New energy battery structure and welding method

Abstract

The invention provides a new energy battery structure and a welding method, and relates to the technical field of new energy batteries, the new energy battery structure comprises a battery cover, two upper-layer pole groups and two lower-layer pole groups, the battery cover is provided with a positive pole and a negative pole, and positive tabs and negative tabs of the two upper-layer pole groups are respectively welded and fixed with an upper-layer positive connecting sheet and an upper-layer negative connecting sheet. Connecting to form an upper core group; the positive tabs and the negative tabs of the two lower-layer pole groups are respectively welded and fixed with the lower-layer positive connecting sheet and the lower-layer negative connecting sheet to form a lower-layer core group; during assembly, the upper core group is flatly laid and stacked on the lower core group, and the connecting sheets are parallel and are correspondingly welded and fixed with the positive pole and the negative pole; and bendable parts are arranged on the two sides of the upper-layer positive electrode connecting piece and the two sides of the upper-layer negative electrode connecting piece, so that the upper-layer positive electrode connecting piece and the upper-layer negative electrode connecting piece can be bent towards the direction close to the battery cover. The problems that an existing battery soft package module structure is high in manufacturing cost and low in production efficiency are solved.

Description

Technical Field

[0001] This invention relates to the field of new energy battery technology, and more specifically, to a new energy battery structure and welding method. Background Technology

[0002] To improve battery capacity, ensure battery safety, and reduce losses, most existing batteries have increased from two electrode groups to four. However, if the original connecting tabs are used for welding four electrode groups, the tabs of the upper electrode group (the electrode group furthest from the connecting tabs during welding) need to be lengthened. Therefore, the equipment and machines used to manufacture the upper electrode group need corresponding modifications, resulting in high costs. Furthermore, longer tabs are prone to defects such as creases and tears during production. To address this, Chinese patent CN216488397U discloses a four-pole battery structure and its assembly method. The second pole group (equivalent to the upper pole group) is bent at the positive and negative tabs and then fixed at a 90-degree angle to the planes of the first positive and negative connecting pieces, either by clamping or welding. The first pole group (equivalent to the lower pole group) and the second pole group are arranged in an L-shape. The third pole group (equivalent to the upper pole group) is bent at the positive and negative tabs and then fixed at a 90-degree angle to the planes of the second positive and negative connecting pieces, either by clamping or welding. The third pole group and the fourth pole group (equivalent to the lower pole group) are arranged in an L-shape. After the positive and negative connecting pieces are connected to the internal connection area of ​​the battery cover, the second and fourth pole groups are bent upwards respectively. While this approach avoids lengthening the tabs of the upper pole group, the need for a 90-degree clamp or welding fixation is inconvenient for operation, affecting welding and assembly efficiency and hindering manufacturing. Summary of the Invention

[0003] This invention discloses a new energy battery structure, which aims to improve the problems of high manufacturing cost and low production efficiency of existing battery pouch module structures.

[0004] The present invention adopts the following solution:

[0005] A new energy battery structure includes a battery cover, two upper electrode groups, and two lower electrode groups. The battery cover has a positive electrode post and a negative electrode post. The positive and negative electrode tabs of the two upper electrode groups are welded and fixed to the upper positive and upper negative electrode connecting pieces, respectively, to form an upper core group. The positive and negative electrode tabs of the two lower electrode groups are welded and fixed to the lower positive and lower negative electrode connecting pieces, respectively, to form a lower core group. During assembly, the upper core groups are laid flat on the lower core groups, and each connecting piece is parallel and correspondingly welded and fixed to the positive and negative electrode posts. Both sides of the upper positive and upper negative electrode connecting pieces are provided with bendable portions, allowing the upper positive and upper negative electrode connecting pieces to be bent towards the battery cover to reduce the length of the electrode tabs of the two upper electrode groups.

[0006] As a further improvement, the four pole groups have the same structure.

[0007] As a further improvement, the bendable portion is configured to bend towards the battery cover and parallel to the connecting piece when the core is closed.

[0008] As a further improvement, the lower positive electrode connecting piece and the upper positive electrode connecting piece are each welded to half of the welding surface of the positive electrode post; the lower negative electrode connecting piece and the upper negative electrode connecting piece are each welded to half of the welding surface of the negative electrode post.

[0009] As a further improvement, the upper connecting piece has an overlapping portion that is stacked parallel to the lower connecting piece, and a welding portion that extends outward along the overlapping portion, the welding portion being used to weld and fix it to the welding surface.

