Pouch cell

Abstract

The present application relates to a kind of soft package batteries, including the pole core of multiple positive and negative pole ears, the upper cover and the lower cover punched by soft package film and the hollow cylindrical shell rolled by soft package film;Soft package film includes protective layer, sealing layer and intermediate metal layer between the two;The inner surface of the shell wall of cylindrical shell is sealing layer, the outer surface of the peripheral wall of upper cover and the outer surface of the peripheral wall of lower cover are sealing layer;The sealing layer of upper cover is connected with the sealing layer of cylindrical shell, the sealing layer of lower cover is connected with the sealing layer of cylindrical shell, and upper cover, cylindrical shell and lower cover form sealed shell;Pole core is contained in shell, and the outer end of multiple positive pole ears is from the first end of cylindrical shell and is connected together to form positive pole ear network structure, and the outer end of multiple negative pole ears is from the second end of cylindrical shell and is connected together to form negative pole ear network structure.Positive pole ear network structure and negative pole ear network structure greatly reduce the battery impedance of soft package battery, and realize large ratio charge-discharge characteristics.

Description

Technical Field

[0001] This invention belongs to the field of battery technology, and in particular relates to a soft-pack battery. Background Technology

[0002] Soft-pack batteries have advantages such as good safety performance (unlike steel-cased or aluminum-cased cells that can explode) and light weight.

[0003] Existing cylindrical pouch batteries typically employ a structure with tabs at both ends, one for the positive electrode and the other for the negative electrode. In most cases, there is only one positive and one negative electrode led out from the core. Furthermore, since the outer casing of existing cylindrical pouch batteries is assembled by stamping an upper casing and a lower casing, this structure results in only one tab leading out of the casing. If multiple positive and multiple negative tabs are to be led out from the core, they need to be transferred and soldered inside the battery before being led out from a single tab. This method can lead to overcurrent and heat conduction, and it also limits the number of tabs that can be led out, which is not conducive to high-rate charging and discharging. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a soft-pack battery that addresses the issue that existing soft-pack batteries can only have one positive and one negative tab leading out of the casing, which is not conducive to high-rate charging and discharging.

[0005] To address the aforementioned technical problems, embodiments of the present invention provide a soft-pack battery, comprising an electrode core, an upper cover stamped from a soft packaging film, a lower cover stamped from a soft packaging film, and a hollow cylindrical shell rolled from a soft packaging film; the soft packaging film comprises a protective layer, a sealing layer, and an intermediate metal layer disposed between the protective layer and the sealing layer; The inner surface of the cylindrical shell wall is a sealing layer, and the upper cover and the lower cover have a cylindrical structure. The outer surface of the cylindrical peripheral wall of the upper cover and the outer surface of the cylindrical peripheral wall of the lower cover are sealing layers. The sealing layer of the upper cover is connected to the sealing layer of the columnar shell to seal the opening at the first end of the columnar shell, and the sealing layer of the lower cover is connected to the sealing layer of the columnar shell to seal the opening at the second end of the columnar shell. The upper cover, the columnar shell and the lower cover together form a sealed outer shell. The electrode core is housed within the outer casing. Multiple positive tabs and multiple negative tabs are led out from the electrode core. The outer ends of the multiple positive tabs protrude from the first end of the columnar casing and are connected together to form a positive tab network structure. The outer ends of the multiple negative tabs protrude from the second end of the columnar casing and are connected together to form a negative tab network structure.

[0006] Optionally, the outer ends of the plurality of positive electrodes are connected together by welding, and the outer ends of the plurality of negative electrodes are connected together by welding.

[0007] Optionally, the cylindrical shell has a cylindrical structure, and the upper cover and the lower cover have a cylindrical structure that matches the cylindrical shell.

[0008] Optionally, the open end of the top cover faces the outside of the columnar shell, and the cylindrical peripheral wall of the top cover and the side wall of the columnar shell form a first sealing edge; The opening end of the lower cover faces the outside of the columnar shell, and the cylindrical peripheral wall of the lower cover and the side wall of the columnar shell form a second sealing edge.

[0009] Optionally, the outer ends of the plurality of positive tabs protrude from between the cylindrical peripheral wall of the upper cover and the side wall of the columnar shell, and the outer ends of the plurality of negative tabs protrude from between the cylindrical peripheral wall of the lower cover and the side wall of the columnar shell.

