Current collecting component and battery manufacturing method

Abstract

The present invention belongs to the field of battery technology, and discloses a current collecting component and a battery manufacturing method. Among them, the current collecting component includes a main structure and an extraction structure for extracting current, the main structure is arranged at one end of the length direction of the electrode assembly, the main structure is parallel or approximately parallel to the side of the electrode assembly, and extends along the width direction of the electrode assembly, the main structure is vertically or approximately vertically arranged relative to the extraction structure in the direction away from the cover plate assembly, and at least one end of the width direction of the main structure is provided with a wing structure, the wing structure includes at least two wing blades connected to the main structure, the pole ear is connected to the wing blade, and the wing blade can drive the pole ear to bend toward the side of the main structure away from the electrode assembly. The present invention optimizes the traditional one-piece wing structure into a multi-piece structure, which saves materials and is also easy to bend the wing blades, improves the bending accuracy and bending quality, and is conducive to improving the energy density of the battery.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a current collecting component and a battery manufacturing method. Background Art

[0002] With the increasing development of electric vehicles, higher requirements are placed on the performance of lithium-ion battery cell components that provide energy for them. The electrode assembly needs to uniformly output current through the current collecting component. The main structure of the existing current collecting component is provided with wing structures that can be bent outward and connected to the pole ear part on both sides, but the wing structure of the current collecting component is currently mostly a one-piece design. The wing structure is large and difficult to bend, and the bending accuracy is not high. After bending, it occupies a large space, resulting in an increase in the overall thickness of the current collecting component and the pole ear part, causing the overall length direction of the electrode assembly to become larger, which is not conducive to improving the energy density of the battery. Summary of the invention

[0003] The object of the present invention is to provide a current collecting component and a battery manufacturing method to solve the problem that the wing structure is difficult to bend and the bending accuracy is not high.

[0004] To achieve this object, the present invention adopts the following technical solutions:

[0005] On the one hand, a current collecting component is provided, including a main structure and an extraction structure for extracting current, wherein the main structure is arranged at one end in the length direction of the electrode assembly, the main structure is parallel or approximately parallel to the side surface of the electrode assembly, and extends along the width direction of the electrode assembly, the main structure is vertically or approximately vertically arranged relative to the extraction structure in a direction away from the cover plate assembly, and a wing structure is provided at least at one end in the width direction of the main structure, the wing structure includes at least two wing blades connected to the main structure, and the pole ear portion is connected to the wing blade, and the wing blade can drive the pole ear portion to bend toward the side of the main structure away from the electrode assembly.

[0006] Optionally, the tab portion includes a first tab member and a second tab member that are spaced apart, the wing blades are provided with two, and the first tab member and the second tab member are connected to the two wing blades in a one-to-one correspondence. Compared with the traditional one-piece tab, the two-piece tab is more convenient to bend, improves the bending quality of the tab, and facilitates the bending of the tab, while helping to reduce the consumption of tab materials and save costs.

[0007] Optionally, the electrode assembly is provided with two groups, and the wing structures are respectively provided at both ends of the width direction of the main structure, and the pole ears of the two groups of electrode assemblies are correspondingly connected to the wing structures at both ends of the width direction of the main structure. The pole ears of the two groups of electrode assemblies at the same end share a current collecting component for centralized output, which reduces the number of current collecting components and is conducive to further improving the battery density.

[0008] On the other hand, a battery manufacturing method is provided, using the above-mentioned current collecting member, comprising the following steps:

[0009] A positioning step, positioning and assembling the tooling assembly and the main structure;

[0010] A connecting step, leading the pole ear portion out from one end of the electrode assembly in the length direction and connecting it to the wing blade;

[0011] A bending step is performed to bend the wing blades and the pole ear portion, and to withdraw the tooling assembly.

[0012] Optionally, in the positioning step, a matching portion is provided on the main structure, and the tooling assembly is positioned and assembled with the matching portion. The tooling assembly and the matching portion are assembled and fixed so that the main structure of the current collecting component is not easily bent or twisted when the wing blade is bent, thereby improving the quality of the battery.

