Battery processing method and battery

Abstract

The invention is applicable to the field of battery processing, and discloses a battery processing method and a battery, and the battery processing method comprises the following steps: placing lower plastic on one side of a top cover; placing an insulating film on one side, far away from the top cover, of the lower plastic; the pole assembly penetrates through the pole hole of the top cover, and the insulating film and the lower plastic are fixed to the top cover; electrically connecting the battery cell with the pole assembly; and folding the insulating film to form an accommodating cavity surrounding the battery cell. Compared with the traditional scheme of welding the insulating film and the lower plastic, the scheme has the advantages that a boss structure specially used for fixing the insulating film does not need to be arranged on the lower plastic, and the insulating film does not need to be welded and fixed on the peripheral side wall of the lower plastic, so that the overall thickness of the lower plastic can be effectively reduced, and the accommodating cavity can be made larger; and the accommodating cavity can accommodate a larger battery cell, so that the energy density of the battery is improved.

Description

Technical Field

[0001] This invention relates to the field of battery processing, and more particularly to a battery processing method and a battery. Background Technology

[0002] Current new energy battery packs, especially power battery packs, need to have higher energy density to store more energy in a limited space, thereby increasing driving range. Current cell structures mainly consist of the cells themselves (positive plates and materials, negative plates and materials, separators, tabs, etc.) for storing electrical energy, as well as related structural components (top cover, casing, current collectors, MYLAR bags, bottom support plate, etc.). Within the limited external space of the casing, the larger the internal space occupied by the cells, the higher the energy density of the cell space. Therefore, improving the energy density of battery packs is a pressing issue that needs to be addressed. Summary of the Invention

[0003] One object of the present invention is to provide a battery processing method and a battery, which aims to solve the technical problem of low battery energy density.

[0004] To achieve the above objectives, the present invention provides a battery processing method, which includes placing a lower plastic on one side of a top cover; placing an insulating film on the side of the lower plastic away from the top cover; inserting a terminal assembly through a terminal hole in the top cover and fixing the insulating film and the lower plastic on the top cover; electrically connecting the battery cell and the terminal assembly; and folding the insulating film to form a receiving cavity surrounding the battery cell.

[0005] As one implementation, the step of passing the terminal assembly through the terminal hole of the top cover and fixing the insulating film and the lower plastic to the top cover includes: passing the terminal through the terminal hole of the top cover and fixing the lower plastic to the top cover; electrically connecting the busbar and the terminal, wherein the busbar fixes the insulating film to the lower plastic.

[0006] As one implementation, the step of electrically connecting the battery cell and the terminal assembly includes: electrically connecting the battery cell's tab along its thickness direction to the busbar; and placing an insulating sheet at the bend of the tab.

[0007] As one implementation, before the step of placing the insulating sheet at the bend of the electrode tab, the method includes: forming a first part of the plate into a multi-layered stacked structure, and a second part of the plate into a single-layered sheet structure; the step of placing the insulating sheet at the bend of the electrode tab includes: placing the first part at the bend of the electrode tab.

[0008] As one implementation, before the step of placing the insulating sheet at the bend of the electrode tab, the method includes: forming a limiting protrusion or a limiting groove on the insulating sheet; the step of placing the insulating sheet at the bend of the electrode tab includes: placing the insulating sheet at the bend of the electrode tab and engaging the limiting protrusion or limiting groove with the lower plastic limiting part.

[0009] As one implementation, the step of placing the insulating film on the side of the lower plastic away from the top cover includes: placing the top of the insulating film on the side of the lower plastic away from the top cover; the step of folding the insulating film to form a receiving cavity surrounding the battery cell includes: bending the insulating film around the top to form multiple sides, and connecting the multiple sides together so that the sides and the top together form the receiving cavity.

