Top cover structure without polar column

Abstract

The utility model discloses a pole-free top cover structure. The pole-free top cover structure comprises a light aluminum sheet body; the two sides of the light aluminum sheet body are provided with an external connection boss and two internal connection bosses respectively. An external palladium sheet is welded and mounted on one side of the external boss; and an internal tab is welded and mounted on one side of the internal connection boss. According to the pole-free top cover structure provided by the utility model, the external connection boss and the internal connection boss are respectively arranged on the front side and the back side of the smooth aluminum sheet body, and are respectively and directly connected with an external palladium sheet and an internal tab, so that a positive aluminum block, positive upper plastic, a sealing ring and a positive pole structure are omitted, and the cost is reduced. The whole top cover is simpler in structure, the cost is reduced, the top cover is convenient to assemble, and the stability of the top cover is improved to a certain extent.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery technology, and in particular to a terminalless top cover structure. Background Technology

[0002] Currently, lithium battery top covers on the market typically have positive and negative terminals on both sides of the aluminum sheet, serving as two output terminals. These terminals connect internally to the tabs and externally to the environment via a palladium plate, enabling charging and discharging. (See attached image.) Figure 1 As shown, it includes a positive aluminum block 201, a positive upper plastic 202, a light aluminum sheet 203, a sealing ring 204, a positive electrode post 205, and a positive lower plastic 206. The negative terminal is arranged similarly.

[0003] The lithium battery top cover with this structure has terminals for both the positive and negative electrodes, which results in high manufacturing costs and complex production processes. During the cell production process, the high temperature can damage the seal of the plastic and the sealing ring, leading to a decrease in product reliability.

[0004] Therefore, it is necessary to provide a non-polar column top cover structure to solve the above-mentioned technical problems. Utility Model Content

[0005] In view of the above situation and to overcome the defects of the existing technology, this utility model provides a columnless top cover structure that can simplify the top cover structure, reduce costs, and improve reliability.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] The electrodeless top cover structure includes: an aluminum sheet body, with an external boss and two internal bosses respectively provided on both sides of the aluminum sheet body, an external palladium sheet welded to one side of the external boss, and an internal electrode tab welded to one side of the internal boss.

[0008] Preferably, the external boss is square or round.

[0009] Preferably, the inner boss is square or circular.

[0010] Preferably, the external boss and the aluminum sheet body are integrally stamped.

[0011] Preferably, the inner boss and the aluminum sheet body are integrally stamped.

[0012] Preferably, the external boss is located between the two internal bosses.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] (1) The present invention provides an external boss and an internal boss on the front and back sides of the aluminum sheet body respectively. The external boss and the internal boss are directly connected to the external palladium sheet and the internal electrode tab respectively, eliminating the positive electrode aluminum block, positive electrode plastic, sealing ring and positive electrode column structure, making the structure of the entire top cover simpler, reducing cost, facilitating assembly, and improving the stability of the top cover to a certain extent.

[0015] (2) By setting the external boss and internal boss formed by stamping, this utility model can simplify the process flow, facilitate production, and improve production efficiency. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the exploded structure of the existing roof cover;

[0017] Figure 2 An exploded structural diagram of the infinite column top cover structure provided by this utility model;

[0018] Figure 3 for Figure 1 The diagram shows the structure of the aluminum sheet in the infinite column top cover structure.

[0019] The corresponding names of the attached figures are: 100-aluminum sheet body, 101-external boss, 102-internal boss, 201-positive aluminum block, 202-positive upper plastic, 203-aluminum sheet, 204-sealing ring, 205-positive electrode post, 206-positive lower plastic. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments. The embodiments of the present invention include, but are not limited to, the following embodiments.

[0021] Example 1:

