provided in some embodiments of the present application and housed in a groove of an insulating member. Along the thickness direction of the first wall 212, the depth of the groove 243 is H, and the thickness of the support member 23 is T, satisfying -0.5mm<HT<0.5mm.

[0150] Specifically, if Figure 9 As shown, the thickness direction of the first wall 212 extends along the Z direction, and the depth of the groove 243 and the thickness of the support member 23 both extend along the Z direction.

[0151] The difference between the depth H of the groove 243 and the thickness T of the support member 23 may be any value greater than -0.5 mm and less than 0.5 mm.

[0152] For example, the difference between H and T can be any value greater than -0.5mm and less than or equal to 0, that is, the depth of the groove 243 is less than or equal to the thickness of the support member 23, and the difference between the groove 243 and the support member 23 can be -0.4mm, -0.3mm, -0.2mm, -0.1mm, 0, etc.

[0153] For example, the difference between H and T can be any value greater than or equal to 0 and less than or equal to 0.5 mm, that is, the depth of the groove 243 is greater than or equal to the thickness of the support member 23, and the difference between the groove 243 and the support member 23 can be 0.4 mm, 0.3 mm, 0.2 mm, 0.1 mm, 0, etc.

[0154] The depth of the groove 243 can be greater than or less than the thickness of the support member 23. When the difference between H and T is less than zero, the groove 243 can only accommodate the portion of the support member 23 along the thickness direction of the first wall 212. When the difference between H and T is greater than or equal to zero, the support member 23 can be completely accommodated within the groove 243 along the thickness direction of the first wall 212. If the depth of the groove 243 is too small, the groove 243 cannot fully accommodate the support member 23, which can easily affect the stability of the groove 243 in retaining the support member 23. At the same time, the space shared by the support member 23 and the insulating member 24 along the first direction is too small, which can easily occupy too much internal space of the battery cell 20. If the depth of the groove 243 is too large, the groove 243 will be too redundant after accommodating the insulating member 24, and the size of the insulating member 24 along the first direction will increase accordingly, which also does not reduce space utilization and can easily interfere with the electrode assembly 22. Controlling the difference between H and T between -0.5 mm and 0.5 can effectively improve the stability of the groove 243 in limiting the support member 23, while reducing the occupancy rate of the insulating member 24 and the support member 23 in the internal space of the shell 21.

[0155] According to some embodiments of this application, please refer to Figures 6 to 9 The insulating member 24 includes a base plate 241 and a boss 242 . The base plate 241 has a third surface 245 facing the support member 23 . The boss 242 protrudes from the third surface 245 , and the groove 243 is disposed on the boss 242 .

[0156] Specifically, the substrate 241 is adjacent to the first wall 212 . Based on the embodiment in which the insulating member 24 is connected to the first wall 212 , the relative position of the substrate 241 and the first wall 212 can be fixed by means of snapping, bonding, or the like.

[0157] As mentioned above, the number of the groove 243 can be one or more, and correspondingly, the number of the boss 242 can be one or more.

[0158] The support member 23 is accommodated in the groove 243 on the boss 242 of the insulating member 24 , and a certain accommodation space may be defined between the support member 23 and the base plate 241 of the insulating member 24 .

[0159] The insulating member 24 is provided with a boss 242, and a groove 243 is provided on the boss 242. The boss 242 supports the support member 23 and provides a space for the support member 23. At the same time, a certain installation gap can be provided between the base plate 241 of the insulating member 24 and the support member 23 to provide connection space for the output terminal of the battery cell 20.

[0160] According to some embodiments of the present application, Figure 6 and Figure 7 As shown, a plurality of bosses 242 are provided, and the plurality of bosses 242 are arranged at intervals along the second direction, and the second direction is perpendicular to the third surface 245 .

