Pole piece structure, pole core, battery and electric equipment

Abstract

The utility model provides a pole piece structure, a pole core, a battery and electric equipment, and relates to the technical field of batteries. The pole piece structure comprises a base material body, a tab and an insulating coating, the tab is arranged on one side of the base material body and comprises a blank part and a coating part, the blank part is connected with the base material body, and the coating part is arranged on the side, away from the base material body, of the blank part; the insulating coating is arranged on the surface of the coating part. According to the pole piece structure, the pole core, the battery and the electric equipment, the problem that the end part of the pole lug is easily contacted with a surrounding cover plate or a shell and the like can be solved, the insulativity of the pole core is ensured, and the safety of the pole core is improved.

Description

TECHNICAL FIELD

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

[0002] The pole core is usually composed of a positive pole piece, a diaphragm and a negative pole piece, wherein the diaphragm is located between the positive pole piece and the negative pole piece to prevent the positive pole piece and the negative pole piece from directly contacting each other.

[0003] The edge of the pole piece is provided with a pole lug, and after the lamination or winding process, a plurality of layers of overlapping positive pole lugs and negative pole lugs are formed. In the assembly process of the pole core, the positive pole lugs and the negative pole lugs need to be connected with the cover plate pole by welding or conductive adhesive bonding. Usually, the welding or bonding area only covers part of the surface of the pole lug to realize electrical connection.

[0004] However, the end of the pole lug is in a free state, and under the working condition of vibration of the pole core, it is easy to contact the surrounding cover plate or shell, etc., which reduces the insulation of the pole core and increases the safety risk. UTILITY MODEL CONTENT

[0005] The pole piece structure, the pole core, the battery and the electric device provided by the embodiments of the present application solve the problem that the end of the pole lug is easy to contact the surrounding cover plate or shell, etc., ensure the insulation of the pole core and improve the safety of the pole core.

[0006] In a first aspect, the present application provides a pole piece structure, comprising a base material body, a pole lug and an insulating coating;

[0007] The pole lug is arranged on one side of the base material body, and the pole lug comprises a blank part and a coated part, wherein the blank part is connected with the base material body, and the coated part is arranged on the side of the blank part away from the base material body.

[0008] The insulating coating is arranged on the surface of the coated part.

[0009] As an optional implementation, the number of the pole lug is one, and the length of the pole lug is less than or equal to the length of the base material body along the length direction of the base material body.

[0010] As an optional implementation, the number of the pole lug is multiple, and the multiple pole lugs are arranged at intervals along the length direction of the base material body.

[0011] As an optional implementation, the width of at least part of the number of the pole lugs is distributed in a gradient along the width direction of the base material body.

[0012] As an optional implementation, the widths of at least some of the coating portions are equal along the width direction of the substrate body, or the widths of at least some of the coating portions are distributed in a gradient manner.

[0013] As an optional implementation, the pole piece structure is a positive pole piece, the substrate body is a positive substrate body, and the insulating coating includes an active material coating.

[0014] Alternatively, the pole piece structure is a negative pole piece, and the substrate body is a negative substrate body.

[0015] As an optional implementation, the thickness of the coating portion is less than the thickness of the blank portion along the thickness direction of the substrate body.

[0016] As an optional implementation, the pole piece structure further includes an active material layer, and the active material layer is coated on the surface of the substrate body.

[0017] As an optional implementation, the thickness of the insulating coating is less than the thickness of the active material layer along the thickness direction of the substrate body.

[0018] As an optional implementation, the tab and the substrate body are in an integrated structure.

[0019] In a second aspect, the application provides a pole core, including a positive pole piece, a negative pole piece, and a separator, wherein the separator is arranged between the positive pole piece and the negative pole piece.

[0020] At least one of the positive pole piece and the negative pole piece includes any of the pole piece structures described above.

[0021] In a third aspect, the application provides a battery, including a cover plate and a pole core as described above, and the blank portion is electrically connected to the cover plate.

[0022] As an optional implementation, the battery further includes a connecting sheet, and the blank portion is electrically connected to the cover plate through the connecting sheet.

[0023] As an optional implementation, the tabs of the positive pole piece and the tabs of the negative pole piece are led out from the same side of the pole core, or the tabs of the positive pole piece and the tabs of the negative pole piece are led out from different sides of the pole core.

[0024] As an optional implementation, the battery further includes a shell, the cover plate is arranged on the shell, and the pole core is arranged in the shell.

[0025] The positive electrode sheet and the negative electrode sheet are respectively electrically connected with the cover plate, or the positive electrode sheet is electrically connected with the cover plate, and the negative electrode sheet is electrically connected with the shell.

[0026] In a fourth aspect, the present application provides a power consuming device comprising the above-mentioned any one of the electrode core or the above-mentioned any one of the battery.