[0010] Optionally, the top cover includes two or more first sub-covers; the two or more first sub-covers are spliced ​​together to form the top cover, the open end of the top cover faces the outside of the columnar shell, the cylindrical peripheral wall of the top cover and the side wall of the columnar shell form a third sealing edge, and the splice between each of the first sub-covers located inside the top cover forms a fourth sealing edge. The lower cover includes two or more second sub-covers; the two or more second sub-covers are spliced ​​together to form the lower cover, the open end of the lower cover faces the outside of the columnar shell, the cylindrical peripheral wall of the lower cover and the side wall of the columnar shell form a fifth sealing edge, and the splice between each second sub-cover located inside the lower cover forms a sixth sealing edge.

[0011] Optionally, the outer ends of the plurality of positive tabs protrude from the splice located inside the upper cover between each of the first sub-covers, and the outer ends of the plurality of negative tabs protrude from the splice located inside the lower cover between each of the second sub-covers.

[0012] Optionally, in all of the positive electrode tabs: the outer ends of a portion of the positive electrode tabs protrude from the joint located inside the upper cover between each of the first sub-covers, and the outer ends of the remaining positive electrode tabs protrude from between the cylindrical peripheral wall of the upper cover and the side wall of the columnar shell; Of all the negative electrode tabs: the outer ends of a portion of the negative electrode tabs protrude from the joint located inside the lower cover between each of the second sub-covers, and the outer ends of the remaining negative electrode tabs protrude from between the cylindrical peripheral wall of the lower cover and the side wall of the columnar shell.

[0013] Optionally, the flexible packaging film is an aluminum-plastic composite film, the protective layer is a nylon layer of the aluminum-plastic composite film, the sealing layer is a PP layer of the aluminum-plastic composite film, and the intermediate metal layer is an aluminum foil layer of the aluminum-plastic composite film.

[0014] Optionally, the electrode core is a wound core, or the electrode core is a cell with a stacked structure.

[0015] The soft-pack battery provided in this invention, compared with the prior art, uses a hollow cylindrical shell formed by an upper cover, a lower cover, and a soft packaging film to form a sealed outer shell. This allows the electrode core, which has multiple positive and multiple negative tabs, housed within the shell to have multiple positive tabs directly protrude from the first end of the cylindrical shell and multiple negative tabs directly protrude from the second end of the cylindrical shell. The outer ends of the protruding positive tabs are connected together to form a positive tab network structure, and the outer ends of the protruding negative tabs are connected together to form a negative tab network structure. The positive and negative tab network structures greatly reduce the battery impedance of the soft-pack battery, preventing overcurrent and heat conduction, and achieving high-rate charge and discharge characteristics. At the same time, the tab structure with a certain strength can replace the steel shell and directly contact the electrical components. Furthermore, since there is no need to punch a dent in the cylindrical shell, the encapsulated body will not have a draft angle, which improves space utilization and greatly increases energy density. In addition, the cylindrical shell is not limited by the depth of the dent, and thinner soft packaging film can be used, breaking the constraints of deep dent technology and enabling the molding of soft pack battery shells of any size. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the outer casing of a soft-pack battery provided in an embodiment of the present invention when the air bag is not removed; Figure 2 This is an exploded view of the casing of a pouch battery according to an embodiment of the present invention; Figure 3 This is a cross-sectional view of a flexible packaging film provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of a soft-pack battery with a positive electrode network structure according to an embodiment of the present invention; Figure 5 It is Figure 4 A schematic diagram of the structure when the first edge is bent and attached to the outer surface of the bottom wall of the top cover; Figure 6 This is a schematic diagram of the structure of the top cover with two first sub-caps; Figure 7 This is a schematic diagram of the structure of the lower cover with two second sub-covers; Figure 8 It has Figure 6 The diagram shows the structure of the soft-pack battery casing without the air bag removed. Figure 9 It has Figure 6 The diagram shown illustrates the structure when the outer ends of multiple positive electrode tabs protrude from the first end of the cylindrical shell during the top cover installation. Figure 10 Is adopted Figure 6 The diagram shows a soft-pack battery with a top cover and a positive electrode network structure. Figure 11 This is a schematic diagram of the structure of the top cover with four first sub-caps; Figure 12 It has Figure 11 The diagram shown is a structural schematic of the soft-pack battery casing without the air bag removed when the top cover is on. Figure 13 Is adopted Figure 11 The diagram shows a soft-pack battery with a top cover and a positive electrode network structure.

