Battery cell, manufacturing method and manufacturing equipment thereof, battery and power-consuming device

Abstract

The present application provides a battery cell and its manufacturing method and manufacturing equipment, battery and electrical device, which belong to the field of battery technology. Among them, the battery cell includes a shell assembly, an electrode assembly and a current collecting component. The shell assembly includes an electrode lead-out portion for inputting or outputting electrical energy. The electrode assembly is accommodated in the shell assembly, and the electrode assembly includes a main body and a pole ear portion protruding from the main body. The current collecting component is used to connect the electrode lead-out portion and the pole ear portion so that the pole ear portion is electrically connected to the electrode lead-out portion. The pole ear portion includes a plurality of sub-pole ears, and the current collecting component has a plurality of avoidance areas, each avoidance area is used for allowing at least part of a sub-pole ear portion to pass through, so that the sub-pole ear portion can be connected to the side of the current collecting component away from the main body. The battery cell of this structure can improve the connection stability between the sub-pole ear portion and the current collecting component, and can improve the consistency of the connection of multiple sub-pole ears to the current collecting component, so as to reduce the risk of uneven current conduction and detachment of the sub-pole ear portion.

Description

Technical Field

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

[0002] Lithium-ion batteries have outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide adaptability, and low self-discharge coefficient. They are one of the most widely used batteries in the world today and an important part of the development of new energy. The battery cell of a lithium-ion battery is assembled into an electrode assembly (bare cell) by winding or stacking the positive electrode sheet, the negative electrode sheet and the diaphragm, which is then placed in a shell and injected with electrolyte. However, with the continuous development of lithium-ion battery technology, higher requirements are also placed on the quality and safety of lithium-ion batteries. However, the batteries in the prior art have great safety hazards in the later use process, which is not conducive to the safety of consumers. Summary of the Invention

[0003] The embodiments of the present application provide a battery cell and a manufacturing method and equipment thereof, a battery, and an electrical device, which can effectively reduce safety hazards of the battery during use.

[0004] In a first aspect, an embodiment of the present application provides a battery cell, comprising a shell assembly, an electrode assembly and a current collecting member; the shell assembly comprises an electrode lead-out portion for inputting or outputting electrical energy; the electrode assembly is accommodated in the shell assembly, and the electrode assembly comprises a main body portion and a pole ear portion protruding from the main body portion; the current collecting member is accommodated in the shell assembly, and the current collecting member is used to connect the electrode lead-out portion and the pole ear portion so that the pole ear portion is electrically connected to the electrode lead-out portion; wherein the pole ear portion comprises a plurality of sub-pole ear portions, and the current collecting member has a plurality of avoidance areas, each of the avoidance areas being used for allowing at least a portion of a sub-pole ear portion to pass through, so that the sub-pole ear portion can be connected to the side of the current collecting member facing away from the main body portion.

[0005] In the above technical solution, the electrode assembly is provided with a main body and a pole ear portion protruding from the main body, the pole ear portion includes a plurality of sub-pole ears, and the current collecting component has a plurality of avoidance areas. By passing each sub-pole ear portion through an avoidance area, and connecting the sub-pole ear portion to the side of the current collecting component away from the main body after passing through the current collecting component, the battery cell adopting this structure is beneficial to improving the connection stability between the sub-pole ear portion and the current collecting component, thereby reducing the risk of falling off between the sub-pole ear portion and the current collecting component during later use, so as to ensure the reliability of the battery cell and improve the service life of the battery cell; on the other hand, it is convenient to connect the sub-pole ear portion to the current collecting component during the production process, thereby improving the consistency of the connection of multiple sub-pole ears to the current collecting component, so as to reduce the phenomenon of uneven current conduction between the pole ear portion and the current collecting component, and thus can alleviate the phenomenon of temperature rise of the battery cell due to excessive local overcurrent, so as to reduce the safety hazards of the battery cell during later use, which is beneficial to ensure the safety of consumers. In addition, the electrode assembly of the battery cell using this structure does not need to adopt a structure with full-tab flattening, which can effectively alleviate the phenomenon of short circuit in the battery cell caused by powder particles generated during the flattening process of the tabs of the electrode assembly, and is conducive to improving the problems of poor shaping and insufficient conduction area of the tabs after flattening.

[0006] In some embodiments, the current collecting component includes a first connecting portion and multiple second connecting portions; the first connecting portion is used to connect to the electrode lead-out portion; multiple second connecting portions are arranged at intervals along the circumference of the current collecting component on the first connecting portion, the second connecting portion has at least one avoidance area, and the second connecting portion is used to connect to the sub-pole ear portion.

[0007] In the above technical solution, the current collecting component is provided with a first connecting portion and a plurality of second connecting portions. By arranging the plurality of second connecting portions on the first connecting portion along the circumference of the current collecting component, and each second connecting portion having at least one avoidance area, on the one hand, it is convenient to connect the first connecting portion with the electrode lead-out portion of the shell assembly, and on the other hand, it enables the current collecting component to be connected to the sub-pole ear portions in different circumferential areas of the pole ear portion, so as to ensure the connection stability between the current collecting component and the pole ear portion.

[0008] In some embodiments, the second connection portion has a plurality of the avoidance areas spaced apart along a radial direction of the current collecting member.

[0009] In the above technical solution, a plurality of avoidance areas arranged at intervals along the radial direction of the current collecting component are provided on the second connecting portion, so that a plurality of sub-pole ears in different radial areas of the current collecting component can pass through the corresponding avoidance areas and then be connected to the second connecting portion, thereby increasing the connection area between the pole ear of the electrode assembly and the current collecting component, and further facilitating the flow conduction area between the pole ear and the current collecting component, thereby reducing the risk of polarization of the pole ear of the electrode assembly due to insufficient flow conduction area.

[0010] In some embodiments, the second connecting portion includes a converging section and a plurality of guide sections; the converging section is connected to the first connecting portion, and the converging section extends radially along the current collecting component; the guide section is connected to the converging section, a plurality of the converging sections are arranged at intervals along the radial direction of the current collecting component, and the guide section extends circumferentially along the current collecting component; wherein, along the radial direction of the current collecting component, the second connecting portion forms the avoidance areas on both sides of the guide section, and the sub-pole ear portion is connected to the side of the guide section away from the main body portion.

[0011] In the above technical solution, the second connection portion is provided with a bus section and a plurality of guide sections, the bus section extends radially along the current collecting component and is connected to the first connection portion, by arranging the plurality of guide sections at intervals along the radial direction of the current collecting component, and the guide sections extend circumferentially along the current collecting component, that is, the plurality of guide sections are connected to the bus section at intervals along the extension direction of the bus section, and the guide sections are arc-shaped structures extending circumferentially along the current collecting component, thereby realizing the formation of avoidance areas for the sub-pole ears to pass through on both sides of the guide sections in the radial direction of the current collecting component, and the avoidance areas are extended circumferentially along the current collecting component, so as to facilitate the sub-pole ears to pass through the second connection portion of the current collecting component. This structure is simple and easy to implement.

[0012] In some embodiments, any one of the guide segments in one of the second connecting parts and any one of the guide segments in another of the second connecting parts are located on different circumferences.

[0013] In the above technical solution, the guide sections of each second connecting portion are arranged to be located on different circumferences, so that the guide sections of each second connecting portion can be connected to the sub-pole ear portions of the electrode assembly located on different circumferences in the radial direction of the current collecting component, thereby effectively improving the overall connection area between the current collecting component and the pole ear portion, and further improving the guide area between the current collecting component and the pole ear portion, so as to reduce the risk of polarization of the pole ear portion of the electrode assembly due to insufficient guide area.

[0014] In some embodiments, the guide segment is welded to the sub-pole ear to form a weld portion, and the length of the weld portion in the circumferential direction of the current collecting component is greater than or equal to 5% of the circumference of the circle where the corresponding sub-pole ear is located.

[0015] In the above technical solution, the length of the welding portion formed by welding the guide section and the sub-pole ear in the circumferential direction of the current collecting component is set to be not less than 5% of the circumference of the corresponding sub-pole ear. That is to say, the welding length of each sub-pole ear and the current collecting component is not less than 5% of the circumference of the corresponding sub-pole ear. This is beneficial to improving the welding stability between each sub-pole ear and the current collecting component on the one hand, and can effectively ensure the guide area of each sub-pole ear and the current collecting component on the other hand, so as to reduce the risk of temperature rise inside the battery cell due to excessive local overcurrent in the sub-pole ear.

[0016] In some embodiments, the sub-pole ear portion extends along the circumference of the current collecting component, and in the circumferential direction of the current collecting component, the sub-pole ear portion is located between the two adjacent confluence sections; a plurality of notches are provided on the sub-pole ear portion, and the plurality of notches are arranged at intervals along the circumference of the current collecting component, and along the circumference of the current collecting component, the sub-pole ear portion forms a pole ear segment connected to the guide section between each adjacent two notches.

[0017] In the above technical solution, a plurality of notches are provided on the sub-pole ear portion and are arranged at intervals along the circumference of the current collecting component, that is, the sub-pole ear portion is provided with a plurality of notches at intervals in its extension direction, so as to form a pole ear segment for connecting to the side of the guide section away from the main body of the electrode assembly between each two adjacent notches. Thus, this structure can, on the one hand, facilitate the bending of the sub-pole ear portion after passing through the avoidance area so that the sub-pole ear portion can be connected to the guide section, and on the other hand, can effectively alleviate the phenomenon of wrinkles on the sub-pole ear portion when it is bent and connected to the guide section.

