Top cover assembly and top cover welding assembly

Abstract

A top cover welding assembly belongs to the technical field of battery structures and comprises a top cover piece and a welding ring, the top cover piece is provided with a top cover piece welding influence area, and the welding ring is provided with a welding ring welding influence area; a stress releasing structure is arranged in the welding ring welding influence area and / or the top cover piece welding influence area and used for releasing stress generated when the top cover and the welding ring are welded. The utility model further provides a top cover assembly, and the pole is fixed through the top cover welding assembly. According to the top cover welding assembly, the stress releasing structure is arranged on the top cover piece or the welding ring or the top cover piece and the welding ring at the same time, stress can be released through the stress releasing structure in the welding process, in this way, the stress cannot cause weld joint cracking, and the welding quality is improved. Therefore, the problem that the weldment of the traditional aluminum shell battery top cover assembly is easy to crack during welding is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery structure technical field, more specifically, especially relate to a top cover subassembly and a top cover welding subassembly. BACKGROUND

[0002] In the assembly of the top cover structure of the existing aluminum shell battery, the pole, the welding ring, the top cover sheet, the sealing ring, the plastic part and the like are assembled first, and then welded and fixed. The welding ring and the top cover sheet are fusedly welded. Due to the uneven temperature field acting on the welding part during the welding process, there is a large residual stress in the welding seam and its heat-affected zone, so that the welding part is prone to cracking.

[0003] Under normal circumstances, the sealing ring is under pressure, and the welding seam will be subjected to the elastic force brought by the sealing ring. When the crack is large, the structure at this position loses stability, so that the sealing ring is unevenly distributed under pressure, thereby causing the sealing failure of the top cover sheet and greatly reducing the yield. When the crack is small, the failure cannot be identified by helium detection and other measures in the short term, but the failure gradually appears during the long-term cycling of the battery, and the battery also has the risk of liquid leakage, thereby reducing the service life of the battery. UTILITY MODEL CONTENTS

[0004] (I) Technical problem

[0005] As described above, how to solve the problem that the welding part of the traditional aluminum shell battery top cover sheet is prone to welding cracking has become a problem to be solved by those skilled in the art.

[0006] (II) Technical scheme

[0007] In order to achieve the above purpose, the utility model provides the following technical scheme:

[0008] The utility model provides a top cover welding subassembly, in the utility model, the top cover welding subassembly includes top cover sheet and welding ring, the top cover sheet is connected with the welding ring, there is welding seam between the top cover sheet and the welding ring, the position of the top cover sheet close to the welding seam is the top cover sheet welding influence area, the position of the welding ring close to the welding seam is the welding ring welding influence area, stress release structure is arranged in the welding ring welding influence area and / or the top cover sheet welding influence area, and is used for releasing the stress generated when the top cover and the welding ring are welded.

[0009] Preferably, in the top cover welding subassembly provided by the utility model, the stress release structure is a groove structure.

[0010] Preferably, in the top cover welding subassembly provided by the utility model, the cross section of the stress release structure is a rectangular structure, a curved surface structure or a trapezoidal structure.

[0011] Preferably, in the top cover welding assembly provided by the utility model, the top cover sheet welding influence area is a ring area structure; the welding ring welding influence area is a ring area structure.

[0012] Preferably, in the top cover welding assembly provided by the utility model, the stress release structure is a ring groove, and the stress release structure is concentric with the top cover sheet welding influence area when the stress release structure is arranged in the top cover sheet welding influence area; and / or the stress release structure is a ring groove, and the stress release structure is concentric with the welding ring welding influence area when the stress release structure is arranged in the welding ring welding influence area.

[0013] Preferably, in the top cover welding assembly provided by the utility model, the stress release structure is an arc-shaped groove, and the stress release structure is concentric with the top cover sheet welding influence area when the stress release structure is arranged in the top cover sheet welding influence area; and / or the stress release structure is an arc-shaped groove, and the stress release structure is concentric with the welding ring welding influence area when the stress release structure is arranged in the welding ring welding influence area.

