Battery cell, battery device and electric equipment

Abstract

The utility model discloses a battery cell, a battery device and electric equipment, and relates to the technical field of batteries, the battery cell comprises a separator and at least two pole pieces, the separator separates the at least two pole pieces, and each pole piece comprises a pole piece body and a tab; the pole piece body is provided with a coating area, and the coating area is coated with an active material; the tab is connected to the pole piece body, the tab is provided with a first reinforcing area and a second reinforcing area along the height direction of the tab, and the second reinforcing area is closer to the coating area of the pole piece body relative to the first reinforcing area; the first reinforcing area is provided with a first reinforcing structure; the second reinforcing area is provided with a second reinforcing structure, and the second reinforcing structure is an additional material piece additionally arranged in the second reinforcing area. The second reinforcing structure comprises a plurality of reinforcing pieces distributed at intervals. The problem of insufficient strength of the root part of the lug can be improved while stress concentration of the root part of the lug can be avoided.

Description

TECHNICAL FIELD

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

[0002] Before the ear is formed, the pole piece usually undergoes cold pressing process for calendering. The pole piece body is a coating area. The coating area is jointly acted on by pressure and tension, and the coating area will be extended and lengthened. The position corresponding to the ear is a blank area (without coating treatment, and the thickness is the original state of the current collector). In order to match the extension of the coating area, the blank area will be stretched. A length difference will be formed between the blank area and the coating area, and a wavy edge of the blank area will be formed. After the ear is formed, the ear will form a collapsed edge.

[0003] In the related art, a reinforcing rib is usually rolled or stamped on the ear to improve the strength of the ear and solve the problem of ear collapse. However, if the distance between the reinforcing rib and the coating area is too close, the reinforcing rib will interfere with the coating area and cause stress concentration at the root of the ear. If the distance between the reinforcing rib and the coating area is too far, the strength of the ear root will be insufficient and the ear root will be easily folded. CONTENT OF THE UTILITY MODEL

[0004] In view of the above problems, the present application provides a battery cell, a battery device and an electric device, which aims to avoid stress concentration at the root of the ear and improve the problem of insufficient strength of the ear root.

[0005] The present application provides a battery cell, which comprises a separator and at least two pole pieces. The separator separates the at least two pole pieces. The pole piece comprises a pole piece body and an ear. The pole piece body is provided with a coating area, and the coating area is coated with an active material. The ear is connected to the pole piece body. The ear has a first reinforcing area and a second reinforcing area along the height direction of the ear. The second reinforcing area is closer to the coating area of the pole piece body than the first reinforcing area. The first reinforcing area is provided with a first reinforcing structure. The second reinforcing area is provided with a second reinforcing structure. The second reinforcing structure is an additional additive member added to the second reinforcing area. The second reinforcing structure comprises a plurality of reinforcing members distributed at intervals.

[0006] In the technical solutions of the embodiments of the present application, the first reinforcing structure is arranged in the first reinforcing area of the tab, and the strength of the tab can be improved by the design of the first reinforcing structure to improve the problem of tab edge collapse. Meanwhile, the second reinforcing structure is arranged in the second reinforcing area of the tab, and the second reinforcing structure is arranged in the second reinforcing area of the tab by additionally adding a material, and the strength of the root of the tab can be improved by the design of the second reinforcing structure. In addition, the second reinforcing structure is formed by additionally adding a reinforcing material in the second reinforcing area, rather than being formed by rolling or stamping deformation, so the design of the second reinforcing structure does not damage the coating area of the tab body. Therefore, by arranging the second reinforcing structure on the second reinforcing area between the first reinforcing area and the tab body, the problem of insufficient strength of the root of the tab can be effectively improved while avoiding stress concentration at the root of the tab.

[0007] In addition, by adopting the design of multiple reinforcing members distributed at intervals, the problem of insufficient strength of the root of the tab can be effectively improved while avoiding stress concentration at the root of the tab, and the root of the tab also has a certain flexibility, so that the tab can be easily bent during subsequent battery assembly.

[0008] In some embodiments, the multiple reinforcing members are distributed at intervals along the width direction of the tab, or the multiple reinforcing members are distributed at intervals along the height direction of the tab, or multiple reinforcing members distributed at intervals are arranged along the width direction and the height direction of the tab. By arranging multiple reinforcing members distributed at intervals along at least one of the width direction and the height direction of the tab, the strength of the root of the tab can be further improved to reduce the phenomenon of folding at the root of the tab.