[0161] Specifically, the second direction may be any direction perpendicular to the third surface 245 of the boss 242. For example, the second direction is along Figure 6 The three bosses 242 extend in the Y direction, and the three bosses 242 are spaced apart along the second direction Y. The grooves 243 on the three bosses 242 are all used to accommodate the support member 23. The three grooves 243 accommodate different parts of the support member 23 along the second direction Y. The three bosses 242 jointly support the limiting support member 23.

[0162] Multiple bosses 242 are provided to provide multi-point support for the support member 23. The multiple bosses 242 are arranged at intervals to improve the force balance of the support member 23, thereby improving the stability of the support member 23 supported by the insulating member 24, and thus improving the stability of the support member 23 supporting the electrode assembly 22. At the same time, the area between two adjacent bosses 242 can form a channel for accommodating the passage of the conductive member, facilitating the connection between the output electrode and the electrode assembly 22.

[0163] According to some embodiments of this application, please continue to refer to Figure 3 and Figure 4 , and further reference Figures 10 to 12 , Figure 10 for Figure 4 A front view of a partial structure of a battery cell is shown; Figure 11 for Figure 10 A cross-sectional view in the AA direction is shown; Figure 12 for Figure 11 The battery cell 20 further includes an electrode terminal 26 disposed on the first wall 212 and extending through the substrate 241 . The electrode assembly 22 includes a body 221 and a tab 222 extending from the body 221 . The tab 222 bypasses the support member 23 and is electrically connected to the electrode terminal 26 .

[0164] The electrode terminal 26 is disposed on the first wall 212 and is connected to the electrode assembly 22 so as to input or output electrical energy from the battery cell 20. The electrode terminal 26 can be made of various materials, such as copper, iron, aluminum, steel, and aluminum alloy.

[0165] For example, Figure 4 As shown, there are two electrode terminals 26 , and both electrode terminals 26 are installed on the first wall 212 , and the two electrode terminals 26 are respectively a positive terminal 26 a and a negative terminal 26 b .

[0166] In some embodiments, two lead-out holes (not shown in the figure) can be set on the first wall 212, and a through-hole can be set at a position corresponding to the lead-out hole on the substrate 241. The electrode terminal 26 is passed through the lead-out hole and the through-hole and installed on the first wall 212. The electrode terminal 26 realizes the input or output of electrical energy of the battery cell 20.

[0167] Exemplarily, the electrode terminal 26 is insulated and mounted on the first wall 212 , that is, the electrode terminal 26 is not electrically connected to the first wall 212 .

[0168] The main body 221 of the electrode assembly 22 is the component where the electrochemical reaction occurs, and the tab 222 plays the role of outputting or inputting the electrical energy of the electrode assembly 22. Figure 3 and Figure 10 In the embodiment, the electrode assembly 22 has two tabs 222, which are a positive tab 222a and a negative tab 222b. The positive tab 222a is connected to the positive terminal 26a, and the negative tab 222b is electrically connected to the negative terminal 26b.

[0169] The support member 23 is disposed between the electrode assembly 22 and the substrate 241 . The tab 222 bypasses the support member 23 and is electrically connected to the electrode terminal 26 that extends into the housing 21 through the substrate 241 .

[0170] For example, Figure 11 and Figure 12 As shown, the tab 222 may protrude from one end of the main body 221 facing the support member 23 , one end of the tab 222 is connected to the main body 221 , and the other end bypasses the support member along the X direction and is electrically connected to the electrode terminal 26 .

[0171] The electrode terminal 26 is disposed on the first wall 212 to form the output electrode of the battery cell 20 . The tab 222 of the electrode assembly 22 bypasses the support 23 and is connected to the electrode terminal 26 , so that the electrode assembly 22 is electrically connected to the electrode terminal 26 .

[0172] It is understandable that the tab 222 can be directly connected to the electrode terminal 26 by welding, conductive adhesive bonding, etc., or a current collector can be provided, and the tab 222 can be connected to the electrode terminal 26 through the current collector.