[0010] In one embodiment, before placing the lower plastic on one side of the top cover, the steps include: creating a first step on the top cover; and the steps of passing the electrode assembly through the electrode hole of the top cover and fixing the insulating film and the lower plastic to the top cover, including: passing the electrode through the electrode hole of the top cover and partially overlapping the first step and the side opposite to the first step, so as to fix the lower plastic on the side of the top cover away from the first step.

[0011] In one implementation, the step of creating a first step on the top cover includes: creating a first step and a second step on the top cover, with the second step surrounding the first step; and the step of inserting the electrode post through the electrode post hole of the top cover and partially overlapping the first step and the side opposite to the first step to fix the lower plastic on the side of the top cover away from the first step, which includes: injection molding the upper plastic onto the periphery of the upper skirt of the electrode post; assembling the main body of the electrode post into the electrode post hole; overlapping the upper skirt of the electrode post onto one side of the first step; fixing the lower plastic to the top cover with the lower skirt of the electrode post; and overlapping the upper plastic onto the second step of the top cover.

[0012] As one implementation, before placing the lower plastic on one side of the top cover, the steps include: creating blind holes or through holes on the upper skirt of the pole post; and injection molding the upper plastic onto the periphery of the upper skirt of the pole post, wherein a portion of the upper plastic is accommodated in the blind holes or through holes.

[0013] To achieve the above objectives, the present invention provides a battery, which is manufactured by any of the battery processing methods described above.

[0014] Compared with the prior art, the advantages of this invention are as follows: the insulating film forms a cavity for fixing the battery cell, and the insulating film is further fixed to the side of the lower plastic away from the top cover by the electrode assembly. Compared with the traditional solution of welding the insulating film and the lower plastic, this solution does not require setting a specific boss structure on the lower plastic for fixing the insulating film, nor does it require welding the insulating film to the peripheral wall of the lower plastic. This can effectively reduce the overall thickness of the lower plastic, and thus the cavity can be made larger, which can accommodate a larger battery cell, thereby improving the energy density of the battery. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0016] Figure 1 This is a schematic flowchart of the battery processing method provided in an embodiment of the present invention;

[0017] Figure 2 This is a schematic diagram of the unfolded structure of the battery provided in an embodiment of the present invention;

[0018] Figure 3 This is a schematic diagram showing the unfolded state of the insulating film provided in an embodiment of the present invention;

[0019] Figure 4 This is a three-dimensional schematic diagram of the battery provided in an embodiment of the present invention;

[0020] Figure 5 This is a cross-sectional schematic diagram of the battery provided in an embodiment of the present invention;

[0021] Figure 6 This is provided by the embodiments of the present invention. Figure 5 A magnified view of a portion of region A in the middle;

[0022] Figure 7 This is a three-dimensional schematic diagram of the insulating film provided in an embodiment of the present invention;

[0023] Figure 8 This is a three-dimensional schematic diagram of the isolation sheet provided in an embodiment of the present invention;

[0024] Figure 9 This is a three-dimensional schematic diagram of the top cover provided in an embodiment of the present invention;

[0025] Figure 10 This is a three-dimensional schematic diagram of the pole provided in an embodiment of the present invention.

[0026] Explanation of icon numbers:

[0027] Top cover 10, pole hole 12, first step 14, second step 16, lower plastic 20, pole assembly 30; pole 31, main body 35, upper skirt 36, lower skirt 37, blind hole 38, busbar 32, sealing ring 33; upper plastic 34, insulating film 40, receiving cavity 401, connecting hole 402, side 41, top 42, battery cell 50; battery cell body 52, electrode tab 54, insulating plate 60, limiting groove 601, first part 61, second part 63. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0029] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0030] Please see Figures 1 to 6 , Figure 1 This is a schematic flowchart of the battery processing method provided in an embodiment of the present invention. Figure 2 This is a schematic diagram of the unfolded structure of the battery provided in an embodiment of the present invention. Figure 3 This is a schematic diagram showing the unfolded state of the insulating film provided in an embodiment of the present invention. Figure 4 This is a three-dimensional schematic diagram of the battery provided in an embodiment of the present invention. Figure 5 This is a cross-sectional schematic diagram of the battery provided in an embodiment of the present invention. Figure 6 This is provided by the embodiments of the present invention. Figure 5 A magnified view of a portion of region A in the middle.