[0027] The electrode sheet structure, the electrode core, the battery and the power consuming device provided by the present application, the electrode sheet structure comprises a substrate body, a tab and an insulating coating; the tab is arranged on one side of the substrate body, the tab comprises a blank part and a coated part, the blank part is connected with the substrate body, and the coated part is arranged on the side of the blank part away from the substrate body; and the insulating coating is arranged on the surface of the coated part. By arranging the coated part on the side of the blank part of the tab away from the substrate body and applying the insulating coating on the coated part, the insulating coating can form a reliable barrier to prevent the formation of unnecessary current paths. In this way, even under the influence of mechanical stress or vibration, the free end of the tab will not come into contact with the metal parts such as the cover plate or the shell, effectively isolating it from other conductive parts, reducing the possibility of electrical contact, improving the insulation of the electrode core, and ensuring the safety and stability of the electrode core under various working conditions. BRIEF DESCRIPTION OF DRAWINGS

[0028] The accompanying drawings, which are incorporated into and form a part of the specification, illustrate an embodiment consistent with the present application and, together with the description, serve to explain the principles of the application.

[0029] Figure 1 The electrode sheet structure provided by the embodiment of the present application is a structural schematic diagram of a positive electrode sheet;

[0030] Figure 2 The electrode sheet structure provided by the embodiment of the present application is a structural schematic diagram of a negative electrode sheet;

[0031] Figure 3 The electrode sheet structure provided by the embodiment of the present application is another structural schematic diagram of a positive electrode sheet;

[0032] Figure 4 The electrode sheet structure provided by the embodiment of the present application is another structural schematic diagram of a negative electrode sheet;

[0033] Figure 5 The electrode sheet structure provided by the embodiment of the present application is still another structural schematic diagram of a negative electrode sheet;

[0034] Figure 6 The structural schematic diagram of the electrode core in the battery provided by the embodiment of the present application is a structural schematic diagram of a stacked electrode core;

[0035] Figure 7 The structural schematic diagram of the electrode core in the battery provided by the embodiment of the present application is a structural schematic diagram of a wound electrode core;

[0036] Figure 8 A connection structure between the tab and the cover plate in a battery according to an embodiment of the present application is shown in the following figure;

[0037] Figure 9 Another connection structure between the tab and the cover plate in a battery according to an embodiment of the present application is shown in the following figure;

[0038] Figure 10 Still another connection structure between the tab and the cover plate in a battery according to an embodiment of the present application is shown in the following figure.

[0039] Explanation of reference signs:

[0040] 100, base material body;

[0041] 200, tab;

[0042] 210, blank part;

[0043] 220, coated part;

[0044] 300, insulating coating layer;

[0045] 400, active material layer;

[0046] 500, electrode core; 501, positive electrode sheet; 502, negative electrode sheet;

[0047] 510, positive tab;

[0048] 520, negative tab;

[0049] 600, cover plate;

[0050] 610, pole;

[0051] 620, connecting piece;

[0052] 700, conductive coating layer.

[0053] The specific embodiments of the present application have been shown in the above figures, and will be described in more detail hereinafter. These figures and the written description are not intended to limit the scope of the present application concept in any way, but to illustrate the present application concept to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0054] In order to make the objectives, 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 figures 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. Based on the embodiments in the embodiments of 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 embodiments of the present application.

[0055] In the embodiments of the present application, the terms "upper", "lower", "inner", "middle", "outer", "front", "back" and the like indicate the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the embodiments of the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation. In addition, in addition to indicating the orientation or positional relationship, the above-mentioned terms can also be used to indicate other meanings, for example, the term "upper" can also be used to indicate a certain dependent relationship or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in the embodiments of the present application can be understood according to the specific circumstances.

[0056] In addition, the terms "set", "connected", "fixed" should be broadly understood. For example, "connected" can be fixedly connected, detachably connected, or integrally configured; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium, or internal communication between two devices, elements or 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.

[0057] The terms "first", "second", "third", "fourth" and the like (if any) in the specification and claims of the embodiments of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily have to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0058] In the embodiments of the present application, the words "exemplarily" or "for example" and the like are used to represent examples, illustrations or descriptions. Any embodiment or design scheme described as "exemplarily" or "for example" in the embodiments of the present application should not be interpreted as more preferred or more advantageous than other embodiments or design schemes. Rather, the use of words such as "exemplarily" or "for example" is intended to present the relevant concept in a specific manner.

[0059] As described in the background, the pole core is usually composed of a positive pole sheet, a separator and a negative pole sheet, wherein the separator is located between the positive pole sheet and the negative pole sheet to prevent the positive pole sheet and the negative pole sheet from directly contacting.

