Battery monomer, battery, electric equipment and manufacturing equipment of battery monomer

Abstract

The utility model relates to a battery monomer, a battery, electric equipment and manufacturing equipment of the battery monomer, and belongs to the technical field of batteries. The electrode assembly comprises: a positive plate comprising a positive plate body and a positive tab protruding from the positive plate body; the negative plate comprises a negative plate body and a negative lug, and the negative lug protrudes out of the negative plate body; wherein the width of the negative tab is greater than that of the positive tab. The single battery formed by the electrode assembly has relatively high overcurrent capability and relatively high performance.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the priority of Chinese patent application CN202210033841.7, filed on January 12, 2022, entitled “Electrode assembly, battery cell, battery and electrical equipment”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application relates to the field of battery technology, and in particular to a battery cell, a battery, an electrical device, and a manufacturing device for a battery cell. Background Art

[0004] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages of energy conservation and environmental protection. For electric vehicles, battery technology is an important factor related to their development.

[0005] In the battery manufacturing process, in addition to considering energy density, the current capacity of the battery cell is also an important factor. Therefore, improving the current capacity of the battery cell is an urgent problem to be solved in battery technology. Utility Model Content

[0006] The purpose of the present application is to provide a battery cell, a battery, an electrical device and a manufacturing device for the battery cell. The battery cell formed by the electrode assembly has a high current capacity and the performance of the battery cell is high.

[0007] This application is implemented through the following technical solutions:

[0008] In a first aspect, the present application provides an electrode assembly, comprising: a positive electrode sheet, comprising a positive electrode sheet body and a positive electrode ear, wherein the positive electrode ear protrudes from the positive electrode sheet body; a negative electrode sheet, comprising a negative electrode sheet body and a negative electrode ear, wherein the negative electrode ear protrudes from the negative electrode sheet body; wherein the width of the negative electrode ear is greater than the width of the positive electrode ear.

[0009] Normally, the width of the negative electrode ear of the negative electrode sheet is the same as the width of the positive electrode ear of the positive electrode sheet. There may be a problem that the negative electrode ear has insufficient current carrying capacity, while the positive electrode ear has good and surplus current carrying capacity. The overall current carrying capacity of the battery cell depends on the current carrying capacity of the negative electrode ear with lower current carrying capacity.

[0010] According to the electrode assembly of the embodiment of the present application, relative to the electrode assembly composed of negative and positive pole ears of equal width, in the present application, the width of the negative pole ear is greater than the width of the positive pole ear, which increases the flow area of ​​the negative pole ear, improves the flow capacity of the negative pole ear, and thus improves the overall flow capacity of the battery cell assembled with the electrode assembly.

[0011] According to some embodiments of the present application, the negative electrode tab includes a plurality of sub-electrode tabs, and the sum of the widths of the plurality of sub-electrode tabs is greater than the width of the positive electrode tab.

[0012] In the above scheme, the sum of the widths of the multiple sub-electrode ears is greater than the width of the positive electrode ear. The width of the negative electrode ear is increased by providing multiple sub-electrode ears to improve the current flow capacity of the negative electrode ear and facilitate processing and manufacturing.

[0013] According to some embodiments of the present application, the plurality of sub-pole tabs include a first sub-pole tab and a second sub-pole tab, wherein the first sub-pole tab protrudes from a first edge of the negative electrode sheet body, and the second sub-pole tab protrudes from a second edge of the negative electrode sheet body.

[0014] In the above scheme, the first sub-pole ear protrudes from the first edge of the negative electrode sheet body, and the second sub-pole ear protrudes from the second edge of the negative electrode sheet body. The first edge and the second edge are two different edges of the negative electrode sheet body, and the layout is reasonable to avoid interference between components.

[0015] According to some embodiments of the present application, the first edge and the second edge are two opposite edges of the negative electrode sheet body.

[0016] In the above scheme, the first edge and the second edge are arranged relative to each other, which is convenient for rationally allocating assembly space, reducing space occupancy, ensuring that the battery cell structure assembled in the electrode assembly is compact, and ensuring that the battery cell has a high energy density.

[0017] According to some embodiments of the present application, the first sub-pole tab is located at one end of the electrode assembly, and the second sub-pole tab and the positive electrode tab are located at the other end of the electrode assembly.

[0018] In the above scheme, the second sub-electrode ear and the positive electrode ear are located at the same end of the electrode assembly, which rationally utilizes the assembly space and reduces space occupancy, making the battery cell structure assembled in the electrode assembly compact and ensuring that the battery cell has a high energy density.

[0019] According to some embodiments of the present application, the width of the first sub-pole tab is greater than the width of the second sub-pole tab.

[0020] In the above scheme, the width of the first sub-pole ear is greater than the width of the second sub-pole ear, so that the first sub-pole ear can have a longer extension width at the first edge, and even the width of the first sub-pole ear can be consistent with the length of the first edge. On the one hand, it ensures that the negative electrode ear has a larger flow area, and on the other hand, it is easy to process.

[0021] According to some embodiments of the present application, the width of the first sub-electrode tab is greater than the width of the positive electrode tab.

[0022] In the above scheme, the width of the first sub-electrode ear is greater than that of the positive electrode ear, ensuring that the negative electrode ear has a larger current capacity, and even the current capacity of the negative electrode ear can be greater than that of the positive electrode ear, thereby improving the overall current capacity of the battery cell assembled with the electrode assembly.

[0023] According to some embodiments of the present application, the width of the positive electrode tab is greater than the width of the second sub-electrode tab.

[0024] In the above solution, the width of the positive electrode ear is greater than the width of the second sub-electrode ear, so that the positive electrode ear has a wider width and a higher current carrying capacity.

[0025] According to some embodiments of the present application, the electrode assembly is a laminated electrode assembly.

[0026] In the above scheme, the laminated electrode assembly has convenient tab processing, high assembly precision and good heat dissipation.

[0027] In a second aspect, the present application provides a battery cell, comprising: a housing; and the electrode assembly described in the above embodiment, wherein the electrode assembly is disposed in the housing.

[0028] According to the battery cell of the embodiment of the present application, the electrode assembly is arranged in the shell, the width of the negative electrode ear is greater than the width of the positive electrode ear, the current carrying capacity of the negative electrode ear is increased, so that the overall current carrying capacity of the battery cell is improved, ensuring that the battery cell has a larger current carrying capacity.

[0029] In a third aspect, the present application provides a battery cell, comprising: a shell; a positive terminal, arranged in the shell; a first negative terminal and a second negative terminal, arranged in the shell; and the electrode assembly described in the above embodiment, wherein the electrode assembly is arranged in the shell, the positive electrode tab is electrically connected to the positive terminal, the first sub-electrode tab is electrically connected to the first negative terminal, and the second sub-electrode tab is electrically connected to the second negative terminal.