[0009] In some embodiments, when the multiple reinforcing members are distributed at intervals along the width direction of the tab, the reinforcing members are arranged to extend along the height direction of the tab, or the reinforcing members are arranged to be inclined relative to the height direction of the tab. Such a design can set the shape of the reinforcing member according to the strength requirement of the tab to meet different strength requirements of the tab.

[0010] In some embodiments, the multiple reinforcing members are equidistantly distributed along the width direction of the tab. Such a design can make the interval distance between any two adjacent reinforcing members equal, so that the multiple reinforcing members can form balanced reinforcing force at the root of the tab to further improve the strength of the root of the tab.

[0011] In some embodiments, the plurality of reinforcing members have equal heights; or, part of the reinforcing members extend into the first reinforcing region. With such a design, the plurality of reinforcing members with equal heights can form a more balanced reinforcing force at the root of the tab, which can further improve the strength of the tab root; and by extending part of the reinforcing members into the first reinforcing region, the reinforcing members can not only reinforce the strength of the tab root, but also appropriately reinforce the strength of the tab corresponding to the first reinforcing region, while avoiding affecting the flexibility of the tab when all the reinforcing members extend into the first reinforcing region, so that the tab is convenient to bend during the subsequent battery assembly process.

[0012] In some embodiments, at least one of the width and thickness of the reinforcing member gradually increases in the direction from the vicinity of the first reinforcing region to the region away from the first reinforcing region. With such a design, the width and / or thickness value corresponding to the position of the reinforcing member closer to the tab body is larger, and the width and / or thickness value corresponding to the position of the reinforcing member closer to the first reinforcing region is smaller, so that the strength of the tab root closer to the tab body is larger, and the strength of the tab root closer to the first reinforcing region is smaller, which can effectively improve the strength of the tab root while reducing the influence of the reinforcing member on the flexibility of the first reinforcing region, so that the tab has a certain flexibility, and the tab is convenient to bend during the subsequent battery assembly process.

[0013] In some embodiments, the first reinforcing structure is formed by protruding from one side of the thickness direction of the tab; the end of the first reinforcing structure close to the tab body extends into the second reinforcing region, and there is a gap between the end of the first reinforcing structure close to the tab body and the tab body. With such a design, compared with forming a reinforcing structure in the first reinforcing region of the tab by increasing the amount of material, the present embodiment forms the first reinforcing structure by adopting a rolling or stamping deformation method, which can improve the strength of the tab to improve the tab edge collapse problem while making the tab have a certain flexibility, so that the tab is convenient to bend during the subsequent battery assembly process. In addition, the end of the first reinforcing structure extending into the second reinforcing region can reinforce the second reinforcing region of the tab to further improve the strength of the tab root, while the gap between the end of the first reinforcing structure close to the tab body and the tab body can avoid damaging the tab body during the process of pressing out the first reinforcing structure, thereby avoiding the problem of stress concentration at the root of the tab.

[0014] The application also provides a battery device comprising a battery box and the above-mentioned battery cell, wherein the battery cell is arranged in the battery box.

[0015] The application also provides a power consumption device comprising the above-mentioned battery device.

[0016] The above description is only a summary of the technical solutions of the present application. In order to make the technical means of the present application more clearly understood and implemented according to the content of the description, and in order to make other purposes, features and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application will be described. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained according to the structures shown in these drawings without creative labor.

[0018] Figure 1 Structure schematic diagram of an embodiment of the electric device of the present application;

[0019] Figure 2 Exploded view of an embodiment of the battery device of the present application;

[0020] Figure 3 Structure schematic diagram of a first embodiment of the pole piece of the present application;

[0021] Figure 4 Structure schematic diagram of a second embodiment of the pole piece of the present application;

[0022] Figure 5 Structure schematic diagram of a third embodiment of the pole piece of the present application;

[0023] Figure 6 Structure schematic diagram of a fourth embodiment of the pole piece of the present application;

[0024] Figure 7 Structure schematic diagram of a fifth embodiment of the pole piece of the present application;

[0025] Figure 8 Structure schematic diagram of a sixth embodiment of the pole piece of the present application;

[0026] Figure 9 Structure schematic diagram of a seventh embodiment of the pole piece of the present application;

[0027] Figure 10 Structure schematic diagram of an eighth embodiment of the pole piece of the present application.

