Electrode piece, electrode assembly, battery cell, battery pack and electric equipment

Abstract

The invention provides a pole piece, an electrode assembly, a battery cell, a battery pack and electric equipment, and relates to the technical field of batteries. The pole piece comprises a pole piece body and a pole lug, in the first direction, the pole piece body is provided with a first side edge and a second side edge which are oppositely arranged; the tabs comprise a first tab and a second tab, the first tab is arranged on the first side edge, and the second tab is arranged on the second side edge. According to the pole piece, the tabs are arranged on the two side edges, located in the first direction, of the pole piece body, the total area of the tabs of the pole piece can be increased, so that conduction paths of electrons on the tabs are increased, and the current collection area of the pole piece can be increased. Therefore, the current collecting capacity of the pole piece is improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to an electrode sheet, electrode assembly, battery cell, battery pack, and electrical equipment. Background Technology

[0002] In related technologies, a battery cell includes a casing and an electrode assembly disposed within the casing. The electrode assembly includes a positive electrode plate, a separator, and a negative electrode plate stacked and wound sequentially. To achieve simultaneous output of the positive and negative electrodes on the same side of the battery cell, the casing is typically used as the negative output electrode. Simultaneously, a mounting position for installing a terminal post is insulated and isolated on the top cover of the casing using a sealing element. A terminal post is positioned at this mounting position as the positive output electrode. In this structure where the positive and negative electrodes output on the same side, a positive tab is provided at the end of the positive electrode plate near the top cover, and a negative tab is provided at the end of the negative electrode plate near the top cover. The negative tab is electrically connected to the casing, and the positive tab is connected to the terminal post, thereby leading out the positive and negative electrodes of the battery cell respectively.

[0003] In this scheme, although the current collection capacity of the electrode basically meets the application requirements of the battery cell, there is still room for improvement in the current collection capacity of the electrode. Summary of the Invention

[0004] The embodiments of this application provide an electrode sheet, an electrode assembly, a battery cell, a battery pack, and an electrical device, which can improve the current collection capacity of the electrode sheet.

[0005] In a first aspect, embodiments of this application provide an electrode sheet, which includes an electrode sheet body and an electrode tab; in a first direction, the electrode sheet body has a first side and a second side disposed opposite to each other; the electrode tab includes a first electrode tab and a second electrode tab, the first electrode tab being disposed on the first side and the second electrode tab being disposed on the second side.

[0006] In one embodiment, in the second direction, the electrode body has an electrode head end and an electrode tail end; in the second direction, the second electrode tab is disposed further away from the electrode head end than the first electrode tab.

[0007] In one embodiment, in the second direction, the second tab has a second tab head end near the electrode head end, and the second tab head end and the electrode head end are spaced apart.

[0008] In one embodiment, along the second direction, the distance between the tip of the second electrode ear and the tip of the electrode plate is L. 12头 The length dimension of the electrode body is L 10 Satisfying: 7% L 10 ≤L 12头 ≤20% L 10 .

[0009] In one embodiment, the length dimension of the second electrode tab is L along the second direction. 12耳Satisfying: 60% L 10 ≤L 12耳 ≤80% L 10 .

[0010] In one embodiment, along the second direction, the distance between the tip of the second electrode ear and the tip of the electrode plate is L. 12头 The length dimension of the electrode body is L 10 Satisfying: 30% L 10 ≤L 12头 ≤40% L 10 .

[0011] In one embodiment, the length dimension of the second electrode tab is L along the second direction. 12耳 Satisfying: L 12耳 =35%L 10 ~60% L 10 .

[0012] In one embodiment, along a first direction, the first electrode and the second electrode are at least partially opposite to each other.

[0013] In one embodiment, along a first direction, the ends of the first electrode and the second electrode that are close to each other are disposed opposite to each other, the end of the first electrode that is far from the second electrode is disposed offset from the second electrode, and the end of the second electrode that is far from the first electrode is disposed offset from the first electrode.

[0014] In one embodiment, the electrode has a positive polarity.

[0015] In one embodiment, in the second direction, the second electrode tab has a second electrode tab tail end near the tail end of the electrode plate, and the tail end of the second electrode tab and the tail end of the electrode plate are spaced apart.

[0016] In one embodiment, along the second direction, the distance between the tail end of the second electrode tab and the tail end of the electrode plate is L. 12尾 The length dimension of the electrode body is L 10 Satisfying: 0 < L 12尾 ≤33% L 10 .

[0017] In one embodiment, in the second direction, the first electrode tab has a first electrode tab head end near the electrode tip end and a first electrode tab tail end near the electrode tail end; along the second direction, the first electrode tab tail end and the electrode tail end are spaced apart, and / or, along the second direction, the first electrode tab head end and the electrode head end are spaced apart.

[0018] In one embodiment, along the second direction, the distance between the tail end of the first electrode tab and the tail end of the electrode plate is L. 11尾 The length dimension of the electrode body is L 10 Satisfying: L 11尾 =60% L 10~78% L 10 .

[0019] In one embodiment, along the second direction, the distance between the tip of the first electrode tab and the tip of the electrode plate is L. 11头 The length dimension of the electrode body is L 10 Satisfying: L 11头 =7% L 10 ~20% L 10 .

[0020] In one embodiment, the length dimension of the first electrode tab along the second direction is L. 11耳 The length dimension of the electrode body is L 10 Satisfying: L 11耳 =15% L 10 ~20% L 10 .

[0021] In one embodiment, in the second direction, the electrode body has an electrode head end and an electrode tail end; in the second direction, the second electrode tab is disposed closer to the electrode head end than the first electrode tab.

[0022] In one embodiment, in the second direction, the second tab has a second tab head end near the electrode head end, and the second tab head end and the electrode head end are spaced apart.

[0023] In one embodiment, along the second direction, the distance between the tip of the second electrode ear and the tip of the electrode plate is L. 22头 The length dimension of the electrode body is L 20 Satisfying: L 22头 =7% L 20 ~20% L 20 .

[0024] In one embodiment, along the second direction, the second tab has a second tab tail end near the tail end of the electrode plate, and the second tab tail end and the tail end of the electrode plate are spaced apart.

[0025] In one embodiment, along the second direction, there is a distance L between the tail end of the second electrode ear and the tail end of the electrode plate. 22尾 The length dimension of the electrode body is L 20 Satisfying: L 22尾 =60L 20 ~78% L 20 .

[0026] In one embodiment, the length dimension of the second electrode tab is L along the second direction. 22耳 The length dimension of the electrode body is L 20 Satisfying: L 22耳 =15% L 20 ~20% L 20 .

[0027] In one embodiment, in the second direction, the first electrode tab has a first electrode tab head end near the electrode tip end and a first electrode tab tail end near the electrode tail end; along the second direction, the first electrode tab tail end and the electrode tail end are spaced apart, and / or, along the second direction, the first electrode tab head end and the electrode head end are spaced apart.

[0028] In one embodiment, along the second direction, the distance between the tip of the first electrode tab and the tip of the electrode plate is L. 21头 The length dimension of the electrode body is L 20 Satisfying: 40% L 20 ≤L 21头 ≤50% L 20 .

[0029] In one embodiment, along the second direction, the distance between the tail end of the first electrode tab and the tail end of the electrode plate is L. 21尾 The length dimension of the electrode body is L 20 Satisfying: 0 < L 21尾 ≤30% L 20 .

[0030] In one embodiment, the length dimension of the first electrode tab along the second direction is L. 21耳 The length dimension of the electrode body is L 20 Satisfying: 30% L 20 ≤L 21耳 ≤50% L 20 .

[0031] In one embodiment, the first electrode and the second electrode are spaced apart along the second direction.

[0032] In one embodiment, the electrode has a negative polarity.

[0033] In one embodiment, the electrode includes a coated area coated with an active material and an uncoated area uncoated with an active material, with the electrode body disposed in the coated area and the tab disposed in the uncoated area.

[0034] In one embodiment, the tab is a die-cut tab.

[0035] In one embodiment, the die-cut width of the tab is W, which satisfies 2mm≤W≤6mm.

[0036] In one embodiment, the die-cutting angle of the tab is α, which satisfies 55°≤α≤85°.

[0037] In one embodiment, the die-cut height of the tab is H, which satisfies: 5mm≤H≤7.5mm.

[0038] Secondly, embodiments of this application provide an electrode assembly including the aforementioned electrode sheet.

[0039] Thirdly, embodiments of this application provide a battery cell that includes the aforementioned electrode assembly.

[0040] Fourthly, embodiments of this application provide a battery pack, which includes a battery box and the aforementioned battery cells; the battery box has a receiving cavity; there are multiple battery cells, and the multiple battery cells are disposed in the receiving cavity.

[0041] Fifthly, embodiments of this application provide an electrical device that includes the aforementioned battery cell or battery pack, wherein the battery cell or battery pack supplies power to the electrical device.

[0042] The beneficial effects of the embodiments of this application are as follows:

[0043] In the embodiments of this application, by providing tabs on both sides of the electrode body in the first direction, the total area of ​​the tabs of the electrode can be increased, thereby increasing the conduction path of electrons on the tabs and thus increasing the current collecting area of ​​the electrode. This improves the current collecting capacity of the electrode. Attached Figure Description

[0044] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0045] Figure 1 This is a schematic diagram of the structure of the electrode provided in an embodiment of this application;

[0046] Figure 2 This is a schematic diagram of the structure of another electrode provided in an embodiment of this application;

[0047] Figure 3 This is a schematic diagram of the structure of another electrode provided in an embodiment of this application;

[0048] Figure 4 This is a cross-sectional view of an electrode sheet rolled into a core according to an embodiment of this application;

[0049] Figure 5 This is a schematic diagram of the coated area and the uncoated area provided in an embodiment of this application;

[0050] Figure 6 This is a schematic diagram of the electrode structure provided in an embodiment of this application;

[0051] Figure 7 This is a schematic diagram of the structure of the electrode assembly provided in an embodiment of this application;

[0052] Figure 8This is a schematic diagram of the battery cell structure provided in an embodiment of this application;

[0053] Figure 9 This is a schematic diagram of the battery pack structure provided in an embodiment of this application;

[0054] Figure 10 This is a schematic diagram of the structure of the electrical equipment provided in the embodiments of this application.

