Pole piece, battery cell and battery comprising battery cell
By controlling the width of the empty foil area to 6mm-12mm and setting an adapter in the empty foil area, the problem of strip breakage during electrode rolling was solved, the production quality and connection reliability of the electrode tabs were improved, and efficient electrode production was achieved.
Patent Information
- Application Number
- CN202422284674.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-19
- Publication Date
- 2025-10-28
- Estimated Expiration
- 2034-09-19
AI Technical Summary
In pouch cells and aluminum-cased cells, when using 10-micron-thick aluminum foil as the current collector, the empty foil area on the electrode is prone to breakage during the rolling process, affecting production efficiency and the reliability of the tab connection.
By strictly controlling the width of the empty foil area to 6mm-12mm and setting conductive adapters in the empty foil area to extend its length, tape breakage during rolling is avoided, thereby improving the production quality and connection reliability of the tabs.
This effectively avoids wrinkles and breakage in the empty foil area during rolling, improves the production quality and connection reliability of the tabs, ensures the production efficiency of the electrode sheets, and reduces raw material loss.
Smart Images
Figure CN223487067U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of battery technology, and in particular to an electrode, a battery cell, and a battery containing the battery cell. Background Technology
[0002] Batteries are widely used in electronic products, electric vehicles, and many other fields due to their advantages such as being green and environmentally friendly, having high operating voltage, and having good cycle life. As electronic devices become smaller and people demand more space in electric vehicles, the energy density of batteries is becoming increasingly important.
[0003] Due to the demand for high energy density, there is an increasing need to use 10-micron-thick aluminum foil as current collectors in pouch cells and aluminum-cased batteries. However, the thinner the aluminum foil, the easier it is to break during rolling; the empty foil area on the electrode (the part on the current collector used to cut out the tabs) is difficult to extend during rolling. If the rolling pressure is increased, the empty foil area is prone to breakage, affecting the production efficiency of the electrode.
[0004] Therefore, there is an urgent need for an electrode that can solve the above problems. Utility Model Content
[0005] According to one aspect of this utility model, an electrode sheet is proposed to avoid the problem of roll breakage in the empty foil area.
[0006] To achieve this objective, the present invention adopts the following technical solution:
[0007] An electrode includes a coated area and an empty foil area disposed adjacent to the coated area. The coated area is provided with an active material layer, and the empty foil area is used to form an electrode tab. The width of the empty foil area is 6mm-12mm.
[0008] In this invention, the electrode can be either a positive electrode or a negative electrode. When the electrode is a positive electrode, the active material in the active material layer is a positive active material; when the electrode is a negative electrode, the active material in the active material layer is a negative active material.
[0009] This invention reduces the width of the empty foil area by strictly controlling it compared to existing technologies. This prevents wrinkles from forming in the empty foil area during the rolling process and makes the strip less prone to breakage during rolling. This improves the production quality of the tabs, ensures the production efficiency of the electrode sheets, and ultimately enhances the connection reliability of the tabs.
[0010] In this invention, if the width of the empty foil area is too small, it is not convenient to weld other objects that can conduct electricity outward in the empty foil area, and it is impossible to achieve electrical connection with the pole; if the width of the empty foil area is too large, the tape is prone to breakage during rolling.
[0011] As an alternative, the thickness of the active material layer is 0.5μm-30μm, for example, it can be 0.5μm, 1μm, 3μm, 5μm, 6μm, 8μm, 10μm, 15μm, 20μm, 25μm or 30μm, etc.
[0012] As an alternative, at least one side surface of the empty foil area is further provided with a conductive adapter to extend the empty foil area.
[0013] As an alternative, an adapter is provided on one side surface of the empty foil area.
[0014] As an optional solution, adapters are provided on both sides of the empty foil area. By providing adapters on both sides of the empty foil area, the connection stability with the pole can be ensured.
[0015] As an optional feature, the length of the adapter is >12mm.
[0016] As an optional solution, the thickness of the adapter is the same as the thickness of the empty foil area. The adapter is flexible and easy to bend. On the one hand, this avoids the overall thickness of the empty foil area being greater than the overall thickness of the corresponding area of the active material layer after the electrode is stacked, which would affect the overall energy density of the battery; on the other hand, it facilitates welding with the empty foil area to achieve the connection between the electrode and the electrode post, ensuring the connection reliability of the empty foil area.
