Large cylindrical battery with PACK same-side welding rolling groove sealing structure

Abstract

The invention discloses a PACK same-side welded rolling groove sealing structure large cylindrical battery, which comprises a plurality of battery main bodies and modules, each battery main body is provided with a rolling groove seal, a cover cap, a steel shell, a rolling groove end height, a cover cap explosion-proof sheet, a cover cap rubber ring and a PACK connecting sheet, the steel shell wraps the outer side of the battery main body, the cover cap is located at the top of the steel shell, and the PACK connecting sheet is located at the bottom of the steel shell. The cap anti-explosion piece is located on the inner side of the steel shell, the rolling groove end height is located on the top of the outer side of the rolling groove sealing opening, and the cap rubber ring is located on the inner side of the rolling groove end height. The length of the covered edge of the cap anti-explosion piece is larger than that of a conventional cap, the height of the cap rubber ring is larger than that of the conventional cap, the end height of the steel shell rolling groove is larger than that of a conventional battery, the covered edge of the sealed steel shell is longer to form an effective negative electrode end, and the requirement for welding the positive electrode and the negative electrode on the same side in PACK application of the rolling groove sealing structure battery can be met; and the length of the covered edge of the steel shell is long, so that the sealing area is effectively increased, and the liquid leakage abnormity is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of large cylindrical batteries, and in particular to a large cylindrical battery with a PACKable same-side welding rolling groove sealing structure. Background Art

[0002] The existing CTC chassis flat battery technology requires that the single cell has the requirement of welding the positive and negative electrodes on the same side. The conventional design of large cylindrical batteries on the market that can meet the requirements of welding the positive and negative electrodes on the same side is laser welding sealing. In this structure, the bottom of the steel shell of the battery is used as the negative electrode, and the aluminum rivet designed at the bottom of the shell is used as the positive electrode to achieve the same-side welding of the positive and negative electrodes. However, this structure is sealed by laser welding, which is difficult to process, the technology is immature, the yield is low, and the laser welding is prone to leakage. Summary of the invention

[0003] Based on the technical problems existing in the background technology, the present invention proposes a large cylindrical battery with a rolling groove sealing structure that can be welded on the same side of the PACK. After mechanical stamping and sealing, the steel shell has a long edge length to form an effective welding area. The plane of the steel shell edge serves as the lead-out terminal of the negative electrode, and the top cover of the cap serves as the lead-out terminal of the positive electrode. When making the PACK, the requirement of welding the positive and negative electrodes on the same side can be met. The existing large cylindrical batteries that can achieve welding of the positive and negative electrodes on the same side are all laser welded sealed batteries. Compared with laser welded sealed batteries, this battery has the advantages of simple and mature process, low equipment investment cost, and high yield rate. In addition, the long edge length of the battery of this invention effectively increases the sealing area of ​​the seal, and has better sealing than conventional rolling groove sealed batteries, improving the abnormal leakage of the seal.

[0004] The present invention proposes a large cylindrical battery with a PACK same-side welded rolling groove sealing structure, comprising a plurality of battery bodies and modules, wherein the battery bodies are provided with rolling groove sealing, caps, steel shells, rolling groove end heights, cap explosion-proof plates, cap rubber rings, and PACK connecting plates, wherein the steel shells are wrapped around the outside of the battery bodies, the caps are located on the top of the steel shells, the cap explosion-proof plates are located on the inside of the steel shells, the rolling groove end heights are located on the outside top of the rolling groove sealing, the cap rubber rings are located on the inside of the rolling groove end heights, and the PACK connecting plates are located on the tops of the plurality of battery bodies and are welded to the plurality of battery bodies.

[0005] Preferably, the top plane of the steel shell edge is the negative electrode lead-in terminal, and the top cover of the cap is the positive electrode lead-in terminal.

[0006] Preferably, the height of the grooved end is higher than that of a conventional grooved battery end, the edging length of the cap explosion-proof plate is longer than that of an ordinary cap, and the height of the cap rubber ring is higher than that of an ordinary cap rubber ring.

