Multi-tab soft package cylindrical battery and preparation method thereof

Abstract

The invention belongs to the technical field of battery production, and discloses a multi-tab soft package cylindrical battery and a preparation method thereof. According to the multi-tab soft package cylindrical battery, a positive electrode connecting part and a negative electrode connecting part are arranged at the two ends of a roll core respectively, the positive electrode connecting part penetrates through and is attached to a first current collecting plate, the negative electrode connecting part penetrates through and is attached to a second current collecting plate, and the first current collecting plate and the second current collecting plate are connected with a first tab and a second tab respectively; and under the condition of ensuring the internal resistance of the battery, the rolling process of the roll core is omitted, metal scraps are prevented from being generated, and the product quality is favorably improved. The positive electrode connecting part is attached to the face, deviating from the main body part, of the first collector plate, and the negative electrode connecting part is attached to the face, deviating from the main body part, of the second collector plate, namely the two ends of the roll core are connected with the outward face of the first collector plate and the outward face of the second collector plate respectively, manual operation is facilitated, production difficulty is lowered, the production process is further simplified, and production efficiency is improved. The production efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of battery production, and in particular to a multi-electrode soft-package cylindrical battery and a preparation method thereof. Background Art

[0002] Soft-pack lithium-ion batteries have the advantages of high mass-to-energy ratio, good safety performance, simple preparation, and low cost, making them widely used in digital, Bluetooth, wearable, heating-not-burning appliances, etc. When the battery cell is working, electrons flow from the positive electrode to the negative electrode, and the flow path is proportional to the internal resistance of the battery cell. The power loss inside the battery cell is proportional to the square of the internal resistance. Therefore, shortening the length of the electron flow path can improve the rate performance of the battery cell.

[0003] In the prior art, a collector plate is welded on the extreme end of a full-ear cylindrical battery cell, and then the ear is welded to the collector plate, thereby achieving the purpose of reducing ohmic impedance. However, the above scheme has high requirements on welding technology, which is prone to cold welding problems, and full-ear requires a flattening process, which is prone to produce metal debris, affecting the product quality of cylindrical batteries.

[0004] Therefore, there is an urgent need for a multi-electrode soft-pack cylindrical battery and a preparation method thereof to solve the above problems. Summary of the invention

[0005] An object of the present invention is to provide a multi-electrode soft-package cylindrical battery that can simplify the production process and improve product quality.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] Provided is a multi-electrode soft-package cylindrical battery, comprising:

[0008] A winding core, the winding core comprising a main body, a positive electrode connecting portion and a negative electrode connecting portion, wherein the positive electrode connecting portion and the negative electrode connecting portion are respectively protruded at two ends of the main body;

[0009] a first current collecting disk, the first current collecting disk covering one end of the main body connected to the positive electrode connecting portion, the first current collecting disk being provided with a first through hole, the positive electrode connecting portion being passed through the first through hole and being attached to a side of the first current collecting disk away from the main body;

[0010] A first electrode tab, the first electrode tab being connected to a side of the first current collecting disk facing away from the main body;

[0011] a second current collecting plate, the second current collecting plate covering one end of the main body connected to the negative electrode connecting portion, the second current collecting plate being provided with a second through hole, the negative electrode connecting portion being passed through the second through hole and being attached to a side of the second current collecting plate away from the main body;

[0012] a second electrode tab, the second electrode tab being connected to a side of the second current collecting disk away from the main body;

[0013] A shell, wherein the winding core, the first current collecting disk and the second current collecting disk are arranged in the shell.

[0014] As an optional solution for a multi-electrode soft-pack cylindrical battery, the winding core is provided with a plurality of the positive electrode connecting parts, the first current collecting disk is provided with a plurality of the first through holes, and each of the positive electrode connecting parts is passed through one of the first through holes and connected to the first current collecting disk.

[0015] As an optional solution for a multi-electrode soft-package cylindrical battery, the winding core is provided with a plurality of the negative electrode connecting parts, and the second current collecting disk is provided with a plurality of the second through holes, and each of the negative electrode connecting parts is passed through a second through hole and connected to the second current collecting disk.

[0016] As an optional solution for a multi-electrode soft-package cylindrical battery, the first current collecting plate includes a first current collector and a first adhesive, and the first adhesive is bonded between the first current collector and the first electrode.

