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

Abstract

The utility model discloses a PACK same-side welding 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 sealing opening, 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 positioned at the top of the steel shell, and the PACK connecting sheet is positioned 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 rolling groove of the steel shell 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 utility model relates to big cylindrical battery technical field especially relates to a big cylindrical battery of PACK same side welding groove sealing structure. BACKGROUND

[0002] The existing CTC chassis flat battery technology needs single cell to have the requirement of positive and negative electrode same side welding, and the big cylindrical battery that can satisfy the positive and negative electrode same side welding in the market is the laser welding seal, and the bottom of the battery steel shell is used as the negative electrode, and the aluminum rivet at the bottom of the shell is used as the positive electrode to realize the positive and negative electrode same side welding. SUMMARY

[0003] Based on the technical problems existing in the background technology, the utility model provides a big cylindrical battery of PACK same side welding groove sealing structure, the length of the steel shell edge after mechanical stamping sealing is long, the effective welding area is formed, the plane of the steel shell edge is used as the lead-out end of the negative electrode, the top cover of the cap is used as the lead-out end of the positive electrode, and the requirement of positive and negative electrode same side welding can be realized when the PACK is made.

[0004] The big cylindrical battery of PACK same side welding groove sealing structure provided by the utility model comprises a plurality of battery main bodies and modules, the battery main body is provided with a groove sealing structure, a cap, a steel shell, a groove end height, a cap explosion-proof piece, a cap rubber ring and a PACK connecting piece, the steel shell is wrapped on the outer side of the battery main body, the cap is located at the top of the steel shell, the cap explosion-proof piece is located on the inner side of the steel shell, the groove end height is located at the top of the outer side of the groove sealing structure, the cap rubber ring is located on the inner side of the groove end height, and the PACK connecting piece is located at the top of the plurality of battery main bodies and is welded and connected with the plurality of battery main bodies.

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

[0006] Preferably, the height of the groove end height is higher than the height of the end of the conventional groove battery, the length of the edge of the cap explosion-proof piece is longer than the length of the edge of the ordinary cap, and the height of the cap rubber ring is higher than the height of the ordinary cap rubber ring.

[0007] Preferably, the length of the negative electrode lead-out end of the battery body is longer than the length of the edge of the general roll groove sealing battery, and in the welding of the PACK connecting piece, the welding area is effectively increased to realize the same side welding of the roll groove sealing structure battery, and the length of the edge of the sealed shell body is long, which can increase the sealing property of the sealing and improve the abnormality of liquid leakage.

[0008] Preferably, the material of the PACK connecting piece is nickel or copper-nickel plated piece, and the PACK connecting piece is designed as a structure with a height difference between the positive electrode welding position and the negative electrode welding position, so that the same side welding of the positive electrode and the negative electrode is facilitated.

[0009] Preferably, the module is a roll groove sealing structure battery which adopts the same side welding of the positive electrode and the negative electrode, and the technology of the CTC vehicle chassis flat battery can be realized.

[0010] Preferably, the welding method of the PACK connecting piece and the battery body adopts laser welding, and compared with the opposite side welding, the welding of the negative electrode lead-out end will not cause the welding through liquid leakage compared with the welding of the shell bottom.

[0011] In the utility model, the length of the edge of the cap explosion-proof piece 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 roll groove is higher than that of the conventional battery, and the length of the edge of the sealed steel shell is long to form an effective negative electrode end, so that the requirement of the same side welding of the positive electrode and the negative electrode of the roll groove sealing structure battery in the PACK application can be realized, and the length of the edge of the steel shell is long to effectively increase the sealing area, so that the abnormality of liquid leakage is effectively improved. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is a whole structure schematic view of the utility model;

[0013] Figure 2 It is a schematic view of the positive electrode lead-out end and the negative electrode lead-out end in the utility model;

[0014] Figure 3 It is a structure schematic view of the roll groove end height in the utility model;

[0015] Figure 4 It is a structure schematic view of the cap explosion-proof piece and the cap rubber ring in the utility model;

[0016] Figure 5 It is a structure schematic view of the PACK connecting piece in the utility model;

[0017] Figure 6 It is a small module structure view of the same side welding of the roll groove sealing structure battery in the utility model.

[0018] In the drawing: 1, roll groove sealing; 2, cap; 3, steel shell; 4, roll groove end height; 5, cap explosion-proof piece; 6, cap rubber ring; 7, PACK connecting piece; 8, module. DETAILED DESCRIPTION

[0019] The utility model is further explained below in combination with specific embodiments. Embodiments

[0020] Referring to Figures 1-6 The utility model provides a big cylindrical battery of PACK same side welding groove sealing structure, including a plurality of battery main part and module 8, be equipped with groove sealing 1, cap 2, steel shell 3, groove end high 4, cap explosion -proof piece 5, cap rubber ring 6, PACK connecting piece 7 on the battery main part, the steel shell 3 is wrapped in the outside of battery main part, cap 2 is located at the top of steel shell 3, cap explosion -proof piece 5 is located at the inside of steel shell 3, groove end high 4 is located at the outside top of groove sealing 1, cap rubber ring 6 is located at the inside of groove end high 4, the PACK connecting piece 7 is located at the top of a plurality of battery main part and is connected with a plurality of battery main part welding.