[0017] As an alternative, the adapter is made of metal, specifically the same metal foil as the empty foil area. This improves welding strength and ensures good conductivity. For example, both the adapter and the empty foil area are made of 10μm thick aluminum foil.
[0018] As an alternative, the thickness of the empty foil region is 0.5μm-5μm.
[0019] As an optional solution, the adapter is at least located in the empty foil area where the tab is formed. This invention reduces the width of the empty foil area by extending it through the adapter. Since the tab is generally formed by cutting the empty foil area, the adapter should at least be located in the tab-forming position. Furthermore, it is preferable to only locate the adapter in the empty foil area where the tab is formed, thus reducing material loss.
[0020] As an alternative, one end of the adapter is welded to the empty foil area, and the other end extends out of the empty foil area.
[0021] As an optional solution, the electrode tab is a conductive body obtained by cutting the empty foil area and the adapter disposed in the empty foil area along the width direction of the empty foil area. For empty foil without an adapter, the conductive body here is the cut empty foil; for empty foil with an adapter, the conductive body here is the cut empty foil with the adapter extended in width.
[0022] By way of example, the present invention provides a method for preparing an electrode sheet, comprising the following steps:
[0023] (1) A paste of active material is coated on the surface of a metal foil, dried, and then rolled to obtain an electrode sheet;
[0024] The area coated with active substance slurry is called the coating area, and the area not coated with active substance slurry is called the empty foil area. The coating area and the empty foil area are arranged adjacent to each other, and the width of the empty foil area is 6mm-12mm.
[0025] (2) A conductive adapter is provided on at least one side surface of the empty foil area to extend the empty foil area;
[0026] (3) Cut the extended empty foil area using the adapter to form the electrode tab;
[0027] The cutting direction is along the width of the empty foil area.
[0028] According to another aspect of the present invention, a battery cell is provided, the battery cell comprising cross-stacked positive electrode plates and negative electrode plates, wherein a separator is disposed between the positive electrode plates and the negative electrode plates, and the positive electrode plates and / or the negative electrode plates are electrode plates as described above.
[0029] Wherein, when the electrode is used as a positive electrode, the active material is a positive electrode active material; when the electrode is used as a negative electrode, the active material is a negative electrode active material.
[0030] The function of the diaphragm is to insulate the positive and negative electrodes, preventing short circuits caused by contact between them.
[0031] In this invention, the positive electrode and the negative electrode are stacked in a cross manner, and the separator separates the positive electrode and the negative electrode. For example, they can be stacked in the following order: negative electrode, separator, positive electrode, separator, negative electrode, separator, positive electrode, separator, ..., negative electrode, separator, positive electrode, separator, negative electrode.
[0032] As an alternative, when the electrode is used as the positive electrode, the empty foil area is made of aluminum foil; when the electrode is used as the negative electrode, the empty foil area is made of copper foil.
[0033] According to another aspect of the present invention, a battery is provided, the battery comprising a housing, the aforementioned battery cell and a top cover, the housing and the top cover encapsulating the battery cell within the housing, and the electrode tabs of the battery cell being connected to the terminals of the top cover so that the electrode plates supply power to external electrical devices.
[0034] As an alternative, the housing and top cover are separate components, with the top cover covering the open end of the housing and encapsulating the battery cell inside the housing.
[0035] As an alternative, the housing and top cover are integrally molded. For example, before the battery cell is inserted into the housing, the housing and top cover are first formed into a common connection surface. After the battery cell is installed into the housing, the top cover is then closed to seal the housing.
[0036] As an alternative, the shape of the casing can be determined according to the shape and size of the battery cell. For example, the shape of the casing can be a cuboid, a cylinder, etc.
[0037] As an optional option, the casing material may include, but is not limited to, copper, iron, aluminum, aluminum alloy, or stainless steel.
[0038] As an optional option, the material of the top cover includes, but is not limited to, copper, iron, aluminum, aluminum alloy, or stainless steel.