[0007] Preferably, the length of the negative electrode lead-out terminal of the battery body is longer than the length of the edge of an ordinary groove-sealed battery. In the welding of the PACK connecting piece, the welding area is effectively increased to achieve the same-side welding of the groove-sealed structure battery, and the edge length of the shell after sealing is long, which can increase the sealing tightness of the seal and improve the leakage abnormality.

[0008] Preferably, the PACK connecting sheet is made of nickel or nickel-plated copper, and is designed to have a height difference between the positive electrode welding point and the negative electrode welding point, so as to facilitate welding of the positive and negative electrodes on the same side.

[0009] Preferably, the module is a grooved sealing structure battery with positive and negative electrodes welded on the same side, which can realize the technology of laying the battery flat on the CTC vehicle chassis.

[0010] Preferably, the PACK connecting piece and the battery body are welded by laser welding. Compared with welding on the opposite side, welding the negative electrode lead-out terminal will not cause welding leakage compared with welding the shell bottom.

[0011] In the present invention, the edge length of the cap explosion-proof plate is longer than that of the conventional cap, the height of the cap rubber ring is higher than that of the conventional cap, the end height of the steel shell groove is higher than that of the conventional battery, and the long length of the steel shell edge after sealing forms an effective negative terminal, which can achieve the requirement of welding the positive and negative electrodes on the same side of the grooved sealing structure battery in the PACK application; and the long length of the steel shell edge effectively increases the sealing area, thereby effectively improving the leakage abnormality. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 Schematic diagram of the positive electrode lead-in terminal and the negative electrode lead-in terminal in the present invention; Figure 3 It is a schematic diagram of the structure of the rolling groove end height in the present invention; Figure 4 It is a schematic diagram of the structure of the cap explosion-proof plate and the cap rubber ring in the present invention; Figure 5 It is a schematic diagram of the structure of the PACK connecting piece in the present invention; Figure 6 This is a structural diagram of a small module welded on the same side of a battery with a grooved sealing structure in the present invention.

[0013] In the figure: 1. Groove seal; 2. Cap; 3. Steel shell; 4. Groove end height; 5. Cap explosion-proof plate; 6. Cap rubber ring; 7. PACK connecting piece; 8. Module. DETAILED DESCRIPTION

[0014] The present invention will be further explained below in conjunction with specific embodiments. Example

[0015] Reference Figure 1-6 As shown, the present invention proposes a large cylindrical battery with a rolling groove sealing structure that can be PACKed on the same side and welded, comprising multiple battery bodies and a module 8, wherein the battery body is provided with a rolling groove sealing 1, a cap 2, a steel shell 3, a rolling groove end height 4, a cap explosion-proof piece 5, a cap rubber ring 6, and a PACK connecting piece 7, wherein the steel shell 3 is wrapped around the outside of the battery body, the cap 2 is located at the top of the steel shell 3, the cap explosion-proof piece 5 is located on the inside of the steel shell 3, the rolling groove end height 4 is located at the outside top of the rolling groove sealing 1, the cap rubber ring 6 is located on the inside of the rolling groove end height 4, and the PACK connecting piece 7 is located on the top of multiple battery bodies and is welded to multiple battery bodies.

[0016] In this embodiment, the top plane of the steel shell 3 is the negative electrode lead-out terminal, the top cover of the cap 2 is the positive electrode lead-out terminal, the height of the groove end height 4 is higher than the height of the conventional grooved battery end, the edge length of the cap explosion-proof plate 5 is longer than the length of the ordinary cap edge, the height of the cap rubber ring 6 is higher than the height of the ordinary cap rubber ring 6, the length of the negative electrode lead-out terminal of the battery body is longer than the length of the ordinary grooved sealed battery edge, in the welding of the PACK connecting piece 7, the welding area is effectively increased to realize the same-side welding of the grooved sealing structure battery, and the sealed shell The long edging length can increase the sealing tightness and improve the leakage abnormality. The material of the PACK connecting piece 7 is nickel or copper-plated nickel sheet, and is designed to have a height difference between the positive electrode welding point and the negative electrode welding point, which is convenient for welding the positive and negative electrodes on the same side. The module 8 is a rolling groove sealing structure battery that adopts the positive and negative electrodes on the same side welding, which can realize the technology of CTC vehicle chassis flat battery. The welding method of the PACK connecting piece 7 and the battery body adopts laser welding. Compared with welding on the opposite side, welding the negative electrode lead-out end will not cause leakage compared to welding the shell bottom.