[0018] In some embodiments, the lengths of the plurality of guide segments in the circumferential direction of the current collecting component gradually increase from the inside to the outside.

[0019] In the above technical solution, since the circumference of the multiple sub-pole ears of the pole ear portion gradually increases from the inside to the outside along the radial direction of the current collecting component, the lengths of the multiple guide segments on the current collecting component are set to increase successively from the inside to the outside to ensure that each guide segment has sufficient length to connect with the corresponding sub-pole ear portion, thereby ensuring the connection area between each guide segment and the corresponding sub-pole ear portion, so as to achieve uniform current conduction between the pole ear portion and the current collecting component.

[0020] In some embodiments, along the radial direction of the current collecting component, the width of the guide segment is greater than or equal to the length of the portion of the sub-pole ear connected to the guide segment.

[0021] In the above technical solution, by setting the width of the guide section in the radial direction of the current collecting component to be no less than the length of the sub-pole ear connected to the guide section, that is, in the radial direction of the current collecting component, the length of the sub-pole ear connected to the guide section is within the width range of the guide section, thereby effectively reducing the redundancy caused by the excessive length of the sub-pole ear, and effectively reducing the risk of the redundant sub-pole ear being inserted into the main body of the electrode assembly.

[0022] In some embodiments, the width of the converging section in the circumferential direction of the current collecting component is greater than the width of the guiding section in the radial direction of the current collecting component.

[0023] In the above technical solution, by setting the width of the bus section to be larger than the width of the guide section, the guide area of the bus section can be effectively guaranteed when the guide section merges through the bus section, so as to alleviate the phenomenon of temperature rise in the bus section due to excessive overcurrent, which is beneficial to reduce the risk of using battery cells.

[0024] In some embodiments, the first connecting portion is an annular structure extending along the circumference of the current collecting member, and a width of the first connecting portion in the radial direction of the current collecting member is greater than a width of the converging section in the circumferential direction of the current collecting member.

[0025] In the above technical solution, by setting the width of the first connecting part to be larger than the width of the confluence section, the guide area of the first connecting part can be effectively guaranteed when the confluence section converges through the first connecting part, so as to alleviate the temperature rise of the first connecting part due to excessive overcurrent, thereby helping to reduce the risk of using battery cells.

[0026] In some embodiments, the housing assembly has a wall portion, the wall portion is provided with an electrode lead-out hole, the electrode lead-out portion is installed in the electrode lead-out hole, and at least part of the electrode lead-out portion protrudes from the outside of the wall portion; a plurality of second connection portions are distributed on the outer peripheral side of the first connection portion along the circumference of the current collecting component, and the second connection portions are connected to the first connection portion.

[0027] In the above technical solution, the wall of the housing assembly is provided with an electrode lead-out hole for mounting the electrode lead-out portion. At least a portion of the electrode lead-out portion protrudes from the exterior of the wall, thereby enabling the input or output of electrical energy through the electrode lead-out portion. Furthermore, a plurality of second connecting portions are connected to the outer periphery of the first connecting portion at intervals along the circumference of the current collecting member, thereby facilitating connection between the first connecting portion and the electrode lead-out portion. This results in a simple structure and facilitates assembly.

[0028] In some embodiments, the housing assembly has a wall portion, which is the electrode lead-out portion; a plurality of second connection portions are distributed on the inner circumferential side of the first connection portion along the circumference of the current collecting component, and the second connection portions are connected to the first connection portion.

[0029] In the above technical solution, the wall portion of the shell assembly serves as the electrode lead-out portion to realize the input or output of electrical energy. By connecting a plurality of second connection portions to the inner peripheral side of the first connection portion at intervals along the circumference of the current collecting component, the first connection portion is facilitated to be connected to the wall portion of the shell assembly, which is convenient for assembly and helps to ensure the connection area between the first connection portion and the wall portion of the shell assembly.

[0030] In some embodiments, the current collecting member further includes a fixing portion, a plurality of second connecting portions are distributed on an outer circumferential side of the fixing portion along a circumferential direction of the current collecting member, and the second connecting portions are connected to the fixing portion and the first connecting portions.

[0031] In the above technical solution, the current collecting component is also provided with a fixing portion. By arranging a plurality of second connecting portions at intervals along the circumference of the current collecting component on the outer peripheral side of the fixing portion, the fixing portion is located on the inner peripheral side of the first connecting portion, and the fixing portion is connected to the first connecting portion through a plurality of second connecting portions, which is beneficial to improving the structural stability and reliability of the current collecting component.

[0032] In some embodiments, the shell assembly includes a shell and an end cover; the shell includes a bottom wall and a side wall, the side wall is arranged around the bottom wall, one end of the side wall is connected to the bottom wall, and the other end of the side wall forms an opening opposite to the bottom wall, the end cover covers the opening, and the wall portion is the bottom wall or the end cover.

[0033] In the above technical solution, the housing assembly is provided with a shell and an end cover. An opening is formed at one end of the shell, and the end cover covers the opening so that the housing assembly can accommodate the electrode assembly. This structure is simple and easy to implement.

[0034] In some embodiments, the main body is provided with the pole ear portion at both ends in its extension direction; the shell assembly includes two electrode lead-out portions; the battery cell includes two current collecting components, which are respectively located at both ends of the main body, and each current collecting component is used to connect one pole ear portion and one electrode lead-out portion.

[0035] In the above technical solution, two current collecting components are arranged in the shell assembly so that each current collecting component can be connected to a pole ear portion and an electrode lead portion, thereby ensuring the connection stability and current conduction uniformity between the two pole ear portions of the electrode assembly and the corresponding electrode lead portion of the shell assembly.

[0036] In some embodiments, the main body has a central channel, which extends along the extension direction of the main body and passes through both ends of the main body; the battery cell also includes an insulating support member, which is inserted into the central channel, and the two ends of the insulating support member are respectively connected to the two current collecting components.

[0037] In the above technical solution, an insulating support is inserted into the central channel of the main body of the electrode assembly so that two current collecting components can be connected to the two ends of the insulating support. On the one hand, the insulating support can fix the position of the current collecting component relative to the main body of the electrode assembly, so as to facilitate the connection of the sub-pole ear portion of the pole ear portion to the corresponding current collecting component. On the other hand, it can increase the stability of the current collecting component assembled in the shell assembly.

[0038] In some embodiments, along the extension direction of the main body, a distance between two current collecting members is greater than a length of the main body.

[0039] In the above technical solution, by setting the distance between the two current collecting components in the extension direction of the main body to be greater than the length of the main body, a gap can be set between the current collecting components and the main body, which is beneficial to increase the space for the electrolyte to infiltrate the main body of the electrode assembly.

[0040] In some embodiments, a mounting portion is protruded from a side of the current collecting component facing the main body, and the insulating support is sleeved on the outer side of the mounting portion.

[0041] In the above technical solution, the insulating support is sleeved on the outer side of the mounting portion of the current collecting member to facilitate connection between the insulating support and the current collecting member, thereby facilitating installation and saving assembly time of the battery cell.

[0042] In some embodiments, a mounting portion is protruded from a side of the current collecting component facing the main body, and the mounting portion is sleeved on the outer side of the insulating support member.

[0043] In the above technical solution, by sleeve-mounting the mounting portion of the current collecting component on the outside of the insulating support, that is, the insulating support is inserted into the mounting portion, the battery cell adopting this structure is beneficial to increase the wall thickness of the insulating support without occupying the space of the electrode assembly, that is, the wall thickness of the insulating support can be increased without losing the capacity of the battery cell, thereby helping to improve the structural strength of the insulating support and enhance the deformation resistance of the insulating support.

[0044] In a second aspect, an embodiment of the present application further provides a battery comprising a plurality of the above-mentioned battery cells.

[0045] In a third aspect, an embodiment of the present application further provides an electrical device comprising the above-mentioned battery.

[0046] In a fourth aspect, an embodiment of the present application further provides a method for manufacturing a battery cell, comprising:

[0047] Providing a housing assembly, the housing assembly including an electrode lead-out portion for inputting or outputting electrical energy;

[0048] Providing an electrode assembly, the electrode assembly comprising a main body and an electrode ear portion protruding from the main body;

[0049] providing a current collecting component;

[0050] installing the electrode assembly in the housing assembly;

[0051] connecting the current collecting component to the pole lug portion;

[0052] connecting the electrode lead portion to the current collecting member;

[0053] The pole ear portion includes a plurality of sub-pole ear portions, and the current collecting component has a plurality of avoidance areas, each of which is used for allowing at least part of a sub-pole ear portion to pass through, so that the sub-pole ear portion can be connected to the side of the current collecting component away from the main body portion.

