Collecting component and positioning device

Abstract

The utility model provides a current collecting component and a positioning device, the current collecting component comprises a connecting plate, the connecting plate comprises a main body part and connecting parts arranged at one end of the main body part along a first direction, the connecting parts are arranged in pairs, and the two connecting parts are arranged at intervals along a second direction perpendicular to the first direction to form a notch; one side of the main body part along the third direction is used for arranging a pole; the welding piece is arranged on the other side, in the third direction, of the connecting part, the surface, in the second direction, of the welding piece is used for being connected with the tab, and the first direction, the second direction and the third direction are perpendicular to one another. According to the current collecting component provided by the invention, the problem that the tab sinks due to the fact that the tab needs to be bent in the assembly process of the secondary battery in the prior art is solved, and the current collecting component can be conveniently matched with a positioning device to realize welding positioning, so that stable welding of the current collecting component and the tab is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a current collecting component and a positioning device. Background Art

[0002] Secondary batteries are currently widely used in electric vehicles, energy storage systems, and other fields due to their relatively light weight and high energy density. In the prior art, the tabs of the electrode assembly inside a secondary battery are typically connected to the pole via a current collecting member. When a secondary battery includes two electrode assemblies, the specific connection process typically involves placing the two electrode assemblies flat on either side of the current collecting member, welding the tabs to the lower surface of the current collecting member, and then welding the current collecting member to the pole. After completing the above welding, the two electrode assemblies need to be joined together, that is, the tabs of the two electrode assemblies are bent so that the two electrode assemblies fit together. During the joining process, the tabs are susceptible to stress and can easily sink, causing the electrode assembly to short-circuit and fail. Based on this, the prior art has a solution that places the electrode assembly upright and welds the tabs to the sides of the current collecting member. However, when using this solution, how to position the current collecting member to ensure the stability of the welding between the tabs and the current collecting member is an urgent problem that needs to be solved. Utility Model Content

[0003] The main purpose of the utility model is to provide a current collecting component and a positioning device, so as to solve the problem of the tab sinking caused by the bending of the tab during the assembly of the secondary battery in the prior art and realize stable welding of the tab and the current collecting component.

[0004] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a current collecting component is provided, including: a connecting plate, the connecting plate includes a main body and a connecting portion arranged at one end of the main body along a first direction, the connecting portions are arranged in pairs, and the two connecting portions are spaced apart to form a notch along a second direction perpendicular to the first direction; one side of the main body along the third direction is used to set the pole; a welding piece, the welding piece is arranged on the other side of the connecting portion along the third direction, each connecting portion is provided with a welding piece, and the surface of the welding piece in the second direction is used to connect to the pole ear, and the first direction, the second direction and the third direction are perpendicular to each other.

[0005] Furthermore, the length of the welding piece along the first direction is smaller than the length of the connecting portion along the first direction, and the welding piece is spaced apart from the main body portion along the first direction.

[0006] Furthermore, the connecting plate further includes an abutting portion, and along the first direction, the abutting portion is located at an end of the connecting portion away from the main body portion.

[0007] Furthermore, the length of the abutting portion along the first direction is not less than 3 mm.

[0008] According to another aspect of the present invention, a positioning device is provided, including a first tooling, the first tooling having: a first placement groove, along a first direction, the first placement groove is arranged at at least one end of the first tooling, the first placement groove is for placing the main body, and the first placement groove is provided with an opening on one side along the first direction, the opening is used for the connecting part to pass through; a positioning plate, located on one side of the opening of the first placement groove, the positioning plate is used to clamp with the notch between the two connecting parts.

[0009] Furthermore, the positioning plate is partially located in the first placement groove, and along the second direction, a second placement groove for limiting the connecting part is formed between the positioning plate and the groove wall of the first placement groove; and / or, the first tooling has a pair of supporting plates, the two supporting plates are spaced apart from the first placement groove along the first direction, and the two supporting plates are respectively located on both sides of the positioning plate along the second direction, and the supporting plates are used to place the abutting part of the connecting plate.