[0017] The process of the present invention is as follows: S1. The battery groove, the height of the groove end is 4 higher than the conventional battery end, forming a groove end height of 4; S2. After the battery is baked, injected, and welded after the groove is rolled, the height of the cap rubber ring 6 is higher than that of the ordinary cap rubber ring 6, and the edge length of the cap explosion-proof plate 5 is longer than that of the ordinary cap edge length; S3. The cap 2 is inserted into the steel shell 3, and the battery body is mechanically stamped and sealed. After sealing, the edge length of the steel shell 3 is longer than that of an ordinary battery, forming a negative terminal, and the top cover of the cap 2 is a positive terminal; S4. After sealing, the battery body is cleaned, dried, oiled, heat-shrunk, printed, aged, pre-charged, aged, divided into different capacities, sorted, and offline; S5. Select batteries with the same consistency and use the PACK connecting piece 7 to weld the positive and negative electrodes on the same side to make a module 8.

[0018] In the present embodiment, the grooved sealed battery has a long edge length of the steel shell 3 after mechanical stamping sealing, forming an effective welding area. The plane of the edge of the steel shell 3 serves as the lead-out terminal of the negative electrode, and the top cover of the cap 2 serves as the lead-out terminal of the positive electrode. When making the PACK connecting piece 7, the requirement of welding the positive and negative electrodes on the same side can be realized. The existing large cylindrical batteries that can achieve welding of the positive and negative electrodes on the same side are all laser welded sealed batteries. Compared with batteries sealed by laser welding, this battery has the advantages of simple and mature process, low equipment investment cost, and high yield rate. In addition, the long edge length of the battery of this invention effectively increases the sealing area of ​​the seal, has better sealing than conventional grooved sealed batteries, and improves the abnormal leakage of the seal.

[0019] The test data in this embodiment is as follows: 1. The dimensions of the battery cell after groove rolling are: end height 10.6mm, groove width 1.3mm, bottom height 128.7mm, total height 140.6mm, inner diameter φ35.3mm, outer diameter φ40mm; 2. The height of the cap rubber ring 6 is 9.5mm, the edge length of the steel shell 3 is 6.2mm, the outer diameter is φ39.4mm, and the height of the steel shell 3 is 5.6mm; 3. After rolling the groove, the battery cell is baked, liquid is injected, and the cap is welded. The handle is extended to bend the cap into the shell; 4. The battery is mechanically stamped and the cap rubber ring 6 is compressed to seal it. After sealing, the edge length of the steel shell 3 is 7mm as the negative electrode lead-out terminal of the battery, and the battery height is 135mm; 5. The material of the PACK connecting piece 7 is pure copper plated with nickel, with a thickness of 1 mm. The size of the PACK connecting piece 7 is designed according to the number of series and parallel connections.

[0020] 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 large cylindrical battery with a PACKable same-side welded rolling groove sealing structure, comprising a plurality of battery bodies and modules (8), characterized in that: The battery body is provided with a rolling groove seal (1), a cap (2), a steel shell (3), a rolling groove end height (4), a cap explosion-proof plate (5), a cap rubber ring (6), and a PACK connecting plate (7); the steel shell (3) is wrapped around the outside of the battery body; the cap (2) is located on the top of the steel shell (3); the cap explosion-proof plate (5) is located on the inside of the steel shell (3); the rolling groove end height (4) is located on the outside top of the rolling groove seal (1); the cap rubber ring (6) is located on the inside of the rolling groove end height (4); and the PACK connecting plate (7) is located on the top of a plurality of battery bodies and is welded to the plurality of battery bodies.

2. A large cylindrical battery with a PACKable same-side welding groove sealing structure according to claim 1, characterized in that: The top plane of the steel shell (3) is the negative electrode lead-out terminal.

3. A large cylindrical battery with a PACKable same-side welding groove sealing structure according to claim 1, characterized in that: The top cover of the cap (2) is the positive electrode lead-out terminal.

4. A large cylindrical battery with a PACKable same-side welding groove sealing structure according to claim 1, characterized in that: The PACK connecting piece (7) and the battery body are welded by laser welding.

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