Novel flexible connection structure welding process

Abstract

The invention discloses a novel flexible connection structure welding technology. The novel flexible connection structure welding technology comprises the following steps that S1, a tab of a lithium battery roll core is pressed through a tab shaping pressing block; s2, clamping the positive tabs and the negative tabs of the two lithium battery roll cores through a connecting piece assembly, wherein the connecting piece assembly comprises an upper connecting piece and a lower connecting piece which can be buckled; and S3, a cover plate is placed at the lower ends of the two lower connecting pieces and welded through a galvanometer laser welding machine. Therefore, the connecting piece structure is changed into a clamping structure in which the upper connecting piece and the lower connecting piece can be buckled up and down, so that an existing pre-welding process is canceled, ultrasonic welding of the connecting pieces and the tabs is changed into laser welding, machining of a multi-welding-printing all-in-one machine is achieved through the galvanometer, welding is not needed in multiple procedures, and machining is not needed. The production cost is reduced; and the loss of large-batch isolation downshift caused by incapability of identifying the risk battery is also avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery core connection, and in particular to a novel welding process for a soft connection structure. Background Art

[0002] As the world pays more attention to environmental protection and energy transformation, the new energy vehicle market continues to expand. As the core component of new energy vehicles, the demand for lithium batteries has also increased. The rapid growth of the new energy vehicle market has provided a huge market space for the lithium battery industry; with the rapid development of renewable energy such as solar and wind energy, energy storage systems have become a key means to solve the imbalance between energy supply and demand. Lithium batteries have been widely used in the field of energy storage due to their high energy density and long cycle life, and market demand will increase further in the future; with the advancement of technology and consumption upgrades, the demand for lithium batteries in consumer electronic products such as mobile phones and laptops will continue to grow. With the growth of market demand and the continuous maturity of technology, the lithium battery industry has gradually achieved large-scale production. Large-scale production will help improve production efficiency, reduce costs, and further enhance the competitiveness of lithium batteries. As the lithium battery industry gradually matures, lithium battery production lines and processes are also constantly being updated.

[0003] At present, the connection between the inner winding cores of lithium batteries requires multiple welding processes, such as Figure 1 and Figure 2 and Figure 3 As shown, the winding core tabs need to be pre-welded and fixed by ultrasonic welding equipment, and then the tabs 02 of the winding core 01 and the tabs 04 of the winding core 03 are connected by ultrasonic welding through the connecting piece 05, and finally the connecting piece 05 is connected to the cover plate 06 by laser welding. There are three welding processes and ten welding marks in total, which greatly increases the difficulty of process control, and the metal foreign matter produced by ultrasonic welding is still a great threat to the safety of battery products.

[0004] The connection between the existing lithium battery inner cores requires the investment of multiple independent welding equipment, which has high investment costs. In addition, multiple welding equipment occupies a large area and requires a larger production space, which further increases production costs. In addition, ultrasonic welding is currently used to connect the connecting piece and the pole ear. There is currently no particularly effective means of online monitoring of the welding effect of ultrasonic welding, and it is impossible to identify risk batteries when welding abnormalities occur. Summary of the invention

[0005] In order to solve the technical problems existing in the background technology, the present invention proposes a novel welding process for a soft connection structure.

[0006] A novel soft connection structure welding process proposed by the present invention comprises the following steps:

[0007] S1, pressing the tabs of the lithium battery core through the tab shaping block;

[0008] S2, the positive and negative pole ears of the two lithium battery coils are clamped by a connecting piece assembly, wherein the connecting piece assembly includes an upper connecting piece and a lower connecting piece that can be buckled;

[0009] S3, placing the cover plate on the lower ends of the two lower connecting plates and welding them by a galvanometer laser welding machine.

[0010] In summary, there is no need for welding in multiple steps and no need for multiple equipment for processing, which reduces production costs; it also avoids the losses caused by large-scale isolation and downgrade due to the inability to identify risky batteries.

[0011] Preferably, in step S2, one of the upper connecting piece and the lower connecting piece is provided with a slot, and the other is provided with a block, and the block is engaged in the slot.

[0012] Changing from welding to clamping can save production costs.

[0013] Preferably, the structures of the upper connecting plate and the lower connecting plate are set to be U-shaped structures, and the two sides of the U-shaped structure are respectively used to press the tabs of the two lithium battery coils.