[0039] As an alternative, the electrode includes a positive electrode and a negative electrode, which are respectively connected to the positive tab and the negative electrode plate.
[0040] In this invention, the positive and negative electrodes can be on the same side or on different sides, and those skilled in the art can choose according to their needs.
[0041] According to another aspect of the present invention, an electrical device is provided, including the battery described above.
[0042] In this invention, the electrical equipment can take many forms, including but not limited to mobile phones, laptops, electronic watches, electric toys, power tools, electric vehicles, electric cars, and aerospace devices.
[0043] The beneficial effects of this utility model are:
[0044] The electrode sheet provided by this utility model reduces the width of the empty foil area by strictly controlling the width of the empty foil area compared with the prior art. This prevents wrinkles from appearing in the empty foil area during the rolling process and makes it less prone to strip breakage during rolling. This improves the production quality of the electrode tabs, ensures the production efficiency of the electrode sheet, and thus improves the connection reliability of the electrode tabs. Attached Figure Description
[0045] Figure 1This is a schematic diagram of the structure of an electrode sheet provided in one embodiment of the present invention.
[0046] Figure 2 This is a schematic diagram of the structure of an electrode sheet provided in one embodiment of the present invention.
[0047] Figure 3 This is a schematic diagram of the structure of an electrode sheet provided in one embodiment of the present invention.
[0048] Figure 4 This is a schematic diagram of the structure of an electrode sheet provided in one embodiment of the present invention.
[0049] Figure 5 and Figure 6 These are schematic diagrams of the electrode sheet before and after cutting, in which... Figure 5 Before cutting, Figure 6 After corresponding cutting, Figure 5 The dotted lines in the text indicate the cutting positions.
[0050] Figure 7 This is a schematic diagram of the structure of a laminate provided in one embodiment of the present invention.
[0051] In the picture:
[0052] 1. Empty foil area; 2. Active material layer; a. Width of empty foil area; 3. Connector; 4. Positive electrode; 5. Negative electrode; 6. Separator. Detailed Implementation
[0053] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for explaining this utility model and not for limiting it. Furthermore, it should be noted that, for ease of description, only the parts related to this utility model are shown in the drawings, not all of them.
[0054] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0055] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0056] In the description of the embodiments disclosed herein, the terms "upper," "lower," "left," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings, and are used only for ease of description and simplification of operation. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, the terms "first" and "second" are merely used for distinction in description and have no special meaning.
[0057] like Figure 1 As shown, one embodiment of this disclosure provides an electrode sheet, including a coated area and an empty foil area 1 disposed adjacent to the coated area. The coated area is provided with an active material layer 2, and the empty foil area 1 is used to form an electrode tab. The width 'a' of the empty foil area is 6mm-12mm, for example, it can be 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 10mm, 10.5mm, 11mm or 12mm, etc.
[0058] In this invention, the electrode can be either a positive electrode or a negative electrode. When the electrode is a positive electrode, the active material in the active material layer is a positive active material; when the electrode is a negative electrode, the active material in the active material layer is a negative active material.
[0059] This invention reduces the width of the empty foil area by strictly controlling it, compared to existing technologies. This prevents wrinkles from forming in the empty foil area during the rolling process, improving the production quality of the electrode tabs and thus enhancing the connection reliability of the electrode tabs.
[0060] In this invention, if the width of the empty foil area is too small, it is not convenient to weld other objects that can conduct electricity outward in the empty foil area, and it is impossible to achieve electrical connection with the pole; if the width of the empty foil area is too large, the tape is prone to breakage during rolling.
[0061] As an optional implementation, the thickness of the active material layer 2 is 0.5μm-30μm, for example, it can be 0.5μm, 1μm, 3μm, 5μm, 6μm, 8μm, 10μm, 15μm, 20μm, 25μm or 30μm.
[0062] As an optional implementation, such as Figure 2 As shown, at least one side surface of the empty foil area 1 is further provided with a conductive adapter 3 to extend the empty foil area. Extending the empty foil area in this way facilitates the cutting of the tabs and makes it easier to connect the electrode sheet and the electrode post.
[0063] As an optional implementation, such as Figure 3 As shown, an adapter is provided on one side surface of the empty foil area.
