Electrode body and cylindrical lithium battery including the same

Abstract

The present invention provides an electrode body for a cylindrical lithium battery. The electrode body is a wound body formed by winding a laminated body. The laminated body includes a negative electrode sheet, a first separator, a positive electrode sheet, a plurality of positive electrode handles, and a plurality of negative electrode handles. The negative electrode sheet and the positive electrode sheet respectively have a negative electrode coating and a positive electrode coating. The present invention increases the capacitance of the electrode body by disposing the positive electrode coating on the positive electrode sheet in a specific configuration to increase the coating area of the positive electrode coating.

Description

Technical Field

[0001] The present invention relates to an electrode body and a cylindrical lithium battery comprising the same. Background Art

[0002] With technological advancements, more and more portable electronic products have become necessities of life, requiring batteries as a source of energy. Secondary batteries, in particular, are being adopted due to their advantages over primary batteries, such as being memory-free, compact, and reusable, making them more environmentally friendly. Among small secondary batteries, lithium-ion batteries have gradually replaced nickel-cadmium batteries, which are toxic and cause environmental pollution, as well as nickel-metal hydride batteries, which have lower volumetric energy density and higher temperatures.

[0003] Among lithium-ion batteries, cylindrical and prismatic are the most common. Cylindrical batteries utilize a mature winding process, resulting in a high degree of automation, stable product quality, and relatively low cost. While prismatic batteries have a simpler structure than cylindrical ones, they can be customized to meet product specifications, resulting in tens of thousands of different models on the market. This plethora of models makes standardized manufacturing processes difficult to achieve. Therefore, using cylindrical batteries, which can be produced in a standardized manner, ensures consistent production processes and facilitates the sourcing of replacement batteries.

[0004] In existing designs, cylindrical lithium batteries mostly use a combination of one positive electrode shank and one negative electrode shank, one positive electrode shank and two negative electrode shanks, or two positive electrode shanks and two negative electrode shanks. However, batteries with such combinations still have disadvantages such as short operating time, high operating temperature, and high impedance, making cylindrical lithium batteries difficult to use in mobile products that require high power / high capacity, especially power tools and electric cars / motorcycles. Summary of the Invention

[0005] In view of this, an object of the present invention is to provide a cylindrical lithium battery having low impedance, long operating time and low operating temperature, thereby significantly increasing the service life and application of the battery.

[0006] In order to achieve the above-mentioned object, the present invention provides an electrode body for a cylindrical lithium battery, which is a wound body formed by winding a laminated body, wherein the laminated body comprises a negative electrode sheet, a first separator, a positive electrode sheet, a plurality of positive electrode handles and a plurality of negative electrode handles. The negative electrode sheet is a negative electrode substrate, and the negative electrode substrate has a negative electrode upper surface and a negative electrode lower surface opposite to the negative electrode upper surface. The negative electrode upper surface has a first negative electrode coating, a first empty negative electrode coating, a second empty negative electrode coating and a third empty negative electrode coating. The negative electrode lower surface has a second negative electrode coating, a fourth empty negative electrode coating, a fifth empty negative electrode coating and a sixth empty negative electrode coating, wherein the first empty negative electrode coating is arranged opposite to the fourth empty negative electrode coating, the second empty negative electrode coating is arranged opposite to the fifth empty negative electrode coating, and the third empty negative electrode coating is arranged opposite to the fifth empty negative electrode coating. The electrode coating is arranged relative to the sixth empty negative electrode coating; wherein, the first diaphragm is arranged on the negative electrode sheet; wherein the positive electrode sheet is a positive electrode substrate, the positive electrode substrate has a positive electrode upper surface and a positive electrode lower surface opposite to the positive electrode upper surface, the positive electrode lower surface faces the negative electrode upper surface, the positive electrode upper surface has a first positive electrode coating, a first empty positive electrode coating, a second empty positive electrode coating and a third empty positive electrode coating, the positive electrode lower surface has a second positive electrode coating, a fourth empty positive electrode coating, a fifth empty positive electrode coating and a sixth empty positive electrode coating, wherein The first empty positive electrode coating and the fourth empty positive electrode coating are arranged opposite to each other, the second empty positive electrode coating and the fifth empty positive electrode coating are arranged alternately, and the third empty positive electrode coating and the sixth empty positive electrode coating are arranged opposite to each other; wherein one end of the first positive electrode handle in the plurality of positive electrode handles is connected to the first empty positive electrode coating or the fourth empty positive electrode coating, one end of the second positive electrode handle in the plurality of positive electrode handles is connected to the third empty positive electrode coating or the sixth empty positive electrode coating, and the other end of the first positive electrode handle and the other end of the second positive electrode handle respectively extend outward to protrude at one end of the wound body; wherein, one end of a first negative electrode handle among the plurality of negative electrode handles is connected to the first empty negative electrode coating or the fourth empty negative electrode coating, one end of a second negative electrode handle among the plurality of negative electrode handles is connected to the second empty electrode coating or the fifth empty negative electrode coating, one end of a third negative electrode handle among the plurality of negative electrode handles is connected to the third empty negative electrode coating or the sixth empty negative electrode coating, and the other end of the first negative electrode handle, the other end of the second negative electrode handle and the other end of the third negative electrode handle respectively extend outward and protrude from the other end of the wound body.

[0007] In one embodiment, the first positive electrode handle and the second positive electrode handle comprise aluminum foil.

[0008] In one embodiment, the first negative electrode handle, the second negative electrode handle, and the third negative electrode handle include copper foil, nickel foil, or copper-nickel alloy foil.

[0009] In one embodiment, the negative electrode sheet includes a winding end and a tail end, the first empty negative electrode coating is arranged at the winding end of the negative electrode sheet, the second empty negative electrode coating is arranged between 1 / 3 and 2 / 3 of the distance from the winding end of the negative electrode sheet, and the third empty negative electrode coating is arranged at the tail end of the negative electrode sheet.