[0030] According to the battery cell of the embodiment of the present application, the width of the negative pole ear is greater than the width of the positive pole ear, the positive pole ear is electrically connected to the positive terminal, the first sub-pole ear is electrically connected to the first negative terminal, and the second sub-pole ear is electrically connected to the second negative terminal, the positive pole electric energy is extracted through the positive terminal, and the negative pole electric energy is extracted through the first negative terminal and the second negative terminal, and at the same time, the width of the negative pole ear is greater than the width of the positive pole ear, the current carrying capacity of the negative pole ear is increased, so that the battery cell has a higher current carrying capacity.

[0031] In a fourth aspect, the present application provides a battery cell, comprising: a shell; a positive terminal, disposed in the shell and insulated from the shell; a negative terminal, disposed in the shell and electrically connected to the shell; and the electrode assembly described in the above embodiment, wherein the electrode assembly is disposed in the shell, the positive electrode lug is electrically connected to the positive terminal, one of the first sub-electrode lug and the second sub-electrode lug is electrically connected to the negative terminal, and the other is electrically connected to the shell.

[0032] According to the battery cell of the embodiment of the present application, since the negative electrode ear includes a first sub-pole ear and a second sub-pole ear, the first sub-pole ear and the second sub-pole ear are electrically connected to the negative terminal and the shell respectively, and the negative terminal is electrically connected to the shell, and the negative electrode electric energy of the electrode assembly is gathered to the negative terminal for extraction, so as to facilitate electrical connection with other components (such as the battery cell). At the same time, the width of the negative electrode ear is greater than the width of the positive electrode ear, and the current carrying capacity of the negative electrode ear is increased, so that the battery cell has a higher current carrying capacity.

[0033] In a fifth aspect, the present application provides a battery, comprising a battery cell as described in the above embodiment.

[0034] In a sixth aspect, the present application provides an electrical device, comprising a battery as described in the above embodiment.

[0035] In the seventh aspect, the present application provides a method for manufacturing a battery cell, comprising: providing a shell; providing an electrode assembly, the electrode assembly comprising a positive electrode sheet and a negative electrode sheet, the positive electrode sheet comprising a positive electrode sheet body and a positive electrode ear, the positive electrode ear protruding from the positive electrode sheet body, the negative electrode sheet comprising a negative electrode sheet body and a negative electrode ear, the negative electrode ear protruding from the negative electrode sheet body, and the width of the negative electrode ear being greater than the width of the positive electrode ear; placing the electrode assembly into the shell.

[0036] In the eighth aspect, the present application provides a manufacturing device for a battery cell, including: a providing module for providing a shell and an electrode assembly, the electrode assembly including a positive electrode sheet and a negative electrode sheet, the positive electrode sheet including a positive electrode sheet body and a positive electrode ear, the positive electrode ear protruding from the positive electrode sheet body, the negative electrode sheet including a negative electrode sheet body and a negative electrode ear, the negative electrode ear protruding from the negative electrode sheet body, and the width of the negative electrode ear being greater than the width of the positive electrode ear; an assembling module for placing the electrode assembly into the shell.

[0037] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. 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 related drawings can be obtained based on these drawings without paying creative work.

[0039] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0040] Figure 2 A schematic diagram of the exploded structure of a battery provided in some embodiments of the present application;

[0041] Figure 3 A schematic diagram of the exploded structure of a battery cell provided in some embodiments of the present application;

[0042] Figure 4 A schematic diagram of the structure of an electrode assembly provided in some embodiments of the present application;

[0043] Figure 5 A schematic diagram of the structure of a negative electrode sheet of an electrode assembly provided in some embodiments of the present application;

[0044] Figure 6 A schematic diagram of the structure of a positive electrode sheet of an electrode assembly provided in some embodiments of the present application;

[0045] Figure 7 A schematic diagram of the structure of an electrode assembly provided in some other embodiments of the present application;

[0046] Figure 8 A schematic diagram of the exploded structure of a battery cell provided in some other embodiments of the present application;

[0047] Fig. 9 A schematic diagram of the exploded structure of a battery cell provided in some embodiments of the present application;

[0048] Fig.10 A schematic diagram of the exploded structure of a battery cell provided in some further embodiments of the present application;

[0049] Fig.11 A schematic flow chart of a method for manufacturing a battery cell according to some embodiments of the present application;

[0050] Fig.12 A schematic block diagram showing a manufacturing device for a battery cell according to some embodiments of the present application;

[0051] In the drawings, the drawings are not drawn to scale.

[0052] Marking description: 100-battery; 10-box; 101-first part; 102-second part; 1-battery cell; 11-housing; 111-housing; 112-end cover; 1121-first sub-end cover; 1122-second sub-end cover; 12-electrode assembly; 121-positive electrode sheet; 1211-positive electrode sheet body; 1212-positive electrode ear; 122-negative electrode sheet; 1221-negative electrode sheet body; 1221a-first edge; 1221b -second edge; 1222-negative electrode ear; 1222a-first sub-electrode ear; 1222b-second sub-electrode ear; 13-electrode terminal; 131-positive electrode terminal; 132-negative electrode terminal; 132a-first negative electrode terminal; 132b-second negative electrode terminal; 14-connecting component; 141-first sub-connecting component; 142-second sub-connecting component; 143-third sub-connecting component; 200-controller; 300-motor; 1000-vehicle. DETAILED DESCRIPTION

[0053] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0054] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. 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 and secondary relationship.

[0055] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0056] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0057] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists, A and B exist at the same time, and B exists. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0058] The term "multiple" as used in this application refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple sheets" refers to more than two sheets (including two sheets).

[0059] In this application, the battery mentioned herein refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in this application may include a battery module or a battery pack, etc.

[0060] In the present application, the 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 the present application are not limited to this.

[0061] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in the present application may include a battery module or a battery pack. The battery generally includes a box for encapsulating one or more battery cells. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

[0062] The battery cell includes an electrode assembly and an electrolyte. The electrode assembly is composed of a positive electrode sheet, a negative electrode sheet and a separator. The battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode current collector. The current collector not coated with the positive electrode active material layer protrudes from the current collector coated with the positive electrode active material layer. The current collector not coated with the positive electrode active material layer serves as a positive electrode ear. Taking lithium-ion batteries as an example, the material of the positive electrode current 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. The current collector not coated with the negative electrode active material layer protrudes from the current collector coated with the negative electrode active material layer. The current collector not coated with the negative electrode active material layer serves as a negative electrode ear. The material of the negative electrode current collector can be copper, and the negative electrode active material can be carbon or silicon, etc. In order to ensure that a large current does not melt, the number of positive tabs is multiple and stacked together, and the number of negative tabs is multiple and stacked together. The material of the isolation film can be PP (polypropylene) or PE (polyethylene).