[0017] The reference numerals in the accompanying drawings are as follows: 11. Positive electrode ear; 12. Negative electrode ear; 21. Protective layer; 22. Sealing layer; 23. Intermediate metal layer; 3. Columnar shell; 4. Top cover; 41. First sub-cover; 5. Lower cover; 51. Second sub-cover; 6. First edge seal; 7. Third edge seal; 8. Fourth edge seal; 9. Sixth edge seal; 10. Air bag. Detailed Implementation

[0018] To make the technical problems solved, the technical solutions, and the beneficial effects of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention.

[0019] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0020] It should be understood that the terms "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0022] like Figure 1-4 , Figure 9-10 , Figure 12-13 As shown, the soft-pack battery provided in this embodiment of the invention includes an electrode core, an upper cover 4 formed by stamping a soft packaging film, a lower cover 5 formed by stamping a soft packaging film, and a hollow cylindrical shell 3 formed by rolling a soft packaging film; the soft packaging film includes a protective layer 21, a sealing layer 22, and an intermediate metal layer 23 disposed between the protective layer 21 and the sealing layer 22. The inner surface of the shell wall of the columnar shell 3 is a sealing layer 22. The upper cover 4 and the lower cover 5 are cylindrical structures. The outer surface of the cylindrical peripheral wall of the upper cover 4 and the outer surface of the cylindrical peripheral wall of the lower cover 5 are sealing layers 22. The sealing layer of the upper cover 4 is connected to the sealing layer of the columnar shell 3 to seal the opening at the first end of the columnar shell 3, and the sealing layer of the lower cover 5 is connected to the sealing layer of the columnar shell 3 to seal the opening at the second end of the columnar shell 3. The upper cover 4, the columnar shell 3 and the lower cover 5 together form a sealed outer shell. The electrode core is housed within the outer casing. Multiple positive tabs 11 and multiple negative tabs 12 extend from the electrode core. The outer ends of the multiple positive tabs 11 protrude from the first end of the cylindrical casing 3 and are connected together to form a positive tab network structure. The outer ends of the multiple negative tabs 12 protrude from the second end of the cylindrical casing 3 and are connected together to form a negative tab network structure. The positive tabs 11 and negative tabs 12 are not particularly limited and can be selected according to actual needs, such as using metal strips or sheets made of gold, platinum, aluminum, copper, etc. The electrode core is not particularly limited and can be a commonly used wound or stacked cell structure.

[0023] Compared with the prior art, the soft-pack battery provided in this invention uses a sealed outer shell consisting of an upper cover 4, a lower cover 5, and a hollow cylindrical shell 3 made of soft packaging film. This allows the electrode core, which contains multiple positive tabs 11 and multiple negative tabs 12, to directly pass through the first end of the cylindrical shell 3 and the second end of the cylindrical shell 3. The outer ends of the positive tabs 11 and the negative tabs 12 are connected together to form a positive tab network structure, and the outer ends of the negative tabs 12 are connected together to form a negative tab network structure. The positive and negative tab network structures greatly reduce the battery impedance of the soft-pack battery, prevent overcurrent and heat conduction, achieve high-rate charge and discharge characteristics, and the tab structure with a certain strength can replace the steel shell and directly contact the electrical components. Furthermore, since there is no need to punch a dent in the cylindrical shell 3, the encapsulated body will not have a draft angle, which improves space utilization and greatly increases energy density. In addition, the cylindrical shell 3 is not limited by the depth of the dent, and thinner soft packaging film can be used, breaking the constraints of deep dent technology and enabling it to be formed into a soft pack battery shell of any size.

[0024] Preferably, the outer ends of multiple positive tabs 11 are connected together by welding, and the outer ends of multiple negative tabs 12 are connected together by welding. For example, a tab network structure can be formed by soldering. The tab structure (positive tab network structure and negative tab network structure) with a certain strength formed by welding can replace the steel shell and directly contact the electrical components.

[0025] In one embodiment, the cylindrical housing 3 has a cylindrical structure, and the upper cover 4 and lower cover 5 have a cylindrical structure that matches the cylindrical housing 3. Using a cylindrical structure can improve the energy density of the pouch cell.

