Electrode assembly, battery cell, battery, and electric device

Abstract

The application relates to an electrode assembly, a battery monomer, a battery and an electric equipment, and belongs to the technical field of batteries. The electrode assembly comprises a positive electrode sheet, a negative electrode sheet, a positive electrode lug and a negative electrode lug. The positive electrode sheet comprises a positive electrode sheet body and the positive electrode lug, and the positive electrode lug protrudes from the positive electrode sheet body. The negative electrode sheet comprises a negative electrode sheet body and the negative electrode lug, and the negative electrode lug protrudes from the negative electrode sheet body. The width of the negative electrode lug is greater than that of the positive electrode lug. The battery monomer formed by the electrode assembly has high overcurrent capacity, and the performance of the battery monomer is high.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to an electrode assembly, a battery monomer, a battery and an electric device. BACKGROUND

[0002] Energy saving and emission reduction is 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 energy saving and environmental protection advantages. For electric vehicles, battery technology is an important factor for their development.

[0003] In the process of battery manufacturing, in addition to considering the energy density, the overcurrent capacity of the battery monomer is also an important factor. Therefore, improving the overcurrent capacity of the battery monomer is a problem that needs to be solved in battery technology. SUMMARY

[0004] The purpose of the present application is to provide an electrode assembly, a battery monomer, a battery and an electric device. The battery monomer composed of the electrode assembly has high overcurrent capacity, and the performance of the battery monomer is high.

[0005] The present application is realized by the following technical scheme:

[0006] 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 tab, the positive electrode tab protruding from the positive electrode sheet body; a negative electrode sheet comprising a negative electrode sheet body and a negative electrode tab, the negative electrode tab protruding from the negative electrode sheet body; wherein the width of the negative electrode tab is greater than the width of the positive electrode tab.

[0007] Generally, the width of the negative electrode tab of the negative electrode sheet is the same as the width of the positive electrode tab of the positive electrode sheet. There may be a problem that the overcurrent capacity of the negative electrode tab is insufficient, while the overcurrent capacity of the positive electrode tab is good and has a surplus, and the overall overcurrent capacity of the battery monomer depends on the overcurrent capacity of the negative electrode tab with lower overcurrent capacity.

[0008] According to the electrode assembly of the present application, compared with the electrode assembly composed of negative electrode tabs and positive electrode tabs with equal width, in the present application, the width of the negative electrode tab is greater than the width of the positive electrode tab, the overcurrent area of the negative electrode tab is increased, the overcurrent capacity of the negative electrode tab is improved, and the overall overcurrent capacity of the battery monomer assembled by the electrode assembly is improved.

[0009] According to some embodiments of the present application, the negative electrode tab comprises a plurality of sub-tabs, and the sum of the widths of the plurality of sub-tabs is greater than the width of the positive electrode tab.

[0010] In the above scheme, the sum of the widths of the plurality of sub-tabs is greater than the width of the positive electrode tab, and the width of the negative electrode tab is increased by setting the plurality of sub-tabs to improve the overcurrent capacity of the negative electrode tab, which is convenient for processing and manufacturing.

[0011] According to some embodiments of the present application, the plurality of sub-tab includes a first sub-tab and a second sub-tab, the first sub-tab protrudes from a first edge of the negative tab body, and the second sub-tab protrudes from a second edge of the negative tab body.

[0012] In the above scheme, the first sub-tab protrudes from a first edge of the negative tab body, and the second sub-tab protrudes from a second edge of the negative tab body, the first edge and the second edge are two different edges of the negative tab body, the layout is reasonable, and interference between components is avoided.

[0013] According to some embodiments of the present application, the first edge and the second edge are two opposite edges of the negative tab body.

[0014] In the above scheme, the first edge and the second edge are oppositely arranged, which facilitates reasonable allocation of assembly space, reduces space occupation, ensures that the battery monomer structure assembled by the electrode assembly is compact, and ensures that the battery monomer has a high energy density.

[0015] According to some embodiments of the present application, the first sub-tab is located at one end of the electrode assembly, and the second sub-tab and the positive tab are located at the other end of the electrode assembly.

[0016] In the above scheme, the second sub-tab and the positive tab are located at the same end of the electrode assembly, the assembly space is reasonably utilized, the space occupation is reduced, the battery monomer structure assembled by the electrode assembly is compact, and the battery monomer has a high energy density.

[0017] According to some embodiments of the present application, the width of the first sub-tab is greater than the width of the second sub-tab.

[0018] In the above scheme, the width of the first sub-tab is greater than the width of the second sub-tab, so that the first sub-tab can have a longer extension width at the first edge, and even the width of the first sub-tab can be consistent with the length of the first edge, on the one hand, ensuring that the negative tab has a larger flow area, and on the other hand, facilitating processing.

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

[0020] In the above scheme, the width of the first sub-tab is greater than the width of the positive tab, ensuring that the negative tab has a larger flow capacity, and even the flow capacity of the negative tab can be greater than the flow capacity of the positive tab, improving the overall flow capacity of the battery monomer assembled by the electrode assembly.

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

[0022] In the above scheme, the width of the positive tab is greater than the width of the second sub-tab, so that the positive tab has a wider width and a higher current-carrying capacity.

[0023] According to some embodiments of the present application, the electrode assembly is a laminated electrode assembly.

[0024] In the above scheme, the laminated electrode assembly is convenient to process, has high assembly precision, and has good heat dissipation.

[0025] In the above scheme, the laminated electrode assembly is convenient to process, has high assembly precision, and has good heat dissipation.

[0026] According to the battery cell of the embodiments of the present application, the electrode assembly is arranged in the shell, the width of the negative tab is greater than the width of the positive tab, the current-carrying capacity of the negative tab is increased, the overall current-carrying capacity of the battery cell is improved, and the battery cell has a large current-carrying capacity.

[0027] In the above scheme, the laminated electrode assembly is convenient to process, has high assembly precision, and has good heat dissipation.

[0028] According to the battery cell of the embodiments of the present application, the width of the negative tab is greater than the width of the positive tab, the positive tab is electrically connected to the positive terminal, the first sub-tab is electrically connected to the first negative terminal, and the second sub-tab is electrically connected to the second negative terminal, the positive electric energy is led out through the positive terminal, the negative electric energy is led out through the first negative terminal and the second negative terminal, and the width of the negative tab is greater than the width of the positive tab, so that the battery cell has a high current-carrying capacity.

[0029] In the above scheme, the laminated electrode assembly is convenient to process, has high assembly precision, and has good heat dissipation.