[0064] As an optional implementation, such as Figure 4 As shown, adapters are provided on both sides of the empty foil area. By providing adapters on both sides of the empty foil area, the connection stability with the pole can be ensured.
[0065] As an optional implementation, the length b of the adapter is greater than 12mm, for example, it can be 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm or 25mm, etc.
[0066] As an optional implementation, the thickness of the adapter is the same as the thickness of the empty foil area. The adapter is flexible and easy to bend. On the one hand, this avoids the overall thickness of the empty foil area being greater than the overall thickness of the corresponding area of the active material layer after the electrode is stacked, which would affect the overall energy density of the battery; on the other hand, it facilitates welding with the empty foil area to achieve the connection between the electrode and the electrode post, ensuring the connection reliability of the empty foil area.
[0067] As an optional implementation, the adapter is made of the same metal foil as the empty foil area, which helps to improve the welding strength and ensure good conductivity. For example, both the adapter and the empty foil area are 10μm thick aluminum foil.
[0068] As an optional implementation, the thickness of the empty foil area is 0.5μm-5μm, for example, it can be 0.5μm, 1μm, 1.5μm, 2μm, 2.5μm, 3μm, 3.5μm, 4μm, 4.5μm, or 5μm. As an optional solution, the adapter is at least disposed at the position in the empty foil area used to form the electrode tab. This invention reduces the width of the empty foil area and extends the width of the empty foil area by providing the adapter. Since the electrode tab is generally formed by cutting the empty foil area, the adapter should at least be disposed at the position used to form the electrode tab. Further, it is preferable to only dispose of it at the position in the empty foil area used to form the electrode tab, which can reduce material loss.
[0069] As an optional implementation, such as Figure 3 and Figure 4 As shown, one end of the adapter is welded to the empty foil area, and the other end extends out of the empty foil area.
[0070] As an optional implementation, the tab is a conductor obtained by cutting the empty foil area and the adapter disposed in the empty foil area along the width direction of the empty foil area. For an empty foil without an adapter, the conductor here is the cut empty foil; for an empty foil with an adapter, the conductor here is the cut empty foil with the adapter extending its width.
[0071] By way of example, the present invention provides a method for preparing an electrode sheet, comprising the following steps:
[0072] (1) A paste of active material is coated on the surface of a metal foil, dried, and then rolled to obtain an electrode sheet;
[0073] The area coated with active substance slurry is called the coating area, and the area not coated with active substance slurry is called the empty foil area. The coating area and the empty foil area are arranged adjacent to each other.
[0074] (2) A conductive adapter is provided on at least one side surface of the empty foil area to extend the empty foil area;
[0075] (3) Cut the extended empty foil area using the adapter to form the electrode tab;
[0076] The cutting direction is along the width of the empty foil area (see comparison image before and after cutting). Figure 5 and Figure 6 (where the dotted line indicates the cutting position).
[0077] As an optional implementation, the active material slurry in step (1) includes an active material, a conductive agent, a binder, and a solvent.
[0078] As an optional implementation, the active material is either a negative electrode active material or a positive electrode active material.
[0079] As an alternative implementation, the negative electrode active material includes a lithium-based negative electrode active material, which contains, for example, lithium metal and / or lithium alloy.
[0080] As an alternative implementation, the negative electrode active material includes a silicon-based negative electrode active material containing silicon, such as silicon alloys and / or silicon oxide. In one implementation, the silicon-based negative electrode active material may also be mixed with graphite.
[0081] As an alternative implementation, the negative electrode active material includes a carbon-based negative electrode active material, which comprises any one or a combination of at least two of graphite, graphene, or carbon nanotubes (CNTs).
[0082] As an optional implementation, the negative electrode active material includes one or more lithium-accepting negative electrode active materials, such as lithium titanium oxide (Li4Ti5O). 12 Transition metals (e.g., Sn), metal oxides (e.g., V₂O₅), tin oxide (SnO), titanium dioxide (TiO₂), and titanium niobium oxide (TiO₂) x Nb y O z , where 0≤x≤2, 0≤y≤24, 0≤z≤64, metal alloys (e.g., copper-tin alloy (Cu6Sn5)) or metal sulfides (e.g., iron sulfide (FeS)) are any one or a combination of at least two of them.