[0173] According to some embodiments of this application, please continue to refer to Figure 3 and Figure 11 The battery cell 20 further includes a transition piece 25 disposed between the substrate 241 and the support piece 23 , and the transition piece 25 connects the electrode terminal 26 and the tab 222 .

[0174] Specifically, the adapter 25 forms the above-mentioned current collecting member, and the adapter 25 serves to connect the tab 222 and the electrode terminal 26 to achieve electrical connection between the tab 222 and the electrode terminal 26. The adapter 25 can be made of various materials, such as copper, iron, aluminum, steel, aluminum alloy, etc.

[0175] Exemplarily, there can also be two adapters 25, and the two adapters 25 are arranged in a one-to-one correspondence with the two electrode terminals 26, that is, the positive electrode tab 222a of the electrode assembly 22 is connected to the positive terminal 26a through one adapter 25, and the negative electrode tab 222b of the electrode assembly 22 is connected to the negative terminal 26b through another adapter 25.

[0176] Based on the implementation form of "three bosses 242 are provided, and the three bosses 242 are arranged at intervals along the second direction", the two electrode terminals 26 can also be arranged at intervals along the second direction. Similarly, the two adapters 25 can also be arranged at intervals along the second direction, and each adapter 25 is located between two adjacent bosses 242.

[0177] The battery cell 20 is provided with an adapter 25, and the tab 222 and the electrode terminal 26 are electrically connected through the adapter 25. The provision of the adapter 25 can effectively improve the tensile strength and vibration resistance of the connection between the electrode terminal 26 and the tab 222, which is conducive to further improving the performance stability of the battery 100.

[0178] According to some embodiments of this application, please continue to refer to Figure 12 The electrode assembly 22 includes a main body 221 and a tab 222 extending from the main body 221 . The tab 222 is disposed on a side of the main body 221 facing the support member 23 . The support member 23 is configured to support at least part of the main body 221 and the tab 222 .

[0179] As previously described, the tab 222 protrudes from one end of the main body 221 facing the support member 23. The tab 222 bypasses the support member 23 and is electrically connected to the electrode terminal 26. The tab 222 may include a first section and a second section connected in sequence, the first section being connected to the main body 221, and the second section being connected to the electrode terminal 26. Along the Z direction, the first section is located on the side of the support member 23 facing the main body 221, and the second section bypasses the support member and is located on the side of the support member 23 facing the substrate 241. The support member 23 can simultaneously support the main body 221 and the first section of the tab 222.

[0180] While supporting the main body 221 of the electrode assembly 22, the support member 23 can also provide limited support for the area of the tab 222 located between the support member 23 and the main body 221, further increasing the support area of the electrode assembly 22 by the support member 23 and reducing the risk of decarburization of the electrode assembly 22. Furthermore, the support member 23 supports and shapes the tab 222, effectively reducing the risk of the end of the tab 222 connected to the electrode terminal 26 bending into the electrode assembly 22 and inserting into the electrode sheet, effectively preventing short circuits in the battery cell 20 and further extending the service life of the battery cell 20.

[0181] According to some embodiments of the present application, please refer to Figures and Figure 4 as well as Figure 6 The battery cell 20 also includes a pressure relief mechanism 27, which is arranged on the first wall 212 of the shell 21; the support member 23 is arranged between the first wall 212 and the electrode assembly 22, and the support member 23 is further provided with a through hole 232, which corresponds to the position of the pressure relief mechanism 27.

[0182] The pressure relief mechanism 27 refers to an element or component that releases the internal pressure or temperature of the battery cell 20. The pressure relief mechanism 27 can take the form of an explosion-proof valve, an air valve, a pressure relief valve, or a safety valve, and can specifically employ a pressure-sensitive or temperature-sensitive element or structure. That is, when the internal pressure or temperature of the battery cell 20 reaches a predetermined threshold, the pressure relief mechanism 27 actuates or a weak structure within the pressure relief mechanism 27 is destroyed, thereby forming an opening 2111 or channel for releasing the internal pressure or temperature. The actions produced by the pressure relief mechanism 27 may include, but are not limited to, at least a portion of the pressure relief mechanism 27 rupturing, shattering, tearing, or opening, etc. When the pressure relief mechanism 27 releases pressure, the high-temperature and high-pressure substances within the battery cell 20 are discharged as exhaust from the open channel of the pressure relief mechanism 27. In this way, the pressure and temperature of the battery cell 20 can be released under controllable pressure or temperature.

