Soft package battery manufacturing process

Abstract

The application relates to a soft package battery manufacturing process, which comprises the following steps: obtaining a pole core with positive and negative pole ears; obtaining a hollow cylindrical shell rolled by a soft packaging film; obtaining an upper cover and a lower cover both made of the soft packaging film; the soft packaging film comprises a protective layer, a sealing layer and an intermediate metal layer arranged between the protective layer and the sealing layer; the inner surface of the shell wall of the cylindrical shell is the sealing layer, the outer surface of the barrel peripheral wall of the upper cover and the outer surface of the barrel peripheral wall of the lower cover are the sealing layer; the pole core is placed in the cylindrical shell; the outer end of the positive pole ear and the outer end of the negative pole ear are led out from the cylindrical shell; the upper cover is arranged at the opening of the first end of the cylindrical shell, the outer surface of the barrel peripheral wall of the upper cover is sealingly connected with the inner surface of the shell wall of the cylindrical shell; the lower cover is arranged at the opening of the second end of the cylindrical shell, the outer surface of the barrel peripheral wall of the lower cover is sealingly connected with the inner surface of the shell wall of the cylindrical shell, the application is not limited by the punching depth, a thinner soft packaging 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 soft-pack battery technology, and in particular relates to a manufacturing process for soft-pack batteries. 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 this invention is to provide a manufacturing process for soft-pack batteries, which addresses the issue of low energy density caused by the presence of certain radius and draft angles after molding.

[0005] To address the aforementioned technical problems, embodiments of the present invention provide a manufacturing process for a pouch cell battery, comprising:

[0006] Obtain an electrode core with positive and negative tabs;

[0007] Obtain a hollow cylindrical shell made of flexible packaging film;

[0008] Obtain an upper cover and a lower cover, both made of 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 shell wall of the columnar shell is the sealing layer, the upper cover and the lower cover have a cylindrical structure, and 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;

[0009] The electrode core is placed into the cylindrical housing;

[0010] The outer ends of the positive electrode tab and the outer ends of the negative electrode tab are passed through the cylindrical shell;

[0011] The top cover is placed over the opening at the first end of the cylindrical shell, and the outer surface of the cylindrical peripheral wall of the top cover is sealed to the inner surface of the shell wall of the cylindrical shell.

[0012] The lower cover is placed over the opening at the second end of the cylindrical shell, and the outer surface of the cylindrical peripheral wall of the lower cover is sealed to the inner surface of the shell wall of the cylindrical shell; the upper cover, the cylindrical shell, and the lower cover together form a sealed outer shell.

[0013] Optionally, obtaining the hollow cylindrical shell rolled from the flexible packaging film specifically includes:

[0014] The flexible packaging film is rolled into a cylindrical shell, so that the sealing layer at one end of the flexible packaging film in the circumferential direction is aligned with the sealing layer at the other end in the circumferential direction.

[0015] The sealing layer at one circumferential end of the flexible packaging film is heat-sealed at the joint with the sealing layer at the other circumferential end.

[0016] Optionally, obtaining the top and bottom covers, both made of flexible packaging film, specifically includes:

[0017] When making the top cover: stamping from the protective layer side of the flexible packaging film toward the sealing layer side of the flexible packaging film, so that the outer surface of the cylindrical circumferential wall of the stamped top cover is the sealing layer, and the inner surface of the cylindrical circumferential wall of the top cover is the protective layer.

[0018] When making the bottom cover: stamping from the protective layer side of the flexible packaging film toward the sealing layer side of the flexible packaging film, so that the outer surface of the cylindrical circumferential wall of the stamped bottom cover is the sealing layer, and the inner surface of the cylindrical circumferential wall of the bottom cover is the protective layer.

[0019] Optionally, when the top cover is placed over the opening at the first end of the columnar shell, 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.

[0020] When the lower cover is placed over the opening at the second end of the columnar shell, the opening end of the lower cover faces the outside of the columnar shell, and the cylindrical peripheral wall of the lower cover forms a second sealing edge with the side wall of the columnar shell.

[0021] Optionally, the first edge sealing is bent and attached to the outer surface of the bottom wall of the upper cover;

[0022] The second edge seal is bent and attached to the outer surface of the bottom wall of the lower cover.