[0054] In the fifth aspect, an embodiment of the present application also provides a manufacturing device for a battery cell, comprising a first providing device, a second providing device, a third providing device, a first assembling device, a second assembling device and a third assembling device; the first providing device is used to provide a shell assembly, the shell assembly comprising an electrode lead-out portion for inputting or outputting electrical energy; the second providing device is used to provide an electrode assembly, the electrode assembly comprising a main body and a pole ear portion protruding from the main body; the third providing device is used to provide a current collecting component; the first assembling device is used to install the electrode assembly in the shell assembly; the second assembling device is used to connect the current collecting component to the pole ear portion; the third assembling device is used to connect the electrode lead-out portion to the current collecting component; wherein, the pole ear portion comprises a plurality of sub-pole ear portions, and the current collecting component has a plurality of avoidance areas, each of the avoidance areas is used to allow at least a portion of a sub-pole ear portion to pass through, so that the sub-pole ear portion can be connected to the side of the current collecting component facing away from the main body portion. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0056] Figure 1 A schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0057] Figure 2 An exploded view of the structure of a battery provided in some embodiments of the present application;

[0058] Figure 3 An exploded view of the structure of a battery cell provided in some embodiments of the present application;

[0059] Figure 4 A cross-sectional view of a battery cell provided for some embodiments of the present application;

[0060] Figure 5 for Figure 4 A partial enlarged view of the battery cell at point A shown;

[0061] Figure 6 A schematic structural diagram of a current collecting component provided in some embodiments of the present application;

[0062] Figure 7 A bottom view of a current collecting component provided in some embodiments of the present application;

[0063] Figure 8 A schematic diagram of the connection between the current collecting member and the electrode assembly provided in some embodiments of the present application;

[0064] Figure 9 for Figure 4 A partial enlarged view of the battery cell at point B shown;

[0065] Figure 10 A schematic structural diagram of a current collecting component provided in some other embodiments of the present application;

[0066] Figure 11 A bottom view of a current collecting component provided in some other embodiments of the present application;

[0067] Figure 12 A schematic diagram of the connection between the insulating support and the current collecting member provided in some embodiments of the present application;

[0068] Figure 13 A partial cross-sectional view of the connection between the insulating support member and the current collecting member provided in some embodiments of the present application;

[0069] Figure 14A partial cross-sectional view of the connection between the insulating support and the current collecting member provided in some other embodiments of the present application;

[0070] Figure 15 A schematic flow chart of a method for manufacturing a battery cell according to some embodiments of the present application;

[0071] Figure 16 A schematic block diagram of a battery cell manufacturing device provided in some embodiments of the present application.

[0072] Icons: 1000 - vehicle; 100 - battery; 10 - housing; 11 - first part; 12 - second part; 20 - battery cell; 21 - housing assembly; 211 - housing; 212 - end cap; 213 - electrode terminal; 214 - insulating plastic; 22 - electrode assembly; 221 - main body; 222 - pole ear; 2221 - sub-pole ear; 23 - current collecting member; 231 - avoidance area; 232 - first connecting portion; 233-second connecting part; 2331-confluence section; 2332-conducting section; 234-fixing part; 235-installation part; 24-insulating support member; 200-controller; 300-motor; 2000-manufacturing equipment; 2100-first providing device; 2200-second providing device; 2300-third providing device; 2400-first assembling device; 2500-second assembling device; 2600-third assembling device. 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 cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

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

[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. A battery generally includes a housing that encloses one or more battery cells or multiple battery modules. The housing prevents liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0082] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly consists of a positive electrode sheet, a negative electrode sheet, and a separator. A battery cell primarily operates by the movement of metal ions between the positive and negative electrode sheets. The positive electrode sheet includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive electrode collector. The uncoated positive electrode collector protrudes from the coated positive electrode collector, and the uncoated positive electrode collector serves as the positive electrode tab. For lithium-ion batteries, for example, the positive electrode current collector can be made of aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide. The negative electrode sheet includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative electrode collector. The uncoated negative electrode collector protrudes from the coated negative electrode collector, and the uncoated negative electrode collector serves as the negative electrode tab. The negative electrode current collector can be made of copper, and the negative electrode active material can be carbon or silicon, etc. In order to ensure that a large current can pass without melting, the positive electrode tabs are multiple and stacked together, and the negative electrode tabs are multiple and stacked together.

[0083] The material of the isolation film may be PP (polypropylene) or PE (polyethylene), etc. In addition, the electrode assembly may be a wound structure or a laminated structure, but the embodiments of the present application are not limited thereto.

[0084] Batteries offer outstanding advantages, including high energy density, low environmental pollution, high power density, long service life, wide adaptability, and low self-discharge coefficient, making them a crucial component of new energy development. A battery cell is an electrode assembly (bare cell) composed of a positive electrode sheet, a negative electrode sheet, and a separator, assembled through winding or lamination. This assembly is then enclosed in a housing and filled with electrolyte. However, with the continuous advancement of battery technology, higher requirements have been placed on battery quality and safety. Therefore, the safety performance of the battery cell determines the safety of the battery during use.

[0085] The inventors discovered that for typical battery cells, the electrode assembly needs to be electrically connected to the housing and the electrode terminals mounted on the housing, so that the housing and the electrode terminals serve as the negative and positive output electrodes of the battery cell. To facilitate the electrical connection of the electrode assembly's tabs to the housing or electrode terminals, a current collecting member is typically provided within the housing, and the tabs are fully flattened. This allows the tabs to be electrically connected to the housing or electrode terminals via the current collecting member, thereby achieving electrical connection between the electrode assembly and the housing. However, battery cells employing this structure are prone to the generation of powder particles during the tab flattening process, which can cause short circuits in the battery cells. Furthermore, the tabs suffer from poor shaping and insufficient flow conduction area. Furthermore, the welding stability and consistency between the tabs and the current collecting member are low, which can easily lead to desoldering of the tabs and the current collecting member, as well as uneven flow conduction between the tabs and the current collecting member. This can cause internal temperature rise in the battery cell, leading to significant safety hazards during subsequent use of the battery cell, and is detrimental to consumer safety.

[0086] Based on the above considerations, in order to solve the problem that the battery cell has a major safety hazard during the later use process, which is not conducive to the safety of consumers, the inventors have designed a battery cell after in-depth research. The battery cell includes a shell assembly, an electrode assembly and a current collecting component. The shell assembly has an electrode lead-out portion for inputting or outputting electrical energy. The electrode assembly is arranged in the shell assembly, and the electrode assembly includes a main body and a pole ear portion protruding from the main body. The current collecting component is arranged in the shell assembly, and the current collecting component is connected to the electrode lead-out portion and the pole ear portion so that the pole ear portion can be electrically connected to the electrode lead-out portion. Among them, the pole ear portion includes a plurality of sub-pole ear portions, and the current collecting component has a plurality of avoidance areas, each avoidance area can allow at least a portion of a sub-pole ear portion to pass through, and the sub-pole ear portion is connected to the side of the current collecting component away from the main body of the electrode assembly after passing through the avoidance area.

[0087] In the above-mentioned battery cell, the sub-pole ear of the pole ear of the electrode assembly is passed through the avoidance area of the current collecting component, and the sub-pole ear is connected to the side of the current collecting component away from the main body after passing through the current collecting component. The battery cell with this structure is beneficial to improving the connection stability between the sub-pole ear and the current collecting component, thereby reducing the risk of falling off between the sub-pole ear and the current collecting component during later use, so as to ensure the reliability of the battery cell and improve the service life of the battery cell; on the other hand, it is convenient to connect the sub-pole ear with the current collecting component during the production process, which is beneficial to improving the consistency of the connection of multiple sub-pole ears to the current collecting component, so as to reduce the phenomenon of uneven current diversion between the pole ear and the current collecting component, and thus can alleviate the phenomenon of temperature rise of the battery cell due to excessive local overcurrent, so as to reduce the safety hazards of the battery cell during later use, which is beneficial to ensure the safety of consumers.

[0088] In addition, the electrode assembly of the battery cell using this structure does not need to adopt a structure with full-tab flattening, which can effectively alleviate the phenomenon of short circuit in the battery cell caused by powder particles generated during the flattening process of the tabs of the electrode assembly, and is conducive to improving the problems of poor shaping and insufficient conduction area of the tabs after flattening.

[0089] 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 in this application can be used to effectively improve the safety of the battery.

[0090] 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.

[0091] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0092] Please refer to Figure 1 , Figure 1A schematic structural diagram of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000. The battery 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000. For example, the battery 100 may serve as an operating power source for the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to power the motor 300, for example, to meet the power requirements for starting, navigating and driving the vehicle 1000.

[0093] 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.

[0094] Please refer to Figure 2 , Figure 2 An exploded diagram of the structure of a battery 100 provided in some embodiments of the present application. The battery 100 includes a housing 10 and a battery cell 20, which is intended to be housed within the housing 10. The housing 10 is used to provide a storage space for the battery cell 20 and can have various structures. In some embodiments, the housing 10 can include a first portion 11 and a second portion 12, which overlap each other and together define a storage space for the battery cell 20. The second portion 12 can be a hollow structure with one end open. The first portion 11 can be a plate-like structure, which overlaps the open side of the second portion 12, so that the first portion 11 and the second portion 12 together define a storage space. The first portion 11 and the second portion 12 can 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 can have various shapes, such as a cylinder, a rectangular parallelepiped, etc.

[0095] In the battery 100, there may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections among the multiple battery cells 20. The multiple battery cells 20 may be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery cell 20 may be housed within the housing 10. Alternatively, the battery 100 may be constructed by first connecting multiple battery cells 20 in series, in parallel, or in a hybrid connection to form a battery module, which is then connected in series, in parallel, or in a hybrid connection to form a complete battery module, and then housed within the housing 10. The battery 100 may also include other structures, such as a busbar assembly for electrically connecting the multiple battery cells 20.

[0096] Each battery cell 20 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto. The battery cell 20 can be cylindrical, flat, rectangular or other shapes. For example, in Figure 2 In the embodiment, the battery cell 20 is cylindrical.