[0030] According to the battery cell provided in the embodiments of the present application, since the negative tab includes the first sub-tab and the second sub-tab, the negative tab is electrically connected to the negative terminal and the shell through the first sub-tab and the second sub-tab respectively, and the negative terminal is electrically connected to the shell, so that the negative electricity of the electrode assembly is converged to the negative terminal for being led out to facilitate the electrical connection with other components (such as a battery cell), and meanwhile, the width of the negative tab is greater than the width of the positive tab, and the overcurrent capacity of the negative tab is increased, so that the battery cell has a higher overcurrent capacity.

[0031] In a fifth aspect, the present application provides a battery comprising the battery cell as described in the above embodiments.

[0032] In a sixth aspect, the present application provides a use-electric device comprising the battery as described in the above embodiments.

[0033] In a seventh aspect, the present application provides a manufacturing method of a battery cell, comprising: providing a shell; providing an electrode assembly, the electrode assembly comprising a positive tab and a negative tab, the positive tab comprising a positive tab body and a positive tab, the positive tab protruding from the positive tab body, the negative tab comprising a negative tab body and a negative tab, the negative tab protruding from the negative tab body, the width of the negative tab being greater than the width of the positive tab; and placing the electrode assembly into the shell.

[0034] In an eighth aspect, the present application provides a manufacturing device of a battery cell, comprising: a providing module configured to provide a shell and provide an electrode assembly, the electrode assembly comprising a positive tab and a negative tab, the positive tab comprising a positive tab body and a positive tab, the positive tab protruding from the positive tab body, the negative tab comprising a negative tab body and a negative tab, the negative tab protruding from the negative tab body, the width of the negative tab being greater than the width of the positive tab; and an assembling module configured to place the electrode assembly into the shell.

[0035] Additional aspects and advantages of the present application will be made apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0036] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be considered as a limitation to the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0037] Figure 1 The structural schematic diagram of a vehicle is provided for some embodiments of the present application;

[0038] Figure 2A schematic exploded view of a battery according to some embodiments of the application;

[0039] Figure 3 A schematic exploded view of a battery cell according to some embodiments of the application;

[0040] Figure 4 A schematic view of an electrode assembly according to some embodiments of the application;

[0041] Figure 5 A schematic view of a negative electrode sheet of an electrode assembly according to some embodiments of the application;

[0042] Figure 6 A schematic view of a positive electrode sheet of an electrode assembly according to some embodiments of the application;

[0043] Figure 7 A schematic view of an electrode assembly according to some other embodiments of the application;

[0044] Figure 8 A schematic exploded view of a battery cell according to some other embodiments of the application;

[0045] Figure 9 A schematic exploded view of a battery cell according to some other embodiments of the application;

[0046] Figure 10 A schematic exploded view of a battery cell according to some other embodiments of the application;

[0047] Figure 11 A schematic flow chart of a method of manufacturing a battery cell according to some embodiments of the application;

[0048] Figure 12 A schematic block diagram of a manufacturing apparatus for a battery cell according to some embodiments of the application.

[0049] Icon: 100 - battery; 10 - case; 101 - first part; 102 - second part; 1 - battery cell; 11 - shell; 111 - housing; 112 - end cover; 1121 - first sub-end cover; 1122 - second sub-end cover; 12 - electrode assembly; 121 - positive plate; 1211 - positive plate body; 1212 - positive tab; 122 - negative plate; 1221 - negative plate body; 1221a - first edge; 1221b - second edge; 1222 - negative tab; 1222a - first sub-tab; 1222b - second sub-tab; 13 - electrode terminal; 131 - positive terminal; 132 - negative terminal; 132a - first negative terminal; 132b - second negative terminal; 14 - connecting member; 141 - first sub-connecting member; 142 - second sub-connecting member; 143 - third sub-connecting member; 200 - controller; 300 - motor; 1000 - vehicle. DETAILED DESCRIPTION

[0050] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0051] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as those commonly understood by one of ordinary skill in the art to which this application belongs; the terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion. The terms "first", "second" and the like in the specification and claims of the present application and the above description of drawings are used to distinguish different objects, not to describe a particular order or primary and secondary relationship.

[0052] In the present application, the phrase "embodiment" means that the specific features, structures or characteristics described in conjunction with the embodiment can be included in at least one embodiment of the present application. The appearance of this phrase at various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in the present application can be combined with other embodiments.

[0053] In the description of the application, it should be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "attachment" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be directly connected, or indirectly connected through intermediate medium, or internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0054] The term "and / or" in the application is only to describe the association relationship of the associated objects, which means that there can be three kinds of relationships, for example, A and / or B can mean that there are A, A and B exist at the same time, and B exist in three cases. In addition, the character " / " in the application generally represents that the front and rear associated objects are a "or" relationship.

[0055] "Multiple" appearing in the application refers to more than two (including two), and similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0056] In the application, the battery referred to refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in the application can include a battery module or a battery pack, etc.

[0057] In the application, the battery cell can include a lithium ion secondary battery, a lithium ion primary battery, a lithium-sulfur battery, a sodium lithium ion battery, a sodium ion battery, or a magnesium ion battery, etc., and the embodiments of the application are not limited thereto.

[0058] The battery referred to in the embodiments of the application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in the application can include a battery module or a battery pack, etc. The battery generally includes a box for packaging one or more battery cells. The box can avoid the influence of liquid or other foreign matters on the charging or discharging of the battery cell.

[0059] The battery cell includes an electrode assembly and an electrolyte, and the electrode assembly is composed of a positive electrode tab, a negative electrode tab and a separator. The battery cell mainly relies on the movement of metal ions between the positive electrode tab and the negative electrode tab to work. The positive electrode tab includes a positive electrode current collector and a positive electrode active material layer, and the positive electrode active material layer is coated on the surface of the positive electrode current collector. The current collector without the positive electrode active material layer protrudes from the current collector with the positive electrode active material layer, and the current collector without the positive electrode active material layer serves as a positive electrode tab. Taking a lithium ion battery as an example, the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobaltate, lithium iron phosphate, ternary lithium or lithium manganate, etc. The negative electrode tab includes a negative electrode current collector and a negative electrode active material layer, and the negative electrode active material layer is coated on the surface of the negative electrode current collector. The current collector without the negative electrode active material layer protrudes from the current collector with the negative electrode active material layer, and the current collector without the negative electrode active material layer serves as a negative electrode tab. The material of the negative electrode current collector can be copper, and the negative electrode active material can be carbon or silicon, etc. In order to ensure that no fuse occurs when passing a large current, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together. The material of the separator can be PP (polypropylene) or PE (polyethylene), etc.

[0060] The overcurrent capacity of the battery cell depends on the one with lower overcurrent capacity among the positive electrode tab and the negative electrode tab of the electrode assembly. For example, the overcurrent capacity of the negative electrode tab is lower than that of the positive electrode tab, and the overcurrent capacity of the negative electrode tab determines the overall overcurrent capacity of the battery cell.