[0060] The edge of the pole piece is provided with a tab, and after the lamination or winding process, a plurality of layers of overlapping positive and negative tabs are formed. During the assembly of the pole core, the positive and negative tabs need to be connected to the cover plate pole by welding or conductive adhesive bonding to form an electrical circuit. Usually, the welding or bonding area only covers part of the surface of the tab, which results in the tab not being completely fixed in the overall structure of the pole core, and the end of the tab is usually in a free state.

[0061] This free state means that when the pole core is subjected to external vibration, impact or other mechanical stress, the end of the tab can displace or swing. This displacement can cause the tab to come into contact with other metal components, such as the cover plate or the shell. Since these components are usually conductive, such contact can reduce the insulation of the pole core and increase the risk of short circuit, thereby affecting the safety of the battery.

[0062] Therefore, the present application provides a pole piece structure, a pole core, a battery and an electrical device, wherein the pole piece structure comprises a base body, a tab and an insulating coating; the tab is arranged on one side of the base body, the tab comprises a blank part and a coated part, the blank part is connected to the base body, and the coated part is arranged on the side of the blank part away from the base body; the insulating coating is arranged on the surface of the coated part.

[0063] By arranging the coated part on the side of the blank part away from the base body and applying the insulating coating on the coated part, the insulating coating can form a reliable barrier to prevent the formation of unnecessary current paths. In this way, even under the influence of mechanical stress or vibration, the free end of the tab will not come into contact with metal components such as the cover plate or the shell, effectively isolating it from other conductive components, reducing the likelihood of electrical contact, improving the insulation of the pole core, and ensuring the safety and stability of the pole core under various working conditions.

[0064] The insulating coating not only provides physical isolation, but also has wear-resistant and impact-resistant properties, and can maintain its integrity and functionality when the pole core is subjected to vibration or mechanical stress.

[0065] In addition, the insulating treatment of the coated part does not affect the conductive connection between the blank part and the base body, ensuring the efficiency and stability of current conduction.

[0066] Overall, the present application provides a pole piece structure that significantly improves the safety of the pole core without affecting its performance, especially in complex working environments, significantly reducing the safety hazards caused by mechanical vibration.

[0067] The technical solutions of the present application will be described in detail below in conjunction with the drawings and specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0068] In combination Figure 1 As shown in the drawings, the first aspect of the embodiments of the present application provides a pole piece structure, comprising a substrate body 100, a tab 200 and an insulating coating 300; the tab 200 is arranged on one side of the substrate body 100, the tab 200 comprises a blank part 210 and a coated part 220, the blank part 210 is connected with the substrate body 100, and the coated part 220 is arranged on the side of the blank part 210 away from the substrate body 100; the insulating coating 300 is arranged on the surface of the coated part 220.

[0069] It can be understood that the substrate body 100 is the core structure of the pole piece, which is usually made of high-conductivity material for conducting current. The substrate body 100 provides the necessary mechanical strength and conductive path to ensure efficient transmission of current within the pole core 500.

[0070] The tab 200 is a conductive part extending from the substrate body 100, used to connect the external circuit of the battery. The tab 200 can directly affect the efficiency of current conduction and the connection reliability of the pole core 500. By optimizing the shape and material of the tab 200, resistance loss and mechanical stress can be reduced.

[0071] The tab 200 includes a blank part 210, wherein the blank part 210 is directly connected with the substrate body 100 and does not undergo insulating coating. The blank part 210 can ensure good conductive connection between the tab 200 and the substrate body 100, reduce resistance loss, and by maintaining the conductivity of the blank part 210, efficient conduction of current between the pole core 500 and the external circuit can be ensured.

[0072] The tab 200 includes a coated part 220, which is located on the side of the blank part 210 away from the substrate body 100 and undergoes insulating coating treatment. By arranging the insulating coating 300 on the coated part 220, the insulating properties of the insulating coating 300 can prevent the tab 200 from contacting other conductive components, effectively isolate electrical contact, reduce the risk of short circuit, and improve the safety of the pole core 500, especially under vibration and mechanical stress conditions.

[0073] The insulating coating 300 covers the surface of the coated part 220, forming a reliable barrier, which helps to prevent direct contact between the tab 200 and other metal components, reduces the risk of short circuit and electric leakage, and improves the safety of the pole core 500.

[0074] For example, the insulating coating 300 can be selected from wear-resistant and impact-resistant insulating materials to ensure the durability and effectiveness of the insulating coating 300 under various working conditions, so that the presence of the insulating coating 300 not only provides physical insulation, but also maintains its integrity when the pole core 500 is subjected to vibration or mechanical stress.

[0075] Specifically, the pole piece structure provided by the embodiment of the present application sets the coating part 220 on the side of the blank part 210 of the tab 200 away from the base body 100, and applies the insulating coating 300 on the coating part 220. The insulating coating 300 can form a reliable barrier to prevent the formation of unnecessary current paths. In this way, even under the influence of mechanical stress or vibration, the free end of the tab 200 will not come into contact with metal components such as the cover plate or the shell, effectively isolating the tab 200 from other conductive components, reducing the possibility of electrical contact, improving the insulation of the pole core 500, and ensuring the safety and stability of the pole core 500 under various working conditions. Therefore, the pole piece structure provided by the embodiment of the present application greatly improves the safety of the pole core 500 without affecting the performance of the pole core 500.