[0017] As an optional solution for a multi-electrode soft-pack cylindrical battery, the first current collector includes a plurality of conductive rings and a plurality of fixing parts, the plurality of conductive rings have different radial dimensions and are concentrically arranged, two adjacent conductive rings are spaced apart, and the plurality of fixing parts extend radially along the conductive rings and are spaced apart in the circumferential direction of the first current collector, and each of the fixing parts is connected to all the conductive rings.

[0018] As an optional solution for the multi-electrode soft-package cylindrical battery, the first adhesive is connected to at least one of the conductive rings.

[0019] As an optional solution for the multi-electrode soft-package cylindrical battery, the second current collecting plate includes a second current collector and a second adhesive, and the second adhesive is bonded between the second current collector and the second electrode.

[0020] As an optional solution for the multi-electrode soft-package cylindrical battery, the positive electrode connecting portion is welded to the first current collecting plate.

[0021] As an optional solution for the multi-electrode soft-package cylindrical battery, the negative electrode connecting portion is welded to the second current collecting plate.

[0022] Another object of the present invention is to provide a method for preparing a multi-electrode soft-package cylindrical battery, which can simplify the production process and improve production efficiency.

[0023] To achieve this object, the present invention adopts the following technical solutions:

[0024] A method for preparing a multi-electrode soft-package cylindrical battery is provided, and the specific steps include:

[0025] S1, rolling the unfolded winding core into a cylindrical state;

[0026] S2, inserting the positive electrode connecting portion into the first through hole so that the first current collecting disk covers the main body, and bending the positive electrode connecting portion and connecting it to the first current collecting disk;

[0027] S3, inserting the negative electrode connecting portion into the second through hole so that the second current collecting plate covers the main body, and bending the negative electrode connecting portion and connecting it to the second current collecting plate;

[0028] S4, connecting the first electrode tab to the first current collecting disk, and connecting the second electrode tab to the second current collecting disk;

[0029] S5, encapsulating the winding core, the first current collecting disk and the second current collecting disk in an aluminum-plastic film and sealing them in the shell.

[0030] Beneficial effects of the present invention:

[0031] The present invention provides a multi-electrode soft-package cylindrical battery, wherein a positive electrode connecting portion and a negative electrode connecting portion are respectively arranged at both ends of a winding core, the positive electrode connecting portion is penetrated and attached to a first current collecting disk, the negative electrode connecting portion is penetrated and attached to a second current collecting disk, the first current collecting disk and the second current collecting disk are respectively connected to a first pole ear and a second pole ear, and under the condition of ensuring the internal resistance of the battery, the process of flattening the winding core is omitted, and the generation of metal debris is avoided, which is beneficial to improving product quality; the positive electrode connecting portion is attached to a side of the first current collecting disk away from the main body, and the negative electrode connecting portion is attached to a side of the second current collecting disk away from the main body, that is, the two ends of the winding core are respectively connected to a side of the first current collecting disk facing outward and a side of the second current collecting disk facing outward, which is convenient for workers to operate, thereby reducing the difficulty of production, simplifying the production process, and being beneficial to improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 Schematic diagram of the unfolded winding core of the multi-electrode soft-package cylindrical battery provided by the present invention;

[0033] Figure 2 It is a schematic diagram of a first embodiment of a first current collecting disk and a first pole lug of a multi-pole soft-package cylindrical battery provided by the present invention;

[0034] Figure 3 2 is a schematic diagram of a second embodiment of a first current collecting plate and a first pole lug of a multi-pole soft-package cylindrical battery provided by the present invention;

[0035] Figure 4It is a schematic diagram of the second current collecting plate of the multi-electrode soft-package cylindrical battery provided by the present invention;

[0036] Figure 5 It is an exploded view of the multi-electrode soft-package cylindrical battery provided by the present invention;

[0037] Figure 6 It is a flow chart of the method for preparing a multi-electrode soft-package cylindrical battery provided by the present invention.