[0010] In one embodiment, the positive electrode sheet includes a winding end and a tail end, the first empty positive electrode coating is arranged between the winding end of the positive electrode sheet and 1 / 4 of the distance from the winding end, and the third empty positive electrode coating is arranged between the tail end of the positive electrode sheet and 1 / 4 of the distance from the tail end.

[0011] In one embodiment, the fifth empty positive electrode coating faces the second empty negative electrode coating.

[0012] In one embodiment, the second empty positive electrode coating, the fourth empty positive electrode coating, the fifth empty positive electrode coating, and the sixth empty positive electrode coating are each covered with a tape.

[0013] In one embodiment, the first empty positive electrode coating and the third empty positive electrode coating are each covered with a tape, and the tape also covers the first positive electrode handle and the second positive electrode handle, respectively.

[0014] In one embodiment, the electrode body further includes a second separator, and the negative electrode sheet is located between the first separator and the second separator.

[0015] In one embodiment, the portion of the first negative electrode handle protruding from the winding body is located in a first radial direction and is a first distance from the center, the portion of the second negative electrode handle protruding from the winding body is located in a second radial direction and is a second distance from the center, and the portion of the third negative electrode handle protruding from the winding body is located in a third radial direction and is a third distance from the center. The first radial direction, the second radial direction, and the third radial direction divide the winding body into three different areas, and the third distance is greater than the second distance, and the second distance is greater than the first distance.

[0016] In one embodiment, portions of the first and third negative electrode handles protruding from the wound body have embossing, while a portion of the second negative electrode handle protruding from the wound body does not have embossing.

[0017] In one embodiment, one end of the first positive electrode handle and one end of the second positive electrode handle are respectively connected to the first empty positive electrode coating and the third empty positive electrode coating, or one end of the first positive electrode handle and one end of the second positive electrode handle are respectively connected to the fourth empty positive electrode coating and the sixth empty positive electrode coating; and one end of the first negative electrode handle, one end of the second negative electrode handle and one end of the third negative electrode handle are respectively connected to the first empty negative electrode coating, the second empty negative electrode coating and the third empty negative electrode coating, or one end of the first negative electrode handle, one end of the second negative electrode handle and one end of the third negative electrode handle are respectively connected to the fourth empty negative electrode coating, the fifth empty negative electrode coating and the sixth empty negative electrode coating.

[0018] In another embodiment, when one end of the first positive electrode handle and one end of the second positive electrode handle are respectively connected to the first empty positive electrode coating and the third empty positive electrode coating, one end of the first negative electrode handle, one end of the second negative electrode handle and one end of the third negative electrode handle are respectively connected to the first empty negative electrode coating, the second empty negative electrode coating and the third empty negative electrode coating.

[0019] In another embodiment, when one end of the first positive electrode handle and one end of the second positive electrode handle are respectively connected to the fourth empty positive electrode coating and the sixth empty positive electrode coating, one end of the first negative electrode handle, one end of the second negative electrode handle and one end of the third negative electrode handle are respectively connected to the fourth empty negative electrode coating, the fifth empty negative electrode coating and the sixth empty negative electrode coating.

[0020] The present invention also provides a cylindrical lithium battery comprising an outer shell, a positive electrode, and a negative electrode. The outer shell comprises a cover, a can, and a vertically extending accommodating space formed by the cover and can being sealed together. The positive electrode is embedded in the cover. The negative electrode is embedded in the can. The electrode body, as described above, is disposed in the accommodating space and is connected to the positive electrode via a first positive electrode handle and a second positive electrode handle. The electrode body is connected to the negative electrode via a first negative electrode handle, a second negative electrode handle, and a third negative electrode handle.

[0021] In another embodiment, the cylindrical lithium battery further includes an electrolyte disposed in the accommodating space.

[0022] In another embodiment, the cylindrical lithium battery further includes an upper insulating sheet and a lower insulating sheet, the upper insulating sheet is arranged between the positive electrode and the end of the winding body, and the lower insulating sheet is arranged between the negative electrode and the other end of the winding body, wherein the upper insulating sheet is a circular sheet structure and has a partial fan-shaped hole so that the other end of the first positive electrode handle and the other end of the second positive electrode handle pass through the partial fan-shaped hole and are connected to the positive electrode, and the lower insulating sheet is a partial circular sheet structure, and the radius of the partial circle is smaller than the radius of the other end of the winding body, so that the second negative electrode handle and the third negative electrode handle can be connected to the negative electrode along the edge of the lower insulating sheet, and the center of the partial circular sheet structure has a hole so that the first negative electrode handle can pass through the hole and be connected to the negative electrode.

[0023] In another embodiment, the portion of the first negative electrode handle protruding from the winding body, the portion of the second negative electrode handle protruding from the winding body, and the portion of the third negative electrode handle protruding from the winding body are stacked in sequence at the other end of the winding body, and the portion of the first negative electrode handle protruding from the winding body, the portion of the second negative electrode handle protruding from the winding body, and the portion of the third negative electrode handle protruding from the winding body are welded together and welded to the can body.

[0024] By placing the positive electrode coating on the positive electrode sheet in a specific configuration, the present invention not only increases the coating area of the positive electrode coating, thereby increasing the capacitance, but also ensures that the negative electrode coating on the upper surface of the negative electrode sheet is always present wherever the positive electrode coating on the lower surface of the positive electrode sheet faces, ignoring the presence of the first separator. This prevents metal precipitation and thus mitigates any potential hazards.

[0025] These and other aspects and embodiments will become readily apparent to those skilled in the relevant art(s) after reference to the following detailed description and accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The structural size ratios shown in the drawings do not limit the actual implementation of the present invention.

