Stacked electrode assembly, battery cell, battery and electrical device

Abstract

The present application provides a laminated electrode assembly, a battery cell, a battery and an electrical device, belonging to the field of battery technology. The laminated electrode assembly includes a first electrode sheet and a second electrode sheet with opposite polarities, and the first electrode sheet and the second electrode sheet are stacked along a first direction. The first electrode sheet includes a first coating area and a first blank area arranged along a second direction, and the first blank area includes a first connecting portion and a first pole ear portion. The first connecting portion connects the first coating area and the first pole ear portion. Along the third direction, the size of the first connecting portion is larger than the size of the first pole ear portion, and the first direction, the second direction and the third direction are perpendicular to each other. The first connecting portions of the plurality of first pole sheets are gathered at one end of the laminated electrode assembly in the second direction to form a first gathered area. The first pole ear portions of the plurality of first pole sheets are stacked and protrude from the first gathered area along the second direction. This laminated electrode assembly has a high current carrying performance, and the toughness and stability of the first pole ear portion are good.

Description

Technical Field

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

[0002] In recent years, new energy vehicles have developed by leaps and bounds. In the field of electric vehicles, power batteries play an irreplaceable and important role as the power source of electric vehicles. The battery consists of a box body and a plurality of battery cells contained in the box body. The battery cell is assembled into an electrode assembly (bare cell) by winding or laminating the positive electrode sheet, the negative electrode sheet and the isolation membrane, and then put into the shell, covered with the end cover, and finally injected with the electrolyte. However, with the continuous development of battery technology, higher requirements are also put forward for the cycle life and safety of battery use. However, the cycle life of the battery in the prior art is relatively short, and there are 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 laminated electrode assembly, a battery cell, a battery, and an electrical device, which can effectively reduce the potential safety hazards of the battery during later use.

[0004] In a first aspect, an embodiment of the present application provides a laminated electrode assembly, comprising a first electrode plate and a second electrode plate with opposite polarities, wherein the first electrode plate and the second electrode plate are stacked along a first direction; the first electrode plate comprises a first coating area and a first blank area arranged along a second direction, the first blank area comprises a first connecting portion and a first pole ear portion, the first connecting portion connects the first coating area and the first pole ear portion, and along a third direction, the size of the first connecting portion is larger than the size of the first pole ear portion, and the first direction, the second direction and the third direction are perpendicular to each other; wherein the first connecting portions of a plurality of the first electrode plates are gathered at one end of the laminated electrode assembly in the second direction to form a first gathering area, and the first pole ear portions of a plurality of the first electrode plates are stacked and protrude from the first gathering area along the second direction.

[0005] In the above technical solution, the first electrode sheet has a first coating area and a first blank area arranged along the second direction, and the first blank area forms a first connecting portion and a first pole ear portion that are interconnected. The first connecting portions of multiple first electrode sheets are gathered at one end of the laminated electrode assembly in the second direction, so that the first gathered area formed by the multiple first connecting portions can cover one end of the laminated electrode assembly, and the first pole ear portions of the multiple first electrode sheets are stacked and protrude from the first gathered area, so that the first pole ear portion can realize the input or output of electrical energy of the laminated electrode assembly through the first gathered area. The laminated electrode assembly adopting this structure can, on the one hand, effectively improve the overcurrent performance of the first blank area of the first electrode sheet to ensure the stability of the overcurrent, thereby helping to improve the performance of the laminated electrode assembly, and is conducive to alleviating the phenomenon of local temperature rise of the laminated electrode assembly due to insufficient overcurrent area. On the other hand, it can effectively improve the toughness and structural stability of the first pole ear portion to reduce the risk of the first pole ear portion breaking during production or use, thereby helping to improve the service life of the laminated electrode assembly.

[0006] In some embodiments, the laminated electrode assembly further includes an isolating member; the isolating member is disposed between the first pole piece and the second pole piece and is used to separate the first pole piece and the second pole piece, the isolating member covers the first coating area along the first direction, and the first connecting portion protrudes from the isolating member along the second direction.

[0007] In the above technical solution, the first connecting portion is protruded out of the isolating member along the second direction, that is, the first blank area of the first pole piece extends out of one end of the isolating member along the second direction. The laminated electrode assembly adopting this structure, on the one hand, facilitates the first connecting portions of multiple first pole pieces to be gathered at one end of the laminated electrode assembly in the second direction, which is convenient for manufacturing and production. On the other hand, it can realize stacking of multiple first pole pieces and then uniform cutting to form a first gathering area and multiple first pole ear portions arranged in a stacked manner, which is beneficial to improving the production efficiency of the laminated electrode assembly.

[0008] In some embodiments, the thickness of the first gathering area in the second direction is 2 mm-4 mm.

[0009] In the above technical solution, by setting the thickness of the first gathering area between 2mm and 4mm, on the one hand, it can effectively alleviate the risk of low structural strength and insufficient flow area between the first gathering area and the first pole ear due to the thickness of the first gathering area being too small; on the other hand, it can effectively alleviate the phenomenon of excessive space occupied by the laminated electrode assembly due to the thickness of the first gathering area being too large, which is beneficial to improving the energy density of the laminated electrode assembly.

[0010] In some embodiments, the second pole piece includes a second coating area and a second blank area arranged along the second direction; the second blank area includes a second connecting portion and a second pole ear portion, the second connecting portion is connected to the second coating area and the second pole ear portion, and along the third direction, the size of the second connecting portion is larger than the size of the second pole ear portion; wherein, the second connecting portions of multiple second pole pieces are gathered at one end of the laminated electrode assembly in the second direction away from the first gathering area to form a second gathering area, and the second pole ear portions of multiple second pole pieces are stacked and protrude from the second gathering area as a whole along the second direction.

[0011] In the above technical solution, the second connecting portions of the multiple second pole pieces are arranged to be gathered at one end of the laminated electrode assembly away from the first gathering area in the second direction, so that the second gathering area formed by the multiple second connecting portions covers one end of the laminated electrode assembly, and the second pole ear portions of the multiple second pole pieces are stacked and protrude from the second gathering area. The laminated electrode assembly adopting this structure can effectively improve the overcurrent performance of the second blank area of the second pole piece to ensure the stability of the overcurrent, and is conducive to improving the toughness and structural stability of the second pole ear portion, so as to reduce the risk of the second pole ear portion breaking during production or use, thereby helping to further improve the overall structural stability and use performance of the laminated electrode assembly.

[0012] In some embodiments, the second pole piece includes a second coating area and a second blank area arranged along the third direction; the second blank area includes a second connecting portion and a second pole ear portion, the second connecting portion is connected to the second coating area and the second pole ear portion, and along the second direction, the size of the second connecting portion is larger than the size of the second pole ear portion; wherein the second connecting portions of a plurality of second pole pieces are gathered at one end of the laminated electrode assembly in the third direction and form a second gathered area, and the second pole ear portions of a plurality of second pole pieces are stacked and protrude from the second gathered area along the third direction as a whole.

[0013] In the above technical solution, the second coating area and the second blank area of the second electrode sheet are arranged along the third direction so that the second gathering area is located at one end of the laminated electrode assembly in the third direction, thereby enabling the second gathering area and the multiple stacked second electrode ears to be arranged adjacent to the first gathering area, thereby facilitating the realization of various manufacturing structures of the laminated electrode assembly to meet different usage scenarios.

[0014] In a second aspect, an embodiment of the present application further provides a battery cell comprising a housing and the above-mentioned laminated electrode assembly; the laminated electrode assembly is accommodated in the housing.

[0015] In some embodiments, the battery cell further includes a first insulating member; the first insulating member covers the first retracted area, and the first insulating member is used to separate the first electrode ear portion and the shell.

[0016] In the above technical solution, a first insulating member is provided at one end of the laminated electrode assembly so that the first insulating member can cover the first gathering area. Thus, the first insulating member can insulate and isolate the first pole ear and the outer shell on the one hand to reduce the phenomenon of overlapping short circuit between the first pole ear and the outer shell. On the other hand, the first gathering area and the outer shell can be isolated, which is beneficial to improving the safety of the battery cell.

[0017] In some embodiments, along the first direction, the first connection portions of the plurality of first pole pieces converge from one side to the other side of the laminated electrode assembly to form a first slope in the first convergence area, and the first insulating member covers the first slope.