[0010] Furthermore, the first tooling is provided with a first placement groove at both ends along the first direction, the positioning plate is located between the two first placement grooves, the two end faces of the positioning plate along the first direction are respectively used to cooperate with the two first placement grooves to limit the main body of the two current collecting components, and the two ends of the positioning plate along the first direction are respectively used to clamp with the notches of the two current collecting components.

[0011] Furthermore, the first tooling includes mounting plates arranged in pairs, the mounting plates including a first plate section and a second plate section connected to each other, the first placement groove being arranged on the first plate section, and the two second plate sections being detachably connected; a positioning plate, along the third direction, the positioning plate being arranged on a side of the mounting plate having the first placement groove, and along the second direction, the second plate section is detachably provided with supporting plates on both sides of one end away from the first plate section, and the supporting plates are used to place the abutting portion of the connecting plate; a connecting piece, the connecting piece is used for detachable connection between the positioning plate and the mounting plate.

[0012] Furthermore, the positioning device also includes a second tooling, which includes: a base plate for placing the electrode assembly; a plurality of columns, which are fixedly connected to the base plate, and the first tooling is arranged on the side of the plurality of columns away from the base plate.

[0013] Furthermore, a positioning groove is provided on a side of each column facing away from the bottom plate, and at least a portion of the first tool is placed in the positioning groove.

[0014] The application of the technical solution of the utility model achieves the following technical effects:

[0015] Since the welding piece welded to the pole ear is arranged at a vertical connection portion, the pole ear and the welding piece are connected along the surface of the second direction, so during the welding process, the electrode assembly can be directly placed upright and welded to the current collecting component. After the pole ear and the welding piece are welded, there is no need to bend the pole ear again. The pole ear is only subjected to vertical tension, which avoids the risk of the pole ear sinking and being inserted upside down into the pole piece, causing short circuit failure of the electrode assembly, and is convenient for cooperating with the positioning device to achieve welding positioning, thereby achieving stable welding of the current collecting component and the pole ear. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting part of this application are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0017] Figure 1 Shows a schematic structural diagram of the current collecting component of the utility model;

[0018] Figure 2 Shows a schematic structural diagram of the first tooling of the utility model;

[0019] Figure 3 Shows a schematic structural diagram of one of the mounting plates of the present invention;

[0020] Figure 4 Shows a structural schematic diagram of another mounting plate of the utility model;

[0021] Figure 5 Shows a schematic structural diagram of the second tooling of the utility model;

[0022] Figure 6 It shows a schematic structural diagram of the cooperation between the first tooling and the current collecting component of the utility model;

[0023] Figure 7 A schematic structural diagram of the cooperation between the first tooling, the second tooling, the electrode assembly and the current collecting component of the present invention is shown.

[0024] The above drawings include the following reference numerals:

[0025] 10. Connecting plate; 11. Main body; 12. Connecting portion; 13. Abutting portion; 20. Pole; 21. Boss; 22. Sealing ring; 30. Welding piece; 40. First tooling; 41. Mounting plate; 411. First plate section; 412. Second plate section; 413. Load-bearing plate; 42. Positioning plate; 43. Connecting piece; 44. First placement groove; 45. Second placement groove; 46. Protrusion; 47. Groove; 50. Second tooling; 51. Bottom plate; 52. Column; 521. Positioning groove. DETAILED DESCRIPTION

[0026] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0027] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0028] In the present invention, unless otherwise specified, directional words such as "up, down, top, bottom" are usually used with reference to the directions shown in the drawings, or with reference to the components themselves in the vertical, perpendicular or gravity direction; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above directional words are not used to limit the present invention.

[0029] The main purpose of the utility model is to provide a current collecting component and a positioning device, so as to solve the problem of the tab sinking caused by the bending of the tab during the assembly of the secondary battery in the prior art and realize stable welding of the tab and the current collecting component.

