Pouch cell

Abstract

The application relates to a soft package battery, which comprises a pole core with a first pole lug and a second pole lug with opposite polarities, an upper cover and a lower cover punched by a soft package film, and a hollow cylindrical shell coiled by the soft package film; the soft package film comprises a protective layer, a sealing layer and an intermediate metal layer between the two layers; the inner surface of the shell wall of the cylindrical shell is the sealing layer, the outer surface of the circumferential wall of the upper cover and the outer surface of the circumferential wall of the lower cover are the sealing layer; the sealing layer of the upper cover is connected with the sealing layer of the cylindrical shell, the sealing layer of the lower cover is connected with the sealing layer of the cylindrical shell, and the upper cover, the cylindrical shell and the lower cover form a sealed shell; the pole core is contained in the shell, and the outer end of the first pole lug and the outer end of the second pole lug pass out of the shell. Since the cylindrical shell does not need to be punched, the main body of the package does not generate a demolding angle, the space utilization and the energy density are improved, the cylindrical shell is not limited by the punching depth, a thinner soft package film can be used, and the restriction of the punching depth technology is broken.

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 pouch cells require punching indentations in the aluminum-plastic film to form the upper and lower shells during packaging. The electrode core is then placed within these shells, and the edges of the upper and lower shells are horizontally sealed. The seals are then embossed, and the ends of the horizontal seals are directly pushed and bent, changing the seal from a horizontal direction (along the radial direction of the pouch cell) to a vertical direction (along the axial direction of the pouch cell). A clamping mechanism completes the folding. Existing pouch cells have a certain radius (R) and draft angle after punching, thus sacrificing energy density. This is especially true in the cylindrical pouch cell field, where the cylindrical punching method, due to its small forming area, significantly limits the punching depth. 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 of low energy density caused by the presence of a certain radius and draft angle in existing soft-pack batteries after molding.

[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;

[0006] 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.

[0007] 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 are combined to form a sealed outer shell.

[0008] The electrode core is housed within the outer casing, and the electrode core leads out a first electrode tab and a second electrode tab with opposite polarities. The outer ends of the first electrode tab and the second electrode tab protrude from the outer casing.

[0009] 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.

[0010] 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;

[0011] 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.

[0012] Optionally, the outer end of the first electrode protrudes between the cylindrical peripheral wall of the upper cover and the side wall of the columnar shell, and the outer end of the second electrode protrudes between the cylindrical peripheral wall of the lower cover and the side wall of the columnar shell.

[0013] Optionally, the outer ends of the first electrode and the second electrode both protrude from between the cylindrical peripheral wall of the upper cover and the side wall of the columnar shell.

[0014] 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.

[0015] 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.

[0016] Optionally, the outer end of the first electrode extends through the outer shell via the third sealing edge, and the outer end of the second electrode extends through the outer shell via the fourth sealing edge.

[0017] Optionally, the outer end of the first electrode extends through the fourth sealing edge of the outer shell, and the outer end of the second electrode extends through the sixth sealing edge of the outer shell.

[0018] Optionally, the outer end of the first electrode extends through the outer shell via the third sealing edge, and the outer end of the second electrode extends through the outer shell via the fifth sealing edge.

[0019] 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.

[0020] Compared with the prior art, the soft-pack battery provided by this invention adopts a cylindrical shell with a hollow inner surface as the sealing layer, formed by rolling a soft packaging film into a hollow shell. The upper and lower covers with outer surfaces as sealing layers are then sealed to the sealing layer of the cylindrical shell. This replaces the existing method of forming the upper and lower shells by punching holes in the aluminum-plastic film and then splicing the upper and lower shells into the outer shell of the soft-pack battery. Since there is no need to punch holes in the cylindrical shell, the encapsulated body will not have a draft angle, which improves space utilization and greatly increases energy density. Furthermore, the cylindrical shell is not limited by the depth of the punching, allowing the use of thinner soft packaging film. This breaks the constraints of deep punching technology and can be formed into a soft-pack battery shell of any size. Attached Figure Description

[0021] 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;

[0022] Figure 2 This is an exploded view of the casing of a pouch battery according to an embodiment of the present invention;

[0023] Figure 3 This is a cross-sectional view of a flexible packaging film provided in an embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the structure of a soft-pack battery provided in an embodiment of the present invention, in which the outer end of the first tab protrudes from the first end of the cylindrical shell and the outer end of the second tab protrudes from the second end of the cylindrical shell.