[0061] In the process of battery manufacturing, considering the cost and material performance, the material of the negative electrode current collector is usually copper, the overcurrent capacity of copper is 8A / mm 2 , and the thickness of the negative electrode current collector is generally 4.5-10μm. The material of the positive electrode current collector is usually aluminum, the overcurrent capacity of aluminum is 5A / mm 2The thickness of the positive current collector is generally 10-20 μm, and the thickness of the negative current collector is generally lower than that of the positive current collector. In general, the width of the negative tab of the negative electrode sheet is the same as the width of the positive tab of the positive electrode sheet. The negative tab may have insufficient current-carrying capacity, while the positive tab has good current-carrying capacity and is even redundant. The overall current-carrying capacity of the battery cell depends on the current-carrying capacity of the negative tab with lower current-carrying capacity. The insufficient current-carrying capacity of the negative tab limits the use of the battery cell and causes a series of safety problems. For example, insufficient current-carrying capacity of the battery cell affects the charge-discharge rate of the battery cell, resulting in a low charge-discharge rate of the battery cell. In the case of capacity rating of the battery cell, the low current-carrying capacity of the battery cell results in a low output power of the battery cell. For another example, in the case of low current-carrying capacity of the battery cell, when the charge-discharge current is too large, the battery cell is prone to generate excessive heat, resulting in rupture, leakage, smoke, and even explosion of the battery cell, causing safety problems. Therefore, insufficient current-carrying capacity of the battery cell affects the performance (such as charge-discharge rate, safety, output power, etc.) of the battery cell.

[0062] In view of this, in order to solve the problem of insufficient current-carrying capacity of the battery cell, the inventors have conducted in-depth research and designed an electrode assembly. By increasing the width of the negative tab, the width of the negative tab is greater than the width of the positive tab, the current-carrying capacity of the negative tab is improved, and the overall current-carrying capacity of the battery cell assembled by the electrode assembly is improved.

[0063] Compared with the electrode assembly composed of positive tabs and negative tabs with the same width, in the electrode assembly of the present application, the width of the negative tab is increased, and the width of the negative tab is greater than the width of the positive tab, so that the current-carrying area of the negative tab is increased, the current-carrying capacity of the negative tab is improved, and in the case that the current-carrying capacity of the original positive tab is unchanged or slightly decreased, the difference between the current-carrying capacity of the negative tab and the current-carrying capacity of the positive tab is reduced, the current-carrying capacity of the negative tab with weaker current-carrying capacity in the electrode assembly is improved, and the overall current-carrying capacity of the battery cell assembled by the electrode assembly is improved.

[0064] The battery cell disclosed in the embodiments of the present application can be used in, but is not limited to, an electric device such as a vehicle, a ship, or an aircraft. A power supply system of the electric device can be composed of the battery cell and the like disclosed in the present application.

[0065] The embodiments of the present application provide an electric device using a battery as a power supply. The electric device can be, but is not limited to, a mobile phone, a tablet computer, a notebook computer, an electric toy, an electric tool, an electric bicycle, an electric motorcycle, an electric vehicle, a ship, a spacecraft, and the like. The electric toy can include a fixed or mobile electric toy, such as a game console, an electric vehicle toy, an electric ship toy, an electric aircraft toy, and the like. The spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, and the like.

[0066] The following embodiments are described by taking a vehicle as an example of a power consumption device in an embodiment of the present application.

[0067] Please refer to Figure 1 , Figure 1 A structural schematic diagram of a vehicle 1000 is provided for some embodiments of the present application. The vehicle 1000 can be a fuel automobile, a gas automobile, or a new energy automobile, which can be a pure electric vehicle, a hybrid electric vehicle, or a range extended electric vehicle, etc. The vehicle 1000 is internally provided with a battery 100, which can be arranged at the bottom, the head, or the tail of the vehicle 1000. The battery 100 can be used for power supply of the vehicle 1000, for example, the battery 100 can be used as an operating power source of the vehicle 1000, for example, for the power demand of the circuit system of the vehicle 1000, such as the power demand for starting, navigation, and operation of the vehicle 1000.

[0068] The vehicle 1000 can further include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to supply power to the motor 300, for example, for the power demand of the vehicle 1000 during starting, navigation, and driving.

[0069] In some embodiments of the present application, the battery 100 can not only be used as an operating power source of the vehicle 1000, but also be used as a driving power source of the vehicle 1000, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle 1000.

[0070] Please refer to Figure 2 , Figure 2 A structural schematic diagram of the battery 100 is provided for some embodiments of the present application. The battery 100 includes a box body 10 and a battery cell 1, and the battery cell 1 is accommodated in the box body 10. The box body 10 is used to provide an accommodation space for the battery cell 1, and the box body 10 can adopt various structures. In some embodiments, the box body 10 can include a first part 101 and a second part 102, and the first part 101 and the second part 102 are mutually covered, and the first part 101 and the second part 102 jointly define an accommodation space for accommodating the battery cell 1. The second part 102 can be a hollow structure with one end open, and the first part 101 can be a plate-shaped structure, and the first part 101 is covered on the open side of the second part 102 to jointly define the accommodation space with the second part 102; the first part 101 and the second part 102 can also be hollow structures with one side open, and the open side of the first part 101 is covered on 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 various shapes, such as a cylinder, a cuboid, etc.

[0071] In the battery 100, the battery cell 1 can be multiple, and the multiple battery cells 1 can be connected in series, in parallel, or in a mixed connection, where the mixed connection means that the multiple battery cells 1 are connected in series and in parallel. The multiple battery cells 1 can be directly connected in series, in parallel, or in a mixed connection, and the whole of the multiple battery cells 1 is accommodated in the case 10; of course, the battery 100 can also be that the multiple battery cells 1 are first connected in series, in parallel, or in a mixed connection to form a battery module, and the multiple battery modules 100 are connected in series, in parallel, or in a mixed connection to form a whole, and are accommodated in the case 10. The battery 100 can also include other structures, for example, the battery 100 can also include a current collecting component for realizing the electrical connection between the multiple battery cells 1.

[0072] Each battery cell 1 can be a secondary battery or a primary battery. The battery cell 1 can be in the shape of a cylinder, a flat body, a cuboid, or other shapes, and the embodiments of the present application are introduced by taking the battery cell 1 in the shape of a cuboid as an example.

[0073] Please refer to Figure 3 , Figure 3 The exploded structural schematic diagram of the battery cell 1 provided by some embodiments of the present application is shown. The battery cell 1 refers to the smallest unit that constitutes the battery 100. As Figure 3 , the battery cell 1 includes a shell 11, an electrode assembly 12, and other functional components.