[0055] Explanation of reference numerals in the attached figures:

[0056] 001-Electrode;

[0057] 011-Electrode body; 111-Electrode head end; 112-Electrode tail end; 113-First side; 114-Second side;

[0058] 012 - First pole ear; 121 - First pole ear tip; 122 - First pole ear tail end;

[0059] 013 - Second pole ear; 131 - Head end of the second pole ear; 132 - Tail end of the second pole ear;

[0060] 014-Ear;

[0061] 015 - Coated area; 016 - Uncoated area;

[0062] 002 - Electrode assembly;

[0063] 003-Battery cell; 031-Casing; 032-Cover plate;

[0064] 004 - Battery pack; 041 - Battery box;

[0065] 005 - Electrical equipment; Detailed Implementation

[0066] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0067] Furthermore, it should be understood that the specific embodiments described herein are for illustrative and explanatory purposes only and are not intended to limit the scope of this application. In this application, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in its actual use or operation, specifically the directions shown in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0068] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0069] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0070] The terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0071] In the description of the embodiments of this application, the words "example" or "for example" are used to indicate exemplification, illustration, or description. Any embodiment or design described as "example" or "for example" in the embodiments of this application is not to be construed as being more preferred or having more advantages than another embodiment or design. The use of the words "example" or "for example" is intended to present relative concepts in a clear manner.

[0072] Please see Figure 1 or Figure 2 or Figure 3 , Figure 1 This is a schematic diagram of the structure of electrode 001 provided in an embodiment of this application. Figure 2 This is a schematic diagram of the structure of another electrode 001 provided in an embodiment of this application. Figure 3This is a schematic diagram of the structure of another electrode 001 provided in an embodiment of this application. An embodiment of this application provides an electrode 001. The electrode 001 includes an electrode body 011 and electrode tabs 014. In a first direction, the electrode body 011 has a first side 113 and a second side 114 disposed opposite to each other. The electrode tabs 014 include a first electrode tab 012 and a second electrode tab 013. The first electrode tab 012 is disposed on the first side 113, and the second electrode tab 013 is disposed on the second side 114.

[0073] It can be understood that the first direction is the width direction of the electrode 001, and correspondingly, the tabs 014 are disposed on both sides of the width direction of the electrode body 011.

[0074] The electrode 001 includes a current collector and an active material layer disposed on the current collector. The current collector may include an active material region and an empty foil region, the active material layer is disposed in the active material region, and the empty foil region is used to form the tab 014.

[0075] In this embodiment, by providing tabs 014 on both sides of the electrode body 011 in the first direction, the total area of ​​the tabs of the electrode 001 can be increased, thereby increasing the conduction path of electrons on the tabs 014 and thus increasing the current collection area of ​​the electrode 001. This improves the current collection capability of the electrode 001.

[0076] In addition, by increasing the conduction path of electrons on the tab 014, the internal resistance of the cell 003 can be reduced, thereby improving the current conduction efficiency of the cell 003. This allows the cell 003 to have a higher charging and discharging speed, and can reduce energy loss and temperature rise during the charging and discharging process, thus improving the efficiency and performance of the battery.

[0077] Please see Figure 1 or Figure 2 In one embodiment, in the second direction, the electrode body 011 has an electrode head end 111 and an electrode tail end 112. In the second direction, the second electrode tab 013 is disposed further away from the electrode head end 111 than the first electrode tab 012.

[0078] It can be understood that the electrode head end 111 is the end of the electrode 001 that is close to the center of the core after it is wound into a core, and the electrode tail end 112 is the end located on the outer periphery of the core.

[0079] Typically, the first tab 012 of the positive electrode is located on the first side 113 near the electrode head 111, and the second tab 013 is located on the second side 114 near the electrode tail 112. Therefore, in this embodiment, the electrode 001 in which "the second tab 013 is located further away from the electrode head 111 than the first tab 012" is usually a positive electrode 001.

[0080] Furthermore, the first tab 012 is disposed on the first side 113 near the electrode head 111, and the second tab 013 is disposed on the second side 114 away from the electrode head 111. Along the width direction of the electrode body 011, the end of the first tab 012 away from the electrode head 111 and the end of the second tab 013 near the electrode head 111 can be disposed opposite to each other, or the first tab 012 and the second tab 013 can be completely offset.

[0081] In this embodiment, the above-mentioned arrangement allows the first tab 012 to collect current mainly in the area near the head end 111 of the electrode plate, and the second tab 013 to collect current mainly in the area near the tail end 112 of the electrode plate. This allows the first tab 012 and the second tab 013 to collect current along the entire length of the electrode plate 001, thereby shortening the current collection path of the electrode plate 001 and reducing the internal resistance of the cell 003.

[0082] Please see Figure 1 or Figure 2 In one embodiment, in the second direction, the second electrode tab 013 has a second electrode tab head end 131 near the electrode head end 111. The second electrode tab head end 131 and the electrode head end 111 are spaced apart.

[0083] It is understandable that after electrode 001 is wound into a core, tab 014 is parallel to the axis of the core, occupying a relatively large height dimension, which adversely affects the energy density of cell 003. Therefore, tab 014, which is usually near the center of the core, is bent towards the center to reduce the space occupied by tab 014. However, directly bending tab 014 not only results in a high stacking height after bending, but also leads to poor flatness of the stacked tabs, which is detrimental to the welding of tab 014 to the current collector.

[0084] Based on this, in this embodiment, by spacing the second electrode tab head 131 and the electrode sheet head 111, a groove can be formed on the end face of the core formed by the electrode sheet 001 near the central hole, so that the bent second electrode tab 013 can be poured into the groove. This not only reduces the stacking height of the bent second electrode tab 013, but also improves the flatness of the stacked second electrode tab 013, thereby enhancing the ease of welding the second electrode tab 013 to the current collector.

[0085] In addition, the above settings can prevent the second tab 013 near the electrode head 111 from blocking the center hole of the core after bending, thereby improving the smoothness of electrolyte flow into the center hole and ensuring the wetting efficiency of the core.

[0086] Please see Figure 1 In one embodiment, along the second direction, the distance between the second electrode tip 131 and the electrode tip 111 is L.12头 The length dimension of the electrode body 011 is L. 10 Satisfying: 7% L 10 ≤L 12头 ≤20%L 10 .

[0087] Understandable, L 12头 Including but not limited to 7% L 10 8.6% L 10 9.1% L 10 10% L 10 13.6% L 10 15.6% L 10 18.7% L 10 19% L 10 20% L 10 .

[0088] For example:

[0089] L 10 When it is 4800mm, L 12头 The diameter can range from 336mm to 960mm, for example, 336mm, 400mm, 500mm, 600mm, 753mm, 800mm, 880mm, 900mm, and 960mm.

[0090] L 10 When L is 5000mm, 12头 The diameter can range from 350mm to 1000mm, for example, 350mm, 400mm, 500mm, 600mm, 753mm, 800mm, 880mm, 960mm, and 1000mm.

[0091] L 10 When it is 6000mm, L 12头 It can be 420mm to 1200mm, for example, 420mm, 463mm, 500mm, 600mm, 753mm, 800mm, 880mm, 960mm, 1200mm;

[0092] L 10 When L is 6200mm, 12头 The diameter can range from 434mm to 1240mm, for example, 434mm, 480mm, 500mm, 600mm, 753mm, 880mm, 980mm, 1060mm, and 1240mm.

[0093] In this embodiment, the above-mentioned limitations can, on the one hand, avoid the spacing L 12头If the size is too small, the second tab 013 will stack too high at the center of the core after bending. Therefore, the stacking height of the second tab 013 after bending can be controlled, and the flatness of the stacking of the second tab 013 can be improved. On the other hand, it can avoid the spacing L 12头 Excessive length affects the length of the second tab 013, thus ensuring the current collection area of ​​the second tab 013, and consequently ensuring the current collection capacity of the electrode 001.

[0094] Please see Figure 1 In one embodiment, the length dimension of the second electrode 013 along the second direction is L. 12耳 Satisfying: 60% L 10 ≤L 12耳 ≤80% L 10 .

[0095] It is understood that the electrode assembly includes two electrodes 001 with opposite polarities: a positive electrode and a negative electrode. When the electrode 001 of this embodiment is wound together with another electrode 001 that has a tab 014 on only the first side 113 and no tab 014 on the second side 114 to form an electrode assembly, the second tab 013 of the electrode 001 of this embodiment can be set to be longer.

[0096] Among them, L 12耳 Including but not limited to 60% L 10 63% L 10 65.2% L 10 68% L 10 70% L 10 72% L 10 76.4% L 10 79% L 10 80% L 10 .

[0097] For example:

[0098] L 10 When it is 4800mm, L 12耳 The diameter can be 2880mm to 3840mm, for example, 2880mm, 3000mm, 3212mm, 3340mm, 3553mm, 3680mm, 3780mm, 3802mm, 3840mm;

[0099] L 10 When L is 5000mm, 12耳 It can be 3000mm to 4000mm, for example, 3000mm, 3400mm, 3500mm, 3600mm, 3753mm, 3800mm, 3880mm, 3960mm, 4000mm;

[0100] L10 When it is 6000mm, L 12耳 It can be 3600mm to 4800mm, for example, 3600mm, 3700mm, 3800mm, 3960mm, 4000mm, 4180mm, 4368mm, 4760mm, 4800mm;

[0101] L 10 When L is 6200mm, 12耳 The diameter can range from 3720mm to 4960mm, for example, 3720mm, 4000mm, 4200mm, 4350mm, 4653mm, 4780mm, 4880mm, 4900mm, and 4960mm.