[0018] In the above technical solution, the first connecting portions of multiple first pole pieces are gathered toward one side of the laminated electrode assembly along the first direction to achieve the gathering of multiple first connecting portions at one end of the laminated electrode assembly, thereby forming a first gathering area, and a matching first insulating member is correspondingly covered on the first inclined surface of the first gathering area to achieve insulation isolation between the first pole ear and the outer shell and between the first gathering area and the outer shell. The battery cell with this structure is conducive to reducing the manufacturing difficulty of the first insulating member, thereby reducing manufacturing costs and improving production efficiency.

[0019] In some embodiments, along the first direction, the first connecting portions of the plurality of first pole pieces converge from both sides of the laminated electrode assembly toward the middle to form two second inclined surfaces in the first convergence area, and the first insulating member covers the two second inclined surfaces.

[0020] In the above technical solution, the first connecting portions of multiple first pole pieces are gathered toward the middle position of the laminated electrode assembly along the first direction to achieve the gathering of multiple first connecting portions at one end of the laminated electrode assembly, thereby forming a first gathering area, and the two second inclined surfaces of the first gathering area are correspondingly covered with matching first insulating members to achieve insulation isolation between the first pole ear portion and the outer shell and between the first gathering area and the outer shell. The battery cell with such a structure is conducive to reducing the manufacturing difficulty of the first gathering area and facilitating the electrical connection between the first pole ear portion and the electrode terminal on the outer shell.

[0021] In some embodiments, the first insulating member includes two first insulators; the two first insulators are respectively covered on the two second inclined surfaces, the two first insulators are arranged opposite to each other along the first direction and spliced together, and a first gap is formed between the two first insulators for the first pole ear to pass through.

[0022] In the above technical solution, by providing the first insulating member with two first insulators, each first insulator can cover a corresponding second inclined surface, thereby enabling the first insulating member to cover both second inclined surfaces, resulting in a simple structure and ease of implementation. Furthermore, by providing the two first insulators so as to be joined together along a first direction, with a first gap formed between the two first insulators for the first pole lug to pass through, the first insulating member employing this structure is easy to manufacture and assemble, and facilitates subsequent maintenance and replacement.

[0023] In a third aspect, an embodiment of the present application further provides a battery comprising at least one of the above-mentioned battery cells.

[0024] In a fourth aspect, an embodiment of the present application further provides an electrical device comprising the above-mentioned battery; the battery is used to provide electrical energy.

[0025] In the fifth aspect, an embodiment of the present application also provides a method for manufacturing a stacked electrode assembly, comprising: stacking a first electrode sheet and a second electrode sheet with opposite polarities along a first direction, the first electrode sheet comprising a first coating area and a first blank area arranged along a second direction, the second direction being perpendicular to the first direction; gathering and cutting the first blank areas of multiple first electrode sheets.

[0026] In the above technical solution, after the first electrode sheet and the second electrode sheet are stacked on each other, the first blank areas of the multiple first electrode sheets are gathered and then uniformly cut to form electrode ears for outputting or inputting electrical energy of the laminated electrode assembly, thereby eliminating the process of cutting a single first electrode sheet before stacking the first and second electrode sheets. This manufacturing method can, on the one hand, effectively reduce the phenomenon of misaligned overlap of multiple first electrode sheets, thereby improving the performance and safety performance of the laminated electrode assembly; on the other hand, it can greatly optimize the production rhythm of the laminated electrode assembly, which is conducive to improving the production efficiency of the laminated electrode assembly.

[0027] In some embodiments, gathering and cutting the first blank areas of the plurality of first pole pieces includes: gathering the first blank areas of the plurality of first pole pieces; welding the first blank areas of the plurality of first pole pieces to form a cutting portion; and cutting the cutting portion.

[0028] In the above technical solution, the multiple first blank areas after being folded are first welded into cutting parts, and then the cutting parts are uniformly cut. On the one hand, this manufacturing method facilitates the cutting of the cutting parts, which is beneficial to reducing the difficulty of cutting. On the other hand, it can effectively reduce the phenomenon of slippage or dislocation of the multiple first blank areas after being folded during the cutting process, which is beneficial to improve the cutting quality of the multiple first blank areas, so as to improve the production quality of the laminated electrode assembly.

[0029] In some embodiments, after the first blank areas of the plurality of first pole sheets are gathered and cut, the first blank areas form a first connecting portion and a first pole ear portion, the first connecting portion connects the first coating area and the first pole ear portion, and along the third direction, the size of the first connecting portion is larger than the size of the first pole ear portion, and the third direction is perpendicular to the first direction and the second direction; wherein, the first connecting portions of the plurality of first pole sheets are gathered at one end of the laminated electrode assembly in the second direction and form a first gathering area, and the first pole ear portions of the plurality of first pole sheets are stacked and protrude from the first gathering area along the second direction as a whole.

[0030] In the above technical solution, the first blank area after cutting forms a first connecting portion and a first pole ear portion that are connected to each other. The first connecting portions of multiple blank areas are gathered at one end of the laminated electrode assembly to form a first gathered area, and multiple first pole ears are stacked on each other and protrude from the first gathered area, so that the laminated electrode assembly formed has better current flow performance and higher structural stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0032] Figure 1 A schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0033] Figure 2 An exploded view of the structure of a battery provided in some embodiments of the present application;

[0034] Figure 3 An exploded view of the structure of a battery cell provided in some embodiments of the present application;

[0035] Figure 4 A cross-sectional view of a laminated electrode assembly provided in some embodiments of the present application;

[0036] Figure 5 A schematic structural diagram of a first pole piece provided in some embodiments of the present application;

[0037] Figure 6 A schematic structural diagram of a laminated electrode assembly provided in some embodiments of the present application;

[0038] Figure 7 A schematic structural diagram of a second pole piece provided in some embodiments of the present application;

[0039] Figure 8 A schematic structural diagram of a first folded area of a laminated electrode assembly provided in some embodiments of the present application;

[0040] Figure 9 A schematic diagram of the connection between the first gathering area and the first insulating member provided in some embodiments of the present application;

[0041] Figure 10 A schematic structural diagram of a first insulating member provided in some embodiments of the present application;

[0042] Figure 11 A schematic structural diagram of a first folded area of a laminated electrode assembly provided in some other embodiments of the present application;

[0043] Figure 12 A schematic diagram of the connection between the first gathering area and the first insulating member provided in some other embodiments of the present application;

[0044] Figure 13 An exploded view of the structure of a first insulating member provided in some other embodiments of the present application;

[0045] Figure 14 A schematic structural diagram of the second retracted region of a laminated electrode assembly provided in some embodiments of the present application;

[0046] Figure 15 A schematic diagram of the connection between the second gathering area and the second insulating member provided in some embodiments of the present application;

[0047] Figure 16 An exploded view of the structure of a second insulating member provided in some embodiments of the present application;

[0048] Figure 17 A schematic structural diagram of a second folded area of a laminated electrode assembly provided in some other embodiments of the present application;

[0049] Figure 18 A schematic diagram of the connection between the second gathering area and the second insulating member provided in some other embodiments of the present application;

[0050] Figure 19 A schematic structural diagram of a second insulating member provided in some further embodiments of the present application;

[0051] Figure 20 A schematic flow chart of a method for manufacturing a laminated electrode assembly according to some embodiments of the present application;

[0052] Figure 21 for Figure 20 FIG. 1 is a flow chart of step S200 of a method for manufacturing a laminated electrode assembly.

[0053] Icon: 1000-vehicle; 100-battery; 10-box; 11-first box body; 12-second box body; 20-battery cell; 21-housing; 211-shell; 2111-opening; 212-end cover; 22-laminated electrode assembly; 221-first pole piece; 2211-first coating area; 2212-first blank area; 2212a-first connecting portion; 2212b-first pole ear; 2212c-first gathered area; 2212d-first inclined surface; 2212e-second inclined surface; 222-second pole piece; 2221-second coating area; 2222-second blank area; 2222a-second connecting portion; 2222b-second pole ear; 2222c-second gathered area; 222 2d-third inclined plane; 2222e-fourth inclined plane; 223-isolating member; 23-positive electrode terminal; 24-negative electrode terminal; 25-pressure relief mechanism; 26-first insulating member; 261-first accommodating chamber; 262-first through hole; 263-first accommodating groove; 264-first gap; 265-first insulator; 2651-first docking hole; 2652-first docking block; 27-second insulating member; 271-second accommodating groove; 272-second gap; 273-second insulator; 2731-second docking hole; 2732-second docking block; 274-second accommodating chamber; 275-second through hole; 200-controller; 300-motor; X-first direction; Y-second direction; Z-third direction. DETAILED DESCRIPTION

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] The term "plurality" used in this application refers to two or more (including two).