[0097] According to some embodiments of this application, please refer to Figure 3 、 Figure 4 and Figure 5 , Figure 3 This is an exploded view of the structure of the battery cell 20 provided in some embodiments of the present application. Figure 4 A cross-sectional view of a battery cell 20 provided in some embodiments of the present application is shown. Figure 5 for Figure 4 A partial enlarged view of point A of the battery cell 20 shown. The present application provides a battery cell 20 housing assembly 21, an electrode assembly 22 and a current collecting member 23. The housing assembly 21 includes an electrode lead-out portion for inputting or outputting electrical energy. The electrode assembly 22 is accommodated in the housing assembly 21, and the electrode assembly 22 includes a main body 221 and a pole ear portion 222 protruding from the main body 221. The current collecting member 23 is accommodated in the housing assembly 21, and the current collecting member 23 is used to connect the electrode lead-out portion and the pole ear portion 222 so that the pole ear portion 222 is electrically connected to the electrode lead-out portion. Among them, the pole ear portion 222 includes a plurality of sub-pole ear portions 2221, and the current collecting member 23 has a plurality of avoidance areas 231, each avoidance area 231 is used for allowing at least a portion of a sub-pole ear portion 2221 to pass through, so that the sub-pole ear portion 2221 can be connected to the side of the current collecting member 23 facing away from the main body 221.

[0098] Among them, each avoidance area 231 is used for at least part of a sub-pole ear 2221 to pass through, so that the sub-pole ear 2221 can be connected to the side of the current collecting component 23 away from the main body 221, that is, the sub-pole ear 2221 is connected to the side of the current collecting component 23 away from the main body 221 after passing through the avoidance area 231 and the current collecting component 23. The sub-pole ear 2221 and the current collecting component 23 can be welded to each other or can be in contact with each other, so that the electrode assembly 22 and the current collecting component 23 are electrically connected, thereby realizing current conduction between the electrode assembly 22 and the current collecting component 23.

[0099] Illustratively, the sub-pole ear portion 2221 is welded to a side of the current collecting member 23 facing away from the main body portion 221 .

[0100] It should be noted that one end of the electrode assembly 22 is formed with multiple tabs extending along the circumference of the current collecting member 23. The tabs are the portions of the electrode current collector not coated with the active material layer, and the multiple tabs are arranged sequentially along the radial direction of the current collecting member 23. In this embodiment, the sub-pole tab portion 2221 includes at least one tab segment. That is, the sub-pole tab portion 2221 can be a single tab segment or multiple tab segments arranged in a stacked manner. In other words, the tab passing through each avoidance region 231 can be a single tab segment or multiple tab segments, and the tab is bent after passing through the avoidance region 231 to enable the tab to be welded to the side of the current collecting member 23 facing away from the main body 221.

[0101] The housing assembly 21 can also be used to accommodate an electrolyte, such as an electrolyte solution. The housing assembly 21 can have various structural forms. The housing assembly 21 can also be made of various materials, such as copper, iron, aluminum, steel, and aluminum alloys.

[0102] In some embodiments, the housing assembly 21 may include a shell 211 and an end cap 212. The shell 211 is a hollow structure with an opening on one side. The end cap 212 covers the opening of the shell 211 and forms a sealed connection, thereby forming a sealed space for accommodating the electrode assembly 22 and the electrolyte. When assembling the battery cell 20, the electrode assembly 22 can be placed in the shell 211 first, and the electrolyte can be filled into the shell 211. The end cap 212 is then closed over the opening of the shell 211.

[0103] The shell 211 can be in various shapes, such as a cylinder, a cuboid, etc. The shape of the shell 211 can be determined according to the specific shape of the electrode assembly 22. For example, if the electrode assembly 22 is a cylindrical structure, a cylindrical shell 211 can be selected; if the electrode assembly 22 is a cuboid structure, a cuboid shell 211 can be selected. Of course, the end cap 212 can also be in various structures, such as a plate-like structure, a hollow structure with one end open, etc. For example, in Figure 3 In the embodiment, the electrode assembly 22 is a cylindrical structure, and the shell 211 is a cylindrical shell 211.

[0104] It is understandable that the shell assembly 21 is not limited to the above structure. The shell assembly 21 can also be other structures. For example, the shell assembly 21 includes a shell 211 and two end covers 212. The shell 211 is a hollow structure with openings on opposite sides. One end cover 212 corresponds to an opening of the shell 211 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 22 and the electrolyte.

[0105] In this embodiment, the electrode assembly 22 has a positive electrode and a negative electrode for inputting or outputting electrical energy to realize the power supply function of the battery cell 20. The current collecting member 23 is a component for connecting the tabs of the electrode assembly 22 and the electrode lead portion to achieve electrical connection between the tabs and the electrode lead portion.

[0106] The battery cell 20 can be of various structures. For example, Figure 3 In the embodiment, the battery cell 20 includes two current collecting members 23. Correspondingly, both ends of the main body 221 of the electrode assembly 22 are provided with pole ear portions 222 (i.e., both ends of the main body 221 have multiple pole ears, and the pole ears at both ends of the main body 221 are respectively the portion of the positive electrode sheet of the electrode assembly 22 that is not coated with the positive electrode active material layer and the portion of the negative electrode sheet of the electrode assembly 22 that is not coated with the negative electrode active material layer. In other words, the pole ears at both ends of the main body 221 are respectively connected to the positive electrode current collector and the negative electrode sheet of the positive electrode sheet. The outer shell assembly 21 includes two electrode lead-out portions (the two electrode lead-out portions are used to input or output the positive electrode power and negative electrode power of the battery cell 20, respectively. The electrode lead-out portions can be the shell 211 or the end cover 212, or can be electrode terminals connected to the shell 211 or the end cover 212). Each current collecting component 23 is used to electrically connect a pole ear portion 222 and an electrode lead-out portion. Of course, in other embodiments, the battery cell 20 may also include only one current collecting component 23, and the current collecting component 23 can be connected between the pole tab of the positive current collector of the positive electrode sheet and the electrode lead-in portion for inputting or outputting the positive electrode electrical energy of the battery cell 20 to achieve electrical connection between the pole tab of the positive current collector of the positive electrode sheet and the electrode lead-in portion for inputting or outputting the positive electrode electrical energy of the battery cell 20, or can be connected between the pole tab of the negative current collector of the negative electrode sheet and the electrode lead-in portion for inputting or outputting the negative electrode electrical energy of the battery cell 20 to achieve electrical connection between the pole tab of the negative current collector of the negative electrode sheet and the electrode lead-in portion for inputting or outputting the negative electrode electrical energy of the battery cell 20.

[0107] The electrode assembly 22 is a component in the battery cell 20 where the electrochemical reaction occurs. The electrode assembly 22 may include a positive electrode sheet, a negative electrode sheet, and a separator. The electrode assembly 22 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. For example, in Figure 3 In the embodiment, the electrode assembly 22 is a wound structure formed by winding a positive electrode sheet, a separator and a negative electrode sheet.

[0108] In some embodiments, the battery cell 20 may further include a pressure relief mechanism mounted on the end cap 212. The pressure relief mechanism is used to release the pressure inside the battery cell 20 when the internal pressure or temperature of the battery cell 20 reaches a predetermined value.

[0109] Illustratively, the pressure relief mechanism may be a component such as an explosion-proof valve, an explosion-proof disk, an air valve, a pressure relief valve, or a safety valve.

[0110] The electrode assembly 22 is provided with a main body 221 and a pole ear portion 222 protruding from the main body 221. The pole ear portion 222 includes a plurality of sub-pole ear portions 2221, and the current collecting member 23 has a plurality of avoidance areas 231. By passing each sub-pole ear portion 2221 through an avoidance area 231, and connecting the sub-pole ear portion 2221 to the side of the current collecting member 23 away from the main body 221 after passing through the current collecting member 23, the battery cell 20 with such a structure is conducive to improving the connection stability between the sub-pole ear portion 2221 and the current collecting member 23, thereby reducing the sub-pole ear portion 2221 and the current collecting member 23 during later use. The risk of detachment between the current collecting components 23 is reduced, thereby ensuring the reliability of the battery cell 20 and improving the service life of the battery cell 20. On the other hand, it is convenient to connect the sub-pole ear portion 2221 with the current collecting component 23 during the manufacturing process, thereby improving the consistency of the connection between the multiple sub-pole ear portions 2221 and the current collecting component 23, reducing the phenomenon of uneven current conduction between the pole ear portion 222 and the current collecting component 23, and thus alleviating the phenomenon of temperature rise in the battery cell 20 due to excessive local overcurrent, thereby reducing the safety risks of the battery cell 20 during later use, and ensuring the safety of consumers. In addition, the electrode assembly 22 of the battery cell 20 adopting this structure does not need to adopt a full-pole ear flattening structure, which can effectively alleviate the phenomenon of powder particles generated during the flattening process of the pole ear of the electrode assembly 22 causing short circuits in the battery cell 20, and is conducive to improving the problems of poor shaping and insufficient conduction area of the flattened pole ear.

[0111] According to some embodiments of the present application, referring to Figure 5 , and please refer to Figure 6 、 Figure 7 and Figure 8 As shown, Figure 6 This is a schematic structural diagram of the current collecting component 23 provided in some embodiments of the present application. Figure 7 A bottom view of the current collecting member 23 provided in some embodiments of the present application, Figure 8 Schematic diagram of the connection between the current collecting member 23 and the electrode assembly 22 provided in some embodiments of the present application. The current collecting member 23 includes a first connecting portion 232 and multiple second connecting portions 233. The first connecting portion 232 is used to connect to the electrode lead. Multiple second connecting portions 233 are spaced apart from the first connecting portion 232 along the circumference of the current collecting member 23. The second connecting portions 233 have at least one avoidance area 231 and are used to connect to the sub-electrode lug 2221.