[0183] Along the Z direction, the position of the support member 23 corresponding to the pressure relief mechanism 27 of the first wall 212 can be provided with one through hole 232, or multiple through holes 232. Exemplarily, the support member 23 is provided with multiple through holes 232, and the multiple through holes 232 all penetrate the support member 23 along the Z direction.

[0184] The support member 23 is provided with a through hole 232 corresponding to the position of the pressure relief mechanism 27 , which effectively reduces the influence of the support member 23 on the pressure relief mechanism 27 and improves the smoothness of the pressure relief of the battery cell 20 .

[0185] According to some embodiments of the present application, the material of the support member 23 includes at least one of polyethylene, polypropylene, polyimide, polytetrafluoroethylene, polyvinyl fluoride, polyvinylidene fluoride, ethylene-tetrafluoroethylene copolymer, propylene-tetrafluoroethylene copolymer, fluorinated ethylene propylene copolymer, and vinylidene fluoride hexafluoropropylene copolymer.

[0186] That is to say, the support member 23 can be prepared using at least one of the above-mentioned polymers. Specifically, the support member 23 can include one of polyethylene, polypropylene, polyimide, polytetrafluoroethylene, polyvinyl fluoride, polyvinylidene fluoride, ethylene-tetrafluoroethylene copolymer, propylene-tetrafluoroethylene copolymer, fluorinated ethylene propylene copolymer, and vinylidene fluoride hexafluoropropylene copolymer. It can also include two or more of polyethylene, polypropylene, polyimide, polytetrafluoroethylene, polyvinyl fluoride, polyvinylidene fluoride, ethylene-tetrafluoroethylene copolymer, propylene-tetrafluoroethylene copolymer, fluorinated ethylene propylene copolymer, and vinylidene fluoride hexafluoropropylene copolymer.

[0187] Exemplarily, the support member 23 can be made of a porous material using a polymer and a pore-forming agent, wherein the polymer can be a polymer such as polyimide that contains rich electrolyte-philic polar groups. The support member 23 made of this material will have better liquid absorption capacity, thereby further improving the ability of the support member 23 to absorb electrolyte, improving the electrolyte infiltration effect on the electrode assembly 22, and improving the long-term performance of the battery cell 20.

[0188] The material of the support member 23 is made of at least one of the above-mentioned polymers. While supporting the electrode assembly 22, it has good insulation performance. At the same time, the support member 23 has good liquid absorption ability, which can effectively improve the wetting effect of the electrolyte on the electrode assembly 22, thereby effectively improving the performance of the battery cell 20.

[0189] According to some embodiments of this application, please refer to Figure 3 The housing 21 includes a shell 211 and a cover 213 . The shell 211 has an opening 2111 . The cover 213 covers the opening 2111 . The support member 23 is disposed between the cover 213 and the electrode assembly 22 .

[0190] As previously described, the housing 211 and the cover 213 together form a closed cavity for housing the electrode assembly 22. When the battery cell 20 is inverted for use, the end of the battery cell 20 with the electrode terminal is positioned toward the bottom of the housing 10 in the Z direction. Alternatively, during actual use, the end of the battery cell 20 with the electrode terminal 26 is positioned toward the ground or downward, such that the Z direction is the vertical direction. The cover 213 is located on the side of the housing 211 facing the bottom of the housing 10, and the electrode terminals of the battery cell 20 are positioned on the cover 213. The support member 23 is positioned between the cover 213 and the electrode assembly 22 to support the electrode assembly 22.