[0028] Explanation of reference numerals:

[0029]

[0030] The implementation of the purpose of the present application, the functional features and the advantages will be further described with reference to the drawings. DETAILED DESCRIPTION

[0031] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application; the terms "include" and "have" and any variations thereof used in the specification and claims of the present application and the above description of drawings are intended to cover the non-exclusive inclusion.

[0033] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0034] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to each other. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0035] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0036] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or component must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0037] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "linking", "fixing" and the like should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or can be integrated; can be mechanical connection, can also be electrical connection; can be direct connection, can also be indirect connection through an intermediate medium, can be internal communication of two components or interaction relationship between two components. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0038] The battery device mentioned in the art is also called battery, which can be divided into primary battery and rechargeable battery according to whether it can be charged. The common types of rechargeable batteries at present are: lead-acid battery, nickel-hydrogen battery and lithium-ion battery. Lithium-ion batteries are widely used in pure electric vehicles and hybrid electric vehicles at present. The capacity of lithium-ion batteries used for such purposes is relatively low, but has larger output, charging current and longer service life, but the cost is higher.

[0039] The battery described in the embodiments of the present application refers to a rechargeable battery. Hereinafter, the embodiments disclosed in the present application will be mainly described taking lithium-ion batteries as examples. It should be understood that the embodiments disclosed in the present application are applicable to any other appropriate type of rechargeable battery. The battery mentioned in the embodiments disclosed in the present application can be directly or indirectly applied to an appropriate device to power the device.

[0040] The battery mentioned in the embodiments disclosed in the present application refers to a single physical module including one or more battery cells to provide a predetermined voltage and capacity. The battery cell is the basic unit in the battery, which can be generally divided into cylindrical battery cell, cuboid battery cell and soft-pack battery cell according to the packaging mode. Hereinafter, the embodiments will be mainly described around the cuboid battery cell. It should be understood that the embodiments described hereinafter are also applicable to cylindrical battery cell or soft-pack battery cell in some aspects.

[0041] The battery cell includes positive electrode sheet, negative electrode sheet, electrolyte and separator. The lithium-ion battery mainly relies on the movement of lithium ions between the positive electrode sheet and the negative electrode sheet to work. The thin film structure of the three layers of materials in the cylindrical battery cell is wound into a cylindrical electrode assembly, while the thin film structure is wound or stacked into an electrode assembly with a substantially cuboid shape in the cuboid battery cell.

[0042] In a conventional battery cell structure, the battery cell includes a case, an electrode assembly, and an electrolyte. The electrode assembly is accommodated in the case of the battery cell, and includes a positive electrode tab, a negative electrode tab, and a separator. The battery case includes a bottom case and a cover. The bottom case includes an accommodation cavity formed by a plurality of walls and an opening. The cover is disposed at the opening to close the accommodation cavity. The electrolyte is accommodated in the accommodation cavity in addition to the electrode assembly. The positive electrode tab and the negative electrode tab in the electrode assembly include a tab. To avoid fusing by a large current, the number of positive electrode tabs is plural and stacked together, and the number of negative electrode tabs is plural and stacked together. The tabs are electrically connected to electrode terminals located outside the battery cell through a connection member. The electrode terminals generally include a positive electrode terminal and a negative electrode terminal. For a cuboid battery cell, the electrode terminals are generally provided at the cover portion. A plurality of battery cells are connected in series and / or in parallel together via the electrode terminals to be applied to various application occasions.

[0043] In some high-power application occasions such as electric vehicles, the application of the battery includes three levels: battery cell, battery module, and battery. The battery module is formed by electrically connecting a certain number of battery cells together and putting them into a frame in order to protect the battery cells from external impact, heat, vibration, etc. The battery refers to the final state of the battery system loaded into the electric vehicle. The battery generally includes a battery case for packaging one or more battery cells.

[0044] In recent years, new energy vehicles have made a leap, and in the field of electric vehicles, power batteries, as the power source of electric vehicles, play an irreplaceable important role. The battery is composed of a battery case and a plurality of battery cells accommodated in the battery case. Among them, the battery as a core part of new energy vehicles has higher requirements in safety. At present, the mechanical safety of the power battery during use is one of the battery safety problems that consumers are generally concerned about.