[0063] The current capacity of a battery cell depends on the one with lower current capacity between the positive and negative ears of the electrode assembly. For example, if the current capacity of the negative ear is lower, the current capacity of the negative ear determines the overall current capacity of the battery cell.

[0064] During the battery manufacturing process, based on cost and material performance considerations, the negative electrode current collector is usually made of copper, with a current capacity of 8A / mm2 and a thickness of 4.5-10μm. The positive electrode current collector is usually made of aluminum, with a current capacity of 5A / mm2 and a thickness of 10-20μm. The thickness of the negative electrode current collector is often lower than that of the positive electrode current collector. Under normal circumstances, the width of the negative electrode ear of the negative electrode sheet is the same as the width of the positive electrode ear of the positive electrode sheet. There may be a problem that the negative electrode ear has insufficient current capacity, while the positive electrode ear has good and surplus current capacity. The overall current capacity of the battery cell depends on the current capacity of the negative electrode ear with lower current capacity. Insufficient current capacity of the negative electrode ear will limit the use of the battery cell and cause a series of safety problems. For example, insufficient current capacity of the battery cell will affect the charge and discharge rate of the battery cell, making the charge and discharge rate of the battery cell lower; under the rated capacity of the battery cell, if the current capacity of the battery cell is low, the output power of the battery cell will be low. For another example, when the overcurrent capacity of a battery cell is low, when the charge and discharge current is too large, the battery cell is prone to generate excessive heat, causing the battery cell to rupture, leak, smoke, or even explode, causing safety issues. Therefore, insufficient overcurrent capacity of a battery cell affects the performance of the battery cell (such as charge and discharge rate, safety, output power, etc.).

[0065] In view of this, in order to solve the problem of insufficient current carrying capacity of battery cells, the inventors, after in-depth research, designed an electrode assembly, which increases the width of the negative electrode ear so that the width of the negative electrode ear is greater than the width of the positive electrode ear, thereby improving the current carrying capacity of the negative electrode ear, thereby improving the overall current carrying capacity of the battery cell assembled by the electrode assembly.

[0066] Compared with the electrode assembly composed of positive and negative ears of the same width, in the electrode assembly of the present application, the width of the negative ear is increased, and the width of the negative ear is greater than that of the positive ear, so that the flow area of ​​the negative ear is increased, and the flow capacity of the negative ear is improved. When the flow capacity of the original positive ear remains unchanged or slightly decreases, the difference between the flow capacity of the negative ear and the flow capacity of the positive ear is reduced, and the flow capacity of the negative ear with weaker flow capacity in the electrode assembly is improved, thereby improving the overall flow capacity of the battery cell assembled by the electrode assembly.

[0067] The battery cells disclosed in the embodiments of the present application can be used, but not limited to, in electrical equipment such as vehicles, ships or aircraft. The power supply system of the electrical equipment can be composed of the battery cells and batteries disclosed in the present application.

[0068] The embodiment of the present application provides an electric device using a battery as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, an electric bicycle, an electric motorcycle, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0069] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device in an embodiment of the present application.

[0070] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure 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, and 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, and 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 be used as an operating power source for the vehicle 1000, for the circuit system of the vehicle 1000, for example, for the working power requirements during the startup, navigation and operation of the vehicle 1000.

[0071] The vehicle 1000 may further include a controller 200 and a motor 300 , wherein the controller 200 is used to control the battery 100 to supply power to the motor 300 , for example, to meet the power requirements of starting, navigating, and driving the vehicle 1000 .

[0072] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve 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.

[0073] Please refer to Figure 2 , Figure 2A schematic diagram of the exploded structure of a battery 100 provided for some embodiments of the present application. The battery 100 includes a case 10 and a battery cell 1, and the battery cell 1 is contained in the case 10. Among them, the case 10 is used to provide a storage space for the battery cell 1, and the case 10 can adopt a variety of structures. In some embodiments, the case 10 may include a first part 101 and a second part 102, and the first part 101 and the second part 102 cover each other, and the first part 101 and the second part 102 jointly define a storage space for accommodating the battery cell 1. The second part 102 may be a hollow structure with one end open, and the first part 101 may be a plate-like structure, and the first part 101 covers the open side of the second part 102, so that the first part 101 and the second part 102 jointly define a storage space; the first part 101 and the second part 102 may also be hollow structures with one side open, and the open side of the first part 101 covers the open side of the second part 102. Of course, the box body 10 formed by the first part 101 and the second part 102 can be in various shapes, such as a cylinder, a cuboid, etc.

[0074] In the battery 100, there may be multiple battery cells 1, and the multiple battery cells 1 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple battery cells 1 are both connected in series and in parallel. The multiple battery cells 1 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 1 is accommodated in the box 10; of course, the battery 100 may also be a battery module formed by connecting multiple battery cells 1 in series, in parallel, or in a mixed connection, and then the multiple battery 100 modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 10. The battery 100 may also include other structures, for example, the battery 100 may also include a converging component for realizing electrical connection between the multiple battery cells 1.

[0075] Each battery cell 1 may be a secondary battery or a primary battery. The battery cell 1 may be cylindrical, flat, rectangular or other shapes. The present application embodiment takes the battery cell 1 in a rectangular shape as an example.

[0076] Please refer to Figure 3 , Figure 3 The schematic diagram of the decomposition structure of the battery cell 1 provided in some embodiments of the present application. The battery cell 1 refers to the smallest unit constituting the battery 100. Figure 3 The battery cell 1 includes a housing 11, an electrode assembly 12 and other functional components.

[0077] The housing 11 is a component for forming the internal environment of the battery cell 1, and the formed internal environment can be used to accommodate the electrode assembly 12, electrolyte and other components. The housing 11 may include a shell 111 and an end cap 112. The shell 111 and the end cap 112 may be independent components, or an opening may be provided on the shell 111, and the internal environment of the battery cell 1 is formed by covering the opening with the end cap 112 at the opening. Without limitation, the end cap 112 and the shell 111 may be integrated. Specifically, the end cap 112 and the shell 111 may form a common connection surface before other components are put into the shell, and when the interior of the shell 111 needs to be encapsulated, the end cap 112 covers the shell 111. The shell 111 may be a rectangular parallelepiped. Specifically, the shape of the shell 111 may be determined according to the specific shape and size of the electrode assembly 12. The material of the shell 111 may be a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc., and the embodiment of the present application does not impose any special restrictions on this. The shell of the embodiment of the present application is a conductive component.