[0021] In this embodiment, the top plane of the steel shell 3 is the negative electrode lead-out end, the top cover of the cap 2 is the positive electrode lead-out end, the height of the groove end high 4 is higher than the height of the conventional groove battery end, the length of the cap explosion-proof piece 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, and the length of the negative electrode lead-out end of the battery main body is longer than the length of the ordinary groove sealing 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 groove sealing structure battery, and the length of the sealing shell edge is long, which can increase the sealing performance and improve the abnormality of liquid leakage. The material of the PACK connecting piece 7 is nickel or copper-nickel plated sheet, and the design is a structure with a height difference between the positive electrode welding position and the negative electrode welding position, which facilitates the same side welding of the positive and negative electrodes. The module 8 is a groove sealing structure battery that uses the same side welding of the positive and negative electrodes, which can realize the CTC vehicle chassis flat battery technology. The welding method of the PACK connecting piece 7 and the battery main body is laser welding, which is better than the opposite side welding. Compared with welding the shell bottom, welding the negative electrode lead-out end will not cause the welding to leak.

[0022] The process of the utility model is as follows:

[0023] S1. Battery groove, the height of the groove end high 4 is higher than that of the conventional battery end, forming the groove end high 4;

[0024] S2. After the battery groove, the battery is baked, liquid is injected, and the cap is welded. The height of the cap rubber ring 6 is higher than that of the ordinary cap rubber ring 6, and the length of the cap explosion-proof piece 5 is longer than that of the ordinary cap edge.

[0025] S3. Cap 2 into steel shell 3, battery main body carries out mechanical stamping sealing, the length of the sealing steel shell 3 edge is longer than that of the ordinary battery edge, forming the negative electrode lead-out end, and the top cover of the cap 2 is the positive electrode lead-out end.

[0026] S4. After sealing, the battery body is cleaned, dried, oiled, heat-shrunk, coded, aged, pre-charged, aged, sorted, and discharged.

[0027] S5. Select the same consistency battery to use PACK connecting piece 7 to make module 8 by welding the positive and negative electrodes on the same side.

[0028] In this embodiment, the mechanical stamping of the roll groove sealed battery forms a long steel shell 3 edge length, which forms an effective welding area. The plane of the steel shell 3 edge is used as the negative electrode lead-out end, and the top cover of the cap 2 is used as the positive electrode lead-out end. When making the PACK connecting piece 7, the positive and negative electrodes can be welded on the same side. The existing large cylindrical battery that can realize the welding of the positive and negative electrodes on the same side is a laser welding sealed battery. Compared with the laser welding sealed battery, this battery has the advantages of simple and mature process, low equipment investment cost, and high yield. The battery edge length of this utility model effectively increases the sealing area of the seal, and the sealing performance is better than that of the conventional roll groove sealed battery. The abnormality of the seal leakage is improved.

[0029] The test data in this embodiment are as follows:

[0030] 1. After the roll groove of the battery cell, the size is as follows: end height 10.6mm, groove width 1.3mm, bottom height 128.7mm, total height 140.6mm, inner diameter φ35.3mm, and outer diameter φ40mm;

[0031] 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;

[0032] 3. After the roll groove, the battery cell is baked, injected, and welded with the cap, and the extended handle is bent to fold the cap into the shell;

[0033] 4. The battery is mechanically stamped, the cap rubber ring 6 is compressed to seal, the edge length of the steel shell 3 after sealing is 7mm, which is used as the negative electrode lead-out end of the battery, and the height of the battery is 135mm;

[0034] 5. The material of the PACK connecting piece 7 is pure copper plated with nickel, the thickness is 1mm, and the size of the PACK connecting piece 7 is designed according to the number of series and parallel connections.

[0035] The above is only a preferred specific implementation of the present utility model, but the protection scope of the present utility model is not limited to this. Any skilled person in the technical field can make equivalent replacement or change according to the technical scheme and the utility model concept of the present utility model within the technical range disclosed by the present utility model, which should be covered within the protection scope of the present utility model.

Claims

1. A large cylindrical battery of a structure that can be PACKed and side-welded with a roll groove seal, 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 high (4), a cap explosion-proof piece (5), a cap rubber ring (6), and a PACK connecting piece (7). The steel shell (3) is wrapped on the outer side 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 inner side of the steel shell (3), the rolling groove end high (4) is located at the top of the outer side of the rolling groove seal (1), the cap rubber ring (6) is located on the inner side of the rolling groove end high (4), and the PACK connecting piece (7) is located at the top of the plurality of battery bodies and is welded to the plurality of battery bodies.

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

3. The large cylindrical battery with a PACK homolateral welding groove sealing structure according to claim 1, characterized in that, The top cover of the cap (2) is a positive electrode lead-out end.

4. The large cylindrical battery with a PACK homolateral welding groove sealing structure according to claim 1, characterized in that, The welding method of the PACK connecting piece (7) and the battery body is laser welding.

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