[0031] The present invention provides a battery processing method, which includes the following steps.

[0032] S101: Place the lower plastic on one side of the top cover.

[0033] S102: Place the insulating film on the side of the lower plastic away from the top cover.

[0034] S103: Insert the electrode assembly through the electrode hole in the top cover and fix the insulating film and lower plastic to the top cover.

[0035] S104: Electrically connect the battery cell and the terminal assembly.

[0036] S105: Fold the insulating film to form a cavity that surrounds the battery cell.

[0037] Specifically, the battery to be processed in this invention includes a top cover 10, a lower plastic 20, an electrode assembly 30, an insulating film 40, and a battery cell 50.

[0038] A top cover 10 with terminal hole 12 is provided, the terminal hole 12 penetrating through opposite sides of the top cover 10. First, a lower plastic 20 is placed on one side of the top cover 10. The lower plastic 20 can be made of plastic and has insulating properties. Then, an insulating film 40 is placed on the side of the lower plastic 20 away from the top cover 10. The insulating film 40 can also be made of plastic and has insulating properties. Then, a terminal assembly 30 is passed through the terminal hole 12, and the insulating film 40 and the lower plastic 20 are fixed to the top cover 10. The terminal assembly 30 serves to conduct electricity. The insulating film 40 is fixed to the side of the lower plastic 20 away from the top cover 10 through the terminal assembly 30. Then, the battery cell 50 is electrically connected to the terminal assembly 30. Finally, the insulating film 40 is folded to form a receiving cavity 401 surrounding the battery cell. The battery cell 50 is fixed in the receiving cavity 401, and the insulating film 40 has a lifting effect on the battery cell 50.

[0039] In this embodiment, the insulating film 40 is folded to form a receiving cavity 401 for fixing the battery cell 50. The insulating film 40 is further fixed to the side of the lower plastic 20 away from the top cover 10 by the terminal post assembly 30. Compared with the conventional solution of welding the insulating film 40 and the lower plastic 20, this solution does not require setting a specific boss structure on the lower plastic 20 for fixing the insulating film 40, nor does it require welding the insulating film 40 to the peripheral sidewall of the lower plastic 20. This can effectively reduce the overall thickness of the lower plastic 20, and thus the receiving cavity 401 can be made larger. The receiving cavity 401 can accommodate a larger battery cell 50, thereby improving the energy density of the battery.

[0040] In one embodiment, the difference between this embodiment and the previous embodiment is that step S103, which involves inserting the electrode assembly through the electrode hole in the top cover and fixing the insulating film and the lower plastic to the top cover, includes:

[0041] S201: Insert the electrode post through the electrode post hole in the top cover and fix the lower plastic to the top cover;

[0042] S202: Electrically connect the busbar and the terminal post. The busbar fixes the insulating film on the lower plastic.

[0043] Specifically, the battery cell 50 to be processed in this embodiment includes a battery cell body 52 and a tab 54, and the terminal assembly 30 includes a terminal 31 and a busbar 32.

[0044] First, the terminal post 31 is passed through the terminal post hole 12, and the lower plastic 20 is fixed to the top cover 10. The terminal post 31 and the top cover 10 together clamp the lower plastic 20. Then, the busbar 32 and the terminal post 31 are electrically connected. The busbar 32 and the terminal post 31 can be welded together. The insulating film 40 is provided with a connection hole 402 adapted to the terminal post 31, and the diameter of the connection hole 402 is smaller than the outer dimensions of the busbar 32. While the busbar 32 is connected to the terminal post 31, it and the lower plastic 20 together clamp and fix the insulating film 40. That is, the insulating film 40 is fixed to the side of the lower plastic 20 away from the top cover 10 by the busbar 32. One side of the busbar 32 clamps and fixes the insulating film 40 to the lower plastic 20, and the other side of the busbar 32 is electrically connected to the tab 54. In this embodiment, the busbar 32 integrates the tab 54 on the battery cell 50 and also serves to fix the insulating film 40. Without adding new parts, the busbar 32 is reused, which not only eliminates the need for additional parts to fix the insulating film 40, but also eliminates the need for the fixing process of the insulating film 40. The electrode 54 and the cell body 52 are electrically connected.