[0061] 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.

[0062] 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.

[0063] A battery cell includes a shell, an electrode assembly, and an electrolyte. The shell is used to hold the electrode assembly and the electrolyte. The electrode assembly consists of a positive electrode sheet, a negative electrode sheet, and a separator. A battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode collector to form a coated area of the positive electrode sheet. The portion of the positive electrode collector that is not coated with the positive electrode active material layer forms a blank area of the positive electrode sheet. The blank area of the positive electrode sheet is cut as a positive electrode tab to realize the input or output of electrical energy to the positive electrode sheet through the positive electrode tab. Taking lithium-ion batteries as an example, the material of the positive electrode collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode current collector to form the coated area of the negative electrode sheet. The portion of the negative electrode current collector not coated with the negative electrode active material layer forms the blank area of the negative electrode sheet. After cutting, the blank area of the negative electrode sheet serves as the negative electrode tab, through which the negative electrode tab can realize the input or output of electrical energy of the negative electrode sheet. The material of the negative electrode current collector can be copper, and the negative electrode active material can be carbon or silicon, etc. To ensure that high current can pass without melting, there are multiple positive electrode tabs and they are stacked together, and there are multiple negative electrode tabs and they are stacked together.

[0064] In recent years, new energy vehicles have developed by leaps and bounds. In the field of electric vehicles, power batteries play an irreplaceable and important role as the power source of electric vehicles. The battery consists of a casing and multiple battery cells contained in the casing. The battery cell is assembled into an electrode assembly (bare cell) by winding or laminating the positive electrode sheet, the negative electrode sheet, and the separator. The electrode assembly is then placed in a casing, covered with end caps, and finally injected with electrolyte. However, with the continuous development of battery technology, higher requirements have been placed on the cycle life and safety of batteries. Therefore, the safety performance of the battery cell determines the safety of the battery during use.

[0065] The inventors have discovered that for a typical battery cell, the positive electrode sheet, negative electrode sheet, and separator of a laminated electrode assembly are typically stacked in sequence, and the separator is larger than the positive electrode sheet and negative electrode sheet so that the separator can completely cover the positive electrode sheet and negative electrode sheet. However, in a laminated electrode assembly of this structure, the positive electrode sheet and the negative electrode sheet need to be punched out of the positive electrode tab and the negative electrode tab, respectively, using a mold before being stacked with the separator. In other words, it is usually necessary to first cut the current collector of a single electrode sheet that is not coated with an active material layer to form a tab sheet with a width smaller than the width of the electrode sheet on one side of the coating area of the electrode sheet. Afterwards, multiple electrode sheets are stacked and arranged, and the tab sheets of the multiple electrode sheets are stacked along the thickness direction of the electrode sheet to form a tab for inputting or outputting electrical energy. However, the structural strength of the tabs of the laminated electrode assembly using this structure is relatively weak, which easily leads to the risk of the tabs breaking during assembly or later use, which is not conducive to improving the service life of the battery cell. In addition, the tabs of this structure have a small flow area, which leads to poor flow performance of the laminated electrode assembly, and easily causes the battery cell to experience local temperature rise due to insufficient flow, resulting in a major safety hazard in the later use of the battery cell.

[0066] Based on the above considerations, in order to solve the problem of significant safety hazards and short service life of battery cells during later use, the inventors, after in-depth research, designed a laminated electrode assembly, comprising a first pole piece and a second pole piece with opposite polarities, the first pole piece and the second pole piece being stacked along a first direction. The first pole piece comprises a first coating area and a first blank area arranged along a second direction, the first blank area comprising a first connecting portion and a first pole ear portion, the first connecting portion connecting the first coating area and the first pole ear portion, the size of the first connecting portion being larger than the size of the first pole ear portion along a third direction, and the first direction, the second direction and the third direction being perpendicular to each other. The first connecting portions of the plurality of first pole pieces are gathered at one end of the laminated electrode assembly in the second direction to form a first gathered area, the first pole ears of the plurality of first pole pieces are stacked and protrude from the first gathered area in the second direction.

[0067] In the above-mentioned laminated electrode assembly, the first connecting portions of multiple first pole pieces are gathered at one end of the laminated electrode assembly in the second direction, so that the first gathering area formed by the multiple first connecting portions can cover one end of the laminated electrode assembly, and the first pole ear portions of the multiple first pole pieces are stacked and protrude from the first gathering area, so that the first pole ear portions can realize the input or output of electrical energy of the laminated electrode assembly through the first gathering area. The laminated electrode assembly with this structure can, on the one hand, effectively improve the overcurrent performance of the first blank area of the first pole piece to ensure the stability of the overcurrent, thereby helping to improve the performance of the laminated electrode assembly, and help to alleviate the phenomenon of local temperature rise in the laminated electrode assembly due to insufficient overcurrent area. On the other hand, it can effectively improve the toughness and structural stability of the first pole ear portion to reduce the risk of the first pole ear portion breaking during production or use, thereby helping to improve the service life of the laminated electrode assembly.

[0068] In addition, in the laminated electrode assembly of this structure, since the first blank areas of the multiple first pole sheets are formed with a first folding area and a first pole ear portion protruding from the first folding area at one end of the laminated electrode assembly to realize the input or output of electrical energy to the laminated electrode assembly, in the process of producing the laminated electrode assembly of this structure, the first pole sheet and the second pole sheet can be stacked first, and then the first blank areas of the multiple first pole sheets can be folded and uniformly cut to form the first connecting portion and the first pole ear portion, so that there is no need to individually cut the first pole sheet before stacking the first pole sheet and the second pole sheet. On the one hand, it can effectively reduce the phenomenon of misalignment, overlap or folding of the first pole ears of the multiple first pole sheets, and on the other hand, it can greatly optimize the production rhythm of the laminated electrode assembly, which is beneficial to improving the production efficiency of the laminated electrode assembly.

[0069] The laminated electrode assembly disclosed in the embodiments of this application can be used, but is 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 construct such electrical devices. This effectively reduces the risk of localized temperature rise in the battery cells during later use, thereby improving battery safety.

[0070] 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.

[0071] 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.

[0072] Please refer to Figure 1 , Figure 1 A schematic structural diagram of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000. The battery 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000. For example, the battery 100 may serve as an operating power source for the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to power the motor 300, for example, to meet the power requirements for starting, navigating and driving the vehicle 1000.

[0073] 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.

[0074] Please refer to Figure 2 , Figure 2 An exploded view of the structure of the battery 100 provided in some embodiments of the present application. The battery 100 includes a case 10 and a battery cell 20, and the battery cell 20 is used to be accommodated in the case 10. The case 10 is used to provide an assembly space for the battery cell 20, and the case 10 can adopt a variety of structures. In some embodiments, the case 10 may include a first case body 11 and a second case body 12, and the first case body 11 and the second case body 12 cover each other, and the first case body 11 and the second case body 12 jointly define an assembly space for accommodating the battery cell 20. The second case body 12 can be a hollow structure with one end open, and the first case body 11 can be a plate-like structure, and the first case body 11 covers the open side of the second case body 12, so that the first case body 11 and the second case body 12 jointly define an assembly space; the first case body 11 and the second case body 12 can also be hollow structures with one side open, and the open side of the first case body 11 covers the open side of the second case body 12. Of course, the box body 10 formed by the first box body 11 and the second box body 12 can be in various shapes, such as a cylinder, a cuboid, etc.

[0075] 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.

[0076] Each battery cell 20 may be a secondary battery or a primary battery, and may also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be cylindrical, flat, rectangular, or in other shapes.

[0077] It should be noted that, in some embodiments, the battery 100 may not be provided with a box 10 , and the multiple battery cells 20 may be directly integrated into the vehicle 1000 , and the multiple battery cells 20 are used to provide electrical energy for the vehicle 1000 .