[0013] Optionally, in the positioning step, the tool assembly includes a first positioning tool arranged in pairs, the matching portion includes a first matching portion, the first matching portion is arranged at both ends of the width direction of the main structure, one end of the first positioning tool is provided with a first groove structure, and the first matching portion is correspondingly inserted into the first groove structure. The first positioning tool and the first matching portion are inserted into the assembly by groove assembly, which is conducive to improving assembly efficiency.

[0014] In the positioning step, the tool assembly includes a second positioning tool, the matching portion includes a second matching portion disposed at an end of the main structure away from the lead-out structure, and one end of the second positioning tool is provided with a second groove structure that can be plugged and positioned with the second matching portion. The second positioning tool can be plugged and positioned with the second matching portion, which can further improve the positioning effect and prevent the main structure from deflecting.

[0015] Optionally, one of the second matching portion and the second groove structure side wall is provided with a notch, and the other is provided with a protrusion correspondingly, and the protrusion can be engaged with the notch. The engagement of the protrusion with the notch can prevent the second matching portion from shifting left and right after being matched with the second groove structure, thereby ensuring assembly stability.

[0016] Optionally, the tooling assembly includes a third positioning tooling, the matching portion includes a positioning slit opened along the length direction of the main structure, and the third positioning tooling is plugged and assembled with the positioning slit. A positioning slit is opened on the main structure, and the third positioning tooling can be plugged and assembled with the positioning slit, thereby enriching the positioning methods.

[0017] Optionally, in the connecting step, the pole ear portion and the wing blade are fixed by ultrasonic welding. Ultrasonic welding has a fast welding speed and high processing precision, which is conducive to the stable connection of the pole ear portion and the wing blade.

[0018] Beneficial effects of the present invention:

[0019] The wing structure of the current collecting component of the present invention includes at least two wing blades connected to the main structure, and the pole ear of the electrode assembly is connected to and bent with at least two wing blades. The present invention optimizes the traditional one-piece wing structure into a multi-piece structure, and the structural size of each wing blade is relatively small, which saves materials and is easy to bend the wing blade, improves the bending accuracy and bending quality, and is conducive to improving the energy density of the battery.

[0020] The battery manufacturing method of the present invention uses the current collecting component, which is beneficial to improving the manufacturing efficiency and production quality of the battery and saving material costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic structural diagram of a current collecting component according to an embodiment of the present invention;

[0022] Figure 2 is a schematic structural diagram of a current collecting component with a first matching portion according to an embodiment of the present invention;

[0023] Figure 3 is a schematic structural diagram of a first positioning tool according to an embodiment of the present invention;

[0024] Figure 4 is a schematic diagram of assembling the first matching portion and the first positioning tool according to an embodiment of the present invention;

[0025] Figure 5 The structure of the first positioning tool according to the embodiment of the present invention is schematically shown. Figure 2 ;

[0026] Figure 6 Schematic diagram of the assembly of the current collecting component and the first positioning fixture and the second positioning fixture according to the embodiment of the present invention Figure 1 ;

[0027] Figure 7 Schematic diagram of the assembly of the current collecting component and the first positioning fixture and the second positioning fixture according to the embodiment of the present invention Figure 2 ;

[0028] Figure 8 is a schematic diagram of assembling the current collecting component and the third positioning tool according to an embodiment of the present invention;

[0029] Fig. 9 is a schematic diagram of the connection between the current collecting component, the electrode assembly, and the cover plate assembly according to an embodiment of the present invention (the wing blades are not bent);

[0030] Fig.10 It is a bottom view of the connection between the current collecting component, the electrode assembly and the cover plate assembly according to an embodiment of the present invention (the wing blades are not bent);

[0031] Fig.11 yes Fig.10 A schematic diagram of the structure enlargement at the center A;

[0032] Fig.12 It is a schematic diagram of the connection between the current collecting component and the electrode assembly and the cover plate assembly according to an embodiment of the present invention (the wing blades have been bent).