[0102] In this embodiment, the above-mentioned limitations can, on the one hand, prevent the length of the second electrode tab 013 from being too large, which would result in a small gap between the head end 131 of the second electrode tab and the head end 111 of the electrode plate, thereby facilitating the control of the stacking height and stacking flatness of the second electrode tab 013 after bending; on the other hand, can prevent the length of the second electrode tab 013 from being too small, which would affect the area of ​​the second electrode tab 013.

[0103] Please see Figure 2 In one embodiment, along the second direction, the distance between the second electrode tip 131 and the electrode tip 111 is L. 12头 The length dimension of the electrode body 011 is L. 10 Satisfying: 30% L 10 ≤L 12头 ≤40%L 10 .

[0104] Among them, L 12头 Including but not limited to 30% L 10 33% L 10 35.2% L 10 36% L 10 37.1% L 10 38.2% L 10 39.6% L 10 39.9% L 10 40% L 10 .

[0105] For example:

[0106] L 10 When it is 4800mm, L 12头 The diameter can be 1440mm to 1920mm, for example, 1440mm, 1490mm, 1500mm, 1600mm, 1753mm, 1800mm, 1880mm, 1900mm, 1920mm;

[0107] L 10 When L is 5000mm, 12头 It can be 1500mm to 2000mm, for example, 1500mm, 1540mm, 1650mm, 1660mm, 1775mm, 1800mm, 1880mm, 1960mm, 2000mm;

[0108] L 10 When it is 6000mm, L 12头 It can be 1800mm to 2400mm, for example, 1800mm, 1830mm, 1950mm, 2060mm, 2175mm, 2280mm, 2288mm, 2396mm, 2400mm;

[0109] L 10 When L is 6200mm, 12头 The diameter can be 1860mm to 2480mm, for example, 1860mm, 1948mm, 2050mm, 2160mm, 22753mm, 2388mm, 2400mm, 2460mm, 2480mm.

[0110] It is understood that the electrode assembly includes two electrodes 001 with opposite polarities. When the electrode 001 of this embodiment is wound together with another electrode 001, which has tabs 014 on both the first side 113 and the second side 114, to form an electrode assembly, in order to ensure that the second tab 013 of the other electrode 001 has a sufficient current collection area, it is necessary to control the distance between the head end 131 of the second tab and the head end 111 of the electrode in this embodiment, so as to avoid the distance being too small and affecting the arrangement of the second tab 013 of the other electrode 001.

[0111] Based on this, in this embodiment, by limiting as described above, on the one hand, it can be avoided that the distance between the second tab head 131 and the electrode head 111 is too large, resulting in the length of the second tab 013 being too small, thereby ensuring that the length of the second tab 013 meets the current collection requirements of the electrode 001 and can help reduce the internal resistance of the cell; on the other hand, it can be avoided that the distance between the second tab head 131 and the electrode head 111 is too small, thus affecting the current collection area of ​​the second tab 013 of the other electrode 001 that cooperates with it.

[0112] Please see Figure 2 In one embodiment, the length dimension of the second electrode 013 along the second direction is L. 12耳 Satisfying: L 12耳 =35% L 10 ~60% L 10 .

[0113] Among them, L12耳 Including but not limited to 35% L 10 38% L 10 40.2% L 10 45% L 10 48% L 10 50% L 10 53.4% ​​L 10 58% L 10 60% L 10 .

[0114] For example:

[0115] L 10 When it is 4800mm, L 12耳 The diameter can be 1680mm to 2880mm, for example, 1680mm, 1800mm, 2000mm, 2340mm, 2553mm, 2680mm, 2780mm, 2802mm, 2880mm;

[0116] L 10 When L is 5000mm, 12耳 The diameter can range from 1750mm to 3000mm, for example, 1750mm, 1840mm, 1950mm, 2200mm, 2375mm, 2580mm, 2780mm, 2860mm, and 3000mm.

[0117] L 10 When it is 6000mm, L 12耳 The diameter can be 2100mm to 3600mm, for example, 2100mm, 2300mm, 2500mm, 2860mm, 3000mm, 3180mm, 3368mm, 3560mm, 3600mm;

[0118] L 10 When L is 6200mm, 12耳 The diameter can be 2170mm to 3720mm, for example, 2170mm, 2300mm, 2500mm, 2650mm, 2893mm, 3000mm, 3300mm, 3500mm, 3720mm.

[0119] In this embodiment, the above limitations can, on the one hand, prevent the length of the second tab 013 from being too long and affecting the current collection area of ​​the second tab 013 of the other electrode 001 that it cooperates with; on the other hand, can prevent the length of the second tab 013 from being too small, thereby meeting the current collection requirements of the electrode 001 and helping to reduce the internal resistance of the battery cell.

[0120] Please see Figure 1 or Figure 2 In one embodiment, along a first direction, the first electrode 012 and the second electrode 013 are at least partially opposite to each other. The area where the first electrode 012 and the second electrode 013 are oppositely positioned can be found in [reference needed]. Figure 1 Or the relative area of ​​electrode 014 marked in 2.

[0121] Among them, the first electrode 012 and the second electrode 013 can be set completely opposite to each other, such as Figure 1 As shown; the first electrode 012 and the second electrode 013 are partially arranged opposite each other, as shown. Figure 2 As shown. When partially relative, specifically, along the first direction, the ends of the first electrode 012 and the second electrode 013 that are close to each other are positioned opposite each other, the end of the first electrode 012 that is away from the second electrode 013 is offset from the second electrode 013, and the end of the second electrode 013 that is away from the first electrode 012 is offset from the first electrode 012.

[0122] exist Figure 2 In the electrode 001 shown, the first side 113 and the second side 114 of the other electrode 001 that cooperates with the electrode 001 are provided with electrode tabs, and the electrode assembly formed by their winding is as follows: Figure 4 As shown, Figure 4 This is a cross-sectional view of the electrode assembly provided in an embodiment of this application. Figure 4 In the process, the current collection path of the second electrode 013 is as follows: the second electrode 013 first collects current along the radial direction of the electrode assembly to the opposite region of the electrode, forming the second current collection path I; through the opposite region of the electrode, the second electrode 013 collects current along the axial direction of the electrode assembly to the first electrode 012, forming the second current collection path II.

[0123] It is understandable that when the first electrode 012 and the second electrode 013 are completely offset along the first direction, after the second electrode 013 collects current, in addition to collecting current along the second current collection path I and the second current collection path II, it also needs to transfer the current to the first electrode 012 along the winding direction of the electrode 001. Therefore, by partially aligning the first electrode 012 and the second electrode 013 along the first direction, after the second electrode 013 collects current, the current can be transferred to the first electrode 012 only along the axial direction of the electrode assembly. This shortens the current collection path of the second electrode 013 and thus improves the current collection capacity of the electrode 001.

[0124] Furthermore, when the insulating spacing between the tabs 014 in the positive and negative electrode plates prevents only one of them from having a corresponding area for the tabs 014, optionally, the corresponding area for the tabs 014 can be provided on the electrode plate 001 closer to the center hole of the electrode assembly. The specific reasons are as follows:

[0125] First, the electrode plate 001, which is closer to the center hole of the electrode assembly than the first tab 012, is usually the positive electrode plate. The positive tab is made of aluminum foil, while the negative tab is made of copper foil; therefore, the resistivity of the positive tab is greater than that of the negative tab, and its current collection capacity is weaker than that of the negative electrode plate. By setting the tab 014 in a corresponding area on the positive electrode plate, the total area of ​​the positive tab can be increased, thereby improving the current collection capacity of the positive electrode plate.

[0126] Secondly, in fast battery charging, after the positive terminal receives power, it needs to be quickly transferred to the electrode material of the positive electrode sheet. After setting the tabs 014 on the positive electrode sheet, the first tab 012 can transfer the current to the second tab 013 along the width direction of the electrode sheet 001, thereby reducing the current transfer path, improving charging efficiency, and meeting the fast charging requirements of the battery cell.

[0127] Please see Figure 1 or Figure 2 In one embodiment, in the second direction, the second electrode tab 013 has a second electrode tab tail end 132 near the electrode tail end 112, and the second electrode tab tail end 132 and the electrode tail end 112 are spaced apart.

[0128] In this way, after the electrode sheet 001 is wound into an electrode assembly, the outer periphery of the second electrode tab 013 and the outer periphery of the electrode assembly are arranged radially apart along the electrode assembly, so that the bent second electrode tab 013 is located in the interval and does not exceed the outer periphery of the electrode assembly, thereby improving the contact between the electrode tab 014 and the battery cell housing when the electrode assembly is installed in the housing, and improving the convenience of installing the electrode assembly in the housing.

[0129] In one embodiment, along the second direction, the distance between the tail end 132 of the second electrode tab and the tail end 112 of the electrode plate is L. 12尾 The length dimension of the electrode body 011 is L. 10 In combination with the aforementioned L 12耳 Minimum value: 60% L 10 Maximum value: 80% L 10 , and L 12头 Minimum value: 7% L 10 Maximum value: 20% L 10 Therefore, we know that 0 < L 12尾 ≤33% L 10 .

[0130] Understandable, L 12尾 Including but not limited to 1.7% L 10 4.6% L 10 9.1% L 10 14% L 10 19.6% L 10 22.6% L 10 28.7% L 1032% L 10 33% L 10 .

[0131] For example:

[0132] L 10 When it is 4800mm, L 12尾 The diameter can range from 240mm to 1584mm, for example, 240mm, 400mm, 800mm, 900mm, 1053mm, 1200mm, 1480mm, 1500mm, and 1584mm.

[0133] L 10 When L is 5000mm, 12尾 The diameter can range from 250mm to 1650mm, for example, 250mm, 400mm, 700mm, 900mm, 1150mm, 1300mm, 1580mm, 1600mm, and 1650mm.

[0134] L 10 When it is 6000mm, L 12尾 The diameter can range from 300mm to 1980mm, for example, 300mm, 600mm, 800mm, 1000mm, 1100mm, 1400mm, 1553mm, 1800mm, and 1980mm.

[0135] L 10 When L is 6200mm, 12尾 The diameter can range from 310mm to 2046mm, for example, 310mm, 480mm, 800mm, 1000mm, 1553mm, 1680mm, 1980mm, 2000mm, and 2046mm.