[0078] Please refer to Figure 3 , Figure 3 This is an exploded view of the structure of a battery cell 20 provided in some embodiments of the present application. The battery cell 20 includes a housing 21 and a laminated electrode assembly 22 , wherein the housing 21 is used to accommodate the laminated electrode assembly 22 .

[0079] The housing 21 can also be used to contain electrolyte, such as electrolyte. The housing 21 can be of various structural forms.

[0080] In some embodiments, the housing 21 may include a shell 211 and an end cover 212, wherein the shell 211 is a hollow structure with an opening 2111 on one side, and the end cover 212 covers the opening 2111 of the shell 211 and forms a sealed connection to form a sealed space for accommodating the laminated electrode assembly 22 and the electrolyte.

[0081] When assembling the battery cell 20 , the laminated electrode assembly 22 may be placed into the housing 211 , and the housing 211 may be filled with electrolyte. The end cap 212 may then be placed over the opening 2111 of the housing 211 .

[0082] 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 laminated electrode assembly 22. For example, if the laminated electrode assembly 22 is a cylindrical structure, a cylindrical shell can be selected; if the laminated electrode assembly 22 is a cuboid structure, a cuboid shell 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 an opening 2111 at one end, etc. For example, in Figure 3 In the embodiment, the shell 211 is a rectangular parallelepiped structure, the end cover 212 is a plate-shaped structure, and the end cover 212 covers the opening 2111 of the shell 211 .

[0083] In some embodiments, the battery cell 20 may further include a positive electrode terminal 23, a negative electrode terminal 24, and a pressure relief mechanism 25. The positive electrode terminal 23 and the pressure relief mechanism are both mounted on the end cap 212, and the negative electrode terminal 24 is mounted on the end of the housing 211 opposite the end cap 212. The positive electrode terminal 23 and the negative electrode terminal 24 are both used to electrically connect to the laminated electrode assembly 22 to enable the input and output of electrical energy to the battery cell 20. The pressure relief mechanism 25 is used to relieve the pressure inside the battery cell 20 when the internal pressure or temperature of the battery cell 20 reaches a predetermined value.

[0084] Exemplarily, the pressure relief mechanism 25 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.

[0085] It is understood that the housing 21 is not limited to the above structure and may also have other structures. For example, the housing 21 includes a shell 211 and two end caps 212. The shell 211 is a hollow structure with openings 2111 on opposite sides. One end cap 212 covers one opening 2111 of the shell 211 and forms a sealed connection to form a sealed space for accommodating the laminated electrode assembly 22 and the electrolyte. The positive electrode terminal 23 and the negative electrode terminal 24 are respectively mounted on the corresponding end caps 212. In this structure, the pressure relief mechanism 25 may be mounted on one end cap 212 or on both end caps 212.

[0086] It should be noted that, in the embodiment of the present application, the number of the laminated electrode assembly 22 contained in the housing 21 may be one or more. Figure 3 In the embodiment, there is one laminated electrode assembly 22. The laminated electrode assembly 22 is a component where electrochemical reactions occur in the battery cell 20. Figure 4 , Figure 4A cross-sectional view of a laminated electrode assembly 22 provided in some embodiments of the present application. The laminated electrode assembly 22 may include a first electrode piece 221 and a second electrode piece 222 of opposite polarity, the first electrode piece 221 and the second electrode piece 222 being stacked along a first direction X to form a laminated structure of the laminated electrode assembly 22.

[0087] According to some embodiments of the present application, referring to Figure 3 and Figure 4 , and please refer to Figure 5 , Figure 5 Schematic diagram of the structure of the first electrode piece 221 provided in some embodiments of the present application. The present application provides a laminated electrode assembly 22, which includes a first electrode piece 221 and a second electrode piece 222 of opposite polarity, and the first electrode piece 221 and the second electrode piece 222 are stacked along a first direction X. The first electrode piece 221 includes a first coated area 2211 and a first blank area 2212 arranged along a second direction Y. The first blank area 2212 includes a first connecting portion 2212a and a first pole ear portion 2212b. The first connecting portion 2212a connects the first coated area 2211 and the first pole ear portion 2212b. Along a third direction Z, the size of the first connecting portion 2212a is larger than the size of the first pole ear portion 2212b. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other. Among them, the first connecting parts 2212a of multiple first pole pieces 221 are gathered at one end of the laminated electrode assembly 22 in the second direction Y to form a first gathering area 2212c, and the first pole ear parts 2212b of multiple first pole pieces 221 are stacked and protrude from the first gathering area 2212c along the second direction Y.

[0088] In the above description, the first coating region 2211 and the first blank region 2212 are, respectively, the current collector region coated with the active material layer and the current collector region not coated with the active material layer of the first electrode sheet 221. The first connecting portion 2212a connects the first coating region 2211 and the first electrode ear portion 2212b. Along the third direction Z, the size of the first connecting portion 2212a is larger than the size of the first electrode ear portion 2212b. That is, the first connecting portion 2212a connects between the first coating region 2211 and the first electrode ear region along the second direction Y, and the width of the first connecting portion 2212a in the third direction Z is larger than the width of the first electrode ear portion 2212b.

[0089] For example, the first coating area 2211 and the first connecting portion 2212a have the same width in the third direction Z. The first electrode piece 221 adopting such a structure can, on the one hand, effectively improve the structural strength of the first connecting portion 2212a, and on the other hand, facilitate processing and manufacturing. The first connecting portion 2212a can be formed in the current collector area of the first electrode piece 221 that is not coated with the active material layer, so that during the processing and manufacturing of the first electrode piece 221, it is not necessary to perform other processing techniques on the first connecting portion 2212a, thereby effectively reducing the manufacturing difficulty of the first electrode piece 221 and facilitating improving the production efficiency of the first electrode piece 221.

[0090] It should be noted that, in this embodiment, the first electrode 221 can be a positive electrode or a negative electrode, and this embodiment of the application does not limit this.

[0091] The first electrode piece 221 has a first coating area 2211 and a first blank area 2212 arranged along the second direction Y, and the first blank area 2212 is formed with a first connecting portion 2212a and a first pole ear portion 2212b connected to each other. By folding the first connecting portions 2212a of the plurality of first electrode pieces 221 at one end of the laminated electrode assembly 22 in the second direction Y, so that the first folded area 2212c formed by the plurality of first connecting portions 2212a can cover one end of the laminated electrode assembly 22, and after the first pole ear portions 2212b of the plurality of first electrode pieces 221 are stacked, they protrude from the first folded area 2212c, so that the first pole ear portion 2212b can pass through The first gathering area 2212c realizes the input or output of electric energy of the laminated electrode assembly 22. The laminated electrode assembly 22 adopting this structure can, on the one hand, effectively improve the overcurrent performance of the first blank area 2212 of the first pole piece 221 to ensure the stability of the overcurrent, thereby helping to improve the performance of the laminated electrode assembly 22, and helping to alleviate the phenomenon of local temperature rise in the laminated electrode assembly 22 due to insufficient overcurrent area. On the other hand, it can effectively improve the toughness and structural stability of the first pole ear 2212b to reduce the risk of the first pole ear 2212b breaking during production or use, thereby helping to improve the service life of the laminated electrode assembly 22.

[0092] According to some embodiments of the present application, referring to Figure 4 and Figure 5 , and please refer to Figure 6 , Figure 6This is a schematic diagram of the structure of a laminated electrode assembly 22 provided in some embodiments of the present application. The laminated electrode assembly 22 also includes a separator 223. The separator 223 is disposed between the first electrode piece 221 and the second electrode piece 222 and is used to separate the first electrode piece 221 and the second electrode piece 222. The separator 223 covers the first coating area 2211 along the first direction X, and the first connecting portion 2212a protrudes from the separator 223 along the second direction Y.

[0093] The isolation member 223 is an isolation membrane, which is disposed between the first pole piece 221 and the second pole piece 222 to isolate the first pole piece 221 from the second pole piece 222 .

[0094] For example, the material of the spacer 223 may be PP (polypropylene) or PE (polyethylene).

[0095] By protruding the first connecting portion 2212a out of the isolation member 223 along the second direction Y, that is, the first blank area 2212 of the first pole piece 221 extends out of one end of the isolation member 223 along the second direction Y, the laminated electrode assembly 22 adopting this structure, on the one hand, facilitates the first connecting portions 2212a of multiple first pole pieces 221 to be gathered at one end of the laminated electrode assembly 22 in the second direction Y, which is convenient for manufacturing and production; on the other hand, it can realize stacking of multiple first pole pieces 221 and then uniform cutting to form a first gathering area 2212c and multiple first pole ear portions 2212b arranged in a stacked manner, which is beneficial to improving the production efficiency of the laminated electrode assembly 22.

