Battery cell pole structure

Abstract

The utility model discloses a battery cell pole structure, which comprises a pole and a terminal, the pole comprises a pole body, one end of the pole body is connected with a base, the other end of the pole body penetrates through a battery cell shell / cover plate in an insulating manner, a plurality of grooves are formed in the peripheral side of the pole body, and the terminal is arranged on the outer side of the battery cell shell / cover plate. The terminal is formed by splicing at least two terminal fragments, each terminal fragment is provided with at least one protruding block, and the protruding blocks are used in cooperation with the grooves. The utility model has the beneficial effects that the terminal is used for limiting the pole, the riveting action is not needed, the pole and the battery cell shell / cover plate are fixed by utilizing the mutual mortise and tenon joint of the convex block and the groove, the structure is simple, the assembly is convenient, and the cost is low.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a cell electrode structure. Background Technology

[0002] A battery cell is a fundamental component of a battery. It is typically an electrochemical device encapsulated in a metal casing, serving as the unit for storing and releasing electrical energy. A battery cell usually consists of a positive electrode, a negative electrode, a separator, and an electrolyte. The positive and negative electrodes are the two polar terminals of the cell. Currently, there are three main packaging methods for battery cells: cylindrical, prismatic, and pouch. Cylindrical and prismatic cells will have at least one terminal post, which serves as a polar terminal.

[0003] During the battery cell assembly process, the terminals, current collectors, and cores are usually welded first, then placed into the battery cell housing, and finally the terminals are fixed to the battery cell housing. Currently, the structure of the terminals of domestic battery cells is mostly riveted, that is, the terminals are riveted and the terminals are deformed by riveting to fix the terminals to the housing. This method not only requires the use of special riveting equipment, which increases costs, but also easily puts pressure on the housing or cover plate during the riveting process, causing the housing or cover plate to deform. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a battery cell terminal structure. The terminal is limited by the terminal, eliminating the need for riveting. The terminal is fixed to the battery cell housing / cover plate by the mortise and tenon joint of the protrusion and groove. The structure is simple, easy to assemble, and low in cost.

[0005] The purpose of this utility model is achieved through the following technical measures: a battery cell terminal structure, including a terminal and a post, the terminal including a column body, one end of the column body being connected to a base, the other end of the column body being insulated through the battery cell housing / cover plate and having multiple grooves on its periphery, the terminal being located on the outside of the battery cell housing / cover plate, the terminal being assembled from at least 2 terminal fragments, each terminal fragment having at least 1 protrusion, the protrusion being used in conjunction with the groove.

[0006] In some embodiments, a lower insulating pad is provided between the base and the cell housing / cover plate.

[0007] In some embodiments, a sealing ring is provided between the column and the cell housing / cover plate.

[0008] In some embodiments, an upper insulating pad is provided between the terminal and the cell housing / cover plate.

[0009] In some embodiments, when the protrusion mates with the groove, the post and the terminal are connected by welding.

[0010] Compared with the prior art, the advantages of this utility model are: this utility model limits the pole by using terminals, and the terminals and poles are fixed by tenon and mortise, eliminating the need for riveting. The terminals are divided into multiple splicing pieces, which facilitates the riveting of terminals and poles, making the operation convenient and the assembly cost low.

[0011] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the cell electrode structure in a square battery cell.

[0013] Figure 2 This is a cross-sectional schematic diagram of the battery cell electrode structure.

[0014] Figure 3 This is a schematic diagram of the terminal structure.

[0015] Figure 4 This is a schematic diagram of the pole structure.

[0016] Figure 5 This is a schematic diagram of the cell electrode structure in a cylindrical battery cell.

[0017] Among them, 1. cover plate, 2. terminal fragment, 3. column, 4. base, 5. upper insulating pad, 6. sealing ring, 7. lower insulating pad, 8. protrusion, 9. groove. Detailed Implementation

[0018] like Figures 1 to 5 As shown, a battery cell terminal structure includes a terminal and a post. The terminal includes a column 3, one end of which is connected to a base 4. During battery cell assembly, the base 4 is welded to a current collector. The other end of the column 3 is insulated through the battery cell housing / cover plate 1 and has multiple grooves 9 on its periphery. The terminal is located on the outside of the battery cell housing / cover plate 1 and is formed by splicing at least two terminal fragments 2. Each terminal fragment 2 has at least one protrusion 8, which cooperates with the grooves 9. Specifically, when fixing the terminal to the battery cell housing / cover plate 1, the column 3 of the terminal is extended outward through the battery cell housing / cover plate 1, the protrusion 8 of the terminal fragment 2 is inserted into the groove 9 on the column 3, and multiple terminal fragments 2 are spliced ​​together to form a terminal. The terminal limits the position of the terminal, thereby fixing the terminal to the battery cell housing / cover plate 1. This disclosure eliminates the need for riveting. It utilizes the mortise and tenon joints between the protrusions 8 and the grooves 9 to fix the pole to the battery cell housing / cover plate 1, making assembly convenient and cost-effective.

[0019] It should be noted that the cell casing is usually an open structure at one end, and the open end is usually sealed by the cover plate 1. The terminal end of the cell can be set on the cell casing or on the cover plate 1. The terminal structure disclosed herein can be applied to either end of the cell casing / cover plate 1, or both ends of the cell casing and the cover plate 1.

[0020] This disclosure does not specifically limit the shape of the terminals or the number of terminal fragments 2. The shape of the terminals can be set according to the actual situation; for example, cylindrical cells use round terminals, and square cells use square terminals. Of course, the number of terminal fragments 2 can also be set according to the actual situation, for example, such as... Figure 3 As shown, the terminal is divided into two terminal fragments 2, and the two terminal fragments 2 are spliced ​​together to form a square terminal.

[0021] In some embodiments, a lower insulating pad 7 is provided between the base 4 and the cell housing / cover plate 1, and the lower insulating pad 7 is used to achieve insulation between the pole base 4 and the cell housing / cover plate 1.

[0022] In some embodiments, a sealing ring 6 is provided between the post 3 and the cell housing / cover plate 1 to achieve insulation between the post 3 and the cell housing / cover plate 1.

[0023] In some embodiments, an upper insulating pad 5 is provided between the terminal and the cell housing / cover plate 1, and the upper insulating pad 5 is used to achieve insulation between the terminal and the cell housing / cover plate 1.

[0024] In some embodiments, when the protrusion 8 mates with the groove 9, the post 3 and the terminal are also connected by welding. After the terminal and the pole are assembled, laser welding can be performed between the terminal and the side wall of the pole post 3 to enhance the connection strength between the terminal and the pole.

[0025] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0027] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0028] In this utility model, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0029] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. A cell electrode structure, characterized in that: The device includes a pole and a terminal. The pole includes a column body, one end of which is connected to a base. The other end of the column body is insulated through the cell housing / cover plate and has multiple grooves on its periphery. The terminal is located on the outside of the cell housing / cover plate. The terminal is composed of at least two terminal fragments spliced ​​together. Each terminal fragment has at least one protrusion, which is used in conjunction with the grooves.

2. The cell electrode structure according to claim 1, characterized in that: A lower insulating pad is provided between the base and the cell housing / cover plate.

3. The cell electrode structure according to claim 1, characterized in that: A sealing ring is provided between the column and the cell housing / cover plate.

4. The cell electrode structure according to claim 1, characterized in that: An upper insulating pad is provided between the terminal and the cell housing / cover plate.

5. The cell electrode structure according to claim 1, characterized in that: When the protrusion mates with the groove, the column and the terminal are connected by welding.

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