[0074] The shell 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, the electrolyte, and other components. The shell 11 can include a shell body 111 and an end cover 112, and the shell body 111 and the end cover 112 can be independent components, or an opening can be provided on the shell body 111, and the end cover 112 is used to cover the opening to form the internal environment of the battery cell 1. Without limitation, the end cover 112 and the shell body 111 can also be integrated, specifically, the end cover 112 and the shell body 111 can form a common connecting surface before other components enter the shell, and when it is necessary to seal the inside of the shell body 111, the end cover 112 is used to cover the shell body 111. The shell body 111 can be in the shape of a cuboid. Specifically, the shape of the shell body 111 can be determined according to the specific shape and size of the electrode assembly 12. The material of the shell body 111 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc., and the embodiments of the present application do not make special limitations thereon. The shell body of the embodiments of the present application is a conductive component.

[0075] The end cover 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 cover 112 can be adapted to the shape of the shell 111 to fit the shell 111. Optionally, the end cover 112 can be made of a material with certain hardness and strength, such as aluminum alloy, so that the end cover 112 is less likely to deform when subjected to extrusion collision, allowing the battery cell 1 to have higher structural strength and improved safety performance. The end cover 112 can be provided with functional components such as the electrode terminal 13. The electrode terminal 13 can be used to electrically connect with the electrode assembly 12 for outputting or inputting the electrical energy of the battery cell 1. In some embodiments, the end cover 112 can also be provided with a pressure relief mechanism for relieving the internal pressure of the battery cell 1 when the internal pressure or temperature reaches a threshold value. The material of the end cover 112 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. In some embodiments, an insulating member can also be provided on the inner side of the end cover 112, which can be used to isolate the electrical connection components in the shell 111 from the end cover 112 to reduce the risk of short circuit. Exemplarily, the insulating member can be plastic, rubber, etc.

[0076] The electrode assembly 12 is a component in which electrochemical reactions occur in the battery cell 1. One or more electrode assemblies 12 can be contained in the shell 111. The electrode assembly 12 is mainly formed by winding or stacking the 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 having active materials and the separator, and the parts of the positive and negative electrode sheets not having active materials each constitute a tab. The positive and negative tabs can be located at the two ends of the body, respectively. During the charging and discharging process of the battery 100, the positive and negative active materials react with the electrolyte, and the tabs are connected to the electrode terminal 13 through the connecting component 14 to form a current loop.

[0077] The electrode terminal 13 is provided on the shell 11, and the electrode terminal 13 is electrically connected to the electrode assembly 12 through the connecting component 14 for outputting or inputting the electrical energy of the battery cell 1. The electrode terminal 13 usually includes a positive electrode terminal and a negative electrode terminal, and the positive electrode terminal is electrically connected to the positive tab, and the negative electrode terminal is electrically connected to the negative tab.

[0078] The battery cell 1 according to the embodiments of the present application is taken as a square battery cell as an example for introduction.

[0079] Please refer to Figure 4 , Figure 4 The structure of the electrode assembly 12 provided in some embodiments of the present application is shown in the figure, in which the positive tab 1212 and the negative tab 1222 are in an unfolded state.

[0080] According to some embodiments of the present application, such as Figure 4As shown, the application provides an electrode assembly 12. The electrode assembly 12 includes a positive electrode tab 121 and a negative electrode tab 122. The positive electrode tab 121 includes a positive electrode tab body 1211 and a positive electrode ear 1212 protruding from the positive electrode tab body 1211. The negative electrode tab 122 includes a negative electrode tab body 1221 and a negative electrode ear 1222 protruding from the negative electrode tab body 1221. The width L1 of the negative electrode ear 1222 is greater than the width L2 of the positive electrode ear 1212.

[0081] In the embodiment of the application, the material of the positive electrode tab 121 can be aluminum, and the material of the negative electrode tab 122 can be copper.

[0082] The positive electrode ear 1212 is a part of the positive electrode tab 121 for electrically connecting with the positive electrode terminal 131, and the negative electrode ear 1222 is a part of the negative electrode tab 122 for electrically connecting with the negative electrode terminal 132.

[0083] In the figure, the letter L1 indicates the width of the negative electrode ear 1222, and the letter L2 indicates the width of the positive electrode ear 1212. The width of the electrode ear refers to the length dimension of the electrode ear in the direction of the edge protruding from the electrode tab 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 of the electrode tab in the width direction, the width of the electrode ear refers to the dimension of the electrode ear in the length direction of the electrode tab; or if the electrode ear protrudes from the edge of the electrode tab in the length direction, the width of the electrode ear refers to the dimension of the electrode ear in the width direction of the electrode tab. For example, Figure 4 As shown, taking the electrode assembly 12 as a laminated electrode assembly, in order to meet the energy density of the battery monomer 1, the electrode ear protrudes from the edge of the electrode tab in the length direction, the width direction of the electrode ear is consistent with the width direction of the electrode tab, and the width of the electrode ear is the dimension of the electrode ear in the width direction of the electrode tab.

[0084] The width L1 of the negative electrode ear 1222 being greater than the width L2 of the positive electrode ear 1212 means that the length dimension of the negative electrode ear 1222 in the extension direction of the edge protruding from the negative electrode tab body 1221 is L1, the length dimension of the positive electrode ear 1212 in the extension direction of the edge protruding from the positive electrode tab body 1211 is L2, and L1>L2 is satisfied.

[0085] According to the electrode assembly 12 provided by the embodiment of the present application, compared with the electrode assembly 12 composed of the negative tab 1222 and the positive tab 1212 with equal width, the width of the negative tab 1222 is increased, and the width of the negative tab 1222 is greater than the width of the positive tab 1212, so that the flow area of the negative tab 1222 is increased, and the flow capacity of the negative tab 1222 is improved. In the case that the flow capacity of the positive tab 1212 is unchanged or slightly decreased, the difference between the flow capacity of the negative tab 1222 and the flow capacity of the positive tab 1212 is reduced, the flow capacity of the negative tab 1222 which is weaker in the electrode assembly 12 is improved, and thus the overall flow capacity of the battery cell assembled by the electrode assembly 12 is improved.

[0086] According to some embodiments of the present application, optionally, the negative tab 1222 comprises a plurality of sub-tabs, and the sum of the widths of the plurality of sub-tabs is greater than the width of the positive tab 1212.

[0087] The negative tab 1222 comprises a plurality of sub-tabs, and the sum of the widths of the plurality of sub-tabs constitutes the width of the negative tab 1222. In other words, the sum of the electric energy of the plurality of sub-tabs is the electric energy of the negative tab 1222, and the export or import of the negative electric energy is realized through the plurality of sub-tabs.