[0078] The end cap 112 refers to a component that covers the opening of the shell 111 to isolate the internal environment of the battery cell 1 from the external environment. Without limitation, the shape of the end cap 112 can be adapted to the shape of the shell 111 to match the shell 111. Optionally, the end cap 112 can be made of a material with a certain hardness and strength (such as an aluminum alloy), so that the end cap 112 is not easily deformed when squeezed and collided, so that the battery cell 1 can have a higher structural strength and the safety performance can also be improved. Functional components such as electrode terminals 13 can be provided on the end cap 112. The electrode terminal 13 can be used to electrically connect to the electrode assembly 12 for outputting or inputting electrical energy of the battery cell 1. In some embodiments, the end cap 112 can also be provided with a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 1 reaches a threshold. The material of the end cap 112 can also be a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. In some embodiments, an insulating member may be provided inside the end cap 112 to isolate the electrical connection components in the housing 111 from the end cap 112 to reduce the risk of short circuit. For example, the insulating member may be plastic, rubber, or the like.

[0079] The electrode assembly 12 is a component in the battery cell 1 where electrochemical reactions occur. One or more electrode assemblies 12 may be included in the housing 111. The electrode assembly 12 is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The body of the electrode assembly includes the parts of the positive and negative electrode sheets with active materials and the separator, and the parts of the positive and negative electrode sheets without active materials each constitute a pole ear. The positive pole ear and the negative pole ear may be located at both ends of the body, respectively. During the charge and discharge process of the battery 100, the positive electrode active material and the negative electrode active material react with the electrolyte, and the pole ear is connected to the electrode terminal 13 through the connecting component 14 to form a current loop.

[0080] The electrode terminal 13 is disposed on the housing 11, and is electrically connected to the electrode assembly 12 through the connecting component 14, so as to output or input the electric energy of the battery cell 1. The electrode terminal 13 generally includes a positive terminal and a negative terminal, wherein the positive terminal is electrically connected to the positive electrode tab, and the negative terminal is electrically connected to the negative electrode tab.

[0081] The embodiment of the present application is described by taking the battery cell 1 as a square battery cell as an example.

[0082] See also Figure 4 , Figure 4 This is a schematic diagram of the structure of the electrode assembly 12 provided in some embodiments of the present application, in which the positive electrode ear 1212 and the negative electrode ear 1222 are in an unfolded state.

[0083] According to some embodiments of the present application, Figure 4 As shown, the present application provides an electrode assembly 12. The electrode assembly 12 includes a positive electrode sheet 121 and a negative electrode sheet 122. The positive electrode sheet 121 includes a positive electrode sheet body 1211 and a positive electrode ear 1212, and the positive electrode ear 1212 protrudes from the positive electrode sheet body 1211. The negative electrode sheet 122 includes a negative electrode sheet body 1221 and a negative electrode ear 1222, and the negative electrode ear 1222 protrudes from the negative electrode sheet body 1221. Among them, the width L1 of the negative electrode ear 1222 is greater than the width L2 of the positive electrode ear 1212.

[0084] In the embodiment of the present application, the material of the positive electrode sheet 121 may be aluminum, and the material of the negative electrode sheet 122 may be copper.

[0085] The positive electrode tab 1212 is a portion of the positive electrode sheet 121 for electrically connecting to the positive electrode terminal 131 , and the negative electrode tab 1222 is a portion of the negative electrode sheet 122 for electrically connecting to the negative electrode terminal 132 .

[0086] In the figure, letter L1 indicates the width of the negative electrode ear 1222, and letter L2 indicates the width of the positive electrode ear 1212. The width of the electrode ear refers to the length dimension of the edge of the electrode ear protruding from the electrode body, that is, the dimension of the electrode ear in the extension direction of the edge. For example, if the electrode ear protrudes from the edge in the width direction of the electrode, the width of the electrode ear refers to the dimension of the electrode ear in the length direction of the electrode; or, if the electrode ear protrudes from the edge in the length direction of the electrode, the width of the electrode ear refers to the dimension of the electrode ear in the width direction of the electrode. Figure 4 As shown, taking the electrode assembly 12 as a laminated electrode assembly as an example, in order to meet the energy density of the battery cell 1, the pole ear protrudes from the edge of the length direction of the pole sheet, the width direction of the pole ear is consistent with the width direction of the pole sheet, and the width of the pole ear is the size of the pole ear in the width direction of the pole sheet.

[0087] The width L1 of the negative electrode ear 1222 is greater than the width L2 of the positive electrode ear 1212, which means that the length dimension of the negative electrode ear 1222 on the edge protruding from the negative electrode sheet body 1221 along the extension direction of the edge is L1, and the length dimension of the positive electrode ear 1212 on the edge protruding from the positive electrode sheet body 1211 along the extension direction of the edge is L2, satisfying L1>L2.

[0088] According to the electrode assembly 12 of the embodiment of the present application, relative to the electrode assembly 12 composed of the negative electrode ear 1222 and the positive electrode ear 1212 of equal width, in the present application, the width of the negative electrode ear 1222 is increased, and the width of the negative electrode ear 1222 is greater than the width of the positive electrode ear 1212, so that the flow area of ​​the negative electrode ear 1222 is increased, and the flow capacity of the negative electrode ear 1222 is improved. When the flow capacity of the original positive electrode ear 1212 remains unchanged or slightly decreases, the difference between the flow capacity of the negative electrode ear 1222 and the flow capacity of the positive electrode ear 1212 is reduced, and the flow capacity of the negative electrode ear 1222 with weaker flow capacity in the electrode assembly 12 is improved, thereby improving the overall flow capacity of the battery cell assembled by the electrode assembly 12.

[0089] According to some embodiments of the present application, optionally, the negative electrode tab 1222 includes a plurality of sub-electrode tabs, and the sum of the widths of the plurality of sub-electrode tabs is greater than the width of the positive electrode tab 1212 .

[0090] The negative electrode tab 1222 includes a plurality of sub-tabs, and the sum of the widths of the plurality of sub-tabs constitutes the width of the negative electrode tab 1222. In other words, the sum of the electrical energy of the plurality of sub-tabs is the electrical energy of the negative electrode tab 1222, and the negative electrode electrical energy is derived or imported through the plurality of sub-tabs.

[0091] The sum of the widths of the multiple sub-electrode ears is greater than the width of the positive electrode ear 1212. By providing multiple sub-electrode ears, the width of the negative electrode ear 1222 is increased to improve the current flow capacity of the negative electrode ear 1222, which is convenient for processing and manufacturing.

[0092] According to some embodiments of the present application, optionally, the number of positive tabs 1212 can be multiple, the sum of the widths of the multiple positive tabs 1212 constitutes the width of the positive tab 1212 , and the sum of the widths of the multiple sub-tabs is greater than the sum of the widths of the multiple positive tabs 1212 .

[0093] There are multiple positive electrode tabs 1212 to meet the current flow capacity requirements of the positive electrode tabs 1212 and to facilitate setting the positive electrode tabs 1212 at different positions to avoid interference between components.

[0094] See also Figure 5 and Figure 6 , Figure 5 A schematic diagram of the structure of the negative electrode sheet of the electrode assembly provided in some embodiments of the present application, Figure 6 A schematic diagram of the structure of the positive electrode sheet of the electrode assembly provided in some embodiments of the present application.