[0010] As a further improvement, the welding surface of the welded part is parallel to the welding surface of the lower connecting piece used for welding with the pole post.

[0011] As a further improvement, the welding portion of the upper positive electrode connecting piece is symmetrically arranged with the welding portion of the upper negative electrode connecting piece.

[0012] As a further improvement, the battery cover is provided with positioning posts, and each connecting piece is provided with positioning holes for fitting the positioning posts.

[0013] As a further improvement, the battery cover is provided with a first stop and a second stop, the first stop being used to restrict the rotation of the lower connecting piece, and the second stop being used to restrict the rotation of the upper connecting piece.

[0014] Another welding method for a new energy battery structure is provided, including the following steps:

[0015] S1: Two upper electrode groups are laid flat. The positive tabs of the two upper electrode groups are respectively welded to both ends of the upper positive electrode connecting piece, and the negative tabs of the two upper electrode groups are respectively welded to both ends of the upper negative electrode connecting piece to form the upper core group; two lower electrode groups are laid flat. The positive tabs of the two lower electrode groups are respectively welded to both ends of the lower positive electrode connecting piece, and the negative tabs of the two lower electrode groups are respectively welded to both ends of the lower negative electrode connecting piece to form the lower core group;

[0016] S2: Align the connecting piece of the lower core assembly with the positive and negative terminals on the battery cover, weld the lower positive connecting piece to the positive terminal, and weld the lower negative connecting piece to the negative terminal.

[0017] S3: Place the upper core assembly horizontally on the lower core assembly, drive the upper positive electrode connecting piece and the upper negative electrode connecting piece downwards, weld the upper positive electrode connecting piece to the positive electrode post and weld the upper negative electrode connecting piece to the negative electrode post.

[0018] S4: Fold the four electrode groups upwards respectively to perform core joining. After core joining, the four electrode groups are perpendicular to the plane of the battery cover.

[0019] By adopting the above technical solution, the present invention can achieve the following technical effects:

[0020] 1. This application incorporates bendable portions on the upper positive and negative electrode connecting pieces, allowing the upper connecting pieces connected to the tabs to be bent from a horizontal position to a downward tilt. This compensates for the distance between the tabs and terminals of the upper electrode assembly, thereby reducing the tab length of the two upper electrode assemblies. In other words, the upper tabs do not need to be longer than the lower tabs in this application, enabling both upper and lower electrode assemblies to be produced using the same equipment, thus saving equipment costs. Simultaneously, it avoids defects caused by long tabs during manufacturing, further reducing the overall battery cost. Furthermore, both the upper and lower electrode assemblies can be welded horizontally, resulting in high welding efficiency and improved production efficiency.

[0021] 2. The four electrode groups have the same structure and can be interchanged. Only one type of electrode group needs to be produced during production, which is beneficial for warehousing and assembly, saves costs, and reduces losses.

[0022] 3. The bendable portion is designed to bend towards the battery cover until it is parallel to the connecting piece when the core is assembled, thus saving structural space.

[0023] 4. The lower positive electrode connecting piece and the upper positive electrode connecting piece are each welded to half of the positive electrode post's welding surface; the lower negative electrode connecting piece and the upper negative electrode connecting piece are each welded to half of the negative electrode post's welding surface. This avoids the problem of incomplete or false soldering caused by overlapping welding of the two connecting pieces, further ensuring battery performance. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of one embodiment of the present invention;

[0026] Figure 2 yes Figure 1 A cross-sectional view along one of its sections;

[0027] Figure 3 yes Figure 1 A schematic diagram of the structure after the shell has been concealed.

[0028] Figure 4 yes Figure 3 A cross-sectional view along one of its sections;

[0029] Figure 5 and Figure 6 yes Figure 3 Schematic diagrams of the structure from different perspectives after the battery cover is hidden;

[0030] Figure 7 This is a schematic diagram of the structure of the battery cover and connecting pieces when they are fixed according to one embodiment of the present invention;

[0031] Figure 8 yes Figure 7 Exploded view;

[0032] Figure 9 This is a schematic diagram of the lower core assembly according to one embodiment of the present invention;

[0033] Figure 10 This is a schematic diagram of the upper core assembly according to one embodiment of the present invention;

[0034] Figure 11 and Figure 12 This is a schematic diagram of the upper core assembly and the lower core assembly from different perspectives during assembly according to one embodiment of the present invention;

[0035] Figure 13 yes Figure 12 A sectional view along one of its sections.