[0045] Please see Figures 1 to 6 ,as well as Figure 8 , Figure 8 This is a three-dimensional schematic diagram of the isolation sheet 60 provided in an embodiment of the present invention.

[0046] In another embodiment, the difference between this embodiment and the previous embodiment is that, S104: the step of electrically connecting the battery cell and the terminal assembly includes:

[0047] S301: Electrically connect the tabs of the battery cell to the busbar along its thickness direction;

[0048] S302: Place the insulating plate at the bend of the electrode tab.

[0049] Specifically, the battery to be processed in this embodiment also includes a separator 60, a cell 50 including a cell body 52 and a tab 54, and a terminal assembly 30 including a terminal 31 and a busbar 32.

[0050] First, the tab 54 is bent and electrically connected to the busbar 32 along its thickness direction. The bent tab 54 acts as a buffer between the busbar 32 and the battery cell body 52, preventing the tab 54 from being pulled off the busbar 32 during battery cell body 52 movement. Additionally, the bent tab 54 facilitates assembly. Then, an insulating plate 60 is placed at the bend of the tab 54. The insulating plate 60 controls the bending radius of the tab 54 at the bend, reducing the risk of breakage. The bend of the insulating plate 60 facing the tab 54 can be an arc structure to prevent the insulating plate 60 from puncturing the tab 54.

[0051] In another embodiment, the difference between this embodiment and the previous embodiment is that, S302: before and within the step of placing the insulating sheet at the bend of the electrode tab, includes:

[0052] S401: The isolation sheet, consisting of a first part and a second part, is manufactured by integral molding. The first part has a multi-layer structure, and the second part has a single-layer structure.

[0053] S402: The first part is set at the bend of the pole lug.

[0054] Specifically, the isolation sheet 60 to be processed in this embodiment includes a first part 61 and a second part 63 that are integrally connected.

[0055] First, the insulating sheet 60, comprising a first part 61 and a second part 62, is manufactured using a one-piece molding process. The first part 61 has a multi-layer structure, while the second part 62 has a single-layer structure. The one-piece molding process can be either stamping or injection molding. Then, the first part 61 is positioned at the bending point of the electrode tab 54. The first part 61 has a multi-layer structure, while the second part 62 has a single-layer structure. The first part 61 can have a double-layer structure, a triple-layer structure, etc., and this is not limited here. The multi-layer structure of the first part 61 strengthens its structure, preventing the electrode tab 54 from puncturing it.

[0056] In another embodiment, the difference between this embodiment and the previous embodiment is that, S302: before and within the step of placing the insulating sheet at the bend of the electrode tab, includes:

[0057] S501: A limiting protrusion or a limiting groove is formed on the isolation plate.

[0058] S502: The insulating sheet is placed at the bend of the electrode tab, and the limiting protrusion or limiting groove is matched with the lower plastic limiting part.

[0059] First, a limiting protrusion or limiting groove 601 is formed on the insulating plate 60. Then, the insulating plate 60 is positioned at the bend of the electrode tab 54, and the limiting protrusion or limiting groove 601 and the lower plastic 20 are fitted together for limiting. One of the insulating plate 60 and the lower plastic 20 has a limiting protrusion, and the other has a limiting groove 601. The limiting protrusion and the limiting groove 601 cooperate to restrict the movement of the insulating plate 60. Specifically, this includes the following two cases:

[0060] In one case, the isolation plate 60 is provided with a limiting protrusion, and the lower plastic 20 is provided with a limiting groove 601. The limiting protrusion is inserted into the limiting groove 601 to prevent the isolation plate 60 from shaking relative to the lower plastic 20.