[0026] The cylindrical shell 3, the upper cover 4, and the lower cover 5 can be obtained through the following steps: When manufacturing the cylindrical shell 3: the flexible packaging film is rolled into a cylindrical shell 3, so that the sealing layer 22 at one end of the flexible packaging film in the circumferential direction is joined with the sealing layer 22 at the other end in the circumferential direction; the joint between the sealing layer 22 at one end of the flexible packaging film in the circumferential direction and the sealing layer 22 at the other end in the circumferential direction is then heat-sealed. A heat-sealing machine can be used to heat-seal the joint of the cylindrical shell 3. Figure 1As shown, an air pocket 10 is formed at the joint of the cylindrical shell 3. After the pouch battery is formed, it is re-encapsulated and then the air pocket 10 is removed. The resulting excess folded edge can be bent and attached to the outer peripheral wall of the cylindrical shell. Because this type of cylindrical shell 3 does not require punching, it does not have a draft angle, improving space utilization and greatly increasing energy density. Furthermore, the cylindrical shell 3 is not limited by the depth of punching, allowing the use of thinner pouch film. This breaks the constraints of deep punching technology and can be formed into pouch battery shells of any size.

[0027] When making the top cover 4: stamping from the protective layer 21 side of the flexible packaging film toward the sealing layer 22 side of the flexible packaging film, so that the outer surface of the cylindrical peripheral wall of the stamped top cover 4 is the sealing layer 22 and the inner surface of the cylindrical peripheral wall of the top cover 4 is the protective layer 21. When making the lower cover 5: stamping from the protective layer 21 side of the flexible packaging film toward the sealing layer 22 side of the flexible packaging film, so that the outer surface of the cylindrical peripheral wall of the stamped lower cover 5 is the sealing layer 22, and the inner surface of the cylindrical peripheral wall of the lower cover 5 is the protective layer 21.

[0028] In one embodiment, such as Figure 4 As shown, the open end of the upper cover 4 faces the outside of the cylindrical shell 3, and the cylindrical peripheral wall of the upper cover 4 and the side wall of the cylindrical shell 3 form a first sealing edge 6. Specifically, the first sealing edge 6 can be heat-sealed by a heat sealing machine to seal the upper cover 4 at the opening of the first end of the cylindrical shell 3. By facing the open end of the upper cover 4 towards the outside of the cylindrical shell 3, the first sealing edge 6 can be easily heat-sealed.

[0029] The opening end of the lower cover 5 faces the outside of the cylindrical shell 3, and the cylindrical peripheral wall of the lower cover 5 and the side wall of the cylindrical shell 3 form a second sealing edge. Specifically, the second sealing edge can be heat-sealed by a heat sealing machine to seal the lower cover 5 at the opening of the second end of the cylindrical shell 3. By facing the opening end of the lower cover 5 towards the outside of the cylindrical shell 3, the second sealing edge can be easily heat-sealed.

[0030] In one embodiment, such as Figure 4As shown, the outer ends of multiple positive tabs 11 protrude from between the cylindrical peripheral wall of the upper cover 4 and the side wall of the cylindrical shell 3, and the outer ends of multiple negative tabs 12 protrude from between the cylindrical peripheral wall of the lower cover 5 and the side wall of the cylindrical shell 3. This facilitates the subsequent formation of a positive tab network structure by the multiple positive tabs 11 and a negative tab network structure by the multiple negative tabs 12. Specifically, when the positive tabs 11 protrude from the opening at the first end of the cylindrical shell 3, the cylindrical peripheral wall of the upper cover 4 and the side wall of the cylindrical shell 3 are not heat-sealed to form the first sealing edge 6. The heat sealing is performed after the positive tabs 11 have protruded from between the cylindrical peripheral wall of the upper cover 4 and the side wall of the cylindrical shell 3. When the negative electrode tab 12 passes through the opening at the second end of the cylindrical shell 3, the cylindrical peripheral wall of the lower cover 5 and the side wall of the cylindrical shell 3 are not heat-sealed to form a second seal. The negative electrode tab 12 is heat-sealed after it passes through the gap between the cylindrical peripheral wall of the lower cover 5 and the side wall of the cylindrical shell 3.

