Battery monomer, battery, power utilization device and preparation method of battery monomer

Abstract

The invention provides a battery monomer, a battery, a power utilization device and a preparation method of the battery monomer, and the battery monomer comprises a shell with an opening; the end cover assembly is used for sealing the opening; the electrode assembly is accommodated in the shell; and the accommodating part is accommodated in the shell, and the accommodating part is used for accommodating an electrode assembly and an electrolyte. According to the technical scheme, the containing part is arranged in the shell, the electrolyte and the electrode assembly are contained in the containing part together, the containing part can isolate the electrolyte, the shell and the end cover assembly to a certain extent, and the containing part plays a certain secondary sealing role on the electrolyte; therefore, the risk that the electrolyte corrodes the shell and the end cover assembly can be reduced, and the risk that the electrolyte leaks from the joint of the shell and the end cover assembly to influence the performance of the battery due to connection failure of the shell and the end cover assembly can be reduced, so that the performance reliability of the battery is improved.

Description

Battery cell, battery, electrical device and method for preparing battery cell 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 preparing 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 improve battery reliability is an urgent problem to be solved.

[0004] Summary of the Invention

[0005] The embodiments of the present application provide a battery cell, a battery, an electrical device, and a method for preparing the battery cell, which can improve the reliability of the battery.

[0006] In a first aspect, the present application provides a battery cell, comprising: a shell having an opening; an end cover assembly closing the opening; an electrode assembly housed in the shell; and a receiving component housed in the shell, the receiving component being used to accommodate the electrode assembly and an electrolyte.

[0007] In the technical solution of the present application, a receiving component is provided in the shell, and the electrolyte and the electrode assembly are received together in the receiving component. The receiving component can isolate the electrolyte from the shell and the end cover assembly to a certain extent, and the receiving component plays a certain secondary sealing role for the electrolyte, thereby reducing the risk of electrolyte corrosion of the shell and the end cover assembly, and reducing the risk of battery performance being affected by failure of the connection between the shell and the end cover assembly and leakage of electrolyte from the connection between the shell and the end cover assembly, thereby improving the reliability of the battery performance.

[0008] According to some embodiments of the present application, the end cap assembly includes an electrode terminal, the receiving component is provided with a first through hole, the electrode assembly includes an electric energy lead-out component, the electric energy lead-out component is located in the receiving component, the area corresponding to the electric energy lead-out component and the first through hole forms a first exposed area, and the first exposed area is connected to the electrode terminal.

[0009] In the above technical solution, the receiving component is provided with a first through hole, which facilitates the mutual connection between the electrode terminal of the end cover assembly and the electrode assembly, and meets the requirement of mutual connection between the power lead-out piece and the electrode terminal; at the same time, the first through hole opened on the receiving component is relatively small, allowing only part of the power lead-out piece to be exposed and connected to the electrode terminal, thereby improving the sealing and isolation effectiveness of the receiving component, minimizing the risk of electrolyte leakage from the receiving component, and further improving the performance reliability of the battery.

[0010] According to some embodiments of the present application, the power lead-out member blocks the first through hole.

[0011] In the above technical solution, the power lead-out member directly blocks the first through hole to further reduce the risk of electrolyte leaking out of the receiving component from the gap between the power lead-out member and the first through hole, thereby improving the packaging effect of the receiving component on the electrolyte, thereby further improving the reliability of the battery.

[0012] According to some embodiments of the present application, the first exposed area has a protrusion, and the protrusion passes through the first through hole and is connected to the electrode terminal.

[0013] In the above technical solution, a protrusion passing through the first through hole is formed at the position of the first exposed area. The protrusion can limit the relative position of the receiving component and the electric energy lead-out component when the battery cell is assembled, thereby facilitating grouping; and the protrusion extends out of the receiving component through the first through hole of the receiving component, thereby facilitating the connection between the electrode terminal and the electric energy lead-out component; in addition, the protrusion penetrates into the first through hole, which can play a role in sealing the first through hole to a certain extent or reducing the gap between the electric energy lead-out component and the first through hole, thereby further reducing the risk of electrolyte leakage through the first through hole and improving the reliability of the battery.

[0014] According to some embodiments of the present application, the electrode assembly includes a main body and a tab, wherein the tab protrudes from the main body and forms the electric energy lead-out member.

[0015] In the above technical solution, the tab of the electrode assembly can directly extend to the position of the first through hole of the receiving component, so that the tab covers the first through hole and has a first exposed area exposed through the first through hole, and the first exposed area of ​​the tab is directly connected to the electrode terminal.

[0016]

[0017] According to some embodiments of the present application, the electrode assembly further includes a main body and a tab, wherein the tab protrudes from the main body, and the power lead-out member is connected to the tab to achieve electrical connection between the tab and the electrode terminal.

[0018] In the above technical solution, the power lead-out member connects the electrode tab and the electrode terminal, thereby realizing the electrical connection between the electrode terminal and the electrode assembly.

[0019] According to some embodiments of the present application, the power lead-out component is fixedly connected to the receiving component.

[0020] In the above technical solution, the power lead-out member is fixedly connected to the receiving component, and the relative positions of the power lead-out member and the receiving component are fixed, thereby reducing the risk of displacement of the receiving component or the power lead-out member, improving the fixity of the relative position of the first exposed area, thereby improving the stability of the connection between the power lead-out member and the electrode terminal, and also helping to improve the performance reliability of the battery.

[0021] According to some embodiments of the present application, the power lead-out component and the receiving component are connected to form a connection area, and the connection area is an annular structure arranged around the outer periphery of the first through hole.

[0022] In the above technical solution, the connection area between the power lead-out member and the receiving component forms an annular structure, which is located on the periphery of the first through hole. The connection area not only fixes the relative positions of the power lead-out member and the receiving component, but also seals the power lead-out member and the receiving component. The connection area can prevent the electrolyte from entering the first through hole through the gap between the power lead-out member and the receiving component and leaking out of the receiving component from the first through hole, thereby further improving the sealing of the receiving component and helping to further improve the performance reliability of the battery.

[0023] According to some embodiments of the present application, the power lead-out component and the receiving component are bonded together by an adhesive layer.

[0024] In the above technical solution, the power lead-out member and the receiving member are bonded together by an adhesive layer, which has a simple process, few material restrictions, and facilitates the assembly operation of the battery cell.

[0025] According to some embodiments of the present application, the end cover assembly includes an end cover and the electrode terminal, the end cover closes the opening, and the electrode terminal is arranged on the end cover; the receiving component includes a first wall, along the thickness direction of the end cover, the first wall is located between the end cover and the electrode assembly, and the first through hole is arranged on the first wall.

[0026] In the above technical solution, the first through hole of the receiving component is located on the first wall of the receiving component facing the end cover, which can minimize the connection distance between the electrode terminal and the power lead-out member, facilitate the assembly operation of the battery cell, and save the internal space of the shell, which is beneficial to improving the energy density of the battery cell.

[0027] According to some embodiments of the present application, the end cap assembly includes two electrode terminals, two power lead-out members and two first through holes are provided, and both the power lead-out members and the first through holes correspond one-to-one to the electrode terminals.

[0028] In the above technical solution, two first through holes are provided on the receiving component, and the two first through holes correspond one-to-one to the two power lead-out parts of the battery cell, which can prevent the problem of one first through hole being compatible with the connection of two power lead-out parts due to the need to reserve avoidance space, thereby reducing the risk of the first through hole being too large and affecting the packaging effect of the receiving component on the electrolyte, thereby reducing the risk of electrolyte leakage and improving the performance reliability of the battery.

[0029] According to some embodiments of the present application, the end cap assembly includes an electrode terminal, and the electrode assembly includes a main body and an electric energy lead-out member, the main body is located inside the receiving component, and the electric energy lead-out member is located outside the receiving component and connected to the electrode terminal; wherein, the receiving component is provided with a first through hole, the electric energy lead-out member covers the first through hole, and the area corresponding to the electric energy lead-out member and the first through hole forms a second exposed area, and the second exposed area is connected to the main body to achieve electrical connection between the main body and the electrode terminal.

[0030] In the above technical solution, the power lead-out piece can be arranged outside the receiving component, and the main body of the electrode assembly and the power lead-out piece can be directly or indirectly connected to each other through the first through hole. The power lead-out piece is located outside the receiving component to facilitate the connection operation between the power lead-out piece and the electrode terminal.

[0031] According to some embodiments of the present application, the receiving component is made of an insulating material.

[0032] In the above technical solution, the receiving component is made of insulating material. When the shell is made of metal, the receiving component can play a role of insulation and isolation, which is also beneficial to improving the reliability of the battery.

[0033] According to some embodiments of the present application, the material of the receiving component includes at least one of polypropylene and polyethylene terephthalate.

[0034] In the above technical solution, the material of the receiving component includes at least one of polypropylene and polyethylene terephthalate, which is a mature material with a stable structure. The receiving component made of the above material has good deformation performance, which is convenient for the assembly of battery cells, and has good tensile strength, and can more reliably contain electrolytes, thereby improving the performance reliability of the battery; and when the battery cell suffers from thermal runaway, the receiving component can be destroyed at high temperature, which is convenient for maintaining unobstructed pressure relief of the battery cell, and is also beneficial to improving the performance reliability of the battery.

[0035] According to some embodiments of the present application, the end cover assembly is provided with a liquid injection hole, and the liquid injection hole is connected to the interior of the receiving component.

[0036] In the above technical solution, the end cover assembly is provided with a liquid injection hole, which facilitates the injection of electrolyte into the receiving component through the liquid injection hole.

[0037] According to some embodiments of the present application, the end cap assembly includes an end cap and an electrode terminal, the end cap closes the opening, the electrode terminal is arranged on the end cap, the electrode terminal is electrically connected to the electrode assembly, and the injection hole is arranged on the electrode terminal.