[0076] In combination Figure 1 and Figure 3 As shown in FIGS. 1 to 3, in some embodiments, the pole piece structure is a positive pole piece 501, and the base body 100 is a positive base body.

[0077] It can be understood that the pole piece structure is a positive pole piece 501, and the tab 200 connected to the positive pole piece 501 is a positive tab 510.

[0078] By setting the coating part 220 on the side of the blank part 210 of the positive tab 510 away from the positive base body, and applying the insulating coating 300 on the coating part 220, the free end of the positive tab 510 can be prevented from coming into contact with metal components such as the cover plate 600 or the shell, effectively isolating the positive tab 510 from other conductive components, reducing the possibility of electrical contact, improving the insulation of the pole core 500, and ensuring the safety and stability of the pole core 500 under various working conditions.

[0079] For example, the positive base body can be an aluminum foil. Aluminum has good electrical conductivity, corrosion resistance, and lightweight characteristics. As a positive base body, the aluminum foil has good electrical conductivity, which can provide good current collection capability and help improve the energy density of the battery; its corrosion resistance ensures long-term stability in the electrolyte; and its lightweight characteristics help reduce the weight of the pole core 500.

[0080] The surface of the positive base body is provided with an active material layer 400. For the positive pole piece 501, the active material layer 400 on the surface of the positive base body is usually composed of lithium compounds (such as lithium cobalt oxide, lithium nickel manganese cobalt oxide, etc.). Lithium compounds are widely used in positive electrode materials due to their high energy density and good electrochemical stability.

[0081] A conductive coating 700 may also be provided on the surface of the active material layer 400 to improve the contact between the electrode and the electrolyte, reduce interfacial impedance, and thus improve the rate performance of the battery. Furthermore, the conductive coating 700 can protect the active material from electrolyte corrosion, reduce the occurrence of side reactions, and improve the cycle life of the battery. In addition, the conductive coating 700 also helps prevent the shedding of active material particles during charge-discharge cycles.

[0082] Combination Figure 2 and Figure 4 As shown, in some embodiments, the electrode structure is a negative electrode 502, and the substrate body 100 is a negative electrode substrate body.

[0083] It is understandable that if the electrode structure is a negative electrode 502, then the tab 200 connected to the negative electrode 502 is a negative tab 520.

[0084] By providing a coating portion 220 on the side of the blank portion 210 of the negative electrode tab 520 away from the positive electrode substrate body, and applying an insulating coating 300 on the coating portion 220, the free end of the negative electrode tab 520 can be prevented from contacting other conductive components, thus achieving effective isolation between the negative electrode tab 520 and other conductive components, reducing the possibility of electrical contact, improving the insulation of the electrode core 500, and ensuring the safety and stability of the electrode core 500 under various working conditions.

[0085] For example, the negative electrode substrate can be copper foil. Copper has excellent electrical conductivity and mechanical strength, which can ensure the efficient energy transfer and structural stability of the core 500.

[0086] An active material layer 400 is disposed on the surface of the negative electrode substrate. For the negative electrode sheet 502, the active material layer 400 on the surface of the negative electrode substrate is typically composed of graphite or other carbon-based materials. The layered structure of graphite allows lithium ions to intercalate and deintercalate during charging and discharging, thereby achieving efficient energy storage and release.

[0087] In the electrode structure, the insulating coating 300 on the surface of the tab 200 can be an insulating material. For example, polymer materials, ceramic materials, inorganic materials, and composite materials, etc., can be selected according to the requirements of battery operating temperature, chemical environment, electrical performance, and mechanical strength, etc., and the embodiments of this application do not impose any restrictions in this regard.

[0088] When the electrode structure is a positive electrode 501, the insulating coating 300 on the surface of the positive electrode tab 510 may also include an active material coating. The active material coating may be a combination of an active material (such as lithium iron phosphate) and a binder (such as polyvinylidene fluoride). Specifically, the insulating coating 300 only needs to be sufficient to insulate the free end of the positive electrode tab 510.

[0089] Combination Figure 1 andFigure 2 As shown, in some embodiments, the number of the tab 200 is one, and the length of the tab 200 is less than or equal to the length of the substrate body 100 along the length direction X of the substrate body 100.

[0090] It can be understood that the design of the single tab 200 simplifies the structure of the pole piece 500 and reduces the manufacturing complexity and material cost.

[0091] Specifically, the tab 200 is arranged at one side of the length direction X of the substrate body 100, which can ensure uniform distribution of current on the entire substrate body 100 and reduce the phenomenon of current density concentration, thereby reducing the difficulty of thermal management.