[0033] In the figure:

[0034] 1. Main structure; 11. Matching part; 111. First matching part; 112. Second matching part; 113. Protrusion; 114. Positioning seam;

[0035] 2. Export structure;

[0036] 3. Wing structure; 31. Wing blades;

[0037] 100, electrode assembly; 101, side of electrode assembly; 102, pole ear portion; 1021, first pole ear component; 1022, second pole ear component; 103, cover plate assembly; 1031, pole column;

[0038] 200, tooling assembly; 201, first positioning tooling; 2011, first slot-shaped structure; 202, second positioning tooling; 2021, second slot-shaped structure; 2022, notch; 203, third positioning tooling; 2031, third positioning tooling bottom plate; 2032, T-shaped positioning piece. DETAILED DESCRIPTION

[0039] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar parts or parts having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0040] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection, it can be a mechanical connection or an electrical connection, it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] In the description of the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include the first feature being in direct contact with the second feature, or may include the first feature being in contact with the second feature through another feature between them instead of being in direct contact. Moreover, a first feature being "above", "above" and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0042] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0043] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0044] A current collecting component includes a main structure 1 and an extraction structure 2 for extracting current, the main structure 1 is arranged at one end of the length direction of an electrode assembly 100, the main structure 1 is parallel or approximately parallel to a side surface 101 of the electrode assembly, and extends along the width direction of the electrode assembly 100, the main structure 1 is vertically or approximately vertically arranged relative to the extraction structure 2 in a direction away from a cover plate assembly 103, at least one end of the main structure 1 in the width direction is provided with a wing structure 3, the wing structure 3 includes at least two wing blades 31 connected to the main structure 1, the pole ear portion 102 is connected to the wing blade 31, and the wing blade 31 can drive the pole ear portion 102 to bend toward the side of the main structure 1 away from the electrode assembly 100.

[0045] In this embodiment, Figure 1 and Figure 2 The coordinates are expressed in the length and width directions of the main structure 1. Fig. 9 The middle coordinates represent the length and width directions of the electrode assembly 100. In this embodiment, at least one end of the width direction of the main structure 1 is provided with a wing structure 3, and the wing structure 3 includes at least two wing blades 31 connected to the main structure 1. When in use, the current collecting component is first placed at one end of the length direction of the electrode assembly 100, such as Figure 9-11As shown, the ear portion 102 extends from one end of the electrode assembly 100 in the length direction and is connected and fixed to the wing blade 31. After the fixing is completed, the wing blade 31 is bent so that the wing blade 31 is bent toward the side of the main structure 1 away from the electrode assembly 100 (as shown in FIG. Fig.12 As shown in FIG. 1 , the wing blade 31 has a small structural size, which saves materials and facilitates the bending of the wing blade 31 , thereby improving the bending accuracy and bending quality, and is beneficial to improving the energy density of the battery.

[0046] Optionally, the pole ear portion 102 includes a first pole ear component 1021 and a second pole ear component 1022 that are spaced apart from each other, two wing blades 31 are provided, and the first pole ear component 1021 and the second pole ear component 1022 are connected to the two wing blades 31 in a one-to-one correspondence.

[0047] In this embodiment, if Fig. 9 As shown, in this embodiment, the pole ear portion 102 at one end of each electrode assembly 100 is divided into two independent parts, namely, a first pole ear part 1021 and a second pole ear part 1022. Each group of wing structures 3 includes two wing blades 31, which are respectively connected to the first pole ear part 1021 and the second pole ear part 1022. It can be understood that compared with the one-piece pole ear portion 102, the pole ear portion 102 is divided into two parts, namely, the first pole ear part 1021 and the second pole ear part 1022, in this embodiment. Compared with the traditional one-piece pole ear, the two-piece pole ear is more convenient to bend, which improves the bending quality of the pole ear, facilitates the bending of the pole ear, and helps to reduce the consumption of the pole ear material and save costs.

[0048] Optionally, two groups of electrode assemblies 100 are provided, and wing structures 3 are respectively provided at both ends of the width direction of the main structure 1, and the pole ears 102 of the two groups of electrode assemblies 100 are correspondingly connected to the wing structures 3 at both ends of the width direction of the main structure 1.