[0136] In this embodiment, through the above-mentioned arrangement, on the one hand, after the electrode sheet 001 is wound into an electrode assembly, the outer periphery of the second tab 013 and the outer periphery of the electrode assembly are arranged radially apart along the electrode assembly, so that the bent tab 014 is located in the interval and does not exceed the outer periphery of the electrode assembly; on the other hand, it can avoid the gap between the outer periphery of the second tab 013 and the outer periphery of the electrode assembly being too large, which would affect the area of ​​the second tab 013, so that the current collection capacity and internal resistance of the second tab 013 meet the requirements.

[0137] Please see Figure 1 or Figure 2In one embodiment, in the second direction, the first tab 012 has a first tab head end 121 near the electrode head end 111 and a first tab tail end 122 near the electrode tail end 112. Along the second direction, the first tab tail end 122 and the electrode tail end 112 are spaced apart, and / or, along the second direction, the first tab head end 121 and the electrode head end 111 are spaced apart.

[0138] Specifically, along the second direction, the tail end 122 of the first electrode tab and the tail end 112 of the electrode sheet are spaced apart; or, along the second direction, the head end 121 of the first electrode tab and the head end 111 of the electrode sheet are spaced apart; or, along the second direction, the tail end 122 of the first electrode tab and the tail end 112 of the electrode sheet are spaced apart, and the head end 121 of the first electrode tab and the head end 111 of the electrode sheet are spaced apart.

[0139] When the tail end 122 of the first electrode tab and the tail end 112 of the electrode sheet are spaced apart, after the electrode sheet 001 is wound into an electrode assembly, the outer periphery of the first electrode tab 012 and the outer periphery of the electrode assembly are spaced apart along the radial direction of the electrode assembly, which facilitates the arrangement of the first electrode tab 012 of the other electrode sheet 001.

[0140] Furthermore, when the first tab head 121 and the electrode head 111 are spaced apart, a groove can be formed on the side of the end face of the electrode assembly rolled from the electrode 001 near the central hole, so that the bent first tab 012 can be poured into the groove. This not only reduces the stacking height of the first tab 012 after bending, but also improves the flatness of the stacked first tabs 012, thereby improving the ease of welding the first tab 012 to the current collector.

[0141] Furthermore, when the first tab end 121 and the electrode end 111 are spaced apart, the first tab 012 near the electrode end 111 can bend and block the central hole of the electrode assembly, thereby improving the smoothness of electrolyte flow into the central hole and ensuring the wetting efficiency of the electrode assembly.

[0142] Please see Figure 1 or Figure 2 In one embodiment, along the second direction, the distance between the tail end 122 of the first electrode tab and the tail end 112 of the electrode plate is L. 11尾 The length dimension of the electrode body 011 is L. 10 Satisfying: L 11尾 =60%L 10 ~78% L 10 .

[0143] It is understood that the electrode assembly includes two electrodes 001 with opposite polarities, serving as a positive electrode and a negative electrode, respectively. In this embodiment, the first tab 012 is disposed adjacent to the head end 111 of the electrode, while the first tab 012 of the other electrode 001, which is wound together with the electrode 001 of this embodiment to form the electrode assembly, is disposed away from the head end 111 of the electrode. Therefore, in order to avoid interference between the first tab 012 of the electrode 001 and the tab 014 of the other electrode 001, the distance between the tail end 122 of the first tab and the tail end 112 of the electrode needs to be set to be relatively large to facilitate the placement of the tab 014 of the other electrode 001.

[0144] Among them, L 11尾 Including but not limited to 60% L 10 63% L 10 65.2% L 10 68% L 10 69% L 10 70% L 10 73.4% L 10 76% L 10 78% L 10 .

[0145] For example:

[0146] L 10 When it is 4800mm, L 11尾 The diameter can be 2880mm to 3744mm, for example, 2880mm, 2940mm, 3080mm, 3200mm, 3453mm, 3520mm, 3680mm, 3700mm, 3744mm;

[0147] L 10 When L is 5000mm, 11尾 It can be 3000mm to 3900mm, for example, 3000mm, 3300mm, 3400mm, 3500mm, 3650mm, 3700mm, 3808mm, 3880mm, 3900mm;

[0148] L 10 When it is 6000mm, L 11尾 The diameter can be 3600mm to 4680mm, for example, 3600mm, 3700mm, 3800mm, 4100mm, 4253mm, 4400mm, 4580mm, 4600mm, 4680mm;

[0149] L 10 When L is 6200mm, 11尾The diameter can range from 3720mm to 4836mm, for example, 3720mm, 380mm, 4000mm, 4100mm, 4353mm, 4580mm, 4780mm, 4800mm, and 4836mm.

[0150] In this embodiment, the above-mentioned limitations can, on the one hand, prevent the gap between the tail end 122 of the first electrode tab and the tail end 112 of the electrode from being too large, thereby ensuring that the area of ​​the first electrode tab 012 in this embodiment meets the current collection requirements and has a suitable internal resistance; on the other hand, it can also prevent the gap between the tail end 122 of the first electrode tab and the tail end 112 of the electrode from being too small, which would affect the arrangement of the first electrode tab 012 of the other electrode 001.

[0151] In one embodiment, along the second direction, the distance between the first electrode tip 121 and the electrode tip 111 is L. 11头 The length dimension of the electrode body 011 is L. 10 Satisfying: L 11头 =7% L 10 ~20% L 10 .

[0152] Among them, L 11头 Including but not limited to 7% L 10 8.6% L 10 9.1% L 10 10% L 10 13.6% L 10 15.6% L 10 18.7% L 10 19% L 10 20% L 10 .

[0153] For example:

[0154] L 10 When it is 4800mm, L 11头 The diameter can range from 336mm to 960mm, for example, 336mm, 400mm, 500mm, 600mm, 753mm, 800mm, 880mm, 900mm, and 960mm.

[0155] L 10 When L is 5000mm, 11头 The diameter can range from 350mm to 1000mm, for example, 350mm, 400mm, 500mm, 600mm, 753mm, 800mm, 880mm, 960mm, and 1000mm.

[0156] L 10 When it is 6000mm, L 11头It can be 420mm to 1200mm, for example, 420mm, 463mm, 500mm, 600mm, 753mm, 800mm, 880mm, 960mm, 1200mm;

[0157] L 10 When L is 6200mm, 11头 The diameter can range from 434mm to 1240mm, for example, 434mm, 480mm, 500mm, 600mm, 753mm, 880mm, 980mm, 1060mm, and 1240mm.

[0158] In this embodiment, the above-mentioned limitations can, on the one hand, avoid the spacing L 11头 If the height is too small, the first tab 012 will stack too high at the center of the electrode assembly after bending. Therefore, the stacking height of the tab 014 after bending can be controlled, and the flatness of the tab 014 stacking can be improved. On the other hand, it can avoid the spacing L 11头 Excessive length affects the length of the first tab 012, thus ensuring the current collection area of ​​the first tab 012, and consequently ensuring the current collection capacity of the electrode 001.

[0159] In one embodiment, the length dimension of the first tab 012 along the second direction is L. 11耳 The length dimension of the electrode body 011 is L. 10 Satisfying: L 11耳 =15% L 10 ~20% L 10 .

[0160] Among them, L 11耳 Including but not limited to 15% L 10 16% L 10 16.2% L 10 17% L 10 18% L 10 18.2% L 10 19.4% L 10 19.5% L 10 20% L 10 .

[0161] For example:

[0162] L 10 When it is 4800mm, L 11耳 The diameter can range from 720mm to 960mm, for example, 720mm, 760mm, 812mm, 8340mm, 8553mm, 8680mm, 908mm, 950mm, and 960mm.

[0163] L 10When L is 5000mm, 11耳 The diameter can range from 750mm to 1000mm, for example, 750mm, 800mm, 850mm, 900mm, 905mm, 968mm, 980mm, 990mm, and 1000mm.

[0164] L 10 When it is 6000mm, L 11耳 It can be 900mm to 1200mm, for example, 900mm, 930mm, 990mm, 1000mm, 1050mm, 1080mm, 1100mm, 1160mm, 1200mm;

[0165] L 10 When L is 6200mm, 11耳 The diameter can be 930mm to 1240mm, for example, 930mm, 1000mm, 1010mm, 1050mm, 1100mm, 1180mm, 1200mm, 1210mm, 1240mm.

[0166] In this embodiment, the above limitations can, on the one hand, prevent the length of the first tab 012 from being too long and affecting the current collection area of ​​the first tab 012 of the other electrode 001 that it cooperates with; on the other hand, can prevent the length of the first tab 012 from being too small, thereby meeting the current collection requirements of the electrode 001 and reducing the internal resistance of the battery cell.

[0167] Please see Figure 3 In one embodiment, in the second direction, the electrode body 011 has an electrode head end 111 and an electrode tail end 112; in the second direction, the second electrode tab 013 is disposed closer to the electrode head end 111 than the first electrode tab 012.

[0168] It can be understood that the electrode head end 111 is the end of the electrode assembly that is close to the center of the electrode assembly after the electrode 001 is wound into an electrode assembly, and the electrode tail end 112 is the end located on the outer periphery of the electrode assembly.

[0169] Typically, the first tab 012 of the negative electrode is located on the first side 113 away from the electrode head 111, and the second tab 013 is located on the second side 114 close to the electrode head 111. Therefore, in this embodiment, the electrode 001 in which "the second tab 013 is located closer to the electrode head 111 than the first tab 012" is usually a negative electrode 001.

[0170] Furthermore, the first tab 012 is disposed on the first side 113 away from the electrode head 111, and the second tab 013 is disposed on the second side 114 near the electrode head 111. Along the width direction of the electrode body 011, the end of the first tab 012 away from the electrode head 111 and the end of the second tab 013 near the electrode head 111 can be disposed opposite to each other, or the first tab 012 and the second tab 013 can be completely offset.