[0030] See also Figure 1 A current collecting component includes: a connecting plate 10 and a welding piece 30, the connecting plate 10 includes a main body 11 and a connecting portion 12 arranged at one end of the main body 11 along a first direction, the connecting portions 12 are arranged in pairs, and the two connecting portions 12 are spaced apart to form a notch along a second direction perpendicular to the first direction; one side of the main body 11 along the third direction is used to set the pole 20; the welding piece 30 is arranged on the other side of the connecting portion 12 along the third direction, and each connecting portion 12 is provided with a welding piece 30, and the surface of the welding piece 30 in the second direction is used to connect with the pole ear, and the first direction, the second direction and the third direction are perpendicular to each other.

[0031] Since the welding piece 30 welded to the tab is arranged perpendicular to the connecting portion 12, the tab and the welding piece 30 are connected on the surface in the second direction. Therefore, during the welding process, the electrode assembly can be directly placed upright and welded to the current collecting component. After the tab is welded to the welding piece 30, there is no need to bend the tab again. The tab is only subjected to vertical tension, avoiding the risk of the tab sinking and being inserted upside down into the tab, causing short circuit failure of the electrode assembly.

[0032] The current collecting component is used to connect the tabs of one or more electrode assemblies, enabling multiple electrode assemblies to be connected in parallel or series. In this embodiment, the current collecting component connects to two electrode assemblies, so it is connected to the tabs of the two electrode assemblies via two paired welding tabs 30. The connecting plate 10 is a plate-like structure, with a main body 11 for mounting the electrode column 20 and remaining horizontal with the surface of the electrode assembly; the connecting portion 12 is connected to the welding tab 30, which is arranged perpendicular to the connecting plate 10. The tabs of the electrode assemblies extend from the surface of the electrode assembly and are parallel to the welding tab 30, facilitating welding of the tabs. The gap formed between the two connecting portions 12 is used to cooperate with the positioning device to facilitate positioning of the current collecting component during the subsequent welding process, thereby achieving stable welding between the current collecting component and the tabs.

[0033] In the figure, the X direction is the first direction, the Y direction is the second direction, and the Z direction is the third direction.

[0034] In this embodiment, the pole 20 can be directly welded to the surface of the main body 11, or a through hole can be opened on the main body 11, and the boss below the pole 20 passes through the through hole and is seam welded to the main body 11; in addition, the pole 20 can also be integrally formed with the main body 11; further, the pole 20 includes a plurality of circular bosses stacked in sequence, and the diameter of the boss decreases in the direction away from the protrusion of the pole 20. The pole 20 serves as the output pole of the battery, and by providing a circular boss, it is convenient to cooperate with other external parts. At the same time, the pole 20 is composed of a plurality of circular bosses of different diameters stacked together to meet the matching requirements of different parts.

[0035] In one embodiment, a sealing ring 22 is sleeved on the bottom end of each circular boss; the sealing ring 22 can play a sealing role and improve the connection effect between the boss and external parts.

[0036] See also Figure 1 The welding sheet 30 has a welding area and a vacant area, and the vacant area is arranged around the welding area.

[0037] The welding area on the welding sheet 30 is used for welding to the electrode tab of the electrode assembly, and a vacant area is provided to accommodate the positional deviation that may occur between the electrode tab and the welding sheet 30 during the welding process, or the positional deviation of the weld mark. When a deviation occurs during the welding process, it will be welded to the vacant area without causing damage to other structures.

[0038] In this embodiment, the length of the welding tab 30 along the first direction is less than the length of the connecting portion 12 along the first direction, and the welding tab 30 is spaced apart from the main body 11 along the first direction. Because the welding tab 30 is spaced apart from the main body 11, the connecting portion 12 therebetween can be used to engage with the positioning device for position limiting, thereby improving the limiting effect on the current collecting component.

[0039] In this embodiment, the connecting plate 10 further includes an abutting portion 13 . Along the first direction, the abutting portion 13 is located at an end of the connecting portion 12 away from the main body 11 .

[0040] During the positioning process before welding, the abutting portion 13 is used to abut against the positioning device and cooperate with the positioning device for positioning. The abutting portion 13 cooperates with the positioning tool to facilitate positioning of the current collecting component.

[0041] In a preferred solution, the extension direction of the abutting portion 13 is not less than 3 mm. When the length of the abutting portion 13 is less than 3 mm, the corresponding positioning effect cannot be achieved, so the minimum length of the abutting portion 13 needs to be limited.