[0038] In the figure:

[0039] 100, winding core; 110, main body; 120, positive electrode connection part; 130, negative electrode connection part;

[0040] 200, first current collecting plate; 210, first through hole; 220, first current collector; 221, conductive ring; 222, fixing part; 230, first adhesive member;

[0041] 300, first pole lug;

[0042] 400, second current collecting plate; 410, second through hole; 420, second current collector; 430, second adhesive member;

[0043] 500, second pole lug;

[0044] 600. Shell. DETAILED DESCRIPTION

[0045] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0046] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0048] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0049] like Figures 1 to 4 As shown, the multi-electrode soft-pack cylindrical battery of this embodiment includes a winding core 100, a first current collecting disc 200, a first pole tab 300, a second current collecting disc 400, a second pole tab 500 and a shell 600. The winding core 100 includes a main body 110, a positive electrode connecting portion 120 and a negative electrode connecting portion 130, and the positive electrode connecting portion 120 and the negative electrode connecting portion 130 are respectively convexly arranged at both ends of the main body 110. The first current collecting disc 200 is covered at one end of the main body 110 connected to the positive electrode connecting portion 120, and the first current collecting disc 200 is provided with a first through hole 210, and the positive electrode connecting portion 120 is penetrated through the first through hole 210 and is attached to a side of the first current collecting disc 200 away from the main body 110, and the first pole tab 300 is connected to a side of the first current collecting disc 200 away from the main body 110. The second current collecting disc 400 is covered on one end of the main body 110 connected to the negative electrode connection part 130. The second current collecting disc 400 is provided with a second through hole 410. The negative electrode connection part 130 is passed through the second through hole 410 and is attached to the side of the second current collecting disc 400 away from the main body 110. The second pole tab 500 is connected to the side of the second current collecting disc 400 away from the main body 110. The winding core 100, the first current collecting disc 200 and the second current collecting disc 400 are arranged in the housing 600.

[0050] Based on the above design, the multi-electrode soft-pack cylindrical battery is provided with a positive electrode connection part 120 and a negative electrode connection part 130 at both ends of the winding core 100, respectively. The positive electrode connection part 120 is passed through and attached to the first current collecting disk 200, and the negative electrode connection part 130 is passed through and attached to the second current collecting disk 400. The first current collecting disk 200 and the second current collecting disk 400 are respectively connected to the first pole ear 300 and the second pole ear 500. While ensuring the internal resistance of the battery, the flattening process of the winding core 100 is omitted, and the generation of metal debris is avoided, which is beneficial to improving product quality, and saves the space occupied by the flattening structure in the shell 600, which is beneficial to controlling the volume and weight of the battery. The positive electrode connection part 120 is attached to the side of the first current collecting disk 200 facing away from the main body 110, and the negative electrode connection part 130 is attached to the side of the second current collecting disk 400 facing away from the main body 110, that is, the two ends of the winding core 100 are respectively connected to the outward side of the first current collecting disk 200 and the outward side of the second current collecting disk 400, which is convenient for workers to operate, thereby reducing production difficulty, simplifying the production process, and helping to improve production efficiency.

[0051] It should be noted that in order to ensure that the positive electrode connection part 120 is firmly connected to the first current collecting disk 200, and the negative electrode connection part 130 is firmly connected to the second current collecting disk 400, in the present embodiment, the positive electrode connection part 120 is welded to the first current collecting disk 200, and the negative electrode connection part 130 is welded to the second current collecting disk 400, thereby ensuring good conductivity between the winding core 100 and the first current collecting disk 200 and the second current collecting disk 400, preventing the internal connection of the battery from being unstable and causing the internal resistance of the battery to increase, thereby ensuring the power performance of the battery.

[0052] Optionally, a plurality of positive electrode connecting portions 120 are disposed at one end of the winding core 100 , and a plurality of first through holes 210 are disposed on the first current collecting disk 200 . Each positive electrode connecting portion 120 passes through a first through hole 210 and is connected to the first current collecting disk 200 .

[0053] Optionally, a plurality of negative electrode connecting portions 130 are disposed at the other end of the winding core 100 , and a plurality of second through holes 410 are disposed on the second current collecting disc 400 . Each negative electrode connecting portion 130 passes through a second through hole 410 and is connected to the second current collecting disc 400 .

[0054] The positive electrode connection part 120 and the negative electrode connection part 130 are both provided in plurality, which can not only ensure the connection strength between the winding core 100 and the first current collecting disk 200, and between the winding core 100 and the second current collecting disk 400, but also increase the contact area between the winding core 100 and the first current collecting disk 200, and between the winding core 100 and the second current collecting disk 400, thereby reducing the internal resistance of the battery, reducing the internal power loss of the battery, and improving the power efficiency of the battery.