[0061] In another case, the isolation plate 60 is provided with a limiting groove 601, and the lower plastic 20 is provided with a limiting protrusion. The limiting protrusion is inserted into the limiting groove 601 to prevent the isolation plate 60 from shaking relative to the lower plastic 20.

[0062] Please see Figures 1 to 7 , Figure 7 This is a three-dimensional schematic diagram of the insulating film 40 provided in an embodiment of the present invention.

[0063] In another embodiment, the difference between this embodiment and the previous embodiment is that the step of placing the insulating film on the side of the lower plastic away from the top cover in S102 includes: S601: placing the top of the insulating film on the side of the lower plastic away from the top cover.

[0064] S105: The step of folding the insulating film to form a receiving cavity surrounding the battery cell includes: S602: bending the insulating film on the top periphery to form a plurality of sides, and connecting the plurality of sides together so that the sides and the top together form a receiving cavity.

[0065] Specifically, the insulating film 40 to be processed in this embodiment includes an integrally connected side portion 41 and a top portion 42, with the side portion 41 disposed on the periphery of the top portion 42.

[0066] First, the top 42 of the insulating film 40 is placed on the side of the lower plastic 20 away from the top cover 10. The top 42 is fixed to the side of the lower plastic 20 away from the top cover 10 by the electrode post assembly 30. The top 42 has a lifting effect on the side portion 41. Then, the insulating film 40 is bent around the top 42 to form multiple side portions 41, and the multiple side portions 41 are connected together. Multiple creases can be preset on the side portions 41 to facilitate the side portions 41 to be folded into a fixed shape according to the preset creases. The multiple side portions 41 are connected to each other and together with the top 42 form a receiving cavity 401. The side portions 41 have a lifting effect on the battery cell 50. The side portions 41 can be stacked at the connection points, and the stacked points are fused together to fix them, thereby improving the connection strength.

[0067] Please see Figures 1 to 6 ,as well as Figure 9 and Figure 10 , Figure 9 This is a perspective view of the top cover 10 provided in an embodiment of the present invention. Figure 10 This is a three-dimensional schematic diagram of the pole post 31 provided in an embodiment of the present invention.

[0068] In another embodiment, the difference between this embodiment and the previous embodiment is that, before the step of placing the lower plastic on one side of the top cover, S101 includes: S701: making a first step on the top cover.

[0069] S103: The step of inserting the electrode assembly through the electrode hole of the top cover and fixing the insulating film and the lower plastic to the top cover includes: S702: inserting the electrode through the electrode hole of the top cover and partially overlapping the first step and the side opposite to the first step, so as to fix the lower plastic to the side of the top cover away from the first step.

[0070] First, a first step 14 is created by forming a terminal hole 12 around the top cover 10. The first step 14 is located on the side of the top cover 10 away from the lower plastic 20, and the first step 14 is recessed relative to the top cover 10. Then, the terminal 31 is inserted through the terminal hole 12 of the top cover 10 and extends partially to the first step 14 and the side opposite to the first step 14. The terminal 31 clamps the opposite two sides of the top cover 10, and the lower plastic 20 is fixed to the side of the top cover 10 away from the first step 14 through the terminal 31. In this embodiment, the first step 14 can partially reduce the thickness of the top cover 10, so that this part of the space can be used to accommodate the terminal 31. The distance between the top surface of the terminal 31 and the top cover 10 is thus reduced, and the space occupied by the terminal 31 above the top cover 10 is reduced, so the battery can be made larger, thereby increasing the energy density of the battery pack.

[0071] In another embodiment, the difference between this embodiment and the previous embodiment is that, S701: the step of making a first step on the top cover includes: S801: making a first step and a second step on the top cover, wherein the second step surrounds the first step.