[0027] Figure 1 FIG. 1 is a cross-sectional view of a laminated body of an electrode according to an embodiment of the present invention.

[0028] Figure 2 FIG. 1 is a cross-sectional view of a laminated body of an electrode assembly according to a first comparative example.

[0029] Figure 3A FIG. 4 is a relationship diagram among voltage, time, and temperature according to an embodiment of the present invention and a first comparative example.

[0030] Figure 3B FIG. 4 is a relationship diagram between resistance and charge according to an embodiment of the present invention and a first comparative example.

[0031] Figure 4 FIG. 4 is a cross-sectional view of a laminated body of an electrode assembly according to a second comparative example.

[0032] Figure 5 FIG. 1 is a schematic cross-sectional view of a laminated body of an electrode assembly according to an embodiment of the present invention when the body is wound.

[0033] Figure 6A and Figure 6B Schematic diagrams of the negative electrode handle of an electrode body before and after assembly according to an embodiment of the present invention.

[0034] Figure 7 FIG. 1 is an exploded schematic diagram of a cylindrical lithium battery according to another embodiment of the present invention. DETAILED DESCRIPTION

[0035] The present invention provides an electrode body and a cylindrical lithium battery containing the same, in particular a cylindrical lithium battery having at least two (such as two, three, four, etc.) positive electrode handles and at least three (such as three, four, five, etc.) negative electrode handles.

[0036] Now, the embodiment of the present invention will be described in detail with reference to the accompanying drawings in which the same and / or corresponding components are denoted by the same reference characters.

[0037] Various embodiments will be disclosed herein; however, it is to be understood that the disclosed embodiments are intended only to serve as illustrations of the various forms that may be embodied. Furthermore, each example provided in connection with the various embodiments is intended to be illustrative and not limiting. Furthermore, the drawings are not necessarily to scale, with some features exaggerated to show details of particular components (and any dimensions, materials, and similar details shown in the drawings are intended to be illustrative only and not limiting). Therefore, the specific structural and functional details disclosed herein are not to be construed as limiting, but rather are intended to serve as a basis for teaching those skilled in the relevant art to practice the disclosed embodiments.

[0038] Figure 1FIG1 is a cross-sectional view of an electrode body 100 according to one embodiment of the present invention. The electrode body 100 is a layered body wound upward to form a jellyroll, wherein the layered body includes a negative electrode sheet 120, a first separator 140, a positive electrode sheet 160, a plurality of positive electrode handles 130, and a plurality of negative electrode handles 170. The negative electrode sheet 120 is a negative electrode substrate having a negative electrode upper surface 120 a and a negative electrode lower surface 120 b opposite the negative electrode upper surface 120 a. The negative electrode upper surface 120 a has a first negative electrode coating 121, a first empty negative electrode coating 131, a second empty negative electrode coating 132, and a third empty negative electrode coating 133. The negative electrode lower surface 120 b has a second negative electrode coating 122, a fourth empty negative electrode coating 134, a fifth empty negative electrode coating 135, and a sixth empty negative electrode coating 136. The first empty negative electrode coating 131 is disposed opposite the fourth empty negative electrode coating 134, the second empty negative electrode coating 132 is disposed opposite the fifth empty negative electrode coating 135, and the third empty negative electrode coating 133 is disposed opposite the sixth empty negative electrode coating 136. A first separator 140 is disposed on the negative electrode sheet 120. The positive electrode sheet 160 is a positive electrode substrate. The positive electrode substrate has a positive electrode upper surface 160a and a positive electrode lower surface 160b opposite to the positive electrode upper surface 160a. The positive electrode lower surface 160b faces the negative electrode upper surface 120a. The positive electrode upper surface 160a has a first positive electrode coating 161, a first empty positive electrode coating 171, a second empty positive electrode coating 172, and a third empty positive electrode coating 173. The positive electrode lower surface 160b has a second positive electrode coating 162, a fourth empty positive electrode coating 174, a fifth empty positive electrode coating 175, and a sixth empty positive electrode coating 176. The first empty positive electrode coating 171 is arranged opposite to the fourth empty positive electrode coating 174, the second empty positive electrode coating 172 is arranged alternately with the fifth empty positive electrode coating 175, and the third empty positive electrode coating 173 is arranged alternately with the fifth empty positive electrode coating 176. Arranged opposite the sixth empty positive electrode coating 176, one end of the first positive electrode shank 170a and one end of the second positive electrode shank 170b are connected to the first empty positive electrode coating 171 and the third empty positive electrode coating 173, respectively. The other ends of the first positive electrode shank 170a and the other ends of the second positive electrode shank 170b extend outward and protrude beyond one end of the wound body. One end of the first negative electrode shank 130a, one end of the second negative electrode shank 130b, and one end of the third negative electrode shank 130c are connected to the first empty negative electrode coating 131, the second empty negative electrode coating 132, and the third empty negative electrode coating 133, respectively. The other ends of the first negative electrode shank 130a, the second negative electrode shank 130b, and the third negative electrode shank 130c extend outward and protrude beyond the other end of the wound body. In one embodiment, the fifth empty positive electrode coating 175 faces the second empty negative electrode coating 132.In one embodiment, the area on the upper surface of the positive electrode sheet other than the empty positive electrode coating is the positive electrode coating; the area on the lower surface of the positive electrode sheet other than the empty positive electrode coating is the positive electrode coating; the area on the upper surface of the negative electrode sheet other than the empty negative electrode coating is the negative electrode coating; and the area on the lower surface of the negative electrode sheet other than the empty negative electrode coating is the negative electrode coating.