[0038] In the above technical solution, the injection hole is integrated into the electrode terminal, which can reduce the number of openings in the end cover itself. At the same time, the electrode terminal and the electrode assembly are connected, and the electrolyte in the injection hole can enter the receiving component with the help of the connection between the electrode terminal and the electrolytic assembly. Compared with the structure in which a separate hole is opened on the receiving component to connect the injection hole with the receiving component, the destructive processing of the receiving component can be reduced, the isolation effect of the receiving component can be improved, and thus the reliability of the battery can be improved.

[0039] According to some embodiments of the present application, the receiving component is provided with a first through hole, the electrode assembly includes an electric energy lead-out part, the electric energy lead-out part is located in the receiving component, the area corresponding to the electric energy lead-out part and the first through hole forms a first exposed area, and the first exposed area is connected to the electrode terminal; the first exposed area is provided with a second through hole, and the second through hole connects the liquid injection hole and the interior of the receiving component.

[0040] In the above technical solution, the electric energy lead-out part has a first exposed area exposed from the first through hole of the receiving component, and the electrode terminal is connected to the first exposed area. At the same time, a second through hole is provided on the first exposed area, and the injection hole in the electrode terminal is connected to the second through hole, so that the injection hole can be connected to the interior of the receiving component. Its structural integration is strong. A through hole is opened in the receiving component to meet the two requirements of mutual connection between the electrode assembly and the electrode terminal and internal connection between the injection hole and the receiving component. While meeting the various functional requirements of the battery cell, the destructive processing of the receiving component is minimized, the integrity and sealing of the receiving component are improved, thereby reducing the risk of electrolyte leakage from the receiving component, and then reducing the leakage risk of the battery cell, and improving the reliability of the battery cell.

[0041] According to some embodiments of the present application, along the thickness direction of the end cover, the liquid injection hole and the second through hole are arranged opposite to each other.

[0042] In the above technical solution, the injection hole and the second through hole have an overlapping area along the thickness direction of the end cover, and the electrolyte flowing out of the injection hole can directly enter the second through hole, shortening the injection path as much as possible, reducing the risk of leakage during the injection of electrolyte into the receiving component, and also helping to improve the reliability of the battery cell.

[0043] According to some embodiments of the present application, the electrode terminal and the first exposed area are welded to form a welding area, and the welding area is an annular structure arranged around the outer periphery of the liquid injection hole.

[0044] In the above technical solution, the electrode terminal is welded to the first exposed area to form a welding area, which can improve the connection stability between the electrode terminal and the power lead-out member; the welding area forms an annular structure on the periphery of the injection hole, which can seal the connection between the injection hole and the second through hole, further reducing the risk of leakage during the injection of electrolyte into the receiving component, and improving the reliability of the battery cell.

[0045] According to some embodiments of the present application, the end cap assembly includes two electrode terminals, one of which is a positive terminal and the other is a negative terminal, and the injection hole is provided at the positive terminal.

[0046] In the above technical solution, the shell may be negatively charged, which may cause the shell to corrode and leak. The injection hole is set at the positive terminal, which can reduce the insulation protection requirements between the injection hole and the electrode terminal. Even if the electrolyte conducts the positive terminal and the shell, the shell will be positively charged, thereby reducing the risk of shell corrosion and leakage, and improving the reliability of the battery.

[0047] According to some embodiments of the present application, the end cap assembly includes two electrode terminals, and the injection holes correspond one-to-one to the electrode terminals.

[0048] In the above technical solution, both electrode terminals are provided with injection holes, which can improve the injection efficiency of the battery cell.

[0049] According to some embodiments of the present application, the end cap assembly includes an end cap and an electrode terminal, the end cap closes the opening, the electrode terminal is disposed on the end cap and electrically connected to the electrode assembly, and the end cap is configured to support the electrode assembly.

[0050] In the above technical solution, the end cap supports the electrode assembly, that is, the end cap assembly of the battery cell can be set downward, and the receiving component can reduce the risk of electrolyte leakage through the connection between the end cap assembly and the shell, the connection between the end cap and the electrode terminal, and the connection between the explosion-proof valve that may be set on the end cap and the end cap, thereby improving the performance reliability of the battery.

[0051] In a second aspect, the present application provides a battery comprising a battery cell as described in any one of the above items.

[0052] In a third aspect, the present application provides an electrical device, comprising a battery cell as described in any one of the above items, wherein the battery cell is used to provide electrical energy; or, comprising a battery as described in any one of the above items, wherein the battery is used to provide electrical energy.

[0053] In a fourth aspect, the present application provides a method for preparing a battery cell, comprising: providing a shell, an end cover assembly, an electrode assembly and a receiving component; accommodating the electrode assembly in the receiving component; accommodating the electrode assembly and the receiving component in the shell; closing the opening of the shell with the end cover assembly; and injecting electrolyte into the receiving component.

[0054] In the above technical solution, the electrode assembly is first loaded into the receiving component, and then the receiving component containing the electrode assembly is loaded into the shell, and the opening of the shell is closed by the end cover assembly to complete the structural assembly of the battery cell. After the structural assembly is completed, the electrolyte is finally injected into the receiving component so that the electrolyte is loaded in the receiving component. The receiving component and the shell play a double packaging role for the electrolyte, thereby reducing the risk of electrolyte leakage and improving the reliability of the battery cell.

[0055] According to some embodiments of the present application, accommodating the electrode assembly in the receiving component includes: loading the electrode assembly into the receiving component through an inlet of the receiving component; and sealing the inlet.

[0056] In the above technical solution, the receiving component is provided with an entrance, which facilitates the installation of the electrode assembly into the receiving component through the entrance of the receiving component. After the electrode assembly is installed in the receiving component, the entrance of the receiving component is sealed, which can improve the structural sealing of the receiving component, thereby improving the packaging effect of the receiving component on the electrolyte, reducing the risk of leakage of the receiving component, and thus improving the reliability of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] 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 of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without creative work.

[0058] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0059] FIG2 is an exploded view of a battery provided in some embodiments of the present application;

[0060] FIG3 is an exploded view of a battery cell provided in some embodiments of the present application;

[0061] FIG4 is a partial cross-sectional view of portion A shown in FIG3 in some embodiments;

[0062] FIG5 is a cross-sectional view of the portion A shown in FIG4 taken along line BB;

[0063] FIG6 is a partial cross-sectional view of the portion A shown in FIG3 in still other embodiments;

[0064] FIG7 is a cross-sectional view of the portion A shown in FIG6 taken along line CC;

[0065] FIG8 is a partial cross-sectional view of portion A shown in FIG3 in some other embodiments;

[0066] FIG9 is a cross-sectional view of the portion A shown in FIG8 taken along line DD;

[0067] FIG10 is a top view of an end cap assembly provided in some embodiments of the present application;

[0068] FIG11 is a cross-sectional view taken along line EE shown in FIG10 ;

[0069] FIG12 is a partial cross-sectional diagram of the connection relationship between the end cap assembly and the receiving component provided in some embodiments of the present application;

[0070] FIG13 is an exploded view of a battery cell provided in some further embodiments of the present application;

[0071] FIG14 is a schematic flow chart of a method for preparing a battery cell according to some embodiments of the present application.

[0072] In the drawings, the drawings are not drawn to scale. Marking instructions: 1000-vehicle; 100-battery; 10-housing; 11-first part; 12-second part; 20-battery cell; 21-end cover assembly; 211-end cover; 212-electrode terminal; 2121-positive terminal; 2122-negative terminal; 2123-end face; 22-housing; 221-opening; 222-accommodating space; 23-accommodating component; 231-first wall; 232-first through hole; 24-electrode assembly; 241-main body; 242-ear; 243-electric energy lead-out piece; 2431-first exposed area; 2432-protrusion; 24321-connecting surface; 2433-second through hole; 2434-second exposed area; 25-connecting area; 26-liquid injection hole; 27-welding area; 28-pressure relief part; 200-controller; 300-motor. DETAILED DESCRIPTION

[0073] 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.

[0074] 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 be closed-ended, 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.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] The term "plurality" used in this application refers to two or more (including two).

[0080] In the present application, the battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-ion batteries, magnesium-ion batteries, etc., which are not limited in the embodiments of the present application.

[0081] 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. The battery may also include a casing for enclosing one or more battery cells or multiple battery modules. The casing prevents liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0082] A battery cell includes an electrode assembly and an electrolyte. The main body of the electrode assembly consists of a positive electrode sheet, a negative electrode sheet, and a separator. The battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode collector to form a positive electrode sheet. The electrode assembly also includes a positive electrode tab. The positive electrode tab can be integrally formed with the positive electrode sheet. For example, the portion of the positive electrode collector that is not coated with the positive electrode active material layer can be directly used as a positive electrode tab to realize the input or output of electrical energy to the positive electrode sheet through the positive electrode tab. Taking lithium-ion batteries as an example, the material of the positive electrode collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode current collector to form the negative electrode sheet. The electrode assembly also includes a negative electrode tab. The negative electrode tab can be integrally formed with the negative electrode sheet. For example, the portion of the negative electrode current collector not coated with the negative electrode active material layer can directly serve as the negative electrode tab to enable the input or output of electrical energy to the negative electrode sheet through the negative electrode tab. The material of the negative electrode current collector can be copper, and the negative electrode active material can be carbon or silicon, etc. In order to ensure that large currents can pass without melting, the number of positive electrode tabs can be multiple and stacked together, and the number of negative electrode tabs can also be multiple and stacked together.

[0083] 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.

[0084] The electrode assembly may further include an electric energy lead-out member, which may be the aforementioned electrode tab, or a separately provided current-carrying component connected to the electrode tab to achieve electric energy input or output of the electrode sheet.