[0055] Furthermore, the first current collecting plate 200 further includes a first current collector 220 and a first adhesive 230, and the first adhesive 230 is bonded between the first current collector 220 and the first pole tab 300. By bonding the first current collector 220 to the first pole tab 300, the welding process of the first current collector 220 and the first pole tab 300 in the prior art is replaced, thereby further simplifying the production process of the battery and improving the production efficiency.

[0056] In this embodiment, the first current collector 220 includes a plurality of conductive rings 221 and a plurality of fixing portions 222. The plurality of conductive rings 221 have different radial dimensions and are concentrically arranged. Two adjacent conductive rings 221 are spaced apart. The plurality of fixing portions 222 extend radially along the conductive rings 221 and are spaced apart in the circumferential direction of the first current collector 220. Each fixing portion 222 is connected to all the conductive rings 221, so that two adjacent fixing portions 222 and two adjacent conductive rings 221 can surround and form a first through hole 210. Such an arrangement makes the first current collector 220 simple in structure and easy to produce.

[0057] like Figure 2 and Figure 3 As shown, optionally, the first adhesive 230 is connected to at least one conductive ring 221. In this embodiment, the first adhesive 230 is connected to the outermost conductive ring 221. In some other embodiments, the first adhesive 230 can also be connected to the conductive ring 221 located in the middle of the first current collector 220, so that the position of the first electrode 300 can be adjusted for easy assembly. Of course, the first adhesive 230 can also be bonded to multiple conductive rings 221, thereby improving the connection strength between the first adhesive 230 and the first current collector 220.

[0058] Further, the second current collecting plate 400 includes a second current collector 420 and a second adhesive 430, and the second adhesive 430 is bonded between the second current collector 420 and the second electrode tab 500. The structures of the second current collector 420 and the second adhesive 430 can be set with reference to the first current collector 220 and the first adhesive 230, and will not be repeated here. It can be understood that the second current collector 420 and the first current collector 220 can be set to the same structure, which can further simplify the production process, and will not be repeated here.

[0059] like Figure 5 As shown, this embodiment also provides a method for preparing the above-mentioned multi-electrode soft-package cylindrical battery, and the specific steps include:

[0060] S1, rolling the unfolded roll core 100 into a cylindrical state;

[0061] S2, inserting the positive electrode connection part 120 into the first through hole 210 so that the first current collecting plate 200 covers the main body 110, and bending the positive electrode connection part 120 and connecting it to the first current collecting plate 200;

[0062] S3, inserting the negative electrode connection part 130 into the second through hole 410 so that the second current collecting plate 400 covers the main body 110, and bending the negative electrode connection part 130 and connecting it to the second current collecting plate 400;

[0063] S4, connecting the first electrode tab 300 to the first current collecting disk 200, and connecting the second electrode tab 500 to the second current collecting disk 400;

[0064] S5 , encapsulating the winding core 100 , the first current collecting disc 200 and the second current collecting disc 400 in an aluminum-plastic film and sealing them in a housing 600 , with the first pole tab 300 and the second pole tab 500 extending out of the housing 600 .

[0065] The method for preparing a multi-electrode soft-package cylindrical battery provided in this embodiment can eliminate the flattening process of the core 100, simplify the connection process between the core 100 and the first current collecting disk 200 and the core 100 and the second current collecting disk 400, and improve production efficiency.

[0066] Specifically, in step S2 , the positive electrode connecting portion 120 is bent and connected to the first current collecting plate 200 by welding to ensure the connection strength between the positive electrode connecting portion 120 and the first current collecting plate 200 .

[0067] Specifically, in step S3 , the negative electrode connecting portion 130 is bent and then welded to the second current collecting plate 400 , thereby ensuring the connection strength between the negative electrode connecting portion 130 and the second current collecting plate 400 .

[0068] In step S4, the first adhesive 230 is folded and covered on the first current collector 220, one side of the first adhesive 230 is bonded to the first current collector 220, and the first pole tab 300 is bonded to the other side of the first adhesive 230; the second adhesive 430 is folded and covered on the second current collector 420, one side of the second adhesive 430 is bonded to the second current collector 420, and the second pole tab 500 is bonded to the other side of the second adhesive 430. Using bonding instead of welding can further simplify the production process, improve production efficiency, avoid welding defects, and improve product quality.