[0023] Optionally, obtaining the top and bottom covers, both made of flexible packaging film, specifically includes:

[0024] Obtain two or more first-point covers;

[0025] Two or more first sub-caps are spliced ​​together to form the top cap, the open end of the top cap faces the outside of the columnar shell, the cylindrical peripheral wall of the top cap and the side wall of the columnar shell form a third sealing edge, and the splicing point between each first sub-cap located inside the top cap forms a fourth sealing edge.

[0026] Obtain two or more second-part covers;

[0027] Two or more second sub-caps are spliced ​​together to form the lower cap, the open end of the lower cap faces the outside of the columnar shell, the cylindrical peripheral wall of the lower cap and the side wall of the columnar shell form a fifth sealing edge, and the splicing point between each second sub-cap located inside the lower cap forms a sixth sealing edge.

[0028] Optionally, the third and fourth sealing edges are bent and attached to the outer surface of the bottom wall of the upper cover; the fifth and sixth sealing edges are bent and attached to the outer surface of the bottom wall of the lower cover.

[0029] Optionally, the step of passing the outer ends of the positive electrode tab and the negative electrode tab out of the cylindrical shell specifically includes: passing the outer ends of both the positive electrode tab and the negative electrode tab out of the first end of the cylindrical shell; or, passing the outer ends of both the positive electrode tab and the negative electrode tab out of the second end of the cylindrical shell.

[0030] Optionally, the step of passing the outer ends of the positive electrode tab and the negative electrode tab out of the cylindrical shell specifically includes: passing the outer end of the positive electrode tab out of the first end of the cylindrical shell and passing the outer end of the negative electrode tab out of the second end of the cylindrical shell.

[0031] Optionally, multiple positive tabs and multiple negative tabs are provided, with the outer ends of the multiple positive tabs connected to form a positive tab network structure and the outer ends of the multiple negative tabs connected to form a negative tab network structure.

[0032] The pouch battery manufacturing process provided in this invention, compared with the prior art, adopts a method of rolling a pouch film into a hollow cylindrical shell with an inner sealing layer, and sealing it with an upper and lower cover with an outer sealing layer. This replaces the existing method of punching holes in an aluminum-plastic film to form an upper and lower shell, and then splicing the upper and lower shells into the pouch battery shell. Since there is no need to punch holes in the cylindrical shell, the encapsulated body will not have a draft angle, improving space utilization and greatly increasing energy density. Furthermore, the cylindrical shell is not limited by the depth of the 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. Attached Figure Description

[0033] Figure 1This 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;

[0034] Figure 2 This is an exploded view of the casing of a pouch battery according to an embodiment of the present invention;

[0035] Figure 3 This is a cross-sectional view of a flexible packaging film provided in an embodiment of the present invention;

[0036] 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 ends of the positive electrode tab and the outer ends of the negative electrode tab both protrude from the first end of the cylindrical shell.

[0037] Figure 5 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;

[0038] Figure 6 It is Figure 5 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;

[0039] Figure 7 This is a schematic diagram of the structure of the top cover with two first sub-caps;

[0040] Figure 8 This is a schematic diagram of the structure of the lower cover with two second sub-covers;

[0041] Figure 9 It has Figure 7 The diagram shows the structure of the soft-pack battery casing without the air bag removed.

[0042] Figure 10 It has Figure 7 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.

[0043] Figure 11 Is adopted Figure 7 The diagram shows a soft-pack battery with a top cover and a positive electrode network structure.

[0044] Figure 12 This is a schematic diagram of the structure of the top cover with four first sub-caps;

[0045] Figure 13 It has Figure 12 The diagram shown is a structural schematic of the soft-pack battery casing without the air bag removed when the top cover is on.

[0046] Figure 14 Is adopted Figure 12 The diagram shows a soft-pack battery with a top cover and a positive electrode network structure.

[0047] The reference numerals in the accompanying drawings are as follows:

[0048] 11. Positive electrode ear; 12. Negative electrode ear;

[0049] 21. Protective layer; 22. Sealing layer; 23. Intermediate metal layer;

[0050] 3. Columnar shell;

[0051] 4. Top cover; 41. First sub-cover;

[0052] 5. Lower cover; 51. Second sub-cover;

[0053] 6. First edge seal; 7. Third edge seal; 8. Fourth edge seal; 9. Sixth edge seal; 10. Air bag. Detailed Implementation

[0054] 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.