[0049] In this embodiment, if Fig. 9 and Fig.10 As shown, two groups of electrode assemblies 100 are provided, and the two groups of electrode assemblies 100 are arranged in the same row and at intervals. The first pole ear member 1021 and the second pole ear member 1022 of each group of electrode assemblies 100 are connected to two wing blades 31 one by one. The pole ear portions 102 at the same end of the two groups of electrode assemblies 100 share a current collecting component for centralized output, which reduces the number of current collecting components set, and is conducive to further improving the battery density. In addition, except for this embodiment Fig. 9 and Fig.10 In addition to the above, the electrode assembly 100 may also be provided with only one group, and the wing structure 3 is also provided with one group accordingly. The first pole ear member 1021 and the second pole ear member 1022 of one group of electrode assemblies 100 are connected to two wing blades 3 in one group of wing structures 3, and the pole ear portion 102 at one end of one group of electrode assemblies 100 is output in a centralized manner through a current collecting component, which is not the case with the attached diagram of this embodiment. Fig. 9 and Fig.10 The connection method of the two groups of electrode assemblies 100 shown is limited.

[0050] Optionally, the wing structure 3 is integrally formed with the main structure 1. In this embodiment, the wing structure 3 is integrally formed with the main structure 1, which is convenient for mass production and helps to improve production efficiency.

[0051] Optionally, the spacing dimension L between two adjacent wing blades 31 is less than or equal to half of the length dimension of the main structure 1. Figure 1 As shown, the spacing dimension L between two adjacent wing blades 31 is less than or equal to half of the length dimension of the main structure 1 , which facilitates the bending of the wing blades 31 .

[0052] Optionally, the thickness of the wing blade 31 is less than or equal to the thickness of the main structure 1. Preferably, the wing blade 31 is thinned so that the thickness of the wing blade 31 is less than the thickness of the main structure 1. It can be understood that after the pole ear portion 102 is connected to the wing blade 31, the wing blade 31 is bent toward the side of the main structure 1 away from the electrode assembly 100, so the wing blade 31 is thinned to further reduce the thickness of the wing blade 31 and the pole ear portion 102 after bending.

[0053] In addition, this embodiment also provides a battery manufacturing method, in which the above-mentioned current collecting component is used, comprising the following steps:

[0054] Positioning step, positioning and assembling the tooling assembly 200 and the main structure 1;

[0055] In this step, the lead-out structure 2 is pre-assembled and connected with the cover plate assembly 103, the cover plate assembly 103 includes poles 1031 disposed at both ends, and the lead-out structure 2 is fixedly connected with the poles 1031. Two groups of electrode assemblies 100 are provided, and the two groups of electrode assemblies 100 are arranged in the same column and at intervals. The main structure 1 is provided with a matching portion 11, and the tooling assembly 200 is positioned and assembled with the matching portion 11 to fix the main structure 1.

[0056] A connecting step, leading the pole ear portion 102 out from one end of the electrode assembly 100 in the length direction and connecting it to the wing blade 31;

[0057] In this step, the pole ear portion 102 includes a first pole ear member 1021 and a second pole ear member 1022 arranged at intervals, and the first pole ear member 1021 and the second pole ear member 1022 are connected to the two wing blades 31 one by one. The connection method of the pole ear portion 102 and the wing blade 31 can be fixed by ultrasonic welding, which has a fast welding speed and high processing accuracy. In addition, connection processes other than laser welding, soldering, etc. can also be used, not limited to those described in this embodiment.

[0058] Bending step: bending the wing blade 31 and the pole ear portion 102 , and withdrawing the tooling assembly 200 .

[0059] In this step, after the connection between the pole ear 102 and the wing blade 31 is completed, the wing blade 31 is bent toward the side of the main structure 1 away from the electrode assembly 100. After the wing blade 31 and the pole ear 102 are bent, the tooling assembly 200 is removed and the processing is completed.