[0025] Figure 5 This is a schematic diagram of the structure of a soft-pack battery provided in an embodiment of the present invention, in which the outer ends of the first tab and the second tab both protrude from the first end of the cylindrical shell.

[0026] Figure 6 This is a schematic diagram of the structure of the top cover with two first sub-caps;

[0027] Figure 7 This is a schematic diagram of the structure of the lower cover with two second sub-covers;

[0028] Figure 8 It has Figure 6 The diagram shows the structure of the soft-pack battery casing without the air bag removed.

[0029] Figure 9 It has Figure 6 The diagram shown illustrates the structure when the outer ends of multiple first electrode tabs protrude from the first end of the columnar shell during the top cover installation.

[0030] Figure 10 This is a schematic diagram of the structure of the top cover with four first sub-caps;

[0031] Figure 11 It has Figure 10 The diagram shown is a structural schematic of the soft-pack battery without the air bag removed when the top cover is on.

[0032] The reference numerals in the accompanying drawings are as follows:

[0033] 11. First pole ear; 12. Second pole ear;

[0034] 21. Protective layer; 22. Sealing layer; 23. Intermediate metal layer;

[0035] 3. Columnar shell;

[0036] 4. Top cover; 41. First sub-cover;

[0037] 5. Lower cover; 51. Second sub-cover;

[0038] 6. First edge seal; 7. Third edge seal; 8. Fourth edge seal; 9. Sixth edge seal; 10. Air bag. Detailed Implementation

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] like Figure 1-7 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.

[0044] 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 have a cylindrical structure. The outer surface of the cylindrical circumferential wall of the upper cover 4 and the outer surface of the cylindrical circumferential wall of the lower cover 5 are sealing layers 22.

[0045] 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 are combined to form a sealed outer shell.

[0046] The electrode core is housed within the outer casing. From the electrode core, a first tab 11 and a second tab 12 of opposite polarity are led out. The outer ends of the first tab 11 and the second tab 12 protrude from the outer casing. The first tab 11 and the second tab 12 are not particularly limited and can be selected according to actual needs; for example, they can be metal strips or sheets made of materials such as gold, platinum, aluminum, or copper. The electrode core is also not particularly limited; it can be a wound core or a stacked cell structure commonly used in this field.

[0047] Compared with the prior art, the soft-pack battery provided by this invention adopts a cylindrical shell 3 with a hollow inner surface and a sealing layer, formed by rolling a soft packaging film into a hollow shell. The upper cover 4 and the lower cover 5, with sealing layers on their outer surfaces, are sealed to the sealing layer of the cylindrical shell 3. This replaces the existing method of forming the upper and lower shells by punching holes in the aluminum-plastic film and then splicing the upper and lower shells into the outer shell of the soft-pack battery. Since there is no need to punch holes in the cylindrical shell 3, the encapsulated body will not have a draft angle, which improves space utilization and greatly increases energy density. Furthermore, the cylindrical shell 3 is not limited by the depth of the punching hole, and a thinner soft packaging film can be used. This breaks the constraints of deep punching technology and can be formed into a soft-pack battery shell of any size.

[0048] 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.

[0049] The cylindrical shell 3, the upper cover 4, and the lower cover 5 can be obtained through the following steps:

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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 forms a second sealing edge (not shown) with the side wall of the cylindrical shell 3. 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.

[0055] In one embodiment, as shown in the figure Figure 4As shown, the outer end of the first tab 11 protrudes between the cylindrical peripheral wall of the upper cover 4 and the side wall of the cylindrical shell 3, and the outer end of the second tab 12 protrudes between the cylindrical peripheral wall of the lower cover 5 and the side wall of the cylindrical shell 3. This allows the outer ends of the first tab 11 and the second tab 12 to exit the outer shell. Specifically, when the outer end of the first tab 11 protrudes between the cylindrical peripheral wall of the upper cover 4 and the side wall 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 immediately. Heat sealing is performed only after the first tab 11 has protruded between the cylindrical peripheral wall of the upper cover 4 and the side wall of the cylindrical shell 3. When the outer end of the second electrode 12 passes through the space between the cylindrical peripheral wall of the lower cover 5 and the side wall 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 sealing edge. The heat sealing is performed after the second electrode 12 passes through the space between the cylindrical peripheral wall of the lower cover 5 and the side wall of the cylindrical shell 3.