[0045] The battery provided by the embodiments of the present application can be a power source for an electric device. The electric device can be a mobile phone, a portable device, a notebook computer, an electric vehicle, an electric vehicle, a ship, a spacecraft, an electric toy, and an electric tool, etc. For example, the spacecraft includes an airplane, a rocket, a space shuttle, and a spacecraft, etc. The electric toy includes a fixed or mobile electric toy, such as a game console, an electric vehicle toy, an electric ship toy, and an electric plane toy, etc. The electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and a railway electric tool, such as a power drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, and an electric planer.

[0046] The following embodiments take a vehicle 1000 as an example for convenience of description.

[0047] For example, Figure 1A structural schematic diagram of an embodiment of the power consuming device 1000 in the present application. The power consuming device 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or a range extended vehicle, etc. The power consuming device 1000 can be provided with a battery device 100, a controller 200 and a motor 300. The controller 200 is used to control the power supply of the battery device 100 to the motor 300. For example, the battery device 100 can be arranged at the bottom, the front or the rear of the power consuming device 1000. The battery device 100 can be used for power supply of the power consuming device 1000. For example, the battery device 100 can be used as an operating power source of the power consuming device 1000, which is used for the circuit system of the power consuming device 1000, for example, for the power demand of the power consuming device 1000 during starting, navigation and running. In another embodiment of the present application, the battery device 100 can not only be used as an operating power source of the power consuming device 1000, but also be used as a driving power source of the power consuming device 1000, which replaces or partially replaces the fuel or natural gas to provide driving power for the power consuming device 1000.

[0048] For example, refer to Figure 2 , Figure 2 An exploded view of an embodiment of the battery device 100 in the present application. The battery device 100 includes a battery box 10 and a battery cell 20. The battery box 10 has a containing space for containing the battery cell 20. The battery box 10 can have various structures. In some embodiments, the battery box 10 can include a first part 10a and a second part 10b. The first part 10a and the second part 10b are overlapped with each other, and the first part 10a and the second part 10b together define the containing space for containing the battery cell 20. The second part 10b can be a hollow structure with one end open. The first part 10a can be a plate structure, which is overlapped with the open end of the second part 10b to define the containing space together with the second part 10b. The first part 10a and the second part 10b can also be hollow structures with one side open, and the open end of the first part 10a is overlapped with the open end of the second part 10b. Of course, the battery box 10 formed by the first part 10a and the second part 10b can have various shapes, such as a cylinder, a cuboid, etc.

[0049] In the battery device 100, the battery cell 20 can be one or multiple. When the battery device 100 has multiple battery cells 20, the multiple battery cells 20 can be connected in series, in parallel, or in a mixed connection, where the mixed connection means that the multiple battery cells 20 are connected in series and in parallel. The multiple battery cells 20 can be directly connected in series, in parallel, or in a mixed connection, and then the multiple battery cells 20 are accommodated in the battery box 10. Of course, the battery device 100 can also be that the multiple battery cells 20 are connected in series, in parallel, or in a mixed connection to form a battery module, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and then the whole is accommodated in the battery box 10.

[0050] Before the tab is formed, the tab usually undergoes a cold pressing process for rolling. The tab body is a coating area, and the coating area is jointly acted on by pressure and tension, so that the coating area is stretched and lengthened. The position corresponding to the tab is a blank area (without coating treatment, and the thickness is the original state of the current collector). In order to match the stretching of the coating area, the blank area is stretched, and a length difference is formed between the blank area and the coating area. The length difference of the blank area forms a wavy edge of the blank area. After the tab is formed, the tab forms a collapsed edge.

[0051] In the related art, a reinforcing rib is usually rolled or stamped on the tab to improve the strength of the tab and solve the problem of tab collapse. However, if the distance between the reinforcing rib and the coating area is too close, the reinforcing rib will interfere with the coating area and cause stress concentration at the root of the tab. If the distance between the reinforcing rib and the coating area is too far, the strength of the tab root is not enough and the tab root is easily folded.

[0052] Based on the above problems, the present application provides a battery cell 20, which aims to avoid stress concentration at the root of the tab 212 and improve the problem of insufficient strength of the tab 212. The following will be described in detail in combination with specific drawings and embodiments.