[0060] It is worth noting that, in this embodiment, the positioning and assembly methods of the tooling assembly 200 and the matching portion 11 include but are not limited to the following connection methods:

[0061] Optionally, in the positioning step, as a first preferred connection method, the tooling assembly 200 includes a first positioning tooling 201 arranged in pairs, the mating part 11 includes a first mating part 111, the first mating part 111 is arranged at both ends of the width direction of the main structure 1, and a first groove structure 2011 is arranged at one end of the first positioning tooling 201, and the first mating part 111 is correspondingly inserted into the first groove structure 2011.

[0062] In this embodiment, if Figure 2-Figure 4 As shown, the tooling assembly 200 includes a first positioning tool 201 arranged in pairs, the first positioning tool 201 is L-shaped, and the two first positioning tool 201 are placed at both ends of the width direction of the main structure 1. One end of the first positioning tool 201 is provided with a first groove structure 2011. The first matching portion 111 is located between the gaps of two adjacent wing blades 31, and the local piercing forms an inner convex or outer convex structure. The first groove structure 2011 is correspondingly plugged with the first matching portion 111. In addition, the structure of the first positioning tool 201 can also be as shown in Figure 5 As shown, the first groove structure 2011 and the contact side of the main structure 1 facing away from the electrode assembly side 101 are arranged as a T-shaped surface. Correspondingly, the first matching portion 111 is partially thinned to form an inner convex or outer convex structure similar to the shape of the T-shaped surface, thereby increasing the contact area and improving the assembly accuracy.

[0063] Optionally, in the positioning step, as a second preferred connection method, the tooling assembly 200 includes a second positioning tooling 202, the mating portion 11 includes a second mating portion 112 disposed at an end of the main structure 1 away from the export structure 2, and one end of the second positioning tooling 202 is provided with a second groove structure 2021 that can be plugged and positioned with the second mating portion 112.

[0064] In this embodiment, if Figure 6 and Figure 7As shown, in addition to the first positioning fixture 201 and the first matching portion 111 being positioned and assembled, the second matching portion 112 of the main structure 1 away from the end of the lead-out structure 2 can also be positioned and assembled with the second positioning fixture 202 at the same time, further improving the positioning effect and preventing the main structure 1 from deflecting. The second positioning fixture 202 and the second matching portion 112 also adopt a slot connection form that can be inserted and assembled. The second matching portion 112 is thinned. The second matching portion 112 can be a one-piece type such as Figure 6 As shown or two-piece structure as Figure 7 As shown, the second groove structure 2021 is correspondingly inserted into the second matching portion 112 to position the main structure 1.

[0065] Optionally, in the second matching portion 112 and the side wall of the second groove structure 2021 , one is provided with a notch 2022 , and the other is correspondingly provided with a protrusion 113 , and the protrusion 113 can be engaged with the notch 2022 .

[0066] In this embodiment, if Figure 6 As shown, the second matching portion 112 is provided with a protrusion 113, and the side wall of the second groove structure 2021 is provided with a notch 2022. When the second matching portion 112 and the second groove structure 2021 are inserted and positioned, the protrusion 113 and the notch 2022 are correspondingly engaged, so that the second matching portion 112 and the second groove structure 2021 will not shift left and right after matching, thereby ensuring assembly stability. Figure 7 As shown, a notch 2022 may be provided on the second matching portion 112 , and a protrusion 113 may be provided on the side wall of the second groove structure 2021 , which can also achieve the same effect. This embodiment does not limit the specific location of the protrusion 113 and the notch 2022 .

[0067] Optionally, in the positioning step, as a third preferred connection method, the tooling assembly 200 includes a third positioning tooling 203, the mating portion 11 includes a positioning seam 114 opened along the length direction of the main structure 1, and the third positioning tooling 203 is plugged and assembled with the positioning seam 114.

[0068] In this embodiment, if Figure 8 As shown, a positioning seam 114 can also be provided on the main structure 1, and the third positioning tool 203 is plugged into the positioning seam 114 to complete the positioning. Specifically, the third positioning tool 203 includes a T-shaped positioning piece 2032 and a third positioning tool bottom plate 2031, and a T-shaped positioning piece 2032 is respectively provided at both ends of the length direction of the third positioning tool bottom plate 2031, and the T-shaped positioning piece 2032 can be plugged into and assembled with the positioning seam 114 to achieve rapid positioning of the main structure 1.