[0088] The sum of the widths of the plurality of sub-tabs is greater than the width of the positive tab 1212, and the width of the negative tab 1222 is increased by setting the plurality of sub-tabs to realize the improvement of the flow capacity of the negative tab 1222, which is convenient for processing and manufacturing.

[0089] According to some embodiments of the present application, optionally, the number of the positive tab 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 plurality of sub-tabs is greater than the sum of the widths of the multiple positive tabs 1212.

[0090] The number of the positive tab 1212 is multiple to meet the flow capacity requirement of the positive tab 1212, and it is convenient to realize the setting of the positive tab 1212 at different positions to avoid the interference between components.

[0091] Please refer to Figure 5 and Figure 6 , Figure 5 the structural schematic view of the negative tab of the electrode assembly provided by some embodiments of the present application, Figure 6 the structural schematic view of the positive tab of the electrode assembly provided by some embodiments of the present application.

[0092] According to some embodiments of the present application, optionally, as Figure 5As shown, the plurality of sub-tab includes a first sub-tab 1222a and a second sub-tab 1222b, the first sub-tab 1222a protrudes from a first edge 1221a of the negative tab body 1221, and the second sub-tab 1222b protrudes from a second edge 1221b of the negative tab body 1221.

[0093] The first sub-tab 1222a protrudes from the first edge 1221a of the negative tab body 1221, and the second sub-tab 1222b protrudes from the second edge 1221b of the negative tab body 1221, in other words, the first sub-tab 1222a and the second sub-tab 1222b protrude from two edges of the negative tab body 1221 respectively.

[0094] In the figure, the letter L11 indicates the width of the first sub-tab 1222a, and the letter L12 indicates the width of the second sub-tab 1222b. The width L11 of the first sub-tab 1222a is the length dimension of the first sub-tab 1222a in the extension direction of the first edge 1221a, and the width L12 of the second sub-tab 1222b is the length dimension of the second sub-tab 1222b in the extension direction of the second edge 1221b. For example, as shown in the figure, the first edge 1221a and the second edge 1221b can be two opposite edges of the negative tab body 1221, both the first edge 1221a and the second edge 1221b extend along the width direction of the negative tab 122, the width L11 of the first sub-tab 1222a is the length dimension of the first sub-tab 1222a in the width direction of the negative tab 122, and the width L12 of the second sub-tab 1222b is the length dimension of the second sub-tab 1222b in the width direction of the negative tab 122. For another example, the first edge 1221a and the second edge 1221b can be two adjacent edges of the negative tab body 1221, the first edge 1221a extends along the width direction of the negative tab 122, and the second edge 1221b extends along the length direction of the negative tab 122, the width L11 of the first sub-tab 1222a is the length dimension of the first sub-tab 1222a in the width direction of the negative tab 122, and the width L12 of the second sub-tab 1222b is the length dimension of the second sub-tab 1222b in the length direction of the negative tab 122. Figure 5 As shown, the first edge 1221a and the second edge 1221b can be two opposite edges of the negative tab body 1221, both the first edge 1221a and the second edge 1221b extend along the width direction of the negative tab 122, the width L11 of the first sub-tab 1222a is the length dimension of the first sub-tab 1222a in the width direction of the negative tab 122, and the width L12 of the second sub-tab 1222b is the length dimension of the second sub-tab 1222b in the width direction of the negative tab 122. For another example, the first edge 1221a and the second edge 1221b can be two adjacent edges of the negative tab body 1221, the first edge 1221a extends along the width direction of the negative tab 122, and the second edge 1221b extends along the length direction of the negative tab 122, the width L11 of the first sub-tab 1222a is the length dimension of the first sub-tab 1222a in the width direction of the negative tab 122, and the width L12 of the second sub-tab 1222b is the length dimension of the second sub-tab 1222b in the length direction of the negative tab 122.

[0095] The sum of the width L11 of the first sub-tab 1222a and the width L12 of the second sub-tab 1222b is greater than the width L2 of the positive tab ear 1212 (see Figure 6 ), that is, L11+L12>L2.

[0096] The first sub-tab 1222a protrudes from a first edge 1221a of the negative tab body 1221, and the second sub-tab 1222b protrudes from a second edge 1221b of the negative tab body 1221. The first edge 1221a and the second edge 1221b are two different edges of the negative tab body 1221, so that the first sub-tab 1222a and the second sub-tab 1222b are reasonably arranged, and interference between components is avoided.

[0097] When the first sub-tab 1222a protrudes from the first edge 1221a and the second sub-tab 1222b protrudes from the second edge 1221b, under the premise that the negative tab 1222 does not interfere with the positive tab 1212, the width L11 of the first sub-tab 1222a can be the same as the length of the first edge 1221a, or the width L12 of the second sub-tab 1222b can be the same as the length of the second edge 1221b, or the width L11 of the first sub-tab 1222a can be the same as the length of the first edge 1221a and the width L12 of the second sub-tab 1222b can be the same as the length of the second edge 1221b.

[0098] According to some embodiments of the present application, optionally, as shown in Figure 5 The first edge 1221a and the second edge 1221b are two opposite edges of the negative tab body 1221.

[0099] The first edge 1221a and the second edge 1221b are two opposite edges of the negative tab body 1221 along a first direction. The first direction can be the direction in which the electrode assembly 12 enters the shell when the electrode assembly 12 is assembled with the shell.

[0100] The first edge 1221a and the second edge 1221b are arranged opposite to each other, which facilitates reasonable allocation of assembly space, reduces space occupation, ensures that the battery monomer 1 assembled by the electrode assembly 12 has a compact structure, and ensures that the battery monomer 1 has a high energy density.

[0101] Please refer to Figure 7 , Figure 7 for a structural schematic diagram of the electrode assembly 12 provided by another embodiment of the present application. According to some embodiments of the present application, optionally, as shown in Figure 7 The first sub-tab 1222a is located at one end of the electrode assembly 12, and the second sub-tab 1222b and the positive tab 1212 are located at the other end of the electrode assembly 12.

[0102] The first sub-tab 1222a and the positive tab 1212 are respectively located at opposite ends of the electrode assembly 12. The width L11 of the first sub-tab 1222a can be set to be relatively wide, for example, the width L11 of the first sub-tab 1222a can be the length of the first edge 1221a.

[0103] The second sub-tab 1222b and the positive tab 1212 are located at the other end of the electrode assembly 12, i.e., the second sub-tab 1222b and the positive tab 1212 are located at the same end of the electrode assembly 12. Since the tabs are multi-layer structures, the multi-layer second sub-tab 1222b and the multi-layer positive tab 1212 do not interfere with each other to avoid internal short circuit.