[0072] S702: The step of inserting the electrode post through the electrode post hole in the top cover and partially overlapping the first step and the side opposite to the first step to fix the lower plastic to the side of the top cover away from the first step includes:

[0073] S802: The upper plastic is molded around the upper skirt of the pole post; S803: The main body of the pole post is assembled into the pole post hole, the upper skirt of the pole post is overlapped on one side of the first step, the lower skirt of the pole post is fixed to the top cover, and the upper plastic is overlapped on the second step of the top cover.

[0074] Specifically, the pole post assembly 30 to be processed in this embodiment also includes an upper plastic 34, and the pole post 31 includes a main body 35, an upper skirt 36 and a lower skirt 37, with the upper skirt 36 and the lower skirt 37 disposed on the peripheral sidewall of the main body 35.

[0075] First, a first step 14 and a second step 16 are made on the top cover. The second step 16 surrounds the first step 14. The second step 16 and the first step 14 are set on the top cover 10 to form a stepped structure.

[0076] Then, the upper plastic 34 is injection molded onto the periphery of the upper skirt 36. This can be done using nano-injection molding or ordinary injection molding. Injection molding improves the connection strength and sealing between the upper plastic 34 and the upper skirt 36, and also reduces the need for additional parts to connect them. The upper plastic 34 is sequentially connected to the upper skirt 36 at the top, side, and bottom, thus enveloping the upper skirt 36 and isolating it from electrical connection with the top cover 10. Furthermore, the upper skirt 36 can have blind holes 38 or through holes. Blind holes 38 do not penetrate the upper skirt 36, while through holes do. Part of the upper plastic 34 is accommodated in the blind holes 38 or through holes, thereby increasing the connection strength between the upper plastic 34 and the upper skirt 36. It is worth noting that with through holes in the upper plastic 34, the upper plastic 34 can penetrate the material connecting the upper and lower sides of the upper skirt 36 to form a whole, resulting in even higher connection strength.

[0077] Then, the main body 35 is assembled into the pole hole 12. The main body 35 is used for conduction. The upper skirt 36 is attached to one side of the first step 14. The lower skirt of the pole is fixed to the lower plastic on the top cover. The lower plastic 20 is fixed to the side of the top cover 10 away from the first step 14 through the lower skirt 37. The upper skirt 36, the main body 35, and the lower skirt 37 form a clamping cavity, which clamps the top cover 10.

[0078] The upper plastic 34 and the upper skirt 36 are connected and overlap the second step 16. The upper skirt 36 is connected to the top cover 10 via the upper plastic 34, thereby insulating the upper skirt 36 from the top cover 10. In this embodiment, the second step 16 can partially reduce the thickness of the top cover 10, thereby allowing this space to be used to accommodate the upper plastic 34. The distance between the top surface of the upper plastic 34 and the top cover 10 is thus reduced, reducing the space occupied by the upper plastic 34 above the top cover 10. This allows the battery to be made larger, thereby increasing the energy density of the battery pack.

[0079] The outer contours of the upper plastic 34, the first step 14, and the second step 16 are all polygonal. The outer contours of the upper plastic 34, the first step 14, and the second step 16 are identical. The polygon shape shown in the attached diagram is hexagonal, but it could also be triangular, quadrilateral, pentagonal, etc. This polygonal structure prevents the upper plastic 34 from wobbling relative to the first step 14 or the second step 16, thereby improving the overall stability of the pole post assembly 30.

[0080] The electrode assembly 30 also includes a sealing ring 33, which can be made of silicone or foam. The sealing ring 33 has a certain degree of deformation capability to achieve a sealing effect. The sealing ring 33 can be placed at the first step 14, and the electrode 31 clamps and fixes the sealing ring 33 at the first step 14, thereby completely sealing the first step 14. Alternatively, the sealing ring 33 can be placed at the connection between the electrode hole 12 and the electrode 31, with the electrode 31 pressing and fixing the sealing ring 33.