[0112] Among them, multiple second connection parts 233 are arranged at intervals on the first connection part 232 along the circumferential direction of the current collecting component 23, that is, multiple second connection parts 233 are arranged around the center position of the current collecting component 23 and at intervals on the first connection part 232, that is, the circumferential direction of the current collecting component 23 is the circumferential direction of the center position of the current collecting component 23.

[0113] Exemplarily, the current collecting member 23 is provided with three second connection parts 233, which are spaced apart along the circumference of the current collecting member 23 and evenly arranged on the first connection part 232. Of course, in other embodiments, the number of the second connection parts 233 can also be two, four, five or six.

[0114] The current collecting component 23 is provided with a first connecting portion 232 and multiple second connecting portions 233. By arranging multiple second connecting portions 233 on the first connecting portion 232 along the circumference of the current collecting component 23, and each second connecting portion 233 has at least one avoidance area 231, on the one hand, it is convenient to connect the first connecting portion 232 with the electrode lead-out portion of the shell assembly 21, and on the other hand, it enables the current collecting component 23 to be connected to the sub-pole ear portions 2221 of the pole ear portion 222 in different areas of the circumference of the current collecting component 23, so as to ensure the connection stability between the current collecting component 23 and the pole ear portion 222.

[0115] According to some embodiments of this application, see Figure 6 、 Figure 7 and Figure 8 As shown, the second connection portion 233 has a plurality of escape areas 231 arranged at intervals along the radial direction of the current collecting member 23 .

[0116] Among them, multiple avoidance areas 231 are arranged at intervals along the radial direction of the current collecting component 23, that is, the arrangement direction of the multiple avoidance areas 231 passes through the center position of the current collecting component 23, that is, the radial direction of the current collecting component 23 is the direction from the center position of the current collecting component 23 to the edge of the current collecting component 23 or from the edge of the current collecting component 23 to the center position of the current collecting component 23.

[0117] By providing a plurality of avoidance areas 231 arranged at intervals along the radial direction of the current collecting component 23 on the second connecting portion 233, a plurality of sub-pole ear portions 2221 of the pole ear portion 222 in different radial regions of the current collecting component 23 can pass through the corresponding avoidance areas 231 and then be connected to the second connecting portion 233, thereby increasing the connection area between the pole ear portion 222 of the electrode assembly 22 and the current collecting component 23, and further facilitating the flow conduction area between the pole ear portion 222 and the current collecting component 23, so as to reduce the risk of polarization of the pole ear portion 222 of the electrode assembly 22 due to insufficient flow conduction area.

[0118] According to some embodiments of this application, see Figure 6 and Figure 7 As shown, the second connection portion 233 includes a converging section 2331 and multiple flow-guiding sections 2332. The converging section 2331 is connected to the first connection portion 232 and extends radially along the current collecting member 23. The flow-guiding sections 2332 are connected to the converging section 2331. The multiple converging sections 2331 are spaced apart in the radial direction of the current collecting member 23 and extend circumferentially along the current collecting member 23. In the radial direction of the current collecting member 23, the second connection portion 233 forms avoidance regions 231 on both sides of the flow-guiding sections 2332. The sub-pole lugs 2221 are connected to the side of the flow-guiding sections 2332 facing away from the main body 221.

[0119] Among them, avoidance areas 231 are formed on both sides of the guide section 2332 in the radial direction of the current collecting component 23, that is, the gaps on both sides of the guide section 2332 in the radial direction of the current collecting component 23 can allow the sub-pole ear 2221 of the pole ear 222 to pass through, so that the sub-pole ear 2221 can be welded to the corresponding guide section 2332 after passing through the avoidance area 231.

[0120] For example, each second connecting portion 233 is provided with five flow guiding sections 2332. In other embodiments, the number of the flow guiding sections 2332 may also be two, three, four, or six.

[0121] It should be noted that after passing through the avoidance area 231, the sub-pole ear 2221 can be bent along the radial direction of the current collecting component 23 toward the center position of the current collecting component 23 and then welded to the guide section 2332, or it can be bent along the radial direction of the current collecting component 23 toward the center position of the current collecting component 23 and then welded to the guide section 2332.

[0122] The second connection portion 233 is provided with a bus section 2331 and a plurality of guide sections 2332. The bus section 2331 extends radially along the current collecting component 23 and is connected to the first connection portion 232. By arranging a plurality of guide sections 2332 at intervals along the radial direction of the current collecting component 23, and the guide sections 2332 extend circumferentially along the current collecting component 23, that is, a plurality of guide sections 2332 are connected to the bus section 2331 at intervals along the extension direction of the bus section 2331, and the guide sections 2332 are arc-shaped structures extending circumferentially along the current collecting component 23, thereby forming an avoidance area 231 for the sub-pole ear 2221 to pass through on both sides of the guide section 2332 in the radial direction of the current collecting component 23, and the avoidance area 231 extends circumferentially along the current collecting component 23, so as to facilitate the sub-pole ear 2221 to pass through the second connection portion 233 of the current collecting component 23. This structure is simple and easy to implement.

[0123] According to some embodiments of this application, see Figure 7 and Figure 8 As shown, any one guide section 2332 in one second connection portion 233 and any one guide section 2332 in another second connection portion 233 are located on different circumferences.

[0124] Among them, any one guide segment 2332 in a second connection part 233 and any one guide segment 2332 in another second connection part 233 are located on different circumferences, that is, in the circumferential direction of the current collecting component 23, each guide segment 2332 is staggered with other guide segments 2332, that is, when each guide segment 2332 extends along the circumferential direction of the current collecting component 23, there is no corresponding overlapping guide segment 2332.

[0125] By setting the guide section 2332 of each second connecting part 233 to be located on different circumferences, the guide section 2332 of each second connecting part 233 can be connected to the sub-pole ear portion 2221 located on different circumferences in the radial direction of the current collecting component 23 of the pole ear portion 222 of the electrode assembly 22, thereby effectively improving the overall connection area between the current collecting component 23 and the pole ear portion 222, and further improving the guide area between the current collecting component 23 and the pole ear portion 222, so as to reduce the risk of polarization of the pole ear portion 222 of the electrode assembly 22 due to insufficient guide area.

[0126] According to some embodiments of the present application, the guide segment 2332 is welded to the sub-pole ear 2221 to form a welding portion, and the length of the welding portion in the circumferential direction of the current collecting component 23 is greater than or equal to 5% of the circumference of the circle where the corresponding sub-pole ear 2221 is located.

[0127] Among them, the length of the welding portion in the circumferential direction of the current collecting component 23 is greater than or equal to 5% of the circumference of the circle where the corresponding sub-pole ear 2221 is located, that is, the length of the weld mark formed by welding the guide section 2332 and the sub-pole ear 2221 in the circumferential direction of the current collecting component 23 is greater than or equal to 5% of the circumference of the circle where the corresponding sub-pole ear 2221 is located, that is, the welding length of each sub-pole ear 2221 and the current collecting component 23 is not less than 5% of the circumference of the corresponding sub-pole ear 2221.

[0128] By setting the circumferential length of the welding portion formed by welding the guide section 2332 and the sub-pole ear 2221 to be no less than 5% of the circumference of the corresponding sub-pole ear 2221, it is beneficial to improve the welding stability between each sub-pole ear 2221 and the current collecting component 23 on the one hand, and on the other hand, it can effectively ensure the guide area of each sub-pole ear 2221 and the current collecting component 23, so as to reduce the risk of temperature rise inside the battery cell 20 due to excessive local overcurrent in the sub-pole ear 2221.

[0129] According to some embodiments of the present application, the sub-pole ear portion 2221 extends along the circumference of the current collecting member 23, and is located between two adjacent converging segments 2331 along the circumference of the current collecting member 23. The sub-pole ear portion 2221 is provided with a plurality of notches, which are spaced apart along the circumference of the current collecting member 23. Along the circumference of the current collecting member 23, the sub-pole ear portion 2221 forms a pole segment connected to the current guiding segment 2332 between each two adjacent notches.

[0130] Among them, in the circumferential direction of the current collecting component 23, the sub-pole ear 2221 is located between the two adjacent confluence sections 2331, that is, the sub-pole ear 2221 composed of at least one section of the pole ear is located between the two confluence sections 2331 in the circumferential direction of the current collecting component 23, so as to facilitate each sub-pole ear 2221 to pass through the corresponding avoidance area 231.

[0131] Along the circumference of the current collecting component 23, the sub-pole ear 2221 forms a pole ear segment connected to the guide segment 2332 between each two adjacent notches, that is, the sub-pole ear 2221 is divided into multiple parts by multiple notches opened on the sub-pole ear 2221, and each part is a pole ear segment. In other words, the sub-pole ear 2221 located between the two converging segments 2331 is a discontinuous structure along the circumference of the current collecting component 23, that is, at least one section of the pole ear constituting the sub-pole ear 2221 is a discontinuous structure along the circumference of the current collecting component 23 between each two adjacent converging segments 2331.

[0132] By providing a plurality of notches on the sub-pole ear 2221 which are arranged at intervals along the circumference of the current collecting component 23, that is, the sub-pole ear 2221 is provided with a plurality of notches at intervals in its extension direction, so as to form a pole ear segment for connecting to the guide section 2332 on the side of the main body 221 of the electrode assembly 22 which faces away from each two adjacent notches. Thus, this structure can, on the one hand, facilitate the bending of the sub-pole ear 2221 after passing through the avoidance area 231 so that the sub-pole ear 2221 can be connected to the guide section 2332, and on the other hand, can effectively alleviate the phenomenon of wrinkles on the sub-pole ear 2221 when it is bent and connected to the guide section 2332.