[0055] The manufacturing process for a soft-pack battery provided in this invention includes the following steps:

[0056] S10: Obtain an electrode core with a positive tab 11 and a negative tab 12; wherein, the positive tab 11 and the negative tab 12 are not particularly limited and can be selected according to actual needs, such as metal strips or metal sheets made of gold, platinum, aluminum, copper, etc.; the electrode core is not particularly limited, such as the battery core with a wound core or stacked structure commonly used in this field.

[0057] S20: As Figure 1 and Figure 2 As shown, a hollow cylindrical shell 3 is obtained by rolling up a flexible packaging film. Wherein, as... Figure 3 As shown, the flexible 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 rolled hollow cylindrical shell 3 is the sealing layer 22.

[0058] Specifically, step S20, obtaining the hollow cylindrical shell 3 formed by rolling up the flexible packaging film, includes:

[0059] Step S21: Roll the flexible packaging film into a cylindrical shell 3, so that the sealing layer 22 at one end of the flexible packaging film in the circumferential direction is aligned with the sealing layer 22 at the other end in the circumferential direction.

[0060] Step S22: Heat seal the joint between the sealing layer 22 at one circumferential end of the flexible packaging film and the sealing layer 22 at the other circumferential end. A heat sealing machine can be used to heat seal the joint of the cylindrical shell 3.

[0061] S30: Obtain the top cover 4 and bottom cover 5, both made of flexible packaging film; as shown in the example. Figure 2 As shown, the upper cover 4 and the lower cover 5 have a cylindrical structure, and 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. Wherein, as... Figure 2 , Figure 4 , Figure 7 and Figure 12 As shown, the top cover 4 can be one or multiple first sub-covers 41 combined, such as... Figure 2 and Figure 8 As shown, the lower cover 5 can be one or a combination of multiple second covers 51.

[0062] S40: Place the pole core into the cylindrical housing 3.

[0063] S50: The outer ends of the positive electrode tab 11 and the negative electrode tab 12 are passed through the cylindrical shell 3. Specifically, the outer ends of the positive electrode tab 11 and the negative electrode tab 12 are passed through 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 is heat-sealed; or the outer ends of the positive electrode tab 11 and the negative electrode tab 12 are both passed through the first end of the cylindrical shell 3 or both from the second end of the cylindrical shell 3; or the outer end of the positive electrode tab 11 is passed through the first end of the cylindrical shell 3 and the outer end of the negative electrode tab 12 is passed through the second end of the cylindrical shell 3.

[0064] S60: The upper cover 4 is placed over the opening at the first end of the cylindrical shell 3, and the outer surface of the cylindrical peripheral wall of the upper cover 4 is sealed to the inner surface of the shell wall of the cylindrical shell 3. Specifically, a heat sealing machine can be used for heat sealing.

[0065] S70: The lower cover 5 is placed over the opening at the second end of the cylindrical shell 3, and the outer surface of the cylindrical peripheral wall of the lower cover 5 is sealed to the inner surface of the shell wall of the cylindrical shell 3; the upper cover 4, the cylindrical shell 3 and the lower cover 5 together form a sealed outer shell.

[0066] Compared with the prior art, the pouch battery manufacturing process provided by this invention adopts a cylindrical shell 3 with a hollow inner surface of the shell wall and a sealing layer 22, which is formed by rolling a soft packaging film into a hollow shell. The upper cover 4 and the lower cover 5 with the sealing layer 22 on the outer surface are then sealed to the sealing layer 22 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 pouch 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 the space utilization and greatly increases the energy density. Furthermore, the cylindrical shell 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 pouch battery shell of any size.

[0067] In one embodiment, the flexible packaging film can be an aluminum-plastic composite film, wherein the nylon layer of the aluminum-plastic composite film is the protective layer 21, the PP layer of the aluminum-plastic composite film is the sealing layer 22, and the aluminum foil layer of the aluminum-plastic composite film is the intermediate metal layer 23. 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.