[0083] As an optional implementation, the conductive agent includes any one or a combination of at least two of carbon-based materials, powdered nickel, other metal particles, or conductive polymers. Optionally, the carbon-based material may include at least one particle selected from carbon black, graphite, SuperP, acetylene black (e.g., KETCHENTM black or DENKATM black), carbon fibers, carbon nanotubes, or graphene. Optionally, the conductive polymer may include at least one of polyaniline, polythiophene, polyacetylene, polypyrrole, or poly(3,4-ethylenedioxythiophene)polysulfonated styrene.
[0084] As an alternative implementation, the adhesive includes poly(tetrafluoroethylene) (PTFE), sodium carboxymethyl cellulose (CMC), styrene-butadiene rubber (SBR), polyvinylidene fluoride (PVDF), nitrile rubber (NBR), styrene-ethylene-butene-styrene copolymer (SEBS), styrene-butadiene-styrene copolymer (SBS), lithium polyacrylate (LiPAA), sodium polyacrylate (NaPAA), sodium alginate, lithium alginate, and combinations thereof.
[0085] As an alternative implementation, the positive electrode active material includes one of layered oxide cathode, spinel cathode, olivine cathode or polyanion cathode.
[0086] As an alternative implementation, the layered oxide cathode (e.g., a rock salt layered oxide cathode) comprises one or more lithium-based positive electrode active materials selected from: LiCoO2 (LCO), LiNi a Mn b Co 1-a-b O2 (where 0≤a≤1, 0≤b≤1), LiNi 1-c-d Co c Al d O2 (where 0≤c≤1 and 0≤d≤1), LiNi e Mn 1-e O2 (where 0 ≤ e ≤ 1) or Li 1+f MO2 (where M is any one or at least two of Mn, Ni, Co or Al, and 0≤f≤1) is any one or at least two of the following:
[0087] As an alternative implementation, the spinel cathode comprises one or more lithium-based positive electrode active materials selected from LiMn2O4 (LMO) and LiNi. 0.5 Mn 1.5 O4.
[0088] As an alternative implementation, the olivine-type cathode comprises one or more lithium-based positive electrode active materials, LiMPO4 (where M is at least one of Fe, Ni, Co, and Mn).
[0089] As an alternative implementation, the polyanionic cathode comprises one or more lithium-based positive electrode active materials: phosphates and / or silicates, such as LiV2(PO4)3 for phosphates and LiFeSiO4 for silicates.
[0090] As an optional implementation, based on the total mass of the active material, conductive agent, and binder as 100%, the content of each component satisfies the following: 70%-97% of the negative electrode active material, 1.5%-15% of the conductive material, and 1.5%-15% of the binder.
[0091] As an optional implementation, when the electrode is a positive electrode, the metal foil is aluminum foil.
[0092] As an optional implementation, when the electrode is a negative electrode, the metal foil is copper foil.
[0093] According to another aspect of this utility model, a battery cell is provided, such as... Figure 7As shown, the battery cell includes a positive electrode 4 and a negative electrode 5 stacked in a cross manner. The positive electrode 4 has a positive electrode tab 41, and the negative electrode 5 has a negative electrode tab 51. A separator 6 is disposed between the positive electrode 4 and the negative electrode 5. The positive electrode 4 and / or the negative electrode 5 adopt the electrode plates described above.
[0094] Wherein, when the electrode is used as a positive electrode, the active material is a positive electrode active material; when the electrode is used as a negative electrode, the active material is a negative electrode active material.
[0095] The function of the diaphragm is to insulate the positive and negative electrodes, preventing short circuits caused by contact between them.
[0096] In this invention, the positive electrode and the negative electrode are stacked in a cross manner, and the separator separates the positive electrode and the negative electrode. For example, they can be stacked in the following order: negative electrode, separator, positive electrode, separator, negative electrode, separator, positive electrode, separator, ..., negative electrode, separator, positive electrode, separator, negative electrode.
[0097] As an optional implementation, when the electrode is used as the positive electrode, the empty foil area is aluminum foil; when the electrode is used as the negative electrode, the empty foil area is copper foil.