[0104] In the embodiment in which the electrode assembly 12 is a jelly-roll type electrode assembly, the second sub-tab 1222b and the positive tab 1212 can be located on both sides of the thickness direction (i.e., the stacking direction of the tabs) of the electrode assembly 12, respectively. In the thickness direction of the electrode assembly 12, the projection of the second sub-tab 1222b and the projection of the positive tab 1212 can overlap or not overlap, as long as the second sub-tab 1222b and the positive tab 1212 do not contact. In the embodiment in which the electrode assembly 12 is a stacked type electrode assembly, as shown in FIG. 1B, in the thickness direction of the electrode assembly 12, the projection of the second sub-tab 1222b and the projection of the positive tab 1212 do not overlap to avoid contact between the second sub-tab 1222b and the positive tab 1212. Figure 7

[0105] The second sub-tab 1222b and the positive tab 1212 are located at the same end of the electrode assembly 12, which reasonably utilizes the assembly space, reduces the space occupation, makes the battery monomer structure compact after the electrode assembly 12 is assembled, and ensures that the battery monomer has a high energy density.

[0106] According to some embodiments of the present application, optionally, the width L11 of the first sub-tab 1222a is greater than the width L12 of the second sub-tab 1222b.

[0107] The first sub-tab 1222a and the second sub-tab 1222b protrude from two edges of the negative tab body 1221, respectively. The length of the first sub-tab 1222a on the first edge 1221a can be determined according to the length of the first edge 1221a. In the limit case, the width L11 of the first sub-tab 1222a is the same as the length of the first edge 1221a.

[0108] In the embodiment in which the second sub-tab 1222b and the positive tab 1212 are located at the same end of the electrode assembly 12, the width L11 of the first sub-tab 1222a is greater than the width L12 of the second sub-tab 1222b. On the premise that the second sub-tab 1222b and the positive tab 1212 do not interfere with each other, increasing the width L11 of the first sub-tab 1222a can ensure that the sum of the widths of the first sub-tab 1222a and the second sub-tab 1222b is greater than the width L2 of the positive tab 1212.

[0109] ​The width L11 of the first sub-tab 1222a is greater than the width L12 of the second sub-tab 1222b, which allows the first sub-tab 1222a to have a longer extension width at the first edge 1221a. In fact, the width L11 of the first sub-tab 1222a can be the same as the length of the first edge 1221a. On the one hand, this makes it easier to achieve a larger flow area for the negative tab 1222, and on the other hand, it facilitates processing.

[0110] According to some embodiments of this application, optionally, such as Figure 7 As shown, the width L11 of the first sub-tab 1222a is greater than the width L2 of the positive tab 1212.

[0111] If the width L11 of the first sub-electrode 1222a is greater than the width L2 of the positive electrode 1212, then the sum of the widths of the first sub-electrode 1222a and the second sub-electrode 1222b must be greater than the width L2 of the positive electrode 1212. The width L12 of the second sub-electrode 1222b can be determined according to the assembly space of the electrode assembly 12.

[0112] When the negative electrode tab 1222 requires a large current carrying capacity, the width L12 of the second sub-tab 1222b can be larger, so that the negative electrode tab 1222 has a larger width, increasing the current carrying area of ​​the negative electrode tab 1222 and improving the current carrying capacity of the negative electrode tab 1222.

[0113] The width L11 of the first sub-tab 1222a is greater than the width L2 of the positive tab 1212, ensuring that the sum of the widths of the first sub-tab 1222a and the second sub-tab 1222b is greater than the width L2 of the positive tab 1212, ensuring that the negative tab 1222 has a larger current carrying capacity, and even the current carrying capacity of the negative tab 1222 can be greater than that of the positive tab 1212, thereby improving the overall current carrying capacity of the battery cell assembled in the electrode assembly 12.

[0114] According to some embodiments of this application, optionally, such as 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.

[0115] The width L2 of the positive electrode tab 1212 is greater than the width L12 of the second sub-electrode tab 1222b, ensuring that the positive electrode tab 1212 has a wider width and a larger current-carrying area, so as to ensure that the positive electrode tab 1212 has a larger current-carrying capacity.

[0116] The second sub-tab 1222b protrudes from the second edge 1221b of the negative electrode 122. The positive electrode 1212 and the second sub-tab 1222b can be located at the same end of the electrode assembly 12 or at different ends of the electrode assembly 12.

[0117] In an embodiment where the first sub-tab 1222a is located at one end of the electrode assembly 12, and the second sub-tab 1222b and the positive tab 1212 are located at the other end of the electrode assembly 12, as follows: Figure 7 As shown, the first sub-tab 1222a and the positive tab 1212 are located at the two ends of the electrode assembly 12, respectively. The width L2 of the positive tab 1212 is greater than the width L12 of the second sub-tab 1222b, so that the width L11 of the first sub-tab 1222a can be wider, so that the sum of the widths of the first sub-tab 1222a and the second sub-tab 1222b is greater than the width L2 of the positive tab 1212.

[0118] According to some embodiments of this application, the electrode assembly 12 may optionally be a stacked electrode assembly.

[0119] Stacked electrode assemblies have advantages such as relatively uniform current density distribution and excellent internal heat dissipation.

[0120] When the electrode assembly 12 is a stacked electrode assembly, the width of the electrode at the edge of the corresponding electrode body can be the same as the length of that edge. For example, in an embodiment where the negative electrode tab 1222 includes a first sub-tab 1222a and a second sub-tab 1222b, the width L11 of the first sub-tab 1222a can be the same as the length of the first edge 1221a; or, the width L11 of the first sub-tab 1222a can be the same as the length of the first edge 1221a, and the width L12 of the second sub-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 body 1211.

[0121] Optionally, such as Figure 5 As shown, the width L11 of the first sub-taper 1222a is the same as the length of the first edge 1221a.

[0122] The stacked electrode assembly features convenient electrode tab processing, high assembly precision, and good heat dissipation.

[0123] Please see Figures 8 to 10 , Figure 8 This is an exploded structural diagram of the battery cell 1 provided in other embodiments of this application. Figure 9 This is an exploded structural diagram of battery cell 1 provided in some embodiments of this application. Figure 10 This is an exploded structural diagram of a battery cell 1 provided in some embodiments of this application.

[0124] According to some embodiments of this application, such as Figures 8 to 10 As shown, this application also provides a battery cell 1, including a housing 11 and an electrode assembly 12 as described above, the electrode assembly 12 being disposed inside the housing 11.

[0125] The shell 11 is used to protect the electrode assembly 12, and has a space inside for accommodating the electrode assembly 12. The shell 11 generally has high strength, improving the safety performance of the battery cell 1.