[0053] Please refer to Figures 3 to 10 In an embodiment of the present application, the battery cell 20 includes a separator and at least two tabs 21. The separator separates the at least two tabs 21. The tab 21 includes a tab body 211 and a tab 212. The tab body 211 is provided with a coating area, and the coating area is coated with an active material. The tab 212 is connected to the tab body 211. The tab 212 has a first reinforcing area a and a second reinforcing area b along the height direction of the tab 212. The second reinforcing area b is closer to the coating area of the tab body 211 than the first reinforcing area a. The first reinforcing area a is provided with a first reinforcing structure 2121. The second reinforcing area b is provided with a second reinforcing structure 2122. The second reinforcing structure 2122 is an additional additive member added to the second reinforcing area b. The second reinforcing structure 2122 includes a plurality of reinforcing members 212b distributed at intervals.

[0054] In this embodiment, the tab body 211 refers to the position of the tab 21 other than the tab ear 212, and the position corresponding to the tab body 211 is the coating film area, and the position corresponding to the tab ear 212 is the blank area. Among them, the at least two tabs 21 can include positive and negative tabs. The active material coated on the coating area of the positive tab can include but is not limited to lithium cobalt oxide (LiCoO2), lithium manganese oxide (LiMn2O4), lithium iron phosphate (LiFePO4), etc. These materials can undergo reversible oxidation-reduction reaction with lithium ions, thereby realizing the charging and discharging process of the battery; the active material coated on the coating area of the negative tab can include but is not limited to graphite, silicon-based materials, lithium titanate (Li4Ti5O12), etc. These materials can store and release lithium ions, thereby realizing the energy storage and release function of the battery.

[0055] It should be noted that the root of the tab ear 212 refers to the position where the tab ear 212 is connected to the tab body 211.

[0056] The first reinforcing structure 2121 of the first reinforcing area a can be formed by roll pressing or stamping deformation, or can be formed by additive method. Of course, if the first reinforcing structure 2121 of the first reinforcing area a is formed by additive method, it will cause the tab ear 212 to be inconvenient to bend during subsequent battery assembly process.

[0057] The material, size, shape and additive forming method of the second reinforcing structure 2122 of the second reinforcing area b can be optimized and designed according to the specific size and strength requirement of the tab ear 212, which is not limited here, as long as the strength of the tab ear 212 is improved by the design of the second reinforcing structure 2122. Optionally, the material of the second reinforcing structure 2122 can include but is not limited to ceramic, plastic, fiber, etc. Insulating parts, but also can include but is not limited to aluminum, titanium, copper, copper alloy, nickel alloy, etc. Metal parts, but also can include but is not limited to metal matrix composites or ceramic matrix composites. The shape of the second reinforcing structure 2122 can include but is not limited to strip, point, block, wave, net and other shapes. The additive forming method can include but is not limited to spraying, rolling, electroplating, laser engraving, mold forming and other methods.

[0058] The additive method is used to directly form a plurality of spaced reinforcing parts 212b on the second reinforcing area b of the tab ear 212. Optionally, the materials, sizes and shapes of the plurality of reinforcing parts 212b can be the same or different. And the arrangement of the plurality of reinforcing parts 212b can be distributed along the width direction of the tab ear 212, or can be distributed along the height direction of the tab ear 212, or can be distributed along the diagonal direction of the tab ear 212, or can be distributed randomly in the second reinforcing area b.

[0059] In summary, in the technical scheme of the embodiment of the application, the first reinforcing structure 2121 is arranged at the first reinforcing area a of the tab 212, which can improve the strength of the tab 212 by the design of the first reinforcing structure 2121, thereby improving the problem of tab 212 collapse. Meanwhile, the second reinforcing structure 2122 is arranged at the second reinforcing area b of the tab 212, which is arranged at the second reinforcing area b of the tab 212 by additionally adding the material, and the strength of the root of the tab 212 can be improved by the design of the second reinforcing structure 2122. In addition, the second reinforcing structure 2122 is formed by directly adding the reinforcing material at the second reinforcing area b, rather than by rolling or stamping deformation, so that the design of the additive reinforcing structure 2122 does not damage the coating area of the tab body 211. Therefore, by arranging the second reinforcing structure 2122 at the second reinforcing area b between the first reinforcing area a and the tab body 211, the problem of insufficient strength of the root of the tab 212 can be effectively improved while avoiding stress concentration at the root of the tab 212.

[0060] In addition, by adopting the design of the plurality of reinforcing members 212b arranged at intervals, the problem of insufficient strength of the root of the tab 212 can be effectively improved while avoiding stress concentration at the root of the tab 212, and the root of the tab 212 can have a certain flexibility, so that the tab 212 can be easily bent during the subsequent battery assembly process.