[0042] See also Figure 2 、 Figure 3 、 Figure 4 and Figure 6 A positioning device includes a first tooling 40, and the first tooling 40 has: a first placement groove 44 and a positioning plate 42. Along the first direction, the first placement groove 44 is set at at least one end of the first tooling 40, and the first placement groove 44 is for placing the main body 11. The first placement groove 44 is provided with an opening on one side along the first direction, and the opening is used for the connection part 12 to pass through; on the side where the opening of the first placement groove 44 is provided, the positioning plate 42 is used to engage with the notch between the two connection parts 12.

[0043] To improve welding accuracy, during the pre-welding positioning process, both the first fixture 40 and the electrode assembly must be placed in a preset position. The electrode assembly and the first fixture 40 are temporarily secured. The current collecting component is then placed onto the first fixture 40. During placement, the main body 11 of the current collecting component is placed into the first placement groove 44, with the notch of the connecting portion 12 engaging the positioning plate 42. The welding tab 30 then extends away from the first placement groove 44 to the bottom of the first fixture, thereby completing the positioning of the current collecting component. The current collecting component fits perfectly with the positioning device, improving positioning accuracy. During welding, when the current collecting component is subjected to force from the welding fixture, the current collecting component's position will not shift, thereby improving the stability of the welding between the tab and the current collecting component.

[0044] In this embodiment, the positioning plate 42 is partially located in the first placement groove 44 . Along the second direction, a second placement groove 45 for limiting the connection portion 12 is formed between the positioning plate 42 and the groove wall of the first placement groove 44 .

[0045] The second placement groove 45 is for placing the end of the connecting part 12 close to the main body 11 (i.e., the part between the welding piece 30 and the main body 11). The second placement groove 45 between the positioning plate 42 and the groove wall of the first placement groove 44 facilitates the limiting of the connecting part 12.

[0046] In another embodiment, the first tooling 40 has supporting plates 413 arranged in pairs, the two supporting plates 413 and the first placement groove 44 are spaced apart along the first direction, and the two supporting plates 413 are respectively located on both sides of the positioning plate 42 along the second direction, and the supporting plates 413 are used to place the abutment portion 13 of the connecting plate 10.

[0047] By separately providing a supporting plate 413 to support and limit the abutting portion 13 of the current collecting component away from the main body 11, the current collecting component can be better supported and positioned, and the end of the connecting portion 12 away from the main body 11 can be prevented from sinking.

[0048] In this embodiment, the first tooling 40 is provided with a first placement groove 44 at both ends along the first direction, and the positioning plate 42 is located between the two first placement grooves 44. The two end faces of the positioning plate 42 along the first direction are respectively used to cooperate with the two first placement grooves 44 to limit the main body 11 of the two current collecting components, and the two ends of the positioning plate 42 along the first direction are respectively used to clamp with the notches of the two current collecting components.

[0049] Since electrode assemblies typically have positive and negative tabs, corresponding positive and negative current collecting members are required. When the positive and negative tabs of an electrode assembly are located on the same side, the first fixture 40 in this embodiment can simultaneously position both the positive and negative current collecting members. Specifically, two current collecting members are used in conjunction with a single positioning device. The main bodies 11 of the two current collecting members are respectively positioned in the two first placement slots 44 at the ends of the first fixture 40, and the connecting portions 12 of the two current collecting members are respectively engaged with the ends of the positioning plates 42. This allows a single first fixture 40 to simultaneously position a pair of current collecting members, thereby improving efficiency.

[0050] In this embodiment, the first tooling 40 includes a mounting plate 41, a positioning plate 42, and a connector 43, which are arranged in pairs. The mounting plate 41 includes a first plate segment 411 and a second plate segment 412, which are connected to each other. A first placement groove 44 is provided on the first plate segment 411, and the two second plate segments 412 are detachably connected. Along the third direction, the positioning plate 42 is provided on the side of the mounting plate 41 having the first placement groove 44. Along the second direction, a supporting plate 413 is detachably provided on both sides of the second plate segment 412 away from the end of the first plate segment 411. The supporting plate 413 is used to accommodate the abutment portion 13 of the connecting plate 10. The connector 43 is used to detachably connect the positioning plate 42 and the mounting plate 41.

