A multi-electrode cylindrical soft-pack battery structure

Abstract

The present application relates to the technical field of battery cell structure, and in particular to a multi-electrode lug cylindrical soft-pack battery structure, comprising a winding core, wherein the winding core is formed by overlapping and winding a positive electrode sheet, a separator and a negative electrode sheet, and a plurality of inner pole lugs integrally formed with the positive electrode sheet and the negative electrode sheet are respectively formed at both ends of the winding core, circular nickel sheets are arranged at both ends of the winding core, and a plurality of ends of the inner pole lugs are bent and connected to the top of the circular nickel sheet, and an outer pole lug is fixedly arranged on the inner pole lug, and the winding core is formed by winding the inner pole lug, the separator and the outer pole lug, and then the plurality of ends of the inner pole lugs formed at both ends of the winding core are bent toward the center of the circular nickel sheet, and then the outer pole lugs are fixedly arranged on the inner pole lugs, so as to realize the application of the multi-electrode lug structure of the cylindrical soft-pack battery, avoid the low discharge rate efficiency of the battery during use, ensure the conversion rate of the cylindrical soft-pack battery, and indirectly improve the battery capacity life.

Description

Technical Field

[0001] The present application relates to the technical field of battery cell structures, and in particular to a multi-electrode cylindrical soft-pack battery structure. Background Art

[0002] Soft-pack batteries have the advantages of high energy density and good cycle performance, and are widely used in the fields of power and energy storage. Before being used, soft-pack batteries usually use welding technology to connect the positive and negative poles of the battery to the pole ears. Most of the soft-pack batteries currently used have a multi-pole ear structure, which is used in square soft-pack batteries, square aluminum shell batteries, and steel shell cylindrical batteries. However, the existing cylindrical soft-pack batteries are mostly single-pole ear structures in the application field. This structure has the problem that when the pole ear is too long during the application process, the electron conduction path is too long, resulting in low discharge rate efficiency, and most of the energy generated is converted into heat energy and dissipated, resulting in low battery capacity. Utility Model Content

[0003] In order to solve the above technical problems, the present application provides a multi-pole ear cylindrical soft-pack battery structure, including a winding core, wherein the winding core is formed by overlapping and winding a positive electrode sheet, a diaphragm and a negative electrode sheet, and a plurality of inner pole ears integrally formed with the positive electrode sheet and the negative electrode sheet are respectively formed at both ends of the winding core, and circular nickel sheets are arranged at both ends of the winding core, and a plurality of ends of the inner pole ears are bent and connected to the top of the circular nickel sheet, and an outer pole ear is also fixedly arranged on the inner pole ear, so as to realize the application of the multi-pole ear structure of the cylindrical soft-pack battery, avoid the low discharge rate efficiency of the battery during use, ensure the conversion rate of the cylindrical soft-pack battery, and indirectly improve the battery capacity life.

[0004] Preferably, several ends of the inner pole ears are bent toward the center of the circular nickel sheet, and several ends of the inner pole ears overlap at the center of the circular nickel sheet, so that several inner pole ears are stacked to complete the multi-pole ear structure of the cylindrical soft-pack battery.

[0005] Preferably, a plurality of inner pole ears are formed on one side of the positive electrode sheet and the negative electrode sheet, the inner pole ear of the positive electrode sheet is located at one end of the winding core, and the inner pole ear of the negative electrode sheet is located at the other end of the winding core, so that the positive electrode sheet and the negative electrode sheet are wound and form the two poles of the cylindrical soft-pack battery through the inner pole ears.

[0006] Preferably, the width of the inner tab is 2-6 mm, the thickness of the outer tab is 0.15-2 mm, the circular nickel sheet is circular in shape, the diameter of the circular nickel sheet is 8-14 mm, and the thickness of the circular nickel sheet is 0.2-0.3 mm.

[0007] Preferably, a current collector is formed on the other side of the positive electrode sheet and the negative electrode sheet relative to the inner electrode tab, and a coating layer is coated on one side of the surface of the current collector.

[0008] Preferably, the length of the inner pole ear increases along the length direction of the positive electrode sheet and the negative electrode sheet, so as to avoid welding misalignment on the circular nickel sheet when the inner pole ear is folded.