[0095] According to some embodiments of the present application, optionally, Figure 5 As shown, the plurality of sub-electrode tabs include a first sub-electrode tab 1222a and a second sub-electrode tab 1222b. The first sub-electrode tab 1222a protrudes from the first edge 1221a of the negative electrode sheet body 1221, and the second sub-electrode tab 1222b protrudes from the second edge 1221b of the negative electrode sheet body 1221.

[0096] The first sub-electrode tab 1222a protrudes from the first edge 1221a of the negative electrode sheet body 1221, and the second sub-electrode tab 1222b protrudes from the second edge 1221b of the negative electrode sheet body 1221. In other words, the first sub-electrode tab 1222a and the second sub-electrode tab 1222b protrude from the two edges of the negative electrode sheet body 1221 respectively.

[0097] In the figure, letter L11 indicates the width of the first sub-pole ear 1222a, and letter L12 indicates the width of the second sub-pole ear 1222b. The width L11 of the first sub-pole ear 1222a is the length dimension of the first sub-pole ear 1222a in the extending direction of the first edge 1221a, and the width L12 of the second sub-pole ear 1222b is the length dimension of the second sub-pole ear 1222b in the extending direction of the second edge 1221b. For example, Figure 5As shown, the first edge 1221a and the second edge 1221b can be two opposite edges of the negative electrode sheet body 1221, and the first edge 1221a and the second edge 1221b both extend along the width direction of the negative electrode sheet 122, and the width L11 of the first sub-pole ear 1222a is the length dimension of the first sub-pole ear 1222a in the width direction of the negative electrode sheet 122, and the width L12 of the second sub-pole ear 1222b is the length dimension of the second sub-pole ear 1222b in the width direction of the negative electrode sheet 122. For another example, the first edge 1221a and the second edge 1221b can be two adjacent edges of the negative electrode sheet body 1221, the first edge 1221a extends along the width direction of the negative electrode sheet 122, the second edge 1221b extends along the length direction of the negative electrode sheet 122, the width L11 of the first sub-pole ear 1222a is the length dimension of the first sub-pole ear 1222a in the width direction of the negative electrode sheet 122, and the width L12 of the second sub-pole ear 1222b is the length dimension of the second sub-pole ear 1222b in the length direction of the negative electrode sheet 122.

[0098] The sum of the width L11 of the first sub-electrode tab 1222a and the width L12 of the second sub-electrode tab 1222b is greater than the width L2 of the positive electrode tab 1212 (see Figure 6 ), that is, L11+L12>L2.

[0099] The first sub-pole ear 1222a protrudes from the first edge 1221a of the negative electrode sheet body 1221, and the second sub-pole ear 1222b protrudes from the second edge 1221b of the negative electrode sheet body 1221. The first edge 1221a and the second edge 1221b are two different edges of the negative electrode sheet body 1221, so that the first sub-pole ear 1222a and the second sub-pole ear 1222b are reasonably arranged to avoid interference between components.

[0100] When the first sub-pole tab 1222a protrudes from the first edge 1221a and the second sub-pole tab 1222b protrudes from the second edge 1221b, under the premise that the negative pole tab 1222 does not interfere with the positive pole tab 1212, the width L11 of the first sub-pole tab 1222a can be the same as the length of the first edge 1221a, or the width L12 of the second sub-pole tab 1222b can be the same as the length of the second edge 1221b, or the width L11 of the first sub-pole tab 1222a can be the same as the length of the first edge 1221a and the width L12 of the second sub-pole tab 1222b can be the same as the length of the second edge 1221b.

[0101] According to some embodiments of the present application, optionally, Figure 5 As shown, the first edge 1221 a and the second edge 1221 b are two opposite edges of the negative electrode sheet body 1221 .

[0102] The first edge 1221a and the second edge 1221b are two opposite edges of the negative electrode sheet body 1221 along a first direction. The first direction may be the direction in which the electrode assembly 12 enters the outer shell when the electrode assembly 12 is assembled with the outer shell.

[0103] The first edge 1221a and the second edge 1221b are arranged opposite to each other, so as to reasonably allocate the assembly space, reduce the space occupation, ensure the battery cell 1 assembled in the electrode assembly 12 has a compact structure, and ensure the battery cell 1 has a high energy density.

[0104] See also Figure 7 , Figure 7 Schematic diagram of the structure of the electrode assembly 12 provided in some other embodiments of the present application. According to some embodiments of the present application, optionally, Figure 7 As shown, the first sub-electrode tab 1222 a is located at one end of the electrode assembly 12 , and the second sub-electrode tab 1222 b and the positive electrode tab 1212 are located at the other end of the electrode assembly 12 .

[0105] The first sub-electrode tab 1222a and the positive electrode tab 1212 are respectively located at opposite ends of the electrode assembly 12, and the width L11 of the first sub-electrode tab 1222a can be set wider. For example, the width L11 of the first sub-electrode tab 1222a can be the length of the first edge 1221a.

[0106] The second sub-electrode tab 1222b and the positive electrode tab 1212 are located at the other end of the electrode assembly 12, that is, the second sub-electrode tab 1222b and the positive electrode tab 1212 are located at the same end of the electrode assembly 12. Since the electrode tab is a multi-layer structure, the multi-layer second sub-electrode tab 1222b and the multi-layer positive electrode tab 1212 do not interfere with each other to avoid internal short circuit.

[0107] In the embodiment where the electrode assembly 12 is a wound electrode assembly, the second sub-electrode tab 1222b and the positive electrode tab 1212 may be located on both sides of the thickness direction of the electrode assembly 12 (i.e., the stacking direction of the tabs), and the projection of the second sub-electrode tab 1222b and the projection of the positive electrode tab 1212 may overlap or not overlap in the thickness direction of the electrode assembly 12, as long as the second sub-electrode tab 1222b and the positive electrode tab 1212 are not in contact. In the embodiment where the electrode assembly 12 is a laminated electrode assembly, Figure 7 As shown, in the thickness direction of the electrode assembly 12 , the projection of the second sub-electrode tab 1222 b does not overlap with the projection of the positive electrode tab 1212 , so as to avoid short circuit between the second sub-electrode tab 1222 b and the positive electrode tab 1212 .

[0108] The second sub-electrode tab 1222b and the positive electrode tab 1212 are located at the same end of the electrode assembly 12, which rationally utilizes the assembly space and reduces space occupancy, making the battery cell structure assembled in the electrode assembly 12 compact and ensuring that the battery cell has a high energy density.

[0109] According to some embodiments of the present application, optionally, a width L11 of the first sub-electrode tab 1222 a is greater than a width L12 of the second sub-electrode tab 1222 b .