[0031] In one embodiment, such as Figure 5 As shown, in order to increase space utilization and improve the energy density of the soft-pack battery, the first sealing edge 6 is bent and attached to the outer surface of the bottom wall of the upper cover 4; the second sealing edge is bent and attached to the outer surface of the bottom wall of the lower cover 5, and the first sealing edge 6 and the second sealing edge can be embossed.

[0032] In one embodiment, such as Figure 6-13 As shown, the upper cover 4 includes two or more first sub-covers 41; the two or more first sub-covers 41 are spliced ​​together to form the upper cover 4, the open end of the upper cover 4 faces the outside of the columnar shell 3, the cylindrical peripheral wall of the upper cover 4 and the side wall of the columnar shell 3 form a third sealing edge 7, and the splicing part between each first sub-cover 41 located inside the upper cover 4 forms a fourth sealing edge 8; wherein, the third sealing edge 7 and the fourth sealing edge 8 can be heat-sealed by a heat sealing machine, and by facing the open end of the upper cover 4 towards the outside of the columnar shell 3, the third sealing edge 7 and the fourth sealing edge 8 can be conveniently heat-sealed.

[0033] The lower cover 5 includes two or more second sub-covers 51; the two or more second sub-covers 51 are spliced ​​together to form the lower cover 5, the open end of the lower cover 5 faces the outside of the columnar shell 3, the cylindrical peripheral wall of the lower cover 5 and the side wall of the columnar shell 3 form a fifth sealing edge (not shown), and the splice between each second sub-cover 51 located inside the lower cover 5 forms a sixth sealing edge 9; wherein, the fifth sealing edge and the sixth sealing edge 9 can be heat-sealed by a heat sealing machine, and by facing the open end of the lower cover 5 towards the outside of the columnar shell 3, the fifth sealing edge and the sixth sealing edge 9 can be heat-sealed conveniently.

[0034] In one embodiment, the outer ends of the plurality of positive tabs 11 protrude from the joints located within the upper cover 4 between the first sub-covers 41, and the outer ends of the plurality of negative tabs 12 protrude from the joints located within the lower cover 5 between the second sub-covers 51. This facilitates the subsequent formation of a positive tab network structure by the plurality of positive tabs 11 and a negative tab network structure by the plurality of negative tabs 12.

[0035] Of course, such as Figure 13 As shown, the outer ends of the multiple positive tabs 11 can also protrude from between the cylindrical peripheral wall of the upper cover 4 and the side wall of the columnar shell 3, and the outer ends of the multiple negative tabs 12 can also protrude from between the cylindrical peripheral wall of the lower cover 5 and the side wall of the columnar shell 3.

[0036] In one embodiment, such as Figure 9-10 As shown, among all the positive tabs 11: the outer ends of some positive tabs 11 protrude from the splice between each of the first sub-covers 41 located inside the upper cover 4, and the outer ends of the remaining positive tabs 11 protrude from between the cylindrical peripheral wall of the upper cover 4 and the side wall of the columnar shell 3; so as to facilitate the formation of a positive tab network structure by multiple positive tabs 11 in the future.

[0037] In all the negative electrode tabs: the outer ends of some negative electrode tabs 12 protrude from the splice between each of the second sub-covers 51 located inside the lower cover 5, and the outer ends of the remaining negative electrode tabs 12 protrude from between the cylindrical peripheral wall of the lower cover 5 and the side wall of the columnar shell 3, so as to facilitate the formation of a negative electrode tab network structure by multiple negative electrode tabs 12 in the future.

[0038] In one embodiment, in order to increase space utilization and improve the energy density of the pouch battery, the third sealing edge 7 and the fourth sealing edge 8 are bent and attached to the outer surface of the bottom wall of the upper cover 4; the fifth sealing edge and the sixth sealing edge 9 are bent and attached to the outer surface of the bottom wall of the lower cover 5.