[0009] Preferably, the exposed part of the circular nickel sheet is covered with high temperature glue for insulation to prevent the circular nickel sheet from contacting with the outer aluminum-plastic film and causing a short circuit.

[0010] Preferably, the inner pole ear and the outer pole ear are also covered with PI adhesive stickers for insulation and fixation, so as to achieve insulation and fixation of the inner pole ear and the outer pole ear and prevent the inner pole ear from breaking during the packaging process.

[0011] From the above, it can be seen that the application of the present application can obtain the following beneficial effects: the present application adopts a winding core, wherein the winding core is formed by winding a positive electrode sheet, a diaphragm and a negative electrode sheet in an overlapping manner, and a plurality of inner pole ears integrally formed with the positive electrode sheet and the negative electrode sheet are formed at both ends of the winding core respectively, and circular nickel sheets are arranged at both ends of the winding core, and a plurality of ends of the inner pole ears are bent and connected to the top of the circular nickel sheet, and an outer pole ear is fixedly arranged on the inner pole ear, and the winding core is formed by winding the inner pole ear, the diaphragm and the outer pole ear, and the circular nickel sheets are placed at both ends of the winding core, and then the plurality of ends of the inner pole ears formed at both ends of the winding core are bent toward the center of the circular nickel sheet, and then the outer pole ear is fixedly arranged on the inner pole ear, so as to realize the application of a multi-pole ear structure of a cylindrical soft-pack battery, avoid the low discharge rate efficiency of the battery during use, ensure the conversion rate of the cylindrical soft-pack battery, and indirectly improve the battery capacity life. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings required for use in the description of the embodiments of the present application or the prior art are briefly introduced below. Obviously, the drawings described below are only part of the embodiments of the present application, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor.

[0013] Figure 1 A top view of a multi-electrode cylindrical soft-pack battery structure according to an embodiment of the present application;

[0014] Figure 2 This is a front view of a multi-electrode cylindrical soft-pack battery structure according to an embodiment of the present application;

[0015] Figure 3 A side view of a multi-electrode cylindrical soft-pack battery structure according to an embodiment of the present application;

[0016] Figure 4 It is an expanded view of the positive electrode sheet and the negative electrode sheet of the embodiment of the present application;

[0017] Figure 5 For the embodiment of this application Figure 2 Enlarged view of part A.

[0018] Reference numerals

[0019] 10. Winding core; 11. Positive electrode sheet; 12. Negative electrode sheet; 13. Round nickel sheet; 14. Inner electrode ear; 15. Outer electrode ear. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0021] Example

[0022] In order to solve the above technical problems, this embodiment provides a multi-electrode cylindrical soft-pack battery structure, such as Figure 1 As shown, it includes a winding core 10, which is formed by overlapping and winding a positive electrode sheet 11, a separator and a negative electrode sheet 12, and a plurality of inner pole ears 14 integrally formed with the positive electrode sheet 11 and the negative electrode sheet 12 are formed at both ends of the winding core 10, respectively. Circular nickel sheets 13 are arranged at both ends of the winding core 10, and the ends of a plurality of inner pole ears 14 are bent and connected to the top of the circular nickel sheet 13, and an outer pole ear 15 is fixedly arranged on the inner pole ear 14. The winding core 10 is formed by winding the inner pole ear 14, the separator and the outer pole ear 15, and circular nickel sheets 13 are placed at both ends of the winding core 10. Then, by bending the ends of the plurality of inner pole ears 14 formed at both ends of the winding core 10 toward the center of the circular nickel sheet 13, the outer pole ear 15 is fixedly arranged on the inner pole ear 14, so as to realize the application of the multi-pole ear structure of the cylindrical soft-pack battery, avoid the low discharge rate efficiency of the battery during use, ensure the conversion rate of the cylindrical soft-pack battery, and indirectly improve the battery capacity life.

[0023] Specifically, Figure 2 As shown, the ends of several inner pole ears 14 are bent toward the center direction of the circular nickel sheet 13, and the ends of several inner pole ears 14 overlap at the center of the circular nickel sheet 13. By integrally forming several inner pole ears 14 on the positive electrode sheet 11 and the negative electrode sheet 12, when the positive electrode sheet 11 and the negative electrode sheet 12 are wound into a winding core 10, by bending the ends of several inner pole ears 14 to overlap at the center of the circular nickel sheet 13, several inner pole ears 14 are stacked to complete the multi-pole ear structure of the cylindrical soft-pack battery.