[0061] It should be noted that the material, spacing, width, height, thickness and other parameters of the reinforcing member 212b can be optimized and designed according to the specific size and strength requirements of the tab 212.

[0062] Optionally, the material of the reinforcing member 212b can be an insulating coating, for example, a ceramic matrix composite material.

[0063] Optionally, the spacing between the two adjacent reinforcing members 212b can be between 0.1 mm and 8 mm, for example, 0.1 mm, 0.5 mm, 0.8 mm, 1 mm, 1.3 mm, 1.7 mm, 2 mm, 2.2 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 6 mm, 7 mm, 8 mm, etc. Of course, if the size of the tab 212 is large or small, the spacing between the two adjacent reinforcing members 212b can also be appropriately increased or decreased.

[0064] Optionally, the width of the reinforcing member 212b can be between 0.1mm and 6mm, for example, 0.1mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 6mm, etc. Of course, if the tab 212 is large or small in size, the width of the reinforcing member 212b can be appropriately increased or decreased.

[0065] Optionally, the height of the reinforcing member 212b can be between 1mm and 10mm, for example, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 10mm, etc. Of course, if the tab 212 is large or small in size, the height of the reinforcing member 212b can be appropriately increased or decreased.

[0066] Optionally, the thickness of the reinforcing member 212b can be between 1um and 100um, for example, 1um, 5um, 10um, 15um, 20um, 25um, 30um, 35um, 40um, 45um, 50um, 55um, 60um, 65um, 70um, 75um, 80um, 85um, 90um, 95um, 100um, etc. Of course, if the tab 212 is large or small in size, the thickness of the reinforcing member 212b can be appropriately increased or decreased.

[0067] Referring to Figures 3 to 10 In an embodiment of the present application, the plurality of reinforcing members 212b are spaced apart along the width direction of the tab 212, or the plurality of reinforcing members 212b are spaced apart along the height direction of the tab 212, or the plurality of reinforcing members 212b are spaced apart along both the width direction and the height direction of the tab 212.

[0068] Such a design, by providing the plurality of reinforcing members 212b spaced apart along at least one of the width direction and the height direction of the tab 212, can further improve the strength of the root of the tab 212 to reduce the phenomenon of folding at the root of the tab 212.

[0069] Referring to Figures 3 to 5 In an embodiment of the present application, when the plurality of reinforcing members 212b are spaced apart along the width direction of the tab 212, the reinforcing member 212b is arranged extending along the height direction of the tab 212, or referring to Figures 6 to 8 The reinforcing member 212b is arranged inclined relative to the height direction of the tab 212.

[0070] When the plurality of reinforcing members 212b are arranged along the height direction of the tab 212, the plurality of reinforcing members 212b can form a straight comb-shaped protruding structure; when the plurality of reinforcing members 212b are arranged obliquely relative to the height direction of the tab 212, the plurality of reinforcing members 212b can form an oblique comb-shaped protruding structure, or form a cross comb-shaped protruding structure.

[0071] Such a design can correspondingly set the shape of the reinforcing member 212b according to the strength requirement of the tab 212 to meet the different strength requirements of the tab 212.

[0072] Please refer to Figures 3 to 9 In an embodiment of the present application, the plurality of reinforcing members 212b are equidistantly distributed along the width direction of the tab 212.

[0073] Such a design can make the interval distance between any two adjacent reinforcing members 212b equal, so that the plurality of reinforcing members 212b can form balanced reinforcing force at the root of the tab 212, which can further improve the strength of the root of the tab 212.

[0074] Of course, in other embodiments, the plurality of reinforcing members 212b can also be distributed at variable intervals along the width direction of the tab 212, for example, the interval between two adjacent reinforcing members 212b gradually increases or gradually decreases in the same direction, or first increases and then decreases.

[0075] Please refer to Figure 3 , Figures 5 to 9 In an embodiment of the present application, the heights of the plurality of reinforcing members 212b are equal; or, please refer to Figure 4 , some of the reinforcing members 212b extend into the first reinforcing area a.

[0076] When the heights of the plurality of reinforcing members 212b are equal, the plurality of reinforcing members 212b can form an equal-height comb-shaped protruding structure; when some of the reinforcing members 212b extend into the first reinforcing area a, the plurality of reinforcing members 212b can form a comb-shaped protruding structure with uneven height.