[0068] In one embodiment, step S30, namely, obtaining the upper cover 4 and the lower cover 5, both made of flexible packaging film, specifically includes:

[0069] 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.

[0070] 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.

[0071] like Figure 4 As shown, when there is only one top cover 4, in step S60, when the top cover 4 is placed over the opening at the first end of the cylindrical shell 3, the opening end of the top cover 4 faces outward from the cylindrical shell 3, and the cylindrical peripheral wall of the top 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 top cover 4 over the opening at the first end of the cylindrical shell 3. When the electrodes (positive electrode 11, negative electrode 12) need to pass through the opening at the first end of the cylindrical shell 3, the first sealing edge 6 is not heat-sealed first. It is heat-sealed after the electrodes have passed through the cylindrical peripheral wall of the top cover 4 and the side wall of the cylindrical shell 3. By facing the opening end of the top cover 4 outward from the cylindrical shell 3, the first sealing edge 6 can be easily heat-sealed.

[0072] Similarly, when there is only one lower cover 5, in step S70, when the lower cover 5 is placed over the opening at the second end of the cylindrical shell 3, the opening end of the lower cover 5 faces outward from the cylindrical shell 3, and the cylindrical peripheral wall of the lower cover 5 forms a second sealing edge 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 over the opening at the second end of the cylindrical shell 3. When the electrode tabs (positive electrode tab 11, negative electrode tab 12) need to pass through the opening at the second end of the cylindrical shell 3, the second sealing edge is not heat-sealed first. It is heat-sealed after the electrode tabs have passed through the cylindrical peripheral wall of the lower cover 5 and the side wall of the cylindrical shell 3. By facing the opening end of the lower cover 5 outward from the cylindrical shell 3, the second sealing edge can be easily heat-sealed.

[0073] In one embodiment, such as Figure 5 As shown, when there is one upper cover 4 and one lower cover 5, and the outer end of the positive electrode tab 11 protrudes from the first end of the cylindrical shell 3, and the outer end of the negative electrode tab 12 protrudes from the second end of the cylindrical shell 3, multiple positive electrode tabs 11 and multiple negative electrode tabs 12 can be configured. The outer ends of multiple positive electrode tabs 11 are connected together to form a positive electrode tab network structure, and the outer ends of multiple negative electrode tabs 12 are connected together to form a negative electrode tab network structure. The positive and negative electrode tab network structures greatly reduce battery impedance, achieve high-rate charge and discharge characteristics, and the electrode tab structure with a certain strength can replace the steel shell and directly contact the electrical components.

[0074] In one embodiment, such as Figure 6 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.

[0075] In one embodiment, the upper cover 4 is composed of multiple first sub-covers 41, and the lower cover 5 is composed of multiple second sub-covers 51 (e.g., Figure 7 , Figure 8 and Figure 12 When (as shown), step S30, obtaining the upper cover 4 and lower cover 5, both made of flexible packaging film, specifically includes:

[0076] Step S31: Obtain two or more first sub-caps 41.

[0077] Step S32: Join two or more first cover sections 41 together to form a top cover 4. The open end of the top cover 4 faces the outside of the cylindrical shell 3. The cylindrical peripheral wall of the top cover 4 and the side wall of the cylindrical shell 3 form a third sealing edge 7. The joint between each first cover section 41 located inside the top cover 4 forms a fourth sealing edge 8 (e.g., ...). Figure 7 and Figure 9-13(as shown); wherein, the third sealing edge 7 and the fourth sealing edge 8 can be heat-sealed using a heat sealing machine. When the tabs (positive tab 11, negative tab 12) need to protrude from the opening at the first end of the cylindrical shell 3, the tabs can protrude from either the third sealing edge 7 or the fourth sealing edge 8, ensuring that the positive and negative tabs are not short-circuited (as shown). Figure 10 The schematic diagram of the soft-pack battery shown illustrates a structure with two positive tabs 11. Both positive tabs 11 protrude from the opening at the first end of the cylindrical casing 3 (one positive tab 11 protrudes from the third sealing edge 7, and the other positive tab 11 protrudes from the fourth sealing edge 8). When the tab protrudes from the third sealing edge 7, the third sealing edge 7 is not heat-sealed immediately; it is heat-sealed after the tab has protruded from the third sealing edge 7. Similarly, when the tab protrudes from the fourth sealing edge 8, the fourth sealing edge 8 is not heat-sealed immediately; it is heat-sealed after the tab has protruded from the fourth sealing edge 8. By facing the opening end of the top cover 4 towards the outside of the cylindrical casing 3, it is convenient to heat-seal the third sealing edge 7 and the fourth sealing edge 8.