[0014] Preferably, in the top cover welding assembly provided by the utility model, a plurality of stress release structures are arranged, and the plurality of stress release structures are arranged at equal intervals around the center of the top cover sheet welding influence area when the stress release structures are arranged in the top cover sheet welding influence area; and / or a plurality of stress release structures are arranged, and the plurality of stress release structures are arranged at equal intervals around the center of the welding ring welding influence area when the stress release structures are arranged in the welding ring welding influence area.

[0015] Preferably, in the top cover welding assembly provided by the utility model, the stress release structure is arranged at intervals between the stress release structure and the welding seam; and / or the top cover sheet is an aluminum sheet.

[0016] Preferably, in the top cover welding assembly provided by the utility model, the stress release structure is integrally formed with the top cover sheet when the stress release structure is arranged on the top cover sheet; and / or the stress release structure is integrally formed with the welding ring when the stress release structure is arranged on the welding ring.

[0017] The utility model also provides a top cover assembly, the top cover assembly includes top cover welding assembly and pole, the top cover welding assembly is above-mentioned top cover welding assembly, the pole is provided with plastic piece on the pole body, the top cover welding assembly includes top cover sheet and welding ring, the top cover sheet is provided with pole hole, the pole body is arranged in the pole hole, the welding ring is sleeved on the pole body and fixes the plastic piece assembly on the upside of the top cover sheet.

[0018] (Three) beneficial effects

[0019] As described above, the top cover welding assembly provided by this utility model includes a top cover sheet and a welding ring. The top cover sheet has a welding influence zone, and the welding ring has a welding influence zone. Stress relief structures are provided in the welding influence zones of the welding ring and / or the top cover sheet to release stress generated during welding between the top cover and the welding ring. This utility model also provides a top cover assembly, through which the terminal post is fixed. In the top cover welding assembly provided by this utility model, stress relief structures are provided on the top cover sheet, or on the welding ring, or simultaneously on both the top cover sheet and the welding ring. During welding, stress is released through the stress relief structures, thus preventing weld cracking and solving the problem of easy welding cracking in traditional aluminum-cased battery top covers. Attached Figure Description

[0020] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. Wherein:

[0021] Figure 1 This is an exploded view of the top cover assembly in an embodiment of the present invention;

[0022] Figure 2 This is a partial structural schematic diagram of the top cover assembly in one embodiment of the present utility model;

[0023] Figure 3 This is a partial structural diagram of the top cover assembly in another embodiment of the present invention.

[0024] exist Figure 2 The stress relief structure is set on the welding ring, in Figure 3 The stress relief structure is installed on the top cover plate.

[0025] exist Figures 1 to 3 In the diagram, the correspondence between component names and reference numerals is as follows:

[0026] 1. Top cover plate; 2. Welding ring; 3. Pole post; 4. Stress relief structure; 5. Welding affected area of ​​top cover plate; 6. Weld seam; 7. Plastic part; 8. Detailed Implementation

[0027] The utility model will be described below in detail with reference to the drawings and in conjunction with the embodiments. Each example is provided by way of illustration of the utility model and does not limit the utility model. In fact, those skilled in the art will clearly understand that modifications and variations can be made in the utility model without departing from the scope or spirit of the utility model. For example, features shown as or described as part of one embodiment can be used in another embodiment to produce yet another embodiment. Therefore, it is expected that the utility model includes such modifications and variations within the scope of the appended claims and their equivalents.

[0028] In the description of the utility model, the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and does not require the utility model to be necessarily constructed and operated in a particular orientation, so it cannot be understood as a limitation on the utility model. The terms "connected", "connected" used in the utility model should be understood broadly, for example, it can be fixed connection, but also can be detachable connection; it can be directly connected, but also indirectly connected through intermediate parts, and those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0029] Please refer to Figures 1 to 3 , wherein, Figure 1 It is the explosion structure schematic view of the top cover assembly in the embodiment of the utility model; Figure 2 It is the partial structure schematic view of the top cover assembly in one embodiment of the utility model; Figure 3 It is the partial structure schematic view of the top cover assembly in another embodiment of the utility model.