[0051] Specifically, during use, the first plate segments 411 of the two mounting plates 41 are spliced ​​together. After the splicing is completed, the positioning plate 42 is mounted on the mounting plate 41. Finally, the positioning plate 42 is mounted on the mounting plate 41 via the connector 43, so that the mounting plate 41 and the positioning plate 42 form a first fixture 40. After the current collecting component and the electrode tab are welded, the connector 43 is removed, the positioning plate 42 is directly removed along the third direction, and the two mounting plates 41 are withdrawn from between the current collecting component and the electrode assembly along the first direction. This allows the first fixture 40 to be disassembled after use. In addition, the method of detachably connecting the positioning plate 42 and the mounting plate 41 via the connector 43 can adopt conventional designs in the prior art, such as providing threaded holes (not shown) in the positioning plate 42 and the mounting plate 41, and configuring the connector 43 as a bolt; alternatively, a through hole can be provided in the positioning plate 42, and the connector 43 can pass through the through hole of the positioning plate 42 and then engage with the mounting plate 41 (not shown). This is not limited in this application.

[0052] In other embodiments, only one first placement groove 44 may be provided in the first tool 40 , which is only used for welding and positioning one current collecting component.

[0053] See also Figure 5 and Figure 7 The positioning device also includes a second tooling 50, which includes a base plate 51 and a plurality of columns 52. The base plate 51 is used to place the electrode assembly; the columns 52 are fixedly connected to the base plate 51, and the first tooling 40 is arranged on the side of the columns 52 facing away from the base plate 51.

[0054] There are preferably four upright posts 52 , which are respectively arranged at the four corner positions of the base plate 51 .

[0055] In a preferred solution, a positioning groove 521 is formed on a side of the column 52 facing away from the base plate 51 , and at least a portion of the first tool 40 is placed on the positioning groove 521 .

[0056] Positioning the first tooling 40 through the positioning groove 521 can increase the placement stability of the first tooling 40, thereby further increasing the stability of the current collecting component placed in the first tooling 40, thereby improving the welding effect of the current collecting component and the tab.

[0057] Welding process: The mechanical gripper grabs the two electrode assemblies and places them vertically on the second tooling 50 in parallel. The other gripper grabs the first tooling 40 and places it in the positioning groove 521 of the second tooling 50. The positive and negative current collecting components are then sucked into the first tooling 40 through the suction cup. The current collecting components are positioned by the first tooling 40, and the welding pressure nozzle presses the pole ear until the pole ear is tightly fitted with the welding piece 30 of the current collecting component, and then welding is performed. After welding is completed, the first tooling 40 and the electrode assembly are removed at the same time. After the first tooling 40 is disassembled, the electrode assembly is transferred to the next process.

[0058] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0059] 1. Since the welding piece 30 welded to the tab is arranged perpendicular to the connecting portion 12, the tab and the welding piece 30 are connected along the surface of the second direction. Therefore, during the welding process, the electrode assembly can be directly placed upright and welded to the current collecting component. After the tab is welded to the welding piece 30, there is no need to bend the tab. The tab is only subjected to vertical tension, avoiding the risk of the tab sinking and being inserted upside down into the tab, causing short circuit failure of the electrode assembly.

[0060] 2. To improve welding stability, during the pre-welding positioning process, both the first fixture 40 and the electrode assembly need to be placed in a preset position, and the electrode assembly and the first fixture 40 are temporarily fixed. The current collecting component is then placed on the first fixture 40. During this placement process, the current collecting component is positioned by the first fixture 40. The fit between the current collecting component and the positioning device improves positioning accuracy. During welding, when the current collecting component is subjected to force from the welding fixture, the position of the current collecting component will not shift, thus improving the stability of the weld between the electrode assembly and the current collecting component.

[0061] Obviously, the embodiments described above are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0062] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, tasks, devices, components and / or combinations thereof.