[0171] In this embodiment, through the above-mentioned arrangement, the first tab 012 can mainly collect current in the area near the tail end 112 of the electrode, and the second tab 013 can mainly collect current in the area near the head end 111 of the electrode. This allows the first tab 012 and the second tab 013 to take into account the current collection along the entire length of the electrode 001, thereby shortening the current collection path of the electrode 001 and reducing the internal resistance of the cell.

[0172] Please see Figure 3 In one embodiment, in the second direction, the second electrode tab 013 has a second electrode tab head end 131 near the electrode head end 111, and the second electrode tab head end 131 and the electrode head end 111 are spaced apart.

[0173] It is understandable that after electrode 001 is wound into an electrode assembly, tab 014 is parallel to the axial direction of the electrode assembly, occupying a relatively large height dimension, which adversely affects the energy density of the cell. Therefore, tab 014, which is usually close to the center of the electrode assembly, is bent towards the center to reduce the space occupied by tab 014. However, directly bending tab 014 not only results in a high stacking height after bending, but also leads to poor flatness of the stacked tabs 014, which is detrimental to the welding of tab 014 to the current collector.

[0174] Based on this, in this embodiment, by spacing the second tab head 131 and the electrode head 111, a groove can be formed on the side of the end face of the electrode assembly rolled from the electrode 001 near the central hole, so that the bent second tab 013 can be poured into the groove. This not only reduces the stacking height of the bent second tab 013, but also improves the flatness of the stacked second tabs 013, thereby enhancing the ease of welding the second tab 013 to the current collector.

[0175] In addition, the above-mentioned arrangement can prevent the second tab 013 near the electrode head 111 from being bent and blocking the central hole of the electrode assembly, thereby improving the smoothness of electrolyte flow into the central hole and ensuring the wetting efficiency of the electrode assembly.

[0176] Please see Figure 3 In one embodiment, along the second direction, the distance between the second electrode tip 131 and the electrode tip 111 is L. 22头The length dimension of the electrode body 011 is L. 20 Satisfying: L 22头 =7% L 20 ~20%L 20 .

[0177] Understandable, L 22头 Including but not limited to 7% L 20 8.6% L 20 9.1% L 20 10% L 20 13.6% L 20 15.6% L 20 18.7% L 20 19% L 20 20% L 20 .

[0178] For example:

[0179] L 20 When L is 5000mm, 22头 The diameter can range from 350mm to 1000mm, for example, 350mm, 400mm, 500mm, 600mm, 753mm, 800mm, 880mm, 960mm, and 1000mm.

[0180] L 20 When L is 5200mm, 22头 The diameter can range from 364mm to 1040mm, for example, 364mm, 400mm, 500mm, 600mm, 753mm, 800mm, 880mm, 960mm, and 1040mm.

[0181] L 20 When L is 6200mm, 22头 The diameter can range from 434mm to 1240mm, for example, 434mm, 480mm, 500mm, 600mm, 753mm, 880mm, 980mm, 1060mm, and 1240mm.

[0182] L 20 When L is 6400mm, 22头 The diameter can range from 448mm to 1280mm, for example, 448mm, 480mm, 500mm, 600mm, 753mm, 880mm, 980mm, 1060mm, and 1280mm.

[0183] In this embodiment, the above-mentioned limitations can, on the one hand, avoid the spacing L 22头If the height is too small, the second tab 013 will stack too high at the center of the electrode assembly after bending. Therefore, the stacking height of the tab 014 after bending can be controlled, and the flatness of the tab 014 stacking can be improved. On the other hand, it can avoid the spacing L 22头 Excessive length affects the length of the second tab 013, thus ensuring the current collection area of ​​the second tab 013, and consequently ensuring the current collection capacity of the electrode 001.

[0184] Please see Figure 3 In one embodiment, along the second direction, the second tab 013 has a second tab tail end 132 near the tail end 112 of the electrode plate, and the second tab tail end 132 and the tail end 112 of the electrode plate are spaced apart.

[0185] In this embodiment, by setting the tail end 132 of the second tab and the tail end 112 of the electrode sheet at intervals, after the electrode sheet 001 is wound into an electrode assembly, the outer periphery of the second tab 013 and the outer periphery of the electrode assembly are set at radial intervals along the electrode assembly. This allows the bent second tab 013 to be located in the interval without exceeding the outer periphery of the electrode assembly, thereby improving the contact between the tab 014 and the battery cell housing when the electrode assembly is installed in the housing, and improving the convenience of installing the electrode assembly in the housing.

[0186] Please see Figure 3 In one embodiment, along the second direction, there is a distance L between the tail end 132 of the second electrode ear and the tail end 112 of the electrode plate. 22尾 The length dimension of the electrode body 011 is L. 20 Satisfying: L 22尾 =60L 20 ~78%L 20 .

[0187] It is understood that the electrode assembly includes two electrodes 001 with opposite polarities, serving as a positive electrode and a negative electrode, respectively. In this embodiment, the second tab 013 is disposed adjacent to the head end 111 of the electrode, while the second tab 013 of the other electrode 001, which is wound together with the electrode 001 of this embodiment to form the electrode assembly, is disposed away from the head end 111 of the electrode. Therefore, in order to avoid interference between the second tab 013 of the electrode 001 and the tab 014 of the other electrode 001, the distance between the tail end 132 of the second tab and the tail end 112 of the electrode needs to be set to be relatively large to facilitate the placement of the tab 014 of the other electrode 001.

[0188] Among them, L 22尾 Including but not limited to 60% L 20 63% L 20 65.2% L 20 68% L 20 69% L 20 70% L 20 73.4% L20 76% L 20 78% L 20 .

[0189] For example:

[0190] L 20 When L is 5000mm, 22尾 It can be 3000mm to 3900mm, for example, 3000mm, 3300mm, 3400mm, 3500mm, 3650mm, 3700mm, 3808mm, 3880mm, 3900mm;

[0191] L 20 When L is 5200mm, 22尾 The diameter can range from 3120mm to 4056mm, for example, 3000mm, 3300mm, 3400mm, 3500mm, 3650mm, 3700mm, 3808mm, 3880mm, and 4056mm.

[0192] L 20 When L is 6200mm, 22尾 The diameter can be from 3720mm to 4836mm, for example, 3720mm, 380mm, 4000mm, 4200mm, 4353mm, 4580mm, 4780mm, 4800mm, 4836mm;

[0193] L 20 When L is 6400mm, 22尾 The diameter can range from 3840mm to 4992mm, for example, 3720mm, 380mm, 4000mm, 4200mm, 4353mm, 4580mm, 4780mm, 4800mm, and 4992mm.

[0194] In this embodiment, the above-mentioned limitations can, on the one hand, prevent the gap between the tail end 132 of the second electrode tab and the tail end 112 of the electrode from being too large, thereby ensuring that the area of ​​the second electrode tab 013 in this embodiment meets the current collection requirements and reduces the internal resistance; on the other hand, it can also prevent the gap between the tail end 132 of the second electrode tab and the tail end 112 of the electrode from being too small, which would affect the arrangement of the second electrode tab 013 of the other electrode 001.

[0195] Please see Figure 3 In one embodiment, the length dimension of the second electrode 013 along the second direction is L. 22耳 The length dimension of the electrode body 011 is L. 20 Satisfying: L 22耳 =15% L 20 ~20% L 20 .

[0196] Among them, L 22耳 Including but not limited to 15% L 20 16% L 20 16.2% L 20 17% L 20 18% L 20 18.2% L 20 19.4% L 20 19.5% L 20 20% L 20 .

[0197] For example:

[0198] L 20 When L is 5000mm, 22耳 The diameter can range from 750mm to 1000mm, for example, 750mm, 800mm, 850mm, 900mm, 905mm, 968mm, 980mm, 990mm, and 1000mm.

[0199] L 20 When L is 5200mm, 22耳 The diameter can range from 780mm to 1040mm, for example, 780mm, 800mm, 850mm, 900mm, 905mm, 968mm, 980mm, 990mm, and 1040mm.

[0200] L 20 When L is 6200mm, 22耳 The diameter can range from 930mm to 1240mm, for example, 930mm, 1000mm, 1020mm, 1050mm, 1100mm, 1180mm, 1200mm, 1220mm, and 1240mm.

[0201] L 20 When L is 6400mm, 22耳 The diameter can range from 960mm to 1280mm, for example, 960mm, 1000mm, 1020mm, 1050mm, 1100mm, 1180mm, 1200mm, 1220mm, and 1280mm.

[0202] In this embodiment, the above limitations can, on the one hand, prevent the length of the second tab 013 from being too long and affecting the current collection area of ​​the second tab 013 of the other electrode 001 that it cooperates with; on the other hand, can prevent the length of the second tab 013 from being too small, thereby meeting the current collection requirements of the electrode 001 and reducing the internal resistance of the cell.

[0203] Please see Figure 3 In one embodiment, in the second direction, the first tab 012 has a first tab head end 121 near the electrode head end 111 and a first tab tail end 122 near the electrode tail end 112; along the second direction, the first tab tail end 122 and the electrode tail end 112 are spaced apart, and / or, along the second direction, the first tab head end 121 and the electrode head end 111 are spaced apart.

[0204] Specifically, along the second direction, the tail end 122 of the first electrode tab and the tail end 112 of the electrode sheet are spaced apart; or, along the second direction, the head end 121 of the first electrode tab and the head end 111 of the electrode sheet are spaced apart; or, along the second direction, the tail end 122 of the first electrode tab and the tail end 112 of the electrode sheet are spaced apart, and the head end 121 of the first electrode tab and the head end 111 of the electrode sheet are spaced apart.

[0205] When the tail end 122 of the first electrode tab and the tail end 112 of the electrode sheet are spaced apart, after the electrode sheet 001 is wound into an electrode assembly, the outer periphery of the first electrode tab 012 and the outer periphery of the electrode assembly are radially spaced apart. This ensures that the bent first electrode tab 012 is located within the interval and does not exceed the outer periphery of the electrode assembly, thereby improving the contact between the electrode tab 014 and the battery cell housing when the electrode assembly is installed, thus enhancing the ease of installation. Simultaneously, it also reduces the stacking height of the bent first electrode tab 012 and improves the flatness of the stacked first electrode tab 012, thereby enhancing the ease of welding the first electrode tab 012 to the current collector.