[0096] According to some embodiments of the present application, see Figure 4 and Figure 6 As shown, the thickness of the first gathered area 2212c in the second direction Y is 2mm-4mm.

[0097] The thickness of the first gathered area 2212c in the second direction Y is 2mm-4mm, that is, the dimension of the first connection portions 2212a of the plurality of first pole pieces 221 protruding from one end of the isolation member 223 in the second direction Y after being gathered is 2mm-4mm. Figure 4 and Figure 6 It can be seen from the figure that the thickness of the first gathered area 2212c in the second direction Y is D1, which satisfies 2mm≤D1≤4mm.

[0098] By setting the thickness of the first gathering area 2212c between 2mm and 4mm, on the one hand, it can effectively alleviate the risk of low structural strength and insufficient flow area between the first gathering area 2212c and the first pole ear portion 2212b due to the thickness of the first gathering area 2212c being too small. On the other hand, it can effectively alleviate the phenomenon of excessive space occupied by the laminated electrode assembly 22 due to the thickness of the first gathering area 2212c being too large, which is beneficial to improving the energy density of the laminated electrode assembly 22.

[0099] According to some embodiments of the present application, referring to Figure 4 and Figure 6 , and please refer to Figure 7 , Figure 7 This is a schematic structural diagram of a second electrode piece 222 provided in some embodiments of the present application. The second electrode piece 222 includes a second coated area 2221 and a second blank area 2222 arranged along a second direction Y. The second blank area 2222 includes a second connecting portion 2222a and a second electrode ear portion 2222b. The second connecting portion 2222a is connected to the second coated area 2221 and the second electrode ear portion 2222b. Along the third direction Z, the size of the second connecting portion 2222a is larger than the size of the second electrode ear portion 2222b. The second connecting portions 2222a of the plurality of second electrode pieces 222 are gathered together at one end of the laminated electrode assembly 22 in the second direction Y, facing away from the first gathered area 2212c, to form a second gathered area 2222c. The second electrode ear portions 2222b of the plurality of second electrode pieces 222 are stacked and protrude from the second gathered area 2222c as a whole along the second direction Y.

[0100] In the above description, the second coating region 2221 and the second blank region 2222 are, respectively, the current collector region coated with the active material layer and the current collector region not coated with the active material layer of the second electrode sheet 222. The second connecting portion 2222a connects the second coating region 2221 and the second electrode ear portion 2222b. Along the third direction Z, the size of the second connecting portion 2222a is larger than the size of the second electrode ear portion 2222b. That is, the second connecting portion 2222a is connected between the second coating region 2221 and the second electrode ear region along the second direction Y, and the width of the second connecting portion 2222a in the third direction Z is larger than the width of the second electrode ear portion 2222b.

[0101] The width of the second coating area 2221 and the second connecting portion 2222 a in the third direction Z are the same.

[0102] For example, in Figure 4 In the embodiment, the first electrode 221 is a negative electrode, and the second electrode 222 is a positive electrode. Of course, in other embodiments, the first electrode 221 can also be a positive electrode, and the second electrode 222 can be a negative electrode.

[0103] Optionally, along the second direction Y, the second gathered area 2222c protrudes from one end of the isolation member 223 by 2mm-4mm. Figure 4 and Figure 6 It can be seen from the figure that the thickness of the second gathering area 2222c in the second direction Y is D2, which satisfies 2mm≤D2≤4mm.

[0104] By setting the second connection portions 2222a of the multiple second pole pieces 222 to be folded at one end of the laminated electrode assembly 22 away from the first folding area 2212c in the second direction Y, so that the second folding area 2222c formed by the multiple second connection portions 2222a covers one end of the laminated electrode assembly 22, and the second pole ear portions 2222b of the multiple second pole pieces 222 are stacked to protrude from the second folding area 2222c, the laminated electrode assembly 22 adopting this structure can effectively improve the overcurrent performance of the second blank area 2222 of the second pole piece 222 to ensure the stability of the overcurrent, and is conducive to improving the toughness and structural stability of the second pole ear portion 2222b, so as to reduce the risk of the second pole ear portion 2222b breaking during production or use, thereby helping to further improve the overall structural stability and use performance of the laminated electrode assembly 22.

[0105] It should be noted that in Figure 4 In the embodiment, the first gathered area 2212c and the second gathered area 2222c are respectively located at the two ends of the laminated electrode assembly 22 in the second direction Y. Of course, the structure of the laminated electrode assembly 22 is not limited thereto. In other embodiments, the second gathered area 2222c may also form an end adjacent to the first gathered area 2212c. For example, the second electrode sheet 222 includes a second coated area 2221 and a second blank area 2222 arranged along the third direction Z. The second blank area 2222 includes a second connecting portion 2222a and a second pole ear portion 2222b. The second connecting portion 2222a is connected to the second coated area 2221 and the second pole ear portion 2222b. Along the second direction Y, the size of the second connecting portion 2222a is larger than the size of the second pole ear portion 2222b. Among them, the second connecting parts 2222a of the multiple second pole pieces 222 are gathered at one end of the laminated electrode assembly 22 in the third direction Z to form a second gathering area 2222c, and the second pole ear parts 2222b of the multiple second pole pieces 222 are stacked and protrude from the second gathering area 2222c along the third direction Z as a whole.

[0106] By arranging the second coating area 2221 and the second blank area 2222 of the second electrode sheet 222 along the third direction Z, so that the second gathering area 2222c is located at one end of the laminated electrode assembly 22 in the third direction Z, the second gathering area 2222c and the multiple stacked second electrode ears 2222b can be arranged adjacent to the first gathering area 2212c, which is conducive to realizing a variety of manufacturing structures of the laminated electrode assembly 22 to meet different usage scenarios.

[0107] According to some embodiments of the present application, the present application further provides a battery cell 20 , comprising a housing 21 and a laminated electrode assembly 22 of any of the above solutions, wherein the laminated electrode assembly 22 is accommodated in the housing 21 .

[0108] According to some embodiments of the present application, see Figure 3 and Figure 4 The battery cell 20 further includes a first insulating member 26 . The first insulating member 26 covers the first gathering area 2212 c . The first insulating member 26 is used to separate the first pole ear portion 2212 b and the housing 21 .

[0109] The first insulating member 26 covers the first gathered area 2212 c and allows the stacked first tabs 2212 b to pass through, so that the first tabs 2212 b can be connected to the positive electrode terminal 23 or the negative electrode terminal 24 of the battery cell 20 .

[0110] For example, the first insulating member 26 may be made of rubber, plastic, or silicone.

[0111] By arranging a first insulating member 26 at one end of the laminated electrode assembly 22, the first insulating member 26 can cover the first gathering area 2212c, so that the first insulating member 26 can insulate and isolate the first pole ear portion 2212b and the outer shell 21 on the one hand, so as to reduce the phenomenon of overlapping short circuit between the first pole ear portion 2212b and the outer shell 21, and on the other hand, it can also achieve isolation between the first gathering area 2212c and the outer shell 21, which is beneficial to improve the safety of the battery cell 20.

[0112] According to some embodiments of the present application, referring to Figure 4 , and please refer to Figure 8 、 Figure 9 and Figure 10 , Figure 8 This is a schematic structural diagram of the first gathered area 2212c of the laminated electrode assembly 22 provided in some embodiments of the present application. Figure 9 This is a schematic diagram of the connection between the first gathering area 2212c and the first insulating member 26 provided in some embodiments of the present application. Figure 10Schematic diagram of the structure of the first insulating member 26 provided in some embodiments of the present application. Along the first direction X, the first connecting portions 2212a of the plurality of first electrode sheets 221 converge from one side to the other side of the laminated electrode assembly 22 to form a first inclined surface 2212d in the first converged area 2212c. The first insulating member 26 covers the first inclined surface 2212d.

[0113] In the above description, along the first direction X, the first connection portions 2212a of the multiple first pole pieces 221 are gathered from one side to the other side of the laminated electrode assembly 22, that is, the first connection portions 2212a of the multiple first pole pieces 221 are tilted from one side to the other side of the laminated electrode assembly 22 along the first direction X, thereby forming a first gathering area 2212c having a first inclined surface 2212d, and making the first connection portion 2212a located on one side of the first gathering area 2212c in the first direction X.