[0085] With the continuous development of battery technology, how to improve battery reliability is a technical problem that needs to be solved urgently.

[0086] For a typical battery cell, a battery cell is typically assembled into an electrode assembly (bare cell) by winding or laminating a positive electrode sheet, a negative electrode sheet, and a separator. 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 end caps of the battery cell. The electrode terminals can be directly or indirectly connected to the tabs of the electrode assembly to achieve electrical connection between the electrode terminals and the electrode assembly. The electrode terminals serve as the output terminals of the battery cell, enabling the input or output of electrical energy from the battery cell.

[0087] However, the inventors of this application have discovered that battery cells are prone to leakage, and the leakage of battery cells will affect the performance of the battery cells. Moreover, after multiple battery cells are combined into a battery, if the electrolyte leaks from the battery cells and there is a high-voltage circuit in a part of the battery, the electrolyte is likely to ignite and cause thermal runaway of the battery, seriously affecting the reliability of the battery.

[0088] The inventor analyzed the causes of leakage of battery cells and found that: the shell and end cover of the battery cell are usually welded to each other, and are connected to the electrode terminals of the battery cell through a busbar component to realize series, parallel or mixed connection between multiple battery cells. During the later use of the battery with this structure, due to the shaking or movement of the battery cell, the busbar component connected to the electrode terminal of the battery cell will generate a certain pulling force or torsional force on the electrode terminal. Since the electrode terminal is installed on the end cover, the force exerted by the busbar component on the electrode terminal will be transmitted to the end cover through the electrode terminal, causing a certain pulling or torsional effect on the end cover, which will cause the end cover and the shell to easily suffer from long-term fatigue stress and other connection failure phenomena such as weld cracking, which will cause the battery cell to have a greater risk of leakage. After the electrolyte contacts the shell or end cover, it is easier to conduct the shell or end cover, causing the battery cell shell to corrode, further increasing the risk of leakage. Especially when the battery cell is used upside down (that is, the side of the battery cell with the electrode terminal is arranged downward in the direction of gravity), the weld between the top cover and the shell is located below the battery cell. Once the welding interface fails, electrolyte leakage is more likely to occur, seriously affecting the reliability of the battery cell and the battery using the battery cell.

[0089] Based on the above reasons, in order to improve the reliability of the battery, the inventors of the present application designed a battery cell, in which a receiving component is provided in a housing, an electrode assembly is accommodated in the receiving component, and an electrolyte is injected into the receiving component.

[0090] In the technical solution of the present application, the receiving component can isolate the electrolyte from the shell and the end cover assembly to a certain extent, and the receiving component plays a certain secondary sealing role for the electrolyte, thereby reducing the risk of electrolyte corrosion of the shell and the end cover assembly, and reducing the risk of battery performance being affected by failure of the connection between the shell and the end cover assembly and leakage of electrolyte from the connection between the shell and the end cover assembly, thereby improving the reliability of the battery performance.

[0091] The battery cells disclosed in the embodiments of this 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 herein can be used to construct such electrical devices. This effectively mitigates issues such as leakage during battery cell use, thereby increasing the battery cell's service life and reliability.

[0092] 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.

[0093] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device.

[0094] Please refer to Figure 1, which is a schematic structural diagram of a vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 can be provided at the bottom, head or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000. For example, the battery 100 can serve as an operating power source for the vehicle 1000. The vehicle 1000 may also 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, for starting, navigating and driving the vehicle 1000.

[0095] 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.

[0096] Please refer to Figure 2, which is an exploded view of a battery 100 provided in some embodiments of the present application. The battery 100 may include a housing 10 and battery cells 20, with the battery cells 20 being housed within the housing 10. The housing 10 provides assembly space for the battery cells 20 and may have various structures. In some embodiments, the housing 10 may include a first portion 11 and a second portion 12, which overlap each other and together define an assembly space for accommodating the battery cells 20. The first portion 11 may be a hollow structure with one end open, and the second portion 12 may be a plate-like structure, overlapping the open side of the first portion 11, thereby jointly defining the assembly space. The first portion 11 and the second portion 12 may also be hollow structures with one end open, with the open side of the first portion 11 overlapping the open side of the second portion 12. Of course, the housing 10 formed by the first portion 11 and the second portion 12 may have various shapes, such as a cylinder, a rectangular parallelepiped, etc.

[0097] In the battery 100, there may be multiple battery cells 20, which may be connected in series, in parallel, or in a hybrid configuration. A hybrid configuration refers to a combination of series and parallel connections within the battery cells 20. The battery cells 20 may be directly connected in series, in parallel, or in a hybrid configuration, 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 configuration to form a battery module, which may then be connected in series, in parallel, or in a hybrid configuration to form a single unit housed within the housing 10.

[0098] Each battery cell 20 may be a secondary battery or a primary battery, and may also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be cylindrical, flat, rectangular, or in other shapes.

[0099] Please refer to Figure 3, which is an exploded view 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 22, an end cover assembly 21, an electrode assembly 24 and a receiving component 23, the shell 22 has an opening 221, the end cover assembly 21 closes the opening 221 of the shell 22, the electrode assembly 24 is accommodated in the shell 22, the receiving component 23 is also accommodated in the shell 22, and the receiving component 23 is used to accommodate the electrode assembly 24 and the electrolyte.

[0100] The housing 22 provides a housing space 222 for the electrode assembly 24, the receiving component 23, and other components, as well as the electrolyte. The housing 22 and the end cap assembly 21 together form a closed cavity for the electrode assembly 24, the receiving component 23, and other components, as well as the electrolyte. The housing 22 can have various structural forms and can be made of a variety of materials, such as copper, iron, aluminum, steel, and aluminum alloys.

[0101] The end cover assembly 21 may include an end cover 211 for covering the opening 221 of the shell 22 and an electrode terminal 212 arranged on the end cover 211. The electrode terminal 212 is electrically connected to the electrode assembly 24. The electrode terminal 212 serves as the output pole of the battery cell 20 and can realize the input or output of electrical energy of the battery cell 20.

[0102] In some embodiments, the end cap assembly 21 may further include a pressure relief portion 28 disposed on the end cap 211 (for releasing the internal pressure of the battery cell 20 ). Of course, in other embodiments, the end cap assembly 21 may also not include the electrode terminal 212 , that is, the electrode terminal 212 may be disposed on the housing 22 .

[0103] The housing 22 can have a variety of shapes, such as a cylinder, a rectangular parallelepiped, etc. The shape of the housing 22 can be determined based on the specific shape of the electrode assembly 24. For example, if the electrode assembly 24 has a cylindrical structure, the housing 22 can be cylindrical; if the electrode assembly 24 has a rectangular parallelepiped structure, the housing 22 can be rectangular. Of course, the end cap 211 can also have a variety of structures, such as a plate-like structure or a hollow structure with one end open. For example, in Figure 3, the housing 22 has a rectangular parallelepiped structure and the end cap 211 has a plate-like structure.

[0104] The electrode assembly 24 is the component within the battery cell 20 where the electrochemical reaction occurs. The main body of the electrode assembly 24 may include a positive electrode sheet, a negative electrode sheet, and a separator. The main body of the electrode assembly 24 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.

[0105] Optionally, the number of electrode assemblies 24 housed within the housing may be one or more. For example, in FIG3 , there are two electrode assemblies 24, which are stacked along the thickness direction (the X direction shown in FIG3 ), i.e., the two electrode assemblies 24 are stacked along the thickness direction of the battery cell 20. Of course, in other embodiments, the number of electrode assemblies 24 housed within the housing may also be three, four, five, or six, etc., stacked.

[0106] Electrolytes can be divided into liquid electrolytes, semi-solid (gel polymer) electrolytes and solid electrolytes. In the embodiment of the present application, the electrolyte uses a liquid electrolyte, also called an electrolyte.

[0107] The receiving component 23 is disposed within the housing 22 and houses the electrode assembly 24 and the electrolyte. It is understood that the receiving component 23 can house a portion of the electrode assembly 24. For example, the receiving component 23 houses the main body of the electrode assembly 24, while the tabs 242 of the electrode assembly 24 and other conductive members for input or output of electrical energy (hereinafter referred to as electrical energy lead-out members) can partially extend from the receiving component 23 to enable input or output of electrical energy to the battery cell 20. Of course, the electrode assembly 24 can also be entirely housed within the receiving component 23, with the electrode terminals 212 or other conductive members extending into the receiving component 23 to connect to the electrode assembly 24.

[0108] The electrolyte can be encapsulated in the receiving part 23 and in direct contact with the electrode assembly 24 to wet the electrode assembly 24. It can be understood that the electrolyte can be injected into the receiving part 23 and then the receiving part 23 containing the electrolyte and the electrode assembly 24 can be encapsulated in the shell 22, or the receiving part 23 containing the electrode assembly 24 can be installed in the shell 22 and covered with the end cover 211, and finally the electrolyte is injected into the receiving part 23 in the shell 22.

[0109] Among them, the receiving component 23 has a variety of implementation forms, and the receiving component 23 can be in a variety of shapes, such as a cylinder, a rectangular parallelepiped, etc. The shape of the receiving component 23 can be determined according to the shape of the shell 22. For example, if the shell 22 is a cylindrical structure, the receiving component 23 can adopt a cylindrical structure; if the shell 22 is a rectangular parallelepiped structure, the receiving component 23 can adopt a rectangular parallelepiped structure. It can be understood that the receiving component 23 can be a rigid structure or a flexible structure (that is, the receiving component 23 can be deformed, such as a certain deformation after the electrolyte is injected or it can be adaptively deformed according to the shape of the accommodating space 222 after being encapsulated in the shell 22 and the end cover assembly 21).