[0078] Step S33: Obtain two or more second cover 51.

[0079] Step S34: Join two or more second cover sections 51 together to form a lower cover 5. The open end of the lower cover 5 faces the outside of the cylindrical shell 3. The cylindrical peripheral wall of the lower cover 5 and the side wall of the cylindrical shell 3 form a fifth sealing edge. The joint between each second cover section 51 located inside the lower cover 5 forms a sixth sealing edge 9 (e.g., ...). Figure 8 (As shown). The fifth and sixth sealing edges 9 can be heat-sealed using a heat-sealing machine. When the tabs (positive tab 11, negative tab 12) need to protrude from the opening at the second end of the cylindrical shell 3, the tabs can protrude from either the fifth sealing edge or the sixth sealing edge 9, ensuring that the positive and negative tabs are not short-circuited. When the tabs protrude from the fifth sealing edge, the fifth sealing edge is not heat-sealed immediately; heat sealing is performed after the tabs have protruded from the fifth sealing edge. Similarly, when the tabs protrude from the sixth sealing edge 9, the sixth sealing edge is not heat-sealed immediately; heat sealing is performed after the tabs have protruded from the sixth sealing edge 9. By facing the opening end of the lower cover 5 towards the outside of the cylindrical shell 3, the fifth and sixth sealing edges 9 can be easily heat-sealed.

[0080] In one embodiment, when the upper cover 4 is composed of multiple first sub-covers 41, and the lower cover 5 is composed of multiple second sub-covers 51, and the outer end of the positive electrode tab 11 protrudes from the first end of the cylindrical shell 3, and the outer end of the negative electrode tab 12 protrudes from the second end of the cylindrical shell 3, multiple positive electrode tabs 11 and multiple negative electrode tabs 12 can be configured, such as... Figure 11 and Figure 14As shown, the outer ends of multiple positive tabs 11 are connected together to form a positive tab network structure, and the outer ends of multiple negative tabs 12 are connected together to form a negative tab network structure. The positive and negative tab network structures greatly reduce battery impedance, enabling 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.

[0081] 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.

[0082] After step S70, that is, the lower cover 5 is placed over the opening at the second end of the cylindrical housing 3, and the outer surface of the cylindrical peripheral wall of the lower cover 5 is sealed to the inner surface of the shell wall of the cylindrical housing 3; after the upper cover 4, the cylindrical housing 3 and the lower cover 5 are assembled to form a sealed outer shell, the manufacturing process of the soft-pack battery further includes:

[0083] Step S80: Connect the positive tab 11 and the negative tab 12 to the positive and negative terminals of the external power supply, respectively, and activate the pouch battery by forming it with the external power supply. The formation adopts the existing formation method, so its more detailed operation steps will not be described here.

[0084] Of course, the pouch battery manufacturing process of the present invention also includes other steps related to the manufacturing of pouch batteries, such as... Figure 1 The steps of cutting off the air bag 10, removing excess scraps, and embossing the edges (first edge, second edge, third edge, fourth edge, fifth edge and sixth edge) can be carried out using existing manufacturing steps, so the present invention will not be elaborated here.

[0085] 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 manufacturing process, characterized by, include: Obtain an electrode core with positive and negative tabs; Obtain a hollow cylindrical shell made of flexible packaging film; Obtain an upper cover and a lower cover, both made of 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 shell wall of the columnar shell is the sealing layer, the upper cover and the lower cover have a cylindrical structure, and 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 electrode core is placed into the cylindrical housing; The outer ends of the positive electrode tab and the outer ends of the negative electrode tab are passed through the cylindrical shell; The top cover is placed over the opening at the first end of the cylindrical shell, and the outer surface of the cylindrical peripheral wall of the top cover is sealed to the inner surface of the shell wall of the cylindrical shell. The lower cover is placed over the opening at the second end of the cylindrical shell, and the outer surface of the cylindrical peripheral wall of the lower cover is sealed to the inner surface of the shell wall of the cylindrical shell; the upper cover, the cylindrical shell, and the lower cover together form a sealed outer shell.