[0077] Such a design can form more balanced reinforcing force at the root of the tab 212 by the plurality of reinforcing members 212b with equal height, which can further improve the strength of the root of the tab 212; and by making some of the reinforcing members 212b extend into the first reinforcing area a, the reinforcing member 212b can not only strengthen the strength of the root of the tab 212, but also appropriately strengthen the strength of the tab 212 corresponding to the first reinforcing area a, while avoiding affecting the flexibility of the tab 212 when all the reinforcing members 212b extend into the first reinforcing area a, so that the tab 212 is convenient to bend during the subsequent battery assembly process.

[0078] Please refer to Figure 5In an embodiment of the present application, at least one of the width and the thickness of the reinforcing member 212b gradually increases from the position close to the first reinforcing area a to the position away from the first reinforcing area a.

[0079] Such design can make the width and / or thickness value of the reinforcing member 212b corresponding to the position close to the pole piece body 211 larger, and make the width and / or thickness value of the reinforcing member 212b corresponding to the position close to the first reinforcing area a smaller, so as to make the strength of the tab 212 root close to the pole piece body 211 larger, and make the strength of the tab 212 root close to the first reinforcing area a smaller, which can effectively improve the strength of the tab 212 root, and at the same time, reduce the influence of the reinforcing member 212b on the flexibility of the first reinforcing area a, so that the tab 212 has a certain flexibility, and the tab 212 is convenient to bend in the subsequent battery assembly process.

[0080] In actual application, the width of the reinforcing member 212b can gradually increase from the position close to the first reinforcing area a to the position away from the first reinforcing area a; or the thickness of the reinforcing member 212b can gradually increase; or both the width and the thickness of the reinforcing member 212b can gradually increase.

[0081] In actual application, the second reinforcing structure 2122 of the present application can include but is not limited to the following several embodiments:

[0082] In the first embodiment, please refer to Figure 3 , the plurality of reinforcing members 212b are equidistantly distributed along the width direction of the tab 212 and are arranged to extend along the height direction of the tab 212, and the heights of the plurality of reinforcing members 212b are equal.

[0083] In the second embodiment, please refer to Figure 4 , the plurality of reinforcing members 212b are equidistantly distributed along the width direction of the tab 212 and are arranged to extend along the height direction of the tab 212, and part of the reinforcing members 212b extend into the first reinforcing area a.

[0084] In the third embodiment, please refer to Figure 5 , the plurality of reinforcing members 212b are equidistantly distributed along the width direction of the tab 212 and are arranged to extend along the height direction of the tab 212, and the thickness of the reinforcing member 212b gradually increases from the position close to the first reinforcing area a to the position away from the first reinforcing area a.

[0085] In the fourth embodiment, please refer to Figure 6 , the plurality of reinforcing members 212b are equidistantly distributed along the width direction of the tab 212 and are arranged to tilt to one side relative to the height direction of the tab 212, and the heights of the plurality of reinforcing members 212b are equal.

[0086] In the fifth embodiment, please refer toFigure 7 The plurality of reinforcing members 212b are equidistantly distributed along the width direction of the tab 212, are obliquely arranged relative to the height direction of the tab 212, and have equal heights.

[0087] In the sixth embodiment, referring to Figure 8 The plurality of reinforcing members 212b are equidistantly distributed along the width direction of the tab 212, are cross-shaped, and have equal heights.

[0088] In the seventh embodiment, referring to Figure 9 The plurality of reinforcing members 212b are equidistantly distributed along the width direction of the tab 212, are wavy-shaped, and have equal heights.

[0089] In the eighth embodiment, referring to Figure 10 The plurality of reinforcing members 212b are equidistantly distributed along the width direction of the tab 212, are dot-shaped, and have equal heights.

[0090] Referring to Figures 3 to 10 In an embodiment of the present application, the reinforcing structure 2121 is formed by protruding from one side of the thickness direction of the tab 212; the end of the reinforcing structure 2121 close to the pole piece body 211 extends into the second reinforcing area b, and there is a gap between the end of the reinforcing structure 2121 close to the pole piece body 211 and the pole piece body 211.

[0091] In the embodiment, the reinforcing structure 2121 can be formed by protruding from one side of the thickness direction of the tab 212 through rolling or stamping deformation, and the other side is concave.

[0092] When the end of the reinforcing structure 2121 close to the pole piece body 211 extends into the second reinforcing area b, the end of the reinforcing structure 2121 can partially overlap with the second reinforcing structure 2122 in the second reinforcing area b, can be equidistantly distributed with the second reinforcing structure 2122 in the second reinforcing area b, or can be abutted with the second reinforcing structure 2122 in the second reinforcing area b.