[0126] According to the battery cell 1 provided by the embodiment of the present application, the electrode assembly 12 is arranged in the shell 11, the width of the negative tab 1222 is greater than the width of the positive tab 1212, the overcurrent capacity of the negative tab 1222 is increased, so that the overall overcurrent capacity of the battery cell 1 is improved, and the battery cell 1 has a large overcurrent capacity.

[0127] According to some embodiments of the present application, as shown in Figure 8 The present application also provides a battery cell 1, which comprises a shell 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 in the shell 11, and the first negative terminal 132a and the second negative terminal 132b are arranged in the shell 11. The electrode assembly 12 is arranged in the shell 11, the positive tab 1212 is electrically connected to the positive terminal 131, the first sub-tab 1222a is electrically connected to the first negative terminal 132a, and the second sub-tab 1222b is electrically connected to the second negative terminal 132b.

[0128] The shell 11 can comprise a shell body 111 and end covers 112, the shell body 111 can have an open structure at both ends, and the number of end covers 112 can be two, two end covers 112 are arranged at the two openings of the shell body 111 respectively, and the end covers 112 are sealingly connected to the shell body 111. For example, as shown in Figure 8 The two openings are located at opposite ends of the shell body 111, and the two end covers 112 are arranged oppositely.

[0129] The first negative terminal 132a can be arranged in one end cover 112, and the second negative terminal 132b and the positive terminal 131 can be arranged in the other end cover 112. The end cover 112 can be electrically connected to the shell body 111, or can be insulatedly connected.

[0130] Optionally, as shown in Figure 8 The two end covers 112 are a first sub-end cover 1121 and a second sub-end cover 1122 respectively, the first negative terminal 132a is arranged in the first sub-end cover 1121, the second negative terminal 132b and the positive terminal 131 are arranged in the second sub-end cover 1122, the first sub-tab 1222a is electrically connected to the first negative terminal 132a through a first sub-connection component 141, the second sub-tab 1222b is electrically connected to the second negative terminal 132b through a second sub-connection component 142, and the positive tab 1212 is electrically connected to the positive terminal 131 through a third sub-connection component 143.

[0131] According to the battery cell 1 provided by the embodiment of the present application, the width of the negative tab 1222 is greater than the width of the positive tab 1212, the positive electrode energy is led out through the positive terminal 131, the negative electrode energy is led out through the first negative terminal 132a and the second negative terminal 132b, and meanwhile, the width of the negative tab 1222 is greater than the width of the positive tab 1212, the overcurrent capacity of the negative tab 1222 is increased, so that the battery cell 1 has a higher overcurrent capacity.

[0132] According to some embodiments of the present application, the present application further provides a battery cell 1, as shown in Figure 9 and Figure 10 the battery cell 1 comprises an outer shell 11, a positive terminal 131, a negative terminal 132 and the electrode assembly 12 described in the above solutions. The positive terminal 131 is arranged in the outer shell 11 and is mutually insulated from the outer shell 11. The negative terminal 132 is arranged in the outer shell 11 and is electrically connected with the outer shell 11. The electrode assembly 12 is arranged in the outer shell 11, the positive tab 1212 is electrically connected with the positive terminal 131, one of the first sub-tab 1222a and the second sub-tab 1222b is electrically connected with the negative terminal 132, and the other is electrically connected with the outer shell 11.

[0133] The outer shell 11 can comprise a shell body 111 and end covers 112, the shell body 111 can be a structure with both ends open, and the number of the end covers 112 can be two, the two end covers 112 are respectively covered on the two opening places of the shell body 111, and the end covers 112 are sealingly connected with the shell body 111. For example, as shown in Figure 9 and Figure 10 the two openings are located at opposite ends of the shell body 111, and the two end covers 112 are arranged oppositely. The end covers 112 are electrically connected with the shell body 111.

[0134] The positive terminal 131 is arranged in the outer shell 11 and is mutually insulated from the outer shell 11, the positive terminal 131 can be arranged in one end cover 112, and the positive terminal 131 is mutually insulated from the end cover 112, so as to facilitate leading out or leading in the positive electrode energy.

[0135] One of the first sub-tab 1222a and the second sub-tab 1222b is electrically connected with the negative terminal 132, and the other is electrically connected with the outer shell 11, which can be that the first sub-tab 1222a is electrically connected with the negative terminal 132, and the second sub-tab 1222b is electrically connected with the outer shell 11, or that the first sub-tab 1222a is electrically connected with the outer shell 11, and the second sub-tab 1222b is electrically connected with the negative terminal 132. Since the negative terminal 132 is arranged in the outer shell 11 and is electrically connected with the outer shell 11, the first sub-tab 1222a and the second sub-tab 1222b are connected in series.

[0136] Optionally, as shown in Figure 9 the two end covers 112 are respectively a first sub-end cover 1121 and a second sub-end cover 1122, the first sub-tab 1222a is electrically connected with the first sub-end cover 1121 through a first sub-connection component 141, the negative electrode terminal 132 and the positive electrode terminal 131 are arranged on the second sub-end cover 1122, the second sub-tab 1222b is electrically connected with the negative electrode terminal 132 through a second sub-connection component 142, and the positive electrode tab 1212 is electrically connected with the positive electrode terminal 131 through a third sub-connection component 143.

[0137] Optionally, as shown in Figure 10 the two end covers 112 are respectively a first sub-end cover 1121 and a second sub-end cover 1122, the negative electrode terminal 132 is arranged on the first sub-end cover 1121 and electrically connected with the first sub-end cover 1121, the positive electrode terminal 131 is arranged on the second sub-end cover 1122 and mutually insulated with the second sub-end cover 1122, the first sub-tab 1222a is electrically connected with the negative electrode terminal 132 through the first sub-connection component 141, the second sub-tab 1222b is electrically connected with the second sub-end cover 1122 through the second sub-connection component 142, and the positive electrode tab 1212 is electrically connected with the positive electrode terminal 131 through the third sub-connection component 143.

[0138] According to the battery monomer 1 of the embodiment of the application, since the negative electrode tab 1222 includes the first sub-tab 1222a and the second sub-tab 1222b, the negative electrode tab 1222 is electrically connected with the negative electrode terminal 132 and the shell 11 respectively through the first sub-tab 1222a and the second sub-tab 1222b, and the negative electrode terminal 132 is electrically connected with the shell 11, the negative electrode electric energy of the electrode assembly 12 is converged to the negative electrode terminal 132 and is led out, so as to facilitate the electrical connection with other components (such as the battery monomer 1), and meanwhile, the width of the negative electrode tab 1222 is greater than the width of the positive electrode tab 1212, the overcurrent capacity of the negative electrode tab 1222 is increased, so that the battery monomer 1 has higher overcurrent capacity.