2. The soft-pack battery manufacturing process of claim 1, wherein, The process of obtaining a hollow cylindrical shell made of a flexible packaging film specifically includes: The flexible packaging film is rolled into a cylindrical shell, so that the sealing layer at one end of the flexible packaging film in the circumferential direction is aligned with the sealing layer at the other end in the circumferential direction. The sealing layer at one circumferential end of the flexible packaging film is heat-sealed at the joint with the sealing layer at the other circumferential end.

3. The manufacturing process of the soft-pack battery according to claim 2, characterized in that, The acquisition of the top and bottom covers, both made of flexible packaging film, specifically includes: When making the top cover: stamping from the protective layer side of the flexible packaging film toward the sealing layer side of the flexible packaging film, so that the outer surface of the cylindrical circumferential wall of the stamped top cover is the sealing layer, and the inner surface of the cylindrical circumferential wall of the top cover is the protective layer. When making the bottom cover: stamping from the protective layer side of the flexible packaging film toward the sealing layer side of the flexible packaging film, so that the outer surface of the cylindrical circumferential wall of the stamped bottom cover is the sealing layer, and the inner surface of the cylindrical circumferential wall of the bottom cover is the protective layer.

4. The manufacturing process of the soft-pack battery according to claim 3, characterized in that, When the top cover is placed over the opening at the first end of the columnar shell, 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. When the lower cover is placed over the opening at the second end of the columnar shell, the opening end of the lower cover faces the outside of the columnar shell, and the cylindrical peripheral wall of the lower cover forms a second sealing edge with the side wall of the columnar shell.

5. The manufacturing process of the soft-pack battery according to claim 4, characterized in that, The first edge seal is bent and attached to the outer surface of the bottom wall of the upper cover; The second edge seal is bent and attached to the outer surface of the bottom wall of the lower cover.

6. The manufacturing process of the soft-pack battery according to claim 1, characterized in that, The acquisition of the top and bottom covers, both made of flexible packaging film, specifically includes: Obtain two or more first-point covers; Two or more first sub-caps are spliced ​​together to form the top cap, the open end of the top cap faces the outside of the columnar shell, the cylindrical peripheral wall of the top cap and the side wall of the columnar shell form a third sealing edge, and the splicing point between each first sub-cap located inside the top cap forms a fourth sealing edge. Obtain two or more second-part covers; Two or more second sub-caps are spliced ​​together to form the lower cap, the open end of the lower cap faces the outside of the columnar shell, the cylindrical peripheral wall of the lower cap and the side wall of the columnar shell form a fifth sealing edge, and the splicing point between each second sub-cap located inside the lower cap forms a sixth sealing edge.

7. The manufacturing process of the soft-pack battery according to claim 6, characterized in that, The third and fourth sealing edges are bent and attached to the outer surface of the bottom wall of the upper cover; the fifth and sixth sealing edges are bent and attached to the outer surface of the bottom wall of the lower cover.

8. The manufacturing process of the soft-pack battery according to claim 1, characterized in that, The step of passing the outer ends of the positive electrode tab and the negative electrode tab out of the cylindrical shell specifically includes: passing the outer ends of both the positive electrode tab and the negative electrode tab out of the first end of the cylindrical shell; or, passing the outer ends of both the positive electrode tab and the negative electrode tab out of the second end of the cylindrical shell.

9. The manufacturing process of a soft-pack battery according to claim 1, characterized in that, The step of passing the outer ends of the positive electrode tab and the negative electrode tab out of the cylindrical shell specifically includes: passing the outer end of the positive electrode tab out of the first end of the cylindrical shell, and passing the outer end of the negative electrode tab out of the second end of the cylindrical shell.

10. The manufacturing process of a soft-pack battery according to claim 9, characterized in that, Multiple positive electrodes and multiple negative electrodes are provided. The outer ends of the multiple positive electrodes are connected together to form a positive electrode network structure, and the outer ends of the multiple negative electrodes are connected together to form a negative electrode network structure.

Images