[0056] Of course, the outer ends of the first tab 11 and the second tab 12 can also protrude from the side wall of the cylindrical shell 3. When the flexible packaging film is rolled into a cylindrical shell 3, since the sealing layer 22 at one end of the circumferential direction of the flexible packaging film needs to be aligned with the sealing layer 22 at the other end of the circumferential direction, the outer ends of the first tab 11 and the second tab 12 can be protruded from the joint between the sealing layer 22 at one end of the circumferential direction of the flexible packaging film and the sealing layer 22 at the other end of the circumferential direction, and then the joint can be heat-sealed.

[0057] In one embodiment, to increase space utilization and improve the energy density of the pouch 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 and second sealing edges can be embossed. When bending the first sealing edge 6, it can be bent in multiple stages: first, a portion is bent, then another portion is bent after a certain interval, and finally the remaining unbent portion is bent sequentially. Alternatively, notches can be cut at intervals on the first sealing edge 6 before bending it all at once. Similarly, the second sealing edge can be bent in the same way.

[0058] In one embodiment, such as Figure 5 As shown, the outer ends of the first tab 11 and the second tab 12 both protrude from between the cylindrical peripheral wall of the upper cover 4 and the side wall of the cylindrical shell 3. This allows the outer ends of the first tab 11 and the second tab 12 to protrude out of the outer shell. Note that the outer ends of the first tab 11 and the second tab 12 should not be short-circuited.

[0059] In one embodiment, such as Figure 6-11As 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.

[0060] 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.

[0061] In one embodiment, such as Figure 9 As shown, the outer end of the first tab 11 protrudes through the outer casing via the third sealing edge 7, and the outer end of the second tab 12 protrudes through the outer casing via the fourth sealing edge 8. This is to allow the outer ends of the first tab 11 and the second tab 12 to protrude through the outer casing.

[0062] In one embodiment, the outer end of the first tab 11 protrudes through the outer casing via the fourth sealing edge 8, and the outer end of the second tab 12 protrudes through the outer casing via the sixth sealing edge 9. This allows the outer ends of the first tab 11 and the second tab 12 to protrude through the outer casing.

[0063] In one embodiment, the outer end of the first tab 11 protrudes through the outer casing via the third sealing edge 7, and the outer end of the second tab 12 protrudes through the outer casing via the fifth sealing edge. This allows the outer ends of the first tab 11 and the second tab 12 to protrude through the outer casing.

[0064] In one embodiment, 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. When bending the third sealing edge 7, it can be bent in multiple stages: first, a portion is bent, then another portion is bent after a certain interval, and finally the remaining unbent portion is bent sequentially. Alternatively, notches can be cut at intervals on the third sealing edge 7 before bending it all at once. Similarly, the fourth sealing edge 8, the fifth sealing edge, and the sixth sealing edge 9 can all be bent in the same way.

[0065] 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.

[0066] 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 columnar shell has a cylindrical structure, and the upper cover and the lower cover have a cylindrical structure that matches the columnar shell; 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 are combined to form a sealed outer shell. The electrode core is housed within the outer casing, and the electrode core leads out a first electrode tab and a second electrode tab with opposite polarities. The outer ends of the first electrode tab and the second electrode tab protrude from the outer casing.

2. 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.

3. The soft-pack battery according to claim 2, characterized in that, The outer end of the first electrode protrudes between the cylindrical peripheral wall of the upper cover and the side wall of the columnar shell, and the outer end of the second electrode protrudes between the cylindrical peripheral wall of the lower cover and the side wall of the columnar shell.

4. The soft-pack battery according to claim 2, characterized in that, The outer ends of the first electrode and the second electrode both protrude from between the cylindrical peripheral wall of the upper cover and the side wall of the columnar shell.

5. 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.

6. The soft-pack battery according to claim 5, characterized in that, The outer end of the first electrode protrudes through the outer shell via the third sealing edge, and the outer end of the second electrode protrudes through the outer shell via the fourth sealing edge.

7. The soft-pack battery according to claim 5, characterized in that, The outer end of the first electrode protrudes through the outer shell via the fourth sealing edge, and the outer end of the second electrode protrudes through the outer shell via the sixth sealing edge.

8. The soft-pack battery according to claim 5, characterized in that, The outer end of the first electrode protrudes through the outer shell via the third sealing edge, and the outer end of the second electrode protrudes through the outer shell via the fifth sealing edge.

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.

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