[0024] In the above scheme, if Figure 3As shown, a plurality of inner pole ears 14 are formed on one side of the positive electrode sheet 11 and the negative electrode sheet 12. The inner pole ear 14 of the positive electrode sheet 11 is located at one end of the winding core 10, and the inner pole ear 14 of the negative electrode sheet 12 is located at the other end of the winding core 10. By integrally forming a plurality of inner pole ears 14 on the positive electrode sheet 11 and the negative electrode sheet 12, when the positive electrode sheet 11 and the negative electrode sheet 12 are wound into the winding core 10, the inner pole ears 14 on the positive electrode sheet 11 and the negative electrode sheet 12 are respectively located at the two ends of the winding core 10 formed by winding the positive electrode sheet 11 and the negative electrode sheet 12, so that the positive electrode sheet 11 and the negative electrode sheet 12 are wound and form the two poles of the cylindrical soft-pack battery through the inner pole ears 14.

[0025] Further, such as Figure 5 As shown, the width of the inner pole ear 14 is 2-6mm, the thickness of the outer pole ear 15 is 0.15-2mm, the circular nickel sheet 13 is circular, the diameter of the circular nickel sheet 13 is 8-14mm, and the thickness of the circular nickel sheet 13 is 0.2-0.3mm. By way of example, in this embodiment, the width of the inner pole ear 14 can be 2-6mm, and the thickness of the outer pole ear 15 can be 0.15-2mm. When a higher usage rate is required, the thickness of the outer pole ear 15 can be thickened according to actual conditions. The circular nickel sheet 13 is circular, and the diameter of the circular nickel sheet 13 can be 8-14mm. The maximum diameter of the circular nickel sheet 13 is 3mm smaller than the diameter of the core 10, and the minimum diameter is 2mm larger than the diameter of the core 10, and the thickness can be 0.2-0.3mm.

[0026] Specifically, a current collector is formed on the other side of the positive electrode sheet 11 and the negative electrode sheet 12 relative to the inner electrode ear 14, and a coating layer is coated on one side of the current collector surface. The coating layer of the positive electrode sheet 11 is made of lithium cobalt oxide, lithium manganese oxide, nickel cobalt lithium manganese oxide, etc. as main materials, and a conductive agent is added, and a glue is evenly mixed with a solvent NMP to prepare a slurry, which is evenly coated on the current collector. The coating layer of the negative electrode sheet 12 is made of artificial graphite, natural graphite, silicon-based, hard carbon, etc. as main materials, and a conductive agent is added, and a glue is evenly mixed with a solvent water to prepare a slurry, which is evenly coated on the current collector.

[0027] In order to prevent the inner tab from being misaligned during welding, as a preferred embodiment, Figure 4 As shown, the length of the inner pole ear 14 increases along the length direction of the positive electrode sheet 11 and the negative electrode sheet 12. By integrally forming a plurality of inner pole ears 14 on the positive electrode sheet 11 and the negative electrode sheet 12, the length of the inner pole ear 14 increases along the length direction of the positive electrode sheet 11 and the negative electrode sheet 12, so that when the plurality of inner pole ears 14 are bent at both ends of the winding core 10, it is possible to avoid welding errors caused by mismatch of the length of the inner pole ears 14, thereby avoiding welding misalignment on the circular nickel sheet 13 when the inner pole ears 14 are folded.

[0028] In the above scheme, the exposed part of the circular nickel sheet 13 is covered with high-temperature glue for insulation. The exposed part of the inner ear 14 and the circular nickel sheet 13 that does not overlap is coated with high-temperature glue for insulation, thereby preventing the cylindrical soft-pack battery from short-circuiting due to the contact between the circular nickel sheet 13 and the outer aluminum-plastic film during the packaging process.