[0133] According to some embodiments of this application, see Figure 7 and Figure 8 As shown, the lengths of the plurality of flow guiding segments 2332 in the circumferential direction of the flow collecting component 23 gradually increase from the inside to the outside.

[0134] The lengths of the plurality of guide segments 2332 in the circumferential direction of the current collecting component 23 gradually increase from the inside to the outside, that is, the arc lengths of the guide segments 2332 increase successively from the center position of the current collecting component 23 to the edge of the current collecting component 23 .

[0135] Since the circumference of the circle where the multiple sub-pole ears 2221 of the pole ear portion 222 are located gradually increases from the inside to the outside along the radial direction of the current collecting component 23, the lengths of the multiple guide segments 2332 on the current collecting component 23 are set to increase successively from the inside to the outside to ensure that each guide segment 2332 has sufficient length to connect with the corresponding sub-pole ear portion 2221, thereby ensuring the connection area between each guide segment 2332 and the corresponding sub-pole ear portion 2221, so as to achieve uniform flow diversion between the pole ear portion 222 and the current collecting component 23.

[0136] According to some embodiments of this application, please continue to refer to Figure 7 and Figure 8 As shown, along the radial direction of the current collecting component 23 , the width of the guide segment 2332 is greater than or equal to the length of the portion where the sub-pole ear portion 2221 is connected to the guide segment 2332 .

[0137] The width of the guide section 2332 is greater than or equal to the length of the portion where the sub-pole ear 2221 is connected to the guide section 2332 , that is, in the radial direction of the current collecting component 23 , the length where the sub-pole ear 2221 is connected to the guide section 2332 is within the width of the guide section 2332 .

[0138] By setting the radial width of the guide section 2332 in the current collecting component 23 to be no less than the length of the sub-pole ear 2221 connected to the guide section 2332, the redundancy caused by the excessive length of the sub-pole ear 2221 can be effectively reduced, and the risk of the redundant sub-pole ear 2221 being inserted into the main body 221 of the electrode assembly 22 can be effectively reduced.

[0139] According to some embodiments of this application, please continue to refer to Figure 7 and Figure 8 As shown, the width of the converging section 2331 in the circumferential direction of the current collecting component 23 is greater than the width of the guiding section 2332 in the radial direction of the current collecting component 23 .

[0140] By setting the width of the confluence section 2331 to be larger than the width of the guide section 2332, the guide area of the confluence section 2331 can be effectively guaranteed when the guide section 2332 converges through the confluence section 2331, thereby alleviating the temperature rise of the confluence section 2331 due to excessive overcurrent, thereby helping to reduce the risk of using the battery cell 20.

[0141] According to some embodiments of this application, please continue to refer to Figure 7 and Figure 8 As shown, the first connection portion 232 is an annular structure extending along the circumference of the current collecting member 23 , and the width of the first connection portion 232 in the radial direction of the current collecting member 23 is greater than the width of the converging section 2331 in the circumferential direction of the current collecting member 23 .

[0142] By setting the width of the first connection part 232 to be greater than the width of the confluence section 2331, the guide area of the first connection part 232 can be effectively guaranteed when the confluence section 2331 converges through the first connection part 232, thereby alleviating the temperature rise of the first connection part 232 due to excessive overcurrent, which is beneficial to reducing the risk of using the battery cell 20.

[0143] According to some embodiments of this application, see Figure 4 、 Figure 5 and Figure 6 As shown, the housing assembly 21 has a wall portion, which is provided with an electrode lead-out hole. The electrode lead-out portion is mounted in the electrode lead-out hole, and at least a portion of the electrode lead-out portion protrudes from the outside of the wall portion. A plurality of second connecting portions 233 are distributed along the circumference of the current collecting member 23 on the outer periphery of the first connecting portion 232, and the second connecting portions 233 are connected to the first connecting portion 232.

[0144] The housing 211 includes a bottom wall and side walls. The side walls surround the bottom wall, one end of the side wall is connected to the bottom wall, and the other end of the side wall forms an opening opposite the bottom wall. The end cap 212 covers the opening. The wall portion can be the bottom wall of the housing 211 or the end cap 212.

[0145] Exemplarily, the wall portion is the bottom wall of the end of the housing 211 away from the end cap 212. The electrode lead portion is the electrode terminal 213 mounted on the end of the housing 211 away from the end cap 212 and protruding from the outside of the housing 211. The first connection portion 232 is welded to the portion of the electrode lead portion located within the housing 211 to enable the input and output of electrical energy. Of course, in other embodiments, the first connection portion 232 may also abut the bottom wall of the housing 211, so that the housing 211 functions as the electrode lead portion to achieve the input and output of electrical energy.

[0146] In the battery cell 20 of this structure, the electrode lead portion (electrode terminal 213) is insulated and mounted on the housing 211, that is, the electrode lead portion (electrode terminal 213) is connected to the housing 211, but the electrode lead portion (electrode terminal 213) and the housing 211 are insulated, that is, there is no electrical conduction between the electrode lead portion (electrode terminal 213) and the housing 211. For example, see Figure 3 、 Figure 4 and Figure 5 As shown, the electrode lead-out portion (electrode terminal 213) is riveted to one end of the shell 211 away from the end cover 212. The shell assembly 21 may also include an insulating plastic 214, which is arranged between the shell 211 and the electrode lead-out portion (electrode terminal 213) to isolate the electrode lead-out portion and the shell 211, thereby achieving the insulated installation of the electrode lead-out portion (electrode terminal 213) on the shell 211.

[0147] The wall of the housing assembly 21 is provided with an electrode lead-out hole for mounting the electrode lead-out portion. At least a portion of the electrode lead-out portion protrudes from the exterior of the wall, enabling electrical energy to be input or output through the electrode lead-out portion. Multiple second connecting portions 233 are connected to the outer periphery of the first connecting portion 232 at intervals along the circumference of the current collecting member 23, thereby facilitating connection between the first connecting portion 232 and the electrode lead-out portion. This results in a simple structure and facilitates assembly.

[0148] According to some embodiments of the present application, referring to Figure 9 、 Figure 10 and Figure 11 , Figure 9 for Figure 4 The partial enlarged view of the battery cell 20 at B is shown. Figure 10 This is a structural diagram of the current collecting component 23 provided in some embodiments of the present application. Figure 11 This is a bottom view of a current collecting member 23 provided in some further embodiments of the present application. The housing assembly 21 has a wall portion, which serves as an electrode lead-out portion. Multiple second connecting portions 233 are distributed along the circumference of the current collecting member 23, inner to the first connecting portion 232, and are connected to the first connecting portion 232.

[0149] Optionally, the wall portion is an end cap 212, and the first connection portion 232 of the current collecting member 23 is welded to the end cap 212 to enable the input and output of electrical energy. In other embodiments, the first connection portion 232 may also abut against the end cap 212. Of course, in other embodiments, the battery cell 20 may also have other structures. For example, the wall portion may also be the bottom wall of the end of the housing 211 away from the end cap 212. It should be noted that the electrode lead portion may also be an electrode terminal 213 mounted on the housing 211 or the end cap 212, and the electrode terminal 213 is used to input or output electrical energy.

[0150] The wall of the shell component 21 serves as an electrode lead-out portion to realize the input or output of electrical energy. By connecting multiple second connection portions 233 to the inner peripheral side of the first connection portion 232 at intervals along the circumference of the current collecting component 23, it is convenient to connect the first connection portion 232 with the wall of the shell component 21, which is convenient for assembly and helps to ensure the connection area between the first connection portion 232 and the wall of the shell component 21.

[0151] According to some embodiments of this application, see Figure 11 As shown, the current collecting member 23 further includes a fixing portion 234 , a plurality of second connection portions 233 are distributed on the outer periphery of the fixing portion 234 along the circumference of the current collecting member 23 , and the second connection portions 233 are connected to the fixing portion 234 and the first connection portions 232 .

[0152] The second connection portion 233 is connected to the fixing portion 234 and the first connection portion 232 , that is, both ends of the converging section 2331 of the second connection portion 233 in the radial direction of the current collecting component 23 are connected to the fixing portion 234 and the first connection portion 232 respectively.

[0153] Illustratively, the fixing portion 234 is an annular structure extending along the circumference of the current collecting member 23 .

[0154] By arranging multiple second connection parts 233 at intervals along the circumference of the current collecting component 23 on the outer peripheral side of the fixing part 234, the fixing part 234 is located on the inner peripheral side of the first connection part 232, and the fixing part 234 is connected to the first connection part 232 through multiple second connection parts 233, which is beneficial to improving the structural stability and reliability of the current collecting component 23.

[0155] According to some embodiments of this application, see Figure 3 As shown, the housing assembly 21 includes a shell 211 and an end cap 212. The shell 211 includes a bottom wall and a side wall. The side wall is arranged around the bottom wall, one end of the side wall is connected to the bottom wall, and the other end of the side wall forms an opening opposite to the bottom wall. The end cap 212 covers the opening, and the wall portion is the bottom wall or the end cap 212.

[0156] The shell assembly 21 is provided with a shell 211 and an end cover 212. One end of the shell 211 forms an opening, and the end cover 212 covers the opening so that the shell assembly 21 can accommodate the electrode assembly 22. This structure is simple and easy to implement.