[0110] In different embodiments, the material of the receiving component 23 can also have various implementation structures. For example, when the housing 22 is made of an insulating material, the receiving component 23 can be made of an insulating material or a metal material. When the housing 22 is made of a metal material, the receiving component 23 can be made directly of an insulating material. This can eliminate the need to separately install an insulating member or insulating layer between the receiving component 23 and the housing 22, simplifying the manufacturing process of the battery cell 20 and saving internal space in the housing 22. For example, the material of the receiving component 23 is an insulating material. In this way, the receiving component 23 can serve as an insulating isolation, which is beneficial for improving the reliability of the battery 100.

[0111] It is understandable that there are various implementations of the receiving component 23 being made of insulating materials. For example, the receiving component 23 can be made of silicone, resin, or polyimide.

[0112] In some embodiments, the material of the receiving component 23 may include at least one of polypropylene and polyethylene terephthalate. That is, the receiving component 23 can be made of polypropylene, polyethylene terephthalate, or a mixture of polypropylene and polyethylene terephthalate (the ratio of polypropylene and polyethylene terephthalate is not limited to a unique limit). The receiving component 23 made of the above-mentioned material has good deformation properties, which is convenient for the assembly of the battery cell 20, and has good tensile strength, can more reliably accommodate electrolytes, and improve the performance reliability of the battery 100; and when the battery cell 20 has thermal runaway, the receiving component 23 can be destroyed at high temperature, which is convenient for maintaining the pressure relief of the battery cell 20, and is also beneficial to improving the performance reliability of the battery 100.

[0113] A receiving component 23 is provided in the shell 22 of the battery cell 20, and the electrolyte and the electrode assembly 24 are housed together in the receiving component. The receiving component can isolate the electrolyte from the shell 22 and the end cover assembly 21 to a certain extent, and the receiving component plays a certain secondary sealing role for the electrolyte, thereby reducing the risk of electrolyte corrosion of the shell 22 and the end cover assembly 21, and reducing the risk of affecting the performance of the battery 100 due to failure of the connection between the shell 22 and the end cover assembly 21 and leakage of electrolyte from the connection between the shell 22 and the end cover assembly 21, thereby improving the reliability of the performance of the battery 100.

[0114] In some embodiments, please continue to refer to FIG3 and further refer to FIG4 to FIG5 . FIG4 is a partial cross-sectional view of portion A shown in FIG3 in some embodiments, and FIG5 is a cross-sectional view taken along line BB of portion A shown in FIG4 . The end cap assembly 21 includes an electrode terminal 212 . The receiving component 23 is provided with a first through hole 232 . The electrode assembly 24 includes an electric energy lead 243 . The electric energy lead 243 is located within the receiving component 23 . The area corresponding to the electric energy lead 243 and the first through hole 232 forms a first exposed area 2431 . The first exposed area 2431 is connected to the electrode terminal 212 .

[0115] As previously mentioned, the end cap assembly 21 may include a structure such as a carrier for covering the opening 221 of the housing 22, a carrier for mounting the electrode terminal 212 (such as an end cap 211, hereinafter collectively referred to as the end cap 211), and an electrode terminal 212 disposed on the end cap 211. The end cap 211 may be a plate-like structure or a hollow structure with an opening 221 at one end. The end cap 211 covers the opening 221 of the housing 22 to form a closed space. The electrode terminal 212 is used to electrically connect to the electrode assembly 24. The electrode terminal 212 may serve as the output pole of the battery cell 20 to enable the input or output of electrical energy from the battery cell 20. The electrode terminal 212 may be made of a variety of materials, such as copper, iron, aluminum, steel, aluminum alloy, etc.

[0116] As shown in FIG3 , each battery cell 20 may be provided with two electrode terminals 212, namely a positive terminal 2121 and a negative terminal 2122. The positive terminal 2121 is directly or indirectly connected to the positive electrode tab of the electrode assembly 24, and the negative terminal 2122 is directly or indirectly connected to the negative electrode tab of the electrode assembly 24. Both electrode terminals 212 may be located in the end cap assembly 21. Of course, in other embodiments, the end cap assembly 21 may include only one electrode terminal 212, and the other electrode terminal 212 may be provided in the housing 22.

[0117] The first through hole 232 is provided in the receiving part 23 to connect the inside of the receiving part 23 and the outside of the receiving part 23. The first through hole 232 can be provided at any position of the receiving part 23. The first through hole 232 can be any conventional shape such as circular, rectangular, etc., or other special shapes.

[0118] The power lead-out member 243 serves as a connection and current passage, and is used to connect the main body of the electrode assembly 24 and the electrode terminal 212, thereby achieving electrical connection between the main body of the electrode assembly 24 and the electrode terminal 212, and enabling power input and output of the electrode assembly 24. The power lead-out member 243 has various implementations, and several specific implementations of the power lead-out member 243 are described below.

[0119] The power lead 243 is located within the receiving component 23. When viewed along the axial direction of the first through hole 232 (the X direction shown in the figure), at least a portion of the power lead 243 can be exposed from the first through hole 232 to form a first exposed area 2431. The electrode terminal 212 provided on the end cap 211 can be connected to the first exposed area 2431 by welding, clamping, conductive adhesive bonding, etc., thereby achieving electrical connection between the electrode terminal 212 and the electrode assembly 24.

[0120] Alternatively, a portion of the electrode terminal 212 may extend into the first through-hole 232 and connect to the first exposed area 2431, or at least a portion of the first exposed area 2431 may protrude from the first through-hole 232 and connect to the electrode terminal 212. Alternatively, the electrode terminal 212 and at least a portion of the first exposed area 2431 may extend toward each other and connect within the first through-hole 232.

[0121] It is understood that only one or more first through-holes 232 may be provided. For example, based on the embodiment in which the end cap assembly 21 includes two electrode terminals 212, only one first through-hole 232 may be provided so that both electrode terminals 212 can be electrically connected to the electrode assembly 24 through the first through-hole 232. Of course, two first through-holes 232 may also be provided so that the position where the power lead-out member 243 connects to the two electrode terminals 212 forms two independent first exposed areas 2431. The two electrode terminals 212 are connected to the two first exposed areas 2431 in a one-to-one correspondence.

[0122] The receiving component 23 is provided with a first through hole 232, which facilitates the mutual connection between the electrode terminal 212 of the end cover assembly 21 and the electrode assembly 24, and meets the requirement of mutual connection between the power lead-out piece 243 and the electrode terminal 212; at the same time, the first through hole 232 opened on the receiving component 23 is relatively small, allowing only part of the power lead-out piece 243 to be exposed and connected to the electrode terminal 212, thereby improving the sealing and isolation effectiveness of the receiving component, minimizing the risk of electrolyte leakage from the receiving component, and further improving the performance reliability of the battery 100.

[0123] It is understandable that the power lead-out member 243 may be fitted with the inner wall of the receiving component 23 provided with the first through hole 232 or other auxiliary structures may be used to block the first through hole 232. The power lead-out member 243 may also be spaced apart from the inner wall of the receiving component 23 provided with the first through hole 232. When the power lead-out member 243 is spaced apart from the inner wall of the receiving component 23 provided with the first through hole 232, a sealing member may be provided on the inner wall of the receiving component 23 or on the side of the power lead-out member 243 facing the inner wall of the receiving component 23 to isolate the interior of the receiving component 23 from the first through hole 232. Alternatively, a sealing member may be provided between the electrode terminal 212 and the first through hole 232 to isolate the interior of the receiving component 23 from the first through hole 232, thereby improving the packaging effect of the receiving component 23 on the electrolyte and reducing or even eliminating the risk of electrolyte leakage through the first through hole 232.

[0124] In some embodiments, the power lead-out member 243 blocks the first through hole 232 .

[0125] In other words, the power lead-out member 243 directly blocks the first through hole 232 to reduce or even eliminate the risk of electrolyte leakage through the first through hole 232 .

[0126] There are various implementations of the power lead-out member 243 blocking the first through hole 232. For example, the power lead-out member 243 may include a surface that can completely cover the first through hole 232, and the surface is in contact with the inner wall of the receiving component 23 (the inner wall of the first wall 231 described below) where the first through hole 232 is provided. The first through hole 232 is blocked by the surface of the power lead-out member 243, or a sealing member (such as a sealing ring) is provided on the surface of the power lead-out member 243 at the periphery of the first through hole 232, and the sealing member is stuck between the power lead-out member 243 and the receiving component 23 to block the through hole between the interior of the receiving component 23 and the first through hole 232. In addition, a protrusion that can interference fit with the first through hole 232 can also be provided on the first exposed area 2431 of the surface, and the protrusion is used to block the first through hole 232, thereby blocking the passage between the first through hole 232 and the interior of the receiving component 23.

[0127] The power lead-out member 243 directly blocks the first through hole 232 to further reduce the risk of electrolyte leaking out of the receiving component 23 from the gap between the power lead-out member 243 and the first through hole 232, thereby improving the packaging effect of the receiving component 23 on the electrolyte, thereby further improving the reliability of the battery 100.

[0128] In yet other embodiments, referring to FIG. 3 and further to FIG. 6 and FIG. 7 , FIG. 6 is a partial cross-sectional view of portion A shown in FIG. 3 in yet other embodiments, and FIG. 7 is a cross-sectional view taken along the CC axis of portion A shown in FIG. The first exposed area 2431 has a protrusion 2432 , which passes through the first through-hole 232 and is connected to the electrode terminal 212 .

[0129] It is understandable that the protrusion 2432 can extend out of the outer surface of the receiving part 23, or be flush with the outer surface of the receiving part 23, or be slightly lower than the outer surface of the receiving part 23. For example, the protrusion 2432 can protrude from the outer surface of the receiving part 23.

[0130] There may be a gap between the protrusion 2432 and the inner wall of the first through hole 232 , or as described above, the protrusion 2432 and the first through hole 232 may be interference fit to reduce the risk of electrolyte leakage through the gap between the protrusion 2432 and the first through hole 232 .