[0039] In one embodiment, the first positive electrode handle 170a and the second positive electrode handle 170b comprise aluminum foil. In one embodiment, the first negative electrode handle 130a, the second negative electrode handle 130b, and the third negative electrode handle 130c comprise copper foil, nickel foil, or a copper-nickel alloy foil. The term "empty negative electrode coating" in this disclosure refers to an area without a negative electrode coating. Similarly, the term "empty positive electrode coating" in this disclosure refers to an area without a positive electrode coating.

[0040] In one embodiment, the negative electrode sheet 120 includes a winding end A1 and a tail end A2. The first empty negative electrode coating 131 is disposed at the winding end A1 of the negative electrode sheet 120. The second empty negative electrode coating 132 is disposed between 1 / 3 and 2 / 3 of the distance from the winding end A1 of the negative electrode sheet 120. The third empty negative electrode coating 133 is disposed at the tail end A2 of the negative electrode sheet 120.

[0041] In one embodiment, the positive electrode sheet 160 includes a winding end C1 and a tail end C2. The first empty positive electrode coating 171 is disposed between the winding end C1 of the positive electrode sheet 160 and 1 / 4 of the distance from the winding end C1. The third empty positive electrode coating 173 is disposed between the tail end C1 of the positive electrode sheet 160 and 1 / 4 of the distance from the tail end C2.

[0042] In one embodiment, the second, fourth, fifth, and sixth positive electrode coatings 172, 174, 175, and 176 are each covered with tape 190 to prevent short circuits. In one embodiment, the first and third positive electrode coatings 171, 173 are each covered with tape 190 to prevent short circuits. The tape also covers the first and second positive electrode handles 170a, 170b.

[0043] In one embodiment, the electrode body 100 further includes a second separator 180 , and the negative electrode sheet 120 is located between the first separator 140 and the second separator 180 .

[0044] In one embodiment, the negative electrode handles and the positive electrode handles are connected to the negative electrode sheet and the positive electrode sheet respectively by welding, preferably ultrasonic welding.

[0045] In another embodiment of the present invention, one end of the first positive electrode handle 170a and one end of the second positive electrode handle 170b are respectively connected to the fourth empty positive electrode coating 174 and the sixth empty positive electrode coating 176, rather than being respectively connected to the first empty positive electrode coating 171 and the third empty positive electrode coating 173; and one end of the first negative electrode handle 130a, one end of the second negative electrode handle 130b and one end of the third negative electrode handle 130c are respectively connected to the fourth empty negative electrode coating 134, the fifth empty negative electrode coating 135 and the sixth empty negative electrode coating 136, rather than being respectively connected to the first empty negative electrode coating 131, the second empty negative electrode coating 132 and the third empty negative electrode coating 133.

[0046] Figure 2 FIG. 1 is a cross-sectional view of the laminated body of the electrode body 200 according to the first comparative example. Figure 2As shown, the electrode body 200 is a laminated body wound from bottom to top to form a wound body. The laminated body includes a negative electrode sheet 220, a first separator 240, a positive electrode sheet 260, two positive electrode handles 270, and two negative electrode handles 230. The negative electrode sheet 220 is a negative electrode substrate having a negative electrode upper surface 220a and a negative electrode lower surface 220b opposite the negative electrode upper surface 220a. The negative electrode upper surface 220a has a first negative electrode coating 221, a first empty negative electrode coating 231, and a second empty negative electrode coating 232. The negative electrode lower surface 220b has a second negative electrode coating 222, a third empty negative electrode coating 233, and a fourth empty negative electrode coating 234. The first empty negative electrode coating 231 is disposed opposite the third empty negative electrode coating 133, and the second empty negative electrode coating 232 is disposed opposite the fourth empty negative electrode coating 234. The first separator 240 is disposed on the negative electrode sheet 220. The positive electrode sheet 260 is a positive electrode substrate having a positive electrode upper surface 260 a and a positive electrode lower surface 260 b opposite to the positive electrode upper surface 260 a . The positive electrode lower surface 260 b faces the negative electrode upper surface 220 a (i.e., the positive electrode lower surface 260 b and the negative electrode upper surface 220 a are arranged opposite each other with the first separator 240 interposed therebetween). The positive electrode upper surface 260 a has a first positive electrode coating 261 , a first empty positive electrode coating 271 , and a second empty positive electrode coating 272 . The positive electrode lower surface 260 b has a second positive electrode coating 262 , a third empty positive electrode coating 273 , and a fourth empty positive electrode coating 274 . The first empty positive electrode coating 271 and the third empty positive electrode coating 273 are arranged opposite each other. The second empty positive electrode coating 272 is arranged opposite to the fourth empty positive electrode coating 274; wherein, one end of the first positive electrode handle 270a and one end of the second positive electrode handle 270b are connected to the first empty positive electrode coating 271 and the second empty positive electrode coating 272 respectively, and the other end of the first positive electrode handle 270a and the other end of the second positive electrode handle 270b respectively extend outward and protrude from one end of the wound body; wherein, one end of the first negative electrode handle 230a and one end of the second negative electrode handle 230b are connected to the first empty negative electrode coating 231 and the second empty negative electrode coating 232 respectively, and the other end of the first negative electrode handle 230a and the other end of the second negative electrode handle 230b respectively extend outward and protrude from the other end of the wound body. Compared with the laminated body of the electrode body 100 of one embodiment of the present invention, Figure 2 The laminated body shown contains only two positive and two negative electrode shanks.

[0047] Figure 3A Graph showing the relationship between the electrode body, voltage, operating time, and operating temperature in one embodiment of the present invention and a first comparative example. Figure 3B FIG. 4 is a relationship diagram between resistance and charge according to an embodiment of the present invention and a first comparative example. Figure 3AThe battery was tested under the following test conditions: at 23°C, charged at 1C to a rated voltage of 4.2V, and discharged at a high power of 95W to 2.0V. Figure 3B The test conditions are as follows: at 23°C, charge at 1C to a rated voltage of 4.2V, then discharge alternately at 1A and 10A to 2.0V. Figure 3A and Figure 3B It can be seen that the electrode body of the embodiment of the present invention has lower impedance, lower operating temperature and longer working time than the electrode body of the first comparative example due to the presence of three negative electrode handles. Therefore, the electrode body of the present invention is applied to cylindrical lithium batteries, which will greatly increase the battery life and application.