[0029] Furthermore, the inner pole ear 14 and the outer pole ear 15 are also covered with PI adhesive paper for insulation and fixation. By sticking a layer of PI adhesive paper on the circular nickel sheet 13, the inner pole ear 14 and the outer pole ear 15, the circular nickel sheet 13, the inner pole ear 14 and the outer pole ear 15 can be fixed to each other and prevent the inner pole ear 14 from breaking during the packaging process, thereby achieving insulation and fixation of the inner pole ear 14 and the outer pole ear 15, and preventing the inner pole ear 14 from breaking during the packaging process.

[0030] To summarize, in one or more embodiments of the present application, the present application adopts a winding core, which is formed by winding a positive electrode sheet, a diaphragm and a negative electrode sheet in an overlapping manner, and a plurality of inner pole ears integrally formed with the positive electrode sheet and the negative electrode sheet are formed at both ends of the winding core respectively, and circular nickel sheets are arranged at both ends of the winding core, and the ends of the plurality of inner pole ears are bent and connected to the top of the circular nickel sheet, and an outer pole ear is fixedly arranged on the inner pole ear. The winding core is formed by winding the inner pole ears, the diaphragm and the outer pole ears, and circular nickel sheets are placed at both ends of the winding core, and then the ends of the plurality of inner pole ears formed at both ends of the winding core are bent toward the center of the circular nickel sheet, and then the outer pole ears are fixedly arranged on the inner pole ears, so as to realize the application of a multi-pole ear structure of a cylindrical soft-pack battery, avoid the low discharge rate efficiency of the battery during use, ensure the conversion rate of the cylindrical soft-pack battery, and indirectly improve the battery capacity life.

[0031] The above-described implementation methods do not constitute a limitation on the protection scope of the technical solution. Any modification, equivalent replacement and improvement made within the spirit and principle of the above-described implementation methods shall be included in the protection scope of the technical solution.

Claims

1. A multi-electrode cylindrical soft-pack battery structure, characterized in that: The invention comprises a winding core (10), wherein the winding core (10) is formed by stacking and winding a positive electrode sheet (11), a separator and a negative electrode sheet (12), and a plurality of inner pole ears (14) integrally formed with the positive electrode sheet (11) and the negative electrode sheet (12) are respectively formed at both ends of the winding core (10), and circular nickel sheets (13) are arranged at both ends of the winding core (10), and the ends of a plurality of the inner pole ears (14) are bent and connected to the top of the circular nickel sheet (13), and an outer pole ear (15) is also fixedly arranged on the inner pole ear (14).

2. The multi-electrode cylindrical soft-pack battery structure according to claim 1, characterized in that: The ends of the plurality of inner pole ears (14) are all bent toward the center of the circular nickel sheet (13), and the ends of the plurality of inner pole ears (14) overlap at the center of the circular nickel sheet (13).

3. The multi-electrode cylindrical soft-pack battery structure according to claim 1, characterized in that: A plurality of inner pole ears (14) are formed on one side of the positive electrode sheet (11) and the negative electrode sheet (12); the inner pole ear (14) of the positive electrode sheet (11) is located at one end of the winding core (10), and the inner pole ear (14) of the negative electrode sheet (12) is located at the other end of the winding core (10).

4. The multi-electrode cylindrical soft-pack battery structure according to claim 1, characterized in that: The width of the inner pole ear (14) is 2-6 mm, the thickness of the outer pole ear (15) is 0.15-2 mm, the circular nickel sheet (13) is circular, the diameter of the circular nickel sheet (13) is 8-14 mm, and the thickness of the circular nickel sheet (13) is 0.2-0.3 mm.

5. The multi-electrode cylindrical soft-pack battery structure according to claim 3, characterized in that: A current collector is formed on the other side of the positive electrode sheet (11) and the negative electrode sheet (12) relative to the inner electrode tab (14), and a coating layer is coated on one side of the surface of the current collector.

6. The multi-electrode cylindrical soft-pack battery structure according to claim 5, characterized in that: The length of the inner electrode tab (14) increases gradually along the length direction of the positive electrode sheet (11) and the negative electrode sheet (12).

7. The multi-electrode cylindrical soft-pack battery structure according to claim 2, characterized in that: The exposed part of the circular nickel sheet (13) is covered with high temperature glue for insulation.

8. The multi-electrode cylindrical soft-pack battery structure according to claim 7, characterized in that: The inner pole ear (14) and the outer pole ear (15) are also covered with PI adhesive stickers for insulation and fixation.

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