[0081] The present invention also provides a battery manufactured by any of the battery processing methods described above.

[0082] It should also be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or may be connected to an intermediary component. When a component is referred to as being "connected to" another component, it can be directly connected to the other component or indirectly connected to the other component through an intermediary component.

[0083] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0084] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A method of processing a battery, characterized by, The method comprises the following steps: placing a lower plastic on one side of a top cover; placing an insulating film on the side of the lower plastic away from the top cover; passing a pole assembly through a pole hole of the top cover and fixing the insulating film and the lower plastic on the top cover; electrically connecting the pole assembly and an electric core; folding the insulating film to form a containing cavity surrounding the electric core.

2. The method according to claim 1, wherein the step of passing the pole assembly through the pole hole of the top cover and fixing the insulating film and the lower plastic on the top cover comprises: passing a pole through the pole hole of the top cover and fixing the lower plastic on the top cover; electrically connecting a busbar and the pole, the busbar fixing the insulating film on the lower plastic.

3. The method according to claim 2, wherein the step of electrically connecting the pole assembly and the electric core comprises: electrically connecting a tab of the electric core along its thickness direction and the busbar; arranging a separation sheet at a bending position of the tab.

4. The method according to claim 3, wherein before the step of arranging the separation sheet at the bending position of the tab, the method comprises: integrally forming a separation sheet comprising a first part and a second part, the first part being a multi-layer structure and the second part being a single-layer structure; the step of arranging the separation sheet at the bending position of the tab comprises: arranging the first part at the bending position of the tab.

5. The method according to claim 3, wherein before the step of arranging the separation sheet at the bending position of the tab, the method comprises: forming a limiting protrusion or a limiting recess on the separation sheet; the step of arranging the separation sheet at the bending position of the tab comprises: arranging the separation sheet at the bending position of the tab and limiting the limiting protrusion or the limiting recess and the lower plastic.

6. The method according to claim 1, wherein the step of placing the insulating film on the side of the lower plastic away from the top cover comprises: placing a top part of the insulating film on the side of the lower plastic away from the top cover; the step of folding the insulating film to form a containing cavity surrounding the electric core comprises: folding the insulating film at a periphery of the top part to form a plurality of side parts, and connecting the plurality of side parts together, so that the side parts and the top part jointly form the containing cavity.

7. The method according to claim 1, wherein before the step of placing the lower plastic on one side of the top cover, the method comprises: forming a first step on the top cover; the step of passing the pole assembly through the pole hole of the top cover and fixing the insulating film and the lower plastic on the top cover comprises: passing the pole through the pole hole of the top cover and partially overlapping the first step and a side opposite to the first step, so as to fix the lower plastic on the side of the top cover away from the first step.

8. The method according to claim 7, wherein the step of forming the first step on the top cover comprises: The first step and the second step are made on the top cover, and the second step is annularly arranged on the first step; The step of inserting the pole post into the pole post hole of the top cover and partially overlapping the first step and the side opposite to the first step to fix the lower plastic on the side of the top cover away from the first step comprises: The upper plastic is injection molded around the upper skirt of the pole post; The main body of the pole post is assembled into the pole post hole, the upper skirt of the pole post is overlapped on the side of the first step, the lower skirt of the pole post fixes the lower plastic on the top cover, and the upper plastic is overlapped on the second step of the top cover.

9. The battery processing method of claim 8, wherein, Before the step of placing the lower plastic on the side of the top cover, it comprises: A blind hole or a through hole is made on the upper skirt of the pole post; The step of injection molding the upper plastic around the upper skirt of the pole post comprises: The upper plastic is injection molded around the upper skirt of the pole post, and part of the upper plastic is accommodated in the blind hole or the through hole.

10. A battery, characterized by The battery is made by the battery processing method of any one of claims 1 to 9.

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