[0092] The length of the tab 200 is less than or equal to the length of the substrate body 100, which can ensure effective current conduction of the tab 200 within the range of the substrate body 100.

[0093] In combination Figure 3 And Figure 4 As shown, in some embodiments, the number of the tab 200 is multiple, and the multiple tabs 200 are arranged at intervals along the length direction X of the substrate body 100.

[0094] It can be understood that the arrangement of multiple tabs 200 on the substrate body 100 can reduce the length of the current path, thereby reducing the internal resistance of the battery. In addition, the multiple tabs 200 can also improve the uniformity of current distribution and reduce the current load of a single tab 200, thereby reducing the risk of resistance loss and local overheating.

[0095] It should be noted that the tab 200 can be provided with an insulating coating 300 on both sides along the thickness direction of the substrate body 100. In this way, the tab 200 can be effectively prevented from contacting other conductive components along the thickness direction of the substrate body 100, thereby reducing the risk of short circuit.

[0096] Further, the tab 200 can be provided with an insulating coating 300 on the circumferential side along the width direction Y of the substrate body 100. In this way, more comprehensive electrical isolation is provided, which can effectively prevent the tab 200 from being electrically contacted in any direction, thereby improving the insulation of the pole piece 500 and ensuring safety under vibration or mechanical stress conditions.

[0097] It should be noted that in the embodiments of the present application, the length direction X of the substrate body 100 refers to the length direction of the substrate body 100 in the unfolded state of the pole piece; the width direction Y of the substrate body 100 refers to the width direction of the substrate body 100 in the unfolded state of the pole piece; and the thickness direction of the substrate body 100 refers to the thickness direction of the substrate body 100 in the unfolded state of the pole piece.

[0098] In some embodiments, the tab 200 and the substrate body 100 are an integrated structure.

[0099] By using a whole piece of substrate to prepare the tab 200 and the substrate body 100, the increase of resistance and the mechanical weakness caused by welding or mechanical connection of the tab 200 and the substrate body 100 in the traditional method can be avoided, and the current conduction efficiency and the mechanical strength of the structure are improved. Moreover, the integrated structure of the tab 200 and the substrate body 100 can also simplify the manufacturing process, reduce the production steps and costs, and improve the consistency and reliability of the product.

[0100] For example, for the winding type electrode core 500, the positive electrode sheet 501 and the negative electrode sheet 502 are wound together with the separator into a cylindrical or elliptical electrode core 500. After winding is completed, the edges of the substrate body 100 can be cut to form a plurality of tabs 200 by a die cutting process. After the substrate body 100 is unfolded, the plurality of tabs 200 can be arranged at intervals along the length direction X of the substrate body 100.

[0101] For the stacking type electrode core 500, the sheet-shaped positive electrode sheet 501, the negative electrode sheet 502 and the separator are stacked together. After stacking is completed, the edges of the substrate body 100 can be cut to form a plurality of tabs 200 by a die cutting process, and the plurality of tabs 200 can be arranged at intervals along the length direction X of the substrate body 100.

[0102] Of course, the tab 200 can also be formed by other methods, and the present application does not limit the forming method of the tab 200.

[0103] It should be further pointed out that the insulating coating 300 on the surface of the tab 200 can be coated on the surface of the tab 200 before winding or stacking, or can be coated on the surface of the stacked tab 200 after winding or stacking.

[0104] There are also some electrode cores 500 that need to cut the end of the tab 200 after the tab 200 is formed to meet the needs of easy installation and the like. But cutting will cause metal wires and metal scraps to remain on the edge of the tab 200. By setting the coating part 220 on the side of the blank part 210 of the tab 200 away from the substrate body 100 and applying the insulating coating 300 on the coating part 220, the insulating coating 300 can be used to cover the part formed after cutting the end of the tab 200, so as to avoid the contact between the remaining metal wires and metal scraps and other battery components, thereby preventing the potential short circuit risk.

[0105] In combination Figure 5 As shown in some embodiments, the width of at least part of the number of tabs 200 along the width direction Y of the substrate body 100 is distributed in a gradient.

[0106] It can be understood that the extension length of the tab 200 along the width direction Y of the substrate body 100 can not be equal, for example, it can be gradually increased. Such a gradient distribution design can optimize the welding performance of the tab 200, avoid the influence of the insulating coating 300 on the welding quality between the tabs 200, and improve the uniformity of current conduction.

[0107] Specifically, by designing the width of the tab 200 to be in a gradient distribution, the physical overlap between the tabs 200 and the influence of the insulating coating 300 on welding can be effectively reduced. Such a design allows easier access to each tab 200 during welding, ensuring the reliability and conductivity of the welding. In addition, the gradient distribution helps to optimize the size of the tab 200 under different current requirements, ensuring that each tab 200 can effectively conduct the required current.