[0110] The first sub-pole tab 1222a and the second sub-pole tab 1222b protrude from two edges of the negative electrode sheet body 1221 respectively. The length of the first sub-pole tab 1222a on the first edge 1221a can be determined according to the length of the first edge 1221a. In the extreme case, the width L11 of the first sub-pole tab 1222a is the same as the length of the first edge 1221a.

[0111] In an embodiment where the second sub-pole lug 1222b and the positive pole lug 1212 are located at the same end of the electrode assembly 12, the width L11 of the first sub-pole lug 1222a is greater than the width L12 of the second sub-pole lug 1222b. On the premise that the second sub-pole lug 1222b does not interfere with the positive pole lug 1212, the width L11 of the first sub-pole lug 1222a is increased, so that the sum of the widths of the first sub-pole lug 1222a and the second sub-pole lug 1222b can be ensured to be greater than the width L2 of the positive pole lug 1212.

[0112] The width L11 of the first sub-pole ear 1222a is greater than the width L12 of the second sub-pole ear 1222b, so that the first sub-pole ear 1222a can have a longer extension width at the first edge 1221a, and even the width L11 of the first sub-pole ear 1222a can be consistent with the length of the first edge 1221a. On the one hand, it is convenient to realize that the negative electrode ear 1222 has a larger flow area, and on the other hand, it is convenient for processing.

[0113] According to some embodiments of the present application, optionally, Figure 7 As shown, the width L11 of the first sub-electrode tab 1222 a is greater than the width L2 of the positive electrode tab 1212 .

[0114] If the width L11 of the first sub-electrode tab 1222a is greater than the width L2 of the positive electrode tab 1212 , the sum of the widths of the first sub-electrode tab 1222a and the second sub-electrode tab 1222b must be greater than the width L2 of the positive electrode tab 1212 , and the width L12 of the second sub-electrode tab 1222b can be determined according to the assembly space of the electrode assembly 12 .

[0115] When the negative electrode tab 1222 requires a larger flow capacity, the width L12 of the second sub-tab 1222 b may be larger, so that the negative electrode tab 1222 has a larger width, the flow area of ​​the negative electrode tab 1222 is increased, and the flow capacity of the negative electrode tab 1222 is improved.

[0116] The width L11 of the first sub-pole ear 1222a is greater than the width L2 of the positive pole ear 1212, ensuring that the sum of the widths of the first sub-pole ear 1222a and the second sub-pole ear 1222b is greater than the width L2 of the positive pole ear 1212, ensuring that the negative pole ear 1222 has a larger current capacity, and even the current capacity of the negative pole ear 1222 can be greater than the current capacity of the positive pole ear 1212, thereby improving the overall current capacity of the battery cell assembled with the electrode assembly 12.

[0117] According to some embodiments of the present application, optionally, Figure 7 As shown, the width L2 of the positive electrode tab 1212 is greater than the width L12 of the second sub-electrode tab 1222b.

[0118] The width L2 of the positive electrode tab 1212 is greater than the width L12 of the second sub-electrode tab 1222 b , ensuring that the positive electrode tab 1212 has a wider width and a larger flow area, thereby ensuring that the positive electrode tab 1212 has a larger flow capacity.

[0119] The second sub-electrode tab 1222 b protrudes from the second edge 1221 b of the negative electrode sheet 122 . The positive electrode tab 1212 and the second sub-electrode tab 1222 b may be located at the same end of the electrode assembly 12 or at different ends of the electrode assembly 12 .

[0120] In an embodiment where the first sub-electrode tab 1222a is located at one end of the electrode assembly 12, and the second sub-electrode tab 1222b and the positive electrode tab 1212 are located at the other end of the electrode assembly 12, as shown in FIG. Figure 7 As shown, the first sub-pole ear 1222a and the positive pole ear 1212 are respectively located at the two ends of the electrode assembly 12, and the width L2 of the positive pole ear 1212 is greater than the width L12 of the second sub-pole ear 1222b, so that the width L11 of the first sub-pole ear 1222a can be wider to ensure that the sum of the widths of the first sub-pole ear 1222a and the second sub-pole ear 1222b is greater than the width L2 of the positive pole ear 1212.

[0121] According to some embodiments of the present application, optionally, the electrode assembly 12 is a laminated electrode assembly.

[0122] The laminated electrode assembly has the advantages of relatively uniform current density distribution and excellent internal heat dissipation.

[0123] When the electrode assembly 12 is a laminated electrode assembly, the width of the electrode at the edge of the corresponding electrode body can be the same as the length of the edge. For example, in an embodiment where the negative electrode tab 1222 includes a first sub-electrode tab 1222a and a second sub-electrode tab 1222b, the width L11 of the first sub-electrode tab 1222a can be the same as the length of the first edge 1221a; or, the width L11 of the first sub-electrode tab 1222a can be the same as the length of the first edge 1221a, and the width L12 of the second sub-electrode tab 1222b can be the same as the length of the second edge 1221b. Similarly, the width L2 of the positive electrode tab 1212 can be the same as the length of the edge of the positive electrode sheet body 1211.

[0124] Alternatively, if Figure 5 As shown, the width L11 of the first sub-electrode tab 1222 a is the same as the length of the first edge 1221 a .

[0125] The laminated electrode assembly has convenient tab processing, high assembly precision and good heat dissipation.

[0126] See also Figures 8 to 10 , Figure 8 Schematic diagram of the exploded structure of a battery cell 1 provided in some other embodiments of the present application, Fig. 9 This is a schematic diagram of the exploded structure of a battery cell 1 provided in some embodiments of the present application. Fig.10 Schematic diagram of the exploded structure of a battery cell 1 provided in some further embodiments of the present application.

[0127] According to some embodiments of the present application, Figures 8 to 10 As shown, the present application further provides a battery cell 1 , comprising a housing 11 and the electrode assembly 12 described in the above solution, wherein the electrode assembly 12 is disposed in the housing 11 .

[0128] The outer shell 11 is a component for protecting the electrode assembly 12, and has a space inside thereof for accommodating the electrode assembly 12. The outer shell 11 generally has high strength, and improves the safety performance of the battery cell 1.

[0129] According to the battery cell 1 of the embodiment of the present application, the electrode assembly 12 is arranged in the outer shell 11, the width of the negative electrode ear 1222 is greater than the width of the positive electrode ear 1212, and the current carrying capacity of the negative electrode ear 1222 is increased, so that the overall current carrying capacity of the battery cell 1 is improved, ensuring that the battery cell 1 has a larger current carrying capacity.

[0130] According to some embodiments of the present application, Figure 8As shown, the present application also provides a battery cell 1, including a housing 11, a positive terminal 131, a first negative terminal 132a and a second negative terminal 132b, and the electrode assembly 12 described in the above scheme. The positive terminal 131 is arranged on the housing 11, and the first negative terminal 132a and the second negative terminal 132b are arranged on the housing 11. The electrode assembly 12 is arranged in the housing 11, the positive electrode ear 1212 is electrically connected to the positive terminal 131, the first sub-electrode ear 1222a is electrically connected to the first negative terminal 132a, and the second sub-electrode ear 1222b is electrically connected to the second negative terminal 132b.