[0114] The lower surface of the first insulating member 26 in the second direction Y is aligned with the first inclined surface 2212 d , so that the first insulating member 26 can cover the first inclined surface 2212 d .

[0115] Optionally, a first accommodating cavity 261 is formed inside the first insulating member 26, and the first accommodating cavity 261 passes through the side of the first insulating member 26 close to the first pole ear portion 2212b along the first direction X, so that the first pole ear portion 2212b can be inserted into the first accommodating cavity 261, wherein the first insulating member 26 is also provided with a first through hole 262 for the positive electrode terminal 23 or the negative electrode terminal 24 to pass through on the side away from the first inclined surface 2212d in the second direction Y, and the first through hole 262 is connected to the first accommodating cavity 261, so that the first pole ear portion 2212b can be connected to the positive electrode terminal 23 or the negative electrode terminal 24, thereby realizing the input or output of electrical energy of the laminated electrode assembly 22.

[0116] By folding the first connecting portions 2212a of the multiple first pole pieces 221 toward one side of the laminated electrode assembly 22 along the first direction X, the multiple first connecting portions 2212a are folded at one end of the laminated electrode assembly 22, thereby forming a first folding area 2212c, and correspondingly covering the first inclined surface 2212d of the first folding area 2212c with a matching first insulating member 26 to achieve insulation isolation between the first pole ear portion 2212b and the outer shell 21 and between the first folding area 2212c and the outer shell 21. The battery cell 20 with this structure is conducive to reducing the manufacturing difficulty of the first insulating member 26, thereby reducing manufacturing costs and improving production efficiency.

[0117] According to some embodiments of this application, please refer to Figure 11 and Figure 12 , Figure 11This is a structural diagram of the first gathered area 2212c of the laminated electrode assembly 22 provided in some other embodiments of the present application. Figure 12 Schematic diagrams illustrating the connection between the first gathered region 2212c and the first insulating member 26 provided in further embodiments of the present application. Along the first direction X, the first connecting portions 2212a of the plurality of first electrode sheets 221 converge from both sides toward the center of the laminated electrode assembly 22 to form two second inclined surfaces 2212e in the first gathered region 2212c. The first insulating member 26 covers the two second inclined surfaces 2212e.

[0118] In the above description, along the first direction X, the first connection portions 2212a of the multiple first pole pieces 221 are converged from both sides of the laminated electrode assembly 22 to the middle, that is, the first connection portions 2212a of the multiple first pole pieces 221 are inclined from both sides of the laminated electrode assembly 22 to the middle position along the first direction X, thereby forming a first convergence area 2212c with two second inclined surfaces 2212e, and making the first connection portion 2212a located in the middle position of the first convergence area 2212c in the first direction X.

[0119] The lower surface of the first insulating member 26 in the second direction Y is aligned with the two second inclined surfaces 2212 e , so that the first insulating member 26 can cover the two second inclined surfaces 2212 e .

[0120] Optionally, the first insulating member 26 is provided with a first accommodating groove 263 on the side away from the second inclined surface 2212e in the second direction Y, and the bottom wall of the first accommodating groove 263 is provided with a first gap 264 that passes through the lower surface of the first insulating member 26, so that the first pole ear portion 2212b can pass through the first gap 264 and be arranged in the first accommodating groove 263, so that the first pole ear portion 2212b can be connected to the positive electrode terminal 23 or the negative electrode terminal 24 to realize the input or output of electrical energy of the laminated electrode assembly 22.

[0121] By gathering the first connecting portions 2212a of the multiple first pole pieces 221 toward the middle position of the laminated electrode assembly 22 along the first direction X, so as to achieve the gathering of the multiple first connecting portions 2212a at one end of the laminated electrode assembly 22, thereby forming a first gathering area 2212c, and correspondingly covering the two second inclined surfaces 2212e of the first gathering area 2212c with matching first insulating members 26 to achieve insulation isolation between the first pole ear portion 2212b and the outer shell 21, and between the first gathering area 2212c and the outer shell 21. The battery cell 20 with such a structure is conducive to reducing the manufacturing difficulty of the first gathering area 2212c, and facilitates the electrical connection between the first pole ear portion 2212b and the electrode terminal on the outer shell 21.

[0122] According to some embodiments of the present application, referring to Figure 13 , Figure 13 The first insulating member 26 is provided in an exploded view of another embodiment of the present application. The first insulating member 26 includes two first insulators 265. The two first insulators 265 cover the two second inclined surfaces 2212e, respectively. The two first insulators 265 are arranged opposite each other along the first direction X and are spliced together. A first gap 264 is formed between the two first insulators 265 for the first terminal ear 2212b to pass through.

[0123] Illustratively, two first insulators 265 are arranged opposite each other along a first direction X. A first docking hole 2651 and a first docking block 2652 are defined on one side of each first insulator 265 in the first direction X. The first docking holes 2651 and the first docking blocks 2652 are spaced apart along a third direction Z. The first docking block 2652 of one first insulator 265 is inserted into the first docking hole 2651 of the other first insulator 265 to achieve splicing of the two first insulators 265. Of course, in other embodiments, the two first insulators 265 may also be detachably connected using bolts or other methods.

[0124] By configuring the first insulating member 26 as two first insulators 265, each first insulator 265 can cover a corresponding second inclined surface 2212e, thereby enabling the first insulating member 26 to cover both second inclined surfaces 2212e. This simplifies the structure and facilitates implementation. Furthermore, by configuring the two first insulators 265 to be joined together along the first direction X, with a first gap 264 formed between the two first insulators 265 for the first pole ear 2212b to pass through, the first insulating member 26 employing this structure is easy to manufacture and assemble, and facilitates subsequent maintenance and replacement.

[0125] According to some embodiments of the present application, in an embodiment in which the second electrode sheet 222 also has a second gathered area 2222c formed at one end of the laminated electrode assembly 22, Figure 3 and Figure 4 , and please refer to Figure 14 、 Figure 15 and Figure 16 , Figure 14 This is a schematic structural diagram of the second gathered area 2222c of the laminated electrode assembly 22 provided in some embodiments of the present application. Figure 15 This is a schematic diagram of the connection between the second gathering area 2222c and the second insulating member 27 provided in some embodiments of the present application. Figure 16 The battery cell 20 may further include a second insulating member 27 , which covers the second gathered area 2222 c and is used to separate the second tab portion 2222 b from the housing 21 .

[0126] In some embodiments, along the first direction X, the second connection portions 2222a of the plurality of second pole pieces 222 converge from both sides of the laminated electrode assembly 22 toward the middle to form two third inclined surfaces 2222d in the second convergent area 2222c, and the second insulating member 27 covers the two third inclined surfaces 2222d.

[0127] In the above description, along the first direction X, the second connection portions 2222a of the multiple second pole pieces 222 are converged from both sides of the laminated electrode assembly 22 to the middle, that is, the second connection portions 2222a of the multiple second pole pieces 222 are inclined from both sides of the laminated electrode assembly 22 to the middle position along the first direction X, thereby forming a second convergence area 2222c with two third inclined surfaces 2222d, and making the second connection portion 2222a located in the middle position of the second convergence area 2222c in the first direction X.

[0128] The lower surface of the second insulating member 27 in the second direction Y is aligned with the two third inclined surfaces 2222 d , so that the second insulating member 27 can cover the two third inclined surfaces 2222 d .

[0129] Optionally, the second insulating member 27 is provided with a second accommodating groove 271 on the side away from the third inclined surface 2222d in the second direction Y, and the bottom wall of the second accommodating groove 271 is provided with a second gap 272 that passes through the lower surface of the second insulating member 27, so that the second pole ear portion 2222b can pass through the second gap 272 and be arranged in the second accommodating groove 271, so that the second pole ear portion 2222b can be connected to the positive electrode terminal 23 or the negative electrode terminal 24 to realize the input or output of electrical energy of the laminated electrode assembly 22.