[0206] In addition, when the first tab head 121 and the electrode head 111 are spaced apart, after the electrode 001 is wound into an electrode assembly, the outer periphery of the first tab 012 and the outer periphery of the electrode assembly are spaced apart along the radial direction of the electrode assembly, which facilitates the arrangement of the first tab 012 of the other electrode 001.

[0207] Please see Figure 3 In one embodiment, along the second direction, the distance between the first electrode tip 121 and the electrode tip 111 is L. 21头 The length dimension of the electrode body 011 is L. 20 Satisfying: 40% L 20 ≤L 21头 ≤50%L 20 .

[0208] Among them, L 21头 Including but not limited to 40% L 20 43% L 20 44.2% L 20 45% L 20 46.1% L 20 47.2% L 20 48.6% L20 49.9% L 20 50% L 20 .

[0209] For example:

[0210] L 20 When L is 5000mm, 21头 It can be 2000mm to 2500mm, for example, 2000mm, 2040mm, 2100mm, 2160mm, 2230mm, 2300mm, 2416mm, 2489mm, 2500mm;

[0211] L 20 When L is 5200mm, 21头 The diameter can be 2080mm to 2600mm, for example, 2080mm, 100mm, 2160mm, 2230mm, 2300mm, 2416mm, 2489mm, 2538mm, 2600mm;

[0212] L 20 When L is 6200mm, 21头 The diameter can be 2480mm to 3100mm, for example, 2480mm, 2489mm, 2538mm, 2600mm, 2775mm, 2880mm, 2988mm, 2096mm, 3100mm;

[0213] L 20 When L is 6400mm, 21头 The diameter can be 2560mm to 3200mm, for example, 2560mm, 2600mm, 2775mm, 2880mm, 2988mm, 2096mm, 3100mm, 3160mm, 3200mm.

[0214] It is understood that the electrode assembly includes two electrodes 001 with opposite polarities. When the electrodes 001 of this embodiment are wound together with another electrode 001 to form an electrode assembly, in order to ensure that the first tab 012 of the other electrode 001 has a sufficient current collection area, it is necessary to control the distance between the first tab end 121 and the electrode end 111 of this embodiment, so as to avoid the distance being too small and affecting the arrangement of the first tab 012 of the other electrode 001.

[0215] Based on this, in this embodiment, by limiting as described above, on the one hand, it can be avoided that the distance between the first tab end 121 and the electrode end 111 is too large, resulting in the length of the first tab 012 being too small, thereby ensuring that the length of the first tab 012 meets the current collection requirements of the electrode 001 and reduces the internal resistance of the cell; on the other hand, it can be avoided that the distance between the first tab end 121 and the electrode end 111 is too small, thus affecting the current collection area of ​​the first tab 012 of the other electrode 001 that cooperates with it.

[0216] Please see Figure 3 In one embodiment, along the second direction, the distance between the tail end 122 of the first electrode tab and the tail end 112 of the electrode plate is L. 21尾 The length dimension of the electrode body 011 is L. 20 Satisfying: 0 < L 21尾 ≤30% L 20 .

[0217] Understandable, L 21尾 Including but not limited to 1.7% L 20 4.6% L 20 9.1% L 20 14% L 20 19.6% L 20 22.6% L 20 28.7% L 20 29% L 20 30% L 20 .

[0218] For example:

[0219] L 20 When L is 5000mm, 21尾 The diameter can range from 250mm to 1500mm, for example, 250mm, 400mm, 800mm, 900mm, 1053mm, 1200mm, 1483mm, 1490mm, and 1500mm.

[0220] L 20 When L is 5200mm, 21尾 The diameter can range from 260mm to 1560mm, for example, 260mm, 400mm, 700mm, 900mm, 1150mm, 1300mm, 1458mm, 1460mm, and 1560mm.

[0221] L 20 When L is 6200mm, 21尾The diameter can range from 310mm to 1860mm, for example, 310mm, 600mm, 800mm, 1100mm, 1553mm, 1680mm, 1798mm, 1800mm, and 1860mm.

[0222] L 20 When L is 6400mm, 21尾 The diameter can range from 320mm to 1920mm, for example, 320mm, 480mm, 800mm, 1000mm, 1553mm, 1680mm, 1780mm, 1800mm, and 1920mm.

[0223] In this embodiment, through the above-mentioned arrangement, on the one hand, after the electrode sheet 001 is wound into an electrode assembly, the outer periphery of the first tab 012 and the outer periphery of the electrode assembly are arranged radially apart along the electrode assembly, so that the bent tab 014 is located in the interval and does not exceed the outer periphery of the electrode assembly; on the other hand, it can avoid the interval between the outer periphery of the first tab 012 and the electrode assembly being too large, which would affect the area of ​​the first tab 012, thereby ensuring that the current collection capacity and internal resistance of the first tab 012 meet the requirements.

[0224] Please see Figure 3 In one embodiment, the length dimension of the first electrode 012 along the second direction is L. 21耳 The length dimension of the electrode body 011 is L. 20 Satisfying: 30% L 20 ≤L 21耳 ≤50% L 20 .

[0225] Among them, L 21耳 Including but not limited to 30% L 20 33% L 20 35.2% L 20 38% L 20 40% L 20 42% L 20 46.4% L 20 49% L 20 50% L 20 .

[0226] For example:

[0227] L 20 When L is 5000mm, 21耳 It can be 1500mm to 2500mm, for example, 1500mm, 1700mm, 1812mm, 1940mm, 2053mm, 2280mm, 2380mm, 2402mm, 3500mm;

[0228] L 20 When L is 5200mm, 21耳 The diameter can be 1560mm to 2600mm, for example, 1560mm, 1640mm, 1800mm, 1900mm, 2053mm, 2200mm, 2380mm, 2460mm, 2600mm;

[0229] L 20 When L is 6200mm, 21耳 The diameter can range from 1860mm to 3100mm, for example, 1860mm, 1900mm, 2000mm, 2260mm, 2400mm, 2680mm, 2868mm, 3060mm, and 3100mm.

[0230] L 20 When L is 6400mm, 21耳 The range can be from 1920mm to 3200mm, for example, 1920mm, 2000mm, 2200mm, 2350mm, 2653mm, 2780mm, 2880mm, 3000mm, and 3200mm.

[0231] In this embodiment, the above limitations can, on the one hand, prevent the length of the first tab 012 from being too long and affecting the current collection area of ​​the first tab 012 of the other electrode 001 that it cooperates with; on the other hand, can prevent the length of the first tab 012 from being too small, thereby meeting the current collection requirements of the electrode 001 and reducing the internal resistance of the battery cell.

[0232] Please see Figure 3 In one embodiment, the first electrode 012 and the second electrode 013 are spaced apart along the second direction.

[0233] It is understandable that, along the first direction, the first electrode 012 and the second electrode 013 are completely misaligned.

[0234] In this embodiment, with the above-described configuration, when the electrode 001 is a negative electrode, the tab 014 of the positive electrode that cooperates with the electrode 001 can have a larger length, thereby increasing the tab area of ​​the positive electrode. It can also make the first tab 012 and the second tab 013 of the positive electrode have portions that are arranged opposite to each other along the first direction, so that the current collection path of the positive electrode is shorter, thereby improving the current collection capacity of the positive electrode.

[0235] Please see Figure 5 , Figure 5This is a schematic diagram of the coated area and the uncoated area provided in an embodiment of this application. In one embodiment, the electrode 001 includes a coated area coated with an active material and an uncoated area without an active material. The electrode body 011 is disposed in the coated area, and the tab 014 is disposed in the uncoated area.

[0236] Specifically, electrode 001 includes a current collector, on which a coated area and a non-coated area are provided. Along the width direction of electrode body 011, the non-coated area is disposed adjacent to the long side of electrode body 011. The current collector located in the non-coated area is formed into an electrode tab 014. The current collector located in the coated area is used to coat an active material.

[0237] In this embodiment, the current collector of the tab 014 and the electrode 001 are integrally formed, which can reduce the internal resistance of the electrode 001 and improve the stability of the connection between the tab 014 and the current collector.

[0238] Please see Figure 5 In one embodiment, the tab 014 is a die-cut tab 014. A die-cut tab 014 refers to a tab 014 of the desired shape that is cut out in the uncoated area of ​​the current collector using a mold and a cutting tool, such as a laser cutter.

[0239] In this embodiment, by using die-cut tabs 014, the forming method of tabs 014 can be simple and convenient, and the consistency of tabs 014 can be improved, ensuring that the shape, size and spacing of tabs 014 meet the design requirements.

[0240] Please see Figure 6 , Figure 6 This is a schematic diagram of the structure of the tab 014 provided in an embodiment of this application. In one embodiment, the die-cut width of the tab 014 is W, which satisfies 2mm≤W≤6mm.

[0241] For example, W includes, but is not limited to, 2mm, 2.2mm, 2.5mm, 2.6mm, 3mm, 3.2mm, 3.62mm, 4.15mm, 4.8mm, 5mm, 5.33mm, 5.42mm, 5.62mm, 5.82mm, 5.96mm, 5.99mm, and 6mm.

[0242] Specifically, if the distance from the electrode body 011 to the electrode tip 111 is within 35% of the length of the electrode body 011, the die-cutting width W of the tab 014 is 2-4 mm. If the distance from the electrode body 011 to the electrode tip 111 is greater than 35% of the length of the electrode body 011, the die-cutting width W of the tab 014 is 4-6 mm. Furthermore, the die-cutting width W of the tab 014 gradually increases as it moves away from the electrode tip 111. This reduces the obstruction to the flattening of the tab 014 at the connection point between the tab 014 and the coating area, thereby improving the ease of flattening the tab 014 and ultimately increasing the flattening efficiency.