[0157] According to some embodiments of this application, please refer to Figure 3 and Figure 4 The main body 221 is provided with tabs 222 at both ends of its extension direction. The housing assembly 21 includes two electrode lead-out portions. The battery cell 20 includes two current collecting members 23, one at each end of the main body 221, each used to connect a tab 222 to an electrode lead-out portion.

[0158] Exemplarily, the two electrode lead-out parts are an end cover 212 and an electrode terminal 213 installed on an end of the shell 211 away from the end cover 212, and a current collecting component 23 is respectively provided between the electrode assembly 22 and the end cover 212 and between the electrode assembly 22 and the electrode terminal 213 to realize the electrical connection between the electrode assembly 22 and the end cover 212 and the electrical connection between the electrode assembly 22 and the electrode terminal 213.

[0159] By arranging two current collecting components 23 in the shell assembly 21, each current collecting component 23 can be connected to a pole ear portion 222 and an electrode lead portion, thereby ensuring the connection stability and current conduction uniformity between the two pole ear portions 222 of the electrode assembly 22 and the corresponding electrode lead portion of the shell assembly 21.

[0160] According to some embodiments of the present application, referring to Figure 4 , and please refer to Figure 12 , Figure 12 Schematic diagram of the connection between the insulating support member 24 and the current collecting member 23 provided in some embodiments of the present application. The main body 221 has a central channel extending along the extension direction of the main body 221 and passing through both ends of the main body 221. The battery cell 20 also includes an insulating support member 24, which is inserted into the central channel and has its ends connected to the two current collecting members 23.

[0161] For example, the insulating support member 24 may be made of insulating materials such as plastic, rubber or the like.

[0162] By inserting an insulating support into the central channel of the main body 221 of the electrode assembly 22, the two current collecting components 23 can be connected to the two ends of the insulating support 24. On the one hand, the insulating support can fix the position of the current collecting component 23 relative to the main body 221 of the electrode assembly 22, so as to facilitate the connection of the sub-pole ear portion 2221 of the pole ear portion 222 to the corresponding current collecting component 23. On the other hand, it can increase the stability of the current collecting component 23 assembled in the outer shell assembly 21.

[0163] According to some embodiments of the present application, along the extension direction of the main body 221 , the distance between the two current collecting members 23 is greater than the length of the main body 221 .

[0164] In the extension direction of the main body 221 , the distance between the two current collecting members 23 is greater than the length of the main body 221 , that is, there is a gap between the current collecting members 23 and the main body 221 in the extension direction of the main body 221 .

[0165] By setting the distance between the two current collecting components 23 in the extension direction of the main body 221 to be greater than the length of the main body 221, a gap can be set between the current collecting components 23 and the main body 221, which is beneficial to increase the space for the electrolyte to infiltrate the main body 221 of the electrode assembly 22.

[0166] According to some embodiments of the present application, referring to Figure 13 , Figure 13 This is a partial cross-sectional view of the insulating support 24 connected to the current collecting member 23 in some embodiments of the present application. In some embodiments, the current collecting member 23 has a mounting portion 235 protruding from one side facing the main body 221 , and the insulating support 24 is sleeved on the outside of the mounting portion 235 .

[0167] The insulating support 24 is a hollow structure with both ends open, and the mounting portion 235 of the current collecting member 23 is inserted into the insulating support 24 to achieve a snap connection between the insulating support 24 and the current collecting member 23. Of course, in other embodiments, the insulating support 24 can also be connected to the insulating support 24 by bonding or other methods.

[0168] Optionally, the mounting portion 235 may be connected to a side of the first connecting portion 232 facing the main body 221 , or may be connected to a side of the fixing portion 234 facing the main body 221 .

[0169] By sleeve-mounting the insulating support 24 on the outside of the mounting portion 235 of the current collecting member 23 , the insulating support 24 and the current collecting member 23 are connected, which facilitates installation and helps save assembly time of the battery cell 20 .

[0170] According to some embodiments of the present application, referring to Figure 14 , Figure 14This is a partial cross-sectional view of the insulating support 24 connected to the current collecting member 23 according to some embodiments of the present application. A mounting portion 235 is provided on one side of the current collecting member 23 facing the main body 221 . The mounting portion 235 is sleeved on the outer side of the insulating support 24 .

[0171] The mounting portion 235 is a hollow structure with one end open, and the insulating support member 24 is inserted into the mounting portion 235 to achieve a snap connection between the insulating support member 24 and the current collecting member 23 .

[0172] Exemplarily, the insulating support member 24 is also a hollow structure with open ends. Of course, in some embodiments, the insulating support member 24 can also be a solid columnar structure.

[0173] By sleeve-mounting the mounting portion 235 of the current collecting component 23 on the outside of the insulating support, that is, the insulating support 24 is inserted into the mounting portion 235, the battery cell 20 adopting this structure is beneficial to increasing the wall thickness of the insulating support 24 without occupying the space of the electrode assembly 22, that is, the wall thickness of the insulating support 24 can be increased without losing the capacity of the battery cell 20, thereby improving the structural strength of the insulating support 24 and enhancing the deformation resistance of the insulating support 24.

[0174] According to some embodiments of the present application, the present application further provides a battery 100 comprising a plurality of battery cells 20 according to any of the above solutions.

[0175] According to some embodiments of the present application, the present application further provides an electrical device, comprising the battery 100 of any of the above solutions, and the battery 100 is used to provide electrical energy to the electrical device.

[0176] The power-consuming device may be any of the aforementioned devices or systems using the battery 100 .

[0177] According to some embodiments of the present application, see Figure 3-Figure 11As shown, the present application provides a battery cell 20, comprising a housing assembly 21, an electrode assembly 22, an insulating support 24, and two current collecting members 23. The housing assembly 21 comprises a shell 211, an end cap 212, and an electrode terminal 213. The shell 211 has a bottom wall and side walls. The side walls are arranged around the bottom wall, one end of the side wall is connected to the bottom wall, and the other end of the side wall forms an opening opposite to the bottom wall. The end cap 212 covers the opening, and the electrode terminal 213 is mounted on the bottom wall of the shell 211. The electrode assembly 22 comprises a main body 221 and two pole lugs 222. The two pole lugs 222 are respectively protruded at both ends of the main body 221 in the extension direction. The pole lug 222 comprises a plurality of sub-pole lugs 2221, each of which is composed of at least one pole lug segment. One of the two current collecting members 23 is used to electrically connect the end cap 212 and one of the pole ear portions 222, and the other current collecting member 23 is used to electrically connect the electrode terminal 213 and the other pole ear portion 222. The current collecting member 23 includes a first connecting portion 232 and a plurality of second connecting portions 233. The first connecting portion 232 is connected to the end cap 212 or the electrode terminal 213. The plurality of second connecting portions 233 are spaced apart from the first connecting portion 232 along the circumference of the current collecting member 23. The second connecting portion 233 includes a bus section 2331 and a plurality of guide sections 2332. The bus section 233 1 is connected to the first connecting portion 232, and the converging section 2331 extends radially of the current collecting member 23. The guide section 2332 is connected to the converging section 2331. Multiple converging sections 2331 are arranged at intervals along the radial direction of the current collecting member 23, and the guide sections 2332 extend circumferentially of the current collecting member 23. Along the radial direction of the current collecting member 23, the second connecting portion 233 has avoidance areas 231 formed on both sides of the guide sections 2332. The avoidance areas 231 are used to allow the sub-pole ears 2221 to pass through, so that the sub-pole ears 2221 are connected to the side of the guide sections 2332 facing away from the main body 221. Any guide section 2332 in one second connecting portion 233 is located on a different circumference from any guide section 2332 in another second connecting portion 233. The insulating support 24 is inserted into the central channel, and both ends of the insulating support 24 are respectively connected to the two current collecting members 23 so that the distance between the two current collecting members 23 in the extending direction of the main body 221 is greater than the length of the main body 221 .

[0178] The present application also provides a method for manufacturing a battery cell 20. Figure 15 , Figure 15 This is a flow chart of a method for manufacturing a battery cell 20 according to some embodiments of the present application. The method includes:

[0179] S100: Providing a housing assembly 21, wherein the housing assembly 21 includes an electrode lead portion for inputting or outputting electrical energy;

[0180] S200: Providing an electrode assembly 22, wherein the electrode assembly 22 includes a main body 221 and an electrode ear 222 protruding from the main body 221;

[0181] S300: providing a current collecting component 23;

[0182] S400: Installing the electrode assembly 22 in the housing assembly 21;

[0183] S500: Connect the current collecting component 23 to the pole ear portion 222;

[0184] S600: Connecting the electrode lead portion to the current collecting member 23;

[0185] Among them, the pole ear portion 222 includes multiple sub-pole ears 2221, and the current collecting component 23 has multiple avoidance areas 231, each avoidance area 231 is used for allowing at least part of a sub-pole ear portion 2221 to pass through, so that the sub-pole ear portion 2221 can be connected to the side of the current collecting component 23 away from the main body portion 221.

[0186] It should be noted that the relevant structures of the battery cells 20 manufactured by the manufacturing methods provided in the above embodiments can refer to the battery cells 20 provided in the above embodiments, and will not be described in detail here.

[0187] The present application also provides a manufacturing device 2000 for a battery cell 20. Figure 16 , Figure 16 This is a schematic block diagram of a manufacturing device 2000 for a battery cell 20 provided in some embodiments of the present application. The manufacturing device 2000 includes a first providing device 2100 , a second providing device 2200 , a third providing device 2300 , a first assembling device 2400 , a second assembling device 2500 and a third assembling device 2600 .