[0191] Some embodiments of the present application provide a battery 100 including a battery cell 20 according to any of the above solutions.

[0192] Some embodiments of the present application provide an electrical device, which includes the battery cell 20 of any of the above solutions, and the battery cell 20 is used to provide electrical energy; or, the electrical device includes the battery 100 of the above solution, and the battery 100 is used to provide electrical energy.

[0193] The electrical device may be any of the aforementioned devices or systems using the battery cell 20 or the battery 100 .

[0194] Please refer to Figure 13 , Figure 13 This is a flow chart of a method for manufacturing a battery cell provided in some embodiments of the present application. Some embodiments of the present application also provide a method for manufacturing a battery cell 20, which mainly includes the following steps:

[0195] S1: Preparation of a porous support member;

[0196] S2: Provide electrode assembly and housing;

[0197] S3: Encapsulate the electrode assembly and the support member in a housing.

[0198] There are various ways to prepare a porous support member 23. For example, a conventional material with a high density can be punched to form a porous support member 23. Another example is to add a pore-forming agent to the material used to form the support member 23, so that the material forms a porous structure after molding, and the porous structure is used as the support member 23.

[0199] The electrode assembly 22 and the housing 21 can be fed manually or by a feeding device. Similarly, the electrode assembly 22 and the support member 23 can be enclosed in the housing 21 by manual or mechanical operation, or, of course, by human-machine collaboration.

[0200] The support member 23 is made into a porous structure, so that the support member 23 has a higher liquid absorption performance, and can reabsorb the electrolyte located around the support member 23 (especially the electrolyte that flows to the side of the support member 23 away from the electrode assembly 22), thereby improving the wetting effect of the electrolyte on the electrode assembly 22, thereby alleviating the problem of reduced performance of the battery cell 20 due to insufficient electrolyte reabsorption, and thus effectively extending the service life of the battery cell 20.

[0201] According to some embodiments of the present application, the porous structure support member 23 is prepared by mainly comprising the following steps: mixing a polymer, a pore-forming agent, and an antioxidant to form a mixture; and sequentially extruding, cooling, extracting, and stretching the mixture to form the support member 23.

[0202] As mentioned above, the polymer may be at least one of polyethylene, polypropylene, polyimide, polytetrafluoroethylene, polyvinyl fluoride, polyvinylidene fluoride, ethylene-tetrafluoroethylene copolymer, propylene-tetrafluoroethylene copolymer, fluorinated ethylene propylene copolymer, and vinylidene fluoride hexafluoropropylene copolymer.

[0203] Pore-forming agents utilize the principle of thermally induced phase separation, exploiting the solid-liquid or liquid-liquid phase separation that occurs during the cooling of a molten mixture. The pore-forming agent is mixed with a polymer and pressed into a membrane sheet, resulting in a base membrane containing the pore-forming agent. After heating to a temperature close to the melting point, the membrane is stretched to align the molecular chains. After a certain period of heat preservation, the pore-forming agent is extracted from the base membrane using a volatile solvent (such as dichloromethane and trichloroethylene), resulting in a submicron-sized microporous membrane material with interconnected micropores. The pore-forming agent can be a high-boiling-point hydrocarbon liquid or a relatively low-molecular-weight substance such as dibutyl phthalate and polyacrylonitrile.

[0204] The main function of antioxidants is to slow down the aging and performance degradation of the base film. Antioxidants can be hindered phenols, phosphites, thiols, composites and hindered amines.

[0205] When preparing the support member, the following process can be specifically adopted: feeding: the polymer, pore-forming agent and other raw materials are mixed and pre-treated and then transported to the extrusion system; casting: the pre-treated mixed raw materials are melted and plasticized in the extrusion system and then extruded from the die head to form a melt containing the pore-forming agent after casting; longitudinal stretching: the cast thick sheet is longitudinally stretched; transverse stretching: the cast thick sheet after longitudinal stretching is transversely stretched to obtain a base membrane containing the pore-forming agent; extraction: the base membrane is extracted with a solvent to form a base membrane without the pore-forming agent; shaping: the base membrane without the pore-forming agent is dried and shaped to obtain a nanoporous membrane; cutting: the nanoporous membrane is cut according to the required size of the support member 23 to obtain the support member 23.