[0048] Figure 4 FIG. 1 is a cross-sectional view of the laminated body of the electrode body according to the second comparative example. Figure 4As shown, the electrode body 300 is a layered body wound from bottom to top, wherein the layered body includes a negative electrode sheet 320 , a first separator 340 , a positive electrode sheet 360 , two positive electrode handles 370 and three negative electrode handles 330 . The negative electrode sheet 320 is a negative electrode substrate having a negative electrode upper surface 320 a and a negative electrode lower surface 320 b opposite the negative electrode upper surface 320 a. The negative electrode upper surface 320 a has a first negative electrode coating 321, a first empty negative electrode coating 331, a second empty negative electrode coating 332, and a third empty negative electrode coating 333. The negative electrode lower surface 320 b has a second negative electrode coating 322, a fourth empty negative electrode coating 334, a fifth empty negative electrode coating 335, and a sixth empty negative electrode coating 336. The first empty negative electrode coating 331 is opposite the fourth empty negative electrode coating 334, the second empty negative electrode coating 332 is opposite the fifth empty negative electrode coating 335, and the third empty negative electrode coating 333 is opposite the sixth empty negative electrode coating 336. A first separator 340 is disposed on the negative electrode sheet 320. Among them, the positive electrode sheet 360 is a positive electrode substrate, the positive electrode substrate has a positive electrode upper surface 360a and a positive electrode lower surface 360b opposite to the positive electrode upper surface 360a, the positive electrode lower surface 360b faces the negative electrode upper surface 320a, the positive electrode upper surface 360a has a first positive electrode coating 361, a first empty positive electrode coating 371, a second empty positive electrode coating 372 and a third empty positive electrode coating 373, the positive electrode lower surface 360b has a second positive electrode coating 362, a fourth empty positive electrode coating 374, a fifth empty positive electrode coating 375 and a sixth empty positive electrode coating 376, wherein the first empty positive electrode coating 371 is arranged opposite to the fourth empty positive electrode coating 374, the second empty positive electrode coating 372 is arranged opposite to the fifth empty positive electrode coating 375, and the third empty positive electrode coating 373 is arranged opposite to the sixth empty positive electrode coating 376. The fifth empty positive electrode coating 375 faces the second empty negative electrode coating 332; wherein, one end of the first positive electrode handle 370a and one end of the second positive electrode handle 370b are respectively connected to the first empty positive electrode coating 371 and the third empty positive electrode coating 373, and the other end of the first positive electrode handle 370a and the other end of the second positive electrode handle 370b respectively extend outward and protrude from one end of the winding body; wherein, one end of the first negative electrode handle 330a, one end of the second negative electrode handle 330b and one end of the third negative electrode handle 330c are respectively connected to the first empty negative electrode coating 331, the second empty negative electrode coating 332 and the third empty negative electrode coating 333, and the other end of the first negative electrode handle 330a, the other end of the second negative electrode handle 330b and the other end of the third negative electrode handle 330c respectively extend outward and protrude from the other end of the winding body.

[0049] Compared with the electrode body of the second comparative example, the electrode body of the embodiment of the present invention has a problem of low capacitance because the area of the positive electrode sheet 360 coated with the positive electrode coating is reduced. Figure 1 As shown, by staggering the second empty positive electrode coating 172 and the fifth empty positive electrode coating 175, the coating area is increased and the capacitance is also increased. In one example, when the total length of the positive electrode sheets is 1200 mm, the total length difference of the coating area of the electrode body of the embodiment of the present invention and the electrode body of the second comparative example is 42 mm, which means that the capacitance difference between the two is 42 / 1200 = 3.5%. It is obvious that the electrode system of the present invention has excellent capacitance. As can be seen from the above, compared with the laminated body of the electrode body 100 of one embodiment of the present invention, Figure 4 Although the stacked body shown also contains two positive electrode shanks and three negative electrode shanks, its positive electrode coating configuration does not effectively utilize space, resulting in a small coating area for the positive electrode coating, thereby failing to increase capacitance. Figure 4 In the embodiment, the second empty positive electrode coating 372 and the fifth empty electrode coating 375 of the laminated body 300 are not as Figure 1 The second empty positive electrode coating 172 and the fifth empty electrode coating 175 are staggered, so that the area of the second empty positive electrode coating 372 and the fifth empty electrode coating 375 are larger than the area of the second empty negative electrode coating 332, making the positive electrode coating relatively small, thus failing to increase the capacitance. Figure 1 The second empty positive electrode coating 172 and the fifth empty electrode coating 175 are staggered so that the respective areas of the second empty positive electrode coating 172 and the fifth empty electrode coating 175 are similar to (or even equal to) the area 132 of the second empty negative electrode coating, making the positive electrode coating relatively larger, thereby increasing the capacitance.

[0050] In one embodiment, the staggered arrangement of the second empty positive electrode coating 172 and the fifth empty positive electrode coating 175 is achieved by mixing prepared positive and negative electrode raw materials into a slurry and simultaneously applying the slurry to the positive electrode upper surface 160a, the positive electrode lower surface 160b, and the negative electrode upper surface 120a, the negative electrode lower surface 120b. A person skilled in the art can adjust relevant parameters, such as coating position, length, width, and gap, based on their common knowledge, to achieve the staggered arrangement of the second empty positive electrode coating 172 and the fifth empty positive electrode coating 175. As previously mentioned, this arrangement increases the coating area, thereby improving capacitance.