[0131] The housing 11 may include a shell 111 and an end cap 112. The shell 111 may be a structure with two openings at both ends. The number of the end caps 112 may be two. The two end caps 112 respectively cover the two openings of the shell 111, and the end caps 112 are sealed and connected to the shell 111. Figure 8 As shown, the two openings are located at opposite ends of the housing 111 , and the two end covers 112 are disposed opposite to each other.

[0132] The first negative terminal 132a may be provided on one end cap 112, and the second negative terminal 132b and the positive terminal 131 may be provided on the other end cap 112. The end cap 112 and the housing 111 may be electrically connected or insulated.

[0133] Alternatively, if Figure 8 As shown, the two end covers 112 are respectively a first sub-end cover 1121 and a second sub-end cover 1122, the first negative terminal 132a is arranged on the first sub-end cover 1121, the second negative terminal 132b and the positive terminal 131 are arranged on the second sub-end cover 1122, the first sub-pole ear 1222a is electrically connected to the first negative terminal 132a through the first sub-connecting component 141, the second sub-pole ear 1222b is electrically connected to the second negative terminal 132b through the second sub-connecting component 142, and the positive ear 1212 is electrically connected to the positive terminal 131 through the third sub-connecting component 143.

[0134] According to the battery cell 1 of the embodiment of the present application, the width of the negative pole ear 1222 is greater than the width of the positive pole ear 1212, the positive pole ear 1212 is electrically connected to the positive terminal 131, the first sub-pole ear 1222a is electrically connected to the first negative terminal 132a, and the second sub-pole ear 1222b is electrically connected to the second negative terminal 132b, the positive pole electric energy is extracted through the positive terminal 131, and the negative pole electric energy is extracted through the first negative terminal 132a and the second negative terminal 132b, and at the same time, the width of the negative pole ear 1222 is greater than the width of the positive pole ear 1212, the current carrying capacity of the negative pole ear 1222 is increased, so that the battery cell 1 has a higher current carrying capacity.

[0135] According to some embodiments of the present application, the present application also provides a battery cell 1, such as Fig. 9 and Fig.10 As shown, it includes a housing 11, a positive terminal 131, a negative terminal 132, and the electrode assembly 12 described in the above scheme. The positive terminal 131 is arranged in the housing 11 and is insulated from the housing 11. The negative terminal 132 is arranged in the housing 11 and is electrically connected to the housing 11. The electrode assembly 12 is arranged in the housing 11, the positive electrode ear 1212 is electrically connected to the positive terminal 131, one of the first sub-electrode ear 1222a and the second sub-electrode ear 1222b is electrically connected to the negative terminal 132, and the other is electrically connected to the housing 11.

[0136] The housing 11 may include a shell 111 and an end cap 112. The shell 111 may be a structure with two openings at both ends. The number of the end caps 112 may be two. The two end caps 112 respectively cover the two openings of the shell 111, and the end caps 112 are sealed and connected to the shell 111. Fig. 9 and Fig.10 As shown, two openings are located at opposite ends of the housing 111 , and two end caps 112 are arranged opposite to each other. The end caps 112 are electrically connected to the housing 111 .

[0137] The positive terminal 131 is disposed on the outer shell 11 and is insulated from the outer shell 11 . The positive terminal 131 may be disposed on an end cover 112 and is insulated from the end cover 112 , so that the positive terminal 131 can be used to extract or import positive electrical energy.

[0138] One of the first sub-pole tab 1222a and the second sub-pole tab 1222b is electrically connected to the negative terminal 132, and the other is electrically connected to the housing 11. The first sub-pole tab 1222a is electrically connected to the negative terminal 132, and the second sub-pole tab 1222b is electrically connected to the housing 11. Alternatively, the first sub-pole tab 1222a is electrically connected to the housing 11, and the second sub-pole tab 1222b is electrically connected to the negative terminal 132. Since the negative terminal 132 is disposed on the housing 11 and is electrically connected to the housing 11, the first sub-pole tab 1222a and the second sub-pole tab 1222b are connected in series.

[0139] Alternatively, if Fig. 9 As shown, the two end covers 112 are respectively a first sub-end cover 1121 and a second sub-end cover 1122, the first sub-pole ear 1222a is electrically connected to the first sub-end cover 1121 through a first sub-connecting component 141, the negative terminal 132 and the positive terminal 131 are arranged on the second sub-end cover 1122, the second sub-pole ear 1222b is electrically connected to the negative terminal 132 through the second sub-connecting component 142, and the positive ear 1212 is electrically connected to the positive terminal 131 through a third sub-connecting component 143.

[0140] Alternatively, if Fig.10As shown, the two end covers 112 are respectively a first sub-end cover 1121 and a second sub-end cover 1122, the negative terminal 132 is arranged on the first sub-end cover 1121 and is electrically connected to the first sub-end cover 1121, the positive terminal 131 is arranged on the second sub-end cover 1122 and is insulated from the second sub-end cover 1122, the first sub-pole ear 1222a is electrically connected to the negative terminal 132 through the first sub-connecting component 141, the second sub-pole ear 1222b is electrically connected to the second sub-end cover 1122 through the second sub-connecting component 142, and the positive ear 1212 is electrically connected to the positive terminal 131 through the third sub-connecting component 143.

[0141] According to the battery cell 1 of the embodiment of the present application, since the negative pole ear 1222 includes a first sub-pole ear 1222a and a second sub-pole ear 1222b, the first sub-pole ear 1222a and the second sub-pole ear 1222b are electrically connected to the negative terminal 132 and the outer shell 11 respectively, and the negative terminal 132 is electrically connected to the outer shell 11, the negative pole electric energy of the electrode assembly 12 is gathered to the negative terminal 132 for export, so as to facilitate electrical connection with other components (such as the battery cell 1), and at the same time, the width of the negative pole ear 1222 is greater than the width of the positive pole ear 1212, the current carrying capacity of the negative pole ear 1222 is increased, so that the battery cell 1 has a higher current carrying capacity.

[0142] According to some embodiments of the present application, the present application further provides a battery 100, comprising the battery cell 1 described in the above solution.

[0143] According to some embodiments of the present application, the present application further provides an electrical device, comprising the battery 100 described in the above scheme, and the battery 100 is used to provide electrical energy to the electrical device.

[0144] The power-consuming device may be any of the aforementioned devices or systems using the battery 100 .