[0139] According to some embodiments of the application, the application further provides a battery 100, comprising the battery monomer 1 described in the above-mentioned scheme.

[0140] According to some embodiments of the application, the application further provides a power consumption device, comprising the battery 100 described in the above-mentioned scheme, and the battery 100 is used for providing electric energy for the power consumption device.

[0141] The power consumption device can be the device or system of any one of the above-mentioned application batteries 100.

[0142] According to some embodiments of the application, referring to Figures 3 to 10The battery cell 1 provided in the present application includes a shell 11 and an electrode assembly 12, and the electrode assembly 12 is arranged in the shell 11. The electrode assembly 12 is a laminated electrode assembly, and 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 tab 1212, and the positive electrode tab 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 tab 1222, and the negative electrode tab 1222 protrudes from the negative electrode sheet body 1221. The negative electrode tab 1222 includes a first sub-tab 1222a and a second sub-tab 1222b. The first sub-tab 1222a protrudes from a first edge 1221a of the negative electrode sheet body 1221, and the second sub-tab 1222b protrudes from a second edge 1221b of the negative electrode sheet body 1221. The first sub-tab 1222a is located at one end of the electrode assembly 12, and the second sub-tab 1222b and the positive electrode tab 1212 are located at the other end of the electrode assembly 12. The sum of the widths of the first sub-tab 1222a and the second sub-tab 1222b is greater than the width of the positive electrode tab 1212. The width of the first sub-tab 1222a is the same as the length of the first edge 1221a.

[0143] According to the battery cell 1 provided in the present application, the width of the negative electrode tab 1222 is increased, so that the negative electrode tab 1222 has a larger flow area, the flow capacity of the negative electrode tab 1222 is improved, and thus the battery cell 1 has a higher flow capacity.

[0144] Figure 11 A schematic flowchart of a manufacturing method of the battery cell 1 of some embodiments of the present application is shown. According to some embodiments of the present application, as shown in Figure 11 The present application also provides a manufacturing method of a battery cell 1, which includes:

[0145] S401, providing a shell 11;

[0146] S402, providing an electrode assembly 12, and 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 tab 1212, and the positive electrode tab 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 tab 1222, and the negative electrode tab 1222 protrudes from the negative electrode sheet body 1221. The width of the negative electrode tab 1222 is greater than the width of the positive electrode tab 1212;

[0147] S403, placing the electrode assembly 12 into the shell 11.

[0148] In the above steps, the sequence of the step "S401, providing the shell 11" and the step "S402, providing the electrode assembly 12" is not limited. The step "S401, providing the shell 11" can be performed first, and then the step "S402, providing the electrode assembly 12" can be performed. Alternatively, the step "S402, providing the electrode assembly 12" can be performed first, and then the step "S401, providing the shell 11" can be performed.

[0149] Figure 12 A schematic block diagram of a battery cell manufacturing apparatus 500 is shown to illustrate some embodiments of the present application. According to some embodiments of the present application, as shown in Figure 12 The present application also provides a battery cell manufacturing apparatus 500, which includes a providing module 501 and an assembling module 502. The providing module 501 is configured to provide a shell 11 and an electrode assembly 12. The electrode assembly 12 includes a positive electrode tab 121 and a negative electrode tab 122. The positive electrode tab 121 includes a positive electrode tab body 1211 and a positive electrode ear 1212, and the positive electrode ear 1212 protrudes from the positive electrode tab body 1211. The negative electrode tab 122 includes a negative electrode tab body 1221 and a negative electrode ear 1222, and the negative electrode ear 1222 protrudes from the negative electrode tab body 1221. The width of the negative electrode ear 1222 is greater than the width of the positive electrode ear 1212. The assembling module 502 is configured to place the electrode assembly 12 into the shell 11.

[0150] Although the present application has been described with reference to the preferred embodiments, various modifications can be made to the present application without departing from the scope of the present application, and equivalent parts can be substituted therefor. In particular, the technical features mentioned in each of the embodiments can be combined in any manner as long as there is no structural conflict. 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; The positive terminal is disposed in the housing and is insulated from the housing; The negative terminal is disposed in the housing; as well as An electrode assembly, disposed within the housing, comprises: A positive electrode plate includes a positive electrode plate body and a positive electrode tab, wherein the positive electrode tab protrudes from the positive electrode plate body; A negative electrode sheet includes a negative electrode sheet body and a negative electrode tab, wherein the negative electrode tab protrudes from the negative electrode sheet body; The width of the negative electrode tab is greater than the width of the positive electrode tab; The negative electrode tab includes multiple sub-electrodes, and the sum of the widths of the multiple sub-electrodes is greater than the width of the positive electrode tab; The plurality of sub-electrodes include a first sub-electrode and a second sub-electrode, the first sub-electrode protruding from a first edge of the negative electrode body, and the second sub-electrode protruding from a second edge of the negative electrode body; The positive electrode tab is electrically connected to the positive terminal, and both the first and second electrode tabs are electrically connected to the negative terminal. The width of the first sub-taper is the same as the length of the first edge.

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 body.

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

5. The battery cell according to claim 1, characterized in that, The width of the first sub-tab is greater than the width of the positive 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 1-6, characterized in that, The electrode assembly is a stacked electrode assembly.

8. A battery, characterized in that, Includes the battery cell as described in any one of claims 1-7.

9. An electrical appliance, characterized in that, Includes the battery as described in claim 8.

10. A method for manufacturing a battery cell, used to manufacture a battery cell as described in any one of claims 1-7, characterized in that, include: Provide a casing; An electrode assembly is provided, the electrode assembly including a positive electrode plate and a negative electrode plate, the positive electrode plate including a positive electrode plate body and a positive electrode tab, the positive electrode tab protruding from the positive electrode plate body, the negative electrode plate including a negative electrode plate body and a negative electrode tab, the negative electrode tab protruding from the negative electrode plate body, the width of the negative electrode tab being greater than the width of the positive electrode tab; The electrode assembly is placed inside the housing.

11. A battery cell manufacturing apparatus for manufacturing battery cells as described in any one of claims 1-7, characterized in that, include: A module is provided for providing a housing and an electrode assembly, the electrode assembly including a positive electrode plate and a negative electrode plate, the positive electrode plate including a positive electrode plate body and a positive electrode tab, the positive electrode tab protruding from the positive electrode plate body, the negative electrode plate including a negative electrode plate body and a negative electrode tab, the negative electrode tab protruding from the negative electrode plate body, the width of the negative electrode tab being greater than the width of the positive electrode tab; An assembly module for placing the electrode assembly into the housing.

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