[0206] A pore-forming agent is added to the polymer, and the support member 23 is ultimately formed through processes such as extrusion, extraction, and stretching. The pore-forming agent enables the formation of multiple freely distributed and freely extending pores 233 within the support member 23, thereby enhancing the support member 23's high liquid absorption capacity and improving electrolyte return. Compared to the method of machining straight-through holes 232 for liquid return after the support member 23 is formed, the freely extending pores 233 with smaller pore sizes formed by the pore-forming agent within the support member 23 effectively reduce the risk of carbon powder accumulating within the pores 233 and completely blocking them, thereby fully maximizing the liquid return function of the support member 23.

[0207] Please refer to Figures 3 to 12 In some embodiments of the present application, a battery cell 20 is provided, which includes an outer shell 21, an electrode assembly 22, a support member 23, an insulating member 24, an adapter 25 and an electrode terminal 26. The outer shell 21 includes a shell 211 and a cover 213. The shell 211 has an opening 2111 at one end along the Z direction. The cover 213 covers the opening 2111. The electrode terminal 26 is passed through the cover 213. The electrode assembly 22, the support member 23 and the insulating member 24 are all accommodated in the shell 211. The adapter 25 is arranged between the electrode assembly 22 and the cover 213. The support member 23 is arranged between the electrode assembly 22 and the adapter 25. The insulating member 24 is arranged between the adapter 25 and the cover 213.

[0208] The insulating member 24 includes a base plate 241 and a boss 242. The base plate 241 has a third surface 245 facing the support member 23. The boss 242 protrudes from the third surface 245. There are three bosses 242, spaced apart along the second direction (the Y direction). Each boss 242 has a second surface 244 facing the support member 23, and the second surface 244 has a groove 243. The support member 23 is a flat, porous structure. The thickness of the support member 23 extends along the Z direction. Part of the support member 23 is accommodated in the groove 243. The support member 23 has a first surface 231 facing the electrode assembly 22. The projection of the electrode assembly 22 along the Z direction completely falls within the first surface 231.

[0209] The adapter 25 is arranged between the substrate 241 and the support member 23. The electrode assembly 22 includes a main body 221 and a pole ear 222 extending from the main body 221 toward one end of the cover body 213. The pole ear 222 is connected to the adapter 25 along the first direction X, bypassing the support member 23. The adapter 25 connects the pole ear 222 and the electrode terminal 26.

[0210] When the battery cell 20 is used upside down, the cover 213 is set toward the bottom of the box 10 of the battery 100 in the Z direction, or in actual use, the cover 213 of the battery cell 20 is set toward the ground or downward, so that the Z direction is the up-down direction.

[0211] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0212] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A battery cell, characterized in that: include: shell; an electrode assembly, disposed in the housing; a support member disposed in the housing, the support member being configured to support the electrode assembly; Wherein, the support member has a porous structure so as to be able to absorb the electrolyte.

2. The battery cell according to claim 1, wherein: The porosity of the support member is Vc, which satisfies 30%≤Vc≤60%.

3. The battery cell according to claim 2, characterized in that: 40%≤Vc≤50%.

4. The battery cell according to claim 1, wherein: The support member has a plurality of channels, and the pore diameter of the channels is R, satisfying 30nm≤R≤80nm.

5. The battery cell according to claim 4, characterized in that 50nm≤R≤60nm.

6. The battery cell according to claim 1, characterized in that The support member is a flat plate structure.

7. The battery cell according to claim 6, characterized in that The thickness of the support member is T, which satisfies 0.2 mm ≤ T ≤ 2 mm.