[0063] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, such that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0064] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A current collecting component, characterized in that: include: A connecting plate (10), comprising a main body (11) and a connecting portion (12) arranged at one end of the main body (11) along a first direction, the connecting portions (12) being arranged in pairs, and two connecting portions (12) being spaced apart along a second direction perpendicular to the first direction to form a notch; a pole (20) is arranged on one side of the main body (11) along a third direction; A welding piece (30) is provided on the other side of the connecting portion (12) along the third direction, each connecting portion (12) is provided with the welding piece (30), and the surface of the welding piece (30) in the second direction is used for connecting with the tab, and the first direction, the second direction and the third direction are perpendicular to each other.

2. The current collecting component according to claim 1, characterized in that: The length of the welding piece (30) along the first direction is smaller than the length of the connecting portion (12) along the first direction, and the welding piece (30) is spaced apart from the main body portion (11) along the first direction.

3. The current collecting component according to claim 1, characterized in that: The connecting plate (10) further comprises an abutting portion (13), and along the first direction, the abutting portion (13) is located at an end of the connecting portion (12) away from the main body portion (11).

4. The current collecting component according to claim 3, characterized in that: The length of the abutting portion (13) along the first direction is not less than 3 mm.

5. A positioning device for welding and positioning the current collecting component according to any one of claims 1 to 4, characterized in that: The invention comprises a first tool (40), wherein the first tool (40) has: A first placement groove (44), along a first direction, the first placement groove (44) is provided at at least one end of the first tool (40), the first placement groove (44) is for the main body (11) to be placed, and an opening is provided on one side of the first placement groove (44) along the first direction, the opening being used for the connection portion (12) to pass through; A positioning plate (42) is located on a side of the first placement groove (44) where the opening is provided, and the positioning plate (42) is used for engaging with the notch between the two connecting parts (12).

6. The positioning device according to claim 5, characterized in that The positioning plate (42) is partially located in the first placement groove (44), and along the second direction, a second placement groove (45) for limiting the connection portion (12) is formed between the positioning plate (42) and the groove wall of the first placement groove (44); and / or, The first tooling (40) has supporting plates (413) arranged in pairs, the two supporting plates (413) and the first placement groove (44) are spaced apart along the first direction, and the two supporting plates (413) are respectively located on both sides of the positioning plate (42) along the second direction, and the supporting plates (413) are used to place the abutting portion (13) of the connecting plate (10).

7. The positioning device according to claim 5, characterized in that The first tooling (40) is provided with the first placement grooves (44) at both ends along the first direction, the positioning plate (42) is located between the two first placement grooves, the two end faces of the positioning plate (42) along the first direction are respectively used to cooperate with the two first placement grooves (44) to limit the main bodies (11) of the two current collecting components, and the two ends of the positioning plate (42) along the first direction are respectively used to engage with the notches of the two current collecting components.

8. The positioning device according to claim 7, characterized in that The first tooling (40) comprises: Mounting plates (41) are arranged in pairs, the mounting plates (41) comprising a first plate segment (411) and a second plate segment (412) connected to each other, the first placement groove (44) being arranged on the first plate segment (411), and the two second plate segments (412) being detachably connected to each other; A positioning plate (42), along the third direction, the positioning plate (42) is arranged on a side of the mounting plate (41) having the first placement groove (44); along the second direction, two sides of the second plate segment (412) away from one end of the first plate segment (411) are detachably provided with a bearing plate (413), the bearing plate (413) being used to place the abutting portion (13) of the connecting plate (10); A connecting piece (43) is used for detachable connection between the positioning plate (42) and the mounting plate (41).

9. The positioning device according to claim 5, characterized in that The positioning device further comprises a second tool (50), wherein the second tool (50) comprises: A bottom plate (51), the bottom plate (51) is used for placing the electrode assembly; A plurality of columns (52) are fixedly connected to the base plate (51); the first tooling (40) is arranged on a side of the plurality of columns (52) away from the base plate (51).

10. The positioning device according to claim 9, characterized in that A positioning groove (521) is provided on a side of each of the uprights (52) facing away from the base plate (51), and at least a portion of the first tooling (40) is placed in the positioning groove (521).

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