[0030] The utility model provides a kind of top cover welding assembly, including top cover sheet 1 and welding ring 2, top cover sheet 1 is the plate profile of aluminium, be provided with pole hole (pole hole is provided with two) on top cover sheet 1, the top cover welding assembly provided by the utility model is used to realize the fixed installation of pole 3 on top cover sheet pole hole.Further, pole 3 is riveted on pole hole by plastic piece 8, sealing ring and so on structure, then realizes welding fixation on top cover sheet 1 by welding ring 2.Specifically, the cylinder of pole 3 is provided with ring structure, plastic piece 8 is sleeved to the cylinder of pole 3 and is assembled together with ring structure, pole 3 and plastic piece 8 are installed to top cover sheet 1, welding ring 2 is also provided on the cylinder of pole 3, welding ring 2 fixes plastic piece 8 to the upper side of top cover sheet 1 to realize the fixation of pole 3 on top cover sheet 1.

[0031] Specifically, the top cover sheet 1 and the welding ring 2 (the welding ring 2 is a circular ring structure, the pole hole is a circular hole structure, and the welding ring 2 is coaxially arranged with the pole hole when arranged on the top cover sheet 1) are welded and connected, the top cover sheet 1 is provided with an annular groove around the pole hole, the welding ring 2 can be fitted in the annular groove, and a welding seam 7 is formed between the outer edge of the welding ring 2 and the inner annular surface of the annular groove. In order to facilitate the structural description, it is defined herein that the position of the top cover sheet 1 close to the welding seam 7 is a top cover sheet welding affected area 5, and the position of the welding ring 2 close to the welding seam 7 is a welding ring welding affected area 6. The top cover sheet welding affected area 5 and the welding ring welding affected area 6 are both circular ring structures coaxial with the pole hole.

[0032] In the prior art, after the welding ring and the top cover sheet are welded, the welding ring or the top cover sheet will have a tendency to deform under the influence of stress, which will cause the welding seam to crack. In order to solve this problem, the utility model proposes the following structural improvement: a stress release structure 4 is arranged on the welding ring welding affected area 6 and / or the top cover sheet welding affected area 5, which is used for releasing the stress generated by the welding of the top cover (specifically the top cover sheet 1) and the welding ring 2. In the utility model, the stress release structure 4 is a groove structure. The stress release structure 4 is arranged on the top cover sheet 1, or on the welding ring 2, or on both the top cover sheet 1 and the welding ring 2. During welding, the stress will be released through the stress release structure 4 (the specific release form is to cause the deformation of the stress release structure 4), and because a large amount of stress is released during the welding process, the residual stress will not cause the welding seam 7 to crack after the welding is completed, thereby solving the problem that the welding part of the traditional top cover sheet of the aluminum shell battery is prone to welding cracking.

[0033] As can be seen from the above, the stress release structure 4 is a groove structure arranged on the welding ring welding affected area 6 and / or the top cover sheet welding affected area 5. Specifically, the cross section of the stress release structure 4 is a rectangular structure, a curved surface structure or a trapezoidal structure, and the cross section shape of the stress release structure 4 is preferably a rectangular structure, that is, the cross section shape of the stress release structure 4 is a "N" shape.

[0034] In the prior art, the pole hole arranged on the top cover sheet is a circular hole structure, therefore, in the utility model, the welding ring 2 is preferably a circular ring structure, and the welding ring 2 is coaxially arranged with the pole hole when fixed on the top cover sheet 1. Based on this structural design, in the utility model, the top cover sheet welding affected area 5 is an annular area structure, and the welding ring welding affected area 6 is an annular area structure.

[0035] Further, the stress release structure 4 is an annular groove (that is, the overall shape of the stress release structure 4 is annular), which is preferably a circular ring groove, and the stress release structure 4 is concentric with the top cover sheet welding affected area 5 when arranged on the top cover sheet welding affected area 5. Alternatively, the stress release structure 4 is an annular groove, which is preferably a circular ring groove, and the stress release structure 4 is concentric with the welding ring welding affected area 6 when arranged on the welding ring welding affected area 6.