[0036] icon:

[0037] 1-Battery cover; 11-Positive terminal; 12-Negative terminal; 13-Positioning post; 14-First gear position; 15-Second gear position; 16-Explosion-proof valve;

[0038] 2-Upper electrode assembly; 21-Positive electrode tab; 22-Negative electrode tab;

[0039] 3-Lower electrode group; 31-Positive electrode tab; 32-Negative electrode tab;

[0040] 4-Upper positive electrode connecting piece; 41-Bendable part; 42-Overlapping part; 43-Welding part;

[0041] 5-Upper negative electrode connecting piece; 51-Bendable part; 52-Overlapping part; 53-Welding part;

[0042] 6-Lower layer positive electrode connecting piece;

[0043] 7-Lower layer negative electrode connection piece;

[0044] 8-Shell. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to represent selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0046] The terms “top,” “bottom,” “upper,” “lower,” “left,” “right,” “front,” “back,” and similar expressions used in this document are for illustrative purposes only. The terms “first,” “second,” etc., are only used to distinguish different objects and should not be construed as indicating or implying relative importance or the quantity, specific order, or primary or secondary relationship of the indicated technical features. The term “several” means one or more, and “multiple” means two or more, unless otherwise explicitly specified.

[0047] Example

[0048] Combination Figures 1 to 13 This embodiment provides a new energy battery structure, including a battery cover 1, two upper electrode groups 2, and two lower electrode groups 3. The battery cover 1 is provided with a positive electrode post 11 and a negative electrode post 12. The positive electrode tabs 21 and negative electrode tabs 22 of the two upper electrode groups 2 are welded and fixed to the upper positive electrode connecting piece 4 and the upper negative electrode connecting piece 5, respectively, to form an upper core group. The positive electrode tabs 31 and negative electrode tabs 32 of the two lower electrode groups 3 are welded and fixed to the lower positive electrode connecting piece 6 and the lower negative electrode connecting piece 7, respectively, to form a lower core group. During assembly, the upper core groups are laid flat on the lower core groups, and each connecting piece is parallel and welded and fixed to the positive electrode post 11 and the negative electrode post 12. The upper positive electrode connecting piece 4 and the upper negative electrode connecting piece 5 are provided with bendable portions (41, 51) on both sides, so that the upper positive electrode connecting piece 4 and the upper negative electrode connecting piece 5 can be bent toward the direction of the battery cover 1 to reduce the length of the tabs of the two upper electrode groups 2.

[0049] For example, the battery cover 1 is rectangular and is used to fix it to the housing 8. The positive terminal 11 and the negative terminal 12 are respectively disposed at both ends of the battery cover 1. Both the positive terminal 11 and the negative terminal 12 have one end exposed on the outside of the battery cover 1 and the other end located on the inside of the battery cover 1, and are limited by a gasket. An insulating component is installed between the two terminals and the battery cover 1 to prevent short circuit between the positive terminal 11 and the negative terminal 12. Each connecting piece is welded to the terminal located on the inside of the battery cover 1. During assembly, the two upper and lower electrode groups are located on both sides of the battery cover 1, and the two upper electrode groups 2 are laid flat on the lower electrode group 3 to keep the welding direction of the connecting pieces consistent, which facilitates welding and improves welding efficiency.

[0050] It should be noted that in this embodiment, by providing bendable portions (41, 51) on the upper positive electrode connecting piece 4 and the upper negative electrode connecting piece 5, the two sides of the upper connecting piece connected to the tab can be bent from a horizontal position to a downward tilt, thereby compensating for the distance between the tab and the terminal post of the upper electrode group 2, and thus reducing the length of the tabs of the two upper electrode groups 2. That is to say, in this embodiment, the length of the upper electrode tab does not need to be increased compared with the lower electrode tab, so that the upper electrode group 2 and the lower electrode group 3 can be produced by the same machine, thereby saving equipment costs. At the same time, it can also avoid the defects of long tabs in the manufacturing process, further reducing the overall cost of the battery. In addition, both the upper electrode group 2 and the lower electrode group 3 can be welded in the horizontal direction, with high welding efficiency, which is conducive to improving production efficiency.

[0051] In a preferred embodiment, the four electrode groups have the same structure, meaning that the four electrode groups can be interchanged. Only one type of electrode group needs to be produced during manufacturing, which is beneficial for warehousing and assembly, saves costs, and reduces losses.