[0014] Preferably, the cover plate is configured as a rectangular structure.

[0015] Preferably, the galvanometer laser welding machine is equipped with a galvanometer welding head, and the galvanometer welding head is used to complete the welding of the two laser welding points on the cover plate and the four laser welding points on the connecting piece assembly.

[0016] The galvanometer is used to realize the multi-welding and printing all-in-one machine to complete the processing. There is no need to carry out welding in multiple steps or multiple equipment for processing, which reduces the production cost.

[0017] Preferably, in step S2, before welding by the galvanometer laser welding machine, the connecting piece assembly and the cover plate are firstly pressed by a jig.

[0018] Preferably, in step S2, the positive electrode ears of the two lithium battery roll cores are located between the upper connecting sheet and the lower connecting sheet of one group of connecting sheet assemblies, and the two positive electrode ears are clamped together by buckling the upper connecting sheet and the lower connecting sheet, and the negative electrode ears of the two lithium battery roll cores are located between the upper connecting sheet and the lower connecting sheet of the other group of connecting sheet assemblies, and the two negative electrode ears are clamped together by buckling the upper connecting sheet and the lower connecting sheet.

[0019] In summary, the present invention has the following beneficial effects: by changing the connecting plate structure into a clamping structure that can be buckled on the upper and lower connecting plates, the existing pre-welding process is eliminated, and the ultrasonic welding of the connecting plate and the pole ear is changed to laser welding, and the processing is completed by a multi-welding and printing all-in-one machine through a galvanometer. There is no need for welding in multiple steps, and no need for multiple equipment for processing, thereby reducing production costs; it also avoids the loss of large-scale isolation and downshifting due to the inability to identify risky batteries.

[0020] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the existing winding core tab pre-welding;

[0022] Figure 2 A schematic diagram of ultrasonic welding of the pole lugs of the existing A winding core and the pole lugs of the B winding core through a connecting piece;

[0023] Figure 3 It is a schematic diagram of laser welding of an existing connecting piece and a cover plate;

[0024] Figure 4 This is a schematic diagram of the soft connection structure of the inner winding core of a lithium battery in an embodiment of the present invention;

[0025] Figure 5 It is a schematic diagram of the connection piece buckling and clamping the pole ear in an embodiment of the present invention;

[0026] Figure 6 Schematic diagram of the welding connection between the cover plate and the connecting piece in an embodiment of the present invention;

[0027] Figure 7 for Figure 6 Top view of the .

[0028] Figure 4-7 middle:

[0029] 1. Lithium battery core; 2. Positive ear; 3. Negative ear; 4. Upper connecting piece; 5. Lower connecting piece; 6. Ear shaping block; 7. Cover plate; 8. Galvanometer laser welding machine; 9. Cover plate laser welding; 10. Connecting piece laser welding. DETAILED DESCRIPTION

[0030] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar symbols throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0031] like Figure 4-7 As shown, a novel soft connection structure welding process proposed in this embodiment includes the following steps:

[0032] S1, pressing the tab of the lithium battery core 1 by means of a tab shaping press block;

[0033] S2, the positive pole ears 2 and the negative pole ears 3 of the two lithium battery coils 1 are clamped by a connecting piece assembly, and the connecting piece assembly includes an upper connecting piece 4 and a lower connecting piece 5 that can be buckled;

[0034] S3, placing the cover plate 7 on the lower ends of the two lower connecting plates 5 and welding them by a galvanometer laser welding machine 8.

[0035] In this way, by changing the connecting plate structure into a clamping structure that can be buckled on the upper and lower connecting plates 4 and 5, the existing pre-welding process is eliminated, and the ultrasonic welding of the connecting plate and the pole ear is changed to laser welding. The processing is completed by a multi-welding and printing all-in-one machine through a galvanometer. There is no need for welding in multiple steps, and no need for multiple equipment for processing, which reduces production costs; it also avoids the loss of large-scale isolation and downshifting due to the inability to identify risky batteries.

[0036] Furthermore, in step S2, one of the upper connecting piece 4 and the lower connecting piece 5 is provided with a slot, and the other is provided with a block, and the block is engaged in the slot. Specifically, the engagement structure can also be other structures, which can be referred to the existing structure, and will not be repeated in this article.

[0037] It should be noted that in step S2, before the galvanometer laser welding machine 8 welds, the connecting piece assembly and the cover plate 7 are first pressed by a jig.