[0243] In this embodiment, the above-mentioned limitations can, on the one hand, prevent the die-cut width of the tab 014 from being too small and easily breaking, thereby ensuring the reliability of the connection between the tab 014 and the coating area; on the other hand, can prevent the large die-cut width of the tab 014 from causing greater resistance to flattening the tab 014.

[0244] Please see Figure 6 In one embodiment, the die-cutting angle of the tab 014 is α, which satisfies 55°≤α≤85°.

[0245] It can be understood that the die-cutting angle is the acute angle between the laser cutting trajectory and the length direction of electrode 001.

[0246] For example, α includes, but is not limited to, 55°, 57.5°, 59°, 60°, 62.5°, 66°, 68°, 70°, 71.3°, 75°, 76.4°, 80°, 81°, 83.3°, 84°, and 85°.

[0247] In this embodiment, the above-mentioned limitations can guide the bending of the tab 014 when it is flattened, so that the adjacent tabs 014 are partially stacked, thereby reducing the interference between adjacent tabs 014 and improving the flatness of the stacked tabs 014 after flattening.

[0248] In one embodiment, the die-cutting height of the tab 014 is H, which satisfies: 5mm≤H≤7.5mm.

[0249] For example, H includes, but is not limited to, 5mm, 5.2mm, 5.48mm, 5.9mm, 6mm, 6.5mm, 6.7mm, 6.9mm, 7mm, 7.15mm, 7.3mm, 7.46mm, and 7.5mm.

[0250] In this embodiment, the above-mentioned limitations can, on the one hand, prevent the tab 014 from being cut too small, which would be detrimental to forming a sufficient welding surface for welding with the current collector after the tab 014 is bent; on the other hand, can prevent the tab 014 from being cut too large, which would occupy too much space inside the cell.

[0251] Please see Figure 7 , Figure 7 This is a schematic diagram of the structure of the electrode assembly 002 provided in an embodiment of this application. Accordingly, an embodiment of this application provides an electrode assembly 002, which includes the aforementioned electrode sheet 001.

[0252] It is understood that the electrode assembly 002 includes a positive electrode, a separator, and a negative electrode that are stacked or wound in sequence. The positive electrode is one of the aforementioned electrode 001, or the negative electrode is one of the aforementioned electrode 001, or the positive electrode is a part of the aforementioned electrode 001 and the negative electrode is another part of the aforementioned electrode 001.

[0253] Specifically, the first structure of the positive electrode can be as follows: the positive electrode includes an electrode body 011 and an electrode tab 014. In a first direction, the electrode body 011 has a first side 113 and a second side 114 disposed opposite to each other. The electrode tab 014 includes a first electrode tab 012 and a second electrode tab 013. The first electrode tab 012 is disposed on the first side 113, and the second electrode tab 013 is disposed on the second side 114. In a second direction, the electrode body 011 has an electrode head end 111 and an electrode tail end 112. In the second direction, the second electrode tab 013 is disposed further away from the electrode head end 111 than the first electrode tab 012. In the second direction, the second electrode tab 013 has a second electrode tab head end 131 close to the electrode head end 111. The second electrode tab head end 131 and the electrode head end 111 are spaced apart. Along the second direction, the distance between the second electrode tab head end 131 and the electrode head end 111 is L. 12头 The length dimension of the electrode body 011 is L. 10 Satisfying: 7% L 10 ≤L 12头 ≤20% L 10 Along the second direction, the length of the second electrode 013 is L. 12耳 Satisfying: 60% L 10 ≤L 12耳 ≤80% L 10 Along a first direction, the first electrode tab 012 and the second electrode tab 013 are disposed opposite to each other. In a second direction, the second electrode tab 013 has a second electrode tab tail end 132 near the electrode tail end 112, and the second electrode tab tail end 132 and the electrode tail end 112 are spaced apart. Along the second direction, the distance between the second electrode tab tail end 132 and the electrode tail end 112 is L. 12尾 Satisfying: 0 < L 12尾 ≤35% L 10 In the second direction, the first electrode tab 012 has a first electrode tab head end 121 near the electrode tip end 111 and a first electrode tab tail end 122 near the electrode tail end 112. Along the second direction, the first electrode tab tail end 122 and the electrode tail end 112 are spaced apart, and / or, along the second direction, the first electrode tab head end 121 and the electrode head end 111 are spaced apart. Along the second direction, the distance between the first electrode tab tail end 122 and the electrode tail end 112 is L. 11尾 The length dimension of the electrode body 011 is L. 10 Satisfying: L 11尾 =60% L 10 ~78% L10 Along the second direction, the distance between the first electrode tip 121 and the electrode tip 111 is L. 11头 The length dimension of the electrode body 011 is L. 10 Satisfying: L 11头 =7% L 10 ~20% L 10 Along the second direction, the length of the first electrode 012 is L. 11耳 The length dimension of the electrode body 011 is L. 10 Satisfying: L 11耳 =15% L 10 ~20% L 10 .

[0254] A second structure for the positive electrode can be as follows: The positive electrode includes an electrode body 011 and a tab 014. In a first direction, the electrode body 011 has a first side 113 and a second side 114 disposed opposite to each other. The tab 014 includes a first tab 012 and a second tab 013. The first tab 012 is disposed on the first side 113, and the second tab 013 is disposed on the second side 114. In a second direction, the electrode body 011 has an electrode head end 111 and an electrode tail end 112. In the second direction, the second tab 013 is disposed further away from the electrode head end 111 than the first tab 012. In the second direction, the second tab 013 has a second tab head end 131 close to the electrode head end 111. The second tab head end 131 and the electrode head end 111 are spaced apart. Along the second direction, the distance between the second tab head end 131 and the electrode head end 111 is L. 12头 The length dimension of the electrode body 011 is L. 10 Satisfying: 30% L 10 ≤L 12头 ≤40%L 10 Along the second direction, the length of the second electrode 013 is L. 12耳 Satisfying: L 12耳 =35% L 10 ~60% L 10 Along a first direction, the first electrode tab 012 and the second electrode tab 013 are partially opposite to each other. In a second direction, the second electrode tab 013 has a second electrode tab tail end 132 near the electrode tail end 112, and the second electrode tab tail end 132 and the electrode tail end 112 are spaced apart. Along the second direction, the distance between the second electrode tab tail end 132 and the electrode tail end 112 is L. 12尾 Satisfying: 0 < L 12尾 ≤35% L 10In the second direction, the first electrode tab 012 has a first electrode tab head end 121 near the electrode tip end 111 and a first electrode tab tail end 122 near the electrode tail end 112. Along the second direction, the first electrode tab tail end 122 and the electrode tail end 112 are spaced apart, and / or, along the second direction, the first electrode tab head end 121 and the electrode head end 111 are spaced apart. Along the second direction, the distance between the first electrode tab tail end 122 and the electrode tail end 112 is L. 11尾 The length dimension of the electrode body 011 is L. 10 Satisfying: L 11尾 =60% L 10 ~78% L 10 Along the second direction, the distance between the first electrode tip 121 and the electrode tip 111 is L. 11头 The length dimension of the electrode body 011 is L. 10 Satisfying: L 11头 =7% L 10 ~20% L 10 Along the second direction, the length of the first electrode 012 is L. 11耳 The length dimension of the electrode body 011 is L. 10 Satisfying: L 11耳 =15% L 10 ~20% L 10 .

[0255] Regarding the first and second structures of the positive electrode described above, the negative electrode can be a conventional structure, and may further include an electrode body 011 and a tab 014. In the first direction, the electrode body 011 has a first side 113 and a second side 114 disposed opposite to each other. The tab 014 includes a first tab 012 and a second tab 013. The first tab 012 is disposed on the first side 113, and the second tab 013 is disposed on the second side 114. In the second direction, the electrode body 011 has an electrode head end 111 and an electrode tail end 112. In the second direction, the second tab 013 is disposed closer to the electrode head end 111 than the first tab 012. In the second direction, the second tab 013 has a second tab head end 131 near the electrode head end 111, and the second tab head end 131 and the electrode head end 111 are spaced apart. Along the second direction, the distance between the second tab head end 131 and the electrode head end 111 is L. 22头 The length dimension of the electrode body 011 is L. 20 Satisfying: L 22头 =7% L 20 ~20% L 20 Along the second direction, the second electrode tab 013 has a second electrode tab tail end 132 near the tail end 112 of the electrode plate, and the second electrode tab tail end 132 and the tail end 112 of the electrode plate are spaced apart. Along the second direction, the length dimension of the second electrode tab 013 is L.22耳 The length dimension of the electrode body 011 is L. 20 Satisfying: L 22耳 =15% L 20 ~20%L 20 In the second direction, the first electrode tab 012 has a first electrode tab head end 121 near the electrode tip end 111 and a first electrode tab tail end 122 near the electrode tail end 112; along the second direction, the first electrode tab tail end 122 and the electrode tail end 112 are spaced apart, and / or, along the second direction, the first electrode tab head end 121 and the electrode tip end 111 are spaced apart. The distance between the first electrode tab head end 121 and the electrode tip end 111 along the second direction is L. 21头 The length dimension of the electrode body 011 is L. 20 Satisfying: 40% L 20 ≤L 21头 ≤50%L 20 Along the second direction, the distance between the tail end 122 of the first electrode ear and the tail end 112 of the electrode plate is L. 21尾 The length dimension of the electrode body 011 is L. 20 Satisfying: 0 < L 21尾 ≤30% L 20 Along the second direction, the length of the first electrode 012 is L. 21耳 The length dimension of the electrode body 011 is L. 20 Satisfying: 30% L 20 ≤L 21耳 ≤50% L 20 Along the second direction, the first electrode 012 and the second electrode 013 are spaced apart.

[0256] In this embodiment, by employing the aforementioned electrode 001, the electrode assembly 002 can have a larger tab area, thereby increasing the conduction path of electrons on the tab 014 and thus increasing the current collection area of ​​the electrode 001. This improves the current collection capability of the electrode assembly 002.