[0051] Figure 5It is a cross-sectional schematic diagram of the laminated body of the electrode body 100 according to one embodiment of the present invention when it is wound. The portion of the first negative electrode handle 130a protruding from the winding body 102 is located in the first radial direction D1, and is a first distance R1 from the center O. The portion of the second negative electrode handle 130b protruding from the winding body 102 is located in the second radial direction D2, and is a second distance R2 from the center. The portion of the third negative electrode handle 130c protruding from the winding body 102 is located in the third radial direction D3, and is a third distance R3 from the center. The first radial direction R1, the second radial direction R2 and the third radial direction R3 divide the winding body into three different areas. There is no special restriction on the angles between the first radial direction R1, the second radial direction R2 and the third radial direction R3, and the third distance R3 is greater than the second distance R2, and the second distance R2 is greater than the first distance R1. Such a configuration will help the negative electrode handles to be more easily welded together when assembled to form a battery. By Figure 5 It can also be known that the electrode body 100 of the embodiment of the present invention can be wound from the winding end to obtain a wound body.

[0052] Figure 6A and Figure 6B Schematic diagram of the first negative electrode handle 130a, the second negative electrode handle 130b and the third negative electrode handle 130c of the electrode body 100 before and after assembly according to one embodiment of the present invention, wherein the dark portion above the electrode body 100 is the insulating sheet 110b. Figure 6A In the embodiment, after the electrode body 100 is wound into the wound body 102, the first negative electrode handle 130a, the second negative electrode handle 130b and the third negative electrode handle 130c are originally perpendicular to the insulating sheet 110b. Figure 6B In the embodiment, the first negative electrode handle 130a, the second negative electrode handle 130b and the third negative electrode handle 130c are bent and close to the insulating sheet 110b, and the second negative electrode handle 130b is above the first negative electrode handle 130a, and the third negative electrode handle 130c is above the second negative electrode handle 130b.

[0053] Figure 7 A schematic diagram of an exploded view of a cylindrical lithium battery 10 according to another embodiment of the present invention. The cylindrical lithium battery 10 includes a housing 12, a positive electrode 20, and a negative electrode 30. The housing 12 includes a cover 14, a can 16, and a vertically extending accommodating space 18 formed by the cover 14 and the can 16 being sealed together. The positive electrode 20 is embedded in the cover 14. The negative electrode 30 is embedded in the can 16. The electrode body 100, as described in the above embodiment, is disposed in the accommodating space 18. The electrode body 100 is electrically connected to the positive electrode 20 via a first positive electrode handle 170a and a second positive electrode handle 170b. The electrode body 100 is electrically connected to the negative electrode 30 via a first negative electrode handle 130a, a second negative electrode handle 130b, and a third negative electrode handle 130c.

[0054] According to another embodiment of the present invention, the cylindrical lithium battery 10 further comprises an upper insulating sheet 110a (eg Figure 7 As shown) and a lower insulating sheet 110b (as shown Figure 6A and Figure 6B As shown in the figure, the upper insulating sheet 110a is disposed between the positive electrode 20 and the end of the jellyroll 102, and the lower insulating sheet 110b is disposed between the negative electrode 30 and the other end of the jellyroll 102. The upper insulating sheet 110a is a circular sheet structure and has a partial fan-shaped hole so that the other end of the first positive electrode handle 170a and the other end of the second positive electrode handle 170b can pass through the partial fan-shaped hole and be electrically connected to the positive electrode 20 (not shown). After passing through the partial fan-shaped holes, the first positive electrode handle and the second positive electrode handle are folded toward the central axis of the jellyroll 102 to form a layered structure (i.e., the second positive electrode handle 170b is stacked on the first positive electrode handle 170a), so as to facilitate the subsequent assembly of the jellyroll into a cylindrical lithium battery. Please refer to Figure 6A 、 Figure 6B and Figure 7 The lower insulating sheet 110b is a partially circular sheet structure, and the radius of the partial circle is smaller than the radius of the other end of the winding body 102, so that the second negative electrode handle 130b and the third negative electrode handle 130c can be electrically connected to the negative electrode 30 along the edge of the lower insulating sheet. The center of the partially circular sheet structure has a hole, so that the first negative electrode handle 130a can pass through the hole and be electrically connected to the negative electrode 30 (not shown).

[0055] While the present invention has been described with reference to one or more embodiments of the electrode assembly and cylindrical lithium battery incorporating the same, it should be understood that the present disclosure is not limited to the disclosed embodiments. For example, the number of positive and negative electrode handles in the present invention is not limited to the disclosed embodiments. The present invention encompasses various modifications and similar configurations within the spirit and scope of the claims, and should be given the broadest interpretation to encompass all modifications and similar structures. The present disclosure also encompasses all embodiments within the scope of the following claims.

[0056]