[0036] In the above embodiment, the stress release structure 4 is an annular groove, in other embodiments of the present application, the stress release structure 4 is an arc-shaped groove, and when the stress release structure 4 is arranged in the top cover sheet welding affected area 5, the stress release structure 4 is concentric with the top cover sheet welding affected area 5, or when the stress release structure 4 is arranged in the welding ring welding affected area 6, the stress release structure 4 is concentric with the welding ring welding affected area 6. Further, the stress release structure 4 is provided with a plurality of (i.e. provided with a plurality of on the same welding ring 2, or provided with a plurality of corresponding to the same pole hole on the top cover sheet 1, and the number of settings can be 2, 3, 4, 5, 6, 7, 8 or 9), and when the stress release structure 4 is arranged in the top cover sheet welding affected area 5, the plurality of stress release structures 4 are arranged at equal intervals around the center of the top cover sheet welding affected area 5; or, the stress release structure 4 is provided with a plurality of (the number of settings can be 2, 3, 4, 5, 6, 7, 8 or 9), and when the stress release structure 4 is arranged in the welding ring welding affected area 6, the plurality of stress release structures 4 are arranged at equal intervals around the center of the welding ring welding affected area 6.

[0037] Of course, in other embodiments of the present application, the stress release structure 4 can also be a small circular hole structure, and the stress release structure 4 is provided with a plurality of (the number of settings can be 2, 3, 4, 5, 6, 7, 8 or 9), and when the stress release structure 4 is arranged in the top cover sheet welding affected area 5, the plurality of stress release structures 4 are arranged at equal intervals around the center of the top cover sheet welding affected area 5, or when the stress release structure 4 is arranged in the welding ring welding affected area 6, the plurality of stress release structures 4 are arranged at equal intervals around the center of the welding ring welding affected area 6.

[0038] When the stress release structure 4 is provided with a plurality of stress release structures, the stress release structures 4 have a spacing therebetween.

[0039] When the stress release structure 4 is arranged on the top cover sheet 1 or the welding ring 2, the stress release structure 4 is arranged at intervals with the weld 7 (the stress release structure 4 has a certain distance from the weld 7, and the distance is not less than one time the width of the stress release structure 4, and the optimal distance is 1.5-3 times the width of the stress release structure 4).

[0040] In order to ensure the structural strength of the top cover sheet 1 or the welding ring 2, when the stress release structure 4 is arranged on the top cover sheet 1, the stress release structure 4 is integrally formed with the top cover sheet 1; and when the stress release structure 4 is arranged on the welding ring 2, the stress release structure 4 is integrally formed with the welding ring 2.

[0041] The stress release structure 4 has two setting modes: 1, the stress release structure 4 is a groove structure, and the stress release structure 4 is arranged on the welding ring 2, and specifically, the stress release structure 4 is annularly distributed along the welding edge of the welding ring 2; and 2, the stress release structure 4 is a groove structure, and the stress release structure 4 is arranged on the top cover sheet 1, and specifically, the stress release structure 4 is annularly distributed along the welding edge of the top cover sheet 1; and stress is released due to the outside opening of the welding position during welding.

[0042] The utility model also provides a kind of top cover assembly, belong to one of the composition structure of aluminum battery, the utility model is fixed on the top cover assembly by above-mentioned top cover welding assembly pole 3, specifically by setting plastic piece 8 on pole 3, then by welding ring 2, plastic piece 8 is fixed on top cover sheet 1, to realize the fixed installation of pole 3 on top cover sheet 1. Through the structural design of the top cover welding assembly, when welding ring 2 and top cover sheet 1 are welded, the stress generated during welding is released by stress release structure 4 (specific release form is the deformation of stress release structure 4), so stress will not cause weld 7 cracking, to solve the welding cracking problem prone to occur in the welding part of the traditional aluminum shell battery top cover sheet.