[0257] Please see Figure 8 , Figure 8 This is a schematic diagram of the structure of a battery cell 003 provided in an embodiment of this application. An embodiment of this application provides a battery cell 003, which includes the aforementioned electrode assembly 002.

[0258] It is understood that the battery cell 003 also includes a housing 031 and a cover plate 032. The housing 031 and the cover plate 032 cover each other to form a receiving cavity, and the electrode assembly 002 is disposed in the receiving cavity.

[0259] In this embodiment, by using the aforementioned electrode assembly 002, the current transmission inside the battery cell 003 can be smoother, the charging and discharging efficiency of the battery cell 003 can be higher, and the energy loss can be smaller.

[0260] In addition, by using the aforementioned electrode assembly 002, at least one polarity electrode 001 of the battery cell 003 can output the same polarity at both ends, thereby improving the operability of the battery cell 003 electrical connection.

[0261] Please see Figure 9 , Figure 9 This is a schematic diagram of the structure of a battery pack 004 provided in an embodiment of this application. The battery pack 004 includes a battery case 041 and the aforementioned battery cells 003. The battery case 041 has a receiving cavity. Multiple battery cells 003 are disposed within the receiving cavity.

[0262] In this embodiment, by using the aforementioned cell 003, the current transmission inside the battery pack 004 can be smoother, the charging and discharging efficiency of the battery pack 004 can be higher, and the energy loss can be smaller.

[0263] Please see Figure 10 , Figure 10 This is a schematic diagram of the structure of an electrical device 005 provided in an embodiment of this application. An embodiment of this application provides an electrical device 005, which includes the aforementioned battery cell 003 or the aforementioned battery pack 004, wherein the battery cell 003 or the battery pack 004 supplies power to the electrical device 005.

[0264] It is understood that electrical equipment 005 includes, but is not limited to, electric toys, power tools, electric vehicles, automobiles, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc. Automobiles can include gasoline-powered cars, natural gas-powered cars, and new energy vehicles.

[0265] In this embodiment, by using the aforementioned battery pack 004, the charging efficiency of the electrical device 005 can be improved, the energy utilization rate of the electrical device 005 can be increased, and the energy loss of the electrical device 005 can be reduced.

[0266] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. An electrode sheet, characterized in that, include: In a first direction, the electrode body has a first side and a second side disposed opposite to each other; The electrode includes a first electrode and a second electrode, wherein the first electrode is disposed on the first side and the second electrode is disposed on the second side.

2. The electrode sheet according to claim 1, characterized in that, In the second direction, the electrode body has an electrode head end and an electrode tail end; in the second direction, the second electrode tab is disposed further away from the electrode head end than the first electrode tab.

3. The electrode sheet according to claim 2, characterized in that, In the second direction, the second electrode tab has a second electrode tab head end near the electrode head end, and the second electrode tab head end and the electrode head end are spaced apart.

4. The electrode sheet according to claim 3, characterized in that, Along the second direction, the distance between the tip of the second electrode and the tip of the electrode plate is L. 12头 The length dimension of the electrode body is L. 10 Satisfying: 7% L 10 ≤L 12头 ≤20%L 10 .

5. The electrode sheet according to claim 4, characterized in that, Along the second direction, the length dimension of the second electrode tab is L. 12耳 Satisfying: 60% L 10 ≤L 12耳 ≤80%L 10 .

6. The electrode sheet according to claim 3, characterized in that, Along the second direction, the distance between the tip of the second electrode and the tip of the electrode plate is L. 12头 The length dimension of the electrode body is L. 10 Satisfying: 30% L 10 ≤L 12头 ≤40%L 10 .

7. The electrode sheet according to claim 6, characterized in that, Along the second direction, the length dimension of the second electrode tab is L. 12耳 Satisfying: L 12耳 =35%L 10 ~60%L 10 .

8. The electrode sheet according to any one of claims 2-7, characterized in that, Along the first direction, the first electrode and the second electrode are at least partially opposite to each other.

9. The electrode sheet according to claim 8, characterized in that, Along the first direction, the ends of the first electrode and the second electrode that are close to each other are arranged opposite each other, the end of the first electrode that is far away from the second electrode is misaligned with the second electrode, and the end of the second electrode that is far away from the first electrode is misaligned with the first electrode.

10. The electrode according to claim 8, characterized in that, The electrode has positive polarity.

11. The electrode sheet according to any one of claims 2-7, characterized in that, In the second direction, the second electrode tab has a second electrode tab tail end near the tail end of the electrode plate, and the tail end of the second electrode tab and the tail end of the electrode plate are spaced apart.

12. The electrode sheet according to claim 11, characterized in that, Along the second direction, the distance between the tail end of the second electrode tab and the tail end of the electrode plate is L. 12尾 The length dimension of the electrode body is L. 10 Satisfying: 0 < L 12尾 ≤33%L 10 .

13. The electrode sheet according to any one of claims 2-7, characterized in that, In the second direction, the first electrode tab has a first electrode tab head end near the head end of the electrode plate and a first electrode tab tail end near the tail end of the electrode plate; Along the second direction, the tail end of the first electrode tab and the tail end of the electrode plate are spaced apart; And / or, along the second direction, the first electrode tip and the electrode tip are spaced apart.

14. The electrode sheet according to claim 13, characterized in that, Along the second direction, the distance between the tail end of the first electrode tab and the tail end of the electrode plate is L. 11尾 The length dimension of the electrode body is L. 10 Satisfying: L 11尾 =60%L 10 ~78%L 10 .

15. The electrode sheet according to claim 13, characterized in that, Along the second direction, the distance between the tip of the first electrode tab and the tip of the electrode plate is L. 11头 The length dimension of the electrode body is L. 10 Satisfying: L 11头 =7%L 10 ~20%L 10 .

16. The electrode sheet according to claim 13, characterized in that, Along the second direction, the length dimension of the first electrode tab is L. 11耳 The length dimension of the electrode body is L. 10 Satisfying: L 11耳 =15%L 10 ~20%L 10 .

17. The electrode sheet according to claim 1, characterized in that, In the second direction, the electrode body has an electrode head end and an electrode tail end; in the second direction, the second electrode tab is disposed closer to the electrode head end than the first electrode tab.

18. The electrode sheet according to claim 17, characterized in that, In the second direction, the second electrode tab has a second electrode tab head end near the electrode head end, and the second electrode tab head end and the electrode head end are spaced apart.

19. The electrode according to claim 18, characterized in that, Along the second direction, the distance between the tip of the second electrode and the tip of the electrode plate is L. 22头 The length dimension of the electrode body is L. 20 Satisfying: L 22头 =7%L 20 ~20%L 20 .

20. The electrode sheet according to claim 17, characterized in that, Along the second direction, the second electrode tab has a second electrode tab tail end near the tail end of the electrode plate, and the tail end of the second electrode tab and the tail end of the electrode plate are spaced apart.

21. The electrode sheet according to claim 20, characterized in that, Along the second direction, there is a distance L between the tail end of the second electrode tab and the tail end of the electrode plate. 22尾 The length dimension of the electrode body is L. 20 Satisfying: L 22尾 =60L 20 ~78%L 20 .

22. The electrode sheet according to claim 17, characterized in that, Along the second direction, the length dimension of the second electrode tab is L. 22耳 The length dimension of the electrode body is L. 20 Satisfying: L 22耳 =15%L 20 ~20%L 20 .

23. The electrode sheet according to any one of claims 17-22, characterized in that, In the second direction, the first electrode tab has a first electrode tab head end near the head end of the electrode plate and a first electrode tab tail end near the tail end of the electrode plate; Along the second direction, the tail end of the first electrode tab and the tail end of the electrode plate are spaced apart; And / or, along the second direction, the first electrode tip and the electrode tip are spaced apart.

24. The electrode sheet according to claim 23, characterized in that, Along the second direction, the distance between the tip of the first electrode tab and the tip of the electrode plate is L. 21头 The length dimension of the electrode body is L. 20 Satisfying: 40% L 20 ≤L 21头 ≤50%L 20 .

25. The electrode sheet according to claim 23, characterized in that, Along the second direction, the distance between the tail end of the first electrode tab and the tail end of the electrode plate is L. 21尾 The length dimension of the electrode body is L. 20 Satisfying: 0 < L 21尾 ≤30%L 20 .

26. The electrode sheet according to claim 23, characterized in that, Along the second direction, the length dimension of the first electrode tab is L. 21耳 The length dimension of the electrode body is L. 20 Satisfying: 30% L 20 ≤L 21耳 ≤50%L 20 .

27. The electrode sheet according to any one of claims 17-22, characterized in that, Along the second direction, the first electrode and the second electrode are spaced apart.

28. The electrode sheet according to claim 27, characterized in that, The electrode has a negative polarity.

29. The electrode sheet according to any one of claims 1-7 and 17-22, characterized in that, The electrode includes a coated area coated with an active material and an uncoated area uncoated with an active material. The electrode body is disposed in the coated area, and the tab is disposed in the uncoated area.

30. The electrode sheet according to any one of claims 1-7 and 17-22, characterized in that, The electrode tab is a die-cut electrode tab.

31. The electrode sheet according to claim 30, characterized in that, The die-cut width of the electrode tab is W, which satisfies 2mm≤W≤6mm.

32. The electrode sheet according to claim 30, characterized in that, The die-cutting angle of the electrode tab is α, which satisfies 55°≤α≤85°.

33. The electrode sheet according to claim 30, characterized in that, The die-cut height of the electrode tab is H, which satisfies: 5mm≤H≤7.5mm.

34. An electrode assembly, characterized in that, Including the electrode as described in any one of claims 1-29.

35. A battery cell, characterized in that, Includes the electrode assembly as described in claim 34.

36. A battery pack, characterized in that, include: Battery box, with a receiving cavity; And, as in claim 35, there are multiple battery cells disposed in the receiving cavity.

37. An electrical appliance, characterized in that, Includes the battery cell as described in claim 35 or the battery pack as described in claim 36, wherein the battery cell or battery pack supplies power to the electrical device.

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