[0130] By gathering the second connection portions 2222a of the multiple second pole pieces 222 toward the middle position of the laminated electrode assembly 22 along the first direction X, so as to realize that the multiple second connection portions 2222a are gathered at one end of the laminated electrode assembly 22, thereby forming a second gathering area 2222c, and correspondingly covering the two third inclined surfaces 2222d of the second gathering area 2222c with matching second insulating members 27 to realize insulation isolation between the second pole ear portion 2222b and the outer shell 21, and between the second gathering area 2222c and the outer shell 21. The battery cell 20 adopting this structure is conducive to reducing the manufacturing difficulty of the second gathering area 2222c, and facilitates the electrical connection between the second pole ear portion 2222b and the electrode terminal on the outer shell 21.

[0131] According to some embodiments of the present application, see Figure 16As shown, the second insulating member 27 includes two second insulators 273. The two second insulators 273 respectively cover the two third inclined surfaces 2222d. The two second insulators 273 are arranged opposite to each other along the first direction X and spliced together. A second gap 272 is formed between the two second insulators 273 for the second pole ear portion 2222b to pass through.

[0132] Illustratively, two second insulators 273 are arranged opposite each other along the first direction X. A second docking hole 2731 and a second docking block 2732 are defined on one side of the second insulator 273 in the first direction X. The second docking holes 2731 and the second docking blocks 2732 are spaced apart along the third direction Z. The second docking block 2732 of one second insulator 273 is inserted into the second docking hole 2731 of the other second insulator 273 to achieve splicing of the two second insulators 273. Of course, in other embodiments, the two second insulators 273 may also be detachably connected using bolts or other methods.

[0133] By configuring the second insulating member 27 as two second insulators 273, each second insulator 273 can cover a corresponding third inclined surface 2222d, thereby enabling the second insulating member 27 to cover both third inclined surfaces 2222d. This simplifies the structure and facilitates implementation. Furthermore, by configuring the two second insulators 273 to be joined together along the first direction X, with a second gap 272 formed between the two second insulators 273 for the second pole ear 2222b to pass through, the second insulating member 27 employing this structure is easy to manufacture and assemble, and facilitates subsequent maintenance and replacement.

[0134] According to some embodiments of this application, please refer to Figure 17 、 Figure 18 and Figure 19 , Figure 17 This is a structural diagram of the second gathered area 2222c of the laminated electrode assembly 22 provided in some other embodiments of the present application. Figure 18 This is a schematic diagram of the connection between the second gathering area 2222c and the second insulating member 27 provided in some embodiments of the present application. Figure 19 Schematic diagrams of the structure of the second insulating member 27 provided in some further embodiments of the present application. Along the first direction X, the second connecting portions 2222a of the plurality of second electrode sheets 222 converge from one side to the other side of the laminated electrode assembly 22 to form a fourth inclined surface 2222e in the second converged region 2222c. The second insulating member 27 covers the fourth inclined surface 2222e.

[0135] In the above description, along the first direction X, the second connection portions 2222a of the multiple second pole pieces 222 converge from one side of the laminated electrode assembly 22 to the other side, that is, the second connection portions 2222a of the multiple second pole pieces 222 are inclined from one side of the laminated electrode assembly 22 to the other side along the first direction X, thereby forming a second convergence area 2222c having a fourth inclined surface 2222e, and making the second connection portion 2222a located on one side of the second convergence area 2222c in the first direction X.

[0136] The lower surface of the second insulating member 27 in the second direction Y is aligned with the fourth inclined surface 2222 e , so that the second insulating member 27 can cover the fourth inclined surface 2222 e .

[0137] Optionally, a second accommodating cavity 274 is formed inside the second insulating member 27, and the second accommodating cavity 274 passes through the side of the second insulating member 27 close to the second pole ear portion 2222b along the first direction X, so that the second pole ear portion 2222b can be inserted into the second accommodating cavity 274, wherein the second insulating member 27 is also provided with a second through hole 275 for the positive electrode terminal 23 or the negative electrode terminal 24 to pass through on the side away from the fourth inclined surface 2222e in the second direction Y, and the second through hole 275 is connected to the second accommodating cavity 274, so that the second pole ear portion 2222b can be connected to the positive electrode terminal 23 or the negative electrode terminal 24, thereby realizing the input or output of electrical energy of the laminated electrode assembly 22.

[0138] By gathering the second connection portions 2222a of the multiple second pole pieces 222 toward one side of the laminated electrode assembly 22 along the first direction X, so as to achieve the gathering of the multiple second connection portions 2222a at one end of the laminated electrode assembly 22, thereby forming a second gathering area 2222c, and correspondingly covering the fourth inclined surface 2222e of the second gathering area 2222c with a matching second insulating member 27 to achieve insulation isolation between the second pole ear portion 2222b and the outer shell 21 and between the second gathering area 2222c and the outer shell 21. The battery cell 20 with such a structure is conducive to reducing the manufacturing difficulty of the second insulating member 27, thereby reducing manufacturing costs and improving production efficiency.

[0139] According to some embodiments of the present application, the present application further provides a battery 100 including at least one battery cell 20 according to any of the above solutions.

[0140] For example, there may be one or more battery cells 20 .

[0141] 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.

[0142] The power-consuming device may be any of the aforementioned devices or systems using the battery 100 .

[0143] According to some embodiments of the present application, see Figure 3-Figure 7 As shown, the present application provides a laminated electrode assembly 22, which includes a first electrode piece 221, a separator 223, and a second electrode piece 222 stacked along a first direction X. The separator 223 is disposed between the first electrode piece 221 and the second electrode piece 222. The first electrode piece 221 includes a first coated area 2211 and a first blank area 2212 arranged along a second direction Y. The first blank area 2212 includes a first connecting portion 2212a and a first pole ear portion 2212b. The first connecting portion 2212a connects the first coated area 2211 and the first pole ear portion 2212b. Along a third direction Z, the size of the first connecting portion 2212a is larger than the size of the first pole ear portion 2212b. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other. The first connecting portions 2212a of the plurality of first electrode sheets 221 are gathered at one end of the laminated electrode assembly 22 in the second direction Y, forming a first gathered region 2212c. The first electrode lug portions 2212b of the plurality of first electrode sheets 221 are stacked and protrude from the first gathered region 2212c in the second direction Y. The second electrode sheet 222 includes a second coated region 2221 and a second blank region 2222 arranged in the second direction Y. The second blank region 2222 includes a second connecting portion 2222a and a second electrode lug portion 2222b. The second connecting portion 2222a is connected to the second coated region 2221 and the second electrode lug portion 2222b. Along the third direction Z, the second connecting portion 2222a is larger than the second electrode lug portion 2222b. The second connecting portions 2222a of the plurality of second electrode sheets 222 are gathered at one end of the laminated electrode assembly 22 in the second direction Y, away from the first gathered region 2212c, to form a second gathered region 2222c. The second electrode tabs 2222b of the plurality of second electrode sheets 222 are stacked and project out of the second gathered region 2222c as a whole along the second direction Y. The first gathered region 2212c and the second gathered region 2222c respectively project out of the ends of the separator 223 along the second direction Y. The thickness of the first gathered region 2212c and the second gathered region 2222c are both 2 mm to 4 mm.

[0144] The present application also provides a method for manufacturing a laminated electrode assembly 22. Figure 20 , Figure 20 A schematic flow chart of a method for manufacturing a laminated electrode assembly 22 provided in some embodiments of the present application. The manufacturing method includes:

[0145] S100: stacking a first electrode piece 221 and a second electrode piece 222 with opposite polarities along a first direction X, wherein the first electrode piece 221 includes a first coating area 2211 and a first blank area 2212 arranged along a second direction Y, wherein the second direction Y is perpendicular to the first direction X;

[0146] S200 : folding and cutting the first blank areas 2212 of the plurality of first pole pieces 221 .

[0147] The first electrode 221 is a negative electrode, and the second electrode 222 is a positive electrode. Of course, in some embodiments, the first electrode 221 may also be a positive electrode, and correspondingly, the second electrode 222 is a negative electrode.

[0148] Optionally, in step S200 , after the first blank areas 2212 of the plurality of first electrode sheets 221 are gathered and cut, the first blank areas 2212 form a first connecting portion 2212a and a first electrode lug portion 2212b. The first connecting portion 2212a connects the first coated area 2211 and the first electrode lug portion 2212b. Along the third direction Z, the first connecting portion 2212a is larger than the first electrode lug portion 2212b. The third direction Z is perpendicular to the first direction X and the second direction Y. The first connecting portions 2212a of the plurality of first electrode sheets 221 are gathered at one end of the laminated electrode assembly 22 in the second direction Y to form a first gathered area 2212c. The first electrode lug portions 2212b of the plurality of first electrode sheets 221 are stacked and protrude from the first gathered area 2212c as a whole along the second direction Y.