[0131] Accordingly, the shape of the protrusion 2432 can be implemented in various forms, and its cross-sectional shape can be the same as or different from that of the first through hole 232. The protrusion 2432 can be a columnar structure with a uniform cross-section, or a shaped structure with a randomly varying cross-section, and this embodiment of the application does not limit this to a unique structure.

[0132] For example, as shown in FIG6 , the first through hole 232 is rectangular in shape, and the protrusion 2432 is cylindrical in shape.

[0133] The electrode terminal 212 can be connected to any position of the protrusion 2432. For example, along a direction perpendicular to the plane where the opening 221 of the first through hole 232 is located, the end of the protrusion 2432 away from the power lead-out piece 243 can have a connecting surface 24321, and the electrode terminal 212 can be welded to the connecting surface 24321.

[0134] A protrusion 2432 passing through the first through hole 232 is formed at the position of the first exposed area 2431. The protrusion 2432 can limit the relative position of the receiving component 23 and the power lead-out component 243 when the battery cell 20 is assembled, thereby facilitating grouping; and the protrusion 2432 extends out of the receiving component 23 through the first through hole 232 of the receiving component 23, thereby facilitating the connection between the electrode terminal 212 and the power lead-out component 243; in addition, the protrusion 2432 penetrates into the first through hole 232, thereby playing a role in sealing the first through hole 232 or reducing the gap between the power lead-out component 243 and the first through hole 232 to a certain extent, thereby further reducing the risk of electrolyte leakage through the first through hole 232 and improving the reliability of the battery 100.

[0135] As described above, there are various implementation structures of the power lead 243. In some embodiments, the electrode assembly 24 includes a main body 241 and a tab 242. The tab 242 protrudes from the main body 241 and forms the power lead 243.

[0136] Specifically, the main body 241 of the electrode assembly 24 may include a positive electrode sheet, a negative electrode sheet, and a separator. The main body 241 may be a wound structure formed by winding the positive electrode sheet, the separator, and the negative electrode sheet, or a stacked structure formed by stacking the positive electrode sheet, the separator, and the negative electrode sheet.

[0137] The tab 242 extends from the main body 241 and protrudes from the main body 241. The tab 242 can be integrally formed with the main body 241. For example, as mentioned above, the portion of the electrode collector that is not coated with the active material layer can directly form the tab 242. The electrode assembly 24 can include a positive electrode tab and a negative electrode tab, that is, the positive electrode collector that is not coated with the positive electrode active material layer forms the positive electrode tab, and the negative electrode collector that is not coated with the negative electrode active material layer forms the negative electrode tab.

[0138] Of course, in some other embodiments, the tabs 242 and the main body 241 may be provided separately and connected to each other by welding or other connection methods. For example, the tabs 242 and the main body 241 are integrally formed, and the tabs 242 directly form the power lead 243 of the electrode assembly 24 to connect to the electrode terminals 212 of the battery cells 20.

[0139] It can be understood that the positive electrode tab of the electrode assembly 24 is connected to the positive terminal 2121 , and the negative electrode tab is connected to the negative terminal 2122 .

[0140] The tab 242 of the electrode assembly 24 can directly extend to the position of the first through hole 232 of the receiving component, so that the tab 242 covers the first through hole 232 and has a first exposed area 2431 exposed through the first through hole 232. The first exposed area 2431 of the tab 242 is directly connected to the electrode terminal 212.

[0141] In some embodiments, as shown in FIG3 , the electrode assembly 24 further includes a main body 241 and a tab 242 . The tab 242 protrudes from the main body 241 , and an electric energy lead 243 is connected to the tab 242 to achieve electrical connection between the tab 242 and the electrode terminal 212 .

[0142] That is, the power lead-out member 243 is a component that is different from the tab 242 and is used for current flow and connection. The power lead-out member 243 connects the tab 242 and the electrode terminal 212. In practical applications, the power lead-out member 243 is also called a switching member, a current collecting member, etc.

[0143] In this embodiment, the power lead-out member 243 can be a sheet-like structure, a folded structure, etc. The power lead-out member 243 can include a pole tab connection area and an electrode terminal connection area. The pole tab 242 can be connected to the pole tab connection area by welding, conductive bonding, etc. The position of the electrode terminal connection area corresponding to the first through hole 232 forms a first exposed area 2431 to connect to the electrode terminal 212.

[0144] It is understandable that, based on the embodiment in which the electrode assembly 24 includes a positive electrode tab and a negative electrode tab, two power lead-out pieces 243 may also be provided, wherein one power lead-out piece 243 is connected to the positive electrode tab and the other power lead-out piece 243 is connected to the negative electrode tab.

[0145] In some embodiments, the power lead-out member 243 is fixedly connected to the receiving component 23 .

[0146] Specifically, the power lead-out member 243 can be fixedly connected to the receiving component 23 by bonding, welding, or clamping, so that the position of the power lead-out member 243 relative to the receiving component 23 is relatively fixed. For example, the power lead-out member 243 can be bonded to the inner wall of the receiving component 23 where the first through hole 232 is provided, or a clamping portion can be provided on other wall portions of the receiving component 23, and the power lead-out member 243 is clamped into the receiving component 23 via the clamping portion.

[0147] It is understandable that the power lead-out member 243 can be connected to any position of the receiving component 23 in any conventional connection manner, as long as the relative positions of the power lead-out member 243 and the receiving component 23 are fixed.

[0148] The power lead-out member 243 is fixedly connected to the receiving component 23, and the relative positions of the power lead-out member 243 and the receiving component 23 are fixed, thereby reducing the risk of displacement of the receiving component 23 or the power lead-out member 243, improving the fixity of the relative position of the first exposed area 2431, thereby improving the stability of the connection between the power lead-out member 243 and the electrode terminal 212, and also helping to improve the performance reliability of the battery 100.

[0149] In some embodiments, referring to FIG. 6 and FIG. 7 , the power lead-out member 243 and the receiving component 23 are connected to form a connection area 25 . The connection area 25 is an annular structure surrounding the outer periphery of the first through hole 232 .

[0150] Specifically, the power lead-out member 243 and the receiving component 23 can be connected by bonding, welding, etc. to form a mutually connected connection area 25. The connection area 25 is located at the periphery of the first through hole 232 and forms an annular structure.

[0151] Exemplarily, the power lead 243 and the receiving component 23 can be bonded together by an adhesive layer. The adhesive layer can be a colloid (such as hot melt adhesive, etc.) or a structure similar to a double-sided tape, with one surface of the double-sided tape bonded to the receiving component 23 and the other surface of the double-sided tape bonded to the power lead 243, thereby achieving bonding between the power lead 243 and the receiving component 23. The area where the receiving component 23 and the power lead 243 are bonded to each other forms a connection area 25. The power lead 243 and the receiving component 23 are bonded together by the adhesive layer, which is a simple process with few material restrictions, facilitating the assembly of the battery cell 20.

[0152] As shown in FIG6 , the receiving component 23 includes a first wall 231 provided with a first through hole 232 . The inner surface of the first wall 231 and the power lead-out member 243 are bonded to form an annular connecting area 25 , which is formed in a ring around the first through hole 232 .

[0153] It is understandable that the connection area 25 may extend along a direction pointing to the center of the first through hole 232 to the edge of the first through hole 232 , and the connection area 25 may also be spaced apart from the first through hole 232 .

[0154] The connection area 25 between the power lead-out member 243 and the receiving component 23 forms an annular structure, which is located on the periphery of the first through hole 232. The connection area 25 not only fixes the relative positions of the power lead-out member 243 and the receiving component 23, but also seals the power lead-out member 243 and the receiving component 23. The connection area 25 can prevent the electrolyte from entering the first through hole 232 through the gap between the power lead-out member 243 and the receiving component 23 and leaking out of the receiving component 23 from the first through hole 232, thereby further improving the sealing of the receiving component 23, which is conducive to further improving the performance reliability of the battery 100.

[0155] In some embodiments, please refer to Figure 3 again. The end cover assembly 21 includes an end cover 211 and an electrode terminal 212. The end cover 211 closes the opening 221, and the electrode terminal 212 is arranged on the end cover 211; the receiving component 23 includes a first wall 231. Along the thickness direction of the end cover 211, the first wall 231 is located between the end cover 211 and the electrode assembly 24, and the first through hole 232 is arranged on the first wall 231.

[0156] Exemplarily, two electrode terminals 212 are provided, and both electrode terminals 212 are mounted on the end cap 211. The two electrode terminals 212 are used to input or output the positive and negative electrodes of the battery cell 20, respectively. Specifically, two lead-out holes can be provided on the end cap 211, and the lead-out holes are arranged one-to-one with the electrode terminals 212. The lead-out holes penetrate the end cap 211 along the thickness direction of the end cap 211 (the Z direction in Figure 3). The electrode terminals 212 are inserted into the lead-out holes and mounted on the end cap 211 to enable the input or output of electrical energy from the battery cell 20 through the electrode terminals 212. The electrode terminals 212 are mounted on the end cap 211 in an insulated manner, that is, the electrode terminals 212 and the end cap 211 are not electrically connected.

[0157] Along the thickness direction of the end cover 211 (Z direction shown in FIG. 3 ), the receiving member 23 includes a first wall 231 facing the end cover 211 . The first wall 231 is located between the end cover 211 and the main body 241 of the electrode assembly 24 .

[0158] The first through hole 232 is provided on the first wall 231 , that is, the first through hole 232 is provided on the wall portion of the receiving component 23 facing the end cover 211 .