[0052] Based on the above embodiments, in an optional embodiment of the present invention, the bendable portions (41, 51) are configured to bend towards the battery cover 1 and parallel to the connecting piece when the core is closed. Specifically, refer to... Figure 10 During the welding of the upper core assembly, the upper positive electrode connecting piece 4 and the upper negative electrode connecting piece 5 are horizontally positioned, and the tabs of the two upper electrode assemblies 2 are welded and fixed to the bendable portions (41, 51). (Refer to...) Figure 11 When placing the upper core assembly onto the lower core assembly, the bending portion is bent downwards by pressing or stamping. At this time, the bendable portion (41, 51) is tilted downwards to bring the upper connecting piece closer to the pole post. After the upper connecting piece is welded and fixed to the pole post, the upper pole assembly 2 is rotated 90 degrees so that the bendable portion (41, 51) is bent from the tilted downwards state to a state parallel to the connecting piece, in order to save structural space. Then, the lower pole assembly 3 is rotated 90 degrees and then the core assembly is joined. After joining, refer to... Figure 3The upper connecting piece is a sheet metal part, and a bending groove is provided on the bendable part (41,51) to ensure that the bending angle of the bendable parts (41,51) on both sides is the same. However, this is not the only limitation.

[0053] In another embodiment, the lower positive electrode connecting piece 6 and the upper positive electrode connecting piece 4 are each welded to half of the welding surface of the positive electrode post 11; the lower negative electrode connecting piece 7 and the upper negative electrode connecting piece 5 are each welded to half of the welding surface of the negative electrode post 12. This avoids the problem of incomplete or false soldering caused by overlapping welding of the two connecting pieces, further ensuring the performance of the battery. For example, the upper connecting piece has an overlapping portion (42, 52) that is parallel to the lower connecting piece, and a welding portion (43, 53) extending outward along the overlapping portion, which is used to weld and fix to the welding surface. Preferably, the welding surface of the welding portion (43, 53) is parallel to the welding surface of the lower connecting piece used to weld to the electrode post, so as to ensure the welding reliability of the upper and lower connecting pieces to the electrode post, so that the two welding pieces can be welded simultaneously, saving welding steps. Furthermore, the welding portion 43 of the upper positive electrode connecting piece 4 and the welding portion 53 of the upper negative electrode connecting piece 5 are symmetrically arranged, and the two welding portions (43, 53) extend towards the end of the battery cover 1 to make the structure more compact and avoid interference with the explosion-proof valve 16 in the middle of the battery cover 1.

[0054] Based on the above embodiments, in an optional embodiment of the present invention, the battery cover 1 is provided with a positioning post 13, and each connecting piece is provided with a positioning hole for fitting with the positioning post 13. During assembly, the positioning holes on each connecting piece are aligned with the positioning post 13 and inserted to position the connecting piece. Preferably, the battery cover 1 is provided with a first stop portion 14 and a second stop portion 15. The first stop portion 14 is used to restrict the rotation of the lower connecting piece, and the second stop portion 15 is used to restrict the rotation of the upper connecting piece. The stop portion can be a rib provided along the inner side of the battery cover 1. After the connecting piece is inserted into the positioning post 13, its straight edge abuts against the stop portion to restrict the connecting piece from rotating around the positioning post 13, thereby limiting the connecting piece and ensuring the accurate welding position of each connecting piece and the terminal post.

[0055] Another welding method for a new energy battery structure is provided, including the following steps:

[0056] S1: Reference Figure 10 Two upper electrode groups 2 are laid flat, and the positive electrode tabs 21 of the two upper electrode groups 2 are respectively welded to both ends of the upper positive electrode connecting piece 4. The negative electrode tabs 22 of the two upper electrode groups 2 are respectively welded to both ends of the upper negative electrode connecting piece 5 to form the upper core group; refer to Figure 9 Two lower electrode groups 3 are laid flat, and the positive electrode tabs 31 of the two lower electrode groups 3 are respectively welded to the two ends of the lower positive electrode connecting piece 6. The negative electrode tabs 32 of the two lower electrode groups 3 are respectively welded to the two ends of the lower negative electrode connecting piece 7 to form a lower core group.

[0057] S2: Align the connecting piece of the lower core assembly with the positive electrode post 11 and the negative electrode post 12 on the battery cover 1, weld the lower positive electrode connecting piece 6 to the positive electrode post 11 and weld the lower negative electrode connecting piece 7 to the negative electrode post 12.

[0058] S3: Reference Figure 11 The upper core assembly is placed horizontally on the lower core assembly, and the upper positive electrode connecting piece 4 and the upper negative electrode connecting piece 5 are driven to bend downwards. The upper positive electrode connecting piece 4 is welded and fixed to the positive electrode post 11, and the upper negative electrode connecting piece 5 is welded and fixed to the negative electrode post 12. The bending of the bendable part (41, 51) can be achieved by a stamping machine, or by pressing or manually bending the bendable part (41, 51). In other embodiments, the upper core assembly can be bent first and then placed horizontally on the lower core assembly. No specific limitation is made.