[0149] It should be noted that the second pole piece 222 may also be manufactured using the same manufacturing method as the first pole piece 221 .

[0150] In the above-mentioned manufacturing method, after the first electrode piece 221 and the second electrode piece 222 are stacked on each other, the first blank areas 2212 of the multiple first electrode pieces 221 are gathered and then the first blank areas 2212 of the multiple first electrode pieces 221 are uniformly cut to form an ear for outputting or inputting electrical energy of the laminated electrode assembly 22, thereby eliminating the process of cutting a single first electrode piece 221 before stacking the first electrode piece 221 and the second electrode piece 222. This manufacturing method can, on the one hand, effectively reduce the phenomenon of misaligned overlap of the multiple first electrode pieces 221, so as to improve the performance and safety performance of the laminated electrode assembly 22; on the other hand, it can greatly optimize the production rhythm of the laminated electrode assembly 22, which is beneficial to improving the production efficiency of the laminated electrode assembly 22.

[0151] In some embodiments, please refer to Figure 21 , Figure 21 for Figure 20The process diagram of step S200 of the manufacturing method of the laminated electrode assembly 22 is shown. Step S200: gather and cut the first blank areas 2212 of the plurality of first electrode sheets 221, including:

[0152] S210: folding the first blank areas 2212 of the plurality of first pole pieces 221;

[0153] S220: welding the first blank areas 2212 of the plurality of first pole pieces 221 to form cutting portions;

[0154] S230: Cutting the cutting part.

[0155] In the manufacturing method, the multiple first blank areas 2212 that are gathered are first welded into cutting parts, and then the cutting parts are uniformly cut. On the one hand, this manufacturing method facilitates the cutting of the cutting parts, which helps to reduce the difficulty of cutting. On the other hand, it can effectively reduce the phenomenon of slippage or dislocation of the multiple first blank areas 2212 that are gathered during the cutting process, thereby helping to improve the cutting quality of the multiple first blank areas 2212, so as to improve the production quality of the laminated electrode assembly 22.

[0156] Optionally, the device for cutting the cut portion may be a laser cutting device or a die cutting device.

[0157] Exemplarily, the laser cutting device includes a laser cutting gun and a mold. The mold is used to place the laminated electrode assembly 22, and the laser cutting gun is used to cut the laminated electrode assembly 22 along the trajectory of the mold. The specific structure of the laser cutting device can be found in the relevant art and will not be described here.

[0158] Exemplarily, the die cutting device includes a punching knife and a punching machine, wherein the punching knife is connected to the punching machine, and the punching machine is used to drive the punching knife to punch the laminated electrode assembly 22. The specific structure of the die cutting device can be found in the relevant art and will not be described here in detail.

[0159] It should be noted that the relevant structures of the laminated electrode assembly 22 manufactured by the manufacturing methods provided in the above embodiments can be referred to the laminated electrode assembly 22 provided in the above embodiments, and will not be described in detail here.

[0160] 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.

[0161] 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: The invention comprises a housing and a laminated electrode assembly, wherein the laminated electrode assembly is accommodated in the housing, and the laminated electrode assembly comprises a first pole piece and a second pole piece with opposite polarities, wherein the first pole piece and the second pole piece are stacked along a first direction; The first pole piece includes a first coating area and a first blank area arranged along the second direction, the first coating area and the first blank area are respectively a current collector area of the first pole piece coated with an active material layer and a current collector area not coated with an active material layer, the first blank area includes a first connecting portion and a first pole ear portion, the first connecting portion connects the first coating area and the first pole ear portion, along the third direction, the size of the first connecting portion is larger than the size of the first pole ear portion, and the first direction, the second direction and the third direction are perpendicular to each other; Among them, the first blank areas of multiple first pole sheets are gathered and welded to form a cutting portion, and the cutting portion is uniformly cut to form the first connecting portion and the first pole ear portion, and the first connecting portions of multiple first pole sheets are gathered at one end of the stacked electrode assembly in the second direction to form a first gathering area, and the first pole ear portions of multiple first pole sheets are stacked and protrude from the first gathering area along the second direction, and the thickness of the first gathering area in the second direction is 2mm-4mm.

2. The battery cell according to claim 1, wherein: The laminated electrode assembly further comprises: An isolating member is disposed between the first pole piece and the second pole piece and is used to separate the first pole piece and the second pole piece. The isolating member covers the first coating area along the first direction, and the first connecting portion protrudes from the isolating member along the second direction.

3. The battery cell according to claim 1 or 2, characterized in that: The second pole piece includes a second coating area and a second blank area arranged along the second direction; The second blank area includes a second connecting portion and a second pole ear portion, the second connecting portion is connected to the second coating area and the second pole ear portion, and along the third direction, the size of the second connecting portion is larger than the size of the second pole ear portion; Among them, the second connecting portions of multiple second pole pieces are gathered at one end of the laminated electrode assembly away from the first gathering area in the second direction to form a second gathering area, and the second pole ear portions of multiple second pole pieces are stacked and protrude from the second gathering area along the second direction as a whole.

4. The battery cell according to claim 1 or 2, characterized in that: The second pole piece includes a second coating area and a second blank area arranged along the third direction; The second blank area includes a second connecting portion and a second pole ear portion, the second connecting portion is connected to the second coating area and the second pole ear portion, and along the second direction, the size of the second connecting portion is larger than the size of the second pole ear portion; Among them, the second connecting parts of multiple second pole pieces are gathered at one end of the laminated electrode assembly in the third direction to form a second gathering area, and the second pole ear parts of multiple second pole pieces are stacked and protrude from the second gathering area along the third direction as a whole.

5. The battery cell according to claim 1, characterized in that The battery cell further comprises: A first insulating member covers the first gathering area, and the first insulating member is used to separate the first pole ear portion and the shell.

6. The battery cell according to claim 5, characterized in that Along the first direction, the first connection portions of the plurality of first pole pieces converge from one side to the other side of the laminated electrode assembly to form a first inclined surface in the first converged area, and the first insulating member covers the first inclined surface.

7. The battery cell according to claim 5, characterized in that Along the first direction, the first connection portions of the plurality of first pole pieces converge from both sides of the laminated electrode assembly toward the middle to form two second inclined surfaces in the first converged area, and the first insulating member covers the two second inclined surfaces.

8. The battery cell according to claim 7, characterized in that The first insulating member comprises: Two first insulators are respectively covered on the two second inclined surfaces. The two first insulators are arranged opposite to each other along the first direction and spliced together. A first gap is formed between the two first insulators for the first pole ear to pass through.

9. A battery, characterized in that: The battery comprises at least one battery cell according to any one of claims 1 to 8.

10. An electrical device, characterized in that: The battery according to claim 9 is included for providing electrical energy.

11. A method for manufacturing a battery cell, wherein the battery cell comprises a housing and a laminated electrode assembly, wherein the housing is used to accommodate the laminated electrode assembly, and the laminated electrode assembly comprises a first electrode sheet and a second electrode sheet with opposite polarities, wherein: include: stacking a first pole piece and a second pole piece with opposite polarities along a first direction, wherein the first pole piece includes a first coating area and a first blank area arranged along a second direction, wherein the second direction is perpendicular to the first direction; Gathering and cutting the first blank areas of the plurality of first pole pieces; The step of gathering and cutting the first blank areas of the plurality of first pole pieces comprises: gathering the first blank areas of the plurality of first pole pieces; welding the first blank areas of the plurality of first pole pieces to form a cutting portion; and cutting the cutting portion; After the first blank areas of the multiple first pole sheets are gathered and cut, the first blank areas form a first connecting portion and a first pole ear portion, the first connecting portion connects the first coating area and the first pole ear portion, and along the third direction, the size of the first connecting portion is larger than the size of the first pole ear portion, and the third direction is perpendicular to the first direction and the second direction, wherein the first connecting portions of the multiple first pole sheets are gathered at one end of the laminated electrode assembly in the second direction and form a first gathering area, and the first pole ear portions of the multiple first pole sheets are stacked and protrude from the first gathering area along the second direction as a whole.

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