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

Claims

1. A current collecting component, comprising a main structure (1) and a lead-out structure (2) for leading out current, wherein the main structure (1) is arranged at one end of an electrode assembly (100) in a length direction, the main structure (1) is parallel or substantially parallel to a side surface (101) of the electrode assembly, and extends along a width direction of the electrode assembly (100), and the main structure (1) is arranged perpendicularly or substantially perpendicularly relative to the lead-out structure (2) in a direction away from a cover plate assembly (103), characterized in that: A wing structure (3) is provided at least at one end of the main structure (1) in the width direction, the wing structure (3) comprising at least two wing blades (31) connected to the main structure (1), the pole ear (102) being connected to the wing blades (31), and the wing blades (31) being capable of driving the pole ear (102) to bend toward a side of the main structure (1) away from the electrode assembly (100); The distance L between two adjacent wing blades (31) is less than or equal to half the length of the main structure (1); the thickness of the wing blade (31) is less than or equal to the thickness of the main structure (1); The pole ear portion (102) comprises a first pole ear component (1021) and a second pole ear component (1022) which are arranged at intervals, two wing blades (31) are provided, and the first pole ear component (1021) and the second pole ear component (1022) are connected to the two wing blades (31) in a one-to-one correspondence.

2. The current collecting component according to claim 1, characterized in that: The electrode assembly (100) is provided in two groups, and the wing structures (3) are respectively provided at both ends of the width direction of the main structure (1), and the pole ear parts (102) of the two groups of the electrode assemblies (100) are correspondingly connected to the wing structures (3) at both ends of the width direction of the main structure (1).

3. A battery manufacturing method, characterized in that: Using the current collecting component according to any one of claims 1 to 2 comprises the following steps: A positioning step, positioning and assembling the tooling assembly (200) and the main structure (1); A connecting step, leading the pole ear portion (102) out from one end of the electrode assembly (100) in the length direction and connecting it to the wing blade (31); A bending step is performed to bend the wing blade (31) and the pole ear portion (102), and to withdraw the tooling assembly (200).

4. The battery manufacturing method according to claim 3, characterized in that: In the positioning step, a matching portion (11) is provided on the main structure (1), and the tooling assembly (200) is positioned and assembled with the matching portion (11).

5. The battery manufacturing method according to claim 4, characterized in that: In the positioning step, the tooling assembly (200) includes a first positioning tooling (201) arranged in pairs, the mating portion (11) includes a first mating portion (111), the first mating portion (111) is arranged at both ends of the main structure (1) in a width direction, and a first groove structure (2011) is arranged at one end of the first positioning tooling (201), and the first mating portion (111) is correspondingly inserted into the first groove structure (2011).

6. The battery manufacturing method according to claim 4 or claim 5, characterized in that: In the positioning step, the tooling assembly (200) includes a second positioning tooling (202), the mating portion (11) includes a second mating portion (112) disposed at one end of the main structure (1) away from the lead-out structure (2), and one end of the second positioning tooling (202) is provided with a second groove structure (2021) capable of being plugged into and positioned with the second mating portion (112).

7. The battery manufacturing method according to claim 6, characterized in that: In the side wall of the second matching portion (112) and the second groove structure (2021), one is provided with a notch (2022), and the other is correspondingly provided with a protrusion (113), and the protrusion (113) can be snap-fitted with the notch (2022).

8. The battery manufacturing method according to claim 4, characterized in that: The tooling assembly (200) comprises a third positioning tooling (203), the matching portion (11) comprises a positioning slit (114) opened along the length direction of the main structure (1), and the third positioning tooling (203) is plug-fitted and assembled with the positioning slit (114).

9. The battery manufacturing method according to claim 4, characterized in that: In the connecting step, the pole ear portion (102) and the wing blade (31) are fixed by ultrasonic welding.

Images