[0159] It is understood that, along the thickness direction of the end cap 211, the electrode terminal 212 can be disposed correspondingly to the first through hole 232, or can be disposed offset from the first through hole 232. For example, along the thickness direction of the end cap 211, the electrode terminal 212 can be disposed correspondingly to the first through hole 232 to shorten the connection path of the electrode terminal 212.

[0160] The first through hole 232 of the receiving component 23 is located on the first wall 231 of the receiving component 23 facing the end cover 211, which can minimize the connection distance between the electrode terminal 212 and the power lead-out piece 243, facilitate the assembly operation of the battery cell 20, and save the internal space of the shell 22, which is beneficial to improving the energy density of the battery cell 20.

[0161] In some embodiments, please continue to refer to Figure 3, the end cap assembly 21 includes two electrode terminals 212, two power lead-out pieces 243 and two first through holes 232 are provided, and both the power lead-out pieces 243 and the first through holes 232 correspond to the electrode terminals 212 one by one.

[0162] As previously mentioned, the battery cell 20 may include two electrode terminals 212, namely a positive electrode terminal 2121 and a negative electrode terminal 2122. Accordingly, two power lead-out members 243 may also be provided, namely a positive electrode power lead-out member and a negative electrode power lead-out member. Two first through-holes 232 are provided on the receiving component 23. The positive electrode power lead-out member includes a positive electrode first exposed area exposed from one of the first through-holes 232, and the negative electrode power lead-out member includes a negative electrode first exposed area exposed from the other first through-hole 232. The positive electrode terminal 2121 is connected to the positive electrode first exposed area, and the negative electrode terminal 2122 is connected to the negative electrode first exposed area.

[0163] It can be understood that based on the implementation form of "the electrode assembly 24 includes a main body 241 and a tab 242, and the tab 242 forms an electric energy lead-out piece 243", the tab 242 includes a positive tab and a negative tab, the positive tab has a positive first exposed area and is connected to the positive terminal 2121, and the negative tab has a negative first exposed area and is connected to the negative terminal 2122.

[0164] Based on the implementation form of "the electrode assembly 24 also includes a main body 241 and a tab 242, and the power lead-out piece 243 connects the tab 242 and the electrode terminal 212", the positive pole power lead-out piece is connected to the positive pole tab and the positive pole power lead-out piece includes a positive pole first exposed area exposed from one of the first through holes 232, and the negative pole power lead-out piece 243 is connected to the negative pole tab and includes a negative pole first exposed area exposed from the other first through hole 232.

[0165] Two first through holes 232 are provided on the receiving component 23. The two first through holes 232 correspond one-to-one to the two power lead-out parts 243 of the battery cell 20, which can prevent the problem of one first through hole 232 being compatible with the connection of two power lead-out parts 243 due to the need to reserve avoidance space, thereby reducing the risk of the first through hole 232 being too large and affecting the packaging effect of the receiving component 23 on the electrolyte, thereby reducing the risk of electrolyte leakage and improving the performance reliability of the battery 100.

[0166] In other embodiments, please refer to FIG3 and further to FIG8 and FIG9. FIG8 is a partial cross-sectional view of portion A shown in FIG3 in other embodiments, and FIG9 is a cross-sectional view of portion A shown in FIG8 taken along the DD direction. The end cap assembly 21 includes an electrode terminal 212, and the electrode assembly 24 includes a main body 241 and an electric energy lead-out member 243. The main body 241 is located within the receiving component, and the electric energy lead-out member 243 is located outside the receiving component 23 and connected to the electrode terminal 212. The receiving component 23 is provided with a first through hole 232, and the electric energy lead-out member 243 covers the first through hole 232. The area of ​​the electric energy lead-out member 243 corresponding to the first through hole 232 forms a second exposed area 2434. The second exposed area 2434 is connected to the main body 241 to achieve electrical connection between the main body 241 and the electrode terminal 212.

[0167] That is, the power lead-out member 243 can be disposed inside or outside the receiving component 23. Specifically, the power lead-out member 243 disposed outside the receiving component 23 can include an electrode terminal connection region and a main body connection region. The electrode terminal connection region is connected to the electrode terminal 212, and the main body connection region can cover the first through-hole 232. When viewed from the inside of the receiving component 23, the area of ​​the main body connection region corresponding to the first through-hole 232 forms a second exposed region 2434. The second exposed region 2434 can be directly or indirectly connected to the main body 241.

[0168] It is understood that the electrode assembly 24 may further include a tab 242 that protrudes from the main body 241 and connects the main body 241 and the power lead 243. Specifically, the end of the tab 242 may extend from the first through-hole 232 and connect to the second exposed area 2434. Of course, the second exposed area 2434 may also have a protrusion that extends into the first through-hole 232, and the protrusion can be connected to the tab 242.

[0169] Similar to the power lead-out member 243 disposed inside the receiving component 23 , the power lead-out member 243 disposed outside the receiving component can also be fixedly connected to the receiving component 23 by bonding or other methods.

[0170] The power lead-out piece 243 can be set outside the receiving component 23, and the main body of the electrode assembly 24 and the power lead-out piece 243 can be directly or indirectly connected to each other through the first through hole 232. The power lead-out piece 243 is located outside the receiving component 23 to facilitate the connection operation between the power lead-out piece 243 and the electrode terminal 212.

[0171] In some embodiments, referring to FIG. 3 , the end cap assembly 21 is provided with a liquid injection hole 26 , and the liquid injection hole 26 is communicated with the interior of the receiving component 23 .

[0172] The injection hole 26 communicates with the interior of the receiving component 23 , so that electrolyte can be injected from the outside of the battery cell 20 into the interior of the receiving component 23 through the injection hole 26 .

[0173] Based on the difference of the end cap assembly 21 , the injection hole 26 can be set at any position of the end cap assembly 21 , as long as it can connect the interior of the receiving component 23 with the external environment of the battery cell 20 and can realize the function of injecting liquid into the interior of the receiving component 23 .

[0174] In some embodiments, please refer to FIG3 and further to FIG10 and FIG11. FIG10 is a top view of an end cap assembly provided in some embodiments of the present application, and FIG11 is a cross-sectional view taken along the EE direction shown in FIG10. The end cap assembly 21 includes an end cap 211 and an electrode terminal 212. The end cap 211 closes the opening 221. The electrode terminal 212 is disposed on the end cap 211 and is electrically connected to the electrode assembly 24. The liquid injection hole 26 is disposed on the electrode terminal 212.

[0175] As mentioned above, a lead-out hole can be set on the end cover 211, and the lead-out hole is set one-to-one corresponding to the electrode terminal 212. The lead-out hole passes through the end cover 211 along the thickness direction of the end cover 211 (Z direction in Figure 11), and the electrode terminal 212 is passed through the lead-out hole and installed on the end cover 211 to realize the input or output of electrical energy of the battery cell 20 through the electrode terminal 212.

[0176] The injection hole 26 is arranged on the electrode terminal 212, that is, the injection hole 26 can pass through any surface of the electrode terminal 212 located on the outside of the end cover 211 and any surface located on the inside of the end cover 211 to connect the inside and outside of the battery cell 20. At the same time, one end of the injection hole 26 located on the inside of the end cover 211 is connected to the inside of the receiving component 23, so that the injection hole 26 connects the outside of the battery cell 20 and the inside of the receiving component 23.

[0177] Illustratively, the injection hole 26 penetrates both ends of the electrode terminal 212 along the thickness direction (Z direction shown in FIG. 11 ) of the end cap 211 .

[0178] It should be noted that an insulating layer may be provided on the peripheral wall of the liquid injection hole 26 to form an insulating barrier between the electrode terminal 212 and the electrolyte, thereby playing the role of insulating and isolating the electrode terminal 212 and the electrolyte.

[0179] The injection hole 26 is integrated into the electrode terminal 212, which can reduce the number of openings in the end cover 211 itself. At the same time, the electrode terminal 212 is connected to the electrode assembly 24, and the electrolyte in the injection hole 26 can enter the receiving component 23 through the connection between the electrode terminal 212 and the electrolytic assembly. Compared with the structure of opening a separate hole on the receiving component 23 to connect the injection hole 26 with the receiving component 23, the destructive processing of the receiving component 23 can be reduced, the isolation effect of the receiving component 23 can be improved, and the reliability of the battery 100 can be improved.

[0180] Of course, in other cases, the injection hole 26 may also be provided on the end cap 211 and pass through the inner surface of the end cap 211 (the surface facing the electrode assembly 24) and the outer surface of the end cap 211 (the surface facing away from the electrode assembly 24). At the same time, a hole may be opened in the receiving component 23 at a position corresponding to the injection hole 26, and the injection hole 26 is connected to the opening of the receiving component 23, so that the injection hole 26 can communicate with the interior of the receiving component 23. It is understood that a pipe may be provided on the end cap 211 or the receiving component 23, and the injection hole 26 and the opening are connected through the pipe to reduce the possibility of electrolyte being injected into the outside of the receiving component 23 during the injection process.

[0181] In some embodiments, please refer again to Figures 3 to 11 and further to Figure 12, which is a partial cross-sectional schematic diagram of the connection relationship between the end cap assembly and the receiving component provided in some embodiments of the present application. The receiving component 23 is provided with a first through hole 232, and the electrode assembly 24 includes an electric energy lead 243, which is located within the receiving component 23. The area corresponding to the electric energy lead 243 and the first through hole 232 forms a first exposed area 2431, and the first exposed area 2431 is connected to the electrode terminal 212; the first exposed area 2431 is provided with a second through hole 2433, and the second through hole 2433 connects the injection hole 26 and the interior of the receiving component 23.

[0182] Specifically, the injection hole 26 is arranged on the electrode terminal 212. At the same time, a second through hole 2433 is arranged on the first exposed area 2431. The second through hole 2433 is connected to the interior of the receiving component 23. After the electrode terminal 212 is connected to the first exposed area 2431 of the power lead-out component 243, the injection hole 26 in the electrode terminal 212 and the second through hole 2433 can be connected, so that the injection hole 26 can be connected to the interior of the receiving component 23 through the second through hole 2433.