[0108] For example, the width of a part of the number of tabs 200 along the width direction Y of the substrate body 100 can be set in the form of an arithmetic progression or in the form of a geometric progression, etc.

[0109] Alternatively, the width of all tabs 200 along the width direction Y of the substrate body 100 can be set in the form of an arithmetic progression or in the form of a geometric progression, etc.

[0110] In some embodiments, the width of at least a part of the number of coating portions 220 along the width direction Y of the substrate body 100 is equal.

[0111] It can be understood that the coating portion 220 with equal width can simplify the manufacturing process, ensure the uniformity and consistency of the insulating coating 300, and thus improve the insulation performance of the core 500.

[0112] Specifically, by setting the width of the coating portion 220 to be equal, the forming process of the insulating coating 300 can be simplified, and the process complexity and material waste can be reduced. In this way, each coating portion 220 is subjected to the same treatment during the manufacturing process, which helps to ensure the consistency of the thickness and performance of the insulating layer, thereby improving the reliability of electrical isolation. In addition, the coating portion 220 with equal width also helps to achieve more accurate alignment and connection during assembly of the core 500.

[0113] In combination Figure 5 As shown, in some embodiments, the width of at least a part of the number of coating portions 220 along the width direction Y of the substrate body 100 is in a gradient distribution.

[0114] It can be understood that the gradient distribution of the coating part 220 can avoid all the coating parts 220 being stacked together when the tab 200 is stacked, so as to avoid the overall thickness of the free end of the tab 200 being too large. In addition, the gradient distribution of the coating part 220 can also effectively reduce the coverage of the insulating coating 300 on the welding area of the tab 200, so as to avoid the obstacle in welding, so that the conductive part of the tab 200 is more easily contacted in the welding process, and the reliability and conductivity of welding are ensured.

[0115] For example, the width of the coating part 220 along the width direction Y of the substrate body 100 can be set in the form of an arithmetic progression or a geometric progression, etc.

[0116] Alternatively, the width of all the coating parts 220 along the width direction Y of the substrate body 100 can be set in the form of an arithmetic progression or a geometric progression, etc.

[0117] In some embodiments, the thickness of the coating part 220 is less than the thickness of the blank part 210 along the thickness direction of the substrate body 100.

[0118] By setting the thickness of the coating part 220 to be less than the thickness of the blank part 210, the overall thickness of the region corresponding to the coating part 220 of the tab 200 can be avoided during winding or stacking, so as to reduce the interference with the surrounding structure during the assembly of the pole core 500, and ensure the compactness and stability of the battery. At the same time, the small thickness of the coating part 220 also helps to reduce the overall weight of the pole core 500, while ensuring that the insulation performance of the coating part 220 is not affected.

[0119] In some embodiments, the pole piece structure further comprises an active material layer 400 coated on the surface of the substrate body 100.

[0120] It should be noted that for the positive pole piece 501, the active material layer 400 can be composed of lithium compounds (such as lithium cobalt oxide, lithium nickel manganese cobalt oxide, etc.). For the negative pole piece 502, the active material layer 400 can be composed of graphite or other carbon-based materials.

[0121] The thickness of the insulating coating 300 is less than the thickness of the active material layer 400 along the thickness direction of the substrate body 100.

[0122] By setting the thickness of the insulating coating 300 to be less than the thickness of the active material layer 400, the overall thickness of the tab 200 can be avoided during winding or stacking, so as to reduce the interference with the surrounding structure during the assembly of the pole core 500, and ensure the compactness and stability of the battery. In addition, the small thickness of the insulating coating 300 also helps to reduce the material cost and the overall weight of the pole core 500.

[0123] In combination withFigure 6 and Figure 7 As shown, a second aspect of this application provides an electrode core 500, including a positive electrode 501, a negative electrode 502, and a separator, wherein the separator is disposed between the positive electrode 501 and the negative electrode 502; at least one of the positive electrode 501 and the negative electrode 502 includes the electrode structure provided in any of the above embodiments.

[0124] The electrode structure has been described in detail in the above embodiments and will not be repeated here.

[0125] Understandably, the positive electrode 501 and the negative electrode 502 store and release lithium ions respectively, while the separator prevents electrons from passing through directly, while allowing lithium ions to pass through, thereby realizing the electrochemical reaction of the battery.

[0126] At least one of the positive electrode 501 or negative electrode 502 of the electrode core 500 uses the electrode structure provided in the above embodiment, which can provide effective protection for the free end of the electrode tab 200. Even under the influence of mechanical stress or vibration, the free end of the electrode tab 200 will not come into contact with metal parts such as the cover plate 600 or the housing, thus achieving effective isolation from other conductive parts, reducing the possibility of electrical contact, improving the insulation of the electrode core 500, and ensuring the safety and stability of the electrode core 500 under various working conditions.