[0098] According to another embodiment of the present invention, a battery is provided, the battery including a housing, the aforementioned battery cell and a top cover, the housing and the top cover encapsulating the battery cell inside the housing, the positive electrode and the negative electrode of the battery cell being respectively connected to the terminal post of the top cover so that the electrode plate supplies power to external electrical devices.
[0099] As an alternative implementation, the housing and the top cover are separate components, with the top cover covering the open end of the housing and encapsulating the battery cell inside the housing.
[0100] As an optional implementation, the housing and top cover are integrally molded. For example, before the battery cell is inserted into the housing, the housing and top cover are first formed to form a common connection surface. After the battery cell is installed into the housing, the top cover is then closed to seal the housing.
[0101] As an alternative implementation, the shape of the casing can be determined according to the shape and size of the battery cell. For example, the shape of the casing can be a cuboid, a cylinder, etc.
[0102] As an optional implementation, the material of the housing includes, but is not limited to, copper, iron, aluminum, aluminum alloy, or stainless steel.
[0103] As an alternative implementation, the material of the top cover may include, but is not limited to, copper, iron, aluminum, aluminum alloy, or stainless steel.
[0104] As an optional implementation, the electrode post includes a positive electrode post and a negative electrode post, which are respectively connected to the positive electrode tab and the negative electrode plate.
[0105] In this invention, the positive and negative electrodes can be on the same side or on different sides, and those skilled in the art can choose according to their needs.
[0106] According to another embodiment of the present invention, an electrical device is provided, including the battery described above.
[0107] In this invention, the electrical equipment can take many forms, including but not limited to mobile phones, laptops, electronic watches, electric toys, power tools, electric vehicles, electric cars, and aerospace devices.
[0108] Based on the above implementation methods, the following typical but not limiting embodiments are provided:
[0109] Example 1
[0110] A type of electrode, such as Figure 5 As shown, the electrode includes a coating area and an empty foil area 1 adjacent to the coating area. An active material layer 2 is disposed within the coating area. The empty foil area 1 is used to form an electrode tab. The width of the empty foil area 1 is 8 mm, and the material of the empty foil area 1 is aluminum foil. After rolling, aluminum foil is welded to both sides of the empty foil area 1 as an adapter 3. The length of the adapter 3 is 15 mm. Figure 5 Cut along the dotted lines shown to form tabs.
[0111] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.
Claims
1. An electrode sheet, characterized in that, The electrode includes a coating area and an empty foil area adjacent to the coating area. The coating area is provided with an active material layer, and the empty foil area is used to form an electrode tab. The width of the empty foil area is 6mm-12mm. Conductive adapters are provided on both sides of the empty foil area, and the adapters are used to extend the empty foil area.
2. The electrode sheet according to claim 1, characterized in that, The length of the adapter is >12mm; and / or The thickness of the adapter is the same as the thickness of the empty foil area.
3. The electrode sheet according to claim 1, characterized in that, The adapter is made of the same metal foil as the empty foil area.
4. The electrode sheet according to claim 1, characterized in that, The adapter is at least located in the empty foil area where the tab is formed.
5. The electrode sheet according to claim 1, characterized in that, One end of the adapter is welded to the empty foil area, and the other end extends out of the empty foil area.
6. The electrode sheet according to claim 1, characterized in that, The electrode tab is a conductive body obtained by cutting the empty foil area and the adapter disposed in the empty foil area along the width direction of the empty foil area.
7. A battery cell, characterized in that, The battery cell includes cross-stacked positive and negative electrode plates, the positive electrode plate having a positive tab, the negative electrode plate having a negative tab, a separator being disposed between the positive and negative electrode plates, and the positive and / or negative electrode plates using the electrode plates described in any one of claims 1-6. Wherein, when the electrode is used as a positive electrode, the active material is a positive electrode active material; when the electrode is used as a negative electrode, the active material is a negative electrode active material.
8. A battery, characterized in that, The battery includes a housing, a battery cell as described in claim 7, and a top cover. The housing and the top cover encapsulate the battery cell within the housing. The positive and negative tabs of the battery cell are respectively connected to the terminals of the top cover so that the electrode plates can supply power to external electrical devices.