[0093] Compared with forming the reinforcing structure 2121 by increasing the amount of material at the first reinforcing area a of the tab 212, the embodiment forms the reinforcing structure 2121 by adopting the way of roller pressing or stamping deformation, which can improve the strength of the tab 212 to improve the tab 212 collapse problem, and also enable the tab 212 to have a certain flexibility, so that the tab 212 is easy to bend during the subsequent battery assembly process. In addition, the reinforcing structure 2121 can extend into one end of the second reinforcing area b to reinforce the second reinforcing area b of the tab 212, so as to further improve the strength of the root of the tab 212, and since the end of the reinforcing structure 2121 close to the pole piece body 211 has a gap with the pole piece body 211, the pole piece body 211 can be prevented from being damaged during the process of pressing the reinforcing structure 2121, thereby avoiding the problem of stress concentration at the root of the tab 212.

[0094] In an embodiment of the present application, the reinforcing structure 2121 includes a plurality of reinforcing ribs 212a, and the plurality of reinforcing ribs 212a are distributed along the width direction of the tab 212 and extend along the height direction of the tab 212.

[0095] Such a design can enable the plurality of reinforcing ribs 212a to more comprehensively cover the first reinforcing area a of the tab 212, so as to form a more balanced reinforcing force on the first reinforcing area a of the tab 212, and further improve the strength of the tab 212.

[0096] Please refer to Figure 2 The present application also provides a battery device 100, which includes a battery box 10 and a battery cell 20. The specific structure of the battery cell 20 is referred to the above embodiments. Since the battery device 100 adopts all the technical solutions of the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here. The battery cell 20 is arranged in the battery box 10.

[0097] The present application also provides a battery device 100, which includes a battery box 10 and a battery cell 20. The specific structure of the battery cell 20 is referred to the above embodiments. Since the battery device 100 adopts all the technical solutions of the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here. The battery cell 20 is arranged in the battery box 10.

[0098] The above is only an exemplary embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structural transformation made by referring to the content of the present application specification and drawings, or direct / indirect application in other related technical fields is included in the patent protection scope of the present application.

Claims

1. An electric core comprising separators and at least two pole pieces, the separators separating at least two of the pole pieces, characterized in that, The pole piece comprises: a pole piece body provided with a coating area where active material is coated; a pole lug connected to the pole piece body, the pole lug having a first reinforcing area and a second reinforcing area in the height direction of the pole lug, the second reinforcing area being closer to the coating area of the pole piece body than the first reinforcing area; the first reinforcing area is provided with a first reinforcing structure; the second reinforcing area is provided with a second reinforcing structure, the second reinforcing structure being an additive member additionally provided in the second reinforcing area; the second reinforcing structure comprises a plurality of reinforcing members distributed at intervals.

2. The cell of claim 1, wherein, The plurality of reinforcing members are distributed at intervals in the width direction of the pole lug. Alternatively, the plurality of reinforcing members are distributed at intervals in the height direction of the pole lug. Alternatively, the plurality of reinforcing members are distributed at intervals in both the width direction and the height direction of the pole lug.

3. The cell of claim 2, wherein, When the plurality of reinforcing members are distributed at intervals in the width direction of the pole lug, the reinforcing members are arranged extending in the height direction of the pole lug, or the reinforcing members are arranged inclined relative to the height direction of the pole lug.

4. The cell of claim 3, wherein, The plurality of reinforcing members are equidistantly distributed in the width direction of the pole lug.

5. The cell of claim 3, wherein, The plurality of reinforcing members have equal heights. Alternatively, part of the reinforcing members extend into the first reinforcing area.

6. The cell of claim 3, wherein, In the direction from the first reinforcing area to the second reinforcing area, at least one of the width and the thickness of the reinforcing members gradually increases.

7. The cell of any one of claims 1 to 6, wherein, The first reinforcing structure is formed by protruding from one side of the thickness direction of the pole lug itself; One end of the first reinforcing structure close to the pole piece body extends into the second reinforcing area, and there is a gap between the one end of the first reinforcing structure close to the pole piece body and the pole piece body.

8. A battery device characterized by comprising: It comprises: a battery box; the battery cell as claimed in any one of claims 1 to 7 is arranged in the battery box.

9. An electric device, characterized by It comprises the battery device as claimed in claim 8.

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