[0145] According to some embodiments of the present application, see Figures 3 to 10The present application provides a battery cell 1, which includes a housing 11 and an electrode assembly 12, wherein the electrode assembly 12 is disposed in the housing 11. The electrode assembly 12 is a laminated electrode assembly, wherein the electrode assembly 12 includes a positive electrode sheet 121 and a negative electrode sheet 122, wherein the positive electrode sheet 121 includes a positive electrode sheet body 1211 and a positive electrode ear 1212, wherein the positive electrode ear 1212 protrudes from the positive electrode sheet body 1211, and the negative electrode sheet 122 includes a negative electrode sheet body 1221 and a negative electrode ear 1222, wherein the negative electrode ear 1222 protrudes from the negative electrode sheet body 1221. The negative electrode ear 1222 includes a first sub-electrode ear 1222a and a second sub-electrode ear 1222b, wherein the first sub-electrode ear 1222a protrudes from a first edge 1221a of the negative electrode sheet body 1221, and the second sub-electrode ear 1222b protrudes from a second edge 1221b of the negative electrode sheet body 1221. The first sub-electrode tab 1222a is located at one end of the electrode assembly 12, the second sub-electrode tab 1222b and the positive electrode tab 1212 are located at the other end of the electrode assembly 12, and the sum of the widths of the first sub-electrode tab 1222a and the second sub-electrode tab 1222b is greater than the width of the positive electrode tab 1212. The width of the first sub-electrode tab 1222a is the same as the length of the first edge 1221a.

[0146] According to the battery cell 1 of the embodiment of the present application, the width of the negative electrode ear 1222 is increased, so that the negative electrode ear 1222 has a larger flow area, which improves the flow capacity of the negative electrode ear 1222, and thus the battery cell 1 has a higher flow capacity.

[0147] Fig.11 Schematic flow chart of a method for manufacturing a battery cell 1 according to some embodiments of the present application is shown. According to some embodiments of the present application, Fig.11 As shown, the present application also provides a method for manufacturing a battery cell 1, and the method for manufacturing the battery cell 1 includes:

[0148] S401, providing a housing 11;

[0149] S402, providing an electrode assembly 12, the electrode assembly 12 comprising a positive electrode sheet 121 and a negative electrode sheet 122, the positive electrode sheet 121 comprising a positive electrode sheet body 1211 and a positive electrode ear 1212, the positive electrode ear 1212 protruding from the positive electrode sheet body 1211, the negative electrode sheet 122 comprising a negative electrode sheet body 1221 and a negative electrode ear 1222, the negative electrode ear 1222 protruding from the negative electrode sheet body 1221, and the width of the negative electrode ear 1222 being greater than the width of the positive electrode ear 1212;

[0150] S403 , placing the electrode assembly 12 into the housing 11 .

[0151] In the above steps, the order of step "S401, providing the outer shell 11" and step "S402, providing the electrode assembly 12" is not limited. Step "S401, providing the outer shell 11" can be executed first, and then step "S402, providing the electrode assembly 12" can be executed, or step "S402, providing the electrode assembly 12" can be executed first, and then step "S401, providing the outer shell 11" can be executed.

[0152] Fig.12 Schematic block diagram of a battery cell manufacturing device 500 according to some embodiments of the present application is shown. According to some embodiments of the present application, Fig.12 As shown, the present application also provides a battery cell manufacturing device 500, which includes: a providing module 501 and an assembling module 502. The providing module 501 is used to provide a housing 11 and an electrode assembly 12, wherein the electrode assembly 12 includes a positive electrode sheet 121 and a negative electrode sheet 122, wherein the positive electrode sheet 121 includes a positive electrode sheet body 1211 and a positive electrode ear 1212, wherein the positive electrode ear 1212 protrudes from the positive electrode sheet body 1211, and the negative electrode sheet 122 includes a negative electrode sheet body 1221 and a negative electrode ear 1222, wherein the negative electrode ear 1222 protrudes from the negative electrode sheet body 1221, and the width of the negative electrode ear 1222 is greater than the width of the positive electrode ear 1212. The assembling module 502 is used to place the electrode assembly 12 into the housing 11.

[0153] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that: include: shell; A positive terminal, disposed on the housing and insulated from the housing; a negative terminal, disposed on the housing and electrically connected to the housing; as well as An electrode assembly, the electrode assembly being disposed in the housing, the electrode assembly comprising: A positive electrode sheet, comprising a positive electrode sheet body and a positive electrode ear, wherein the positive electrode ear protrudes from the positive electrode sheet body; A negative electrode sheet, comprising a negative electrode sheet body and a negative electrode ear, wherein the negative electrode ear protrudes from the negative electrode sheet body; Wherein, the width of the negative electrode ear is greater than the width of the positive electrode ear; The negative electrode tab includes a plurality of sub-electrode tabs, and the sum of the widths of the plurality of sub-electrode tabs is greater than the width of the positive electrode tab; The plurality of sub-electrode tabs include a first sub-electrode tab and a second sub-electrode tab, wherein the first sub-electrode tab protrudes from a first edge of the negative electrode sheet body, and the second sub-electrode tab protrudes from a second edge of the negative electrode sheet body; The positive electrode tab is electrically connected to the positive electrode terminal, one of the first sub-electrode tab and the second sub-electrode tab is electrically connected to the negative electrode terminal, and the other is electrically connected to the housing.

2. The battery cell according to claim 1, characterized in that: The first edge and the second edge are two opposite edges of the negative electrode sheet body.

3. The battery cell according to claim 1, characterized in that: The first sub-electrode tab is located at one end of the electrode assembly, and the second sub-electrode tab and the positive electrode tab are located at the other end of the electrode assembly.

4. The battery cell according to claim 1, characterized in that: The width of the first sub-electrode tab is greater than the width of the second sub-electrode tab.

5. The battery cell according to claim 1, characterized in that: The width of the first sub-electrode tab is greater than the width of the positive electrode tab.

6. The battery cell according to claim 1, characterized in that: The width of the positive electrode tab is greater than the width of the second sub-electrode tab.

7. The battery cell according to any one of claims 1 to 6, characterized in that: The electrode assembly is a laminated electrode assembly.

8. A battery, characterized in that: The invention comprises a battery cell as claimed in any one of claims 1 to 7.

9. An electrical device, characterized in that: Comprising the battery as claimed in claim 8.

10. A battery cell manufacturing device, used for manufacturing the battery cell according to any one of claims 1 to 7, characterized in that: include: Providing a module for providing a housing and an electrode assembly, wherein the electrode assembly comprises a positive electrode sheet and a negative electrode sheet, wherein the positive electrode sheet comprises a positive electrode sheet body and a positive electrode ear, wherein the positive electrode ear protrudes from the positive electrode sheet body, and the negative electrode sheet comprises a negative electrode sheet body and a negative electrode ear, wherein the negative electrode ear protrudes from the negative electrode sheet body, and the width of the negative electrode ear is greater than the width of the positive electrode ear; An assembly module is used to place the electrode assembly into the housing.

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