8. The battery cell according to claim 7, characterized in that 1mm≤T≤1.5mm.

9. The battery cell according to claim 1, characterized in that The support member is arranged between the first wall of the shell and the electrode assembly. The support member has a first surface facing the electrode assembly. Along the thickness direction of the first wall, the projection of the electrode assembly completely falls into the first surface.

10. The battery cell according to claim 1, characterized in that The support member is disposed between the first wall of the housing and the electrode assembly, and the battery cell further comprises: an insulating member, disposed between the support member and the first wall; The insulating member has a second surface facing the supporting member, the second surface is provided with a groove, and at least a portion of the supporting member is accommodated in the groove.

11. The battery cell according to claim 10, characterized in that The support member is loosely matched with the groove.

12. The battery cell according to claim 11, characterized in that The dimension of the groove along the first direction is W1, and the dimension of the support member along the first direction is W2, satisfying 0.2 mm < W1 - W2 < 4.0 mm, and the first direction is perpendicular to the thickness direction of the first wall.

13. The battery cell according to claim 10, characterized in that Along the thickness direction of the first wall, the depth of the groove is H, and the thickness of the support member is T, satisfying -0.5mm<HT<0.5mm.

14. The battery cell according to claim 10, characterized in that The insulating member comprises: a substrate having a third surface facing the support member; The boss protrudes from the third surface, and the groove is arranged on the boss.

15. The battery cell according to claim 14, characterized in that There are a plurality of bosses, and the bosses are arranged at intervals along a second direction, and the second direction is perpendicular to the third surface.

16. The battery cell according to claim 14, characterized in that The battery cell further includes an electrode terminal, which is disposed on the first wall and passes through the substrate; the electrode assembly includes a main body and a tab extending from the main body, the tab bypassing the support member and electrically connected to the electrode terminal.

17. The battery cell according to claim 16, characterized in that The battery cell further includes a transition piece disposed between the substrate and the support piece, wherein the transition piece connects the electrode terminal and the tab.

18. The battery cell according to any one of claims 1 to 17, characterized in that: The electrode assembly includes a main body and a tab extending from the main body. The tab is disposed on a side of the main body facing the support member. The support member is configured to support at least a portion of the main body and the tab.

19. The battery cell according to any one of claims 1 to 17, characterized in that: The battery cell further includes a pressure relief mechanism, which is disposed on the first wall of the housing; the support member is disposed between the first wall and the electrode assembly, and the support member is further provided with a through hole, which corresponds to the position of the pressure relief mechanism.

20. The battery cell according to any one of claims 1 to 17, characterized in that: The support member is made of at least one of polyethylene, polypropylene, polyimide, polytetrafluoroethylene, polyvinyl fluoride, polyvinylidene fluoride, ethylene-tetrafluoroethylene copolymer, propylene-tetrafluoroethylene copolymer, fluorinated ethylene propylene copolymer, and vinylidene fluoride hexafluoropropylene copolymer.

21. The battery cell according to any one of claims 1 to 17, characterized in that: The housing comprises: a housing having an opening; The cover body covers the opening, and the support member is arranged between the cover body and the electrode assembly.

22. A battery, characterized in that: The invention comprises the battery cell according to any one of claims 1 to 21.

23. An electrical device, characterized in that: The method comprises a battery cell according to any one of claims 1 to 21, wherein the battery cell is used to provide electrical energy; or the method comprises a battery according to claim 22, wherein the battery is used to provide electrical energy.

24. A method for manufacturing a battery cell, for manufacturing the battery cell according to any one of claims 1 to 21, characterized in that: The manufacturing method of the battery cell includes: preparing a support member with a porous structure; providing electrode assemblies and housings; The electrode assembly and the support member are enclosed in the housing.

25. The method for manufacturing a battery cell according to claim 24, wherein: The method for preparing a porous structure support member comprises: mixing a polymer, a pore former, and an antioxidant to form a mixture; The mixed material is sequentially extruded, cooled, extracted, and stretched to form the support member.

Images