[0069] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A multi-electrode soft-pack cylindrical battery, characterized in that: include: A winding core (100), the winding core (100) comprising a main body (110), a positive electrode connecting portion (120) and a negative electrode connecting portion (130), wherein the positive electrode connecting portion (120) and the negative electrode connecting portion (130) are respectively protrudingly arranged at two ends of the main body (110); a first current collecting disk (200), the first current collecting disk (200) being covered on one end of the main body (110) connected to the positive electrode connecting portion (120), the first current collecting disk (200) being provided with a first through hole (210), the positive electrode connecting portion (120) being passed through the first through hole (210) and being attached to a side of the first current collecting disk (200) facing away from the main body (110); A first pole lug (300), the first pole lug (300) being connected to a side of the first current collecting plate (200) facing away from the main body (110); a second current collecting disk (400), the second current collecting disk (400) being covered on one end of the main body (110) connected to the negative electrode connecting portion (130), the second current collecting disk (400) being provided with a second through hole (410), the negative electrode connecting portion (130) being passed through the second through hole (410) and being attached to a side of the second current collecting disk (400) facing away from the main body (110); A second pole lug (500), the second pole lug (500) being connected to a side of the second current collecting plate (400) facing away from the main body (110); A shell (600), wherein the winding core (100), the first current collecting plate (200) and the second current collecting plate (400) are arranged in the shell (600).

2. The multi-electrode soft-package cylindrical battery according to claim 1, characterized in that: The winding core (100) is provided with a plurality of the positive electrode connecting parts (120), the first current collecting disk (200) is provided with a plurality of the first through holes (210), and each of the positive electrode connecting parts (120) is passed through one of the first through holes (210) and is connected to the first current collecting disk (200).

3. The multi-electrode soft-package cylindrical battery according to claim 1, characterized in that: The winding core (100) is provided with a plurality of the negative electrode connecting parts (130), the second current collecting disk (400) is provided with a plurality of the second through holes (410), and each of the negative electrode connecting parts (130) is passed through one of the second through holes (410) and is connected to the second current collecting disk (400).

4. The multi-electrode soft-package cylindrical battery according to claim 1, characterized in that: The first current collecting plate (200) comprises a first current collector (220) and a first adhesive member (230), wherein the first adhesive member (230) is bonded between the first current collector (220) and the first electrode tab (300).

5. The multi-electrode soft-package cylindrical battery according to claim 4, characterized in that: The first current collector (220) comprises a plurality of conductive rings (221) and a plurality of fixing portions (222); the plurality of conductive rings (221) have different radial dimensions and are concentrically arranged; two adjacent conductive rings (221) are arranged at intervals; the plurality of fixing portions (222) extend radially along the conductive rings (221) and are arranged at intervals in the circumferential direction of the first current collector (220); and each fixing portion (222) is connected to all the conductive rings (221).

6. The multi-electrode soft-package cylindrical battery according to claim 5, characterized in that: The first adhesive member (230) is connected to at least one of the conductive rings (221).

7. The multi-electrode soft-package cylindrical battery according to claim 1, characterized in that: The second current collecting plate (400) comprises a second current collector (420) and a second adhesive member (430), wherein the second adhesive member (430) is bonded between the second current collector (420) and the second electrode tab (500).

8. The multi-electrode soft-package cylindrical battery according to claim 1, characterized in that: The positive electrode connecting portion (120) is connected to the first current collecting plate (200) by welding.

9. The multi-electrode soft-package cylindrical battery according to claim 1, characterized in that: The negative electrode connecting portion (130) is connected to the second current collecting plate (400) by welding.

10. A method for preparing a multi-electrode soft-package cylindrical battery according to any one of claims 1 to 9, characterized in that: The specific steps include: S1, rolling the winding core (100) in an unfolded state into a cylindrical state; S2, inserting the positive electrode connection part (120) into the first through hole (210), so that the first current collecting plate (200) covers the main body (110), and bending the positive electrode connection part (120) and connecting it to the first current collecting plate (200); S3, inserting the negative electrode connection part (130) into the second through hole (410), so that the second current collecting plate (400) is covered on the main body (110), and bending the negative electrode connection part (130) and connecting it to the second current collecting plate (400); S4, connecting the first electrode tab (300) to the first current collecting disk (200), and connecting the second electrode tab (500) to the second current collecting disk (400); S5. Encapsulate the winding core (100), the first current collecting disk (200), and the second current collecting disk (400) in an aluminum-plastic film and seal them in the housing (600).

Images