[0038] In step S2, the positive electrode ears 2 of the two lithium battery cores 1 are located between the upper connecting sheet 4 and the lower connecting sheet 5 of one set of connecting sheet assemblies, and the two positive electrode ears 2 are clamped together by buckling the upper connecting sheet 4 and the lower connecting sheet 5, and the negative electrode ears 3 of the two lithium battery cores 1 are located between the upper connecting sheet 4 and the lower connecting sheet 5 of the other set of connecting sheet assemblies, and the two negative electrode ears 3 are clamped together by buckling the upper connecting sheet 4 and the lower connecting sheet 5.

[0039] Furthermore, if Figure 7 As shown, the structures of the upper connecting piece 4 and the lower connecting piece 5 are set to be a U-shaped structure, and the two sides of the U-shaped structure are respectively used to press the tabs of the two lithium battery cores 1.

[0040] The cover plate 7 is configured as a rectangular structure.

[0041] like Figure 7As shown, the galvanometer laser welding machine 8 is equipped with a galvanometer welding head, which is used to complete the welding of two laser welding points on the cover plate 7 and four laser welding points on the connecting piece assembly. The original ultrasonic welding of the connecting piece is changed to laser welding, which reduces the generation of metal foreign matter and reduces the safety risk of the battery cell.

[0042] In summary, the pole ears (including positive pole ears and negative pole ears) of the lithium battery core 1 are not pre-welded, and the pole ears are pressed and shaped by the pole ear shaping block 10. The upper connecting piece 4 and the lower connecting piece 5 are set to a snap-fit ​​structure. The upper connecting piece 4 and the lower connecting piece 5 are provided with two groups, which respectively clamp the positive pole ear 2 and the negative pole ear 3 of the two lithium battery cores 1; after the connecting piece assembly is placed on the cover plate 7, it is pressed by a special tooling fixture, and the galvanometer welding head is directly used for welding, and the two cover plate laser weld marks 9 and the four connecting piece laser weld marks 10 are directly completed. Multiple weld marks can be processed by one welding machine, reducing equipment investment and production site use; in this way, the welding process in this embodiment does not require pre-welding, does not need to use ultrasonic welding, does not need to be welded in multiple steps, and does not require multiple equipment for processing.

[0043] It should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0044] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0045] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; 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, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0047] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A new type of soft connection structure welding process, characterized in that: The following steps are involved: S1, pressing the tabs of the lithium battery core through the tab shaping block; S2, the positive and negative pole ears of the two lithium battery coils are clamped by a connecting piece assembly, wherein the connecting piece assembly includes an upper connecting piece and a lower connecting piece that can be buckled; S3, placing the cover plate on the lower ends of the two lower connecting plates and welding them by a galvanometer laser welding machine.

2. The novel soft connection structure welding process according to claim 1 is characterized in that: In the step S2, one of the upper connecting piece and the lower connecting piece is provided with a slot, and the other is provided with a block, and the block is engaged in the slot.

3. The novel soft connection structure welding process according to claim 2 is characterized in that: The structures of the upper connecting plate and the lower connecting plate are set as a U-shaped structure, and the two sides of the U-shaped structure are respectively used to press the tabs of the two lithium battery coils.

4. The novel soft connection structure welding process according to claim 1 is characterized in that: The cover plate is configured as a rectangular structure.

5. The novel soft connection structure welding process according to claim 1 is characterized in that: The galvanometer laser welding machine is equipped with a galvanometer welding head, and the galvanometer welding head is used to complete the welding of two laser welding points on the cover plate and four laser welding points on the connecting piece assembly.

6. The novel soft connection structure welding process according to claim 1 is characterized in that: In the step S2, before welding by the galvanometer laser welding machine, the connecting piece assembly and the cover plate are first pressed by a fixture.

7. The novel soft connection structure welding process according to claim 2 is characterized in that: In step S2, the positive pole ears of the two lithium battery roll cores are located between the upper connecting plate and the lower connecting plate of one group of connecting plate assemblies, and the two positive pole ears are clamped together by buckling the upper connecting plate and the lower connecting plate. The negative pole ears of the two lithium battery roll cores are located between the upper connecting plate and the lower connecting plate of the other group of connecting plate assemblies, and the two negative pole ears are clamped together by buckling the upper connecting plate and the lower connecting plate.

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