[0188] The first providing apparatus 2100 is used to provide the housing assembly 21, which includes an electrode lead for inputting or outputting electrical energy. The second providing apparatus 2200 is used to provide the electrode assembly 22, which includes a main body 221 and a tab 222 protruding from the main body 221. The third providing apparatus 2300 is used to provide the current collecting member 23. The first assembling apparatus 2400 is used to install the electrode assembly 22 within the housing assembly 21. The second assembling apparatus 2500 is used to connect the current collecting member 23 to the tab 222. The third assembling apparatus 2600 is used to connect the electrode lead to the current collecting member 23.

[0189] Among them, the pole ear portion 222 includes multiple sub-pole ears 2221, and the current collecting component 23 has multiple avoidance areas 231, each avoidance area 231 is used for allowing at least part of a sub-pole ear portion 2221 to pass through, so that the sub-pole ear portion 2221 can be connected to the side of the current collecting component 23 away from the main body portion 221.

[0190] It should be noted that the relevant structures of the battery cells 20 manufactured by the manufacturing equipment 2000 provided by the above embodiment can refer to the battery cells 20 provided by the above embodiments, and will not be repeated here.

[0191] 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.

[0192] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A battery cell, characterized in that: include: a housing assembly, the housing assembly including an electrode lead-out portion for inputting or outputting electrical energy; an electrode assembly, the electrode assembly being accommodated in the housing assembly, the electrode assembly comprising a main body and an electrode ear portion protruding from the main body; as well as a current collecting member, the current collecting member being accommodated in the housing assembly and being used to connect the electrode lead portion and the electrode lug portion so as to electrically connect the electrode lug portion and the electrode lead portion; The pole lug portion includes a plurality of sub-pole lug portions, and the current collecting component has a plurality of avoidance areas, each of the avoidance areas being used for allowing at least a portion of one of the sub-pole lug portions to pass through, so that the sub-pole lug portion can be connected to a side of the current collecting component away from the main body portion; The current collecting component includes a first connecting portion and multiple second connecting portions, the first connecting portion is used to be connected to the electrode lead portion, the multiple second connecting portions are arranged at intervals on the first connecting portion along the circumference of the current collecting component, the second connecting portion has at least one avoidance area, and the second connecting portion is used to be connected to the sub-pole ear portion.

2. The battery cell according to claim 1, wherein: The second connection portion has a plurality of the escape areas arranged at intervals along a radial direction of the current collecting member.

3. The battery cell according to claim 2, characterized in that: The second connecting portion includes: a converging section, the converging section being connected to the first connecting portion and extending in a radial direction of the current collecting component; a plurality of flow guiding sections, the flow guiding sections being connected to the flow converging section, the plurality of flow converging sections being spaced apart in a radial direction of the flow collecting component, and the flow guiding sections extending in a circumferential direction of the flow collecting component; Wherein, along the radial direction of the current collecting component, the second connecting portion forms the avoidance areas on both sides of the guide section, and the sub-pole ear is connected to a side of the guide section away from the main body.

4. The battery cell according to claim 3, characterized in that Any one of the guide sections in one of the second connecting parts and any one of the guide sections in another of the second connecting parts are located on different circumferences.

5. The battery cell according to claim 4, characterized in that The guide segment is welded to the sub-pole ear to form a welding portion, and a length of the welding portion in the circumferential direction of the current collecting component is greater than or equal to 5% of the circumference of the circle where the corresponding sub-pole ear is located.

6. The battery cell according to claim 3, characterized in that The sub-pole ear portion extends along the circumferential direction of the current collecting component, and in the circumferential direction of the current collecting component, the sub-pole ear portion is located between two adjacent converging sections; A plurality of notches are provided on the sub-pole ear portion, and the plurality of notches are arranged at intervals along the circumference of the current collecting component. Along the circumference of the current collecting component, the sub-pole ear portion forms a pole ear segment connected to the guide segment between each two adjacent notches.

7. The battery cell according to claim 3, characterized in that The lengths of the plurality of flow guiding sections in the circumferential direction of the flow collecting component gradually increase from the inside to the outside.

8. The battery cell according to claim 3, characterized in that Along the radial direction of the current collecting component, the width of the guide segment is greater than or equal to the length of the portion of the sub-pole ear connected to the guide segment.

9. The battery cell according to claim 3, characterized in that: The width of the converging section in the circumferential direction of the current collecting component is greater than the width of the guiding section in the radial direction of the current collecting component.

10. The battery cell according to claim 3, characterized in that The first connection portion is an annular structure extending along the circumferential direction of the current collecting component. The width of the first connection portion in the radial direction of the current collecting component is greater than the width of the converging section in the circumferential direction of the current collecting component.

11. The battery cell according to claim 1, wherein The housing assembly has a wall portion, the wall portion is provided with an electrode lead-out hole, the electrode lead-out portion is installed in the electrode lead-out hole, and at least a portion of the electrode lead-out portion protrudes from the outside of the wall portion; A plurality of second connection portions are distributed on an outer peripheral side of the first connection portion along a circumferential direction of the current collecting member, and the second connection portions are connected to the first connection portion.

12. The battery cell according to claim 1, wherein The housing assembly has a wall portion, and the wall portion is the electrode lead portion; A plurality of second connection portions are distributed on an inner circumferential side of the first connection portion along a circumferential direction of the current collecting member, and the second connection portions are connected to the first connection portion.

13. The battery cell according to claim 12, characterized in that: The current collecting member further includes a fixing portion, a plurality of second connection portions are distributed on an outer circumferential side of the fixing portion along a circumferential direction of the current collecting member, and the second connection portions are connected to the fixing portion and the first connection portions.

14. The battery cell according to claim 11 or 12, characterized in that: The housing assembly includes a shell and an end cover; The shell includes a bottom wall and a side wall, the side wall is arranged around the bottom wall, one end of the side wall is connected to the bottom wall, and the other end of the side wall forms an opening opposite to the bottom wall, the end cover covers the opening, and the wall portion is the bottom wall or the end cover.

15. The battery cell according to claim 1, characterized in that The main body is provided with the ear portions at both ends of the main body in its extending direction; The housing assembly includes two electrode lead-out portions; The battery cell includes two current collecting members, which are respectively located at two ends of the main body, and each current collecting member is used to connect one of the electrode tabs and one of the electrode lead-out portions.

16. The battery cell according to claim 15, characterized in that The main body has a central channel, the central channel extends along the extension direction of the main body, and the central channel passes through both ends of the main body; The battery cell further includes an insulating support member, which is inserted into the central channel, and two ends of the insulating support member are respectively connected to the two current collecting members.

17. The battery cell according to claim 16, characterized in that Along an extending direction of the main body, a distance between the two current collecting members is greater than a length of the main body.

18. The battery cell according to claim 16, characterized in that A mounting portion is protruded from one side of the current collecting component facing the main body, and the insulating support is sleeved on the outer side of the mounting portion.

19. The battery cell according to claim 16, characterized in that A mounting portion is protruded from one side of the current collecting component facing the main body, and the mounting portion is sleeved on the outer side of the insulating support.

20. A battery, characterized in that: The invention comprises a plurality of battery cells according to any one of claims 1 to 19.

21. An electrical device, characterized in that: Comprising a battery according to claim 20.

22. A method for manufacturing a battery cell, characterized in that: include: Providing a housing assembly, the housing assembly including an electrode lead-out portion for inputting or outputting electrical energy; Providing an electrode assembly, the electrode assembly comprising a main body and an electrode ear portion protruding from the main body; providing a current collecting component; installing the electrode assembly in the housing assembly; connecting the current collecting component to the pole lug portion; connecting the electrode lead portion to the current collecting member; The pole lug portion includes a plurality of sub-pole lug portions, and the current collecting component has a plurality of avoidance areas, each of the avoidance areas being used for allowing at least a portion of one of the sub-pole lug portions to pass through, so that the sub-pole lug portion can be connected to a side of the current collecting component away from the main body portion; The current collecting component includes a first connecting portion and multiple second connecting portions, the first connecting portion is used to be connected to the electrode lead portion, the multiple second connecting portions are arranged at intervals on the first connecting portion along the circumference of the current collecting component, the second connecting portion has at least one avoidance area, and the second connecting portion is used to be connected to the sub-pole ear portion.

23. A battery cell manufacturing device, characterized in that: include: a first providing device, the first providing device being used to provide a housing assembly, the housing assembly comprising an electrode lead portion for inputting or outputting electrical energy; a second providing device, the second providing device being used to provide an electrode assembly, the electrode assembly comprising a main body and an electrode ear portion protruding from the main body; a third providing device, the third providing device being used to provide a current collecting member; a first assembling device, the first assembling device being used to install the electrode assembly in the housing assembly; a second assembling device, the second assembling device being used to connect the current collecting component to the pole lug portion; as well as a third assembling device, the third assembling device being used to connect the electrode lead portion to the current collecting member; The pole lug portion includes a plurality of sub-pole lug portions, and the current collecting component has a plurality of avoidance areas, each of the avoidance areas being used for allowing at least a portion of one of the sub-pole lug portions to pass through, so that the sub-pole lug portion can be connected to a side of the current collecting component away from the main body portion; The current collecting component includes a first connecting portion and multiple second connecting portions, the first connecting portion is used to be connected to the electrode lead portion, the multiple second connecting portions are arranged at intervals on the first connecting portion along the circumference of the current collecting component, the second connecting portion has at least one avoidance area, and the second connecting portion is used to be connected to the sub-pole ear portion.

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