[0127] Combination Figure 8 As shown, a third aspect of this application provides a battery including a cover plate 600 and an electrode core 500 provided in any of the above embodiments, with a blank portion 210 electrically connected to the cover plate 600.

[0128] The Extreme Core 500 has been described in detail in the above embodiments and will not be repeated here.

[0129] The cover plate 600 provides mechanical protection and sealing to prevent external environmental influences on the battery's interior and ensure its safety and stability. The blanking portion 210 is electrically connected to the cover plate 600, ensuring effective current conduction within the battery.

[0130] The battery core 500 includes the electrode structure provided in the above embodiments, which can improve the safety of the connection between the core 500 and the cover plate 600. Under the influence of mechanical stress or vibration, the free end of the tab 200 will not come into contact with the cover plate 600 or other metal parts such as the casing, thus achieving effective isolation from other conductive parts, reducing the possibility of electrical contact, improving the insulation of the core 500, and ensuring the safety and stability of the battery under various working conditions.

[0131] Combination Figure 9 As shown, in some embodiments, the battery also includes a connecting piece 620, through which the blank portion 210 is electrically connected to the cover plate 600.

[0132] Understandably, connector 620 is typically made of highly conductive materials (such as copper or aluminum) to ensure low resistance and efficient current conduction. Connector 620 provides a reliable electrical connection path, ensuring effective current conduction within the battery and enhancing the battery's mechanical stability.

[0133] By using the connecting piece 620, the electrical connection between the blank portion 210 of the battery and the cover plate 600 can be achieved without direct welding. This reduces thermal stress and damage to the cover plate 600 that may occur during welding, ensuring the structural stability of the cover plate 600. Furthermore, the use of the connecting piece 620 helps simplify the battery assembly process, improves production efficiency, and allows for more flexible battery design and layout.

[0134] Combination Figure 8 and Figure 9 As shown, in some embodiments, the tabs 200 of the positive electrode 501 and the tabs 200 of the negative electrode 502 are led out from the same side of the electrode core 500.

[0135] By leading the tabs 200 of the positive electrode 501 and the negative electrode 502 out from the same side, cross-connections within the battery can be reduced, lowering manufacturing complexity and cost. Simultaneously, this method of leading the tabs 200 out from the same side also helps shorten the current path, reduce resistance loss, and improve battery efficiency. Furthermore, this method also allows for a more compact battery package, suitable for applications requiring high integration and miniaturization.

[0136] Combination Figure 10 As shown, in some embodiments, the tabs 200 of the positive electrode 501 and the tabs 200 of the negative electrode 502 are led out from different sides of the electrode core 500.

[0137] By drawing the tabs 200 of the positive electrode 501 and the tabs 200 of the negative electrode 502 from different sides, better current distribution and thermal management can be achieved, making it suitable for battery applications that require high power output and high safety.

[0138] For example, the tabs 200 of the positive electrode 501 and the tabs 200 of the negative electrode 502 can be extended to the opposite side of the electrode core 500.

[0139] In some embodiments, the battery further includes a housing, a cover plate 600 covering the housing, and an electrode core 500 disposed inside the housing; the positive electrode 501 and the negative electrode 502 are electrically connected to the cover plate 600 respectively.

[0140] The shell can provide mechanical protection, waterproof and dustproof, and electromagnetic shielding functions, ensuring the stability and safety of the battery under various environmental conditions. The shell can be made of metal or high-strength plastic, capable of withstanding external pressure, impact, and environmental corrosion.

[0141] The cover plate 600 can be fixedly connected with the shell by welding, bolting, or buckling, etc., to ensure its stability under mechanical vibration and thermal expansion and contraction conditions.

[0142] Specifically, the blank part 210 of the positive tab 510 in the positive sheet 501 is electrically connected with the pole 610 of the cover plate 600, and the blank part 210 of the negative tab 520 in the negative sheet 502 is electrically connected with the pole 610 of the cover plate 600. Electrically connecting the positive sheet 501 and the negative sheet 502 with the cover plate 600 helps to reduce the internal resistance of the battery and improve the charging and discharging efficiency.

[0143] In some embodiments, the positive sheet 501 is electrically connected with the cover plate 600, and the negative sheet 502 is electrically connected with the shell.

[0144] Specifically, the blank part 210 of the positive tab 510 in the positive sheet 501 is electrically connected with the pole 610 of the cover plate 600, and the blank part 210 of the negative tab 520 in the negative sheet 502 is directly electrically connected with the shell.

[0145] By utilizing the shell for conduction, the current of the negative electrode can be dispersed, reducing the risk of local overheating. If the cover plate 600 fails to insulate, the shell can serve as a backup negative electrode, avoiding direct short circuit.