[0183] It should be noted that, based on the embodiment of “the first exposed area 2431 has a protrusion 2432 , the protrusion 2432 passes through the first through hole 232 and is connected to the electrode terminal 212 ”, the injection hole 26 may pass through the protrusion 2432 .

[0184] It is understandable that the injection hole 26 and the second through hole 2433 can be directly connected, or can be indirectly connected through other intermediate connecting structures.

[0185] The power lead-out member 243 has a first exposed area 2431 exposed from the first through hole 232 of the receiving component 23, and the electrode terminal 212 is connected to the first exposed area 2431. At the same time, a second through hole 2433 is provided on the first exposed area 2431. The injection hole 26 in the electrode terminal 212 is connected to the second through hole 2433, so that the injection hole 26 is connected to the interior of the receiving component 23. Its structural integration is strong. The receiving component 23 has a through hole to meet the two requirements of connecting the electrode assembly 24 and the electrode terminal 212 to each other and connecting the injection hole 26 to the interior of the receiving component 23. While meeting the various functional requirements of the battery cell 20, it minimizes destructive processing of the receiving component 23, improves the integrity and sealing of the receiving component 23, thereby reducing the risk of electrolyte leakage from the receiving component 23, and further reducing the leakage risk of the battery cell 20, thereby improving the reliability of the battery cell 20.

[0186] In some embodiments, along the thickness direction of the end cover 211 , the injection hole 26 and the second through hole 2433 are disposed opposite to each other.

[0187] Illustratively, along the thickness direction of the end cap 211 (the Z direction shown in FIG. 12 ), the electrode terminal 212 has an end surface 2123 that faces the first exposed area 2431 or even directly abuts the first exposed area 2431. One end of the liquid injection hole 26 passes through this end surface 2123. After the electrode terminal 212 is connected to the first exposed area 2431, the end of the liquid injection hole 26 that extends to the end surface 2123 and the second through hole 2433 can communicate with each other. When viewed along the thickness direction of the end cap 211, the liquid injection hole 26 and the second through hole 2433 can partially or completely overlap, so that the liquid injection hole 26 and the second through hole 2433 are directly connected.

[0188] It is understood that the electrode terminal 212 may be directly connected to the first exposed area 2431 at the end surface 2123, or may be connected to the first exposed area 2431 at another location of the electrode terminal 212 via an intermediate connector. For example, the end surface 2123 of the electrode terminal 212 is directly connected to the first exposed area 2431.

[0189] The injection hole 26 is directly connected to the second through hole 2433 , and the electrolyte flowing out of the injection hole 26 can directly enter the second through hole 2433 , which can shorten the injection path as much as possible and reduce the risk of leakage during the injection of electrolyte into the receiving component 23 , which is also beneficial to improving the reliability of the battery cell 20 .

[0190] In some embodiments, as shown in FIG. 12 , the electrode terminal 212 is welded to the first exposed area 2431 to form a welding area 27 . The welding area 27 is an annular structure disposed around the outer periphery of the liquid injection hole 26 .

[0191] Specifically, based on the implementation form of "along the thickness direction of the end cover 211, the electrode terminal 212 has an end face 2123 facing the first exposed area 2431 or even directly abutting the first exposed area 2431", the end face 2123 can be directly welded to the first exposed area 2431 to form a welding area 27 with an annular structure on the periphery of the injection hole 26.

[0192] Exemplarily, as shown in Figure 12, the first exposed area 2431 has a protrusion 2432, which passes through the first through hole 232. Along the direction perpendicular to the plane where the opening 221 of the first through hole 232 is located, the end of the protrusion 2432 facing away from the power lead-out piece 243 has a connecting surface 24321, and the end face 2123 of the electrode terminal 212 is welded to the connecting surface 24321 to form a welding area 27.

[0193] Of course, the outer peripheral surface of the electrode terminal 212 intersecting the end surface 2123 and the first exposed area 2431 may also be welded, and a ring-shaped welding area can also be formed around the injection hole 26 .

[0194] It is understandable that, along a direction perpendicular to the axial direction of the liquid injection hole 26 (Z direction in FIG. 12 ), the welding area 27 may extend to the edge of the liquid injection hole 26 , or may be spaced apart from the edge of the liquid injection hole 26 .

[0195] The electrode terminal 212 is welded to the first exposed area 2431 to form a welding area 27, which can improve the connection stability between the electrode terminal 212 and the power lead-out piece 243; the welding area 27 forms an annular structure on the periphery of the injection hole 26, which can seal the connection between the injection hole 26 and the second through hole 2433, further reducing the risk of leakage during the injection of electrolyte into the receiving component 23, and improving the reliability of the battery cell 20.

[0196] In some embodiments, the end cap assembly 21 includes two electrode terminals 212 , wherein one electrode terminal 212 is a positive terminal 2121 , and the other electrode terminal 212 is a negative terminal 2122 . The injection hole 26 is provided at the positive terminal 2121 .

[0197] The negative charge of the shell 22 may cause the shell 22 to corrode and leak. The liquid injection hole 26 is set at the positive terminal 2121, which can reduce the insulation protection requirements between the liquid injection hole 26 and the electrode terminal 212. Even if the electrolyte conducts the positive terminal 2121 and the shell 22, the shell 22 will be positively charged, thereby reducing the risk of corrosion of the shell 22 and leakage, and improving the reliability of the battery 100.

[0198] In some embodiments, the end cap assembly 21 includes two electrode terminals 212 , and the injection holes 26 correspond one-to-one to the electrode terminals 212 .

[0199] That is, two injection holes 26 are also provided, one on each electrode terminal 212. It is understood that each injection hole 26 is connected to the interior of the receiving component 23. The provision of injection holes 26 on both electrode terminals 212 can improve the efficiency of injecting liquid into the battery cell 20.

[0200] In yet other embodiments, please refer to FIG. 13 , which is an exploded view of a battery cell provided in yet other embodiments of the present application. The end cap assembly 21 includes an end cap 211 and an electrode terminal 212 . The end cap 211 closes the opening 221 . The electrode terminal 212 is disposed on the end cap 211 and electrically connected to the electrode assembly 24 . The end cap 211 is configured to support the electrode assembly 24 along its thickness.

[0201] Along the thickness direction of the end cover 211 (the Z direction shown in Figure 13), the end cover 211 is configured to support the electrode assembly 24, that is, the battery cell 20 can be placed upside down in the box body 10, and the end of the battery cell 20 where the electrode terminal 212 is provided (the end where the end cover 211 is located) is set toward the bottom of the box body 10, or in actual application, the end of the battery cell 20 where the electrode terminal 212 is provided (the end where the end cover 211 is located) is set toward the ground or downward, so that the thickness direction of the end cover 211 is the direction of gravity.

[0202] The end cap 211 supports the electrode assembly 24, that is, the end cap assembly 21 of the battery cell 20 can be set downward, and the receiving component 23 can reduce the risk of electrolyte leakage through the connection between the end cap assembly 21 and the shell 22, the connection between the end cap 211 and the electrode terminal 212, and the connection between the explosion-proof valve that may be set on the end cap 211 and the end cap 211, thereby improving the performance reliability of the battery 100.

[0203] Some embodiments of the present application further provide a battery 100 comprising the battery cell 20 as described in any of the above embodiments.

[0204] Some embodiments of the present application further provide an electrical device, which may include the battery cell 20 described in any of the above embodiments, and the battery cell 20 is used to provide electrical energy; or the electrical device may include the battery 100 described in the above embodiments, and the battery 100 is used to provide electrical energy. The electrical device may be any of the aforementioned devices or systems using the battery 100.

[0205] Referring to Figures 3 to 12, some embodiments of the present application provide a battery cell 20, which includes a housing 22, an end cap assembly 21, an electrode assembly 24, and a receiving component 23. The housing 22 has an opening 221, and the end cap assembly 21 includes an end cap 211 and an electrode terminal 212 disposed on the end cap 211. The end cap 211 closes the opening 221. The electrode assembly 24 is housed within the housing 22, and the receiving component 23 is also housed within the housing 22. The receiving component 23 is used to accommodate the electrode assembly 24 and the electrolyte.

[0206] The receiving component 23 includes a first wall 231 . Along the thickness direction of the end cover 211 , the first wall 231 is located between the end cover 211 and the electrode assembly 24 . A first through hole 232 is provided on the first wall 231 .

[0207] The electrode assembly 24 includes a main body 241, a tab 242, and an electrical energy lead 243. The tab 242 protrudes from the main body 241, and the electrical energy lead 243 is connected to the tab 242. The main body 241, tab 242, and electrical energy lead 243 are all located within the receiving component 23. The area of ​​the electrical energy lead 243 corresponding to the first through-hole 232 forms a first exposed area 2431. The first exposed area 2431 has a protrusion 2432, which passes through the first through-hole 232 and connects to the electrode terminal 212. The electrical energy lead 243 and the receiving component 23 are connected to form a connection area 25, which is an annular structure arranged around the outer periphery of the first through-hole 232.

[0208] The end cap assembly 21 is further provided with a liquid injection hole 26, which is disposed in the electrode terminal 212. The first exposed area 2431 is provided with a second through-hole 2433, which connects the liquid injection hole 26 with the interior of the receiving component 23. Along the thickness direction of the end cap 211, the liquid injection hole 26 and the second through-hole 2433 are disposed opposite each other.

[0209] Some embodiments of the present application further provide a method for preparing a battery cell 20. Please refer to FIG. 14 , which is a flow chart of a method for preparing a battery cell according to some embodiments of the present application. The method mainly includes the following steps:

[0210] S1: Provide a shell 22, an end cover assembly 21, an electrode assembly 24 and a receiving component 23.