[0059] S4: Fold the four electrode groups upwards respectively for core joining. After core joining, the four electrode groups are perpendicular to the plane of the battery cover 1. (Refer to...) Figure 3 and Figure 4 After folding, the two upper pole groups 2 are located in the middle, and the two lower pole groups 3 are located at both ends.

[0060] It should be noted that in this embodiment, whether it is welding the two lower electrode groups 3 to the lower connecting pieces, welding the two upper electrode groups 2 to the upper connecting pieces, or welding each connecting piece to the electrode post, all can be performed with the electrode groups laid out horizontally, thereby ensuring consistent welding direction and improving welding efficiency. Furthermore, during the welding process between the connecting pieces and the electrode posts, there is no need to use clamps or other fixtures to fix the electrode groups, and its advantages are obvious compared to existing technologies.

[0061] The above are merely preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions that fall within the scope of the present invention are within the scope of protection of the present invention.

Claims

1. A new energy battery structure, characterized in that, The battery cover is provided with a positive pole and a negative pole, the positive lug and the negative lug of the two upper layer pole groups are respectively welded and fixed with the upper layer positive connecting piece and the upper layer negative connecting piece to form the upper layer core group, and the positive lug and the negative lug of the two lower layer pole groups are respectively welded and fixed with the lower layer positive connecting piece and the lower layer negative connecting piece to form the lower layer core group. In the assembling process, the upper layer core group is laid on the lower layer core group, and the connecting pieces are parallel and correspondingly welded and fixed with the positive pole and the negative pole.

2. The new energy battery structure according to claim 1, characterized in that, The four pole groups are of the same structure.

3. The new energy battery structure according to claim 1, characterized in that, The bendable part is configured to be bent towards the battery cover during the core combining process.

4. The new energy battery structure according to claim 1, characterized in that, The lower layer positive connecting piece and the upper layer positive connecting piece are respectively welded with the welding surface of half of the positive pole, and the lower layer negative connecting piece and the upper layer negative connecting piece are respectively welded with the welding surface of half of the negative pole.

5. The new energy battery structure according to claim 4, characterized in that, The upper layer connecting piece has a coincident part parallel to the lower layer connecting piece and a welding part extending outward along the coincident part, and the welding part is used for welding and fixing with the welding surface.

6. The new energy battery structure according to claim 5, characterized in that, The welding surface of the welding part is parallel to the welding surface of the lower layer connecting piece.

7. The new energy battery structure according to claim 5, characterized in that, The welding part of the upper layer positive connecting piece is symmetrically arranged with the welding part of the upper layer negative connecting piece.

8. The new energy battery structure according to claim 1, characterized in that, The battery cover is provided with a positioning column, and each connecting piece is provided with a positioning hole matched with the positioning column.

9. The new energy battery structure according to claim 8, characterized in that, The battery cover is provided with a first stop part and a second stop part, the first stop part is used for limiting the rotation of the lower layer connecting piece, and the second stop part is used for limiting the rotation of the upper layer connecting piece.

10. A method of welding a new energy cell structure according to any one of claims 1 to 9, characterized by, The method comprises the following steps: S1: two upper layer pole groups are laid flat, the positive lug of the two upper layer pole groups is respectively welded at both ends of the upper layer positive connecting piece, the negative lug of the two upper layer pole groups is respectively welded at both ends of the upper layer negative connecting piece to form the upper layer core group, two lower layer pole groups are laid flat, the positive lug of the two lower layer pole groups is respectively welded at both ends of the lower layer positive connecting piece, and the negative lug of the two lower layer pole groups is respectively welded at both ends of the lower layer negative connecting piece to form the lower layer core group; S2: the connecting pieces of the lower layer core group are aligned with the positive pole and the negative pole on the battery cover, the lower layer positive connecting piece is welded and fixed with the positive pole, and the lower layer negative connecting piece is welded and fixed with the negative pole; S3: the upper layer core group is horizontally placed on the lower layer core group, the upper layer positive connecting piece and the upper layer negative connecting piece are bent downward, the upper layer positive connecting piece is welded and fixed with the positive pole, and the upper layer negative connecting piece is welded and fixed with the negative pole; S4: the four pole groups are respectively folded upward, and the core combining process is performed, and the four pole groups are perpendicular to the plane of the battery cover after the core combining.

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