[0039] In one embodiment, the flexible packaging film is an aluminum-plastic composite film, the protective layer 21 is a nylon layer of the aluminum-plastic composite film, the sealing layer 22 is a PP layer of the aluminum-plastic composite film, and the intermediate metal layer 23 is an aluminum foil layer of the aluminum-plastic composite film. The aluminum-plastic composite film has good pressure resistance, heat sealing performance and sealing performance, which can effectively prevent battery leakage in the soft-pack button battery and extend the service life of the soft-pack battery.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A soft-pack battery, characterized in that, It includes an electrode core, an upper cover stamped from a flexible packaging film, a lower cover stamped from a flexible packaging film, and a hollow cylindrical shell rolled from a flexible packaging film; the flexible packaging film includes a protective layer, a sealing layer, and an intermediate metal layer disposed between the protective layer and the sealing layer; The inner surface of the cylindrical shell wall is a sealing layer, and the upper cover and the lower cover have a cylindrical structure. The outer surface of the cylindrical peripheral wall of the upper cover and the outer surface of the cylindrical peripheral wall of the lower cover are sealing layers. The sealing layer of the upper cover is connected to the sealing layer of the columnar shell to seal the opening at the first end of the columnar shell, and the sealing layer of the lower cover is connected to the sealing layer of the columnar shell to seal the opening at the second end of the columnar shell. The upper cover, the columnar shell and the lower cover together form a sealed outer shell. The electrode core is housed within the outer casing. Multiple positive tabs and multiple negative tabs are led out from the electrode core. The outer ends of the multiple positive tabs protrude from the first end of the columnar casing and are connected together to form a positive tab network structure. The outer ends of the multiple negative tabs protrude from the second end of the columnar casing and are connected together to form a negative tab network structure.

2. The soft-pack battery according to claim 1, characterized in that, The outer ends of the multiple positive electrode tabs are connected together by welding, and the outer ends of the multiple negative electrode tabs are connected together by welding.

3. The soft-pack battery according to claim 1, characterized in that, The columnar shell has a cylindrical structure, and the upper cover and the lower cover have a cylindrical structure that matches the columnar shell.

4. The soft-pack battery according to claim 1, characterized in that, The opening end of the top cover faces the outside of the columnar shell, and the cylindrical peripheral wall of the top cover and the side wall of the columnar shell form a first sealing edge; The opening end of the lower cover faces the outside of the columnar shell, and the cylindrical peripheral wall of the lower cover and the side wall of the columnar shell form a second sealing edge.

5. The soft-pack battery according to claim 4, characterized in that, The outer ends of the plurality of positive electrode tabs protrude from between the cylindrical peripheral wall of the upper cover and the side wall of the columnar shell, and the outer ends of the plurality of negative electrode tabs protrude from between the cylindrical peripheral wall of the lower cover and the side wall of the columnar shell.

6. The soft-pack battery according to claim 1, characterized in that, The top cover includes two or more first sub-covers; the two or more first sub-covers are spliced ​​together to form the top cover, the open end of the top cover faces the outside of the columnar shell, the cylindrical peripheral wall of the top cover and the side wall of the columnar shell form a third sealing edge, and the splicing part between each first sub-cover located inside the top cover forms a fourth sealing edge. The lower cover includes two or more second sub-covers; the two or more second sub-covers are spliced ​​together to form the lower cover, the open end of the lower cover faces the outside of the columnar shell, the cylindrical peripheral wall of the lower cover and the side wall of the columnar shell form a fifth sealing edge, and the splice between each second sub-cover located inside the lower cover forms a sixth sealing edge.

7. The soft-pack battery according to claim 6, characterized in that, The outer ends of the plurality of positive electrode tabs protrude from the splice located inside the upper cover between each of the first sub-covers, and the outer ends of the plurality of negative electrode tabs protrude from the splice located inside the lower cover between each of the second sub-covers.

8. The soft-pack battery according to claim 6, characterized in that, Of all the positive electrode tabs: a portion of the positive electrode tabs have their outer ends protruding from the joint between each of the first sub-caps located inside the upper cap, and the remaining positive electrode tabs have their outer ends protruding from between the cylindrical peripheral wall of the upper cap and the side wall of the columnar shell; Of all the negative electrode tabs: the outer ends of a portion of the negative electrode tabs protrude from the joint located inside the lower cover between each of the second sub-covers, and the outer ends of the remaining negative electrode tabs protrude from between the cylindrical peripheral wall of the lower cover and the side wall of the columnar shell.

9. The soft-pack battery according to claim 1, characterized in that, The flexible packaging film is an aluminum-plastic composite film, the protective layer is the nylon layer of the aluminum-plastic composite film, the sealing layer is the PP layer of the aluminum-plastic composite film, and the intermediate metal layer is the aluminum foil layer of the aluminum-plastic composite film.

10. The soft-pack battery according to claim 1, characterized in that, The electrode core is a wound core, or the electrode core is a cell with a stacked structure.

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