[0211] Among them, the shell 22 can be any of the aforementioned shells 22 for accommodating the electrode assembly 24 and the receiving component 23, the end cover assembly 21 can be any of the aforementioned end cover assemblies 21, the electrode assembly 24 can be any of the aforementioned electrode assemblies 24, and the receiving component 23 can be any of the aforementioned receiving components 23.

[0212] The shell 22, end cover assembly 21, electrode assembly 24 and receiving component 23 can all be provided by manual operation, or they can all be provided by automated equipment, feeding equipment and other devices, or they can be provided by a combination of man and machine (part of the shell 22, end cover assembly 21, electrode assembly 24 and receiving component 23 is provided manually, and the other part is fed by equipment).

[0213] S2: The electrode assembly 24 is accommodated in the receiving component 23 .

[0214] The electrode assembly 24 can be placed in the receiving component 23 in a manual operation mode or an automatic equipment operation mode.

[0215] Optionally, the electrode assembly 24 may be fixed to the receiving component 23 so that the relative positions of the receiving component 23 and the electrode assembly 24 are fixed.

[0216] S3: The electrode assembly 24 and the receiving component 23 are housed in the housing 22 .

[0217] Specifically, the housing member 23 containing the electrode assembly 24 is placed in the housing 22 .

[0218] S4: Use the end cover assembly 21 to close the opening 221 of the housing 22 .

[0219] The end cap assembly 21 closes the opening 221 of the shell 22 , and the end cap assembly 21 and the shell 22 together form a closed accommodating space 222 for accommodating the electrode assembly 24 and the receiving component 23 .

[0220] S5 : Electrolyte is injected into the housing member 23 .

[0221] Specifically, the electrolyte can be injected through the injection hole 26 provided on the housing 22 or the end cap assembly 21 of the battery cell 20 or into the receiving component 23 in the housing 22, so that the electrolyte is also contained in the receiving component 23 and infiltrates the electrode assembly 24 contained in the receiving component 23. Of course, the receiving component 23 can also reserve a passage that can be connected to the outside of the housing 22 or the end cap assembly 21 (for example, the receiving component 23 is connected to a pipe extending to the outside of the battery cell 20), and the electrolyte is injected into the receiving component 23 through this passage.

[0222] The receiving component 23 and the shell 22 perform a double packaging function for the electrolyte, thereby reducing the risk of electrolyte leakage and improving the reliability of the battery cell 20 .

[0223] In some embodiments, accommodating the electrode assembly 24 in the receiving component 23 mainly includes: installing the electrode assembly 24 into the receiving component 23 through the entrance of the receiving component 23; and sealing the entrance.

[0224] That is, the receiving component 23 may have a reserved entrance (not shown in the figure) through which the electrode assembly 24 can be loaded into the receiving component 23 during assembly of the battery cell 20. After the electrode assembly 24 is loaded into the receiving component 23, the reserved entrance of the receiving component 23 is sealed to prevent the electrolyte injected into the receiving component 23 from leaking out through the entrance.

[0225] It should be noted that the entrance of the receiving part 23 can be reserved at any position that does not hinder the grouping of the receiving part 23 and the subsequent connection between the electrode assembly 24 and the electrode terminal 212. For example, based on the aforementioned implementation form of "the receiving part 23 includes a first wall 231, and the first wall 231 is provided with a first through hole 232", the entrance can be arranged opposite to the first through hole 232.

[0226] The inlet can be sealed by any conventional sealing method such as welding sealing, adhesive sealing, etc.

[0227] The receiving component 23 is provided with an entrance, which facilitates the installation of the electrode assembly 24 into the receiving component 23 through the entrance of the receiving component 23. After the electrode assembly 24 is installed into the receiving component 23, the entrance of the receiving component 23 is sealed, which can improve the structural sealing of the receiving component 23, thereby improving the packaging effect of the receiving component 23 on the electrolyte, reducing the risk of leakage of the receiving component 23, and thereby improving the reliability of the battery 100.

[0228] 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.

[0229] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and components may be substituted with equivalents without departing from the scope of the present application. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.

Claims

1. A battery cell, comprising: a housing having an opening; an end cap assembly, closing the opening; an electrode assembly, contained in the housing; The receiving component is received in the shell and is used to receive the electrode assembly and the electrolyte.

2. The battery cell according to claim 1, wherein: The end cap assembly includes an electrode terminal, the receiving component is provided with a first through hole, the electrode assembly includes an electric energy lead-out member, the electric energy lead-out member is located in the receiving component, the area of ​​the electric energy lead-out member corresponding to the first through hole forms a first exposed area, and the first exposed area is connected to the electrode terminal.

3. The battery cell according to claim 2, wherein: The electric energy lead-out member blocks the first through hole.

4. The battery cell according to claim 2 or 3, wherein: The first exposed area has a protrusion, and the protrusion passes through the first through hole and is connected to the electrode terminal.

5. The battery cell according to any one of claims 2 to 4, wherein: The electrode assembly includes a main body and a pole ear, wherein the pole ear protrudes from the main body and forms the electric energy lead-out member.

6. The battery cell according to any one of claims 2 to 4, wherein: The electrode assembly further includes a main body and a pole ear, wherein the pole ear protrudes from the main body, and the power lead-out member is connected to the pole ear to achieve electrical connection between the pole ear and the electrode terminal.

7. The battery cell according to any one of claims 2 to 6, wherein: The electric energy lead-out component is fixedly connected to the receiving component.

8. The battery cell according to claim 7, wherein: The electric energy lead-out component and the receiving component are connected to form a connection area, and the connection area is an annular structure arranged around the outer periphery of the first through hole.

9. The battery cell according to claim 7 or 8, wherein: The electric energy lead-out component and the receiving component are bonded together by an adhesive layer.

10. The battery cell according to any one of claims 2 to 9, wherein: The end cap assembly comprises an end cap and the electrode terminal, the end cap closes the opening, and the electrode terminal is arranged on the end cap; The receiving component includes a first wall. Along the thickness direction of the end cover, the first wall is located between the end cover and the electrode assembly. The first through hole is arranged in the first wall.

11. The battery cell according to any one of claims 2 to 10, wherein: The end cap assembly includes two electrode terminals, and two of the power lead-out members and the first through holes are provided, and the power lead-out members and the first through holes correspond to the electrode terminals one by one.

12. The battery cell according to claim 1, wherein: The end cap assembly includes an electrode terminal, and the electrode assembly includes a main body and an electric energy lead-out member, wherein the main body is located inside the receiving member, and the electric energy lead-out member is located outside the receiving member and connected to the electrode terminal; The receiving component is provided with a first through hole, the power lead-out piece covers the first through hole, the area of ​​the power lead-out piece corresponding to the first through hole forms a second exposed area, and the second exposed area is connected to the main body to achieve electrical connection between the main body and the electrode terminal.

13. The battery cell according to any one of claims 1 to 12, wherein: The material of the receiving component is insulating material.

14. The battery cell according to any one of claims 1 to 13, wherein: The material of the receiving component includes at least one of polypropylene and polyethylene terephthalate.

15. The battery cell according to any one of claims 1 to 14, wherein: The end cover assembly is provided with a liquid injection hole, and the liquid injection hole is communicated with the interior of the receiving component.

16. The battery cell according to claim 15, wherein: The end cap assembly includes an end cap and an electrode terminal, the end cap closes the opening, the electrode terminal is disposed on the end cap, the electrode terminal is electrically connected to the electrode assembly, and the injection hole is disposed on the electrode terminal.

17. The battery cell according to claim 16, wherein: The receiving component is provided with a first through hole, the electrode assembly includes an electric energy lead-out member, the electric energy lead-out member is located in the receiving component, the area of ​​the electric energy lead-out member corresponding to the first through hole forms a first exposed area, and the first exposed area is connected to the electrode terminal; The first exposed area is provided with a second through hole, and the second through hole communicates with the injection hole and the interior of the receiving component.

18. The battery cell according to claim 17, wherein: Along the thickness direction of the end cover, the injection hole and the second through hole are arranged opposite to each other.

19. The battery cell according to claim 17 or 18, wherein: The electrode terminal and the first exposed area are welded to form a welding area, and the welding area is an annular structure surrounding the outer periphery of the injection hole.

20. The battery cell according to any one of claims 16 to 19, wherein: The end cap assembly includes two electrode terminals, one of which is a positive electrode terminal and the other is a negative electrode terminal, and the injection hole is arranged at the positive electrode terminal.

21. The battery cell according to any one of claims 16 to 19, wherein: The end cap assembly includes two electrode terminals, and the injection holes correspond to the electrode terminals one by one.

22. The battery cell according to any one of claims 1 to 21, wherein: The end cap assembly includes an end cap and an electrode terminal, wherein the end cap closes the opening, the electrode terminal is disposed on the end cap and is electrically connected to the electrode assembly, and along a thickness direction of the end cap, the end cap is configured to support the electrode assembly.

23. A battery comprising the battery cell according to any one of claims 1 to 22.

24. An electrical device, comprising the battery cell according to any one of claims 1 to 22, wherein the battery cell is used to provide electrical energy; or comprising the battery according to claim 23, wherein the battery is used to provide electrical energy.

25. A method for preparing a battery monomer, comprising: Providing a shell, an end cap assembly, an electrode assembly and a receiving component; accommodating the electrode assembly in the receiving component; Accommodating the electrode assembly and the receiving component in the housing; Using the end cap assembly to close the opening of the housing; An electrolyte is injected into the housing member.

26. The method for preparing a battery monomer according to claim 25, wherein: The step of accommodating the electrode assembly in the receiving component comprises: Installing the electrode assembly into the receiving component through the inlet of the receiving component; The inlet is sealed.

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