Explanation of symbols

[0057] 10 Cylindrical lithium battery

[0058] 12 Housing

[0059] 14 Cover

[0060] 16 tank

[0061] 18 Storage Space

[0062] 20 positive electrode

[0063] 30 Negative electrode

[0064] 100 Electrode body

[0065] 102 winding body

[0066] 110a Upper insulation sheet

[0067] 110b lower insulation sheet

[0068] 120 negative electrode sheet

[0069] 120a negative electrode upper surface

[0070] 120b negative electrode bottom surface

[0071] 121 first negative electrode coating

[0072] 122 second negative electrode coating

[0073] 130 negative electrode handle

[0074] 130a First negative electrode handle

[0075] 130b Second negative electrode handle

[0076] 130c third negative pole handle

[0077] 131 First Empty Negative Electrode Coating

[0078] 132 Second empty negative electrode coating

[0079] 133 Third empty negative electrode coating

[0080] 134 Fourth empty negative electrode coating

[0081] 135 Fifth Empty Negative Electrode Coating

[0082] 136 Sixth Empty Negative Electrode Coating

[0083] 140 First Diaphragm

[0084] 160 positive electrode

[0085] 160a positive electrode upper surface

[0086] 160b lower surface of positive electrode

[0087] 161 First positive electrode coating

[0088] 162 Second positive electrode coating

[0089] 170 positive pole handle

[0090] 170a First positive pole handle

[0091] 170b Second positive pole handle

[0092] 171 First Empty Positive Electrode Coating

[0093] 172 Second empty positive electrode coating

[0094] 173 Third empty positive electrode coating

[0095] 174 Fourth empty positive electrode coating

[0096] 175 Fifth Empty Positive Electrode Coating

[0097] 176 Sixth Empty Positive Electrode Coating

[0098] 180 Second Diaphragm

[0099] 190 tape

[0100] 200 electrode body

[0101] 220 negative electrode sheet

[0102] 220a negative electrode upper surface

[0103] 220b negative electrode bottom surface

[0104] 221 first negative electrode coating

[0105] 222 Second negative electrode coating

[0106] 230 negative electrode handle

[0107] 230a First negative electrode handle

[0108] 230b Second negative pole handle

[0109] 231 First Empty Negative Electrode Coating

[0110] 232 Second empty negative electrode coating

[0111] 233 Third empty negative electrode coating

[0112] 234 Fourth empty negative electrode coating

[0113] 240 First Diaphragm

[0114] 260 positive electrode

[0115] 260a positive electrode upper surface

[0116] 260b lower surface of positive electrode

[0117] 261 First positive electrode coating

[0118] 262 Second positive electrode coating

[0119] 270 positive pole handle

[0120] 270a First positive pole handle

[0121] 270b Second positive pole handle

[0122] 271 First Empty Positive Electrode Coating

[0123] 272 Second empty positive electrode coating

[0124] 273 Third empty positive electrode coating

[0125] 274 Fourth empty positive electrode coating

[0126] 280 Second Diaphragm

[0127] 300 electrode body

[0128] 320 negative electrode sheet

[0129] 320a negative electrode upper surface

[0130] 320b negative electrode bottom surface

[0131] 321 first negative electrode coating

[0132] 322 Second negative electrode coating

[0133] 330 negative electrode handle

[0134] 330a First negative electrode handle

[0135] 330b Second negative pole handle

[0136] 330c third negative pole handle

[0137] 331 First Empty Negative Electrode Coating

[0138] 332 Second empty negative electrode coating

[0139] 333 Third empty negative electrode coating

[0140] 334 Fourth empty negative electrode coating

[0141] 335 Fifth Empty Negative Electrode Coating

[0142] 336 Sixth Empty Negative Electrode Coating

[0143] 340 First Diaphragm

[0144] 360 positive electrode sheet

[0145] 360a positive electrode upper surface

[0146] 360b lower surface of positive electrode

[0147] 361 First positive electrode coating

[0148] 362 Second positive electrode coating

[0149] 370 positive pole handle

[0150] 370a First positive pole handle

[0151] 370b Second positive handle

[0152] 371 First Empty Positive Electrode Coating

[0153] 372 Second empty positive electrode coating

[0154] 373 Third empty positive electrode coating

[0155] 374 Fourth Empty Positive Electrode Coating

[0156] 375 Fifth Air Positive Electrode Coating

[0157] 376 Sixth Empty Positive Electrode Coating

[0158] 380 Second Diaphragm

[0159] A1 winding end

[0160] A2 tail

[0161] C1 winding end

[0162] C2 tail

[0163] D1 First radial

[0164] D2 Second radial

[0165] D3 Third Radial

[0166] R1 First Distance

[0167] R2 Second distance

[0168] R3 Third distance

Claims

1. An electrode body for a cylindrical lithium battery, comprising a laminated body wound into a jellyroll, wherein the laminated body comprises: A negative electrode sheet, which is a negative electrode substrate, the negative electrode substrate having a negative electrode upper surface and a negative electrode lower surface opposite to the negative electrode upper surface, the negative electrode upper surface having a first negative electrode coating, a first empty negative electrode coating, a second empty negative electrode coating, and a third empty negative electrode coating, and the negative electrode lower surface having a second negative electrode coating, a fourth empty negative electrode coating, a fifth empty negative electrode coating, and a sixth empty negative electrode coating, wherein the first empty negative electrode coating is arranged opposite to the fourth empty negative electrode coating, the second empty negative electrode coating is arranged opposite to the fifth empty negative electrode coating, and the third empty negative electrode coating is arranged opposite to the sixth empty negative electrode coating; a first diaphragm disposed on the negative electrode sheet; A positive electrode sheet disposed on the first separator, the positive electrode sheet being a positive electrode substrate, the positive electrode substrate having a positive electrode upper surface and a positive electrode lower surface opposite to the positive electrode upper surface, the positive electrode lower surface facing the negative electrode upper surface, the positive electrode upper surface having a first positive electrode coating, a first empty positive electrode coating, a second empty positive electrode coating, and a third empty positive electrode coating, the positive electrode lower surface having a second positive electrode coating, a fourth empty positive electrode coating, a fifth empty positive electrode coating, and a sixth empty positive electrode coating, wherein the first empty positive electrode coating is arranged opposite to the fourth empty positive electrode coating, the second empty positive electrode coating and the fifth empty positive electrode coating are arranged alternately without overlap, the third empty positive electrode coating is arranged opposite to the sixth empty positive electrode coating, and wherein the fifth empty positive electrode coating faces the second empty negative electrode coating; a plurality of positive electrode handles, wherein one end of a first positive electrode handle among the plurality of positive electrode handles is connected to the first empty positive electrode coating or the fourth empty positive electrode coating, one end of a second positive electrode handle among the plurality of positive electrode handles is connected to the third empty positive electrode coating or the sixth empty positive electrode coating, and the other end of the first positive electrode handle and the other end of the second positive electrode handle respectively extend outward and protrude from one end of the wound body; and A plurality of negative electrode handles, wherein one end of a first negative electrode handle among the plurality of negative electrode handles is connected to the first empty negative electrode coating or the fourth empty negative electrode coating, one end of a second negative electrode handle among the plurality of negative electrode handles is connected to the second empty negative electrode coating or the fifth empty negative electrode coating, one end of a third negative electrode handle among the plurality of negative electrode handles is connected to the third empty negative electrode coating or the sixth empty negative electrode coating, and the other end of the first negative electrode handle, the other end of the second negative electrode handle and the other end of the third negative electrode handle respectively extend outward and protrude from the other end of the wound body. 2 . The electrode body as claimed in claim 1 , wherein the first positive electrode handle and the second positive electrode handle comprise aluminum foil. 3 . The electrode body as claimed in claim 1 , wherein the first negative electrode handle, the second negative electrode handle and the third negative electrode handle comprise copper foil, nickel foil or copper-nickel alloy foil.