[0146] The fourth aspect of the embodiments of the present application provides a power consuming device, which includes the pole core 500 provided by any of the above embodiments, or the battery provided by any of the above embodiments.

[0147] The pole core 500 and the battery have been described in detail in the above embodiments, and will not be repeated here.

[0148] The power consuming device can include, but is not limited to, a mobile phone, a tablet, a notebook computer, a wearable electronic product, an electric bicycle, an electric vehicle, etc.

[0149] By setting the pole core 500 or the battery in the above embodiments in the power consuming device, the safety of the connection between the pole core 500 and the cover plate 600 can be improved, so that the free end of the tab 200 will not come into contact with the metal parts such as the cover plate 600 or the shell under the influence of mechanical stress or vibration, achieving effective isolation from other conductive parts, reducing the possibility of electrical contact, improving the insulation of the pole core 500, ensuring the stability of the battery under various working conditions, and further improving the safety of the power consuming device.

[0150] It should be understood that the application is not limited to the precise construction hereinafter described and as shown in the attached drawings, and that changes can be made to the application embodiments disclosed without departing from the scope of the application. The application is not limited to the exact details shown and described herein. The application is defined by the claims.

[0151] It is to be understood that the application is not limited to the precise construction hereinafter described and as shown in the attached drawings, and that changes can be made to the application embodiments disclosed without departing from the scope of the application. The scope of the application is limited only by the claims that follow.

Claims

1. An electrode structure, characterized in that, It includes a substrate body (100), tabs (200), and an insulating coating (300). The tab (200) is disposed on one side of the substrate body (100). The tab (200) includes a blank portion (210) and a coating portion (220). The blank portion (210) is connected to the substrate body (100), and the coating portion (220) is disposed on the side of the blank portion (210) away from the substrate body (100). The insulating coating (300) is disposed on the surface of the coated portion (220).

2. The electrode structure according to claim 1, characterized in that, The number of tabs (200) is one, and the length of the tab (200) along the length direction of the substrate body (100) is less than or equal to the length of the substrate body (100).

3. The electrode structure according to claim 1, characterized in that, The number of tabs (200) is multiple, and the multiple tabs (200) are arranged at intervals along the length direction of the substrate body (100).

4. The electrode structure according to claim 3, characterized in that, Along the width direction of the substrate body (100), at least a portion of the tabs (200) have a gradient width distribution.

5. The electrode structure according to claim 3, characterized in that, Along the width direction of the substrate body (100), at least a portion of the coating portions (220) have equal widths, or at least a portion of the coating portions (220) have gradient widths.

6. The electrode structure according to any one of claims 1-5, characterized in that, The electrode structure is a positive electrode, the substrate body (100) is a positive electrode substrate body, and the insulating coating (300) includes an active material coating; Alternatively, the electrode structure may be a negative electrode, and the substrate body (100) may be a negative electrode substrate body.

7. The electrode structure according to any one of claims 1-5, characterized in that, Along the thickness direction of the substrate body (100), the thickness of the coated portion (220) is less than the thickness of the blank portion (210).

8. The electrode structure according to any one of claims 1-5, characterized in that, It also includes an active material layer (400) coated on the surface of the substrate body (100).

9. The electrode structure according to claim 8, characterized in that, Along the thickness direction of the substrate body (100), the thickness of the insulating coating (300) is less than the thickness of the active material layer (400).

10. The electrode structure according to any one of claims 1-5, characterized in that, The tab (200) and the substrate body (100) are an integral structure.

11. An electrode core, characterized in that, It includes a positive electrode (501), a negative electrode (502) and a separator, wherein the separator is disposed between the positive electrode (501) and the negative electrode (502); At least one of the positive electrode (501) and the negative electrode (502) comprises the electrode structure according to any one of claims 1-10.

12. A battery, characterized in that, Includes a cover plate (600) and an electrode core (500) as claimed in claim 11, wherein the blank portion (210) is electrically connected to the cover plate (600).

13. The battery according to claim 12, characterized in that, It also includes a connecting piece (620), through which the blank portion (210) is electrically connected to the cover plate (600).

14. The battery according to claim 12, characterized in that, The tabs (200) of the positive electrode (501) and the tabs (200) of the negative electrode (502) are located on the same side of the electrode core (500), or the tabs (200) of the positive electrode (501) and the tabs (200) of the negative electrode (502) are located on different sides of the electrode core (500).

15. The battery according to claim 12, characterized in that, It also includes a housing, the cover plate (600) covering the housing, and the pole core (500) disposed inside the housing; The positive electrode (501) and the negative electrode (502) are electrically connected to the cover plate (600) respectively, or the positive electrode (501) is electrically connected to the cover plate (600) and the negative electrode (502) is electrically connected to the housing.

16. An electrical appliance, characterized in that, Includes the electrode core as described in claim 11, or the battery as described in any one of claims 12-15.

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