[0022] like Figure 2-3 As shown, the electrodeless top cover structure provided by this utility model includes: a light aluminum sheet body 100, and a negative electrode post structure of the light aluminum sheet body 100 and... Figure 1The top cover structure shown is the same, so it will not be described again here. This embodiment improves the positive electrode post connection structure of the aluminum sheet body 100. Specifically, an external boss 101 and two internal bosses 102 are respectively provided on the front and back sides of the positive electrode post position of the aluminum sheet body 100. The external boss 101 is provided on the front side of the aluminum sheet body 100 and is used to replace the positive electrode aluminum block 201 in the current top cover structure. It serves as the positive output terminal of the battery cell and is welded to the external palladium sheet (the positive end palladium sheet of the top cover). The internal bosses 102 are provided on the back side of the aluminum sheet body 100 and replace the positive electrode post 205 in the current top cover structure. They serve as the positive output terminal of the battery cell and are welded to the internal tab of the battery top cover. Since no through holes are provided on the aluminum sheet body 100, there is no need to provide the positive electrode plastic 202 and the sealing ring 204. In short, this structure eliminates the positive electrode aluminum block 201, positive electrode plastic 202, sealing ring 204, and positive electrode post 205 in the existing top cover structure, making the overall structure simpler, simplifying the positive electrode assembly process of the top cover, and reducing the impact of high welding temperatures on sealing performance, thus resulting in better stability. It is worth noting that the "no post" in this application refers to the absence of a positive electrode post (not the absence of a negative electrode post). Of course, it is also possible to further adopt the same design as the positive electrode post structure for the negative electrode post structure, and the corresponding lower plastic structure would also need to be modified accordingly (including but not limited to providing through holes to accommodate the internal connecting boss 102), which will not be elaborated here.

[0023] By setting an external boss 101 and an internal boss 102 on the front and back sides of the aluminum sheet body 100 respectively, the external boss 101 and the internal boss 102 are directly connected to the external palladium sheet and the internal electrode tab respectively, eliminating the need for the positive electrode aluminum block 201, the positive electrode plastic 202, the sealing ring 204 and the positive electrode post 205 structure, making the structure of the entire top cover simpler, reducing costs, facilitating assembly, and also improving the stability and reliability of the top cover to a certain extent.

[0024] Example 2:

[0025] like Figure 2-3 As shown, the outer boss 101 and the inner boss 102 are either square or circular in shape, depending on the top view during actual manufacturing. The outer boss 101 and the inner boss 102 can be designed as square or circular. However, from the perspective of material utilization and conductivity, a circular (cylindrical) structure offers better material utilization and is more suitable for assembly. The specific shape design should be combined with the specifications of the battery aluminum sheet body 100, which will not be elaborated here.

[0026] By setting external bosses 101 and internal bosses 102 of unlimited shape, the structure can be easily designed according to the actual needs of the battery.

[0027] Example 3:

[0028] The external boss 101 and the internal boss 102 are integrally stamped with the aluminum sheet body 100. During production, the aluminum sheet body 100 is stamped by a stamping machine, and the external boss 101 and the internal boss 102 are stamped at the positive pole position of the aluminum sheet body 100. Compared with the welding process, stamping is faster, more efficient and has fewer process steps, thus facilitating the improvement of production efficiency.

[0029] By setting the external boss 101 and internal boss 102 formed by stamping, the process can be simplified, production can be facilitated, and production efficiency can be improved.

[0030] Example 4:

[0031] like Figure 3 As shown, the external boss 101 is located between the two internal bosses 102, which makes the distance between the two symmetrically arranged internal bosses 102 relatively large, making the structure of the aluminum sheet body 100 more aesthetically pleasing, the deformation of the aluminum sheet body 100 more consistent, and less prone to twisting.

[0032] By setting the external boss 101 between the two internal bosses 102, the deformation of the aluminum sheet body 100 around the external boss 101 and the internal boss 102 is more uniform, less prone to twisting, and more aesthetically pleasing.

[0033] Working principle: An integrally formed external boss 101 and two internal bosses 102 are respectively set on the positive electrode post of the aluminum sheet body 100, replacing the traditional positive electrode aluminum block 201 and positive electrode post 205. This simplifies the cover plate structure, facilitates the assembly of the cover plate, and eliminates the need for the plastic 202 and sealing ring 204 on the positive electrode post. This makes the sealing performance of the cover plate at the positive electrode post less affected by the high temperature of welding during welding, and less prone to sealing problems. Therefore, it is more stable and reliable.

Claims

1. An endless post roof structure, characterized by Include: The light aluminum sheet body (100); Two sides of the light aluminum sheet body (100) are respectively provided with an outer tangent boss (101) and two inner tangent bosses (102); One side of the outer tangent boss (101) is welded with an outer palladium sheet; One side of the inner tangent boss (102) is welded with an internal tab.

2. A structure according to claim 1, wherein The outer tangent boss (101) is square or circular.

3. A structure according to claim 1, wherein The inner tangent boss (102) is square or circular.

4. A structure according to claim 1, wherein The outer tangent boss (101) and the light aluminum sheet body (100) are integrally stamped.

5. A structure according to claim 1, wherein The inner tangent boss (102) and the light aluminum sheet body (100) are integrally stamped.

6. A structure according to claim 1, wherein The outer tangent boss (101) is arranged between the two inner tangent bosses (102).

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