4. The electrode body as described in claim 1, wherein the negative electrode sheet has a winding end and a tail end, the first empty negative electrode coating is arranged at the winding end of the negative electrode sheet, the second empty negative electrode coating is arranged between 1 / 3 and 2 / 3 of the distance from the winding end of the negative electrode sheet, and the third empty negative electrode coating is arranged at the tail end of the negative electrode sheet.

5. The electrode body as described in claim 1, wherein the positive electrode sheet includes a winding end and a tail end, the first empty positive electrode coating is arranged between the winding end of the positive electrode sheet and 1 / 4 of the distance from the winding end, and the third empty positive electrode coating is arranged between the tail end of the positive electrode sheet and 1 / 4 of the distance from the tail end. 6 . The electrode body as claimed in claim 1 , wherein the second empty positive electrode coating layer, the fourth empty positive electrode coating layer, the fifth empty positive electrode coating layer, and the sixth empty positive electrode coating layer are each covered with a tape. 7 . The electrode body as claimed in claim 1 , wherein the first empty positive electrode coating and the third empty positive electrode coating are each covered with a tape, and the tape also covers the first positive electrode handle and the second positive electrode handle respectively. 8 . The electrode body according to claim 1 , further comprising a second separator, wherein the negative electrode sheet is interposed between the first separator and the second separator.

9. An electrode body as described in claim 1, wherein the portion of the first negative electrode handle protruding from the wound body is located in a first radial direction and is a first distance from the center, the portion of the second negative electrode handle protruding from the wound body is located in a second radial direction and is a second distance from the center, and the portion of the third negative electrode handle protruding from the wound body is located in a third radial direction and is a third distance from the center, the first radial direction, the second radial direction and the third radial direction divide the wound body into three different areas, and the third distance is greater than the second distance, and the second distance is greater than the first distance.

10. The electrode body as described in claim 1, wherein one end of the first positive electrode handle and one end of the second positive electrode handle are respectively connected to the first empty positive electrode coating and the third empty positive electrode coating, or one end of the first positive electrode handle and one end of the second positive electrode handle are respectively connected to the fourth empty positive electrode coating and the sixth empty positive electrode coating; and one end of the first negative electrode handle, one end of the second negative electrode handle and one end of the third negative electrode handle are respectively connected to the first empty negative electrode coating, the second empty negative electrode coating and the third empty negative electrode coating, or one end of the first negative electrode handle, one end of the second negative electrode handle and one end of the third negative electrode handle are respectively connected to the fourth empty negative electrode coating, the fifth empty negative electrode coating and the sixth empty negative electrode coating.

11. A cylindrical lithium battery comprising: The housing comprises a cover, a tank body, and a vertically penetrating accommodation space formed by the cover and the tank body being sealed and joined to each other; a positive electrode embedded in the cover; a negative electrode, buried in the tank; The electrode body as described in claim 1 is arranged in the accommodating space, the electrode body is connected to the positive electrode through the first positive electrode handle and the second positive electrode handle, and the electrode body is connected to the negative electrode through the first negative electrode handle, the second negative electrode handle and the third negative electrode handle. 12 . The cylindrical lithium battery as claimed in claim 11 , further comprising an electrolyte, wherein the electrolyte is disposed in the accommodating space.

13. The cylindrical lithium battery as described in claim 11 further comprises an upper insulating sheet and a lower insulating sheet, the upper insulating sheet is arranged between the positive electrode and the one end of the winding body, and the lower insulating sheet is arranged between the negative electrode and the other end of the winding body, wherein the upper insulating sheet is a circular sheet structure and has a partial fan-shaped hole so that the other end of the first positive electrode handle and the other end of the second positive electrode handle pass through the partial fan-shaped hole and are connected to the positive electrode, the lower insulating sheet is a partial circular sheet structure, and the radius of the partial circle is smaller than the radius of the other end of the winding body, so that the second negative electrode handle and the third negative electrode handle can be connected to the negative electrode along the edge of the lower insulating sheet, and the center of the partial circular sheet structure has a hole so that the first negative electrode handle can pass through the hole and be connected to the negative electrode.

14. The cylindrical lithium battery of claim 13 , wherein the portion of the first negative electrode handle protruding from the wound body, the portion of the second negative electrode handle protruding from the wound body, and the portion of the third negative electrode handle protruding from the wound body are sequentially stacked on the other end of the wound body, and the portion of the first negative electrode handle protruding from the wound body, the portion of the second negative electrode handle protruding from the wound body, and the portion of the third negative electrode handle protruding from the wound body are welded together and welded to the can body.

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