[0043] The utility model provides a top cover assembly, including top cover sheet 1, pole 3, plastic piece 8 (including upper plastic and lower plastic) sealing ring, welding ring 2, wherein pole 3 and plastic piece 8 are integrally injection-molded structure, sealing ring is sleeved on pole 3, and located between pole 3 and top cover sheet 1, welding ring 2 is sleeved on the outside of pole 3, is accommodated in the groove on top cover sheet 1, and welding ring 2 and top cover sheet 1 are integrally assembled by laser welding, the utility model discloses ring-shaped groove (stress release structure 4) that can release stress is set on top cover sheet and / or welding ring 2, to solve the welding crack problem in the prior art.

[0044] The above is only preferred embodiment of the utility model, and is not used to limit the utility model, for the person skilled in the art, the utility model can have various changes and changes. Any modification, equivalent replacement, improvement etc. that is made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1.A top cover welding assembly, characterized in that, a top cover sheet and a welding ring are welded together, a weld seam is formed between the top cover sheet and the welding ring, a top cover sheet welding affected area is formed on the top cover sheet near the weld seam, and a welding ring welding affected area is formed on the welding ring near the weld seam; a stress release structure is arranged in the welding ring welding affected area and / or the top cover sheet welding affected area to release the stress generated when the top cover and the welding ring are welded. 2.The top cover welding assembly according to claim 1, characterized in that, the stress release structure is a groove structure. 3.The top cover welding assembly according to claim 2, characterized in that, the stress release structure has a rectangular structure, a curved surface structure or a trapezoidal structure in cross section. 4.The top cover welding assembly according to claim 2, characterized in that, the top cover sheet welding affected area has a ring-shaped area structure; the welding ring welding affected area has a ring-shaped area structure. 5.The top cover welding assembly according to claim 4, characterized in that, the stress release structure is a ring-shaped groove, and when the stress release structure is arranged in the top cover sheet welding affected area, the stress release structure is concentric with the top cover sheet welding affected area; and / or, the stress release structure is a ring-shaped groove, and when the stress release structure is arranged in the welding ring welding affected area, the stress release structure is concentric with the welding ring welding affected area. 6.The top cover welding assembly according to claim 4, characterized in that, the stress release structure is an arc-shaped groove, and when the stress release structure is arranged in the top cover sheet welding affected area, the stress release structure is concentric with the top cover sheet welding affected area; and / or, the stress release structure is an arc-shaped groove, and when the stress release structure is arranged in the welding ring welding affected area, the stress release structure is concentric with the welding ring welding affected area. 7.The top cover welding assembly according to claim 6, characterized in that, a plurality of stress release structures are arranged, and when the stress release structures are arranged in the top cover sheet welding affected area, the plurality of stress release structures are arranged at equal intervals around the center of the top cover sheet welding affected area; and / or, a plurality of stress release structures are arranged, and when the stress release structures are arranged in the welding ring welding affected area, the plurality of stress release structures are arranged at equal intervals around the center of the welding ring welding affected area. 8.The top cover welding assembly according to claim 1, characterized in that, the stress release structure is arranged at a distance from the weld seam; and / or the top cover sheet is an aluminum sheet. 9.The top cover welding assembly according to any one of claims 1 to 8, characterized in that, when the stress release structure is arranged on the top cover sheet, the stress release structure is integrally formed with the top cover sheet; and / or, when the stress release structure is arranged on the welding ring, the stress release structure is integrally formed with the welding ring. 10.A top cover assembly, characterized in that, a top cover welding assembly and a pole are included, and the top cover welding assembly is the top cover welding assembly according to any one of claims 1 to 9. The pole body of the pole is provided with a plastic part, the top cover welding assembly comprises a top cover sheet and a welding ring, the pole hole is arranged on the top cover sheet, the pole body of the pole is arranged in the pole hole, and the welding ring is sleeved on the pole body of the pole and fixedly arranged with the plastic part on the upper side of the top cover sheet.

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